View.java revision 4e7c562c43e9014c8fb3e75d02ba98fa4edadbde
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.AnimatorInflater; 20import android.animation.StateListAnimator; 21import android.annotation.IntDef; 22import android.annotation.NonNull; 23import android.annotation.Nullable; 24import android.content.ClipData; 25import android.content.Context; 26import android.content.res.ColorStateList; 27import android.content.res.Configuration; 28import android.content.res.Resources; 29import android.content.res.TypedArray; 30import android.graphics.Bitmap; 31import android.graphics.Canvas; 32import android.graphics.Insets; 33import android.graphics.Interpolator; 34import android.graphics.LinearGradient; 35import android.graphics.Matrix; 36import android.graphics.Outline; 37import android.graphics.Paint; 38import android.graphics.Path; 39import android.graphics.PathMeasure; 40import android.graphics.PixelFormat; 41import android.graphics.Point; 42import android.graphics.PorterDuff; 43import android.graphics.PorterDuffXfermode; 44import android.graphics.Rect; 45import android.graphics.RectF; 46import android.graphics.Region; 47import android.graphics.Shader; 48import android.graphics.drawable.ColorDrawable; 49import android.graphics.drawable.Drawable; 50import android.hardware.display.DisplayManagerGlobal; 51import android.os.Bundle; 52import android.os.Handler; 53import android.os.IBinder; 54import android.os.Parcel; 55import android.os.Parcelable; 56import android.os.RemoteException; 57import android.os.SystemClock; 58import android.os.SystemProperties; 59import android.text.TextUtils; 60import android.util.AttributeSet; 61import android.util.FloatProperty; 62import android.util.LayoutDirection; 63import android.util.Log; 64import android.util.LongSparseLongArray; 65import android.util.Pools.SynchronizedPool; 66import android.util.Property; 67import android.util.SparseArray; 68import android.util.SuperNotCalledException; 69import android.util.TypedValue; 70import android.view.ContextMenu.ContextMenuInfo; 71import android.view.AccessibilityIterators.TextSegmentIterator; 72import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 73import android.view.AccessibilityIterators.WordTextSegmentIterator; 74import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 75import android.view.accessibility.AccessibilityEvent; 76import android.view.accessibility.AccessibilityEventSource; 77import android.view.accessibility.AccessibilityManager; 78import android.view.accessibility.AccessibilityNodeInfo; 79import android.view.accessibility.AccessibilityNodeProvider; 80import android.view.animation.Animation; 81import android.view.animation.AnimationUtils; 82import android.view.animation.Transformation; 83import android.view.inputmethod.EditorInfo; 84import android.view.inputmethod.InputConnection; 85import android.view.inputmethod.InputMethodManager; 86import android.widget.ScrollBarDrawable; 87 88import static android.os.Build.VERSION_CODES.*; 89import static java.lang.Math.max; 90 91import com.android.internal.R; 92import com.android.internal.util.Predicate; 93import com.android.internal.view.menu.MenuBuilder; 94import com.google.android.collect.Lists; 95import com.google.android.collect.Maps; 96 97import java.lang.annotation.Retention; 98import java.lang.annotation.RetentionPolicy; 99import java.lang.ref.WeakReference; 100import java.lang.reflect.Field; 101import java.lang.reflect.InvocationTargetException; 102import java.lang.reflect.Method; 103import java.lang.reflect.Modifier; 104import java.util.ArrayList; 105import java.util.Arrays; 106import java.util.Collections; 107import java.util.HashMap; 108import java.util.List; 109import java.util.Locale; 110import java.util.Map; 111import java.util.concurrent.CopyOnWriteArrayList; 112import java.util.concurrent.atomic.AtomicInteger; 113 114/** 115 * <p> 116 * This class represents the basic building block for user interface components. A View 117 * occupies a rectangular area on the screen and is responsible for drawing and 118 * event handling. View is the base class for <em>widgets</em>, which are 119 * used to create interactive UI components (buttons, text fields, etc.). The 120 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 121 * are invisible containers that hold other Views (or other ViewGroups) and define 122 * their layout properties. 123 * </p> 124 * 125 * <div class="special reference"> 126 * <h3>Developer Guides</h3> 127 * <p>For information about using this class to develop your application's user interface, 128 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 129 * </div> 130 * 131 * <a name="Using"></a> 132 * <h3>Using Views</h3> 133 * <p> 134 * All of the views in a window are arranged in a single tree. You can add views 135 * either from code or by specifying a tree of views in one or more XML layout 136 * files. There are many specialized subclasses of views that act as controls or 137 * are capable of displaying text, images, or other content. 138 * </p> 139 * <p> 140 * Once you have created a tree of views, there are typically a few types of 141 * common operations you may wish to perform: 142 * <ul> 143 * <li><strong>Set properties:</strong> for example setting the text of a 144 * {@link android.widget.TextView}. The available properties and the methods 145 * that set them will vary among the different subclasses of views. Note that 146 * properties that are known at build time can be set in the XML layout 147 * files.</li> 148 * <li><strong>Set focus:</strong> The framework will handled moving focus in 149 * response to user input. To force focus to a specific view, call 150 * {@link #requestFocus}.</li> 151 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 152 * that will be notified when something interesting happens to the view. For 153 * example, all views will let you set a listener to be notified when the view 154 * gains or loses focus. You can register such a listener using 155 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 156 * Other view subclasses offer more specialized listeners. For example, a Button 157 * exposes a listener to notify clients when the button is clicked.</li> 158 * <li><strong>Set visibility:</strong> You can hide or show views using 159 * {@link #setVisibility(int)}.</li> 160 * </ul> 161 * </p> 162 * <p><em> 163 * Note: The Android framework is responsible for measuring, laying out and 164 * drawing views. You should not call methods that perform these actions on 165 * views yourself unless you are actually implementing a 166 * {@link android.view.ViewGroup}. 167 * </em></p> 168 * 169 * <a name="Lifecycle"></a> 170 * <h3>Implementing a Custom View</h3> 171 * 172 * <p> 173 * To implement a custom view, you will usually begin by providing overrides for 174 * some of the standard methods that the framework calls on all views. You do 175 * not need to override all of these methods. In fact, you can start by just 176 * overriding {@link #onDraw(android.graphics.Canvas)}. 177 * <table border="2" width="85%" align="center" cellpadding="5"> 178 * <thead> 179 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 180 * </thead> 181 * 182 * <tbody> 183 * <tr> 184 * <td rowspan="2">Creation</td> 185 * <td>Constructors</td> 186 * <td>There is a form of the constructor that are called when the view 187 * is created from code and a form that is called when the view is 188 * inflated from a layout file. The second form should parse and apply 189 * any attributes defined in the layout file. 190 * </td> 191 * </tr> 192 * <tr> 193 * <td><code>{@link #onFinishInflate()}</code></td> 194 * <td>Called after a view and all of its children has been inflated 195 * from XML.</td> 196 * </tr> 197 * 198 * <tr> 199 * <td rowspan="3">Layout</td> 200 * <td><code>{@link #onMeasure(int, int)}</code></td> 201 * <td>Called to determine the size requirements for this view and all 202 * of its children. 203 * </td> 204 * </tr> 205 * <tr> 206 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 207 * <td>Called when this view should assign a size and position to all 208 * of its children. 209 * </td> 210 * </tr> 211 * <tr> 212 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 213 * <td>Called when the size of this view has changed. 214 * </td> 215 * </tr> 216 * 217 * <tr> 218 * <td>Drawing</td> 219 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 220 * <td>Called when the view should render its content. 221 * </td> 222 * </tr> 223 * 224 * <tr> 225 * <td rowspan="4">Event processing</td> 226 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 227 * <td>Called when a new hardware key event occurs. 228 * </td> 229 * </tr> 230 * <tr> 231 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 232 * <td>Called when a hardware key up event occurs. 233 * </td> 234 * </tr> 235 * <tr> 236 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 237 * <td>Called when a trackball motion event occurs. 238 * </td> 239 * </tr> 240 * <tr> 241 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 242 * <td>Called when a touch screen motion event occurs. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td rowspan="2">Focus</td> 248 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 249 * <td>Called when the view gains or loses focus. 250 * </td> 251 * </tr> 252 * 253 * <tr> 254 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 255 * <td>Called when the window containing the view gains or loses focus. 256 * </td> 257 * </tr> 258 * 259 * <tr> 260 * <td rowspan="3">Attaching</td> 261 * <td><code>{@link #onAttachedToWindow()}</code></td> 262 * <td>Called when the view is attached to a window. 263 * </td> 264 * </tr> 265 * 266 * <tr> 267 * <td><code>{@link #onDetachedFromWindow}</code></td> 268 * <td>Called when the view is detached from its window. 269 * </td> 270 * </tr> 271 * 272 * <tr> 273 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 274 * <td>Called when the visibility of the window containing the view 275 * has changed. 276 * </td> 277 * </tr> 278 * </tbody> 279 * 280 * </table> 281 * </p> 282 * 283 * <a name="IDs"></a> 284 * <h3>IDs</h3> 285 * Views may have an integer id associated with them. These ids are typically 286 * assigned in the layout XML files, and are used to find specific views within 287 * the view tree. A common pattern is to: 288 * <ul> 289 * <li>Define a Button in the layout file and assign it a unique ID. 290 * <pre> 291 * <Button 292 * android:id="@+id/my_button" 293 * android:layout_width="wrap_content" 294 * android:layout_height="wrap_content" 295 * android:text="@string/my_button_text"/> 296 * </pre></li> 297 * <li>From the onCreate method of an Activity, find the Button 298 * <pre class="prettyprint"> 299 * Button myButton = (Button) findViewById(R.id.my_button); 300 * </pre></li> 301 * </ul> 302 * <p> 303 * View IDs need not be unique throughout the tree, but it is good practice to 304 * ensure that they are at least unique within the part of the tree you are 305 * searching. 306 * </p> 307 * 308 * <a name="Position"></a> 309 * <h3>Position</h3> 310 * <p> 311 * The geometry of a view is that of a rectangle. A view has a location, 312 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 313 * two dimensions, expressed as a width and a height. The unit for location 314 * and dimensions is the pixel. 315 * </p> 316 * 317 * <p> 318 * It is possible to retrieve the location of a view by invoking the methods 319 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 320 * coordinate of the rectangle representing the view. The latter returns the 321 * top, or Y, coordinate of the rectangle representing the view. These methods 322 * both return the location of the view relative to its parent. For instance, 323 * when getLeft() returns 20, that means the view is located 20 pixels to the 324 * right of the left edge of its direct parent. 325 * </p> 326 * 327 * <p> 328 * In addition, several convenience methods are offered to avoid unnecessary 329 * computations, namely {@link #getRight()} and {@link #getBottom()}. 330 * These methods return the coordinates of the right and bottom edges of the 331 * rectangle representing the view. For instance, calling {@link #getRight()} 332 * is similar to the following computation: <code>getLeft() + getWidth()</code> 333 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 334 * </p> 335 * 336 * <a name="SizePaddingMargins"></a> 337 * <h3>Size, padding and margins</h3> 338 * <p> 339 * The size of a view is expressed with a width and a height. A view actually 340 * possess two pairs of width and height values. 341 * </p> 342 * 343 * <p> 344 * The first pair is known as <em>measured width</em> and 345 * <em>measured height</em>. These dimensions define how big a view wants to be 346 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 347 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 348 * and {@link #getMeasuredHeight()}. 349 * </p> 350 * 351 * <p> 352 * The second pair is simply known as <em>width</em> and <em>height</em>, or 353 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 354 * dimensions define the actual size of the view on screen, at drawing time and 355 * after layout. These values may, but do not have to, be different from the 356 * measured width and height. The width and height can be obtained by calling 357 * {@link #getWidth()} and {@link #getHeight()}. 358 * </p> 359 * 360 * <p> 361 * To measure its dimensions, a view takes into account its padding. The padding 362 * is expressed in pixels for the left, top, right and bottom parts of the view. 363 * Padding can be used to offset the content of the view by a specific amount of 364 * pixels. For instance, a left padding of 2 will push the view's content by 365 * 2 pixels to the right of the left edge. Padding can be set using the 366 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 367 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 368 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 369 * {@link #getPaddingEnd()}. 370 * </p> 371 * 372 * <p> 373 * Even though a view can define a padding, it does not provide any support for 374 * margins. However, view groups provide such a support. Refer to 375 * {@link android.view.ViewGroup} and 376 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 377 * </p> 378 * 379 * <a name="Layout"></a> 380 * <h3>Layout</h3> 381 * <p> 382 * Layout is a two pass process: a measure pass and a layout pass. The measuring 383 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 384 * of the view tree. Each view pushes dimension specifications down the tree 385 * during the recursion. At the end of the measure pass, every view has stored 386 * its measurements. The second pass happens in 387 * {@link #layout(int,int,int,int)} and is also top-down. During 388 * this pass each parent is responsible for positioning all of its children 389 * using the sizes computed in the measure pass. 390 * </p> 391 * 392 * <p> 393 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 394 * {@link #getMeasuredHeight()} values must be set, along with those for all of 395 * that view's descendants. A view's measured width and measured height values 396 * must respect the constraints imposed by the view's parents. This guarantees 397 * that at the end of the measure pass, all parents accept all of their 398 * children's measurements. A parent view may call measure() more than once on 399 * its children. For example, the parent may measure each child once with 400 * unspecified dimensions to find out how big they want to be, then call 401 * measure() on them again with actual numbers if the sum of all the children's 402 * unconstrained sizes is too big or too small. 403 * </p> 404 * 405 * <p> 406 * The measure pass uses two classes to communicate dimensions. The 407 * {@link MeasureSpec} class is used by views to tell their parents how they 408 * want to be measured and positioned. The base LayoutParams class just 409 * describes how big the view wants to be for both width and height. For each 410 * dimension, it can specify one of: 411 * <ul> 412 * <li> an exact number 413 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 414 * (minus padding) 415 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 416 * enclose its content (plus padding). 417 * </ul> 418 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 419 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 420 * an X and Y value. 421 * </p> 422 * 423 * <p> 424 * MeasureSpecs are used to push requirements down the tree from parent to 425 * child. A MeasureSpec can be in one of three modes: 426 * <ul> 427 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 428 * of a child view. For example, a LinearLayout may call measure() on its child 429 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 430 * tall the child view wants to be given a width of 240 pixels. 431 * <li>EXACTLY: This is used by the parent to impose an exact size on the 432 * child. The child must use this size, and guarantee that all of its 433 * descendants will fit within this size. 434 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 435 * child. The child must guarantee that it and all of its descendants will fit 436 * within this size. 437 * </ul> 438 * </p> 439 * 440 * <p> 441 * To intiate a layout, call {@link #requestLayout}. This method is typically 442 * called by a view on itself when it believes that is can no longer fit within 443 * its current bounds. 444 * </p> 445 * 446 * <a name="Drawing"></a> 447 * <h3>Drawing</h3> 448 * <p> 449 * Drawing is handled by walking the tree and recording the drawing commands of 450 * any View that needs to update. After this, the drawing commands of the 451 * entire tree are issued to screen, clipped to the newly damaged area. 452 * </p> 453 * 454 * <p> 455 * The tree is largely recorded and drawn in order, with parents drawn before 456 * (i.e., behind) their children, with siblings drawn in the order they appear 457 * in the tree. If you set a background drawable for a View, then the View will 458 * draw it before calling back to its <code>onDraw()</code> method. The child 459 * drawing order can be overridden with 460 * {@link ViewGroup#setChildrenDrawingOrderEnabled(boolean) custom child drawing order} 461 * in a ViewGroup, and with {@link #setZ(float)} custom Z values} set on Views. 462 * </p> 463 * 464 * <p> 465 * To force a view to draw, call {@link #invalidate()}. 466 * </p> 467 * 468 * <a name="EventHandlingThreading"></a> 469 * <h3>Event Handling and Threading</h3> 470 * <p> 471 * The basic cycle of a view is as follows: 472 * <ol> 473 * <li>An event comes in and is dispatched to the appropriate view. The view 474 * handles the event and notifies any listeners.</li> 475 * <li>If in the course of processing the event, the view's bounds may need 476 * to be changed, the view will call {@link #requestLayout()}.</li> 477 * <li>Similarly, if in the course of processing the event the view's appearance 478 * may need to be changed, the view will call {@link #invalidate()}.</li> 479 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 480 * the framework will take care of measuring, laying out, and drawing the tree 481 * as appropriate.</li> 482 * </ol> 483 * </p> 484 * 485 * <p><em>Note: The entire view tree is single threaded. You must always be on 486 * the UI thread when calling any method on any view.</em> 487 * If you are doing work on other threads and want to update the state of a view 488 * from that thread, you should use a {@link Handler}. 489 * </p> 490 * 491 * <a name="FocusHandling"></a> 492 * <h3>Focus Handling</h3> 493 * <p> 494 * The framework will handle routine focus movement in response to user input. 495 * This includes changing the focus as views are removed or hidden, or as new 496 * views become available. Views indicate their willingness to take focus 497 * through the {@link #isFocusable} method. To change whether a view can take 498 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 499 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 500 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 501 * </p> 502 * <p> 503 * Focus movement is based on an algorithm which finds the nearest neighbor in a 504 * given direction. In rare cases, the default algorithm may not match the 505 * intended behavior of the developer. In these situations, you can provide 506 * explicit overrides by using these XML attributes in the layout file: 507 * <pre> 508 * nextFocusDown 509 * nextFocusLeft 510 * nextFocusRight 511 * nextFocusUp 512 * </pre> 513 * </p> 514 * 515 * 516 * <p> 517 * To get a particular view to take focus, call {@link #requestFocus()}. 518 * </p> 519 * 520 * <a name="TouchMode"></a> 521 * <h3>Touch Mode</h3> 522 * <p> 523 * When a user is navigating a user interface via directional keys such as a D-pad, it is 524 * necessary to give focus to actionable items such as buttons so the user can see 525 * what will take input. If the device has touch capabilities, however, and the user 526 * begins interacting with the interface by touching it, it is no longer necessary to 527 * always highlight, or give focus to, a particular view. This motivates a mode 528 * for interaction named 'touch mode'. 529 * </p> 530 * <p> 531 * For a touch capable device, once the user touches the screen, the device 532 * will enter touch mode. From this point onward, only views for which 533 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 534 * Other views that are touchable, like buttons, will not take focus when touched; they will 535 * only fire the on click listeners. 536 * </p> 537 * <p> 538 * Any time a user hits a directional key, such as a D-pad direction, the view device will 539 * exit touch mode, and find a view to take focus, so that the user may resume interacting 540 * with the user interface without touching the screen again. 541 * </p> 542 * <p> 543 * The touch mode state is maintained across {@link android.app.Activity}s. Call 544 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 545 * </p> 546 * 547 * <a name="Scrolling"></a> 548 * <h3>Scrolling</h3> 549 * <p> 550 * The framework provides basic support for views that wish to internally 551 * scroll their content. This includes keeping track of the X and Y scroll 552 * offset as well as mechanisms for drawing scrollbars. See 553 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 554 * {@link #awakenScrollBars()} for more details. 555 * </p> 556 * 557 * <a name="Tags"></a> 558 * <h3>Tags</h3> 559 * <p> 560 * Unlike IDs, tags are not used to identify views. Tags are essentially an 561 * extra piece of information that can be associated with a view. They are most 562 * often used as a convenience to store data related to views in the views 563 * themselves rather than by putting them in a separate structure. 564 * </p> 565 * 566 * <a name="Properties"></a> 567 * <h3>Properties</h3> 568 * <p> 569 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 570 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 571 * available both in the {@link Property} form as well as in similarly-named setter/getter 572 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 573 * be used to set persistent state associated with these rendering-related properties on the view. 574 * The properties and methods can also be used in conjunction with 575 * {@link android.animation.Animator Animator}-based animations, described more in the 576 * <a href="#Animation">Animation</a> section. 577 * </p> 578 * 579 * <a name="Animation"></a> 580 * <h3>Animation</h3> 581 * <p> 582 * Starting with Android 3.0, the preferred way of animating views is to use the 583 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 584 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 585 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 586 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 587 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 588 * makes animating these View properties particularly easy and efficient. 589 * </p> 590 * <p> 591 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 592 * You can attach an {@link Animation} object to a view using 593 * {@link #setAnimation(Animation)} or 594 * {@link #startAnimation(Animation)}. The animation can alter the scale, 595 * rotation, translation and alpha of a view over time. If the animation is 596 * attached to a view that has children, the animation will affect the entire 597 * subtree rooted by that node. When an animation is started, the framework will 598 * take care of redrawing the appropriate views until the animation completes. 599 * </p> 600 * 601 * <a name="Security"></a> 602 * <h3>Security</h3> 603 * <p> 604 * Sometimes it is essential that an application be able to verify that an action 605 * is being performed with the full knowledge and consent of the user, such as 606 * granting a permission request, making a purchase or clicking on an advertisement. 607 * Unfortunately, a malicious application could try to spoof the user into 608 * performing these actions, unaware, by concealing the intended purpose of the view. 609 * As a remedy, the framework offers a touch filtering mechanism that can be used to 610 * improve the security of views that provide access to sensitive functionality. 611 * </p><p> 612 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 613 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 614 * will discard touches that are received whenever the view's window is obscured by 615 * another visible window. As a result, the view will not receive touches whenever a 616 * toast, dialog or other window appears above the view's window. 617 * </p><p> 618 * For more fine-grained control over security, consider overriding the 619 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 620 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 621 * </p> 622 * 623 * @attr ref android.R.styleable#View_alpha 624 * @attr ref android.R.styleable#View_background 625 * @attr ref android.R.styleable#View_clickable 626 * @attr ref android.R.styleable#View_contentDescription 627 * @attr ref android.R.styleable#View_drawingCacheQuality 628 * @attr ref android.R.styleable#View_duplicateParentState 629 * @attr ref android.R.styleable#View_id 630 * @attr ref android.R.styleable#View_requiresFadingEdge 631 * @attr ref android.R.styleable#View_fadeScrollbars 632 * @attr ref android.R.styleable#View_fadingEdgeLength 633 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 634 * @attr ref android.R.styleable#View_fitsSystemWindows 635 * @attr ref android.R.styleable#View_isScrollContainer 636 * @attr ref android.R.styleable#View_focusable 637 * @attr ref android.R.styleable#View_focusableInTouchMode 638 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 639 * @attr ref android.R.styleable#View_keepScreenOn 640 * @attr ref android.R.styleable#View_layerType 641 * @attr ref android.R.styleable#View_layoutDirection 642 * @attr ref android.R.styleable#View_longClickable 643 * @attr ref android.R.styleable#View_minHeight 644 * @attr ref android.R.styleable#View_minWidth 645 * @attr ref android.R.styleable#View_nextFocusDown 646 * @attr ref android.R.styleable#View_nextFocusLeft 647 * @attr ref android.R.styleable#View_nextFocusRight 648 * @attr ref android.R.styleable#View_nextFocusUp 649 * @attr ref android.R.styleable#View_onClick 650 * @attr ref android.R.styleable#View_padding 651 * @attr ref android.R.styleable#View_paddingBottom 652 * @attr ref android.R.styleable#View_paddingLeft 653 * @attr ref android.R.styleable#View_paddingRight 654 * @attr ref android.R.styleable#View_paddingTop 655 * @attr ref android.R.styleable#View_paddingStart 656 * @attr ref android.R.styleable#View_paddingEnd 657 * @attr ref android.R.styleable#View_saveEnabled 658 * @attr ref android.R.styleable#View_rotation 659 * @attr ref android.R.styleable#View_rotationX 660 * @attr ref android.R.styleable#View_rotationY 661 * @attr ref android.R.styleable#View_scaleX 662 * @attr ref android.R.styleable#View_scaleY 663 * @attr ref android.R.styleable#View_scrollX 664 * @attr ref android.R.styleable#View_scrollY 665 * @attr ref android.R.styleable#View_scrollbarSize 666 * @attr ref android.R.styleable#View_scrollbarStyle 667 * @attr ref android.R.styleable#View_scrollbars 668 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 669 * @attr ref android.R.styleable#View_scrollbarFadeDuration 670 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 671 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 672 * @attr ref android.R.styleable#View_scrollbarThumbVertical 673 * @attr ref android.R.styleable#View_scrollbarTrackVertical 674 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 675 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 676 * @attr ref android.R.styleable#View_stateListAnimator 677 * @attr ref android.R.styleable#View_transitionName 678 * @attr ref android.R.styleable#View_soundEffectsEnabled 679 * @attr ref android.R.styleable#View_tag 680 * @attr ref android.R.styleable#View_textAlignment 681 * @attr ref android.R.styleable#View_textDirection 682 * @attr ref android.R.styleable#View_transformPivotX 683 * @attr ref android.R.styleable#View_transformPivotY 684 * @attr ref android.R.styleable#View_translationX 685 * @attr ref android.R.styleable#View_translationY 686 * @attr ref android.R.styleable#View_translationZ 687 * @attr ref android.R.styleable#View_visibility 688 * 689 * @see android.view.ViewGroup 690 */ 691public class View implements Drawable.Callback, KeyEvent.Callback, 692 AccessibilityEventSource { 693 private static final boolean DBG = false; 694 695 /** 696 * The logging tag used by this class with android.util.Log. 697 */ 698 protected static final String VIEW_LOG_TAG = "View"; 699 700 /** 701 * When set to true, apps will draw debugging information about their layouts. 702 * 703 * @hide 704 */ 705 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 706 707 /** 708 * When set to true, this view will save its attribute data. 709 * 710 * @hide 711 */ 712 public static boolean mDebugViewAttributes = false; 713 714 /** 715 * Used to mark a View that has no ID. 716 */ 717 public static final int NO_ID = -1; 718 719 /** 720 * Signals that compatibility booleans have been initialized according to 721 * target SDK versions. 722 */ 723 private static boolean sCompatibilityDone = false; 724 725 /** 726 * Use the old (broken) way of building MeasureSpecs. 727 */ 728 private static boolean sUseBrokenMakeMeasureSpec = false; 729 730 /** 731 * Ignore any optimizations using the measure cache. 732 */ 733 private static boolean sIgnoreMeasureCache = false; 734 735 /** 736 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 737 * calling setFlags. 738 */ 739 private static final int NOT_FOCUSABLE = 0x00000000; 740 741 /** 742 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 743 * setFlags. 744 */ 745 private static final int FOCUSABLE = 0x00000001; 746 747 /** 748 * Mask for use with setFlags indicating bits used for focus. 749 */ 750 private static final int FOCUSABLE_MASK = 0x00000001; 751 752 /** 753 * This view will adjust its padding to fit sytem windows (e.g. status bar) 754 */ 755 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 756 757 /** @hide */ 758 @IntDef({VISIBLE, INVISIBLE, GONE}) 759 @Retention(RetentionPolicy.SOURCE) 760 public @interface Visibility {} 761 762 /** 763 * This view is visible. 764 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 765 * android:visibility}. 766 */ 767 public static final int VISIBLE = 0x00000000; 768 769 /** 770 * This view is invisible, but it still takes up space for layout purposes. 771 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 772 * android:visibility}. 773 */ 774 public static final int INVISIBLE = 0x00000004; 775 776 /** 777 * This view is invisible, and it doesn't take any space for layout 778 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 779 * android:visibility}. 780 */ 781 public static final int GONE = 0x00000008; 782 783 /** 784 * Mask for use with setFlags indicating bits used for visibility. 785 * {@hide} 786 */ 787 static final int VISIBILITY_MASK = 0x0000000C; 788 789 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 790 791 /** 792 * This view is enabled. Interpretation varies by subclass. 793 * Use with ENABLED_MASK when calling setFlags. 794 * {@hide} 795 */ 796 static final int ENABLED = 0x00000000; 797 798 /** 799 * This view is disabled. Interpretation varies by subclass. 800 * Use with ENABLED_MASK when calling setFlags. 801 * {@hide} 802 */ 803 static final int DISABLED = 0x00000020; 804 805 /** 806 * Mask for use with setFlags indicating bits used for indicating whether 807 * this view is enabled 808 * {@hide} 809 */ 810 static final int ENABLED_MASK = 0x00000020; 811 812 /** 813 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 814 * called and further optimizations will be performed. It is okay to have 815 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 816 * {@hide} 817 */ 818 static final int WILL_NOT_DRAW = 0x00000080; 819 820 /** 821 * Mask for use with setFlags indicating bits used for indicating whether 822 * this view is will draw 823 * {@hide} 824 */ 825 static final int DRAW_MASK = 0x00000080; 826 827 /** 828 * <p>This view doesn't show scrollbars.</p> 829 * {@hide} 830 */ 831 static final int SCROLLBARS_NONE = 0x00000000; 832 833 /** 834 * <p>This view shows horizontal scrollbars.</p> 835 * {@hide} 836 */ 837 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 838 839 /** 840 * <p>This view shows vertical scrollbars.</p> 841 * {@hide} 842 */ 843 static final int SCROLLBARS_VERTICAL = 0x00000200; 844 845 /** 846 * <p>Mask for use with setFlags indicating bits used for indicating which 847 * scrollbars are enabled.</p> 848 * {@hide} 849 */ 850 static final int SCROLLBARS_MASK = 0x00000300; 851 852 /** 853 * Indicates that the view should filter touches when its window is obscured. 854 * Refer to the class comments for more information about this security feature. 855 * {@hide} 856 */ 857 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 858 859 /** 860 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 861 * that they are optional and should be skipped if the window has 862 * requested system UI flags that ignore those insets for layout. 863 */ 864 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 865 866 /** 867 * <p>This view doesn't show fading edges.</p> 868 * {@hide} 869 */ 870 static final int FADING_EDGE_NONE = 0x00000000; 871 872 /** 873 * <p>This view shows horizontal fading edges.</p> 874 * {@hide} 875 */ 876 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 877 878 /** 879 * <p>This view shows vertical fading edges.</p> 880 * {@hide} 881 */ 882 static final int FADING_EDGE_VERTICAL = 0x00002000; 883 884 /** 885 * <p>Mask for use with setFlags indicating bits used for indicating which 886 * fading edges are enabled.</p> 887 * {@hide} 888 */ 889 static final int FADING_EDGE_MASK = 0x00003000; 890 891 /** 892 * <p>Indicates this view can be clicked. When clickable, a View reacts 893 * to clicks by notifying the OnClickListener.<p> 894 * {@hide} 895 */ 896 static final int CLICKABLE = 0x00004000; 897 898 /** 899 * <p>Indicates this view is caching its drawing into a bitmap.</p> 900 * {@hide} 901 */ 902 static final int DRAWING_CACHE_ENABLED = 0x00008000; 903 904 /** 905 * <p>Indicates that no icicle should be saved for this view.<p> 906 * {@hide} 907 */ 908 static final int SAVE_DISABLED = 0x000010000; 909 910 /** 911 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 912 * property.</p> 913 * {@hide} 914 */ 915 static final int SAVE_DISABLED_MASK = 0x000010000; 916 917 /** 918 * <p>Indicates that no drawing cache should ever be created for this view.<p> 919 * {@hide} 920 */ 921 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 922 923 /** 924 * <p>Indicates this view can take / keep focus when int touch mode.</p> 925 * {@hide} 926 */ 927 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 928 929 /** @hide */ 930 @Retention(RetentionPolicy.SOURCE) 931 @IntDef({DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH, DRAWING_CACHE_QUALITY_AUTO}) 932 public @interface DrawingCacheQuality {} 933 934 /** 935 * <p>Enables low quality mode for the drawing cache.</p> 936 */ 937 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 938 939 /** 940 * <p>Enables high quality mode for the drawing cache.</p> 941 */ 942 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 943 944 /** 945 * <p>Enables automatic quality mode for the drawing cache.</p> 946 */ 947 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 948 949 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 950 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 951 }; 952 953 /** 954 * <p>Mask for use with setFlags indicating bits used for the cache 955 * quality property.</p> 956 * {@hide} 957 */ 958 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 959 960 /** 961 * <p> 962 * Indicates this view can be long clicked. When long clickable, a View 963 * reacts to long clicks by notifying the OnLongClickListener or showing a 964 * context menu. 965 * </p> 966 * {@hide} 967 */ 968 static final int LONG_CLICKABLE = 0x00200000; 969 970 /** 971 * <p>Indicates that this view gets its drawable states from its direct parent 972 * and ignores its original internal states.</p> 973 * 974 * @hide 975 */ 976 static final int DUPLICATE_PARENT_STATE = 0x00400000; 977 978 /** @hide */ 979 @IntDef({ 980 SCROLLBARS_INSIDE_OVERLAY, 981 SCROLLBARS_INSIDE_INSET, 982 SCROLLBARS_OUTSIDE_OVERLAY, 983 SCROLLBARS_OUTSIDE_INSET 984 }) 985 @Retention(RetentionPolicy.SOURCE) 986 public @interface ScrollBarStyle {} 987 988 /** 989 * The scrollbar style to display the scrollbars inside the content area, 990 * without increasing the padding. The scrollbars will be overlaid with 991 * translucency on the view's content. 992 */ 993 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 994 995 /** 996 * The scrollbar style to display the scrollbars inside the padded area, 997 * increasing the padding of the view. The scrollbars will not overlap the 998 * content area of the view. 999 */ 1000 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 1001 1002 /** 1003 * The scrollbar style to display the scrollbars at the edge of the view, 1004 * without increasing the padding. The scrollbars will be overlaid with 1005 * translucency. 1006 */ 1007 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 1008 1009 /** 1010 * The scrollbar style to display the scrollbars at the edge of the view, 1011 * increasing the padding of the view. The scrollbars will only overlap the 1012 * background, if any. 1013 */ 1014 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 1015 1016 /** 1017 * Mask to check if the scrollbar style is overlay or inset. 1018 * {@hide} 1019 */ 1020 static final int SCROLLBARS_INSET_MASK = 0x01000000; 1021 1022 /** 1023 * Mask to check if the scrollbar style is inside or outside. 1024 * {@hide} 1025 */ 1026 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 1027 1028 /** 1029 * Mask for scrollbar style. 1030 * {@hide} 1031 */ 1032 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 1033 1034 /** 1035 * View flag indicating that the screen should remain on while the 1036 * window containing this view is visible to the user. This effectively 1037 * takes care of automatically setting the WindowManager's 1038 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 1039 */ 1040 public static final int KEEP_SCREEN_ON = 0x04000000; 1041 1042 /** 1043 * View flag indicating whether this view should have sound effects enabled 1044 * for events such as clicking and touching. 1045 */ 1046 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 1047 1048 /** 1049 * View flag indicating whether this view should have haptic feedback 1050 * enabled for events such as long presses. 1051 */ 1052 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 1053 1054 /** 1055 * <p>Indicates that the view hierarchy should stop saving state when 1056 * it reaches this view. If state saving is initiated immediately at 1057 * the view, it will be allowed. 1058 * {@hide} 1059 */ 1060 static final int PARENT_SAVE_DISABLED = 0x20000000; 1061 1062 /** 1063 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 1064 * {@hide} 1065 */ 1066 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 1067 1068 /** @hide */ 1069 @IntDef(flag = true, 1070 value = { 1071 FOCUSABLES_ALL, 1072 FOCUSABLES_TOUCH_MODE 1073 }) 1074 @Retention(RetentionPolicy.SOURCE) 1075 public @interface FocusableMode {} 1076 1077 /** 1078 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1079 * should add all focusable Views regardless if they are focusable in touch mode. 1080 */ 1081 public static final int FOCUSABLES_ALL = 0x00000000; 1082 1083 /** 1084 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1085 * should add only Views focusable in touch mode. 1086 */ 1087 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1088 1089 /** @hide */ 1090 @IntDef({ 1091 FOCUS_BACKWARD, 1092 FOCUS_FORWARD, 1093 FOCUS_LEFT, 1094 FOCUS_UP, 1095 FOCUS_RIGHT, 1096 FOCUS_DOWN 1097 }) 1098 @Retention(RetentionPolicy.SOURCE) 1099 public @interface FocusDirection {} 1100 1101 /** @hide */ 1102 @IntDef({ 1103 FOCUS_LEFT, 1104 FOCUS_UP, 1105 FOCUS_RIGHT, 1106 FOCUS_DOWN 1107 }) 1108 @Retention(RetentionPolicy.SOURCE) 1109 public @interface FocusRealDirection {} // Like @FocusDirection, but without forward/backward 1110 1111 /** 1112 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1113 * item. 1114 */ 1115 public static final int FOCUS_BACKWARD = 0x00000001; 1116 1117 /** 1118 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1119 * item. 1120 */ 1121 public static final int FOCUS_FORWARD = 0x00000002; 1122 1123 /** 1124 * Use with {@link #focusSearch(int)}. Move focus to the left. 1125 */ 1126 public static final int FOCUS_LEFT = 0x00000011; 1127 1128 /** 1129 * Use with {@link #focusSearch(int)}. Move focus up. 1130 */ 1131 public static final int FOCUS_UP = 0x00000021; 1132 1133 /** 1134 * Use with {@link #focusSearch(int)}. Move focus to the right. 1135 */ 1136 public static final int FOCUS_RIGHT = 0x00000042; 1137 1138 /** 1139 * Use with {@link #focusSearch(int)}. Move focus down. 1140 */ 1141 public static final int FOCUS_DOWN = 0x00000082; 1142 1143 /** 1144 * Bits of {@link #getMeasuredWidthAndState()} and 1145 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1146 */ 1147 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1148 1149 /** 1150 * Bits of {@link #getMeasuredWidthAndState()} and 1151 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1152 */ 1153 public static final int MEASURED_STATE_MASK = 0xff000000; 1154 1155 /** 1156 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1157 * for functions that combine both width and height into a single int, 1158 * such as {@link #getMeasuredState()} and the childState argument of 1159 * {@link #resolveSizeAndState(int, int, int)}. 1160 */ 1161 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1162 1163 /** 1164 * Bit of {@link #getMeasuredWidthAndState()} and 1165 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1166 * is smaller that the space the view would like to have. 1167 */ 1168 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1169 1170 /** 1171 * Base View state sets 1172 */ 1173 // Singles 1174 /** 1175 * Indicates the view has no states set. States are used with 1176 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1177 * view depending on its state. 1178 * 1179 * @see android.graphics.drawable.Drawable 1180 * @see #getDrawableState() 1181 */ 1182 protected static final int[] EMPTY_STATE_SET; 1183 /** 1184 * Indicates the view is enabled. States are used with 1185 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1186 * view depending on its state. 1187 * 1188 * @see android.graphics.drawable.Drawable 1189 * @see #getDrawableState() 1190 */ 1191 protected static final int[] ENABLED_STATE_SET; 1192 /** 1193 * Indicates the view is focused. States are used with 1194 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1195 * view depending on its state. 1196 * 1197 * @see android.graphics.drawable.Drawable 1198 * @see #getDrawableState() 1199 */ 1200 protected static final int[] FOCUSED_STATE_SET; 1201 /** 1202 * Indicates the view is selected. States are used with 1203 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1204 * view depending on its state. 1205 * 1206 * @see android.graphics.drawable.Drawable 1207 * @see #getDrawableState() 1208 */ 1209 protected static final int[] SELECTED_STATE_SET; 1210 /** 1211 * Indicates the view is pressed. States are used with 1212 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1213 * view depending on its state. 1214 * 1215 * @see android.graphics.drawable.Drawable 1216 * @see #getDrawableState() 1217 */ 1218 protected static final int[] PRESSED_STATE_SET; 1219 /** 1220 * Indicates the view's window has focus. States are used with 1221 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1222 * view depending on its state. 1223 * 1224 * @see android.graphics.drawable.Drawable 1225 * @see #getDrawableState() 1226 */ 1227 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1228 // Doubles 1229 /** 1230 * Indicates the view is enabled and has the focus. 1231 * 1232 * @see #ENABLED_STATE_SET 1233 * @see #FOCUSED_STATE_SET 1234 */ 1235 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1236 /** 1237 * Indicates the view is enabled and selected. 1238 * 1239 * @see #ENABLED_STATE_SET 1240 * @see #SELECTED_STATE_SET 1241 */ 1242 protected static final int[] ENABLED_SELECTED_STATE_SET; 1243 /** 1244 * Indicates the view is enabled and that its window has focus. 1245 * 1246 * @see #ENABLED_STATE_SET 1247 * @see #WINDOW_FOCUSED_STATE_SET 1248 */ 1249 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1250 /** 1251 * Indicates the view is focused and selected. 1252 * 1253 * @see #FOCUSED_STATE_SET 1254 * @see #SELECTED_STATE_SET 1255 */ 1256 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1257 /** 1258 * Indicates the view has the focus and that its window has the focus. 1259 * 1260 * @see #FOCUSED_STATE_SET 1261 * @see #WINDOW_FOCUSED_STATE_SET 1262 */ 1263 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1264 /** 1265 * Indicates the view is selected and that its window has the focus. 1266 * 1267 * @see #SELECTED_STATE_SET 1268 * @see #WINDOW_FOCUSED_STATE_SET 1269 */ 1270 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1271 // Triples 1272 /** 1273 * Indicates the view is enabled, focused and selected. 1274 * 1275 * @see #ENABLED_STATE_SET 1276 * @see #FOCUSED_STATE_SET 1277 * @see #SELECTED_STATE_SET 1278 */ 1279 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1280 /** 1281 * Indicates the view is enabled, focused and its window has the focus. 1282 * 1283 * @see #ENABLED_STATE_SET 1284 * @see #FOCUSED_STATE_SET 1285 * @see #WINDOW_FOCUSED_STATE_SET 1286 */ 1287 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1288 /** 1289 * Indicates the view is enabled, selected and its window has the focus. 1290 * 1291 * @see #ENABLED_STATE_SET 1292 * @see #SELECTED_STATE_SET 1293 * @see #WINDOW_FOCUSED_STATE_SET 1294 */ 1295 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1296 /** 1297 * Indicates the view is focused, selected and its window has the focus. 1298 * 1299 * @see #FOCUSED_STATE_SET 1300 * @see #SELECTED_STATE_SET 1301 * @see #WINDOW_FOCUSED_STATE_SET 1302 */ 1303 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1304 /** 1305 * Indicates the view is enabled, focused, selected and its window 1306 * has the focus. 1307 * 1308 * @see #ENABLED_STATE_SET 1309 * @see #FOCUSED_STATE_SET 1310 * @see #SELECTED_STATE_SET 1311 * @see #WINDOW_FOCUSED_STATE_SET 1312 */ 1313 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1314 /** 1315 * Indicates the view is pressed and its window has the focus. 1316 * 1317 * @see #PRESSED_STATE_SET 1318 * @see #WINDOW_FOCUSED_STATE_SET 1319 */ 1320 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1321 /** 1322 * Indicates the view is pressed and selected. 1323 * 1324 * @see #PRESSED_STATE_SET 1325 * @see #SELECTED_STATE_SET 1326 */ 1327 protected static final int[] PRESSED_SELECTED_STATE_SET; 1328 /** 1329 * Indicates the view is pressed, selected and its window has the focus. 1330 * 1331 * @see #PRESSED_STATE_SET 1332 * @see #SELECTED_STATE_SET 1333 * @see #WINDOW_FOCUSED_STATE_SET 1334 */ 1335 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1336 /** 1337 * Indicates the view is pressed and focused. 1338 * 1339 * @see #PRESSED_STATE_SET 1340 * @see #FOCUSED_STATE_SET 1341 */ 1342 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1343 /** 1344 * Indicates the view is pressed, focused and its window has the focus. 1345 * 1346 * @see #PRESSED_STATE_SET 1347 * @see #FOCUSED_STATE_SET 1348 * @see #WINDOW_FOCUSED_STATE_SET 1349 */ 1350 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1351 /** 1352 * Indicates the view is pressed, focused and selected. 1353 * 1354 * @see #PRESSED_STATE_SET 1355 * @see #SELECTED_STATE_SET 1356 * @see #FOCUSED_STATE_SET 1357 */ 1358 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1359 /** 1360 * Indicates the view is pressed, focused, selected and its window has the focus. 1361 * 1362 * @see #PRESSED_STATE_SET 1363 * @see #FOCUSED_STATE_SET 1364 * @see #SELECTED_STATE_SET 1365 * @see #WINDOW_FOCUSED_STATE_SET 1366 */ 1367 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1368 /** 1369 * Indicates the view is pressed and enabled. 1370 * 1371 * @see #PRESSED_STATE_SET 1372 * @see #ENABLED_STATE_SET 1373 */ 1374 protected static final int[] PRESSED_ENABLED_STATE_SET; 1375 /** 1376 * Indicates the view is pressed, enabled and its window has the focus. 1377 * 1378 * @see #PRESSED_STATE_SET 1379 * @see #ENABLED_STATE_SET 1380 * @see #WINDOW_FOCUSED_STATE_SET 1381 */ 1382 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1383 /** 1384 * Indicates the view is pressed, enabled and selected. 1385 * 1386 * @see #PRESSED_STATE_SET 1387 * @see #ENABLED_STATE_SET 1388 * @see #SELECTED_STATE_SET 1389 */ 1390 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1391 /** 1392 * Indicates the view is pressed, enabled, selected and its window has the 1393 * focus. 1394 * 1395 * @see #PRESSED_STATE_SET 1396 * @see #ENABLED_STATE_SET 1397 * @see #SELECTED_STATE_SET 1398 * @see #WINDOW_FOCUSED_STATE_SET 1399 */ 1400 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1401 /** 1402 * Indicates the view is pressed, enabled and focused. 1403 * 1404 * @see #PRESSED_STATE_SET 1405 * @see #ENABLED_STATE_SET 1406 * @see #FOCUSED_STATE_SET 1407 */ 1408 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1409 /** 1410 * Indicates the view is pressed, enabled, focused and its window has the 1411 * focus. 1412 * 1413 * @see #PRESSED_STATE_SET 1414 * @see #ENABLED_STATE_SET 1415 * @see #FOCUSED_STATE_SET 1416 * @see #WINDOW_FOCUSED_STATE_SET 1417 */ 1418 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1419 /** 1420 * Indicates the view is pressed, enabled, focused and selected. 1421 * 1422 * @see #PRESSED_STATE_SET 1423 * @see #ENABLED_STATE_SET 1424 * @see #SELECTED_STATE_SET 1425 * @see #FOCUSED_STATE_SET 1426 */ 1427 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1428 /** 1429 * Indicates the view is pressed, enabled, focused, selected and its window 1430 * has the focus. 1431 * 1432 * @see #PRESSED_STATE_SET 1433 * @see #ENABLED_STATE_SET 1434 * @see #SELECTED_STATE_SET 1435 * @see #FOCUSED_STATE_SET 1436 * @see #WINDOW_FOCUSED_STATE_SET 1437 */ 1438 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1439 1440 /** 1441 * The order here is very important to {@link #getDrawableState()} 1442 */ 1443 private static final int[][] VIEW_STATE_SETS; 1444 1445 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1446 static final int VIEW_STATE_SELECTED = 1 << 1; 1447 static final int VIEW_STATE_FOCUSED = 1 << 2; 1448 static final int VIEW_STATE_ENABLED = 1 << 3; 1449 static final int VIEW_STATE_PRESSED = 1 << 4; 1450 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1451 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1452 static final int VIEW_STATE_HOVERED = 1 << 7; 1453 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1454 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1455 1456 static final int[] VIEW_STATE_IDS = new int[] { 1457 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1458 R.attr.state_selected, VIEW_STATE_SELECTED, 1459 R.attr.state_focused, VIEW_STATE_FOCUSED, 1460 R.attr.state_enabled, VIEW_STATE_ENABLED, 1461 R.attr.state_pressed, VIEW_STATE_PRESSED, 1462 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1463 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1464 R.attr.state_hovered, VIEW_STATE_HOVERED, 1465 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1466 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1467 }; 1468 1469 static { 1470 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1471 throw new IllegalStateException( 1472 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1473 } 1474 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1475 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1476 int viewState = R.styleable.ViewDrawableStates[i]; 1477 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1478 if (VIEW_STATE_IDS[j] == viewState) { 1479 orderedIds[i * 2] = viewState; 1480 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1481 } 1482 } 1483 } 1484 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1485 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1486 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1487 int numBits = Integer.bitCount(i); 1488 int[] set = new int[numBits]; 1489 int pos = 0; 1490 for (int j = 0; j < orderedIds.length; j += 2) { 1491 if ((i & orderedIds[j+1]) != 0) { 1492 set[pos++] = orderedIds[j]; 1493 } 1494 } 1495 VIEW_STATE_SETS[i] = set; 1496 } 1497 1498 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1499 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1500 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1501 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1502 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1503 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1504 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1505 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1506 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1507 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1508 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1509 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1510 | VIEW_STATE_FOCUSED]; 1511 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1512 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1513 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1514 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1515 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1516 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1517 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1518 | VIEW_STATE_ENABLED]; 1519 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1520 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1521 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1522 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1523 | VIEW_STATE_ENABLED]; 1524 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1525 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1526 | VIEW_STATE_ENABLED]; 1527 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1528 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1529 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1530 1531 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1532 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1533 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1534 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1535 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1536 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1537 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1538 | VIEW_STATE_PRESSED]; 1539 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1540 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1541 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1542 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1543 | VIEW_STATE_PRESSED]; 1544 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1545 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1546 | VIEW_STATE_PRESSED]; 1547 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1548 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1549 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1550 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1551 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1552 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1553 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1554 | VIEW_STATE_PRESSED]; 1555 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1556 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1557 | VIEW_STATE_PRESSED]; 1558 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1559 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1560 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1561 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1562 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1563 | VIEW_STATE_PRESSED]; 1564 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1565 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1566 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1567 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1568 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1569 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1570 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1571 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1572 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1573 | VIEW_STATE_PRESSED]; 1574 } 1575 1576 /** 1577 * Accessibility event types that are dispatched for text population. 1578 */ 1579 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1580 AccessibilityEvent.TYPE_VIEW_CLICKED 1581 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1582 | AccessibilityEvent.TYPE_VIEW_SELECTED 1583 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1584 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1585 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1586 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1587 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1588 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1589 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1590 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1591 1592 /** 1593 * Temporary Rect currently for use in setBackground(). This will probably 1594 * be extended in the future to hold our own class with more than just 1595 * a Rect. :) 1596 */ 1597 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1598 1599 /** 1600 * Map used to store views' tags. 1601 */ 1602 private SparseArray<Object> mKeyedTags; 1603 1604 /** 1605 * The next available accessibility id. 1606 */ 1607 private static int sNextAccessibilityViewId; 1608 1609 /** 1610 * The animation currently associated with this view. 1611 * @hide 1612 */ 1613 protected Animation mCurrentAnimation = null; 1614 1615 /** 1616 * Width as measured during measure pass. 1617 * {@hide} 1618 */ 1619 @ViewDebug.ExportedProperty(category = "measurement") 1620 int mMeasuredWidth; 1621 1622 /** 1623 * Height as measured during measure pass. 1624 * {@hide} 1625 */ 1626 @ViewDebug.ExportedProperty(category = "measurement") 1627 int mMeasuredHeight; 1628 1629 /** 1630 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1631 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1632 * its display list. This flag, used only when hw accelerated, allows us to clear the 1633 * flag while retaining this information until it's needed (at getDisplayList() time and 1634 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1635 * 1636 * {@hide} 1637 */ 1638 boolean mRecreateDisplayList = false; 1639 1640 /** 1641 * The view's identifier. 1642 * {@hide} 1643 * 1644 * @see #setId(int) 1645 * @see #getId() 1646 */ 1647 @ViewDebug.ExportedProperty(resolveId = true) 1648 int mID = NO_ID; 1649 1650 /** 1651 * The stable ID of this view for accessibility purposes. 1652 */ 1653 int mAccessibilityViewId = NO_ID; 1654 1655 private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 1656 1657 SendViewStateChangedAccessibilityEvent mSendViewStateChangedAccessibilityEvent; 1658 1659 /** 1660 * The view's tag. 1661 * {@hide} 1662 * 1663 * @see #setTag(Object) 1664 * @see #getTag() 1665 */ 1666 protected Object mTag = null; 1667 1668 // for mPrivateFlags: 1669 /** {@hide} */ 1670 static final int PFLAG_WANTS_FOCUS = 0x00000001; 1671 /** {@hide} */ 1672 static final int PFLAG_FOCUSED = 0x00000002; 1673 /** {@hide} */ 1674 static final int PFLAG_SELECTED = 0x00000004; 1675 /** {@hide} */ 1676 static final int PFLAG_IS_ROOT_NAMESPACE = 0x00000008; 1677 /** {@hide} */ 1678 static final int PFLAG_HAS_BOUNDS = 0x00000010; 1679 /** {@hide} */ 1680 static final int PFLAG_DRAWN = 0x00000020; 1681 /** 1682 * When this flag is set, this view is running an animation on behalf of its 1683 * children and should therefore not cancel invalidate requests, even if they 1684 * lie outside of this view's bounds. 1685 * 1686 * {@hide} 1687 */ 1688 static final int PFLAG_DRAW_ANIMATION = 0x00000040; 1689 /** {@hide} */ 1690 static final int PFLAG_SKIP_DRAW = 0x00000080; 1691 /** {@hide} */ 1692 static final int PFLAG_ONLY_DRAWS_BACKGROUND = 0x00000100; 1693 /** {@hide} */ 1694 static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1695 /** {@hide} */ 1696 static final int PFLAG_DRAWABLE_STATE_DIRTY = 0x00000400; 1697 /** {@hide} */ 1698 static final int PFLAG_MEASURED_DIMENSION_SET = 0x00000800; 1699 /** {@hide} */ 1700 static final int PFLAG_FORCE_LAYOUT = 0x00001000; 1701 /** {@hide} */ 1702 static final int PFLAG_LAYOUT_REQUIRED = 0x00002000; 1703 1704 private static final int PFLAG_PRESSED = 0x00004000; 1705 1706 /** {@hide} */ 1707 static final int PFLAG_DRAWING_CACHE_VALID = 0x00008000; 1708 /** 1709 * Flag used to indicate that this view should be drawn once more (and only once 1710 * more) after its animation has completed. 1711 * {@hide} 1712 */ 1713 static final int PFLAG_ANIMATION_STARTED = 0x00010000; 1714 1715 private static final int PFLAG_SAVE_STATE_CALLED = 0x00020000; 1716 1717 /** 1718 * Indicates that the View returned true when onSetAlpha() was called and that 1719 * the alpha must be restored. 1720 * {@hide} 1721 */ 1722 static final int PFLAG_ALPHA_SET = 0x00040000; 1723 1724 /** 1725 * Set by {@link #setScrollContainer(boolean)}. 1726 */ 1727 static final int PFLAG_SCROLL_CONTAINER = 0x00080000; 1728 1729 /** 1730 * Set by {@link #setScrollContainer(boolean)}. 1731 */ 1732 static final int PFLAG_SCROLL_CONTAINER_ADDED = 0x00100000; 1733 1734 /** 1735 * View flag indicating whether this view was invalidated (fully or partially.) 1736 * 1737 * @hide 1738 */ 1739 static final int PFLAG_DIRTY = 0x00200000; 1740 1741 /** 1742 * View flag indicating whether this view was invalidated by an opaque 1743 * invalidate request. 1744 * 1745 * @hide 1746 */ 1747 static final int PFLAG_DIRTY_OPAQUE = 0x00400000; 1748 1749 /** 1750 * Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}. 1751 * 1752 * @hide 1753 */ 1754 static final int PFLAG_DIRTY_MASK = 0x00600000; 1755 1756 /** 1757 * Indicates whether the background is opaque. 1758 * 1759 * @hide 1760 */ 1761 static final int PFLAG_OPAQUE_BACKGROUND = 0x00800000; 1762 1763 /** 1764 * Indicates whether the scrollbars are opaque. 1765 * 1766 * @hide 1767 */ 1768 static final int PFLAG_OPAQUE_SCROLLBARS = 0x01000000; 1769 1770 /** 1771 * Indicates whether the view is opaque. 1772 * 1773 * @hide 1774 */ 1775 static final int PFLAG_OPAQUE_MASK = 0x01800000; 1776 1777 /** 1778 * Indicates a prepressed state; 1779 * the short time between ACTION_DOWN and recognizing 1780 * a 'real' press. Prepressed is used to recognize quick taps 1781 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1782 * 1783 * @hide 1784 */ 1785 private static final int PFLAG_PREPRESSED = 0x02000000; 1786 1787 /** 1788 * Indicates whether the view is temporarily detached. 1789 * 1790 * @hide 1791 */ 1792 static final int PFLAG_CANCEL_NEXT_UP_EVENT = 0x04000000; 1793 1794 /** 1795 * Indicates that we should awaken scroll bars once attached 1796 * 1797 * @hide 1798 */ 1799 private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1800 1801 /** 1802 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1803 * @hide 1804 */ 1805 private static final int PFLAG_HOVERED = 0x10000000; 1806 1807 /** 1808 * no longer needed, should be reused 1809 */ 1810 private static final int PFLAG_DOES_NOTHING_REUSE_PLEASE = 0x20000000; 1811 1812 /** {@hide} */ 1813 static final int PFLAG_ACTIVATED = 0x40000000; 1814 1815 /** 1816 * Indicates that this view was specifically invalidated, not just dirtied because some 1817 * child view was invalidated. The flag is used to determine when we need to recreate 1818 * a view's display list (as opposed to just returning a reference to its existing 1819 * display list). 1820 * 1821 * @hide 1822 */ 1823 static final int PFLAG_INVALIDATED = 0x80000000; 1824 1825 /** 1826 * Masks for mPrivateFlags2, as generated by dumpFlags(): 1827 * 1828 * |-------|-------|-------|-------| 1829 * 1 PFLAG2_DRAG_CAN_ACCEPT 1830 * 1 PFLAG2_DRAG_HOVERED 1831 * 11 PFLAG2_LAYOUT_DIRECTION_MASK 1832 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL 1833 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED 1834 * 11 PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK 1835 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[1] 1836 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[2] 1837 * 11 PFLAG2_TEXT_DIRECTION_FLAGS[3] 1838 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[4] 1839 * 1 1 PFLAG2_TEXT_DIRECTION_FLAGS[5] 1840 * 111 PFLAG2_TEXT_DIRECTION_MASK 1841 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED 1842 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT 1843 * 111 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK 1844 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[1] 1845 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[2] 1846 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[3] 1847 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[4] 1848 * 1 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[5] 1849 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[6] 1850 * 111 PFLAG2_TEXT_ALIGNMENT_MASK 1851 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED 1852 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT 1853 * 111 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK 1854 * 111 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK 1855 * 11 PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK 1856 * 1 PFLAG2_ACCESSIBILITY_FOCUSED 1857 * 1 PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED 1858 * 1 PFLAG2_VIEW_QUICK_REJECTED 1859 * 1 PFLAG2_PADDING_RESOLVED 1860 * 1 PFLAG2_DRAWABLE_RESOLVED 1861 * 1 PFLAG2_HAS_TRANSIENT_STATE 1862 * |-------|-------|-------|-------| 1863 */ 1864 1865 /** 1866 * Indicates that this view has reported that it can accept the current drag's content. 1867 * Cleared when the drag operation concludes. 1868 * @hide 1869 */ 1870 static final int PFLAG2_DRAG_CAN_ACCEPT = 0x00000001; 1871 1872 /** 1873 * Indicates that this view is currently directly under the drag location in a 1874 * drag-and-drop operation involving content that it can accept. Cleared when 1875 * the drag exits the view, or when the drag operation concludes. 1876 * @hide 1877 */ 1878 static final int PFLAG2_DRAG_HOVERED = 0x00000002; 1879 1880 /** @hide */ 1881 @IntDef({ 1882 LAYOUT_DIRECTION_LTR, 1883 LAYOUT_DIRECTION_RTL, 1884 LAYOUT_DIRECTION_INHERIT, 1885 LAYOUT_DIRECTION_LOCALE 1886 }) 1887 @Retention(RetentionPolicy.SOURCE) 1888 // Not called LayoutDirection to avoid conflict with android.util.LayoutDirection 1889 public @interface LayoutDir {} 1890 1891 /** @hide */ 1892 @IntDef({ 1893 LAYOUT_DIRECTION_LTR, 1894 LAYOUT_DIRECTION_RTL 1895 }) 1896 @Retention(RetentionPolicy.SOURCE) 1897 public @interface ResolvedLayoutDir {} 1898 1899 /** 1900 * Horizontal layout direction of this view is from Left to Right. 1901 * Use with {@link #setLayoutDirection}. 1902 */ 1903 public static final int LAYOUT_DIRECTION_LTR = LayoutDirection.LTR; 1904 1905 /** 1906 * Horizontal layout direction of this view is from Right to Left. 1907 * Use with {@link #setLayoutDirection}. 1908 */ 1909 public static final int LAYOUT_DIRECTION_RTL = LayoutDirection.RTL; 1910 1911 /** 1912 * Horizontal layout direction of this view is inherited from its parent. 1913 * Use with {@link #setLayoutDirection}. 1914 */ 1915 public static final int LAYOUT_DIRECTION_INHERIT = LayoutDirection.INHERIT; 1916 1917 /** 1918 * Horizontal layout direction of this view is from deduced from the default language 1919 * script for the locale. Use with {@link #setLayoutDirection}. 1920 */ 1921 public static final int LAYOUT_DIRECTION_LOCALE = LayoutDirection.LOCALE; 1922 1923 /** 1924 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1925 * @hide 1926 */ 1927 static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2; 1928 1929 /** 1930 * Mask for use with private flags indicating bits used for horizontal layout direction. 1931 * @hide 1932 */ 1933 static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1934 1935 /** 1936 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1937 * right-to-left direction. 1938 * @hide 1939 */ 1940 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1941 1942 /** 1943 * Indicates whether the view horizontal layout direction has been resolved. 1944 * @hide 1945 */ 1946 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1947 1948 /** 1949 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1950 * @hide 1951 */ 1952 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C 1953 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1954 1955 /* 1956 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1957 * flag value. 1958 * @hide 1959 */ 1960 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1961 LAYOUT_DIRECTION_LTR, 1962 LAYOUT_DIRECTION_RTL, 1963 LAYOUT_DIRECTION_INHERIT, 1964 LAYOUT_DIRECTION_LOCALE 1965 }; 1966 1967 /** 1968 * Default horizontal layout direction. 1969 */ 1970 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1971 1972 /** 1973 * Default horizontal layout direction. 1974 * @hide 1975 */ 1976 static final int LAYOUT_DIRECTION_RESOLVED_DEFAULT = LAYOUT_DIRECTION_LTR; 1977 1978 /** 1979 * Text direction is inherited thru {@link ViewGroup} 1980 */ 1981 public static final int TEXT_DIRECTION_INHERIT = 0; 1982 1983 /** 1984 * Text direction is using "first strong algorithm". The first strong directional character 1985 * determines the paragraph direction. If there is no strong directional character, the 1986 * paragraph direction is the view's resolved layout direction. 1987 */ 1988 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1989 1990 /** 1991 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1992 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1993 * If there are neither, the paragraph direction is the view's resolved layout direction. 1994 */ 1995 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1996 1997 /** 1998 * Text direction is forced to LTR. 1999 */ 2000 public static final int TEXT_DIRECTION_LTR = 3; 2001 2002 /** 2003 * Text direction is forced to RTL. 2004 */ 2005 public static final int TEXT_DIRECTION_RTL = 4; 2006 2007 /** 2008 * Text direction is coming from the system Locale. 2009 */ 2010 public static final int TEXT_DIRECTION_LOCALE = 5; 2011 2012 /** 2013 * Default text direction is inherited 2014 */ 2015 private static final int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 2016 2017 /** 2018 * Default resolved text direction 2019 * @hide 2020 */ 2021 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_FIRST_STRONG; 2022 2023 /** 2024 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 2025 * @hide 2026 */ 2027 static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6; 2028 2029 /** 2030 * Mask for use with private flags indicating bits used for text direction. 2031 * @hide 2032 */ 2033 static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007 2034 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 2035 2036 /** 2037 * Array of text direction flags for mapping attribute "textDirection" to correct 2038 * flag value. 2039 * @hide 2040 */ 2041 private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = { 2042 TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 2043 TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 2044 TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 2045 TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 2046 TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 2047 TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT 2048 }; 2049 2050 /** 2051 * Indicates whether the view text direction has been resolved. 2052 * @hide 2053 */ 2054 static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008 2055 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 2056 2057 /** 2058 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2059 * @hide 2060 */ 2061 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 2062 2063 /** 2064 * Mask for use with private flags indicating bits used for resolved text direction. 2065 * @hide 2066 */ 2067 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 2068 << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 2069 2070 /** 2071 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 2072 * @hide 2073 */ 2074 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT = 2075 TEXT_DIRECTION_RESOLVED_DEFAULT << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 2076 2077 /** @hide */ 2078 @IntDef({ 2079 TEXT_ALIGNMENT_INHERIT, 2080 TEXT_ALIGNMENT_GRAVITY, 2081 TEXT_ALIGNMENT_CENTER, 2082 TEXT_ALIGNMENT_TEXT_START, 2083 TEXT_ALIGNMENT_TEXT_END, 2084 TEXT_ALIGNMENT_VIEW_START, 2085 TEXT_ALIGNMENT_VIEW_END 2086 }) 2087 @Retention(RetentionPolicy.SOURCE) 2088 public @interface TextAlignment {} 2089 2090 /** 2091 * Default text alignment. The text alignment of this View is inherited from its parent. 2092 * Use with {@link #setTextAlignment(int)} 2093 */ 2094 public static final int TEXT_ALIGNMENT_INHERIT = 0; 2095 2096 /** 2097 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 2098 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 2099 * 2100 * Use with {@link #setTextAlignment(int)} 2101 */ 2102 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 2103 2104 /** 2105 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 2106 * 2107 * Use with {@link #setTextAlignment(int)} 2108 */ 2109 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 2110 2111 /** 2112 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 2113 * 2114 * Use with {@link #setTextAlignment(int)} 2115 */ 2116 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2117 2118 /** 2119 * Center the paragraph, e.g. ALIGN_CENTER. 2120 * 2121 * Use with {@link #setTextAlignment(int)} 2122 */ 2123 public static final int TEXT_ALIGNMENT_CENTER = 4; 2124 2125 /** 2126 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2127 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2128 * 2129 * Use with {@link #setTextAlignment(int)} 2130 */ 2131 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2132 2133 /** 2134 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2135 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2136 * 2137 * Use with {@link #setTextAlignment(int)} 2138 */ 2139 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2140 2141 /** 2142 * Default text alignment is inherited 2143 */ 2144 private static final int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2145 2146 /** 2147 * Default resolved text alignment 2148 * @hide 2149 */ 2150 static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2151 2152 /** 2153 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2154 * @hide 2155 */ 2156 static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13; 2157 2158 /** 2159 * Mask for use with private flags indicating bits used for text alignment. 2160 * @hide 2161 */ 2162 static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2163 2164 /** 2165 * Array of text direction flags for mapping attribute "textAlignment" to correct 2166 * flag value. 2167 * @hide 2168 */ 2169 private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = { 2170 TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2171 TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2172 TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2173 TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2174 TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2175 TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2176 TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 2177 }; 2178 2179 /** 2180 * Indicates whether the view text alignment has been resolved. 2181 * @hide 2182 */ 2183 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2184 2185 /** 2186 * Bit shift to get the resolved text alignment. 2187 * @hide 2188 */ 2189 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2190 2191 /** 2192 * Mask for use with private flags indicating bits used for text alignment. 2193 * @hide 2194 */ 2195 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 2196 << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2197 2198 /** 2199 * Indicates whether if the view text alignment has been resolved to gravity 2200 */ 2201 private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2202 TEXT_ALIGNMENT_RESOLVED_DEFAULT << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2203 2204 // Accessiblity constants for mPrivateFlags2 2205 2206 /** 2207 * Shift for the bits in {@link #mPrivateFlags2} related to the 2208 * "importantForAccessibility" attribute. 2209 */ 2210 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2211 2212 /** 2213 * Automatically determine whether a view is important for accessibility. 2214 */ 2215 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2216 2217 /** 2218 * The view is important for accessibility. 2219 */ 2220 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2221 2222 /** 2223 * The view is not important for accessibility. 2224 */ 2225 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2226 2227 /** 2228 * The view is not important for accessibility, nor are any of its 2229 * descendant views. 2230 */ 2231 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS = 0x00000004; 2232 2233 /** 2234 * The default whether the view is important for accessibility. 2235 */ 2236 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2237 2238 /** 2239 * Mask for obtainig the bits which specify how to determine 2240 * whether a view is important for accessibility. 2241 */ 2242 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2243 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO 2244 | IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) 2245 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2246 2247 /** 2248 * Shift for the bits in {@link #mPrivateFlags2} related to the 2249 * "accessibilityLiveRegion" attribute. 2250 */ 2251 static final int PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT = 23; 2252 2253 /** 2254 * Live region mode specifying that accessibility services should not 2255 * automatically announce changes to this view. This is the default live 2256 * region mode for most views. 2257 * <p> 2258 * Use with {@link #setAccessibilityLiveRegion(int)}. 2259 */ 2260 public static final int ACCESSIBILITY_LIVE_REGION_NONE = 0x00000000; 2261 2262 /** 2263 * Live region mode specifying that accessibility services should announce 2264 * changes to this view. 2265 * <p> 2266 * Use with {@link #setAccessibilityLiveRegion(int)}. 2267 */ 2268 public static final int ACCESSIBILITY_LIVE_REGION_POLITE = 0x00000001; 2269 2270 /** 2271 * Live region mode specifying that accessibility services should interrupt 2272 * ongoing speech to immediately announce changes to this view. 2273 * <p> 2274 * Use with {@link #setAccessibilityLiveRegion(int)}. 2275 */ 2276 public static final int ACCESSIBILITY_LIVE_REGION_ASSERTIVE = 0x00000002; 2277 2278 /** 2279 * The default whether the view is important for accessibility. 2280 */ 2281 static final int ACCESSIBILITY_LIVE_REGION_DEFAULT = ACCESSIBILITY_LIVE_REGION_NONE; 2282 2283 /** 2284 * Mask for obtaining the bits which specify a view's accessibility live 2285 * region mode. 2286 */ 2287 static final int PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK = (ACCESSIBILITY_LIVE_REGION_NONE 2288 | ACCESSIBILITY_LIVE_REGION_POLITE | ACCESSIBILITY_LIVE_REGION_ASSERTIVE) 2289 << PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT; 2290 2291 /** 2292 * Flag indicating whether a view has accessibility focus. 2293 */ 2294 static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x04000000; 2295 2296 /** 2297 * Flag whether the accessibility state of the subtree rooted at this view changed. 2298 */ 2299 static final int PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED = 0x08000000; 2300 2301 /** 2302 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2303 * is used to check whether later changes to the view's transform should invalidate the 2304 * view to force the quickReject test to run again. 2305 */ 2306 static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000; 2307 2308 /** 2309 * Flag indicating that start/end padding has been resolved into left/right padding 2310 * for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()} 2311 * and checked by {@link #measure(int, int)} to determine if padding needs to be resolved 2312 * during measurement. In some special cases this is required such as when an adapter-based 2313 * view measures prospective children without attaching them to a window. 2314 */ 2315 static final int PFLAG2_PADDING_RESOLVED = 0x20000000; 2316 2317 /** 2318 * Flag indicating that the start/end drawables has been resolved into left/right ones. 2319 */ 2320 static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000; 2321 2322 /** 2323 * Indicates that the view is tracking some sort of transient state 2324 * that the app should not need to be aware of, but that the framework 2325 * should take special care to preserve. 2326 */ 2327 static final int PFLAG2_HAS_TRANSIENT_STATE = 0x80000000; 2328 2329 /** 2330 * Group of bits indicating that RTL properties resolution is done. 2331 */ 2332 static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED | 2333 PFLAG2_TEXT_DIRECTION_RESOLVED | 2334 PFLAG2_TEXT_ALIGNMENT_RESOLVED | 2335 PFLAG2_PADDING_RESOLVED | 2336 PFLAG2_DRAWABLE_RESOLVED; 2337 2338 // There are a couple of flags left in mPrivateFlags2 2339 2340 /* End of masks for mPrivateFlags2 */ 2341 2342 /** 2343 * Masks for mPrivateFlags3, as generated by dumpFlags(): 2344 * 2345 * |-------|-------|-------|-------| 2346 * 1 PFLAG3_VIEW_IS_ANIMATING_TRANSFORM 2347 * 1 PFLAG3_VIEW_IS_ANIMATING_ALPHA 2348 * 1 PFLAG3_IS_LAID_OUT 2349 * 1 PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT 2350 * 1 PFLAG3_CALLED_SUPER 2351 * |-------|-------|-------|-------| 2352 */ 2353 2354 /** 2355 * Flag indicating that view has a transform animation set on it. This is used to track whether 2356 * an animation is cleared between successive frames, in order to tell the associated 2357 * DisplayList to clear its animation matrix. 2358 */ 2359 static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1; 2360 2361 /** 2362 * Flag indicating that view has an alpha animation set on it. This is used to track whether an 2363 * animation is cleared between successive frames, in order to tell the associated 2364 * DisplayList to restore its alpha value. 2365 */ 2366 static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2; 2367 2368 /** 2369 * Flag indicating that the view has been through at least one layout since it 2370 * was last attached to a window. 2371 */ 2372 static final int PFLAG3_IS_LAID_OUT = 0x4; 2373 2374 /** 2375 * Flag indicating that a call to measure() was skipped and should be done 2376 * instead when layout() is invoked. 2377 */ 2378 static final int PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT = 0x8; 2379 2380 /** 2381 * Flag indicating that an overridden method correctly called down to 2382 * the superclass implementation as required by the API spec. 2383 */ 2384 static final int PFLAG3_CALLED_SUPER = 0x10; 2385 2386 /** 2387 * Flag indicating that we're in the process of applying window insets. 2388 */ 2389 static final int PFLAG3_APPLYING_INSETS = 0x20; 2390 2391 /** 2392 * Flag indicating that we're in the process of fitting system windows using the old method. 2393 */ 2394 static final int PFLAG3_FITTING_SYSTEM_WINDOWS = 0x40; 2395 2396 /** 2397 * Flag indicating that nested scrolling is enabled for this view. 2398 * The view will optionally cooperate with views up its parent chain to allow for 2399 * integrated nested scrolling along the same axis. 2400 */ 2401 static final int PFLAG3_NESTED_SCROLLING_ENABLED = 0x80; 2402 2403 /** 2404 * Flag indicating that outline was invalidated and should be rebuilt the next time 2405 * the DisplayList is updated. 2406 */ 2407 static final int PFLAG3_OUTLINE_INVALID = 0x100; 2408 2409 /* End of masks for mPrivateFlags3 */ 2410 2411 static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED; 2412 2413 /** 2414 * Always allow a user to over-scroll this view, provided it is a 2415 * view that can scroll. 2416 * 2417 * @see #getOverScrollMode() 2418 * @see #setOverScrollMode(int) 2419 */ 2420 public static final int OVER_SCROLL_ALWAYS = 0; 2421 2422 /** 2423 * Allow a user to over-scroll this view only if the content is large 2424 * enough to meaningfully scroll, provided it is a view that can scroll. 2425 * 2426 * @see #getOverScrollMode() 2427 * @see #setOverScrollMode(int) 2428 */ 2429 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2430 2431 /** 2432 * Never allow a user to over-scroll this view. 2433 * 2434 * @see #getOverScrollMode() 2435 * @see #setOverScrollMode(int) 2436 */ 2437 public static final int OVER_SCROLL_NEVER = 2; 2438 2439 /** 2440 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2441 * requested the system UI (status bar) to be visible (the default). 2442 * 2443 * @see #setSystemUiVisibility(int) 2444 */ 2445 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2446 2447 /** 2448 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2449 * system UI to enter an unobtrusive "low profile" mode. 2450 * 2451 * <p>This is for use in games, book readers, video players, or any other 2452 * "immersive" application where the usual system chrome is deemed too distracting. 2453 * 2454 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2455 * 2456 * @see #setSystemUiVisibility(int) 2457 */ 2458 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2459 2460 /** 2461 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2462 * system navigation be temporarily hidden. 2463 * 2464 * <p>This is an even less obtrusive state than that called for by 2465 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2466 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2467 * those to disappear. This is useful (in conjunction with the 2468 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2469 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2470 * window flags) for displaying content using every last pixel on the display. 2471 * 2472 * <p>There is a limitation: because navigation controls are so important, the least user 2473 * interaction will cause them to reappear immediately. When this happens, both 2474 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2475 * so that both elements reappear at the same time. 2476 * 2477 * @see #setSystemUiVisibility(int) 2478 */ 2479 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2480 2481 /** 2482 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2483 * into the normal fullscreen mode so that its content can take over the screen 2484 * while still allowing the user to interact with the application. 2485 * 2486 * <p>This has the same visual effect as 2487 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2488 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2489 * meaning that non-critical screen decorations (such as the status bar) will be 2490 * hidden while the user is in the View's window, focusing the experience on 2491 * that content. Unlike the window flag, if you are using ActionBar in 2492 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2493 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2494 * hide the action bar. 2495 * 2496 * <p>This approach to going fullscreen is best used over the window flag when 2497 * it is a transient state -- that is, the application does this at certain 2498 * points in its user interaction where it wants to allow the user to focus 2499 * on content, but not as a continuous state. For situations where the application 2500 * would like to simply stay full screen the entire time (such as a game that 2501 * wants to take over the screen), the 2502 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2503 * is usually a better approach. The state set here will be removed by the system 2504 * in various situations (such as the user moving to another application) like 2505 * the other system UI states. 2506 * 2507 * <p>When using this flag, the application should provide some easy facility 2508 * for the user to go out of it. A common example would be in an e-book 2509 * reader, where tapping on the screen brings back whatever screen and UI 2510 * decorations that had been hidden while the user was immersed in reading 2511 * the book. 2512 * 2513 * @see #setSystemUiVisibility(int) 2514 */ 2515 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2516 2517 /** 2518 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2519 * flags, we would like a stable view of the content insets given to 2520 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2521 * will always represent the worst case that the application can expect 2522 * as a continuous state. In the stock Android UI this is the space for 2523 * the system bar, nav bar, and status bar, but not more transient elements 2524 * such as an input method. 2525 * 2526 * The stable layout your UI sees is based on the system UI modes you can 2527 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2528 * then you will get a stable layout for changes of the 2529 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2530 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2531 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2532 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2533 * with a stable layout. (Note that you should avoid using 2534 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2535 * 2536 * If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN} 2537 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2538 * then a hidden status bar will be considered a "stable" state for purposes 2539 * here. This allows your UI to continually hide the status bar, while still 2540 * using the system UI flags to hide the action bar while still retaining 2541 * a stable layout. Note that changing the window fullscreen flag will never 2542 * provide a stable layout for a clean transition. 2543 * 2544 * <p>If you are using ActionBar in 2545 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2546 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2547 * insets it adds to those given to the application. 2548 */ 2549 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2550 2551 /** 2552 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2553 * to be layed out as if it has requested 2554 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2555 * allows it to avoid artifacts when switching in and out of that mode, at 2556 * the expense that some of its user interface may be covered by screen 2557 * decorations when they are shown. You can perform layout of your inner 2558 * UI elements to account for the navigation system UI through the 2559 * {@link #fitSystemWindows(Rect)} method. 2560 */ 2561 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2562 2563 /** 2564 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2565 * to be layed out as if it has requested 2566 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2567 * allows it to avoid artifacts when switching in and out of that mode, at 2568 * the expense that some of its user interface may be covered by screen 2569 * decorations when they are shown. You can perform layout of your inner 2570 * UI elements to account for non-fullscreen system UI through the 2571 * {@link #fitSystemWindows(Rect)} method. 2572 */ 2573 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2574 2575 /** 2576 * Flag for {@link #setSystemUiVisibility(int)}: View would like to remain interactive when 2577 * hiding the navigation bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. If this flag is 2578 * not set, {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} will be force cleared by the system on any 2579 * user interaction. 2580 * <p>Since this flag is a modifier for {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, it only 2581 * has an effect when used in combination with that flag.</p> 2582 */ 2583 public static final int SYSTEM_UI_FLAG_IMMERSIVE = 0x00000800; 2584 2585 /** 2586 * Flag for {@link #setSystemUiVisibility(int)}: View would like to remain interactive when 2587 * hiding the status bar with {@link #SYSTEM_UI_FLAG_FULLSCREEN} and/or hiding the navigation 2588 * bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. Use this flag to create an immersive 2589 * experience while also hiding the system bars. If this flag is not set, 2590 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} will be force cleared by the system on any user 2591 * interaction, and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be force-cleared by the system 2592 * if the user swipes from the top of the screen. 2593 * <p>When system bars are hidden in immersive mode, they can be revealed temporarily with 2594 * system gestures, such as swiping from the top of the screen. These transient system bars 2595 * will overlay app’s content, may have some degree of transparency, and will automatically 2596 * hide after a short timeout. 2597 * </p><p>Since this flag is a modifier for {@link #SYSTEM_UI_FLAG_FULLSCREEN} and 2598 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, it only has an effect when used in combination 2599 * with one or both of those flags.</p> 2600 */ 2601 public static final int SYSTEM_UI_FLAG_IMMERSIVE_STICKY = 0x00001000; 2602 2603 /** 2604 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2605 */ 2606 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2607 2608 /** 2609 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2610 */ 2611 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2612 2613 /** 2614 * @hide 2615 * 2616 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2617 * out of the public fields to keep the undefined bits out of the developer's way. 2618 * 2619 * Flag to make the status bar not expandable. Unless you also 2620 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2621 */ 2622 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2623 2624 /** 2625 * @hide 2626 * 2627 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2628 * out of the public fields to keep the undefined bits out of the developer's way. 2629 * 2630 * Flag to hide notification icons and scrolling ticker text. 2631 */ 2632 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2633 2634 /** 2635 * @hide 2636 * 2637 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2638 * out of the public fields to keep the undefined bits out of the developer's way. 2639 * 2640 * Flag to disable incoming notification alerts. This will not block 2641 * icons, but it will block sound, vibrating and other visual or aural notifications. 2642 */ 2643 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2644 2645 /** 2646 * @hide 2647 * 2648 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2649 * out of the public fields to keep the undefined bits out of the developer's way. 2650 * 2651 * Flag to hide only the scrolling ticker. Note that 2652 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2653 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2654 */ 2655 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2656 2657 /** 2658 * @hide 2659 * 2660 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2661 * out of the public fields to keep the undefined bits out of the developer's way. 2662 * 2663 * Flag to hide the center system info area. 2664 */ 2665 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2666 2667 /** 2668 * @hide 2669 * 2670 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2671 * out of the public fields to keep the undefined bits out of the developer's way. 2672 * 2673 * Flag to hide only the home button. Don't use this 2674 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2675 */ 2676 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2677 2678 /** 2679 * @hide 2680 * 2681 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2682 * out of the public fields to keep the undefined bits out of the developer's way. 2683 * 2684 * Flag to hide only the back button. Don't use this 2685 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2686 */ 2687 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2688 2689 /** 2690 * @hide 2691 * 2692 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2693 * out of the public fields to keep the undefined bits out of the developer's way. 2694 * 2695 * Flag to hide only the clock. You might use this if your activity has 2696 * its own clock making the status bar's clock redundant. 2697 */ 2698 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2699 2700 /** 2701 * @hide 2702 * 2703 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2704 * out of the public fields to keep the undefined bits out of the developer's way. 2705 * 2706 * Flag to hide only the recent apps button. Don't use this 2707 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2708 */ 2709 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2710 2711 /** 2712 * @hide 2713 * 2714 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2715 * out of the public fields to keep the undefined bits out of the developer's way. 2716 * 2717 * Flag to disable the global search gesture. Don't use this 2718 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2719 */ 2720 public static final int STATUS_BAR_DISABLE_SEARCH = 0x02000000; 2721 2722 /** 2723 * @hide 2724 * 2725 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2726 * out of the public fields to keep the undefined bits out of the developer's way. 2727 * 2728 * Flag to specify that the status bar is displayed in transient mode. 2729 */ 2730 public static final int STATUS_BAR_TRANSIENT = 0x04000000; 2731 2732 /** 2733 * @hide 2734 * 2735 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2736 * out of the public fields to keep the undefined bits out of the developer's way. 2737 * 2738 * Flag to specify that the navigation bar is displayed in transient mode. 2739 */ 2740 public static final int NAVIGATION_BAR_TRANSIENT = 0x08000000; 2741 2742 /** 2743 * @hide 2744 * 2745 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2746 * out of the public fields to keep the undefined bits out of the developer's way. 2747 * 2748 * Flag to specify that the hidden status bar would like to be shown. 2749 */ 2750 public static final int STATUS_BAR_UNHIDE = 0x10000000; 2751 2752 /** 2753 * @hide 2754 * 2755 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2756 * out of the public fields to keep the undefined bits out of the developer's way. 2757 * 2758 * Flag to specify that the hidden navigation bar would like to be shown. 2759 */ 2760 public static final int NAVIGATION_BAR_UNHIDE = 0x20000000; 2761 2762 /** 2763 * @hide 2764 * 2765 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2766 * out of the public fields to keep the undefined bits out of the developer's way. 2767 * 2768 * Flag to specify that the status bar is displayed in translucent mode. 2769 */ 2770 public static final int STATUS_BAR_TRANSLUCENT = 0x40000000; 2771 2772 /** 2773 * @hide 2774 * 2775 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2776 * out of the public fields to keep the undefined bits out of the developer's way. 2777 * 2778 * Flag to specify that the navigation bar is displayed in translucent mode. 2779 */ 2780 public static final int NAVIGATION_BAR_TRANSLUCENT = 0x80000000; 2781 2782 /** 2783 * @hide 2784 * 2785 * Whether Recents is visible or not. 2786 */ 2787 public static final int RECENT_APPS_VISIBLE = 0x00004000; 2788 2789 /** 2790 * @hide 2791 * 2792 * Makes system ui transparent. 2793 */ 2794 public static final int SYSTEM_UI_TRANSPARENT = 0x00008000; 2795 2796 /** 2797 * @hide 2798 */ 2799 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x00003FFF; 2800 2801 /** 2802 * These are the system UI flags that can be cleared by events outside 2803 * of an application. Currently this is just the ability to tap on the 2804 * screen while hiding the navigation bar to have it return. 2805 * @hide 2806 */ 2807 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2808 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2809 | SYSTEM_UI_FLAG_FULLSCREEN; 2810 2811 /** 2812 * Flags that can impact the layout in relation to system UI. 2813 */ 2814 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2815 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2816 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2817 2818 /** @hide */ 2819 @IntDef(flag = true, 2820 value = { FIND_VIEWS_WITH_TEXT, FIND_VIEWS_WITH_CONTENT_DESCRIPTION }) 2821 @Retention(RetentionPolicy.SOURCE) 2822 public @interface FindViewFlags {} 2823 2824 /** 2825 * Find views that render the specified text. 2826 * 2827 * @see #findViewsWithText(ArrayList, CharSequence, int) 2828 */ 2829 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2830 2831 /** 2832 * Find find views that contain the specified content description. 2833 * 2834 * @see #findViewsWithText(ArrayList, CharSequence, int) 2835 */ 2836 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2837 2838 /** 2839 * Find views that contain {@link AccessibilityNodeProvider}. Such 2840 * a View is a root of virtual view hierarchy and may contain the searched 2841 * text. If this flag is set Views with providers are automatically 2842 * added and it is a responsibility of the client to call the APIs of 2843 * the provider to determine whether the virtual tree rooted at this View 2844 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2845 * representing the virtual views with this text. 2846 * 2847 * @see #findViewsWithText(ArrayList, CharSequence, int) 2848 * 2849 * @hide 2850 */ 2851 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2852 2853 /** 2854 * The undefined cursor position. 2855 * 2856 * @hide 2857 */ 2858 public static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1; 2859 2860 /** 2861 * Indicates that the screen has changed state and is now off. 2862 * 2863 * @see #onScreenStateChanged(int) 2864 */ 2865 public static final int SCREEN_STATE_OFF = 0x0; 2866 2867 /** 2868 * Indicates that the screen has changed state and is now on. 2869 * 2870 * @see #onScreenStateChanged(int) 2871 */ 2872 public static final int SCREEN_STATE_ON = 0x1; 2873 2874 /** 2875 * Indicates no axis of view scrolling. 2876 */ 2877 public static final int SCROLL_AXIS_NONE = 0; 2878 2879 /** 2880 * Indicates scrolling along the horizontal axis. 2881 */ 2882 public static final int SCROLL_AXIS_HORIZONTAL = 1 << 0; 2883 2884 /** 2885 * Indicates scrolling along the vertical axis. 2886 */ 2887 public static final int SCROLL_AXIS_VERTICAL = 1 << 1; 2888 2889 /** 2890 * Controls the over-scroll mode for this view. 2891 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2892 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2893 * and {@link #OVER_SCROLL_NEVER}. 2894 */ 2895 private int mOverScrollMode; 2896 2897 /** 2898 * The parent this view is attached to. 2899 * {@hide} 2900 * 2901 * @see #getParent() 2902 */ 2903 protected ViewParent mParent; 2904 2905 /** 2906 * {@hide} 2907 */ 2908 AttachInfo mAttachInfo; 2909 2910 /** 2911 * {@hide} 2912 */ 2913 @ViewDebug.ExportedProperty(flagMapping = { 2914 @ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT, 2915 name = "FORCE_LAYOUT"), 2916 @ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED, 2917 name = "LAYOUT_REQUIRED"), 2918 @ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID, 2919 name = "DRAWING_CACHE_INVALID", outputIf = false), 2920 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true), 2921 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false), 2922 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2923 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY") 2924 }, formatToHexString = true) 2925 int mPrivateFlags; 2926 int mPrivateFlags2; 2927 int mPrivateFlags3; 2928 2929 /** 2930 * This view's request for the visibility of the status bar. 2931 * @hide 2932 */ 2933 @ViewDebug.ExportedProperty(flagMapping = { 2934 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2935 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2936 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2937 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2938 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2939 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2940 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2941 equals = SYSTEM_UI_FLAG_VISIBLE, 2942 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2943 }, formatToHexString = true) 2944 int mSystemUiVisibility; 2945 2946 /** 2947 * Reference count for transient state. 2948 * @see #setHasTransientState(boolean) 2949 */ 2950 int mTransientStateCount = 0; 2951 2952 /** 2953 * Count of how many windows this view has been attached to. 2954 */ 2955 int mWindowAttachCount; 2956 2957 /** 2958 * The layout parameters associated with this view and used by the parent 2959 * {@link android.view.ViewGroup} to determine how this view should be 2960 * laid out. 2961 * {@hide} 2962 */ 2963 protected ViewGroup.LayoutParams mLayoutParams; 2964 2965 /** 2966 * The view flags hold various views states. 2967 * {@hide} 2968 */ 2969 @ViewDebug.ExportedProperty(formatToHexString = true) 2970 int mViewFlags; 2971 2972 static class TransformationInfo { 2973 /** 2974 * The transform matrix for the View. This transform is calculated internally 2975 * based on the translation, rotation, and scale properties. 2976 * 2977 * Do *not* use this variable directly; instead call getMatrix(), which will 2978 * load the value from the View's RenderNode. 2979 */ 2980 private final Matrix mMatrix = new Matrix(); 2981 2982 /** 2983 * The inverse transform matrix for the View. This transform is calculated 2984 * internally based on the translation, rotation, and scale properties. 2985 * 2986 * Do *not* use this variable directly; instead call getInverseMatrix(), 2987 * which will load the value from the View's RenderNode. 2988 */ 2989 private Matrix mInverseMatrix; 2990 2991 /** 2992 * The opacity of the View. This is a value from 0 to 1, where 0 means 2993 * completely transparent and 1 means completely opaque. 2994 */ 2995 @ViewDebug.ExportedProperty 2996 float mAlpha = 1f; 2997 2998 /** 2999 * The opacity of the view as manipulated by the Fade transition. This is a hidden 3000 * property only used by transitions, which is composited with the other alpha 3001 * values to calculate the final visual alpha value. 3002 */ 3003 float mTransitionAlpha = 1f; 3004 } 3005 3006 TransformationInfo mTransformationInfo; 3007 3008 /** 3009 * Current clip bounds. to which all drawing of this view are constrained. 3010 */ 3011 Rect mClipBounds = null; 3012 3013 private boolean mLastIsOpaque; 3014 3015 /** 3016 * The distance in pixels from the left edge of this view's parent 3017 * to the left edge of this view. 3018 * {@hide} 3019 */ 3020 @ViewDebug.ExportedProperty(category = "layout") 3021 protected int mLeft; 3022 /** 3023 * The distance in pixels from the left edge of this view's parent 3024 * to the right edge of this view. 3025 * {@hide} 3026 */ 3027 @ViewDebug.ExportedProperty(category = "layout") 3028 protected int mRight; 3029 /** 3030 * The distance in pixels from the top edge of this view's parent 3031 * to the top edge of this view. 3032 * {@hide} 3033 */ 3034 @ViewDebug.ExportedProperty(category = "layout") 3035 protected int mTop; 3036 /** 3037 * The distance in pixels from the top edge of this view's parent 3038 * to the bottom edge of this view. 3039 * {@hide} 3040 */ 3041 @ViewDebug.ExportedProperty(category = "layout") 3042 protected int mBottom; 3043 3044 /** 3045 * The offset, in pixels, by which the content of this view is scrolled 3046 * horizontally. 3047 * {@hide} 3048 */ 3049 @ViewDebug.ExportedProperty(category = "scrolling") 3050 protected int mScrollX; 3051 /** 3052 * The offset, in pixels, by which the content of this view is scrolled 3053 * vertically. 3054 * {@hide} 3055 */ 3056 @ViewDebug.ExportedProperty(category = "scrolling") 3057 protected int mScrollY; 3058 3059 /** 3060 * The left padding in pixels, that is the distance in pixels between the 3061 * left edge of this view and the left edge of its content. 3062 * {@hide} 3063 */ 3064 @ViewDebug.ExportedProperty(category = "padding") 3065 protected int mPaddingLeft = 0; 3066 /** 3067 * The right padding in pixels, that is the distance in pixels between the 3068 * right edge of this view and the right edge of its content. 3069 * {@hide} 3070 */ 3071 @ViewDebug.ExportedProperty(category = "padding") 3072 protected int mPaddingRight = 0; 3073 /** 3074 * The top padding in pixels, that is the distance in pixels between the 3075 * top edge of this view and the top edge of its content. 3076 * {@hide} 3077 */ 3078 @ViewDebug.ExportedProperty(category = "padding") 3079 protected int mPaddingTop; 3080 /** 3081 * The bottom padding in pixels, that is the distance in pixels between the 3082 * bottom edge of this view and the bottom edge of its content. 3083 * {@hide} 3084 */ 3085 @ViewDebug.ExportedProperty(category = "padding") 3086 protected int mPaddingBottom; 3087 3088 /** 3089 * The layout insets in pixels, that is the distance in pixels between the 3090 * visible edges of this view its bounds. 3091 */ 3092 private Insets mLayoutInsets; 3093 3094 /** 3095 * Briefly describes the view and is primarily used for accessibility support. 3096 */ 3097 private CharSequence mContentDescription; 3098 3099 /** 3100 * Specifies the id of a view for which this view serves as a label for 3101 * accessibility purposes. 3102 */ 3103 private int mLabelForId = View.NO_ID; 3104 3105 /** 3106 * Predicate for matching labeled view id with its label for 3107 * accessibility purposes. 3108 */ 3109 private MatchLabelForPredicate mMatchLabelForPredicate; 3110 3111 /** 3112 * Predicate for matching a view by its id. 3113 */ 3114 private MatchIdPredicate mMatchIdPredicate; 3115 3116 /** 3117 * Cache the paddingRight set by the user to append to the scrollbar's size. 3118 * 3119 * @hide 3120 */ 3121 @ViewDebug.ExportedProperty(category = "padding") 3122 protected int mUserPaddingRight; 3123 3124 /** 3125 * Cache the paddingBottom set by the user to append to the scrollbar's size. 3126 * 3127 * @hide 3128 */ 3129 @ViewDebug.ExportedProperty(category = "padding") 3130 protected int mUserPaddingBottom; 3131 3132 /** 3133 * Cache the paddingLeft set by the user to append to the scrollbar's size. 3134 * 3135 * @hide 3136 */ 3137 @ViewDebug.ExportedProperty(category = "padding") 3138 protected int mUserPaddingLeft; 3139 3140 /** 3141 * Cache the paddingStart set by the user to append to the scrollbar's size. 3142 * 3143 */ 3144 @ViewDebug.ExportedProperty(category = "padding") 3145 int mUserPaddingStart; 3146 3147 /** 3148 * Cache the paddingEnd set by the user to append to the scrollbar's size. 3149 * 3150 */ 3151 @ViewDebug.ExportedProperty(category = "padding") 3152 int mUserPaddingEnd; 3153 3154 /** 3155 * Cache initial left padding. 3156 * 3157 * @hide 3158 */ 3159 int mUserPaddingLeftInitial; 3160 3161 /** 3162 * Cache initial right padding. 3163 * 3164 * @hide 3165 */ 3166 int mUserPaddingRightInitial; 3167 3168 /** 3169 * Default undefined padding 3170 */ 3171 private static final int UNDEFINED_PADDING = Integer.MIN_VALUE; 3172 3173 /** 3174 * Cache if a left padding has been defined 3175 */ 3176 private boolean mLeftPaddingDefined = false; 3177 3178 /** 3179 * Cache if a right padding has been defined 3180 */ 3181 private boolean mRightPaddingDefined = false; 3182 3183 /** 3184 * @hide 3185 */ 3186 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 3187 /** 3188 * @hide 3189 */ 3190 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 3191 3192 private LongSparseLongArray mMeasureCache; 3193 3194 @ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_") 3195 private Drawable mBackground; 3196 private TintInfo mBackgroundTint; 3197 3198 /** 3199 * RenderNode used for backgrounds. 3200 * <p> 3201 * When non-null and valid, this is expected to contain an up-to-date copy 3202 * of the background drawable. It is cleared on temporary detach, and reset 3203 * on cleanup. 3204 */ 3205 private RenderNode mBackgroundRenderNode; 3206 3207 private int mBackgroundResource; 3208 private boolean mBackgroundSizeChanged; 3209 3210 private String mTransitionName; 3211 3212 private static class TintInfo { 3213 ColorStateList mTintList; 3214 PorterDuff.Mode mTintMode; 3215 boolean mHasTintMode; 3216 boolean mHasTintList; 3217 } 3218 3219 static class ListenerInfo { 3220 /** 3221 * Listener used to dispatch focus change events. 3222 * This field should be made private, so it is hidden from the SDK. 3223 * {@hide} 3224 */ 3225 protected OnFocusChangeListener mOnFocusChangeListener; 3226 3227 /** 3228 * Listeners for layout change events. 3229 */ 3230 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 3231 3232 /** 3233 * Listeners for attach events. 3234 */ 3235 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 3236 3237 /** 3238 * Listener used to dispatch click events. 3239 * This field should be made private, so it is hidden from the SDK. 3240 * {@hide} 3241 */ 3242 public OnClickListener mOnClickListener; 3243 3244 /** 3245 * Listener used to dispatch long click events. 3246 * This field should be made private, so it is hidden from the SDK. 3247 * {@hide} 3248 */ 3249 protected OnLongClickListener mOnLongClickListener; 3250 3251 /** 3252 * Listener used to build the context menu. 3253 * This field should be made private, so it is hidden from the SDK. 3254 * {@hide} 3255 */ 3256 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 3257 3258 private OnKeyListener mOnKeyListener; 3259 3260 private OnTouchListener mOnTouchListener; 3261 3262 private OnHoverListener mOnHoverListener; 3263 3264 private OnGenericMotionListener mOnGenericMotionListener; 3265 3266 private OnDragListener mOnDragListener; 3267 3268 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 3269 3270 OnApplyWindowInsetsListener mOnApplyWindowInsetsListener; 3271 } 3272 3273 ListenerInfo mListenerInfo; 3274 3275 /** 3276 * The application environment this view lives in. 3277 * This field should be made private, so it is hidden from the SDK. 3278 * {@hide} 3279 */ 3280 @ViewDebug.ExportedProperty(deepExport = true) 3281 protected Context mContext; 3282 3283 private final Resources mResources; 3284 3285 private ScrollabilityCache mScrollCache; 3286 3287 private int[] mDrawableState = null; 3288 3289 ViewOutlineProvider mOutlineProvider = ViewOutlineProvider.BACKGROUND; 3290 3291 /** 3292 * Animator that automatically runs based on state changes. 3293 */ 3294 private StateListAnimator mStateListAnimator; 3295 3296 /** 3297 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 3298 * the user may specify which view to go to next. 3299 */ 3300 private int mNextFocusLeftId = View.NO_ID; 3301 3302 /** 3303 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 3304 * the user may specify which view to go to next. 3305 */ 3306 private int mNextFocusRightId = View.NO_ID; 3307 3308 /** 3309 * When this view has focus and the next focus is {@link #FOCUS_UP}, 3310 * the user may specify which view to go to next. 3311 */ 3312 private int mNextFocusUpId = View.NO_ID; 3313 3314 /** 3315 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 3316 * the user may specify which view to go to next. 3317 */ 3318 private int mNextFocusDownId = View.NO_ID; 3319 3320 /** 3321 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 3322 * the user may specify which view to go to next. 3323 */ 3324 int mNextFocusForwardId = View.NO_ID; 3325 3326 private CheckForLongPress mPendingCheckForLongPress; 3327 private CheckForTap mPendingCheckForTap = null; 3328 private PerformClick mPerformClick; 3329 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 3330 3331 private UnsetPressedState mUnsetPressedState; 3332 3333 /** 3334 * Whether the long press's action has been invoked. The tap's action is invoked on the 3335 * up event while a long press is invoked as soon as the long press duration is reached, so 3336 * a long press could be performed before the tap is checked, in which case the tap's action 3337 * should not be invoked. 3338 */ 3339 private boolean mHasPerformedLongPress; 3340 3341 /** 3342 * The minimum height of the view. We'll try our best to have the height 3343 * of this view to at least this amount. 3344 */ 3345 @ViewDebug.ExportedProperty(category = "measurement") 3346 private int mMinHeight; 3347 3348 /** 3349 * The minimum width of the view. We'll try our best to have the width 3350 * of this view to at least this amount. 3351 */ 3352 @ViewDebug.ExportedProperty(category = "measurement") 3353 private int mMinWidth; 3354 3355 /** 3356 * The delegate to handle touch events that are physically in this view 3357 * but should be handled by another view. 3358 */ 3359 private TouchDelegate mTouchDelegate = null; 3360 3361 /** 3362 * Solid color to use as a background when creating the drawing cache. Enables 3363 * the cache to use 16 bit bitmaps instead of 32 bit. 3364 */ 3365 private int mDrawingCacheBackgroundColor = 0; 3366 3367 /** 3368 * Special tree observer used when mAttachInfo is null. 3369 */ 3370 private ViewTreeObserver mFloatingTreeObserver; 3371 3372 /** 3373 * Cache the touch slop from the context that created the view. 3374 */ 3375 private int mTouchSlop; 3376 3377 /** 3378 * Object that handles automatic animation of view properties. 3379 */ 3380 private ViewPropertyAnimator mAnimator = null; 3381 3382 /** 3383 * Flag indicating that a drag can cross window boundaries. When 3384 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 3385 * with this flag set, all visible applications will be able to participate 3386 * in the drag operation and receive the dragged content. 3387 * 3388 * @hide 3389 */ 3390 public static final int DRAG_FLAG_GLOBAL = 1; 3391 3392 /** 3393 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3394 */ 3395 private float mVerticalScrollFactor; 3396 3397 /** 3398 * Position of the vertical scroll bar. 3399 */ 3400 private int mVerticalScrollbarPosition; 3401 3402 /** 3403 * Position the scroll bar at the default position as determined by the system. 3404 */ 3405 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3406 3407 /** 3408 * Position the scroll bar along the left edge. 3409 */ 3410 public static final int SCROLLBAR_POSITION_LEFT = 1; 3411 3412 /** 3413 * Position the scroll bar along the right edge. 3414 */ 3415 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3416 3417 /** 3418 * Indicates that the view does not have a layer. 3419 * 3420 * @see #getLayerType() 3421 * @see #setLayerType(int, android.graphics.Paint) 3422 * @see #LAYER_TYPE_SOFTWARE 3423 * @see #LAYER_TYPE_HARDWARE 3424 */ 3425 public static final int LAYER_TYPE_NONE = 0; 3426 3427 /** 3428 * <p>Indicates that the view has a software layer. A software layer is backed 3429 * by a bitmap and causes the view to be rendered using Android's software 3430 * rendering pipeline, even if hardware acceleration is enabled.</p> 3431 * 3432 * <p>Software layers have various usages:</p> 3433 * <p>When the application is not using hardware acceleration, a software layer 3434 * is useful to apply a specific color filter and/or blending mode and/or 3435 * translucency to a view and all its children.</p> 3436 * <p>When the application is using hardware acceleration, a software layer 3437 * is useful to render drawing primitives not supported by the hardware 3438 * accelerated pipeline. It can also be used to cache a complex view tree 3439 * into a texture and reduce the complexity of drawing operations. For instance, 3440 * when animating a complex view tree with a translation, a software layer can 3441 * be used to render the view tree only once.</p> 3442 * <p>Software layers should be avoided when the affected view tree updates 3443 * often. Every update will require to re-render the software layer, which can 3444 * potentially be slow (particularly when hardware acceleration is turned on 3445 * since the layer will have to be uploaded into a hardware texture after every 3446 * update.)</p> 3447 * 3448 * @see #getLayerType() 3449 * @see #setLayerType(int, android.graphics.Paint) 3450 * @see #LAYER_TYPE_NONE 3451 * @see #LAYER_TYPE_HARDWARE 3452 */ 3453 public static final int LAYER_TYPE_SOFTWARE = 1; 3454 3455 /** 3456 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3457 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3458 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3459 * rendering pipeline, but only if hardware acceleration is turned on for the 3460 * view hierarchy. When hardware acceleration is turned off, hardware layers 3461 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3462 * 3463 * <p>A hardware layer is useful to apply a specific color filter and/or 3464 * blending mode and/or translucency to a view and all its children.</p> 3465 * <p>A hardware layer can be used to cache a complex view tree into a 3466 * texture and reduce the complexity of drawing operations. For instance, 3467 * when animating a complex view tree with a translation, a hardware layer can 3468 * be used to render the view tree only once.</p> 3469 * <p>A hardware layer can also be used to increase the rendering quality when 3470 * rotation transformations are applied on a view. It can also be used to 3471 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3472 * 3473 * @see #getLayerType() 3474 * @see #setLayerType(int, android.graphics.Paint) 3475 * @see #LAYER_TYPE_NONE 3476 * @see #LAYER_TYPE_SOFTWARE 3477 */ 3478 public static final int LAYER_TYPE_HARDWARE = 2; 3479 3480 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3481 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3482 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3483 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3484 }) 3485 int mLayerType = LAYER_TYPE_NONE; 3486 Paint mLayerPaint; 3487 3488 /** 3489 * Set to true when drawing cache is enabled and cannot be created. 3490 * 3491 * @hide 3492 */ 3493 public boolean mCachingFailed; 3494 private Bitmap mDrawingCache; 3495 private Bitmap mUnscaledDrawingCache; 3496 3497 /** 3498 * RenderNode holding View properties, potentially holding a DisplayList of View content. 3499 * <p> 3500 * When non-null and valid, this is expected to contain an up-to-date copy 3501 * of the View content. Its DisplayList content is cleared on temporary detach and reset on 3502 * cleanup. 3503 */ 3504 final RenderNode mRenderNode; 3505 3506 /** 3507 * Set to true when the view is sending hover accessibility events because it 3508 * is the innermost hovered view. 3509 */ 3510 private boolean mSendingHoverAccessibilityEvents; 3511 3512 /** 3513 * Delegate for injecting accessibility functionality. 3514 */ 3515 AccessibilityDelegate mAccessibilityDelegate; 3516 3517 /** 3518 * The view's overlay layer. Developers get a reference to the overlay via getOverlay() 3519 * and add/remove objects to/from the overlay directly through the Overlay methods. 3520 */ 3521 ViewOverlay mOverlay; 3522 3523 /** 3524 * The currently active parent view for receiving delegated nested scrolling events. 3525 * This is set by {@link #startNestedScroll(int)} during a touch interaction and cleared 3526 * by {@link #stopNestedScroll()} at the same point where we clear 3527 * requestDisallowInterceptTouchEvent. 3528 */ 3529 private ViewParent mNestedScrollingParent; 3530 3531 /** 3532 * Consistency verifier for debugging purposes. 3533 * @hide 3534 */ 3535 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3536 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3537 new InputEventConsistencyVerifier(this, 0) : null; 3538 3539 private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); 3540 3541 private int[] mTempNestedScrollConsumed; 3542 3543 /** 3544 * An overlay is going to draw this View instead of being drawn as part of this 3545 * View's parent. mGhostView is the View in the Overlay that must be invalidated 3546 * when this view is invalidated. 3547 */ 3548 GhostView mGhostView; 3549 3550 /** 3551 * Holds pairs of adjacent attribute data: attribute name followed by its value. 3552 * @hide 3553 */ 3554 @ViewDebug.ExportedProperty(category = "attributes", hasAdjacentMapping = true) 3555 public String[] mAttributes; 3556 3557 /** 3558 * Maps a Resource id to its name. 3559 */ 3560 private static SparseArray<String> mAttributeMap; 3561 3562 /** 3563 * Simple constructor to use when creating a view from code. 3564 * 3565 * @param context The Context the view is running in, through which it can 3566 * access the current theme, resources, etc. 3567 */ 3568 public View(Context context) { 3569 mContext = context; 3570 mResources = context != null ? context.getResources() : null; 3571 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3572 // Set some flags defaults 3573 mPrivateFlags2 = 3574 (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) | 3575 (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) | 3576 (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) | 3577 (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) | 3578 (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) | 3579 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3580 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3581 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3582 mUserPaddingStart = UNDEFINED_PADDING; 3583 mUserPaddingEnd = UNDEFINED_PADDING; 3584 mRenderNode = RenderNode.create(getClass().getName(), this); 3585 3586 if (!sCompatibilityDone && context != null) { 3587 final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; 3588 3589 // Older apps may need this compatibility hack for measurement. 3590 sUseBrokenMakeMeasureSpec = targetSdkVersion <= JELLY_BEAN_MR1; 3591 3592 // Older apps expect onMeasure() to always be called on a layout pass, regardless 3593 // of whether a layout was requested on that View. 3594 sIgnoreMeasureCache = targetSdkVersion < KITKAT; 3595 3596 sCompatibilityDone = true; 3597 } 3598 } 3599 3600 /** 3601 * Constructor that is called when inflating a view from XML. This is called 3602 * when a view is being constructed from an XML file, supplying attributes 3603 * that were specified in the XML file. This version uses a default style of 3604 * 0, so the only attribute values applied are those in the Context's Theme 3605 * and the given AttributeSet. 3606 * 3607 * <p> 3608 * The method onFinishInflate() will be called after all children have been 3609 * added. 3610 * 3611 * @param context The Context the view is running in, through which it can 3612 * access the current theme, resources, etc. 3613 * @param attrs The attributes of the XML tag that is inflating the view. 3614 * @see #View(Context, AttributeSet, int) 3615 */ 3616 public View(Context context, AttributeSet attrs) { 3617 this(context, attrs, 0); 3618 } 3619 3620 /** 3621 * Perform inflation from XML and apply a class-specific base style from a 3622 * theme attribute. This constructor of View allows subclasses to use their 3623 * own base style when they are inflating. For example, a Button class's 3624 * constructor would call this version of the super class constructor and 3625 * supply <code>R.attr.buttonStyle</code> for <var>defStyleAttr</var>; this 3626 * allows the theme's button style to modify all of the base view attributes 3627 * (in particular its background) as well as the Button class's attributes. 3628 * 3629 * @param context The Context the view is running in, through which it can 3630 * access the current theme, resources, etc. 3631 * @param attrs The attributes of the XML tag that is inflating the view. 3632 * @param defStyleAttr An attribute in the current theme that contains a 3633 * reference to a style resource that supplies default values for 3634 * the view. Can be 0 to not look for defaults. 3635 * @see #View(Context, AttributeSet) 3636 */ 3637 public View(Context context, AttributeSet attrs, int defStyleAttr) { 3638 this(context, attrs, defStyleAttr, 0); 3639 } 3640 3641 /** 3642 * Perform inflation from XML and apply a class-specific base style from a 3643 * theme attribute or style resource. This constructor of View allows 3644 * subclasses to use their own base style when they are inflating. 3645 * <p> 3646 * When determining the final value of a particular attribute, there are 3647 * four inputs that come into play: 3648 * <ol> 3649 * <li>Any attribute values in the given AttributeSet. 3650 * <li>The style resource specified in the AttributeSet (named "style"). 3651 * <li>The default style specified by <var>defStyleAttr</var>. 3652 * <li>The default style specified by <var>defStyleRes</var>. 3653 * <li>The base values in this theme. 3654 * </ol> 3655 * <p> 3656 * Each of these inputs is considered in-order, with the first listed taking 3657 * precedence over the following ones. In other words, if in the 3658 * AttributeSet you have supplied <code><Button * textColor="#ff000000"></code> 3659 * , then the button's text will <em>always</em> be black, regardless of 3660 * what is specified in any of the styles. 3661 * 3662 * @param context The Context the view is running in, through which it can 3663 * access the current theme, resources, etc. 3664 * @param attrs The attributes of the XML tag that is inflating the view. 3665 * @param defStyleAttr An attribute in the current theme that contains a 3666 * reference to a style resource that supplies default values for 3667 * the view. Can be 0 to not look for defaults. 3668 * @param defStyleRes A resource identifier of a style resource that 3669 * supplies default values for the view, used only if 3670 * defStyleAttr is 0 or can not be found in the theme. Can be 0 3671 * to not look for defaults. 3672 * @see #View(Context, AttributeSet, int) 3673 */ 3674 public View(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 3675 this(context); 3676 3677 final TypedArray a = context.obtainStyledAttributes( 3678 attrs, com.android.internal.R.styleable.View, defStyleAttr, defStyleRes); 3679 3680 if (mDebugViewAttributes) { 3681 saveAttributeData(attrs, a); 3682 } 3683 3684 Drawable background = null; 3685 3686 int leftPadding = -1; 3687 int topPadding = -1; 3688 int rightPadding = -1; 3689 int bottomPadding = -1; 3690 int startPadding = UNDEFINED_PADDING; 3691 int endPadding = UNDEFINED_PADDING; 3692 3693 int padding = -1; 3694 3695 int viewFlagValues = 0; 3696 int viewFlagMasks = 0; 3697 3698 boolean setScrollContainer = false; 3699 3700 int x = 0; 3701 int y = 0; 3702 3703 float tx = 0; 3704 float ty = 0; 3705 float tz = 0; 3706 float elevation = 0; 3707 float rotation = 0; 3708 float rotationX = 0; 3709 float rotationY = 0; 3710 float sx = 1f; 3711 float sy = 1f; 3712 boolean transformSet = false; 3713 3714 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3715 int overScrollMode = mOverScrollMode; 3716 boolean initializeScrollbars = false; 3717 3718 boolean startPaddingDefined = false; 3719 boolean endPaddingDefined = false; 3720 boolean leftPaddingDefined = false; 3721 boolean rightPaddingDefined = false; 3722 3723 final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; 3724 3725 final int N = a.getIndexCount(); 3726 for (int i = 0; i < N; i++) { 3727 int attr = a.getIndex(i); 3728 switch (attr) { 3729 case com.android.internal.R.styleable.View_background: 3730 background = a.getDrawable(attr); 3731 break; 3732 case com.android.internal.R.styleable.View_padding: 3733 padding = a.getDimensionPixelSize(attr, -1); 3734 mUserPaddingLeftInitial = padding; 3735 mUserPaddingRightInitial = padding; 3736 leftPaddingDefined = true; 3737 rightPaddingDefined = true; 3738 break; 3739 case com.android.internal.R.styleable.View_paddingLeft: 3740 leftPadding = a.getDimensionPixelSize(attr, -1); 3741 mUserPaddingLeftInitial = leftPadding; 3742 leftPaddingDefined = true; 3743 break; 3744 case com.android.internal.R.styleable.View_paddingTop: 3745 topPadding = a.getDimensionPixelSize(attr, -1); 3746 break; 3747 case com.android.internal.R.styleable.View_paddingRight: 3748 rightPadding = a.getDimensionPixelSize(attr, -1); 3749 mUserPaddingRightInitial = rightPadding; 3750 rightPaddingDefined = true; 3751 break; 3752 case com.android.internal.R.styleable.View_paddingBottom: 3753 bottomPadding = a.getDimensionPixelSize(attr, -1); 3754 break; 3755 case com.android.internal.R.styleable.View_paddingStart: 3756 startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3757 startPaddingDefined = (startPadding != UNDEFINED_PADDING); 3758 break; 3759 case com.android.internal.R.styleable.View_paddingEnd: 3760 endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3761 endPaddingDefined = (endPadding != UNDEFINED_PADDING); 3762 break; 3763 case com.android.internal.R.styleable.View_scrollX: 3764 x = a.getDimensionPixelOffset(attr, 0); 3765 break; 3766 case com.android.internal.R.styleable.View_scrollY: 3767 y = a.getDimensionPixelOffset(attr, 0); 3768 break; 3769 case com.android.internal.R.styleable.View_alpha: 3770 setAlpha(a.getFloat(attr, 1f)); 3771 break; 3772 case com.android.internal.R.styleable.View_transformPivotX: 3773 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3774 break; 3775 case com.android.internal.R.styleable.View_transformPivotY: 3776 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3777 break; 3778 case com.android.internal.R.styleable.View_translationX: 3779 tx = a.getDimensionPixelOffset(attr, 0); 3780 transformSet = true; 3781 break; 3782 case com.android.internal.R.styleable.View_translationY: 3783 ty = a.getDimensionPixelOffset(attr, 0); 3784 transformSet = true; 3785 break; 3786 case com.android.internal.R.styleable.View_translationZ: 3787 tz = a.getDimensionPixelOffset(attr, 0); 3788 transformSet = true; 3789 break; 3790 case com.android.internal.R.styleable.View_elevation: 3791 elevation = a.getDimensionPixelOffset(attr, 0); 3792 transformSet = true; 3793 break; 3794 case com.android.internal.R.styleable.View_rotation: 3795 rotation = a.getFloat(attr, 0); 3796 transformSet = true; 3797 break; 3798 case com.android.internal.R.styleable.View_rotationX: 3799 rotationX = a.getFloat(attr, 0); 3800 transformSet = true; 3801 break; 3802 case com.android.internal.R.styleable.View_rotationY: 3803 rotationY = a.getFloat(attr, 0); 3804 transformSet = true; 3805 break; 3806 case com.android.internal.R.styleable.View_scaleX: 3807 sx = a.getFloat(attr, 1f); 3808 transformSet = true; 3809 break; 3810 case com.android.internal.R.styleable.View_scaleY: 3811 sy = a.getFloat(attr, 1f); 3812 transformSet = true; 3813 break; 3814 case com.android.internal.R.styleable.View_id: 3815 mID = a.getResourceId(attr, NO_ID); 3816 break; 3817 case com.android.internal.R.styleable.View_tag: 3818 mTag = a.getText(attr); 3819 break; 3820 case com.android.internal.R.styleable.View_fitsSystemWindows: 3821 if (a.getBoolean(attr, false)) { 3822 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3823 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3824 } 3825 break; 3826 case com.android.internal.R.styleable.View_focusable: 3827 if (a.getBoolean(attr, false)) { 3828 viewFlagValues |= FOCUSABLE; 3829 viewFlagMasks |= FOCUSABLE_MASK; 3830 } 3831 break; 3832 case com.android.internal.R.styleable.View_focusableInTouchMode: 3833 if (a.getBoolean(attr, false)) { 3834 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3835 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3836 } 3837 break; 3838 case com.android.internal.R.styleable.View_clickable: 3839 if (a.getBoolean(attr, false)) { 3840 viewFlagValues |= CLICKABLE; 3841 viewFlagMasks |= CLICKABLE; 3842 } 3843 break; 3844 case com.android.internal.R.styleable.View_longClickable: 3845 if (a.getBoolean(attr, false)) { 3846 viewFlagValues |= LONG_CLICKABLE; 3847 viewFlagMasks |= LONG_CLICKABLE; 3848 } 3849 break; 3850 case com.android.internal.R.styleable.View_saveEnabled: 3851 if (!a.getBoolean(attr, true)) { 3852 viewFlagValues |= SAVE_DISABLED; 3853 viewFlagMasks |= SAVE_DISABLED_MASK; 3854 } 3855 break; 3856 case com.android.internal.R.styleable.View_duplicateParentState: 3857 if (a.getBoolean(attr, false)) { 3858 viewFlagValues |= DUPLICATE_PARENT_STATE; 3859 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3860 } 3861 break; 3862 case com.android.internal.R.styleable.View_visibility: 3863 final int visibility = a.getInt(attr, 0); 3864 if (visibility != 0) { 3865 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3866 viewFlagMasks |= VISIBILITY_MASK; 3867 } 3868 break; 3869 case com.android.internal.R.styleable.View_layoutDirection: 3870 // Clear any layout direction flags (included resolved bits) already set 3871 mPrivateFlags2 &= 3872 ~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK); 3873 // Set the layout direction flags depending on the value of the attribute 3874 final int layoutDirection = a.getInt(attr, -1); 3875 final int value = (layoutDirection != -1) ? 3876 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3877 mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT); 3878 break; 3879 case com.android.internal.R.styleable.View_drawingCacheQuality: 3880 final int cacheQuality = a.getInt(attr, 0); 3881 if (cacheQuality != 0) { 3882 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3883 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3884 } 3885 break; 3886 case com.android.internal.R.styleable.View_contentDescription: 3887 setContentDescription(a.getString(attr)); 3888 break; 3889 case com.android.internal.R.styleable.View_labelFor: 3890 setLabelFor(a.getResourceId(attr, NO_ID)); 3891 break; 3892 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3893 if (!a.getBoolean(attr, true)) { 3894 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3895 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3896 } 3897 break; 3898 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3899 if (!a.getBoolean(attr, true)) { 3900 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3901 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3902 } 3903 break; 3904 case R.styleable.View_scrollbars: 3905 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3906 if (scrollbars != SCROLLBARS_NONE) { 3907 viewFlagValues |= scrollbars; 3908 viewFlagMasks |= SCROLLBARS_MASK; 3909 initializeScrollbars = true; 3910 } 3911 break; 3912 //noinspection deprecation 3913 case R.styleable.View_fadingEdge: 3914 if (targetSdkVersion >= ICE_CREAM_SANDWICH) { 3915 // Ignore the attribute starting with ICS 3916 break; 3917 } 3918 // With builds < ICS, fall through and apply fading edges 3919 case R.styleable.View_requiresFadingEdge: 3920 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3921 if (fadingEdge != FADING_EDGE_NONE) { 3922 viewFlagValues |= fadingEdge; 3923 viewFlagMasks |= FADING_EDGE_MASK; 3924 initializeFadingEdgeInternal(a); 3925 } 3926 break; 3927 case R.styleable.View_scrollbarStyle: 3928 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3929 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3930 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3931 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3932 } 3933 break; 3934 case R.styleable.View_isScrollContainer: 3935 setScrollContainer = true; 3936 if (a.getBoolean(attr, false)) { 3937 setScrollContainer(true); 3938 } 3939 break; 3940 case com.android.internal.R.styleable.View_keepScreenOn: 3941 if (a.getBoolean(attr, false)) { 3942 viewFlagValues |= KEEP_SCREEN_ON; 3943 viewFlagMasks |= KEEP_SCREEN_ON; 3944 } 3945 break; 3946 case R.styleable.View_filterTouchesWhenObscured: 3947 if (a.getBoolean(attr, false)) { 3948 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3949 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3950 } 3951 break; 3952 case R.styleable.View_nextFocusLeft: 3953 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3954 break; 3955 case R.styleable.View_nextFocusRight: 3956 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3957 break; 3958 case R.styleable.View_nextFocusUp: 3959 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3960 break; 3961 case R.styleable.View_nextFocusDown: 3962 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3963 break; 3964 case R.styleable.View_nextFocusForward: 3965 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3966 break; 3967 case R.styleable.View_minWidth: 3968 mMinWidth = a.getDimensionPixelSize(attr, 0); 3969 break; 3970 case R.styleable.View_minHeight: 3971 mMinHeight = a.getDimensionPixelSize(attr, 0); 3972 break; 3973 case R.styleable.View_onClick: 3974 if (context.isRestricted()) { 3975 throw new IllegalStateException("The android:onClick attribute cannot " 3976 + "be used within a restricted context"); 3977 } 3978 3979 final String handlerName = a.getString(attr); 3980 if (handlerName != null) { 3981 setOnClickListener(new OnClickListener() { 3982 private Method mHandler; 3983 3984 public void onClick(View v) { 3985 if (mHandler == null) { 3986 try { 3987 mHandler = getContext().getClass().getMethod(handlerName, 3988 View.class); 3989 } catch (NoSuchMethodException e) { 3990 int id = getId(); 3991 String idText = id == NO_ID ? "" : " with id '" 3992 + getContext().getResources().getResourceEntryName( 3993 id) + "'"; 3994 throw new IllegalStateException("Could not find a method " + 3995 handlerName + "(View) in the activity " 3996 + getContext().getClass() + " for onClick handler" 3997 + " on view " + View.this.getClass() + idText, e); 3998 } 3999 } 4000 4001 try { 4002 mHandler.invoke(getContext(), View.this); 4003 } catch (IllegalAccessException e) { 4004 throw new IllegalStateException("Could not execute non " 4005 + "public method of the activity", e); 4006 } catch (InvocationTargetException e) { 4007 throw new IllegalStateException("Could not execute " 4008 + "method of the activity", e); 4009 } 4010 } 4011 }); 4012 } 4013 break; 4014 case R.styleable.View_overScrollMode: 4015 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 4016 break; 4017 case R.styleable.View_verticalScrollbarPosition: 4018 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 4019 break; 4020 case R.styleable.View_layerType: 4021 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 4022 break; 4023 case R.styleable.View_textDirection: 4024 // Clear any text direction flag already set 4025 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 4026 // Set the text direction flags depending on the value of the attribute 4027 final int textDirection = a.getInt(attr, -1); 4028 if (textDirection != -1) { 4029 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection]; 4030 } 4031 break; 4032 case R.styleable.View_textAlignment: 4033 // Clear any text alignment flag already set 4034 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 4035 // Set the text alignment flag depending on the value of the attribute 4036 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 4037 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment]; 4038 break; 4039 case R.styleable.View_importantForAccessibility: 4040 setImportantForAccessibility(a.getInt(attr, 4041 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 4042 break; 4043 case R.styleable.View_accessibilityLiveRegion: 4044 setAccessibilityLiveRegion(a.getInt(attr, ACCESSIBILITY_LIVE_REGION_DEFAULT)); 4045 break; 4046 case R.styleable.View_transitionName: 4047 setTransitionName(a.getString(attr)); 4048 break; 4049 case R.styleable.View_nestedScrollingEnabled: 4050 setNestedScrollingEnabled(a.getBoolean(attr, false)); 4051 break; 4052 case R.styleable.View_stateListAnimator: 4053 setStateListAnimator(AnimatorInflater.loadStateListAnimator(context, 4054 a.getResourceId(attr, 0))); 4055 break; 4056 case R.styleable.View_backgroundTint: 4057 // This will get applied later during setBackground(). 4058 if (mBackgroundTint == null) { 4059 mBackgroundTint = new TintInfo(); 4060 } 4061 mBackgroundTint.mTintList = a.getColorStateList( 4062 R.styleable.View_backgroundTint); 4063 mBackgroundTint.mHasTintList = true; 4064 break; 4065 case R.styleable.View_backgroundTintMode: 4066 // This will get applied later during setBackground(). 4067 if (mBackgroundTint == null) { 4068 mBackgroundTint = new TintInfo(); 4069 } 4070 mBackgroundTint.mTintMode = Drawable.parseTintMode(a.getInt( 4071 R.styleable.View_backgroundTintMode, -1), null); 4072 mBackgroundTint.mHasTintMode = true; 4073 break; 4074 case R.styleable.View_outlineProvider: 4075 setOutlineProviderFromAttribute(a.getInt(R.styleable.View_outlineProvider, 4076 PROVIDER_BACKGROUND)); 4077 break; 4078 } 4079 } 4080 4081 setOverScrollMode(overScrollMode); 4082 4083 // Cache start/end user padding as we cannot fully resolve padding here (we dont have yet 4084 // the resolved layout direction). Those cached values will be used later during padding 4085 // resolution. 4086 mUserPaddingStart = startPadding; 4087 mUserPaddingEnd = endPadding; 4088 4089 if (background != null) { 4090 setBackground(background); 4091 } 4092 4093 // setBackground above will record that padding is currently provided by the background. 4094 // If we have padding specified via xml, record that here instead and use it. 4095 mLeftPaddingDefined = leftPaddingDefined; 4096 mRightPaddingDefined = rightPaddingDefined; 4097 4098 if (padding >= 0) { 4099 leftPadding = padding; 4100 topPadding = padding; 4101 rightPadding = padding; 4102 bottomPadding = padding; 4103 mUserPaddingLeftInitial = padding; 4104 mUserPaddingRightInitial = padding; 4105 } 4106 4107 if (isRtlCompatibilityMode()) { 4108 // RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case. 4109 // left / right padding are used if defined (meaning here nothing to do). If they are not 4110 // defined and start / end padding are defined (e.g. in Frameworks resources), then we use 4111 // start / end and resolve them as left / right (layout direction is not taken into account). 4112 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 4113 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 4114 // defined. 4115 if (!mLeftPaddingDefined && startPaddingDefined) { 4116 leftPadding = startPadding; 4117 } 4118 mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial; 4119 if (!mRightPaddingDefined && endPaddingDefined) { 4120 rightPadding = endPadding; 4121 } 4122 mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial; 4123 } else { 4124 // Jelly Bean MR1 and after case: if start/end defined, they will override any left/right 4125 // values defined. Otherwise, left /right values are used. 4126 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 4127 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 4128 // defined. 4129 final boolean hasRelativePadding = startPaddingDefined || endPaddingDefined; 4130 4131 if (mLeftPaddingDefined && !hasRelativePadding) { 4132 mUserPaddingLeftInitial = leftPadding; 4133 } 4134 if (mRightPaddingDefined && !hasRelativePadding) { 4135 mUserPaddingRightInitial = rightPadding; 4136 } 4137 } 4138 4139 internalSetPadding( 4140 mUserPaddingLeftInitial, 4141 topPadding >= 0 ? topPadding : mPaddingTop, 4142 mUserPaddingRightInitial, 4143 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 4144 4145 if (viewFlagMasks != 0) { 4146 setFlags(viewFlagValues, viewFlagMasks); 4147 } 4148 4149 if (initializeScrollbars) { 4150 initializeScrollbarsInternal(a); 4151 } 4152 4153 a.recycle(); 4154 4155 // Needs to be called after mViewFlags is set 4156 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 4157 recomputePadding(); 4158 } 4159 4160 if (x != 0 || y != 0) { 4161 scrollTo(x, y); 4162 } 4163 4164 if (transformSet) { 4165 setTranslationX(tx); 4166 setTranslationY(ty); 4167 setTranslationZ(tz); 4168 setElevation(elevation); 4169 setRotation(rotation); 4170 setRotationX(rotationX); 4171 setRotationY(rotationY); 4172 setScaleX(sx); 4173 setScaleY(sy); 4174 } 4175 4176 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 4177 setScrollContainer(true); 4178 } 4179 4180 computeOpaqueFlags(); 4181 } 4182 4183 /** 4184 * Non-public constructor for use in testing 4185 */ 4186 View() { 4187 mResources = null; 4188 mRenderNode = RenderNode.create(getClass().getName(), this); 4189 } 4190 4191 private static SparseArray<String> getAttributeMap() { 4192 if (mAttributeMap == null) { 4193 mAttributeMap = new SparseArray<String>(); 4194 } 4195 return mAttributeMap; 4196 } 4197 4198 private void saveAttributeData(AttributeSet attrs, TypedArray a) { 4199 int length = ((attrs == null ? 0 : attrs.getAttributeCount()) + a.getIndexCount()) * 2; 4200 mAttributes = new String[length]; 4201 4202 int i = 0; 4203 if (attrs != null) { 4204 for (i = 0; i < attrs.getAttributeCount(); i += 2) { 4205 mAttributes[i] = attrs.getAttributeName(i); 4206 mAttributes[i + 1] = attrs.getAttributeValue(i); 4207 } 4208 4209 } 4210 4211 SparseArray<String> attributeMap = getAttributeMap(); 4212 for (int j = 0; j < a.length(); ++j) { 4213 if (a.hasValue(j)) { 4214 try { 4215 int resourceId = a.getResourceId(j, 0); 4216 if (resourceId == 0) { 4217 continue; 4218 } 4219 4220 String resourceName = attributeMap.get(resourceId); 4221 if (resourceName == null) { 4222 resourceName = a.getResources().getResourceName(resourceId); 4223 attributeMap.put(resourceId, resourceName); 4224 } 4225 4226 mAttributes[i] = resourceName; 4227 mAttributes[i + 1] = a.getText(j).toString(); 4228 i += 2; 4229 } catch (Resources.NotFoundException e) { 4230 // if we can't get the resource name, we just ignore it 4231 } 4232 } 4233 } 4234 } 4235 4236 public String toString() { 4237 StringBuilder out = new StringBuilder(128); 4238 out.append(getClass().getName()); 4239 out.append('{'); 4240 out.append(Integer.toHexString(System.identityHashCode(this))); 4241 out.append(' '); 4242 switch (mViewFlags&VISIBILITY_MASK) { 4243 case VISIBLE: out.append('V'); break; 4244 case INVISIBLE: out.append('I'); break; 4245 case GONE: out.append('G'); break; 4246 default: out.append('.'); break; 4247 } 4248 out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.'); 4249 out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.'); 4250 out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D'); 4251 out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.'); 4252 out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.'); 4253 out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.'); 4254 out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.'); 4255 out.append(' '); 4256 out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.'); 4257 out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.'); 4258 out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.'); 4259 if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) { 4260 out.append('p'); 4261 } else { 4262 out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.'); 4263 } 4264 out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.'); 4265 out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.'); 4266 out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.'); 4267 out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.'); 4268 out.append(' '); 4269 out.append(mLeft); 4270 out.append(','); 4271 out.append(mTop); 4272 out.append('-'); 4273 out.append(mRight); 4274 out.append(','); 4275 out.append(mBottom); 4276 final int id = getId(); 4277 if (id != NO_ID) { 4278 out.append(" #"); 4279 out.append(Integer.toHexString(id)); 4280 final Resources r = mResources; 4281 if (Resources.resourceHasPackage(id) && r != null) { 4282 try { 4283 String pkgname; 4284 switch (id&0xff000000) { 4285 case 0x7f000000: 4286 pkgname="app"; 4287 break; 4288 case 0x01000000: 4289 pkgname="android"; 4290 break; 4291 default: 4292 pkgname = r.getResourcePackageName(id); 4293 break; 4294 } 4295 String typename = r.getResourceTypeName(id); 4296 String entryname = r.getResourceEntryName(id); 4297 out.append(" "); 4298 out.append(pkgname); 4299 out.append(":"); 4300 out.append(typename); 4301 out.append("/"); 4302 out.append(entryname); 4303 } catch (Resources.NotFoundException e) { 4304 } 4305 } 4306 } 4307 out.append("}"); 4308 return out.toString(); 4309 } 4310 4311 /** 4312 * <p> 4313 * Initializes the fading edges from a given set of styled attributes. This 4314 * method should be called by subclasses that need fading edges and when an 4315 * instance of these subclasses is created programmatically rather than 4316 * being inflated from XML. This method is automatically called when the XML 4317 * is inflated. 4318 * </p> 4319 * 4320 * @param a the styled attributes set to initialize the fading edges from 4321 * 4322 * @removed 4323 */ 4324 protected void initializeFadingEdge(TypedArray a) { 4325 // This method probably shouldn't have been included in the SDK to begin with. 4326 // It relies on 'a' having been initialized using an attribute filter array that is 4327 // not publicly available to the SDK. The old method has been renamed 4328 // to initializeFadingEdgeInternal and hidden for framework use only; 4329 // this one initializes using defaults to make it safe to call for apps. 4330 4331 TypedArray arr = mContext.obtainStyledAttributes(com.android.internal.R.styleable.View); 4332 4333 initializeFadingEdgeInternal(arr); 4334 4335 arr.recycle(); 4336 } 4337 4338 /** 4339 * <p> 4340 * Initializes the fading edges from a given set of styled attributes. This 4341 * method should be called by subclasses that need fading edges and when an 4342 * instance of these subclasses is created programmatically rather than 4343 * being inflated from XML. This method is automatically called when the XML 4344 * is inflated. 4345 * </p> 4346 * 4347 * @param a the styled attributes set to initialize the fading edges from 4348 * @hide This is the real method; the public one is shimmed to be safe to call from apps. 4349 */ 4350 protected void initializeFadingEdgeInternal(TypedArray a) { 4351 initScrollCache(); 4352 4353 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 4354 R.styleable.View_fadingEdgeLength, 4355 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 4356 } 4357 4358 /** 4359 * Returns the size of the vertical faded edges used to indicate that more 4360 * content in this view is visible. 4361 * 4362 * @return The size in pixels of the vertical faded edge or 0 if vertical 4363 * faded edges are not enabled for this view. 4364 * @attr ref android.R.styleable#View_fadingEdgeLength 4365 */ 4366 public int getVerticalFadingEdgeLength() { 4367 if (isVerticalFadingEdgeEnabled()) { 4368 ScrollabilityCache cache = mScrollCache; 4369 if (cache != null) { 4370 return cache.fadingEdgeLength; 4371 } 4372 } 4373 return 0; 4374 } 4375 4376 /** 4377 * Set the size of the faded edge used to indicate that more content in this 4378 * view is available. Will not change whether the fading edge is enabled; use 4379 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 4380 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 4381 * for the vertical or horizontal fading edges. 4382 * 4383 * @param length The size in pixels of the faded edge used to indicate that more 4384 * content in this view is visible. 4385 */ 4386 public void setFadingEdgeLength(int length) { 4387 initScrollCache(); 4388 mScrollCache.fadingEdgeLength = length; 4389 } 4390 4391 /** 4392 * Returns the size of the horizontal faded edges used to indicate that more 4393 * content in this view is visible. 4394 * 4395 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 4396 * faded edges are not enabled for this view. 4397 * @attr ref android.R.styleable#View_fadingEdgeLength 4398 */ 4399 public int getHorizontalFadingEdgeLength() { 4400 if (isHorizontalFadingEdgeEnabled()) { 4401 ScrollabilityCache cache = mScrollCache; 4402 if (cache != null) { 4403 return cache.fadingEdgeLength; 4404 } 4405 } 4406 return 0; 4407 } 4408 4409 /** 4410 * Returns the width of the vertical scrollbar. 4411 * 4412 * @return The width in pixels of the vertical scrollbar or 0 if there 4413 * is no vertical scrollbar. 4414 */ 4415 public int getVerticalScrollbarWidth() { 4416 ScrollabilityCache cache = mScrollCache; 4417 if (cache != null) { 4418 ScrollBarDrawable scrollBar = cache.scrollBar; 4419 if (scrollBar != null) { 4420 int size = scrollBar.getSize(true); 4421 if (size <= 0) { 4422 size = cache.scrollBarSize; 4423 } 4424 return size; 4425 } 4426 return 0; 4427 } 4428 return 0; 4429 } 4430 4431 /** 4432 * Returns the height of the horizontal scrollbar. 4433 * 4434 * @return The height in pixels of the horizontal scrollbar or 0 if 4435 * there is no horizontal scrollbar. 4436 */ 4437 protected int getHorizontalScrollbarHeight() { 4438 ScrollabilityCache cache = mScrollCache; 4439 if (cache != null) { 4440 ScrollBarDrawable scrollBar = cache.scrollBar; 4441 if (scrollBar != null) { 4442 int size = scrollBar.getSize(false); 4443 if (size <= 0) { 4444 size = cache.scrollBarSize; 4445 } 4446 return size; 4447 } 4448 return 0; 4449 } 4450 return 0; 4451 } 4452 4453 /** 4454 * <p> 4455 * Initializes the scrollbars from a given set of styled attributes. This 4456 * method should be called by subclasses that need scrollbars and when an 4457 * instance of these subclasses is created programmatically rather than 4458 * being inflated from XML. This method is automatically called when the XML 4459 * is inflated. 4460 * </p> 4461 * 4462 * @param a the styled attributes set to initialize the scrollbars from 4463 * 4464 * @removed 4465 */ 4466 protected void initializeScrollbars(TypedArray a) { 4467 // It's not safe to use this method from apps. The parameter 'a' must have been obtained 4468 // using the View filter array which is not available to the SDK. As such, internal 4469 // framework usage now uses initializeScrollbarsInternal and we grab a default 4470 // TypedArray with the right filter instead here. 4471 TypedArray arr = mContext.obtainStyledAttributes(com.android.internal.R.styleable.View); 4472 4473 initializeScrollbarsInternal(arr); 4474 4475 // We ignored the method parameter. Recycle the one we actually did use. 4476 arr.recycle(); 4477 } 4478 4479 /** 4480 * <p> 4481 * Initializes the scrollbars from a given set of styled attributes. This 4482 * method should be called by subclasses that need scrollbars and when an 4483 * instance of these subclasses is created programmatically rather than 4484 * being inflated from XML. This method is automatically called when the XML 4485 * is inflated. 4486 * </p> 4487 * 4488 * @param a the styled attributes set to initialize the scrollbars from 4489 * @hide 4490 */ 4491 protected void initializeScrollbarsInternal(TypedArray a) { 4492 initScrollCache(); 4493 4494 final ScrollabilityCache scrollabilityCache = mScrollCache; 4495 4496 if (scrollabilityCache.scrollBar == null) { 4497 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 4498 } 4499 4500 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 4501 4502 if (!fadeScrollbars) { 4503 scrollabilityCache.state = ScrollabilityCache.ON; 4504 } 4505 scrollabilityCache.fadeScrollBars = fadeScrollbars; 4506 4507 4508 scrollabilityCache.scrollBarFadeDuration = a.getInt( 4509 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 4510 .getScrollBarFadeDuration()); 4511 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 4512 R.styleable.View_scrollbarDefaultDelayBeforeFade, 4513 ViewConfiguration.getScrollDefaultDelay()); 4514 4515 4516 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 4517 com.android.internal.R.styleable.View_scrollbarSize, 4518 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 4519 4520 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 4521 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 4522 4523 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 4524 if (thumb != null) { 4525 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 4526 } 4527 4528 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 4529 false); 4530 if (alwaysDraw) { 4531 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 4532 } 4533 4534 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 4535 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 4536 4537 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 4538 if (thumb != null) { 4539 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 4540 } 4541 4542 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 4543 false); 4544 if (alwaysDraw) { 4545 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 4546 } 4547 4548 // Apply layout direction to the new Drawables if needed 4549 final int layoutDirection = getLayoutDirection(); 4550 if (track != null) { 4551 track.setLayoutDirection(layoutDirection); 4552 } 4553 if (thumb != null) { 4554 thumb.setLayoutDirection(layoutDirection); 4555 } 4556 4557 // Re-apply user/background padding so that scrollbar(s) get added 4558 resolvePadding(); 4559 } 4560 4561 /** 4562 * <p> 4563 * Initalizes the scrollability cache if necessary. 4564 * </p> 4565 */ 4566 private void initScrollCache() { 4567 if (mScrollCache == null) { 4568 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 4569 } 4570 } 4571 4572 private ScrollabilityCache getScrollCache() { 4573 initScrollCache(); 4574 return mScrollCache; 4575 } 4576 4577 /** 4578 * Set the position of the vertical scroll bar. Should be one of 4579 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 4580 * {@link #SCROLLBAR_POSITION_RIGHT}. 4581 * 4582 * @param position Where the vertical scroll bar should be positioned. 4583 */ 4584 public void setVerticalScrollbarPosition(int position) { 4585 if (mVerticalScrollbarPosition != position) { 4586 mVerticalScrollbarPosition = position; 4587 computeOpaqueFlags(); 4588 resolvePadding(); 4589 } 4590 } 4591 4592 /** 4593 * @return The position where the vertical scroll bar will show, if applicable. 4594 * @see #setVerticalScrollbarPosition(int) 4595 */ 4596 public int getVerticalScrollbarPosition() { 4597 return mVerticalScrollbarPosition; 4598 } 4599 4600 ListenerInfo getListenerInfo() { 4601 if (mListenerInfo != null) { 4602 return mListenerInfo; 4603 } 4604 mListenerInfo = new ListenerInfo(); 4605 return mListenerInfo; 4606 } 4607 4608 /** 4609 * Register a callback to be invoked when focus of this view changed. 4610 * 4611 * @param l The callback that will run. 4612 */ 4613 public void setOnFocusChangeListener(OnFocusChangeListener l) { 4614 getListenerInfo().mOnFocusChangeListener = l; 4615 } 4616 4617 /** 4618 * Add a listener that will be called when the bounds of the view change due to 4619 * layout processing. 4620 * 4621 * @param listener The listener that will be called when layout bounds change. 4622 */ 4623 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 4624 ListenerInfo li = getListenerInfo(); 4625 if (li.mOnLayoutChangeListeners == null) { 4626 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 4627 } 4628 if (!li.mOnLayoutChangeListeners.contains(listener)) { 4629 li.mOnLayoutChangeListeners.add(listener); 4630 } 4631 } 4632 4633 /** 4634 * Remove a listener for layout changes. 4635 * 4636 * @param listener The listener for layout bounds change. 4637 */ 4638 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 4639 ListenerInfo li = mListenerInfo; 4640 if (li == null || li.mOnLayoutChangeListeners == null) { 4641 return; 4642 } 4643 li.mOnLayoutChangeListeners.remove(listener); 4644 } 4645 4646 /** 4647 * Add a listener for attach state changes. 4648 * 4649 * This listener will be called whenever this view is attached or detached 4650 * from a window. Remove the listener using 4651 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 4652 * 4653 * @param listener Listener to attach 4654 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 4655 */ 4656 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4657 ListenerInfo li = getListenerInfo(); 4658 if (li.mOnAttachStateChangeListeners == null) { 4659 li.mOnAttachStateChangeListeners 4660 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 4661 } 4662 li.mOnAttachStateChangeListeners.add(listener); 4663 } 4664 4665 /** 4666 * Remove a listener for attach state changes. The listener will receive no further 4667 * notification of window attach/detach events. 4668 * 4669 * @param listener Listener to remove 4670 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 4671 */ 4672 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4673 ListenerInfo li = mListenerInfo; 4674 if (li == null || li.mOnAttachStateChangeListeners == null) { 4675 return; 4676 } 4677 li.mOnAttachStateChangeListeners.remove(listener); 4678 } 4679 4680 /** 4681 * Returns the focus-change callback registered for this view. 4682 * 4683 * @return The callback, or null if one is not registered. 4684 */ 4685 public OnFocusChangeListener getOnFocusChangeListener() { 4686 ListenerInfo li = mListenerInfo; 4687 return li != null ? li.mOnFocusChangeListener : null; 4688 } 4689 4690 /** 4691 * Register a callback to be invoked when this view is clicked. If this view is not 4692 * clickable, it becomes clickable. 4693 * 4694 * @param l The callback that will run 4695 * 4696 * @see #setClickable(boolean) 4697 */ 4698 public void setOnClickListener(OnClickListener l) { 4699 if (!isClickable()) { 4700 setClickable(true); 4701 } 4702 getListenerInfo().mOnClickListener = l; 4703 } 4704 4705 /** 4706 * Return whether this view has an attached OnClickListener. Returns 4707 * true if there is a listener, false if there is none. 4708 */ 4709 public boolean hasOnClickListeners() { 4710 ListenerInfo li = mListenerInfo; 4711 return (li != null && li.mOnClickListener != null); 4712 } 4713 4714 /** 4715 * Register a callback to be invoked when this view is clicked and held. If this view is not 4716 * long clickable, it becomes long clickable. 4717 * 4718 * @param l The callback that will run 4719 * 4720 * @see #setLongClickable(boolean) 4721 */ 4722 public void setOnLongClickListener(OnLongClickListener l) { 4723 if (!isLongClickable()) { 4724 setLongClickable(true); 4725 } 4726 getListenerInfo().mOnLongClickListener = l; 4727 } 4728 4729 /** 4730 * Register a callback to be invoked when the context menu for this view is 4731 * being built. If this view is not long clickable, it becomes long clickable. 4732 * 4733 * @param l The callback that will run 4734 * 4735 */ 4736 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 4737 if (!isLongClickable()) { 4738 setLongClickable(true); 4739 } 4740 getListenerInfo().mOnCreateContextMenuListener = l; 4741 } 4742 4743 /** 4744 * Call this view's OnClickListener, if it is defined. Performs all normal 4745 * actions associated with clicking: reporting accessibility event, playing 4746 * a sound, etc. 4747 * 4748 * @return True there was an assigned OnClickListener that was called, false 4749 * otherwise is returned. 4750 */ 4751 public boolean performClick() { 4752 final boolean result; 4753 final ListenerInfo li = mListenerInfo; 4754 if (li != null && li.mOnClickListener != null) { 4755 playSoundEffect(SoundEffectConstants.CLICK); 4756 li.mOnClickListener.onClick(this); 4757 result = true; 4758 } else { 4759 result = false; 4760 } 4761 4762 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 4763 return result; 4764 } 4765 4766 /** 4767 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 4768 * this only calls the listener, and does not do any associated clicking 4769 * actions like reporting an accessibility event. 4770 * 4771 * @return True there was an assigned OnClickListener that was called, false 4772 * otherwise is returned. 4773 */ 4774 public boolean callOnClick() { 4775 ListenerInfo li = mListenerInfo; 4776 if (li != null && li.mOnClickListener != null) { 4777 li.mOnClickListener.onClick(this); 4778 return true; 4779 } 4780 return false; 4781 } 4782 4783 /** 4784 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 4785 * OnLongClickListener did not consume the event. 4786 * 4787 * @return True if one of the above receivers consumed the event, false otherwise. 4788 */ 4789 public boolean performLongClick() { 4790 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4791 4792 boolean handled = false; 4793 ListenerInfo li = mListenerInfo; 4794 if (li != null && li.mOnLongClickListener != null) { 4795 handled = li.mOnLongClickListener.onLongClick(View.this); 4796 } 4797 if (!handled) { 4798 handled = showContextMenu(); 4799 } 4800 if (handled) { 4801 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4802 } 4803 return handled; 4804 } 4805 4806 /** 4807 * Performs button-related actions during a touch down event. 4808 * 4809 * @param event The event. 4810 * @return True if the down was consumed. 4811 * 4812 * @hide 4813 */ 4814 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4815 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4816 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4817 return true; 4818 } 4819 } 4820 return false; 4821 } 4822 4823 /** 4824 * Bring up the context menu for this view. 4825 * 4826 * @return Whether a context menu was displayed. 4827 */ 4828 public boolean showContextMenu() { 4829 return getParent().showContextMenuForChild(this); 4830 } 4831 4832 /** 4833 * Bring up the context menu for this view, referring to the item under the specified point. 4834 * 4835 * @param x The referenced x coordinate. 4836 * @param y The referenced y coordinate. 4837 * @param metaState The keyboard modifiers that were pressed. 4838 * @return Whether a context menu was displayed. 4839 * 4840 * @hide 4841 */ 4842 public boolean showContextMenu(float x, float y, int metaState) { 4843 return showContextMenu(); 4844 } 4845 4846 /** 4847 * Start an action mode. 4848 * 4849 * @param callback Callback that will control the lifecycle of the action mode 4850 * @return The new action mode if it is started, null otherwise 4851 * 4852 * @see ActionMode 4853 */ 4854 public ActionMode startActionMode(ActionMode.Callback callback) { 4855 ViewParent parent = getParent(); 4856 if (parent == null) return null; 4857 return parent.startActionModeForChild(this, callback); 4858 } 4859 4860 /** 4861 * Register a callback to be invoked when a hardware key is pressed in this view. 4862 * Key presses in software input methods will generally not trigger the methods of 4863 * this listener. 4864 * @param l the key listener to attach to this view 4865 */ 4866 public void setOnKeyListener(OnKeyListener l) { 4867 getListenerInfo().mOnKeyListener = l; 4868 } 4869 4870 /** 4871 * Register a callback to be invoked when a touch event is sent to this view. 4872 * @param l the touch listener to attach to this view 4873 */ 4874 public void setOnTouchListener(OnTouchListener l) { 4875 getListenerInfo().mOnTouchListener = l; 4876 } 4877 4878 /** 4879 * Register a callback to be invoked when a generic motion event is sent to this view. 4880 * @param l the generic motion listener to attach to this view 4881 */ 4882 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4883 getListenerInfo().mOnGenericMotionListener = l; 4884 } 4885 4886 /** 4887 * Register a callback to be invoked when a hover event is sent to this view. 4888 * @param l the hover listener to attach to this view 4889 */ 4890 public void setOnHoverListener(OnHoverListener l) { 4891 getListenerInfo().mOnHoverListener = l; 4892 } 4893 4894 /** 4895 * Register a drag event listener callback object for this View. The parameter is 4896 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4897 * View, the system calls the 4898 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4899 * @param l An implementation of {@link android.view.View.OnDragListener}. 4900 */ 4901 public void setOnDragListener(OnDragListener l) { 4902 getListenerInfo().mOnDragListener = l; 4903 } 4904 4905 /** 4906 * Give this view focus. This will cause 4907 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4908 * 4909 * Note: this does not check whether this {@link View} should get focus, it just 4910 * gives it focus no matter what. It should only be called internally by framework 4911 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4912 * 4913 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4914 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4915 * focus moved when requestFocus() is called. It may not always 4916 * apply, in which case use the default View.FOCUS_DOWN. 4917 * @param previouslyFocusedRect The rectangle of the view that had focus 4918 * prior in this View's coordinate system. 4919 */ 4920 void handleFocusGainInternal(@FocusRealDirection int direction, Rect previouslyFocusedRect) { 4921 if (DBG) { 4922 System.out.println(this + " requestFocus()"); 4923 } 4924 4925 if ((mPrivateFlags & PFLAG_FOCUSED) == 0) { 4926 mPrivateFlags |= PFLAG_FOCUSED; 4927 4928 View oldFocus = (mAttachInfo != null) ? getRootView().findFocus() : null; 4929 4930 if (mParent != null) { 4931 mParent.requestChildFocus(this, this); 4932 } 4933 4934 if (mAttachInfo != null) { 4935 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, this); 4936 } 4937 4938 onFocusChanged(true, direction, previouslyFocusedRect); 4939 refreshDrawableState(); 4940 } 4941 } 4942 4943 /** 4944 * Populates <code>outRect</code> with the hotspot bounds. By default, 4945 * the hotspot bounds are identical to the screen bounds. 4946 * 4947 * @param outRect rect to populate with hotspot bounds 4948 * @hide Only for internal use by views and widgets. 4949 */ 4950 public void getHotspotBounds(Rect outRect) { 4951 final Drawable background = getBackground(); 4952 if (background != null) { 4953 background.getHotspotBounds(outRect); 4954 } else { 4955 getBoundsOnScreen(outRect); 4956 } 4957 } 4958 4959 /** 4960 * Request that a rectangle of this view be visible on the screen, 4961 * scrolling if necessary just enough. 4962 * 4963 * <p>A View should call this if it maintains some notion of which part 4964 * of its content is interesting. For example, a text editing view 4965 * should call this when its cursor moves. 4966 * 4967 * @param rectangle The rectangle. 4968 * @return Whether any parent scrolled. 4969 */ 4970 public boolean requestRectangleOnScreen(Rect rectangle) { 4971 return requestRectangleOnScreen(rectangle, false); 4972 } 4973 4974 /** 4975 * Request that a rectangle of this view be visible on the screen, 4976 * scrolling if necessary just enough. 4977 * 4978 * <p>A View should call this if it maintains some notion of which part 4979 * of its content is interesting. For example, a text editing view 4980 * should call this when its cursor moves. 4981 * 4982 * <p>When <code>immediate</code> is set to true, scrolling will not be 4983 * animated. 4984 * 4985 * @param rectangle The rectangle. 4986 * @param immediate True to forbid animated scrolling, false otherwise 4987 * @return Whether any parent scrolled. 4988 */ 4989 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4990 if (mParent == null) { 4991 return false; 4992 } 4993 4994 View child = this; 4995 4996 RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF(); 4997 position.set(rectangle); 4998 4999 ViewParent parent = mParent; 5000 boolean scrolled = false; 5001 while (parent != null) { 5002 rectangle.set((int) position.left, (int) position.top, 5003 (int) position.right, (int) position.bottom); 5004 5005 scrolled |= parent.requestChildRectangleOnScreen(child, 5006 rectangle, immediate); 5007 5008 if (!child.hasIdentityMatrix()) { 5009 child.getMatrix().mapRect(position); 5010 } 5011 5012 position.offset(child.mLeft, child.mTop); 5013 5014 if (!(parent instanceof View)) { 5015 break; 5016 } 5017 5018 View parentView = (View) parent; 5019 5020 position.offset(-parentView.getScrollX(), -parentView.getScrollY()); 5021 5022 child = parentView; 5023 parent = child.getParent(); 5024 } 5025 5026 return scrolled; 5027 } 5028 5029 /** 5030 * Called when this view wants to give up focus. If focus is cleared 5031 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 5032 * <p> 5033 * <strong>Note:</strong> When a View clears focus the framework is trying 5034 * to give focus to the first focusable View from the top. Hence, if this 5035 * View is the first from the top that can take focus, then all callbacks 5036 * related to clearing focus will be invoked after which the framework will 5037 * give focus to this view. 5038 * </p> 5039 */ 5040 public void clearFocus() { 5041 if (DBG) { 5042 System.out.println(this + " clearFocus()"); 5043 } 5044 5045 clearFocusInternal(null, true, true); 5046 } 5047 5048 /** 5049 * Clears focus from the view, optionally propagating the change up through 5050 * the parent hierarchy and requesting that the root view place new focus. 5051 * 5052 * @param propagate whether to propagate the change up through the parent 5053 * hierarchy 5054 * @param refocus when propagate is true, specifies whether to request the 5055 * root view place new focus 5056 */ 5057 void clearFocusInternal(View focused, boolean propagate, boolean refocus) { 5058 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 5059 mPrivateFlags &= ~PFLAG_FOCUSED; 5060 5061 if (propagate && mParent != null) { 5062 mParent.clearChildFocus(this); 5063 } 5064 5065 onFocusChanged(false, 0, null); 5066 refreshDrawableState(); 5067 5068 if (propagate && (!refocus || !rootViewRequestFocus())) { 5069 notifyGlobalFocusCleared(this); 5070 } 5071 } 5072 } 5073 5074 void notifyGlobalFocusCleared(View oldFocus) { 5075 if (oldFocus != null && mAttachInfo != null) { 5076 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null); 5077 } 5078 } 5079 5080 boolean rootViewRequestFocus() { 5081 final View root = getRootView(); 5082 return root != null && root.requestFocus(); 5083 } 5084 5085 /** 5086 * Called internally by the view system when a new view is getting focus. 5087 * This is what clears the old focus. 5088 * <p> 5089 * <b>NOTE:</b> The parent view's focused child must be updated manually 5090 * after calling this method. Otherwise, the view hierarchy may be left in 5091 * an inconstent state. 5092 */ 5093 void unFocus(View focused) { 5094 if (DBG) { 5095 System.out.println(this + " unFocus()"); 5096 } 5097 5098 clearFocusInternal(focused, false, false); 5099 } 5100 5101 /** 5102 * Returns true if this view has focus iteself, or is the ancestor of the 5103 * view that has focus. 5104 * 5105 * @return True if this view has or contains focus, false otherwise. 5106 */ 5107 @ViewDebug.ExportedProperty(category = "focus") 5108 public boolean hasFocus() { 5109 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 5110 } 5111 5112 /** 5113 * Returns true if this view is focusable or if it contains a reachable View 5114 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 5115 * is a View whose parents do not block descendants focus. 5116 * 5117 * Only {@link #VISIBLE} views are considered focusable. 5118 * 5119 * @return True if the view is focusable or if the view contains a focusable 5120 * View, false otherwise. 5121 * 5122 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 5123 * @see ViewGroup#getTouchscreenBlocksFocus() 5124 */ 5125 public boolean hasFocusable() { 5126 if (!isFocusableInTouchMode()) { 5127 for (ViewParent p = mParent; p instanceof ViewGroup; p = p.getParent()) { 5128 final ViewGroup g = (ViewGroup) p; 5129 if (g.shouldBlockFocusForTouchscreen()) { 5130 return false; 5131 } 5132 } 5133 } 5134 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 5135 } 5136 5137 /** 5138 * Called by the view system when the focus state of this view changes. 5139 * When the focus change event is caused by directional navigation, direction 5140 * and previouslyFocusedRect provide insight into where the focus is coming from. 5141 * When overriding, be sure to call up through to the super class so that 5142 * the standard focus handling will occur. 5143 * 5144 * @param gainFocus True if the View has focus; false otherwise. 5145 * @param direction The direction focus has moved when requestFocus() 5146 * is called to give this view focus. Values are 5147 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 5148 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 5149 * It may not always apply, in which case use the default. 5150 * @param previouslyFocusedRect The rectangle, in this view's coordinate 5151 * system, of the previously focused view. If applicable, this will be 5152 * passed in as finer grained information about where the focus is coming 5153 * from (in addition to direction). Will be <code>null</code> otherwise. 5154 */ 5155 protected void onFocusChanged(boolean gainFocus, @FocusDirection int direction, 5156 @Nullable Rect previouslyFocusedRect) { 5157 if (gainFocus) { 5158 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 5159 } else { 5160 notifyViewAccessibilityStateChangedIfNeeded( 5161 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 5162 } 5163 5164 InputMethodManager imm = InputMethodManager.peekInstance(); 5165 if (!gainFocus) { 5166 if (isPressed()) { 5167 setPressed(false); 5168 } 5169 if (imm != null && mAttachInfo != null 5170 && mAttachInfo.mHasWindowFocus) { 5171 imm.focusOut(this); 5172 } 5173 onFocusLost(); 5174 } else if (imm != null && mAttachInfo != null 5175 && mAttachInfo.mHasWindowFocus) { 5176 imm.focusIn(this); 5177 } 5178 5179 invalidate(true); 5180 ListenerInfo li = mListenerInfo; 5181 if (li != null && li.mOnFocusChangeListener != null) { 5182 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 5183 } 5184 5185 if (mAttachInfo != null) { 5186 mAttachInfo.mKeyDispatchState.reset(this); 5187 } 5188 } 5189 5190 /** 5191 * Sends an accessibility event of the given type. If accessibility is 5192 * not enabled this method has no effect. The default implementation calls 5193 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 5194 * to populate information about the event source (this View), then calls 5195 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 5196 * populate the text content of the event source including its descendants, 5197 * and last calls 5198 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 5199 * on its parent to resuest sending of the event to interested parties. 5200 * <p> 5201 * If an {@link AccessibilityDelegate} has been specified via calling 5202 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5203 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 5204 * responsible for handling this call. 5205 * </p> 5206 * 5207 * @param eventType The type of the event to send, as defined by several types from 5208 * {@link android.view.accessibility.AccessibilityEvent}, such as 5209 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 5210 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 5211 * 5212 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 5213 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 5214 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 5215 * @see AccessibilityDelegate 5216 */ 5217 public void sendAccessibilityEvent(int eventType) { 5218 if (mAccessibilityDelegate != null) { 5219 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 5220 } else { 5221 sendAccessibilityEventInternal(eventType); 5222 } 5223 } 5224 5225 /** 5226 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 5227 * {@link AccessibilityEvent} to make an announcement which is related to some 5228 * sort of a context change for which none of the events representing UI transitions 5229 * is a good fit. For example, announcing a new page in a book. If accessibility 5230 * is not enabled this method does nothing. 5231 * 5232 * @param text The announcement text. 5233 */ 5234 public void announceForAccessibility(CharSequence text) { 5235 if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) { 5236 AccessibilityEvent event = AccessibilityEvent.obtain( 5237 AccessibilityEvent.TYPE_ANNOUNCEMENT); 5238 onInitializeAccessibilityEvent(event); 5239 event.getText().add(text); 5240 event.setContentDescription(null); 5241 mParent.requestSendAccessibilityEvent(this, event); 5242 } 5243 } 5244 5245 /** 5246 * @see #sendAccessibilityEvent(int) 5247 * 5248 * Note: Called from the default {@link AccessibilityDelegate}. 5249 */ 5250 void sendAccessibilityEventInternal(int eventType) { 5251 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 5252 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 5253 } 5254 } 5255 5256 /** 5257 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 5258 * takes as an argument an empty {@link AccessibilityEvent} and does not 5259 * perform a check whether accessibility is enabled. 5260 * <p> 5261 * If an {@link AccessibilityDelegate} has been specified via calling 5262 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5263 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 5264 * is responsible for handling this call. 5265 * </p> 5266 * 5267 * @param event The event to send. 5268 * 5269 * @see #sendAccessibilityEvent(int) 5270 */ 5271 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 5272 if (mAccessibilityDelegate != null) { 5273 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 5274 } else { 5275 sendAccessibilityEventUncheckedInternal(event); 5276 } 5277 } 5278 5279 /** 5280 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 5281 * 5282 * Note: Called from the default {@link AccessibilityDelegate}. 5283 */ 5284 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 5285 if (!isShown()) { 5286 return; 5287 } 5288 onInitializeAccessibilityEvent(event); 5289 // Only a subset of accessibility events populates text content. 5290 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 5291 dispatchPopulateAccessibilityEvent(event); 5292 } 5293 // In the beginning we called #isShown(), so we know that getParent() is not null. 5294 getParent().requestSendAccessibilityEvent(this, event); 5295 } 5296 5297 /** 5298 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 5299 * to its children for adding their text content to the event. Note that the 5300 * event text is populated in a separate dispatch path since we add to the 5301 * event not only the text of the source but also the text of all its descendants. 5302 * A typical implementation will call 5303 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 5304 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 5305 * on each child. Override this method if custom population of the event text 5306 * content is required. 5307 * <p> 5308 * If an {@link AccessibilityDelegate} has been specified via calling 5309 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5310 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 5311 * is responsible for handling this call. 5312 * </p> 5313 * <p> 5314 * <em>Note:</em> Accessibility events of certain types are not dispatched for 5315 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 5316 * </p> 5317 * 5318 * @param event The event. 5319 * 5320 * @return True if the event population was completed. 5321 */ 5322 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 5323 if (mAccessibilityDelegate != null) { 5324 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 5325 } else { 5326 return dispatchPopulateAccessibilityEventInternal(event); 5327 } 5328 } 5329 5330 /** 5331 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 5332 * 5333 * Note: Called from the default {@link AccessibilityDelegate}. 5334 */ 5335 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 5336 onPopulateAccessibilityEvent(event); 5337 return false; 5338 } 5339 5340 /** 5341 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 5342 * giving a chance to this View to populate the accessibility event with its 5343 * text content. While this method is free to modify event 5344 * attributes other than text content, doing so should normally be performed in 5345 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 5346 * <p> 5347 * Example: Adding formatted date string to an accessibility event in addition 5348 * to the text added by the super implementation: 5349 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 5350 * super.onPopulateAccessibilityEvent(event); 5351 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 5352 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 5353 * mCurrentDate.getTimeInMillis(), flags); 5354 * event.getText().add(selectedDateUtterance); 5355 * }</pre> 5356 * <p> 5357 * If an {@link AccessibilityDelegate} has been specified via calling 5358 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5359 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 5360 * is responsible for handling this call. 5361 * </p> 5362 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 5363 * information to the event, in case the default implementation has basic information to add. 5364 * </p> 5365 * 5366 * @param event The accessibility event which to populate. 5367 * 5368 * @see #sendAccessibilityEvent(int) 5369 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 5370 */ 5371 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 5372 if (mAccessibilityDelegate != null) { 5373 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 5374 } else { 5375 onPopulateAccessibilityEventInternal(event); 5376 } 5377 } 5378 5379 /** 5380 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 5381 * 5382 * Note: Called from the default {@link AccessibilityDelegate}. 5383 */ 5384 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 5385 } 5386 5387 /** 5388 * Initializes an {@link AccessibilityEvent} with information about 5389 * this View which is the event source. In other words, the source of 5390 * an accessibility event is the view whose state change triggered firing 5391 * the event. 5392 * <p> 5393 * Example: Setting the password property of an event in addition 5394 * to properties set by the super implementation: 5395 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 5396 * super.onInitializeAccessibilityEvent(event); 5397 * event.setPassword(true); 5398 * }</pre> 5399 * <p> 5400 * If an {@link AccessibilityDelegate} has been specified via calling 5401 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5402 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 5403 * is responsible for handling this call. 5404 * </p> 5405 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 5406 * information to the event, in case the default implementation has basic information to add. 5407 * </p> 5408 * @param event The event to initialize. 5409 * 5410 * @see #sendAccessibilityEvent(int) 5411 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 5412 */ 5413 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 5414 if (mAccessibilityDelegate != null) { 5415 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 5416 } else { 5417 onInitializeAccessibilityEventInternal(event); 5418 } 5419 } 5420 5421 /** 5422 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 5423 * 5424 * Note: Called from the default {@link AccessibilityDelegate}. 5425 */ 5426 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 5427 event.setSource(this); 5428 event.setClassName(View.class.getName()); 5429 event.setPackageName(getContext().getPackageName()); 5430 event.setEnabled(isEnabled()); 5431 event.setContentDescription(mContentDescription); 5432 5433 switch (event.getEventType()) { 5434 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 5435 ArrayList<View> focusablesTempList = (mAttachInfo != null) 5436 ? mAttachInfo.mTempArrayList : new ArrayList<View>(); 5437 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 5438 event.setItemCount(focusablesTempList.size()); 5439 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 5440 if (mAttachInfo != null) { 5441 focusablesTempList.clear(); 5442 } 5443 } break; 5444 case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED: { 5445 CharSequence text = getIterableTextForAccessibility(); 5446 if (text != null && text.length() > 0) { 5447 event.setFromIndex(getAccessibilitySelectionStart()); 5448 event.setToIndex(getAccessibilitySelectionEnd()); 5449 event.setItemCount(text.length()); 5450 } 5451 } break; 5452 } 5453 } 5454 5455 /** 5456 * Returns an {@link AccessibilityNodeInfo} representing this view from the 5457 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 5458 * This method is responsible for obtaining an accessibility node info from a 5459 * pool of reusable instances and calling 5460 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 5461 * initialize the former. 5462 * <p> 5463 * Note: The client is responsible for recycling the obtained instance by calling 5464 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 5465 * </p> 5466 * 5467 * @return A populated {@link AccessibilityNodeInfo}. 5468 * 5469 * @see AccessibilityNodeInfo 5470 */ 5471 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 5472 if (mAccessibilityDelegate != null) { 5473 return mAccessibilityDelegate.createAccessibilityNodeInfo(this); 5474 } else { 5475 return createAccessibilityNodeInfoInternal(); 5476 } 5477 } 5478 5479 /** 5480 * @see #createAccessibilityNodeInfo() 5481 */ 5482 AccessibilityNodeInfo createAccessibilityNodeInfoInternal() { 5483 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 5484 if (provider != null) { 5485 return provider.createAccessibilityNodeInfo(View.NO_ID); 5486 } else { 5487 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 5488 onInitializeAccessibilityNodeInfo(info); 5489 return info; 5490 } 5491 } 5492 5493 /** 5494 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 5495 * The base implementation sets: 5496 * <ul> 5497 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 5498 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 5499 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 5500 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 5501 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 5502 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 5503 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 5504 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 5505 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 5506 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 5507 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 5508 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 5509 * </ul> 5510 * <p> 5511 * Subclasses should override this method, call the super implementation, 5512 * and set additional attributes. 5513 * </p> 5514 * <p> 5515 * If an {@link AccessibilityDelegate} has been specified via calling 5516 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5517 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 5518 * is responsible for handling this call. 5519 * </p> 5520 * 5521 * @param info The instance to initialize. 5522 */ 5523 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 5524 if (mAccessibilityDelegate != null) { 5525 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 5526 } else { 5527 onInitializeAccessibilityNodeInfoInternal(info); 5528 } 5529 } 5530 5531 /** 5532 * Gets the location of this view in screen coordintates. 5533 * 5534 * @param outRect The output location 5535 * @hide 5536 */ 5537 public void getBoundsOnScreen(Rect outRect) { 5538 if (mAttachInfo == null) { 5539 return; 5540 } 5541 5542 RectF position = mAttachInfo.mTmpTransformRect; 5543 position.set(0, 0, mRight - mLeft, mBottom - mTop); 5544 5545 if (!hasIdentityMatrix()) { 5546 getMatrix().mapRect(position); 5547 } 5548 5549 position.offset(mLeft, mTop); 5550 5551 ViewParent parent = mParent; 5552 while (parent instanceof View) { 5553 View parentView = (View) parent; 5554 5555 position.offset(-parentView.mScrollX, -parentView.mScrollY); 5556 5557 if (!parentView.hasIdentityMatrix()) { 5558 parentView.getMatrix().mapRect(position); 5559 } 5560 5561 position.offset(parentView.mLeft, parentView.mTop); 5562 5563 parent = parentView.mParent; 5564 } 5565 5566 if (parent instanceof ViewRootImpl) { 5567 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 5568 position.offset(0, -viewRootImpl.mCurScrollY); 5569 } 5570 5571 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 5572 5573 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 5574 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 5575 } 5576 5577 /** 5578 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 5579 * 5580 * Note: Called from the default {@link AccessibilityDelegate}. 5581 */ 5582 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 5583 Rect bounds = mAttachInfo.mTmpInvalRect; 5584 5585 getDrawingRect(bounds); 5586 info.setBoundsInParent(bounds); 5587 5588 getBoundsOnScreen(bounds); 5589 info.setBoundsInScreen(bounds); 5590 5591 ViewParent parent = getParentForAccessibility(); 5592 if (parent instanceof View) { 5593 info.setParent((View) parent); 5594 } 5595 5596 if (mID != View.NO_ID) { 5597 View rootView = getRootView(); 5598 if (rootView == null) { 5599 rootView = this; 5600 } 5601 View label = rootView.findLabelForView(this, mID); 5602 if (label != null) { 5603 info.setLabeledBy(label); 5604 } 5605 5606 if ((mAttachInfo.mAccessibilityFetchFlags 5607 & AccessibilityNodeInfo.FLAG_REPORT_VIEW_IDS) != 0 5608 && Resources.resourceHasPackage(mID)) { 5609 try { 5610 String viewId = getResources().getResourceName(mID); 5611 info.setViewIdResourceName(viewId); 5612 } catch (Resources.NotFoundException nfe) { 5613 /* ignore */ 5614 } 5615 } 5616 } 5617 5618 if (mLabelForId != View.NO_ID) { 5619 View rootView = getRootView(); 5620 if (rootView == null) { 5621 rootView = this; 5622 } 5623 View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId); 5624 if (labeled != null) { 5625 info.setLabelFor(labeled); 5626 } 5627 } 5628 5629 info.setVisibleToUser(isVisibleToUser()); 5630 5631 info.setPackageName(mContext.getPackageName()); 5632 info.setClassName(View.class.getName()); 5633 info.setContentDescription(getContentDescription()); 5634 5635 info.setEnabled(isEnabled()); 5636 info.setClickable(isClickable()); 5637 info.setFocusable(isFocusable()); 5638 info.setFocused(isFocused()); 5639 info.setAccessibilityFocused(isAccessibilityFocused()); 5640 info.setSelected(isSelected()); 5641 info.setLongClickable(isLongClickable()); 5642 info.setLiveRegion(getAccessibilityLiveRegion()); 5643 5644 // TODO: These make sense only if we are in an AdapterView but all 5645 // views can be selected. Maybe from accessibility perspective 5646 // we should report as selectable view in an AdapterView. 5647 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 5648 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 5649 5650 if (isFocusable()) { 5651 if (isFocused()) { 5652 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 5653 } else { 5654 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 5655 } 5656 } 5657 5658 if (!isAccessibilityFocused()) { 5659 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 5660 } else { 5661 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 5662 } 5663 5664 if (isClickable() && isEnabled()) { 5665 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 5666 } 5667 5668 if (isLongClickable() && isEnabled()) { 5669 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 5670 } 5671 5672 CharSequence text = getIterableTextForAccessibility(); 5673 if (text != null && text.length() > 0) { 5674 info.setTextSelection(getAccessibilitySelectionStart(), getAccessibilitySelectionEnd()); 5675 5676 info.addAction(AccessibilityNodeInfo.ACTION_SET_SELECTION); 5677 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 5678 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 5679 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 5680 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 5681 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 5682 } 5683 } 5684 5685 private View findLabelForView(View view, int labeledId) { 5686 if (mMatchLabelForPredicate == null) { 5687 mMatchLabelForPredicate = new MatchLabelForPredicate(); 5688 } 5689 mMatchLabelForPredicate.mLabeledId = labeledId; 5690 return findViewByPredicateInsideOut(view, mMatchLabelForPredicate); 5691 } 5692 5693 /** 5694 * Computes whether this view is visible to the user. Such a view is 5695 * attached, visible, all its predecessors are visible, it is not clipped 5696 * entirely by its predecessors, and has an alpha greater than zero. 5697 * 5698 * @return Whether the view is visible on the screen. 5699 * 5700 * @hide 5701 */ 5702 protected boolean isVisibleToUser() { 5703 return isVisibleToUser(null); 5704 } 5705 5706 /** 5707 * Computes whether the given portion of this view is visible to the user. 5708 * Such a view is attached, visible, all its predecessors are visible, 5709 * has an alpha greater than zero, and the specified portion is not 5710 * clipped entirely by its predecessors. 5711 * 5712 * @param boundInView the portion of the view to test; coordinates should be relative; may be 5713 * <code>null</code>, and the entire view will be tested in this case. 5714 * When <code>true</code> is returned by the function, the actual visible 5715 * region will be stored in this parameter; that is, if boundInView is fully 5716 * contained within the view, no modification will be made, otherwise regions 5717 * outside of the visible area of the view will be clipped. 5718 * 5719 * @return Whether the specified portion of the view is visible on the screen. 5720 * 5721 * @hide 5722 */ 5723 protected boolean isVisibleToUser(Rect boundInView) { 5724 if (mAttachInfo != null) { 5725 // Attached to invisible window means this view is not visible. 5726 if (mAttachInfo.mWindowVisibility != View.VISIBLE) { 5727 return false; 5728 } 5729 // An invisible predecessor or one with alpha zero means 5730 // that this view is not visible to the user. 5731 Object current = this; 5732 while (current instanceof View) { 5733 View view = (View) current; 5734 // We have attach info so this view is attached and there is no 5735 // need to check whether we reach to ViewRootImpl on the way up. 5736 if (view.getAlpha() <= 0 || view.getTransitionAlpha() <= 0 || 5737 view.getVisibility() != VISIBLE) { 5738 return false; 5739 } 5740 current = view.mParent; 5741 } 5742 // Check if the view is entirely covered by its predecessors. 5743 Rect visibleRect = mAttachInfo.mTmpInvalRect; 5744 Point offset = mAttachInfo.mPoint; 5745 if (!getGlobalVisibleRect(visibleRect, offset)) { 5746 return false; 5747 } 5748 // Check if the visible portion intersects the rectangle of interest. 5749 if (boundInView != null) { 5750 visibleRect.offset(-offset.x, -offset.y); 5751 return boundInView.intersect(visibleRect); 5752 } 5753 return true; 5754 } 5755 return false; 5756 } 5757 5758 /** 5759 * Computes a point on which a sequence of a down/up event can be sent to 5760 * trigger clicking this view. This method is for the exclusive use by the 5761 * accessibility layer to determine where to send a click event in explore 5762 * by touch mode. 5763 * 5764 * @param interactiveRegion The interactive portion of this window. 5765 * @param outPoint The point to populate. 5766 * @return True of such a point exists. 5767 */ 5768 boolean computeClickPointInScreenForAccessibility(Region interactiveRegion, 5769 Point outPoint) { 5770 // Since the interactive portion of the view is a region but as a view 5771 // may have a transformation matrix which cannot be applied to a 5772 // region we compute the view bounds rectangle and all interactive 5773 // predecessor's and sibling's (siblings of predecessors included) 5774 // rectangles that intersect the view bounds. At the 5775 // end if the view was partially covered by another interactive 5776 // view we compute the view's interactive region and pick a point 5777 // on its boundary path as regions do not offer APIs to get inner 5778 // points. Note that the the code is optimized to fail early and 5779 // avoid unnecessary allocations plus computations. 5780 5781 // The current approach has edge cases that may produce false 5782 // positives or false negatives. For example, a portion of the 5783 // view may be covered by an interactive descendant of a 5784 // predecessor, which we do not compute. Also a view may be handling 5785 // raw touch events instead registering click listeners, which 5786 // we cannot compute. Despite these limitations this approach will 5787 // work most of the time and it is a huge improvement over just 5788 // blindly sending the down and up events in the center of the 5789 // view. 5790 5791 // Cannot click on an unattached view. 5792 if (mAttachInfo == null) { 5793 return false; 5794 } 5795 5796 // Attached to an invisible window means this view is not visible. 5797 if (mAttachInfo.mWindowVisibility != View.VISIBLE) { 5798 return false; 5799 } 5800 5801 RectF bounds = mAttachInfo.mTmpTransformRect; 5802 bounds.set(0, 0, getWidth(), getHeight()); 5803 List<RectF> intersections = mAttachInfo.mTmpRectList; 5804 intersections.clear(); 5805 5806 if (mParent instanceof ViewGroup) { 5807 ViewGroup parentGroup = (ViewGroup) mParent; 5808 if (!parentGroup.translateBoundsAndIntersectionsInWindowCoordinates( 5809 this, bounds, intersections)) { 5810 intersections.clear(); 5811 return false; 5812 } 5813 } 5814 5815 // Take into account the window location. 5816 final int dx = mAttachInfo.mWindowLeft; 5817 final int dy = mAttachInfo.mWindowTop; 5818 bounds.offset(dx, dy); 5819 offsetRects(intersections, dx, dy); 5820 5821 if (intersections.isEmpty() && interactiveRegion == null) { 5822 outPoint.set((int) bounds.centerX(), (int) bounds.centerY()); 5823 } else { 5824 // This view is partially covered by other views, then compute 5825 // the not covered region and pick a point on its boundary. 5826 Region region = new Region(); 5827 region.set((int) bounds.left, (int) bounds.top, 5828 (int) bounds.right, (int) bounds.bottom); 5829 5830 final int intersectionCount = intersections.size(); 5831 for (int i = intersectionCount - 1; i >= 0; i--) { 5832 RectF intersection = intersections.remove(i); 5833 region.op((int) intersection.left, (int) intersection.top, 5834 (int) intersection.right, (int) intersection.bottom, 5835 Region.Op.DIFFERENCE); 5836 } 5837 5838 // If the view is completely covered, done. 5839 if (region.isEmpty()) { 5840 return false; 5841 } 5842 5843 // Take into account the interactive portion of the window 5844 // as the rest is covered by other windows. If no such a region 5845 // then the whole window is interactive. 5846 if (interactiveRegion != null) { 5847 region.op(interactiveRegion, Region.Op.INTERSECT); 5848 } 5849 5850 // If the view is completely covered, done. 5851 if (region.isEmpty()) { 5852 return false; 5853 } 5854 5855 // Try a shortcut here. 5856 if (region.isRect()) { 5857 Rect regionBounds = mAttachInfo.mTmpInvalRect; 5858 region.getBounds(regionBounds); 5859 outPoint.set(regionBounds.centerX(), regionBounds.centerY()); 5860 return true; 5861 } 5862 5863 // Get the a point on the region boundary path. 5864 Path path = region.getBoundaryPath(); 5865 PathMeasure pathMeasure = new PathMeasure(path, false); 5866 final float[] coordinates = mAttachInfo.mTmpTransformLocation; 5867 5868 // Without loss of generality pick a point. 5869 final float point = pathMeasure.getLength() * 0.01f; 5870 if (!pathMeasure.getPosTan(point, coordinates, null)) { 5871 return false; 5872 } 5873 5874 outPoint.set(Math.round(coordinates[0]), Math.round(coordinates[1])); 5875 } 5876 5877 return true; 5878 } 5879 5880 /** 5881 * Adds the clickable rectangles withing the bounds of this view. They 5882 * may overlap. This method is intended for use only by the accessibility 5883 * layer. 5884 * 5885 * @param outRects List to which to add clickable areas. 5886 */ 5887 void addClickableRectsForAccessibility(List<RectF> outRects) { 5888 if (isClickable() || isLongClickable()) { 5889 RectF bounds = new RectF(); 5890 bounds.set(0, 0, getWidth(), getHeight()); 5891 outRects.add(bounds); 5892 } 5893 } 5894 5895 static void offsetRects(List<RectF> rects, float offsetX, float offsetY) { 5896 final int rectCount = rects.size(); 5897 for (int i = 0; i < rectCount; i++) { 5898 RectF intersection = rects.get(i); 5899 intersection.offset(offsetX, offsetY); 5900 } 5901 } 5902 5903 /** 5904 * Returns the delegate for implementing accessibility support via 5905 * composition. For more details see {@link AccessibilityDelegate}. 5906 * 5907 * @return The delegate, or null if none set. 5908 * 5909 * @hide 5910 */ 5911 public AccessibilityDelegate getAccessibilityDelegate() { 5912 return mAccessibilityDelegate; 5913 } 5914 5915 /** 5916 * Sets a delegate for implementing accessibility support via composition as 5917 * opposed to inheritance. The delegate's primary use is for implementing 5918 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 5919 * 5920 * @param delegate The delegate instance. 5921 * 5922 * @see AccessibilityDelegate 5923 */ 5924 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 5925 mAccessibilityDelegate = delegate; 5926 } 5927 5928 /** 5929 * Gets the provider for managing a virtual view hierarchy rooted at this View 5930 * and reported to {@link android.accessibilityservice.AccessibilityService}s 5931 * that explore the window content. 5932 * <p> 5933 * If this method returns an instance, this instance is responsible for managing 5934 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 5935 * View including the one representing the View itself. Similarly the returned 5936 * instance is responsible for performing accessibility actions on any virtual 5937 * view or the root view itself. 5938 * </p> 5939 * <p> 5940 * If an {@link AccessibilityDelegate} has been specified via calling 5941 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5942 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 5943 * is responsible for handling this call. 5944 * </p> 5945 * 5946 * @return The provider. 5947 * 5948 * @see AccessibilityNodeProvider 5949 */ 5950 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 5951 if (mAccessibilityDelegate != null) { 5952 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 5953 } else { 5954 return null; 5955 } 5956 } 5957 5958 /** 5959 * Gets the unique identifier of this view on the screen for accessibility purposes. 5960 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 5961 * 5962 * @return The view accessibility id. 5963 * 5964 * @hide 5965 */ 5966 public int getAccessibilityViewId() { 5967 if (mAccessibilityViewId == NO_ID) { 5968 mAccessibilityViewId = sNextAccessibilityViewId++; 5969 } 5970 return mAccessibilityViewId; 5971 } 5972 5973 /** 5974 * Gets the unique identifier of the window in which this View reseides. 5975 * 5976 * @return The window accessibility id. 5977 * 5978 * @hide 5979 */ 5980 public int getAccessibilityWindowId() { 5981 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId 5982 : AccessibilityNodeInfo.UNDEFINED_ITEM_ID; 5983 } 5984 5985 /** 5986 * Gets the {@link View} description. It briefly describes the view and is 5987 * primarily used for accessibility support. Set this property to enable 5988 * better accessibility support for your application. This is especially 5989 * true for views that do not have textual representation (For example, 5990 * ImageButton). 5991 * 5992 * @return The content description. 5993 * 5994 * @attr ref android.R.styleable#View_contentDescription 5995 */ 5996 @ViewDebug.ExportedProperty(category = "accessibility") 5997 public CharSequence getContentDescription() { 5998 return mContentDescription; 5999 } 6000 6001 /** 6002 * Sets the {@link View} description. It briefly describes the view and is 6003 * primarily used for accessibility support. Set this property to enable 6004 * better accessibility support for your application. This is especially 6005 * true for views that do not have textual representation (For example, 6006 * ImageButton). 6007 * 6008 * @param contentDescription The content description. 6009 * 6010 * @attr ref android.R.styleable#View_contentDescription 6011 */ 6012 @RemotableViewMethod 6013 public void setContentDescription(CharSequence contentDescription) { 6014 if (mContentDescription == null) { 6015 if (contentDescription == null) { 6016 return; 6017 } 6018 } else if (mContentDescription.equals(contentDescription)) { 6019 return; 6020 } 6021 mContentDescription = contentDescription; 6022 final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; 6023 if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 6024 setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 6025 notifySubtreeAccessibilityStateChangedIfNeeded(); 6026 } else { 6027 notifyViewAccessibilityStateChangedIfNeeded( 6028 AccessibilityEvent.CONTENT_CHANGE_TYPE_CONTENT_DESCRIPTION); 6029 } 6030 } 6031 6032 /** 6033 * Gets the id of a view for which this view serves as a label for 6034 * accessibility purposes. 6035 * 6036 * @return The labeled view id. 6037 */ 6038 @ViewDebug.ExportedProperty(category = "accessibility") 6039 public int getLabelFor() { 6040 return mLabelForId; 6041 } 6042 6043 /** 6044 * Sets the id of a view for which this view serves as a label for 6045 * accessibility purposes. 6046 * 6047 * @param id The labeled view id. 6048 */ 6049 @RemotableViewMethod 6050 public void setLabelFor(int id) { 6051 mLabelForId = id; 6052 if (mLabelForId != View.NO_ID 6053 && mID == View.NO_ID) { 6054 mID = generateViewId(); 6055 } 6056 } 6057 6058 /** 6059 * Invoked whenever this view loses focus, either by losing window focus or by losing 6060 * focus within its window. This method can be used to clear any state tied to the 6061 * focus. For instance, if a button is held pressed with the trackball and the window 6062 * loses focus, this method can be used to cancel the press. 6063 * 6064 * Subclasses of View overriding this method should always call super.onFocusLost(). 6065 * 6066 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 6067 * @see #onWindowFocusChanged(boolean) 6068 * 6069 * @hide pending API council approval 6070 */ 6071 protected void onFocusLost() { 6072 resetPressedState(); 6073 } 6074 6075 private void resetPressedState() { 6076 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 6077 return; 6078 } 6079 6080 if (isPressed()) { 6081 setPressed(false); 6082 6083 if (!mHasPerformedLongPress) { 6084 removeLongPressCallback(); 6085 } 6086 } 6087 } 6088 6089 /** 6090 * Returns true if this view has focus 6091 * 6092 * @return True if this view has focus, false otherwise. 6093 */ 6094 @ViewDebug.ExportedProperty(category = "focus") 6095 public boolean isFocused() { 6096 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 6097 } 6098 6099 /** 6100 * Find the view in the hierarchy rooted at this view that currently has 6101 * focus. 6102 * 6103 * @return The view that currently has focus, or null if no focused view can 6104 * be found. 6105 */ 6106 public View findFocus() { 6107 return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null; 6108 } 6109 6110 /** 6111 * Indicates whether this view is one of the set of scrollable containers in 6112 * its window. 6113 * 6114 * @return whether this view is one of the set of scrollable containers in 6115 * its window 6116 * 6117 * @attr ref android.R.styleable#View_isScrollContainer 6118 */ 6119 public boolean isScrollContainer() { 6120 return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0; 6121 } 6122 6123 /** 6124 * Change whether this view is one of the set of scrollable containers in 6125 * its window. This will be used to determine whether the window can 6126 * resize or must pan when a soft input area is open -- scrollable 6127 * containers allow the window to use resize mode since the container 6128 * will appropriately shrink. 6129 * 6130 * @attr ref android.R.styleable#View_isScrollContainer 6131 */ 6132 public void setScrollContainer(boolean isScrollContainer) { 6133 if (isScrollContainer) { 6134 if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) { 6135 mAttachInfo.mScrollContainers.add(this); 6136 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 6137 } 6138 mPrivateFlags |= PFLAG_SCROLL_CONTAINER; 6139 } else { 6140 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 6141 mAttachInfo.mScrollContainers.remove(this); 6142 } 6143 mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED); 6144 } 6145 } 6146 6147 /** 6148 * Returns the quality of the drawing cache. 6149 * 6150 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 6151 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 6152 * 6153 * @see #setDrawingCacheQuality(int) 6154 * @see #setDrawingCacheEnabled(boolean) 6155 * @see #isDrawingCacheEnabled() 6156 * 6157 * @attr ref android.R.styleable#View_drawingCacheQuality 6158 */ 6159 @DrawingCacheQuality 6160 public int getDrawingCacheQuality() { 6161 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 6162 } 6163 6164 /** 6165 * Set the drawing cache quality of this view. This value is used only when the 6166 * drawing cache is enabled 6167 * 6168 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 6169 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 6170 * 6171 * @see #getDrawingCacheQuality() 6172 * @see #setDrawingCacheEnabled(boolean) 6173 * @see #isDrawingCacheEnabled() 6174 * 6175 * @attr ref android.R.styleable#View_drawingCacheQuality 6176 */ 6177 public void setDrawingCacheQuality(@DrawingCacheQuality int quality) { 6178 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 6179 } 6180 6181 /** 6182 * Returns whether the screen should remain on, corresponding to the current 6183 * value of {@link #KEEP_SCREEN_ON}. 6184 * 6185 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 6186 * 6187 * @see #setKeepScreenOn(boolean) 6188 * 6189 * @attr ref android.R.styleable#View_keepScreenOn 6190 */ 6191 public boolean getKeepScreenOn() { 6192 return (mViewFlags & KEEP_SCREEN_ON) != 0; 6193 } 6194 6195 /** 6196 * Controls whether the screen should remain on, modifying the 6197 * value of {@link #KEEP_SCREEN_ON}. 6198 * 6199 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 6200 * 6201 * @see #getKeepScreenOn() 6202 * 6203 * @attr ref android.R.styleable#View_keepScreenOn 6204 */ 6205 public void setKeepScreenOn(boolean keepScreenOn) { 6206 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 6207 } 6208 6209 /** 6210 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 6211 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 6212 * 6213 * @attr ref android.R.styleable#View_nextFocusLeft 6214 */ 6215 public int getNextFocusLeftId() { 6216 return mNextFocusLeftId; 6217 } 6218 6219 /** 6220 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 6221 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 6222 * decide automatically. 6223 * 6224 * @attr ref android.R.styleable#View_nextFocusLeft 6225 */ 6226 public void setNextFocusLeftId(int nextFocusLeftId) { 6227 mNextFocusLeftId = nextFocusLeftId; 6228 } 6229 6230 /** 6231 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 6232 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 6233 * 6234 * @attr ref android.R.styleable#View_nextFocusRight 6235 */ 6236 public int getNextFocusRightId() { 6237 return mNextFocusRightId; 6238 } 6239 6240 /** 6241 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 6242 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 6243 * decide automatically. 6244 * 6245 * @attr ref android.R.styleable#View_nextFocusRight 6246 */ 6247 public void setNextFocusRightId(int nextFocusRightId) { 6248 mNextFocusRightId = nextFocusRightId; 6249 } 6250 6251 /** 6252 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 6253 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 6254 * 6255 * @attr ref android.R.styleable#View_nextFocusUp 6256 */ 6257 public int getNextFocusUpId() { 6258 return mNextFocusUpId; 6259 } 6260 6261 /** 6262 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 6263 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 6264 * decide automatically. 6265 * 6266 * @attr ref android.R.styleable#View_nextFocusUp 6267 */ 6268 public void setNextFocusUpId(int nextFocusUpId) { 6269 mNextFocusUpId = nextFocusUpId; 6270 } 6271 6272 /** 6273 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 6274 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 6275 * 6276 * @attr ref android.R.styleable#View_nextFocusDown 6277 */ 6278 public int getNextFocusDownId() { 6279 return mNextFocusDownId; 6280 } 6281 6282 /** 6283 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 6284 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 6285 * decide automatically. 6286 * 6287 * @attr ref android.R.styleable#View_nextFocusDown 6288 */ 6289 public void setNextFocusDownId(int nextFocusDownId) { 6290 mNextFocusDownId = nextFocusDownId; 6291 } 6292 6293 /** 6294 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 6295 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 6296 * 6297 * @attr ref android.R.styleable#View_nextFocusForward 6298 */ 6299 public int getNextFocusForwardId() { 6300 return mNextFocusForwardId; 6301 } 6302 6303 /** 6304 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 6305 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 6306 * decide automatically. 6307 * 6308 * @attr ref android.R.styleable#View_nextFocusForward 6309 */ 6310 public void setNextFocusForwardId(int nextFocusForwardId) { 6311 mNextFocusForwardId = nextFocusForwardId; 6312 } 6313 6314 /** 6315 * Returns the visibility of this view and all of its ancestors 6316 * 6317 * @return True if this view and all of its ancestors are {@link #VISIBLE} 6318 */ 6319 public boolean isShown() { 6320 View current = this; 6321 //noinspection ConstantConditions 6322 do { 6323 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6324 return false; 6325 } 6326 ViewParent parent = current.mParent; 6327 if (parent == null) { 6328 return false; // We are not attached to the view root 6329 } 6330 if (!(parent instanceof View)) { 6331 return true; 6332 } 6333 current = (View) parent; 6334 } while (current != null); 6335 6336 return false; 6337 } 6338 6339 /** 6340 * Called by the view hierarchy when the content insets for a window have 6341 * changed, to allow it to adjust its content to fit within those windows. 6342 * The content insets tell you the space that the status bar, input method, 6343 * and other system windows infringe on the application's window. 6344 * 6345 * <p>You do not normally need to deal with this function, since the default 6346 * window decoration given to applications takes care of applying it to the 6347 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 6348 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 6349 * and your content can be placed under those system elements. You can then 6350 * use this method within your view hierarchy if you have parts of your UI 6351 * which you would like to ensure are not being covered. 6352 * 6353 * <p>The default implementation of this method simply applies the content 6354 * insets to the view's padding, consuming that content (modifying the 6355 * insets to be 0), and returning true. This behavior is off by default, but can 6356 * be enabled through {@link #setFitsSystemWindows(boolean)}. 6357 * 6358 * <p>This function's traversal down the hierarchy is depth-first. The same content 6359 * insets object is propagated down the hierarchy, so any changes made to it will 6360 * be seen by all following views (including potentially ones above in 6361 * the hierarchy since this is a depth-first traversal). The first view 6362 * that returns true will abort the entire traversal. 6363 * 6364 * <p>The default implementation works well for a situation where it is 6365 * used with a container that covers the entire window, allowing it to 6366 * apply the appropriate insets to its content on all edges. If you need 6367 * a more complicated layout (such as two different views fitting system 6368 * windows, one on the top of the window, and one on the bottom), 6369 * you can override the method and handle the insets however you would like. 6370 * Note that the insets provided by the framework are always relative to the 6371 * far edges of the window, not accounting for the location of the called view 6372 * within that window. (In fact when this method is called you do not yet know 6373 * where the layout will place the view, as it is done before layout happens.) 6374 * 6375 * <p>Note: unlike many View methods, there is no dispatch phase to this 6376 * call. If you are overriding it in a ViewGroup and want to allow the 6377 * call to continue to your children, you must be sure to call the super 6378 * implementation. 6379 * 6380 * <p>Here is a sample layout that makes use of fitting system windows 6381 * to have controls for a video view placed inside of the window decorations 6382 * that it hides and shows. This can be used with code like the second 6383 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 6384 * 6385 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 6386 * 6387 * @param insets Current content insets of the window. Prior to 6388 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 6389 * the insets or else you and Android will be unhappy. 6390 * 6391 * @return {@code true} if this view applied the insets and it should not 6392 * continue propagating further down the hierarchy, {@code false} otherwise. 6393 * @see #getFitsSystemWindows() 6394 * @see #setFitsSystemWindows(boolean) 6395 * @see #setSystemUiVisibility(int) 6396 * 6397 * @deprecated As of API 20 use {@link #dispatchApplyWindowInsets(WindowInsets)} to apply 6398 * insets to views. Views should override {@link #onApplyWindowInsets(WindowInsets)} or use 6399 * {@link #setOnApplyWindowInsetsListener(android.view.View.OnApplyWindowInsetsListener)} 6400 * to implement handling their own insets. 6401 */ 6402 protected boolean fitSystemWindows(Rect insets) { 6403 if ((mPrivateFlags3 & PFLAG3_APPLYING_INSETS) == 0) { 6404 if (insets == null) { 6405 // Null insets by definition have already been consumed. 6406 // This call cannot apply insets since there are none to apply, 6407 // so return false. 6408 return false; 6409 } 6410 // If we're not in the process of dispatching the newer apply insets call, 6411 // that means we're not in the compatibility path. Dispatch into the newer 6412 // apply insets path and take things from there. 6413 try { 6414 mPrivateFlags3 |= PFLAG3_FITTING_SYSTEM_WINDOWS; 6415 return dispatchApplyWindowInsets(new WindowInsets(insets)).isConsumed(); 6416 } finally { 6417 mPrivateFlags3 &= ~PFLAG3_FITTING_SYSTEM_WINDOWS; 6418 } 6419 } else { 6420 // We're being called from the newer apply insets path. 6421 // Perform the standard fallback behavior. 6422 return fitSystemWindowsInt(insets); 6423 } 6424 } 6425 6426 private boolean fitSystemWindowsInt(Rect insets) { 6427 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 6428 mUserPaddingStart = UNDEFINED_PADDING; 6429 mUserPaddingEnd = UNDEFINED_PADDING; 6430 Rect localInsets = sThreadLocal.get(); 6431 if (localInsets == null) { 6432 localInsets = new Rect(); 6433 sThreadLocal.set(localInsets); 6434 } 6435 boolean res = computeFitSystemWindows(insets, localInsets); 6436 mUserPaddingLeftInitial = localInsets.left; 6437 mUserPaddingRightInitial = localInsets.right; 6438 internalSetPadding(localInsets.left, localInsets.top, 6439 localInsets.right, localInsets.bottom); 6440 return res; 6441 } 6442 return false; 6443 } 6444 6445 /** 6446 * Called when the view should apply {@link WindowInsets} according to its internal policy. 6447 * 6448 * <p>This method should be overridden by views that wish to apply a policy different from or 6449 * in addition to the default behavior. Clients that wish to force a view subtree 6450 * to apply insets should call {@link #dispatchApplyWindowInsets(WindowInsets)}.</p> 6451 * 6452 * <p>Clients may supply an {@link OnApplyWindowInsetsListener} to a view. If one is set 6453 * it will be called during dispatch instead of this method. The listener may optionally 6454 * call this method from its own implementation if it wishes to apply the view's default 6455 * insets policy in addition to its own.</p> 6456 * 6457 * <p>Implementations of this method should either return the insets parameter unchanged 6458 * or a new {@link WindowInsets} cloned from the supplied insets with any insets consumed 6459 * that this view applied itself. This allows new inset types added in future platform 6460 * versions to pass through existing implementations unchanged without being erroneously 6461 * consumed.</p> 6462 * 6463 * <p>By default if a view's {@link #setFitsSystemWindows(boolean) fitsSystemWindows} 6464 * property is set then the view will consume the system window insets and apply them 6465 * as padding for the view.</p> 6466 * 6467 * @param insets Insets to apply 6468 * @return The supplied insets with any applied insets consumed 6469 */ 6470 public WindowInsets onApplyWindowInsets(WindowInsets insets) { 6471 if ((mPrivateFlags3 & PFLAG3_FITTING_SYSTEM_WINDOWS) == 0) { 6472 // We weren't called from within a direct call to fitSystemWindows, 6473 // call into it as a fallback in case we're in a class that overrides it 6474 // and has logic to perform. 6475 if (fitSystemWindows(insets.getSystemWindowInsets())) { 6476 return insets.consumeSystemWindowInsets(); 6477 } 6478 } else { 6479 // We were called from within a direct call to fitSystemWindows. 6480 if (fitSystemWindowsInt(insets.getSystemWindowInsets())) { 6481 return insets.consumeSystemWindowInsets(); 6482 } 6483 } 6484 return insets; 6485 } 6486 6487 /** 6488 * Set an {@link OnApplyWindowInsetsListener} to take over the policy for applying 6489 * window insets to this view. The listener's 6490 * {@link OnApplyWindowInsetsListener#onApplyWindowInsets(View, WindowInsets) onApplyWindowInsets} 6491 * method will be called instead of the view's 6492 * {@link #onApplyWindowInsets(WindowInsets) onApplyWindowInsets} method. 6493 * 6494 * @param listener Listener to set 6495 * 6496 * @see #onApplyWindowInsets(WindowInsets) 6497 */ 6498 public void setOnApplyWindowInsetsListener(OnApplyWindowInsetsListener listener) { 6499 getListenerInfo().mOnApplyWindowInsetsListener = listener; 6500 } 6501 6502 /** 6503 * Request to apply the given window insets to this view or another view in its subtree. 6504 * 6505 * <p>This method should be called by clients wishing to apply insets corresponding to areas 6506 * obscured by window decorations or overlays. This can include the status and navigation bars, 6507 * action bars, input methods and more. New inset categories may be added in the future. 6508 * The method returns the insets provided minus any that were applied by this view or its 6509 * children.</p> 6510 * 6511 * <p>Clients wishing to provide custom behavior should override the 6512 * {@link #onApplyWindowInsets(WindowInsets)} method or alternatively provide a 6513 * {@link OnApplyWindowInsetsListener} via the 6514 * {@link #setOnApplyWindowInsetsListener(View.OnApplyWindowInsetsListener) setOnApplyWindowInsetsListener} 6515 * method.</p> 6516 * 6517 * <p>This method replaces the older {@link #fitSystemWindows(Rect) fitSystemWindows} method. 6518 * </p> 6519 * 6520 * @param insets Insets to apply 6521 * @return The provided insets minus the insets that were consumed 6522 */ 6523 public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) { 6524 try { 6525 mPrivateFlags3 |= PFLAG3_APPLYING_INSETS; 6526 if (mListenerInfo != null && mListenerInfo.mOnApplyWindowInsetsListener != null) { 6527 return mListenerInfo.mOnApplyWindowInsetsListener.onApplyWindowInsets(this, insets); 6528 } else { 6529 return onApplyWindowInsets(insets); 6530 } 6531 } finally { 6532 mPrivateFlags3 &= ~PFLAG3_APPLYING_INSETS; 6533 } 6534 } 6535 6536 /** 6537 * @hide Compute the insets that should be consumed by this view and the ones 6538 * that should propagate to those under it. 6539 */ 6540 protected boolean computeFitSystemWindows(Rect inoutInsets, Rect outLocalInsets) { 6541 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 6542 || mAttachInfo == null 6543 || ((mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0 6544 && !mAttachInfo.mOverscanRequested)) { 6545 outLocalInsets.set(inoutInsets); 6546 inoutInsets.set(0, 0, 0, 0); 6547 return true; 6548 } else { 6549 // The application wants to take care of fitting system window for 6550 // the content... however we still need to take care of any overscan here. 6551 final Rect overscan = mAttachInfo.mOverscanInsets; 6552 outLocalInsets.set(overscan); 6553 inoutInsets.left -= overscan.left; 6554 inoutInsets.top -= overscan.top; 6555 inoutInsets.right -= overscan.right; 6556 inoutInsets.bottom -= overscan.bottom; 6557 return false; 6558 } 6559 } 6560 6561 /** 6562 * Compute insets that should be consumed by this view and the ones that should propagate 6563 * to those under it. 6564 * 6565 * @param in Insets currently being processed by this View, likely received as a parameter 6566 * to {@link #onApplyWindowInsets(WindowInsets)}. 6567 * @param outLocalInsets A Rect that will receive the insets that should be consumed 6568 * by this view 6569 * @return Insets that should be passed along to views under this one 6570 */ 6571 public WindowInsets computeSystemWindowInsets(WindowInsets in, Rect outLocalInsets) { 6572 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 6573 || mAttachInfo == null 6574 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 6575 outLocalInsets.set(in.getSystemWindowInsets()); 6576 return in.consumeSystemWindowInsets(); 6577 } else { 6578 outLocalInsets.set(0, 0, 0, 0); 6579 return in; 6580 } 6581 } 6582 6583 /** 6584 * Sets whether or not this view should account for system screen decorations 6585 * such as the status bar and inset its content; that is, controlling whether 6586 * the default implementation of {@link #fitSystemWindows(Rect)} will be 6587 * executed. See that method for more details. 6588 * 6589 * <p>Note that if you are providing your own implementation of 6590 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 6591 * flag to true -- your implementation will be overriding the default 6592 * implementation that checks this flag. 6593 * 6594 * @param fitSystemWindows If true, then the default implementation of 6595 * {@link #fitSystemWindows(Rect)} will be executed. 6596 * 6597 * @attr ref android.R.styleable#View_fitsSystemWindows 6598 * @see #getFitsSystemWindows() 6599 * @see #fitSystemWindows(Rect) 6600 * @see #setSystemUiVisibility(int) 6601 */ 6602 public void setFitsSystemWindows(boolean fitSystemWindows) { 6603 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 6604 } 6605 6606 /** 6607 * Check for state of {@link #setFitsSystemWindows(boolean)}. If this method 6608 * returns {@code true}, the default implementation of {@link #fitSystemWindows(Rect)} 6609 * will be executed. 6610 * 6611 * @return {@code true} if the default implementation of 6612 * {@link #fitSystemWindows(Rect)} will be executed. 6613 * 6614 * @attr ref android.R.styleable#View_fitsSystemWindows 6615 * @see #setFitsSystemWindows(boolean) 6616 * @see #fitSystemWindows(Rect) 6617 * @see #setSystemUiVisibility(int) 6618 */ 6619 @ViewDebug.ExportedProperty 6620 public boolean getFitsSystemWindows() { 6621 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 6622 } 6623 6624 /** @hide */ 6625 public boolean fitsSystemWindows() { 6626 return getFitsSystemWindows(); 6627 } 6628 6629 /** 6630 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 6631 * @deprecated Use {@link #requestApplyInsets()} for newer platform versions. 6632 */ 6633 public void requestFitSystemWindows() { 6634 if (mParent != null) { 6635 mParent.requestFitSystemWindows(); 6636 } 6637 } 6638 6639 /** 6640 * Ask that a new dispatch of {@link #onApplyWindowInsets(WindowInsets)} be performed. 6641 */ 6642 public void requestApplyInsets() { 6643 requestFitSystemWindows(); 6644 } 6645 6646 /** 6647 * For use by PhoneWindow to make its own system window fitting optional. 6648 * @hide 6649 */ 6650 public void makeOptionalFitsSystemWindows() { 6651 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 6652 } 6653 6654 /** 6655 * Returns the visibility status for this view. 6656 * 6657 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 6658 * @attr ref android.R.styleable#View_visibility 6659 */ 6660 @ViewDebug.ExportedProperty(mapping = { 6661 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 6662 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 6663 @ViewDebug.IntToString(from = GONE, to = "GONE") 6664 }) 6665 @Visibility 6666 public int getVisibility() { 6667 return mViewFlags & VISIBILITY_MASK; 6668 } 6669 6670 /** 6671 * Set the enabled state of this view. 6672 * 6673 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 6674 * @attr ref android.R.styleable#View_visibility 6675 */ 6676 @RemotableViewMethod 6677 public void setVisibility(@Visibility int visibility) { 6678 setFlags(visibility, VISIBILITY_MASK); 6679 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 6680 } 6681 6682 /** 6683 * Returns the enabled status for this view. The interpretation of the 6684 * enabled state varies by subclass. 6685 * 6686 * @return True if this view is enabled, false otherwise. 6687 */ 6688 @ViewDebug.ExportedProperty 6689 public boolean isEnabled() { 6690 return (mViewFlags & ENABLED_MASK) == ENABLED; 6691 } 6692 6693 /** 6694 * Set the enabled state of this view. The interpretation of the enabled 6695 * state varies by subclass. 6696 * 6697 * @param enabled True if this view is enabled, false otherwise. 6698 */ 6699 @RemotableViewMethod 6700 public void setEnabled(boolean enabled) { 6701 if (enabled == isEnabled()) return; 6702 6703 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 6704 6705 /* 6706 * The View most likely has to change its appearance, so refresh 6707 * the drawable state. 6708 */ 6709 refreshDrawableState(); 6710 6711 // Invalidate too, since the default behavior for views is to be 6712 // be drawn at 50% alpha rather than to change the drawable. 6713 invalidate(true); 6714 6715 if (!enabled) { 6716 cancelPendingInputEvents(); 6717 } 6718 } 6719 6720 /** 6721 * Set whether this view can receive the focus. 6722 * 6723 * Setting this to false will also ensure that this view is not focusable 6724 * in touch mode. 6725 * 6726 * @param focusable If true, this view can receive the focus. 6727 * 6728 * @see #setFocusableInTouchMode(boolean) 6729 * @attr ref android.R.styleable#View_focusable 6730 */ 6731 public void setFocusable(boolean focusable) { 6732 if (!focusable) { 6733 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 6734 } 6735 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 6736 } 6737 6738 /** 6739 * Set whether this view can receive focus while in touch mode. 6740 * 6741 * Setting this to true will also ensure that this view is focusable. 6742 * 6743 * @param focusableInTouchMode If true, this view can receive the focus while 6744 * in touch mode. 6745 * 6746 * @see #setFocusable(boolean) 6747 * @attr ref android.R.styleable#View_focusableInTouchMode 6748 */ 6749 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 6750 // Focusable in touch mode should always be set before the focusable flag 6751 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 6752 // which, in touch mode, will not successfully request focus on this view 6753 // because the focusable in touch mode flag is not set 6754 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 6755 if (focusableInTouchMode) { 6756 setFlags(FOCUSABLE, FOCUSABLE_MASK); 6757 } 6758 } 6759 6760 /** 6761 * Set whether this view should have sound effects enabled for events such as 6762 * clicking and touching. 6763 * 6764 * <p>You may wish to disable sound effects for a view if you already play sounds, 6765 * for instance, a dial key that plays dtmf tones. 6766 * 6767 * @param soundEffectsEnabled whether sound effects are enabled for this view. 6768 * @see #isSoundEffectsEnabled() 6769 * @see #playSoundEffect(int) 6770 * @attr ref android.R.styleable#View_soundEffectsEnabled 6771 */ 6772 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 6773 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 6774 } 6775 6776 /** 6777 * @return whether this view should have sound effects enabled for events such as 6778 * clicking and touching. 6779 * 6780 * @see #setSoundEffectsEnabled(boolean) 6781 * @see #playSoundEffect(int) 6782 * @attr ref android.R.styleable#View_soundEffectsEnabled 6783 */ 6784 @ViewDebug.ExportedProperty 6785 public boolean isSoundEffectsEnabled() { 6786 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 6787 } 6788 6789 /** 6790 * Set whether this view should have haptic feedback for events such as 6791 * long presses. 6792 * 6793 * <p>You may wish to disable haptic feedback if your view already controls 6794 * its own haptic feedback. 6795 * 6796 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 6797 * @see #isHapticFeedbackEnabled() 6798 * @see #performHapticFeedback(int) 6799 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 6800 */ 6801 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 6802 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 6803 } 6804 6805 /** 6806 * @return whether this view should have haptic feedback enabled for events 6807 * long presses. 6808 * 6809 * @see #setHapticFeedbackEnabled(boolean) 6810 * @see #performHapticFeedback(int) 6811 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 6812 */ 6813 @ViewDebug.ExportedProperty 6814 public boolean isHapticFeedbackEnabled() { 6815 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 6816 } 6817 6818 /** 6819 * Returns the layout direction for this view. 6820 * 6821 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 6822 * {@link #LAYOUT_DIRECTION_RTL}, 6823 * {@link #LAYOUT_DIRECTION_INHERIT} or 6824 * {@link #LAYOUT_DIRECTION_LOCALE}. 6825 * 6826 * @attr ref android.R.styleable#View_layoutDirection 6827 * 6828 * @hide 6829 */ 6830 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6831 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 6832 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 6833 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 6834 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 6835 }) 6836 @LayoutDir 6837 public int getRawLayoutDirection() { 6838 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 6839 } 6840 6841 /** 6842 * Set the layout direction for this view. This will propagate a reset of layout direction 6843 * resolution to the view's children and resolve layout direction for this view. 6844 * 6845 * @param layoutDirection the layout direction to set. Should be one of: 6846 * 6847 * {@link #LAYOUT_DIRECTION_LTR}, 6848 * {@link #LAYOUT_DIRECTION_RTL}, 6849 * {@link #LAYOUT_DIRECTION_INHERIT}, 6850 * {@link #LAYOUT_DIRECTION_LOCALE}. 6851 * 6852 * Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution 6853 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 6854 * will return the default {@link #LAYOUT_DIRECTION_LTR}. 6855 * 6856 * @attr ref android.R.styleable#View_layoutDirection 6857 */ 6858 @RemotableViewMethod 6859 public void setLayoutDirection(@LayoutDir int layoutDirection) { 6860 if (getRawLayoutDirection() != layoutDirection) { 6861 // Reset the current layout direction and the resolved one 6862 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK; 6863 resetRtlProperties(); 6864 // Set the new layout direction (filtered) 6865 mPrivateFlags2 |= 6866 ((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK); 6867 // We need to resolve all RTL properties as they all depend on layout direction 6868 resolveRtlPropertiesIfNeeded(); 6869 requestLayout(); 6870 invalidate(true); 6871 } 6872 } 6873 6874 /** 6875 * Returns the resolved layout direction for this view. 6876 * 6877 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 6878 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 6879 * 6880 * For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version 6881 * is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}. 6882 * 6883 * @attr ref android.R.styleable#View_layoutDirection 6884 */ 6885 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6886 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 6887 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 6888 }) 6889 @ResolvedLayoutDir 6890 public int getLayoutDirection() { 6891 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 6892 if (targetSdkVersion < JELLY_BEAN_MR1) { 6893 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 6894 return LAYOUT_DIRECTION_RESOLVED_DEFAULT; 6895 } 6896 return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) == 6897 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 6898 } 6899 6900 /** 6901 * Indicates whether or not this view's layout is right-to-left. This is resolved from 6902 * layout attribute and/or the inherited value from the parent 6903 * 6904 * @return true if the layout is right-to-left. 6905 * 6906 * @hide 6907 */ 6908 @ViewDebug.ExportedProperty(category = "layout") 6909 public boolean isLayoutRtl() { 6910 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL); 6911 } 6912 6913 /** 6914 * Indicates whether the view is currently tracking transient state that the 6915 * app should not need to concern itself with saving and restoring, but that 6916 * the framework should take special note to preserve when possible. 6917 * 6918 * <p>A view with transient state cannot be trivially rebound from an external 6919 * data source, such as an adapter binding item views in a list. This may be 6920 * because the view is performing an animation, tracking user selection 6921 * of content, or similar.</p> 6922 * 6923 * @return true if the view has transient state 6924 */ 6925 @ViewDebug.ExportedProperty(category = "layout") 6926 public boolean hasTransientState() { 6927 return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE; 6928 } 6929 6930 /** 6931 * Set whether this view is currently tracking transient state that the 6932 * framework should attempt to preserve when possible. This flag is reference counted, 6933 * so every call to setHasTransientState(true) should be paired with a later call 6934 * to setHasTransientState(false). 6935 * 6936 * <p>A view with transient state cannot be trivially rebound from an external 6937 * data source, such as an adapter binding item views in a list. This may be 6938 * because the view is performing an animation, tracking user selection 6939 * of content, or similar.</p> 6940 * 6941 * @param hasTransientState true if this view has transient state 6942 */ 6943 public void setHasTransientState(boolean hasTransientState) { 6944 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 6945 mTransientStateCount - 1; 6946 if (mTransientStateCount < 0) { 6947 mTransientStateCount = 0; 6948 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 6949 "unmatched pair of setHasTransientState calls"); 6950 } else if ((hasTransientState && mTransientStateCount == 1) || 6951 (!hasTransientState && mTransientStateCount == 0)) { 6952 // update flag if we've just incremented up from 0 or decremented down to 0 6953 mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) | 6954 (hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0); 6955 if (mParent != null) { 6956 try { 6957 mParent.childHasTransientStateChanged(this, hasTransientState); 6958 } catch (AbstractMethodError e) { 6959 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 6960 " does not fully implement ViewParent", e); 6961 } 6962 } 6963 } 6964 } 6965 6966 /** 6967 * Returns true if this view is currently attached to a window. 6968 */ 6969 public boolean isAttachedToWindow() { 6970 return mAttachInfo != null; 6971 } 6972 6973 /** 6974 * Returns true if this view has been through at least one layout since it 6975 * was last attached to or detached from a window. 6976 */ 6977 public boolean isLaidOut() { 6978 return (mPrivateFlags3 & PFLAG3_IS_LAID_OUT) == PFLAG3_IS_LAID_OUT; 6979 } 6980 6981 /** 6982 * If this view doesn't do any drawing on its own, set this flag to 6983 * allow further optimizations. By default, this flag is not set on 6984 * View, but could be set on some View subclasses such as ViewGroup. 6985 * 6986 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 6987 * you should clear this flag. 6988 * 6989 * @param willNotDraw whether or not this View draw on its own 6990 */ 6991 public void setWillNotDraw(boolean willNotDraw) { 6992 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 6993 } 6994 6995 /** 6996 * Returns whether or not this View draws on its own. 6997 * 6998 * @return true if this view has nothing to draw, false otherwise 6999 */ 7000 @ViewDebug.ExportedProperty(category = "drawing") 7001 public boolean willNotDraw() { 7002 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 7003 } 7004 7005 /** 7006 * When a View's drawing cache is enabled, drawing is redirected to an 7007 * offscreen bitmap. Some views, like an ImageView, must be able to 7008 * bypass this mechanism if they already draw a single bitmap, to avoid 7009 * unnecessary usage of the memory. 7010 * 7011 * @param willNotCacheDrawing true if this view does not cache its 7012 * drawing, false otherwise 7013 */ 7014 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 7015 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 7016 } 7017 7018 /** 7019 * Returns whether or not this View can cache its drawing or not. 7020 * 7021 * @return true if this view does not cache its drawing, false otherwise 7022 */ 7023 @ViewDebug.ExportedProperty(category = "drawing") 7024 public boolean willNotCacheDrawing() { 7025 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 7026 } 7027 7028 /** 7029 * Indicates whether this view reacts to click events or not. 7030 * 7031 * @return true if the view is clickable, false otherwise 7032 * 7033 * @see #setClickable(boolean) 7034 * @attr ref android.R.styleable#View_clickable 7035 */ 7036 @ViewDebug.ExportedProperty 7037 public boolean isClickable() { 7038 return (mViewFlags & CLICKABLE) == CLICKABLE; 7039 } 7040 7041 /** 7042 * Enables or disables click events for this view. When a view 7043 * is clickable it will change its state to "pressed" on every click. 7044 * Subclasses should set the view clickable to visually react to 7045 * user's clicks. 7046 * 7047 * @param clickable true to make the view clickable, false otherwise 7048 * 7049 * @see #isClickable() 7050 * @attr ref android.R.styleable#View_clickable 7051 */ 7052 public void setClickable(boolean clickable) { 7053 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 7054 } 7055 7056 /** 7057 * Indicates whether this view reacts to long click events or not. 7058 * 7059 * @return true if the view is long clickable, false otherwise 7060 * 7061 * @see #setLongClickable(boolean) 7062 * @attr ref android.R.styleable#View_longClickable 7063 */ 7064 public boolean isLongClickable() { 7065 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7066 } 7067 7068 /** 7069 * Enables or disables long click events for this view. When a view is long 7070 * clickable it reacts to the user holding down the button for a longer 7071 * duration than a tap. This event can either launch the listener or a 7072 * context menu. 7073 * 7074 * @param longClickable true to make the view long clickable, false otherwise 7075 * @see #isLongClickable() 7076 * @attr ref android.R.styleable#View_longClickable 7077 */ 7078 public void setLongClickable(boolean longClickable) { 7079 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 7080 } 7081 7082 /** 7083 * Sets the pressed state for this view and provides a touch coordinate for 7084 * animation hinting. 7085 * 7086 * @param pressed Pass true to set the View's internal state to "pressed", 7087 * or false to reverts the View's internal state from a 7088 * previously set "pressed" state. 7089 * @param x The x coordinate of the touch that caused the press 7090 * @param y The y coordinate of the touch that caused the press 7091 */ 7092 private void setPressed(boolean pressed, float x, float y) { 7093 if (pressed) { 7094 drawableHotspotChanged(x, y); 7095 } 7096 7097 setPressed(pressed); 7098 } 7099 7100 /** 7101 * Sets the pressed state for this view. 7102 * 7103 * @see #isClickable() 7104 * @see #setClickable(boolean) 7105 * 7106 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 7107 * the View's internal state from a previously set "pressed" state. 7108 */ 7109 public void setPressed(boolean pressed) { 7110 final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED); 7111 7112 if (pressed) { 7113 mPrivateFlags |= PFLAG_PRESSED; 7114 } else { 7115 mPrivateFlags &= ~PFLAG_PRESSED; 7116 } 7117 7118 if (needsRefresh) { 7119 refreshDrawableState(); 7120 } 7121 dispatchSetPressed(pressed); 7122 } 7123 7124 /** 7125 * Dispatch setPressed to all of this View's children. 7126 * 7127 * @see #setPressed(boolean) 7128 * 7129 * @param pressed The new pressed state 7130 */ 7131 protected void dispatchSetPressed(boolean pressed) { 7132 } 7133 7134 /** 7135 * Indicates whether the view is currently in pressed state. Unless 7136 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 7137 * the pressed state. 7138 * 7139 * @see #setPressed(boolean) 7140 * @see #isClickable() 7141 * @see #setClickable(boolean) 7142 * 7143 * @return true if the view is currently pressed, false otherwise 7144 */ 7145 @ViewDebug.ExportedProperty 7146 public boolean isPressed() { 7147 return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED; 7148 } 7149 7150 /** 7151 * Indicates whether this view will save its state (that is, 7152 * whether its {@link #onSaveInstanceState} method will be called). 7153 * 7154 * @return Returns true if the view state saving is enabled, else false. 7155 * 7156 * @see #setSaveEnabled(boolean) 7157 * @attr ref android.R.styleable#View_saveEnabled 7158 */ 7159 public boolean isSaveEnabled() { 7160 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 7161 } 7162 7163 /** 7164 * Controls whether the saving of this view's state is 7165 * enabled (that is, whether its {@link #onSaveInstanceState} method 7166 * will be called). Note that even if freezing is enabled, the 7167 * view still must have an id assigned to it (via {@link #setId(int)}) 7168 * for its state to be saved. This flag can only disable the 7169 * saving of this view; any child views may still have their state saved. 7170 * 7171 * @param enabled Set to false to <em>disable</em> state saving, or true 7172 * (the default) to allow it. 7173 * 7174 * @see #isSaveEnabled() 7175 * @see #setId(int) 7176 * @see #onSaveInstanceState() 7177 * @attr ref android.R.styleable#View_saveEnabled 7178 */ 7179 public void setSaveEnabled(boolean enabled) { 7180 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 7181 } 7182 7183 /** 7184 * Gets whether the framework should discard touches when the view's 7185 * window is obscured by another visible window. 7186 * Refer to the {@link View} security documentation for more details. 7187 * 7188 * @return True if touch filtering is enabled. 7189 * 7190 * @see #setFilterTouchesWhenObscured(boolean) 7191 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 7192 */ 7193 @ViewDebug.ExportedProperty 7194 public boolean getFilterTouchesWhenObscured() { 7195 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 7196 } 7197 7198 /** 7199 * Sets whether the framework should discard touches when the view's 7200 * window is obscured by another visible window. 7201 * Refer to the {@link View} security documentation for more details. 7202 * 7203 * @param enabled True if touch filtering should be enabled. 7204 * 7205 * @see #getFilterTouchesWhenObscured 7206 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 7207 */ 7208 public void setFilterTouchesWhenObscured(boolean enabled) { 7209 setFlags(enabled ? FILTER_TOUCHES_WHEN_OBSCURED : 0, 7210 FILTER_TOUCHES_WHEN_OBSCURED); 7211 } 7212 7213 /** 7214 * Indicates whether the entire hierarchy under this view will save its 7215 * state when a state saving traversal occurs from its parent. The default 7216 * is true; if false, these views will not be saved unless 7217 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 7218 * 7219 * @return Returns true if the view state saving from parent is enabled, else false. 7220 * 7221 * @see #setSaveFromParentEnabled(boolean) 7222 */ 7223 public boolean isSaveFromParentEnabled() { 7224 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 7225 } 7226 7227 /** 7228 * Controls whether the entire hierarchy under this view will save its 7229 * state when a state saving traversal occurs from its parent. The default 7230 * is true; if false, these views will not be saved unless 7231 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 7232 * 7233 * @param enabled Set to false to <em>disable</em> state saving, or true 7234 * (the default) to allow it. 7235 * 7236 * @see #isSaveFromParentEnabled() 7237 * @see #setId(int) 7238 * @see #onSaveInstanceState() 7239 */ 7240 public void setSaveFromParentEnabled(boolean enabled) { 7241 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 7242 } 7243 7244 7245 /** 7246 * Returns whether this View is able to take focus. 7247 * 7248 * @return True if this view can take focus, or false otherwise. 7249 * @attr ref android.R.styleable#View_focusable 7250 */ 7251 @ViewDebug.ExportedProperty(category = "focus") 7252 public final boolean isFocusable() { 7253 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 7254 } 7255 7256 /** 7257 * When a view is focusable, it may not want to take focus when in touch mode. 7258 * For example, a button would like focus when the user is navigating via a D-pad 7259 * so that the user can click on it, but once the user starts touching the screen, 7260 * the button shouldn't take focus 7261 * @return Whether the view is focusable in touch mode. 7262 * @attr ref android.R.styleable#View_focusableInTouchMode 7263 */ 7264 @ViewDebug.ExportedProperty 7265 public final boolean isFocusableInTouchMode() { 7266 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 7267 } 7268 7269 /** 7270 * Find the nearest view in the specified direction that can take focus. 7271 * This does not actually give focus to that view. 7272 * 7273 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 7274 * 7275 * @return The nearest focusable in the specified direction, or null if none 7276 * can be found. 7277 */ 7278 public View focusSearch(@FocusRealDirection int direction) { 7279 if (mParent != null) { 7280 return mParent.focusSearch(this, direction); 7281 } else { 7282 return null; 7283 } 7284 } 7285 7286 /** 7287 * This method is the last chance for the focused view and its ancestors to 7288 * respond to an arrow key. This is called when the focused view did not 7289 * consume the key internally, nor could the view system find a new view in 7290 * the requested direction to give focus to. 7291 * 7292 * @param focused The currently focused view. 7293 * @param direction The direction focus wants to move. One of FOCUS_UP, 7294 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 7295 * @return True if the this view consumed this unhandled move. 7296 */ 7297 public boolean dispatchUnhandledMove(View focused, @FocusRealDirection int direction) { 7298 return false; 7299 } 7300 7301 /** 7302 * If a user manually specified the next view id for a particular direction, 7303 * use the root to look up the view. 7304 * @param root The root view of the hierarchy containing this view. 7305 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 7306 * or FOCUS_BACKWARD. 7307 * @return The user specified next view, or null if there is none. 7308 */ 7309 View findUserSetNextFocus(View root, @FocusDirection int direction) { 7310 switch (direction) { 7311 case FOCUS_LEFT: 7312 if (mNextFocusLeftId == View.NO_ID) return null; 7313 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 7314 case FOCUS_RIGHT: 7315 if (mNextFocusRightId == View.NO_ID) return null; 7316 return findViewInsideOutShouldExist(root, mNextFocusRightId); 7317 case FOCUS_UP: 7318 if (mNextFocusUpId == View.NO_ID) return null; 7319 return findViewInsideOutShouldExist(root, mNextFocusUpId); 7320 case FOCUS_DOWN: 7321 if (mNextFocusDownId == View.NO_ID) return null; 7322 return findViewInsideOutShouldExist(root, mNextFocusDownId); 7323 case FOCUS_FORWARD: 7324 if (mNextFocusForwardId == View.NO_ID) return null; 7325 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 7326 case FOCUS_BACKWARD: { 7327 if (mID == View.NO_ID) return null; 7328 final int id = mID; 7329 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 7330 @Override 7331 public boolean apply(View t) { 7332 return t.mNextFocusForwardId == id; 7333 } 7334 }); 7335 } 7336 } 7337 return null; 7338 } 7339 7340 private View findViewInsideOutShouldExist(View root, int id) { 7341 if (mMatchIdPredicate == null) { 7342 mMatchIdPredicate = new MatchIdPredicate(); 7343 } 7344 mMatchIdPredicate.mId = id; 7345 View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate); 7346 if (result == null) { 7347 Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id); 7348 } 7349 return result; 7350 } 7351 7352 /** 7353 * Find and return all focusable views that are descendants of this view, 7354 * possibly including this view if it is focusable itself. 7355 * 7356 * @param direction The direction of the focus 7357 * @return A list of focusable views 7358 */ 7359 public ArrayList<View> getFocusables(@FocusDirection int direction) { 7360 ArrayList<View> result = new ArrayList<View>(24); 7361 addFocusables(result, direction); 7362 return result; 7363 } 7364 7365 /** 7366 * Add any focusable views that are descendants of this view (possibly 7367 * including this view if it is focusable itself) to views. If we are in touch mode, 7368 * only add views that are also focusable in touch mode. 7369 * 7370 * @param views Focusable views found so far 7371 * @param direction The direction of the focus 7372 */ 7373 public void addFocusables(ArrayList<View> views, @FocusDirection int direction) { 7374 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 7375 } 7376 7377 /** 7378 * Adds any focusable views that are descendants of this view (possibly 7379 * including this view if it is focusable itself) to views. This method 7380 * adds all focusable views regardless if we are in touch mode or 7381 * only views focusable in touch mode if we are in touch mode or 7382 * only views that can take accessibility focus if accessibility is enabeld 7383 * depending on the focusable mode paramater. 7384 * 7385 * @param views Focusable views found so far or null if all we are interested is 7386 * the number of focusables. 7387 * @param direction The direction of the focus. 7388 * @param focusableMode The type of focusables to be added. 7389 * 7390 * @see #FOCUSABLES_ALL 7391 * @see #FOCUSABLES_TOUCH_MODE 7392 */ 7393 public void addFocusables(ArrayList<View> views, @FocusDirection int direction, 7394 @FocusableMode int focusableMode) { 7395 if (views == null) { 7396 return; 7397 } 7398 if (!isFocusable()) { 7399 return; 7400 } 7401 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 7402 && isInTouchMode() && !isFocusableInTouchMode()) { 7403 return; 7404 } 7405 views.add(this); 7406 } 7407 7408 /** 7409 * Finds the Views that contain given text. The containment is case insensitive. 7410 * The search is performed by either the text that the View renders or the content 7411 * description that describes the view for accessibility purposes and the view does 7412 * not render or both. Clients can specify how the search is to be performed via 7413 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 7414 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 7415 * 7416 * @param outViews The output list of matching Views. 7417 * @param searched The text to match against. 7418 * 7419 * @see #FIND_VIEWS_WITH_TEXT 7420 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 7421 * @see #setContentDescription(CharSequence) 7422 */ 7423 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, 7424 @FindViewFlags int flags) { 7425 if (getAccessibilityNodeProvider() != null) { 7426 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 7427 outViews.add(this); 7428 } 7429 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 7430 && (searched != null && searched.length() > 0) 7431 && (mContentDescription != null && mContentDescription.length() > 0)) { 7432 String searchedLowerCase = searched.toString().toLowerCase(); 7433 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 7434 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 7435 outViews.add(this); 7436 } 7437 } 7438 } 7439 7440 /** 7441 * Find and return all touchable views that are descendants of this view, 7442 * possibly including this view if it is touchable itself. 7443 * 7444 * @return A list of touchable views 7445 */ 7446 public ArrayList<View> getTouchables() { 7447 ArrayList<View> result = new ArrayList<View>(); 7448 addTouchables(result); 7449 return result; 7450 } 7451 7452 /** 7453 * Add any touchable views that are descendants of this view (possibly 7454 * including this view if it is touchable itself) to views. 7455 * 7456 * @param views Touchable views found so far 7457 */ 7458 public void addTouchables(ArrayList<View> views) { 7459 final int viewFlags = mViewFlags; 7460 7461 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 7462 && (viewFlags & ENABLED_MASK) == ENABLED) { 7463 views.add(this); 7464 } 7465 } 7466 7467 /** 7468 * Returns whether this View is accessibility focused. 7469 * 7470 * @return True if this View is accessibility focused. 7471 */ 7472 public boolean isAccessibilityFocused() { 7473 return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0; 7474 } 7475 7476 /** 7477 * Call this to try to give accessibility focus to this view. 7478 * 7479 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 7480 * returns false or the view is no visible or the view already has accessibility 7481 * focus. 7482 * 7483 * See also {@link #focusSearch(int)}, which is what you call to say that you 7484 * have focus, and you want your parent to look for the next one. 7485 * 7486 * @return Whether this view actually took accessibility focus. 7487 * 7488 * @hide 7489 */ 7490 public boolean requestAccessibilityFocus() { 7491 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 7492 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 7493 return false; 7494 } 7495 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 7496 return false; 7497 } 7498 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) { 7499 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED; 7500 ViewRootImpl viewRootImpl = getViewRootImpl(); 7501 if (viewRootImpl != null) { 7502 viewRootImpl.setAccessibilityFocus(this, null); 7503 } 7504 invalidate(); 7505 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 7506 return true; 7507 } 7508 return false; 7509 } 7510 7511 /** 7512 * Call this to try to clear accessibility focus of this view. 7513 * 7514 * See also {@link #focusSearch(int)}, which is what you call to say that you 7515 * have focus, and you want your parent to look for the next one. 7516 * 7517 * @hide 7518 */ 7519 public void clearAccessibilityFocus() { 7520 clearAccessibilityFocusNoCallbacks(); 7521 // Clear the global reference of accessibility focus if this 7522 // view or any of its descendants had accessibility focus. 7523 ViewRootImpl viewRootImpl = getViewRootImpl(); 7524 if (viewRootImpl != null) { 7525 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 7526 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 7527 viewRootImpl.setAccessibilityFocus(null, null); 7528 } 7529 } 7530 } 7531 7532 private void sendAccessibilityHoverEvent(int eventType) { 7533 // Since we are not delivering to a client accessibility events from not 7534 // important views (unless the clinet request that) we need to fire the 7535 // event from the deepest view exposed to the client. As a consequence if 7536 // the user crosses a not exposed view the client will see enter and exit 7537 // of the exposed predecessor followed by and enter and exit of that same 7538 // predecessor when entering and exiting the not exposed descendant. This 7539 // is fine since the client has a clear idea which view is hovered at the 7540 // price of a couple more events being sent. This is a simple and 7541 // working solution. 7542 View source = this; 7543 while (true) { 7544 if (source.includeForAccessibility()) { 7545 source.sendAccessibilityEvent(eventType); 7546 return; 7547 } 7548 ViewParent parent = source.getParent(); 7549 if (parent instanceof View) { 7550 source = (View) parent; 7551 } else { 7552 return; 7553 } 7554 } 7555 } 7556 7557 /** 7558 * Clears accessibility focus without calling any callback methods 7559 * normally invoked in {@link #clearAccessibilityFocus()}. This method 7560 * is used for clearing accessibility focus when giving this focus to 7561 * another view. 7562 */ 7563 void clearAccessibilityFocusNoCallbacks() { 7564 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { 7565 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; 7566 invalidate(); 7567 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 7568 } 7569 } 7570 7571 /** 7572 * Call this to try to give focus to a specific view or to one of its 7573 * descendants. 7574 * 7575 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 7576 * false), or if it is focusable and it is not focusable in touch mode 7577 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 7578 * 7579 * See also {@link #focusSearch(int)}, which is what you call to say that you 7580 * have focus, and you want your parent to look for the next one. 7581 * 7582 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 7583 * {@link #FOCUS_DOWN} and <code>null</code>. 7584 * 7585 * @return Whether this view or one of its descendants actually took focus. 7586 */ 7587 public final boolean requestFocus() { 7588 return requestFocus(View.FOCUS_DOWN); 7589 } 7590 7591 /** 7592 * Call this to try to give focus to a specific view or to one of its 7593 * descendants and give it a hint about what direction focus is heading. 7594 * 7595 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 7596 * false), or if it is focusable and it is not focusable in touch mode 7597 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 7598 * 7599 * See also {@link #focusSearch(int)}, which is what you call to say that you 7600 * have focus, and you want your parent to look for the next one. 7601 * 7602 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 7603 * <code>null</code> set for the previously focused rectangle. 7604 * 7605 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 7606 * @return Whether this view or one of its descendants actually took focus. 7607 */ 7608 public final boolean requestFocus(int direction) { 7609 return requestFocus(direction, null); 7610 } 7611 7612 /** 7613 * Call this to try to give focus to a specific view or to one of its descendants 7614 * and give it hints about the direction and a specific rectangle that the focus 7615 * is coming from. The rectangle can help give larger views a finer grained hint 7616 * about where focus is coming from, and therefore, where to show selection, or 7617 * forward focus change internally. 7618 * 7619 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 7620 * false), or if it is focusable and it is not focusable in touch mode 7621 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 7622 * 7623 * A View will not take focus if it is not visible. 7624 * 7625 * A View will not take focus if one of its parents has 7626 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 7627 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 7628 * 7629 * See also {@link #focusSearch(int)}, which is what you call to say that you 7630 * have focus, and you want your parent to look for the next one. 7631 * 7632 * You may wish to override this method if your custom {@link View} has an internal 7633 * {@link View} that it wishes to forward the request to. 7634 * 7635 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 7636 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 7637 * to give a finer grained hint about where focus is coming from. May be null 7638 * if there is no hint. 7639 * @return Whether this view or one of its descendants actually took focus. 7640 */ 7641 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 7642 return requestFocusNoSearch(direction, previouslyFocusedRect); 7643 } 7644 7645 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 7646 // need to be focusable 7647 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 7648 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 7649 return false; 7650 } 7651 7652 // need to be focusable in touch mode if in touch mode 7653 if (isInTouchMode() && 7654 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 7655 return false; 7656 } 7657 7658 // need to not have any parents blocking us 7659 if (hasAncestorThatBlocksDescendantFocus()) { 7660 return false; 7661 } 7662 7663 handleFocusGainInternal(direction, previouslyFocusedRect); 7664 return true; 7665 } 7666 7667 /** 7668 * Call this to try to give focus to a specific view or to one of its descendants. This is a 7669 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 7670 * touch mode to request focus when they are touched. 7671 * 7672 * @return Whether this view or one of its descendants actually took focus. 7673 * 7674 * @see #isInTouchMode() 7675 * 7676 */ 7677 public final boolean requestFocusFromTouch() { 7678 // Leave touch mode if we need to 7679 if (isInTouchMode()) { 7680 ViewRootImpl viewRoot = getViewRootImpl(); 7681 if (viewRoot != null) { 7682 viewRoot.ensureTouchMode(false); 7683 } 7684 } 7685 return requestFocus(View.FOCUS_DOWN); 7686 } 7687 7688 /** 7689 * @return Whether any ancestor of this view blocks descendant focus. 7690 */ 7691 private boolean hasAncestorThatBlocksDescendantFocus() { 7692 final boolean focusableInTouchMode = isFocusableInTouchMode(); 7693 ViewParent ancestor = mParent; 7694 while (ancestor instanceof ViewGroup) { 7695 final ViewGroup vgAncestor = (ViewGroup) ancestor; 7696 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS 7697 || (!focusableInTouchMode && vgAncestor.shouldBlockFocusForTouchscreen())) { 7698 return true; 7699 } else { 7700 ancestor = vgAncestor.getParent(); 7701 } 7702 } 7703 return false; 7704 } 7705 7706 /** 7707 * Gets the mode for determining whether this View is important for accessibility 7708 * which is if it fires accessibility events and if it is reported to 7709 * accessibility services that query the screen. 7710 * 7711 * @return The mode for determining whether a View is important for accessibility. 7712 * 7713 * @attr ref android.R.styleable#View_importantForAccessibility 7714 * 7715 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 7716 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 7717 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS 7718 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 7719 */ 7720 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 7721 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), 7722 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), 7723 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no"), 7724 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS, 7725 to = "noHideDescendants") 7726 }) 7727 public int getImportantForAccessibility() { 7728 return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 7729 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 7730 } 7731 7732 /** 7733 * Sets the live region mode for this view. This indicates to accessibility 7734 * services whether they should automatically notify the user about changes 7735 * to the view's content description or text, or to the content descriptions 7736 * or text of the view's children (where applicable). 7737 * <p> 7738 * For example, in a login screen with a TextView that displays an "incorrect 7739 * password" notification, that view should be marked as a live region with 7740 * mode {@link #ACCESSIBILITY_LIVE_REGION_POLITE}. 7741 * <p> 7742 * To disable change notifications for this view, use 7743 * {@link #ACCESSIBILITY_LIVE_REGION_NONE}. This is the default live region 7744 * mode for most views. 7745 * <p> 7746 * To indicate that the user should be notified of changes, use 7747 * {@link #ACCESSIBILITY_LIVE_REGION_POLITE}. 7748 * <p> 7749 * If the view's changes should interrupt ongoing speech and notify the user 7750 * immediately, use {@link #ACCESSIBILITY_LIVE_REGION_ASSERTIVE}. 7751 * 7752 * @param mode The live region mode for this view, one of: 7753 * <ul> 7754 * <li>{@link #ACCESSIBILITY_LIVE_REGION_NONE} 7755 * <li>{@link #ACCESSIBILITY_LIVE_REGION_POLITE} 7756 * <li>{@link #ACCESSIBILITY_LIVE_REGION_ASSERTIVE} 7757 * </ul> 7758 * @attr ref android.R.styleable#View_accessibilityLiveRegion 7759 */ 7760 public void setAccessibilityLiveRegion(int mode) { 7761 if (mode != getAccessibilityLiveRegion()) { 7762 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK; 7763 mPrivateFlags2 |= (mode << PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT) 7764 & PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK; 7765 notifyViewAccessibilityStateChangedIfNeeded( 7766 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 7767 } 7768 } 7769 7770 /** 7771 * Gets the live region mode for this View. 7772 * 7773 * @return The live region mode for the view. 7774 * 7775 * @attr ref android.R.styleable#View_accessibilityLiveRegion 7776 * 7777 * @see #setAccessibilityLiveRegion(int) 7778 */ 7779 public int getAccessibilityLiveRegion() { 7780 return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK) 7781 >> PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT; 7782 } 7783 7784 /** 7785 * Sets how to determine whether this view is important for accessibility 7786 * which is if it fires accessibility events and if it is reported to 7787 * accessibility services that query the screen. 7788 * 7789 * @param mode How to determine whether this view is important for accessibility. 7790 * 7791 * @attr ref android.R.styleable#View_importantForAccessibility 7792 * 7793 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 7794 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 7795 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS 7796 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 7797 */ 7798 public void setImportantForAccessibility(int mode) { 7799 final int oldMode = getImportantForAccessibility(); 7800 if (mode != oldMode) { 7801 // If we're moving between AUTO and another state, we might not need 7802 // to send a subtree changed notification. We'll store the computed 7803 // importance, since we'll need to check it later to make sure. 7804 final boolean maySkipNotify = oldMode == IMPORTANT_FOR_ACCESSIBILITY_AUTO 7805 || mode == IMPORTANT_FOR_ACCESSIBILITY_AUTO; 7806 final boolean oldIncludeForAccessibility = maySkipNotify && includeForAccessibility(); 7807 mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 7808 mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 7809 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 7810 if (!maySkipNotify || oldIncludeForAccessibility != includeForAccessibility()) { 7811 notifySubtreeAccessibilityStateChangedIfNeeded(); 7812 } else { 7813 notifyViewAccessibilityStateChangedIfNeeded( 7814 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 7815 } 7816 } 7817 } 7818 7819 /** 7820 * Computes whether this view should be exposed for accessibility. In 7821 * general, views that are interactive or provide information are exposed 7822 * while views that serve only as containers are hidden. 7823 * <p> 7824 * If an ancestor of this view has importance 7825 * {@link #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS}, this method 7826 * returns <code>false</code>. 7827 * <p> 7828 * Otherwise, the value is computed according to the view's 7829 * {@link #getImportantForAccessibility()} value: 7830 * <ol> 7831 * <li>{@link #IMPORTANT_FOR_ACCESSIBILITY_NO} or 7832 * {@link #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS}, return <code>false 7833 * </code> 7834 * <li>{@link #IMPORTANT_FOR_ACCESSIBILITY_YES}, return <code>true</code> 7835 * <li>{@link #IMPORTANT_FOR_ACCESSIBILITY_AUTO}, return <code>true</code> if 7836 * view satisfies any of the following: 7837 * <ul> 7838 * <li>Is actionable, e.g. {@link #isClickable()}, 7839 * {@link #isLongClickable()}, or {@link #isFocusable()} 7840 * <li>Has an {@link AccessibilityDelegate} 7841 * <li>Has an interaction listener, e.g. {@link OnTouchListener}, 7842 * {@link OnKeyListener}, etc. 7843 * <li>Is an accessibility live region, e.g. 7844 * {@link #getAccessibilityLiveRegion()} is not 7845 * {@link #ACCESSIBILITY_LIVE_REGION_NONE}. 7846 * </ul> 7847 * </ol> 7848 * 7849 * @return Whether the view is exposed for accessibility. 7850 * @see #setImportantForAccessibility(int) 7851 * @see #getImportantForAccessibility() 7852 */ 7853 public boolean isImportantForAccessibility() { 7854 final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 7855 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 7856 if (mode == IMPORTANT_FOR_ACCESSIBILITY_NO 7857 || mode == IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) { 7858 return false; 7859 } 7860 7861 // Check parent mode to ensure we're not hidden. 7862 ViewParent parent = mParent; 7863 while (parent instanceof View) { 7864 if (((View) parent).getImportantForAccessibility() 7865 == IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) { 7866 return false; 7867 } 7868 parent = parent.getParent(); 7869 } 7870 7871 return mode == IMPORTANT_FOR_ACCESSIBILITY_YES || isActionableForAccessibility() 7872 || hasListenersForAccessibility() || getAccessibilityNodeProvider() != null 7873 || getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE; 7874 } 7875 7876 /** 7877 * Gets the parent for accessibility purposes. Note that the parent for 7878 * accessibility is not necessary the immediate parent. It is the first 7879 * predecessor that is important for accessibility. 7880 * 7881 * @return The parent for accessibility purposes. 7882 */ 7883 public ViewParent getParentForAccessibility() { 7884 if (mParent instanceof View) { 7885 View parentView = (View) mParent; 7886 if (parentView.includeForAccessibility()) { 7887 return mParent; 7888 } else { 7889 return mParent.getParentForAccessibility(); 7890 } 7891 } 7892 return null; 7893 } 7894 7895 /** 7896 * Adds the children of a given View for accessibility. Since some Views are 7897 * not important for accessibility the children for accessibility are not 7898 * necessarily direct children of the view, rather they are the first level of 7899 * descendants important for accessibility. 7900 * 7901 * @param children The list of children for accessibility. 7902 */ 7903 public void addChildrenForAccessibility(ArrayList<View> children) { 7904 7905 } 7906 7907 /** 7908 * Whether to regard this view for accessibility. A view is regarded for 7909 * accessibility if it is important for accessibility or the querying 7910 * accessibility service has explicitly requested that view not 7911 * important for accessibility are regarded. 7912 * 7913 * @return Whether to regard the view for accessibility. 7914 * 7915 * @hide 7916 */ 7917 public boolean includeForAccessibility() { 7918 if (mAttachInfo != null) { 7919 return (mAttachInfo.mAccessibilityFetchFlags 7920 & AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0 7921 || isImportantForAccessibility(); 7922 } 7923 return false; 7924 } 7925 7926 /** 7927 * Returns whether the View is considered actionable from 7928 * accessibility perspective. Such view are important for 7929 * accessibility. 7930 * 7931 * @return True if the view is actionable for accessibility. 7932 * 7933 * @hide 7934 */ 7935 public boolean isActionableForAccessibility() { 7936 return (isClickable() || isLongClickable() || isFocusable()); 7937 } 7938 7939 /** 7940 * Returns whether the View has registered callbacks which makes it 7941 * important for accessibility. 7942 * 7943 * @return True if the view is actionable for accessibility. 7944 */ 7945 private boolean hasListenersForAccessibility() { 7946 ListenerInfo info = getListenerInfo(); 7947 return mTouchDelegate != null || info.mOnKeyListener != null 7948 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 7949 || info.mOnHoverListener != null || info.mOnDragListener != null; 7950 } 7951 7952 /** 7953 * Notifies that the accessibility state of this view changed. The change 7954 * is local to this view and does not represent structural changes such 7955 * as children and parent. For example, the view became focusable. The 7956 * notification is at at most once every 7957 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 7958 * to avoid unnecessary load to the system. Also once a view has a pending 7959 * notification this method is a NOP until the notification has been sent. 7960 * 7961 * @hide 7962 */ 7963 public void notifyViewAccessibilityStateChangedIfNeeded(int changeType) { 7964 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 7965 return; 7966 } 7967 if (mSendViewStateChangedAccessibilityEvent == null) { 7968 mSendViewStateChangedAccessibilityEvent = 7969 new SendViewStateChangedAccessibilityEvent(); 7970 } 7971 mSendViewStateChangedAccessibilityEvent.runOrPost(changeType); 7972 } 7973 7974 /** 7975 * Notifies that the accessibility state of this view changed. The change 7976 * is *not* local to this view and does represent structural changes such 7977 * as children and parent. For example, the view size changed. The 7978 * notification is at at most once every 7979 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 7980 * to avoid unnecessary load to the system. Also once a view has a pending 7981 * notification this method is a NOP until the notification has been sent. 7982 * 7983 * @hide 7984 */ 7985 public void notifySubtreeAccessibilityStateChangedIfNeeded() { 7986 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 7987 return; 7988 } 7989 if ((mPrivateFlags2 & PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED) == 0) { 7990 mPrivateFlags2 |= PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; 7991 if (mParent != null) { 7992 try { 7993 mParent.notifySubtreeAccessibilityStateChanged( 7994 this, this, AccessibilityEvent.CONTENT_CHANGE_TYPE_SUBTREE); 7995 } catch (AbstractMethodError e) { 7996 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 7997 " does not fully implement ViewParent", e); 7998 } 7999 } 8000 } 8001 } 8002 8003 /** 8004 * Reset the flag indicating the accessibility state of the subtree rooted 8005 * at this view changed. 8006 */ 8007 void resetSubtreeAccessibilityStateChanged() { 8008 mPrivateFlags2 &= ~PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; 8009 } 8010 8011 /** 8012 * Performs the specified accessibility action on the view. For 8013 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 8014 * <p> 8015 * If an {@link AccessibilityDelegate} has been specified via calling 8016 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 8017 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 8018 * is responsible for handling this call. 8019 * </p> 8020 * 8021 * @param action The action to perform. 8022 * @param arguments Optional action arguments. 8023 * @return Whether the action was performed. 8024 */ 8025 public boolean performAccessibilityAction(int action, Bundle arguments) { 8026 if (mAccessibilityDelegate != null) { 8027 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 8028 } else { 8029 return performAccessibilityActionInternal(action, arguments); 8030 } 8031 } 8032 8033 /** 8034 * @see #performAccessibilityAction(int, Bundle) 8035 * 8036 * Note: Called from the default {@link AccessibilityDelegate}. 8037 */ 8038 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 8039 switch (action) { 8040 case AccessibilityNodeInfo.ACTION_CLICK: { 8041 if (isClickable()) { 8042 performClick(); 8043 return true; 8044 } 8045 } break; 8046 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 8047 if (isLongClickable()) { 8048 performLongClick(); 8049 return true; 8050 } 8051 } break; 8052 case AccessibilityNodeInfo.ACTION_FOCUS: { 8053 if (!hasFocus()) { 8054 // Get out of touch mode since accessibility 8055 // wants to move focus around. 8056 getViewRootImpl().ensureTouchMode(false); 8057 return requestFocus(); 8058 } 8059 } break; 8060 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 8061 if (hasFocus()) { 8062 clearFocus(); 8063 return !isFocused(); 8064 } 8065 } break; 8066 case AccessibilityNodeInfo.ACTION_SELECT: { 8067 if (!isSelected()) { 8068 setSelected(true); 8069 return isSelected(); 8070 } 8071 } break; 8072 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 8073 if (isSelected()) { 8074 setSelected(false); 8075 return !isSelected(); 8076 } 8077 } break; 8078 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 8079 if (!isAccessibilityFocused()) { 8080 return requestAccessibilityFocus(); 8081 } 8082 } break; 8083 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 8084 if (isAccessibilityFocused()) { 8085 clearAccessibilityFocus(); 8086 return true; 8087 } 8088 } break; 8089 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 8090 if (arguments != null) { 8091 final int granularity = arguments.getInt( 8092 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 8093 final boolean extendSelection = arguments.getBoolean( 8094 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 8095 return traverseAtGranularity(granularity, true, extendSelection); 8096 } 8097 } break; 8098 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 8099 if (arguments != null) { 8100 final int granularity = arguments.getInt( 8101 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 8102 final boolean extendSelection = arguments.getBoolean( 8103 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 8104 return traverseAtGranularity(granularity, false, extendSelection); 8105 } 8106 } break; 8107 case AccessibilityNodeInfo.ACTION_SET_SELECTION: { 8108 CharSequence text = getIterableTextForAccessibility(); 8109 if (text == null) { 8110 return false; 8111 } 8112 final int start = (arguments != null) ? arguments.getInt( 8113 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, -1) : -1; 8114 final int end = (arguments != null) ? arguments.getInt( 8115 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, -1) : -1; 8116 // Only cursor position can be specified (selection length == 0) 8117 if ((getAccessibilitySelectionStart() != start 8118 || getAccessibilitySelectionEnd() != end) 8119 && (start == end)) { 8120 setAccessibilitySelection(start, end); 8121 notifyViewAccessibilityStateChangedIfNeeded( 8122 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 8123 return true; 8124 } 8125 } break; 8126 } 8127 return false; 8128 } 8129 8130 private boolean traverseAtGranularity(int granularity, boolean forward, 8131 boolean extendSelection) { 8132 CharSequence text = getIterableTextForAccessibility(); 8133 if (text == null || text.length() == 0) { 8134 return false; 8135 } 8136 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 8137 if (iterator == null) { 8138 return false; 8139 } 8140 int current = getAccessibilitySelectionEnd(); 8141 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 8142 current = forward ? 0 : text.length(); 8143 } 8144 final int[] range = forward ? iterator.following(current) : iterator.preceding(current); 8145 if (range == null) { 8146 return false; 8147 } 8148 final int segmentStart = range[0]; 8149 final int segmentEnd = range[1]; 8150 int selectionStart; 8151 int selectionEnd; 8152 if (extendSelection && isAccessibilitySelectionExtendable()) { 8153 selectionStart = getAccessibilitySelectionStart(); 8154 if (selectionStart == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 8155 selectionStart = forward ? segmentStart : segmentEnd; 8156 } 8157 selectionEnd = forward ? segmentEnd : segmentStart; 8158 } else { 8159 selectionStart = selectionEnd= forward ? segmentEnd : segmentStart; 8160 } 8161 setAccessibilitySelection(selectionStart, selectionEnd); 8162 final int action = forward ? AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY 8163 : AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY; 8164 sendViewTextTraversedAtGranularityEvent(action, granularity, segmentStart, segmentEnd); 8165 return true; 8166 } 8167 8168 /** 8169 * Gets the text reported for accessibility purposes. 8170 * 8171 * @return The accessibility text. 8172 * 8173 * @hide 8174 */ 8175 public CharSequence getIterableTextForAccessibility() { 8176 return getContentDescription(); 8177 } 8178 8179 /** 8180 * Gets whether accessibility selection can be extended. 8181 * 8182 * @return If selection is extensible. 8183 * 8184 * @hide 8185 */ 8186 public boolean isAccessibilitySelectionExtendable() { 8187 return false; 8188 } 8189 8190 /** 8191 * @hide 8192 */ 8193 public int getAccessibilitySelectionStart() { 8194 return mAccessibilityCursorPosition; 8195 } 8196 8197 /** 8198 * @hide 8199 */ 8200 public int getAccessibilitySelectionEnd() { 8201 return getAccessibilitySelectionStart(); 8202 } 8203 8204 /** 8205 * @hide 8206 */ 8207 public void setAccessibilitySelection(int start, int end) { 8208 if (start == end && end == mAccessibilityCursorPosition) { 8209 return; 8210 } 8211 if (start >= 0 && start == end && end <= getIterableTextForAccessibility().length()) { 8212 mAccessibilityCursorPosition = start; 8213 } else { 8214 mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 8215 } 8216 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED); 8217 } 8218 8219 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 8220 int fromIndex, int toIndex) { 8221 if (mParent == null) { 8222 return; 8223 } 8224 AccessibilityEvent event = AccessibilityEvent.obtain( 8225 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 8226 onInitializeAccessibilityEvent(event); 8227 onPopulateAccessibilityEvent(event); 8228 event.setFromIndex(fromIndex); 8229 event.setToIndex(toIndex); 8230 event.setAction(action); 8231 event.setMovementGranularity(granularity); 8232 mParent.requestSendAccessibilityEvent(this, event); 8233 } 8234 8235 /** 8236 * @hide 8237 */ 8238 public TextSegmentIterator getIteratorForGranularity(int granularity) { 8239 switch (granularity) { 8240 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 8241 CharSequence text = getIterableTextForAccessibility(); 8242 if (text != null && text.length() > 0) { 8243 CharacterTextSegmentIterator iterator = 8244 CharacterTextSegmentIterator.getInstance( 8245 mContext.getResources().getConfiguration().locale); 8246 iterator.initialize(text.toString()); 8247 return iterator; 8248 } 8249 } break; 8250 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 8251 CharSequence text = getIterableTextForAccessibility(); 8252 if (text != null && text.length() > 0) { 8253 WordTextSegmentIterator iterator = 8254 WordTextSegmentIterator.getInstance( 8255 mContext.getResources().getConfiguration().locale); 8256 iterator.initialize(text.toString()); 8257 return iterator; 8258 } 8259 } break; 8260 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 8261 CharSequence text = getIterableTextForAccessibility(); 8262 if (text != null && text.length() > 0) { 8263 ParagraphTextSegmentIterator iterator = 8264 ParagraphTextSegmentIterator.getInstance(); 8265 iterator.initialize(text.toString()); 8266 return iterator; 8267 } 8268 } break; 8269 } 8270 return null; 8271 } 8272 8273 /** 8274 * @hide 8275 */ 8276 public void dispatchStartTemporaryDetach() { 8277 onStartTemporaryDetach(); 8278 } 8279 8280 /** 8281 * This is called when a container is going to temporarily detach a child, with 8282 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 8283 * It will either be followed by {@link #onFinishTemporaryDetach()} or 8284 * {@link #onDetachedFromWindow()} when the container is done. 8285 */ 8286 public void onStartTemporaryDetach() { 8287 removeUnsetPressCallback(); 8288 mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT; 8289 } 8290 8291 /** 8292 * @hide 8293 */ 8294 public void dispatchFinishTemporaryDetach() { 8295 onFinishTemporaryDetach(); 8296 } 8297 8298 /** 8299 * Called after {@link #onStartTemporaryDetach} when the container is done 8300 * changing the view. 8301 */ 8302 public void onFinishTemporaryDetach() { 8303 } 8304 8305 /** 8306 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 8307 * for this view's window. Returns null if the view is not currently attached 8308 * to the window. Normally you will not need to use this directly, but 8309 * just use the standard high-level event callbacks like 8310 * {@link #onKeyDown(int, KeyEvent)}. 8311 */ 8312 public KeyEvent.DispatcherState getKeyDispatcherState() { 8313 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 8314 } 8315 8316 /** 8317 * Dispatch a key event before it is processed by any input method 8318 * associated with the view hierarchy. This can be used to intercept 8319 * key events in special situations before the IME consumes them; a 8320 * typical example would be handling the BACK key to update the application's 8321 * UI instead of allowing the IME to see it and close itself. 8322 * 8323 * @param event The key event to be dispatched. 8324 * @return True if the event was handled, false otherwise. 8325 */ 8326 public boolean dispatchKeyEventPreIme(KeyEvent event) { 8327 return onKeyPreIme(event.getKeyCode(), event); 8328 } 8329 8330 /** 8331 * Dispatch a key event to the next view on the focus path. This path runs 8332 * from the top of the view tree down to the currently focused view. If this 8333 * view has focus, it will dispatch to itself. Otherwise it will dispatch 8334 * the next node down the focus path. This method also fires any key 8335 * listeners. 8336 * 8337 * @param event The key event to be dispatched. 8338 * @return True if the event was handled, false otherwise. 8339 */ 8340 public boolean dispatchKeyEvent(KeyEvent event) { 8341 if (mInputEventConsistencyVerifier != null) { 8342 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 8343 } 8344 8345 // Give any attached key listener a first crack at the event. 8346 //noinspection SimplifiableIfStatement 8347 ListenerInfo li = mListenerInfo; 8348 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 8349 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 8350 return true; 8351 } 8352 8353 if (event.dispatch(this, mAttachInfo != null 8354 ? mAttachInfo.mKeyDispatchState : null, this)) { 8355 return true; 8356 } 8357 8358 if (mInputEventConsistencyVerifier != null) { 8359 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 8360 } 8361 return false; 8362 } 8363 8364 /** 8365 * Dispatches a key shortcut event. 8366 * 8367 * @param event The key event to be dispatched. 8368 * @return True if the event was handled by the view, false otherwise. 8369 */ 8370 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 8371 return onKeyShortcut(event.getKeyCode(), event); 8372 } 8373 8374 /** 8375 * Pass the touch screen motion event down to the target view, or this 8376 * view if it is the target. 8377 * 8378 * @param event The motion event to be dispatched. 8379 * @return True if the event was handled by the view, false otherwise. 8380 */ 8381 public boolean dispatchTouchEvent(MotionEvent event) { 8382 boolean result = false; 8383 8384 if (mInputEventConsistencyVerifier != null) { 8385 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 8386 } 8387 8388 final int actionMasked = event.getActionMasked(); 8389 if (actionMasked == MotionEvent.ACTION_DOWN) { 8390 // Defensive cleanup for new gesture 8391 stopNestedScroll(); 8392 } 8393 8394 if (onFilterTouchEventForSecurity(event)) { 8395 //noinspection SimplifiableIfStatement 8396 ListenerInfo li = mListenerInfo; 8397 if (li != null && li.mOnTouchListener != null 8398 && (mViewFlags & ENABLED_MASK) == ENABLED 8399 && li.mOnTouchListener.onTouch(this, event)) { 8400 result = true; 8401 } 8402 8403 if (!result && onTouchEvent(event)) { 8404 result = true; 8405 } 8406 } 8407 8408 if (!result && mInputEventConsistencyVerifier != null) { 8409 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 8410 } 8411 8412 // Clean up after nested scrolls if this is the end of a gesture; 8413 // also cancel it if we tried an ACTION_DOWN but we didn't want the rest 8414 // of the gesture. 8415 if (actionMasked == MotionEvent.ACTION_UP || 8416 actionMasked == MotionEvent.ACTION_CANCEL || 8417 (actionMasked == MotionEvent.ACTION_DOWN && !result)) { 8418 stopNestedScroll(); 8419 } 8420 8421 return result; 8422 } 8423 8424 /** 8425 * Filter the touch event to apply security policies. 8426 * 8427 * @param event The motion event to be filtered. 8428 * @return True if the event should be dispatched, false if the event should be dropped. 8429 * 8430 * @see #getFilterTouchesWhenObscured 8431 */ 8432 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 8433 //noinspection RedundantIfStatement 8434 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 8435 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 8436 // Window is obscured, drop this touch. 8437 return false; 8438 } 8439 return true; 8440 } 8441 8442 /** 8443 * Pass a trackball motion event down to the focused view. 8444 * 8445 * @param event The motion event to be dispatched. 8446 * @return True if the event was handled by the view, false otherwise. 8447 */ 8448 public boolean dispatchTrackballEvent(MotionEvent event) { 8449 if (mInputEventConsistencyVerifier != null) { 8450 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 8451 } 8452 8453 return onTrackballEvent(event); 8454 } 8455 8456 /** 8457 * Dispatch a generic motion event. 8458 * <p> 8459 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 8460 * are delivered to the view under the pointer. All other generic motion events are 8461 * delivered to the focused view. Hover events are handled specially and are delivered 8462 * to {@link #onHoverEvent(MotionEvent)}. 8463 * </p> 8464 * 8465 * @param event The motion event to be dispatched. 8466 * @return True if the event was handled by the view, false otherwise. 8467 */ 8468 public boolean dispatchGenericMotionEvent(MotionEvent event) { 8469 if (mInputEventConsistencyVerifier != null) { 8470 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 8471 } 8472 8473 final int source = event.getSource(); 8474 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 8475 final int action = event.getAction(); 8476 if (action == MotionEvent.ACTION_HOVER_ENTER 8477 || action == MotionEvent.ACTION_HOVER_MOVE 8478 || action == MotionEvent.ACTION_HOVER_EXIT) { 8479 if (dispatchHoverEvent(event)) { 8480 return true; 8481 } 8482 } else if (dispatchGenericPointerEvent(event)) { 8483 return true; 8484 } 8485 } else if (dispatchGenericFocusedEvent(event)) { 8486 return true; 8487 } 8488 8489 if (dispatchGenericMotionEventInternal(event)) { 8490 return true; 8491 } 8492 8493 if (mInputEventConsistencyVerifier != null) { 8494 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 8495 } 8496 return false; 8497 } 8498 8499 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 8500 //noinspection SimplifiableIfStatement 8501 ListenerInfo li = mListenerInfo; 8502 if (li != null && li.mOnGenericMotionListener != null 8503 && (mViewFlags & ENABLED_MASK) == ENABLED 8504 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 8505 return true; 8506 } 8507 8508 if (onGenericMotionEvent(event)) { 8509 return true; 8510 } 8511 8512 if (mInputEventConsistencyVerifier != null) { 8513 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 8514 } 8515 return false; 8516 } 8517 8518 /** 8519 * Dispatch a hover event. 8520 * <p> 8521 * Do not call this method directly. 8522 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 8523 * </p> 8524 * 8525 * @param event The motion event to be dispatched. 8526 * @return True if the event was handled by the view, false otherwise. 8527 */ 8528 protected boolean dispatchHoverEvent(MotionEvent event) { 8529 ListenerInfo li = mListenerInfo; 8530 //noinspection SimplifiableIfStatement 8531 if (li != null && li.mOnHoverListener != null 8532 && (mViewFlags & ENABLED_MASK) == ENABLED 8533 && li.mOnHoverListener.onHover(this, event)) { 8534 return true; 8535 } 8536 8537 return onHoverEvent(event); 8538 } 8539 8540 /** 8541 * Returns true if the view has a child to which it has recently sent 8542 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 8543 * it does not have a hovered child, then it must be the innermost hovered view. 8544 * @hide 8545 */ 8546 protected boolean hasHoveredChild() { 8547 return false; 8548 } 8549 8550 /** 8551 * Dispatch a generic motion event to the view under the first pointer. 8552 * <p> 8553 * Do not call this method directly. 8554 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 8555 * </p> 8556 * 8557 * @param event The motion event to be dispatched. 8558 * @return True if the event was handled by the view, false otherwise. 8559 */ 8560 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 8561 return false; 8562 } 8563 8564 /** 8565 * Dispatch a generic motion event to the currently focused view. 8566 * <p> 8567 * Do not call this method directly. 8568 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 8569 * </p> 8570 * 8571 * @param event The motion event to be dispatched. 8572 * @return True if the event was handled by the view, false otherwise. 8573 */ 8574 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 8575 return false; 8576 } 8577 8578 /** 8579 * Dispatch a pointer event. 8580 * <p> 8581 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 8582 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 8583 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 8584 * and should not be expected to handle other pointing device features. 8585 * </p> 8586 * 8587 * @param event The motion event to be dispatched. 8588 * @return True if the event was handled by the view, false otherwise. 8589 * @hide 8590 */ 8591 public final boolean dispatchPointerEvent(MotionEvent event) { 8592 if (event.isTouchEvent()) { 8593 return dispatchTouchEvent(event); 8594 } else { 8595 return dispatchGenericMotionEvent(event); 8596 } 8597 } 8598 8599 /** 8600 * Called when the window containing this view gains or loses window focus. 8601 * ViewGroups should override to route to their children. 8602 * 8603 * @param hasFocus True if the window containing this view now has focus, 8604 * false otherwise. 8605 */ 8606 public void dispatchWindowFocusChanged(boolean hasFocus) { 8607 onWindowFocusChanged(hasFocus); 8608 } 8609 8610 /** 8611 * Called when the window containing this view gains or loses focus. Note 8612 * that this is separate from view focus: to receive key events, both 8613 * your view and its window must have focus. If a window is displayed 8614 * on top of yours that takes input focus, then your own window will lose 8615 * focus but the view focus will remain unchanged. 8616 * 8617 * @param hasWindowFocus True if the window containing this view now has 8618 * focus, false otherwise. 8619 */ 8620 public void onWindowFocusChanged(boolean hasWindowFocus) { 8621 InputMethodManager imm = InputMethodManager.peekInstance(); 8622 if (!hasWindowFocus) { 8623 if (isPressed()) { 8624 setPressed(false); 8625 } 8626 if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 8627 imm.focusOut(this); 8628 } 8629 removeLongPressCallback(); 8630 removeTapCallback(); 8631 onFocusLost(); 8632 } else if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 8633 imm.focusIn(this); 8634 } 8635 refreshDrawableState(); 8636 } 8637 8638 /** 8639 * Returns true if this view is in a window that currently has window focus. 8640 * Note that this is not the same as the view itself having focus. 8641 * 8642 * @return True if this view is in a window that currently has window focus. 8643 */ 8644 public boolean hasWindowFocus() { 8645 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 8646 } 8647 8648 /** 8649 * Dispatch a view visibility change down the view hierarchy. 8650 * ViewGroups should override to route to their children. 8651 * @param changedView The view whose visibility changed. Could be 'this' or 8652 * an ancestor view. 8653 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 8654 * {@link #INVISIBLE} or {@link #GONE}. 8655 */ 8656 protected void dispatchVisibilityChanged(@NonNull View changedView, 8657 @Visibility int visibility) { 8658 onVisibilityChanged(changedView, visibility); 8659 } 8660 8661 /** 8662 * Called when the visibility of the view or an ancestor of the view is changed. 8663 * @param changedView The view whose visibility changed. Could be 'this' or 8664 * an ancestor view. 8665 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 8666 * {@link #INVISIBLE} or {@link #GONE}. 8667 */ 8668 protected void onVisibilityChanged(@NonNull View changedView, @Visibility int visibility) { 8669 if (visibility == VISIBLE) { 8670 if (mAttachInfo != null) { 8671 initialAwakenScrollBars(); 8672 } else { 8673 mPrivateFlags |= PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 8674 } 8675 } 8676 } 8677 8678 /** 8679 * Dispatch a hint about whether this view is displayed. For instance, when 8680 * a View moves out of the screen, it might receives a display hint indicating 8681 * the view is not displayed. Applications should not <em>rely</em> on this hint 8682 * as there is no guarantee that they will receive one. 8683 * 8684 * @param hint A hint about whether or not this view is displayed: 8685 * {@link #VISIBLE} or {@link #INVISIBLE}. 8686 */ 8687 public void dispatchDisplayHint(@Visibility int hint) { 8688 onDisplayHint(hint); 8689 } 8690 8691 /** 8692 * Gives this view a hint about whether is displayed or not. For instance, when 8693 * a View moves out of the screen, it might receives a display hint indicating 8694 * the view is not displayed. Applications should not <em>rely</em> on this hint 8695 * as there is no guarantee that they will receive one. 8696 * 8697 * @param hint A hint about whether or not this view is displayed: 8698 * {@link #VISIBLE} or {@link #INVISIBLE}. 8699 */ 8700 protected void onDisplayHint(@Visibility int hint) { 8701 } 8702 8703 /** 8704 * Dispatch a window visibility change down the view hierarchy. 8705 * ViewGroups should override to route to their children. 8706 * 8707 * @param visibility The new visibility of the window. 8708 * 8709 * @see #onWindowVisibilityChanged(int) 8710 */ 8711 public void dispatchWindowVisibilityChanged(@Visibility int visibility) { 8712 onWindowVisibilityChanged(visibility); 8713 } 8714 8715 /** 8716 * Called when the window containing has change its visibility 8717 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 8718 * that this tells you whether or not your window is being made visible 8719 * to the window manager; this does <em>not</em> tell you whether or not 8720 * your window is obscured by other windows on the screen, even if it 8721 * is itself visible. 8722 * 8723 * @param visibility The new visibility of the window. 8724 */ 8725 protected void onWindowVisibilityChanged(@Visibility int visibility) { 8726 if (visibility == VISIBLE) { 8727 initialAwakenScrollBars(); 8728 } 8729 } 8730 8731 /** 8732 * Returns the current visibility of the window this view is attached to 8733 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 8734 * 8735 * @return Returns the current visibility of the view's window. 8736 */ 8737 @Visibility 8738 public int getWindowVisibility() { 8739 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 8740 } 8741 8742 /** 8743 * Retrieve the overall visible display size in which the window this view is 8744 * attached to has been positioned in. This takes into account screen 8745 * decorations above the window, for both cases where the window itself 8746 * is being position inside of them or the window is being placed under 8747 * then and covered insets are used for the window to position its content 8748 * inside. In effect, this tells you the available area where content can 8749 * be placed and remain visible to users. 8750 * 8751 * <p>This function requires an IPC back to the window manager to retrieve 8752 * the requested information, so should not be used in performance critical 8753 * code like drawing. 8754 * 8755 * @param outRect Filled in with the visible display frame. If the view 8756 * is not attached to a window, this is simply the raw display size. 8757 */ 8758 public void getWindowVisibleDisplayFrame(Rect outRect) { 8759 if (mAttachInfo != null) { 8760 try { 8761 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 8762 } catch (RemoteException e) { 8763 return; 8764 } 8765 // XXX This is really broken, and probably all needs to be done 8766 // in the window manager, and we need to know more about whether 8767 // we want the area behind or in front of the IME. 8768 final Rect insets = mAttachInfo.mVisibleInsets; 8769 outRect.left += insets.left; 8770 outRect.top += insets.top; 8771 outRect.right -= insets.right; 8772 outRect.bottom -= insets.bottom; 8773 return; 8774 } 8775 // The view is not attached to a display so we don't have a context. 8776 // Make a best guess about the display size. 8777 Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY); 8778 d.getRectSize(outRect); 8779 } 8780 8781 /** 8782 * Dispatch a notification about a resource configuration change down 8783 * the view hierarchy. 8784 * ViewGroups should override to route to their children. 8785 * 8786 * @param newConfig The new resource configuration. 8787 * 8788 * @see #onConfigurationChanged(android.content.res.Configuration) 8789 */ 8790 public void dispatchConfigurationChanged(Configuration newConfig) { 8791 onConfigurationChanged(newConfig); 8792 } 8793 8794 /** 8795 * Called when the current configuration of the resources being used 8796 * by the application have changed. You can use this to decide when 8797 * to reload resources that can changed based on orientation and other 8798 * configuration characterstics. You only need to use this if you are 8799 * not relying on the normal {@link android.app.Activity} mechanism of 8800 * recreating the activity instance upon a configuration change. 8801 * 8802 * @param newConfig The new resource configuration. 8803 */ 8804 protected void onConfigurationChanged(Configuration newConfig) { 8805 } 8806 8807 /** 8808 * Private function to aggregate all per-view attributes in to the view 8809 * root. 8810 */ 8811 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 8812 performCollectViewAttributes(attachInfo, visibility); 8813 } 8814 8815 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 8816 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 8817 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 8818 attachInfo.mKeepScreenOn = true; 8819 } 8820 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 8821 ListenerInfo li = mListenerInfo; 8822 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 8823 attachInfo.mHasSystemUiListeners = true; 8824 } 8825 } 8826 } 8827 8828 void needGlobalAttributesUpdate(boolean force) { 8829 final AttachInfo ai = mAttachInfo; 8830 if (ai != null && !ai.mRecomputeGlobalAttributes) { 8831 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 8832 || ai.mHasSystemUiListeners) { 8833 ai.mRecomputeGlobalAttributes = true; 8834 } 8835 } 8836 } 8837 8838 /** 8839 * Returns whether the device is currently in touch mode. Touch mode is entered 8840 * once the user begins interacting with the device by touch, and affects various 8841 * things like whether focus is always visible to the user. 8842 * 8843 * @return Whether the device is in touch mode. 8844 */ 8845 @ViewDebug.ExportedProperty 8846 public boolean isInTouchMode() { 8847 if (mAttachInfo != null) { 8848 return mAttachInfo.mInTouchMode; 8849 } else { 8850 return ViewRootImpl.isInTouchMode(); 8851 } 8852 } 8853 8854 /** 8855 * Returns the context the view is running in, through which it can 8856 * access the current theme, resources, etc. 8857 * 8858 * @return The view's Context. 8859 */ 8860 @ViewDebug.CapturedViewProperty 8861 public final Context getContext() { 8862 return mContext; 8863 } 8864 8865 /** 8866 * Handle a key event before it is processed by any input method 8867 * associated with the view hierarchy. This can be used to intercept 8868 * key events in special situations before the IME consumes them; a 8869 * typical example would be handling the BACK key to update the application's 8870 * UI instead of allowing the IME to see it and close itself. 8871 * 8872 * @param keyCode The value in event.getKeyCode(). 8873 * @param event Description of the key event. 8874 * @return If you handled the event, return true. If you want to allow the 8875 * event to be handled by the next receiver, return false. 8876 */ 8877 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 8878 return false; 8879 } 8880 8881 /** 8882 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 8883 * KeyEvent.Callback.onKeyDown()}: perform press of the view 8884 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 8885 * is released, if the view is enabled and clickable. 8886 * 8887 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8888 * although some may elect to do so in some situations. Do not rely on this to 8889 * catch software key presses. 8890 * 8891 * @param keyCode A key code that represents the button pressed, from 8892 * {@link android.view.KeyEvent}. 8893 * @param event The KeyEvent object that defines the button action. 8894 */ 8895 public boolean onKeyDown(int keyCode, KeyEvent event) { 8896 boolean result = false; 8897 8898 if (KeyEvent.isConfirmKey(keyCode)) { 8899 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 8900 return true; 8901 } 8902 // Long clickable items don't necessarily have to be clickable 8903 if (((mViewFlags & CLICKABLE) == CLICKABLE || 8904 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 8905 (event.getRepeatCount() == 0)) { 8906 setPressed(true); 8907 checkForLongClick(0); 8908 return true; 8909 } 8910 } 8911 return result; 8912 } 8913 8914 /** 8915 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 8916 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 8917 * the event). 8918 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8919 * although some may elect to do so in some situations. Do not rely on this to 8920 * catch software key presses. 8921 */ 8922 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 8923 return false; 8924 } 8925 8926 /** 8927 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 8928 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 8929 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 8930 * {@link KeyEvent#KEYCODE_ENTER} is released. 8931 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8932 * although some may elect to do so in some situations. Do not rely on this to 8933 * catch software key presses. 8934 * 8935 * @param keyCode A key code that represents the button pressed, from 8936 * {@link android.view.KeyEvent}. 8937 * @param event The KeyEvent object that defines the button action. 8938 */ 8939 public boolean onKeyUp(int keyCode, KeyEvent event) { 8940 if (KeyEvent.isConfirmKey(keyCode)) { 8941 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 8942 return true; 8943 } 8944 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 8945 setPressed(false); 8946 8947 if (!mHasPerformedLongPress) { 8948 // This is a tap, so remove the longpress check 8949 removeLongPressCallback(); 8950 return performClick(); 8951 } 8952 } 8953 } 8954 return false; 8955 } 8956 8957 /** 8958 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 8959 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 8960 * the event). 8961 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8962 * although some may elect to do so in some situations. Do not rely on this to 8963 * catch software key presses. 8964 * 8965 * @param keyCode A key code that represents the button pressed, from 8966 * {@link android.view.KeyEvent}. 8967 * @param repeatCount The number of times the action was made. 8968 * @param event The KeyEvent object that defines the button action. 8969 */ 8970 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 8971 return false; 8972 } 8973 8974 /** 8975 * Called on the focused view when a key shortcut event is not handled. 8976 * Override this method to implement local key shortcuts for the View. 8977 * Key shortcuts can also be implemented by setting the 8978 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 8979 * 8980 * @param keyCode The value in event.getKeyCode(). 8981 * @param event Description of the key event. 8982 * @return If you handled the event, return true. If you want to allow the 8983 * event to be handled by the next receiver, return false. 8984 */ 8985 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 8986 return false; 8987 } 8988 8989 /** 8990 * Check whether the called view is a text editor, in which case it 8991 * would make sense to automatically display a soft input window for 8992 * it. Subclasses should override this if they implement 8993 * {@link #onCreateInputConnection(EditorInfo)} to return true if 8994 * a call on that method would return a non-null InputConnection, and 8995 * they are really a first-class editor that the user would normally 8996 * start typing on when the go into a window containing your view. 8997 * 8998 * <p>The default implementation always returns false. This does 8999 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 9000 * will not be called or the user can not otherwise perform edits on your 9001 * view; it is just a hint to the system that this is not the primary 9002 * purpose of this view. 9003 * 9004 * @return Returns true if this view is a text editor, else false. 9005 */ 9006 public boolean onCheckIsTextEditor() { 9007 return false; 9008 } 9009 9010 /** 9011 * Create a new InputConnection for an InputMethod to interact 9012 * with the view. The default implementation returns null, since it doesn't 9013 * support input methods. You can override this to implement such support. 9014 * This is only needed for views that take focus and text input. 9015 * 9016 * <p>When implementing this, you probably also want to implement 9017 * {@link #onCheckIsTextEditor()} to indicate you will return a 9018 * non-null InputConnection.</p> 9019 * 9020 * <p>Also, take good care to fill in the {@link android.view.inputmethod.EditorInfo} 9021 * object correctly and in its entirety, so that the connected IME can rely 9022 * on its values. For example, {@link android.view.inputmethod.EditorInfo#initialSelStart} 9023 * and {@link android.view.inputmethod.EditorInfo#initialSelEnd} members 9024 * must be filled in with the correct cursor position for IMEs to work correctly 9025 * with your application.</p> 9026 * 9027 * @param outAttrs Fill in with attribute information about the connection. 9028 */ 9029 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 9030 return null; 9031 } 9032 9033 /** 9034 * Called by the {@link android.view.inputmethod.InputMethodManager} 9035 * when a view who is not the current 9036 * input connection target is trying to make a call on the manager. The 9037 * default implementation returns false; you can override this to return 9038 * true for certain views if you are performing InputConnection proxying 9039 * to them. 9040 * @param view The View that is making the InputMethodManager call. 9041 * @return Return true to allow the call, false to reject. 9042 */ 9043 public boolean checkInputConnectionProxy(View view) { 9044 return false; 9045 } 9046 9047 /** 9048 * Show the context menu for this view. It is not safe to hold on to the 9049 * menu after returning from this method. 9050 * 9051 * You should normally not overload this method. Overload 9052 * {@link #onCreateContextMenu(ContextMenu)} or define an 9053 * {@link OnCreateContextMenuListener} to add items to the context menu. 9054 * 9055 * @param menu The context menu to populate 9056 */ 9057 public void createContextMenu(ContextMenu menu) { 9058 ContextMenuInfo menuInfo = getContextMenuInfo(); 9059 9060 // Sets the current menu info so all items added to menu will have 9061 // my extra info set. 9062 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 9063 9064 onCreateContextMenu(menu); 9065 ListenerInfo li = mListenerInfo; 9066 if (li != null && li.mOnCreateContextMenuListener != null) { 9067 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 9068 } 9069 9070 // Clear the extra information so subsequent items that aren't mine don't 9071 // have my extra info. 9072 ((MenuBuilder)menu).setCurrentMenuInfo(null); 9073 9074 if (mParent != null) { 9075 mParent.createContextMenu(menu); 9076 } 9077 } 9078 9079 /** 9080 * Views should implement this if they have extra information to associate 9081 * with the context menu. The return result is supplied as a parameter to 9082 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 9083 * callback. 9084 * 9085 * @return Extra information about the item for which the context menu 9086 * should be shown. This information will vary across different 9087 * subclasses of View. 9088 */ 9089 protected ContextMenuInfo getContextMenuInfo() { 9090 return null; 9091 } 9092 9093 /** 9094 * Views should implement this if the view itself is going to add items to 9095 * the context menu. 9096 * 9097 * @param menu the context menu to populate 9098 */ 9099 protected void onCreateContextMenu(ContextMenu menu) { 9100 } 9101 9102 /** 9103 * Implement this method to handle trackball motion events. The 9104 * <em>relative</em> movement of the trackball since the last event 9105 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 9106 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 9107 * that a movement of 1 corresponds to the user pressing one DPAD key (so 9108 * they will often be fractional values, representing the more fine-grained 9109 * movement information available from a trackball). 9110 * 9111 * @param event The motion event. 9112 * @return True if the event was handled, false otherwise. 9113 */ 9114 public boolean onTrackballEvent(MotionEvent event) { 9115 return false; 9116 } 9117 9118 /** 9119 * Implement this method to handle generic motion events. 9120 * <p> 9121 * Generic motion events describe joystick movements, mouse hovers, track pad 9122 * touches, scroll wheel movements and other input events. The 9123 * {@link MotionEvent#getSource() source} of the motion event specifies 9124 * the class of input that was received. Implementations of this method 9125 * must examine the bits in the source before processing the event. 9126 * The following code example shows how this is done. 9127 * </p><p> 9128 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 9129 * are delivered to the view under the pointer. All other generic motion events are 9130 * delivered to the focused view. 9131 * </p> 9132 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 9133 * if (event.isFromSource(InputDevice.SOURCE_CLASS_JOYSTICK)) { 9134 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 9135 * // process the joystick movement... 9136 * return true; 9137 * } 9138 * } 9139 * if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) { 9140 * switch (event.getAction()) { 9141 * case MotionEvent.ACTION_HOVER_MOVE: 9142 * // process the mouse hover movement... 9143 * return true; 9144 * case MotionEvent.ACTION_SCROLL: 9145 * // process the scroll wheel movement... 9146 * return true; 9147 * } 9148 * } 9149 * return super.onGenericMotionEvent(event); 9150 * }</pre> 9151 * 9152 * @param event The generic motion event being processed. 9153 * @return True if the event was handled, false otherwise. 9154 */ 9155 public boolean onGenericMotionEvent(MotionEvent event) { 9156 return false; 9157 } 9158 9159 /** 9160 * Implement this method to handle hover events. 9161 * <p> 9162 * This method is called whenever a pointer is hovering into, over, or out of the 9163 * bounds of a view and the view is not currently being touched. 9164 * Hover events are represented as pointer events with action 9165 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 9166 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 9167 * </p> 9168 * <ul> 9169 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 9170 * when the pointer enters the bounds of the view.</li> 9171 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 9172 * when the pointer has already entered the bounds of the view and has moved.</li> 9173 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 9174 * when the pointer has exited the bounds of the view or when the pointer is 9175 * about to go down due to a button click, tap, or similar user action that 9176 * causes the view to be touched.</li> 9177 * </ul> 9178 * <p> 9179 * The view should implement this method to return true to indicate that it is 9180 * handling the hover event, such as by changing its drawable state. 9181 * </p><p> 9182 * The default implementation calls {@link #setHovered} to update the hovered state 9183 * of the view when a hover enter or hover exit event is received, if the view 9184 * is enabled and is clickable. The default implementation also sends hover 9185 * accessibility events. 9186 * </p> 9187 * 9188 * @param event The motion event that describes the hover. 9189 * @return True if the view handled the hover event. 9190 * 9191 * @see #isHovered 9192 * @see #setHovered 9193 * @see #onHoverChanged 9194 */ 9195 public boolean onHoverEvent(MotionEvent event) { 9196 // The root view may receive hover (or touch) events that are outside the bounds of 9197 // the window. This code ensures that we only send accessibility events for 9198 // hovers that are actually within the bounds of the root view. 9199 final int action = event.getActionMasked(); 9200 if (!mSendingHoverAccessibilityEvents) { 9201 if ((action == MotionEvent.ACTION_HOVER_ENTER 9202 || action == MotionEvent.ACTION_HOVER_MOVE) 9203 && !hasHoveredChild() 9204 && pointInView(event.getX(), event.getY())) { 9205 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 9206 mSendingHoverAccessibilityEvents = true; 9207 } 9208 } else { 9209 if (action == MotionEvent.ACTION_HOVER_EXIT 9210 || (action == MotionEvent.ACTION_MOVE 9211 && !pointInView(event.getX(), event.getY()))) { 9212 mSendingHoverAccessibilityEvents = false; 9213 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 9214 } 9215 } 9216 9217 if (isHoverable()) { 9218 switch (action) { 9219 case MotionEvent.ACTION_HOVER_ENTER: 9220 setHovered(true); 9221 break; 9222 case MotionEvent.ACTION_HOVER_EXIT: 9223 setHovered(false); 9224 break; 9225 } 9226 9227 // Dispatch the event to onGenericMotionEvent before returning true. 9228 // This is to provide compatibility with existing applications that 9229 // handled HOVER_MOVE events in onGenericMotionEvent and that would 9230 // break because of the new default handling for hoverable views 9231 // in onHoverEvent. 9232 // Note that onGenericMotionEvent will be called by default when 9233 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 9234 dispatchGenericMotionEventInternal(event); 9235 // The event was already handled by calling setHovered(), so always 9236 // return true. 9237 return true; 9238 } 9239 9240 return false; 9241 } 9242 9243 /** 9244 * Returns true if the view should handle {@link #onHoverEvent} 9245 * by calling {@link #setHovered} to change its hovered state. 9246 * 9247 * @return True if the view is hoverable. 9248 */ 9249 private boolean isHoverable() { 9250 final int viewFlags = mViewFlags; 9251 if ((viewFlags & ENABLED_MASK) == DISABLED) { 9252 return false; 9253 } 9254 9255 return (viewFlags & CLICKABLE) == CLICKABLE 9256 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 9257 } 9258 9259 /** 9260 * Returns true if the view is currently hovered. 9261 * 9262 * @return True if the view is currently hovered. 9263 * 9264 * @see #setHovered 9265 * @see #onHoverChanged 9266 */ 9267 @ViewDebug.ExportedProperty 9268 public boolean isHovered() { 9269 return (mPrivateFlags & PFLAG_HOVERED) != 0; 9270 } 9271 9272 /** 9273 * Sets whether the view is currently hovered. 9274 * <p> 9275 * Calling this method also changes the drawable state of the view. This 9276 * enables the view to react to hover by using different drawable resources 9277 * to change its appearance. 9278 * </p><p> 9279 * The {@link #onHoverChanged} method is called when the hovered state changes. 9280 * </p> 9281 * 9282 * @param hovered True if the view is hovered. 9283 * 9284 * @see #isHovered 9285 * @see #onHoverChanged 9286 */ 9287 public void setHovered(boolean hovered) { 9288 if (hovered) { 9289 if ((mPrivateFlags & PFLAG_HOVERED) == 0) { 9290 mPrivateFlags |= PFLAG_HOVERED; 9291 refreshDrawableState(); 9292 onHoverChanged(true); 9293 } 9294 } else { 9295 if ((mPrivateFlags & PFLAG_HOVERED) != 0) { 9296 mPrivateFlags &= ~PFLAG_HOVERED; 9297 refreshDrawableState(); 9298 onHoverChanged(false); 9299 } 9300 } 9301 } 9302 9303 /** 9304 * Implement this method to handle hover state changes. 9305 * <p> 9306 * This method is called whenever the hover state changes as a result of a 9307 * call to {@link #setHovered}. 9308 * </p> 9309 * 9310 * @param hovered The current hover state, as returned by {@link #isHovered}. 9311 * 9312 * @see #isHovered 9313 * @see #setHovered 9314 */ 9315 public void onHoverChanged(boolean hovered) { 9316 } 9317 9318 /** 9319 * Implement this method to handle touch screen motion events. 9320 * <p> 9321 * If this method is used to detect click actions, it is recommended that 9322 * the actions be performed by implementing and calling 9323 * {@link #performClick()}. This will ensure consistent system behavior, 9324 * including: 9325 * <ul> 9326 * <li>obeying click sound preferences 9327 * <li>dispatching OnClickListener calls 9328 * <li>handling {@link AccessibilityNodeInfo#ACTION_CLICK ACTION_CLICK} when 9329 * accessibility features are enabled 9330 * </ul> 9331 * 9332 * @param event The motion event. 9333 * @return True if the event was handled, false otherwise. 9334 */ 9335 public boolean onTouchEvent(MotionEvent event) { 9336 final float x = event.getX(); 9337 final float y = event.getY(); 9338 final int viewFlags = mViewFlags; 9339 9340 if ((viewFlags & ENABLED_MASK) == DISABLED) { 9341 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) { 9342 setPressed(false); 9343 } 9344 // A disabled view that is clickable still consumes the touch 9345 // events, it just doesn't respond to them. 9346 return (((viewFlags & CLICKABLE) == CLICKABLE || 9347 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 9348 } 9349 9350 if (mTouchDelegate != null) { 9351 if (mTouchDelegate.onTouchEvent(event)) { 9352 return true; 9353 } 9354 } 9355 9356 if (((viewFlags & CLICKABLE) == CLICKABLE || 9357 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 9358 switch (event.getAction()) { 9359 case MotionEvent.ACTION_UP: 9360 boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0; 9361 if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) { 9362 // take focus if we don't have it already and we should in 9363 // touch mode. 9364 boolean focusTaken = false; 9365 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 9366 focusTaken = requestFocus(); 9367 } 9368 9369 if (prepressed) { 9370 // The button is being released before we actually 9371 // showed it as pressed. Make it show the pressed 9372 // state now (before scheduling the click) to ensure 9373 // the user sees it. 9374 setPressed(true, x, y); 9375 } 9376 9377 if (!mHasPerformedLongPress) { 9378 // This is a tap, so remove the longpress check 9379 removeLongPressCallback(); 9380 9381 // Only perform take click actions if we were in the pressed state 9382 if (!focusTaken) { 9383 // Use a Runnable and post this rather than calling 9384 // performClick directly. This lets other visual state 9385 // of the view update before click actions start. 9386 if (mPerformClick == null) { 9387 mPerformClick = new PerformClick(); 9388 } 9389 if (!post(mPerformClick)) { 9390 performClick(); 9391 } 9392 } 9393 } 9394 9395 if (mUnsetPressedState == null) { 9396 mUnsetPressedState = new UnsetPressedState(); 9397 } 9398 9399 if (prepressed) { 9400 postDelayed(mUnsetPressedState, 9401 ViewConfiguration.getPressedStateDuration()); 9402 } else if (!post(mUnsetPressedState)) { 9403 // If the post failed, unpress right now 9404 mUnsetPressedState.run(); 9405 } 9406 9407 removeTapCallback(); 9408 } 9409 break; 9410 9411 case MotionEvent.ACTION_DOWN: 9412 mHasPerformedLongPress = false; 9413 9414 if (performButtonActionOnTouchDown(event)) { 9415 break; 9416 } 9417 9418 // Walk up the hierarchy to determine if we're inside a scrolling container. 9419 boolean isInScrollingContainer = isInScrollingContainer(); 9420 9421 // For views inside a scrolling container, delay the pressed feedback for 9422 // a short period in case this is a scroll. 9423 if (isInScrollingContainer) { 9424 mPrivateFlags |= PFLAG_PREPRESSED; 9425 if (mPendingCheckForTap == null) { 9426 mPendingCheckForTap = new CheckForTap(); 9427 } 9428 mPendingCheckForTap.x = event.getX(); 9429 mPendingCheckForTap.y = event.getY(); 9430 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 9431 } else { 9432 // Not inside a scrolling container, so show the feedback right away 9433 setPressed(true, x, y); 9434 checkForLongClick(0); 9435 } 9436 break; 9437 9438 case MotionEvent.ACTION_CANCEL: 9439 setPressed(false); 9440 removeTapCallback(); 9441 removeLongPressCallback(); 9442 break; 9443 9444 case MotionEvent.ACTION_MOVE: 9445 drawableHotspotChanged(x, y); 9446 9447 // Be lenient about moving outside of buttons 9448 if (!pointInView(x, y, mTouchSlop)) { 9449 // Outside button 9450 removeTapCallback(); 9451 if ((mPrivateFlags & PFLAG_PRESSED) != 0) { 9452 // Remove any future long press/tap checks 9453 removeLongPressCallback(); 9454 9455 setPressed(false); 9456 } 9457 } 9458 break; 9459 } 9460 9461 return true; 9462 } 9463 9464 return false; 9465 } 9466 9467 /** 9468 * @hide 9469 */ 9470 public boolean isInScrollingContainer() { 9471 ViewParent p = getParent(); 9472 while (p != null && p instanceof ViewGroup) { 9473 if (((ViewGroup) p).shouldDelayChildPressedState()) { 9474 return true; 9475 } 9476 p = p.getParent(); 9477 } 9478 return false; 9479 } 9480 9481 /** 9482 * Remove the longpress detection timer. 9483 */ 9484 private void removeLongPressCallback() { 9485 if (mPendingCheckForLongPress != null) { 9486 removeCallbacks(mPendingCheckForLongPress); 9487 } 9488 } 9489 9490 /** 9491 * Remove the pending click action 9492 */ 9493 private void removePerformClickCallback() { 9494 if (mPerformClick != null) { 9495 removeCallbacks(mPerformClick); 9496 } 9497 } 9498 9499 /** 9500 * Remove the prepress detection timer. 9501 */ 9502 private void removeUnsetPressCallback() { 9503 if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) { 9504 setPressed(false); 9505 removeCallbacks(mUnsetPressedState); 9506 } 9507 } 9508 9509 /** 9510 * Remove the tap detection timer. 9511 */ 9512 private void removeTapCallback() { 9513 if (mPendingCheckForTap != null) { 9514 mPrivateFlags &= ~PFLAG_PREPRESSED; 9515 removeCallbacks(mPendingCheckForTap); 9516 } 9517 } 9518 9519 /** 9520 * Cancels a pending long press. Your subclass can use this if you 9521 * want the context menu to come up if the user presses and holds 9522 * at the same place, but you don't want it to come up if they press 9523 * and then move around enough to cause scrolling. 9524 */ 9525 public void cancelLongPress() { 9526 removeLongPressCallback(); 9527 9528 /* 9529 * The prepressed state handled by the tap callback is a display 9530 * construct, but the tap callback will post a long press callback 9531 * less its own timeout. Remove it here. 9532 */ 9533 removeTapCallback(); 9534 } 9535 9536 /** 9537 * Remove the pending callback for sending a 9538 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 9539 */ 9540 private void removeSendViewScrolledAccessibilityEventCallback() { 9541 if (mSendViewScrolledAccessibilityEvent != null) { 9542 removeCallbacks(mSendViewScrolledAccessibilityEvent); 9543 mSendViewScrolledAccessibilityEvent.mIsPending = false; 9544 } 9545 } 9546 9547 /** 9548 * Sets the TouchDelegate for this View. 9549 */ 9550 public void setTouchDelegate(TouchDelegate delegate) { 9551 mTouchDelegate = delegate; 9552 } 9553 9554 /** 9555 * Gets the TouchDelegate for this View. 9556 */ 9557 public TouchDelegate getTouchDelegate() { 9558 return mTouchDelegate; 9559 } 9560 9561 /** 9562 * Request unbuffered dispatch of the given stream of MotionEvents to this View. 9563 * 9564 * Until this View receives a corresponding {@link MotionEvent#ACTION_UP}, ask that the input 9565 * system not batch {@link MotionEvent}s but instead deliver them as soon as they're 9566 * available. This method should only be called for touch events. 9567 * 9568 * <p class="note">This api is not intended for most applications. Buffered dispatch 9569 * provides many of benefits, and just requesting unbuffered dispatch on most MotionEvent 9570 * streams will not improve your input latency. Side effects include: increased latency, 9571 * jittery scrolls and inability to take advantage of system resampling. Talk to your input 9572 * professional to see if {@link #requestUnbufferedDispatch(MotionEvent)} is right for 9573 * you.</p> 9574 */ 9575 public final void requestUnbufferedDispatch(MotionEvent event) { 9576 final int action = event.getAction(); 9577 if (mAttachInfo == null 9578 || action != MotionEvent.ACTION_DOWN && action != MotionEvent.ACTION_MOVE 9579 || !event.isTouchEvent()) { 9580 return; 9581 } 9582 mAttachInfo.mUnbufferedDispatchRequested = true; 9583 } 9584 9585 /** 9586 * Set flags controlling behavior of this view. 9587 * 9588 * @param flags Constant indicating the value which should be set 9589 * @param mask Constant indicating the bit range that should be changed 9590 */ 9591 void setFlags(int flags, int mask) { 9592 final boolean accessibilityEnabled = 9593 AccessibilityManager.getInstance(mContext).isEnabled(); 9594 final boolean oldIncludeForAccessibility = accessibilityEnabled && includeForAccessibility(); 9595 9596 int old = mViewFlags; 9597 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 9598 9599 int changed = mViewFlags ^ old; 9600 if (changed == 0) { 9601 return; 9602 } 9603 int privateFlags = mPrivateFlags; 9604 9605 /* Check if the FOCUSABLE bit has changed */ 9606 if (((changed & FOCUSABLE_MASK) != 0) && 9607 ((privateFlags & PFLAG_HAS_BOUNDS) !=0)) { 9608 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 9609 && ((privateFlags & PFLAG_FOCUSED) != 0)) { 9610 /* Give up focus if we are no longer focusable */ 9611 clearFocus(); 9612 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 9613 && ((privateFlags & PFLAG_FOCUSED) == 0)) { 9614 /* 9615 * Tell the view system that we are now available to take focus 9616 * if no one else already has it. 9617 */ 9618 if (mParent != null) mParent.focusableViewAvailable(this); 9619 } 9620 } 9621 9622 final int newVisibility = flags & VISIBILITY_MASK; 9623 if (newVisibility == VISIBLE) { 9624 if ((changed & VISIBILITY_MASK) != 0) { 9625 /* 9626 * If this view is becoming visible, invalidate it in case it changed while 9627 * it was not visible. Marking it drawn ensures that the invalidation will 9628 * go through. 9629 */ 9630 mPrivateFlags |= PFLAG_DRAWN; 9631 invalidate(true); 9632 9633 needGlobalAttributesUpdate(true); 9634 9635 // a view becoming visible is worth notifying the parent 9636 // about in case nothing has focus. even if this specific view 9637 // isn't focusable, it may contain something that is, so let 9638 // the root view try to give this focus if nothing else does. 9639 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 9640 mParent.focusableViewAvailable(this); 9641 } 9642 } 9643 } 9644 9645 /* Check if the GONE bit has changed */ 9646 if ((changed & GONE) != 0) { 9647 needGlobalAttributesUpdate(false); 9648 requestLayout(); 9649 9650 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 9651 if (hasFocus()) clearFocus(); 9652 clearAccessibilityFocus(); 9653 destroyDrawingCache(); 9654 if (mParent instanceof View) { 9655 // GONE views noop invalidation, so invalidate the parent 9656 ((View) mParent).invalidate(true); 9657 } 9658 // Mark the view drawn to ensure that it gets invalidated properly the next 9659 // time it is visible and gets invalidated 9660 mPrivateFlags |= PFLAG_DRAWN; 9661 } 9662 if (mAttachInfo != null) { 9663 mAttachInfo.mViewVisibilityChanged = true; 9664 } 9665 } 9666 9667 /* Check if the VISIBLE bit has changed */ 9668 if ((changed & INVISIBLE) != 0) { 9669 needGlobalAttributesUpdate(false); 9670 /* 9671 * If this view is becoming invisible, set the DRAWN flag so that 9672 * the next invalidate() will not be skipped. 9673 */ 9674 mPrivateFlags |= PFLAG_DRAWN; 9675 9676 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE)) { 9677 // root view becoming invisible shouldn't clear focus and accessibility focus 9678 if (getRootView() != this) { 9679 if (hasFocus()) clearFocus(); 9680 clearAccessibilityFocus(); 9681 } 9682 } 9683 if (mAttachInfo != null) { 9684 mAttachInfo.mViewVisibilityChanged = true; 9685 } 9686 } 9687 9688 if ((changed & VISIBILITY_MASK) != 0) { 9689 // If the view is invisible, cleanup its display list to free up resources 9690 if (newVisibility != VISIBLE && mAttachInfo != null) { 9691 cleanupDraw(); 9692 } 9693 9694 if (mParent instanceof ViewGroup) { 9695 ((ViewGroup) mParent).onChildVisibilityChanged(this, 9696 (changed & VISIBILITY_MASK), newVisibility); 9697 ((View) mParent).invalidate(true); 9698 } else if (mParent != null) { 9699 mParent.invalidateChild(this, null); 9700 } 9701 dispatchVisibilityChanged(this, newVisibility); 9702 9703 notifySubtreeAccessibilityStateChangedIfNeeded(); 9704 } 9705 9706 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 9707 destroyDrawingCache(); 9708 } 9709 9710 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 9711 destroyDrawingCache(); 9712 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 9713 invalidateParentCaches(); 9714 } 9715 9716 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 9717 destroyDrawingCache(); 9718 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 9719 } 9720 9721 if ((changed & DRAW_MASK) != 0) { 9722 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 9723 if (mBackground != null) { 9724 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 9725 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 9726 } else { 9727 mPrivateFlags |= PFLAG_SKIP_DRAW; 9728 } 9729 } else { 9730 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 9731 } 9732 requestLayout(); 9733 invalidate(true); 9734 } 9735 9736 if ((changed & KEEP_SCREEN_ON) != 0) { 9737 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 9738 mParent.recomputeViewAttributes(this); 9739 } 9740 } 9741 9742 if (accessibilityEnabled) { 9743 if ((changed & FOCUSABLE_MASK) != 0 || (changed & VISIBILITY_MASK) != 0 9744 || (changed & CLICKABLE) != 0 || (changed & LONG_CLICKABLE) != 0) { 9745 if (oldIncludeForAccessibility != includeForAccessibility()) { 9746 notifySubtreeAccessibilityStateChangedIfNeeded(); 9747 } else { 9748 notifyViewAccessibilityStateChangedIfNeeded( 9749 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 9750 } 9751 } else if ((changed & ENABLED_MASK) != 0) { 9752 notifyViewAccessibilityStateChangedIfNeeded( 9753 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 9754 } 9755 } 9756 } 9757 9758 /** 9759 * Change the view's z order in the tree, so it's on top of other sibling 9760 * views. This ordering change may affect layout, if the parent container 9761 * uses an order-dependent layout scheme (e.g., LinearLayout). Prior 9762 * to {@link android.os.Build.VERSION_CODES#KITKAT} this 9763 * method should be followed by calls to {@link #requestLayout()} and 9764 * {@link View#invalidate()} on the view's parent to force the parent to redraw 9765 * with the new child ordering. 9766 * 9767 * @see ViewGroup#bringChildToFront(View) 9768 */ 9769 public void bringToFront() { 9770 if (mParent != null) { 9771 mParent.bringChildToFront(this); 9772 } 9773 } 9774 9775 /** 9776 * This is called in response to an internal scroll in this view (i.e., the 9777 * view scrolled its own contents). This is typically as a result of 9778 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 9779 * called. 9780 * 9781 * @param l Current horizontal scroll origin. 9782 * @param t Current vertical scroll origin. 9783 * @param oldl Previous horizontal scroll origin. 9784 * @param oldt Previous vertical scroll origin. 9785 */ 9786 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 9787 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 9788 postSendViewScrolledAccessibilityEventCallback(); 9789 } 9790 9791 mBackgroundSizeChanged = true; 9792 9793 final AttachInfo ai = mAttachInfo; 9794 if (ai != null) { 9795 ai.mViewScrollChanged = true; 9796 } 9797 } 9798 9799 /** 9800 * Interface definition for a callback to be invoked when the layout bounds of a view 9801 * changes due to layout processing. 9802 */ 9803 public interface OnLayoutChangeListener { 9804 /** 9805 * Called when the layout bounds of a view changes due to layout processing. 9806 * 9807 * @param v The view whose bounds have changed. 9808 * @param left The new value of the view's left property. 9809 * @param top The new value of the view's top property. 9810 * @param right The new value of the view's right property. 9811 * @param bottom The new value of the view's bottom property. 9812 * @param oldLeft The previous value of the view's left property. 9813 * @param oldTop The previous value of the view's top property. 9814 * @param oldRight The previous value of the view's right property. 9815 * @param oldBottom The previous value of the view's bottom property. 9816 */ 9817 void onLayoutChange(View v, int left, int top, int right, int bottom, 9818 int oldLeft, int oldTop, int oldRight, int oldBottom); 9819 } 9820 9821 /** 9822 * This is called during layout when the size of this view has changed. If 9823 * you were just added to the view hierarchy, you're called with the old 9824 * values of 0. 9825 * 9826 * @param w Current width of this view. 9827 * @param h Current height of this view. 9828 * @param oldw Old width of this view. 9829 * @param oldh Old height of this view. 9830 */ 9831 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 9832 } 9833 9834 /** 9835 * Called by draw to draw the child views. This may be overridden 9836 * by derived classes to gain control just before its children are drawn 9837 * (but after its own view has been drawn). 9838 * @param canvas the canvas on which to draw the view 9839 */ 9840 protected void dispatchDraw(Canvas canvas) { 9841 9842 } 9843 9844 /** 9845 * Gets the parent of this view. Note that the parent is a 9846 * ViewParent and not necessarily a View. 9847 * 9848 * @return Parent of this view. 9849 */ 9850 public final ViewParent getParent() { 9851 return mParent; 9852 } 9853 9854 /** 9855 * Set the horizontal scrolled position of your view. This will cause a call to 9856 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9857 * invalidated. 9858 * @param value the x position to scroll to 9859 */ 9860 public void setScrollX(int value) { 9861 scrollTo(value, mScrollY); 9862 } 9863 9864 /** 9865 * Set the vertical scrolled position of your view. This will cause a call to 9866 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9867 * invalidated. 9868 * @param value the y position to scroll to 9869 */ 9870 public void setScrollY(int value) { 9871 scrollTo(mScrollX, value); 9872 } 9873 9874 /** 9875 * Return the scrolled left position of this view. This is the left edge of 9876 * the displayed part of your view. You do not need to draw any pixels 9877 * farther left, since those are outside of the frame of your view on 9878 * screen. 9879 * 9880 * @return The left edge of the displayed part of your view, in pixels. 9881 */ 9882 public final int getScrollX() { 9883 return mScrollX; 9884 } 9885 9886 /** 9887 * Return the scrolled top position of this view. This is the top edge of 9888 * the displayed part of your view. You do not need to draw any pixels above 9889 * it, since those are outside of the frame of your view on screen. 9890 * 9891 * @return The top edge of the displayed part of your view, in pixels. 9892 */ 9893 public final int getScrollY() { 9894 return mScrollY; 9895 } 9896 9897 /** 9898 * Return the width of the your view. 9899 * 9900 * @return The width of your view, in pixels. 9901 */ 9902 @ViewDebug.ExportedProperty(category = "layout") 9903 public final int getWidth() { 9904 return mRight - mLeft; 9905 } 9906 9907 /** 9908 * Return the height of your view. 9909 * 9910 * @return The height of your view, in pixels. 9911 */ 9912 @ViewDebug.ExportedProperty(category = "layout") 9913 public final int getHeight() { 9914 return mBottom - mTop; 9915 } 9916 9917 /** 9918 * Return the visible drawing bounds of your view. Fills in the output 9919 * rectangle with the values from getScrollX(), getScrollY(), 9920 * getWidth(), and getHeight(). These bounds do not account for any 9921 * transformation properties currently set on the view, such as 9922 * {@link #setScaleX(float)} or {@link #setRotation(float)}. 9923 * 9924 * @param outRect The (scrolled) drawing bounds of the view. 9925 */ 9926 public void getDrawingRect(Rect outRect) { 9927 outRect.left = mScrollX; 9928 outRect.top = mScrollY; 9929 outRect.right = mScrollX + (mRight - mLeft); 9930 outRect.bottom = mScrollY + (mBottom - mTop); 9931 } 9932 9933 /** 9934 * Like {@link #getMeasuredWidthAndState()}, but only returns the 9935 * raw width component (that is the result is masked by 9936 * {@link #MEASURED_SIZE_MASK}). 9937 * 9938 * @return The raw measured width of this view. 9939 */ 9940 public final int getMeasuredWidth() { 9941 return mMeasuredWidth & MEASURED_SIZE_MASK; 9942 } 9943 9944 /** 9945 * Return the full width measurement information for this view as computed 9946 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 9947 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 9948 * This should be used during measurement and layout calculations only. Use 9949 * {@link #getWidth()} to see how wide a view is after layout. 9950 * 9951 * @return The measured width of this view as a bit mask. 9952 */ 9953 public final int getMeasuredWidthAndState() { 9954 return mMeasuredWidth; 9955 } 9956 9957 /** 9958 * Like {@link #getMeasuredHeightAndState()}, but only returns the 9959 * raw width component (that is the result is masked by 9960 * {@link #MEASURED_SIZE_MASK}). 9961 * 9962 * @return The raw measured height of this view. 9963 */ 9964 public final int getMeasuredHeight() { 9965 return mMeasuredHeight & MEASURED_SIZE_MASK; 9966 } 9967 9968 /** 9969 * Return the full height measurement information for this view as computed 9970 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 9971 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 9972 * This should be used during measurement and layout calculations only. Use 9973 * {@link #getHeight()} to see how wide a view is after layout. 9974 * 9975 * @return The measured width of this view as a bit mask. 9976 */ 9977 public final int getMeasuredHeightAndState() { 9978 return mMeasuredHeight; 9979 } 9980 9981 /** 9982 * Return only the state bits of {@link #getMeasuredWidthAndState()} 9983 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 9984 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 9985 * and the height component is at the shifted bits 9986 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 9987 */ 9988 public final int getMeasuredState() { 9989 return (mMeasuredWidth&MEASURED_STATE_MASK) 9990 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 9991 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 9992 } 9993 9994 /** 9995 * The transform matrix of this view, which is calculated based on the current 9996 * rotation, scale, and pivot properties. 9997 * 9998 * @see #getRotation() 9999 * @see #getScaleX() 10000 * @see #getScaleY() 10001 * @see #getPivotX() 10002 * @see #getPivotY() 10003 * @return The current transform matrix for the view 10004 */ 10005 public Matrix getMatrix() { 10006 ensureTransformationInfo(); 10007 final Matrix matrix = mTransformationInfo.mMatrix; 10008 mRenderNode.getMatrix(matrix); 10009 return matrix; 10010 } 10011 10012 /** 10013 * Returns true if the transform matrix is the identity matrix. 10014 * Recomputes the matrix if necessary. 10015 * 10016 * @return True if the transform matrix is the identity matrix, false otherwise. 10017 */ 10018 final boolean hasIdentityMatrix() { 10019 return mRenderNode.hasIdentityMatrix(); 10020 } 10021 10022 void ensureTransformationInfo() { 10023 if (mTransformationInfo == null) { 10024 mTransformationInfo = new TransformationInfo(); 10025 } 10026 } 10027 10028 /** 10029 * Utility method to retrieve the inverse of the current mMatrix property. 10030 * We cache the matrix to avoid recalculating it when transform properties 10031 * have not changed. 10032 * 10033 * @return The inverse of the current matrix of this view. 10034 * @hide 10035 */ 10036 public final Matrix getInverseMatrix() { 10037 ensureTransformationInfo(); 10038 if (mTransformationInfo.mInverseMatrix == null) { 10039 mTransformationInfo.mInverseMatrix = new Matrix(); 10040 } 10041 final Matrix matrix = mTransformationInfo.mInverseMatrix; 10042 mRenderNode.getInverseMatrix(matrix); 10043 return matrix; 10044 } 10045 10046 /** 10047 * Gets the distance along the Z axis from the camera to this view. 10048 * 10049 * @see #setCameraDistance(float) 10050 * 10051 * @return The distance along the Z axis. 10052 */ 10053 public float getCameraDistance() { 10054 final float dpi = mResources.getDisplayMetrics().densityDpi; 10055 return -(mRenderNode.getCameraDistance() * dpi); 10056 } 10057 10058 /** 10059 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 10060 * views are drawn) from the camera to this view. The camera's distance 10061 * affects 3D transformations, for instance rotations around the X and Y 10062 * axis. If the rotationX or rotationY properties are changed and this view is 10063 * large (more than half the size of the screen), it is recommended to always 10064 * use a camera distance that's greater than the height (X axis rotation) or 10065 * the width (Y axis rotation) of this view.</p> 10066 * 10067 * <p>The distance of the camera from the view plane can have an affect on the 10068 * perspective distortion of the view when it is rotated around the x or y axis. 10069 * For example, a large distance will result in a large viewing angle, and there 10070 * will not be much perspective distortion of the view as it rotates. A short 10071 * distance may cause much more perspective distortion upon rotation, and can 10072 * also result in some drawing artifacts if the rotated view ends up partially 10073 * behind the camera (which is why the recommendation is to use a distance at 10074 * least as far as the size of the view, if the view is to be rotated.)</p> 10075 * 10076 * <p>The distance is expressed in "depth pixels." The default distance depends 10077 * on the screen density. For instance, on a medium density display, the 10078 * default distance is 1280. On a high density display, the default distance 10079 * is 1920.</p> 10080 * 10081 * <p>If you want to specify a distance that leads to visually consistent 10082 * results across various densities, use the following formula:</p> 10083 * <pre> 10084 * float scale = context.getResources().getDisplayMetrics().density; 10085 * view.setCameraDistance(distance * scale); 10086 * </pre> 10087 * 10088 * <p>The density scale factor of a high density display is 1.5, 10089 * and 1920 = 1280 * 1.5.</p> 10090 * 10091 * @param distance The distance in "depth pixels", if negative the opposite 10092 * value is used 10093 * 10094 * @see #setRotationX(float) 10095 * @see #setRotationY(float) 10096 */ 10097 public void setCameraDistance(float distance) { 10098 final float dpi = mResources.getDisplayMetrics().densityDpi; 10099 10100 invalidateViewProperty(true, false); 10101 mRenderNode.setCameraDistance(-Math.abs(distance) / dpi); 10102 invalidateViewProperty(false, false); 10103 10104 invalidateParentIfNeededAndWasQuickRejected(); 10105 } 10106 10107 /** 10108 * The degrees that the view is rotated around the pivot point. 10109 * 10110 * @see #setRotation(float) 10111 * @see #getPivotX() 10112 * @see #getPivotY() 10113 * 10114 * @return The degrees of rotation. 10115 */ 10116 @ViewDebug.ExportedProperty(category = "drawing") 10117 public float getRotation() { 10118 return mRenderNode.getRotation(); 10119 } 10120 10121 /** 10122 * Sets the degrees that the view is rotated around the pivot point. Increasing values 10123 * result in clockwise rotation. 10124 * 10125 * @param rotation The degrees of rotation. 10126 * 10127 * @see #getRotation() 10128 * @see #getPivotX() 10129 * @see #getPivotY() 10130 * @see #setRotationX(float) 10131 * @see #setRotationY(float) 10132 * 10133 * @attr ref android.R.styleable#View_rotation 10134 */ 10135 public void setRotation(float rotation) { 10136 if (rotation != getRotation()) { 10137 // Double-invalidation is necessary to capture view's old and new areas 10138 invalidateViewProperty(true, false); 10139 mRenderNode.setRotation(rotation); 10140 invalidateViewProperty(false, true); 10141 10142 invalidateParentIfNeededAndWasQuickRejected(); 10143 notifySubtreeAccessibilityStateChangedIfNeeded(); 10144 } 10145 } 10146 10147 /** 10148 * The degrees that the view is rotated around the vertical axis through the pivot point. 10149 * 10150 * @see #getPivotX() 10151 * @see #getPivotY() 10152 * @see #setRotationY(float) 10153 * 10154 * @return The degrees of Y rotation. 10155 */ 10156 @ViewDebug.ExportedProperty(category = "drawing") 10157 public float getRotationY() { 10158 return mRenderNode.getRotationY(); 10159 } 10160 10161 /** 10162 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 10163 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 10164 * down the y axis. 10165 * 10166 * When rotating large views, it is recommended to adjust the camera distance 10167 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 10168 * 10169 * @param rotationY The degrees of Y rotation. 10170 * 10171 * @see #getRotationY() 10172 * @see #getPivotX() 10173 * @see #getPivotY() 10174 * @see #setRotation(float) 10175 * @see #setRotationX(float) 10176 * @see #setCameraDistance(float) 10177 * 10178 * @attr ref android.R.styleable#View_rotationY 10179 */ 10180 public void setRotationY(float rotationY) { 10181 if (rotationY != getRotationY()) { 10182 invalidateViewProperty(true, false); 10183 mRenderNode.setRotationY(rotationY); 10184 invalidateViewProperty(false, true); 10185 10186 invalidateParentIfNeededAndWasQuickRejected(); 10187 notifySubtreeAccessibilityStateChangedIfNeeded(); 10188 } 10189 } 10190 10191 /** 10192 * The degrees that the view is rotated around the horizontal axis through the pivot point. 10193 * 10194 * @see #getPivotX() 10195 * @see #getPivotY() 10196 * @see #setRotationX(float) 10197 * 10198 * @return The degrees of X rotation. 10199 */ 10200 @ViewDebug.ExportedProperty(category = "drawing") 10201 public float getRotationX() { 10202 return mRenderNode.getRotationX(); 10203 } 10204 10205 /** 10206 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 10207 * Increasing values result in clockwise rotation from the viewpoint of looking down the 10208 * x axis. 10209 * 10210 * When rotating large views, it is recommended to adjust the camera distance 10211 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 10212 * 10213 * @param rotationX The degrees of X rotation. 10214 * 10215 * @see #getRotationX() 10216 * @see #getPivotX() 10217 * @see #getPivotY() 10218 * @see #setRotation(float) 10219 * @see #setRotationY(float) 10220 * @see #setCameraDistance(float) 10221 * 10222 * @attr ref android.R.styleable#View_rotationX 10223 */ 10224 public void setRotationX(float rotationX) { 10225 if (rotationX != getRotationX()) { 10226 invalidateViewProperty(true, false); 10227 mRenderNode.setRotationX(rotationX); 10228 invalidateViewProperty(false, true); 10229 10230 invalidateParentIfNeededAndWasQuickRejected(); 10231 notifySubtreeAccessibilityStateChangedIfNeeded(); 10232 } 10233 } 10234 10235 /** 10236 * The amount that the view is scaled in x around the pivot point, as a proportion of 10237 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 10238 * 10239 * <p>By default, this is 1.0f. 10240 * 10241 * @see #getPivotX() 10242 * @see #getPivotY() 10243 * @return The scaling factor. 10244 */ 10245 @ViewDebug.ExportedProperty(category = "drawing") 10246 public float getScaleX() { 10247 return mRenderNode.getScaleX(); 10248 } 10249 10250 /** 10251 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 10252 * the view's unscaled width. A value of 1 means that no scaling is applied. 10253 * 10254 * @param scaleX The scaling factor. 10255 * @see #getPivotX() 10256 * @see #getPivotY() 10257 * 10258 * @attr ref android.R.styleable#View_scaleX 10259 */ 10260 public void setScaleX(float scaleX) { 10261 if (scaleX != getScaleX()) { 10262 invalidateViewProperty(true, false); 10263 mRenderNode.setScaleX(scaleX); 10264 invalidateViewProperty(false, true); 10265 10266 invalidateParentIfNeededAndWasQuickRejected(); 10267 notifySubtreeAccessibilityStateChangedIfNeeded(); 10268 } 10269 } 10270 10271 /** 10272 * The amount that the view is scaled in y around the pivot point, as a proportion of 10273 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 10274 * 10275 * <p>By default, this is 1.0f. 10276 * 10277 * @see #getPivotX() 10278 * @see #getPivotY() 10279 * @return The scaling factor. 10280 */ 10281 @ViewDebug.ExportedProperty(category = "drawing") 10282 public float getScaleY() { 10283 return mRenderNode.getScaleY(); 10284 } 10285 10286 /** 10287 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 10288 * the view's unscaled width. A value of 1 means that no scaling is applied. 10289 * 10290 * @param scaleY The scaling factor. 10291 * @see #getPivotX() 10292 * @see #getPivotY() 10293 * 10294 * @attr ref android.R.styleable#View_scaleY 10295 */ 10296 public void setScaleY(float scaleY) { 10297 if (scaleY != getScaleY()) { 10298 invalidateViewProperty(true, false); 10299 mRenderNode.setScaleY(scaleY); 10300 invalidateViewProperty(false, true); 10301 10302 invalidateParentIfNeededAndWasQuickRejected(); 10303 notifySubtreeAccessibilityStateChangedIfNeeded(); 10304 } 10305 } 10306 10307 /** 10308 * The x location of the point around which the view is {@link #setRotation(float) rotated} 10309 * and {@link #setScaleX(float) scaled}. 10310 * 10311 * @see #getRotation() 10312 * @see #getScaleX() 10313 * @see #getScaleY() 10314 * @see #getPivotY() 10315 * @return The x location of the pivot point. 10316 * 10317 * @attr ref android.R.styleable#View_transformPivotX 10318 */ 10319 @ViewDebug.ExportedProperty(category = "drawing") 10320 public float getPivotX() { 10321 return mRenderNode.getPivotX(); 10322 } 10323 10324 /** 10325 * Sets the x location of the point around which the view is 10326 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 10327 * By default, the pivot point is centered on the object. 10328 * Setting this property disables this behavior and causes the view to use only the 10329 * explicitly set pivotX and pivotY values. 10330 * 10331 * @param pivotX The x location of the pivot point. 10332 * @see #getRotation() 10333 * @see #getScaleX() 10334 * @see #getScaleY() 10335 * @see #getPivotY() 10336 * 10337 * @attr ref android.R.styleable#View_transformPivotX 10338 */ 10339 public void setPivotX(float pivotX) { 10340 if (!mRenderNode.isPivotExplicitlySet() || pivotX != getPivotX()) { 10341 invalidateViewProperty(true, false); 10342 mRenderNode.setPivotX(pivotX); 10343 invalidateViewProperty(false, true); 10344 10345 invalidateParentIfNeededAndWasQuickRejected(); 10346 } 10347 } 10348 10349 /** 10350 * The y location of the point around which the view is {@link #setRotation(float) rotated} 10351 * and {@link #setScaleY(float) scaled}. 10352 * 10353 * @see #getRotation() 10354 * @see #getScaleX() 10355 * @see #getScaleY() 10356 * @see #getPivotY() 10357 * @return The y location of the pivot point. 10358 * 10359 * @attr ref android.R.styleable#View_transformPivotY 10360 */ 10361 @ViewDebug.ExportedProperty(category = "drawing") 10362 public float getPivotY() { 10363 return mRenderNode.getPivotY(); 10364 } 10365 10366 /** 10367 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 10368 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 10369 * Setting this property disables this behavior and causes the view to use only the 10370 * explicitly set pivotX and pivotY values. 10371 * 10372 * @param pivotY The y location of the pivot point. 10373 * @see #getRotation() 10374 * @see #getScaleX() 10375 * @see #getScaleY() 10376 * @see #getPivotY() 10377 * 10378 * @attr ref android.R.styleable#View_transformPivotY 10379 */ 10380 public void setPivotY(float pivotY) { 10381 if (!mRenderNode.isPivotExplicitlySet() || pivotY != getPivotY()) { 10382 invalidateViewProperty(true, false); 10383 mRenderNode.setPivotY(pivotY); 10384 invalidateViewProperty(false, true); 10385 10386 invalidateParentIfNeededAndWasQuickRejected(); 10387 } 10388 } 10389 10390 /** 10391 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 10392 * completely transparent and 1 means the view is completely opaque. 10393 * 10394 * <p>By default this is 1.0f. 10395 * @return The opacity of the view. 10396 */ 10397 @ViewDebug.ExportedProperty(category = "drawing") 10398 public float getAlpha() { 10399 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 10400 } 10401 10402 /** 10403 * Returns whether this View has content which overlaps. 10404 * 10405 * <p>This function, intended to be overridden by specific View types, is an optimization when 10406 * alpha is set on a view. If rendering overlaps in a view with alpha < 1, that view is drawn to 10407 * an offscreen buffer and then composited into place, which can be expensive. If the view has 10408 * no overlapping rendering, the view can draw each primitive with the appropriate alpha value 10409 * directly. An example of overlapping rendering is a TextView with a background image, such as 10410 * a Button. An example of non-overlapping rendering is a TextView with no background, or an 10411 * ImageView with only the foreground image. The default implementation returns true; subclasses 10412 * should override if they have cases which can be optimized.</p> 10413 * 10414 * <p>The current implementation of the saveLayer and saveLayerAlpha methods in {@link Canvas} 10415 * necessitates that a View return true if it uses the methods internally without passing the 10416 * {@link Canvas#CLIP_TO_LAYER_SAVE_FLAG}.</p> 10417 * 10418 * @return true if the content in this view might overlap, false otherwise. 10419 */ 10420 @ViewDebug.ExportedProperty(category = "drawing") 10421 public boolean hasOverlappingRendering() { 10422 return true; 10423 } 10424 10425 /** 10426 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 10427 * completely transparent and 1 means the view is completely opaque.</p> 10428 * 10429 * <p> Note that setting alpha to a translucent value (0 < alpha < 1) can have significant 10430 * performance implications, especially for large views. It is best to use the alpha property 10431 * sparingly and transiently, as in the case of fading animations.</p> 10432 * 10433 * <p>For a view with a frequently changing alpha, such as during a fading animation, it is 10434 * strongly recommended for performance reasons to either override 10435 * {@link #hasOverlappingRendering()} to return false if appropriate, or setting a 10436 * {@link #setLayerType(int, android.graphics.Paint) layer type} on the view.</p> 10437 * 10438 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 10439 * responsible for applying the opacity itself.</p> 10440 * 10441 * <p>Note that if the view is backed by a 10442 * {@link #setLayerType(int, android.graphics.Paint) layer} and is associated with a 10443 * {@link #setLayerPaint(android.graphics.Paint) layer paint}, setting an alpha value less than 10444 * 1.0 will supercede the alpha of the layer paint.</p> 10445 * 10446 * @param alpha The opacity of the view. 10447 * 10448 * @see #hasOverlappingRendering() 10449 * @see #setLayerType(int, android.graphics.Paint) 10450 * 10451 * @attr ref android.R.styleable#View_alpha 10452 */ 10453 public void setAlpha(float alpha) { 10454 ensureTransformationInfo(); 10455 if (mTransformationInfo.mAlpha != alpha) { 10456 mTransformationInfo.mAlpha = alpha; 10457 if (onSetAlpha((int) (alpha * 255))) { 10458 mPrivateFlags |= PFLAG_ALPHA_SET; 10459 // subclass is handling alpha - don't optimize rendering cache invalidation 10460 invalidateParentCaches(); 10461 invalidate(true); 10462 } else { 10463 mPrivateFlags &= ~PFLAG_ALPHA_SET; 10464 invalidateViewProperty(true, false); 10465 mRenderNode.setAlpha(getFinalAlpha()); 10466 notifyViewAccessibilityStateChangedIfNeeded( 10467 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 10468 } 10469 } 10470 } 10471 10472 /** 10473 * Faster version of setAlpha() which performs the same steps except there are 10474 * no calls to invalidate(). The caller of this function should perform proper invalidation 10475 * on the parent and this object. The return value indicates whether the subclass handles 10476 * alpha (the return value for onSetAlpha()). 10477 * 10478 * @param alpha The new value for the alpha property 10479 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 10480 * the new value for the alpha property is different from the old value 10481 */ 10482 boolean setAlphaNoInvalidation(float alpha) { 10483 ensureTransformationInfo(); 10484 if (mTransformationInfo.mAlpha != alpha) { 10485 mTransformationInfo.mAlpha = alpha; 10486 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 10487 if (subclassHandlesAlpha) { 10488 mPrivateFlags |= PFLAG_ALPHA_SET; 10489 return true; 10490 } else { 10491 mPrivateFlags &= ~PFLAG_ALPHA_SET; 10492 mRenderNode.setAlpha(getFinalAlpha()); 10493 } 10494 } 10495 return false; 10496 } 10497 10498 /** 10499 * This property is hidden and intended only for use by the Fade transition, which 10500 * animates it to produce a visual translucency that does not side-effect (or get 10501 * affected by) the real alpha property. This value is composited with the other 10502 * alpha value (and the AlphaAnimation value, when that is present) to produce 10503 * a final visual translucency result, which is what is passed into the DisplayList. 10504 * 10505 * @hide 10506 */ 10507 public void setTransitionAlpha(float alpha) { 10508 ensureTransformationInfo(); 10509 if (mTransformationInfo.mTransitionAlpha != alpha) { 10510 mTransformationInfo.mTransitionAlpha = alpha; 10511 mPrivateFlags &= ~PFLAG_ALPHA_SET; 10512 invalidateViewProperty(true, false); 10513 mRenderNode.setAlpha(getFinalAlpha()); 10514 } 10515 } 10516 10517 /** 10518 * Calculates the visual alpha of this view, which is a combination of the actual 10519 * alpha value and the transitionAlpha value (if set). 10520 */ 10521 private float getFinalAlpha() { 10522 if (mTransformationInfo != null) { 10523 return mTransformationInfo.mAlpha * mTransformationInfo.mTransitionAlpha; 10524 } 10525 return 1; 10526 } 10527 10528 /** 10529 * This property is hidden and intended only for use by the Fade transition, which 10530 * animates it to produce a visual translucency that does not side-effect (or get 10531 * affected by) the real alpha property. This value is composited with the other 10532 * alpha value (and the AlphaAnimation value, when that is present) to produce 10533 * a final visual translucency result, which is what is passed into the DisplayList. 10534 * 10535 * @hide 10536 */ 10537 @ViewDebug.ExportedProperty(category = "drawing") 10538 public float getTransitionAlpha() { 10539 return mTransformationInfo != null ? mTransformationInfo.mTransitionAlpha : 1; 10540 } 10541 10542 /** 10543 * Top position of this view relative to its parent. 10544 * 10545 * @return The top of this view, in pixels. 10546 */ 10547 @ViewDebug.CapturedViewProperty 10548 public final int getTop() { 10549 return mTop; 10550 } 10551 10552 /** 10553 * Sets the top position of this view relative to its parent. This method is meant to be called 10554 * by the layout system and should not generally be called otherwise, because the property 10555 * may be changed at any time by the layout. 10556 * 10557 * @param top The top of this view, in pixels. 10558 */ 10559 public final void setTop(int top) { 10560 if (top != mTop) { 10561 final boolean matrixIsIdentity = hasIdentityMatrix(); 10562 if (matrixIsIdentity) { 10563 if (mAttachInfo != null) { 10564 int minTop; 10565 int yLoc; 10566 if (top < mTop) { 10567 minTop = top; 10568 yLoc = top - mTop; 10569 } else { 10570 minTop = mTop; 10571 yLoc = 0; 10572 } 10573 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 10574 } 10575 } else { 10576 // Double-invalidation is necessary to capture view's old and new areas 10577 invalidate(true); 10578 } 10579 10580 int width = mRight - mLeft; 10581 int oldHeight = mBottom - mTop; 10582 10583 mTop = top; 10584 mRenderNode.setTop(mTop); 10585 10586 sizeChange(width, mBottom - mTop, width, oldHeight); 10587 10588 if (!matrixIsIdentity) { 10589 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10590 invalidate(true); 10591 } 10592 mBackgroundSizeChanged = true; 10593 invalidateParentIfNeeded(); 10594 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10595 // View was rejected last time it was drawn by its parent; this may have changed 10596 invalidateParentIfNeeded(); 10597 } 10598 } 10599 } 10600 10601 /** 10602 * Bottom position of this view relative to its parent. 10603 * 10604 * @return The bottom of this view, in pixels. 10605 */ 10606 @ViewDebug.CapturedViewProperty 10607 public final int getBottom() { 10608 return mBottom; 10609 } 10610 10611 /** 10612 * True if this view has changed since the last time being drawn. 10613 * 10614 * @return The dirty state of this view. 10615 */ 10616 public boolean isDirty() { 10617 return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0; 10618 } 10619 10620 /** 10621 * Sets the bottom position of this view relative to its parent. This method is meant to be 10622 * called by the layout system and should not generally be called otherwise, because the 10623 * property may be changed at any time by the layout. 10624 * 10625 * @param bottom The bottom of this view, in pixels. 10626 */ 10627 public final void setBottom(int bottom) { 10628 if (bottom != mBottom) { 10629 final boolean matrixIsIdentity = hasIdentityMatrix(); 10630 if (matrixIsIdentity) { 10631 if (mAttachInfo != null) { 10632 int maxBottom; 10633 if (bottom < mBottom) { 10634 maxBottom = mBottom; 10635 } else { 10636 maxBottom = bottom; 10637 } 10638 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 10639 } 10640 } else { 10641 // Double-invalidation is necessary to capture view's old and new areas 10642 invalidate(true); 10643 } 10644 10645 int width = mRight - mLeft; 10646 int oldHeight = mBottom - mTop; 10647 10648 mBottom = bottom; 10649 mRenderNode.setBottom(mBottom); 10650 10651 sizeChange(width, mBottom - mTop, width, oldHeight); 10652 10653 if (!matrixIsIdentity) { 10654 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10655 invalidate(true); 10656 } 10657 mBackgroundSizeChanged = true; 10658 invalidateParentIfNeeded(); 10659 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10660 // View was rejected last time it was drawn by its parent; this may have changed 10661 invalidateParentIfNeeded(); 10662 } 10663 } 10664 } 10665 10666 /** 10667 * Left position of this view relative to its parent. 10668 * 10669 * @return The left edge of this view, in pixels. 10670 */ 10671 @ViewDebug.CapturedViewProperty 10672 public final int getLeft() { 10673 return mLeft; 10674 } 10675 10676 /** 10677 * Sets the left position of this view relative to its parent. This method is meant to be called 10678 * by the layout system and should not generally be called otherwise, because the property 10679 * may be changed at any time by the layout. 10680 * 10681 * @param left The left of this view, in pixels. 10682 */ 10683 public final void setLeft(int left) { 10684 if (left != mLeft) { 10685 final boolean matrixIsIdentity = hasIdentityMatrix(); 10686 if (matrixIsIdentity) { 10687 if (mAttachInfo != null) { 10688 int minLeft; 10689 int xLoc; 10690 if (left < mLeft) { 10691 minLeft = left; 10692 xLoc = left - mLeft; 10693 } else { 10694 minLeft = mLeft; 10695 xLoc = 0; 10696 } 10697 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 10698 } 10699 } else { 10700 // Double-invalidation is necessary to capture view's old and new areas 10701 invalidate(true); 10702 } 10703 10704 int oldWidth = mRight - mLeft; 10705 int height = mBottom - mTop; 10706 10707 mLeft = left; 10708 mRenderNode.setLeft(left); 10709 10710 sizeChange(mRight - mLeft, height, oldWidth, height); 10711 10712 if (!matrixIsIdentity) { 10713 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10714 invalidate(true); 10715 } 10716 mBackgroundSizeChanged = true; 10717 invalidateParentIfNeeded(); 10718 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10719 // View was rejected last time it was drawn by its parent; this may have changed 10720 invalidateParentIfNeeded(); 10721 } 10722 } 10723 } 10724 10725 /** 10726 * Right position of this view relative to its parent. 10727 * 10728 * @return The right edge of this view, in pixels. 10729 */ 10730 @ViewDebug.CapturedViewProperty 10731 public final int getRight() { 10732 return mRight; 10733 } 10734 10735 /** 10736 * Sets the right position of this view relative to its parent. This method is meant to be called 10737 * by the layout system and should not generally be called otherwise, because the property 10738 * may be changed at any time by the layout. 10739 * 10740 * @param right The right of this view, in pixels. 10741 */ 10742 public final void setRight(int right) { 10743 if (right != mRight) { 10744 final boolean matrixIsIdentity = hasIdentityMatrix(); 10745 if (matrixIsIdentity) { 10746 if (mAttachInfo != null) { 10747 int maxRight; 10748 if (right < mRight) { 10749 maxRight = mRight; 10750 } else { 10751 maxRight = right; 10752 } 10753 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 10754 } 10755 } else { 10756 // Double-invalidation is necessary to capture view's old and new areas 10757 invalidate(true); 10758 } 10759 10760 int oldWidth = mRight - mLeft; 10761 int height = mBottom - mTop; 10762 10763 mRight = right; 10764 mRenderNode.setRight(mRight); 10765 10766 sizeChange(mRight - mLeft, height, oldWidth, height); 10767 10768 if (!matrixIsIdentity) { 10769 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10770 invalidate(true); 10771 } 10772 mBackgroundSizeChanged = true; 10773 invalidateParentIfNeeded(); 10774 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10775 // View was rejected last time it was drawn by its parent; this may have changed 10776 invalidateParentIfNeeded(); 10777 } 10778 } 10779 } 10780 10781 /** 10782 * The visual x position of this view, in pixels. This is equivalent to the 10783 * {@link #setTranslationX(float) translationX} property plus the current 10784 * {@link #getLeft() left} property. 10785 * 10786 * @return The visual x position of this view, in pixels. 10787 */ 10788 @ViewDebug.ExportedProperty(category = "drawing") 10789 public float getX() { 10790 return mLeft + getTranslationX(); 10791 } 10792 10793 /** 10794 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 10795 * {@link #setTranslationX(float) translationX} property to be the difference between 10796 * the x value passed in and the current {@link #getLeft() left} property. 10797 * 10798 * @param x The visual x position of this view, in pixels. 10799 */ 10800 public void setX(float x) { 10801 setTranslationX(x - mLeft); 10802 } 10803 10804 /** 10805 * The visual y position of this view, in pixels. This is equivalent to the 10806 * {@link #setTranslationY(float) translationY} property plus the current 10807 * {@link #getTop() top} property. 10808 * 10809 * @return The visual y position of this view, in pixels. 10810 */ 10811 @ViewDebug.ExportedProperty(category = "drawing") 10812 public float getY() { 10813 return mTop + getTranslationY(); 10814 } 10815 10816 /** 10817 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 10818 * {@link #setTranslationY(float) translationY} property to be the difference between 10819 * the y value passed in and the current {@link #getTop() top} property. 10820 * 10821 * @param y The visual y position of this view, in pixels. 10822 */ 10823 public void setY(float y) { 10824 setTranslationY(y - mTop); 10825 } 10826 10827 /** 10828 * The visual z position of this view, in pixels. This is equivalent to the 10829 * {@link #setTranslationZ(float) translationZ} property plus the current 10830 * {@link #getElevation() elevation} property. 10831 * 10832 * @return The visual z position of this view, in pixels. 10833 */ 10834 @ViewDebug.ExportedProperty(category = "drawing") 10835 public float getZ() { 10836 return getElevation() + getTranslationZ(); 10837 } 10838 10839 /** 10840 * Sets the visual z position of this view, in pixels. This is equivalent to setting the 10841 * {@link #setTranslationZ(float) translationZ} property to be the difference between 10842 * the x value passed in and the current {@link #getElevation() elevation} property. 10843 * 10844 * @param z The visual z position of this view, in pixels. 10845 */ 10846 public void setZ(float z) { 10847 setTranslationZ(z - getElevation()); 10848 } 10849 10850 /** 10851 * The base elevation of this view relative to its parent, in pixels. 10852 * 10853 * @return The base depth position of the view, in pixels. 10854 */ 10855 @ViewDebug.ExportedProperty(category = "drawing") 10856 public float getElevation() { 10857 return mRenderNode.getElevation(); 10858 } 10859 10860 /** 10861 * Sets the base elevation of this view, in pixels. 10862 * 10863 * @attr ref android.R.styleable#View_elevation 10864 */ 10865 public void setElevation(float elevation) { 10866 if (elevation != getElevation()) { 10867 invalidateViewProperty(true, false); 10868 mRenderNode.setElevation(elevation); 10869 invalidateViewProperty(false, true); 10870 10871 invalidateParentIfNeededAndWasQuickRejected(); 10872 } 10873 } 10874 10875 /** 10876 * The horizontal location of this view relative to its {@link #getLeft() left} position. 10877 * This position is post-layout, in addition to wherever the object's 10878 * layout placed it. 10879 * 10880 * @return The horizontal position of this view relative to its left position, in pixels. 10881 */ 10882 @ViewDebug.ExportedProperty(category = "drawing") 10883 public float getTranslationX() { 10884 return mRenderNode.getTranslationX(); 10885 } 10886 10887 /** 10888 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 10889 * This effectively positions the object post-layout, in addition to wherever the object's 10890 * layout placed it. 10891 * 10892 * @param translationX The horizontal position of this view relative to its left position, 10893 * in pixels. 10894 * 10895 * @attr ref android.R.styleable#View_translationX 10896 */ 10897 public void setTranslationX(float translationX) { 10898 if (translationX != getTranslationX()) { 10899 invalidateViewProperty(true, false); 10900 mRenderNode.setTranslationX(translationX); 10901 invalidateViewProperty(false, true); 10902 10903 invalidateParentIfNeededAndWasQuickRejected(); 10904 notifySubtreeAccessibilityStateChangedIfNeeded(); 10905 } 10906 } 10907 10908 /** 10909 * The vertical location of this view relative to its {@link #getTop() top} position. 10910 * This position is post-layout, in addition to wherever the object's 10911 * layout placed it. 10912 * 10913 * @return The vertical position of this view relative to its top position, 10914 * in pixels. 10915 */ 10916 @ViewDebug.ExportedProperty(category = "drawing") 10917 public float getTranslationY() { 10918 return mRenderNode.getTranslationY(); 10919 } 10920 10921 /** 10922 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 10923 * This effectively positions the object post-layout, in addition to wherever the object's 10924 * layout placed it. 10925 * 10926 * @param translationY The vertical position of this view relative to its top position, 10927 * in pixels. 10928 * 10929 * @attr ref android.R.styleable#View_translationY 10930 */ 10931 public void setTranslationY(float translationY) { 10932 if (translationY != getTranslationY()) { 10933 invalidateViewProperty(true, false); 10934 mRenderNode.setTranslationY(translationY); 10935 invalidateViewProperty(false, true); 10936 10937 invalidateParentIfNeededAndWasQuickRejected(); 10938 } 10939 } 10940 10941 /** 10942 * The depth location of this view relative to its {@link #getElevation() elevation}. 10943 * 10944 * @return The depth of this view relative to its elevation. 10945 */ 10946 @ViewDebug.ExportedProperty(category = "drawing") 10947 public float getTranslationZ() { 10948 return mRenderNode.getTranslationZ(); 10949 } 10950 10951 /** 10952 * Sets the depth location of this view relative to its {@link #getElevation() elevation}. 10953 * 10954 * @attr ref android.R.styleable#View_translationZ 10955 */ 10956 public void setTranslationZ(float translationZ) { 10957 if (translationZ != getTranslationZ()) { 10958 invalidateViewProperty(true, false); 10959 mRenderNode.setTranslationZ(translationZ); 10960 invalidateViewProperty(false, true); 10961 10962 invalidateParentIfNeededAndWasQuickRejected(); 10963 } 10964 } 10965 10966 /** @hide */ 10967 public void setAnimationMatrix(Matrix matrix) { 10968 invalidateViewProperty(true, false); 10969 mRenderNode.setAnimationMatrix(matrix); 10970 invalidateViewProperty(false, true); 10971 10972 invalidateParentIfNeededAndWasQuickRejected(); 10973 } 10974 10975 /** 10976 * Returns the current StateListAnimator if exists. 10977 * 10978 * @return StateListAnimator or null if it does not exists 10979 * @see #setStateListAnimator(android.animation.StateListAnimator) 10980 */ 10981 public StateListAnimator getStateListAnimator() { 10982 return mStateListAnimator; 10983 } 10984 10985 /** 10986 * Attaches the provided StateListAnimator to this View. 10987 * <p> 10988 * Any previously attached StateListAnimator will be detached. 10989 * 10990 * @param stateListAnimator The StateListAnimator to update the view 10991 * @see {@link android.animation.StateListAnimator} 10992 */ 10993 public void setStateListAnimator(StateListAnimator stateListAnimator) { 10994 if (mStateListAnimator == stateListAnimator) { 10995 return; 10996 } 10997 if (mStateListAnimator != null) { 10998 mStateListAnimator.setTarget(null); 10999 } 11000 mStateListAnimator = stateListAnimator; 11001 if (stateListAnimator != null) { 11002 stateListAnimator.setTarget(this); 11003 if (isAttachedToWindow()) { 11004 stateListAnimator.setState(getDrawableState()); 11005 } 11006 } 11007 } 11008 11009 /** 11010 * Returns whether the Outline should be used to clip the contents of the View. 11011 * <p> 11012 * Note that this flag will only be respected if the View's Outline returns true from 11013 * {@link Outline#canClip()}. 11014 * 11015 * @see #setOutlineProvider(ViewOutlineProvider) 11016 * @see #setClipToOutline(boolean) 11017 */ 11018 public final boolean getClipToOutline() { 11019 return mRenderNode.getClipToOutline(); 11020 } 11021 11022 /** 11023 * Sets whether the View's Outline should be used to clip the contents of the View. 11024 * <p> 11025 * Only a single non-rectangular clip can be applied on a View at any time. 11026 * Circular clips from a {@link ViewAnimationUtils#createCircularReveal(View, int, int, float, float) 11027 * circular reveal} animation take priority over Outline clipping, and 11028 * child Outline clipping takes priority over Outline clipping done by a 11029 * parent. 11030 * <p> 11031 * Note that this flag will only be respected if the View's Outline returns true from 11032 * {@link Outline#canClip()}. 11033 * 11034 * @see #setOutlineProvider(ViewOutlineProvider) 11035 * @see #getClipToOutline() 11036 */ 11037 public void setClipToOutline(boolean clipToOutline) { 11038 damageInParent(); 11039 if (getClipToOutline() != clipToOutline) { 11040 mRenderNode.setClipToOutline(clipToOutline); 11041 } 11042 } 11043 11044 // correspond to the enum values of View_outlineProvider 11045 private static final int PROVIDER_BACKGROUND = 0; 11046 private static final int PROVIDER_NONE = 1; 11047 private static final int PROVIDER_BOUNDS = 2; 11048 private static final int PROVIDER_PADDED_BOUNDS = 3; 11049 private void setOutlineProviderFromAttribute(int providerInt) { 11050 switch (providerInt) { 11051 case PROVIDER_BACKGROUND: 11052 setOutlineProvider(ViewOutlineProvider.BACKGROUND); 11053 break; 11054 case PROVIDER_NONE: 11055 setOutlineProvider(null); 11056 break; 11057 case PROVIDER_BOUNDS: 11058 setOutlineProvider(ViewOutlineProvider.BOUNDS); 11059 break; 11060 case PROVIDER_PADDED_BOUNDS: 11061 setOutlineProvider(ViewOutlineProvider.PADDED_BOUNDS); 11062 break; 11063 } 11064 } 11065 11066 /** 11067 * Sets the {@link ViewOutlineProvider} of the view, which generates the Outline that defines 11068 * the shape of the shadow it casts, and enables outline clipping. 11069 * <p> 11070 * The default ViewOutlineProvider, {@link ViewOutlineProvider#BACKGROUND}, queries the Outline 11071 * from the View's background drawable, via {@link Drawable#getOutline(Outline)}. Changing the 11072 * outline provider with this method allows this behavior to be overridden. 11073 * <p> 11074 * If the ViewOutlineProvider is null, if querying it for an outline returns false, 11075 * or if the produced Outline is {@link Outline#isEmpty()}, shadows will not be cast. 11076 * <p> 11077 * Only outlines that return true from {@link Outline#canClip()} may be used for clipping. 11078 * 11079 * @see #setClipToOutline(boolean) 11080 * @see #getClipToOutline() 11081 * @see #getOutlineProvider() 11082 */ 11083 public void setOutlineProvider(ViewOutlineProvider provider) { 11084 mOutlineProvider = provider; 11085 invalidateOutline(); 11086 } 11087 11088 /** 11089 * Returns the current {@link ViewOutlineProvider} of the view, which generates the Outline 11090 * that defines the shape of the shadow it casts, and enables outline clipping. 11091 * 11092 * @see #setOutlineProvider(ViewOutlineProvider) 11093 */ 11094 public ViewOutlineProvider getOutlineProvider() { 11095 return mOutlineProvider; 11096 } 11097 11098 /** 11099 * Called to rebuild this View's Outline from its {@link ViewOutlineProvider outline provider} 11100 * 11101 * @see #setOutlineProvider(ViewOutlineProvider) 11102 */ 11103 public void invalidateOutline() { 11104 mPrivateFlags3 |= PFLAG3_OUTLINE_INVALID; 11105 11106 notifySubtreeAccessibilityStateChangedIfNeeded(); 11107 invalidateViewProperty(false, false); 11108 } 11109 11110 /** 11111 * Internal version of {@link #invalidateOutline()} which invalidates the 11112 * outline without invalidating the view itself. This is intended to be called from 11113 * within methods in the View class itself which are the result of the view being 11114 * invalidated already. For example, when we are drawing the background of a View, 11115 * we invalidate the outline in case it changed in the meantime, but we do not 11116 * need to invalidate the view because we're already drawing the background as part 11117 * of drawing the view in response to an earlier invalidation of the view. 11118 */ 11119 private void rebuildOutline() { 11120 // Unattached views ignore this signal, and outline is recomputed in onAttachedToWindow() 11121 if (mAttachInfo == null) return; 11122 11123 if (mOutlineProvider == null) { 11124 // no provider, remove outline 11125 mRenderNode.setOutline(null); 11126 } else { 11127 final Outline outline = mAttachInfo.mTmpOutline; 11128 outline.setEmpty(); 11129 outline.setAlpha(1.0f); 11130 11131 mOutlineProvider.getOutline(this, outline); 11132 mRenderNode.setOutline(outline); 11133 } 11134 } 11135 11136 /** 11137 * HierarchyViewer only 11138 * 11139 * @hide 11140 */ 11141 @ViewDebug.ExportedProperty(category = "drawing") 11142 public boolean hasShadow() { 11143 return mRenderNode.hasShadow(); 11144 } 11145 11146 11147 /** @hide */ 11148 public void setRevealClip(boolean shouldClip, float x, float y, float radius) { 11149 mRenderNode.setRevealClip(shouldClip, x, y, radius); 11150 invalidateViewProperty(false, false); 11151 } 11152 11153 /** 11154 * Hit rectangle in parent's coordinates 11155 * 11156 * @param outRect The hit rectangle of the view. 11157 */ 11158 public void getHitRect(Rect outRect) { 11159 if (hasIdentityMatrix() || mAttachInfo == null) { 11160 outRect.set(mLeft, mTop, mRight, mBottom); 11161 } else { 11162 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 11163 tmpRect.set(0, 0, getWidth(), getHeight()); 11164 getMatrix().mapRect(tmpRect); // TODO: mRenderNode.mapRect(tmpRect) 11165 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 11166 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 11167 } 11168 } 11169 11170 /** 11171 * Determines whether the given point, in local coordinates is inside the view. 11172 */ 11173 /*package*/ final boolean pointInView(float localX, float localY) { 11174 return localX >= 0 && localX < (mRight - mLeft) 11175 && localY >= 0 && localY < (mBottom - mTop); 11176 } 11177 11178 /** 11179 * Utility method to determine whether the given point, in local coordinates, 11180 * is inside the view, where the area of the view is expanded by the slop factor. 11181 * This method is called while processing touch-move events to determine if the event 11182 * is still within the view. 11183 * 11184 * @hide 11185 */ 11186 public boolean pointInView(float localX, float localY, float slop) { 11187 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 11188 localY < ((mBottom - mTop) + slop); 11189 } 11190 11191 /** 11192 * When a view has focus and the user navigates away from it, the next view is searched for 11193 * starting from the rectangle filled in by this method. 11194 * 11195 * By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)}) 11196 * of the view. However, if your view maintains some idea of internal selection, 11197 * such as a cursor, or a selected row or column, you should override this method and 11198 * fill in a more specific rectangle. 11199 * 11200 * @param r The rectangle to fill in, in this view's coordinates. 11201 */ 11202 public void getFocusedRect(Rect r) { 11203 getDrawingRect(r); 11204 } 11205 11206 /** 11207 * If some part of this view is not clipped by any of its parents, then 11208 * return that area in r in global (root) coordinates. To convert r to local 11209 * coordinates (without taking possible View rotations into account), offset 11210 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 11211 * If the view is completely clipped or translated out, return false. 11212 * 11213 * @param r If true is returned, r holds the global coordinates of the 11214 * visible portion of this view. 11215 * @param globalOffset If true is returned, globalOffset holds the dx,dy 11216 * between this view and its root. globalOffet may be null. 11217 * @return true if r is non-empty (i.e. part of the view is visible at the 11218 * root level. 11219 */ 11220 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 11221 int width = mRight - mLeft; 11222 int height = mBottom - mTop; 11223 if (width > 0 && height > 0) { 11224 r.set(0, 0, width, height); 11225 if (globalOffset != null) { 11226 globalOffset.set(-mScrollX, -mScrollY); 11227 } 11228 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 11229 } 11230 return false; 11231 } 11232 11233 public final boolean getGlobalVisibleRect(Rect r) { 11234 return getGlobalVisibleRect(r, null); 11235 } 11236 11237 public final boolean getLocalVisibleRect(Rect r) { 11238 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 11239 if (getGlobalVisibleRect(r, offset)) { 11240 r.offset(-offset.x, -offset.y); // make r local 11241 return true; 11242 } 11243 return false; 11244 } 11245 11246 /** 11247 * Offset this view's vertical location by the specified number of pixels. 11248 * 11249 * @param offset the number of pixels to offset the view by 11250 */ 11251 public void offsetTopAndBottom(int offset) { 11252 if (offset != 0) { 11253 final boolean matrixIsIdentity = hasIdentityMatrix(); 11254 if (matrixIsIdentity) { 11255 if (isHardwareAccelerated()) { 11256 invalidateViewProperty(false, false); 11257 } else { 11258 final ViewParent p = mParent; 11259 if (p != null && mAttachInfo != null) { 11260 final Rect r = mAttachInfo.mTmpInvalRect; 11261 int minTop; 11262 int maxBottom; 11263 int yLoc; 11264 if (offset < 0) { 11265 minTop = mTop + offset; 11266 maxBottom = mBottom; 11267 yLoc = offset; 11268 } else { 11269 minTop = mTop; 11270 maxBottom = mBottom + offset; 11271 yLoc = 0; 11272 } 11273 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 11274 p.invalidateChild(this, r); 11275 } 11276 } 11277 } else { 11278 invalidateViewProperty(false, false); 11279 } 11280 11281 mTop += offset; 11282 mBottom += offset; 11283 mRenderNode.offsetTopAndBottom(offset); 11284 if (isHardwareAccelerated()) { 11285 invalidateViewProperty(false, false); 11286 } else { 11287 if (!matrixIsIdentity) { 11288 invalidateViewProperty(false, true); 11289 } 11290 invalidateParentIfNeeded(); 11291 } 11292 notifySubtreeAccessibilityStateChangedIfNeeded(); 11293 } 11294 } 11295 11296 /** 11297 * Offset this view's horizontal location by the specified amount of pixels. 11298 * 11299 * @param offset the number of pixels to offset the view by 11300 */ 11301 public void offsetLeftAndRight(int offset) { 11302 if (offset != 0) { 11303 final boolean matrixIsIdentity = hasIdentityMatrix(); 11304 if (matrixIsIdentity) { 11305 if (isHardwareAccelerated()) { 11306 invalidateViewProperty(false, false); 11307 } else { 11308 final ViewParent p = mParent; 11309 if (p != null && mAttachInfo != null) { 11310 final Rect r = mAttachInfo.mTmpInvalRect; 11311 int minLeft; 11312 int maxRight; 11313 if (offset < 0) { 11314 minLeft = mLeft + offset; 11315 maxRight = mRight; 11316 } else { 11317 minLeft = mLeft; 11318 maxRight = mRight + offset; 11319 } 11320 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 11321 p.invalidateChild(this, r); 11322 } 11323 } 11324 } else { 11325 invalidateViewProperty(false, false); 11326 } 11327 11328 mLeft += offset; 11329 mRight += offset; 11330 mRenderNode.offsetLeftAndRight(offset); 11331 if (isHardwareAccelerated()) { 11332 invalidateViewProperty(false, false); 11333 } else { 11334 if (!matrixIsIdentity) { 11335 invalidateViewProperty(false, true); 11336 } 11337 invalidateParentIfNeeded(); 11338 } 11339 notifySubtreeAccessibilityStateChangedIfNeeded(); 11340 } 11341 } 11342 11343 /** 11344 * Get the LayoutParams associated with this view. All views should have 11345 * layout parameters. These supply parameters to the <i>parent</i> of this 11346 * view specifying how it should be arranged. There are many subclasses of 11347 * ViewGroup.LayoutParams, and these correspond to the different subclasses 11348 * of ViewGroup that are responsible for arranging their children. 11349 * 11350 * This method may return null if this View is not attached to a parent 11351 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 11352 * was not invoked successfully. When a View is attached to a parent 11353 * ViewGroup, this method must not return null. 11354 * 11355 * @return The LayoutParams associated with this view, or null if no 11356 * parameters have been set yet 11357 */ 11358 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 11359 public ViewGroup.LayoutParams getLayoutParams() { 11360 return mLayoutParams; 11361 } 11362 11363 /** 11364 * Set the layout parameters associated with this view. These supply 11365 * parameters to the <i>parent</i> of this view specifying how it should be 11366 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 11367 * correspond to the different subclasses of ViewGroup that are responsible 11368 * for arranging their children. 11369 * 11370 * @param params The layout parameters for this view, cannot be null 11371 */ 11372 public void setLayoutParams(ViewGroup.LayoutParams params) { 11373 if (params == null) { 11374 throw new NullPointerException("Layout parameters cannot be null"); 11375 } 11376 mLayoutParams = params; 11377 resolveLayoutParams(); 11378 if (mParent instanceof ViewGroup) { 11379 ((ViewGroup) mParent).onSetLayoutParams(this, params); 11380 } 11381 requestLayout(); 11382 } 11383 11384 /** 11385 * Resolve the layout parameters depending on the resolved layout direction 11386 * 11387 * @hide 11388 */ 11389 public void resolveLayoutParams() { 11390 if (mLayoutParams != null) { 11391 mLayoutParams.resolveLayoutDirection(getLayoutDirection()); 11392 } 11393 } 11394 11395 /** 11396 * Set the scrolled position of your view. This will cause a call to 11397 * {@link #onScrollChanged(int, int, int, int)} and the view will be 11398 * invalidated. 11399 * @param x the x position to scroll to 11400 * @param y the y position to scroll to 11401 */ 11402 public void scrollTo(int x, int y) { 11403 if (mScrollX != x || mScrollY != y) { 11404 int oldX = mScrollX; 11405 int oldY = mScrollY; 11406 mScrollX = x; 11407 mScrollY = y; 11408 invalidateParentCaches(); 11409 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 11410 if (!awakenScrollBars()) { 11411 postInvalidateOnAnimation(); 11412 } 11413 } 11414 } 11415 11416 /** 11417 * Move the scrolled position of your view. This will cause a call to 11418 * {@link #onScrollChanged(int, int, int, int)} and the view will be 11419 * invalidated. 11420 * @param x the amount of pixels to scroll by horizontally 11421 * @param y the amount of pixels to scroll by vertically 11422 */ 11423 public void scrollBy(int x, int y) { 11424 scrollTo(mScrollX + x, mScrollY + y); 11425 } 11426 11427 /** 11428 * <p>Trigger the scrollbars to draw. When invoked this method starts an 11429 * animation to fade the scrollbars out after a default delay. If a subclass 11430 * provides animated scrolling, the start delay should equal the duration 11431 * of the scrolling animation.</p> 11432 * 11433 * <p>The animation starts only if at least one of the scrollbars is 11434 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 11435 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 11436 * this method returns true, and false otherwise. If the animation is 11437 * started, this method calls {@link #invalidate()}; in that case the 11438 * caller should not call {@link #invalidate()}.</p> 11439 * 11440 * <p>This method should be invoked every time a subclass directly updates 11441 * the scroll parameters.</p> 11442 * 11443 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 11444 * and {@link #scrollTo(int, int)}.</p> 11445 * 11446 * @return true if the animation is played, false otherwise 11447 * 11448 * @see #awakenScrollBars(int) 11449 * @see #scrollBy(int, int) 11450 * @see #scrollTo(int, int) 11451 * @see #isHorizontalScrollBarEnabled() 11452 * @see #isVerticalScrollBarEnabled() 11453 * @see #setHorizontalScrollBarEnabled(boolean) 11454 * @see #setVerticalScrollBarEnabled(boolean) 11455 */ 11456 protected boolean awakenScrollBars() { 11457 return mScrollCache != null && 11458 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 11459 } 11460 11461 /** 11462 * Trigger the scrollbars to draw. 11463 * This method differs from awakenScrollBars() only in its default duration. 11464 * initialAwakenScrollBars() will show the scroll bars for longer than 11465 * usual to give the user more of a chance to notice them. 11466 * 11467 * @return true if the animation is played, false otherwise. 11468 */ 11469 private boolean initialAwakenScrollBars() { 11470 return mScrollCache != null && 11471 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 11472 } 11473 11474 /** 11475 * <p> 11476 * Trigger the scrollbars to draw. When invoked this method starts an 11477 * animation to fade the scrollbars out after a fixed delay. If a subclass 11478 * provides animated scrolling, the start delay should equal the duration of 11479 * the scrolling animation. 11480 * </p> 11481 * 11482 * <p> 11483 * The animation starts only if at least one of the scrollbars is enabled, 11484 * as specified by {@link #isHorizontalScrollBarEnabled()} and 11485 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 11486 * this method returns true, and false otherwise. If the animation is 11487 * started, this method calls {@link #invalidate()}; in that case the caller 11488 * should not call {@link #invalidate()}. 11489 * </p> 11490 * 11491 * <p> 11492 * This method should be invoked everytime a subclass directly updates the 11493 * scroll parameters. 11494 * </p> 11495 * 11496 * @param startDelay the delay, in milliseconds, after which the animation 11497 * should start; when the delay is 0, the animation starts 11498 * immediately 11499 * @return true if the animation is played, false otherwise 11500 * 11501 * @see #scrollBy(int, int) 11502 * @see #scrollTo(int, int) 11503 * @see #isHorizontalScrollBarEnabled() 11504 * @see #isVerticalScrollBarEnabled() 11505 * @see #setHorizontalScrollBarEnabled(boolean) 11506 * @see #setVerticalScrollBarEnabled(boolean) 11507 */ 11508 protected boolean awakenScrollBars(int startDelay) { 11509 return awakenScrollBars(startDelay, true); 11510 } 11511 11512 /** 11513 * <p> 11514 * Trigger the scrollbars to draw. When invoked this method starts an 11515 * animation to fade the scrollbars out after a fixed delay. If a subclass 11516 * provides animated scrolling, the start delay should equal the duration of 11517 * the scrolling animation. 11518 * </p> 11519 * 11520 * <p> 11521 * The animation starts only if at least one of the scrollbars is enabled, 11522 * as specified by {@link #isHorizontalScrollBarEnabled()} and 11523 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 11524 * this method returns true, and false otherwise. If the animation is 11525 * started, this method calls {@link #invalidate()} if the invalidate parameter 11526 * is set to true; in that case the caller 11527 * should not call {@link #invalidate()}. 11528 * </p> 11529 * 11530 * <p> 11531 * This method should be invoked everytime a subclass directly updates the 11532 * scroll parameters. 11533 * </p> 11534 * 11535 * @param startDelay the delay, in milliseconds, after which the animation 11536 * should start; when the delay is 0, the animation starts 11537 * immediately 11538 * 11539 * @param invalidate Wheter this method should call invalidate 11540 * 11541 * @return true if the animation is played, false otherwise 11542 * 11543 * @see #scrollBy(int, int) 11544 * @see #scrollTo(int, int) 11545 * @see #isHorizontalScrollBarEnabled() 11546 * @see #isVerticalScrollBarEnabled() 11547 * @see #setHorizontalScrollBarEnabled(boolean) 11548 * @see #setVerticalScrollBarEnabled(boolean) 11549 */ 11550 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 11551 final ScrollabilityCache scrollCache = mScrollCache; 11552 11553 if (scrollCache == null || !scrollCache.fadeScrollBars) { 11554 return false; 11555 } 11556 11557 if (scrollCache.scrollBar == null) { 11558 scrollCache.scrollBar = new ScrollBarDrawable(); 11559 } 11560 11561 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 11562 11563 if (invalidate) { 11564 // Invalidate to show the scrollbars 11565 postInvalidateOnAnimation(); 11566 } 11567 11568 if (scrollCache.state == ScrollabilityCache.OFF) { 11569 // FIXME: this is copied from WindowManagerService. 11570 // We should get this value from the system when it 11571 // is possible to do so. 11572 final int KEY_REPEAT_FIRST_DELAY = 750; 11573 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 11574 } 11575 11576 // Tell mScrollCache when we should start fading. This may 11577 // extend the fade start time if one was already scheduled 11578 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 11579 scrollCache.fadeStartTime = fadeStartTime; 11580 scrollCache.state = ScrollabilityCache.ON; 11581 11582 // Schedule our fader to run, unscheduling any old ones first 11583 if (mAttachInfo != null) { 11584 mAttachInfo.mHandler.removeCallbacks(scrollCache); 11585 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 11586 } 11587 11588 return true; 11589 } 11590 11591 return false; 11592 } 11593 11594 /** 11595 * Do not invalidate views which are not visible and which are not running an animation. They 11596 * will not get drawn and they should not set dirty flags as if they will be drawn 11597 */ 11598 private boolean skipInvalidate() { 11599 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 11600 (!(mParent instanceof ViewGroup) || 11601 !((ViewGroup) mParent).isViewTransitioning(this)); 11602 } 11603 11604 /** 11605 * Mark the area defined by dirty as needing to be drawn. If the view is 11606 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some 11607 * point in the future. 11608 * <p> 11609 * This must be called from a UI thread. To call from a non-UI thread, call 11610 * {@link #postInvalidate()}. 11611 * <p> 11612 * <b>WARNING:</b> In API 19 and below, this method may be destructive to 11613 * {@code dirty}. 11614 * 11615 * @param dirty the rectangle representing the bounds of the dirty region 11616 */ 11617 public void invalidate(Rect dirty) { 11618 final int scrollX = mScrollX; 11619 final int scrollY = mScrollY; 11620 invalidateInternal(dirty.left - scrollX, dirty.top - scrollY, 11621 dirty.right - scrollX, dirty.bottom - scrollY, true, false); 11622 } 11623 11624 /** 11625 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. The 11626 * coordinates of the dirty rect are relative to the view. If the view is 11627 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some 11628 * point in the future. 11629 * <p> 11630 * This must be called from a UI thread. To call from a non-UI thread, call 11631 * {@link #postInvalidate()}. 11632 * 11633 * @param l the left position of the dirty region 11634 * @param t the top position of the dirty region 11635 * @param r the right position of the dirty region 11636 * @param b the bottom position of the dirty region 11637 */ 11638 public void invalidate(int l, int t, int r, int b) { 11639 final int scrollX = mScrollX; 11640 final int scrollY = mScrollY; 11641 invalidateInternal(l - scrollX, t - scrollY, r - scrollX, b - scrollY, true, false); 11642 } 11643 11644 /** 11645 * Invalidate the whole view. If the view is visible, 11646 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 11647 * the future. 11648 * <p> 11649 * This must be called from a UI thread. To call from a non-UI thread, call 11650 * {@link #postInvalidate()}. 11651 */ 11652 public void invalidate() { 11653 invalidate(true); 11654 } 11655 11656 /** 11657 * This is where the invalidate() work actually happens. A full invalidate() 11658 * causes the drawing cache to be invalidated, but this function can be 11659 * called with invalidateCache set to false to skip that invalidation step 11660 * for cases that do not need it (for example, a component that remains at 11661 * the same dimensions with the same content). 11662 * 11663 * @param invalidateCache Whether the drawing cache for this view should be 11664 * invalidated as well. This is usually true for a full 11665 * invalidate, but may be set to false if the View's contents or 11666 * dimensions have not changed. 11667 */ 11668 void invalidate(boolean invalidateCache) { 11669 invalidateInternal(0, 0, mRight - mLeft, mBottom - mTop, invalidateCache, true); 11670 } 11671 11672 void invalidateInternal(int l, int t, int r, int b, boolean invalidateCache, 11673 boolean fullInvalidate) { 11674 if (mGhostView != null) { 11675 mGhostView.invalidate(invalidateCache); 11676 return; 11677 } 11678 11679 if (skipInvalidate()) { 11680 return; 11681 } 11682 11683 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) 11684 || (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) 11685 || (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED 11686 || (fullInvalidate && isOpaque() != mLastIsOpaque)) { 11687 if (fullInvalidate) { 11688 mLastIsOpaque = isOpaque(); 11689 mPrivateFlags &= ~PFLAG_DRAWN; 11690 } 11691 11692 mPrivateFlags |= PFLAG_DIRTY; 11693 11694 if (invalidateCache) { 11695 mPrivateFlags |= PFLAG_INVALIDATED; 11696 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 11697 } 11698 11699 // Propagate the damage rectangle to the parent view. 11700 final AttachInfo ai = mAttachInfo; 11701 final ViewParent p = mParent; 11702 if (p != null && ai != null && l < r && t < b) { 11703 final Rect damage = ai.mTmpInvalRect; 11704 damage.set(l, t, r, b); 11705 p.invalidateChild(this, damage); 11706 } 11707 11708 // Damage the entire projection receiver, if necessary. 11709 if (mBackground != null && mBackground.isProjected()) { 11710 final View receiver = getProjectionReceiver(); 11711 if (receiver != null) { 11712 receiver.damageInParent(); 11713 } 11714 } 11715 11716 // Damage the entire IsolatedZVolume receiving this view's shadow. 11717 if (isHardwareAccelerated() && getZ() != 0) { 11718 damageShadowReceiver(); 11719 } 11720 } 11721 } 11722 11723 /** 11724 * @return this view's projection receiver, or {@code null} if none exists 11725 */ 11726 private View getProjectionReceiver() { 11727 ViewParent p = getParent(); 11728 while (p != null && p instanceof View) { 11729 final View v = (View) p; 11730 if (v.isProjectionReceiver()) { 11731 return v; 11732 } 11733 p = p.getParent(); 11734 } 11735 11736 return null; 11737 } 11738 11739 /** 11740 * @return whether the view is a projection receiver 11741 */ 11742 private boolean isProjectionReceiver() { 11743 return mBackground != null; 11744 } 11745 11746 /** 11747 * Damage area of the screen that can be covered by this View's shadow. 11748 * 11749 * This method will guarantee that any changes to shadows cast by a View 11750 * are damaged on the screen for future redraw. 11751 */ 11752 private void damageShadowReceiver() { 11753 final AttachInfo ai = mAttachInfo; 11754 if (ai != null) { 11755 ViewParent p = getParent(); 11756 if (p != null && p instanceof ViewGroup) { 11757 final ViewGroup vg = (ViewGroup) p; 11758 vg.damageInParent(); 11759 } 11760 } 11761 } 11762 11763 /** 11764 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 11765 * set any flags or handle all of the cases handled by the default invalidation methods. 11766 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 11767 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 11768 * walk up the hierarchy, transforming the dirty rect as necessary. 11769 * 11770 * The method also handles normal invalidation logic if display list properties are not 11771 * being used in this view. The invalidateParent and forceRedraw flags are used by that 11772 * backup approach, to handle these cases used in the various property-setting methods. 11773 * 11774 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 11775 * are not being used in this view 11776 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 11777 * list properties are not being used in this view 11778 */ 11779 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 11780 if (!isHardwareAccelerated() 11781 || !mRenderNode.isValid() 11782 || (mPrivateFlags & PFLAG_DRAW_ANIMATION) != 0) { 11783 if (invalidateParent) { 11784 invalidateParentCaches(); 11785 } 11786 if (forceRedraw) { 11787 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 11788 } 11789 invalidate(false); 11790 } else { 11791 damageInParent(); 11792 } 11793 if (isHardwareAccelerated() && invalidateParent && getZ() != 0) { 11794 damageShadowReceiver(); 11795 } 11796 } 11797 11798 /** 11799 * Tells the parent view to damage this view's bounds. 11800 * 11801 * @hide 11802 */ 11803 protected void damageInParent() { 11804 final AttachInfo ai = mAttachInfo; 11805 final ViewParent p = mParent; 11806 if (p != null && ai != null) { 11807 final Rect r = ai.mTmpInvalRect; 11808 r.set(0, 0, mRight - mLeft, mBottom - mTop); 11809 if (mParent instanceof ViewGroup) { 11810 ((ViewGroup) mParent).damageChild(this, r); 11811 } else { 11812 mParent.invalidateChild(this, r); 11813 } 11814 } 11815 } 11816 11817 /** 11818 * Utility method to transform a given Rect by the current matrix of this view. 11819 */ 11820 void transformRect(final Rect rect) { 11821 if (!getMatrix().isIdentity()) { 11822 RectF boundingRect = mAttachInfo.mTmpTransformRect; 11823 boundingRect.set(rect); 11824 getMatrix().mapRect(boundingRect); 11825 rect.set((int) Math.floor(boundingRect.left), 11826 (int) Math.floor(boundingRect.top), 11827 (int) Math.ceil(boundingRect.right), 11828 (int) Math.ceil(boundingRect.bottom)); 11829 } 11830 } 11831 11832 /** 11833 * Used to indicate that the parent of this view should clear its caches. This functionality 11834 * is used to force the parent to rebuild its display list (when hardware-accelerated), 11835 * which is necessary when various parent-managed properties of the view change, such as 11836 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 11837 * clears the parent caches and does not causes an invalidate event. 11838 * 11839 * @hide 11840 */ 11841 protected void invalidateParentCaches() { 11842 if (mParent instanceof View) { 11843 ((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED; 11844 } 11845 } 11846 11847 /** 11848 * Used to indicate that the parent of this view should be invalidated. This functionality 11849 * is used to force the parent to rebuild its display list (when hardware-accelerated), 11850 * which is necessary when various parent-managed properties of the view change, such as 11851 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 11852 * an invalidation event to the parent. 11853 * 11854 * @hide 11855 */ 11856 protected void invalidateParentIfNeeded() { 11857 if (isHardwareAccelerated() && mParent instanceof View) { 11858 ((View) mParent).invalidate(true); 11859 } 11860 } 11861 11862 /** 11863 * @hide 11864 */ 11865 protected void invalidateParentIfNeededAndWasQuickRejected() { 11866 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) != 0) { 11867 // View was rejected last time it was drawn by its parent; this may have changed 11868 invalidateParentIfNeeded(); 11869 } 11870 } 11871 11872 /** 11873 * Indicates whether this View is opaque. An opaque View guarantees that it will 11874 * draw all the pixels overlapping its bounds using a fully opaque color. 11875 * 11876 * Subclasses of View should override this method whenever possible to indicate 11877 * whether an instance is opaque. Opaque Views are treated in a special way by 11878 * the View hierarchy, possibly allowing it to perform optimizations during 11879 * invalidate/draw passes. 11880 * 11881 * @return True if this View is guaranteed to be fully opaque, false otherwise. 11882 */ 11883 @ViewDebug.ExportedProperty(category = "drawing") 11884 public boolean isOpaque() { 11885 return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK && 11886 getFinalAlpha() >= 1.0f; 11887 } 11888 11889 /** 11890 * @hide 11891 */ 11892 protected void computeOpaqueFlags() { 11893 // Opaque if: 11894 // - Has a background 11895 // - Background is opaque 11896 // - Doesn't have scrollbars or scrollbars overlay 11897 11898 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 11899 mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND; 11900 } else { 11901 mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND; 11902 } 11903 11904 final int flags = mViewFlags; 11905 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 11906 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY || 11907 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_OUTSIDE_OVERLAY) { 11908 mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS; 11909 } else { 11910 mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS; 11911 } 11912 } 11913 11914 /** 11915 * @hide 11916 */ 11917 protected boolean hasOpaqueScrollbars() { 11918 return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS; 11919 } 11920 11921 /** 11922 * @return A handler associated with the thread running the View. This 11923 * handler can be used to pump events in the UI events queue. 11924 */ 11925 public Handler getHandler() { 11926 final AttachInfo attachInfo = mAttachInfo; 11927 if (attachInfo != null) { 11928 return attachInfo.mHandler; 11929 } 11930 return null; 11931 } 11932 11933 /** 11934 * Gets the view root associated with the View. 11935 * @return The view root, or null if none. 11936 * @hide 11937 */ 11938 public ViewRootImpl getViewRootImpl() { 11939 if (mAttachInfo != null) { 11940 return mAttachInfo.mViewRootImpl; 11941 } 11942 return null; 11943 } 11944 11945 /** 11946 * @hide 11947 */ 11948 public HardwareRenderer getHardwareRenderer() { 11949 return mAttachInfo != null ? mAttachInfo.mHardwareRenderer : null; 11950 } 11951 11952 /** 11953 * <p>Causes the Runnable to be added to the message queue. 11954 * The runnable will be run on the user interface thread.</p> 11955 * 11956 * @param action The Runnable that will be executed. 11957 * 11958 * @return Returns true if the Runnable was successfully placed in to the 11959 * message queue. Returns false on failure, usually because the 11960 * looper processing the message queue is exiting. 11961 * 11962 * @see #postDelayed 11963 * @see #removeCallbacks 11964 */ 11965 public boolean post(Runnable action) { 11966 final AttachInfo attachInfo = mAttachInfo; 11967 if (attachInfo != null) { 11968 return attachInfo.mHandler.post(action); 11969 } 11970 // Assume that post will succeed later 11971 ViewRootImpl.getRunQueue().post(action); 11972 return true; 11973 } 11974 11975 /** 11976 * <p>Causes the Runnable to be added to the message queue, to be run 11977 * after the specified amount of time elapses. 11978 * The runnable will be run on the user interface thread.</p> 11979 * 11980 * @param action The Runnable that will be executed. 11981 * @param delayMillis The delay (in milliseconds) until the Runnable 11982 * will be executed. 11983 * 11984 * @return true if the Runnable was successfully placed in to the 11985 * message queue. Returns false on failure, usually because the 11986 * looper processing the message queue is exiting. Note that a 11987 * result of true does not mean the Runnable will be processed -- 11988 * if the looper is quit before the delivery time of the message 11989 * occurs then the message will be dropped. 11990 * 11991 * @see #post 11992 * @see #removeCallbacks 11993 */ 11994 public boolean postDelayed(Runnable action, long delayMillis) { 11995 final AttachInfo attachInfo = mAttachInfo; 11996 if (attachInfo != null) { 11997 return attachInfo.mHandler.postDelayed(action, delayMillis); 11998 } 11999 // Assume that post will succeed later 12000 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 12001 return true; 12002 } 12003 12004 /** 12005 * <p>Causes the Runnable to execute on the next animation time step. 12006 * The runnable will be run on the user interface thread.</p> 12007 * 12008 * @param action The Runnable that will be executed. 12009 * 12010 * @see #postOnAnimationDelayed 12011 * @see #removeCallbacks 12012 */ 12013 public void postOnAnimation(Runnable action) { 12014 final AttachInfo attachInfo = mAttachInfo; 12015 if (attachInfo != null) { 12016 attachInfo.mViewRootImpl.mChoreographer.postCallback( 12017 Choreographer.CALLBACK_ANIMATION, action, null); 12018 } else { 12019 // Assume that post will succeed later 12020 ViewRootImpl.getRunQueue().post(action); 12021 } 12022 } 12023 12024 /** 12025 * <p>Causes the Runnable to execute on the next animation time step, 12026 * after the specified amount of time elapses. 12027 * The runnable will be run on the user interface thread.</p> 12028 * 12029 * @param action The Runnable that will be executed. 12030 * @param delayMillis The delay (in milliseconds) until the Runnable 12031 * will be executed. 12032 * 12033 * @see #postOnAnimation 12034 * @see #removeCallbacks 12035 */ 12036 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 12037 final AttachInfo attachInfo = mAttachInfo; 12038 if (attachInfo != null) { 12039 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 12040 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 12041 } else { 12042 // Assume that post will succeed later 12043 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 12044 } 12045 } 12046 12047 /** 12048 * <p>Removes the specified Runnable from the message queue.</p> 12049 * 12050 * @param action The Runnable to remove from the message handling queue 12051 * 12052 * @return true if this view could ask the Handler to remove the Runnable, 12053 * false otherwise. When the returned value is true, the Runnable 12054 * may or may not have been actually removed from the message queue 12055 * (for instance, if the Runnable was not in the queue already.) 12056 * 12057 * @see #post 12058 * @see #postDelayed 12059 * @see #postOnAnimation 12060 * @see #postOnAnimationDelayed 12061 */ 12062 public boolean removeCallbacks(Runnable action) { 12063 if (action != null) { 12064 final AttachInfo attachInfo = mAttachInfo; 12065 if (attachInfo != null) { 12066 attachInfo.mHandler.removeCallbacks(action); 12067 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 12068 Choreographer.CALLBACK_ANIMATION, action, null); 12069 } 12070 // Assume that post will succeed later 12071 ViewRootImpl.getRunQueue().removeCallbacks(action); 12072 } 12073 return true; 12074 } 12075 12076 /** 12077 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 12078 * Use this to invalidate the View from a non-UI thread.</p> 12079 * 12080 * <p>This method can be invoked from outside of the UI thread 12081 * only when this View is attached to a window.</p> 12082 * 12083 * @see #invalidate() 12084 * @see #postInvalidateDelayed(long) 12085 */ 12086 public void postInvalidate() { 12087 postInvalidateDelayed(0); 12088 } 12089 12090 /** 12091 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 12092 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 12093 * 12094 * <p>This method can be invoked from outside of the UI thread 12095 * only when this View is attached to a window.</p> 12096 * 12097 * @param left The left coordinate of the rectangle to invalidate. 12098 * @param top The top coordinate of the rectangle to invalidate. 12099 * @param right The right coordinate of the rectangle to invalidate. 12100 * @param bottom The bottom coordinate of the rectangle to invalidate. 12101 * 12102 * @see #invalidate(int, int, int, int) 12103 * @see #invalidate(Rect) 12104 * @see #postInvalidateDelayed(long, int, int, int, int) 12105 */ 12106 public void postInvalidate(int left, int top, int right, int bottom) { 12107 postInvalidateDelayed(0, left, top, right, bottom); 12108 } 12109 12110 /** 12111 * <p>Cause an invalidate to happen on a subsequent cycle through the event 12112 * loop. Waits for the specified amount of time.</p> 12113 * 12114 * <p>This method can be invoked from outside of the UI thread 12115 * only when this View is attached to a window.</p> 12116 * 12117 * @param delayMilliseconds the duration in milliseconds to delay the 12118 * invalidation by 12119 * 12120 * @see #invalidate() 12121 * @see #postInvalidate() 12122 */ 12123 public void postInvalidateDelayed(long delayMilliseconds) { 12124 // We try only with the AttachInfo because there's no point in invalidating 12125 // if we are not attached to our window 12126 final AttachInfo attachInfo = mAttachInfo; 12127 if (attachInfo != null) { 12128 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 12129 } 12130 } 12131 12132 /** 12133 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 12134 * through the event loop. Waits for the specified amount of time.</p> 12135 * 12136 * <p>This method can be invoked from outside of the UI thread 12137 * only when this View is attached to a window.</p> 12138 * 12139 * @param delayMilliseconds the duration in milliseconds to delay the 12140 * invalidation by 12141 * @param left The left coordinate of the rectangle to invalidate. 12142 * @param top The top coordinate of the rectangle to invalidate. 12143 * @param right The right coordinate of the rectangle to invalidate. 12144 * @param bottom The bottom coordinate of the rectangle to invalidate. 12145 * 12146 * @see #invalidate(int, int, int, int) 12147 * @see #invalidate(Rect) 12148 * @see #postInvalidate(int, int, int, int) 12149 */ 12150 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 12151 int right, int bottom) { 12152 12153 // We try only with the AttachInfo because there's no point in invalidating 12154 // if we are not attached to our window 12155 final AttachInfo attachInfo = mAttachInfo; 12156 if (attachInfo != null) { 12157 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 12158 info.target = this; 12159 info.left = left; 12160 info.top = top; 12161 info.right = right; 12162 info.bottom = bottom; 12163 12164 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 12165 } 12166 } 12167 12168 /** 12169 * <p>Cause an invalidate to happen on the next animation time step, typically the 12170 * next display frame.</p> 12171 * 12172 * <p>This method can be invoked from outside of the UI thread 12173 * only when this View is attached to a window.</p> 12174 * 12175 * @see #invalidate() 12176 */ 12177 public void postInvalidateOnAnimation() { 12178 // We try only with the AttachInfo because there's no point in invalidating 12179 // if we are not attached to our window 12180 final AttachInfo attachInfo = mAttachInfo; 12181 if (attachInfo != null) { 12182 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 12183 } 12184 } 12185 12186 /** 12187 * <p>Cause an invalidate of the specified area to happen on the next animation 12188 * time step, typically the next display frame.</p> 12189 * 12190 * <p>This method can be invoked from outside of the UI thread 12191 * only when this View is attached to a window.</p> 12192 * 12193 * @param left The left coordinate of the rectangle to invalidate. 12194 * @param top The top coordinate of the rectangle to invalidate. 12195 * @param right The right coordinate of the rectangle to invalidate. 12196 * @param bottom The bottom coordinate of the rectangle to invalidate. 12197 * 12198 * @see #invalidate(int, int, int, int) 12199 * @see #invalidate(Rect) 12200 */ 12201 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 12202 // We try only with the AttachInfo because there's no point in invalidating 12203 // if we are not attached to our window 12204 final AttachInfo attachInfo = mAttachInfo; 12205 if (attachInfo != null) { 12206 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 12207 info.target = this; 12208 info.left = left; 12209 info.top = top; 12210 info.right = right; 12211 info.bottom = bottom; 12212 12213 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 12214 } 12215 } 12216 12217 /** 12218 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 12219 * This event is sent at most once every 12220 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 12221 */ 12222 private void postSendViewScrolledAccessibilityEventCallback() { 12223 if (mSendViewScrolledAccessibilityEvent == null) { 12224 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 12225 } 12226 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 12227 mSendViewScrolledAccessibilityEvent.mIsPending = true; 12228 postDelayed(mSendViewScrolledAccessibilityEvent, 12229 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 12230 } 12231 } 12232 12233 /** 12234 * Called by a parent to request that a child update its values for mScrollX 12235 * and mScrollY if necessary. This will typically be done if the child is 12236 * animating a scroll using a {@link android.widget.Scroller Scroller} 12237 * object. 12238 */ 12239 public void computeScroll() { 12240 } 12241 12242 /** 12243 * <p>Indicate whether the horizontal edges are faded when the view is 12244 * scrolled horizontally.</p> 12245 * 12246 * @return true if the horizontal edges should are faded on scroll, false 12247 * otherwise 12248 * 12249 * @see #setHorizontalFadingEdgeEnabled(boolean) 12250 * 12251 * @attr ref android.R.styleable#View_requiresFadingEdge 12252 */ 12253 public boolean isHorizontalFadingEdgeEnabled() { 12254 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 12255 } 12256 12257 /** 12258 * <p>Define whether the horizontal edges should be faded when this view 12259 * is scrolled horizontally.</p> 12260 * 12261 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 12262 * be faded when the view is scrolled 12263 * horizontally 12264 * 12265 * @see #isHorizontalFadingEdgeEnabled() 12266 * 12267 * @attr ref android.R.styleable#View_requiresFadingEdge 12268 */ 12269 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 12270 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 12271 if (horizontalFadingEdgeEnabled) { 12272 initScrollCache(); 12273 } 12274 12275 mViewFlags ^= FADING_EDGE_HORIZONTAL; 12276 } 12277 } 12278 12279 /** 12280 * <p>Indicate whether the vertical edges are faded when the view is 12281 * scrolled horizontally.</p> 12282 * 12283 * @return true if the vertical edges should are faded on scroll, false 12284 * otherwise 12285 * 12286 * @see #setVerticalFadingEdgeEnabled(boolean) 12287 * 12288 * @attr ref android.R.styleable#View_requiresFadingEdge 12289 */ 12290 public boolean isVerticalFadingEdgeEnabled() { 12291 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 12292 } 12293 12294 /** 12295 * <p>Define whether the vertical edges should be faded when this view 12296 * is scrolled vertically.</p> 12297 * 12298 * @param verticalFadingEdgeEnabled true if the vertical edges should 12299 * be faded when the view is scrolled 12300 * vertically 12301 * 12302 * @see #isVerticalFadingEdgeEnabled() 12303 * 12304 * @attr ref android.R.styleable#View_requiresFadingEdge 12305 */ 12306 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 12307 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 12308 if (verticalFadingEdgeEnabled) { 12309 initScrollCache(); 12310 } 12311 12312 mViewFlags ^= FADING_EDGE_VERTICAL; 12313 } 12314 } 12315 12316 /** 12317 * Returns the strength, or intensity, of the top faded edge. The strength is 12318 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 12319 * returns 0.0 or 1.0 but no value in between. 12320 * 12321 * Subclasses should override this method to provide a smoother fade transition 12322 * when scrolling occurs. 12323 * 12324 * @return the intensity of the top fade as a float between 0.0f and 1.0f 12325 */ 12326 protected float getTopFadingEdgeStrength() { 12327 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 12328 } 12329 12330 /** 12331 * Returns the strength, or intensity, of the bottom faded edge. The strength is 12332 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 12333 * returns 0.0 or 1.0 but no value in between. 12334 * 12335 * Subclasses should override this method to provide a smoother fade transition 12336 * when scrolling occurs. 12337 * 12338 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 12339 */ 12340 protected float getBottomFadingEdgeStrength() { 12341 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 12342 computeVerticalScrollRange() ? 1.0f : 0.0f; 12343 } 12344 12345 /** 12346 * Returns the strength, or intensity, of the left faded edge. The strength is 12347 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 12348 * returns 0.0 or 1.0 but no value in between. 12349 * 12350 * Subclasses should override this method to provide a smoother fade transition 12351 * when scrolling occurs. 12352 * 12353 * @return the intensity of the left fade as a float between 0.0f and 1.0f 12354 */ 12355 protected float getLeftFadingEdgeStrength() { 12356 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 12357 } 12358 12359 /** 12360 * Returns the strength, or intensity, of the right faded edge. The strength is 12361 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 12362 * returns 0.0 or 1.0 but no value in between. 12363 * 12364 * Subclasses should override this method to provide a smoother fade transition 12365 * when scrolling occurs. 12366 * 12367 * @return the intensity of the right fade as a float between 0.0f and 1.0f 12368 */ 12369 protected float getRightFadingEdgeStrength() { 12370 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 12371 computeHorizontalScrollRange() ? 1.0f : 0.0f; 12372 } 12373 12374 /** 12375 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 12376 * scrollbar is not drawn by default.</p> 12377 * 12378 * @return true if the horizontal scrollbar should be painted, false 12379 * otherwise 12380 * 12381 * @see #setHorizontalScrollBarEnabled(boolean) 12382 */ 12383 public boolean isHorizontalScrollBarEnabled() { 12384 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 12385 } 12386 12387 /** 12388 * <p>Define whether the horizontal scrollbar should be drawn or not. The 12389 * scrollbar is not drawn by default.</p> 12390 * 12391 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 12392 * be painted 12393 * 12394 * @see #isHorizontalScrollBarEnabled() 12395 */ 12396 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 12397 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 12398 mViewFlags ^= SCROLLBARS_HORIZONTAL; 12399 computeOpaqueFlags(); 12400 resolvePadding(); 12401 } 12402 } 12403 12404 /** 12405 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 12406 * scrollbar is not drawn by default.</p> 12407 * 12408 * @return true if the vertical scrollbar should be painted, false 12409 * otherwise 12410 * 12411 * @see #setVerticalScrollBarEnabled(boolean) 12412 */ 12413 public boolean isVerticalScrollBarEnabled() { 12414 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 12415 } 12416 12417 /** 12418 * <p>Define whether the vertical scrollbar should be drawn or not. The 12419 * scrollbar is not drawn by default.</p> 12420 * 12421 * @param verticalScrollBarEnabled true if the vertical scrollbar should 12422 * be painted 12423 * 12424 * @see #isVerticalScrollBarEnabled() 12425 */ 12426 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 12427 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 12428 mViewFlags ^= SCROLLBARS_VERTICAL; 12429 computeOpaqueFlags(); 12430 resolvePadding(); 12431 } 12432 } 12433 12434 /** 12435 * @hide 12436 */ 12437 protected void recomputePadding() { 12438 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 12439 } 12440 12441 /** 12442 * Define whether scrollbars will fade when the view is not scrolling. 12443 * 12444 * @param fadeScrollbars wheter to enable fading 12445 * 12446 * @attr ref android.R.styleable#View_fadeScrollbars 12447 */ 12448 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 12449 initScrollCache(); 12450 final ScrollabilityCache scrollabilityCache = mScrollCache; 12451 scrollabilityCache.fadeScrollBars = fadeScrollbars; 12452 if (fadeScrollbars) { 12453 scrollabilityCache.state = ScrollabilityCache.OFF; 12454 } else { 12455 scrollabilityCache.state = ScrollabilityCache.ON; 12456 } 12457 } 12458 12459 /** 12460 * 12461 * Returns true if scrollbars will fade when this view is not scrolling 12462 * 12463 * @return true if scrollbar fading is enabled 12464 * 12465 * @attr ref android.R.styleable#View_fadeScrollbars 12466 */ 12467 public boolean isScrollbarFadingEnabled() { 12468 return mScrollCache != null && mScrollCache.fadeScrollBars; 12469 } 12470 12471 /** 12472 * 12473 * Returns the delay before scrollbars fade. 12474 * 12475 * @return the delay before scrollbars fade 12476 * 12477 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 12478 */ 12479 public int getScrollBarDefaultDelayBeforeFade() { 12480 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 12481 mScrollCache.scrollBarDefaultDelayBeforeFade; 12482 } 12483 12484 /** 12485 * Define the delay before scrollbars fade. 12486 * 12487 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 12488 * 12489 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 12490 */ 12491 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 12492 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 12493 } 12494 12495 /** 12496 * 12497 * Returns the scrollbar fade duration. 12498 * 12499 * @return the scrollbar fade duration 12500 * 12501 * @attr ref android.R.styleable#View_scrollbarFadeDuration 12502 */ 12503 public int getScrollBarFadeDuration() { 12504 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 12505 mScrollCache.scrollBarFadeDuration; 12506 } 12507 12508 /** 12509 * Define the scrollbar fade duration. 12510 * 12511 * @param scrollBarFadeDuration - the scrollbar fade duration 12512 * 12513 * @attr ref android.R.styleable#View_scrollbarFadeDuration 12514 */ 12515 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 12516 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 12517 } 12518 12519 /** 12520 * 12521 * Returns the scrollbar size. 12522 * 12523 * @return the scrollbar size 12524 * 12525 * @attr ref android.R.styleable#View_scrollbarSize 12526 */ 12527 public int getScrollBarSize() { 12528 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 12529 mScrollCache.scrollBarSize; 12530 } 12531 12532 /** 12533 * Define the scrollbar size. 12534 * 12535 * @param scrollBarSize - the scrollbar size 12536 * 12537 * @attr ref android.R.styleable#View_scrollbarSize 12538 */ 12539 public void setScrollBarSize(int scrollBarSize) { 12540 getScrollCache().scrollBarSize = scrollBarSize; 12541 } 12542 12543 /** 12544 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 12545 * inset. When inset, they add to the padding of the view. And the scrollbars 12546 * can be drawn inside the padding area or on the edge of the view. For example, 12547 * if a view has a background drawable and you want to draw the scrollbars 12548 * inside the padding specified by the drawable, you can use 12549 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 12550 * appear at the edge of the view, ignoring the padding, then you can use 12551 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 12552 * @param style the style of the scrollbars. Should be one of 12553 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 12554 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 12555 * @see #SCROLLBARS_INSIDE_OVERLAY 12556 * @see #SCROLLBARS_INSIDE_INSET 12557 * @see #SCROLLBARS_OUTSIDE_OVERLAY 12558 * @see #SCROLLBARS_OUTSIDE_INSET 12559 * 12560 * @attr ref android.R.styleable#View_scrollbarStyle 12561 */ 12562 public void setScrollBarStyle(@ScrollBarStyle int style) { 12563 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 12564 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 12565 computeOpaqueFlags(); 12566 resolvePadding(); 12567 } 12568 } 12569 12570 /** 12571 * <p>Returns the current scrollbar style.</p> 12572 * @return the current scrollbar style 12573 * @see #SCROLLBARS_INSIDE_OVERLAY 12574 * @see #SCROLLBARS_INSIDE_INSET 12575 * @see #SCROLLBARS_OUTSIDE_OVERLAY 12576 * @see #SCROLLBARS_OUTSIDE_INSET 12577 * 12578 * @attr ref android.R.styleable#View_scrollbarStyle 12579 */ 12580 @ViewDebug.ExportedProperty(mapping = { 12581 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 12582 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 12583 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 12584 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 12585 }) 12586 @ScrollBarStyle 12587 public int getScrollBarStyle() { 12588 return mViewFlags & SCROLLBARS_STYLE_MASK; 12589 } 12590 12591 /** 12592 * <p>Compute the horizontal range that the horizontal scrollbar 12593 * represents.</p> 12594 * 12595 * <p>The range is expressed in arbitrary units that must be the same as the 12596 * units used by {@link #computeHorizontalScrollExtent()} and 12597 * {@link #computeHorizontalScrollOffset()}.</p> 12598 * 12599 * <p>The default range is the drawing width of this view.</p> 12600 * 12601 * @return the total horizontal range represented by the horizontal 12602 * scrollbar 12603 * 12604 * @see #computeHorizontalScrollExtent() 12605 * @see #computeHorizontalScrollOffset() 12606 * @see android.widget.ScrollBarDrawable 12607 */ 12608 protected int computeHorizontalScrollRange() { 12609 return getWidth(); 12610 } 12611 12612 /** 12613 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 12614 * within the horizontal range. This value is used to compute the position 12615 * of the thumb within the scrollbar's track.</p> 12616 * 12617 * <p>The range is expressed in arbitrary units that must be the same as the 12618 * units used by {@link #computeHorizontalScrollRange()} and 12619 * {@link #computeHorizontalScrollExtent()}.</p> 12620 * 12621 * <p>The default offset is the scroll offset of this view.</p> 12622 * 12623 * @return the horizontal offset of the scrollbar's thumb 12624 * 12625 * @see #computeHorizontalScrollRange() 12626 * @see #computeHorizontalScrollExtent() 12627 * @see android.widget.ScrollBarDrawable 12628 */ 12629 protected int computeHorizontalScrollOffset() { 12630 return mScrollX; 12631 } 12632 12633 /** 12634 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 12635 * within the horizontal range. This value is used to compute the length 12636 * of the thumb within the scrollbar's track.</p> 12637 * 12638 * <p>The range is expressed in arbitrary units that must be the same as the 12639 * units used by {@link #computeHorizontalScrollRange()} and 12640 * {@link #computeHorizontalScrollOffset()}.</p> 12641 * 12642 * <p>The default extent is the drawing width of this view.</p> 12643 * 12644 * @return the horizontal extent of the scrollbar's thumb 12645 * 12646 * @see #computeHorizontalScrollRange() 12647 * @see #computeHorizontalScrollOffset() 12648 * @see android.widget.ScrollBarDrawable 12649 */ 12650 protected int computeHorizontalScrollExtent() { 12651 return getWidth(); 12652 } 12653 12654 /** 12655 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 12656 * 12657 * <p>The range is expressed in arbitrary units that must be the same as the 12658 * units used by {@link #computeVerticalScrollExtent()} and 12659 * {@link #computeVerticalScrollOffset()}.</p> 12660 * 12661 * @return the total vertical range represented by the vertical scrollbar 12662 * 12663 * <p>The default range is the drawing height of this view.</p> 12664 * 12665 * @see #computeVerticalScrollExtent() 12666 * @see #computeVerticalScrollOffset() 12667 * @see android.widget.ScrollBarDrawable 12668 */ 12669 protected int computeVerticalScrollRange() { 12670 return getHeight(); 12671 } 12672 12673 /** 12674 * <p>Compute the vertical offset of the vertical scrollbar's thumb 12675 * within the horizontal range. This value is used to compute the position 12676 * of the thumb within the scrollbar's track.</p> 12677 * 12678 * <p>The range is expressed in arbitrary units that must be the same as the 12679 * units used by {@link #computeVerticalScrollRange()} and 12680 * {@link #computeVerticalScrollExtent()}.</p> 12681 * 12682 * <p>The default offset is the scroll offset of this view.</p> 12683 * 12684 * @return the vertical offset of the scrollbar's thumb 12685 * 12686 * @see #computeVerticalScrollRange() 12687 * @see #computeVerticalScrollExtent() 12688 * @see android.widget.ScrollBarDrawable 12689 */ 12690 protected int computeVerticalScrollOffset() { 12691 return mScrollY; 12692 } 12693 12694 /** 12695 * <p>Compute the vertical extent of the vertical scrollbar's thumb 12696 * within the vertical range. This value is used to compute the length 12697 * of the thumb within the scrollbar's track.</p> 12698 * 12699 * <p>The range is expressed in arbitrary units that must be the same as the 12700 * units used by {@link #computeVerticalScrollRange()} and 12701 * {@link #computeVerticalScrollOffset()}.</p> 12702 * 12703 * <p>The default extent is the drawing height of this view.</p> 12704 * 12705 * @return the vertical extent of the scrollbar's thumb 12706 * 12707 * @see #computeVerticalScrollRange() 12708 * @see #computeVerticalScrollOffset() 12709 * @see android.widget.ScrollBarDrawable 12710 */ 12711 protected int computeVerticalScrollExtent() { 12712 return getHeight(); 12713 } 12714 12715 /** 12716 * Check if this view can be scrolled horizontally in a certain direction. 12717 * 12718 * @param direction Negative to check scrolling left, positive to check scrolling right. 12719 * @return true if this view can be scrolled in the specified direction, false otherwise. 12720 */ 12721 public boolean canScrollHorizontally(int direction) { 12722 final int offset = computeHorizontalScrollOffset(); 12723 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 12724 if (range == 0) return false; 12725 if (direction < 0) { 12726 return offset > 0; 12727 } else { 12728 return offset < range - 1; 12729 } 12730 } 12731 12732 /** 12733 * Check if this view can be scrolled vertically in a certain direction. 12734 * 12735 * @param direction Negative to check scrolling up, positive to check scrolling down. 12736 * @return true if this view can be scrolled in the specified direction, false otherwise. 12737 */ 12738 public boolean canScrollVertically(int direction) { 12739 final int offset = computeVerticalScrollOffset(); 12740 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 12741 if (range == 0) return false; 12742 if (direction < 0) { 12743 return offset > 0; 12744 } else { 12745 return offset < range - 1; 12746 } 12747 } 12748 12749 /** 12750 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 12751 * scrollbars are painted only if they have been awakened first.</p> 12752 * 12753 * @param canvas the canvas on which to draw the scrollbars 12754 * 12755 * @see #awakenScrollBars(int) 12756 */ 12757 protected final void onDrawScrollBars(Canvas canvas) { 12758 // scrollbars are drawn only when the animation is running 12759 final ScrollabilityCache cache = mScrollCache; 12760 if (cache != null) { 12761 12762 int state = cache.state; 12763 12764 if (state == ScrollabilityCache.OFF) { 12765 return; 12766 } 12767 12768 boolean invalidate = false; 12769 12770 if (state == ScrollabilityCache.FADING) { 12771 // We're fading -- get our fade interpolation 12772 if (cache.interpolatorValues == null) { 12773 cache.interpolatorValues = new float[1]; 12774 } 12775 12776 float[] values = cache.interpolatorValues; 12777 12778 // Stops the animation if we're done 12779 if (cache.scrollBarInterpolator.timeToValues(values) == 12780 Interpolator.Result.FREEZE_END) { 12781 cache.state = ScrollabilityCache.OFF; 12782 } else { 12783 cache.scrollBar.setAlpha(Math.round(values[0])); 12784 } 12785 12786 // This will make the scroll bars inval themselves after 12787 // drawing. We only want this when we're fading so that 12788 // we prevent excessive redraws 12789 invalidate = true; 12790 } else { 12791 // We're just on -- but we may have been fading before so 12792 // reset alpha 12793 cache.scrollBar.setAlpha(255); 12794 } 12795 12796 12797 final int viewFlags = mViewFlags; 12798 12799 final boolean drawHorizontalScrollBar = 12800 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 12801 final boolean drawVerticalScrollBar = 12802 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 12803 && !isVerticalScrollBarHidden(); 12804 12805 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 12806 final int width = mRight - mLeft; 12807 final int height = mBottom - mTop; 12808 12809 final ScrollBarDrawable scrollBar = cache.scrollBar; 12810 12811 final int scrollX = mScrollX; 12812 final int scrollY = mScrollY; 12813 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 12814 12815 int left; 12816 int top; 12817 int right; 12818 int bottom; 12819 12820 if (drawHorizontalScrollBar) { 12821 int size = scrollBar.getSize(false); 12822 if (size <= 0) { 12823 size = cache.scrollBarSize; 12824 } 12825 12826 scrollBar.setParameters(computeHorizontalScrollRange(), 12827 computeHorizontalScrollOffset(), 12828 computeHorizontalScrollExtent(), false); 12829 final int verticalScrollBarGap = drawVerticalScrollBar ? 12830 getVerticalScrollbarWidth() : 0; 12831 top = scrollY + height - size - (mUserPaddingBottom & inside); 12832 left = scrollX + (mPaddingLeft & inside); 12833 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 12834 bottom = top + size; 12835 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 12836 if (invalidate) { 12837 invalidate(left, top, right, bottom); 12838 } 12839 } 12840 12841 if (drawVerticalScrollBar) { 12842 int size = scrollBar.getSize(true); 12843 if (size <= 0) { 12844 size = cache.scrollBarSize; 12845 } 12846 12847 scrollBar.setParameters(computeVerticalScrollRange(), 12848 computeVerticalScrollOffset(), 12849 computeVerticalScrollExtent(), true); 12850 int verticalScrollbarPosition = mVerticalScrollbarPosition; 12851 if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) { 12852 verticalScrollbarPosition = isLayoutRtl() ? 12853 SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT; 12854 } 12855 switch (verticalScrollbarPosition) { 12856 default: 12857 case SCROLLBAR_POSITION_RIGHT: 12858 left = scrollX + width - size - (mUserPaddingRight & inside); 12859 break; 12860 case SCROLLBAR_POSITION_LEFT: 12861 left = scrollX + (mUserPaddingLeft & inside); 12862 break; 12863 } 12864 top = scrollY + (mPaddingTop & inside); 12865 right = left + size; 12866 bottom = scrollY + height - (mUserPaddingBottom & inside); 12867 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 12868 if (invalidate) { 12869 invalidate(left, top, right, bottom); 12870 } 12871 } 12872 } 12873 } 12874 } 12875 12876 /** 12877 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 12878 * FastScroller is visible. 12879 * @return whether to temporarily hide the vertical scrollbar 12880 * @hide 12881 */ 12882 protected boolean isVerticalScrollBarHidden() { 12883 return false; 12884 } 12885 12886 /** 12887 * <p>Draw the horizontal scrollbar if 12888 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 12889 * 12890 * @param canvas the canvas on which to draw the scrollbar 12891 * @param scrollBar the scrollbar's drawable 12892 * 12893 * @see #isHorizontalScrollBarEnabled() 12894 * @see #computeHorizontalScrollRange() 12895 * @see #computeHorizontalScrollExtent() 12896 * @see #computeHorizontalScrollOffset() 12897 * @see android.widget.ScrollBarDrawable 12898 * @hide 12899 */ 12900 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 12901 int l, int t, int r, int b) { 12902 scrollBar.setBounds(l, t, r, b); 12903 scrollBar.draw(canvas); 12904 } 12905 12906 /** 12907 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 12908 * returns true.</p> 12909 * 12910 * @param canvas the canvas on which to draw the scrollbar 12911 * @param scrollBar the scrollbar's drawable 12912 * 12913 * @see #isVerticalScrollBarEnabled() 12914 * @see #computeVerticalScrollRange() 12915 * @see #computeVerticalScrollExtent() 12916 * @see #computeVerticalScrollOffset() 12917 * @see android.widget.ScrollBarDrawable 12918 * @hide 12919 */ 12920 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 12921 int l, int t, int r, int b) { 12922 scrollBar.setBounds(l, t, r, b); 12923 scrollBar.draw(canvas); 12924 } 12925 12926 /** 12927 * Implement this to do your drawing. 12928 * 12929 * @param canvas the canvas on which the background will be drawn 12930 */ 12931 protected void onDraw(Canvas canvas) { 12932 } 12933 12934 /* 12935 * Caller is responsible for calling requestLayout if necessary. 12936 * (This allows addViewInLayout to not request a new layout.) 12937 */ 12938 void assignParent(ViewParent parent) { 12939 if (mParent == null) { 12940 mParent = parent; 12941 } else if (parent == null) { 12942 mParent = null; 12943 } else { 12944 throw new RuntimeException("view " + this + " being added, but" 12945 + " it already has a parent"); 12946 } 12947 } 12948 12949 /** 12950 * This is called when the view is attached to a window. At this point it 12951 * has a Surface and will start drawing. Note that this function is 12952 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 12953 * however it may be called any time before the first onDraw -- including 12954 * before or after {@link #onMeasure(int, int)}. 12955 * 12956 * @see #onDetachedFromWindow() 12957 */ 12958 protected void onAttachedToWindow() { 12959 if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) { 12960 mParent.requestTransparentRegion(this); 12961 } 12962 12963 if ((mPrivateFlags & PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 12964 initialAwakenScrollBars(); 12965 mPrivateFlags &= ~PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 12966 } 12967 12968 mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; 12969 12970 jumpDrawablesToCurrentState(); 12971 12972 resetSubtreeAccessibilityStateChanged(); 12973 12974 // rebuild, since Outline not maintained while View is detached 12975 rebuildOutline(); 12976 12977 if (isFocused()) { 12978 InputMethodManager imm = InputMethodManager.peekInstance(); 12979 imm.focusIn(this); 12980 } 12981 } 12982 12983 /** 12984 * Resolve all RTL related properties. 12985 * 12986 * @return true if resolution of RTL properties has been done 12987 * 12988 * @hide 12989 */ 12990 public boolean resolveRtlPropertiesIfNeeded() { 12991 if (!needRtlPropertiesResolution()) return false; 12992 12993 // Order is important here: LayoutDirection MUST be resolved first 12994 if (!isLayoutDirectionResolved()) { 12995 resolveLayoutDirection(); 12996 resolveLayoutParams(); 12997 } 12998 // ... then we can resolve the others properties depending on the resolved LayoutDirection. 12999 if (!isTextDirectionResolved()) { 13000 resolveTextDirection(); 13001 } 13002 if (!isTextAlignmentResolved()) { 13003 resolveTextAlignment(); 13004 } 13005 // Should resolve Drawables before Padding because we need the layout direction of the 13006 // Drawable to correctly resolve Padding. 13007 if (!isDrawablesResolved()) { 13008 resolveDrawables(); 13009 } 13010 if (!isPaddingResolved()) { 13011 resolvePadding(); 13012 } 13013 onRtlPropertiesChanged(getLayoutDirection()); 13014 return true; 13015 } 13016 13017 /** 13018 * Reset resolution of all RTL related properties. 13019 * 13020 * @hide 13021 */ 13022 public void resetRtlProperties() { 13023 resetResolvedLayoutDirection(); 13024 resetResolvedTextDirection(); 13025 resetResolvedTextAlignment(); 13026 resetResolvedPadding(); 13027 resetResolvedDrawables(); 13028 } 13029 13030 /** 13031 * @see #onScreenStateChanged(int) 13032 */ 13033 void dispatchScreenStateChanged(int screenState) { 13034 onScreenStateChanged(screenState); 13035 } 13036 13037 /** 13038 * This method is called whenever the state of the screen this view is 13039 * attached to changes. A state change will usually occurs when the screen 13040 * turns on or off (whether it happens automatically or the user does it 13041 * manually.) 13042 * 13043 * @param screenState The new state of the screen. Can be either 13044 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 13045 */ 13046 public void onScreenStateChanged(int screenState) { 13047 } 13048 13049 /** 13050 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 13051 */ 13052 private boolean hasRtlSupport() { 13053 return mContext.getApplicationInfo().hasRtlSupport(); 13054 } 13055 13056 /** 13057 * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or 13058 * RTL not supported) 13059 */ 13060 private boolean isRtlCompatibilityMode() { 13061 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 13062 return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport(); 13063 } 13064 13065 /** 13066 * @return true if RTL properties need resolution. 13067 * 13068 */ 13069 private boolean needRtlPropertiesResolution() { 13070 return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED; 13071 } 13072 13073 /** 13074 * Called when any RTL property (layout direction or text direction or text alignment) has 13075 * been changed. 13076 * 13077 * Subclasses need to override this method to take care of cached information that depends on the 13078 * resolved layout direction, or to inform child views that inherit their layout direction. 13079 * 13080 * The default implementation does nothing. 13081 * 13082 * @param layoutDirection the direction of the layout 13083 * 13084 * @see #LAYOUT_DIRECTION_LTR 13085 * @see #LAYOUT_DIRECTION_RTL 13086 */ 13087 public void onRtlPropertiesChanged(@ResolvedLayoutDir int layoutDirection) { 13088 } 13089 13090 /** 13091 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 13092 * that the parent directionality can and will be resolved before its children. 13093 * 13094 * @return true if resolution has been done, false otherwise. 13095 * 13096 * @hide 13097 */ 13098 public boolean resolveLayoutDirection() { 13099 // Clear any previous layout direction resolution 13100 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 13101 13102 if (hasRtlSupport()) { 13103 // Set resolved depending on layout direction 13104 switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> 13105 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) { 13106 case LAYOUT_DIRECTION_INHERIT: 13107 // We cannot resolve yet. LTR is by default and let the resolution happen again 13108 // later to get the correct resolved value 13109 if (!canResolveLayoutDirection()) return false; 13110 13111 // Parent has not yet resolved, LTR is still the default 13112 try { 13113 if (!mParent.isLayoutDirectionResolved()) return false; 13114 13115 if (mParent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) { 13116 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 13117 } 13118 } catch (AbstractMethodError e) { 13119 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 13120 " does not fully implement ViewParent", e); 13121 } 13122 break; 13123 case LAYOUT_DIRECTION_RTL: 13124 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 13125 break; 13126 case LAYOUT_DIRECTION_LOCALE: 13127 if((LAYOUT_DIRECTION_RTL == 13128 TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) { 13129 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 13130 } 13131 break; 13132 default: 13133 // Nothing to do, LTR by default 13134 } 13135 } 13136 13137 // Set to resolved 13138 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 13139 return true; 13140 } 13141 13142 /** 13143 * Check if layout direction resolution can be done. 13144 * 13145 * @return true if layout direction resolution can be done otherwise return false. 13146 */ 13147 public boolean canResolveLayoutDirection() { 13148 switch (getRawLayoutDirection()) { 13149 case LAYOUT_DIRECTION_INHERIT: 13150 if (mParent != null) { 13151 try { 13152 return mParent.canResolveLayoutDirection(); 13153 } catch (AbstractMethodError e) { 13154 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 13155 " does not fully implement ViewParent", e); 13156 } 13157 } 13158 return false; 13159 13160 default: 13161 return true; 13162 } 13163 } 13164 13165 /** 13166 * Reset the resolved layout direction. Layout direction will be resolved during a call to 13167 * {@link #onMeasure(int, int)}. 13168 * 13169 * @hide 13170 */ 13171 public void resetResolvedLayoutDirection() { 13172 // Reset the current resolved bits 13173 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 13174 } 13175 13176 /** 13177 * @return true if the layout direction is inherited. 13178 * 13179 * @hide 13180 */ 13181 public boolean isLayoutDirectionInherited() { 13182 return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT); 13183 } 13184 13185 /** 13186 * @return true if layout direction has been resolved. 13187 */ 13188 public boolean isLayoutDirectionResolved() { 13189 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED; 13190 } 13191 13192 /** 13193 * Return if padding has been resolved 13194 * 13195 * @hide 13196 */ 13197 boolean isPaddingResolved() { 13198 return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED; 13199 } 13200 13201 /** 13202 * Resolves padding depending on layout direction, if applicable, and 13203 * recomputes internal padding values to adjust for scroll bars. 13204 * 13205 * @hide 13206 */ 13207 public void resolvePadding() { 13208 final int resolvedLayoutDirection = getLayoutDirection(); 13209 13210 if (!isRtlCompatibilityMode()) { 13211 // Post Jelly Bean MR1 case: we need to take the resolved layout direction into account. 13212 // If start / end padding are defined, they will be resolved (hence overriding) to 13213 // left / right or right / left depending on the resolved layout direction. 13214 // If start / end padding are not defined, use the left / right ones. 13215 if (mBackground != null && (!mLeftPaddingDefined || !mRightPaddingDefined)) { 13216 Rect padding = sThreadLocal.get(); 13217 if (padding == null) { 13218 padding = new Rect(); 13219 sThreadLocal.set(padding); 13220 } 13221 mBackground.getPadding(padding); 13222 if (!mLeftPaddingDefined) { 13223 mUserPaddingLeftInitial = padding.left; 13224 } 13225 if (!mRightPaddingDefined) { 13226 mUserPaddingRightInitial = padding.right; 13227 } 13228 } 13229 switch (resolvedLayoutDirection) { 13230 case LAYOUT_DIRECTION_RTL: 13231 if (mUserPaddingStart != UNDEFINED_PADDING) { 13232 mUserPaddingRight = mUserPaddingStart; 13233 } else { 13234 mUserPaddingRight = mUserPaddingRightInitial; 13235 } 13236 if (mUserPaddingEnd != UNDEFINED_PADDING) { 13237 mUserPaddingLeft = mUserPaddingEnd; 13238 } else { 13239 mUserPaddingLeft = mUserPaddingLeftInitial; 13240 } 13241 break; 13242 case LAYOUT_DIRECTION_LTR: 13243 default: 13244 if (mUserPaddingStart != UNDEFINED_PADDING) { 13245 mUserPaddingLeft = mUserPaddingStart; 13246 } else { 13247 mUserPaddingLeft = mUserPaddingLeftInitial; 13248 } 13249 if (mUserPaddingEnd != UNDEFINED_PADDING) { 13250 mUserPaddingRight = mUserPaddingEnd; 13251 } else { 13252 mUserPaddingRight = mUserPaddingRightInitial; 13253 } 13254 } 13255 13256 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 13257 } 13258 13259 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 13260 onRtlPropertiesChanged(resolvedLayoutDirection); 13261 13262 mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED; 13263 } 13264 13265 /** 13266 * Reset the resolved layout direction. 13267 * 13268 * @hide 13269 */ 13270 public void resetResolvedPadding() { 13271 mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED; 13272 } 13273 13274 /** 13275 * This is called when the view is detached from a window. At this point it 13276 * no longer has a surface for drawing. 13277 * 13278 * @see #onAttachedToWindow() 13279 */ 13280 protected void onDetachedFromWindow() { 13281 } 13282 13283 /** 13284 * This is a framework-internal mirror of onDetachedFromWindow() that's called 13285 * after onDetachedFromWindow(). 13286 * 13287 * If you override this you *MUST* call super.onDetachedFromWindowInternal()! 13288 * The super method should be called at the end of the overriden method to ensure 13289 * subclasses are destroyed first 13290 * 13291 * @hide 13292 */ 13293 protected void onDetachedFromWindowInternal() { 13294 mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 13295 mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; 13296 13297 removeUnsetPressCallback(); 13298 removeLongPressCallback(); 13299 removePerformClickCallback(); 13300 removeSendViewScrolledAccessibilityEventCallback(); 13301 stopNestedScroll(); 13302 13303 // Anything that started animating right before detach should already 13304 // be in its final state when re-attached. 13305 jumpDrawablesToCurrentState(); 13306 13307 destroyDrawingCache(); 13308 13309 cleanupDraw(); 13310 mCurrentAnimation = null; 13311 } 13312 13313 private void cleanupDraw() { 13314 resetDisplayList(); 13315 if (mAttachInfo != null) { 13316 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 13317 } 13318 } 13319 13320 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 13321 } 13322 13323 /** 13324 * @return The number of times this view has been attached to a window 13325 */ 13326 protected int getWindowAttachCount() { 13327 return mWindowAttachCount; 13328 } 13329 13330 /** 13331 * Retrieve a unique token identifying the window this view is attached to. 13332 * @return Return the window's token for use in 13333 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 13334 */ 13335 public IBinder getWindowToken() { 13336 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 13337 } 13338 13339 /** 13340 * Retrieve the {@link WindowId} for the window this view is 13341 * currently attached to. 13342 */ 13343 public WindowId getWindowId() { 13344 if (mAttachInfo == null) { 13345 return null; 13346 } 13347 if (mAttachInfo.mWindowId == null) { 13348 try { 13349 mAttachInfo.mIWindowId = mAttachInfo.mSession.getWindowId( 13350 mAttachInfo.mWindowToken); 13351 mAttachInfo.mWindowId = new WindowId( 13352 mAttachInfo.mIWindowId); 13353 } catch (RemoteException e) { 13354 } 13355 } 13356 return mAttachInfo.mWindowId; 13357 } 13358 13359 /** 13360 * Retrieve a unique token identifying the top-level "real" window of 13361 * the window that this view is attached to. That is, this is like 13362 * {@link #getWindowToken}, except if the window this view in is a panel 13363 * window (attached to another containing window), then the token of 13364 * the containing window is returned instead. 13365 * 13366 * @return Returns the associated window token, either 13367 * {@link #getWindowToken()} or the containing window's token. 13368 */ 13369 public IBinder getApplicationWindowToken() { 13370 AttachInfo ai = mAttachInfo; 13371 if (ai != null) { 13372 IBinder appWindowToken = ai.mPanelParentWindowToken; 13373 if (appWindowToken == null) { 13374 appWindowToken = ai.mWindowToken; 13375 } 13376 return appWindowToken; 13377 } 13378 return null; 13379 } 13380 13381 /** 13382 * Gets the logical display to which the view's window has been attached. 13383 * 13384 * @return The logical display, or null if the view is not currently attached to a window. 13385 */ 13386 public Display getDisplay() { 13387 return mAttachInfo != null ? mAttachInfo.mDisplay : null; 13388 } 13389 13390 /** 13391 * Retrieve private session object this view hierarchy is using to 13392 * communicate with the window manager. 13393 * @return the session object to communicate with the window manager 13394 */ 13395 /*package*/ IWindowSession getWindowSession() { 13396 return mAttachInfo != null ? mAttachInfo.mSession : null; 13397 } 13398 13399 /** 13400 * @param info the {@link android.view.View.AttachInfo} to associated with 13401 * this view 13402 */ 13403 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 13404 //System.out.println("Attached! " + this); 13405 mAttachInfo = info; 13406 if (mOverlay != null) { 13407 mOverlay.getOverlayView().dispatchAttachedToWindow(info, visibility); 13408 } 13409 mWindowAttachCount++; 13410 // We will need to evaluate the drawable state at least once. 13411 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 13412 if (mFloatingTreeObserver != null) { 13413 info.mTreeObserver.merge(mFloatingTreeObserver); 13414 mFloatingTreeObserver = null; 13415 } 13416 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) { 13417 mAttachInfo.mScrollContainers.add(this); 13418 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 13419 } 13420 performCollectViewAttributes(mAttachInfo, visibility); 13421 onAttachedToWindow(); 13422 13423 ListenerInfo li = mListenerInfo; 13424 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 13425 li != null ? li.mOnAttachStateChangeListeners : null; 13426 if (listeners != null && listeners.size() > 0) { 13427 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 13428 // perform the dispatching. The iterator is a safe guard against listeners that 13429 // could mutate the list by calling the various add/remove methods. This prevents 13430 // the array from being modified while we iterate it. 13431 for (OnAttachStateChangeListener listener : listeners) { 13432 listener.onViewAttachedToWindow(this); 13433 } 13434 } 13435 13436 int vis = info.mWindowVisibility; 13437 if (vis != GONE) { 13438 onWindowVisibilityChanged(vis); 13439 } 13440 if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) { 13441 // If nobody has evaluated the drawable state yet, then do it now. 13442 refreshDrawableState(); 13443 } 13444 needGlobalAttributesUpdate(false); 13445 } 13446 13447 void dispatchDetachedFromWindow() { 13448 AttachInfo info = mAttachInfo; 13449 if (info != null) { 13450 int vis = info.mWindowVisibility; 13451 if (vis != GONE) { 13452 onWindowVisibilityChanged(GONE); 13453 } 13454 } 13455 13456 onDetachedFromWindow(); 13457 onDetachedFromWindowInternal(); 13458 13459 ListenerInfo li = mListenerInfo; 13460 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 13461 li != null ? li.mOnAttachStateChangeListeners : null; 13462 if (listeners != null && listeners.size() > 0) { 13463 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 13464 // perform the dispatching. The iterator is a safe guard against listeners that 13465 // could mutate the list by calling the various add/remove methods. This prevents 13466 // the array from being modified while we iterate it. 13467 for (OnAttachStateChangeListener listener : listeners) { 13468 listener.onViewDetachedFromWindow(this); 13469 } 13470 } 13471 13472 if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 13473 mAttachInfo.mScrollContainers.remove(this); 13474 mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED; 13475 } 13476 13477 mAttachInfo = null; 13478 if (mOverlay != null) { 13479 mOverlay.getOverlayView().dispatchDetachedFromWindow(); 13480 } 13481 } 13482 13483 /** 13484 * Cancel any deferred high-level input events that were previously posted to the event queue. 13485 * 13486 * <p>Many views post high-level events such as click handlers to the event queue 13487 * to run deferred in order to preserve a desired user experience - clearing visible 13488 * pressed states before executing, etc. This method will abort any events of this nature 13489 * that are currently in flight.</p> 13490 * 13491 * <p>Custom views that generate their own high-level deferred input events should override 13492 * {@link #onCancelPendingInputEvents()} and remove those pending events from the queue.</p> 13493 * 13494 * <p>This will also cancel pending input events for any child views.</p> 13495 * 13496 * <p>Note that this may not be sufficient as a debouncing strategy for clicks in all cases. 13497 * This will not impact newer events posted after this call that may occur as a result of 13498 * lower-level input events still waiting in the queue. If you are trying to prevent 13499 * double-submitted events for the duration of some sort of asynchronous transaction 13500 * you should also take other steps to protect against unexpected double inputs e.g. calling 13501 * {@link #setEnabled(boolean) setEnabled(false)} and re-enabling the view when 13502 * the transaction completes, tracking already submitted transaction IDs, etc.</p> 13503 */ 13504 public final void cancelPendingInputEvents() { 13505 dispatchCancelPendingInputEvents(); 13506 } 13507 13508 /** 13509 * Called by {@link #cancelPendingInputEvents()} to cancel input events in flight. 13510 * Overridden by ViewGroup to dispatch. Package scoped to prevent app-side meddling. 13511 */ 13512 void dispatchCancelPendingInputEvents() { 13513 mPrivateFlags3 &= ~PFLAG3_CALLED_SUPER; 13514 onCancelPendingInputEvents(); 13515 if ((mPrivateFlags3 & PFLAG3_CALLED_SUPER) != PFLAG3_CALLED_SUPER) { 13516 throw new SuperNotCalledException("View " + getClass().getSimpleName() + 13517 " did not call through to super.onCancelPendingInputEvents()"); 13518 } 13519 } 13520 13521 /** 13522 * Called as the result of a call to {@link #cancelPendingInputEvents()} on this view or 13523 * a parent view. 13524 * 13525 * <p>This method is responsible for removing any pending high-level input events that were 13526 * posted to the event queue to run later. Custom view classes that post their own deferred 13527 * high-level events via {@link #post(Runnable)}, {@link #postDelayed(Runnable, long)} or 13528 * {@link android.os.Handler} should override this method, call 13529 * <code>super.onCancelPendingInputEvents()</code> and remove those callbacks as appropriate. 13530 * </p> 13531 */ 13532 public void onCancelPendingInputEvents() { 13533 removePerformClickCallback(); 13534 cancelLongPress(); 13535 mPrivateFlags3 |= PFLAG3_CALLED_SUPER; 13536 } 13537 13538 /** 13539 * Store this view hierarchy's frozen state into the given container. 13540 * 13541 * @param container The SparseArray in which to save the view's state. 13542 * 13543 * @see #restoreHierarchyState(android.util.SparseArray) 13544 * @see #dispatchSaveInstanceState(android.util.SparseArray) 13545 * @see #onSaveInstanceState() 13546 */ 13547 public void saveHierarchyState(SparseArray<Parcelable> container) { 13548 dispatchSaveInstanceState(container); 13549 } 13550 13551 /** 13552 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 13553 * this view and its children. May be overridden to modify how freezing happens to a 13554 * view's children; for example, some views may want to not store state for their children. 13555 * 13556 * @param container The SparseArray in which to save the view's state. 13557 * 13558 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 13559 * @see #saveHierarchyState(android.util.SparseArray) 13560 * @see #onSaveInstanceState() 13561 */ 13562 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 13563 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 13564 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 13565 Parcelable state = onSaveInstanceState(); 13566 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 13567 throw new IllegalStateException( 13568 "Derived class did not call super.onSaveInstanceState()"); 13569 } 13570 if (state != null) { 13571 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 13572 // + ": " + state); 13573 container.put(mID, state); 13574 } 13575 } 13576 } 13577 13578 /** 13579 * Hook allowing a view to generate a representation of its internal state 13580 * that can later be used to create a new instance with that same state. 13581 * This state should only contain information that is not persistent or can 13582 * not be reconstructed later. For example, you will never store your 13583 * current position on screen because that will be computed again when a 13584 * new instance of the view is placed in its view hierarchy. 13585 * <p> 13586 * Some examples of things you may store here: the current cursor position 13587 * in a text view (but usually not the text itself since that is stored in a 13588 * content provider or other persistent storage), the currently selected 13589 * item in a list view. 13590 * 13591 * @return Returns a Parcelable object containing the view's current dynamic 13592 * state, or null if there is nothing interesting to save. The 13593 * default implementation returns null. 13594 * @see #onRestoreInstanceState(android.os.Parcelable) 13595 * @see #saveHierarchyState(android.util.SparseArray) 13596 * @see #dispatchSaveInstanceState(android.util.SparseArray) 13597 * @see #setSaveEnabled(boolean) 13598 */ 13599 protected Parcelable onSaveInstanceState() { 13600 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 13601 return BaseSavedState.EMPTY_STATE; 13602 } 13603 13604 /** 13605 * Restore this view hierarchy's frozen state from the given container. 13606 * 13607 * @param container The SparseArray which holds previously frozen states. 13608 * 13609 * @see #saveHierarchyState(android.util.SparseArray) 13610 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 13611 * @see #onRestoreInstanceState(android.os.Parcelable) 13612 */ 13613 public void restoreHierarchyState(SparseArray<Parcelable> container) { 13614 dispatchRestoreInstanceState(container); 13615 } 13616 13617 /** 13618 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 13619 * state for this view and its children. May be overridden to modify how restoring 13620 * happens to a view's children; for example, some views may want to not store state 13621 * for their children. 13622 * 13623 * @param container The SparseArray which holds previously saved state. 13624 * 13625 * @see #dispatchSaveInstanceState(android.util.SparseArray) 13626 * @see #restoreHierarchyState(android.util.SparseArray) 13627 * @see #onRestoreInstanceState(android.os.Parcelable) 13628 */ 13629 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 13630 if (mID != NO_ID) { 13631 Parcelable state = container.get(mID); 13632 if (state != null) { 13633 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 13634 // + ": " + state); 13635 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 13636 onRestoreInstanceState(state); 13637 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 13638 throw new IllegalStateException( 13639 "Derived class did not call super.onRestoreInstanceState()"); 13640 } 13641 } 13642 } 13643 } 13644 13645 /** 13646 * Hook allowing a view to re-apply a representation of its internal state that had previously 13647 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 13648 * null state. 13649 * 13650 * @param state The frozen state that had previously been returned by 13651 * {@link #onSaveInstanceState}. 13652 * 13653 * @see #onSaveInstanceState() 13654 * @see #restoreHierarchyState(android.util.SparseArray) 13655 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 13656 */ 13657 protected void onRestoreInstanceState(Parcelable state) { 13658 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 13659 if (state != BaseSavedState.EMPTY_STATE && state != null) { 13660 throw new IllegalArgumentException("Wrong state class, expecting View State but " 13661 + "received " + state.getClass().toString() + " instead. This usually happens " 13662 + "when two views of different type have the same id in the same hierarchy. " 13663 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 13664 + "other views do not use the same id."); 13665 } 13666 } 13667 13668 /** 13669 * <p>Return the time at which the drawing of the view hierarchy started.</p> 13670 * 13671 * @return the drawing start time in milliseconds 13672 */ 13673 public long getDrawingTime() { 13674 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 13675 } 13676 13677 /** 13678 * <p>Enables or disables the duplication of the parent's state into this view. When 13679 * duplication is enabled, this view gets its drawable state from its parent rather 13680 * than from its own internal properties.</p> 13681 * 13682 * <p>Note: in the current implementation, setting this property to true after the 13683 * view was added to a ViewGroup might have no effect at all. This property should 13684 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 13685 * 13686 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 13687 * property is enabled, an exception will be thrown.</p> 13688 * 13689 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 13690 * parent, these states should not be affected by this method.</p> 13691 * 13692 * @param enabled True to enable duplication of the parent's drawable state, false 13693 * to disable it. 13694 * 13695 * @see #getDrawableState() 13696 * @see #isDuplicateParentStateEnabled() 13697 */ 13698 public void setDuplicateParentStateEnabled(boolean enabled) { 13699 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 13700 } 13701 13702 /** 13703 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 13704 * 13705 * @return True if this view's drawable state is duplicated from the parent, 13706 * false otherwise 13707 * 13708 * @see #getDrawableState() 13709 * @see #setDuplicateParentStateEnabled(boolean) 13710 */ 13711 public boolean isDuplicateParentStateEnabled() { 13712 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 13713 } 13714 13715 /** 13716 * <p>Specifies the type of layer backing this view. The layer can be 13717 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 13718 * {@link #LAYER_TYPE_HARDWARE}.</p> 13719 * 13720 * <p>A layer is associated with an optional {@link android.graphics.Paint} 13721 * instance that controls how the layer is composed on screen. The following 13722 * properties of the paint are taken into account when composing the layer:</p> 13723 * <ul> 13724 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 13725 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 13726 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 13727 * </ul> 13728 * 13729 * <p>If this view has an alpha value set to < 1.0 by calling 13730 * {@link #setAlpha(float)}, the alpha value of the layer's paint is superceded 13731 * by this view's alpha value.</p> 13732 * 13733 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE}, 13734 * {@link #LAYER_TYPE_SOFTWARE} and {@link #LAYER_TYPE_HARDWARE} 13735 * for more information on when and how to use layers.</p> 13736 * 13737 * @param layerType The type of layer to use with this view, must be one of 13738 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 13739 * {@link #LAYER_TYPE_HARDWARE} 13740 * @param paint The paint used to compose the layer. This argument is optional 13741 * and can be null. It is ignored when the layer type is 13742 * {@link #LAYER_TYPE_NONE} 13743 * 13744 * @see #getLayerType() 13745 * @see #LAYER_TYPE_NONE 13746 * @see #LAYER_TYPE_SOFTWARE 13747 * @see #LAYER_TYPE_HARDWARE 13748 * @see #setAlpha(float) 13749 * 13750 * @attr ref android.R.styleable#View_layerType 13751 */ 13752 public void setLayerType(int layerType, Paint paint) { 13753 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 13754 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 13755 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 13756 } 13757 13758 boolean typeChanged = mRenderNode.setLayerType(layerType); 13759 13760 if (!typeChanged) { 13761 setLayerPaint(paint); 13762 return; 13763 } 13764 13765 // Destroy any previous software drawing cache if needed 13766 if (mLayerType == LAYER_TYPE_SOFTWARE) { 13767 destroyDrawingCache(); 13768 } 13769 13770 mLayerType = layerType; 13771 final boolean layerDisabled = (mLayerType == LAYER_TYPE_NONE); 13772 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 13773 mRenderNode.setLayerPaint(mLayerPaint); 13774 13775 // draw() behaves differently if we are on a layer, so we need to 13776 // invalidate() here 13777 invalidateParentCaches(); 13778 invalidate(true); 13779 } 13780 13781 /** 13782 * Updates the {@link Paint} object used with the current layer (used only if the current 13783 * layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint 13784 * provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time 13785 * the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to 13786 * ensure that the view gets redrawn immediately. 13787 * 13788 * <p>A layer is associated with an optional {@link android.graphics.Paint} 13789 * instance that controls how the layer is composed on screen. The following 13790 * properties of the paint are taken into account when composing the layer:</p> 13791 * <ul> 13792 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 13793 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 13794 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 13795 * </ul> 13796 * 13797 * <p>If this view has an alpha value set to < 1.0 by calling {@link #setAlpha(float)}, the 13798 * alpha value of the layer's paint is superceded by this view's alpha value.</p> 13799 * 13800 * @param paint The paint used to compose the layer. This argument is optional 13801 * and can be null. It is ignored when the layer type is 13802 * {@link #LAYER_TYPE_NONE} 13803 * 13804 * @see #setLayerType(int, android.graphics.Paint) 13805 */ 13806 public void setLayerPaint(Paint paint) { 13807 int layerType = getLayerType(); 13808 if (layerType != LAYER_TYPE_NONE) { 13809 mLayerPaint = paint == null ? new Paint() : paint; 13810 if (layerType == LAYER_TYPE_HARDWARE) { 13811 if (mRenderNode.setLayerPaint(mLayerPaint)) { 13812 invalidateViewProperty(false, false); 13813 } 13814 } else { 13815 invalidate(); 13816 } 13817 } 13818 } 13819 13820 /** 13821 * Indicates whether this view has a static layer. A view with layer type 13822 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 13823 * dynamic. 13824 */ 13825 boolean hasStaticLayer() { 13826 return true; 13827 } 13828 13829 /** 13830 * Indicates what type of layer is currently associated with this view. By default 13831 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 13832 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 13833 * for more information on the different types of layers. 13834 * 13835 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 13836 * {@link #LAYER_TYPE_HARDWARE} 13837 * 13838 * @see #setLayerType(int, android.graphics.Paint) 13839 * @see #buildLayer() 13840 * @see #LAYER_TYPE_NONE 13841 * @see #LAYER_TYPE_SOFTWARE 13842 * @see #LAYER_TYPE_HARDWARE 13843 */ 13844 public int getLayerType() { 13845 return mLayerType; 13846 } 13847 13848 /** 13849 * Forces this view's layer to be created and this view to be rendered 13850 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 13851 * invoking this method will have no effect. 13852 * 13853 * This method can for instance be used to render a view into its layer before 13854 * starting an animation. If this view is complex, rendering into the layer 13855 * before starting the animation will avoid skipping frames. 13856 * 13857 * @throws IllegalStateException If this view is not attached to a window 13858 * 13859 * @see #setLayerType(int, android.graphics.Paint) 13860 */ 13861 public void buildLayer() { 13862 if (mLayerType == LAYER_TYPE_NONE) return; 13863 13864 final AttachInfo attachInfo = mAttachInfo; 13865 if (attachInfo == null) { 13866 throw new IllegalStateException("This view must be attached to a window first"); 13867 } 13868 13869 if (getWidth() == 0 || getHeight() == 0) { 13870 return; 13871 } 13872 13873 switch (mLayerType) { 13874 case LAYER_TYPE_HARDWARE: 13875 updateDisplayListIfDirty(); 13876 if (attachInfo.mHardwareRenderer != null && mRenderNode.isValid()) { 13877 attachInfo.mHardwareRenderer.buildLayer(mRenderNode); 13878 } 13879 break; 13880 case LAYER_TYPE_SOFTWARE: 13881 buildDrawingCache(true); 13882 break; 13883 } 13884 } 13885 13886 /** 13887 * If this View draws with a HardwareLayer, returns it. 13888 * Otherwise returns null 13889 * 13890 * TODO: Only TextureView uses this, can we eliminate it? 13891 */ 13892 HardwareLayer getHardwareLayer() { 13893 return null; 13894 } 13895 13896 /** 13897 * Destroys all hardware rendering resources. This method is invoked 13898 * when the system needs to reclaim resources. Upon execution of this 13899 * method, you should free any OpenGL resources created by the view. 13900 * 13901 * Note: you <strong>must</strong> call 13902 * <code>super.destroyHardwareResources()</code> when overriding 13903 * this method. 13904 * 13905 * @hide 13906 */ 13907 protected void destroyHardwareResources() { 13908 // Although the Layer will be destroyed by RenderNode, we want to release 13909 // the staging display list, which is also a signal to RenderNode that it's 13910 // safe to free its copy of the display list as it knows that we will 13911 // push an updated DisplayList if we try to draw again 13912 resetDisplayList(); 13913 } 13914 13915 /** 13916 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 13917 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 13918 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 13919 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 13920 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 13921 * null.</p> 13922 * 13923 * <p>Enabling the drawing cache is similar to 13924 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 13925 * acceleration is turned off. When hardware acceleration is turned on, enabling the 13926 * drawing cache has no effect on rendering because the system uses a different mechanism 13927 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 13928 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 13929 * for information on how to enable software and hardware layers.</p> 13930 * 13931 * <p>This API can be used to manually generate 13932 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 13933 * {@link #getDrawingCache()}.</p> 13934 * 13935 * @param enabled true to enable the drawing cache, false otherwise 13936 * 13937 * @see #isDrawingCacheEnabled() 13938 * @see #getDrawingCache() 13939 * @see #buildDrawingCache() 13940 * @see #setLayerType(int, android.graphics.Paint) 13941 */ 13942 public void setDrawingCacheEnabled(boolean enabled) { 13943 mCachingFailed = false; 13944 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 13945 } 13946 13947 /** 13948 * <p>Indicates whether the drawing cache is enabled for this view.</p> 13949 * 13950 * @return true if the drawing cache is enabled 13951 * 13952 * @see #setDrawingCacheEnabled(boolean) 13953 * @see #getDrawingCache() 13954 */ 13955 @ViewDebug.ExportedProperty(category = "drawing") 13956 public boolean isDrawingCacheEnabled() { 13957 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 13958 } 13959 13960 /** 13961 * Debugging utility which recursively outputs the dirty state of a view and its 13962 * descendants. 13963 * 13964 * @hide 13965 */ 13966 @SuppressWarnings({"UnusedDeclaration"}) 13967 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 13968 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.PFLAG_DIRTY_MASK) + 13969 ") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID(" + 13970 (mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID) + 13971 ") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")"); 13972 if (clear) { 13973 mPrivateFlags &= clearMask; 13974 } 13975 if (this instanceof ViewGroup) { 13976 ViewGroup parent = (ViewGroup) this; 13977 final int count = parent.getChildCount(); 13978 for (int i = 0; i < count; i++) { 13979 final View child = parent.getChildAt(i); 13980 child.outputDirtyFlags(indent + " ", clear, clearMask); 13981 } 13982 } 13983 } 13984 13985 /** 13986 * This method is used by ViewGroup to cause its children to restore or recreate their 13987 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 13988 * to recreate its own display list, which would happen if it went through the normal 13989 * draw/dispatchDraw mechanisms. 13990 * 13991 * @hide 13992 */ 13993 protected void dispatchGetDisplayList() {} 13994 13995 /** 13996 * A view that is not attached or hardware accelerated cannot create a display list. 13997 * This method checks these conditions and returns the appropriate result. 13998 * 13999 * @return true if view has the ability to create a display list, false otherwise. 14000 * 14001 * @hide 14002 */ 14003 public boolean canHaveDisplayList() { 14004 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 14005 } 14006 14007 private void updateDisplayListIfDirty() { 14008 final RenderNode renderNode = mRenderNode; 14009 if (!canHaveDisplayList()) { 14010 // can't populate RenderNode, don't try 14011 return; 14012 } 14013 14014 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 14015 || !renderNode.isValid() 14016 || (mRecreateDisplayList)) { 14017 // Don't need to recreate the display list, just need to tell our 14018 // children to restore/recreate theirs 14019 if (renderNode.isValid() 14020 && !mRecreateDisplayList) { 14021 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 14022 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 14023 dispatchGetDisplayList(); 14024 14025 return; // no work needed 14026 } 14027 14028 // If we got here, we're recreating it. Mark it as such to ensure that 14029 // we copy in child display lists into ours in drawChild() 14030 mRecreateDisplayList = true; 14031 14032 int width = mRight - mLeft; 14033 int height = mBottom - mTop; 14034 int layerType = getLayerType(); 14035 14036 final HardwareCanvas canvas = renderNode.start(width, height); 14037 canvas.setHighContrastText(mAttachInfo.mHighContrastText); 14038 14039 try { 14040 final HardwareLayer layer = getHardwareLayer(); 14041 if (layer != null && layer.isValid()) { 14042 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 14043 } else if (layerType == LAYER_TYPE_SOFTWARE) { 14044 buildDrawingCache(true); 14045 Bitmap cache = getDrawingCache(true); 14046 if (cache != null) { 14047 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 14048 } 14049 } else { 14050 computeScroll(); 14051 14052 canvas.translate(-mScrollX, -mScrollY); 14053 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 14054 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 14055 14056 // Fast path for layouts with no backgrounds 14057 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 14058 dispatchDraw(canvas); 14059 if (mOverlay != null && !mOverlay.isEmpty()) { 14060 mOverlay.getOverlayView().draw(canvas); 14061 } 14062 } else { 14063 draw(canvas); 14064 } 14065 } 14066 } finally { 14067 renderNode.end(canvas); 14068 setDisplayListProperties(renderNode); 14069 } 14070 } else { 14071 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 14072 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 14073 } 14074 } 14075 14076 /** 14077 * Returns a RenderNode with View draw content recorded, which can be 14078 * used to draw this view again without executing its draw method. 14079 * 14080 * @return A RenderNode ready to replay, or null if caching is not enabled. 14081 * 14082 * @hide 14083 */ 14084 public RenderNode getDisplayList() { 14085 updateDisplayListIfDirty(); 14086 return mRenderNode; 14087 } 14088 14089 private void resetDisplayList() { 14090 if (mRenderNode.isValid()) { 14091 mRenderNode.destroyDisplayListData(); 14092 } 14093 14094 if (mBackgroundRenderNode != null && mBackgroundRenderNode.isValid()) { 14095 mBackgroundRenderNode.destroyDisplayListData(); 14096 } 14097 } 14098 14099 /** 14100 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 14101 * 14102 * @return A non-scaled bitmap representing this view or null if cache is disabled. 14103 * 14104 * @see #getDrawingCache(boolean) 14105 */ 14106 public Bitmap getDrawingCache() { 14107 return getDrawingCache(false); 14108 } 14109 14110 /** 14111 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 14112 * is null when caching is disabled. If caching is enabled and the cache is not ready, 14113 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 14114 * draw from the cache when the cache is enabled. To benefit from the cache, you must 14115 * request the drawing cache by calling this method and draw it on screen if the 14116 * returned bitmap is not null.</p> 14117 * 14118 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 14119 * this method will create a bitmap of the same size as this view. Because this bitmap 14120 * will be drawn scaled by the parent ViewGroup, the result on screen might show 14121 * scaling artifacts. To avoid such artifacts, you should call this method by setting 14122 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 14123 * size than the view. This implies that your application must be able to handle this 14124 * size.</p> 14125 * 14126 * @param autoScale Indicates whether the generated bitmap should be scaled based on 14127 * the current density of the screen when the application is in compatibility 14128 * mode. 14129 * 14130 * @return A bitmap representing this view or null if cache is disabled. 14131 * 14132 * @see #setDrawingCacheEnabled(boolean) 14133 * @see #isDrawingCacheEnabled() 14134 * @see #buildDrawingCache(boolean) 14135 * @see #destroyDrawingCache() 14136 */ 14137 public Bitmap getDrawingCache(boolean autoScale) { 14138 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 14139 return null; 14140 } 14141 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 14142 buildDrawingCache(autoScale); 14143 } 14144 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 14145 } 14146 14147 /** 14148 * <p>Frees the resources used by the drawing cache. If you call 14149 * {@link #buildDrawingCache()} manually without calling 14150 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 14151 * should cleanup the cache with this method afterwards.</p> 14152 * 14153 * @see #setDrawingCacheEnabled(boolean) 14154 * @see #buildDrawingCache() 14155 * @see #getDrawingCache() 14156 */ 14157 public void destroyDrawingCache() { 14158 if (mDrawingCache != null) { 14159 mDrawingCache.recycle(); 14160 mDrawingCache = null; 14161 } 14162 if (mUnscaledDrawingCache != null) { 14163 mUnscaledDrawingCache.recycle(); 14164 mUnscaledDrawingCache = null; 14165 } 14166 } 14167 14168 /** 14169 * Setting a solid background color for the drawing cache's bitmaps will improve 14170 * performance and memory usage. Note, though that this should only be used if this 14171 * view will always be drawn on top of a solid color. 14172 * 14173 * @param color The background color to use for the drawing cache's bitmap 14174 * 14175 * @see #setDrawingCacheEnabled(boolean) 14176 * @see #buildDrawingCache() 14177 * @see #getDrawingCache() 14178 */ 14179 public void setDrawingCacheBackgroundColor(int color) { 14180 if (color != mDrawingCacheBackgroundColor) { 14181 mDrawingCacheBackgroundColor = color; 14182 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 14183 } 14184 } 14185 14186 /** 14187 * @see #setDrawingCacheBackgroundColor(int) 14188 * 14189 * @return The background color to used for the drawing cache's bitmap 14190 */ 14191 public int getDrawingCacheBackgroundColor() { 14192 return mDrawingCacheBackgroundColor; 14193 } 14194 14195 /** 14196 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 14197 * 14198 * @see #buildDrawingCache(boolean) 14199 */ 14200 public void buildDrawingCache() { 14201 buildDrawingCache(false); 14202 } 14203 14204 /** 14205 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 14206 * 14207 * <p>If you call {@link #buildDrawingCache()} manually without calling 14208 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 14209 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 14210 * 14211 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 14212 * this method will create a bitmap of the same size as this view. Because this bitmap 14213 * will be drawn scaled by the parent ViewGroup, the result on screen might show 14214 * scaling artifacts. To avoid such artifacts, you should call this method by setting 14215 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 14216 * size than the view. This implies that your application must be able to handle this 14217 * size.</p> 14218 * 14219 * <p>You should avoid calling this method when hardware acceleration is enabled. If 14220 * you do not need the drawing cache bitmap, calling this method will increase memory 14221 * usage and cause the view to be rendered in software once, thus negatively impacting 14222 * performance.</p> 14223 * 14224 * @see #getDrawingCache() 14225 * @see #destroyDrawingCache() 14226 */ 14227 public void buildDrawingCache(boolean autoScale) { 14228 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ? 14229 mDrawingCache == null : mUnscaledDrawingCache == null)) { 14230 mCachingFailed = false; 14231 14232 int width = mRight - mLeft; 14233 int height = mBottom - mTop; 14234 14235 final AttachInfo attachInfo = mAttachInfo; 14236 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 14237 14238 if (autoScale && scalingRequired) { 14239 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 14240 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 14241 } 14242 14243 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 14244 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 14245 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 14246 14247 final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4); 14248 final long drawingCacheSize = 14249 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize(); 14250 if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) { 14251 if (width > 0 && height > 0) { 14252 Log.w(VIEW_LOG_TAG, "View too large to fit into drawing cache, needs " 14253 + projectedBitmapSize + " bytes, only " 14254 + drawingCacheSize + " available"); 14255 } 14256 destroyDrawingCache(); 14257 mCachingFailed = true; 14258 return; 14259 } 14260 14261 boolean clear = true; 14262 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 14263 14264 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 14265 Bitmap.Config quality; 14266 if (!opaque) { 14267 // Never pick ARGB_4444 because it looks awful 14268 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 14269 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 14270 case DRAWING_CACHE_QUALITY_AUTO: 14271 case DRAWING_CACHE_QUALITY_LOW: 14272 case DRAWING_CACHE_QUALITY_HIGH: 14273 default: 14274 quality = Bitmap.Config.ARGB_8888; 14275 break; 14276 } 14277 } else { 14278 // Optimization for translucent windows 14279 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 14280 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 14281 } 14282 14283 // Try to cleanup memory 14284 if (bitmap != null) bitmap.recycle(); 14285 14286 try { 14287 bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 14288 width, height, quality); 14289 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 14290 if (autoScale) { 14291 mDrawingCache = bitmap; 14292 } else { 14293 mUnscaledDrawingCache = bitmap; 14294 } 14295 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 14296 } catch (OutOfMemoryError e) { 14297 // If there is not enough memory to create the bitmap cache, just 14298 // ignore the issue as bitmap caches are not required to draw the 14299 // view hierarchy 14300 if (autoScale) { 14301 mDrawingCache = null; 14302 } else { 14303 mUnscaledDrawingCache = null; 14304 } 14305 mCachingFailed = true; 14306 return; 14307 } 14308 14309 clear = drawingCacheBackgroundColor != 0; 14310 } 14311 14312 Canvas canvas; 14313 if (attachInfo != null) { 14314 canvas = attachInfo.mCanvas; 14315 if (canvas == null) { 14316 canvas = new Canvas(); 14317 } 14318 canvas.setBitmap(bitmap); 14319 // Temporarily clobber the cached Canvas in case one of our children 14320 // is also using a drawing cache. Without this, the children would 14321 // steal the canvas by attaching their own bitmap to it and bad, bad 14322 // thing would happen (invisible views, corrupted drawings, etc.) 14323 attachInfo.mCanvas = null; 14324 } else { 14325 // This case should hopefully never or seldom happen 14326 canvas = new Canvas(bitmap); 14327 } 14328 14329 if (clear) { 14330 bitmap.eraseColor(drawingCacheBackgroundColor); 14331 } 14332 14333 computeScroll(); 14334 final int restoreCount = canvas.save(); 14335 14336 if (autoScale && scalingRequired) { 14337 final float scale = attachInfo.mApplicationScale; 14338 canvas.scale(scale, scale); 14339 } 14340 14341 canvas.translate(-mScrollX, -mScrollY); 14342 14343 mPrivateFlags |= PFLAG_DRAWN; 14344 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 14345 mLayerType != LAYER_TYPE_NONE) { 14346 mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID; 14347 } 14348 14349 // Fast path for layouts with no backgrounds 14350 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 14351 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 14352 dispatchDraw(canvas); 14353 if (mOverlay != null && !mOverlay.isEmpty()) { 14354 mOverlay.getOverlayView().draw(canvas); 14355 } 14356 } else { 14357 draw(canvas); 14358 } 14359 14360 canvas.restoreToCount(restoreCount); 14361 canvas.setBitmap(null); 14362 14363 if (attachInfo != null) { 14364 // Restore the cached Canvas for our siblings 14365 attachInfo.mCanvas = canvas; 14366 } 14367 } 14368 } 14369 14370 /** 14371 * Create a snapshot of the view into a bitmap. We should probably make 14372 * some form of this public, but should think about the API. 14373 */ 14374 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 14375 int width = mRight - mLeft; 14376 int height = mBottom - mTop; 14377 14378 final AttachInfo attachInfo = mAttachInfo; 14379 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 14380 width = (int) ((width * scale) + 0.5f); 14381 height = (int) ((height * scale) + 0.5f); 14382 14383 Bitmap bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 14384 width > 0 ? width : 1, height > 0 ? height : 1, quality); 14385 if (bitmap == null) { 14386 throw new OutOfMemoryError(); 14387 } 14388 14389 Resources resources = getResources(); 14390 if (resources != null) { 14391 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 14392 } 14393 14394 Canvas canvas; 14395 if (attachInfo != null) { 14396 canvas = attachInfo.mCanvas; 14397 if (canvas == null) { 14398 canvas = new Canvas(); 14399 } 14400 canvas.setBitmap(bitmap); 14401 // Temporarily clobber the cached Canvas in case one of our children 14402 // is also using a drawing cache. Without this, the children would 14403 // steal the canvas by attaching their own bitmap to it and bad, bad 14404 // things would happen (invisible views, corrupted drawings, etc.) 14405 attachInfo.mCanvas = null; 14406 } else { 14407 // This case should hopefully never or seldom happen 14408 canvas = new Canvas(bitmap); 14409 } 14410 14411 if ((backgroundColor & 0xff000000) != 0) { 14412 bitmap.eraseColor(backgroundColor); 14413 } 14414 14415 computeScroll(); 14416 final int restoreCount = canvas.save(); 14417 canvas.scale(scale, scale); 14418 canvas.translate(-mScrollX, -mScrollY); 14419 14420 // Temporarily remove the dirty mask 14421 int flags = mPrivateFlags; 14422 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 14423 14424 // Fast path for layouts with no backgrounds 14425 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 14426 dispatchDraw(canvas); 14427 if (mOverlay != null && !mOverlay.isEmpty()) { 14428 mOverlay.getOverlayView().draw(canvas); 14429 } 14430 } else { 14431 draw(canvas); 14432 } 14433 14434 mPrivateFlags = flags; 14435 14436 canvas.restoreToCount(restoreCount); 14437 canvas.setBitmap(null); 14438 14439 if (attachInfo != null) { 14440 // Restore the cached Canvas for our siblings 14441 attachInfo.mCanvas = canvas; 14442 } 14443 14444 return bitmap; 14445 } 14446 14447 /** 14448 * Indicates whether this View is currently in edit mode. A View is usually 14449 * in edit mode when displayed within a developer tool. For instance, if 14450 * this View is being drawn by a visual user interface builder, this method 14451 * should return true. 14452 * 14453 * Subclasses should check the return value of this method to provide 14454 * different behaviors if their normal behavior might interfere with the 14455 * host environment. For instance: the class spawns a thread in its 14456 * constructor, the drawing code relies on device-specific features, etc. 14457 * 14458 * This method is usually checked in the drawing code of custom widgets. 14459 * 14460 * @return True if this View is in edit mode, false otherwise. 14461 */ 14462 public boolean isInEditMode() { 14463 return false; 14464 } 14465 14466 /** 14467 * If the View draws content inside its padding and enables fading edges, 14468 * it needs to support padding offsets. Padding offsets are added to the 14469 * fading edges to extend the length of the fade so that it covers pixels 14470 * drawn inside the padding. 14471 * 14472 * Subclasses of this class should override this method if they need 14473 * to draw content inside the padding. 14474 * 14475 * @return True if padding offset must be applied, false otherwise. 14476 * 14477 * @see #getLeftPaddingOffset() 14478 * @see #getRightPaddingOffset() 14479 * @see #getTopPaddingOffset() 14480 * @see #getBottomPaddingOffset() 14481 * 14482 * @since CURRENT 14483 */ 14484 protected boolean isPaddingOffsetRequired() { 14485 return false; 14486 } 14487 14488 /** 14489 * Amount by which to extend the left fading region. Called only when 14490 * {@link #isPaddingOffsetRequired()} returns true. 14491 * 14492 * @return The left padding offset in pixels. 14493 * 14494 * @see #isPaddingOffsetRequired() 14495 * 14496 * @since CURRENT 14497 */ 14498 protected int getLeftPaddingOffset() { 14499 return 0; 14500 } 14501 14502 /** 14503 * Amount by which to extend the right fading region. Called only when 14504 * {@link #isPaddingOffsetRequired()} returns true. 14505 * 14506 * @return The right padding offset in pixels. 14507 * 14508 * @see #isPaddingOffsetRequired() 14509 * 14510 * @since CURRENT 14511 */ 14512 protected int getRightPaddingOffset() { 14513 return 0; 14514 } 14515 14516 /** 14517 * Amount by which to extend the top fading region. Called only when 14518 * {@link #isPaddingOffsetRequired()} returns true. 14519 * 14520 * @return The top padding offset in pixels. 14521 * 14522 * @see #isPaddingOffsetRequired() 14523 * 14524 * @since CURRENT 14525 */ 14526 protected int getTopPaddingOffset() { 14527 return 0; 14528 } 14529 14530 /** 14531 * Amount by which to extend the bottom fading region. Called only when 14532 * {@link #isPaddingOffsetRequired()} returns true. 14533 * 14534 * @return The bottom padding offset in pixels. 14535 * 14536 * @see #isPaddingOffsetRequired() 14537 * 14538 * @since CURRENT 14539 */ 14540 protected int getBottomPaddingOffset() { 14541 return 0; 14542 } 14543 14544 /** 14545 * @hide 14546 * @param offsetRequired 14547 */ 14548 protected int getFadeTop(boolean offsetRequired) { 14549 int top = mPaddingTop; 14550 if (offsetRequired) top += getTopPaddingOffset(); 14551 return top; 14552 } 14553 14554 /** 14555 * @hide 14556 * @param offsetRequired 14557 */ 14558 protected int getFadeHeight(boolean offsetRequired) { 14559 int padding = mPaddingTop; 14560 if (offsetRequired) padding += getTopPaddingOffset(); 14561 return mBottom - mTop - mPaddingBottom - padding; 14562 } 14563 14564 /** 14565 * <p>Indicates whether this view is attached to a hardware accelerated 14566 * window or not.</p> 14567 * 14568 * <p>Even if this method returns true, it does not mean that every call 14569 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 14570 * accelerated {@link android.graphics.Canvas}. For instance, if this view 14571 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 14572 * window is hardware accelerated, 14573 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 14574 * return false, and this method will return true.</p> 14575 * 14576 * @return True if the view is attached to a window and the window is 14577 * hardware accelerated; false in any other case. 14578 */ 14579 @ViewDebug.ExportedProperty(category = "drawing") 14580 public boolean isHardwareAccelerated() { 14581 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 14582 } 14583 14584 /** 14585 * Sets a rectangular area on this view to which the view will be clipped 14586 * when it is drawn. Setting the value to null will remove the clip bounds 14587 * and the view will draw normally, using its full bounds. 14588 * 14589 * @param clipBounds The rectangular area, in the local coordinates of 14590 * this view, to which future drawing operations will be clipped. 14591 */ 14592 public void setClipBounds(Rect clipBounds) { 14593 if (clipBounds != null) { 14594 if (clipBounds.equals(mClipBounds)) { 14595 return; 14596 } 14597 if (mClipBounds == null) { 14598 invalidate(); 14599 mClipBounds = new Rect(clipBounds); 14600 } else { 14601 invalidate(Math.min(mClipBounds.left, clipBounds.left), 14602 Math.min(mClipBounds.top, clipBounds.top), 14603 Math.max(mClipBounds.right, clipBounds.right), 14604 Math.max(mClipBounds.bottom, clipBounds.bottom)); 14605 mClipBounds.set(clipBounds); 14606 } 14607 } else { 14608 if (mClipBounds != null) { 14609 invalidate(); 14610 mClipBounds = null; 14611 } 14612 } 14613 mRenderNode.setClipBounds(mClipBounds); 14614 } 14615 14616 /** 14617 * Returns a copy of the current {@link #setClipBounds(Rect) clipBounds}. 14618 * 14619 * @return A copy of the current clip bounds if clip bounds are set, 14620 * otherwise null. 14621 */ 14622 public Rect getClipBounds() { 14623 return (mClipBounds != null) ? new Rect(mClipBounds) : null; 14624 } 14625 14626 /** 14627 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 14628 * case of an active Animation being run on the view. 14629 */ 14630 private boolean drawAnimation(ViewGroup parent, long drawingTime, 14631 Animation a, boolean scalingRequired) { 14632 Transformation invalidationTransform; 14633 final int flags = parent.mGroupFlags; 14634 final boolean initialized = a.isInitialized(); 14635 if (!initialized) { 14636 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 14637 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 14638 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 14639 onAnimationStart(); 14640 } 14641 14642 final Transformation t = parent.getChildTransformation(); 14643 boolean more = a.getTransformation(drawingTime, t, 1f); 14644 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 14645 if (parent.mInvalidationTransformation == null) { 14646 parent.mInvalidationTransformation = new Transformation(); 14647 } 14648 invalidationTransform = parent.mInvalidationTransformation; 14649 a.getTransformation(drawingTime, invalidationTransform, 1f); 14650 } else { 14651 invalidationTransform = t; 14652 } 14653 14654 if (more) { 14655 if (!a.willChangeBounds()) { 14656 if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) == 14657 ViewGroup.FLAG_OPTIMIZE_INVALIDATE) { 14658 parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED; 14659 } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) { 14660 // The child need to draw an animation, potentially offscreen, so 14661 // make sure we do not cancel invalidate requests 14662 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 14663 parent.invalidate(mLeft, mTop, mRight, mBottom); 14664 } 14665 } else { 14666 if (parent.mInvalidateRegion == null) { 14667 parent.mInvalidateRegion = new RectF(); 14668 } 14669 final RectF region = parent.mInvalidateRegion; 14670 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 14671 invalidationTransform); 14672 14673 // The child need to draw an animation, potentially offscreen, so 14674 // make sure we do not cancel invalidate requests 14675 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 14676 14677 final int left = mLeft + (int) region.left; 14678 final int top = mTop + (int) region.top; 14679 parent.invalidate(left, top, left + (int) (region.width() + .5f), 14680 top + (int) (region.height() + .5f)); 14681 } 14682 } 14683 return more; 14684 } 14685 14686 /** 14687 * This method is called by getDisplayList() when a display list is recorded for a View. 14688 * It pushes any properties to the RenderNode that aren't managed by the RenderNode. 14689 */ 14690 void setDisplayListProperties(RenderNode renderNode) { 14691 if (renderNode != null) { 14692 if ((mPrivateFlags3 & PFLAG3_OUTLINE_INVALID) != 0) { 14693 rebuildOutline(); 14694 mPrivateFlags3 &= ~PFLAG3_OUTLINE_INVALID; 14695 } 14696 renderNode.setHasOverlappingRendering(hasOverlappingRendering()); 14697 if (mParent instanceof ViewGroup) { 14698 renderNode.setClipToBounds( 14699 (((ViewGroup) mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 14700 } 14701 float alpha = 1; 14702 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 14703 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 14704 ViewGroup parentVG = (ViewGroup) mParent; 14705 final Transformation t = parentVG.getChildTransformation(); 14706 if (parentVG.getChildStaticTransformation(this, t)) { 14707 final int transformType = t.getTransformationType(); 14708 if (transformType != Transformation.TYPE_IDENTITY) { 14709 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 14710 alpha = t.getAlpha(); 14711 } 14712 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 14713 renderNode.setStaticMatrix(t.getMatrix()); 14714 } 14715 } 14716 } 14717 } 14718 if (mTransformationInfo != null) { 14719 alpha *= getFinalAlpha(); 14720 if (alpha < 1) { 14721 final int multipliedAlpha = (int) (255 * alpha); 14722 if (onSetAlpha(multipliedAlpha)) { 14723 alpha = 1; 14724 } 14725 } 14726 renderNode.setAlpha(alpha); 14727 } else if (alpha < 1) { 14728 renderNode.setAlpha(alpha); 14729 } 14730 } 14731 } 14732 14733 /** 14734 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 14735 * This draw() method is an implementation detail and is not intended to be overridden or 14736 * to be called from anywhere else other than ViewGroup.drawChild(). 14737 */ 14738 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 14739 boolean usingRenderNodeProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 14740 boolean more = false; 14741 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 14742 final int flags = parent.mGroupFlags; 14743 14744 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 14745 parent.getChildTransformation().clear(); 14746 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 14747 } 14748 14749 Transformation transformToApply = null; 14750 boolean concatMatrix = false; 14751 14752 boolean scalingRequired = false; 14753 boolean caching; 14754 int layerType = getLayerType(); 14755 14756 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 14757 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 14758 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 14759 caching = true; 14760 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 14761 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 14762 } else { 14763 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 14764 } 14765 14766 final Animation a = getAnimation(); 14767 if (a != null) { 14768 more = drawAnimation(parent, drawingTime, a, scalingRequired); 14769 concatMatrix = a.willChangeTransformationMatrix(); 14770 if (concatMatrix) { 14771 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 14772 } 14773 transformToApply = parent.getChildTransformation(); 14774 } else { 14775 if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) != 0) { 14776 // No longer animating: clear out old animation matrix 14777 mRenderNode.setAnimationMatrix(null); 14778 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 14779 } 14780 if (!usingRenderNodeProperties && 14781 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 14782 final Transformation t = parent.getChildTransformation(); 14783 final boolean hasTransform = parent.getChildStaticTransformation(this, t); 14784 if (hasTransform) { 14785 final int transformType = t.getTransformationType(); 14786 transformToApply = transformType != Transformation.TYPE_IDENTITY ? t : null; 14787 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 14788 } 14789 } 14790 } 14791 14792 concatMatrix |= !childHasIdentityMatrix; 14793 14794 // Sets the flag as early as possible to allow draw() implementations 14795 // to call invalidate() successfully when doing animations 14796 mPrivateFlags |= PFLAG_DRAWN; 14797 14798 if (!concatMatrix && 14799 (flags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS | 14800 ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN && 14801 canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 14802 (mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) { 14803 mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED; 14804 return more; 14805 } 14806 mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED; 14807 14808 if (hardwareAccelerated) { 14809 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 14810 // retain the flag's value temporarily in the mRecreateDisplayList flag 14811 mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED; 14812 mPrivateFlags &= ~PFLAG_INVALIDATED; 14813 } 14814 14815 RenderNode renderNode = null; 14816 Bitmap cache = null; 14817 boolean hasDisplayList = false; 14818 if (caching) { 14819 if (!hardwareAccelerated) { 14820 if (layerType != LAYER_TYPE_NONE) { 14821 layerType = LAYER_TYPE_SOFTWARE; 14822 buildDrawingCache(true); 14823 } 14824 cache = getDrawingCache(true); 14825 } else { 14826 switch (layerType) { 14827 case LAYER_TYPE_SOFTWARE: 14828 if (usingRenderNodeProperties) { 14829 hasDisplayList = canHaveDisplayList(); 14830 } else { 14831 buildDrawingCache(true); 14832 cache = getDrawingCache(true); 14833 } 14834 break; 14835 case LAYER_TYPE_HARDWARE: 14836 if (usingRenderNodeProperties) { 14837 hasDisplayList = canHaveDisplayList(); 14838 } 14839 break; 14840 case LAYER_TYPE_NONE: 14841 // Delay getting the display list until animation-driven alpha values are 14842 // set up and possibly passed on to the view 14843 hasDisplayList = canHaveDisplayList(); 14844 break; 14845 } 14846 } 14847 } 14848 usingRenderNodeProperties &= hasDisplayList; 14849 if (usingRenderNodeProperties) { 14850 renderNode = getDisplayList(); 14851 if (!renderNode.isValid()) { 14852 // Uncommon, but possible. If a view is removed from the hierarchy during the call 14853 // to getDisplayList(), the display list will be marked invalid and we should not 14854 // try to use it again. 14855 renderNode = null; 14856 hasDisplayList = false; 14857 usingRenderNodeProperties = false; 14858 } 14859 } 14860 14861 int sx = 0; 14862 int sy = 0; 14863 if (!hasDisplayList) { 14864 computeScroll(); 14865 sx = mScrollX; 14866 sy = mScrollY; 14867 } 14868 14869 final boolean hasNoCache = cache == null || hasDisplayList; 14870 final boolean offsetForScroll = cache == null && !hasDisplayList && 14871 layerType != LAYER_TYPE_HARDWARE; 14872 14873 int restoreTo = -1; 14874 if (!usingRenderNodeProperties || transformToApply != null) { 14875 restoreTo = canvas.save(); 14876 } 14877 if (offsetForScroll) { 14878 canvas.translate(mLeft - sx, mTop - sy); 14879 } else { 14880 if (!usingRenderNodeProperties) { 14881 canvas.translate(mLeft, mTop); 14882 } 14883 if (scalingRequired) { 14884 if (usingRenderNodeProperties) { 14885 // TODO: Might not need this if we put everything inside the DL 14886 restoreTo = canvas.save(); 14887 } 14888 // mAttachInfo cannot be null, otherwise scalingRequired == false 14889 final float scale = 1.0f / mAttachInfo.mApplicationScale; 14890 canvas.scale(scale, scale); 14891 } 14892 } 14893 14894 float alpha = usingRenderNodeProperties ? 1 : (getAlpha() * getTransitionAlpha()); 14895 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || 14896 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 14897 if (transformToApply != null || !childHasIdentityMatrix) { 14898 int transX = 0; 14899 int transY = 0; 14900 14901 if (offsetForScroll) { 14902 transX = -sx; 14903 transY = -sy; 14904 } 14905 14906 if (transformToApply != null) { 14907 if (concatMatrix) { 14908 if (usingRenderNodeProperties) { 14909 renderNode.setAnimationMatrix(transformToApply.getMatrix()); 14910 } else { 14911 // Undo the scroll translation, apply the transformation matrix, 14912 // then redo the scroll translate to get the correct result. 14913 canvas.translate(-transX, -transY); 14914 canvas.concat(transformToApply.getMatrix()); 14915 canvas.translate(transX, transY); 14916 } 14917 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 14918 } 14919 14920 float transformAlpha = transformToApply.getAlpha(); 14921 if (transformAlpha < 1) { 14922 alpha *= transformAlpha; 14923 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 14924 } 14925 } 14926 14927 if (!childHasIdentityMatrix && !usingRenderNodeProperties) { 14928 canvas.translate(-transX, -transY); 14929 canvas.concat(getMatrix()); 14930 canvas.translate(transX, transY); 14931 } 14932 } 14933 14934 // Deal with alpha if it is or used to be <1 14935 if (alpha < 1 || 14936 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 14937 if (alpha < 1) { 14938 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA; 14939 } else { 14940 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA; 14941 } 14942 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 14943 if (hasNoCache) { 14944 final int multipliedAlpha = (int) (255 * alpha); 14945 if (!onSetAlpha(multipliedAlpha)) { 14946 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 14947 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 14948 layerType != LAYER_TYPE_NONE) { 14949 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 14950 } 14951 if (usingRenderNodeProperties) { 14952 renderNode.setAlpha(alpha * getAlpha() * getTransitionAlpha()); 14953 } else if (layerType == LAYER_TYPE_NONE) { 14954 final int scrollX = hasDisplayList ? 0 : sx; 14955 final int scrollY = hasDisplayList ? 0 : sy; 14956 canvas.saveLayerAlpha(scrollX, scrollY, 14957 scrollX + (mRight - mLeft), scrollY + (mBottom - mTop), 14958 multipliedAlpha, layerFlags); 14959 } 14960 } else { 14961 // Alpha is handled by the child directly, clobber the layer's alpha 14962 mPrivateFlags |= PFLAG_ALPHA_SET; 14963 } 14964 } 14965 } 14966 } else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 14967 onSetAlpha(255); 14968 mPrivateFlags &= ~PFLAG_ALPHA_SET; 14969 } 14970 14971 if (!usingRenderNodeProperties) { 14972 // apply clips directly, since RenderNode won't do it for this draw 14973 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN 14974 && cache == null) { 14975 if (offsetForScroll) { 14976 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 14977 } else { 14978 if (!scalingRequired || cache == null) { 14979 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 14980 } else { 14981 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 14982 } 14983 } 14984 } 14985 14986 if (mClipBounds != null) { 14987 // clip bounds ignore scroll 14988 canvas.clipRect(mClipBounds); 14989 } 14990 } 14991 14992 14993 14994 if (!usingRenderNodeProperties && hasDisplayList) { 14995 renderNode = getDisplayList(); 14996 if (!renderNode.isValid()) { 14997 // Uncommon, but possible. If a view is removed from the hierarchy during the call 14998 // to getDisplayList(), the display list will be marked invalid and we should not 14999 // try to use it again. 15000 renderNode = null; 15001 hasDisplayList = false; 15002 } 15003 } 15004 15005 if (hasNoCache) { 15006 boolean layerRendered = false; 15007 if (layerType == LAYER_TYPE_HARDWARE && !usingRenderNodeProperties) { 15008 final HardwareLayer layer = getHardwareLayer(); 15009 if (layer != null && layer.isValid()) { 15010 int restoreAlpha = mLayerPaint.getAlpha(); 15011 mLayerPaint.setAlpha((int) (alpha * 255)); 15012 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 15013 mLayerPaint.setAlpha(restoreAlpha); 15014 layerRendered = true; 15015 } else { 15016 final int scrollX = hasDisplayList ? 0 : sx; 15017 final int scrollY = hasDisplayList ? 0 : sy; 15018 canvas.saveLayer(scrollX, scrollY, 15019 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 15020 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 15021 } 15022 } 15023 15024 if (!layerRendered) { 15025 if (!hasDisplayList) { 15026 // Fast path for layouts with no backgrounds 15027 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 15028 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 15029 dispatchDraw(canvas); 15030 } else { 15031 draw(canvas); 15032 } 15033 } else { 15034 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 15035 ((HardwareCanvas) canvas).drawRenderNode(renderNode, null, flags); 15036 } 15037 } 15038 } else if (cache != null) { 15039 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 15040 Paint cachePaint; 15041 int restoreAlpha = 0; 15042 15043 if (layerType == LAYER_TYPE_NONE) { 15044 cachePaint = parent.mCachePaint; 15045 if (cachePaint == null) { 15046 cachePaint = new Paint(); 15047 cachePaint.setDither(false); 15048 parent.mCachePaint = cachePaint; 15049 } 15050 } else { 15051 cachePaint = mLayerPaint; 15052 restoreAlpha = mLayerPaint.getAlpha(); 15053 } 15054 cachePaint.setAlpha((int) (alpha * 255)); 15055 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 15056 cachePaint.setAlpha(restoreAlpha); 15057 } 15058 15059 if (restoreTo >= 0) { 15060 canvas.restoreToCount(restoreTo); 15061 } 15062 15063 if (a != null && !more) { 15064 if (!hardwareAccelerated && !a.getFillAfter()) { 15065 onSetAlpha(255); 15066 } 15067 parent.finishAnimatingView(this, a); 15068 } 15069 15070 if (more && hardwareAccelerated) { 15071 if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 15072 // alpha animations should cause the child to recreate its display list 15073 invalidate(true); 15074 } 15075 } 15076 15077 mRecreateDisplayList = false; 15078 15079 return more; 15080 } 15081 15082 /** 15083 * Manually render this view (and all of its children) to the given Canvas. 15084 * The view must have already done a full layout before this function is 15085 * called. When implementing a view, implement 15086 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 15087 * If you do need to override this method, call the superclass version. 15088 * 15089 * @param canvas The Canvas to which the View is rendered. 15090 */ 15091 public void draw(Canvas canvas) { 15092 final int privateFlags = mPrivateFlags; 15093 final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE && 15094 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 15095 mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 15096 15097 /* 15098 * Draw traversal performs several drawing steps which must be executed 15099 * in the appropriate order: 15100 * 15101 * 1. Draw the background 15102 * 2. If necessary, save the canvas' layers to prepare for fading 15103 * 3. Draw view's content 15104 * 4. Draw children 15105 * 5. If necessary, draw the fading edges and restore layers 15106 * 6. Draw decorations (scrollbars for instance) 15107 */ 15108 15109 // Step 1, draw the background, if needed 15110 int saveCount; 15111 15112 if (!dirtyOpaque) { 15113 drawBackground(canvas); 15114 } 15115 15116 // skip step 2 & 5 if possible (common case) 15117 final int viewFlags = mViewFlags; 15118 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 15119 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 15120 if (!verticalEdges && !horizontalEdges) { 15121 // Step 3, draw the content 15122 if (!dirtyOpaque) onDraw(canvas); 15123 15124 // Step 4, draw the children 15125 dispatchDraw(canvas); 15126 15127 // Step 6, draw decorations (scrollbars) 15128 onDrawScrollBars(canvas); 15129 15130 if (mOverlay != null && !mOverlay.isEmpty()) { 15131 mOverlay.getOverlayView().dispatchDraw(canvas); 15132 } 15133 15134 // we're done... 15135 return; 15136 } 15137 15138 /* 15139 * Here we do the full fledged routine... 15140 * (this is an uncommon case where speed matters less, 15141 * this is why we repeat some of the tests that have been 15142 * done above) 15143 */ 15144 15145 boolean drawTop = false; 15146 boolean drawBottom = false; 15147 boolean drawLeft = false; 15148 boolean drawRight = false; 15149 15150 float topFadeStrength = 0.0f; 15151 float bottomFadeStrength = 0.0f; 15152 float leftFadeStrength = 0.0f; 15153 float rightFadeStrength = 0.0f; 15154 15155 // Step 2, save the canvas' layers 15156 int paddingLeft = mPaddingLeft; 15157 15158 final boolean offsetRequired = isPaddingOffsetRequired(); 15159 if (offsetRequired) { 15160 paddingLeft += getLeftPaddingOffset(); 15161 } 15162 15163 int left = mScrollX + paddingLeft; 15164 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 15165 int top = mScrollY + getFadeTop(offsetRequired); 15166 int bottom = top + getFadeHeight(offsetRequired); 15167 15168 if (offsetRequired) { 15169 right += getRightPaddingOffset(); 15170 bottom += getBottomPaddingOffset(); 15171 } 15172 15173 final ScrollabilityCache scrollabilityCache = mScrollCache; 15174 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 15175 int length = (int) fadeHeight; 15176 15177 // clip the fade length if top and bottom fades overlap 15178 // overlapping fades produce odd-looking artifacts 15179 if (verticalEdges && (top + length > bottom - length)) { 15180 length = (bottom - top) / 2; 15181 } 15182 15183 // also clip horizontal fades if necessary 15184 if (horizontalEdges && (left + length > right - length)) { 15185 length = (right - left) / 2; 15186 } 15187 15188 if (verticalEdges) { 15189 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 15190 drawTop = topFadeStrength * fadeHeight > 1.0f; 15191 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 15192 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 15193 } 15194 15195 if (horizontalEdges) { 15196 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 15197 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 15198 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 15199 drawRight = rightFadeStrength * fadeHeight > 1.0f; 15200 } 15201 15202 saveCount = canvas.getSaveCount(); 15203 15204 int solidColor = getSolidColor(); 15205 if (solidColor == 0) { 15206 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 15207 15208 if (drawTop) { 15209 canvas.saveLayer(left, top, right, top + length, null, flags); 15210 } 15211 15212 if (drawBottom) { 15213 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 15214 } 15215 15216 if (drawLeft) { 15217 canvas.saveLayer(left, top, left + length, bottom, null, flags); 15218 } 15219 15220 if (drawRight) { 15221 canvas.saveLayer(right - length, top, right, bottom, null, flags); 15222 } 15223 } else { 15224 scrollabilityCache.setFadeColor(solidColor); 15225 } 15226 15227 // Step 3, draw the content 15228 if (!dirtyOpaque) onDraw(canvas); 15229 15230 // Step 4, draw the children 15231 dispatchDraw(canvas); 15232 15233 // Step 5, draw the fade effect and restore layers 15234 final Paint p = scrollabilityCache.paint; 15235 final Matrix matrix = scrollabilityCache.matrix; 15236 final Shader fade = scrollabilityCache.shader; 15237 15238 if (drawTop) { 15239 matrix.setScale(1, fadeHeight * topFadeStrength); 15240 matrix.postTranslate(left, top); 15241 fade.setLocalMatrix(matrix); 15242 p.setShader(fade); 15243 canvas.drawRect(left, top, right, top + length, p); 15244 } 15245 15246 if (drawBottom) { 15247 matrix.setScale(1, fadeHeight * bottomFadeStrength); 15248 matrix.postRotate(180); 15249 matrix.postTranslate(left, bottom); 15250 fade.setLocalMatrix(matrix); 15251 p.setShader(fade); 15252 canvas.drawRect(left, bottom - length, right, bottom, p); 15253 } 15254 15255 if (drawLeft) { 15256 matrix.setScale(1, fadeHeight * leftFadeStrength); 15257 matrix.postRotate(-90); 15258 matrix.postTranslate(left, top); 15259 fade.setLocalMatrix(matrix); 15260 p.setShader(fade); 15261 canvas.drawRect(left, top, left + length, bottom, p); 15262 } 15263 15264 if (drawRight) { 15265 matrix.setScale(1, fadeHeight * rightFadeStrength); 15266 matrix.postRotate(90); 15267 matrix.postTranslate(right, top); 15268 fade.setLocalMatrix(matrix); 15269 p.setShader(fade); 15270 canvas.drawRect(right - length, top, right, bottom, p); 15271 } 15272 15273 canvas.restoreToCount(saveCount); 15274 15275 // Step 6, draw decorations (scrollbars) 15276 onDrawScrollBars(canvas); 15277 15278 if (mOverlay != null && !mOverlay.isEmpty()) { 15279 mOverlay.getOverlayView().dispatchDraw(canvas); 15280 } 15281 } 15282 15283 /** 15284 * Draws the background onto the specified canvas. 15285 * 15286 * @param canvas Canvas on which to draw the background 15287 */ 15288 private void drawBackground(Canvas canvas) { 15289 final Drawable background = mBackground; 15290 if (background == null) { 15291 return; 15292 } 15293 15294 if (mBackgroundSizeChanged) { 15295 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 15296 mBackgroundSizeChanged = false; 15297 mPrivateFlags3 |= PFLAG3_OUTLINE_INVALID; 15298 } 15299 15300 // Attempt to use a display list if requested. 15301 if (canvas.isHardwareAccelerated() && mAttachInfo != null 15302 && mAttachInfo.mHardwareRenderer != null) { 15303 mBackgroundRenderNode = getDrawableRenderNode(background, mBackgroundRenderNode); 15304 15305 final RenderNode displayList = mBackgroundRenderNode; 15306 if (displayList != null && displayList.isValid()) { 15307 setBackgroundDisplayListProperties(displayList); 15308 ((HardwareCanvas) canvas).drawRenderNode(displayList); 15309 return; 15310 } 15311 } 15312 15313 final int scrollX = mScrollX; 15314 final int scrollY = mScrollY; 15315 if ((scrollX | scrollY) == 0) { 15316 background.draw(canvas); 15317 } else { 15318 canvas.translate(scrollX, scrollY); 15319 background.draw(canvas); 15320 canvas.translate(-scrollX, -scrollY); 15321 } 15322 } 15323 15324 /** 15325 * Set up background drawable display list properties. 15326 * 15327 * @param displayList Valid display list for the background drawable 15328 */ 15329 private void setBackgroundDisplayListProperties(RenderNode displayList) { 15330 displayList.setTranslationX(mScrollX); 15331 displayList.setTranslationY(mScrollY); 15332 } 15333 15334 /** 15335 * Creates a new display list or updates the existing display list for the 15336 * specified Drawable. 15337 * 15338 * @param drawable Drawable for which to create a display list 15339 * @param renderNode Existing RenderNode, or {@code null} 15340 * @return A valid display list for the specified drawable 15341 */ 15342 private RenderNode getDrawableRenderNode(Drawable drawable, RenderNode renderNode) { 15343 if (renderNode == null) { 15344 renderNode = RenderNode.create(drawable.getClass().getName(), this); 15345 } 15346 15347 final Rect bounds = drawable.getBounds(); 15348 final int width = bounds.width(); 15349 final int height = bounds.height(); 15350 final HardwareCanvas canvas = renderNode.start(width, height); 15351 try { 15352 drawable.draw(canvas); 15353 } finally { 15354 renderNode.end(canvas); 15355 } 15356 15357 // Set up drawable properties that are view-independent. 15358 renderNode.setLeftTopRightBottom(bounds.left, bounds.top, bounds.right, bounds.bottom); 15359 renderNode.setProjectBackwards(drawable.isProjected()); 15360 renderNode.setProjectionReceiver(true); 15361 renderNode.setClipToBounds(false); 15362 return renderNode; 15363 } 15364 15365 /** 15366 * Returns the overlay for this view, creating it if it does not yet exist. 15367 * Adding drawables to the overlay will cause them to be displayed whenever 15368 * the view itself is redrawn. Objects in the overlay should be actively 15369 * managed: remove them when they should not be displayed anymore. The 15370 * overlay will always have the same size as its host view. 15371 * 15372 * <p>Note: Overlays do not currently work correctly with {@link 15373 * SurfaceView} or {@link TextureView}; contents in overlays for these 15374 * types of views may not display correctly.</p> 15375 * 15376 * @return The ViewOverlay object for this view. 15377 * @see ViewOverlay 15378 */ 15379 public ViewOverlay getOverlay() { 15380 if (mOverlay == null) { 15381 mOverlay = new ViewOverlay(mContext, this); 15382 } 15383 return mOverlay; 15384 } 15385 15386 /** 15387 * Override this if your view is known to always be drawn on top of a solid color background, 15388 * and needs to draw fading edges. Returning a non-zero color enables the view system to 15389 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 15390 * should be set to 0xFF. 15391 * 15392 * @see #setVerticalFadingEdgeEnabled(boolean) 15393 * @see #setHorizontalFadingEdgeEnabled(boolean) 15394 * 15395 * @return The known solid color background for this view, or 0 if the color may vary 15396 */ 15397 @ViewDebug.ExportedProperty(category = "drawing") 15398 public int getSolidColor() { 15399 return 0; 15400 } 15401 15402 /** 15403 * Build a human readable string representation of the specified view flags. 15404 * 15405 * @param flags the view flags to convert to a string 15406 * @return a String representing the supplied flags 15407 */ 15408 private static String printFlags(int flags) { 15409 String output = ""; 15410 int numFlags = 0; 15411 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 15412 output += "TAKES_FOCUS"; 15413 numFlags++; 15414 } 15415 15416 switch (flags & VISIBILITY_MASK) { 15417 case INVISIBLE: 15418 if (numFlags > 0) { 15419 output += " "; 15420 } 15421 output += "INVISIBLE"; 15422 // USELESS HERE numFlags++; 15423 break; 15424 case GONE: 15425 if (numFlags > 0) { 15426 output += " "; 15427 } 15428 output += "GONE"; 15429 // USELESS HERE numFlags++; 15430 break; 15431 default: 15432 break; 15433 } 15434 return output; 15435 } 15436 15437 /** 15438 * Build a human readable string representation of the specified private 15439 * view flags. 15440 * 15441 * @param privateFlags the private view flags to convert to a string 15442 * @return a String representing the supplied flags 15443 */ 15444 private static String printPrivateFlags(int privateFlags) { 15445 String output = ""; 15446 int numFlags = 0; 15447 15448 if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) { 15449 output += "WANTS_FOCUS"; 15450 numFlags++; 15451 } 15452 15453 if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) { 15454 if (numFlags > 0) { 15455 output += " "; 15456 } 15457 output += "FOCUSED"; 15458 numFlags++; 15459 } 15460 15461 if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) { 15462 if (numFlags > 0) { 15463 output += " "; 15464 } 15465 output += "SELECTED"; 15466 numFlags++; 15467 } 15468 15469 if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) { 15470 if (numFlags > 0) { 15471 output += " "; 15472 } 15473 output += "IS_ROOT_NAMESPACE"; 15474 numFlags++; 15475 } 15476 15477 if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) { 15478 if (numFlags > 0) { 15479 output += " "; 15480 } 15481 output += "HAS_BOUNDS"; 15482 numFlags++; 15483 } 15484 15485 if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) { 15486 if (numFlags > 0) { 15487 output += " "; 15488 } 15489 output += "DRAWN"; 15490 // USELESS HERE numFlags++; 15491 } 15492 return output; 15493 } 15494 15495 /** 15496 * <p>Indicates whether or not this view's layout will be requested during 15497 * the next hierarchy layout pass.</p> 15498 * 15499 * @return true if the layout will be forced during next layout pass 15500 */ 15501 public boolean isLayoutRequested() { 15502 return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT; 15503 } 15504 15505 /** 15506 * Return true if o is a ViewGroup that is laying out using optical bounds. 15507 * @hide 15508 */ 15509 public static boolean isLayoutModeOptical(Object o) { 15510 return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical(); 15511 } 15512 15513 private boolean setOpticalFrame(int left, int top, int right, int bottom) { 15514 Insets parentInsets = mParent instanceof View ? 15515 ((View) mParent).getOpticalInsets() : Insets.NONE; 15516 Insets childInsets = getOpticalInsets(); 15517 return setFrame( 15518 left + parentInsets.left - childInsets.left, 15519 top + parentInsets.top - childInsets.top, 15520 right + parentInsets.left + childInsets.right, 15521 bottom + parentInsets.top + childInsets.bottom); 15522 } 15523 15524 /** 15525 * Assign a size and position to a view and all of its 15526 * descendants 15527 * 15528 * <p>This is the second phase of the layout mechanism. 15529 * (The first is measuring). In this phase, each parent calls 15530 * layout on all of its children to position them. 15531 * This is typically done using the child measurements 15532 * that were stored in the measure pass().</p> 15533 * 15534 * <p>Derived classes should not override this method. 15535 * Derived classes with children should override 15536 * onLayout. In that method, they should 15537 * call layout on each of their children.</p> 15538 * 15539 * @param l Left position, relative to parent 15540 * @param t Top position, relative to parent 15541 * @param r Right position, relative to parent 15542 * @param b Bottom position, relative to parent 15543 */ 15544 @SuppressWarnings({"unchecked"}) 15545 public void layout(int l, int t, int r, int b) { 15546 if ((mPrivateFlags3 & PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT) != 0) { 15547 onMeasure(mOldWidthMeasureSpec, mOldHeightMeasureSpec); 15548 mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 15549 } 15550 15551 int oldL = mLeft; 15552 int oldT = mTop; 15553 int oldB = mBottom; 15554 int oldR = mRight; 15555 15556 boolean changed = isLayoutModeOptical(mParent) ? 15557 setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b); 15558 15559 if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) { 15560 onLayout(changed, l, t, r, b); 15561 mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED; 15562 15563 ListenerInfo li = mListenerInfo; 15564 if (li != null && li.mOnLayoutChangeListeners != null) { 15565 ArrayList<OnLayoutChangeListener> listenersCopy = 15566 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 15567 int numListeners = listenersCopy.size(); 15568 for (int i = 0; i < numListeners; ++i) { 15569 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 15570 } 15571 } 15572 } 15573 15574 mPrivateFlags &= ~PFLAG_FORCE_LAYOUT; 15575 mPrivateFlags3 |= PFLAG3_IS_LAID_OUT; 15576 } 15577 15578 /** 15579 * Called from layout when this view should 15580 * assign a size and position to each of its children. 15581 * 15582 * Derived classes with children should override 15583 * this method and call layout on each of 15584 * their children. 15585 * @param changed This is a new size or position for this view 15586 * @param left Left position, relative to parent 15587 * @param top Top position, relative to parent 15588 * @param right Right position, relative to parent 15589 * @param bottom Bottom position, relative to parent 15590 */ 15591 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 15592 } 15593 15594 /** 15595 * Assign a size and position to this view. 15596 * 15597 * This is called from layout. 15598 * 15599 * @param left Left position, relative to parent 15600 * @param top Top position, relative to parent 15601 * @param right Right position, relative to parent 15602 * @param bottom Bottom position, relative to parent 15603 * @return true if the new size and position are different than the 15604 * previous ones 15605 * {@hide} 15606 */ 15607 protected boolean setFrame(int left, int top, int right, int bottom) { 15608 boolean changed = false; 15609 15610 if (DBG) { 15611 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 15612 + right + "," + bottom + ")"); 15613 } 15614 15615 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 15616 changed = true; 15617 15618 // Remember our drawn bit 15619 int drawn = mPrivateFlags & PFLAG_DRAWN; 15620 15621 int oldWidth = mRight - mLeft; 15622 int oldHeight = mBottom - mTop; 15623 int newWidth = right - left; 15624 int newHeight = bottom - top; 15625 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 15626 15627 // Invalidate our old position 15628 invalidate(sizeChanged); 15629 15630 mLeft = left; 15631 mTop = top; 15632 mRight = right; 15633 mBottom = bottom; 15634 mRenderNode.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 15635 15636 mPrivateFlags |= PFLAG_HAS_BOUNDS; 15637 15638 15639 if (sizeChanged) { 15640 sizeChange(newWidth, newHeight, oldWidth, oldHeight); 15641 } 15642 15643 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE || mGhostView != null) { 15644 // If we are visible, force the DRAWN bit to on so that 15645 // this invalidate will go through (at least to our parent). 15646 // This is because someone may have invalidated this view 15647 // before this call to setFrame came in, thereby clearing 15648 // the DRAWN bit. 15649 mPrivateFlags |= PFLAG_DRAWN; 15650 invalidate(sizeChanged); 15651 // parent display list may need to be recreated based on a change in the bounds 15652 // of any child 15653 invalidateParentCaches(); 15654 } 15655 15656 // Reset drawn bit to original value (invalidate turns it off) 15657 mPrivateFlags |= drawn; 15658 15659 mBackgroundSizeChanged = true; 15660 15661 notifySubtreeAccessibilityStateChangedIfNeeded(); 15662 } 15663 return changed; 15664 } 15665 15666 /** 15667 * Same as setFrame, but public and hidden. For use in {@link android.transition.ChangeBounds}. 15668 * @hide 15669 */ 15670 public void setLeftTopRightBottom(int left, int top, int right, int bottom) { 15671 setFrame(left, top, right, bottom); 15672 } 15673 15674 private void sizeChange(int newWidth, int newHeight, int oldWidth, int oldHeight) { 15675 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 15676 if (mOverlay != null) { 15677 mOverlay.getOverlayView().setRight(newWidth); 15678 mOverlay.getOverlayView().setBottom(newHeight); 15679 } 15680 mPrivateFlags3 |= PFLAG3_OUTLINE_INVALID; 15681 } 15682 15683 /** 15684 * Finalize inflating a view from XML. This is called as the last phase 15685 * of inflation, after all child views have been added. 15686 * 15687 * <p>Even if the subclass overrides onFinishInflate, they should always be 15688 * sure to call the super method, so that we get called. 15689 */ 15690 protected void onFinishInflate() { 15691 } 15692 15693 /** 15694 * Returns the resources associated with this view. 15695 * 15696 * @return Resources object. 15697 */ 15698 public Resources getResources() { 15699 return mResources; 15700 } 15701 15702 /** 15703 * Invalidates the specified Drawable. 15704 * 15705 * @param drawable the drawable to invalidate 15706 */ 15707 @Override 15708 public void invalidateDrawable(@NonNull Drawable drawable) { 15709 if (verifyDrawable(drawable)) { 15710 final Rect dirty = drawable.getDirtyBounds(); 15711 final int scrollX = mScrollX; 15712 final int scrollY = mScrollY; 15713 15714 invalidate(dirty.left + scrollX, dirty.top + scrollY, 15715 dirty.right + scrollX, dirty.bottom + scrollY); 15716 15717 mPrivateFlags3 |= PFLAG3_OUTLINE_INVALID; 15718 } 15719 } 15720 15721 /** 15722 * Schedules an action on a drawable to occur at a specified time. 15723 * 15724 * @param who the recipient of the action 15725 * @param what the action to run on the drawable 15726 * @param when the time at which the action must occur. Uses the 15727 * {@link SystemClock#uptimeMillis} timebase. 15728 */ 15729 @Override 15730 public void scheduleDrawable(Drawable who, Runnable what, long when) { 15731 if (verifyDrawable(who) && what != null) { 15732 final long delay = when - SystemClock.uptimeMillis(); 15733 if (mAttachInfo != null) { 15734 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 15735 Choreographer.CALLBACK_ANIMATION, what, who, 15736 Choreographer.subtractFrameDelay(delay)); 15737 } else { 15738 ViewRootImpl.getRunQueue().postDelayed(what, delay); 15739 } 15740 } 15741 } 15742 15743 /** 15744 * Cancels a scheduled action on a drawable. 15745 * 15746 * @param who the recipient of the action 15747 * @param what the action to cancel 15748 */ 15749 @Override 15750 public void unscheduleDrawable(Drawable who, Runnable what) { 15751 if (verifyDrawable(who) && what != null) { 15752 if (mAttachInfo != null) { 15753 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 15754 Choreographer.CALLBACK_ANIMATION, what, who); 15755 } 15756 ViewRootImpl.getRunQueue().removeCallbacks(what); 15757 } 15758 } 15759 15760 /** 15761 * Unschedule any events associated with the given Drawable. This can be 15762 * used when selecting a new Drawable into a view, so that the previous 15763 * one is completely unscheduled. 15764 * 15765 * @param who The Drawable to unschedule. 15766 * 15767 * @see #drawableStateChanged 15768 */ 15769 public void unscheduleDrawable(Drawable who) { 15770 if (mAttachInfo != null && who != null) { 15771 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 15772 Choreographer.CALLBACK_ANIMATION, null, who); 15773 } 15774 } 15775 15776 /** 15777 * Resolve the Drawables depending on the layout direction. This is implicitly supposing 15778 * that the View directionality can and will be resolved before its Drawables. 15779 * 15780 * Will call {@link View#onResolveDrawables} when resolution is done. 15781 * 15782 * @hide 15783 */ 15784 protected void resolveDrawables() { 15785 // Drawables resolution may need to happen before resolving the layout direction (which is 15786 // done only during the measure() call). 15787 // If the layout direction is not resolved yet, we cannot resolve the Drawables except in 15788 // one case: when the raw layout direction has not been defined as LAYOUT_DIRECTION_INHERIT. 15789 // So, if the raw layout direction is LAYOUT_DIRECTION_LTR or LAYOUT_DIRECTION_RTL or 15790 // LAYOUT_DIRECTION_LOCALE, we can "cheat" and we don't need to wait for the layout 15791 // direction to be resolved as its resolved value will be the same as its raw value. 15792 if (!isLayoutDirectionResolved() && 15793 getRawLayoutDirection() == View.LAYOUT_DIRECTION_INHERIT) { 15794 return; 15795 } 15796 15797 final int layoutDirection = isLayoutDirectionResolved() ? 15798 getLayoutDirection() : getRawLayoutDirection(); 15799 15800 if (mBackground != null) { 15801 mBackground.setLayoutDirection(layoutDirection); 15802 } 15803 mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED; 15804 onResolveDrawables(layoutDirection); 15805 } 15806 15807 /** 15808 * Called when layout direction has been resolved. 15809 * 15810 * The default implementation does nothing. 15811 * 15812 * @param layoutDirection The resolved layout direction. 15813 * 15814 * @see #LAYOUT_DIRECTION_LTR 15815 * @see #LAYOUT_DIRECTION_RTL 15816 * 15817 * @hide 15818 */ 15819 public void onResolveDrawables(@ResolvedLayoutDir int layoutDirection) { 15820 } 15821 15822 /** 15823 * @hide 15824 */ 15825 protected void resetResolvedDrawables() { 15826 mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED; 15827 } 15828 15829 private boolean isDrawablesResolved() { 15830 return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED; 15831 } 15832 15833 /** 15834 * If your view subclass is displaying its own Drawable objects, it should 15835 * override this function and return true for any Drawable it is 15836 * displaying. This allows animations for those drawables to be 15837 * scheduled. 15838 * 15839 * <p>Be sure to call through to the super class when overriding this 15840 * function. 15841 * 15842 * @param who The Drawable to verify. Return true if it is one you are 15843 * displaying, else return the result of calling through to the 15844 * super class. 15845 * 15846 * @return boolean If true than the Drawable is being displayed in the 15847 * view; else false and it is not allowed to animate. 15848 * 15849 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 15850 * @see #drawableStateChanged() 15851 */ 15852 protected boolean verifyDrawable(Drawable who) { 15853 return who == mBackground; 15854 } 15855 15856 /** 15857 * This function is called whenever the state of the view changes in such 15858 * a way that it impacts the state of drawables being shown. 15859 * <p> 15860 * If the View has a StateListAnimator, it will also be called to run necessary state 15861 * change animations. 15862 * <p> 15863 * Be sure to call through to the superclass when overriding this function. 15864 * 15865 * @see Drawable#setState(int[]) 15866 */ 15867 protected void drawableStateChanged() { 15868 final Drawable d = mBackground; 15869 if (d != null && d.isStateful()) { 15870 d.setState(getDrawableState()); 15871 } 15872 15873 if (mStateListAnimator != null) { 15874 mStateListAnimator.setState(getDrawableState()); 15875 } 15876 } 15877 15878 /** 15879 * This function is called whenever the view hotspot changes and needs to 15880 * be propagated to drawables managed by the view. 15881 * <p> 15882 * Be sure to call through to the superclass when overriding this function. 15883 * 15884 * @param x hotspot x coordinate 15885 * @param y hotspot y coordinate 15886 */ 15887 public void drawableHotspotChanged(float x, float y) { 15888 if (mBackground != null) { 15889 mBackground.setHotspot(x, y); 15890 } 15891 } 15892 15893 /** 15894 * Call this to force a view to update its drawable state. This will cause 15895 * drawableStateChanged to be called on this view. Views that are interested 15896 * in the new state should call getDrawableState. 15897 * 15898 * @see #drawableStateChanged 15899 * @see #getDrawableState 15900 */ 15901 public void refreshDrawableState() { 15902 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 15903 drawableStateChanged(); 15904 15905 ViewParent parent = mParent; 15906 if (parent != null) { 15907 parent.childDrawableStateChanged(this); 15908 } 15909 } 15910 15911 /** 15912 * Return an array of resource IDs of the drawable states representing the 15913 * current state of the view. 15914 * 15915 * @return The current drawable state 15916 * 15917 * @see Drawable#setState(int[]) 15918 * @see #drawableStateChanged() 15919 * @see #onCreateDrawableState(int) 15920 */ 15921 public final int[] getDrawableState() { 15922 if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) { 15923 return mDrawableState; 15924 } else { 15925 mDrawableState = onCreateDrawableState(0); 15926 mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY; 15927 return mDrawableState; 15928 } 15929 } 15930 15931 /** 15932 * Generate the new {@link android.graphics.drawable.Drawable} state for 15933 * this view. This is called by the view 15934 * system when the cached Drawable state is determined to be invalid. To 15935 * retrieve the current state, you should use {@link #getDrawableState}. 15936 * 15937 * @param extraSpace if non-zero, this is the number of extra entries you 15938 * would like in the returned array in which you can place your own 15939 * states. 15940 * 15941 * @return Returns an array holding the current {@link Drawable} state of 15942 * the view. 15943 * 15944 * @see #mergeDrawableStates(int[], int[]) 15945 */ 15946 protected int[] onCreateDrawableState(int extraSpace) { 15947 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 15948 mParent instanceof View) { 15949 return ((View) mParent).onCreateDrawableState(extraSpace); 15950 } 15951 15952 int[] drawableState; 15953 15954 int privateFlags = mPrivateFlags; 15955 15956 int viewStateIndex = 0; 15957 if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 15958 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 15959 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 15960 if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 15961 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 15962 if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 15963 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 15964 HardwareRenderer.isAvailable()) { 15965 // This is set if HW acceleration is requested, even if the current 15966 // process doesn't allow it. This is just to allow app preview 15967 // windows to better match their app. 15968 viewStateIndex |= VIEW_STATE_ACCELERATED; 15969 } 15970 if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 15971 15972 final int privateFlags2 = mPrivateFlags2; 15973 if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 15974 if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 15975 15976 drawableState = VIEW_STATE_SETS[viewStateIndex]; 15977 15978 //noinspection ConstantIfStatement 15979 if (false) { 15980 Log.i("View", "drawableStateIndex=" + viewStateIndex); 15981 Log.i("View", toString() 15982 + " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0) 15983 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 15984 + " fo=" + hasFocus() 15985 + " sl=" + ((privateFlags & PFLAG_SELECTED) != 0) 15986 + " wf=" + hasWindowFocus() 15987 + ": " + Arrays.toString(drawableState)); 15988 } 15989 15990 if (extraSpace == 0) { 15991 return drawableState; 15992 } 15993 15994 final int[] fullState; 15995 if (drawableState != null) { 15996 fullState = new int[drawableState.length + extraSpace]; 15997 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 15998 } else { 15999 fullState = new int[extraSpace]; 16000 } 16001 16002 return fullState; 16003 } 16004 16005 /** 16006 * Merge your own state values in <var>additionalState</var> into the base 16007 * state values <var>baseState</var> that were returned by 16008 * {@link #onCreateDrawableState(int)}. 16009 * 16010 * @param baseState The base state values returned by 16011 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 16012 * own additional state values. 16013 * 16014 * @param additionalState The additional state values you would like 16015 * added to <var>baseState</var>; this array is not modified. 16016 * 16017 * @return As a convenience, the <var>baseState</var> array you originally 16018 * passed into the function is returned. 16019 * 16020 * @see #onCreateDrawableState(int) 16021 */ 16022 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 16023 final int N = baseState.length; 16024 int i = N - 1; 16025 while (i >= 0 && baseState[i] == 0) { 16026 i--; 16027 } 16028 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 16029 return baseState; 16030 } 16031 16032 /** 16033 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 16034 * on all Drawable objects associated with this view. 16035 * <p> 16036 * Also calls {@link StateListAnimator#jumpToCurrentState()} if there is a StateListAnimator 16037 * attached to this view. 16038 */ 16039 public void jumpDrawablesToCurrentState() { 16040 if (mBackground != null) { 16041 mBackground.jumpToCurrentState(); 16042 } 16043 if (mStateListAnimator != null) { 16044 mStateListAnimator.jumpToCurrentState(); 16045 } 16046 } 16047 16048 /** 16049 * Sets the background color for this view. 16050 * @param color the color of the background 16051 */ 16052 @RemotableViewMethod 16053 public void setBackgroundColor(int color) { 16054 if (mBackground instanceof ColorDrawable) { 16055 ((ColorDrawable) mBackground.mutate()).setColor(color); 16056 computeOpaqueFlags(); 16057 mBackgroundResource = 0; 16058 } else { 16059 setBackground(new ColorDrawable(color)); 16060 } 16061 } 16062 16063 /** 16064 * Set the background to a given resource. The resource should refer to 16065 * a Drawable object or 0 to remove the background. 16066 * @param resid The identifier of the resource. 16067 * 16068 * @attr ref android.R.styleable#View_background 16069 */ 16070 @RemotableViewMethod 16071 public void setBackgroundResource(int resid) { 16072 if (resid != 0 && resid == mBackgroundResource) { 16073 return; 16074 } 16075 16076 Drawable d = null; 16077 if (resid != 0) { 16078 d = mContext.getDrawable(resid); 16079 } 16080 setBackground(d); 16081 16082 mBackgroundResource = resid; 16083 } 16084 16085 /** 16086 * Set the background to a given Drawable, or remove the background. If the 16087 * background has padding, this View's padding is set to the background's 16088 * padding. However, when a background is removed, this View's padding isn't 16089 * touched. If setting the padding is desired, please use 16090 * {@link #setPadding(int, int, int, int)}. 16091 * 16092 * @param background The Drawable to use as the background, or null to remove the 16093 * background 16094 */ 16095 public void setBackground(Drawable background) { 16096 //noinspection deprecation 16097 setBackgroundDrawable(background); 16098 } 16099 16100 /** 16101 * @deprecated use {@link #setBackground(Drawable)} instead 16102 */ 16103 @Deprecated 16104 public void setBackgroundDrawable(Drawable background) { 16105 computeOpaqueFlags(); 16106 16107 if (background == mBackground) { 16108 return; 16109 } 16110 16111 boolean requestLayout = false; 16112 16113 mBackgroundResource = 0; 16114 16115 /* 16116 * Regardless of whether we're setting a new background or not, we want 16117 * to clear the previous drawable. 16118 */ 16119 if (mBackground != null) { 16120 mBackground.setCallback(null); 16121 unscheduleDrawable(mBackground); 16122 } 16123 16124 if (background != null) { 16125 Rect padding = sThreadLocal.get(); 16126 if (padding == null) { 16127 padding = new Rect(); 16128 sThreadLocal.set(padding); 16129 } 16130 resetResolvedDrawables(); 16131 background.setLayoutDirection(getLayoutDirection()); 16132 if (background.getPadding(padding)) { 16133 resetResolvedPadding(); 16134 switch (background.getLayoutDirection()) { 16135 case LAYOUT_DIRECTION_RTL: 16136 mUserPaddingLeftInitial = padding.right; 16137 mUserPaddingRightInitial = padding.left; 16138 internalSetPadding(padding.right, padding.top, padding.left, padding.bottom); 16139 break; 16140 case LAYOUT_DIRECTION_LTR: 16141 default: 16142 mUserPaddingLeftInitial = padding.left; 16143 mUserPaddingRightInitial = padding.right; 16144 internalSetPadding(padding.left, padding.top, padding.right, padding.bottom); 16145 } 16146 mLeftPaddingDefined = false; 16147 mRightPaddingDefined = false; 16148 } 16149 16150 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 16151 // if it has a different minimum size, we should layout again 16152 if (mBackground == null 16153 || mBackground.getMinimumHeight() != background.getMinimumHeight() 16154 || mBackground.getMinimumWidth() != background.getMinimumWidth()) { 16155 requestLayout = true; 16156 } 16157 16158 background.setCallback(this); 16159 if (background.isStateful()) { 16160 background.setState(getDrawableState()); 16161 } 16162 background.setVisible(getVisibility() == VISIBLE, false); 16163 mBackground = background; 16164 16165 applyBackgroundTint(); 16166 16167 if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) { 16168 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 16169 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 16170 requestLayout = true; 16171 } 16172 } else { 16173 /* Remove the background */ 16174 mBackground = null; 16175 16176 if ((mPrivateFlags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0) { 16177 /* 16178 * This view ONLY drew the background before and we're removing 16179 * the background, so now it won't draw anything 16180 * (hence we SKIP_DRAW) 16181 */ 16182 mPrivateFlags &= ~PFLAG_ONLY_DRAWS_BACKGROUND; 16183 mPrivateFlags |= PFLAG_SKIP_DRAW; 16184 } 16185 16186 /* 16187 * When the background is set, we try to apply its padding to this 16188 * View. When the background is removed, we don't touch this View's 16189 * padding. This is noted in the Javadocs. Hence, we don't need to 16190 * requestLayout(), the invalidate() below is sufficient. 16191 */ 16192 16193 // The old background's minimum size could have affected this 16194 // View's layout, so let's requestLayout 16195 requestLayout = true; 16196 } 16197 16198 computeOpaqueFlags(); 16199 16200 if (requestLayout) { 16201 requestLayout(); 16202 } 16203 16204 mBackgroundSizeChanged = true; 16205 invalidate(true); 16206 } 16207 16208 /** 16209 * Gets the background drawable 16210 * 16211 * @return The drawable used as the background for this view, if any. 16212 * 16213 * @see #setBackground(Drawable) 16214 * 16215 * @attr ref android.R.styleable#View_background 16216 */ 16217 public Drawable getBackground() { 16218 return mBackground; 16219 } 16220 16221 /** 16222 * Applies a tint to the background drawable. Does not modify the current tint 16223 * mode, which is {@link PorterDuff.Mode#SRC_IN} by default. 16224 * <p> 16225 * Subsequent calls to {@link #setBackground(Drawable)} will automatically 16226 * mutate the drawable and apply the specified tint and tint mode using 16227 * {@link Drawable#setTintList(ColorStateList)}. 16228 * 16229 * @param tint the tint to apply, may be {@code null} to clear tint 16230 * 16231 * @attr ref android.R.styleable#View_backgroundTint 16232 * @see #getBackgroundTintList() 16233 * @see Drawable#setTintList(ColorStateList) 16234 */ 16235 public void setBackgroundTintList(@Nullable ColorStateList tint) { 16236 if (mBackgroundTint == null) { 16237 mBackgroundTint = new TintInfo(); 16238 } 16239 mBackgroundTint.mTintList = tint; 16240 mBackgroundTint.mHasTintList = true; 16241 16242 applyBackgroundTint(); 16243 } 16244 16245 /** 16246 * Return the tint applied to the background drawable, if specified. 16247 * 16248 * @return the tint applied to the background drawable 16249 * @attr ref android.R.styleable#View_backgroundTint 16250 * @see #setBackgroundTintList(ColorStateList) 16251 */ 16252 @Nullable 16253 public ColorStateList getBackgroundTintList() { 16254 return mBackgroundTint != null ? mBackgroundTint.mTintList : null; 16255 } 16256 16257 /** 16258 * Specifies the blending mode used to apply the tint specified by 16259 * {@link #setBackgroundTintList(ColorStateList)}} to the background 16260 * drawable. The default mode is {@link PorterDuff.Mode#SRC_IN}. 16261 * 16262 * @param tintMode the blending mode used to apply the tint, may be 16263 * {@code null} to clear tint 16264 * @attr ref android.R.styleable#View_backgroundTintMode 16265 * @see #getBackgroundTintMode() 16266 * @see Drawable#setTintMode(PorterDuff.Mode) 16267 */ 16268 public void setBackgroundTintMode(@Nullable PorterDuff.Mode tintMode) { 16269 if (mBackgroundTint == null) { 16270 mBackgroundTint = new TintInfo(); 16271 } 16272 mBackgroundTint.mTintMode = tintMode; 16273 mBackgroundTint.mHasTintMode = true; 16274 16275 applyBackgroundTint(); 16276 } 16277 16278 /** 16279 * Return the blending mode used to apply the tint to the background 16280 * drawable, if specified. 16281 * 16282 * @return the blending mode used to apply the tint to the background 16283 * drawable 16284 * @attr ref android.R.styleable#View_backgroundTintMode 16285 * @see #setBackgroundTintMode(PorterDuff.Mode) 16286 */ 16287 @Nullable 16288 public PorterDuff.Mode getBackgroundTintMode() { 16289 return mBackgroundTint != null ? mBackgroundTint.mTintMode : null; 16290 } 16291 16292 private void applyBackgroundTint() { 16293 if (mBackground != null && mBackgroundTint != null) { 16294 final TintInfo tintInfo = mBackgroundTint; 16295 if (tintInfo.mHasTintList || tintInfo.mHasTintMode) { 16296 mBackground = mBackground.mutate(); 16297 16298 if (tintInfo.mHasTintList) { 16299 mBackground.setTintList(tintInfo.mTintList); 16300 } 16301 16302 if (tintInfo.mHasTintMode) { 16303 mBackground.setTintMode(tintInfo.mTintMode); 16304 } 16305 16306 // The drawable (or one of its children) may not have been 16307 // stateful before applying the tint, so let's try again. 16308 if (mBackground.isStateful()) { 16309 mBackground.setState(getDrawableState()); 16310 } 16311 } 16312 } 16313 } 16314 16315 /** 16316 * Sets the padding. The view may add on the space required to display 16317 * the scrollbars, depending on the style and visibility of the scrollbars. 16318 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 16319 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 16320 * from the values set in this call. 16321 * 16322 * @attr ref android.R.styleable#View_padding 16323 * @attr ref android.R.styleable#View_paddingBottom 16324 * @attr ref android.R.styleable#View_paddingLeft 16325 * @attr ref android.R.styleable#View_paddingRight 16326 * @attr ref android.R.styleable#View_paddingTop 16327 * @param left the left padding in pixels 16328 * @param top the top padding in pixels 16329 * @param right the right padding in pixels 16330 * @param bottom the bottom padding in pixels 16331 */ 16332 public void setPadding(int left, int top, int right, int bottom) { 16333 resetResolvedPadding(); 16334 16335 mUserPaddingStart = UNDEFINED_PADDING; 16336 mUserPaddingEnd = UNDEFINED_PADDING; 16337 16338 mUserPaddingLeftInitial = left; 16339 mUserPaddingRightInitial = right; 16340 16341 mLeftPaddingDefined = true; 16342 mRightPaddingDefined = true; 16343 16344 internalSetPadding(left, top, right, bottom); 16345 } 16346 16347 /** 16348 * @hide 16349 */ 16350 protected void internalSetPadding(int left, int top, int right, int bottom) { 16351 mUserPaddingLeft = left; 16352 mUserPaddingRight = right; 16353 mUserPaddingBottom = bottom; 16354 16355 final int viewFlags = mViewFlags; 16356 boolean changed = false; 16357 16358 // Common case is there are no scroll bars. 16359 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 16360 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 16361 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 16362 ? 0 : getVerticalScrollbarWidth(); 16363 switch (mVerticalScrollbarPosition) { 16364 case SCROLLBAR_POSITION_DEFAULT: 16365 if (isLayoutRtl()) { 16366 left += offset; 16367 } else { 16368 right += offset; 16369 } 16370 break; 16371 case SCROLLBAR_POSITION_RIGHT: 16372 right += offset; 16373 break; 16374 case SCROLLBAR_POSITION_LEFT: 16375 left += offset; 16376 break; 16377 } 16378 } 16379 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 16380 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 16381 ? 0 : getHorizontalScrollbarHeight(); 16382 } 16383 } 16384 16385 if (mPaddingLeft != left) { 16386 changed = true; 16387 mPaddingLeft = left; 16388 } 16389 if (mPaddingTop != top) { 16390 changed = true; 16391 mPaddingTop = top; 16392 } 16393 if (mPaddingRight != right) { 16394 changed = true; 16395 mPaddingRight = right; 16396 } 16397 if (mPaddingBottom != bottom) { 16398 changed = true; 16399 mPaddingBottom = bottom; 16400 } 16401 16402 if (changed) { 16403 requestLayout(); 16404 } 16405 } 16406 16407 /** 16408 * Sets the relative padding. The view may add on the space required to display 16409 * the scrollbars, depending on the style and visibility of the scrollbars. 16410 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 16411 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 16412 * from the values set in this call. 16413 * 16414 * @attr ref android.R.styleable#View_padding 16415 * @attr ref android.R.styleable#View_paddingBottom 16416 * @attr ref android.R.styleable#View_paddingStart 16417 * @attr ref android.R.styleable#View_paddingEnd 16418 * @attr ref android.R.styleable#View_paddingTop 16419 * @param start the start padding in pixels 16420 * @param top the top padding in pixels 16421 * @param end the end padding in pixels 16422 * @param bottom the bottom padding in pixels 16423 */ 16424 public void setPaddingRelative(int start, int top, int end, int bottom) { 16425 resetResolvedPadding(); 16426 16427 mUserPaddingStart = start; 16428 mUserPaddingEnd = end; 16429 mLeftPaddingDefined = true; 16430 mRightPaddingDefined = true; 16431 16432 switch(getLayoutDirection()) { 16433 case LAYOUT_DIRECTION_RTL: 16434 mUserPaddingLeftInitial = end; 16435 mUserPaddingRightInitial = start; 16436 internalSetPadding(end, top, start, bottom); 16437 break; 16438 case LAYOUT_DIRECTION_LTR: 16439 default: 16440 mUserPaddingLeftInitial = start; 16441 mUserPaddingRightInitial = end; 16442 internalSetPadding(start, top, end, bottom); 16443 } 16444 } 16445 16446 /** 16447 * Returns the top padding of this view. 16448 * 16449 * @return the top padding in pixels 16450 */ 16451 public int getPaddingTop() { 16452 return mPaddingTop; 16453 } 16454 16455 /** 16456 * Returns the bottom padding of this view. If there are inset and enabled 16457 * scrollbars, this value may include the space required to display the 16458 * scrollbars as well. 16459 * 16460 * @return the bottom padding in pixels 16461 */ 16462 public int getPaddingBottom() { 16463 return mPaddingBottom; 16464 } 16465 16466 /** 16467 * Returns the left padding of this view. If there are inset and enabled 16468 * scrollbars, this value may include the space required to display the 16469 * scrollbars as well. 16470 * 16471 * @return the left padding in pixels 16472 */ 16473 public int getPaddingLeft() { 16474 if (!isPaddingResolved()) { 16475 resolvePadding(); 16476 } 16477 return mPaddingLeft; 16478 } 16479 16480 /** 16481 * Returns the start padding of this view depending on its resolved layout direction. 16482 * If there are inset and enabled scrollbars, this value may include the space 16483 * required to display the scrollbars as well. 16484 * 16485 * @return the start padding in pixels 16486 */ 16487 public int getPaddingStart() { 16488 if (!isPaddingResolved()) { 16489 resolvePadding(); 16490 } 16491 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 16492 mPaddingRight : mPaddingLeft; 16493 } 16494 16495 /** 16496 * Returns the right padding of this view. If there are inset and enabled 16497 * scrollbars, this value may include the space required to display the 16498 * scrollbars as well. 16499 * 16500 * @return the right padding in pixels 16501 */ 16502 public int getPaddingRight() { 16503 if (!isPaddingResolved()) { 16504 resolvePadding(); 16505 } 16506 return mPaddingRight; 16507 } 16508 16509 /** 16510 * Returns the end padding of this view depending on its resolved layout direction. 16511 * If there are inset and enabled scrollbars, this value may include the space 16512 * required to display the scrollbars as well. 16513 * 16514 * @return the end padding in pixels 16515 */ 16516 public int getPaddingEnd() { 16517 if (!isPaddingResolved()) { 16518 resolvePadding(); 16519 } 16520 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 16521 mPaddingLeft : mPaddingRight; 16522 } 16523 16524 /** 16525 * Return if the padding as been set thru relative values 16526 * {@link #setPaddingRelative(int, int, int, int)} or thru 16527 * @attr ref android.R.styleable#View_paddingStart or 16528 * @attr ref android.R.styleable#View_paddingEnd 16529 * 16530 * @return true if the padding is relative or false if it is not. 16531 */ 16532 public boolean isPaddingRelative() { 16533 return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING); 16534 } 16535 16536 Insets computeOpticalInsets() { 16537 return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets(); 16538 } 16539 16540 /** 16541 * @hide 16542 */ 16543 public void resetPaddingToInitialValues() { 16544 if (isRtlCompatibilityMode()) { 16545 mPaddingLeft = mUserPaddingLeftInitial; 16546 mPaddingRight = mUserPaddingRightInitial; 16547 return; 16548 } 16549 if (isLayoutRtl()) { 16550 mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial; 16551 mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial; 16552 } else { 16553 mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial; 16554 mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial; 16555 } 16556 } 16557 16558 /** 16559 * @hide 16560 */ 16561 public Insets getOpticalInsets() { 16562 if (mLayoutInsets == null) { 16563 mLayoutInsets = computeOpticalInsets(); 16564 } 16565 return mLayoutInsets; 16566 } 16567 16568 /** 16569 * Set this view's optical insets. 16570 * 16571 * <p>This method should be treated similarly to setMeasuredDimension and not as a general 16572 * property. Views that compute their own optical insets should call it as part of measurement. 16573 * This method does not request layout. If you are setting optical insets outside of 16574 * measure/layout itself you will want to call requestLayout() yourself. 16575 * </p> 16576 * @hide 16577 */ 16578 public void setOpticalInsets(Insets insets) { 16579 mLayoutInsets = insets; 16580 } 16581 16582 /** 16583 * Changes the selection state of this view. A view can be selected or not. 16584 * Note that selection is not the same as focus. Views are typically 16585 * selected in the context of an AdapterView like ListView or GridView; 16586 * the selected view is the view that is highlighted. 16587 * 16588 * @param selected true if the view must be selected, false otherwise 16589 */ 16590 public void setSelected(boolean selected) { 16591 //noinspection DoubleNegation 16592 if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) { 16593 mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0); 16594 if (!selected) resetPressedState(); 16595 invalidate(true); 16596 refreshDrawableState(); 16597 dispatchSetSelected(selected); 16598 if (selected) { 16599 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED); 16600 } else { 16601 notifyViewAccessibilityStateChangedIfNeeded( 16602 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 16603 } 16604 } 16605 } 16606 16607 /** 16608 * Dispatch setSelected to all of this View's children. 16609 * 16610 * @see #setSelected(boolean) 16611 * 16612 * @param selected The new selected state 16613 */ 16614 protected void dispatchSetSelected(boolean selected) { 16615 } 16616 16617 /** 16618 * Indicates the selection state of this view. 16619 * 16620 * @return true if the view is selected, false otherwise 16621 */ 16622 @ViewDebug.ExportedProperty 16623 public boolean isSelected() { 16624 return (mPrivateFlags & PFLAG_SELECTED) != 0; 16625 } 16626 16627 /** 16628 * Changes the activated state of this view. A view can be activated or not. 16629 * Note that activation is not the same as selection. Selection is 16630 * a transient property, representing the view (hierarchy) the user is 16631 * currently interacting with. Activation is a longer-term state that the 16632 * user can move views in and out of. For example, in a list view with 16633 * single or multiple selection enabled, the views in the current selection 16634 * set are activated. (Um, yeah, we are deeply sorry about the terminology 16635 * here.) The activated state is propagated down to children of the view it 16636 * is set on. 16637 * 16638 * @param activated true if the view must be activated, false otherwise 16639 */ 16640 public void setActivated(boolean activated) { 16641 //noinspection DoubleNegation 16642 if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) { 16643 mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0); 16644 invalidate(true); 16645 refreshDrawableState(); 16646 dispatchSetActivated(activated); 16647 } 16648 } 16649 16650 /** 16651 * Dispatch setActivated to all of this View's children. 16652 * 16653 * @see #setActivated(boolean) 16654 * 16655 * @param activated The new activated state 16656 */ 16657 protected void dispatchSetActivated(boolean activated) { 16658 } 16659 16660 /** 16661 * Indicates the activation state of this view. 16662 * 16663 * @return true if the view is activated, false otherwise 16664 */ 16665 @ViewDebug.ExportedProperty 16666 public boolean isActivated() { 16667 return (mPrivateFlags & PFLAG_ACTIVATED) != 0; 16668 } 16669 16670 /** 16671 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 16672 * observer can be used to get notifications when global events, like 16673 * layout, happen. 16674 * 16675 * The returned ViewTreeObserver observer is not guaranteed to remain 16676 * valid for the lifetime of this View. If the caller of this method keeps 16677 * a long-lived reference to ViewTreeObserver, it should always check for 16678 * the return value of {@link ViewTreeObserver#isAlive()}. 16679 * 16680 * @return The ViewTreeObserver for this view's hierarchy. 16681 */ 16682 public ViewTreeObserver getViewTreeObserver() { 16683 if (mAttachInfo != null) { 16684 return mAttachInfo.mTreeObserver; 16685 } 16686 if (mFloatingTreeObserver == null) { 16687 mFloatingTreeObserver = new ViewTreeObserver(); 16688 } 16689 return mFloatingTreeObserver; 16690 } 16691 16692 /** 16693 * <p>Finds the topmost view in the current view hierarchy.</p> 16694 * 16695 * @return the topmost view containing this view 16696 */ 16697 public View getRootView() { 16698 if (mAttachInfo != null) { 16699 final View v = mAttachInfo.mRootView; 16700 if (v != null) { 16701 return v; 16702 } 16703 } 16704 16705 View parent = this; 16706 16707 while (parent.mParent != null && parent.mParent instanceof View) { 16708 parent = (View) parent.mParent; 16709 } 16710 16711 return parent; 16712 } 16713 16714 /** 16715 * Transforms a motion event from view-local coordinates to on-screen 16716 * coordinates. 16717 * 16718 * @param ev the view-local motion event 16719 * @return false if the transformation could not be applied 16720 * @hide 16721 */ 16722 public boolean toGlobalMotionEvent(MotionEvent ev) { 16723 final AttachInfo info = mAttachInfo; 16724 if (info == null) { 16725 return false; 16726 } 16727 16728 final Matrix m = info.mTmpMatrix; 16729 m.set(Matrix.IDENTITY_MATRIX); 16730 transformMatrixToGlobal(m); 16731 ev.transform(m); 16732 return true; 16733 } 16734 16735 /** 16736 * Transforms a motion event from on-screen coordinates to view-local 16737 * coordinates. 16738 * 16739 * @param ev the on-screen motion event 16740 * @return false if the transformation could not be applied 16741 * @hide 16742 */ 16743 public boolean toLocalMotionEvent(MotionEvent ev) { 16744 final AttachInfo info = mAttachInfo; 16745 if (info == null) { 16746 return false; 16747 } 16748 16749 final Matrix m = info.mTmpMatrix; 16750 m.set(Matrix.IDENTITY_MATRIX); 16751 transformMatrixToLocal(m); 16752 ev.transform(m); 16753 return true; 16754 } 16755 16756 /** 16757 * Modifies the input matrix such that it maps view-local coordinates to 16758 * on-screen coordinates. 16759 * 16760 * @param m input matrix to modify 16761 * @hide 16762 */ 16763 public void transformMatrixToGlobal(Matrix m) { 16764 final ViewParent parent = mParent; 16765 if (parent instanceof View) { 16766 final View vp = (View) parent; 16767 vp.transformMatrixToGlobal(m); 16768 m.preTranslate(-vp.mScrollX, -vp.mScrollY); 16769 } else if (parent instanceof ViewRootImpl) { 16770 final ViewRootImpl vr = (ViewRootImpl) parent; 16771 vr.transformMatrixToGlobal(m); 16772 m.preTranslate(0, -vr.mCurScrollY); 16773 } 16774 16775 m.preTranslate(mLeft, mTop); 16776 16777 if (!hasIdentityMatrix()) { 16778 m.preConcat(getMatrix()); 16779 } 16780 } 16781 16782 /** 16783 * Modifies the input matrix such that it maps on-screen coordinates to 16784 * view-local coordinates. 16785 * 16786 * @param m input matrix to modify 16787 * @hide 16788 */ 16789 public void transformMatrixToLocal(Matrix m) { 16790 final ViewParent parent = mParent; 16791 if (parent instanceof View) { 16792 final View vp = (View) parent; 16793 vp.transformMatrixToLocal(m); 16794 m.postTranslate(vp.mScrollX, vp.mScrollY); 16795 } else if (parent instanceof ViewRootImpl) { 16796 final ViewRootImpl vr = (ViewRootImpl) parent; 16797 vr.transformMatrixToLocal(m); 16798 m.postTranslate(0, vr.mCurScrollY); 16799 } 16800 16801 m.postTranslate(-mLeft, -mTop); 16802 16803 if (!hasIdentityMatrix()) { 16804 m.postConcat(getInverseMatrix()); 16805 } 16806 } 16807 16808 /** 16809 * @hide 16810 */ 16811 @ViewDebug.ExportedProperty(category = "layout", indexMapping = { 16812 @ViewDebug.IntToString(from = 0, to = "x"), 16813 @ViewDebug.IntToString(from = 1, to = "y") 16814 }) 16815 public int[] getLocationOnScreen() { 16816 int[] location = new int[2]; 16817 getLocationOnScreen(location); 16818 return location; 16819 } 16820 16821 /** 16822 * <p>Computes the coordinates of this view on the screen. The argument 16823 * must be an array of two integers. After the method returns, the array 16824 * contains the x and y location in that order.</p> 16825 * 16826 * @param location an array of two integers in which to hold the coordinates 16827 */ 16828 public void getLocationOnScreen(int[] location) { 16829 getLocationInWindow(location); 16830 16831 final AttachInfo info = mAttachInfo; 16832 if (info != null) { 16833 location[0] += info.mWindowLeft; 16834 location[1] += info.mWindowTop; 16835 } 16836 } 16837 16838 /** 16839 * <p>Computes the coordinates of this view in its window. The argument 16840 * must be an array of two integers. After the method returns, the array 16841 * contains the x and y location in that order.</p> 16842 * 16843 * @param location an array of two integers in which to hold the coordinates 16844 */ 16845 public void getLocationInWindow(int[] location) { 16846 if (location == null || location.length < 2) { 16847 throw new IllegalArgumentException("location must be an array of two integers"); 16848 } 16849 16850 if (mAttachInfo == null) { 16851 // When the view is not attached to a window, this method does not make sense 16852 location[0] = location[1] = 0; 16853 return; 16854 } 16855 16856 float[] position = mAttachInfo.mTmpTransformLocation; 16857 position[0] = position[1] = 0.0f; 16858 16859 if (!hasIdentityMatrix()) { 16860 getMatrix().mapPoints(position); 16861 } 16862 16863 position[0] += mLeft; 16864 position[1] += mTop; 16865 16866 ViewParent viewParent = mParent; 16867 while (viewParent instanceof View) { 16868 final View view = (View) viewParent; 16869 16870 position[0] -= view.mScrollX; 16871 position[1] -= view.mScrollY; 16872 16873 if (!view.hasIdentityMatrix()) { 16874 view.getMatrix().mapPoints(position); 16875 } 16876 16877 position[0] += view.mLeft; 16878 position[1] += view.mTop; 16879 16880 viewParent = view.mParent; 16881 } 16882 16883 if (viewParent instanceof ViewRootImpl) { 16884 // *cough* 16885 final ViewRootImpl vr = (ViewRootImpl) viewParent; 16886 position[1] -= vr.mCurScrollY; 16887 } 16888 16889 location[0] = (int) (position[0] + 0.5f); 16890 location[1] = (int) (position[1] + 0.5f); 16891 } 16892 16893 /** 16894 * {@hide} 16895 * @param id the id of the view to be found 16896 * @return the view of the specified id, null if cannot be found 16897 */ 16898 protected View findViewTraversal(int id) { 16899 if (id == mID) { 16900 return this; 16901 } 16902 return null; 16903 } 16904 16905 /** 16906 * {@hide} 16907 * @param tag the tag of the view to be found 16908 * @return the view of specified tag, null if cannot be found 16909 */ 16910 protected View findViewWithTagTraversal(Object tag) { 16911 if (tag != null && tag.equals(mTag)) { 16912 return this; 16913 } 16914 return null; 16915 } 16916 16917 /** 16918 * {@hide} 16919 * @param predicate The predicate to evaluate. 16920 * @param childToSkip If not null, ignores this child during the recursive traversal. 16921 * @return The first view that matches the predicate or null. 16922 */ 16923 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 16924 if (predicate.apply(this)) { 16925 return this; 16926 } 16927 return null; 16928 } 16929 16930 /** 16931 * Look for a child view with the given id. If this view has the given 16932 * id, return this view. 16933 * 16934 * @param id The id to search for. 16935 * @return The view that has the given id in the hierarchy or null 16936 */ 16937 public final View findViewById(int id) { 16938 if (id < 0) { 16939 return null; 16940 } 16941 return findViewTraversal(id); 16942 } 16943 16944 /** 16945 * Finds a view by its unuque and stable accessibility id. 16946 * 16947 * @param accessibilityId The searched accessibility id. 16948 * @return The found view. 16949 */ 16950 final View findViewByAccessibilityId(int accessibilityId) { 16951 if (accessibilityId < 0) { 16952 return null; 16953 } 16954 return findViewByAccessibilityIdTraversal(accessibilityId); 16955 } 16956 16957 /** 16958 * Performs the traversal to find a view by its unuque and stable accessibility id. 16959 * 16960 * <strong>Note:</strong>This method does not stop at the root namespace 16961 * boundary since the user can touch the screen at an arbitrary location 16962 * potentially crossing the root namespace bounday which will send an 16963 * accessibility event to accessibility services and they should be able 16964 * to obtain the event source. Also accessibility ids are guaranteed to be 16965 * unique in the window. 16966 * 16967 * @param accessibilityId The accessibility id. 16968 * @return The found view. 16969 * 16970 * @hide 16971 */ 16972 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 16973 if (getAccessibilityViewId() == accessibilityId) { 16974 return this; 16975 } 16976 return null; 16977 } 16978 16979 /** 16980 * Look for a child view with the given tag. If this view has the given 16981 * tag, return this view. 16982 * 16983 * @param tag The tag to search for, using "tag.equals(getTag())". 16984 * @return The View that has the given tag in the hierarchy or null 16985 */ 16986 public final View findViewWithTag(Object tag) { 16987 if (tag == null) { 16988 return null; 16989 } 16990 return findViewWithTagTraversal(tag); 16991 } 16992 16993 /** 16994 * {@hide} 16995 * Look for a child view that matches the specified predicate. 16996 * If this view matches the predicate, return this view. 16997 * 16998 * @param predicate The predicate to evaluate. 16999 * @return The first view that matches the predicate or null. 17000 */ 17001 public final View findViewByPredicate(Predicate<View> predicate) { 17002 return findViewByPredicateTraversal(predicate, null); 17003 } 17004 17005 /** 17006 * {@hide} 17007 * Look for a child view that matches the specified predicate, 17008 * starting with the specified view and its descendents and then 17009 * recusively searching the ancestors and siblings of that view 17010 * until this view is reached. 17011 * 17012 * This method is useful in cases where the predicate does not match 17013 * a single unique view (perhaps multiple views use the same id) 17014 * and we are trying to find the view that is "closest" in scope to the 17015 * starting view. 17016 * 17017 * @param start The view to start from. 17018 * @param predicate The predicate to evaluate. 17019 * @return The first view that matches the predicate or null. 17020 */ 17021 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 17022 View childToSkip = null; 17023 for (;;) { 17024 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 17025 if (view != null || start == this) { 17026 return view; 17027 } 17028 17029 ViewParent parent = start.getParent(); 17030 if (parent == null || !(parent instanceof View)) { 17031 return null; 17032 } 17033 17034 childToSkip = start; 17035 start = (View) parent; 17036 } 17037 } 17038 17039 /** 17040 * Sets the identifier for this view. The identifier does not have to be 17041 * unique in this view's hierarchy. The identifier should be a positive 17042 * number. 17043 * 17044 * @see #NO_ID 17045 * @see #getId() 17046 * @see #findViewById(int) 17047 * 17048 * @param id a number used to identify the view 17049 * 17050 * @attr ref android.R.styleable#View_id 17051 */ 17052 public void setId(int id) { 17053 mID = id; 17054 if (mID == View.NO_ID && mLabelForId != View.NO_ID) { 17055 mID = generateViewId(); 17056 } 17057 } 17058 17059 /** 17060 * {@hide} 17061 * 17062 * @param isRoot true if the view belongs to the root namespace, false 17063 * otherwise 17064 */ 17065 public void setIsRootNamespace(boolean isRoot) { 17066 if (isRoot) { 17067 mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE; 17068 } else { 17069 mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE; 17070 } 17071 } 17072 17073 /** 17074 * {@hide} 17075 * 17076 * @return true if the view belongs to the root namespace, false otherwise 17077 */ 17078 public boolean isRootNamespace() { 17079 return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0; 17080 } 17081 17082 /** 17083 * Returns this view's identifier. 17084 * 17085 * @return a positive integer used to identify the view or {@link #NO_ID} 17086 * if the view has no ID 17087 * 17088 * @see #setId(int) 17089 * @see #findViewById(int) 17090 * @attr ref android.R.styleable#View_id 17091 */ 17092 @ViewDebug.CapturedViewProperty 17093 public int getId() { 17094 return mID; 17095 } 17096 17097 /** 17098 * Returns this view's tag. 17099 * 17100 * @return the Object stored in this view as a tag, or {@code null} if not 17101 * set 17102 * 17103 * @see #setTag(Object) 17104 * @see #getTag(int) 17105 */ 17106 @ViewDebug.ExportedProperty 17107 public Object getTag() { 17108 return mTag; 17109 } 17110 17111 /** 17112 * Sets the tag associated with this view. A tag can be used to mark 17113 * a view in its hierarchy and does not have to be unique within the 17114 * hierarchy. Tags can also be used to store data within a view without 17115 * resorting to another data structure. 17116 * 17117 * @param tag an Object to tag the view with 17118 * 17119 * @see #getTag() 17120 * @see #setTag(int, Object) 17121 */ 17122 public void setTag(final Object tag) { 17123 mTag = tag; 17124 } 17125 17126 /** 17127 * Returns the tag associated with this view and the specified key. 17128 * 17129 * @param key The key identifying the tag 17130 * 17131 * @return the Object stored in this view as a tag, or {@code null} if not 17132 * set 17133 * 17134 * @see #setTag(int, Object) 17135 * @see #getTag() 17136 */ 17137 public Object getTag(int key) { 17138 if (mKeyedTags != null) return mKeyedTags.get(key); 17139 return null; 17140 } 17141 17142 /** 17143 * Sets a tag associated with this view and a key. A tag can be used 17144 * to mark a view in its hierarchy and does not have to be unique within 17145 * the hierarchy. Tags can also be used to store data within a view 17146 * without resorting to another data structure. 17147 * 17148 * The specified key should be an id declared in the resources of the 17149 * application to ensure it is unique (see the <a 17150 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 17151 * Keys identified as belonging to 17152 * the Android framework or not associated with any package will cause 17153 * an {@link IllegalArgumentException} to be thrown. 17154 * 17155 * @param key The key identifying the tag 17156 * @param tag An Object to tag the view with 17157 * 17158 * @throws IllegalArgumentException If they specified key is not valid 17159 * 17160 * @see #setTag(Object) 17161 * @see #getTag(int) 17162 */ 17163 public void setTag(int key, final Object tag) { 17164 // If the package id is 0x00 or 0x01, it's either an undefined package 17165 // or a framework id 17166 if ((key >>> 24) < 2) { 17167 throw new IllegalArgumentException("The key must be an application-specific " 17168 + "resource id."); 17169 } 17170 17171 setKeyedTag(key, tag); 17172 } 17173 17174 /** 17175 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 17176 * framework id. 17177 * 17178 * @hide 17179 */ 17180 public void setTagInternal(int key, Object tag) { 17181 if ((key >>> 24) != 0x1) { 17182 throw new IllegalArgumentException("The key must be a framework-specific " 17183 + "resource id."); 17184 } 17185 17186 setKeyedTag(key, tag); 17187 } 17188 17189 private void setKeyedTag(int key, Object tag) { 17190 if (mKeyedTags == null) { 17191 mKeyedTags = new SparseArray<Object>(2); 17192 } 17193 17194 mKeyedTags.put(key, tag); 17195 } 17196 17197 /** 17198 * Prints information about this view in the log output, with the tag 17199 * {@link #VIEW_LOG_TAG}. 17200 * 17201 * @hide 17202 */ 17203 public void debug() { 17204 debug(0); 17205 } 17206 17207 /** 17208 * Prints information about this view in the log output, with the tag 17209 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 17210 * indentation defined by the <code>depth</code>. 17211 * 17212 * @param depth the indentation level 17213 * 17214 * @hide 17215 */ 17216 protected void debug(int depth) { 17217 String output = debugIndent(depth - 1); 17218 17219 output += "+ " + this; 17220 int id = getId(); 17221 if (id != -1) { 17222 output += " (id=" + id + ")"; 17223 } 17224 Object tag = getTag(); 17225 if (tag != null) { 17226 output += " (tag=" + tag + ")"; 17227 } 17228 Log.d(VIEW_LOG_TAG, output); 17229 17230 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 17231 output = debugIndent(depth) + " FOCUSED"; 17232 Log.d(VIEW_LOG_TAG, output); 17233 } 17234 17235 output = debugIndent(depth); 17236 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 17237 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 17238 + "} "; 17239 Log.d(VIEW_LOG_TAG, output); 17240 17241 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 17242 || mPaddingBottom != 0) { 17243 output = debugIndent(depth); 17244 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 17245 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 17246 Log.d(VIEW_LOG_TAG, output); 17247 } 17248 17249 output = debugIndent(depth); 17250 output += "mMeasureWidth=" + mMeasuredWidth + 17251 " mMeasureHeight=" + mMeasuredHeight; 17252 Log.d(VIEW_LOG_TAG, output); 17253 17254 output = debugIndent(depth); 17255 if (mLayoutParams == null) { 17256 output += "BAD! no layout params"; 17257 } else { 17258 output = mLayoutParams.debug(output); 17259 } 17260 Log.d(VIEW_LOG_TAG, output); 17261 17262 output = debugIndent(depth); 17263 output += "flags={"; 17264 output += View.printFlags(mViewFlags); 17265 output += "}"; 17266 Log.d(VIEW_LOG_TAG, output); 17267 17268 output = debugIndent(depth); 17269 output += "privateFlags={"; 17270 output += View.printPrivateFlags(mPrivateFlags); 17271 output += "}"; 17272 Log.d(VIEW_LOG_TAG, output); 17273 } 17274 17275 /** 17276 * Creates a string of whitespaces used for indentation. 17277 * 17278 * @param depth the indentation level 17279 * @return a String containing (depth * 2 + 3) * 2 white spaces 17280 * 17281 * @hide 17282 */ 17283 protected static String debugIndent(int depth) { 17284 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 17285 for (int i = 0; i < (depth * 2) + 3; i++) { 17286 spaces.append(' ').append(' '); 17287 } 17288 return spaces.toString(); 17289 } 17290 17291 /** 17292 * <p>Return the offset of the widget's text baseline from the widget's top 17293 * boundary. If this widget does not support baseline alignment, this 17294 * method returns -1. </p> 17295 * 17296 * @return the offset of the baseline within the widget's bounds or -1 17297 * if baseline alignment is not supported 17298 */ 17299 @ViewDebug.ExportedProperty(category = "layout") 17300 public int getBaseline() { 17301 return -1; 17302 } 17303 17304 /** 17305 * Returns whether the view hierarchy is currently undergoing a layout pass. This 17306 * information is useful to avoid situations such as calling {@link #requestLayout()} during 17307 * a layout pass. 17308 * 17309 * @return whether the view hierarchy is currently undergoing a layout pass 17310 */ 17311 public boolean isInLayout() { 17312 ViewRootImpl viewRoot = getViewRootImpl(); 17313 return (viewRoot != null && viewRoot.isInLayout()); 17314 } 17315 17316 /** 17317 * Call this when something has changed which has invalidated the 17318 * layout of this view. This will schedule a layout pass of the view 17319 * tree. This should not be called while the view hierarchy is currently in a layout 17320 * pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the 17321 * end of the current layout pass (and then layout will run again) or after the current 17322 * frame is drawn and the next layout occurs. 17323 * 17324 * <p>Subclasses which override this method should call the superclass method to 17325 * handle possible request-during-layout errors correctly.</p> 17326 */ 17327 public void requestLayout() { 17328 if (mMeasureCache != null) mMeasureCache.clear(); 17329 17330 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) { 17331 // Only trigger request-during-layout logic if this is the view requesting it, 17332 // not the views in its parent hierarchy 17333 ViewRootImpl viewRoot = getViewRootImpl(); 17334 if (viewRoot != null && viewRoot.isInLayout()) { 17335 if (!viewRoot.requestLayoutDuringLayout(this)) { 17336 return; 17337 } 17338 } 17339 mAttachInfo.mViewRequestingLayout = this; 17340 } 17341 17342 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 17343 mPrivateFlags |= PFLAG_INVALIDATED; 17344 17345 if (mParent != null && !mParent.isLayoutRequested()) { 17346 mParent.requestLayout(); 17347 } 17348 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == this) { 17349 mAttachInfo.mViewRequestingLayout = null; 17350 } 17351 } 17352 17353 /** 17354 * Forces this view to be laid out during the next layout pass. 17355 * This method does not call requestLayout() or forceLayout() 17356 * on the parent. 17357 */ 17358 public void forceLayout() { 17359 if (mMeasureCache != null) mMeasureCache.clear(); 17360 17361 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 17362 mPrivateFlags |= PFLAG_INVALIDATED; 17363 } 17364 17365 /** 17366 * <p> 17367 * This is called to find out how big a view should be. The parent 17368 * supplies constraint information in the width and height parameters. 17369 * </p> 17370 * 17371 * <p> 17372 * The actual measurement work of a view is performed in 17373 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 17374 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 17375 * </p> 17376 * 17377 * 17378 * @param widthMeasureSpec Horizontal space requirements as imposed by the 17379 * parent 17380 * @param heightMeasureSpec Vertical space requirements as imposed by the 17381 * parent 17382 * 17383 * @see #onMeasure(int, int) 17384 */ 17385 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 17386 boolean optical = isLayoutModeOptical(this); 17387 if (optical != isLayoutModeOptical(mParent)) { 17388 Insets insets = getOpticalInsets(); 17389 int oWidth = insets.left + insets.right; 17390 int oHeight = insets.top + insets.bottom; 17391 widthMeasureSpec = MeasureSpec.adjust(widthMeasureSpec, optical ? -oWidth : oWidth); 17392 heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight); 17393 } 17394 17395 // Suppress sign extension for the low bytes 17396 long key = (long) widthMeasureSpec << 32 | (long) heightMeasureSpec & 0xffffffffL; 17397 if (mMeasureCache == null) mMeasureCache = new LongSparseLongArray(2); 17398 17399 final boolean forceLayout = (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT; 17400 final boolean isExactly = MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY && 17401 MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.EXACTLY; 17402 final boolean matchingSize = isExactly && 17403 getMeasuredWidth() == MeasureSpec.getSize(widthMeasureSpec) && 17404 getMeasuredHeight() == MeasureSpec.getSize(heightMeasureSpec); 17405 if (forceLayout || !matchingSize && 17406 (widthMeasureSpec != mOldWidthMeasureSpec || 17407 heightMeasureSpec != mOldHeightMeasureSpec)) { 17408 17409 // first clears the measured dimension flag 17410 mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET; 17411 17412 resolveRtlPropertiesIfNeeded(); 17413 17414 int cacheIndex = forceLayout ? -1 : mMeasureCache.indexOfKey(key); 17415 if (cacheIndex < 0 || sIgnoreMeasureCache) { 17416 // measure ourselves, this should set the measured dimension flag back 17417 onMeasure(widthMeasureSpec, heightMeasureSpec); 17418 mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 17419 } else { 17420 long value = mMeasureCache.valueAt(cacheIndex); 17421 // Casting a long to int drops the high 32 bits, no mask needed 17422 setMeasuredDimensionRaw((int) (value >> 32), (int) value); 17423 mPrivateFlags3 |= PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 17424 } 17425 17426 // flag not set, setMeasuredDimension() was not invoked, we raise 17427 // an exception to warn the developer 17428 if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) { 17429 throw new IllegalStateException("onMeasure() did not set the" 17430 + " measured dimension by calling" 17431 + " setMeasuredDimension()"); 17432 } 17433 17434 mPrivateFlags |= PFLAG_LAYOUT_REQUIRED; 17435 } 17436 17437 mOldWidthMeasureSpec = widthMeasureSpec; 17438 mOldHeightMeasureSpec = heightMeasureSpec; 17439 17440 mMeasureCache.put(key, ((long) mMeasuredWidth) << 32 | 17441 (long) mMeasuredHeight & 0xffffffffL); // suppress sign extension 17442 } 17443 17444 /** 17445 * <p> 17446 * Measure the view and its content to determine the measured width and the 17447 * measured height. This method is invoked by {@link #measure(int, int)} and 17448 * should be overriden by subclasses to provide accurate and efficient 17449 * measurement of their contents. 17450 * </p> 17451 * 17452 * <p> 17453 * <strong>CONTRACT:</strong> When overriding this method, you 17454 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 17455 * measured width and height of this view. Failure to do so will trigger an 17456 * <code>IllegalStateException</code>, thrown by 17457 * {@link #measure(int, int)}. Calling the superclass' 17458 * {@link #onMeasure(int, int)} is a valid use. 17459 * </p> 17460 * 17461 * <p> 17462 * The base class implementation of measure defaults to the background size, 17463 * unless a larger size is allowed by the MeasureSpec. Subclasses should 17464 * override {@link #onMeasure(int, int)} to provide better measurements of 17465 * their content. 17466 * </p> 17467 * 17468 * <p> 17469 * If this method is overridden, it is the subclass's responsibility to make 17470 * sure the measured height and width are at least the view's minimum height 17471 * and width ({@link #getSuggestedMinimumHeight()} and 17472 * {@link #getSuggestedMinimumWidth()}). 17473 * </p> 17474 * 17475 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 17476 * The requirements are encoded with 17477 * {@link android.view.View.MeasureSpec}. 17478 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 17479 * The requirements are encoded with 17480 * {@link android.view.View.MeasureSpec}. 17481 * 17482 * @see #getMeasuredWidth() 17483 * @see #getMeasuredHeight() 17484 * @see #setMeasuredDimension(int, int) 17485 * @see #getSuggestedMinimumHeight() 17486 * @see #getSuggestedMinimumWidth() 17487 * @see android.view.View.MeasureSpec#getMode(int) 17488 * @see android.view.View.MeasureSpec#getSize(int) 17489 */ 17490 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 17491 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 17492 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 17493 } 17494 17495 /** 17496 * <p>This method must be called by {@link #onMeasure(int, int)} to store the 17497 * measured width and measured height. Failing to do so will trigger an 17498 * exception at measurement time.</p> 17499 * 17500 * @param measuredWidth The measured width of this view. May be a complex 17501 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 17502 * {@link #MEASURED_STATE_TOO_SMALL}. 17503 * @param measuredHeight The measured height of this view. May be a complex 17504 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 17505 * {@link #MEASURED_STATE_TOO_SMALL}. 17506 */ 17507 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 17508 boolean optical = isLayoutModeOptical(this); 17509 if (optical != isLayoutModeOptical(mParent)) { 17510 Insets insets = getOpticalInsets(); 17511 int opticalWidth = insets.left + insets.right; 17512 int opticalHeight = insets.top + insets.bottom; 17513 17514 measuredWidth += optical ? opticalWidth : -opticalWidth; 17515 measuredHeight += optical ? opticalHeight : -opticalHeight; 17516 } 17517 setMeasuredDimensionRaw(measuredWidth, measuredHeight); 17518 } 17519 17520 /** 17521 * Sets the measured dimension without extra processing for things like optical bounds. 17522 * Useful for reapplying consistent values that have already been cooked with adjustments 17523 * for optical bounds, etc. such as those from the measurement cache. 17524 * 17525 * @param measuredWidth The measured width of this view. May be a complex 17526 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 17527 * {@link #MEASURED_STATE_TOO_SMALL}. 17528 * @param measuredHeight The measured height of this view. May be a complex 17529 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 17530 * {@link #MEASURED_STATE_TOO_SMALL}. 17531 */ 17532 private void setMeasuredDimensionRaw(int measuredWidth, int measuredHeight) { 17533 mMeasuredWidth = measuredWidth; 17534 mMeasuredHeight = measuredHeight; 17535 17536 mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET; 17537 } 17538 17539 /** 17540 * Merge two states as returned by {@link #getMeasuredState()}. 17541 * @param curState The current state as returned from a view or the result 17542 * of combining multiple views. 17543 * @param newState The new view state to combine. 17544 * @return Returns a new integer reflecting the combination of the two 17545 * states. 17546 */ 17547 public static int combineMeasuredStates(int curState, int newState) { 17548 return curState | newState; 17549 } 17550 17551 /** 17552 * Version of {@link #resolveSizeAndState(int, int, int)} 17553 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 17554 */ 17555 public static int resolveSize(int size, int measureSpec) { 17556 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 17557 } 17558 17559 /** 17560 * Utility to reconcile a desired size and state, with constraints imposed 17561 * by a MeasureSpec. Will take the desired size, unless a different size 17562 * is imposed by the constraints. The returned value is a compound integer, 17563 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 17564 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 17565 * size is smaller than the size the view wants to be. 17566 * 17567 * @param size How big the view wants to be 17568 * @param measureSpec Constraints imposed by the parent 17569 * @return Size information bit mask as defined by 17570 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 17571 */ 17572 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 17573 int result = size; 17574 int specMode = MeasureSpec.getMode(measureSpec); 17575 int specSize = MeasureSpec.getSize(measureSpec); 17576 switch (specMode) { 17577 case MeasureSpec.UNSPECIFIED: 17578 result = size; 17579 break; 17580 case MeasureSpec.AT_MOST: 17581 if (specSize < size) { 17582 result = specSize | MEASURED_STATE_TOO_SMALL; 17583 } else { 17584 result = size; 17585 } 17586 break; 17587 case MeasureSpec.EXACTLY: 17588 result = specSize; 17589 break; 17590 } 17591 return result | (childMeasuredState&MEASURED_STATE_MASK); 17592 } 17593 17594 /** 17595 * Utility to return a default size. Uses the supplied size if the 17596 * MeasureSpec imposed no constraints. Will get larger if allowed 17597 * by the MeasureSpec. 17598 * 17599 * @param size Default size for this view 17600 * @param measureSpec Constraints imposed by the parent 17601 * @return The size this view should be. 17602 */ 17603 public static int getDefaultSize(int size, int measureSpec) { 17604 int result = size; 17605 int specMode = MeasureSpec.getMode(measureSpec); 17606 int specSize = MeasureSpec.getSize(measureSpec); 17607 17608 switch (specMode) { 17609 case MeasureSpec.UNSPECIFIED: 17610 result = size; 17611 break; 17612 case MeasureSpec.AT_MOST: 17613 case MeasureSpec.EXACTLY: 17614 result = specSize; 17615 break; 17616 } 17617 return result; 17618 } 17619 17620 /** 17621 * Returns the suggested minimum height that the view should use. This 17622 * returns the maximum of the view's minimum height 17623 * and the background's minimum height 17624 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 17625 * <p> 17626 * When being used in {@link #onMeasure(int, int)}, the caller should still 17627 * ensure the returned height is within the requirements of the parent. 17628 * 17629 * @return The suggested minimum height of the view. 17630 */ 17631 protected int getSuggestedMinimumHeight() { 17632 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 17633 17634 } 17635 17636 /** 17637 * Returns the suggested minimum width that the view should use. This 17638 * returns the maximum of the view's minimum width) 17639 * and the background's minimum width 17640 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 17641 * <p> 17642 * When being used in {@link #onMeasure(int, int)}, the caller should still 17643 * ensure the returned width is within the requirements of the parent. 17644 * 17645 * @return The suggested minimum width of the view. 17646 */ 17647 protected int getSuggestedMinimumWidth() { 17648 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 17649 } 17650 17651 /** 17652 * Returns the minimum height of the view. 17653 * 17654 * @return the minimum height the view will try to be. 17655 * 17656 * @see #setMinimumHeight(int) 17657 * 17658 * @attr ref android.R.styleable#View_minHeight 17659 */ 17660 public int getMinimumHeight() { 17661 return mMinHeight; 17662 } 17663 17664 /** 17665 * Sets the minimum height of the view. It is not guaranteed the view will 17666 * be able to achieve this minimum height (for example, if its parent layout 17667 * constrains it with less available height). 17668 * 17669 * @param minHeight The minimum height the view will try to be. 17670 * 17671 * @see #getMinimumHeight() 17672 * 17673 * @attr ref android.R.styleable#View_minHeight 17674 */ 17675 public void setMinimumHeight(int minHeight) { 17676 mMinHeight = minHeight; 17677 requestLayout(); 17678 } 17679 17680 /** 17681 * Returns the minimum width of the view. 17682 * 17683 * @return the minimum width the view will try to be. 17684 * 17685 * @see #setMinimumWidth(int) 17686 * 17687 * @attr ref android.R.styleable#View_minWidth 17688 */ 17689 public int getMinimumWidth() { 17690 return mMinWidth; 17691 } 17692 17693 /** 17694 * Sets the minimum width of the view. It is not guaranteed the view will 17695 * be able to achieve this minimum width (for example, if its parent layout 17696 * constrains it with less available width). 17697 * 17698 * @param minWidth The minimum width the view will try to be. 17699 * 17700 * @see #getMinimumWidth() 17701 * 17702 * @attr ref android.R.styleable#View_minWidth 17703 */ 17704 public void setMinimumWidth(int minWidth) { 17705 mMinWidth = minWidth; 17706 requestLayout(); 17707 17708 } 17709 17710 /** 17711 * Get the animation currently associated with this view. 17712 * 17713 * @return The animation that is currently playing or 17714 * scheduled to play for this view. 17715 */ 17716 public Animation getAnimation() { 17717 return mCurrentAnimation; 17718 } 17719 17720 /** 17721 * Start the specified animation now. 17722 * 17723 * @param animation the animation to start now 17724 */ 17725 public void startAnimation(Animation animation) { 17726 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 17727 setAnimation(animation); 17728 invalidateParentCaches(); 17729 invalidate(true); 17730 } 17731 17732 /** 17733 * Cancels any animations for this view. 17734 */ 17735 public void clearAnimation() { 17736 if (mCurrentAnimation != null) { 17737 mCurrentAnimation.detach(); 17738 } 17739 mCurrentAnimation = null; 17740 invalidateParentIfNeeded(); 17741 } 17742 17743 /** 17744 * Sets the next animation to play for this view. 17745 * If you want the animation to play immediately, use 17746 * {@link #startAnimation(android.view.animation.Animation)} instead. 17747 * This method provides allows fine-grained 17748 * control over the start time and invalidation, but you 17749 * must make sure that 1) the animation has a start time set, and 17750 * 2) the view's parent (which controls animations on its children) 17751 * will be invalidated when the animation is supposed to 17752 * start. 17753 * 17754 * @param animation The next animation, or null. 17755 */ 17756 public void setAnimation(Animation animation) { 17757 mCurrentAnimation = animation; 17758 17759 if (animation != null) { 17760 // If the screen is off assume the animation start time is now instead of 17761 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 17762 // would cause the animation to start when the screen turns back on 17763 if (mAttachInfo != null && mAttachInfo.mDisplayState == Display.STATE_OFF 17764 && animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 17765 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 17766 } 17767 animation.reset(); 17768 } 17769 } 17770 17771 /** 17772 * Invoked by a parent ViewGroup to notify the start of the animation 17773 * currently associated with this view. If you override this method, 17774 * always call super.onAnimationStart(); 17775 * 17776 * @see #setAnimation(android.view.animation.Animation) 17777 * @see #getAnimation() 17778 */ 17779 protected void onAnimationStart() { 17780 mPrivateFlags |= PFLAG_ANIMATION_STARTED; 17781 } 17782 17783 /** 17784 * Invoked by a parent ViewGroup to notify the end of the animation 17785 * currently associated with this view. If you override this method, 17786 * always call super.onAnimationEnd(); 17787 * 17788 * @see #setAnimation(android.view.animation.Animation) 17789 * @see #getAnimation() 17790 */ 17791 protected void onAnimationEnd() { 17792 mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 17793 } 17794 17795 /** 17796 * Invoked if there is a Transform that involves alpha. Subclass that can 17797 * draw themselves with the specified alpha should return true, and then 17798 * respect that alpha when their onDraw() is called. If this returns false 17799 * then the view may be redirected to draw into an offscreen buffer to 17800 * fulfill the request, which will look fine, but may be slower than if the 17801 * subclass handles it internally. The default implementation returns false. 17802 * 17803 * @param alpha The alpha (0..255) to apply to the view's drawing 17804 * @return true if the view can draw with the specified alpha. 17805 */ 17806 protected boolean onSetAlpha(int alpha) { 17807 return false; 17808 } 17809 17810 /** 17811 * This is used by the RootView to perform an optimization when 17812 * the view hierarchy contains one or several SurfaceView. 17813 * SurfaceView is always considered transparent, but its children are not, 17814 * therefore all View objects remove themselves from the global transparent 17815 * region (passed as a parameter to this function). 17816 * 17817 * @param region The transparent region for this ViewAncestor (window). 17818 * 17819 * @return Returns true if the effective visibility of the view at this 17820 * point is opaque, regardless of the transparent region; returns false 17821 * if it is possible for underlying windows to be seen behind the view. 17822 * 17823 * {@hide} 17824 */ 17825 public boolean gatherTransparentRegion(Region region) { 17826 final AttachInfo attachInfo = mAttachInfo; 17827 if (region != null && attachInfo != null) { 17828 final int pflags = mPrivateFlags; 17829 if ((pflags & PFLAG_SKIP_DRAW) == 0) { 17830 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 17831 // remove it from the transparent region. 17832 final int[] location = attachInfo.mTransparentLocation; 17833 getLocationInWindow(location); 17834 region.op(location[0], location[1], location[0] + mRight - mLeft, 17835 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 17836 } else if ((pflags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null && 17837 mBackground.getOpacity() != PixelFormat.TRANSPARENT) { 17838 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 17839 // exists, so we remove the background drawable's non-transparent 17840 // parts from this transparent region. 17841 applyDrawableToTransparentRegion(mBackground, region); 17842 } 17843 } 17844 return true; 17845 } 17846 17847 /** 17848 * Play a sound effect for this view. 17849 * 17850 * <p>The framework will play sound effects for some built in actions, such as 17851 * clicking, but you may wish to play these effects in your widget, 17852 * for instance, for internal navigation. 17853 * 17854 * <p>The sound effect will only be played if sound effects are enabled by the user, and 17855 * {@link #isSoundEffectsEnabled()} is true. 17856 * 17857 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 17858 */ 17859 public void playSoundEffect(int soundConstant) { 17860 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 17861 return; 17862 } 17863 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 17864 } 17865 17866 /** 17867 * BZZZTT!!1! 17868 * 17869 * <p>Provide haptic feedback to the user for this view. 17870 * 17871 * <p>The framework will provide haptic feedback for some built in actions, 17872 * such as long presses, but you may wish to provide feedback for your 17873 * own widget. 17874 * 17875 * <p>The feedback will only be performed if 17876 * {@link #isHapticFeedbackEnabled()} is true. 17877 * 17878 * @param feedbackConstant One of the constants defined in 17879 * {@link HapticFeedbackConstants} 17880 */ 17881 public boolean performHapticFeedback(int feedbackConstant) { 17882 return performHapticFeedback(feedbackConstant, 0); 17883 } 17884 17885 /** 17886 * BZZZTT!!1! 17887 * 17888 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 17889 * 17890 * @param feedbackConstant One of the constants defined in 17891 * {@link HapticFeedbackConstants} 17892 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 17893 */ 17894 public boolean performHapticFeedback(int feedbackConstant, int flags) { 17895 if (mAttachInfo == null) { 17896 return false; 17897 } 17898 //noinspection SimplifiableIfStatement 17899 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 17900 && !isHapticFeedbackEnabled()) { 17901 return false; 17902 } 17903 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 17904 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 17905 } 17906 17907 /** 17908 * Request that the visibility of the status bar or other screen/window 17909 * decorations be changed. 17910 * 17911 * <p>This method is used to put the over device UI into temporary modes 17912 * where the user's attention is focused more on the application content, 17913 * by dimming or hiding surrounding system affordances. This is typically 17914 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 17915 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 17916 * to be placed behind the action bar (and with these flags other system 17917 * affordances) so that smooth transitions between hiding and showing them 17918 * can be done. 17919 * 17920 * <p>Two representative examples of the use of system UI visibility is 17921 * implementing a content browsing application (like a magazine reader) 17922 * and a video playing application. 17923 * 17924 * <p>The first code shows a typical implementation of a View in a content 17925 * browsing application. In this implementation, the application goes 17926 * into a content-oriented mode by hiding the status bar and action bar, 17927 * and putting the navigation elements into lights out mode. The user can 17928 * then interact with content while in this mode. Such an application should 17929 * provide an easy way for the user to toggle out of the mode (such as to 17930 * check information in the status bar or access notifications). In the 17931 * implementation here, this is done simply by tapping on the content. 17932 * 17933 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 17934 * content} 17935 * 17936 * <p>This second code sample shows a typical implementation of a View 17937 * in a video playing application. In this situation, while the video is 17938 * playing the application would like to go into a complete full-screen mode, 17939 * to use as much of the display as possible for the video. When in this state 17940 * the user can not interact with the application; the system intercepts 17941 * touching on the screen to pop the UI out of full screen mode. See 17942 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 17943 * 17944 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 17945 * content} 17946 * 17947 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 17948 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 17949 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 17950 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_IMMERSIVE}, 17951 * and {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY}. 17952 */ 17953 public void setSystemUiVisibility(int visibility) { 17954 if (visibility != mSystemUiVisibility) { 17955 mSystemUiVisibility = visibility; 17956 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 17957 mParent.recomputeViewAttributes(this); 17958 } 17959 } 17960 } 17961 17962 /** 17963 * Returns the last {@link #setSystemUiVisibility(int)} that this view has requested. 17964 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 17965 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 17966 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 17967 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_IMMERSIVE}, 17968 * and {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY}. 17969 */ 17970 public int getSystemUiVisibility() { 17971 return mSystemUiVisibility; 17972 } 17973 17974 /** 17975 * Returns the current system UI visibility that is currently set for 17976 * the entire window. This is the combination of the 17977 * {@link #setSystemUiVisibility(int)} values supplied by all of the 17978 * views in the window. 17979 */ 17980 public int getWindowSystemUiVisibility() { 17981 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 17982 } 17983 17984 /** 17985 * Override to find out when the window's requested system UI visibility 17986 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 17987 * This is different from the callbacks received through 17988 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 17989 * in that this is only telling you about the local request of the window, 17990 * not the actual values applied by the system. 17991 */ 17992 public void onWindowSystemUiVisibilityChanged(int visible) { 17993 } 17994 17995 /** 17996 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 17997 * the view hierarchy. 17998 */ 17999 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 18000 onWindowSystemUiVisibilityChanged(visible); 18001 } 18002 18003 /** 18004 * Set a listener to receive callbacks when the visibility of the system bar changes. 18005 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 18006 */ 18007 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 18008 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 18009 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 18010 mParent.recomputeViewAttributes(this); 18011 } 18012 } 18013 18014 /** 18015 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 18016 * the view hierarchy. 18017 */ 18018 public void dispatchSystemUiVisibilityChanged(int visibility) { 18019 ListenerInfo li = mListenerInfo; 18020 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 18021 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 18022 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 18023 } 18024 } 18025 18026 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 18027 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 18028 if (val != mSystemUiVisibility) { 18029 setSystemUiVisibility(val); 18030 return true; 18031 } 18032 return false; 18033 } 18034 18035 /** @hide */ 18036 public void setDisabledSystemUiVisibility(int flags) { 18037 if (mAttachInfo != null) { 18038 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 18039 mAttachInfo.mDisabledSystemUiVisibility = flags; 18040 if (mParent != null) { 18041 mParent.recomputeViewAttributes(this); 18042 } 18043 } 18044 } 18045 } 18046 18047 /** 18048 * Creates an image that the system displays during the drag and drop 18049 * operation. This is called a "drag shadow". The default implementation 18050 * for a DragShadowBuilder based on a View returns an image that has exactly the same 18051 * appearance as the given View. The default also positions the center of the drag shadow 18052 * directly under the touch point. If no View is provided (the constructor with no parameters 18053 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 18054 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 18055 * default is an invisible drag shadow. 18056 * <p> 18057 * You are not required to use the View you provide to the constructor as the basis of the 18058 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 18059 * anything you want as the drag shadow. 18060 * </p> 18061 * <p> 18062 * You pass a DragShadowBuilder object to the system when you start the drag. The system 18063 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 18064 * size and position of the drag shadow. It uses this data to construct a 18065 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 18066 * so that your application can draw the shadow image in the Canvas. 18067 * </p> 18068 * 18069 * <div class="special reference"> 18070 * <h3>Developer Guides</h3> 18071 * <p>For a guide to implementing drag and drop features, read the 18072 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 18073 * </div> 18074 */ 18075 public static class DragShadowBuilder { 18076 private final WeakReference<View> mView; 18077 18078 /** 18079 * Constructs a shadow image builder based on a View. By default, the resulting drag 18080 * shadow will have the same appearance and dimensions as the View, with the touch point 18081 * over the center of the View. 18082 * @param view A View. Any View in scope can be used. 18083 */ 18084 public DragShadowBuilder(View view) { 18085 mView = new WeakReference<View>(view); 18086 } 18087 18088 /** 18089 * Construct a shadow builder object with no associated View. This 18090 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 18091 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 18092 * to supply the drag shadow's dimensions and appearance without 18093 * reference to any View object. If they are not overridden, then the result is an 18094 * invisible drag shadow. 18095 */ 18096 public DragShadowBuilder() { 18097 mView = new WeakReference<View>(null); 18098 } 18099 18100 /** 18101 * Returns the View object that had been passed to the 18102 * {@link #View.DragShadowBuilder(View)} 18103 * constructor. If that View parameter was {@code null} or if the 18104 * {@link #View.DragShadowBuilder()} 18105 * constructor was used to instantiate the builder object, this method will return 18106 * null. 18107 * 18108 * @return The View object associate with this builder object. 18109 */ 18110 @SuppressWarnings({"JavadocReference"}) 18111 final public View getView() { 18112 return mView.get(); 18113 } 18114 18115 /** 18116 * Provides the metrics for the shadow image. These include the dimensions of 18117 * the shadow image, and the point within that shadow that should 18118 * be centered under the touch location while dragging. 18119 * <p> 18120 * The default implementation sets the dimensions of the shadow to be the 18121 * same as the dimensions of the View itself and centers the shadow under 18122 * the touch point. 18123 * </p> 18124 * 18125 * @param shadowSize A {@link android.graphics.Point} containing the width and height 18126 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 18127 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 18128 * image. 18129 * 18130 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 18131 * shadow image that should be underneath the touch point during the drag and drop 18132 * operation. Your application must set {@link android.graphics.Point#x} to the 18133 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 18134 */ 18135 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 18136 final View view = mView.get(); 18137 if (view != null) { 18138 shadowSize.set(view.getWidth(), view.getHeight()); 18139 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 18140 } else { 18141 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 18142 } 18143 } 18144 18145 /** 18146 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 18147 * based on the dimensions it received from the 18148 * {@link #onProvideShadowMetrics(Point, Point)} callback. 18149 * 18150 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 18151 */ 18152 public void onDrawShadow(Canvas canvas) { 18153 final View view = mView.get(); 18154 if (view != null) { 18155 view.draw(canvas); 18156 } else { 18157 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 18158 } 18159 } 18160 } 18161 18162 /** 18163 * Starts a drag and drop operation. When your application calls this method, it passes a 18164 * {@link android.view.View.DragShadowBuilder} object to the system. The 18165 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 18166 * to get metrics for the drag shadow, and then calls the object's 18167 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 18168 * <p> 18169 * Once the system has the drag shadow, it begins the drag and drop operation by sending 18170 * drag events to all the View objects in your application that are currently visible. It does 18171 * this either by calling the View object's drag listener (an implementation of 18172 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 18173 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 18174 * Both are passed a {@link android.view.DragEvent} object that has a 18175 * {@link android.view.DragEvent#getAction()} value of 18176 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 18177 * </p> 18178 * <p> 18179 * Your application can invoke startDrag() on any attached View object. The View object does not 18180 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 18181 * be related to the View the user selected for dragging. 18182 * </p> 18183 * @param data A {@link android.content.ClipData} object pointing to the data to be 18184 * transferred by the drag and drop operation. 18185 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 18186 * drag shadow. 18187 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 18188 * drop operation. This Object is put into every DragEvent object sent by the system during the 18189 * current drag. 18190 * <p> 18191 * myLocalState is a lightweight mechanism for the sending information from the dragged View 18192 * to the target Views. For example, it can contain flags that differentiate between a 18193 * a copy operation and a move operation. 18194 * </p> 18195 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 18196 * so the parameter should be set to 0. 18197 * @return {@code true} if the method completes successfully, or 18198 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 18199 * do a drag, and so no drag operation is in progress. 18200 */ 18201 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 18202 Object myLocalState, int flags) { 18203 if (ViewDebug.DEBUG_DRAG) { 18204 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 18205 } 18206 boolean okay = false; 18207 18208 Point shadowSize = new Point(); 18209 Point shadowTouchPoint = new Point(); 18210 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 18211 18212 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 18213 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 18214 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 18215 } 18216 18217 if (ViewDebug.DEBUG_DRAG) { 18218 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 18219 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 18220 } 18221 Surface surface = new Surface(); 18222 try { 18223 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 18224 flags, shadowSize.x, shadowSize.y, surface); 18225 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 18226 + " surface=" + surface); 18227 if (token != null) { 18228 Canvas canvas = surface.lockCanvas(null); 18229 try { 18230 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 18231 shadowBuilder.onDrawShadow(canvas); 18232 } finally { 18233 surface.unlockCanvasAndPost(canvas); 18234 } 18235 18236 final ViewRootImpl root = getViewRootImpl(); 18237 18238 // Cache the local state object for delivery with DragEvents 18239 root.setLocalDragState(myLocalState); 18240 18241 // repurpose 'shadowSize' for the last touch point 18242 root.getLastTouchPoint(shadowSize); 18243 18244 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 18245 shadowSize.x, shadowSize.y, 18246 shadowTouchPoint.x, shadowTouchPoint.y, data); 18247 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 18248 18249 // Off and running! Release our local surface instance; the drag 18250 // shadow surface is now managed by the system process. 18251 surface.release(); 18252 } 18253 } catch (Exception e) { 18254 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 18255 surface.destroy(); 18256 } 18257 18258 return okay; 18259 } 18260 18261 /** 18262 * Handles drag events sent by the system following a call to 18263 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 18264 *<p> 18265 * When the system calls this method, it passes a 18266 * {@link android.view.DragEvent} object. A call to 18267 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 18268 * in DragEvent. The method uses these to determine what is happening in the drag and drop 18269 * operation. 18270 * @param event The {@link android.view.DragEvent} sent by the system. 18271 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 18272 * in DragEvent, indicating the type of drag event represented by this object. 18273 * @return {@code true} if the method was successful, otherwise {@code false}. 18274 * <p> 18275 * The method should return {@code true} in response to an action type of 18276 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 18277 * operation. 18278 * </p> 18279 * <p> 18280 * The method should also return {@code true} in response to an action type of 18281 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 18282 * {@code false} if it didn't. 18283 * </p> 18284 */ 18285 public boolean onDragEvent(DragEvent event) { 18286 return false; 18287 } 18288 18289 /** 18290 * Detects if this View is enabled and has a drag event listener. 18291 * If both are true, then it calls the drag event listener with the 18292 * {@link android.view.DragEvent} it received. If the drag event listener returns 18293 * {@code true}, then dispatchDragEvent() returns {@code true}. 18294 * <p> 18295 * For all other cases, the method calls the 18296 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 18297 * method and returns its result. 18298 * </p> 18299 * <p> 18300 * This ensures that a drag event is always consumed, even if the View does not have a drag 18301 * event listener. However, if the View has a listener and the listener returns true, then 18302 * onDragEvent() is not called. 18303 * </p> 18304 */ 18305 public boolean dispatchDragEvent(DragEvent event) { 18306 ListenerInfo li = mListenerInfo; 18307 //noinspection SimplifiableIfStatement 18308 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 18309 && li.mOnDragListener.onDrag(this, event)) { 18310 return true; 18311 } 18312 return onDragEvent(event); 18313 } 18314 18315 boolean canAcceptDrag() { 18316 return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0; 18317 } 18318 18319 /** 18320 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 18321 * it is ever exposed at all. 18322 * @hide 18323 */ 18324 public void onCloseSystemDialogs(String reason) { 18325 } 18326 18327 /** 18328 * Given a Drawable whose bounds have been set to draw into this view, 18329 * update a Region being computed for 18330 * {@link #gatherTransparentRegion(android.graphics.Region)} so 18331 * that any non-transparent parts of the Drawable are removed from the 18332 * given transparent region. 18333 * 18334 * @param dr The Drawable whose transparency is to be applied to the region. 18335 * @param region A Region holding the current transparency information, 18336 * where any parts of the region that are set are considered to be 18337 * transparent. On return, this region will be modified to have the 18338 * transparency information reduced by the corresponding parts of the 18339 * Drawable that are not transparent. 18340 * {@hide} 18341 */ 18342 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 18343 if (DBG) { 18344 Log.i("View", "Getting transparent region for: " + this); 18345 } 18346 final Region r = dr.getTransparentRegion(); 18347 final Rect db = dr.getBounds(); 18348 final AttachInfo attachInfo = mAttachInfo; 18349 if (r != null && attachInfo != null) { 18350 final int w = getRight()-getLeft(); 18351 final int h = getBottom()-getTop(); 18352 if (db.left > 0) { 18353 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 18354 r.op(0, 0, db.left, h, Region.Op.UNION); 18355 } 18356 if (db.right < w) { 18357 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 18358 r.op(db.right, 0, w, h, Region.Op.UNION); 18359 } 18360 if (db.top > 0) { 18361 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 18362 r.op(0, 0, w, db.top, Region.Op.UNION); 18363 } 18364 if (db.bottom < h) { 18365 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 18366 r.op(0, db.bottom, w, h, Region.Op.UNION); 18367 } 18368 final int[] location = attachInfo.mTransparentLocation; 18369 getLocationInWindow(location); 18370 r.translate(location[0], location[1]); 18371 region.op(r, Region.Op.INTERSECT); 18372 } else { 18373 region.op(db, Region.Op.DIFFERENCE); 18374 } 18375 } 18376 18377 private void checkForLongClick(int delayOffset) { 18378 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 18379 mHasPerformedLongPress = false; 18380 18381 if (mPendingCheckForLongPress == null) { 18382 mPendingCheckForLongPress = new CheckForLongPress(); 18383 } 18384 mPendingCheckForLongPress.rememberWindowAttachCount(); 18385 postDelayed(mPendingCheckForLongPress, 18386 ViewConfiguration.getLongPressTimeout() - delayOffset); 18387 } 18388 } 18389 18390 /** 18391 * Inflate a view from an XML resource. This convenience method wraps the {@link 18392 * LayoutInflater} class, which provides a full range of options for view inflation. 18393 * 18394 * @param context The Context object for your activity or application. 18395 * @param resource The resource ID to inflate 18396 * @param root A view group that will be the parent. Used to properly inflate the 18397 * layout_* parameters. 18398 * @see LayoutInflater 18399 */ 18400 public static View inflate(Context context, int resource, ViewGroup root) { 18401 LayoutInflater factory = LayoutInflater.from(context); 18402 return factory.inflate(resource, root); 18403 } 18404 18405 /** 18406 * Scroll the view with standard behavior for scrolling beyond the normal 18407 * content boundaries. Views that call this method should override 18408 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 18409 * results of an over-scroll operation. 18410 * 18411 * Views can use this method to handle any touch or fling-based scrolling. 18412 * 18413 * @param deltaX Change in X in pixels 18414 * @param deltaY Change in Y in pixels 18415 * @param scrollX Current X scroll value in pixels before applying deltaX 18416 * @param scrollY Current Y scroll value in pixels before applying deltaY 18417 * @param scrollRangeX Maximum content scroll range along the X axis 18418 * @param scrollRangeY Maximum content scroll range along the Y axis 18419 * @param maxOverScrollX Number of pixels to overscroll by in either direction 18420 * along the X axis. 18421 * @param maxOverScrollY Number of pixels to overscroll by in either direction 18422 * along the Y axis. 18423 * @param isTouchEvent true if this scroll operation is the result of a touch event. 18424 * @return true if scrolling was clamped to an over-scroll boundary along either 18425 * axis, false otherwise. 18426 */ 18427 @SuppressWarnings({"UnusedParameters"}) 18428 protected boolean overScrollBy(int deltaX, int deltaY, 18429 int scrollX, int scrollY, 18430 int scrollRangeX, int scrollRangeY, 18431 int maxOverScrollX, int maxOverScrollY, 18432 boolean isTouchEvent) { 18433 final int overScrollMode = mOverScrollMode; 18434 final boolean canScrollHorizontal = 18435 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 18436 final boolean canScrollVertical = 18437 computeVerticalScrollRange() > computeVerticalScrollExtent(); 18438 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 18439 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 18440 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 18441 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 18442 18443 int newScrollX = scrollX + deltaX; 18444 if (!overScrollHorizontal) { 18445 maxOverScrollX = 0; 18446 } 18447 18448 int newScrollY = scrollY + deltaY; 18449 if (!overScrollVertical) { 18450 maxOverScrollY = 0; 18451 } 18452 18453 // Clamp values if at the limits and record 18454 final int left = -maxOverScrollX; 18455 final int right = maxOverScrollX + scrollRangeX; 18456 final int top = -maxOverScrollY; 18457 final int bottom = maxOverScrollY + scrollRangeY; 18458 18459 boolean clampedX = false; 18460 if (newScrollX > right) { 18461 newScrollX = right; 18462 clampedX = true; 18463 } else if (newScrollX < left) { 18464 newScrollX = left; 18465 clampedX = true; 18466 } 18467 18468 boolean clampedY = false; 18469 if (newScrollY > bottom) { 18470 newScrollY = bottom; 18471 clampedY = true; 18472 } else if (newScrollY < top) { 18473 newScrollY = top; 18474 clampedY = true; 18475 } 18476 18477 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 18478 18479 return clampedX || clampedY; 18480 } 18481 18482 /** 18483 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 18484 * respond to the results of an over-scroll operation. 18485 * 18486 * @param scrollX New X scroll value in pixels 18487 * @param scrollY New Y scroll value in pixels 18488 * @param clampedX True if scrollX was clamped to an over-scroll boundary 18489 * @param clampedY True if scrollY was clamped to an over-scroll boundary 18490 */ 18491 protected void onOverScrolled(int scrollX, int scrollY, 18492 boolean clampedX, boolean clampedY) { 18493 // Intentionally empty. 18494 } 18495 18496 /** 18497 * Returns the over-scroll mode for this view. The result will be 18498 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 18499 * (allow over-scrolling only if the view content is larger than the container), 18500 * or {@link #OVER_SCROLL_NEVER}. 18501 * 18502 * @return This view's over-scroll mode. 18503 */ 18504 public int getOverScrollMode() { 18505 return mOverScrollMode; 18506 } 18507 18508 /** 18509 * Set the over-scroll mode for this view. Valid over-scroll modes are 18510 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 18511 * (allow over-scrolling only if the view content is larger than the container), 18512 * or {@link #OVER_SCROLL_NEVER}. 18513 * 18514 * Setting the over-scroll mode of a view will have an effect only if the 18515 * view is capable of scrolling. 18516 * 18517 * @param overScrollMode The new over-scroll mode for this view. 18518 */ 18519 public void setOverScrollMode(int overScrollMode) { 18520 if (overScrollMode != OVER_SCROLL_ALWAYS && 18521 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 18522 overScrollMode != OVER_SCROLL_NEVER) { 18523 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 18524 } 18525 mOverScrollMode = overScrollMode; 18526 } 18527 18528 /** 18529 * Enable or disable nested scrolling for this view. 18530 * 18531 * <p>If this property is set to true the view will be permitted to initiate nested 18532 * scrolling operations with a compatible parent view in the current hierarchy. If this 18533 * view does not implement nested scrolling this will have no effect. Disabling nested scrolling 18534 * while a nested scroll is in progress has the effect of {@link #stopNestedScroll() stopping} 18535 * the nested scroll.</p> 18536 * 18537 * @param enabled true to enable nested scrolling, false to disable 18538 * 18539 * @see #isNestedScrollingEnabled() 18540 */ 18541 public void setNestedScrollingEnabled(boolean enabled) { 18542 if (enabled) { 18543 mPrivateFlags3 |= PFLAG3_NESTED_SCROLLING_ENABLED; 18544 } else { 18545 stopNestedScroll(); 18546 mPrivateFlags3 &= ~PFLAG3_NESTED_SCROLLING_ENABLED; 18547 } 18548 } 18549 18550 /** 18551 * Returns true if nested scrolling is enabled for this view. 18552 * 18553 * <p>If nested scrolling is enabled and this View class implementation supports it, 18554 * this view will act as a nested scrolling child view when applicable, forwarding data 18555 * about the scroll operation in progress to a compatible and cooperating nested scrolling 18556 * parent.</p> 18557 * 18558 * @return true if nested scrolling is enabled 18559 * 18560 * @see #setNestedScrollingEnabled(boolean) 18561 */ 18562 public boolean isNestedScrollingEnabled() { 18563 return (mPrivateFlags3 & PFLAG3_NESTED_SCROLLING_ENABLED) == 18564 PFLAG3_NESTED_SCROLLING_ENABLED; 18565 } 18566 18567 /** 18568 * Begin a nestable scroll operation along the given axes. 18569 * 18570 * <p>A view starting a nested scroll promises to abide by the following contract:</p> 18571 * 18572 * <p>The view will call startNestedScroll upon initiating a scroll operation. In the case 18573 * of a touch scroll this corresponds to the initial {@link MotionEvent#ACTION_DOWN}. 18574 * In the case of touch scrolling the nested scroll will be terminated automatically in 18575 * the same manner as {@link ViewParent#requestDisallowInterceptTouchEvent(boolean)}. 18576 * In the event of programmatic scrolling the caller must explicitly call 18577 * {@link #stopNestedScroll()} to indicate the end of the nested scroll.</p> 18578 * 18579 * <p>If <code>startNestedScroll</code> returns true, a cooperative parent was found. 18580 * If it returns false the caller may ignore the rest of this contract until the next scroll. 18581 * Calling startNestedScroll while a nested scroll is already in progress will return true.</p> 18582 * 18583 * <p>At each incremental step of the scroll the caller should invoke 18584 * {@link #dispatchNestedPreScroll(int, int, int[], int[]) dispatchNestedPreScroll} 18585 * once it has calculated the requested scrolling delta. If it returns true the nested scrolling 18586 * parent at least partially consumed the scroll and the caller should adjust the amount it 18587 * scrolls by.</p> 18588 * 18589 * <p>After applying the remainder of the scroll delta the caller should invoke 18590 * {@link #dispatchNestedScroll(int, int, int, int, int[]) dispatchNestedScroll}, passing 18591 * both the delta consumed and the delta unconsumed. A nested scrolling parent may treat 18592 * these values differently. See {@link ViewParent#onNestedScroll(View, int, int, int, int)}. 18593 * </p> 18594 * 18595 * @param axes Flags consisting of a combination of {@link #SCROLL_AXIS_HORIZONTAL} and/or 18596 * {@link #SCROLL_AXIS_VERTICAL}. 18597 * @return true if a cooperative parent was found and nested scrolling has been enabled for 18598 * the current gesture. 18599 * 18600 * @see #stopNestedScroll() 18601 * @see #dispatchNestedPreScroll(int, int, int[], int[]) 18602 * @see #dispatchNestedScroll(int, int, int, int, int[]) 18603 */ 18604 public boolean startNestedScroll(int axes) { 18605 if (hasNestedScrollingParent()) { 18606 // Already in progress 18607 return true; 18608 } 18609 if (isNestedScrollingEnabled()) { 18610 ViewParent p = getParent(); 18611 View child = this; 18612 while (p != null) { 18613 try { 18614 if (p.onStartNestedScroll(child, this, axes)) { 18615 mNestedScrollingParent = p; 18616 p.onNestedScrollAccepted(child, this, axes); 18617 return true; 18618 } 18619 } catch (AbstractMethodError e) { 18620 Log.e(VIEW_LOG_TAG, "ViewParent " + p + " does not implement interface " + 18621 "method onStartNestedScroll", e); 18622 // Allow the search upward to continue 18623 } 18624 if (p instanceof View) { 18625 child = (View) p; 18626 } 18627 p = p.getParent(); 18628 } 18629 } 18630 return false; 18631 } 18632 18633 /** 18634 * Stop a nested scroll in progress. 18635 * 18636 * <p>Calling this method when a nested scroll is not currently in progress is harmless.</p> 18637 * 18638 * @see #startNestedScroll(int) 18639 */ 18640 public void stopNestedScroll() { 18641 if (mNestedScrollingParent != null) { 18642 mNestedScrollingParent.onStopNestedScroll(this); 18643 mNestedScrollingParent = null; 18644 } 18645 } 18646 18647 /** 18648 * Returns true if this view has a nested scrolling parent. 18649 * 18650 * <p>The presence of a nested scrolling parent indicates that this view has initiated 18651 * a nested scroll and it was accepted by an ancestor view further up the view hierarchy.</p> 18652 * 18653 * @return whether this view has a nested scrolling parent 18654 */ 18655 public boolean hasNestedScrollingParent() { 18656 return mNestedScrollingParent != null; 18657 } 18658 18659 /** 18660 * Dispatch one step of a nested scroll in progress. 18661 * 18662 * <p>Implementations of views that support nested scrolling should call this to report 18663 * info about a scroll in progress to the current nested scrolling parent. If a nested scroll 18664 * is not currently in progress or nested scrolling is not 18665 * {@link #isNestedScrollingEnabled() enabled} for this view this method does nothing.</p> 18666 * 18667 * <p>Compatible View implementations should also call 18668 * {@link #dispatchNestedPreScroll(int, int, int[], int[]) dispatchNestedPreScroll} before 18669 * consuming a component of the scroll event themselves.</p> 18670 * 18671 * @param dxConsumed Horizontal distance in pixels consumed by this view during this scroll step 18672 * @param dyConsumed Vertical distance in pixels consumed by this view during this scroll step 18673 * @param dxUnconsumed Horizontal scroll distance in pixels not consumed by this view 18674 * @param dyUnconsumed Horizontal scroll distance in pixels not consumed by this view 18675 * @param offsetInWindow Optional. If not null, on return this will contain the offset 18676 * in local view coordinates of this view from before this operation 18677 * to after it completes. View implementations may use this to adjust 18678 * expected input coordinate tracking. 18679 * @return true if the event was dispatched, false if it could not be dispatched. 18680 * @see #dispatchNestedPreScroll(int, int, int[], int[]) 18681 */ 18682 public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, 18683 int dxUnconsumed, int dyUnconsumed, int[] offsetInWindow) { 18684 if (isNestedScrollingEnabled() && mNestedScrollingParent != null) { 18685 if (dxConsumed != 0 || dyConsumed != 0 || dxUnconsumed != 0 || dyUnconsumed != 0) { 18686 int startX = 0; 18687 int startY = 0; 18688 if (offsetInWindow != null) { 18689 getLocationInWindow(offsetInWindow); 18690 startX = offsetInWindow[0]; 18691 startY = offsetInWindow[1]; 18692 } 18693 18694 mNestedScrollingParent.onNestedScroll(this, dxConsumed, dyConsumed, 18695 dxUnconsumed, dyUnconsumed); 18696 18697 if (offsetInWindow != null) { 18698 getLocationInWindow(offsetInWindow); 18699 offsetInWindow[0] -= startX; 18700 offsetInWindow[1] -= startY; 18701 } 18702 return true; 18703 } else if (offsetInWindow != null) { 18704 // No motion, no dispatch. Keep offsetInWindow up to date. 18705 offsetInWindow[0] = 0; 18706 offsetInWindow[1] = 0; 18707 } 18708 } 18709 return false; 18710 } 18711 18712 /** 18713 * Dispatch one step of a nested scroll in progress before this view consumes any portion of it. 18714 * 18715 * <p>Nested pre-scroll events are to nested scroll events what touch intercept is to touch. 18716 * <code>dispatchNestedPreScroll</code> offers an opportunity for the parent view in a nested 18717 * scrolling operation to consume some or all of the scroll operation before the child view 18718 * consumes it.</p> 18719 * 18720 * @param dx Horizontal scroll distance in pixels 18721 * @param dy Vertical scroll distance in pixels 18722 * @param consumed Output. If not null, consumed[0] will contain the consumed component of dx 18723 * and consumed[1] the consumed dy. 18724 * @param offsetInWindow Optional. If not null, on return this will contain the offset 18725 * in local view coordinates of this view from before this operation 18726 * to after it completes. View implementations may use this to adjust 18727 * expected input coordinate tracking. 18728 * @return true if the parent consumed some or all of the scroll delta 18729 * @see #dispatchNestedScroll(int, int, int, int, int[]) 18730 */ 18731 public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) { 18732 if (isNestedScrollingEnabled() && mNestedScrollingParent != null) { 18733 if (dx != 0 || dy != 0) { 18734 int startX = 0; 18735 int startY = 0; 18736 if (offsetInWindow != null) { 18737 getLocationInWindow(offsetInWindow); 18738 startX = offsetInWindow[0]; 18739 startY = offsetInWindow[1]; 18740 } 18741 18742 if (consumed == null) { 18743 if (mTempNestedScrollConsumed == null) { 18744 mTempNestedScrollConsumed = new int[2]; 18745 } 18746 consumed = mTempNestedScrollConsumed; 18747 } 18748 consumed[0] = 0; 18749 consumed[1] = 0; 18750 mNestedScrollingParent.onNestedPreScroll(this, dx, dy, consumed); 18751 18752 if (offsetInWindow != null) { 18753 getLocationInWindow(offsetInWindow); 18754 offsetInWindow[0] -= startX; 18755 offsetInWindow[1] -= startY; 18756 } 18757 return consumed[0] != 0 || consumed[1] != 0; 18758 } else if (offsetInWindow != null) { 18759 offsetInWindow[0] = 0; 18760 offsetInWindow[1] = 0; 18761 } 18762 } 18763 return false; 18764 } 18765 18766 /** 18767 * Dispatch a fling to a nested scrolling parent. 18768 * 18769 * <p>This method should be used to indicate that a nested scrolling child has detected 18770 * suitable conditions for a fling. Generally this means that a touch scroll has ended with a 18771 * {@link VelocityTracker velocity} in the direction of scrolling that meets or exceeds 18772 * the {@link ViewConfiguration#getScaledMinimumFlingVelocity() minimum fling velocity} 18773 * along a scrollable axis.</p> 18774 * 18775 * <p>If a nested scrolling child view would normally fling but it is at the edge of 18776 * its own content, it can use this method to delegate the fling to its nested scrolling 18777 * parent instead. The parent may optionally consume the fling or observe a child fling.</p> 18778 * 18779 * @param velocityX Horizontal fling velocity in pixels per second 18780 * @param velocityY Vertical fling velocity in pixels per second 18781 * @param consumed true if the child consumed the fling, false otherwise 18782 * @return true if the nested scrolling parent consumed or otherwise reacted to the fling 18783 */ 18784 public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) { 18785 if (isNestedScrollingEnabled() && mNestedScrollingParent != null) { 18786 return mNestedScrollingParent.onNestedFling(this, velocityX, velocityY, consumed); 18787 } 18788 return false; 18789 } 18790 18791 /** 18792 * Dispatch a fling to a nested scrolling parent before it is processed by this view. 18793 * 18794 * <p>Nested pre-fling events are to nested fling events what touch intercept is to touch 18795 * and what nested pre-scroll is to nested scroll. <code>dispatchNestedPreFling</code> 18796 * offsets an opportunity for the parent view in a nested fling to fully consume the fling 18797 * before the child view consumes it. If this method returns <code>true</code>, a nested 18798 * parent view consumed the fling and this view should not scroll as a result.</p> 18799 * 18800 * <p>For a better user experience, only one view in a nested scrolling chain should consume 18801 * the fling at a time. If a parent view consumed the fling this method will return false. 18802 * Custom view implementations should account for this in two ways:</p> 18803 * 18804 * <ul> 18805 * <li>If a custom view is paged and needs to settle to a fixed page-point, do not 18806 * call <code>dispatchNestedPreFling</code>; consume the fling and settle to a valid 18807 * position regardless.</li> 18808 * <li>If a nested parent does consume the fling, this view should not scroll at all, 18809 * even to settle back to a valid idle position.</li> 18810 * </ul> 18811 * 18812 * <p>Views should also not offer fling velocities to nested parent views along an axis 18813 * where scrolling is not currently supported; a {@link android.widget.ScrollView ScrollView} 18814 * should not offer a horizontal fling velocity to its parents since scrolling along that 18815 * axis is not permitted and carrying velocity along that motion does not make sense.</p> 18816 * 18817 * @param velocityX Horizontal fling velocity in pixels per second 18818 * @param velocityY Vertical fling velocity in pixels per second 18819 * @return true if a nested scrolling parent consumed the fling 18820 */ 18821 public boolean dispatchNestedPreFling(float velocityX, float velocityY) { 18822 if (isNestedScrollingEnabled() && mNestedScrollingParent != null) { 18823 return mNestedScrollingParent.onNestedPreFling(this, velocityX, velocityY); 18824 } 18825 return false; 18826 } 18827 18828 /** 18829 * Gets a scale factor that determines the distance the view should scroll 18830 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 18831 * @return The vertical scroll scale factor. 18832 * @hide 18833 */ 18834 protected float getVerticalScrollFactor() { 18835 if (mVerticalScrollFactor == 0) { 18836 TypedValue outValue = new TypedValue(); 18837 if (!mContext.getTheme().resolveAttribute( 18838 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 18839 throw new IllegalStateException( 18840 "Expected theme to define listPreferredItemHeight."); 18841 } 18842 mVerticalScrollFactor = outValue.getDimension( 18843 mContext.getResources().getDisplayMetrics()); 18844 } 18845 return mVerticalScrollFactor; 18846 } 18847 18848 /** 18849 * Gets a scale factor that determines the distance the view should scroll 18850 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 18851 * @return The horizontal scroll scale factor. 18852 * @hide 18853 */ 18854 protected float getHorizontalScrollFactor() { 18855 // TODO: Should use something else. 18856 return getVerticalScrollFactor(); 18857 } 18858 18859 /** 18860 * Return the value specifying the text direction or policy that was set with 18861 * {@link #setTextDirection(int)}. 18862 * 18863 * @return the defined text direction. It can be one of: 18864 * 18865 * {@link #TEXT_DIRECTION_INHERIT}, 18866 * {@link #TEXT_DIRECTION_FIRST_STRONG} 18867 * {@link #TEXT_DIRECTION_ANY_RTL}, 18868 * {@link #TEXT_DIRECTION_LTR}, 18869 * {@link #TEXT_DIRECTION_RTL}, 18870 * {@link #TEXT_DIRECTION_LOCALE} 18871 * 18872 * @attr ref android.R.styleable#View_textDirection 18873 * 18874 * @hide 18875 */ 18876 @ViewDebug.ExportedProperty(category = "text", mapping = { 18877 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 18878 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 18879 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 18880 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 18881 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 18882 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 18883 }) 18884 public int getRawTextDirection() { 18885 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 18886 } 18887 18888 /** 18889 * Set the text direction. 18890 * 18891 * @param textDirection the direction to set. Should be one of: 18892 * 18893 * {@link #TEXT_DIRECTION_INHERIT}, 18894 * {@link #TEXT_DIRECTION_FIRST_STRONG} 18895 * {@link #TEXT_DIRECTION_ANY_RTL}, 18896 * {@link #TEXT_DIRECTION_LTR}, 18897 * {@link #TEXT_DIRECTION_RTL}, 18898 * {@link #TEXT_DIRECTION_LOCALE} 18899 * 18900 * Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution 18901 * proceeds up the parent chain of the view to get the value. If there is no parent, then it will 18902 * return the default {@link #TEXT_DIRECTION_FIRST_STRONG}. 18903 * 18904 * @attr ref android.R.styleable#View_textDirection 18905 */ 18906 public void setTextDirection(int textDirection) { 18907 if (getRawTextDirection() != textDirection) { 18908 // Reset the current text direction and the resolved one 18909 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 18910 resetResolvedTextDirection(); 18911 // Set the new text direction 18912 mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK); 18913 // Do resolution 18914 resolveTextDirection(); 18915 // Notify change 18916 onRtlPropertiesChanged(getLayoutDirection()); 18917 // Refresh 18918 requestLayout(); 18919 invalidate(true); 18920 } 18921 } 18922 18923 /** 18924 * Return the resolved text direction. 18925 * 18926 * @return the resolved text direction. Returns one of: 18927 * 18928 * {@link #TEXT_DIRECTION_FIRST_STRONG} 18929 * {@link #TEXT_DIRECTION_ANY_RTL}, 18930 * {@link #TEXT_DIRECTION_LTR}, 18931 * {@link #TEXT_DIRECTION_RTL}, 18932 * {@link #TEXT_DIRECTION_LOCALE} 18933 * 18934 * @attr ref android.R.styleable#View_textDirection 18935 */ 18936 @ViewDebug.ExportedProperty(category = "text", mapping = { 18937 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 18938 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 18939 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 18940 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 18941 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 18942 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 18943 }) 18944 public int getTextDirection() { 18945 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 18946 } 18947 18948 /** 18949 * Resolve the text direction. 18950 * 18951 * @return true if resolution has been done, false otherwise. 18952 * 18953 * @hide 18954 */ 18955 public boolean resolveTextDirection() { 18956 // Reset any previous text direction resolution 18957 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 18958 18959 if (hasRtlSupport()) { 18960 // Set resolved text direction flag depending on text direction flag 18961 final int textDirection = getRawTextDirection(); 18962 switch(textDirection) { 18963 case TEXT_DIRECTION_INHERIT: 18964 if (!canResolveTextDirection()) { 18965 // We cannot do the resolution if there is no parent, so use the default one 18966 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 18967 // Resolution will need to happen again later 18968 return false; 18969 } 18970 18971 // Parent has not yet resolved, so we still return the default 18972 try { 18973 if (!mParent.isTextDirectionResolved()) { 18974 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 18975 // Resolution will need to happen again later 18976 return false; 18977 } 18978 } catch (AbstractMethodError e) { 18979 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 18980 " does not fully implement ViewParent", e); 18981 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED | 18982 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 18983 return true; 18984 } 18985 18986 // Set current resolved direction to the same value as the parent's one 18987 int parentResolvedDirection; 18988 try { 18989 parentResolvedDirection = mParent.getTextDirection(); 18990 } catch (AbstractMethodError e) { 18991 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 18992 " does not fully implement ViewParent", e); 18993 parentResolvedDirection = TEXT_DIRECTION_LTR; 18994 } 18995 switch (parentResolvedDirection) { 18996 case TEXT_DIRECTION_FIRST_STRONG: 18997 case TEXT_DIRECTION_ANY_RTL: 18998 case TEXT_DIRECTION_LTR: 18999 case TEXT_DIRECTION_RTL: 19000 case TEXT_DIRECTION_LOCALE: 19001 mPrivateFlags2 |= 19002 (parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 19003 break; 19004 default: 19005 // Default resolved direction is "first strong" heuristic 19006 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 19007 } 19008 break; 19009 case TEXT_DIRECTION_FIRST_STRONG: 19010 case TEXT_DIRECTION_ANY_RTL: 19011 case TEXT_DIRECTION_LTR: 19012 case TEXT_DIRECTION_RTL: 19013 case TEXT_DIRECTION_LOCALE: 19014 // Resolved direction is the same as text direction 19015 mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 19016 break; 19017 default: 19018 // Default resolved direction is "first strong" heuristic 19019 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 19020 } 19021 } else { 19022 // Default resolved direction is "first strong" heuristic 19023 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 19024 } 19025 19026 // Set to resolved 19027 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED; 19028 return true; 19029 } 19030 19031 /** 19032 * Check if text direction resolution can be done. 19033 * 19034 * @return true if text direction resolution can be done otherwise return false. 19035 */ 19036 public boolean canResolveTextDirection() { 19037 switch (getRawTextDirection()) { 19038 case TEXT_DIRECTION_INHERIT: 19039 if (mParent != null) { 19040 try { 19041 return mParent.canResolveTextDirection(); 19042 } catch (AbstractMethodError e) { 19043 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 19044 " does not fully implement ViewParent", e); 19045 } 19046 } 19047 return false; 19048 19049 default: 19050 return true; 19051 } 19052 } 19053 19054 /** 19055 * Reset resolved text direction. Text direction will be resolved during a call to 19056 * {@link #onMeasure(int, int)}. 19057 * 19058 * @hide 19059 */ 19060 public void resetResolvedTextDirection() { 19061 // Reset any previous text direction resolution 19062 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 19063 // Set to default value 19064 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 19065 } 19066 19067 /** 19068 * @return true if text direction is inherited. 19069 * 19070 * @hide 19071 */ 19072 public boolean isTextDirectionInherited() { 19073 return (getRawTextDirection() == TEXT_DIRECTION_INHERIT); 19074 } 19075 19076 /** 19077 * @return true if text direction is resolved. 19078 */ 19079 public boolean isTextDirectionResolved() { 19080 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED; 19081 } 19082 19083 /** 19084 * Return the value specifying the text alignment or policy that was set with 19085 * {@link #setTextAlignment(int)}. 19086 * 19087 * @return the defined text alignment. It can be one of: 19088 * 19089 * {@link #TEXT_ALIGNMENT_INHERIT}, 19090 * {@link #TEXT_ALIGNMENT_GRAVITY}, 19091 * {@link #TEXT_ALIGNMENT_CENTER}, 19092 * {@link #TEXT_ALIGNMENT_TEXT_START}, 19093 * {@link #TEXT_ALIGNMENT_TEXT_END}, 19094 * {@link #TEXT_ALIGNMENT_VIEW_START}, 19095 * {@link #TEXT_ALIGNMENT_VIEW_END} 19096 * 19097 * @attr ref android.R.styleable#View_textAlignment 19098 * 19099 * @hide 19100 */ 19101 @ViewDebug.ExportedProperty(category = "text", mapping = { 19102 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 19103 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 19104 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 19105 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 19106 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 19107 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 19108 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 19109 }) 19110 @TextAlignment 19111 public int getRawTextAlignment() { 19112 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 19113 } 19114 19115 /** 19116 * Set the text alignment. 19117 * 19118 * @param textAlignment The text alignment to set. Should be one of 19119 * 19120 * {@link #TEXT_ALIGNMENT_INHERIT}, 19121 * {@link #TEXT_ALIGNMENT_GRAVITY}, 19122 * {@link #TEXT_ALIGNMENT_CENTER}, 19123 * {@link #TEXT_ALIGNMENT_TEXT_START}, 19124 * {@link #TEXT_ALIGNMENT_TEXT_END}, 19125 * {@link #TEXT_ALIGNMENT_VIEW_START}, 19126 * {@link #TEXT_ALIGNMENT_VIEW_END} 19127 * 19128 * Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution 19129 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 19130 * will return the default {@link #TEXT_ALIGNMENT_GRAVITY}. 19131 * 19132 * @attr ref android.R.styleable#View_textAlignment 19133 */ 19134 public void setTextAlignment(@TextAlignment int textAlignment) { 19135 if (textAlignment != getRawTextAlignment()) { 19136 // Reset the current and resolved text alignment 19137 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 19138 resetResolvedTextAlignment(); 19139 // Set the new text alignment 19140 mPrivateFlags2 |= 19141 ((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK); 19142 // Do resolution 19143 resolveTextAlignment(); 19144 // Notify change 19145 onRtlPropertiesChanged(getLayoutDirection()); 19146 // Refresh 19147 requestLayout(); 19148 invalidate(true); 19149 } 19150 } 19151 19152 /** 19153 * Return the resolved text alignment. 19154 * 19155 * @return the resolved text alignment. Returns one of: 19156 * 19157 * {@link #TEXT_ALIGNMENT_GRAVITY}, 19158 * {@link #TEXT_ALIGNMENT_CENTER}, 19159 * {@link #TEXT_ALIGNMENT_TEXT_START}, 19160 * {@link #TEXT_ALIGNMENT_TEXT_END}, 19161 * {@link #TEXT_ALIGNMENT_VIEW_START}, 19162 * {@link #TEXT_ALIGNMENT_VIEW_END} 19163 * 19164 * @attr ref android.R.styleable#View_textAlignment 19165 */ 19166 @ViewDebug.ExportedProperty(category = "text", mapping = { 19167 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 19168 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 19169 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 19170 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 19171 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 19172 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 19173 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 19174 }) 19175 @TextAlignment 19176 public int getTextAlignment() { 19177 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >> 19178 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 19179 } 19180 19181 /** 19182 * Resolve the text alignment. 19183 * 19184 * @return true if resolution has been done, false otherwise. 19185 * 19186 * @hide 19187 */ 19188 public boolean resolveTextAlignment() { 19189 // Reset any previous text alignment resolution 19190 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 19191 19192 if (hasRtlSupport()) { 19193 // Set resolved text alignment flag depending on text alignment flag 19194 final int textAlignment = getRawTextAlignment(); 19195 switch (textAlignment) { 19196 case TEXT_ALIGNMENT_INHERIT: 19197 // Check if we can resolve the text alignment 19198 if (!canResolveTextAlignment()) { 19199 // We cannot do the resolution if there is no parent so use the default 19200 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 19201 // Resolution will need to happen again later 19202 return false; 19203 } 19204 19205 // Parent has not yet resolved, so we still return the default 19206 try { 19207 if (!mParent.isTextAlignmentResolved()) { 19208 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 19209 // Resolution will need to happen again later 19210 return false; 19211 } 19212 } catch (AbstractMethodError e) { 19213 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 19214 " does not fully implement ViewParent", e); 19215 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED | 19216 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 19217 return true; 19218 } 19219 19220 int parentResolvedTextAlignment; 19221 try { 19222 parentResolvedTextAlignment = mParent.getTextAlignment(); 19223 } catch (AbstractMethodError e) { 19224 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 19225 " does not fully implement ViewParent", e); 19226 parentResolvedTextAlignment = TEXT_ALIGNMENT_GRAVITY; 19227 } 19228 switch (parentResolvedTextAlignment) { 19229 case TEXT_ALIGNMENT_GRAVITY: 19230 case TEXT_ALIGNMENT_TEXT_START: 19231 case TEXT_ALIGNMENT_TEXT_END: 19232 case TEXT_ALIGNMENT_CENTER: 19233 case TEXT_ALIGNMENT_VIEW_START: 19234 case TEXT_ALIGNMENT_VIEW_END: 19235 // Resolved text alignment is the same as the parent resolved 19236 // text alignment 19237 mPrivateFlags2 |= 19238 (parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 19239 break; 19240 default: 19241 // Use default resolved text alignment 19242 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 19243 } 19244 break; 19245 case TEXT_ALIGNMENT_GRAVITY: 19246 case TEXT_ALIGNMENT_TEXT_START: 19247 case TEXT_ALIGNMENT_TEXT_END: 19248 case TEXT_ALIGNMENT_CENTER: 19249 case TEXT_ALIGNMENT_VIEW_START: 19250 case TEXT_ALIGNMENT_VIEW_END: 19251 // Resolved text alignment is the same as text alignment 19252 mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 19253 break; 19254 default: 19255 // Use default resolved text alignment 19256 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 19257 } 19258 } else { 19259 // Use default resolved text alignment 19260 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 19261 } 19262 19263 // Set the resolved 19264 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED; 19265 return true; 19266 } 19267 19268 /** 19269 * Check if text alignment resolution can be done. 19270 * 19271 * @return true if text alignment resolution can be done otherwise return false. 19272 */ 19273 public boolean canResolveTextAlignment() { 19274 switch (getRawTextAlignment()) { 19275 case TEXT_DIRECTION_INHERIT: 19276 if (mParent != null) { 19277 try { 19278 return mParent.canResolveTextAlignment(); 19279 } catch (AbstractMethodError e) { 19280 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 19281 " does not fully implement ViewParent", e); 19282 } 19283 } 19284 return false; 19285 19286 default: 19287 return true; 19288 } 19289 } 19290 19291 /** 19292 * Reset resolved text alignment. Text alignment will be resolved during a call to 19293 * {@link #onMeasure(int, int)}. 19294 * 19295 * @hide 19296 */ 19297 public void resetResolvedTextAlignment() { 19298 // Reset any previous text alignment resolution 19299 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 19300 // Set to default 19301 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 19302 } 19303 19304 /** 19305 * @return true if text alignment is inherited. 19306 * 19307 * @hide 19308 */ 19309 public boolean isTextAlignmentInherited() { 19310 return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT); 19311 } 19312 19313 /** 19314 * @return true if text alignment is resolved. 19315 */ 19316 public boolean isTextAlignmentResolved() { 19317 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED; 19318 } 19319 19320 /** 19321 * Generate a value suitable for use in {@link #setId(int)}. 19322 * This value will not collide with ID values generated at build time by aapt for R.id. 19323 * 19324 * @return a generated ID value 19325 */ 19326 public static int generateViewId() { 19327 for (;;) { 19328 final int result = sNextGeneratedId.get(); 19329 // aapt-generated IDs have the high byte nonzero; clamp to the range under that. 19330 int newValue = result + 1; 19331 if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. 19332 if (sNextGeneratedId.compareAndSet(result, newValue)) { 19333 return result; 19334 } 19335 } 19336 } 19337 19338 /** 19339 * Gets the Views in the hierarchy affected by entering and exiting Activity Scene transitions. 19340 * @param transitioningViews This View will be added to transitioningViews if it is VISIBLE and 19341 * a normal View or a ViewGroup with 19342 * {@link android.view.ViewGroup#isTransitionGroup()} true. 19343 * @hide 19344 */ 19345 public void captureTransitioningViews(List<View> transitioningViews) { 19346 if (getVisibility() == View.VISIBLE) { 19347 transitioningViews.add(this); 19348 } 19349 } 19350 19351 /** 19352 * Adds all Views that have {@link #getTransitionName()} non-null to namedElements. 19353 * @param namedElements Will contain all Views in the hierarchy having a transitionName. 19354 * @hide 19355 */ 19356 public void findNamedViews(Map<String, View> namedElements) { 19357 if (getVisibility() == VISIBLE || mGhostView != null) { 19358 String transitionName = getTransitionName(); 19359 if (transitionName != null) { 19360 namedElements.put(transitionName, this); 19361 } 19362 } 19363 } 19364 19365 // 19366 // Properties 19367 // 19368 /** 19369 * A Property wrapper around the <code>alpha</code> functionality handled by the 19370 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 19371 */ 19372 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 19373 @Override 19374 public void setValue(View object, float value) { 19375 object.setAlpha(value); 19376 } 19377 19378 @Override 19379 public Float get(View object) { 19380 return object.getAlpha(); 19381 } 19382 }; 19383 19384 /** 19385 * A Property wrapper around the <code>translationX</code> functionality handled by the 19386 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 19387 */ 19388 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 19389 @Override 19390 public void setValue(View object, float value) { 19391 object.setTranslationX(value); 19392 } 19393 19394 @Override 19395 public Float get(View object) { 19396 return object.getTranslationX(); 19397 } 19398 }; 19399 19400 /** 19401 * A Property wrapper around the <code>translationY</code> functionality handled by the 19402 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 19403 */ 19404 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 19405 @Override 19406 public void setValue(View object, float value) { 19407 object.setTranslationY(value); 19408 } 19409 19410 @Override 19411 public Float get(View object) { 19412 return object.getTranslationY(); 19413 } 19414 }; 19415 19416 /** 19417 * A Property wrapper around the <code>translationZ</code> functionality handled by the 19418 * {@link View#setTranslationZ(float)} and {@link View#getTranslationZ()} methods. 19419 */ 19420 public static final Property<View, Float> TRANSLATION_Z = new FloatProperty<View>("translationZ") { 19421 @Override 19422 public void setValue(View object, float value) { 19423 object.setTranslationZ(value); 19424 } 19425 19426 @Override 19427 public Float get(View object) { 19428 return object.getTranslationZ(); 19429 } 19430 }; 19431 19432 /** 19433 * A Property wrapper around the <code>x</code> functionality handled by the 19434 * {@link View#setX(float)} and {@link View#getX()} methods. 19435 */ 19436 public static final Property<View, Float> X = new FloatProperty<View>("x") { 19437 @Override 19438 public void setValue(View object, float value) { 19439 object.setX(value); 19440 } 19441 19442 @Override 19443 public Float get(View object) { 19444 return object.getX(); 19445 } 19446 }; 19447 19448 /** 19449 * A Property wrapper around the <code>y</code> functionality handled by the 19450 * {@link View#setY(float)} and {@link View#getY()} methods. 19451 */ 19452 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 19453 @Override 19454 public void setValue(View object, float value) { 19455 object.setY(value); 19456 } 19457 19458 @Override 19459 public Float get(View object) { 19460 return object.getY(); 19461 } 19462 }; 19463 19464 /** 19465 * A Property wrapper around the <code>z</code> functionality handled by the 19466 * {@link View#setZ(float)} and {@link View#getZ()} methods. 19467 */ 19468 public static final Property<View, Float> Z = new FloatProperty<View>("z") { 19469 @Override 19470 public void setValue(View object, float value) { 19471 object.setZ(value); 19472 } 19473 19474 @Override 19475 public Float get(View object) { 19476 return object.getZ(); 19477 } 19478 }; 19479 19480 /** 19481 * A Property wrapper around the <code>rotation</code> functionality handled by the 19482 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 19483 */ 19484 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 19485 @Override 19486 public void setValue(View object, float value) { 19487 object.setRotation(value); 19488 } 19489 19490 @Override 19491 public Float get(View object) { 19492 return object.getRotation(); 19493 } 19494 }; 19495 19496 /** 19497 * A Property wrapper around the <code>rotationX</code> functionality handled by the 19498 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 19499 */ 19500 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 19501 @Override 19502 public void setValue(View object, float value) { 19503 object.setRotationX(value); 19504 } 19505 19506 @Override 19507 public Float get(View object) { 19508 return object.getRotationX(); 19509 } 19510 }; 19511 19512 /** 19513 * A Property wrapper around the <code>rotationY</code> functionality handled by the 19514 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 19515 */ 19516 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 19517 @Override 19518 public void setValue(View object, float value) { 19519 object.setRotationY(value); 19520 } 19521 19522 @Override 19523 public Float get(View object) { 19524 return object.getRotationY(); 19525 } 19526 }; 19527 19528 /** 19529 * A Property wrapper around the <code>scaleX</code> functionality handled by the 19530 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 19531 */ 19532 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 19533 @Override 19534 public void setValue(View object, float value) { 19535 object.setScaleX(value); 19536 } 19537 19538 @Override 19539 public Float get(View object) { 19540 return object.getScaleX(); 19541 } 19542 }; 19543 19544 /** 19545 * A Property wrapper around the <code>scaleY</code> functionality handled by the 19546 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 19547 */ 19548 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 19549 @Override 19550 public void setValue(View object, float value) { 19551 object.setScaleY(value); 19552 } 19553 19554 @Override 19555 public Float get(View object) { 19556 return object.getScaleY(); 19557 } 19558 }; 19559 19560 /** 19561 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 19562 * Each MeasureSpec represents a requirement for either the width or the height. 19563 * A MeasureSpec is comprised of a size and a mode. There are three possible 19564 * modes: 19565 * <dl> 19566 * <dt>UNSPECIFIED</dt> 19567 * <dd> 19568 * The parent has not imposed any constraint on the child. It can be whatever size 19569 * it wants. 19570 * </dd> 19571 * 19572 * <dt>EXACTLY</dt> 19573 * <dd> 19574 * The parent has determined an exact size for the child. The child is going to be 19575 * given those bounds regardless of how big it wants to be. 19576 * </dd> 19577 * 19578 * <dt>AT_MOST</dt> 19579 * <dd> 19580 * The child can be as large as it wants up to the specified size. 19581 * </dd> 19582 * </dl> 19583 * 19584 * MeasureSpecs are implemented as ints to reduce object allocation. This class 19585 * is provided to pack and unpack the <size, mode> tuple into the int. 19586 */ 19587 public static class MeasureSpec { 19588 private static final int MODE_SHIFT = 30; 19589 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 19590 19591 /** 19592 * Measure specification mode: The parent has not imposed any constraint 19593 * on the child. It can be whatever size it wants. 19594 */ 19595 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 19596 19597 /** 19598 * Measure specification mode: The parent has determined an exact size 19599 * for the child. The child is going to be given those bounds regardless 19600 * of how big it wants to be. 19601 */ 19602 public static final int EXACTLY = 1 << MODE_SHIFT; 19603 19604 /** 19605 * Measure specification mode: The child can be as large as it wants up 19606 * to the specified size. 19607 */ 19608 public static final int AT_MOST = 2 << MODE_SHIFT; 19609 19610 /** 19611 * Creates a measure specification based on the supplied size and mode. 19612 * 19613 * The mode must always be one of the following: 19614 * <ul> 19615 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 19616 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 19617 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 19618 * </ul> 19619 * 19620 * <p><strong>Note:</strong> On API level 17 and lower, makeMeasureSpec's 19621 * implementation was such that the order of arguments did not matter 19622 * and overflow in either value could impact the resulting MeasureSpec. 19623 * {@link android.widget.RelativeLayout} was affected by this bug. 19624 * Apps targeting API levels greater than 17 will get the fixed, more strict 19625 * behavior.</p> 19626 * 19627 * @param size the size of the measure specification 19628 * @param mode the mode of the measure specification 19629 * @return the measure specification based on size and mode 19630 */ 19631 public static int makeMeasureSpec(int size, int mode) { 19632 if (sUseBrokenMakeMeasureSpec) { 19633 return size + mode; 19634 } else { 19635 return (size & ~MODE_MASK) | (mode & MODE_MASK); 19636 } 19637 } 19638 19639 /** 19640 * Extracts the mode from the supplied measure specification. 19641 * 19642 * @param measureSpec the measure specification to extract the mode from 19643 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 19644 * {@link android.view.View.MeasureSpec#AT_MOST} or 19645 * {@link android.view.View.MeasureSpec#EXACTLY} 19646 */ 19647 public static int getMode(int measureSpec) { 19648 return (measureSpec & MODE_MASK); 19649 } 19650 19651 /** 19652 * Extracts the size from the supplied measure specification. 19653 * 19654 * @param measureSpec the measure specification to extract the size from 19655 * @return the size in pixels defined in the supplied measure specification 19656 */ 19657 public static int getSize(int measureSpec) { 19658 return (measureSpec & ~MODE_MASK); 19659 } 19660 19661 static int adjust(int measureSpec, int delta) { 19662 final int mode = getMode(measureSpec); 19663 if (mode == UNSPECIFIED) { 19664 // No need to adjust size for UNSPECIFIED mode. 19665 return makeMeasureSpec(0, UNSPECIFIED); 19666 } 19667 int size = getSize(measureSpec) + delta; 19668 if (size < 0) { 19669 Log.e(VIEW_LOG_TAG, "MeasureSpec.adjust: new size would be negative! (" + size + 19670 ") spec: " + toString(measureSpec) + " delta: " + delta); 19671 size = 0; 19672 } 19673 return makeMeasureSpec(size, mode); 19674 } 19675 19676 /** 19677 * Returns a String representation of the specified measure 19678 * specification. 19679 * 19680 * @param measureSpec the measure specification to convert to a String 19681 * @return a String with the following format: "MeasureSpec: MODE SIZE" 19682 */ 19683 public static String toString(int measureSpec) { 19684 int mode = getMode(measureSpec); 19685 int size = getSize(measureSpec); 19686 19687 StringBuilder sb = new StringBuilder("MeasureSpec: "); 19688 19689 if (mode == UNSPECIFIED) 19690 sb.append("UNSPECIFIED "); 19691 else if (mode == EXACTLY) 19692 sb.append("EXACTLY "); 19693 else if (mode == AT_MOST) 19694 sb.append("AT_MOST "); 19695 else 19696 sb.append(mode).append(" "); 19697 19698 sb.append(size); 19699 return sb.toString(); 19700 } 19701 } 19702 19703 private final class CheckForLongPress implements Runnable { 19704 private int mOriginalWindowAttachCount; 19705 19706 @Override 19707 public void run() { 19708 if (isPressed() && (mParent != null) 19709 && mOriginalWindowAttachCount == mWindowAttachCount) { 19710 if (performLongClick()) { 19711 mHasPerformedLongPress = true; 19712 } 19713 } 19714 } 19715 19716 public void rememberWindowAttachCount() { 19717 mOriginalWindowAttachCount = mWindowAttachCount; 19718 } 19719 } 19720 19721 private final class CheckForTap implements Runnable { 19722 public float x; 19723 public float y; 19724 19725 @Override 19726 public void run() { 19727 mPrivateFlags &= ~PFLAG_PREPRESSED; 19728 setPressed(true, x, y); 19729 checkForLongClick(ViewConfiguration.getTapTimeout()); 19730 } 19731 } 19732 19733 private final class PerformClick implements Runnable { 19734 @Override 19735 public void run() { 19736 performClick(); 19737 } 19738 } 19739 19740 /** @hide */ 19741 public void hackTurnOffWindowResizeAnim(boolean off) { 19742 mAttachInfo.mTurnOffWindowResizeAnim = off; 19743 } 19744 19745 /** 19746 * This method returns a ViewPropertyAnimator object, which can be used to animate 19747 * specific properties on this View. 19748 * 19749 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 19750 */ 19751 public ViewPropertyAnimator animate() { 19752 if (mAnimator == null) { 19753 mAnimator = new ViewPropertyAnimator(this); 19754 } 19755 return mAnimator; 19756 } 19757 19758 /** 19759 * Sets the name of the View to be used to identify Views in Transitions. 19760 * Names should be unique in the View hierarchy. 19761 * 19762 * @param transitionName The name of the View to uniquely identify it for Transitions. 19763 */ 19764 public final void setTransitionName(String transitionName) { 19765 mTransitionName = transitionName; 19766 } 19767 19768 /** 19769 * Returns the name of the View to be used to identify Views in Transitions. 19770 * Names should be unique in the View hierarchy. 19771 * 19772 * <p>This returns null if the View has not been given a name.</p> 19773 * 19774 * @return The name used of the View to be used to identify Views in Transitions or null 19775 * if no name has been given. 19776 */ 19777 @ViewDebug.ExportedProperty 19778 public String getTransitionName() { 19779 return mTransitionName; 19780 } 19781 19782 /** 19783 * Interface definition for a callback to be invoked when a hardware key event is 19784 * dispatched to this view. The callback will be invoked before the key event is 19785 * given to the view. This is only useful for hardware keyboards; a software input 19786 * method has no obligation to trigger this listener. 19787 */ 19788 public interface OnKeyListener { 19789 /** 19790 * Called when a hardware key is dispatched to a view. This allows listeners to 19791 * get a chance to respond before the target view. 19792 * <p>Key presses in software keyboards will generally NOT trigger this method, 19793 * although some may elect to do so in some situations. Do not assume a 19794 * software input method has to be key-based; even if it is, it may use key presses 19795 * in a different way than you expect, so there is no way to reliably catch soft 19796 * input key presses. 19797 * 19798 * @param v The view the key has been dispatched to. 19799 * @param keyCode The code for the physical key that was pressed 19800 * @param event The KeyEvent object containing full information about 19801 * the event. 19802 * @return True if the listener has consumed the event, false otherwise. 19803 */ 19804 boolean onKey(View v, int keyCode, KeyEvent event); 19805 } 19806 19807 /** 19808 * Interface definition for a callback to be invoked when a touch event is 19809 * dispatched to this view. The callback will be invoked before the touch 19810 * event is given to the view. 19811 */ 19812 public interface OnTouchListener { 19813 /** 19814 * Called when a touch event is dispatched to a view. This allows listeners to 19815 * get a chance to respond before the target view. 19816 * 19817 * @param v The view the touch event has been dispatched to. 19818 * @param event The MotionEvent object containing full information about 19819 * the event. 19820 * @return True if the listener has consumed the event, false otherwise. 19821 */ 19822 boolean onTouch(View v, MotionEvent event); 19823 } 19824 19825 /** 19826 * Interface definition for a callback to be invoked when a hover event is 19827 * dispatched to this view. The callback will be invoked before the hover 19828 * event is given to the view. 19829 */ 19830 public interface OnHoverListener { 19831 /** 19832 * Called when a hover event is dispatched to a view. This allows listeners to 19833 * get a chance to respond before the target view. 19834 * 19835 * @param v The view the hover event has been dispatched to. 19836 * @param event The MotionEvent object containing full information about 19837 * the event. 19838 * @return True if the listener has consumed the event, false otherwise. 19839 */ 19840 boolean onHover(View v, MotionEvent event); 19841 } 19842 19843 /** 19844 * Interface definition for a callback to be invoked when a generic motion event is 19845 * dispatched to this view. The callback will be invoked before the generic motion 19846 * event is given to the view. 19847 */ 19848 public interface OnGenericMotionListener { 19849 /** 19850 * Called when a generic motion event is dispatched to a view. This allows listeners to 19851 * get a chance to respond before the target view. 19852 * 19853 * @param v The view the generic motion event has been dispatched to. 19854 * @param event The MotionEvent object containing full information about 19855 * the event. 19856 * @return True if the listener has consumed the event, false otherwise. 19857 */ 19858 boolean onGenericMotion(View v, MotionEvent event); 19859 } 19860 19861 /** 19862 * Interface definition for a callback to be invoked when a view has been clicked and held. 19863 */ 19864 public interface OnLongClickListener { 19865 /** 19866 * Called when a view has been clicked and held. 19867 * 19868 * @param v The view that was clicked and held. 19869 * 19870 * @return true if the callback consumed the long click, false otherwise. 19871 */ 19872 boolean onLongClick(View v); 19873 } 19874 19875 /** 19876 * Interface definition for a callback to be invoked when a drag is being dispatched 19877 * to this view. The callback will be invoked before the hosting view's own 19878 * onDrag(event) method. If the listener wants to fall back to the hosting view's 19879 * onDrag(event) behavior, it should return 'false' from this callback. 19880 * 19881 * <div class="special reference"> 19882 * <h3>Developer Guides</h3> 19883 * <p>For a guide to implementing drag and drop features, read the 19884 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 19885 * </div> 19886 */ 19887 public interface OnDragListener { 19888 /** 19889 * Called when a drag event is dispatched to a view. This allows listeners 19890 * to get a chance to override base View behavior. 19891 * 19892 * @param v The View that received the drag event. 19893 * @param event The {@link android.view.DragEvent} object for the drag event. 19894 * @return {@code true} if the drag event was handled successfully, or {@code false} 19895 * if the drag event was not handled. Note that {@code false} will trigger the View 19896 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 19897 */ 19898 boolean onDrag(View v, DragEvent event); 19899 } 19900 19901 /** 19902 * Interface definition for a callback to be invoked when the focus state of 19903 * a view changed. 19904 */ 19905 public interface OnFocusChangeListener { 19906 /** 19907 * Called when the focus state of a view has changed. 19908 * 19909 * @param v The view whose state has changed. 19910 * @param hasFocus The new focus state of v. 19911 */ 19912 void onFocusChange(View v, boolean hasFocus); 19913 } 19914 19915 /** 19916 * Interface definition for a callback to be invoked when a view is clicked. 19917 */ 19918 public interface OnClickListener { 19919 /** 19920 * Called when a view has been clicked. 19921 * 19922 * @param v The view that was clicked. 19923 */ 19924 void onClick(View v); 19925 } 19926 19927 /** 19928 * Interface definition for a callback to be invoked when the context menu 19929 * for this view is being built. 19930 */ 19931 public interface OnCreateContextMenuListener { 19932 /** 19933 * Called when the context menu for this view is being built. It is not 19934 * safe to hold onto the menu after this method returns. 19935 * 19936 * @param menu The context menu that is being built 19937 * @param v The view for which the context menu is being built 19938 * @param menuInfo Extra information about the item for which the 19939 * context menu should be shown. This information will vary 19940 * depending on the class of v. 19941 */ 19942 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 19943 } 19944 19945 /** 19946 * Interface definition for a callback to be invoked when the status bar changes 19947 * visibility. This reports <strong>global</strong> changes to the system UI 19948 * state, not what the application is requesting. 19949 * 19950 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 19951 */ 19952 public interface OnSystemUiVisibilityChangeListener { 19953 /** 19954 * Called when the status bar changes visibility because of a call to 19955 * {@link View#setSystemUiVisibility(int)}. 19956 * 19957 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 19958 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 19959 * This tells you the <strong>global</strong> state of these UI visibility 19960 * flags, not what your app is currently applying. 19961 */ 19962 public void onSystemUiVisibilityChange(int visibility); 19963 } 19964 19965 /** 19966 * Interface definition for a callback to be invoked when this view is attached 19967 * or detached from its window. 19968 */ 19969 public interface OnAttachStateChangeListener { 19970 /** 19971 * Called when the view is attached to a window. 19972 * @param v The view that was attached 19973 */ 19974 public void onViewAttachedToWindow(View v); 19975 /** 19976 * Called when the view is detached from a window. 19977 * @param v The view that was detached 19978 */ 19979 public void onViewDetachedFromWindow(View v); 19980 } 19981 19982 /** 19983 * Listener for applying window insets on a view in a custom way. 19984 * 19985 * <p>Apps may choose to implement this interface if they want to apply custom policy 19986 * to the way that window insets are treated for a view. If an OnApplyWindowInsetsListener 19987 * is set, its 19988 * {@link OnApplyWindowInsetsListener#onApplyWindowInsets(View, WindowInsets) onApplyWindowInsets} 19989 * method will be called instead of the View's own 19990 * {@link #onApplyWindowInsets(WindowInsets) onApplyWindowInsets} method. The listener 19991 * may optionally call the parameter View's <code>onApplyWindowInsets</code> method to apply 19992 * the View's normal behavior as part of its own.</p> 19993 */ 19994 public interface OnApplyWindowInsetsListener { 19995 /** 19996 * When {@link View#setOnApplyWindowInsetsListener(View.OnApplyWindowInsetsListener) set} 19997 * on a View, this listener method will be called instead of the view's own 19998 * {@link View#onApplyWindowInsets(WindowInsets) onApplyWindowInsets} method. 19999 * 20000 * @param v The view applying window insets 20001 * @param insets The insets to apply 20002 * @return The insets supplied, minus any insets that were consumed 20003 */ 20004 public WindowInsets onApplyWindowInsets(View v, WindowInsets insets); 20005 } 20006 20007 private final class UnsetPressedState implements Runnable { 20008 @Override 20009 public void run() { 20010 setPressed(false); 20011 } 20012 } 20013 20014 /** 20015 * Base class for derived classes that want to save and restore their own 20016 * state in {@link android.view.View#onSaveInstanceState()}. 20017 */ 20018 public static class BaseSavedState extends AbsSavedState { 20019 /** 20020 * Constructor used when reading from a parcel. Reads the state of the superclass. 20021 * 20022 * @param source 20023 */ 20024 public BaseSavedState(Parcel source) { 20025 super(source); 20026 } 20027 20028 /** 20029 * Constructor called by derived classes when creating their SavedState objects 20030 * 20031 * @param superState The state of the superclass of this view 20032 */ 20033 public BaseSavedState(Parcelable superState) { 20034 super(superState); 20035 } 20036 20037 public static final Parcelable.Creator<BaseSavedState> CREATOR = 20038 new Parcelable.Creator<BaseSavedState>() { 20039 public BaseSavedState createFromParcel(Parcel in) { 20040 return new BaseSavedState(in); 20041 } 20042 20043 public BaseSavedState[] newArray(int size) { 20044 return new BaseSavedState[size]; 20045 } 20046 }; 20047 } 20048 20049 /** 20050 * A set of information given to a view when it is attached to its parent 20051 * window. 20052 */ 20053 final static class AttachInfo { 20054 interface Callbacks { 20055 void playSoundEffect(int effectId); 20056 boolean performHapticFeedback(int effectId, boolean always); 20057 } 20058 20059 /** 20060 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 20061 * to a Handler. This class contains the target (View) to invalidate and 20062 * the coordinates of the dirty rectangle. 20063 * 20064 * For performance purposes, this class also implements a pool of up to 20065 * POOL_LIMIT objects that get reused. This reduces memory allocations 20066 * whenever possible. 20067 */ 20068 static class InvalidateInfo { 20069 private static final int POOL_LIMIT = 10; 20070 20071 private static final SynchronizedPool<InvalidateInfo> sPool = 20072 new SynchronizedPool<InvalidateInfo>(POOL_LIMIT); 20073 20074 View target; 20075 20076 int left; 20077 int top; 20078 int right; 20079 int bottom; 20080 20081 public static InvalidateInfo obtain() { 20082 InvalidateInfo instance = sPool.acquire(); 20083 return (instance != null) ? instance : new InvalidateInfo(); 20084 } 20085 20086 public void recycle() { 20087 target = null; 20088 sPool.release(this); 20089 } 20090 } 20091 20092 final IWindowSession mSession; 20093 20094 final IWindow mWindow; 20095 20096 final IBinder mWindowToken; 20097 20098 final Display mDisplay; 20099 20100 final Callbacks mRootCallbacks; 20101 20102 IWindowId mIWindowId; 20103 WindowId mWindowId; 20104 20105 /** 20106 * The top view of the hierarchy. 20107 */ 20108 View mRootView; 20109 20110 IBinder mPanelParentWindowToken; 20111 20112 boolean mHardwareAccelerated; 20113 boolean mHardwareAccelerationRequested; 20114 HardwareRenderer mHardwareRenderer; 20115 List<RenderNode> mPendingAnimatingRenderNodes; 20116 20117 /** 20118 * The state of the display to which the window is attached, as reported 20119 * by {@link Display#getState()}. Note that the display state constants 20120 * declared by {@link Display} do not exactly line up with the screen state 20121 * constants declared by {@link View} (there are more display states than 20122 * screen states). 20123 */ 20124 int mDisplayState = Display.STATE_UNKNOWN; 20125 20126 /** 20127 * Scale factor used by the compatibility mode 20128 */ 20129 float mApplicationScale; 20130 20131 /** 20132 * Indicates whether the application is in compatibility mode 20133 */ 20134 boolean mScalingRequired; 20135 20136 /** 20137 * If set, ViewRootImpl doesn't use its lame animation for when the window resizes. 20138 */ 20139 boolean mTurnOffWindowResizeAnim; 20140 20141 /** 20142 * Left position of this view's window 20143 */ 20144 int mWindowLeft; 20145 20146 /** 20147 * Top position of this view's window 20148 */ 20149 int mWindowTop; 20150 20151 /** 20152 * Indicates whether views need to use 32-bit drawing caches 20153 */ 20154 boolean mUse32BitDrawingCache; 20155 20156 /** 20157 * For windows that are full-screen but using insets to layout inside 20158 * of the screen areas, these are the current insets to appear inside 20159 * the overscan area of the display. 20160 */ 20161 final Rect mOverscanInsets = new Rect(); 20162 20163 /** 20164 * For windows that are full-screen but using insets to layout inside 20165 * of the screen decorations, these are the current insets for the 20166 * content of the window. 20167 */ 20168 final Rect mContentInsets = new Rect(); 20169 20170 /** 20171 * For windows that are full-screen but using insets to layout inside 20172 * of the screen decorations, these are the current insets for the 20173 * actual visible parts of the window. 20174 */ 20175 final Rect mVisibleInsets = new Rect(); 20176 20177 /** 20178 * For windows that are full-screen but using insets to layout inside 20179 * of the screen decorations, these are the current insets for the 20180 * stable system windows. 20181 */ 20182 final Rect mStableInsets = new Rect(); 20183 20184 /** 20185 * The internal insets given by this window. This value is 20186 * supplied by the client (through 20187 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 20188 * be given to the window manager when changed to be used in laying 20189 * out windows behind it. 20190 */ 20191 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 20192 = new ViewTreeObserver.InternalInsetsInfo(); 20193 20194 /** 20195 * Set to true when mGivenInternalInsets is non-empty. 20196 */ 20197 boolean mHasNonEmptyGivenInternalInsets; 20198 20199 /** 20200 * All views in the window's hierarchy that serve as scroll containers, 20201 * used to determine if the window can be resized or must be panned 20202 * to adjust for a soft input area. 20203 */ 20204 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 20205 20206 final KeyEvent.DispatcherState mKeyDispatchState 20207 = new KeyEvent.DispatcherState(); 20208 20209 /** 20210 * Indicates whether the view's window currently has the focus. 20211 */ 20212 boolean mHasWindowFocus; 20213 20214 /** 20215 * The current visibility of the window. 20216 */ 20217 int mWindowVisibility; 20218 20219 /** 20220 * Indicates the time at which drawing started to occur. 20221 */ 20222 long mDrawingTime; 20223 20224 /** 20225 * Indicates whether or not ignoring the DIRTY_MASK flags. 20226 */ 20227 boolean mIgnoreDirtyState; 20228 20229 /** 20230 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 20231 * to avoid clearing that flag prematurely. 20232 */ 20233 boolean mSetIgnoreDirtyState = false; 20234 20235 /** 20236 * Indicates whether the view's window is currently in touch mode. 20237 */ 20238 boolean mInTouchMode; 20239 20240 /** 20241 * Indicates whether the view has requested unbuffered input dispatching for the current 20242 * event stream. 20243 */ 20244 boolean mUnbufferedDispatchRequested; 20245 20246 /** 20247 * Indicates that ViewAncestor should trigger a global layout change 20248 * the next time it performs a traversal 20249 */ 20250 boolean mRecomputeGlobalAttributes; 20251 20252 /** 20253 * Always report new attributes at next traversal. 20254 */ 20255 boolean mForceReportNewAttributes; 20256 20257 /** 20258 * Set during a traveral if any views want to keep the screen on. 20259 */ 20260 boolean mKeepScreenOn; 20261 20262 /** 20263 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 20264 */ 20265 int mSystemUiVisibility; 20266 20267 /** 20268 * Hack to force certain system UI visibility flags to be cleared. 20269 */ 20270 int mDisabledSystemUiVisibility; 20271 20272 /** 20273 * Last global system UI visibility reported by the window manager. 20274 */ 20275 int mGlobalSystemUiVisibility; 20276 20277 /** 20278 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 20279 * attached. 20280 */ 20281 boolean mHasSystemUiListeners; 20282 20283 /** 20284 * Set if the window has requested to extend into the overscan region 20285 * via WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN. 20286 */ 20287 boolean mOverscanRequested; 20288 20289 /** 20290 * Set if the visibility of any views has changed. 20291 */ 20292 boolean mViewVisibilityChanged; 20293 20294 /** 20295 * Set to true if a view has been scrolled. 20296 */ 20297 boolean mViewScrollChanged; 20298 20299 /** 20300 * Set to true if high contrast mode enabled 20301 */ 20302 boolean mHighContrastText; 20303 20304 /** 20305 * Global to the view hierarchy used as a temporary for dealing with 20306 * x/y points in the transparent region computations. 20307 */ 20308 final int[] mTransparentLocation = new int[2]; 20309 20310 /** 20311 * Global to the view hierarchy used as a temporary for dealing with 20312 * x/y points in the ViewGroup.invalidateChild implementation. 20313 */ 20314 final int[] mInvalidateChildLocation = new int[2]; 20315 20316 /** 20317 * Global to the view hierarchy used as a temporary for dealng with 20318 * computing absolute on-screen location. 20319 */ 20320 final int[] mTmpLocation = new int[2]; 20321 20322 /** 20323 * Global to the view hierarchy used as a temporary for dealing with 20324 * x/y location when view is transformed. 20325 */ 20326 final float[] mTmpTransformLocation = new float[2]; 20327 20328 /** 20329 * The view tree observer used to dispatch global events like 20330 * layout, pre-draw, touch mode change, etc. 20331 */ 20332 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 20333 20334 /** 20335 * A Canvas used by the view hierarchy to perform bitmap caching. 20336 */ 20337 Canvas mCanvas; 20338 20339 /** 20340 * The view root impl. 20341 */ 20342 final ViewRootImpl mViewRootImpl; 20343 20344 /** 20345 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 20346 * handler can be used to pump events in the UI events queue. 20347 */ 20348 final Handler mHandler; 20349 20350 /** 20351 * Temporary for use in computing invalidate rectangles while 20352 * calling up the hierarchy. 20353 */ 20354 final Rect mTmpInvalRect = new Rect(); 20355 20356 /** 20357 * Temporary for use in computing hit areas with transformed views 20358 */ 20359 final RectF mTmpTransformRect = new RectF(); 20360 20361 /** 20362 * Temporary for use in computing hit areas with transformed views 20363 */ 20364 final RectF mTmpTransformRect1 = new RectF(); 20365 20366 /** 20367 * Temporary list of rectanges. 20368 */ 20369 final List<RectF> mTmpRectList = new ArrayList<>(); 20370 20371 /** 20372 * Temporary for use in transforming invalidation rect 20373 */ 20374 final Matrix mTmpMatrix = new Matrix(); 20375 20376 /** 20377 * Temporary for use in transforming invalidation rect 20378 */ 20379 final Transformation mTmpTransformation = new Transformation(); 20380 20381 /** 20382 * Temporary for use in querying outlines from OutlineProviders 20383 */ 20384 final Outline mTmpOutline = new Outline(); 20385 20386 /** 20387 * Temporary list for use in collecting focusable descendents of a view. 20388 */ 20389 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 20390 20391 /** 20392 * The id of the window for accessibility purposes. 20393 */ 20394 int mAccessibilityWindowId = AccessibilityNodeInfo.UNDEFINED_ITEM_ID; 20395 20396 /** 20397 * Flags related to accessibility processing. 20398 * 20399 * @see AccessibilityNodeInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS 20400 * @see AccessibilityNodeInfo#FLAG_REPORT_VIEW_IDS 20401 */ 20402 int mAccessibilityFetchFlags; 20403 20404 /** 20405 * The drawable for highlighting accessibility focus. 20406 */ 20407 Drawable mAccessibilityFocusDrawable; 20408 20409 /** 20410 * Show where the margins, bounds and layout bounds are for each view. 20411 */ 20412 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 20413 20414 /** 20415 * Point used to compute visible regions. 20416 */ 20417 final Point mPoint = new Point(); 20418 20419 /** 20420 * Used to track which View originated a requestLayout() call, used when 20421 * requestLayout() is called during layout. 20422 */ 20423 View mViewRequestingLayout; 20424 20425 /** 20426 * Creates a new set of attachment information with the specified 20427 * events handler and thread. 20428 * 20429 * @param handler the events handler the view must use 20430 */ 20431 AttachInfo(IWindowSession session, IWindow window, Display display, 20432 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 20433 mSession = session; 20434 mWindow = window; 20435 mWindowToken = window.asBinder(); 20436 mDisplay = display; 20437 mViewRootImpl = viewRootImpl; 20438 mHandler = handler; 20439 mRootCallbacks = effectPlayer; 20440 } 20441 } 20442 20443 /** 20444 * <p>ScrollabilityCache holds various fields used by a View when scrolling 20445 * is supported. This avoids keeping too many unused fields in most 20446 * instances of View.</p> 20447 */ 20448 private static class ScrollabilityCache implements Runnable { 20449 20450 /** 20451 * Scrollbars are not visible 20452 */ 20453 public static final int OFF = 0; 20454 20455 /** 20456 * Scrollbars are visible 20457 */ 20458 public static final int ON = 1; 20459 20460 /** 20461 * Scrollbars are fading away 20462 */ 20463 public static final int FADING = 2; 20464 20465 public boolean fadeScrollBars; 20466 20467 public int fadingEdgeLength; 20468 public int scrollBarDefaultDelayBeforeFade; 20469 public int scrollBarFadeDuration; 20470 20471 public int scrollBarSize; 20472 public ScrollBarDrawable scrollBar; 20473 public float[] interpolatorValues; 20474 public View host; 20475 20476 public final Paint paint; 20477 public final Matrix matrix; 20478 public Shader shader; 20479 20480 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 20481 20482 private static final float[] OPAQUE = { 255 }; 20483 private static final float[] TRANSPARENT = { 0.0f }; 20484 20485 /** 20486 * When fading should start. This time moves into the future every time 20487 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 20488 */ 20489 public long fadeStartTime; 20490 20491 20492 /** 20493 * The current state of the scrollbars: ON, OFF, or FADING 20494 */ 20495 public int state = OFF; 20496 20497 private int mLastColor; 20498 20499 public ScrollabilityCache(ViewConfiguration configuration, View host) { 20500 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 20501 scrollBarSize = configuration.getScaledScrollBarSize(); 20502 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 20503 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 20504 20505 paint = new Paint(); 20506 matrix = new Matrix(); 20507 // use use a height of 1, and then wack the matrix each time we 20508 // actually use it. 20509 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 20510 paint.setShader(shader); 20511 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 20512 20513 this.host = host; 20514 } 20515 20516 public void setFadeColor(int color) { 20517 if (color != mLastColor) { 20518 mLastColor = color; 20519 20520 if (color != 0) { 20521 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 20522 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 20523 paint.setShader(shader); 20524 // Restore the default transfer mode (src_over) 20525 paint.setXfermode(null); 20526 } else { 20527 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 20528 paint.setShader(shader); 20529 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 20530 } 20531 } 20532 } 20533 20534 public void run() { 20535 long now = AnimationUtils.currentAnimationTimeMillis(); 20536 if (now >= fadeStartTime) { 20537 20538 // the animation fades the scrollbars out by changing 20539 // the opacity (alpha) from fully opaque to fully 20540 // transparent 20541 int nextFrame = (int) now; 20542 int framesCount = 0; 20543 20544 Interpolator interpolator = scrollBarInterpolator; 20545 20546 // Start opaque 20547 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 20548 20549 // End transparent 20550 nextFrame += scrollBarFadeDuration; 20551 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 20552 20553 state = FADING; 20554 20555 // Kick off the fade animation 20556 host.invalidate(true); 20557 } 20558 } 20559 } 20560 20561 /** 20562 * Resuable callback for sending 20563 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 20564 */ 20565 private class SendViewScrolledAccessibilityEvent implements Runnable { 20566 public volatile boolean mIsPending; 20567 20568 public void run() { 20569 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 20570 mIsPending = false; 20571 } 20572 } 20573 20574 /** 20575 * <p> 20576 * This class represents a delegate that can be registered in a {@link View} 20577 * to enhance accessibility support via composition rather via inheritance. 20578 * It is specifically targeted to widget developers that extend basic View 20579 * classes i.e. classes in package android.view, that would like their 20580 * applications to be backwards compatible. 20581 * </p> 20582 * <div class="special reference"> 20583 * <h3>Developer Guides</h3> 20584 * <p>For more information about making applications accessible, read the 20585 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 20586 * developer guide.</p> 20587 * </div> 20588 * <p> 20589 * A scenario in which a developer would like to use an accessibility delegate 20590 * is overriding a method introduced in a later API version then the minimal API 20591 * version supported by the application. For example, the method 20592 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 20593 * in API version 4 when the accessibility APIs were first introduced. If a 20594 * developer would like his application to run on API version 4 devices (assuming 20595 * all other APIs used by the application are version 4 or lower) and take advantage 20596 * of this method, instead of overriding the method which would break the application's 20597 * backwards compatibility, he can override the corresponding method in this 20598 * delegate and register the delegate in the target View if the API version of 20599 * the system is high enough i.e. the API version is same or higher to the API 20600 * version that introduced 20601 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 20602 * </p> 20603 * <p> 20604 * Here is an example implementation: 20605 * </p> 20606 * <code><pre><p> 20607 * if (Build.VERSION.SDK_INT >= 14) { 20608 * // If the API version is equal of higher than the version in 20609 * // which onInitializeAccessibilityNodeInfo was introduced we 20610 * // register a delegate with a customized implementation. 20611 * View view = findViewById(R.id.view_id); 20612 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 20613 * public void onInitializeAccessibilityNodeInfo(View host, 20614 * AccessibilityNodeInfo info) { 20615 * // Let the default implementation populate the info. 20616 * super.onInitializeAccessibilityNodeInfo(host, info); 20617 * // Set some other information. 20618 * info.setEnabled(host.isEnabled()); 20619 * } 20620 * }); 20621 * } 20622 * </code></pre></p> 20623 * <p> 20624 * This delegate contains methods that correspond to the accessibility methods 20625 * in View. If a delegate has been specified the implementation in View hands 20626 * off handling to the corresponding method in this delegate. The default 20627 * implementation the delegate methods behaves exactly as the corresponding 20628 * method in View for the case of no accessibility delegate been set. Hence, 20629 * to customize the behavior of a View method, clients can override only the 20630 * corresponding delegate method without altering the behavior of the rest 20631 * accessibility related methods of the host view. 20632 * </p> 20633 */ 20634 public static class AccessibilityDelegate { 20635 20636 /** 20637 * Sends an accessibility event of the given type. If accessibility is not 20638 * enabled this method has no effect. 20639 * <p> 20640 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 20641 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 20642 * been set. 20643 * </p> 20644 * 20645 * @param host The View hosting the delegate. 20646 * @param eventType The type of the event to send. 20647 * 20648 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 20649 */ 20650 public void sendAccessibilityEvent(View host, int eventType) { 20651 host.sendAccessibilityEventInternal(eventType); 20652 } 20653 20654 /** 20655 * Performs the specified accessibility action on the view. For 20656 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 20657 * <p> 20658 * The default implementation behaves as 20659 * {@link View#performAccessibilityAction(int, Bundle) 20660 * View#performAccessibilityAction(int, Bundle)} for the case of 20661 * no accessibility delegate been set. 20662 * </p> 20663 * 20664 * @param action The action to perform. 20665 * @return Whether the action was performed. 20666 * 20667 * @see View#performAccessibilityAction(int, Bundle) 20668 * View#performAccessibilityAction(int, Bundle) 20669 */ 20670 public boolean performAccessibilityAction(View host, int action, Bundle args) { 20671 return host.performAccessibilityActionInternal(action, args); 20672 } 20673 20674 /** 20675 * Sends an accessibility event. This method behaves exactly as 20676 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 20677 * empty {@link AccessibilityEvent} and does not perform a check whether 20678 * accessibility is enabled. 20679 * <p> 20680 * The default implementation behaves as 20681 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 20682 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 20683 * the case of no accessibility delegate been set. 20684 * </p> 20685 * 20686 * @param host The View hosting the delegate. 20687 * @param event The event to send. 20688 * 20689 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 20690 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 20691 */ 20692 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 20693 host.sendAccessibilityEventUncheckedInternal(event); 20694 } 20695 20696 /** 20697 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 20698 * to its children for adding their text content to the event. 20699 * <p> 20700 * The default implementation behaves as 20701 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 20702 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 20703 * the case of no accessibility delegate been set. 20704 * </p> 20705 * 20706 * @param host The View hosting the delegate. 20707 * @param event The event. 20708 * @return True if the event population was completed. 20709 * 20710 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 20711 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 20712 */ 20713 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 20714 return host.dispatchPopulateAccessibilityEventInternal(event); 20715 } 20716 20717 /** 20718 * Gives a chance to the host View to populate the accessibility event with its 20719 * text content. 20720 * <p> 20721 * The default implementation behaves as 20722 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 20723 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 20724 * the case of no accessibility delegate been set. 20725 * </p> 20726 * 20727 * @param host The View hosting the delegate. 20728 * @param event The accessibility event which to populate. 20729 * 20730 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 20731 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 20732 */ 20733 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 20734 host.onPopulateAccessibilityEventInternal(event); 20735 } 20736 20737 /** 20738 * Initializes an {@link AccessibilityEvent} with information about the 20739 * the host View which is the event source. 20740 * <p> 20741 * The default implementation behaves as 20742 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 20743 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 20744 * the case of no accessibility delegate been set. 20745 * </p> 20746 * 20747 * @param host The View hosting the delegate. 20748 * @param event The event to initialize. 20749 * 20750 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 20751 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 20752 */ 20753 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 20754 host.onInitializeAccessibilityEventInternal(event); 20755 } 20756 20757 /** 20758 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 20759 * <p> 20760 * The default implementation behaves as 20761 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 20762 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 20763 * the case of no accessibility delegate been set. 20764 * </p> 20765 * 20766 * @param host The View hosting the delegate. 20767 * @param info The instance to initialize. 20768 * 20769 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 20770 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 20771 */ 20772 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 20773 host.onInitializeAccessibilityNodeInfoInternal(info); 20774 } 20775 20776 /** 20777 * Called when a child of the host View has requested sending an 20778 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 20779 * to augment the event. 20780 * <p> 20781 * The default implementation behaves as 20782 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 20783 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 20784 * the case of no accessibility delegate been set. 20785 * </p> 20786 * 20787 * @param host The View hosting the delegate. 20788 * @param child The child which requests sending the event. 20789 * @param event The event to be sent. 20790 * @return True if the event should be sent 20791 * 20792 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 20793 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 20794 */ 20795 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 20796 AccessibilityEvent event) { 20797 return host.onRequestSendAccessibilityEventInternal(child, event); 20798 } 20799 20800 /** 20801 * Gets the provider for managing a virtual view hierarchy rooted at this View 20802 * and reported to {@link android.accessibilityservice.AccessibilityService}s 20803 * that explore the window content. 20804 * <p> 20805 * The default implementation behaves as 20806 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 20807 * the case of no accessibility delegate been set. 20808 * </p> 20809 * 20810 * @return The provider. 20811 * 20812 * @see AccessibilityNodeProvider 20813 */ 20814 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 20815 return null; 20816 } 20817 20818 /** 20819 * Returns an {@link AccessibilityNodeInfo} representing the host view from the 20820 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 20821 * This method is responsible for obtaining an accessibility node info from a 20822 * pool of reusable instances and calling 20823 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on the host 20824 * view to initialize the former. 20825 * <p> 20826 * <strong>Note:</strong> The client is responsible for recycling the obtained 20827 * instance by calling {@link AccessibilityNodeInfo#recycle()} to minimize object 20828 * creation. 20829 * </p> 20830 * <p> 20831 * The default implementation behaves as 20832 * {@link View#createAccessibilityNodeInfo() View#createAccessibilityNodeInfo()} for 20833 * the case of no accessibility delegate been set. 20834 * </p> 20835 * @return A populated {@link AccessibilityNodeInfo}. 20836 * 20837 * @see AccessibilityNodeInfo 20838 * 20839 * @hide 20840 */ 20841 public AccessibilityNodeInfo createAccessibilityNodeInfo(View host) { 20842 return host.createAccessibilityNodeInfoInternal(); 20843 } 20844 } 20845 20846 private class MatchIdPredicate implements Predicate<View> { 20847 public int mId; 20848 20849 @Override 20850 public boolean apply(View view) { 20851 return (view.mID == mId); 20852 } 20853 } 20854 20855 private class MatchLabelForPredicate implements Predicate<View> { 20856 private int mLabeledId; 20857 20858 @Override 20859 public boolean apply(View view) { 20860 return (view.mLabelForId == mLabeledId); 20861 } 20862 } 20863 20864 private class SendViewStateChangedAccessibilityEvent implements Runnable { 20865 private int mChangeTypes = 0; 20866 private boolean mPosted; 20867 private boolean mPostedWithDelay; 20868 private long mLastEventTimeMillis; 20869 20870 @Override 20871 public void run() { 20872 mPosted = false; 20873 mPostedWithDelay = false; 20874 mLastEventTimeMillis = SystemClock.uptimeMillis(); 20875 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 20876 final AccessibilityEvent event = AccessibilityEvent.obtain(); 20877 event.setEventType(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED); 20878 event.setContentChangeTypes(mChangeTypes); 20879 sendAccessibilityEventUnchecked(event); 20880 } 20881 mChangeTypes = 0; 20882 } 20883 20884 public void runOrPost(int changeType) { 20885 mChangeTypes |= changeType; 20886 20887 // If this is a live region or the child of a live region, collect 20888 // all events from this frame and send them on the next frame. 20889 if (inLiveRegion()) { 20890 // If we're already posted with a delay, remove that. 20891 if (mPostedWithDelay) { 20892 removeCallbacks(this); 20893 mPostedWithDelay = false; 20894 } 20895 // Only post if we're not already posted. 20896 if (!mPosted) { 20897 post(this); 20898 mPosted = true; 20899 } 20900 return; 20901 } 20902 20903 if (mPosted) { 20904 return; 20905 } 20906 20907 final long timeSinceLastMillis = SystemClock.uptimeMillis() - mLastEventTimeMillis; 20908 final long minEventIntevalMillis = 20909 ViewConfiguration.getSendRecurringAccessibilityEventsInterval(); 20910 if (timeSinceLastMillis >= minEventIntevalMillis) { 20911 removeCallbacks(this); 20912 run(); 20913 } else { 20914 postDelayed(this, minEventIntevalMillis - timeSinceLastMillis); 20915 mPostedWithDelay = true; 20916 } 20917 } 20918 } 20919 20920 private boolean inLiveRegion() { 20921 if (getAccessibilityLiveRegion() != View.ACCESSIBILITY_LIVE_REGION_NONE) { 20922 return true; 20923 } 20924 20925 ViewParent parent = getParent(); 20926 while (parent instanceof View) { 20927 if (((View) parent).getAccessibilityLiveRegion() 20928 != View.ACCESSIBILITY_LIVE_REGION_NONE) { 20929 return true; 20930 } 20931 parent = parent.getParent(); 20932 } 20933 20934 return false; 20935 } 20936 20937 /** 20938 * Dump all private flags in readable format, useful for documentation and 20939 * sanity checking. 20940 */ 20941 private static void dumpFlags() { 20942 final HashMap<String, String> found = Maps.newHashMap(); 20943 try { 20944 for (Field field : View.class.getDeclaredFields()) { 20945 final int modifiers = field.getModifiers(); 20946 if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) { 20947 if (field.getType().equals(int.class)) { 20948 final int value = field.getInt(null); 20949 dumpFlag(found, field.getName(), value); 20950 } else if (field.getType().equals(int[].class)) { 20951 final int[] values = (int[]) field.get(null); 20952 for (int i = 0; i < values.length; i++) { 20953 dumpFlag(found, field.getName() + "[" + i + "]", values[i]); 20954 } 20955 } 20956 } 20957 } 20958 } catch (IllegalAccessException e) { 20959 throw new RuntimeException(e); 20960 } 20961 20962 final ArrayList<String> keys = Lists.newArrayList(); 20963 keys.addAll(found.keySet()); 20964 Collections.sort(keys); 20965 for (String key : keys) { 20966 Log.d(VIEW_LOG_TAG, found.get(key)); 20967 } 20968 } 20969 20970 private static void dumpFlag(HashMap<String, String> found, String name, int value) { 20971 // Sort flags by prefix, then by bits, always keeping unique keys 20972 final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' '); 20973 final int prefix = name.indexOf('_'); 20974 final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name; 20975 final String output = bits + " " + name; 20976 found.put(key, output); 20977 } 20978} 20979