View.java revision 641bac8e21673a2d526b9c0ccf28d5fd08bd6994
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.content.ClipData; 20import android.content.Context; 21import android.content.pm.ApplicationInfo; 22import android.content.res.Configuration; 23import android.content.res.Resources; 24import android.content.res.TypedArray; 25import android.graphics.Bitmap; 26import android.graphics.Camera; 27import android.graphics.Canvas; 28import android.graphics.Insets; 29import android.graphics.Interpolator; 30import android.graphics.LinearGradient; 31import android.graphics.Matrix; 32import android.graphics.Paint; 33import android.graphics.PixelFormat; 34import android.graphics.Point; 35import android.graphics.PorterDuff; 36import android.graphics.PorterDuffXfermode; 37import android.graphics.Rect; 38import android.graphics.RectF; 39import android.graphics.Region; 40import android.graphics.Shader; 41import android.graphics.drawable.ColorDrawable; 42import android.graphics.drawable.Drawable; 43import android.hardware.display.DisplayManagerGlobal; 44import android.os.Bundle; 45import android.os.Handler; 46import android.os.IBinder; 47import android.os.Parcel; 48import android.os.Parcelable; 49import android.os.RemoteException; 50import android.os.SystemClock; 51import android.os.SystemProperties; 52import android.text.TextUtils; 53import android.util.AttributeSet; 54import android.util.FloatProperty; 55import android.util.LayoutDirection; 56import android.util.Log; 57import android.util.LongSparseLongArray; 58import android.util.Pools.SynchronizedPool; 59import android.util.Property; 60import android.util.SparseArray; 61import android.util.SuperNotCalledException; 62import android.util.TypedValue; 63import android.view.ContextMenu.ContextMenuInfo; 64import android.view.AccessibilityIterators.TextSegmentIterator; 65import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 66import android.view.AccessibilityIterators.WordTextSegmentIterator; 67import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 68import android.view.accessibility.AccessibilityEvent; 69import android.view.accessibility.AccessibilityEventSource; 70import android.view.accessibility.AccessibilityManager; 71import android.view.accessibility.AccessibilityNodeInfo; 72import android.view.accessibility.AccessibilityNodeProvider; 73import android.view.animation.Animation; 74import android.view.animation.AnimationUtils; 75import android.view.animation.Transformation; 76import android.view.inputmethod.EditorInfo; 77import android.view.inputmethod.InputConnection; 78import android.view.inputmethod.InputMethodManager; 79import android.widget.ScrollBarDrawable; 80 81import static android.os.Build.VERSION_CODES.*; 82import static java.lang.Math.max; 83 84import com.android.internal.R; 85import com.android.internal.util.Predicate; 86import com.android.internal.view.menu.MenuBuilder; 87import com.google.android.collect.Lists; 88import com.google.android.collect.Maps; 89 90import java.lang.ref.WeakReference; 91import java.lang.reflect.Field; 92import java.lang.reflect.InvocationTargetException; 93import java.lang.reflect.Method; 94import java.lang.reflect.Modifier; 95import java.util.ArrayList; 96import java.util.Arrays; 97import java.util.Collections; 98import java.util.HashMap; 99import java.util.Locale; 100import java.util.concurrent.CopyOnWriteArrayList; 101import java.util.concurrent.atomic.AtomicInteger; 102 103/** 104 * <p> 105 * This class represents the basic building block for user interface components. A View 106 * occupies a rectangular area on the screen and is responsible for drawing and 107 * event handling. View is the base class for <em>widgets</em>, which are 108 * used to create interactive UI components (buttons, text fields, etc.). The 109 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 110 * are invisible containers that hold other Views (or other ViewGroups) and define 111 * their layout properties. 112 * </p> 113 * 114 * <div class="special reference"> 115 * <h3>Developer Guides</h3> 116 * <p>For information about using this class to develop your application's user interface, 117 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 118 * </div> 119 * 120 * <a name="Using"></a> 121 * <h3>Using Views</h3> 122 * <p> 123 * All of the views in a window are arranged in a single tree. You can add views 124 * either from code or by specifying a tree of views in one or more XML layout 125 * files. There are many specialized subclasses of views that act as controls or 126 * are capable of displaying text, images, or other content. 127 * </p> 128 * <p> 129 * Once you have created a tree of views, there are typically a few types of 130 * common operations you may wish to perform: 131 * <ul> 132 * <li><strong>Set properties:</strong> for example setting the text of a 133 * {@link android.widget.TextView}. The available properties and the methods 134 * that set them will vary among the different subclasses of views. Note that 135 * properties that are known at build time can be set in the XML layout 136 * files.</li> 137 * <li><strong>Set focus:</strong> The framework will handled moving focus in 138 * response to user input. To force focus to a specific view, call 139 * {@link #requestFocus}.</li> 140 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 141 * that will be notified when something interesting happens to the view. For 142 * example, all views will let you set a listener to be notified when the view 143 * gains or loses focus. You can register such a listener using 144 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 145 * Other view subclasses offer more specialized listeners. For example, a Button 146 * exposes a listener to notify clients when the button is clicked.</li> 147 * <li><strong>Set visibility:</strong> You can hide or show views using 148 * {@link #setVisibility(int)}.</li> 149 * </ul> 150 * </p> 151 * <p><em> 152 * Note: The Android framework is responsible for measuring, laying out and 153 * drawing views. You should not call methods that perform these actions on 154 * views yourself unless you are actually implementing a 155 * {@link android.view.ViewGroup}. 156 * </em></p> 157 * 158 * <a name="Lifecycle"></a> 159 * <h3>Implementing a Custom View</h3> 160 * 161 * <p> 162 * To implement a custom view, you will usually begin by providing overrides for 163 * some of the standard methods that the framework calls on all views. You do 164 * not need to override all of these methods. In fact, you can start by just 165 * overriding {@link #onDraw(android.graphics.Canvas)}. 166 * <table border="2" width="85%" align="center" cellpadding="5"> 167 * <thead> 168 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 169 * </thead> 170 * 171 * <tbody> 172 * <tr> 173 * <td rowspan="2">Creation</td> 174 * <td>Constructors</td> 175 * <td>There is a form of the constructor that are called when the view 176 * is created from code and a form that is called when the view is 177 * inflated from a layout file. The second form should parse and apply 178 * any attributes defined in the layout file. 179 * </td> 180 * </tr> 181 * <tr> 182 * <td><code>{@link #onFinishInflate()}</code></td> 183 * <td>Called after a view and all of its children has been inflated 184 * from XML.</td> 185 * </tr> 186 * 187 * <tr> 188 * <td rowspan="3">Layout</td> 189 * <td><code>{@link #onMeasure(int, int)}</code></td> 190 * <td>Called to determine the size requirements for this view and all 191 * of its children. 192 * </td> 193 * </tr> 194 * <tr> 195 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 196 * <td>Called when this view should assign a size and position to all 197 * of its children. 198 * </td> 199 * </tr> 200 * <tr> 201 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 202 * <td>Called when the size of this view has changed. 203 * </td> 204 * </tr> 205 * 206 * <tr> 207 * <td>Drawing</td> 208 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 209 * <td>Called when the view should render its content. 210 * </td> 211 * </tr> 212 * 213 * <tr> 214 * <td rowspan="4">Event processing</td> 215 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 216 * <td>Called when a new hardware key event occurs. 217 * </td> 218 * </tr> 219 * <tr> 220 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 221 * <td>Called when a hardware key up event occurs. 222 * </td> 223 * </tr> 224 * <tr> 225 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 226 * <td>Called when a trackball motion event occurs. 227 * </td> 228 * </tr> 229 * <tr> 230 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 231 * <td>Called when a touch screen motion event occurs. 232 * </td> 233 * </tr> 234 * 235 * <tr> 236 * <td rowspan="2">Focus</td> 237 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 238 * <td>Called when the view gains or loses focus. 239 * </td> 240 * </tr> 241 * 242 * <tr> 243 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 244 * <td>Called when the window containing the view gains or loses focus. 245 * </td> 246 * </tr> 247 * 248 * <tr> 249 * <td rowspan="3">Attaching</td> 250 * <td><code>{@link #onAttachedToWindow()}</code></td> 251 * <td>Called when the view is attached to a window. 252 * </td> 253 * </tr> 254 * 255 * <tr> 256 * <td><code>{@link #onDetachedFromWindow}</code></td> 257 * <td>Called when the view is detached from its window. 258 * </td> 259 * </tr> 260 * 261 * <tr> 262 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 263 * <td>Called when the visibility of the window containing the view 264 * has changed. 265 * </td> 266 * </tr> 267 * </tbody> 268 * 269 * </table> 270 * </p> 271 * 272 * <a name="IDs"></a> 273 * <h3>IDs</h3> 274 * Views may have an integer id associated with them. These ids are typically 275 * assigned in the layout XML files, and are used to find specific views within 276 * the view tree. A common pattern is to: 277 * <ul> 278 * <li>Define a Button in the layout file and assign it a unique ID. 279 * <pre> 280 * <Button 281 * android:id="@+id/my_button" 282 * android:layout_width="wrap_content" 283 * android:layout_height="wrap_content" 284 * android:text="@string/my_button_text"/> 285 * </pre></li> 286 * <li>From the onCreate method of an Activity, find the Button 287 * <pre class="prettyprint"> 288 * Button myButton = (Button) findViewById(R.id.my_button); 289 * </pre></li> 290 * </ul> 291 * <p> 292 * View IDs need not be unique throughout the tree, but it is good practice to 293 * ensure that they are at least unique within the part of the tree you are 294 * searching. 295 * </p> 296 * 297 * <a name="Position"></a> 298 * <h3>Position</h3> 299 * <p> 300 * The geometry of a view is that of a rectangle. A view has a location, 301 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 302 * two dimensions, expressed as a width and a height. The unit for location 303 * and dimensions is the pixel. 304 * </p> 305 * 306 * <p> 307 * It is possible to retrieve the location of a view by invoking the methods 308 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 309 * coordinate of the rectangle representing the view. The latter returns the 310 * top, or Y, coordinate of the rectangle representing the view. These methods 311 * both return the location of the view relative to its parent. For instance, 312 * when getLeft() returns 20, that means the view is located 20 pixels to the 313 * right of the left edge of its direct parent. 314 * </p> 315 * 316 * <p> 317 * In addition, several convenience methods are offered to avoid unnecessary 318 * computations, namely {@link #getRight()} and {@link #getBottom()}. 319 * These methods return the coordinates of the right and bottom edges of the 320 * rectangle representing the view. For instance, calling {@link #getRight()} 321 * is similar to the following computation: <code>getLeft() + getWidth()</code> 322 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 323 * </p> 324 * 325 * <a name="SizePaddingMargins"></a> 326 * <h3>Size, padding and margins</h3> 327 * <p> 328 * The size of a view is expressed with a width and a height. A view actually 329 * possess two pairs of width and height values. 330 * </p> 331 * 332 * <p> 333 * The first pair is known as <em>measured width</em> and 334 * <em>measured height</em>. These dimensions define how big a view wants to be 335 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 336 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 337 * and {@link #getMeasuredHeight()}. 338 * </p> 339 * 340 * <p> 341 * The second pair is simply known as <em>width</em> and <em>height</em>, or 342 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 343 * dimensions define the actual size of the view on screen, at drawing time and 344 * after layout. These values may, but do not have to, be different from the 345 * measured width and height. The width and height can be obtained by calling 346 * {@link #getWidth()} and {@link #getHeight()}. 347 * </p> 348 * 349 * <p> 350 * To measure its dimensions, a view takes into account its padding. The padding 351 * is expressed in pixels for the left, top, right and bottom parts of the view. 352 * Padding can be used to offset the content of the view by a specific amount of 353 * pixels. For instance, a left padding of 2 will push the view's content by 354 * 2 pixels to the right of the left edge. Padding can be set using the 355 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 356 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 357 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 358 * {@link #getPaddingEnd()}. 359 * </p> 360 * 361 * <p> 362 * Even though a view can define a padding, it does not provide any support for 363 * margins. However, view groups provide such a support. Refer to 364 * {@link android.view.ViewGroup} and 365 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 366 * </p> 367 * 368 * <a name="Layout"></a> 369 * <h3>Layout</h3> 370 * <p> 371 * Layout is a two pass process: a measure pass and a layout pass. The measuring 372 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 373 * of the view tree. Each view pushes dimension specifications down the tree 374 * during the recursion. At the end of the measure pass, every view has stored 375 * its measurements. The second pass happens in 376 * {@link #layout(int,int,int,int)} and is also top-down. During 377 * this pass each parent is responsible for positioning all of its children 378 * using the sizes computed in the measure pass. 379 * </p> 380 * 381 * <p> 382 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 383 * {@link #getMeasuredHeight()} values must be set, along with those for all of 384 * that view's descendants. A view's measured width and measured height values 385 * must respect the constraints imposed by the view's parents. This guarantees 386 * that at the end of the measure pass, all parents accept all of their 387 * children's measurements. A parent view may call measure() more than once on 388 * its children. For example, the parent may measure each child once with 389 * unspecified dimensions to find out how big they want to be, then call 390 * measure() on them again with actual numbers if the sum of all the children's 391 * unconstrained sizes is too big or too small. 392 * </p> 393 * 394 * <p> 395 * The measure pass uses two classes to communicate dimensions. The 396 * {@link MeasureSpec} class is used by views to tell their parents how they 397 * want to be measured and positioned. The base LayoutParams class just 398 * describes how big the view wants to be for both width and height. For each 399 * dimension, it can specify one of: 400 * <ul> 401 * <li> an exact number 402 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 403 * (minus padding) 404 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 405 * enclose its content (plus padding). 406 * </ul> 407 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 408 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 409 * an X and Y value. 410 * </p> 411 * 412 * <p> 413 * MeasureSpecs are used to push requirements down the tree from parent to 414 * child. A MeasureSpec can be in one of three modes: 415 * <ul> 416 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 417 * of a child view. For example, a LinearLayout may call measure() on its child 418 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 419 * tall the child view wants to be given a width of 240 pixels. 420 * <li>EXACTLY: This is used by the parent to impose an exact size on the 421 * child. The child must use this size, and guarantee that all of its 422 * descendants will fit within this size. 423 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 424 * child. The child must gurantee that it and all of its descendants will fit 425 * within this size. 426 * </ul> 427 * </p> 428 * 429 * <p> 430 * To intiate a layout, call {@link #requestLayout}. This method is typically 431 * called by a view on itself when it believes that is can no longer fit within 432 * its current bounds. 433 * </p> 434 * 435 * <a name="Drawing"></a> 436 * <h3>Drawing</h3> 437 * <p> 438 * Drawing is handled by walking the tree and rendering each view that 439 * intersects the invalid region. Because the tree is traversed in-order, 440 * this means that parents will draw before (i.e., behind) their children, with 441 * siblings drawn in the order they appear in the tree. 442 * If you set a background drawable for a View, then the View will draw it for you 443 * before calling back to its <code>onDraw()</code> method. 444 * </p> 445 * 446 * <p> 447 * Note that the framework will not draw views that are not in the invalid region. 448 * </p> 449 * 450 * <p> 451 * To force a view to draw, call {@link #invalidate()}. 452 * </p> 453 * 454 * <a name="EventHandlingThreading"></a> 455 * <h3>Event Handling and Threading</h3> 456 * <p> 457 * The basic cycle of a view is as follows: 458 * <ol> 459 * <li>An event comes in and is dispatched to the appropriate view. The view 460 * handles the event and notifies any listeners.</li> 461 * <li>If in the course of processing the event, the view's bounds may need 462 * to be changed, the view will call {@link #requestLayout()}.</li> 463 * <li>Similarly, if in the course of processing the event the view's appearance 464 * may need to be changed, the view will call {@link #invalidate()}.</li> 465 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 466 * the framework will take care of measuring, laying out, and drawing the tree 467 * as appropriate.</li> 468 * </ol> 469 * </p> 470 * 471 * <p><em>Note: The entire view tree is single threaded. You must always be on 472 * the UI thread when calling any method on any view.</em> 473 * If you are doing work on other threads and want to update the state of a view 474 * from that thread, you should use a {@link Handler}. 475 * </p> 476 * 477 * <a name="FocusHandling"></a> 478 * <h3>Focus Handling</h3> 479 * <p> 480 * The framework will handle routine focus movement in response to user input. 481 * This includes changing the focus as views are removed or hidden, or as new 482 * views become available. Views indicate their willingness to take focus 483 * through the {@link #isFocusable} method. To change whether a view can take 484 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 485 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 486 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 487 * </p> 488 * <p> 489 * Focus movement is based on an algorithm which finds the nearest neighbor in a 490 * given direction. In rare cases, the default algorithm may not match the 491 * intended behavior of the developer. In these situations, you can provide 492 * explicit overrides by using these XML attributes in the layout file: 493 * <pre> 494 * nextFocusDown 495 * nextFocusLeft 496 * nextFocusRight 497 * nextFocusUp 498 * </pre> 499 * </p> 500 * 501 * 502 * <p> 503 * To get a particular view to take focus, call {@link #requestFocus()}. 504 * </p> 505 * 506 * <a name="TouchMode"></a> 507 * <h3>Touch Mode</h3> 508 * <p> 509 * When a user is navigating a user interface via directional keys such as a D-pad, it is 510 * necessary to give focus to actionable items such as buttons so the user can see 511 * what will take input. If the device has touch capabilities, however, and the user 512 * begins interacting with the interface by touching it, it is no longer necessary to 513 * always highlight, or give focus to, a particular view. This motivates a mode 514 * for interaction named 'touch mode'. 515 * </p> 516 * <p> 517 * For a touch capable device, once the user touches the screen, the device 518 * will enter touch mode. From this point onward, only views for which 519 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 520 * Other views that are touchable, like buttons, will not take focus when touched; they will 521 * only fire the on click listeners. 522 * </p> 523 * <p> 524 * Any time a user hits a directional key, such as a D-pad direction, the view device will 525 * exit touch mode, and find a view to take focus, so that the user may resume interacting 526 * with the user interface without touching the screen again. 527 * </p> 528 * <p> 529 * The touch mode state is maintained across {@link android.app.Activity}s. Call 530 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 531 * </p> 532 * 533 * <a name="Scrolling"></a> 534 * <h3>Scrolling</h3> 535 * <p> 536 * The framework provides basic support for views that wish to internally 537 * scroll their content. This includes keeping track of the X and Y scroll 538 * offset as well as mechanisms for drawing scrollbars. See 539 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 540 * {@link #awakenScrollBars()} for more details. 541 * </p> 542 * 543 * <a name="Tags"></a> 544 * <h3>Tags</h3> 545 * <p> 546 * Unlike IDs, tags are not used to identify views. Tags are essentially an 547 * extra piece of information that can be associated with a view. They are most 548 * often used as a convenience to store data related to views in the views 549 * themselves rather than by putting them in a separate structure. 550 * </p> 551 * 552 * <a name="Properties"></a> 553 * <h3>Properties</h3> 554 * <p> 555 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 556 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 557 * available both in the {@link Property} form as well as in similarly-named setter/getter 558 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 559 * be used to set persistent state associated with these rendering-related properties on the view. 560 * The properties and methods can also be used in conjunction with 561 * {@link android.animation.Animator Animator}-based animations, described more in the 562 * <a href="#Animation">Animation</a> section. 563 * </p> 564 * 565 * <a name="Animation"></a> 566 * <h3>Animation</h3> 567 * <p> 568 * Starting with Android 3.0, the preferred way of animating views is to use the 569 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 570 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 571 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 572 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 573 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 574 * makes animating these View properties particularly easy and efficient. 575 * </p> 576 * <p> 577 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 578 * You can attach an {@link Animation} object to a view using 579 * {@link #setAnimation(Animation)} or 580 * {@link #startAnimation(Animation)}. The animation can alter the scale, 581 * rotation, translation and alpha of a view over time. If the animation is 582 * attached to a view that has children, the animation will affect the entire 583 * subtree rooted by that node. When an animation is started, the framework will 584 * take care of redrawing the appropriate views until the animation completes. 585 * </p> 586 * 587 * <a name="Security"></a> 588 * <h3>Security</h3> 589 * <p> 590 * Sometimes it is essential that an application be able to verify that an action 591 * is being performed with the full knowledge and consent of the user, such as 592 * granting a permission request, making a purchase or clicking on an advertisement. 593 * Unfortunately, a malicious application could try to spoof the user into 594 * performing these actions, unaware, by concealing the intended purpose of the view. 595 * As a remedy, the framework offers a touch filtering mechanism that can be used to 596 * improve the security of views that provide access to sensitive functionality. 597 * </p><p> 598 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 599 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 600 * will discard touches that are received whenever the view's window is obscured by 601 * another visible window. As a result, the view will not receive touches whenever a 602 * toast, dialog or other window appears above the view's window. 603 * </p><p> 604 * For more fine-grained control over security, consider overriding the 605 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 606 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 607 * </p> 608 * 609 * @attr ref android.R.styleable#View_alpha 610 * @attr ref android.R.styleable#View_background 611 * @attr ref android.R.styleable#View_clickable 612 * @attr ref android.R.styleable#View_contentDescription 613 * @attr ref android.R.styleable#View_drawingCacheQuality 614 * @attr ref android.R.styleable#View_duplicateParentState 615 * @attr ref android.R.styleable#View_id 616 * @attr ref android.R.styleable#View_requiresFadingEdge 617 * @attr ref android.R.styleable#View_fadeScrollbars 618 * @attr ref android.R.styleable#View_fadingEdgeLength 619 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 620 * @attr ref android.R.styleable#View_fitsSystemWindows 621 * @attr ref android.R.styleable#View_isScrollContainer 622 * @attr ref android.R.styleable#View_focusable 623 * @attr ref android.R.styleable#View_focusableInTouchMode 624 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 625 * @attr ref android.R.styleable#View_keepScreenOn 626 * @attr ref android.R.styleable#View_layerType 627 * @attr ref android.R.styleable#View_layoutDirection 628 * @attr ref android.R.styleable#View_longClickable 629 * @attr ref android.R.styleable#View_minHeight 630 * @attr ref android.R.styleable#View_minWidth 631 * @attr ref android.R.styleable#View_nextFocusDown 632 * @attr ref android.R.styleable#View_nextFocusLeft 633 * @attr ref android.R.styleable#View_nextFocusRight 634 * @attr ref android.R.styleable#View_nextFocusUp 635 * @attr ref android.R.styleable#View_onClick 636 * @attr ref android.R.styleable#View_padding 637 * @attr ref android.R.styleable#View_paddingBottom 638 * @attr ref android.R.styleable#View_paddingLeft 639 * @attr ref android.R.styleable#View_paddingRight 640 * @attr ref android.R.styleable#View_paddingTop 641 * @attr ref android.R.styleable#View_paddingStart 642 * @attr ref android.R.styleable#View_paddingEnd 643 * @attr ref android.R.styleable#View_saveEnabled 644 * @attr ref android.R.styleable#View_rotation 645 * @attr ref android.R.styleable#View_rotationX 646 * @attr ref android.R.styleable#View_rotationY 647 * @attr ref android.R.styleable#View_scaleX 648 * @attr ref android.R.styleable#View_scaleY 649 * @attr ref android.R.styleable#View_scrollX 650 * @attr ref android.R.styleable#View_scrollY 651 * @attr ref android.R.styleable#View_scrollbarSize 652 * @attr ref android.R.styleable#View_scrollbarStyle 653 * @attr ref android.R.styleable#View_scrollbars 654 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 655 * @attr ref android.R.styleable#View_scrollbarFadeDuration 656 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 657 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 658 * @attr ref android.R.styleable#View_scrollbarThumbVertical 659 * @attr ref android.R.styleable#View_scrollbarTrackVertical 660 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 661 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 662 * @attr ref android.R.styleable#View_soundEffectsEnabled 663 * @attr ref android.R.styleable#View_tag 664 * @attr ref android.R.styleable#View_textAlignment 665 * @attr ref android.R.styleable#View_textDirection 666 * @attr ref android.R.styleable#View_transformPivotX 667 * @attr ref android.R.styleable#View_transformPivotY 668 * @attr ref android.R.styleable#View_translationX 669 * @attr ref android.R.styleable#View_translationY 670 * @attr ref android.R.styleable#View_visibility 671 * 672 * @see android.view.ViewGroup 673 */ 674public class View implements Drawable.Callback, KeyEvent.Callback, 675 AccessibilityEventSource { 676 private static final boolean DBG = false; 677 678 /** 679 * The logging tag used by this class with android.util.Log. 680 */ 681 protected static final String VIEW_LOG_TAG = "View"; 682 683 /** 684 * When set to true, apps will draw debugging information about their layouts. 685 * 686 * @hide 687 */ 688 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 689 690 /** 691 * Used to mark a View that has no ID. 692 */ 693 public static final int NO_ID = -1; 694 695 /** 696 * Signals that compatibility booleans have been initialized according to 697 * target SDK versions. 698 */ 699 private static boolean sCompatibilityDone = false; 700 701 /** 702 * Use the old (broken) way of building MeasureSpecs. 703 */ 704 private static boolean sUseBrokenMakeMeasureSpec = false; 705 706 /** 707 * Ignore any optimizations using the measure cache. 708 */ 709 private static boolean sIgnoreMeasureCache = false; 710 711 /** 712 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 713 * calling setFlags. 714 */ 715 private static final int NOT_FOCUSABLE = 0x00000000; 716 717 /** 718 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 719 * setFlags. 720 */ 721 private static final int FOCUSABLE = 0x00000001; 722 723 /** 724 * Mask for use with setFlags indicating bits used for focus. 725 */ 726 private static final int FOCUSABLE_MASK = 0x00000001; 727 728 /** 729 * This view will adjust its padding to fit sytem windows (e.g. status bar) 730 */ 731 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 732 733 /** 734 * This view is visible. 735 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 736 * android:visibility}. 737 */ 738 public static final int VISIBLE = 0x00000000; 739 740 /** 741 * This view is invisible, but it still takes up space for layout purposes. 742 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 743 * android:visibility}. 744 */ 745 public static final int INVISIBLE = 0x00000004; 746 747 /** 748 * This view is invisible, and it doesn't take any space for layout 749 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 750 * android:visibility}. 751 */ 752 public static final int GONE = 0x00000008; 753 754 /** 755 * Mask for use with setFlags indicating bits used for visibility. 756 * {@hide} 757 */ 758 static final int VISIBILITY_MASK = 0x0000000C; 759 760 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 761 762 /** 763 * This view is enabled. Interpretation varies by subclass. 764 * Use with ENABLED_MASK when calling setFlags. 765 * {@hide} 766 */ 767 static final int ENABLED = 0x00000000; 768 769 /** 770 * This view is disabled. Interpretation varies by subclass. 771 * Use with ENABLED_MASK when calling setFlags. 772 * {@hide} 773 */ 774 static final int DISABLED = 0x00000020; 775 776 /** 777 * Mask for use with setFlags indicating bits used for indicating whether 778 * this view is enabled 779 * {@hide} 780 */ 781 static final int ENABLED_MASK = 0x00000020; 782 783 /** 784 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 785 * called and further optimizations will be performed. It is okay to have 786 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 787 * {@hide} 788 */ 789 static final int WILL_NOT_DRAW = 0x00000080; 790 791 /** 792 * Mask for use with setFlags indicating bits used for indicating whether 793 * this view is will draw 794 * {@hide} 795 */ 796 static final int DRAW_MASK = 0x00000080; 797 798 /** 799 * <p>This view doesn't show scrollbars.</p> 800 * {@hide} 801 */ 802 static final int SCROLLBARS_NONE = 0x00000000; 803 804 /** 805 * <p>This view shows horizontal scrollbars.</p> 806 * {@hide} 807 */ 808 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 809 810 /** 811 * <p>This view shows vertical scrollbars.</p> 812 * {@hide} 813 */ 814 static final int SCROLLBARS_VERTICAL = 0x00000200; 815 816 /** 817 * <p>Mask for use with setFlags indicating bits used for indicating which 818 * scrollbars are enabled.</p> 819 * {@hide} 820 */ 821 static final int SCROLLBARS_MASK = 0x00000300; 822 823 /** 824 * Indicates that the view should filter touches when its window is obscured. 825 * Refer to the class comments for more information about this security feature. 826 * {@hide} 827 */ 828 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 829 830 /** 831 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 832 * that they are optional and should be skipped if the window has 833 * requested system UI flags that ignore those insets for layout. 834 */ 835 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 836 837 /** 838 * <p>This view doesn't show fading edges.</p> 839 * {@hide} 840 */ 841 static final int FADING_EDGE_NONE = 0x00000000; 842 843 /** 844 * <p>This view shows horizontal fading edges.</p> 845 * {@hide} 846 */ 847 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 848 849 /** 850 * <p>This view shows vertical fading edges.</p> 851 * {@hide} 852 */ 853 static final int FADING_EDGE_VERTICAL = 0x00002000; 854 855 /** 856 * <p>Mask for use with setFlags indicating bits used for indicating which 857 * fading edges are enabled.</p> 858 * {@hide} 859 */ 860 static final int FADING_EDGE_MASK = 0x00003000; 861 862 /** 863 * <p>Indicates this view can be clicked. When clickable, a View reacts 864 * to clicks by notifying the OnClickListener.<p> 865 * {@hide} 866 */ 867 static final int CLICKABLE = 0x00004000; 868 869 /** 870 * <p>Indicates this view is caching its drawing into a bitmap.</p> 871 * {@hide} 872 */ 873 static final int DRAWING_CACHE_ENABLED = 0x00008000; 874 875 /** 876 * <p>Indicates that no icicle should be saved for this view.<p> 877 * {@hide} 878 */ 879 static final int SAVE_DISABLED = 0x000010000; 880 881 /** 882 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 883 * property.</p> 884 * {@hide} 885 */ 886 static final int SAVE_DISABLED_MASK = 0x000010000; 887 888 /** 889 * <p>Indicates that no drawing cache should ever be created for this view.<p> 890 * {@hide} 891 */ 892 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 893 894 /** 895 * <p>Indicates this view can take / keep focus when int touch mode.</p> 896 * {@hide} 897 */ 898 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 899 900 /** 901 * <p>Enables low quality mode for the drawing cache.</p> 902 */ 903 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 904 905 /** 906 * <p>Enables high quality mode for the drawing cache.</p> 907 */ 908 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 909 910 /** 911 * <p>Enables automatic quality mode for the drawing cache.</p> 912 */ 913 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 914 915 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 916 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 917 }; 918 919 /** 920 * <p>Mask for use with setFlags indicating bits used for the cache 921 * quality property.</p> 922 * {@hide} 923 */ 924 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 925 926 /** 927 * <p> 928 * Indicates this view can be long clicked. When long clickable, a View 929 * reacts to long clicks by notifying the OnLongClickListener or showing a 930 * context menu. 931 * </p> 932 * {@hide} 933 */ 934 static final int LONG_CLICKABLE = 0x00200000; 935 936 /** 937 * <p>Indicates that this view gets its drawable states from its direct parent 938 * and ignores its original internal states.</p> 939 * 940 * @hide 941 */ 942 static final int DUPLICATE_PARENT_STATE = 0x00400000; 943 944 /** 945 * The scrollbar style to display the scrollbars inside the content area, 946 * without increasing the padding. The scrollbars will be overlaid with 947 * translucency on the view's content. 948 */ 949 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 950 951 /** 952 * The scrollbar style to display the scrollbars inside the padded area, 953 * increasing the padding of the view. The scrollbars will not overlap the 954 * content area of the view. 955 */ 956 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 957 958 /** 959 * The scrollbar style to display the scrollbars at the edge of the view, 960 * without increasing the padding. The scrollbars will be overlaid with 961 * translucency. 962 */ 963 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 964 965 /** 966 * The scrollbar style to display the scrollbars at the edge of the view, 967 * increasing the padding of the view. The scrollbars will only overlap the 968 * background, if any. 969 */ 970 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 971 972 /** 973 * Mask to check if the scrollbar style is overlay or inset. 974 * {@hide} 975 */ 976 static final int SCROLLBARS_INSET_MASK = 0x01000000; 977 978 /** 979 * Mask to check if the scrollbar style is inside or outside. 980 * {@hide} 981 */ 982 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 983 984 /** 985 * Mask for scrollbar style. 986 * {@hide} 987 */ 988 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 989 990 /** 991 * View flag indicating that the screen should remain on while the 992 * window containing this view is visible to the user. This effectively 993 * takes care of automatically setting the WindowManager's 994 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 995 */ 996 public static final int KEEP_SCREEN_ON = 0x04000000; 997 998 /** 999 * View flag indicating whether this view should have sound effects enabled 1000 * for events such as clicking and touching. 1001 */ 1002 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 1003 1004 /** 1005 * View flag indicating whether this view should have haptic feedback 1006 * enabled for events such as long presses. 1007 */ 1008 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 1009 1010 /** 1011 * <p>Indicates that the view hierarchy should stop saving state when 1012 * it reaches this view. If state saving is initiated immediately at 1013 * the view, it will be allowed. 1014 * {@hide} 1015 */ 1016 static final int PARENT_SAVE_DISABLED = 0x20000000; 1017 1018 /** 1019 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 1020 * {@hide} 1021 */ 1022 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 1023 1024 /** 1025 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1026 * should add all focusable Views regardless if they are focusable in touch mode. 1027 */ 1028 public static final int FOCUSABLES_ALL = 0x00000000; 1029 1030 /** 1031 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1032 * should add only Views focusable in touch mode. 1033 */ 1034 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1035 1036 /** 1037 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1038 * item. 1039 */ 1040 public static final int FOCUS_BACKWARD = 0x00000001; 1041 1042 /** 1043 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1044 * item. 1045 */ 1046 public static final int FOCUS_FORWARD = 0x00000002; 1047 1048 /** 1049 * Use with {@link #focusSearch(int)}. Move focus to the left. 1050 */ 1051 public static final int FOCUS_LEFT = 0x00000011; 1052 1053 /** 1054 * Use with {@link #focusSearch(int)}. Move focus up. 1055 */ 1056 public static final int FOCUS_UP = 0x00000021; 1057 1058 /** 1059 * Use with {@link #focusSearch(int)}. Move focus to the right. 1060 */ 1061 public static final int FOCUS_RIGHT = 0x00000042; 1062 1063 /** 1064 * Use with {@link #focusSearch(int)}. Move focus down. 1065 */ 1066 public static final int FOCUS_DOWN = 0x00000082; 1067 1068 /** 1069 * Bits of {@link #getMeasuredWidthAndState()} and 1070 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1071 */ 1072 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1073 1074 /** 1075 * Bits of {@link #getMeasuredWidthAndState()} and 1076 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1077 */ 1078 public static final int MEASURED_STATE_MASK = 0xff000000; 1079 1080 /** 1081 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1082 * for functions that combine both width and height into a single int, 1083 * such as {@link #getMeasuredState()} and the childState argument of 1084 * {@link #resolveSizeAndState(int, int, int)}. 1085 */ 1086 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1087 1088 /** 1089 * Bit of {@link #getMeasuredWidthAndState()} and 1090 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1091 * is smaller that the space the view would like to have. 1092 */ 1093 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1094 1095 /** 1096 * Base View state sets 1097 */ 1098 // Singles 1099 /** 1100 * Indicates the view has no states set. States are used with 1101 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1102 * view depending on its state. 1103 * 1104 * @see android.graphics.drawable.Drawable 1105 * @see #getDrawableState() 1106 */ 1107 protected static final int[] EMPTY_STATE_SET; 1108 /** 1109 * Indicates the view is enabled. States are used with 1110 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1111 * view depending on its state. 1112 * 1113 * @see android.graphics.drawable.Drawable 1114 * @see #getDrawableState() 1115 */ 1116 protected static final int[] ENABLED_STATE_SET; 1117 /** 1118 * Indicates the view is focused. States are used with 1119 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1120 * view depending on its state. 1121 * 1122 * @see android.graphics.drawable.Drawable 1123 * @see #getDrawableState() 1124 */ 1125 protected static final int[] FOCUSED_STATE_SET; 1126 /** 1127 * Indicates the view is selected. States are used with 1128 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1129 * view depending on its state. 1130 * 1131 * @see android.graphics.drawable.Drawable 1132 * @see #getDrawableState() 1133 */ 1134 protected static final int[] SELECTED_STATE_SET; 1135 /** 1136 * Indicates the view is pressed. States are used with 1137 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1138 * view depending on its state. 1139 * 1140 * @see android.graphics.drawable.Drawable 1141 * @see #getDrawableState() 1142 */ 1143 protected static final int[] PRESSED_STATE_SET; 1144 /** 1145 * Indicates the view's window has focus. States are used with 1146 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1147 * view depending on its state. 1148 * 1149 * @see android.graphics.drawable.Drawable 1150 * @see #getDrawableState() 1151 */ 1152 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1153 // Doubles 1154 /** 1155 * Indicates the view is enabled and has the focus. 1156 * 1157 * @see #ENABLED_STATE_SET 1158 * @see #FOCUSED_STATE_SET 1159 */ 1160 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1161 /** 1162 * Indicates the view is enabled and selected. 1163 * 1164 * @see #ENABLED_STATE_SET 1165 * @see #SELECTED_STATE_SET 1166 */ 1167 protected static final int[] ENABLED_SELECTED_STATE_SET; 1168 /** 1169 * Indicates the view is enabled and that its window has focus. 1170 * 1171 * @see #ENABLED_STATE_SET 1172 * @see #WINDOW_FOCUSED_STATE_SET 1173 */ 1174 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1175 /** 1176 * Indicates the view is focused and selected. 1177 * 1178 * @see #FOCUSED_STATE_SET 1179 * @see #SELECTED_STATE_SET 1180 */ 1181 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1182 /** 1183 * Indicates the view has the focus and that its window has the focus. 1184 * 1185 * @see #FOCUSED_STATE_SET 1186 * @see #WINDOW_FOCUSED_STATE_SET 1187 */ 1188 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1189 /** 1190 * Indicates the view is selected and that its window has the focus. 1191 * 1192 * @see #SELECTED_STATE_SET 1193 * @see #WINDOW_FOCUSED_STATE_SET 1194 */ 1195 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1196 // Triples 1197 /** 1198 * Indicates the view is enabled, focused and selected. 1199 * 1200 * @see #ENABLED_STATE_SET 1201 * @see #FOCUSED_STATE_SET 1202 * @see #SELECTED_STATE_SET 1203 */ 1204 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1205 /** 1206 * Indicates the view is enabled, focused and its window has the focus. 1207 * 1208 * @see #ENABLED_STATE_SET 1209 * @see #FOCUSED_STATE_SET 1210 * @see #WINDOW_FOCUSED_STATE_SET 1211 */ 1212 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1213 /** 1214 * Indicates the view is enabled, selected and its window has the focus. 1215 * 1216 * @see #ENABLED_STATE_SET 1217 * @see #SELECTED_STATE_SET 1218 * @see #WINDOW_FOCUSED_STATE_SET 1219 */ 1220 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1221 /** 1222 * Indicates the view is focused, selected and its window has the focus. 1223 * 1224 * @see #FOCUSED_STATE_SET 1225 * @see #SELECTED_STATE_SET 1226 * @see #WINDOW_FOCUSED_STATE_SET 1227 */ 1228 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1229 /** 1230 * Indicates the view is enabled, focused, selected and its window 1231 * has the focus. 1232 * 1233 * @see #ENABLED_STATE_SET 1234 * @see #FOCUSED_STATE_SET 1235 * @see #SELECTED_STATE_SET 1236 * @see #WINDOW_FOCUSED_STATE_SET 1237 */ 1238 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1239 /** 1240 * Indicates the view is pressed and its window has the focus. 1241 * 1242 * @see #PRESSED_STATE_SET 1243 * @see #WINDOW_FOCUSED_STATE_SET 1244 */ 1245 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1246 /** 1247 * Indicates the view is pressed and selected. 1248 * 1249 * @see #PRESSED_STATE_SET 1250 * @see #SELECTED_STATE_SET 1251 */ 1252 protected static final int[] PRESSED_SELECTED_STATE_SET; 1253 /** 1254 * Indicates the view is pressed, selected and its window has the focus. 1255 * 1256 * @see #PRESSED_STATE_SET 1257 * @see #SELECTED_STATE_SET 1258 * @see #WINDOW_FOCUSED_STATE_SET 1259 */ 1260 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1261 /** 1262 * Indicates the view is pressed and focused. 1263 * 1264 * @see #PRESSED_STATE_SET 1265 * @see #FOCUSED_STATE_SET 1266 */ 1267 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1268 /** 1269 * Indicates the view is pressed, focused and its window has the focus. 1270 * 1271 * @see #PRESSED_STATE_SET 1272 * @see #FOCUSED_STATE_SET 1273 * @see #WINDOW_FOCUSED_STATE_SET 1274 */ 1275 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1276 /** 1277 * Indicates the view is pressed, focused and selected. 1278 * 1279 * @see #PRESSED_STATE_SET 1280 * @see #SELECTED_STATE_SET 1281 * @see #FOCUSED_STATE_SET 1282 */ 1283 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1284 /** 1285 * Indicates the view is pressed, focused, selected and its window has the focus. 1286 * 1287 * @see #PRESSED_STATE_SET 1288 * @see #FOCUSED_STATE_SET 1289 * @see #SELECTED_STATE_SET 1290 * @see #WINDOW_FOCUSED_STATE_SET 1291 */ 1292 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1293 /** 1294 * Indicates the view is pressed and enabled. 1295 * 1296 * @see #PRESSED_STATE_SET 1297 * @see #ENABLED_STATE_SET 1298 */ 1299 protected static final int[] PRESSED_ENABLED_STATE_SET; 1300 /** 1301 * Indicates the view is pressed, enabled and its window has the focus. 1302 * 1303 * @see #PRESSED_STATE_SET 1304 * @see #ENABLED_STATE_SET 1305 * @see #WINDOW_FOCUSED_STATE_SET 1306 */ 1307 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1308 /** 1309 * Indicates the view is pressed, enabled and selected. 1310 * 1311 * @see #PRESSED_STATE_SET 1312 * @see #ENABLED_STATE_SET 1313 * @see #SELECTED_STATE_SET 1314 */ 1315 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1316 /** 1317 * Indicates the view is pressed, enabled, selected and its window has the 1318 * focus. 1319 * 1320 * @see #PRESSED_STATE_SET 1321 * @see #ENABLED_STATE_SET 1322 * @see #SELECTED_STATE_SET 1323 * @see #WINDOW_FOCUSED_STATE_SET 1324 */ 1325 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1326 /** 1327 * Indicates the view is pressed, enabled and focused. 1328 * 1329 * @see #PRESSED_STATE_SET 1330 * @see #ENABLED_STATE_SET 1331 * @see #FOCUSED_STATE_SET 1332 */ 1333 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1334 /** 1335 * Indicates the view is pressed, enabled, focused and its window has the 1336 * focus. 1337 * 1338 * @see #PRESSED_STATE_SET 1339 * @see #ENABLED_STATE_SET 1340 * @see #FOCUSED_STATE_SET 1341 * @see #WINDOW_FOCUSED_STATE_SET 1342 */ 1343 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1344 /** 1345 * Indicates the view is pressed, enabled, focused and selected. 1346 * 1347 * @see #PRESSED_STATE_SET 1348 * @see #ENABLED_STATE_SET 1349 * @see #SELECTED_STATE_SET 1350 * @see #FOCUSED_STATE_SET 1351 */ 1352 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1353 /** 1354 * Indicates the view is pressed, enabled, focused, selected and its window 1355 * has the focus. 1356 * 1357 * @see #PRESSED_STATE_SET 1358 * @see #ENABLED_STATE_SET 1359 * @see #SELECTED_STATE_SET 1360 * @see #FOCUSED_STATE_SET 1361 * @see #WINDOW_FOCUSED_STATE_SET 1362 */ 1363 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1364 1365 /** 1366 * The order here is very important to {@link #getDrawableState()} 1367 */ 1368 private static final int[][] VIEW_STATE_SETS; 1369 1370 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1371 static final int VIEW_STATE_SELECTED = 1 << 1; 1372 static final int VIEW_STATE_FOCUSED = 1 << 2; 1373 static final int VIEW_STATE_ENABLED = 1 << 3; 1374 static final int VIEW_STATE_PRESSED = 1 << 4; 1375 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1376 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1377 static final int VIEW_STATE_HOVERED = 1 << 7; 1378 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1379 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1380 1381 static final int[] VIEW_STATE_IDS = new int[] { 1382 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1383 R.attr.state_selected, VIEW_STATE_SELECTED, 1384 R.attr.state_focused, VIEW_STATE_FOCUSED, 1385 R.attr.state_enabled, VIEW_STATE_ENABLED, 1386 R.attr.state_pressed, VIEW_STATE_PRESSED, 1387 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1388 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1389 R.attr.state_hovered, VIEW_STATE_HOVERED, 1390 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1391 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1392 }; 1393 1394 static { 1395 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1396 throw new IllegalStateException( 1397 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1398 } 1399 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1400 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1401 int viewState = R.styleable.ViewDrawableStates[i]; 1402 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1403 if (VIEW_STATE_IDS[j] == viewState) { 1404 orderedIds[i * 2] = viewState; 1405 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1406 } 1407 } 1408 } 1409 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1410 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1411 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1412 int numBits = Integer.bitCount(i); 1413 int[] set = new int[numBits]; 1414 int pos = 0; 1415 for (int j = 0; j < orderedIds.length; j += 2) { 1416 if ((i & orderedIds[j+1]) != 0) { 1417 set[pos++] = orderedIds[j]; 1418 } 1419 } 1420 VIEW_STATE_SETS[i] = set; 1421 } 1422 1423 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1424 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1425 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1426 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1427 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1428 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1429 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1430 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1431 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1432 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1433 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1434 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1435 | VIEW_STATE_FOCUSED]; 1436 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1437 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1438 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1439 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1440 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1441 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1442 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1443 | VIEW_STATE_ENABLED]; 1444 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1445 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1446 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1448 | VIEW_STATE_ENABLED]; 1449 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1451 | VIEW_STATE_ENABLED]; 1452 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1453 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1454 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1455 1456 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1457 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1459 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1460 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1461 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1462 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1463 | VIEW_STATE_PRESSED]; 1464 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1465 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1466 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1467 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1468 | VIEW_STATE_PRESSED]; 1469 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1470 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1471 | VIEW_STATE_PRESSED]; 1472 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1473 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1474 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1475 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1476 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1477 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1479 | VIEW_STATE_PRESSED]; 1480 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1481 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1482 | VIEW_STATE_PRESSED]; 1483 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1484 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1485 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1486 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1487 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1488 | VIEW_STATE_PRESSED]; 1489 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1490 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1491 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1492 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1493 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1494 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1495 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1496 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1497 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1498 | VIEW_STATE_PRESSED]; 1499 } 1500 1501 /** 1502 * Accessibility event types that are dispatched for text population. 1503 */ 1504 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1505 AccessibilityEvent.TYPE_VIEW_CLICKED 1506 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1507 | AccessibilityEvent.TYPE_VIEW_SELECTED 1508 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1509 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1510 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1511 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1512 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1513 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1514 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1515 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1516 1517 /** 1518 * Temporary Rect currently for use in setBackground(). This will probably 1519 * be extended in the future to hold our own class with more than just 1520 * a Rect. :) 1521 */ 1522 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1523 1524 /** 1525 * Map used to store views' tags. 1526 */ 1527 private SparseArray<Object> mKeyedTags; 1528 1529 /** 1530 * The next available accessibility id. 1531 */ 1532 private static int sNextAccessibilityViewId; 1533 1534 /** 1535 * The animation currently associated with this view. 1536 * @hide 1537 */ 1538 protected Animation mCurrentAnimation = null; 1539 1540 /** 1541 * Width as measured during measure pass. 1542 * {@hide} 1543 */ 1544 @ViewDebug.ExportedProperty(category = "measurement") 1545 int mMeasuredWidth; 1546 1547 /** 1548 * Height as measured during measure pass. 1549 * {@hide} 1550 */ 1551 @ViewDebug.ExportedProperty(category = "measurement") 1552 int mMeasuredHeight; 1553 1554 /** 1555 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1556 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1557 * its display list. This flag, used only when hw accelerated, allows us to clear the 1558 * flag while retaining this information until it's needed (at getDisplayList() time and 1559 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1560 * 1561 * {@hide} 1562 */ 1563 boolean mRecreateDisplayList = false; 1564 1565 /** 1566 * The view's identifier. 1567 * {@hide} 1568 * 1569 * @see #setId(int) 1570 * @see #getId() 1571 */ 1572 @ViewDebug.ExportedProperty(resolveId = true) 1573 int mID = NO_ID; 1574 1575 /** 1576 * The stable ID of this view for accessibility purposes. 1577 */ 1578 int mAccessibilityViewId = NO_ID; 1579 1580 private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 1581 1582 SendViewStateChangedAccessibilityEvent mSendViewStateChangedAccessibilityEvent; 1583 1584 /** 1585 * The view's tag. 1586 * {@hide} 1587 * 1588 * @see #setTag(Object) 1589 * @see #getTag() 1590 */ 1591 protected Object mTag; 1592 1593 // for mPrivateFlags: 1594 /** {@hide} */ 1595 static final int PFLAG_WANTS_FOCUS = 0x00000001; 1596 /** {@hide} */ 1597 static final int PFLAG_FOCUSED = 0x00000002; 1598 /** {@hide} */ 1599 static final int PFLAG_SELECTED = 0x00000004; 1600 /** {@hide} */ 1601 static final int PFLAG_IS_ROOT_NAMESPACE = 0x00000008; 1602 /** {@hide} */ 1603 static final int PFLAG_HAS_BOUNDS = 0x00000010; 1604 /** {@hide} */ 1605 static final int PFLAG_DRAWN = 0x00000020; 1606 /** 1607 * When this flag is set, this view is running an animation on behalf of its 1608 * children and should therefore not cancel invalidate requests, even if they 1609 * lie outside of this view's bounds. 1610 * 1611 * {@hide} 1612 */ 1613 static final int PFLAG_DRAW_ANIMATION = 0x00000040; 1614 /** {@hide} */ 1615 static final int PFLAG_SKIP_DRAW = 0x00000080; 1616 /** {@hide} */ 1617 static final int PFLAG_ONLY_DRAWS_BACKGROUND = 0x00000100; 1618 /** {@hide} */ 1619 static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1620 /** {@hide} */ 1621 static final int PFLAG_DRAWABLE_STATE_DIRTY = 0x00000400; 1622 /** {@hide} */ 1623 static final int PFLAG_MEASURED_DIMENSION_SET = 0x00000800; 1624 /** {@hide} */ 1625 static final int PFLAG_FORCE_LAYOUT = 0x00001000; 1626 /** {@hide} */ 1627 static final int PFLAG_LAYOUT_REQUIRED = 0x00002000; 1628 1629 private static final int PFLAG_PRESSED = 0x00004000; 1630 1631 /** {@hide} */ 1632 static final int PFLAG_DRAWING_CACHE_VALID = 0x00008000; 1633 /** 1634 * Flag used to indicate that this view should be drawn once more (and only once 1635 * more) after its animation has completed. 1636 * {@hide} 1637 */ 1638 static final int PFLAG_ANIMATION_STARTED = 0x00010000; 1639 1640 private static final int PFLAG_SAVE_STATE_CALLED = 0x00020000; 1641 1642 /** 1643 * Indicates that the View returned true when onSetAlpha() was called and that 1644 * the alpha must be restored. 1645 * {@hide} 1646 */ 1647 static final int PFLAG_ALPHA_SET = 0x00040000; 1648 1649 /** 1650 * Set by {@link #setScrollContainer(boolean)}. 1651 */ 1652 static final int PFLAG_SCROLL_CONTAINER = 0x00080000; 1653 1654 /** 1655 * Set by {@link #setScrollContainer(boolean)}. 1656 */ 1657 static final int PFLAG_SCROLL_CONTAINER_ADDED = 0x00100000; 1658 1659 /** 1660 * View flag indicating whether this view was invalidated (fully or partially.) 1661 * 1662 * @hide 1663 */ 1664 static final int PFLAG_DIRTY = 0x00200000; 1665 1666 /** 1667 * View flag indicating whether this view was invalidated by an opaque 1668 * invalidate request. 1669 * 1670 * @hide 1671 */ 1672 static final int PFLAG_DIRTY_OPAQUE = 0x00400000; 1673 1674 /** 1675 * Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}. 1676 * 1677 * @hide 1678 */ 1679 static final int PFLAG_DIRTY_MASK = 0x00600000; 1680 1681 /** 1682 * Indicates whether the background is opaque. 1683 * 1684 * @hide 1685 */ 1686 static final int PFLAG_OPAQUE_BACKGROUND = 0x00800000; 1687 1688 /** 1689 * Indicates whether the scrollbars are opaque. 1690 * 1691 * @hide 1692 */ 1693 static final int PFLAG_OPAQUE_SCROLLBARS = 0x01000000; 1694 1695 /** 1696 * Indicates whether the view is opaque. 1697 * 1698 * @hide 1699 */ 1700 static final int PFLAG_OPAQUE_MASK = 0x01800000; 1701 1702 /** 1703 * Indicates a prepressed state; 1704 * the short time between ACTION_DOWN and recognizing 1705 * a 'real' press. Prepressed is used to recognize quick taps 1706 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1707 * 1708 * @hide 1709 */ 1710 private static final int PFLAG_PREPRESSED = 0x02000000; 1711 1712 /** 1713 * Indicates whether the view is temporarily detached. 1714 * 1715 * @hide 1716 */ 1717 static final int PFLAG_CANCEL_NEXT_UP_EVENT = 0x04000000; 1718 1719 /** 1720 * Indicates that we should awaken scroll bars once attached 1721 * 1722 * @hide 1723 */ 1724 private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1725 1726 /** 1727 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1728 * @hide 1729 */ 1730 private static final int PFLAG_HOVERED = 0x10000000; 1731 1732 /** 1733 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1734 * for transform operations 1735 * 1736 * @hide 1737 */ 1738 private static final int PFLAG_PIVOT_EXPLICITLY_SET = 0x20000000; 1739 1740 /** {@hide} */ 1741 static final int PFLAG_ACTIVATED = 0x40000000; 1742 1743 /** 1744 * Indicates that this view was specifically invalidated, not just dirtied because some 1745 * child view was invalidated. The flag is used to determine when we need to recreate 1746 * a view's display list (as opposed to just returning a reference to its existing 1747 * display list). 1748 * 1749 * @hide 1750 */ 1751 static final int PFLAG_INVALIDATED = 0x80000000; 1752 1753 /** 1754 * Masks for mPrivateFlags2, as generated by dumpFlags(): 1755 * 1756 * |-------|-------|-------|-------| 1757 * 1 PFLAG2_DRAG_CAN_ACCEPT 1758 * 1 PFLAG2_DRAG_HOVERED 1759 * 11 PFLAG2_LAYOUT_DIRECTION_MASK 1760 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL 1761 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED 1762 * 11 PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK 1763 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[1] 1764 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[2] 1765 * 11 PFLAG2_TEXT_DIRECTION_FLAGS[3] 1766 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[4] 1767 * 1 1 PFLAG2_TEXT_DIRECTION_FLAGS[5] 1768 * 111 PFLAG2_TEXT_DIRECTION_MASK 1769 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED 1770 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT 1771 * 111 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK 1772 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[1] 1773 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[2] 1774 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[3] 1775 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[4] 1776 * 1 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[5] 1777 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[6] 1778 * 111 PFLAG2_TEXT_ALIGNMENT_MASK 1779 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED 1780 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT 1781 * 111 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK 1782 * 111 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK 1783 * 11 PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK 1784 * 1 PFLAG2_ACCESSIBILITY_FOCUSED 1785 * 1 PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED 1786 * 1 PFLAG2_VIEW_QUICK_REJECTED 1787 * 1 PFLAG2_PADDING_RESOLVED 1788 * 1 PFLAG2_DRAWABLE_RESOLVED 1789 * 1 PFLAG2_HAS_TRANSIENT_STATE 1790 * |-------|-------|-------|-------| 1791 */ 1792 1793 /** 1794 * Indicates that this view has reported that it can accept the current drag's content. 1795 * Cleared when the drag operation concludes. 1796 * @hide 1797 */ 1798 static final int PFLAG2_DRAG_CAN_ACCEPT = 0x00000001; 1799 1800 /** 1801 * Indicates that this view is currently directly under the drag location in a 1802 * drag-and-drop operation involving content that it can accept. Cleared when 1803 * the drag exits the view, or when the drag operation concludes. 1804 * @hide 1805 */ 1806 static final int PFLAG2_DRAG_HOVERED = 0x00000002; 1807 1808 /** 1809 * Horizontal layout direction of this view is from Left to Right. 1810 * Use with {@link #setLayoutDirection}. 1811 */ 1812 public static final int LAYOUT_DIRECTION_LTR = LayoutDirection.LTR; 1813 1814 /** 1815 * Horizontal layout direction of this view is from Right to Left. 1816 * Use with {@link #setLayoutDirection}. 1817 */ 1818 public static final int LAYOUT_DIRECTION_RTL = LayoutDirection.RTL; 1819 1820 /** 1821 * Horizontal layout direction of this view is inherited from its parent. 1822 * Use with {@link #setLayoutDirection}. 1823 */ 1824 public static final int LAYOUT_DIRECTION_INHERIT = LayoutDirection.INHERIT; 1825 1826 /** 1827 * Horizontal layout direction of this view is from deduced from the default language 1828 * script for the locale. Use with {@link #setLayoutDirection}. 1829 */ 1830 public static final int LAYOUT_DIRECTION_LOCALE = LayoutDirection.LOCALE; 1831 1832 /** 1833 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1834 * @hide 1835 */ 1836 static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2; 1837 1838 /** 1839 * Mask for use with private flags indicating bits used for horizontal layout direction. 1840 * @hide 1841 */ 1842 static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1843 1844 /** 1845 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1846 * right-to-left direction. 1847 * @hide 1848 */ 1849 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1850 1851 /** 1852 * Indicates whether the view horizontal layout direction has been resolved. 1853 * @hide 1854 */ 1855 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1856 1857 /** 1858 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1859 * @hide 1860 */ 1861 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C 1862 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1863 1864 /* 1865 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1866 * flag value. 1867 * @hide 1868 */ 1869 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1870 LAYOUT_DIRECTION_LTR, 1871 LAYOUT_DIRECTION_RTL, 1872 LAYOUT_DIRECTION_INHERIT, 1873 LAYOUT_DIRECTION_LOCALE 1874 }; 1875 1876 /** 1877 * Default horizontal layout direction. 1878 */ 1879 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1880 1881 /** 1882 * Default horizontal layout direction. 1883 * @hide 1884 */ 1885 static final int LAYOUT_DIRECTION_RESOLVED_DEFAULT = LAYOUT_DIRECTION_LTR; 1886 1887 /** 1888 * Text direction is inherited thru {@link ViewGroup} 1889 */ 1890 public static final int TEXT_DIRECTION_INHERIT = 0; 1891 1892 /** 1893 * Text direction is using "first strong algorithm". The first strong directional character 1894 * determines the paragraph direction. If there is no strong directional character, the 1895 * paragraph direction is the view's resolved layout direction. 1896 */ 1897 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1898 1899 /** 1900 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1901 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1902 * If there are neither, the paragraph direction is the view's resolved layout direction. 1903 */ 1904 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1905 1906 /** 1907 * Text direction is forced to LTR. 1908 */ 1909 public static final int TEXT_DIRECTION_LTR = 3; 1910 1911 /** 1912 * Text direction is forced to RTL. 1913 */ 1914 public static final int TEXT_DIRECTION_RTL = 4; 1915 1916 /** 1917 * Text direction is coming from the system Locale. 1918 */ 1919 public static final int TEXT_DIRECTION_LOCALE = 5; 1920 1921 /** 1922 * Default text direction is inherited 1923 */ 1924 private static final int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1925 1926 /** 1927 * Default resolved text direction 1928 * @hide 1929 */ 1930 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_FIRST_STRONG; 1931 1932 /** 1933 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1934 * @hide 1935 */ 1936 static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6; 1937 1938 /** 1939 * Mask for use with private flags indicating bits used for text direction. 1940 * @hide 1941 */ 1942 static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007 1943 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1944 1945 /** 1946 * Array of text direction flags for mapping attribute "textDirection" to correct 1947 * flag value. 1948 * @hide 1949 */ 1950 private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = { 1951 TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1952 TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1953 TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1954 TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1955 TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1956 TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1957 }; 1958 1959 /** 1960 * Indicates whether the view text direction has been resolved. 1961 * @hide 1962 */ 1963 static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008 1964 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1965 1966 /** 1967 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1968 * @hide 1969 */ 1970 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1971 1972 /** 1973 * Mask for use with private flags indicating bits used for resolved text direction. 1974 * @hide 1975 */ 1976 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 1977 << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1978 1979 /** 1980 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1981 * @hide 1982 */ 1983 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT = 1984 TEXT_DIRECTION_RESOLVED_DEFAULT << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1985 1986 /* 1987 * Default text alignment. The text alignment of this View is inherited from its parent. 1988 * Use with {@link #setTextAlignment(int)} 1989 */ 1990 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1991 1992 /** 1993 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1994 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1995 * 1996 * Use with {@link #setTextAlignment(int)} 1997 */ 1998 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1999 2000 /** 2001 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 2002 * 2003 * Use with {@link #setTextAlignment(int)} 2004 */ 2005 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 2006 2007 /** 2008 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 2009 * 2010 * Use with {@link #setTextAlignment(int)} 2011 */ 2012 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2013 2014 /** 2015 * Center the paragraph, e.g. ALIGN_CENTER. 2016 * 2017 * Use with {@link #setTextAlignment(int)} 2018 */ 2019 public static final int TEXT_ALIGNMENT_CENTER = 4; 2020 2021 /** 2022 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2023 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2024 * 2025 * Use with {@link #setTextAlignment(int)} 2026 */ 2027 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2028 2029 /** 2030 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2031 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2032 * 2033 * Use with {@link #setTextAlignment(int)} 2034 */ 2035 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2036 2037 /** 2038 * Default text alignment is inherited 2039 */ 2040 private static final int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2041 2042 /** 2043 * Default resolved text alignment 2044 * @hide 2045 */ 2046 static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2047 2048 /** 2049 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2050 * @hide 2051 */ 2052 static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13; 2053 2054 /** 2055 * Mask for use with private flags indicating bits used for text alignment. 2056 * @hide 2057 */ 2058 static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2059 2060 /** 2061 * Array of text direction flags for mapping attribute "textAlignment" to correct 2062 * flag value. 2063 * @hide 2064 */ 2065 private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = { 2066 TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2067 TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2068 TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2069 TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2070 TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2071 TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2072 TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 2073 }; 2074 2075 /** 2076 * Indicates whether the view text alignment has been resolved. 2077 * @hide 2078 */ 2079 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2080 2081 /** 2082 * Bit shift to get the resolved text alignment. 2083 * @hide 2084 */ 2085 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2086 2087 /** 2088 * Mask for use with private flags indicating bits used for text alignment. 2089 * @hide 2090 */ 2091 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 2092 << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2093 2094 /** 2095 * Indicates whether if the view text alignment has been resolved to gravity 2096 */ 2097 private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2098 TEXT_ALIGNMENT_RESOLVED_DEFAULT << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2099 2100 // Accessiblity constants for mPrivateFlags2 2101 2102 /** 2103 * Shift for the bits in {@link #mPrivateFlags2} related to the 2104 * "importantForAccessibility" attribute. 2105 */ 2106 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2107 2108 /** 2109 * Automatically determine whether a view is important for accessibility. 2110 */ 2111 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2112 2113 /** 2114 * The view is important for accessibility. 2115 */ 2116 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2117 2118 /** 2119 * The view is not important for accessibility. 2120 */ 2121 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2122 2123 /** 2124 * The view is not important for accessibility, nor are any of its 2125 * descendant views. 2126 */ 2127 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS = 0x00000004; 2128 2129 /** 2130 * The default whether the view is important for accessibility. 2131 */ 2132 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2133 2134 /** 2135 * Mask for obtainig the bits which specify how to determine 2136 * whether a view is important for accessibility. 2137 */ 2138 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2139 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO 2140 | IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) 2141 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2142 2143 /** 2144 * Shift for the bits in {@link #mPrivateFlags2} related to the 2145 * "accessibilityLiveRegion" attribute. 2146 */ 2147 static final int PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT = 23; 2148 2149 /** 2150 * Live region mode specifying that accessibility services should not 2151 * automatically announce changes to this view. This is the default live 2152 * region mode for most views. 2153 * <p> 2154 * Use with {@link #setAccessibilityLiveRegion(int)}. 2155 */ 2156 public static final int ACCESSIBILITY_LIVE_REGION_NONE = 0x00000000; 2157 2158 /** 2159 * Live region mode specifying that accessibility services should announce 2160 * changes to this view. 2161 * <p> 2162 * Use with {@link #setAccessibilityLiveRegion(int)}. 2163 */ 2164 public static final int ACCESSIBILITY_LIVE_REGION_POLITE = 0x00000001; 2165 2166 /** 2167 * Live region mode specifying that accessibility services should interrupt 2168 * ongoing speech to immediately announce changes to this view. 2169 * <p> 2170 * Use with {@link #setAccessibilityLiveRegion(int)}. 2171 */ 2172 public static final int ACCESSIBILITY_LIVE_REGION_ASSERTIVE = 0x00000002; 2173 2174 /** 2175 * The default whether the view is important for accessibility. 2176 */ 2177 static final int ACCESSIBILITY_LIVE_REGION_DEFAULT = ACCESSIBILITY_LIVE_REGION_NONE; 2178 2179 /** 2180 * Mask for obtaining the bits which specify a view's accessibility live 2181 * region mode. 2182 */ 2183 static final int PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK = (ACCESSIBILITY_LIVE_REGION_NONE 2184 | ACCESSIBILITY_LIVE_REGION_POLITE | ACCESSIBILITY_LIVE_REGION_ASSERTIVE) 2185 << PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT; 2186 2187 /** 2188 * Flag indicating whether a view has accessibility focus. 2189 */ 2190 static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x04000000; 2191 2192 /** 2193 * Flag whether the accessibility state of the subtree rooted at this view changed. 2194 */ 2195 static final int PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED = 0x08000000; 2196 2197 /** 2198 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2199 * is used to check whether later changes to the view's transform should invalidate the 2200 * view to force the quickReject test to run again. 2201 */ 2202 static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000; 2203 2204 /** 2205 * Flag indicating that start/end padding has been resolved into left/right padding 2206 * for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()} 2207 * and checked by {@link #measure(int, int)} to determine if padding needs to be resolved 2208 * during measurement. In some special cases this is required such as when an adapter-based 2209 * view measures prospective children without attaching them to a window. 2210 */ 2211 static final int PFLAG2_PADDING_RESOLVED = 0x20000000; 2212 2213 /** 2214 * Flag indicating that the start/end drawables has been resolved into left/right ones. 2215 */ 2216 static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000; 2217 2218 /** 2219 * Indicates that the view is tracking some sort of transient state 2220 * that the app should not need to be aware of, but that the framework 2221 * should take special care to preserve. 2222 */ 2223 static final int PFLAG2_HAS_TRANSIENT_STATE = 0x80000000; 2224 2225 /** 2226 * Group of bits indicating that RTL properties resolution is done. 2227 */ 2228 static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED | 2229 PFLAG2_TEXT_DIRECTION_RESOLVED | 2230 PFLAG2_TEXT_ALIGNMENT_RESOLVED | 2231 PFLAG2_PADDING_RESOLVED | 2232 PFLAG2_DRAWABLE_RESOLVED; 2233 2234 // There are a couple of flags left in mPrivateFlags2 2235 2236 /* End of masks for mPrivateFlags2 */ 2237 2238 /* Masks for mPrivateFlags3 */ 2239 2240 /** 2241 * Flag indicating that view has a transform animation set on it. This is used to track whether 2242 * an animation is cleared between successive frames, in order to tell the associated 2243 * DisplayList to clear its animation matrix. 2244 */ 2245 static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1; 2246 2247 /** 2248 * Flag indicating that view has an alpha animation set on it. This is used to track whether an 2249 * animation is cleared between successive frames, in order to tell the associated 2250 * DisplayList to restore its alpha value. 2251 */ 2252 static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2; 2253 2254 /** 2255 * Flag indicating that the view has been through at least one layout since it 2256 * was last attached to a window. 2257 */ 2258 static final int PFLAG3_IS_LAID_OUT = 0x4; 2259 2260 /** 2261 * Flag indicating that a call to measure() was skipped and should be done 2262 * instead when layout() is invoked. 2263 */ 2264 static final int PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT = 0x8; 2265 2266 /** 2267 * Flag indicating that an overridden method correctly called down to 2268 * the superclass implementation as required by the API spec. 2269 */ 2270 static final int PFLAG3_CALLED_SUPER = 0x10; 2271 2272 2273 /* End of masks for mPrivateFlags3 */ 2274 2275 static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED; 2276 2277 /** 2278 * Always allow a user to over-scroll this view, provided it is a 2279 * view that can scroll. 2280 * 2281 * @see #getOverScrollMode() 2282 * @see #setOverScrollMode(int) 2283 */ 2284 public static final int OVER_SCROLL_ALWAYS = 0; 2285 2286 /** 2287 * Allow a user to over-scroll this view only if the content is large 2288 * enough to meaningfully scroll, provided it is a view that can scroll. 2289 * 2290 * @see #getOverScrollMode() 2291 * @see #setOverScrollMode(int) 2292 */ 2293 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2294 2295 /** 2296 * Never allow a user to over-scroll this view. 2297 * 2298 * @see #getOverScrollMode() 2299 * @see #setOverScrollMode(int) 2300 */ 2301 public static final int OVER_SCROLL_NEVER = 2; 2302 2303 /** 2304 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2305 * requested the system UI (status bar) to be visible (the default). 2306 * 2307 * @see #setSystemUiVisibility(int) 2308 */ 2309 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2310 2311 /** 2312 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2313 * system UI to enter an unobtrusive "low profile" mode. 2314 * 2315 * <p>This is for use in games, book readers, video players, or any other 2316 * "immersive" application where the usual system chrome is deemed too distracting. 2317 * 2318 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2319 * 2320 * @see #setSystemUiVisibility(int) 2321 */ 2322 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2323 2324 /** 2325 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2326 * system navigation be temporarily hidden. 2327 * 2328 * <p>This is an even less obtrusive state than that called for by 2329 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2330 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2331 * those to disappear. This is useful (in conjunction with the 2332 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2333 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2334 * window flags) for displaying content using every last pixel on the display. 2335 * 2336 * <p>There is a limitation: because navigation controls are so important, the least user 2337 * interaction will cause them to reappear immediately. When this happens, both 2338 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2339 * so that both elements reappear at the same time. 2340 * 2341 * @see #setSystemUiVisibility(int) 2342 */ 2343 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2344 2345 /** 2346 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2347 * into the normal fullscreen mode so that its content can take over the screen 2348 * while still allowing the user to interact with the application. 2349 * 2350 * <p>This has the same visual effect as 2351 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2352 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2353 * meaning that non-critical screen decorations (such as the status bar) will be 2354 * hidden while the user is in the View's window, focusing the experience on 2355 * that content. Unlike the window flag, if you are using ActionBar in 2356 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2357 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2358 * hide the action bar. 2359 * 2360 * <p>This approach to going fullscreen is best used over the window flag when 2361 * it is a transient state -- that is, the application does this at certain 2362 * points in its user interaction where it wants to allow the user to focus 2363 * on content, but not as a continuous state. For situations where the application 2364 * would like to simply stay full screen the entire time (such as a game that 2365 * wants to take over the screen), the 2366 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2367 * is usually a better approach. The state set here will be removed by the system 2368 * in various situations (such as the user moving to another application) like 2369 * the other system UI states. 2370 * 2371 * <p>When using this flag, the application should provide some easy facility 2372 * for the user to go out of it. A common example would be in an e-book 2373 * reader, where tapping on the screen brings back whatever screen and UI 2374 * decorations that had been hidden while the user was immersed in reading 2375 * the book. 2376 * 2377 * @see #setSystemUiVisibility(int) 2378 */ 2379 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2380 2381 /** 2382 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2383 * flags, we would like a stable view of the content insets given to 2384 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2385 * will always represent the worst case that the application can expect 2386 * as a continuous state. In the stock Android UI this is the space for 2387 * the system bar, nav bar, and status bar, but not more transient elements 2388 * such as an input method. 2389 * 2390 * The stable layout your UI sees is based on the system UI modes you can 2391 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2392 * then you will get a stable layout for changes of the 2393 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2394 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2395 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2396 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2397 * with a stable layout. (Note that you should avoid using 2398 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2399 * 2400 * If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN} 2401 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2402 * then a hidden status bar will be considered a "stable" state for purposes 2403 * here. This allows your UI to continually hide the status bar, while still 2404 * using the system UI flags to hide the action bar while still retaining 2405 * a stable layout. Note that changing the window fullscreen flag will never 2406 * provide a stable layout for a clean transition. 2407 * 2408 * <p>If you are using ActionBar in 2409 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2410 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2411 * insets it adds to those given to the application. 2412 */ 2413 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2414 2415 /** 2416 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2417 * to be layed out as if it has requested 2418 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2419 * allows it to avoid artifacts when switching in and out of that mode, at 2420 * the expense that some of its user interface may be covered by screen 2421 * decorations when they are shown. You can perform layout of your inner 2422 * UI elements to account for the navigation system UI through the 2423 * {@link #fitSystemWindows(Rect)} method. 2424 */ 2425 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2426 2427 /** 2428 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2429 * to be layed out as if it has requested 2430 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2431 * allows it to avoid artifacts when switching in and out of that mode, at 2432 * the expense that some of its user interface may be covered by screen 2433 * decorations when they are shown. You can perform layout of your inner 2434 * UI elements to account for non-fullscreen system UI through the 2435 * {@link #fitSystemWindows(Rect)} method. 2436 */ 2437 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2438 2439 /** 2440 * Flag for {@link #setSystemUiVisibility(int)}: View would like to remain interactive when 2441 * hiding the navigation bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. If this flag is 2442 * not set, {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} will be force cleared by the system on any 2443 * user interaction. 2444 * <p>Since this flag is a modifier for {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, it only 2445 * has an effect when used in combination with that flag.</p> 2446 */ 2447 public static final int SYSTEM_UI_FLAG_IMMERSIVE = 0x00000800; 2448 2449 /** 2450 * Flag for {@link #setSystemUiVisibility(int)}: View would like to remain interactive when 2451 * hiding the status bar with {@link #SYSTEM_UI_FLAG_FULLSCREEN} and/or hiding the navigation 2452 * bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. Use this flag to create an immersive 2453 * experience while also hiding the system bars. If this flag is not set, 2454 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} will be force cleared by the system on any user 2455 * interaction, and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be force-cleared by the system 2456 * if the user swipes from the top of the screen. 2457 * <p>When system bars are hidden in immersive mode, they can be revealed temporarily with 2458 * system gestures, such as swiping from the top of the screen. These transient system bars 2459 * will overlay app’s content, may have some degree of transparency, and will automatically 2460 * hide after a short timeout. 2461 * </p><p>Since this flag is a modifier for {@link #SYSTEM_UI_FLAG_FULLSCREEN} and 2462 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, it only has an effect when used in combination 2463 * with one or both of those flags.</p> 2464 */ 2465 public static final int SYSTEM_UI_FLAG_IMMERSIVE_STICKY = 0x00001000; 2466 2467 /** 2468 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2469 */ 2470 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2471 2472 /** 2473 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2474 */ 2475 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2476 2477 /** 2478 * @hide 2479 * 2480 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2481 * out of the public fields to keep the undefined bits out of the developer's way. 2482 * 2483 * Flag to make the status bar not expandable. Unless you also 2484 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2485 */ 2486 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2487 2488 /** 2489 * @hide 2490 * 2491 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2492 * out of the public fields to keep the undefined bits out of the developer's way. 2493 * 2494 * Flag to hide notification icons and scrolling ticker text. 2495 */ 2496 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2497 2498 /** 2499 * @hide 2500 * 2501 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2502 * out of the public fields to keep the undefined bits out of the developer's way. 2503 * 2504 * Flag to disable incoming notification alerts. This will not block 2505 * icons, but it will block sound, vibrating and other visual or aural notifications. 2506 */ 2507 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2508 2509 /** 2510 * @hide 2511 * 2512 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2513 * out of the public fields to keep the undefined bits out of the developer's way. 2514 * 2515 * Flag to hide only the scrolling ticker. Note that 2516 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2517 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2518 */ 2519 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2520 2521 /** 2522 * @hide 2523 * 2524 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2525 * out of the public fields to keep the undefined bits out of the developer's way. 2526 * 2527 * Flag to hide the center system info area. 2528 */ 2529 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2530 2531 /** 2532 * @hide 2533 * 2534 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2535 * out of the public fields to keep the undefined bits out of the developer's way. 2536 * 2537 * Flag to hide only the home button. Don't use this 2538 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2539 */ 2540 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2541 2542 /** 2543 * @hide 2544 * 2545 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2546 * out of the public fields to keep the undefined bits out of the developer's way. 2547 * 2548 * Flag to hide only the back button. Don't use this 2549 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2550 */ 2551 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2552 2553 /** 2554 * @hide 2555 * 2556 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2557 * out of the public fields to keep the undefined bits out of the developer's way. 2558 * 2559 * Flag to hide only the clock. You might use this if your activity has 2560 * its own clock making the status bar's clock redundant. 2561 */ 2562 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2563 2564 /** 2565 * @hide 2566 * 2567 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2568 * out of the public fields to keep the undefined bits out of the developer's way. 2569 * 2570 * Flag to hide only the recent apps button. Don't use this 2571 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2572 */ 2573 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2574 2575 /** 2576 * @hide 2577 * 2578 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2579 * out of the public fields to keep the undefined bits out of the developer's way. 2580 * 2581 * Flag to disable the global search gesture. Don't use this 2582 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2583 */ 2584 public static final int STATUS_BAR_DISABLE_SEARCH = 0x02000000; 2585 2586 /** 2587 * @hide 2588 * 2589 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2590 * out of the public fields to keep the undefined bits out of the developer's way. 2591 * 2592 * Flag to specify that the status bar is displayed in transient mode. 2593 */ 2594 public static final int STATUS_BAR_TRANSIENT = 0x04000000; 2595 2596 /** 2597 * @hide 2598 * 2599 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2600 * out of the public fields to keep the undefined bits out of the developer's way. 2601 * 2602 * Flag to specify that the navigation bar is displayed in transient mode. 2603 */ 2604 public static final int NAVIGATION_BAR_TRANSIENT = 0x08000000; 2605 2606 /** 2607 * @hide 2608 * 2609 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2610 * out of the public fields to keep the undefined bits out of the developer's way. 2611 * 2612 * Flag to specify that the hidden status bar would like to be shown. 2613 */ 2614 public static final int STATUS_BAR_UNHIDE = 0x10000000; 2615 2616 /** 2617 * @hide 2618 * 2619 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2620 * out of the public fields to keep the undefined bits out of the developer's way. 2621 * 2622 * Flag to specify that the hidden navigation bar would like to be shown. 2623 */ 2624 public static final int NAVIGATION_BAR_UNHIDE = 0x20000000; 2625 2626 /** 2627 * @hide 2628 * 2629 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2630 * out of the public fields to keep the undefined bits out of the developer's way. 2631 * 2632 * Flag to specify that the status bar is displayed in translucent mode. 2633 */ 2634 public static final int STATUS_BAR_TRANSLUCENT = 0x40000000; 2635 2636 /** 2637 * @hide 2638 * 2639 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2640 * out of the public fields to keep the undefined bits out of the developer's way. 2641 * 2642 * Flag to specify that the navigation bar is displayed in translucent mode. 2643 */ 2644 public static final int NAVIGATION_BAR_TRANSLUCENT = 0x80000000; 2645 2646 /** 2647 * @hide 2648 */ 2649 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2650 2651 /** 2652 * These are the system UI flags that can be cleared by events outside 2653 * of an application. Currently this is just the ability to tap on the 2654 * screen while hiding the navigation bar to have it return. 2655 * @hide 2656 */ 2657 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2658 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2659 | SYSTEM_UI_FLAG_FULLSCREEN; 2660 2661 /** 2662 * Flags that can impact the layout in relation to system UI. 2663 */ 2664 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2665 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2666 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2667 2668 /** 2669 * Find views that render the specified text. 2670 * 2671 * @see #findViewsWithText(ArrayList, CharSequence, int) 2672 */ 2673 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2674 2675 /** 2676 * Find find views that contain the specified content description. 2677 * 2678 * @see #findViewsWithText(ArrayList, CharSequence, int) 2679 */ 2680 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2681 2682 /** 2683 * Find views that contain {@link AccessibilityNodeProvider}. Such 2684 * a View is a root of virtual view hierarchy and may contain the searched 2685 * text. If this flag is set Views with providers are automatically 2686 * added and it is a responsibility of the client to call the APIs of 2687 * the provider to determine whether the virtual tree rooted at this View 2688 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2689 * represeting the virtual views with this text. 2690 * 2691 * @see #findViewsWithText(ArrayList, CharSequence, int) 2692 * 2693 * @hide 2694 */ 2695 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2696 2697 /** 2698 * The undefined cursor position. 2699 * 2700 * @hide 2701 */ 2702 public static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1; 2703 2704 /** 2705 * Indicates that the screen has changed state and is now off. 2706 * 2707 * @see #onScreenStateChanged(int) 2708 */ 2709 public static final int SCREEN_STATE_OFF = 0x0; 2710 2711 /** 2712 * Indicates that the screen has changed state and is now on. 2713 * 2714 * @see #onScreenStateChanged(int) 2715 */ 2716 public static final int SCREEN_STATE_ON = 0x1; 2717 2718 /** 2719 * Controls the over-scroll mode for this view. 2720 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2721 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2722 * and {@link #OVER_SCROLL_NEVER}. 2723 */ 2724 private int mOverScrollMode; 2725 2726 /** 2727 * The parent this view is attached to. 2728 * {@hide} 2729 * 2730 * @see #getParent() 2731 */ 2732 protected ViewParent mParent; 2733 2734 /** 2735 * {@hide} 2736 */ 2737 AttachInfo mAttachInfo; 2738 2739 /** 2740 * {@hide} 2741 */ 2742 @ViewDebug.ExportedProperty(flagMapping = { 2743 @ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT, 2744 name = "FORCE_LAYOUT"), 2745 @ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED, 2746 name = "LAYOUT_REQUIRED"), 2747 @ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID, 2748 name = "DRAWING_CACHE_INVALID", outputIf = false), 2749 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true), 2750 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false), 2751 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2752 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY") 2753 }) 2754 int mPrivateFlags; 2755 int mPrivateFlags2; 2756 int mPrivateFlags3; 2757 2758 /** 2759 * This view's request for the visibility of the status bar. 2760 * @hide 2761 */ 2762 @ViewDebug.ExportedProperty(flagMapping = { 2763 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2764 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2765 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2766 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2767 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2768 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2769 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2770 equals = SYSTEM_UI_FLAG_VISIBLE, 2771 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2772 }) 2773 int mSystemUiVisibility; 2774 2775 /** 2776 * Reference count for transient state. 2777 * @see #setHasTransientState(boolean) 2778 */ 2779 int mTransientStateCount = 0; 2780 2781 /** 2782 * Count of how many windows this view has been attached to. 2783 */ 2784 int mWindowAttachCount; 2785 2786 /** 2787 * The layout parameters associated with this view and used by the parent 2788 * {@link android.view.ViewGroup} to determine how this view should be 2789 * laid out. 2790 * {@hide} 2791 */ 2792 protected ViewGroup.LayoutParams mLayoutParams; 2793 2794 /** 2795 * The view flags hold various views states. 2796 * {@hide} 2797 */ 2798 @ViewDebug.ExportedProperty 2799 int mViewFlags; 2800 2801 static class TransformationInfo { 2802 /** 2803 * The transform matrix for the View. This transform is calculated internally 2804 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2805 * is used by default. Do *not* use this variable directly; instead call 2806 * getMatrix(), which will automatically recalculate the matrix if necessary 2807 * to get the correct matrix based on the latest rotation and scale properties. 2808 */ 2809 private final Matrix mMatrix = new Matrix(); 2810 2811 /** 2812 * The transform matrix for the View. This transform is calculated internally 2813 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2814 * is used by default. Do *not* use this variable directly; instead call 2815 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2816 * to get the correct matrix based on the latest rotation and scale properties. 2817 */ 2818 private Matrix mInverseMatrix; 2819 2820 /** 2821 * An internal variable that tracks whether we need to recalculate the 2822 * transform matrix, based on whether the rotation or scaleX/Y properties 2823 * have changed since the matrix was last calculated. 2824 */ 2825 boolean mMatrixDirty = false; 2826 2827 /** 2828 * An internal variable that tracks whether we need to recalculate the 2829 * transform matrix, based on whether the rotation or scaleX/Y properties 2830 * have changed since the matrix was last calculated. 2831 */ 2832 private boolean mInverseMatrixDirty = true; 2833 2834 /** 2835 * A variable that tracks whether we need to recalculate the 2836 * transform matrix, based on whether the rotation or scaleX/Y properties 2837 * have changed since the matrix was last calculated. This variable 2838 * is only valid after a call to updateMatrix() or to a function that 2839 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2840 */ 2841 private boolean mMatrixIsIdentity = true; 2842 2843 /** 2844 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2845 */ 2846 private Camera mCamera = null; 2847 2848 /** 2849 * This matrix is used when computing the matrix for 3D rotations. 2850 */ 2851 private Matrix matrix3D = null; 2852 2853 /** 2854 * These prev values are used to recalculate a centered pivot point when necessary. The 2855 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2856 * set), so thes values are only used then as well. 2857 */ 2858 private int mPrevWidth = -1; 2859 private int mPrevHeight = -1; 2860 2861 /** 2862 * The degrees rotation around the vertical axis through the pivot point. 2863 */ 2864 @ViewDebug.ExportedProperty 2865 float mRotationY = 0f; 2866 2867 /** 2868 * The degrees rotation around the horizontal axis through the pivot point. 2869 */ 2870 @ViewDebug.ExportedProperty 2871 float mRotationX = 0f; 2872 2873 /** 2874 * The degrees rotation around the pivot point. 2875 */ 2876 @ViewDebug.ExportedProperty 2877 float mRotation = 0f; 2878 2879 /** 2880 * The amount of translation of the object away from its left property (post-layout). 2881 */ 2882 @ViewDebug.ExportedProperty 2883 float mTranslationX = 0f; 2884 2885 /** 2886 * The amount of translation of the object away from its top property (post-layout). 2887 */ 2888 @ViewDebug.ExportedProperty 2889 float mTranslationY = 0f; 2890 2891 /** 2892 * The amount of scale in the x direction around the pivot point. A 2893 * value of 1 means no scaling is applied. 2894 */ 2895 @ViewDebug.ExportedProperty 2896 float mScaleX = 1f; 2897 2898 /** 2899 * The amount of scale in the y direction around the pivot point. A 2900 * value of 1 means no scaling is applied. 2901 */ 2902 @ViewDebug.ExportedProperty 2903 float mScaleY = 1f; 2904 2905 /** 2906 * The x location of the point around which the view is rotated and scaled. 2907 */ 2908 @ViewDebug.ExportedProperty 2909 float mPivotX = 0f; 2910 2911 /** 2912 * The y location of the point around which the view is rotated and scaled. 2913 */ 2914 @ViewDebug.ExportedProperty 2915 float mPivotY = 0f; 2916 2917 /** 2918 * The opacity of the View. This is a value from 0 to 1, where 0 means 2919 * completely transparent and 1 means completely opaque. 2920 */ 2921 @ViewDebug.ExportedProperty 2922 float mAlpha = 1f; 2923 2924 /** 2925 * The opacity of the view as manipulated by the Fade transition. This is a hidden 2926 * property only used by transitions, which is composited with the other alpha 2927 * values to calculate the final visual alpha value. 2928 */ 2929 float mTransitionAlpha = 1f; 2930 } 2931 2932 TransformationInfo mTransformationInfo; 2933 2934 /** 2935 * Current clip bounds. to which all drawing of this view are constrained. 2936 */ 2937 private Rect mClipBounds = null; 2938 2939 private boolean mLastIsOpaque; 2940 2941 /** 2942 * Convenience value to check for float values that are close enough to zero to be considered 2943 * zero. 2944 */ 2945 private static final float NONZERO_EPSILON = .001f; 2946 2947 /** 2948 * The distance in pixels from the left edge of this view's parent 2949 * to the left edge of this view. 2950 * {@hide} 2951 */ 2952 @ViewDebug.ExportedProperty(category = "layout") 2953 protected int mLeft; 2954 /** 2955 * The distance in pixels from the left edge of this view's parent 2956 * to the right edge of this view. 2957 * {@hide} 2958 */ 2959 @ViewDebug.ExportedProperty(category = "layout") 2960 protected int mRight; 2961 /** 2962 * The distance in pixels from the top edge of this view's parent 2963 * to the top edge of this view. 2964 * {@hide} 2965 */ 2966 @ViewDebug.ExportedProperty(category = "layout") 2967 protected int mTop; 2968 /** 2969 * The distance in pixels from the top edge of this view's parent 2970 * to the bottom edge of this view. 2971 * {@hide} 2972 */ 2973 @ViewDebug.ExportedProperty(category = "layout") 2974 protected int mBottom; 2975 2976 /** 2977 * The offset, in pixels, by which the content of this view is scrolled 2978 * horizontally. 2979 * {@hide} 2980 */ 2981 @ViewDebug.ExportedProperty(category = "scrolling") 2982 protected int mScrollX; 2983 /** 2984 * The offset, in pixels, by which the content of this view is scrolled 2985 * vertically. 2986 * {@hide} 2987 */ 2988 @ViewDebug.ExportedProperty(category = "scrolling") 2989 protected int mScrollY; 2990 2991 /** 2992 * The left padding in pixels, that is the distance in pixels between the 2993 * left edge of this view and the left edge of its content. 2994 * {@hide} 2995 */ 2996 @ViewDebug.ExportedProperty(category = "padding") 2997 protected int mPaddingLeft = 0; 2998 /** 2999 * The right padding in pixels, that is the distance in pixels between the 3000 * right edge of this view and the right edge of its content. 3001 * {@hide} 3002 */ 3003 @ViewDebug.ExportedProperty(category = "padding") 3004 protected int mPaddingRight = 0; 3005 /** 3006 * The top padding in pixels, that is the distance in pixels between the 3007 * top edge of this view and the top edge of its content. 3008 * {@hide} 3009 */ 3010 @ViewDebug.ExportedProperty(category = "padding") 3011 protected int mPaddingTop; 3012 /** 3013 * The bottom padding in pixels, that is the distance in pixels between the 3014 * bottom edge of this view and the bottom edge of its content. 3015 * {@hide} 3016 */ 3017 @ViewDebug.ExportedProperty(category = "padding") 3018 protected int mPaddingBottom; 3019 3020 /** 3021 * The layout insets in pixels, that is the distance in pixels between the 3022 * visible edges of this view its bounds. 3023 */ 3024 private Insets mLayoutInsets; 3025 3026 /** 3027 * Briefly describes the view and is primarily used for accessibility support. 3028 */ 3029 private CharSequence mContentDescription; 3030 3031 /** 3032 * Specifies the id of a view for which this view serves as a label for 3033 * accessibility purposes. 3034 */ 3035 private int mLabelForId = View.NO_ID; 3036 3037 /** 3038 * Predicate for matching labeled view id with its label for 3039 * accessibility purposes. 3040 */ 3041 private MatchLabelForPredicate mMatchLabelForPredicate; 3042 3043 /** 3044 * Predicate for matching a view by its id. 3045 */ 3046 private MatchIdPredicate mMatchIdPredicate; 3047 3048 /** 3049 * Cache the paddingRight set by the user to append to the scrollbar's size. 3050 * 3051 * @hide 3052 */ 3053 @ViewDebug.ExportedProperty(category = "padding") 3054 protected int mUserPaddingRight; 3055 3056 /** 3057 * Cache the paddingBottom set by the user to append to the scrollbar's size. 3058 * 3059 * @hide 3060 */ 3061 @ViewDebug.ExportedProperty(category = "padding") 3062 protected int mUserPaddingBottom; 3063 3064 /** 3065 * Cache the paddingLeft set by the user to append to the scrollbar's size. 3066 * 3067 * @hide 3068 */ 3069 @ViewDebug.ExportedProperty(category = "padding") 3070 protected int mUserPaddingLeft; 3071 3072 /** 3073 * Cache the paddingStart set by the user to append to the scrollbar's size. 3074 * 3075 */ 3076 @ViewDebug.ExportedProperty(category = "padding") 3077 int mUserPaddingStart; 3078 3079 /** 3080 * Cache the paddingEnd set by the user to append to the scrollbar's size. 3081 * 3082 */ 3083 @ViewDebug.ExportedProperty(category = "padding") 3084 int mUserPaddingEnd; 3085 3086 /** 3087 * Cache initial left padding. 3088 * 3089 * @hide 3090 */ 3091 int mUserPaddingLeftInitial; 3092 3093 /** 3094 * Cache initial right padding. 3095 * 3096 * @hide 3097 */ 3098 int mUserPaddingRightInitial; 3099 3100 /** 3101 * Default undefined padding 3102 */ 3103 private static final int UNDEFINED_PADDING = Integer.MIN_VALUE; 3104 3105 private boolean mUseBackgroundPadding = false; 3106 3107 /** 3108 * @hide 3109 */ 3110 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 3111 /** 3112 * @hide 3113 */ 3114 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 3115 3116 private LongSparseLongArray mMeasureCache; 3117 3118 @ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_") 3119 private Drawable mBackground; 3120 3121 private int mBackgroundResource; 3122 private boolean mBackgroundSizeChanged; 3123 3124 static class ListenerInfo { 3125 /** 3126 * Listener used to dispatch focus change events. 3127 * This field should be made private, so it is hidden from the SDK. 3128 * {@hide} 3129 */ 3130 protected OnFocusChangeListener mOnFocusChangeListener; 3131 3132 /** 3133 * Listeners for layout change events. 3134 */ 3135 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 3136 3137 /** 3138 * Listeners for attach events. 3139 */ 3140 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 3141 3142 /** 3143 * Listener used to dispatch click events. 3144 * This field should be made private, so it is hidden from the SDK. 3145 * {@hide} 3146 */ 3147 public OnClickListener mOnClickListener; 3148 3149 /** 3150 * Listener used to dispatch long click events. 3151 * This field should be made private, so it is hidden from the SDK. 3152 * {@hide} 3153 */ 3154 protected OnLongClickListener mOnLongClickListener; 3155 3156 /** 3157 * Listener used to build the context menu. 3158 * This field should be made private, so it is hidden from the SDK. 3159 * {@hide} 3160 */ 3161 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 3162 3163 private OnKeyListener mOnKeyListener; 3164 3165 private OnTouchListener mOnTouchListener; 3166 3167 private OnHoverListener mOnHoverListener; 3168 3169 private OnGenericMotionListener mOnGenericMotionListener; 3170 3171 private OnDragListener mOnDragListener; 3172 3173 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 3174 } 3175 3176 ListenerInfo mListenerInfo; 3177 3178 /** 3179 * The application environment this view lives in. 3180 * This field should be made private, so it is hidden from the SDK. 3181 * {@hide} 3182 */ 3183 protected Context mContext; 3184 3185 private final Resources mResources; 3186 3187 private ScrollabilityCache mScrollCache; 3188 3189 private int[] mDrawableState = null; 3190 3191 /** 3192 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 3193 * the user may specify which view to go to next. 3194 */ 3195 private int mNextFocusLeftId = View.NO_ID; 3196 3197 /** 3198 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 3199 * the user may specify which view to go to next. 3200 */ 3201 private int mNextFocusRightId = View.NO_ID; 3202 3203 /** 3204 * When this view has focus and the next focus is {@link #FOCUS_UP}, 3205 * the user may specify which view to go to next. 3206 */ 3207 private int mNextFocusUpId = View.NO_ID; 3208 3209 /** 3210 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 3211 * the user may specify which view to go to next. 3212 */ 3213 private int mNextFocusDownId = View.NO_ID; 3214 3215 /** 3216 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 3217 * the user may specify which view to go to next. 3218 */ 3219 int mNextFocusForwardId = View.NO_ID; 3220 3221 private CheckForLongPress mPendingCheckForLongPress; 3222 private CheckForTap mPendingCheckForTap = null; 3223 private PerformClick mPerformClick; 3224 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 3225 3226 private UnsetPressedState mUnsetPressedState; 3227 3228 /** 3229 * Whether the long press's action has been invoked. The tap's action is invoked on the 3230 * up event while a long press is invoked as soon as the long press duration is reached, so 3231 * a long press could be performed before the tap is checked, in which case the tap's action 3232 * should not be invoked. 3233 */ 3234 private boolean mHasPerformedLongPress; 3235 3236 /** 3237 * The minimum height of the view. We'll try our best to have the height 3238 * of this view to at least this amount. 3239 */ 3240 @ViewDebug.ExportedProperty(category = "measurement") 3241 private int mMinHeight; 3242 3243 /** 3244 * The minimum width of the view. We'll try our best to have the width 3245 * of this view to at least this amount. 3246 */ 3247 @ViewDebug.ExportedProperty(category = "measurement") 3248 private int mMinWidth; 3249 3250 /** 3251 * The delegate to handle touch events that are physically in this view 3252 * but should be handled by another view. 3253 */ 3254 private TouchDelegate mTouchDelegate = null; 3255 3256 /** 3257 * Solid color to use as a background when creating the drawing cache. Enables 3258 * the cache to use 16 bit bitmaps instead of 32 bit. 3259 */ 3260 private int mDrawingCacheBackgroundColor = 0; 3261 3262 /** 3263 * Special tree observer used when mAttachInfo is null. 3264 */ 3265 private ViewTreeObserver mFloatingTreeObserver; 3266 3267 /** 3268 * Cache the touch slop from the context that created the view. 3269 */ 3270 private int mTouchSlop; 3271 3272 /** 3273 * Object that handles automatic animation of view properties. 3274 */ 3275 private ViewPropertyAnimator mAnimator = null; 3276 3277 /** 3278 * Flag indicating that a drag can cross window boundaries. When 3279 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 3280 * with this flag set, all visible applications will be able to participate 3281 * in the drag operation and receive the dragged content. 3282 * 3283 * @hide 3284 */ 3285 public static final int DRAG_FLAG_GLOBAL = 1; 3286 3287 /** 3288 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3289 */ 3290 private float mVerticalScrollFactor; 3291 3292 /** 3293 * Position of the vertical scroll bar. 3294 */ 3295 private int mVerticalScrollbarPosition; 3296 3297 /** 3298 * Position the scroll bar at the default position as determined by the system. 3299 */ 3300 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3301 3302 /** 3303 * Position the scroll bar along the left edge. 3304 */ 3305 public static final int SCROLLBAR_POSITION_LEFT = 1; 3306 3307 /** 3308 * Position the scroll bar along the right edge. 3309 */ 3310 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3311 3312 /** 3313 * Indicates that the view does not have a layer. 3314 * 3315 * @see #getLayerType() 3316 * @see #setLayerType(int, android.graphics.Paint) 3317 * @see #LAYER_TYPE_SOFTWARE 3318 * @see #LAYER_TYPE_HARDWARE 3319 */ 3320 public static final int LAYER_TYPE_NONE = 0; 3321 3322 /** 3323 * <p>Indicates that the view has a software layer. A software layer is backed 3324 * by a bitmap and causes the view to be rendered using Android's software 3325 * rendering pipeline, even if hardware acceleration is enabled.</p> 3326 * 3327 * <p>Software layers have various usages:</p> 3328 * <p>When the application is not using hardware acceleration, a software layer 3329 * is useful to apply a specific color filter and/or blending mode and/or 3330 * translucency to a view and all its children.</p> 3331 * <p>When the application is using hardware acceleration, a software layer 3332 * is useful to render drawing primitives not supported by the hardware 3333 * accelerated pipeline. It can also be used to cache a complex view tree 3334 * into a texture and reduce the complexity of drawing operations. For instance, 3335 * when animating a complex view tree with a translation, a software layer can 3336 * be used to render the view tree only once.</p> 3337 * <p>Software layers should be avoided when the affected view tree updates 3338 * often. Every update will require to re-render the software layer, which can 3339 * potentially be slow (particularly when hardware acceleration is turned on 3340 * since the layer will have to be uploaded into a hardware texture after every 3341 * update.)</p> 3342 * 3343 * @see #getLayerType() 3344 * @see #setLayerType(int, android.graphics.Paint) 3345 * @see #LAYER_TYPE_NONE 3346 * @see #LAYER_TYPE_HARDWARE 3347 */ 3348 public static final int LAYER_TYPE_SOFTWARE = 1; 3349 3350 /** 3351 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3352 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3353 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3354 * rendering pipeline, but only if hardware acceleration is turned on for the 3355 * view hierarchy. When hardware acceleration is turned off, hardware layers 3356 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3357 * 3358 * <p>A hardware layer is useful to apply a specific color filter and/or 3359 * blending mode and/or translucency to a view and all its children.</p> 3360 * <p>A hardware layer can be used to cache a complex view tree into a 3361 * texture and reduce the complexity of drawing operations. For instance, 3362 * when animating a complex view tree with a translation, a hardware layer can 3363 * be used to render the view tree only once.</p> 3364 * <p>A hardware layer can also be used to increase the rendering quality when 3365 * rotation transformations are applied on a view. It can also be used to 3366 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3367 * 3368 * @see #getLayerType() 3369 * @see #setLayerType(int, android.graphics.Paint) 3370 * @see #LAYER_TYPE_NONE 3371 * @see #LAYER_TYPE_SOFTWARE 3372 */ 3373 public static final int LAYER_TYPE_HARDWARE = 2; 3374 3375 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3376 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3377 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3378 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3379 }) 3380 int mLayerType = LAYER_TYPE_NONE; 3381 Paint mLayerPaint; 3382 Rect mLocalDirtyRect; 3383 private HardwareLayer mHardwareLayer; 3384 3385 /** 3386 * Set to true when drawing cache is enabled and cannot be created. 3387 * 3388 * @hide 3389 */ 3390 public boolean mCachingFailed; 3391 private Bitmap mDrawingCache; 3392 private Bitmap mUnscaledDrawingCache; 3393 3394 DisplayList mDisplayList; 3395 3396 /** 3397 * Set to true when the view is sending hover accessibility events because it 3398 * is the innermost hovered view. 3399 */ 3400 private boolean mSendingHoverAccessibilityEvents; 3401 3402 /** 3403 * Delegate for injecting accessibility functionality. 3404 */ 3405 AccessibilityDelegate mAccessibilityDelegate; 3406 3407 /** 3408 * The view's overlay layer. Developers get a reference to the overlay via getOverlay() 3409 * and add/remove objects to/from the overlay directly through the Overlay methods. 3410 */ 3411 ViewOverlay mOverlay; 3412 3413 /** 3414 * Consistency verifier for debugging purposes. 3415 * @hide 3416 */ 3417 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3418 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3419 new InputEventConsistencyVerifier(this, 0) : null; 3420 3421 private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); 3422 3423 /** 3424 * Simple constructor to use when creating a view from code. 3425 * 3426 * @param context The Context the view is running in, through which it can 3427 * access the current theme, resources, etc. 3428 */ 3429 public View(Context context) { 3430 mContext = context; 3431 mResources = context != null ? context.getResources() : null; 3432 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3433 // Set some flags defaults 3434 mPrivateFlags2 = 3435 (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) | 3436 (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) | 3437 (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) | 3438 (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) | 3439 (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) | 3440 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3441 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3442 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3443 mUserPaddingStart = UNDEFINED_PADDING; 3444 mUserPaddingEnd = UNDEFINED_PADDING; 3445 3446 if (!sCompatibilityDone && context != null) { 3447 final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; 3448 3449 // Older apps may need this compatibility hack for measurement. 3450 sUseBrokenMakeMeasureSpec = targetSdkVersion <= JELLY_BEAN_MR1; 3451 3452 // Older apps expect onMeasure() to always be called on a layout pass, regardless 3453 // of whether a layout was requested on that View. 3454 sIgnoreMeasureCache = targetSdkVersion < KITKAT; 3455 3456 sCompatibilityDone = true; 3457 } 3458 } 3459 3460 /** 3461 * Constructor that is called when inflating a view from XML. This is called 3462 * when a view is being constructed from an XML file, supplying attributes 3463 * that were specified in the XML file. This version uses a default style of 3464 * 0, so the only attribute values applied are those in the Context's Theme 3465 * and the given AttributeSet. 3466 * 3467 * <p> 3468 * The method onFinishInflate() will be called after all children have been 3469 * added. 3470 * 3471 * @param context The Context the view is running in, through which it can 3472 * access the current theme, resources, etc. 3473 * @param attrs The attributes of the XML tag that is inflating the view. 3474 * @see #View(Context, AttributeSet, int) 3475 */ 3476 public View(Context context, AttributeSet attrs) { 3477 this(context, attrs, 0); 3478 } 3479 3480 /** 3481 * Perform inflation from XML and apply a class-specific base style. This 3482 * constructor of View allows subclasses to use their own base style when 3483 * they are inflating. For example, a Button class's constructor would call 3484 * this version of the super class constructor and supply 3485 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3486 * the theme's button style to modify all of the base view attributes (in 3487 * particular its background) as well as the Button class's attributes. 3488 * 3489 * @param context The Context the view is running in, through which it can 3490 * access the current theme, resources, etc. 3491 * @param attrs The attributes of the XML tag that is inflating the view. 3492 * @param defStyleAttr An attribute in the current theme that contains a 3493 * reference to a style resource to apply to this view. If 0, no 3494 * default style will be applied. 3495 * @see #View(Context, AttributeSet) 3496 */ 3497 public View(Context context, AttributeSet attrs, int defStyleAttr) { 3498 this(context); 3499 3500 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3501 defStyleAttr, 0); 3502 3503 Drawable background = null; 3504 3505 int leftPadding = -1; 3506 int topPadding = -1; 3507 int rightPadding = -1; 3508 int bottomPadding = -1; 3509 int startPadding = UNDEFINED_PADDING; 3510 int endPadding = UNDEFINED_PADDING; 3511 3512 int padding = -1; 3513 3514 int viewFlagValues = 0; 3515 int viewFlagMasks = 0; 3516 3517 boolean setScrollContainer = false; 3518 3519 int x = 0; 3520 int y = 0; 3521 3522 float tx = 0; 3523 float ty = 0; 3524 float rotation = 0; 3525 float rotationX = 0; 3526 float rotationY = 0; 3527 float sx = 1f; 3528 float sy = 1f; 3529 boolean transformSet = false; 3530 3531 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3532 int overScrollMode = mOverScrollMode; 3533 boolean initializeScrollbars = false; 3534 3535 boolean leftPaddingDefined = false; 3536 boolean rightPaddingDefined = false; 3537 boolean startPaddingDefined = false; 3538 boolean endPaddingDefined = false; 3539 3540 final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; 3541 3542 final int N = a.getIndexCount(); 3543 for (int i = 0; i < N; i++) { 3544 int attr = a.getIndex(i); 3545 switch (attr) { 3546 case com.android.internal.R.styleable.View_background: 3547 background = a.getDrawable(attr); 3548 break; 3549 case com.android.internal.R.styleable.View_padding: 3550 padding = a.getDimensionPixelSize(attr, -1); 3551 mUserPaddingLeftInitial = padding; 3552 mUserPaddingRightInitial = padding; 3553 leftPaddingDefined = true; 3554 rightPaddingDefined = true; 3555 break; 3556 case com.android.internal.R.styleable.View_paddingLeft: 3557 leftPadding = a.getDimensionPixelSize(attr, -1); 3558 mUserPaddingLeftInitial = leftPadding; 3559 leftPaddingDefined = true; 3560 break; 3561 case com.android.internal.R.styleable.View_paddingTop: 3562 topPadding = a.getDimensionPixelSize(attr, -1); 3563 break; 3564 case com.android.internal.R.styleable.View_paddingRight: 3565 rightPadding = a.getDimensionPixelSize(attr, -1); 3566 mUserPaddingRightInitial = rightPadding; 3567 rightPaddingDefined = true; 3568 break; 3569 case com.android.internal.R.styleable.View_paddingBottom: 3570 bottomPadding = a.getDimensionPixelSize(attr, -1); 3571 break; 3572 case com.android.internal.R.styleable.View_paddingStart: 3573 startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3574 startPaddingDefined = (startPadding != UNDEFINED_PADDING); 3575 break; 3576 case com.android.internal.R.styleable.View_paddingEnd: 3577 endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3578 endPaddingDefined = (endPadding != UNDEFINED_PADDING); 3579 break; 3580 case com.android.internal.R.styleable.View_scrollX: 3581 x = a.getDimensionPixelOffset(attr, 0); 3582 break; 3583 case com.android.internal.R.styleable.View_scrollY: 3584 y = a.getDimensionPixelOffset(attr, 0); 3585 break; 3586 case com.android.internal.R.styleable.View_alpha: 3587 setAlpha(a.getFloat(attr, 1f)); 3588 break; 3589 case com.android.internal.R.styleable.View_transformPivotX: 3590 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3591 break; 3592 case com.android.internal.R.styleable.View_transformPivotY: 3593 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3594 break; 3595 case com.android.internal.R.styleable.View_translationX: 3596 tx = a.getDimensionPixelOffset(attr, 0); 3597 transformSet = true; 3598 break; 3599 case com.android.internal.R.styleable.View_translationY: 3600 ty = a.getDimensionPixelOffset(attr, 0); 3601 transformSet = true; 3602 break; 3603 case com.android.internal.R.styleable.View_rotation: 3604 rotation = a.getFloat(attr, 0); 3605 transformSet = true; 3606 break; 3607 case com.android.internal.R.styleable.View_rotationX: 3608 rotationX = a.getFloat(attr, 0); 3609 transformSet = true; 3610 break; 3611 case com.android.internal.R.styleable.View_rotationY: 3612 rotationY = a.getFloat(attr, 0); 3613 transformSet = true; 3614 break; 3615 case com.android.internal.R.styleable.View_scaleX: 3616 sx = a.getFloat(attr, 1f); 3617 transformSet = true; 3618 break; 3619 case com.android.internal.R.styleable.View_scaleY: 3620 sy = a.getFloat(attr, 1f); 3621 transformSet = true; 3622 break; 3623 case com.android.internal.R.styleable.View_id: 3624 mID = a.getResourceId(attr, NO_ID); 3625 break; 3626 case com.android.internal.R.styleable.View_tag: 3627 mTag = a.getText(attr); 3628 break; 3629 case com.android.internal.R.styleable.View_fitsSystemWindows: 3630 if (a.getBoolean(attr, false)) { 3631 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3632 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3633 } 3634 break; 3635 case com.android.internal.R.styleable.View_focusable: 3636 if (a.getBoolean(attr, false)) { 3637 viewFlagValues |= FOCUSABLE; 3638 viewFlagMasks |= FOCUSABLE_MASK; 3639 } 3640 break; 3641 case com.android.internal.R.styleable.View_focusableInTouchMode: 3642 if (a.getBoolean(attr, false)) { 3643 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3644 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3645 } 3646 break; 3647 case com.android.internal.R.styleable.View_clickable: 3648 if (a.getBoolean(attr, false)) { 3649 viewFlagValues |= CLICKABLE; 3650 viewFlagMasks |= CLICKABLE; 3651 } 3652 break; 3653 case com.android.internal.R.styleable.View_longClickable: 3654 if (a.getBoolean(attr, false)) { 3655 viewFlagValues |= LONG_CLICKABLE; 3656 viewFlagMasks |= LONG_CLICKABLE; 3657 } 3658 break; 3659 case com.android.internal.R.styleable.View_saveEnabled: 3660 if (!a.getBoolean(attr, true)) { 3661 viewFlagValues |= SAVE_DISABLED; 3662 viewFlagMasks |= SAVE_DISABLED_MASK; 3663 } 3664 break; 3665 case com.android.internal.R.styleable.View_duplicateParentState: 3666 if (a.getBoolean(attr, false)) { 3667 viewFlagValues |= DUPLICATE_PARENT_STATE; 3668 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3669 } 3670 break; 3671 case com.android.internal.R.styleable.View_visibility: 3672 final int visibility = a.getInt(attr, 0); 3673 if (visibility != 0) { 3674 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3675 viewFlagMasks |= VISIBILITY_MASK; 3676 } 3677 break; 3678 case com.android.internal.R.styleable.View_layoutDirection: 3679 // Clear any layout direction flags (included resolved bits) already set 3680 mPrivateFlags2 &= 3681 ~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK); 3682 // Set the layout direction flags depending on the value of the attribute 3683 final int layoutDirection = a.getInt(attr, -1); 3684 final int value = (layoutDirection != -1) ? 3685 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3686 mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT); 3687 break; 3688 case com.android.internal.R.styleable.View_drawingCacheQuality: 3689 final int cacheQuality = a.getInt(attr, 0); 3690 if (cacheQuality != 0) { 3691 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3692 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3693 } 3694 break; 3695 case com.android.internal.R.styleable.View_contentDescription: 3696 setContentDescription(a.getString(attr)); 3697 break; 3698 case com.android.internal.R.styleable.View_labelFor: 3699 setLabelFor(a.getResourceId(attr, NO_ID)); 3700 break; 3701 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3702 if (!a.getBoolean(attr, true)) { 3703 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3704 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3705 } 3706 break; 3707 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3708 if (!a.getBoolean(attr, true)) { 3709 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3710 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3711 } 3712 break; 3713 case R.styleable.View_scrollbars: 3714 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3715 if (scrollbars != SCROLLBARS_NONE) { 3716 viewFlagValues |= scrollbars; 3717 viewFlagMasks |= SCROLLBARS_MASK; 3718 initializeScrollbars = true; 3719 } 3720 break; 3721 //noinspection deprecation 3722 case R.styleable.View_fadingEdge: 3723 if (targetSdkVersion >= ICE_CREAM_SANDWICH) { 3724 // Ignore the attribute starting with ICS 3725 break; 3726 } 3727 // With builds < ICS, fall through and apply fading edges 3728 case R.styleable.View_requiresFadingEdge: 3729 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3730 if (fadingEdge != FADING_EDGE_NONE) { 3731 viewFlagValues |= fadingEdge; 3732 viewFlagMasks |= FADING_EDGE_MASK; 3733 initializeFadingEdge(a); 3734 } 3735 break; 3736 case R.styleable.View_scrollbarStyle: 3737 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3738 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3739 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3740 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3741 } 3742 break; 3743 case R.styleable.View_isScrollContainer: 3744 setScrollContainer = true; 3745 if (a.getBoolean(attr, false)) { 3746 setScrollContainer(true); 3747 } 3748 break; 3749 case com.android.internal.R.styleable.View_keepScreenOn: 3750 if (a.getBoolean(attr, false)) { 3751 viewFlagValues |= KEEP_SCREEN_ON; 3752 viewFlagMasks |= KEEP_SCREEN_ON; 3753 } 3754 break; 3755 case R.styleable.View_filterTouchesWhenObscured: 3756 if (a.getBoolean(attr, false)) { 3757 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3758 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3759 } 3760 break; 3761 case R.styleable.View_nextFocusLeft: 3762 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3763 break; 3764 case R.styleable.View_nextFocusRight: 3765 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3766 break; 3767 case R.styleable.View_nextFocusUp: 3768 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3769 break; 3770 case R.styleable.View_nextFocusDown: 3771 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3772 break; 3773 case R.styleable.View_nextFocusForward: 3774 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3775 break; 3776 case R.styleable.View_minWidth: 3777 mMinWidth = a.getDimensionPixelSize(attr, 0); 3778 break; 3779 case R.styleable.View_minHeight: 3780 mMinHeight = a.getDimensionPixelSize(attr, 0); 3781 break; 3782 case R.styleable.View_onClick: 3783 if (context.isRestricted()) { 3784 throw new IllegalStateException("The android:onClick attribute cannot " 3785 + "be used within a restricted context"); 3786 } 3787 3788 final String handlerName = a.getString(attr); 3789 if (handlerName != null) { 3790 setOnClickListener(new OnClickListener() { 3791 private Method mHandler; 3792 3793 public void onClick(View v) { 3794 if (mHandler == null) { 3795 try { 3796 mHandler = getContext().getClass().getMethod(handlerName, 3797 View.class); 3798 } catch (NoSuchMethodException e) { 3799 int id = getId(); 3800 String idText = id == NO_ID ? "" : " with id '" 3801 + getContext().getResources().getResourceEntryName( 3802 id) + "'"; 3803 throw new IllegalStateException("Could not find a method " + 3804 handlerName + "(View) in the activity " 3805 + getContext().getClass() + " for onClick handler" 3806 + " on view " + View.this.getClass() + idText, e); 3807 } 3808 } 3809 3810 try { 3811 mHandler.invoke(getContext(), View.this); 3812 } catch (IllegalAccessException e) { 3813 throw new IllegalStateException("Could not execute non " 3814 + "public method of the activity", e); 3815 } catch (InvocationTargetException e) { 3816 throw new IllegalStateException("Could not execute " 3817 + "method of the activity", e); 3818 } 3819 } 3820 }); 3821 } 3822 break; 3823 case R.styleable.View_overScrollMode: 3824 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3825 break; 3826 case R.styleable.View_verticalScrollbarPosition: 3827 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3828 break; 3829 case R.styleable.View_layerType: 3830 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3831 break; 3832 case R.styleable.View_textDirection: 3833 // Clear any text direction flag already set 3834 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 3835 // Set the text direction flags depending on the value of the attribute 3836 final int textDirection = a.getInt(attr, -1); 3837 if (textDirection != -1) { 3838 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection]; 3839 } 3840 break; 3841 case R.styleable.View_textAlignment: 3842 // Clear any text alignment flag already set 3843 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 3844 // Set the text alignment flag depending on the value of the attribute 3845 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3846 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment]; 3847 break; 3848 case R.styleable.View_importantForAccessibility: 3849 setImportantForAccessibility(a.getInt(attr, 3850 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3851 break; 3852 case R.styleable.View_accessibilityLiveRegion: 3853 setAccessibilityLiveRegion(a.getInt(attr, ACCESSIBILITY_LIVE_REGION_DEFAULT)); 3854 break; 3855 } 3856 } 3857 3858 setOverScrollMode(overScrollMode); 3859 3860 // Cache start/end user padding as we cannot fully resolve padding here (we dont have yet 3861 // the resolved layout direction). Those cached values will be used later during padding 3862 // resolution. 3863 mUserPaddingStart = startPadding; 3864 mUserPaddingEnd = endPadding; 3865 3866 if (background != null) { 3867 setBackground(background); 3868 } 3869 3870 if (padding >= 0) { 3871 leftPadding = padding; 3872 topPadding = padding; 3873 rightPadding = padding; 3874 bottomPadding = padding; 3875 mUserPaddingLeftInitial = padding; 3876 mUserPaddingRightInitial = padding; 3877 } 3878 3879 if (isRtlCompatibilityMode()) { 3880 // RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case. 3881 // left / right padding are used if defined (meaning here nothing to do). If they are not 3882 // defined and start / end padding are defined (e.g. in Frameworks resources), then we use 3883 // start / end and resolve them as left / right (layout direction is not taken into account). 3884 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3885 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3886 // defined. 3887 if (!leftPaddingDefined && startPaddingDefined) { 3888 leftPadding = startPadding; 3889 } 3890 mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial; 3891 if (!rightPaddingDefined && endPaddingDefined) { 3892 rightPadding = endPadding; 3893 } 3894 mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial; 3895 } else { 3896 // Jelly Bean MR1 and after case: if start/end defined, they will override any left/right 3897 // values defined. Otherwise, left /right values are used. 3898 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3899 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3900 // defined. 3901 final boolean hasRelativePadding = startPaddingDefined || endPaddingDefined; 3902 3903 if (leftPaddingDefined && !hasRelativePadding) { 3904 mUserPaddingLeftInitial = leftPadding; 3905 } 3906 if (rightPaddingDefined && !hasRelativePadding) { 3907 mUserPaddingRightInitial = rightPadding; 3908 } 3909 } 3910 3911 internalSetPadding( 3912 mUserPaddingLeftInitial, 3913 topPadding >= 0 ? topPadding : mPaddingTop, 3914 mUserPaddingRightInitial, 3915 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3916 3917 if (viewFlagMasks != 0) { 3918 setFlags(viewFlagValues, viewFlagMasks); 3919 } 3920 3921 if (initializeScrollbars) { 3922 initializeScrollbars(a); 3923 } 3924 3925 a.recycle(); 3926 3927 // Needs to be called after mViewFlags is set 3928 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3929 recomputePadding(); 3930 } 3931 3932 if (x != 0 || y != 0) { 3933 scrollTo(x, y); 3934 } 3935 3936 if (transformSet) { 3937 setTranslationX(tx); 3938 setTranslationY(ty); 3939 setRotation(rotation); 3940 setRotationX(rotationX); 3941 setRotationY(rotationY); 3942 setScaleX(sx); 3943 setScaleY(sy); 3944 } 3945 3946 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3947 setScrollContainer(true); 3948 } 3949 3950 computeOpaqueFlags(); 3951 } 3952 3953 /** 3954 * Non-public constructor for use in testing 3955 */ 3956 View() { 3957 mResources = null; 3958 } 3959 3960 public String toString() { 3961 StringBuilder out = new StringBuilder(128); 3962 out.append(getClass().getName()); 3963 out.append('{'); 3964 out.append(Integer.toHexString(System.identityHashCode(this))); 3965 out.append(' '); 3966 switch (mViewFlags&VISIBILITY_MASK) { 3967 case VISIBLE: out.append('V'); break; 3968 case INVISIBLE: out.append('I'); break; 3969 case GONE: out.append('G'); break; 3970 default: out.append('.'); break; 3971 } 3972 out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.'); 3973 out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.'); 3974 out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D'); 3975 out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.'); 3976 out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.'); 3977 out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.'); 3978 out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.'); 3979 out.append(' '); 3980 out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.'); 3981 out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.'); 3982 out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.'); 3983 if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) { 3984 out.append('p'); 3985 } else { 3986 out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.'); 3987 } 3988 out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.'); 3989 out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.'); 3990 out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.'); 3991 out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.'); 3992 out.append(' '); 3993 out.append(mLeft); 3994 out.append(','); 3995 out.append(mTop); 3996 out.append('-'); 3997 out.append(mRight); 3998 out.append(','); 3999 out.append(mBottom); 4000 final int id = getId(); 4001 if (id != NO_ID) { 4002 out.append(" #"); 4003 out.append(Integer.toHexString(id)); 4004 final Resources r = mResources; 4005 if (id != 0 && r != null) { 4006 try { 4007 String pkgname; 4008 switch (id&0xff000000) { 4009 case 0x7f000000: 4010 pkgname="app"; 4011 break; 4012 case 0x01000000: 4013 pkgname="android"; 4014 break; 4015 default: 4016 pkgname = r.getResourcePackageName(id); 4017 break; 4018 } 4019 String typename = r.getResourceTypeName(id); 4020 String entryname = r.getResourceEntryName(id); 4021 out.append(" "); 4022 out.append(pkgname); 4023 out.append(":"); 4024 out.append(typename); 4025 out.append("/"); 4026 out.append(entryname); 4027 } catch (Resources.NotFoundException e) { 4028 } 4029 } 4030 } 4031 out.append("}"); 4032 return out.toString(); 4033 } 4034 4035 /** 4036 * <p> 4037 * Initializes the fading edges from a given set of styled attributes. This 4038 * method should be called by subclasses that need fading edges and when an 4039 * instance of these subclasses is created programmatically rather than 4040 * being inflated from XML. This method is automatically called when the XML 4041 * is inflated. 4042 * </p> 4043 * 4044 * @param a the styled attributes set to initialize the fading edges from 4045 */ 4046 protected void initializeFadingEdge(TypedArray a) { 4047 initScrollCache(); 4048 4049 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 4050 R.styleable.View_fadingEdgeLength, 4051 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 4052 } 4053 4054 /** 4055 * Returns the size of the vertical faded edges used to indicate that more 4056 * content in this view is visible. 4057 * 4058 * @return The size in pixels of the vertical faded edge or 0 if vertical 4059 * faded edges are not enabled for this view. 4060 * @attr ref android.R.styleable#View_fadingEdgeLength 4061 */ 4062 public int getVerticalFadingEdgeLength() { 4063 if (isVerticalFadingEdgeEnabled()) { 4064 ScrollabilityCache cache = mScrollCache; 4065 if (cache != null) { 4066 return cache.fadingEdgeLength; 4067 } 4068 } 4069 return 0; 4070 } 4071 4072 /** 4073 * Set the size of the faded edge used to indicate that more content in this 4074 * view is available. Will not change whether the fading edge is enabled; use 4075 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 4076 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 4077 * for the vertical or horizontal fading edges. 4078 * 4079 * @param length The size in pixels of the faded edge used to indicate that more 4080 * content in this view is visible. 4081 */ 4082 public void setFadingEdgeLength(int length) { 4083 initScrollCache(); 4084 mScrollCache.fadingEdgeLength = length; 4085 } 4086 4087 /** 4088 * Returns the size of the horizontal faded edges used to indicate that more 4089 * content in this view is visible. 4090 * 4091 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 4092 * faded edges are not enabled for this view. 4093 * @attr ref android.R.styleable#View_fadingEdgeLength 4094 */ 4095 public int getHorizontalFadingEdgeLength() { 4096 if (isHorizontalFadingEdgeEnabled()) { 4097 ScrollabilityCache cache = mScrollCache; 4098 if (cache != null) { 4099 return cache.fadingEdgeLength; 4100 } 4101 } 4102 return 0; 4103 } 4104 4105 /** 4106 * Returns the width of the vertical scrollbar. 4107 * 4108 * @return The width in pixels of the vertical scrollbar or 0 if there 4109 * is no vertical scrollbar. 4110 */ 4111 public int getVerticalScrollbarWidth() { 4112 ScrollabilityCache cache = mScrollCache; 4113 if (cache != null) { 4114 ScrollBarDrawable scrollBar = cache.scrollBar; 4115 if (scrollBar != null) { 4116 int size = scrollBar.getSize(true); 4117 if (size <= 0) { 4118 size = cache.scrollBarSize; 4119 } 4120 return size; 4121 } 4122 return 0; 4123 } 4124 return 0; 4125 } 4126 4127 /** 4128 * Returns the height of the horizontal scrollbar. 4129 * 4130 * @return The height in pixels of the horizontal scrollbar or 0 if 4131 * there is no horizontal scrollbar. 4132 */ 4133 protected int getHorizontalScrollbarHeight() { 4134 ScrollabilityCache cache = mScrollCache; 4135 if (cache != null) { 4136 ScrollBarDrawable scrollBar = cache.scrollBar; 4137 if (scrollBar != null) { 4138 int size = scrollBar.getSize(false); 4139 if (size <= 0) { 4140 size = cache.scrollBarSize; 4141 } 4142 return size; 4143 } 4144 return 0; 4145 } 4146 return 0; 4147 } 4148 4149 /** 4150 * <p> 4151 * Initializes the scrollbars from a given set of styled attributes. This 4152 * method should be called by subclasses that need scrollbars and when an 4153 * instance of these subclasses is created programmatically rather than 4154 * being inflated from XML. This method is automatically called when the XML 4155 * is inflated. 4156 * </p> 4157 * 4158 * @param a the styled attributes set to initialize the scrollbars from 4159 */ 4160 protected void initializeScrollbars(TypedArray a) { 4161 initScrollCache(); 4162 4163 final ScrollabilityCache scrollabilityCache = mScrollCache; 4164 4165 if (scrollabilityCache.scrollBar == null) { 4166 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 4167 } 4168 4169 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 4170 4171 if (!fadeScrollbars) { 4172 scrollabilityCache.state = ScrollabilityCache.ON; 4173 } 4174 scrollabilityCache.fadeScrollBars = fadeScrollbars; 4175 4176 4177 scrollabilityCache.scrollBarFadeDuration = a.getInt( 4178 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 4179 .getScrollBarFadeDuration()); 4180 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 4181 R.styleable.View_scrollbarDefaultDelayBeforeFade, 4182 ViewConfiguration.getScrollDefaultDelay()); 4183 4184 4185 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 4186 com.android.internal.R.styleable.View_scrollbarSize, 4187 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 4188 4189 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 4190 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 4191 4192 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 4193 if (thumb != null) { 4194 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 4195 } 4196 4197 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 4198 false); 4199 if (alwaysDraw) { 4200 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 4201 } 4202 4203 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 4204 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 4205 4206 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 4207 if (thumb != null) { 4208 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 4209 } 4210 4211 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 4212 false); 4213 if (alwaysDraw) { 4214 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 4215 } 4216 4217 // Apply layout direction to the new Drawables if needed 4218 final int layoutDirection = getLayoutDirection(); 4219 if (track != null) { 4220 track.setLayoutDirection(layoutDirection); 4221 } 4222 if (thumb != null) { 4223 thumb.setLayoutDirection(layoutDirection); 4224 } 4225 4226 // Re-apply user/background padding so that scrollbar(s) get added 4227 resolvePadding(); 4228 } 4229 4230 /** 4231 * <p> 4232 * Initalizes the scrollability cache if necessary. 4233 * </p> 4234 */ 4235 private void initScrollCache() { 4236 if (mScrollCache == null) { 4237 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 4238 } 4239 } 4240 4241 private ScrollabilityCache getScrollCache() { 4242 initScrollCache(); 4243 return mScrollCache; 4244 } 4245 4246 /** 4247 * Set the position of the vertical scroll bar. Should be one of 4248 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 4249 * {@link #SCROLLBAR_POSITION_RIGHT}. 4250 * 4251 * @param position Where the vertical scroll bar should be positioned. 4252 */ 4253 public void setVerticalScrollbarPosition(int position) { 4254 if (mVerticalScrollbarPosition != position) { 4255 mVerticalScrollbarPosition = position; 4256 computeOpaqueFlags(); 4257 resolvePadding(); 4258 } 4259 } 4260 4261 /** 4262 * @return The position where the vertical scroll bar will show, if applicable. 4263 * @see #setVerticalScrollbarPosition(int) 4264 */ 4265 public int getVerticalScrollbarPosition() { 4266 return mVerticalScrollbarPosition; 4267 } 4268 4269 ListenerInfo getListenerInfo() { 4270 if (mListenerInfo != null) { 4271 return mListenerInfo; 4272 } 4273 mListenerInfo = new ListenerInfo(); 4274 return mListenerInfo; 4275 } 4276 4277 /** 4278 * Register a callback to be invoked when focus of this view changed. 4279 * 4280 * @param l The callback that will run. 4281 */ 4282 public void setOnFocusChangeListener(OnFocusChangeListener l) { 4283 getListenerInfo().mOnFocusChangeListener = l; 4284 } 4285 4286 /** 4287 * Add a listener that will be called when the bounds of the view change due to 4288 * layout processing. 4289 * 4290 * @param listener The listener that will be called when layout bounds change. 4291 */ 4292 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 4293 ListenerInfo li = getListenerInfo(); 4294 if (li.mOnLayoutChangeListeners == null) { 4295 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 4296 } 4297 if (!li.mOnLayoutChangeListeners.contains(listener)) { 4298 li.mOnLayoutChangeListeners.add(listener); 4299 } 4300 } 4301 4302 /** 4303 * Remove a listener for layout changes. 4304 * 4305 * @param listener The listener for layout bounds change. 4306 */ 4307 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 4308 ListenerInfo li = mListenerInfo; 4309 if (li == null || li.mOnLayoutChangeListeners == null) { 4310 return; 4311 } 4312 li.mOnLayoutChangeListeners.remove(listener); 4313 } 4314 4315 /** 4316 * Add a listener for attach state changes. 4317 * 4318 * This listener will be called whenever this view is attached or detached 4319 * from a window. Remove the listener using 4320 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 4321 * 4322 * @param listener Listener to attach 4323 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 4324 */ 4325 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4326 ListenerInfo li = getListenerInfo(); 4327 if (li.mOnAttachStateChangeListeners == null) { 4328 li.mOnAttachStateChangeListeners 4329 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 4330 } 4331 li.mOnAttachStateChangeListeners.add(listener); 4332 } 4333 4334 /** 4335 * Remove a listener for attach state changes. The listener will receive no further 4336 * notification of window attach/detach events. 4337 * 4338 * @param listener Listener to remove 4339 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 4340 */ 4341 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4342 ListenerInfo li = mListenerInfo; 4343 if (li == null || li.mOnAttachStateChangeListeners == null) { 4344 return; 4345 } 4346 li.mOnAttachStateChangeListeners.remove(listener); 4347 } 4348 4349 /** 4350 * Returns the focus-change callback registered for this view. 4351 * 4352 * @return The callback, or null if one is not registered. 4353 */ 4354 public OnFocusChangeListener getOnFocusChangeListener() { 4355 ListenerInfo li = mListenerInfo; 4356 return li != null ? li.mOnFocusChangeListener : null; 4357 } 4358 4359 /** 4360 * Register a callback to be invoked when this view is clicked. If this view is not 4361 * clickable, it becomes clickable. 4362 * 4363 * @param l The callback that will run 4364 * 4365 * @see #setClickable(boolean) 4366 */ 4367 public void setOnClickListener(OnClickListener l) { 4368 if (!isClickable()) { 4369 setClickable(true); 4370 } 4371 getListenerInfo().mOnClickListener = l; 4372 } 4373 4374 /** 4375 * Return whether this view has an attached OnClickListener. Returns 4376 * true if there is a listener, false if there is none. 4377 */ 4378 public boolean hasOnClickListeners() { 4379 ListenerInfo li = mListenerInfo; 4380 return (li != null && li.mOnClickListener != null); 4381 } 4382 4383 /** 4384 * Register a callback to be invoked when this view is clicked and held. If this view is not 4385 * long clickable, it becomes long clickable. 4386 * 4387 * @param l The callback that will run 4388 * 4389 * @see #setLongClickable(boolean) 4390 */ 4391 public void setOnLongClickListener(OnLongClickListener l) { 4392 if (!isLongClickable()) { 4393 setLongClickable(true); 4394 } 4395 getListenerInfo().mOnLongClickListener = l; 4396 } 4397 4398 /** 4399 * Register a callback to be invoked when the context menu for this view is 4400 * being built. If this view is not long clickable, it becomes long clickable. 4401 * 4402 * @param l The callback that will run 4403 * 4404 */ 4405 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 4406 if (!isLongClickable()) { 4407 setLongClickable(true); 4408 } 4409 getListenerInfo().mOnCreateContextMenuListener = l; 4410 } 4411 4412 /** 4413 * Call this view's OnClickListener, if it is defined. Performs all normal 4414 * actions associated with clicking: reporting accessibility event, playing 4415 * a sound, etc. 4416 * 4417 * @return True there was an assigned OnClickListener that was called, false 4418 * otherwise is returned. 4419 */ 4420 public boolean performClick() { 4421 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 4422 4423 ListenerInfo li = mListenerInfo; 4424 if (li != null && li.mOnClickListener != null) { 4425 playSoundEffect(SoundEffectConstants.CLICK); 4426 li.mOnClickListener.onClick(this); 4427 return true; 4428 } 4429 4430 return false; 4431 } 4432 4433 /** 4434 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 4435 * this only calls the listener, and does not do any associated clicking 4436 * actions like reporting an accessibility event. 4437 * 4438 * @return True there was an assigned OnClickListener that was called, false 4439 * otherwise is returned. 4440 */ 4441 public boolean callOnClick() { 4442 ListenerInfo li = mListenerInfo; 4443 if (li != null && li.mOnClickListener != null) { 4444 li.mOnClickListener.onClick(this); 4445 return true; 4446 } 4447 return false; 4448 } 4449 4450 /** 4451 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 4452 * OnLongClickListener did not consume the event. 4453 * 4454 * @return True if one of the above receivers consumed the event, false otherwise. 4455 */ 4456 public boolean performLongClick() { 4457 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4458 4459 boolean handled = false; 4460 ListenerInfo li = mListenerInfo; 4461 if (li != null && li.mOnLongClickListener != null) { 4462 handled = li.mOnLongClickListener.onLongClick(View.this); 4463 } 4464 if (!handled) { 4465 handled = showContextMenu(); 4466 } 4467 if (handled) { 4468 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4469 } 4470 return handled; 4471 } 4472 4473 /** 4474 * Performs button-related actions during a touch down event. 4475 * 4476 * @param event The event. 4477 * @return True if the down was consumed. 4478 * 4479 * @hide 4480 */ 4481 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4482 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4483 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4484 return true; 4485 } 4486 } 4487 return false; 4488 } 4489 4490 /** 4491 * Bring up the context menu for this view. 4492 * 4493 * @return Whether a context menu was displayed. 4494 */ 4495 public boolean showContextMenu() { 4496 return getParent().showContextMenuForChild(this); 4497 } 4498 4499 /** 4500 * Bring up the context menu for this view, referring to the item under the specified point. 4501 * 4502 * @param x The referenced x coordinate. 4503 * @param y The referenced y coordinate. 4504 * @param metaState The keyboard modifiers that were pressed. 4505 * @return Whether a context menu was displayed. 4506 * 4507 * @hide 4508 */ 4509 public boolean showContextMenu(float x, float y, int metaState) { 4510 return showContextMenu(); 4511 } 4512 4513 /** 4514 * Start an action mode. 4515 * 4516 * @param callback Callback that will control the lifecycle of the action mode 4517 * @return The new action mode if it is started, null otherwise 4518 * 4519 * @see ActionMode 4520 */ 4521 public ActionMode startActionMode(ActionMode.Callback callback) { 4522 ViewParent parent = getParent(); 4523 if (parent == null) return null; 4524 return parent.startActionModeForChild(this, callback); 4525 } 4526 4527 /** 4528 * Register a callback to be invoked when a hardware key is pressed in this view. 4529 * Key presses in software input methods will generally not trigger the methods of 4530 * this listener. 4531 * @param l the key listener to attach to this view 4532 */ 4533 public void setOnKeyListener(OnKeyListener l) { 4534 getListenerInfo().mOnKeyListener = l; 4535 } 4536 4537 /** 4538 * Register a callback to be invoked when a touch event is sent to this view. 4539 * @param l the touch listener to attach to this view 4540 */ 4541 public void setOnTouchListener(OnTouchListener l) { 4542 getListenerInfo().mOnTouchListener = l; 4543 } 4544 4545 /** 4546 * Register a callback to be invoked when a generic motion event is sent to this view. 4547 * @param l the generic motion listener to attach to this view 4548 */ 4549 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4550 getListenerInfo().mOnGenericMotionListener = l; 4551 } 4552 4553 /** 4554 * Register a callback to be invoked when a hover event is sent to this view. 4555 * @param l the hover listener to attach to this view 4556 */ 4557 public void setOnHoverListener(OnHoverListener l) { 4558 getListenerInfo().mOnHoverListener = l; 4559 } 4560 4561 /** 4562 * Register a drag event listener callback object for this View. The parameter is 4563 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4564 * View, the system calls the 4565 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4566 * @param l An implementation of {@link android.view.View.OnDragListener}. 4567 */ 4568 public void setOnDragListener(OnDragListener l) { 4569 getListenerInfo().mOnDragListener = l; 4570 } 4571 4572 /** 4573 * Give this view focus. This will cause 4574 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4575 * 4576 * Note: this does not check whether this {@link View} should get focus, it just 4577 * gives it focus no matter what. It should only be called internally by framework 4578 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4579 * 4580 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4581 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4582 * focus moved when requestFocus() is called. It may not always 4583 * apply, in which case use the default View.FOCUS_DOWN. 4584 * @param previouslyFocusedRect The rectangle of the view that had focus 4585 * prior in this View's coordinate system. 4586 */ 4587 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4588 if (DBG) { 4589 System.out.println(this + " requestFocus()"); 4590 } 4591 4592 if ((mPrivateFlags & PFLAG_FOCUSED) == 0) { 4593 mPrivateFlags |= PFLAG_FOCUSED; 4594 4595 View oldFocus = (mAttachInfo != null) ? getRootView().findFocus() : null; 4596 4597 if (mParent != null) { 4598 mParent.requestChildFocus(this, this); 4599 } 4600 4601 if (mAttachInfo != null) { 4602 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, this); 4603 } 4604 4605 onFocusChanged(true, direction, previouslyFocusedRect); 4606 refreshDrawableState(); 4607 } 4608 } 4609 4610 /** 4611 * Request that a rectangle of this view be visible on the screen, 4612 * scrolling if necessary just enough. 4613 * 4614 * <p>A View should call this if it maintains some notion of which part 4615 * of its content is interesting. For example, a text editing view 4616 * should call this when its cursor moves. 4617 * 4618 * @param rectangle The rectangle. 4619 * @return Whether any parent scrolled. 4620 */ 4621 public boolean requestRectangleOnScreen(Rect rectangle) { 4622 return requestRectangleOnScreen(rectangle, false); 4623 } 4624 4625 /** 4626 * Request that a rectangle of this view be visible on the screen, 4627 * scrolling if necessary just enough. 4628 * 4629 * <p>A View should call this if it maintains some notion of which part 4630 * of its content is interesting. For example, a text editing view 4631 * should call this when its cursor moves. 4632 * 4633 * <p>When <code>immediate</code> is set to true, scrolling will not be 4634 * animated. 4635 * 4636 * @param rectangle The rectangle. 4637 * @param immediate True to forbid animated scrolling, false otherwise 4638 * @return Whether any parent scrolled. 4639 */ 4640 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4641 if (mParent == null) { 4642 return false; 4643 } 4644 4645 View child = this; 4646 4647 RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF(); 4648 position.set(rectangle); 4649 4650 ViewParent parent = mParent; 4651 boolean scrolled = false; 4652 while (parent != null) { 4653 rectangle.set((int) position.left, (int) position.top, 4654 (int) position.right, (int) position.bottom); 4655 4656 scrolled |= parent.requestChildRectangleOnScreen(child, 4657 rectangle, immediate); 4658 4659 if (!child.hasIdentityMatrix()) { 4660 child.getMatrix().mapRect(position); 4661 } 4662 4663 position.offset(child.mLeft, child.mTop); 4664 4665 if (!(parent instanceof View)) { 4666 break; 4667 } 4668 4669 View parentView = (View) parent; 4670 4671 position.offset(-parentView.getScrollX(), -parentView.getScrollY()); 4672 4673 child = parentView; 4674 parent = child.getParent(); 4675 } 4676 4677 return scrolled; 4678 } 4679 4680 /** 4681 * Called when this view wants to give up focus. If focus is cleared 4682 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4683 * <p> 4684 * <strong>Note:</strong> When a View clears focus the framework is trying 4685 * to give focus to the first focusable View from the top. Hence, if this 4686 * View is the first from the top that can take focus, then all callbacks 4687 * related to clearing focus will be invoked after wich the framework will 4688 * give focus to this view. 4689 * </p> 4690 */ 4691 public void clearFocus() { 4692 if (DBG) { 4693 System.out.println(this + " clearFocus()"); 4694 } 4695 4696 clearFocusInternal(true, true); 4697 } 4698 4699 /** 4700 * Clears focus from the view, optionally propagating the change up through 4701 * the parent hierarchy and requesting that the root view place new focus. 4702 * 4703 * @param propagate whether to propagate the change up through the parent 4704 * hierarchy 4705 * @param refocus when propagate is true, specifies whether to request the 4706 * root view place new focus 4707 */ 4708 void clearFocusInternal(boolean propagate, boolean refocus) { 4709 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4710 mPrivateFlags &= ~PFLAG_FOCUSED; 4711 4712 if (propagate && mParent != null) { 4713 mParent.clearChildFocus(this); 4714 } 4715 4716 onFocusChanged(false, 0, null); 4717 4718 refreshDrawableState(); 4719 4720 if (propagate && (!refocus || !rootViewRequestFocus())) { 4721 notifyGlobalFocusCleared(this); 4722 } 4723 } 4724 } 4725 4726 void notifyGlobalFocusCleared(View oldFocus) { 4727 if (oldFocus != null && mAttachInfo != null) { 4728 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null); 4729 } 4730 } 4731 4732 boolean rootViewRequestFocus() { 4733 final View root = getRootView(); 4734 return root != null && root.requestFocus(); 4735 } 4736 4737 /** 4738 * Called internally by the view system when a new view is getting focus. 4739 * This is what clears the old focus. 4740 * <p> 4741 * <b>NOTE:</b> The parent view's focused child must be updated manually 4742 * after calling this method. Otherwise, the view hierarchy may be left in 4743 * an inconstent state. 4744 */ 4745 void unFocus() { 4746 if (DBG) { 4747 System.out.println(this + " unFocus()"); 4748 } 4749 4750 clearFocusInternal(false, false); 4751 } 4752 4753 /** 4754 * Returns true if this view has focus iteself, or is the ancestor of the 4755 * view that has focus. 4756 * 4757 * @return True if this view has or contains focus, false otherwise. 4758 */ 4759 @ViewDebug.ExportedProperty(category = "focus") 4760 public boolean hasFocus() { 4761 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 4762 } 4763 4764 /** 4765 * Returns true if this view is focusable or if it contains a reachable View 4766 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4767 * is a View whose parents do not block descendants focus. 4768 * 4769 * Only {@link #VISIBLE} views are considered focusable. 4770 * 4771 * @return True if the view is focusable or if the view contains a focusable 4772 * View, false otherwise. 4773 * 4774 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4775 */ 4776 public boolean hasFocusable() { 4777 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4778 } 4779 4780 /** 4781 * Called by the view system when the focus state of this view changes. 4782 * When the focus change event is caused by directional navigation, direction 4783 * and previouslyFocusedRect provide insight into where the focus is coming from. 4784 * When overriding, be sure to call up through to the super class so that 4785 * the standard focus handling will occur. 4786 * 4787 * @param gainFocus True if the View has focus; false otherwise. 4788 * @param direction The direction focus has moved when requestFocus() 4789 * is called to give this view focus. Values are 4790 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4791 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4792 * It may not always apply, in which case use the default. 4793 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4794 * system, of the previously focused view. If applicable, this will be 4795 * passed in as finer grained information about where the focus is coming 4796 * from (in addition to direction). Will be <code>null</code> otherwise. 4797 */ 4798 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4799 if (gainFocus) { 4800 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4801 } else { 4802 notifyViewAccessibilityStateChangedIfNeeded( 4803 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 4804 } 4805 4806 InputMethodManager imm = InputMethodManager.peekInstance(); 4807 if (!gainFocus) { 4808 if (isPressed()) { 4809 setPressed(false); 4810 } 4811 if (imm != null && mAttachInfo != null 4812 && mAttachInfo.mHasWindowFocus) { 4813 imm.focusOut(this); 4814 } 4815 onFocusLost(); 4816 } else if (imm != null && mAttachInfo != null 4817 && mAttachInfo.mHasWindowFocus) { 4818 imm.focusIn(this); 4819 } 4820 4821 invalidate(true); 4822 ListenerInfo li = mListenerInfo; 4823 if (li != null && li.mOnFocusChangeListener != null) { 4824 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4825 } 4826 4827 if (mAttachInfo != null) { 4828 mAttachInfo.mKeyDispatchState.reset(this); 4829 } 4830 } 4831 4832 /** 4833 * Sends an accessibility event of the given type. If accessibility is 4834 * not enabled this method has no effect. The default implementation calls 4835 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4836 * to populate information about the event source (this View), then calls 4837 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4838 * populate the text content of the event source including its descendants, 4839 * and last calls 4840 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4841 * on its parent to resuest sending of the event to interested parties. 4842 * <p> 4843 * If an {@link AccessibilityDelegate} has been specified via calling 4844 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4845 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4846 * responsible for handling this call. 4847 * </p> 4848 * 4849 * @param eventType The type of the event to send, as defined by several types from 4850 * {@link android.view.accessibility.AccessibilityEvent}, such as 4851 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4852 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4853 * 4854 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4855 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4856 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4857 * @see AccessibilityDelegate 4858 */ 4859 public void sendAccessibilityEvent(int eventType) { 4860 // Excluded views do not send accessibility events. 4861 if (!includeForAccessibility()) { 4862 return; 4863 } 4864 if (mAccessibilityDelegate != null) { 4865 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4866 } else { 4867 sendAccessibilityEventInternal(eventType); 4868 } 4869 } 4870 4871 /** 4872 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4873 * {@link AccessibilityEvent} to make an announcement which is related to some 4874 * sort of a context change for which none of the events representing UI transitions 4875 * is a good fit. For example, announcing a new page in a book. If accessibility 4876 * is not enabled this method does nothing. 4877 * 4878 * @param text The announcement text. 4879 */ 4880 public void announceForAccessibility(CharSequence text) { 4881 if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) { 4882 AccessibilityEvent event = AccessibilityEvent.obtain( 4883 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4884 onInitializeAccessibilityEvent(event); 4885 event.getText().add(text); 4886 event.setContentDescription(null); 4887 mParent.requestSendAccessibilityEvent(this, event); 4888 } 4889 } 4890 4891 /** 4892 * @see #sendAccessibilityEvent(int) 4893 * 4894 * Note: Called from the default {@link AccessibilityDelegate}. 4895 */ 4896 void sendAccessibilityEventInternal(int eventType) { 4897 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4898 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4899 } 4900 } 4901 4902 /** 4903 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4904 * takes as an argument an empty {@link AccessibilityEvent} and does not 4905 * perform a check whether accessibility is enabled. 4906 * <p> 4907 * If an {@link AccessibilityDelegate} has been specified via calling 4908 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4909 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4910 * is responsible for handling this call. 4911 * </p> 4912 * 4913 * @param event The event to send. 4914 * 4915 * @see #sendAccessibilityEvent(int) 4916 */ 4917 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4918 if (mAccessibilityDelegate != null) { 4919 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4920 } else { 4921 sendAccessibilityEventUncheckedInternal(event); 4922 } 4923 } 4924 4925 /** 4926 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4927 * 4928 * Note: Called from the default {@link AccessibilityDelegate}. 4929 */ 4930 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4931 if (!isShown()) { 4932 return; 4933 } 4934 onInitializeAccessibilityEvent(event); 4935 // Only a subset of accessibility events populates text content. 4936 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4937 dispatchPopulateAccessibilityEvent(event); 4938 } 4939 // In the beginning we called #isShown(), so we know that getParent() is not null. 4940 getParent().requestSendAccessibilityEvent(this, event); 4941 } 4942 4943 /** 4944 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4945 * to its children for adding their text content to the event. Note that the 4946 * event text is populated in a separate dispatch path since we add to the 4947 * event not only the text of the source but also the text of all its descendants. 4948 * A typical implementation will call 4949 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4950 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4951 * on each child. Override this method if custom population of the event text 4952 * content is required. 4953 * <p> 4954 * If an {@link AccessibilityDelegate} has been specified via calling 4955 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4956 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4957 * is responsible for handling this call. 4958 * </p> 4959 * <p> 4960 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4961 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4962 * </p> 4963 * 4964 * @param event The event. 4965 * 4966 * @return True if the event population was completed. 4967 */ 4968 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4969 if (mAccessibilityDelegate != null) { 4970 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4971 } else { 4972 return dispatchPopulateAccessibilityEventInternal(event); 4973 } 4974 } 4975 4976 /** 4977 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4978 * 4979 * Note: Called from the default {@link AccessibilityDelegate}. 4980 */ 4981 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4982 onPopulateAccessibilityEvent(event); 4983 return false; 4984 } 4985 4986 /** 4987 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4988 * giving a chance to this View to populate the accessibility event with its 4989 * text content. While this method is free to modify event 4990 * attributes other than text content, doing so should normally be performed in 4991 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4992 * <p> 4993 * Example: Adding formatted date string to an accessibility event in addition 4994 * to the text added by the super implementation: 4995 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4996 * super.onPopulateAccessibilityEvent(event); 4997 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4998 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4999 * mCurrentDate.getTimeInMillis(), flags); 5000 * event.getText().add(selectedDateUtterance); 5001 * }</pre> 5002 * <p> 5003 * If an {@link AccessibilityDelegate} has been specified via calling 5004 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5005 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 5006 * is responsible for handling this call. 5007 * </p> 5008 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 5009 * information to the event, in case the default implementation has basic information to add. 5010 * </p> 5011 * 5012 * @param event The accessibility event which to populate. 5013 * 5014 * @see #sendAccessibilityEvent(int) 5015 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 5016 */ 5017 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 5018 if (mAccessibilityDelegate != null) { 5019 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 5020 } else { 5021 onPopulateAccessibilityEventInternal(event); 5022 } 5023 } 5024 5025 /** 5026 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 5027 * 5028 * Note: Called from the default {@link AccessibilityDelegate}. 5029 */ 5030 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 5031 } 5032 5033 /** 5034 * Initializes an {@link AccessibilityEvent} with information about 5035 * this View which is the event source. In other words, the source of 5036 * an accessibility event is the view whose state change triggered firing 5037 * the event. 5038 * <p> 5039 * Example: Setting the password property of an event in addition 5040 * to properties set by the super implementation: 5041 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 5042 * super.onInitializeAccessibilityEvent(event); 5043 * event.setPassword(true); 5044 * }</pre> 5045 * <p> 5046 * If an {@link AccessibilityDelegate} has been specified via calling 5047 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5048 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 5049 * is responsible for handling this call. 5050 * </p> 5051 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 5052 * information to the event, in case the default implementation has basic information to add. 5053 * </p> 5054 * @param event The event to initialize. 5055 * 5056 * @see #sendAccessibilityEvent(int) 5057 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 5058 */ 5059 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 5060 if (mAccessibilityDelegate != null) { 5061 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 5062 } else { 5063 onInitializeAccessibilityEventInternal(event); 5064 } 5065 } 5066 5067 /** 5068 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 5069 * 5070 * Note: Called from the default {@link AccessibilityDelegate}. 5071 */ 5072 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 5073 event.setSource(this); 5074 event.setClassName(View.class.getName()); 5075 event.setPackageName(getContext().getPackageName()); 5076 event.setEnabled(isEnabled()); 5077 event.setContentDescription(mContentDescription); 5078 5079 switch (event.getEventType()) { 5080 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 5081 ArrayList<View> focusablesTempList = (mAttachInfo != null) 5082 ? mAttachInfo.mTempArrayList : new ArrayList<View>(); 5083 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 5084 event.setItemCount(focusablesTempList.size()); 5085 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 5086 if (mAttachInfo != null) { 5087 focusablesTempList.clear(); 5088 } 5089 } break; 5090 case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED: { 5091 CharSequence text = getIterableTextForAccessibility(); 5092 if (text != null && text.length() > 0) { 5093 event.setFromIndex(getAccessibilitySelectionStart()); 5094 event.setToIndex(getAccessibilitySelectionEnd()); 5095 event.setItemCount(text.length()); 5096 } 5097 } break; 5098 } 5099 } 5100 5101 /** 5102 * Returns an {@link AccessibilityNodeInfo} representing this view from the 5103 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 5104 * This method is responsible for obtaining an accessibility node info from a 5105 * pool of reusable instances and calling 5106 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 5107 * initialize the former. 5108 * <p> 5109 * Note: The client is responsible for recycling the obtained instance by calling 5110 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 5111 * </p> 5112 * 5113 * @return A populated {@link AccessibilityNodeInfo}. 5114 * 5115 * @see AccessibilityNodeInfo 5116 */ 5117 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 5118 if (mAccessibilityDelegate != null) { 5119 return mAccessibilityDelegate.createAccessibilityNodeInfo(this); 5120 } else { 5121 return createAccessibilityNodeInfoInternal(); 5122 } 5123 } 5124 5125 /** 5126 * @see #createAccessibilityNodeInfo() 5127 */ 5128 AccessibilityNodeInfo createAccessibilityNodeInfoInternal() { 5129 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 5130 if (provider != null) { 5131 return provider.createAccessibilityNodeInfo(View.NO_ID); 5132 } else { 5133 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 5134 onInitializeAccessibilityNodeInfo(info); 5135 return info; 5136 } 5137 } 5138 5139 /** 5140 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 5141 * The base implementation sets: 5142 * <ul> 5143 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 5144 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 5145 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 5146 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 5147 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 5148 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 5149 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 5150 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 5151 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 5152 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 5153 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 5154 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 5155 * </ul> 5156 * <p> 5157 * Subclasses should override this method, call the super implementation, 5158 * and set additional attributes. 5159 * </p> 5160 * <p> 5161 * If an {@link AccessibilityDelegate} has been specified via calling 5162 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5163 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 5164 * is responsible for handling this call. 5165 * </p> 5166 * 5167 * @param info The instance to initialize. 5168 */ 5169 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 5170 if (mAccessibilityDelegate != null) { 5171 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 5172 } else { 5173 onInitializeAccessibilityNodeInfoInternal(info); 5174 } 5175 } 5176 5177 /** 5178 * Gets the location of this view in screen coordintates. 5179 * 5180 * @param outRect The output location 5181 */ 5182 void getBoundsOnScreen(Rect outRect) { 5183 if (mAttachInfo == null) { 5184 return; 5185 } 5186 5187 RectF position = mAttachInfo.mTmpTransformRect; 5188 position.set(0, 0, mRight - mLeft, mBottom - mTop); 5189 5190 if (!hasIdentityMatrix()) { 5191 getMatrix().mapRect(position); 5192 } 5193 5194 position.offset(mLeft, mTop); 5195 5196 ViewParent parent = mParent; 5197 while (parent instanceof View) { 5198 View parentView = (View) parent; 5199 5200 position.offset(-parentView.mScrollX, -parentView.mScrollY); 5201 5202 if (!parentView.hasIdentityMatrix()) { 5203 parentView.getMatrix().mapRect(position); 5204 } 5205 5206 position.offset(parentView.mLeft, parentView.mTop); 5207 5208 parent = parentView.mParent; 5209 } 5210 5211 if (parent instanceof ViewRootImpl) { 5212 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 5213 position.offset(0, -viewRootImpl.mCurScrollY); 5214 } 5215 5216 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 5217 5218 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 5219 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 5220 } 5221 5222 /** 5223 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 5224 * 5225 * Note: Called from the default {@link AccessibilityDelegate}. 5226 */ 5227 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 5228 Rect bounds = mAttachInfo.mTmpInvalRect; 5229 5230 getDrawingRect(bounds); 5231 info.setBoundsInParent(bounds); 5232 5233 getBoundsOnScreen(bounds); 5234 info.setBoundsInScreen(bounds); 5235 5236 ViewParent parent = getParentForAccessibility(); 5237 if (parent instanceof View) { 5238 info.setParent((View) parent); 5239 } 5240 5241 if (mID != View.NO_ID) { 5242 View rootView = getRootView(); 5243 if (rootView == null) { 5244 rootView = this; 5245 } 5246 View label = rootView.findLabelForView(this, mID); 5247 if (label != null) { 5248 info.setLabeledBy(label); 5249 } 5250 5251 if ((mAttachInfo.mAccessibilityFetchFlags 5252 & AccessibilityNodeInfo.FLAG_REPORT_VIEW_IDS) != 0 5253 && Resources.resourceHasPackage(mID)) { 5254 try { 5255 String viewId = getResources().getResourceName(mID); 5256 info.setViewIdResourceName(viewId); 5257 } catch (Resources.NotFoundException nfe) { 5258 /* ignore */ 5259 } 5260 } 5261 } 5262 5263 if (mLabelForId != View.NO_ID) { 5264 View rootView = getRootView(); 5265 if (rootView == null) { 5266 rootView = this; 5267 } 5268 View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId); 5269 if (labeled != null) { 5270 info.setLabelFor(labeled); 5271 } 5272 } 5273 5274 info.setVisibleToUser(isVisibleToUser()); 5275 5276 info.setPackageName(mContext.getPackageName()); 5277 info.setClassName(View.class.getName()); 5278 info.setContentDescription(getContentDescription()); 5279 5280 info.setEnabled(isEnabled()); 5281 info.setClickable(isClickable()); 5282 info.setFocusable(isFocusable()); 5283 info.setFocused(isFocused()); 5284 info.setAccessibilityFocused(isAccessibilityFocused()); 5285 info.setSelected(isSelected()); 5286 info.setLongClickable(isLongClickable()); 5287 info.setLiveRegion(getAccessibilityLiveRegion()); 5288 5289 // TODO: These make sense only if we are in an AdapterView but all 5290 // views can be selected. Maybe from accessibility perspective 5291 // we should report as selectable view in an AdapterView. 5292 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 5293 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 5294 5295 if (isFocusable()) { 5296 if (isFocused()) { 5297 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 5298 } else { 5299 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 5300 } 5301 } 5302 5303 if (!isAccessibilityFocused()) { 5304 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 5305 } else { 5306 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 5307 } 5308 5309 if (isClickable() && isEnabled()) { 5310 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 5311 } 5312 5313 if (isLongClickable() && isEnabled()) { 5314 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 5315 } 5316 5317 CharSequence text = getIterableTextForAccessibility(); 5318 if (text != null && text.length() > 0) { 5319 info.setTextSelection(getAccessibilitySelectionStart(), getAccessibilitySelectionEnd()); 5320 5321 info.addAction(AccessibilityNodeInfo.ACTION_SET_SELECTION); 5322 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 5323 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 5324 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 5325 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 5326 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 5327 } 5328 } 5329 5330 private View findLabelForView(View view, int labeledId) { 5331 if (mMatchLabelForPredicate == null) { 5332 mMatchLabelForPredicate = new MatchLabelForPredicate(); 5333 } 5334 mMatchLabelForPredicate.mLabeledId = labeledId; 5335 return findViewByPredicateInsideOut(view, mMatchLabelForPredicate); 5336 } 5337 5338 /** 5339 * Computes whether this view is visible to the user. Such a view is 5340 * attached, visible, all its predecessors are visible, it is not clipped 5341 * entirely by its predecessors, and has an alpha greater than zero. 5342 * 5343 * @return Whether the view is visible on the screen. 5344 * 5345 * @hide 5346 */ 5347 protected boolean isVisibleToUser() { 5348 return isVisibleToUser(null); 5349 } 5350 5351 /** 5352 * Computes whether the given portion of this view is visible to the user. 5353 * Such a view is attached, visible, all its predecessors are visible, 5354 * has an alpha greater than zero, and the specified portion is not 5355 * clipped entirely by its predecessors. 5356 * 5357 * @param boundInView the portion of the view to test; coordinates should be relative; may be 5358 * <code>null</code>, and the entire view will be tested in this case. 5359 * When <code>true</code> is returned by the function, the actual visible 5360 * region will be stored in this parameter; that is, if boundInView is fully 5361 * contained within the view, no modification will be made, otherwise regions 5362 * outside of the visible area of the view will be clipped. 5363 * 5364 * @return Whether the specified portion of the view is visible on the screen. 5365 * 5366 * @hide 5367 */ 5368 protected boolean isVisibleToUser(Rect boundInView) { 5369 if (mAttachInfo != null) { 5370 // Attached to invisible window means this view is not visible. 5371 if (mAttachInfo.mWindowVisibility != View.VISIBLE) { 5372 return false; 5373 } 5374 // An invisible predecessor or one with alpha zero means 5375 // that this view is not visible to the user. 5376 Object current = this; 5377 while (current instanceof View) { 5378 View view = (View) current; 5379 // We have attach info so this view is attached and there is no 5380 // need to check whether we reach to ViewRootImpl on the way up. 5381 if (view.getAlpha() <= 0 || view.getTransitionAlpha() <= 0 || 5382 view.getVisibility() != VISIBLE) { 5383 return false; 5384 } 5385 current = view.mParent; 5386 } 5387 // Check if the view is entirely covered by its predecessors. 5388 Rect visibleRect = mAttachInfo.mTmpInvalRect; 5389 Point offset = mAttachInfo.mPoint; 5390 if (!getGlobalVisibleRect(visibleRect, offset)) { 5391 return false; 5392 } 5393 // Check if the visible portion intersects the rectangle of interest. 5394 if (boundInView != null) { 5395 visibleRect.offset(-offset.x, -offset.y); 5396 return boundInView.intersect(visibleRect); 5397 } 5398 return true; 5399 } 5400 return false; 5401 } 5402 5403 /** 5404 * Returns the delegate for implementing accessibility support via 5405 * composition. For more details see {@link AccessibilityDelegate}. 5406 * 5407 * @return The delegate, or null if none set. 5408 * 5409 * @hide 5410 */ 5411 public AccessibilityDelegate getAccessibilityDelegate() { 5412 return mAccessibilityDelegate; 5413 } 5414 5415 /** 5416 * Sets a delegate for implementing accessibility support via composition as 5417 * opposed to inheritance. The delegate's primary use is for implementing 5418 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 5419 * 5420 * @param delegate The delegate instance. 5421 * 5422 * @see AccessibilityDelegate 5423 */ 5424 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 5425 mAccessibilityDelegate = delegate; 5426 } 5427 5428 /** 5429 * Gets the provider for managing a virtual view hierarchy rooted at this View 5430 * and reported to {@link android.accessibilityservice.AccessibilityService}s 5431 * that explore the window content. 5432 * <p> 5433 * If this method returns an instance, this instance is responsible for managing 5434 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 5435 * View including the one representing the View itself. Similarly the returned 5436 * instance is responsible for performing accessibility actions on any virtual 5437 * view or the root view itself. 5438 * </p> 5439 * <p> 5440 * If an {@link AccessibilityDelegate} has been specified via calling 5441 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5442 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 5443 * is responsible for handling this call. 5444 * </p> 5445 * 5446 * @return The provider. 5447 * 5448 * @see AccessibilityNodeProvider 5449 */ 5450 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 5451 if (mAccessibilityDelegate != null) { 5452 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 5453 } else { 5454 return null; 5455 } 5456 } 5457 5458 /** 5459 * Gets the unique identifier of this view on the screen for accessibility purposes. 5460 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 5461 * 5462 * @return The view accessibility id. 5463 * 5464 * @hide 5465 */ 5466 public int getAccessibilityViewId() { 5467 if (mAccessibilityViewId == NO_ID) { 5468 mAccessibilityViewId = sNextAccessibilityViewId++; 5469 } 5470 return mAccessibilityViewId; 5471 } 5472 5473 /** 5474 * Gets the unique identifier of the window in which this View reseides. 5475 * 5476 * @return The window accessibility id. 5477 * 5478 * @hide 5479 */ 5480 public int getAccessibilityWindowId() { 5481 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 5482 } 5483 5484 /** 5485 * Gets the {@link View} description. It briefly describes the view and is 5486 * primarily used for accessibility support. Set this property to enable 5487 * better accessibility support for your application. This is especially 5488 * true for views that do not have textual representation (For example, 5489 * ImageButton). 5490 * 5491 * @return The content description. 5492 * 5493 * @attr ref android.R.styleable#View_contentDescription 5494 */ 5495 @ViewDebug.ExportedProperty(category = "accessibility") 5496 public CharSequence getContentDescription() { 5497 return mContentDescription; 5498 } 5499 5500 /** 5501 * Sets the {@link View} description. It briefly describes the view and is 5502 * primarily used for accessibility support. Set this property to enable 5503 * better accessibility support for your application. This is especially 5504 * true for views that do not have textual representation (For example, 5505 * ImageButton). 5506 * 5507 * @param contentDescription The content description. 5508 * 5509 * @attr ref android.R.styleable#View_contentDescription 5510 */ 5511 @RemotableViewMethod 5512 public void setContentDescription(CharSequence contentDescription) { 5513 if (mContentDescription == null) { 5514 if (contentDescription == null) { 5515 return; 5516 } 5517 } else if (mContentDescription.equals(contentDescription)) { 5518 return; 5519 } 5520 mContentDescription = contentDescription; 5521 final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; 5522 if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 5523 setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 5524 notifySubtreeAccessibilityStateChangedIfNeeded(); 5525 } else { 5526 notifyViewAccessibilityStateChangedIfNeeded( 5527 AccessibilityEvent.CONTENT_CHANGE_TYPE_CONTENT_DESCRIPTION); 5528 } 5529 } 5530 5531 /** 5532 * Gets the id of a view for which this view serves as a label for 5533 * accessibility purposes. 5534 * 5535 * @return The labeled view id. 5536 */ 5537 @ViewDebug.ExportedProperty(category = "accessibility") 5538 public int getLabelFor() { 5539 return mLabelForId; 5540 } 5541 5542 /** 5543 * Sets the id of a view for which this view serves as a label for 5544 * accessibility purposes. 5545 * 5546 * @param id The labeled view id. 5547 */ 5548 @RemotableViewMethod 5549 public void setLabelFor(int id) { 5550 mLabelForId = id; 5551 if (mLabelForId != View.NO_ID 5552 && mID == View.NO_ID) { 5553 mID = generateViewId(); 5554 } 5555 } 5556 5557 /** 5558 * Invoked whenever this view loses focus, either by losing window focus or by losing 5559 * focus within its window. This method can be used to clear any state tied to the 5560 * focus. For instance, if a button is held pressed with the trackball and the window 5561 * loses focus, this method can be used to cancel the press. 5562 * 5563 * Subclasses of View overriding this method should always call super.onFocusLost(). 5564 * 5565 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 5566 * @see #onWindowFocusChanged(boolean) 5567 * 5568 * @hide pending API council approval 5569 */ 5570 protected void onFocusLost() { 5571 resetPressedState(); 5572 } 5573 5574 private void resetPressedState() { 5575 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5576 return; 5577 } 5578 5579 if (isPressed()) { 5580 setPressed(false); 5581 5582 if (!mHasPerformedLongPress) { 5583 removeLongPressCallback(); 5584 } 5585 } 5586 } 5587 5588 /** 5589 * Returns true if this view has focus 5590 * 5591 * @return True if this view has focus, false otherwise. 5592 */ 5593 @ViewDebug.ExportedProperty(category = "focus") 5594 public boolean isFocused() { 5595 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 5596 } 5597 5598 /** 5599 * Find the view in the hierarchy rooted at this view that currently has 5600 * focus. 5601 * 5602 * @return The view that currently has focus, or null if no focused view can 5603 * be found. 5604 */ 5605 public View findFocus() { 5606 return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null; 5607 } 5608 5609 /** 5610 * Indicates whether this view is one of the set of scrollable containers in 5611 * its window. 5612 * 5613 * @return whether this view is one of the set of scrollable containers in 5614 * its window 5615 * 5616 * @attr ref android.R.styleable#View_isScrollContainer 5617 */ 5618 public boolean isScrollContainer() { 5619 return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0; 5620 } 5621 5622 /** 5623 * Change whether this view is one of the set of scrollable containers in 5624 * its window. This will be used to determine whether the window can 5625 * resize or must pan when a soft input area is open -- scrollable 5626 * containers allow the window to use resize mode since the container 5627 * will appropriately shrink. 5628 * 5629 * @attr ref android.R.styleable#View_isScrollContainer 5630 */ 5631 public void setScrollContainer(boolean isScrollContainer) { 5632 if (isScrollContainer) { 5633 if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) { 5634 mAttachInfo.mScrollContainers.add(this); 5635 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 5636 } 5637 mPrivateFlags |= PFLAG_SCROLL_CONTAINER; 5638 } else { 5639 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 5640 mAttachInfo.mScrollContainers.remove(this); 5641 } 5642 mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED); 5643 } 5644 } 5645 5646 /** 5647 * Returns the quality of the drawing cache. 5648 * 5649 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5650 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5651 * 5652 * @see #setDrawingCacheQuality(int) 5653 * @see #setDrawingCacheEnabled(boolean) 5654 * @see #isDrawingCacheEnabled() 5655 * 5656 * @attr ref android.R.styleable#View_drawingCacheQuality 5657 */ 5658 public int getDrawingCacheQuality() { 5659 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5660 } 5661 5662 /** 5663 * Set the drawing cache quality of this view. This value is used only when the 5664 * drawing cache is enabled 5665 * 5666 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5667 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5668 * 5669 * @see #getDrawingCacheQuality() 5670 * @see #setDrawingCacheEnabled(boolean) 5671 * @see #isDrawingCacheEnabled() 5672 * 5673 * @attr ref android.R.styleable#View_drawingCacheQuality 5674 */ 5675 public void setDrawingCacheQuality(int quality) { 5676 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5677 } 5678 5679 /** 5680 * Returns whether the screen should remain on, corresponding to the current 5681 * value of {@link #KEEP_SCREEN_ON}. 5682 * 5683 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5684 * 5685 * @see #setKeepScreenOn(boolean) 5686 * 5687 * @attr ref android.R.styleable#View_keepScreenOn 5688 */ 5689 public boolean getKeepScreenOn() { 5690 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5691 } 5692 5693 /** 5694 * Controls whether the screen should remain on, modifying the 5695 * value of {@link #KEEP_SCREEN_ON}. 5696 * 5697 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5698 * 5699 * @see #getKeepScreenOn() 5700 * 5701 * @attr ref android.R.styleable#View_keepScreenOn 5702 */ 5703 public void setKeepScreenOn(boolean keepScreenOn) { 5704 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5705 } 5706 5707 /** 5708 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5709 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5710 * 5711 * @attr ref android.R.styleable#View_nextFocusLeft 5712 */ 5713 public int getNextFocusLeftId() { 5714 return mNextFocusLeftId; 5715 } 5716 5717 /** 5718 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5719 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5720 * decide automatically. 5721 * 5722 * @attr ref android.R.styleable#View_nextFocusLeft 5723 */ 5724 public void setNextFocusLeftId(int nextFocusLeftId) { 5725 mNextFocusLeftId = nextFocusLeftId; 5726 } 5727 5728 /** 5729 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5730 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5731 * 5732 * @attr ref android.R.styleable#View_nextFocusRight 5733 */ 5734 public int getNextFocusRightId() { 5735 return mNextFocusRightId; 5736 } 5737 5738 /** 5739 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5740 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5741 * decide automatically. 5742 * 5743 * @attr ref android.R.styleable#View_nextFocusRight 5744 */ 5745 public void setNextFocusRightId(int nextFocusRightId) { 5746 mNextFocusRightId = nextFocusRightId; 5747 } 5748 5749 /** 5750 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5751 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5752 * 5753 * @attr ref android.R.styleable#View_nextFocusUp 5754 */ 5755 public int getNextFocusUpId() { 5756 return mNextFocusUpId; 5757 } 5758 5759 /** 5760 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5761 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5762 * decide automatically. 5763 * 5764 * @attr ref android.R.styleable#View_nextFocusUp 5765 */ 5766 public void setNextFocusUpId(int nextFocusUpId) { 5767 mNextFocusUpId = nextFocusUpId; 5768 } 5769 5770 /** 5771 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5772 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5773 * 5774 * @attr ref android.R.styleable#View_nextFocusDown 5775 */ 5776 public int getNextFocusDownId() { 5777 return mNextFocusDownId; 5778 } 5779 5780 /** 5781 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5782 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5783 * decide automatically. 5784 * 5785 * @attr ref android.R.styleable#View_nextFocusDown 5786 */ 5787 public void setNextFocusDownId(int nextFocusDownId) { 5788 mNextFocusDownId = nextFocusDownId; 5789 } 5790 5791 /** 5792 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5793 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5794 * 5795 * @attr ref android.R.styleable#View_nextFocusForward 5796 */ 5797 public int getNextFocusForwardId() { 5798 return mNextFocusForwardId; 5799 } 5800 5801 /** 5802 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5803 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5804 * decide automatically. 5805 * 5806 * @attr ref android.R.styleable#View_nextFocusForward 5807 */ 5808 public void setNextFocusForwardId(int nextFocusForwardId) { 5809 mNextFocusForwardId = nextFocusForwardId; 5810 } 5811 5812 /** 5813 * Returns the visibility of this view and all of its ancestors 5814 * 5815 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5816 */ 5817 public boolean isShown() { 5818 View current = this; 5819 //noinspection ConstantConditions 5820 do { 5821 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5822 return false; 5823 } 5824 ViewParent parent = current.mParent; 5825 if (parent == null) { 5826 return false; // We are not attached to the view root 5827 } 5828 if (!(parent instanceof View)) { 5829 return true; 5830 } 5831 current = (View) parent; 5832 } while (current != null); 5833 5834 return false; 5835 } 5836 5837 /** 5838 * Called by the view hierarchy when the content insets for a window have 5839 * changed, to allow it to adjust its content to fit within those windows. 5840 * The content insets tell you the space that the status bar, input method, 5841 * and other system windows infringe on the application's window. 5842 * 5843 * <p>You do not normally need to deal with this function, since the default 5844 * window decoration given to applications takes care of applying it to the 5845 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5846 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5847 * and your content can be placed under those system elements. You can then 5848 * use this method within your view hierarchy if you have parts of your UI 5849 * which you would like to ensure are not being covered. 5850 * 5851 * <p>The default implementation of this method simply applies the content 5852 * insets to the view's padding, consuming that content (modifying the 5853 * insets to be 0), and returning true. This behavior is off by default, but can 5854 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5855 * 5856 * <p>This function's traversal down the hierarchy is depth-first. The same content 5857 * insets object is propagated down the hierarchy, so any changes made to it will 5858 * be seen by all following views (including potentially ones above in 5859 * the hierarchy since this is a depth-first traversal). The first view 5860 * that returns true will abort the entire traversal. 5861 * 5862 * <p>The default implementation works well for a situation where it is 5863 * used with a container that covers the entire window, allowing it to 5864 * apply the appropriate insets to its content on all edges. If you need 5865 * a more complicated layout (such as two different views fitting system 5866 * windows, one on the top of the window, and one on the bottom), 5867 * you can override the method and handle the insets however you would like. 5868 * Note that the insets provided by the framework are always relative to the 5869 * far edges of the window, not accounting for the location of the called view 5870 * within that window. (In fact when this method is called you do not yet know 5871 * where the layout will place the view, as it is done before layout happens.) 5872 * 5873 * <p>Note: unlike many View methods, there is no dispatch phase to this 5874 * call. If you are overriding it in a ViewGroup and want to allow the 5875 * call to continue to your children, you must be sure to call the super 5876 * implementation. 5877 * 5878 * <p>Here is a sample layout that makes use of fitting system windows 5879 * to have controls for a video view placed inside of the window decorations 5880 * that it hides and shows. This can be used with code like the second 5881 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5882 * 5883 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5884 * 5885 * @param insets Current content insets of the window. Prior to 5886 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5887 * the insets or else you and Android will be unhappy. 5888 * 5889 * @return {@code true} if this view applied the insets and it should not 5890 * continue propagating further down the hierarchy, {@code false} otherwise. 5891 * @see #getFitsSystemWindows() 5892 * @see #setFitsSystemWindows(boolean) 5893 * @see #setSystemUiVisibility(int) 5894 */ 5895 protected boolean fitSystemWindows(Rect insets) { 5896 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5897 mUserPaddingStart = UNDEFINED_PADDING; 5898 mUserPaddingEnd = UNDEFINED_PADDING; 5899 Rect localInsets = sThreadLocal.get(); 5900 if (localInsets == null) { 5901 localInsets = new Rect(); 5902 sThreadLocal.set(localInsets); 5903 } 5904 boolean res = computeFitSystemWindows(insets, localInsets); 5905 mUserPaddingLeftInitial = localInsets.left; 5906 mUserPaddingRightInitial = localInsets.right; 5907 internalSetPadding(localInsets.left, localInsets.top, 5908 localInsets.right, localInsets.bottom); 5909 return res; 5910 } 5911 return false; 5912 } 5913 5914 /** 5915 * @hide Compute the insets that should be consumed by this view and the ones 5916 * that should propagate to those under it. 5917 */ 5918 protected boolean computeFitSystemWindows(Rect inoutInsets, Rect outLocalInsets) { 5919 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5920 || mAttachInfo == null 5921 || ((mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0 5922 && !mAttachInfo.mOverscanRequested)) { 5923 outLocalInsets.set(inoutInsets); 5924 inoutInsets.set(0, 0, 0, 0); 5925 return true; 5926 } else { 5927 // The application wants to take care of fitting system window for 5928 // the content... however we still need to take care of any overscan here. 5929 final Rect overscan = mAttachInfo.mOverscanInsets; 5930 outLocalInsets.set(overscan); 5931 inoutInsets.left -= overscan.left; 5932 inoutInsets.top -= overscan.top; 5933 inoutInsets.right -= overscan.right; 5934 inoutInsets.bottom -= overscan.bottom; 5935 return false; 5936 } 5937 } 5938 5939 /** 5940 * Sets whether or not this view should account for system screen decorations 5941 * such as the status bar and inset its content; that is, controlling whether 5942 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5943 * executed. See that method for more details. 5944 * 5945 * <p>Note that if you are providing your own implementation of 5946 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5947 * flag to true -- your implementation will be overriding the default 5948 * implementation that checks this flag. 5949 * 5950 * @param fitSystemWindows If true, then the default implementation of 5951 * {@link #fitSystemWindows(Rect)} will be executed. 5952 * 5953 * @attr ref android.R.styleable#View_fitsSystemWindows 5954 * @see #getFitsSystemWindows() 5955 * @see #fitSystemWindows(Rect) 5956 * @see #setSystemUiVisibility(int) 5957 */ 5958 public void setFitsSystemWindows(boolean fitSystemWindows) { 5959 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5960 } 5961 5962 /** 5963 * Check for state of {@link #setFitsSystemWindows(boolean)}. If this method 5964 * returns {@code true}, the default implementation of {@link #fitSystemWindows(Rect)} 5965 * will be executed. 5966 * 5967 * @return {@code true} if the default implementation of 5968 * {@link #fitSystemWindows(Rect)} will be executed. 5969 * 5970 * @attr ref android.R.styleable#View_fitsSystemWindows 5971 * @see #setFitsSystemWindows(boolean) 5972 * @see #fitSystemWindows(Rect) 5973 * @see #setSystemUiVisibility(int) 5974 */ 5975 public boolean getFitsSystemWindows() { 5976 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5977 } 5978 5979 /** @hide */ 5980 public boolean fitsSystemWindows() { 5981 return getFitsSystemWindows(); 5982 } 5983 5984 /** 5985 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5986 */ 5987 public void requestFitSystemWindows() { 5988 if (mParent != null) { 5989 mParent.requestFitSystemWindows(); 5990 } 5991 } 5992 5993 /** 5994 * For use by PhoneWindow to make its own system window fitting optional. 5995 * @hide 5996 */ 5997 public void makeOptionalFitsSystemWindows() { 5998 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5999 } 6000 6001 /** 6002 * Returns the visibility status for this view. 6003 * 6004 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 6005 * @attr ref android.R.styleable#View_visibility 6006 */ 6007 @ViewDebug.ExportedProperty(mapping = { 6008 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 6009 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 6010 @ViewDebug.IntToString(from = GONE, to = "GONE") 6011 }) 6012 public int getVisibility() { 6013 return mViewFlags & VISIBILITY_MASK; 6014 } 6015 6016 /** 6017 * Set the enabled state of this view. 6018 * 6019 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 6020 * @attr ref android.R.styleable#View_visibility 6021 */ 6022 @RemotableViewMethod 6023 public void setVisibility(int visibility) { 6024 setFlags(visibility, VISIBILITY_MASK); 6025 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 6026 } 6027 6028 /** 6029 * Returns the enabled status for this view. The interpretation of the 6030 * enabled state varies by subclass. 6031 * 6032 * @return True if this view is enabled, false otherwise. 6033 */ 6034 @ViewDebug.ExportedProperty 6035 public boolean isEnabled() { 6036 return (mViewFlags & ENABLED_MASK) == ENABLED; 6037 } 6038 6039 /** 6040 * Set the enabled state of this view. The interpretation of the enabled 6041 * state varies by subclass. 6042 * 6043 * @param enabled True if this view is enabled, false otherwise. 6044 */ 6045 @RemotableViewMethod 6046 public void setEnabled(boolean enabled) { 6047 if (enabled == isEnabled()) return; 6048 6049 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 6050 6051 /* 6052 * The View most likely has to change its appearance, so refresh 6053 * the drawable state. 6054 */ 6055 refreshDrawableState(); 6056 6057 // Invalidate too, since the default behavior for views is to be 6058 // be drawn at 50% alpha rather than to change the drawable. 6059 invalidate(true); 6060 6061 if (!enabled) { 6062 cancelPendingInputEvents(); 6063 } 6064 } 6065 6066 /** 6067 * Set whether this view can receive the focus. 6068 * 6069 * Setting this to false will also ensure that this view is not focusable 6070 * in touch mode. 6071 * 6072 * @param focusable If true, this view can receive the focus. 6073 * 6074 * @see #setFocusableInTouchMode(boolean) 6075 * @attr ref android.R.styleable#View_focusable 6076 */ 6077 public void setFocusable(boolean focusable) { 6078 if (!focusable) { 6079 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 6080 } 6081 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 6082 } 6083 6084 /** 6085 * Set whether this view can receive focus while in touch mode. 6086 * 6087 * Setting this to true will also ensure that this view is focusable. 6088 * 6089 * @param focusableInTouchMode If true, this view can receive the focus while 6090 * in touch mode. 6091 * 6092 * @see #setFocusable(boolean) 6093 * @attr ref android.R.styleable#View_focusableInTouchMode 6094 */ 6095 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 6096 // Focusable in touch mode should always be set before the focusable flag 6097 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 6098 // which, in touch mode, will not successfully request focus on this view 6099 // because the focusable in touch mode flag is not set 6100 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 6101 if (focusableInTouchMode) { 6102 setFlags(FOCUSABLE, FOCUSABLE_MASK); 6103 } 6104 } 6105 6106 /** 6107 * Set whether this view should have sound effects enabled for events such as 6108 * clicking and touching. 6109 * 6110 * <p>You may wish to disable sound effects for a view if you already play sounds, 6111 * for instance, a dial key that plays dtmf tones. 6112 * 6113 * @param soundEffectsEnabled whether sound effects are enabled for this view. 6114 * @see #isSoundEffectsEnabled() 6115 * @see #playSoundEffect(int) 6116 * @attr ref android.R.styleable#View_soundEffectsEnabled 6117 */ 6118 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 6119 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 6120 } 6121 6122 /** 6123 * @return whether this view should have sound effects enabled for events such as 6124 * clicking and touching. 6125 * 6126 * @see #setSoundEffectsEnabled(boolean) 6127 * @see #playSoundEffect(int) 6128 * @attr ref android.R.styleable#View_soundEffectsEnabled 6129 */ 6130 @ViewDebug.ExportedProperty 6131 public boolean isSoundEffectsEnabled() { 6132 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 6133 } 6134 6135 /** 6136 * Set whether this view should have haptic feedback for events such as 6137 * long presses. 6138 * 6139 * <p>You may wish to disable haptic feedback if your view already controls 6140 * its own haptic feedback. 6141 * 6142 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 6143 * @see #isHapticFeedbackEnabled() 6144 * @see #performHapticFeedback(int) 6145 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 6146 */ 6147 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 6148 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 6149 } 6150 6151 /** 6152 * @return whether this view should have haptic feedback enabled for events 6153 * long presses. 6154 * 6155 * @see #setHapticFeedbackEnabled(boolean) 6156 * @see #performHapticFeedback(int) 6157 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 6158 */ 6159 @ViewDebug.ExportedProperty 6160 public boolean isHapticFeedbackEnabled() { 6161 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 6162 } 6163 6164 /** 6165 * Returns the layout direction for this view. 6166 * 6167 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 6168 * {@link #LAYOUT_DIRECTION_RTL}, 6169 * {@link #LAYOUT_DIRECTION_INHERIT} or 6170 * {@link #LAYOUT_DIRECTION_LOCALE}. 6171 * 6172 * @attr ref android.R.styleable#View_layoutDirection 6173 * 6174 * @hide 6175 */ 6176 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6177 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 6178 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 6179 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 6180 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 6181 }) 6182 public int getRawLayoutDirection() { 6183 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 6184 } 6185 6186 /** 6187 * Set the layout direction for this view. This will propagate a reset of layout direction 6188 * resolution to the view's children and resolve layout direction for this view. 6189 * 6190 * @param layoutDirection the layout direction to set. Should be one of: 6191 * 6192 * {@link #LAYOUT_DIRECTION_LTR}, 6193 * {@link #LAYOUT_DIRECTION_RTL}, 6194 * {@link #LAYOUT_DIRECTION_INHERIT}, 6195 * {@link #LAYOUT_DIRECTION_LOCALE}. 6196 * 6197 * Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution 6198 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 6199 * will return the default {@link #LAYOUT_DIRECTION_LTR}. 6200 * 6201 * @attr ref android.R.styleable#View_layoutDirection 6202 */ 6203 @RemotableViewMethod 6204 public void setLayoutDirection(int layoutDirection) { 6205 if (getRawLayoutDirection() != layoutDirection) { 6206 // Reset the current layout direction and the resolved one 6207 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK; 6208 resetRtlProperties(); 6209 // Set the new layout direction (filtered) 6210 mPrivateFlags2 |= 6211 ((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK); 6212 // We need to resolve all RTL properties as they all depend on layout direction 6213 resolveRtlPropertiesIfNeeded(); 6214 requestLayout(); 6215 invalidate(true); 6216 } 6217 } 6218 6219 /** 6220 * Returns the resolved layout direction for this view. 6221 * 6222 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 6223 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 6224 * 6225 * For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version 6226 * is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}. 6227 * 6228 * @attr ref android.R.styleable#View_layoutDirection 6229 */ 6230 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6231 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 6232 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 6233 }) 6234 public int getLayoutDirection() { 6235 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 6236 if (targetSdkVersion < JELLY_BEAN_MR1) { 6237 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 6238 return LAYOUT_DIRECTION_RESOLVED_DEFAULT; 6239 } 6240 return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) == 6241 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 6242 } 6243 6244 /** 6245 * Indicates whether or not this view's layout is right-to-left. This is resolved from 6246 * layout attribute and/or the inherited value from the parent 6247 * 6248 * @return true if the layout is right-to-left. 6249 * 6250 * @hide 6251 */ 6252 @ViewDebug.ExportedProperty(category = "layout") 6253 public boolean isLayoutRtl() { 6254 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL); 6255 } 6256 6257 /** 6258 * Indicates whether the view is currently tracking transient state that the 6259 * app should not need to concern itself with saving and restoring, but that 6260 * the framework should take special note to preserve when possible. 6261 * 6262 * <p>A view with transient state cannot be trivially rebound from an external 6263 * data source, such as an adapter binding item views in a list. This may be 6264 * because the view is performing an animation, tracking user selection 6265 * of content, or similar.</p> 6266 * 6267 * @return true if the view has transient state 6268 */ 6269 @ViewDebug.ExportedProperty(category = "layout") 6270 public boolean hasTransientState() { 6271 return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE; 6272 } 6273 6274 /** 6275 * Set whether this view is currently tracking transient state that the 6276 * framework should attempt to preserve when possible. This flag is reference counted, 6277 * so every call to setHasTransientState(true) should be paired with a later call 6278 * to setHasTransientState(false). 6279 * 6280 * <p>A view with transient state cannot be trivially rebound from an external 6281 * data source, such as an adapter binding item views in a list. This may be 6282 * because the view is performing an animation, tracking user selection 6283 * of content, or similar.</p> 6284 * 6285 * @param hasTransientState true if this view has transient state 6286 */ 6287 public void setHasTransientState(boolean hasTransientState) { 6288 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 6289 mTransientStateCount - 1; 6290 if (mTransientStateCount < 0) { 6291 mTransientStateCount = 0; 6292 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 6293 "unmatched pair of setHasTransientState calls"); 6294 } else if ((hasTransientState && mTransientStateCount == 1) || 6295 (!hasTransientState && mTransientStateCount == 0)) { 6296 // update flag if we've just incremented up from 0 or decremented down to 0 6297 mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) | 6298 (hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0); 6299 if (mParent != null) { 6300 try { 6301 mParent.childHasTransientStateChanged(this, hasTransientState); 6302 } catch (AbstractMethodError e) { 6303 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 6304 " does not fully implement ViewParent", e); 6305 } 6306 } 6307 } 6308 } 6309 6310 /** 6311 * Returns true if this view is currently attached to a window. 6312 */ 6313 public boolean isAttachedToWindow() { 6314 return mAttachInfo != null; 6315 } 6316 6317 /** 6318 * Returns true if this view has been through at least one layout since it 6319 * was last attached to or detached from a window. 6320 */ 6321 public boolean isLaidOut() { 6322 return (mPrivateFlags3 & PFLAG3_IS_LAID_OUT) == PFLAG3_IS_LAID_OUT; 6323 } 6324 6325 /** 6326 * If this view doesn't do any drawing on its own, set this flag to 6327 * allow further optimizations. By default, this flag is not set on 6328 * View, but could be set on some View subclasses such as ViewGroup. 6329 * 6330 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 6331 * you should clear this flag. 6332 * 6333 * @param willNotDraw whether or not this View draw on its own 6334 */ 6335 public void setWillNotDraw(boolean willNotDraw) { 6336 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 6337 } 6338 6339 /** 6340 * Returns whether or not this View draws on its own. 6341 * 6342 * @return true if this view has nothing to draw, false otherwise 6343 */ 6344 @ViewDebug.ExportedProperty(category = "drawing") 6345 public boolean willNotDraw() { 6346 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 6347 } 6348 6349 /** 6350 * When a View's drawing cache is enabled, drawing is redirected to an 6351 * offscreen bitmap. Some views, like an ImageView, must be able to 6352 * bypass this mechanism if they already draw a single bitmap, to avoid 6353 * unnecessary usage of the memory. 6354 * 6355 * @param willNotCacheDrawing true if this view does not cache its 6356 * drawing, false otherwise 6357 */ 6358 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 6359 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 6360 } 6361 6362 /** 6363 * Returns whether or not this View can cache its drawing or not. 6364 * 6365 * @return true if this view does not cache its drawing, false otherwise 6366 */ 6367 @ViewDebug.ExportedProperty(category = "drawing") 6368 public boolean willNotCacheDrawing() { 6369 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 6370 } 6371 6372 /** 6373 * Indicates whether this view reacts to click events or not. 6374 * 6375 * @return true if the view is clickable, false otherwise 6376 * 6377 * @see #setClickable(boolean) 6378 * @attr ref android.R.styleable#View_clickable 6379 */ 6380 @ViewDebug.ExportedProperty 6381 public boolean isClickable() { 6382 return (mViewFlags & CLICKABLE) == CLICKABLE; 6383 } 6384 6385 /** 6386 * Enables or disables click events for this view. When a view 6387 * is clickable it will change its state to "pressed" on every click. 6388 * Subclasses should set the view clickable to visually react to 6389 * user's clicks. 6390 * 6391 * @param clickable true to make the view clickable, false otherwise 6392 * 6393 * @see #isClickable() 6394 * @attr ref android.R.styleable#View_clickable 6395 */ 6396 public void setClickable(boolean clickable) { 6397 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 6398 } 6399 6400 /** 6401 * Indicates whether this view reacts to long click events or not. 6402 * 6403 * @return true if the view is long clickable, false otherwise 6404 * 6405 * @see #setLongClickable(boolean) 6406 * @attr ref android.R.styleable#View_longClickable 6407 */ 6408 public boolean isLongClickable() { 6409 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6410 } 6411 6412 /** 6413 * Enables or disables long click events for this view. When a view is long 6414 * clickable it reacts to the user holding down the button for a longer 6415 * duration than a tap. This event can either launch the listener or a 6416 * context menu. 6417 * 6418 * @param longClickable true to make the view long clickable, false otherwise 6419 * @see #isLongClickable() 6420 * @attr ref android.R.styleable#View_longClickable 6421 */ 6422 public void setLongClickable(boolean longClickable) { 6423 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 6424 } 6425 6426 /** 6427 * Sets the pressed state for this view. 6428 * 6429 * @see #isClickable() 6430 * @see #setClickable(boolean) 6431 * 6432 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 6433 * the View's internal state from a previously set "pressed" state. 6434 */ 6435 public void setPressed(boolean pressed) { 6436 final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED); 6437 6438 if (pressed) { 6439 mPrivateFlags |= PFLAG_PRESSED; 6440 } else { 6441 mPrivateFlags &= ~PFLAG_PRESSED; 6442 } 6443 6444 if (needsRefresh) { 6445 refreshDrawableState(); 6446 } 6447 dispatchSetPressed(pressed); 6448 } 6449 6450 /** 6451 * Dispatch setPressed to all of this View's children. 6452 * 6453 * @see #setPressed(boolean) 6454 * 6455 * @param pressed The new pressed state 6456 */ 6457 protected void dispatchSetPressed(boolean pressed) { 6458 } 6459 6460 /** 6461 * Indicates whether the view is currently in pressed state. Unless 6462 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 6463 * the pressed state. 6464 * 6465 * @see #setPressed(boolean) 6466 * @see #isClickable() 6467 * @see #setClickable(boolean) 6468 * 6469 * @return true if the view is currently pressed, false otherwise 6470 */ 6471 public boolean isPressed() { 6472 return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED; 6473 } 6474 6475 /** 6476 * Indicates whether this view will save its state (that is, 6477 * whether its {@link #onSaveInstanceState} method will be called). 6478 * 6479 * @return Returns true if the view state saving is enabled, else false. 6480 * 6481 * @see #setSaveEnabled(boolean) 6482 * @attr ref android.R.styleable#View_saveEnabled 6483 */ 6484 public boolean isSaveEnabled() { 6485 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 6486 } 6487 6488 /** 6489 * Controls whether the saving of this view's state is 6490 * enabled (that is, whether its {@link #onSaveInstanceState} method 6491 * will be called). Note that even if freezing is enabled, the 6492 * view still must have an id assigned to it (via {@link #setId(int)}) 6493 * for its state to be saved. This flag can only disable the 6494 * saving of this view; any child views may still have their state saved. 6495 * 6496 * @param enabled Set to false to <em>disable</em> state saving, or true 6497 * (the default) to allow it. 6498 * 6499 * @see #isSaveEnabled() 6500 * @see #setId(int) 6501 * @see #onSaveInstanceState() 6502 * @attr ref android.R.styleable#View_saveEnabled 6503 */ 6504 public void setSaveEnabled(boolean enabled) { 6505 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 6506 } 6507 6508 /** 6509 * Gets whether the framework should discard touches when the view's 6510 * window is obscured by another visible window. 6511 * Refer to the {@link View} security documentation for more details. 6512 * 6513 * @return True if touch filtering is enabled. 6514 * 6515 * @see #setFilterTouchesWhenObscured(boolean) 6516 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6517 */ 6518 @ViewDebug.ExportedProperty 6519 public boolean getFilterTouchesWhenObscured() { 6520 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 6521 } 6522 6523 /** 6524 * Sets whether the framework should discard touches when the view's 6525 * window is obscured by another visible window. 6526 * Refer to the {@link View} security documentation for more details. 6527 * 6528 * @param enabled True if touch filtering should be enabled. 6529 * 6530 * @see #getFilterTouchesWhenObscured 6531 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6532 */ 6533 public void setFilterTouchesWhenObscured(boolean enabled) { 6534 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 6535 FILTER_TOUCHES_WHEN_OBSCURED); 6536 } 6537 6538 /** 6539 * Indicates whether the entire hierarchy under this view will save its 6540 * state when a state saving traversal occurs from its parent. The default 6541 * is true; if false, these views will not be saved unless 6542 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6543 * 6544 * @return Returns true if the view state saving from parent is enabled, else false. 6545 * 6546 * @see #setSaveFromParentEnabled(boolean) 6547 */ 6548 public boolean isSaveFromParentEnabled() { 6549 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 6550 } 6551 6552 /** 6553 * Controls whether the entire hierarchy under this view will save its 6554 * state when a state saving traversal occurs from its parent. The default 6555 * is true; if false, these views will not be saved unless 6556 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6557 * 6558 * @param enabled Set to false to <em>disable</em> state saving, or true 6559 * (the default) to allow it. 6560 * 6561 * @see #isSaveFromParentEnabled() 6562 * @see #setId(int) 6563 * @see #onSaveInstanceState() 6564 */ 6565 public void setSaveFromParentEnabled(boolean enabled) { 6566 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 6567 } 6568 6569 6570 /** 6571 * Returns whether this View is able to take focus. 6572 * 6573 * @return True if this view can take focus, or false otherwise. 6574 * @attr ref android.R.styleable#View_focusable 6575 */ 6576 @ViewDebug.ExportedProperty(category = "focus") 6577 public final boolean isFocusable() { 6578 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 6579 } 6580 6581 /** 6582 * When a view is focusable, it may not want to take focus when in touch mode. 6583 * For example, a button would like focus when the user is navigating via a D-pad 6584 * so that the user can click on it, but once the user starts touching the screen, 6585 * the button shouldn't take focus 6586 * @return Whether the view is focusable in touch mode. 6587 * @attr ref android.R.styleable#View_focusableInTouchMode 6588 */ 6589 @ViewDebug.ExportedProperty 6590 public final boolean isFocusableInTouchMode() { 6591 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 6592 } 6593 6594 /** 6595 * Find the nearest view in the specified direction that can take focus. 6596 * This does not actually give focus to that view. 6597 * 6598 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6599 * 6600 * @return The nearest focusable in the specified direction, or null if none 6601 * can be found. 6602 */ 6603 public View focusSearch(int direction) { 6604 if (mParent != null) { 6605 return mParent.focusSearch(this, direction); 6606 } else { 6607 return null; 6608 } 6609 } 6610 6611 /** 6612 * This method is the last chance for the focused view and its ancestors to 6613 * respond to an arrow key. This is called when the focused view did not 6614 * consume the key internally, nor could the view system find a new view in 6615 * the requested direction to give focus to. 6616 * 6617 * @param focused The currently focused view. 6618 * @param direction The direction focus wants to move. One of FOCUS_UP, 6619 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 6620 * @return True if the this view consumed this unhandled move. 6621 */ 6622 public boolean dispatchUnhandledMove(View focused, int direction) { 6623 return false; 6624 } 6625 6626 /** 6627 * If a user manually specified the next view id for a particular direction, 6628 * use the root to look up the view. 6629 * @param root The root view of the hierarchy containing this view. 6630 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 6631 * or FOCUS_BACKWARD. 6632 * @return The user specified next view, or null if there is none. 6633 */ 6634 View findUserSetNextFocus(View root, int direction) { 6635 switch (direction) { 6636 case FOCUS_LEFT: 6637 if (mNextFocusLeftId == View.NO_ID) return null; 6638 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 6639 case FOCUS_RIGHT: 6640 if (mNextFocusRightId == View.NO_ID) return null; 6641 return findViewInsideOutShouldExist(root, mNextFocusRightId); 6642 case FOCUS_UP: 6643 if (mNextFocusUpId == View.NO_ID) return null; 6644 return findViewInsideOutShouldExist(root, mNextFocusUpId); 6645 case FOCUS_DOWN: 6646 if (mNextFocusDownId == View.NO_ID) return null; 6647 return findViewInsideOutShouldExist(root, mNextFocusDownId); 6648 case FOCUS_FORWARD: 6649 if (mNextFocusForwardId == View.NO_ID) return null; 6650 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 6651 case FOCUS_BACKWARD: { 6652 if (mID == View.NO_ID) return null; 6653 final int id = mID; 6654 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 6655 @Override 6656 public boolean apply(View t) { 6657 return t.mNextFocusForwardId == id; 6658 } 6659 }); 6660 } 6661 } 6662 return null; 6663 } 6664 6665 private View findViewInsideOutShouldExist(View root, int id) { 6666 if (mMatchIdPredicate == null) { 6667 mMatchIdPredicate = new MatchIdPredicate(); 6668 } 6669 mMatchIdPredicate.mId = id; 6670 View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate); 6671 if (result == null) { 6672 Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id); 6673 } 6674 return result; 6675 } 6676 6677 /** 6678 * Find and return all focusable views that are descendants of this view, 6679 * possibly including this view if it is focusable itself. 6680 * 6681 * @param direction The direction of the focus 6682 * @return A list of focusable views 6683 */ 6684 public ArrayList<View> getFocusables(int direction) { 6685 ArrayList<View> result = new ArrayList<View>(24); 6686 addFocusables(result, direction); 6687 return result; 6688 } 6689 6690 /** 6691 * Add any focusable views that are descendants of this view (possibly 6692 * including this view if it is focusable itself) to views. If we are in touch mode, 6693 * only add views that are also focusable in touch mode. 6694 * 6695 * @param views Focusable views found so far 6696 * @param direction The direction of the focus 6697 */ 6698 public void addFocusables(ArrayList<View> views, int direction) { 6699 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6700 } 6701 6702 /** 6703 * Adds any focusable views that are descendants of this view (possibly 6704 * including this view if it is focusable itself) to views. This method 6705 * adds all focusable views regardless if we are in touch mode or 6706 * only views focusable in touch mode if we are in touch mode or 6707 * only views that can take accessibility focus if accessibility is enabeld 6708 * depending on the focusable mode paramater. 6709 * 6710 * @param views Focusable views found so far or null if all we are interested is 6711 * the number of focusables. 6712 * @param direction The direction of the focus. 6713 * @param focusableMode The type of focusables to be added. 6714 * 6715 * @see #FOCUSABLES_ALL 6716 * @see #FOCUSABLES_TOUCH_MODE 6717 */ 6718 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6719 if (views == null) { 6720 return; 6721 } 6722 if (!isFocusable()) { 6723 return; 6724 } 6725 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6726 && isInTouchMode() && !isFocusableInTouchMode()) { 6727 return; 6728 } 6729 views.add(this); 6730 } 6731 6732 /** 6733 * Finds the Views that contain given text. The containment is case insensitive. 6734 * The search is performed by either the text that the View renders or the content 6735 * description that describes the view for accessibility purposes and the view does 6736 * not render or both. Clients can specify how the search is to be performed via 6737 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6738 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6739 * 6740 * @param outViews The output list of matching Views. 6741 * @param searched The text to match against. 6742 * 6743 * @see #FIND_VIEWS_WITH_TEXT 6744 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6745 * @see #setContentDescription(CharSequence) 6746 */ 6747 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6748 if (getAccessibilityNodeProvider() != null) { 6749 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6750 outViews.add(this); 6751 } 6752 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6753 && (searched != null && searched.length() > 0) 6754 && (mContentDescription != null && mContentDescription.length() > 0)) { 6755 String searchedLowerCase = searched.toString().toLowerCase(); 6756 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6757 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6758 outViews.add(this); 6759 } 6760 } 6761 } 6762 6763 /** 6764 * Find and return all touchable views that are descendants of this view, 6765 * possibly including this view if it is touchable itself. 6766 * 6767 * @return A list of touchable views 6768 */ 6769 public ArrayList<View> getTouchables() { 6770 ArrayList<View> result = new ArrayList<View>(); 6771 addTouchables(result); 6772 return result; 6773 } 6774 6775 /** 6776 * Add any touchable views that are descendants of this view (possibly 6777 * including this view if it is touchable itself) to views. 6778 * 6779 * @param views Touchable views found so far 6780 */ 6781 public void addTouchables(ArrayList<View> views) { 6782 final int viewFlags = mViewFlags; 6783 6784 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6785 && (viewFlags & ENABLED_MASK) == ENABLED) { 6786 views.add(this); 6787 } 6788 } 6789 6790 /** 6791 * Returns whether this View is accessibility focused. 6792 * 6793 * @return True if this View is accessibility focused. 6794 * @hide 6795 */ 6796 public boolean isAccessibilityFocused() { 6797 return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0; 6798 } 6799 6800 /** 6801 * Call this to try to give accessibility focus to this view. 6802 * 6803 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6804 * returns false or the view is no visible or the view already has accessibility 6805 * focus. 6806 * 6807 * See also {@link #focusSearch(int)}, which is what you call to say that you 6808 * have focus, and you want your parent to look for the next one. 6809 * 6810 * @return Whether this view actually took accessibility focus. 6811 * 6812 * @hide 6813 */ 6814 public boolean requestAccessibilityFocus() { 6815 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6816 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6817 return false; 6818 } 6819 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6820 return false; 6821 } 6822 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) { 6823 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED; 6824 ViewRootImpl viewRootImpl = getViewRootImpl(); 6825 if (viewRootImpl != null) { 6826 viewRootImpl.setAccessibilityFocus(this, null); 6827 } 6828 invalidate(); 6829 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6830 return true; 6831 } 6832 return false; 6833 } 6834 6835 /** 6836 * Call this to try to clear accessibility focus of this view. 6837 * 6838 * See also {@link #focusSearch(int)}, which is what you call to say that you 6839 * have focus, and you want your parent to look for the next one. 6840 * 6841 * @hide 6842 */ 6843 public void clearAccessibilityFocus() { 6844 clearAccessibilityFocusNoCallbacks(); 6845 // Clear the global reference of accessibility focus if this 6846 // view or any of its descendants had accessibility focus. 6847 ViewRootImpl viewRootImpl = getViewRootImpl(); 6848 if (viewRootImpl != null) { 6849 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6850 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6851 viewRootImpl.setAccessibilityFocus(null, null); 6852 } 6853 } 6854 } 6855 6856 private void sendAccessibilityHoverEvent(int eventType) { 6857 // Since we are not delivering to a client accessibility events from not 6858 // important views (unless the clinet request that) we need to fire the 6859 // event from the deepest view exposed to the client. As a consequence if 6860 // the user crosses a not exposed view the client will see enter and exit 6861 // of the exposed predecessor followed by and enter and exit of that same 6862 // predecessor when entering and exiting the not exposed descendant. This 6863 // is fine since the client has a clear idea which view is hovered at the 6864 // price of a couple more events being sent. This is a simple and 6865 // working solution. 6866 View source = this; 6867 while (true) { 6868 if (source.includeForAccessibility()) { 6869 source.sendAccessibilityEvent(eventType); 6870 return; 6871 } 6872 ViewParent parent = source.getParent(); 6873 if (parent instanceof View) { 6874 source = (View) parent; 6875 } else { 6876 return; 6877 } 6878 } 6879 } 6880 6881 /** 6882 * Clears accessibility focus without calling any callback methods 6883 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6884 * is used for clearing accessibility focus when giving this focus to 6885 * another view. 6886 */ 6887 void clearAccessibilityFocusNoCallbacks() { 6888 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { 6889 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; 6890 invalidate(); 6891 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6892 } 6893 } 6894 6895 /** 6896 * Call this to try to give focus to a specific view or to one of its 6897 * descendants. 6898 * 6899 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6900 * false), or if it is focusable and it is not focusable in touch mode 6901 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6902 * 6903 * See also {@link #focusSearch(int)}, which is what you call to say that you 6904 * have focus, and you want your parent to look for the next one. 6905 * 6906 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6907 * {@link #FOCUS_DOWN} and <code>null</code>. 6908 * 6909 * @return Whether this view or one of its descendants actually took focus. 6910 */ 6911 public final boolean requestFocus() { 6912 return requestFocus(View.FOCUS_DOWN); 6913 } 6914 6915 /** 6916 * Call this to try to give focus to a specific view or to one of its 6917 * descendants and give it a hint about what direction focus is heading. 6918 * 6919 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6920 * false), or if it is focusable and it is not focusable in touch mode 6921 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6922 * 6923 * See also {@link #focusSearch(int)}, which is what you call to say that you 6924 * have focus, and you want your parent to look for the next one. 6925 * 6926 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6927 * <code>null</code> set for the previously focused rectangle. 6928 * 6929 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6930 * @return Whether this view or one of its descendants actually took focus. 6931 */ 6932 public final boolean requestFocus(int direction) { 6933 return requestFocus(direction, null); 6934 } 6935 6936 /** 6937 * Call this to try to give focus to a specific view or to one of its descendants 6938 * and give it hints about the direction and a specific rectangle that the focus 6939 * is coming from. The rectangle can help give larger views a finer grained hint 6940 * about where focus is coming from, and therefore, where to show selection, or 6941 * forward focus change internally. 6942 * 6943 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6944 * false), or if it is focusable and it is not focusable in touch mode 6945 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6946 * 6947 * A View will not take focus if it is not visible. 6948 * 6949 * A View will not take focus if one of its parents has 6950 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6951 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6952 * 6953 * See also {@link #focusSearch(int)}, which is what you call to say that you 6954 * have focus, and you want your parent to look for the next one. 6955 * 6956 * You may wish to override this method if your custom {@link View} has an internal 6957 * {@link View} that it wishes to forward the request to. 6958 * 6959 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6960 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6961 * to give a finer grained hint about where focus is coming from. May be null 6962 * if there is no hint. 6963 * @return Whether this view or one of its descendants actually took focus. 6964 */ 6965 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6966 return requestFocusNoSearch(direction, previouslyFocusedRect); 6967 } 6968 6969 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6970 // need to be focusable 6971 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6972 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6973 return false; 6974 } 6975 6976 // need to be focusable in touch mode if in touch mode 6977 if (isInTouchMode() && 6978 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6979 return false; 6980 } 6981 6982 // need to not have any parents blocking us 6983 if (hasAncestorThatBlocksDescendantFocus()) { 6984 return false; 6985 } 6986 6987 handleFocusGainInternal(direction, previouslyFocusedRect); 6988 return true; 6989 } 6990 6991 /** 6992 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6993 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6994 * touch mode to request focus when they are touched. 6995 * 6996 * @return Whether this view or one of its descendants actually took focus. 6997 * 6998 * @see #isInTouchMode() 6999 * 7000 */ 7001 public final boolean requestFocusFromTouch() { 7002 // Leave touch mode if we need to 7003 if (isInTouchMode()) { 7004 ViewRootImpl viewRoot = getViewRootImpl(); 7005 if (viewRoot != null) { 7006 viewRoot.ensureTouchMode(false); 7007 } 7008 } 7009 return requestFocus(View.FOCUS_DOWN); 7010 } 7011 7012 /** 7013 * @return Whether any ancestor of this view blocks descendant focus. 7014 */ 7015 private boolean hasAncestorThatBlocksDescendantFocus() { 7016 ViewParent ancestor = mParent; 7017 while (ancestor instanceof ViewGroup) { 7018 final ViewGroup vgAncestor = (ViewGroup) ancestor; 7019 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 7020 return true; 7021 } else { 7022 ancestor = vgAncestor.getParent(); 7023 } 7024 } 7025 return false; 7026 } 7027 7028 /** 7029 * Gets the mode for determining whether this View is important for accessibility 7030 * which is if it fires accessibility events and if it is reported to 7031 * accessibility services that query the screen. 7032 * 7033 * @return The mode for determining whether a View is important for accessibility. 7034 * 7035 * @attr ref android.R.styleable#View_importantForAccessibility 7036 * 7037 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 7038 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 7039 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS 7040 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 7041 */ 7042 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 7043 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), 7044 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), 7045 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no"), 7046 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS, 7047 to = "noHideDescendants") 7048 }) 7049 public int getImportantForAccessibility() { 7050 return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 7051 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 7052 } 7053 7054 /** 7055 * Sets the live region mode for this view. This indicates to accessibility 7056 * services whether they should automatically notify the user about changes 7057 * to the view's content description or text, or to the content descriptions 7058 * or text of the view's children (where applicable). 7059 * <p> 7060 * For example, in a login screen with a TextView that displays an "incorrect 7061 * password" notification, that view should be marked as a live region with 7062 * mode {@link #ACCESSIBILITY_LIVE_REGION_POLITE}. 7063 * <p> 7064 * To disable change notifications for this view, use 7065 * {@link #ACCESSIBILITY_LIVE_REGION_NONE}. This is the default live region 7066 * mode for most views. 7067 * <p> 7068 * To indicate that the user should be notified of changes, use 7069 * {@link #ACCESSIBILITY_LIVE_REGION_POLITE}. 7070 * <p> 7071 * If the view's changes should interrupt ongoing speech and notify the user 7072 * immediately, use {@link #ACCESSIBILITY_LIVE_REGION_ASSERTIVE}. 7073 * 7074 * @param mode The live region mode for this view, one of: 7075 * <ul> 7076 * <li>{@link #ACCESSIBILITY_LIVE_REGION_NONE} 7077 * <li>{@link #ACCESSIBILITY_LIVE_REGION_POLITE} 7078 * <li>{@link #ACCESSIBILITY_LIVE_REGION_ASSERTIVE} 7079 * </ul> 7080 * @attr ref android.R.styleable#View_accessibilityLiveRegion 7081 */ 7082 public void setAccessibilityLiveRegion(int mode) { 7083 if (mode != getAccessibilityLiveRegion()) { 7084 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK; 7085 mPrivateFlags2 |= (mode << PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT) 7086 & PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK; 7087 notifyViewAccessibilityStateChangedIfNeeded( 7088 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 7089 } 7090 } 7091 7092 /** 7093 * Gets the live region mode for this View. 7094 * 7095 * @return The live region mode for the view. 7096 * 7097 * @attr ref android.R.styleable#View_accessibilityLiveRegion 7098 * 7099 * @see #setAccessibilityLiveRegion(int) 7100 */ 7101 public int getAccessibilityLiveRegion() { 7102 return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK) 7103 >> PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT; 7104 } 7105 7106 /** 7107 * Sets how to determine whether this view is important for accessibility 7108 * which is if it fires accessibility events and if it is reported to 7109 * accessibility services that query the screen. 7110 * 7111 * @param mode How to determine whether this view is important for accessibility. 7112 * 7113 * @attr ref android.R.styleable#View_importantForAccessibility 7114 * 7115 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 7116 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 7117 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS 7118 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 7119 */ 7120 public void setImportantForAccessibility(int mode) { 7121 final int oldMode = getImportantForAccessibility(); 7122 if (mode != oldMode) { 7123 // If we're moving between AUTO and another state, we might not need 7124 // to send a subtree changed notification. We'll store the computed 7125 // importance, since we'll need to check it later to make sure. 7126 final boolean maySkipNotify = oldMode == IMPORTANT_FOR_ACCESSIBILITY_AUTO 7127 || mode == IMPORTANT_FOR_ACCESSIBILITY_AUTO; 7128 final boolean oldIncludeForAccessibility = maySkipNotify && includeForAccessibility(); 7129 mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 7130 mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 7131 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 7132 if (!maySkipNotify || oldIncludeForAccessibility != includeForAccessibility()) { 7133 notifySubtreeAccessibilityStateChangedIfNeeded(); 7134 } else { 7135 notifyViewAccessibilityStateChangedIfNeeded( 7136 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 7137 } 7138 } 7139 } 7140 7141 /** 7142 * Gets whether this view should be exposed for accessibility. 7143 * 7144 * @return Whether the view is exposed for accessibility. 7145 * 7146 * @hide 7147 */ 7148 public boolean isImportantForAccessibility() { 7149 final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 7150 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 7151 if (mode == IMPORTANT_FOR_ACCESSIBILITY_NO 7152 || mode == IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) { 7153 return false; 7154 } 7155 7156 // Check parent mode to ensure we're not hidden. 7157 ViewParent parent = mParent; 7158 while (parent instanceof View) { 7159 if (((View) parent).getImportantForAccessibility() 7160 == IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) { 7161 return false; 7162 } 7163 parent = parent.getParent(); 7164 } 7165 7166 return mode == IMPORTANT_FOR_ACCESSIBILITY_YES || isActionableForAccessibility() 7167 || hasListenersForAccessibility() || getAccessibilityNodeProvider() != null 7168 || getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE; 7169 } 7170 7171 /** 7172 * Gets the parent for accessibility purposes. Note that the parent for 7173 * accessibility is not necessary the immediate parent. It is the first 7174 * predecessor that is important for accessibility. 7175 * 7176 * @return The parent for accessibility purposes. 7177 */ 7178 public ViewParent getParentForAccessibility() { 7179 if (mParent instanceof View) { 7180 View parentView = (View) mParent; 7181 if (parentView.includeForAccessibility()) { 7182 return mParent; 7183 } else { 7184 return mParent.getParentForAccessibility(); 7185 } 7186 } 7187 return null; 7188 } 7189 7190 /** 7191 * Adds the children of a given View for accessibility. Since some Views are 7192 * not important for accessibility the children for accessibility are not 7193 * necessarily direct children of the view, rather they are the first level of 7194 * descendants important for accessibility. 7195 * 7196 * @param children The list of children for accessibility. 7197 */ 7198 public void addChildrenForAccessibility(ArrayList<View> children) { 7199 if (includeForAccessibility()) { 7200 children.add(this); 7201 } 7202 } 7203 7204 /** 7205 * Whether to regard this view for accessibility. A view is regarded for 7206 * accessibility if it is important for accessibility or the querying 7207 * accessibility service has explicitly requested that view not 7208 * important for accessibility are regarded. 7209 * 7210 * @return Whether to regard the view for accessibility. 7211 * 7212 * @hide 7213 */ 7214 public boolean includeForAccessibility() { 7215 //noinspection SimplifiableIfStatement 7216 if (mAttachInfo != null) { 7217 return (mAttachInfo.mAccessibilityFetchFlags 7218 & AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0 7219 || isImportantForAccessibility(); 7220 } 7221 return false; 7222 } 7223 7224 /** 7225 * Returns whether the View is considered actionable from 7226 * accessibility perspective. Such view are important for 7227 * accessibility. 7228 * 7229 * @return True if the view is actionable for accessibility. 7230 * 7231 * @hide 7232 */ 7233 public boolean isActionableForAccessibility() { 7234 return (isClickable() || isLongClickable() || isFocusable()); 7235 } 7236 7237 /** 7238 * Returns whether the View has registered callbacks wich makes it 7239 * important for accessibility. 7240 * 7241 * @return True if the view is actionable for accessibility. 7242 */ 7243 private boolean hasListenersForAccessibility() { 7244 ListenerInfo info = getListenerInfo(); 7245 return mTouchDelegate != null || info.mOnKeyListener != null 7246 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 7247 || info.mOnHoverListener != null || info.mOnDragListener != null; 7248 } 7249 7250 /** 7251 * Notifies that the accessibility state of this view changed. The change 7252 * is local to this view and does not represent structural changes such 7253 * as children and parent. For example, the view became focusable. The 7254 * notification is at at most once every 7255 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 7256 * to avoid unnecessary load to the system. Also once a view has a pending 7257 * notifucation this method is a NOP until the notification has been sent. 7258 * 7259 * @hide 7260 */ 7261 public void notifyViewAccessibilityStateChangedIfNeeded(int changeType) { 7262 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 7263 return; 7264 } 7265 if (mSendViewStateChangedAccessibilityEvent == null) { 7266 mSendViewStateChangedAccessibilityEvent = 7267 new SendViewStateChangedAccessibilityEvent(); 7268 } 7269 mSendViewStateChangedAccessibilityEvent.runOrPost(changeType); 7270 } 7271 7272 /** 7273 * Notifies that the accessibility state of this view changed. The change 7274 * is *not* local to this view and does represent structural changes such 7275 * as children and parent. For example, the view size changed. The 7276 * notification is at at most once every 7277 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 7278 * to avoid unnecessary load to the system. Also once a view has a pending 7279 * notifucation this method is a NOP until the notification has been sent. 7280 * 7281 * @hide 7282 */ 7283 public void notifySubtreeAccessibilityStateChangedIfNeeded() { 7284 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 7285 return; 7286 } 7287 if ((mPrivateFlags2 & PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED) == 0) { 7288 mPrivateFlags2 |= PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; 7289 if (mParent != null) { 7290 try { 7291 mParent.notifySubtreeAccessibilityStateChanged( 7292 this, this, AccessibilityEvent.CONTENT_CHANGE_TYPE_SUBTREE); 7293 } catch (AbstractMethodError e) { 7294 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 7295 " does not fully implement ViewParent", e); 7296 } 7297 } 7298 } 7299 } 7300 7301 /** 7302 * Reset the flag indicating the accessibility state of the subtree rooted 7303 * at this view changed. 7304 */ 7305 void resetSubtreeAccessibilityStateChanged() { 7306 mPrivateFlags2 &= ~PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; 7307 } 7308 7309 /** 7310 * Performs the specified accessibility action on the view. For 7311 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 7312 * <p> 7313 * If an {@link AccessibilityDelegate} has been specified via calling 7314 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 7315 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 7316 * is responsible for handling this call. 7317 * </p> 7318 * 7319 * @param action The action to perform. 7320 * @param arguments Optional action arguments. 7321 * @return Whether the action was performed. 7322 */ 7323 public boolean performAccessibilityAction(int action, Bundle arguments) { 7324 if (mAccessibilityDelegate != null) { 7325 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 7326 } else { 7327 return performAccessibilityActionInternal(action, arguments); 7328 } 7329 } 7330 7331 /** 7332 * @see #performAccessibilityAction(int, Bundle) 7333 * 7334 * Note: Called from the default {@link AccessibilityDelegate}. 7335 */ 7336 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 7337 switch (action) { 7338 case AccessibilityNodeInfo.ACTION_CLICK: { 7339 if (isClickable()) { 7340 performClick(); 7341 return true; 7342 } 7343 } break; 7344 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 7345 if (isLongClickable()) { 7346 performLongClick(); 7347 return true; 7348 } 7349 } break; 7350 case AccessibilityNodeInfo.ACTION_FOCUS: { 7351 if (!hasFocus()) { 7352 // Get out of touch mode since accessibility 7353 // wants to move focus around. 7354 getViewRootImpl().ensureTouchMode(false); 7355 return requestFocus(); 7356 } 7357 } break; 7358 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 7359 if (hasFocus()) { 7360 clearFocus(); 7361 return !isFocused(); 7362 } 7363 } break; 7364 case AccessibilityNodeInfo.ACTION_SELECT: { 7365 if (!isSelected()) { 7366 setSelected(true); 7367 return isSelected(); 7368 } 7369 } break; 7370 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 7371 if (isSelected()) { 7372 setSelected(false); 7373 return !isSelected(); 7374 } 7375 } break; 7376 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 7377 if (!isAccessibilityFocused()) { 7378 return requestAccessibilityFocus(); 7379 } 7380 } break; 7381 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 7382 if (isAccessibilityFocused()) { 7383 clearAccessibilityFocus(); 7384 return true; 7385 } 7386 } break; 7387 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 7388 if (arguments != null) { 7389 final int granularity = arguments.getInt( 7390 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7391 final boolean extendSelection = arguments.getBoolean( 7392 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7393 return traverseAtGranularity(granularity, true, extendSelection); 7394 } 7395 } break; 7396 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 7397 if (arguments != null) { 7398 final int granularity = arguments.getInt( 7399 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7400 final boolean extendSelection = arguments.getBoolean( 7401 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7402 return traverseAtGranularity(granularity, false, extendSelection); 7403 } 7404 } break; 7405 case AccessibilityNodeInfo.ACTION_SET_SELECTION: { 7406 CharSequence text = getIterableTextForAccessibility(); 7407 if (text == null) { 7408 return false; 7409 } 7410 final int start = (arguments != null) ? arguments.getInt( 7411 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, -1) : -1; 7412 final int end = (arguments != null) ? arguments.getInt( 7413 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, -1) : -1; 7414 // Only cursor position can be specified (selection length == 0) 7415 if ((getAccessibilitySelectionStart() != start 7416 || getAccessibilitySelectionEnd() != end) 7417 && (start == end)) { 7418 setAccessibilitySelection(start, end); 7419 notifyViewAccessibilityStateChangedIfNeeded( 7420 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 7421 return true; 7422 } 7423 } break; 7424 } 7425 return false; 7426 } 7427 7428 private boolean traverseAtGranularity(int granularity, boolean forward, 7429 boolean extendSelection) { 7430 CharSequence text = getIterableTextForAccessibility(); 7431 if (text == null || text.length() == 0) { 7432 return false; 7433 } 7434 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 7435 if (iterator == null) { 7436 return false; 7437 } 7438 int current = getAccessibilitySelectionEnd(); 7439 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7440 current = forward ? 0 : text.length(); 7441 } 7442 final int[] range = forward ? iterator.following(current) : iterator.preceding(current); 7443 if (range == null) { 7444 return false; 7445 } 7446 final int segmentStart = range[0]; 7447 final int segmentEnd = range[1]; 7448 int selectionStart; 7449 int selectionEnd; 7450 if (extendSelection && isAccessibilitySelectionExtendable()) { 7451 selectionStart = getAccessibilitySelectionStart(); 7452 if (selectionStart == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7453 selectionStart = forward ? segmentStart : segmentEnd; 7454 } 7455 selectionEnd = forward ? segmentEnd : segmentStart; 7456 } else { 7457 selectionStart = selectionEnd= forward ? segmentEnd : segmentStart; 7458 } 7459 setAccessibilitySelection(selectionStart, selectionEnd); 7460 final int action = forward ? AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY 7461 : AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY; 7462 sendViewTextTraversedAtGranularityEvent(action, granularity, segmentStart, segmentEnd); 7463 return true; 7464 } 7465 7466 /** 7467 * Gets the text reported for accessibility purposes. 7468 * 7469 * @return The accessibility text. 7470 * 7471 * @hide 7472 */ 7473 public CharSequence getIterableTextForAccessibility() { 7474 return getContentDescription(); 7475 } 7476 7477 /** 7478 * Gets whether accessibility selection can be extended. 7479 * 7480 * @return If selection is extensible. 7481 * 7482 * @hide 7483 */ 7484 public boolean isAccessibilitySelectionExtendable() { 7485 return false; 7486 } 7487 7488 /** 7489 * @hide 7490 */ 7491 public int getAccessibilitySelectionStart() { 7492 return mAccessibilityCursorPosition; 7493 } 7494 7495 /** 7496 * @hide 7497 */ 7498 public int getAccessibilitySelectionEnd() { 7499 return getAccessibilitySelectionStart(); 7500 } 7501 7502 /** 7503 * @hide 7504 */ 7505 public void setAccessibilitySelection(int start, int end) { 7506 if (start == end && end == mAccessibilityCursorPosition) { 7507 return; 7508 } 7509 if (start >= 0 && start == end && end <= getIterableTextForAccessibility().length()) { 7510 mAccessibilityCursorPosition = start; 7511 } else { 7512 mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 7513 } 7514 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED); 7515 } 7516 7517 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 7518 int fromIndex, int toIndex) { 7519 if (mParent == null) { 7520 return; 7521 } 7522 AccessibilityEvent event = AccessibilityEvent.obtain( 7523 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 7524 onInitializeAccessibilityEvent(event); 7525 onPopulateAccessibilityEvent(event); 7526 event.setFromIndex(fromIndex); 7527 event.setToIndex(toIndex); 7528 event.setAction(action); 7529 event.setMovementGranularity(granularity); 7530 mParent.requestSendAccessibilityEvent(this, event); 7531 } 7532 7533 /** 7534 * @hide 7535 */ 7536 public TextSegmentIterator getIteratorForGranularity(int granularity) { 7537 switch (granularity) { 7538 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 7539 CharSequence text = getIterableTextForAccessibility(); 7540 if (text != null && text.length() > 0) { 7541 CharacterTextSegmentIterator iterator = 7542 CharacterTextSegmentIterator.getInstance( 7543 mContext.getResources().getConfiguration().locale); 7544 iterator.initialize(text.toString()); 7545 return iterator; 7546 } 7547 } break; 7548 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 7549 CharSequence text = getIterableTextForAccessibility(); 7550 if (text != null && text.length() > 0) { 7551 WordTextSegmentIterator iterator = 7552 WordTextSegmentIterator.getInstance( 7553 mContext.getResources().getConfiguration().locale); 7554 iterator.initialize(text.toString()); 7555 return iterator; 7556 } 7557 } break; 7558 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 7559 CharSequence text = getIterableTextForAccessibility(); 7560 if (text != null && text.length() > 0) { 7561 ParagraphTextSegmentIterator iterator = 7562 ParagraphTextSegmentIterator.getInstance(); 7563 iterator.initialize(text.toString()); 7564 return iterator; 7565 } 7566 } break; 7567 } 7568 return null; 7569 } 7570 7571 /** 7572 * @hide 7573 */ 7574 public void dispatchStartTemporaryDetach() { 7575 clearDisplayList(); 7576 7577 onStartTemporaryDetach(); 7578 } 7579 7580 /** 7581 * This is called when a container is going to temporarily detach a child, with 7582 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 7583 * It will either be followed by {@link #onFinishTemporaryDetach()} or 7584 * {@link #onDetachedFromWindow()} when the container is done. 7585 */ 7586 public void onStartTemporaryDetach() { 7587 removeUnsetPressCallback(); 7588 mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT; 7589 } 7590 7591 /** 7592 * @hide 7593 */ 7594 public void dispatchFinishTemporaryDetach() { 7595 onFinishTemporaryDetach(); 7596 } 7597 7598 /** 7599 * Called after {@link #onStartTemporaryDetach} when the container is done 7600 * changing the view. 7601 */ 7602 public void onFinishTemporaryDetach() { 7603 } 7604 7605 /** 7606 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 7607 * for this view's window. Returns null if the view is not currently attached 7608 * to the window. Normally you will not need to use this directly, but 7609 * just use the standard high-level event callbacks like 7610 * {@link #onKeyDown(int, KeyEvent)}. 7611 */ 7612 public KeyEvent.DispatcherState getKeyDispatcherState() { 7613 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 7614 } 7615 7616 /** 7617 * Dispatch a key event before it is processed by any input method 7618 * associated with the view hierarchy. This can be used to intercept 7619 * key events in special situations before the IME consumes them; a 7620 * typical example would be handling the BACK key to update the application's 7621 * UI instead of allowing the IME to see it and close itself. 7622 * 7623 * @param event The key event to be dispatched. 7624 * @return True if the event was handled, false otherwise. 7625 */ 7626 public boolean dispatchKeyEventPreIme(KeyEvent event) { 7627 return onKeyPreIme(event.getKeyCode(), event); 7628 } 7629 7630 /** 7631 * Dispatch a key event to the next view on the focus path. This path runs 7632 * from the top of the view tree down to the currently focused view. If this 7633 * view has focus, it will dispatch to itself. Otherwise it will dispatch 7634 * the next node down the focus path. This method also fires any key 7635 * listeners. 7636 * 7637 * @param event The key event to be dispatched. 7638 * @return True if the event was handled, false otherwise. 7639 */ 7640 public boolean dispatchKeyEvent(KeyEvent event) { 7641 if (mInputEventConsistencyVerifier != null) { 7642 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 7643 } 7644 7645 // Give any attached key listener a first crack at the event. 7646 //noinspection SimplifiableIfStatement 7647 ListenerInfo li = mListenerInfo; 7648 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7649 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 7650 return true; 7651 } 7652 7653 if (event.dispatch(this, mAttachInfo != null 7654 ? mAttachInfo.mKeyDispatchState : null, this)) { 7655 return true; 7656 } 7657 7658 if (mInputEventConsistencyVerifier != null) { 7659 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7660 } 7661 return false; 7662 } 7663 7664 /** 7665 * Dispatches a key shortcut event. 7666 * 7667 * @param event The key event to be dispatched. 7668 * @return True if the event was handled by the view, false otherwise. 7669 */ 7670 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 7671 return onKeyShortcut(event.getKeyCode(), event); 7672 } 7673 7674 /** 7675 * Pass the touch screen motion event down to the target view, or this 7676 * view if it is the target. 7677 * 7678 * @param event The motion event to be dispatched. 7679 * @return True if the event was handled by the view, false otherwise. 7680 */ 7681 public boolean dispatchTouchEvent(MotionEvent event) { 7682 if (mInputEventConsistencyVerifier != null) { 7683 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 7684 } 7685 7686 if (onFilterTouchEventForSecurity(event)) { 7687 //noinspection SimplifiableIfStatement 7688 ListenerInfo li = mListenerInfo; 7689 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7690 && li.mOnTouchListener.onTouch(this, event)) { 7691 return true; 7692 } 7693 7694 if (onTouchEvent(event)) { 7695 return true; 7696 } 7697 } 7698 7699 if (mInputEventConsistencyVerifier != null) { 7700 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7701 } 7702 return false; 7703 } 7704 7705 /** 7706 * Filter the touch event to apply security policies. 7707 * 7708 * @param event The motion event to be filtered. 7709 * @return True if the event should be dispatched, false if the event should be dropped. 7710 * 7711 * @see #getFilterTouchesWhenObscured 7712 */ 7713 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 7714 //noinspection RedundantIfStatement 7715 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 7716 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 7717 // Window is obscured, drop this touch. 7718 return false; 7719 } 7720 return true; 7721 } 7722 7723 /** 7724 * Pass a trackball motion event down to the focused view. 7725 * 7726 * @param event The motion event to be dispatched. 7727 * @return True if the event was handled by the view, false otherwise. 7728 */ 7729 public boolean dispatchTrackballEvent(MotionEvent event) { 7730 if (mInputEventConsistencyVerifier != null) { 7731 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 7732 } 7733 7734 return onTrackballEvent(event); 7735 } 7736 7737 /** 7738 * Dispatch a generic motion event. 7739 * <p> 7740 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7741 * are delivered to the view under the pointer. All other generic motion events are 7742 * delivered to the focused view. Hover events are handled specially and are delivered 7743 * to {@link #onHoverEvent(MotionEvent)}. 7744 * </p> 7745 * 7746 * @param event The motion event to be dispatched. 7747 * @return True if the event was handled by the view, false otherwise. 7748 */ 7749 public boolean dispatchGenericMotionEvent(MotionEvent event) { 7750 if (mInputEventConsistencyVerifier != null) { 7751 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 7752 } 7753 7754 final int source = event.getSource(); 7755 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7756 final int action = event.getAction(); 7757 if (action == MotionEvent.ACTION_HOVER_ENTER 7758 || action == MotionEvent.ACTION_HOVER_MOVE 7759 || action == MotionEvent.ACTION_HOVER_EXIT) { 7760 if (dispatchHoverEvent(event)) { 7761 return true; 7762 } 7763 } else if (dispatchGenericPointerEvent(event)) { 7764 return true; 7765 } 7766 } else if (dispatchGenericFocusedEvent(event)) { 7767 return true; 7768 } 7769 7770 if (dispatchGenericMotionEventInternal(event)) { 7771 return true; 7772 } 7773 7774 if (mInputEventConsistencyVerifier != null) { 7775 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7776 } 7777 return false; 7778 } 7779 7780 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 7781 //noinspection SimplifiableIfStatement 7782 ListenerInfo li = mListenerInfo; 7783 if (li != null && li.mOnGenericMotionListener != null 7784 && (mViewFlags & ENABLED_MASK) == ENABLED 7785 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 7786 return true; 7787 } 7788 7789 if (onGenericMotionEvent(event)) { 7790 return true; 7791 } 7792 7793 if (mInputEventConsistencyVerifier != null) { 7794 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7795 } 7796 return false; 7797 } 7798 7799 /** 7800 * Dispatch a hover event. 7801 * <p> 7802 * Do not call this method directly. 7803 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7804 * </p> 7805 * 7806 * @param event The motion event to be dispatched. 7807 * @return True if the event was handled by the view, false otherwise. 7808 */ 7809 protected boolean dispatchHoverEvent(MotionEvent event) { 7810 ListenerInfo li = mListenerInfo; 7811 //noinspection SimplifiableIfStatement 7812 if (li != null && li.mOnHoverListener != null 7813 && (mViewFlags & ENABLED_MASK) == ENABLED 7814 && li.mOnHoverListener.onHover(this, event)) { 7815 return true; 7816 } 7817 7818 return onHoverEvent(event); 7819 } 7820 7821 /** 7822 * Returns true if the view has a child to which it has recently sent 7823 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7824 * it does not have a hovered child, then it must be the innermost hovered view. 7825 * @hide 7826 */ 7827 protected boolean hasHoveredChild() { 7828 return false; 7829 } 7830 7831 /** 7832 * Dispatch a generic motion event to the view under the first pointer. 7833 * <p> 7834 * Do not call this method directly. 7835 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7836 * </p> 7837 * 7838 * @param event The motion event to be dispatched. 7839 * @return True if the event was handled by the view, false otherwise. 7840 */ 7841 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7842 return false; 7843 } 7844 7845 /** 7846 * Dispatch a generic motion event to the currently focused view. 7847 * <p> 7848 * Do not call this method directly. 7849 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7850 * </p> 7851 * 7852 * @param event The motion event to be dispatched. 7853 * @return True if the event was handled by the view, false otherwise. 7854 */ 7855 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7856 return false; 7857 } 7858 7859 /** 7860 * Dispatch a pointer event. 7861 * <p> 7862 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7863 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7864 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7865 * and should not be expected to handle other pointing device features. 7866 * </p> 7867 * 7868 * @param event The motion event to be dispatched. 7869 * @return True if the event was handled by the view, false otherwise. 7870 * @hide 7871 */ 7872 public final boolean dispatchPointerEvent(MotionEvent event) { 7873 if (event.isTouchEvent()) { 7874 return dispatchTouchEvent(event); 7875 } else { 7876 return dispatchGenericMotionEvent(event); 7877 } 7878 } 7879 7880 /** 7881 * Called when the window containing this view gains or loses window focus. 7882 * ViewGroups should override to route to their children. 7883 * 7884 * @param hasFocus True if the window containing this view now has focus, 7885 * false otherwise. 7886 */ 7887 public void dispatchWindowFocusChanged(boolean hasFocus) { 7888 onWindowFocusChanged(hasFocus); 7889 } 7890 7891 /** 7892 * Called when the window containing this view gains or loses focus. Note 7893 * that this is separate from view focus: to receive key events, both 7894 * your view and its window must have focus. If a window is displayed 7895 * on top of yours that takes input focus, then your own window will lose 7896 * focus but the view focus will remain unchanged. 7897 * 7898 * @param hasWindowFocus True if the window containing this view now has 7899 * focus, false otherwise. 7900 */ 7901 public void onWindowFocusChanged(boolean hasWindowFocus) { 7902 InputMethodManager imm = InputMethodManager.peekInstance(); 7903 if (!hasWindowFocus) { 7904 if (isPressed()) { 7905 setPressed(false); 7906 } 7907 if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7908 imm.focusOut(this); 7909 } 7910 removeLongPressCallback(); 7911 removeTapCallback(); 7912 onFocusLost(); 7913 } else if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7914 imm.focusIn(this); 7915 } 7916 refreshDrawableState(); 7917 } 7918 7919 /** 7920 * Returns true if this view is in a window that currently has window focus. 7921 * Note that this is not the same as the view itself having focus. 7922 * 7923 * @return True if this view is in a window that currently has window focus. 7924 */ 7925 public boolean hasWindowFocus() { 7926 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7927 } 7928 7929 /** 7930 * Dispatch a view visibility change down the view hierarchy. 7931 * ViewGroups should override to route to their children. 7932 * @param changedView The view whose visibility changed. Could be 'this' or 7933 * an ancestor view. 7934 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7935 * {@link #INVISIBLE} or {@link #GONE}. 7936 */ 7937 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7938 onVisibilityChanged(changedView, visibility); 7939 } 7940 7941 /** 7942 * Called when the visibility of the view or an ancestor of the view is changed. 7943 * @param changedView The view whose visibility changed. Could be 'this' or 7944 * an ancestor view. 7945 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7946 * {@link #INVISIBLE} or {@link #GONE}. 7947 */ 7948 protected void onVisibilityChanged(View changedView, int visibility) { 7949 if (visibility == VISIBLE) { 7950 if (mAttachInfo != null) { 7951 initialAwakenScrollBars(); 7952 } else { 7953 mPrivateFlags |= PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 7954 } 7955 } 7956 } 7957 7958 /** 7959 * Dispatch a hint about whether this view is displayed. For instance, when 7960 * a View moves out of the screen, it might receives a display hint indicating 7961 * the view is not displayed. Applications should not <em>rely</em> on this hint 7962 * as there is no guarantee that they will receive one. 7963 * 7964 * @param hint A hint about whether or not this view is displayed: 7965 * {@link #VISIBLE} or {@link #INVISIBLE}. 7966 */ 7967 public void dispatchDisplayHint(int hint) { 7968 onDisplayHint(hint); 7969 } 7970 7971 /** 7972 * Gives this view a hint about whether is displayed or not. For instance, when 7973 * a View moves out of the screen, it might receives a display hint indicating 7974 * the view is not displayed. Applications should not <em>rely</em> on this hint 7975 * as there is no guarantee that they will receive one. 7976 * 7977 * @param hint A hint about whether or not this view is displayed: 7978 * {@link #VISIBLE} or {@link #INVISIBLE}. 7979 */ 7980 protected void onDisplayHint(int hint) { 7981 } 7982 7983 /** 7984 * Dispatch a window visibility change down the view hierarchy. 7985 * ViewGroups should override to route to their children. 7986 * 7987 * @param visibility The new visibility of the window. 7988 * 7989 * @see #onWindowVisibilityChanged(int) 7990 */ 7991 public void dispatchWindowVisibilityChanged(int visibility) { 7992 onWindowVisibilityChanged(visibility); 7993 } 7994 7995 /** 7996 * Called when the window containing has change its visibility 7997 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7998 * that this tells you whether or not your window is being made visible 7999 * to the window manager; this does <em>not</em> tell you whether or not 8000 * your window is obscured by other windows on the screen, even if it 8001 * is itself visible. 8002 * 8003 * @param visibility The new visibility of the window. 8004 */ 8005 protected void onWindowVisibilityChanged(int visibility) { 8006 if (visibility == VISIBLE) { 8007 initialAwakenScrollBars(); 8008 } 8009 } 8010 8011 /** 8012 * Returns the current visibility of the window this view is attached to 8013 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 8014 * 8015 * @return Returns the current visibility of the view's window. 8016 */ 8017 public int getWindowVisibility() { 8018 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 8019 } 8020 8021 /** 8022 * Retrieve the overall visible display size in which the window this view is 8023 * attached to has been positioned in. This takes into account screen 8024 * decorations above the window, for both cases where the window itself 8025 * is being position inside of them or the window is being placed under 8026 * then and covered insets are used for the window to position its content 8027 * inside. In effect, this tells you the available area where content can 8028 * be placed and remain visible to users. 8029 * 8030 * <p>This function requires an IPC back to the window manager to retrieve 8031 * the requested information, so should not be used in performance critical 8032 * code like drawing. 8033 * 8034 * @param outRect Filled in with the visible display frame. If the view 8035 * is not attached to a window, this is simply the raw display size. 8036 */ 8037 public void getWindowVisibleDisplayFrame(Rect outRect) { 8038 if (mAttachInfo != null) { 8039 try { 8040 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 8041 } catch (RemoteException e) { 8042 return; 8043 } 8044 // XXX This is really broken, and probably all needs to be done 8045 // in the window manager, and we need to know more about whether 8046 // we want the area behind or in front of the IME. 8047 final Rect insets = mAttachInfo.mVisibleInsets; 8048 outRect.left += insets.left; 8049 outRect.top += insets.top; 8050 outRect.right -= insets.right; 8051 outRect.bottom -= insets.bottom; 8052 return; 8053 } 8054 // The view is not attached to a display so we don't have a context. 8055 // Make a best guess about the display size. 8056 Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY); 8057 d.getRectSize(outRect); 8058 } 8059 8060 /** 8061 * Dispatch a notification about a resource configuration change down 8062 * the view hierarchy. 8063 * ViewGroups should override to route to their children. 8064 * 8065 * @param newConfig The new resource configuration. 8066 * 8067 * @see #onConfigurationChanged(android.content.res.Configuration) 8068 */ 8069 public void dispatchConfigurationChanged(Configuration newConfig) { 8070 onConfigurationChanged(newConfig); 8071 } 8072 8073 /** 8074 * Called when the current configuration of the resources being used 8075 * by the application have changed. You can use this to decide when 8076 * to reload resources that can changed based on orientation and other 8077 * configuration characterstics. You only need to use this if you are 8078 * not relying on the normal {@link android.app.Activity} mechanism of 8079 * recreating the activity instance upon a configuration change. 8080 * 8081 * @param newConfig The new resource configuration. 8082 */ 8083 protected void onConfigurationChanged(Configuration newConfig) { 8084 } 8085 8086 /** 8087 * Private function to aggregate all per-view attributes in to the view 8088 * root. 8089 */ 8090 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 8091 performCollectViewAttributes(attachInfo, visibility); 8092 } 8093 8094 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 8095 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 8096 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 8097 attachInfo.mKeepScreenOn = true; 8098 } 8099 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 8100 ListenerInfo li = mListenerInfo; 8101 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 8102 attachInfo.mHasSystemUiListeners = true; 8103 } 8104 } 8105 } 8106 8107 void needGlobalAttributesUpdate(boolean force) { 8108 final AttachInfo ai = mAttachInfo; 8109 if (ai != null && !ai.mRecomputeGlobalAttributes) { 8110 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 8111 || ai.mHasSystemUiListeners) { 8112 ai.mRecomputeGlobalAttributes = true; 8113 } 8114 } 8115 } 8116 8117 /** 8118 * Returns whether the device is currently in touch mode. Touch mode is entered 8119 * once the user begins interacting with the device by touch, and affects various 8120 * things like whether focus is always visible to the user. 8121 * 8122 * @return Whether the device is in touch mode. 8123 */ 8124 @ViewDebug.ExportedProperty 8125 public boolean isInTouchMode() { 8126 if (mAttachInfo != null) { 8127 return mAttachInfo.mInTouchMode; 8128 } else { 8129 return ViewRootImpl.isInTouchMode(); 8130 } 8131 } 8132 8133 /** 8134 * Returns the context the view is running in, through which it can 8135 * access the current theme, resources, etc. 8136 * 8137 * @return The view's Context. 8138 */ 8139 @ViewDebug.CapturedViewProperty 8140 public final Context getContext() { 8141 return mContext; 8142 } 8143 8144 /** 8145 * Handle a key event before it is processed by any input method 8146 * associated with the view hierarchy. This can be used to intercept 8147 * key events in special situations before the IME consumes them; a 8148 * typical example would be handling the BACK key to update the application's 8149 * UI instead of allowing the IME to see it and close itself. 8150 * 8151 * @param keyCode The value in event.getKeyCode(). 8152 * @param event Description of the key event. 8153 * @return If you handled the event, return true. If you want to allow the 8154 * event to be handled by the next receiver, return false. 8155 */ 8156 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 8157 return false; 8158 } 8159 8160 /** 8161 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 8162 * KeyEvent.Callback.onKeyDown()}: perform press of the view 8163 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 8164 * is released, if the view is enabled and clickable. 8165 * 8166 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8167 * although some may elect to do so in some situations. Do not rely on this to 8168 * catch software key presses. 8169 * 8170 * @param keyCode A key code that represents the button pressed, from 8171 * {@link android.view.KeyEvent}. 8172 * @param event The KeyEvent object that defines the button action. 8173 */ 8174 public boolean onKeyDown(int keyCode, KeyEvent event) { 8175 boolean result = false; 8176 8177 if (KeyEvent.isConfirmKey(keyCode)) { 8178 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 8179 return true; 8180 } 8181 // Long clickable items don't necessarily have to be clickable 8182 if (((mViewFlags & CLICKABLE) == CLICKABLE || 8183 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 8184 (event.getRepeatCount() == 0)) { 8185 setPressed(true); 8186 checkForLongClick(0); 8187 return true; 8188 } 8189 } 8190 return result; 8191 } 8192 8193 /** 8194 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 8195 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 8196 * the event). 8197 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8198 * although some may elect to do so in some situations. Do not rely on this to 8199 * catch software key presses. 8200 */ 8201 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 8202 return false; 8203 } 8204 8205 /** 8206 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 8207 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 8208 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 8209 * {@link KeyEvent#KEYCODE_ENTER} is released. 8210 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8211 * although some may elect to do so in some situations. Do not rely on this to 8212 * catch software key presses. 8213 * 8214 * @param keyCode A key code that represents the button pressed, from 8215 * {@link android.view.KeyEvent}. 8216 * @param event The KeyEvent object that defines the button action. 8217 */ 8218 public boolean onKeyUp(int keyCode, KeyEvent event) { 8219 if (KeyEvent.isConfirmKey(keyCode)) { 8220 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 8221 return true; 8222 } 8223 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 8224 setPressed(false); 8225 8226 if (!mHasPerformedLongPress) { 8227 // This is a tap, so remove the longpress check 8228 removeLongPressCallback(); 8229 return performClick(); 8230 } 8231 } 8232 } 8233 return false; 8234 } 8235 8236 /** 8237 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 8238 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 8239 * the event). 8240 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8241 * although some may elect to do so in some situations. Do not rely on this to 8242 * catch software key presses. 8243 * 8244 * @param keyCode A key code that represents the button pressed, from 8245 * {@link android.view.KeyEvent}. 8246 * @param repeatCount The number of times the action was made. 8247 * @param event The KeyEvent object that defines the button action. 8248 */ 8249 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 8250 return false; 8251 } 8252 8253 /** 8254 * Called on the focused view when a key shortcut event is not handled. 8255 * Override this method to implement local key shortcuts for the View. 8256 * Key shortcuts can also be implemented by setting the 8257 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 8258 * 8259 * @param keyCode The value in event.getKeyCode(). 8260 * @param event Description of the key event. 8261 * @return If you handled the event, return true. If you want to allow the 8262 * event to be handled by the next receiver, return false. 8263 */ 8264 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 8265 return false; 8266 } 8267 8268 /** 8269 * Check whether the called view is a text editor, in which case it 8270 * would make sense to automatically display a soft input window for 8271 * it. Subclasses should override this if they implement 8272 * {@link #onCreateInputConnection(EditorInfo)} to return true if 8273 * a call on that method would return a non-null InputConnection, and 8274 * they are really a first-class editor that the user would normally 8275 * start typing on when the go into a window containing your view. 8276 * 8277 * <p>The default implementation always returns false. This does 8278 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 8279 * will not be called or the user can not otherwise perform edits on your 8280 * view; it is just a hint to the system that this is not the primary 8281 * purpose of this view. 8282 * 8283 * @return Returns true if this view is a text editor, else false. 8284 */ 8285 public boolean onCheckIsTextEditor() { 8286 return false; 8287 } 8288 8289 /** 8290 * Create a new InputConnection for an InputMethod to interact 8291 * with the view. The default implementation returns null, since it doesn't 8292 * support input methods. You can override this to implement such support. 8293 * This is only needed for views that take focus and text input. 8294 * 8295 * <p>When implementing this, you probably also want to implement 8296 * {@link #onCheckIsTextEditor()} to indicate you will return a 8297 * non-null InputConnection. 8298 * 8299 * @param outAttrs Fill in with attribute information about the connection. 8300 */ 8301 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 8302 return null; 8303 } 8304 8305 /** 8306 * Called by the {@link android.view.inputmethod.InputMethodManager} 8307 * when a view who is not the current 8308 * input connection target is trying to make a call on the manager. The 8309 * default implementation returns false; you can override this to return 8310 * true for certain views if you are performing InputConnection proxying 8311 * to them. 8312 * @param view The View that is making the InputMethodManager call. 8313 * @return Return true to allow the call, false to reject. 8314 */ 8315 public boolean checkInputConnectionProxy(View view) { 8316 return false; 8317 } 8318 8319 /** 8320 * Show the context menu for this view. It is not safe to hold on to the 8321 * menu after returning from this method. 8322 * 8323 * You should normally not overload this method. Overload 8324 * {@link #onCreateContextMenu(ContextMenu)} or define an 8325 * {@link OnCreateContextMenuListener} to add items to the context menu. 8326 * 8327 * @param menu The context menu to populate 8328 */ 8329 public void createContextMenu(ContextMenu menu) { 8330 ContextMenuInfo menuInfo = getContextMenuInfo(); 8331 8332 // Sets the current menu info so all items added to menu will have 8333 // my extra info set. 8334 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 8335 8336 onCreateContextMenu(menu); 8337 ListenerInfo li = mListenerInfo; 8338 if (li != null && li.mOnCreateContextMenuListener != null) { 8339 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 8340 } 8341 8342 // Clear the extra information so subsequent items that aren't mine don't 8343 // have my extra info. 8344 ((MenuBuilder)menu).setCurrentMenuInfo(null); 8345 8346 if (mParent != null) { 8347 mParent.createContextMenu(menu); 8348 } 8349 } 8350 8351 /** 8352 * Views should implement this if they have extra information to associate 8353 * with the context menu. The return result is supplied as a parameter to 8354 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 8355 * callback. 8356 * 8357 * @return Extra information about the item for which the context menu 8358 * should be shown. This information will vary across different 8359 * subclasses of View. 8360 */ 8361 protected ContextMenuInfo getContextMenuInfo() { 8362 return null; 8363 } 8364 8365 /** 8366 * Views should implement this if the view itself is going to add items to 8367 * the context menu. 8368 * 8369 * @param menu the context menu to populate 8370 */ 8371 protected void onCreateContextMenu(ContextMenu menu) { 8372 } 8373 8374 /** 8375 * Implement this method to handle trackball motion events. The 8376 * <em>relative</em> movement of the trackball since the last event 8377 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 8378 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 8379 * that a movement of 1 corresponds to the user pressing one DPAD key (so 8380 * they will often be fractional values, representing the more fine-grained 8381 * movement information available from a trackball). 8382 * 8383 * @param event The motion event. 8384 * @return True if the event was handled, false otherwise. 8385 */ 8386 public boolean onTrackballEvent(MotionEvent event) { 8387 return false; 8388 } 8389 8390 /** 8391 * Implement this method to handle generic motion events. 8392 * <p> 8393 * Generic motion events describe joystick movements, mouse hovers, track pad 8394 * touches, scroll wheel movements and other input events. The 8395 * {@link MotionEvent#getSource() source} of the motion event specifies 8396 * the class of input that was received. Implementations of this method 8397 * must examine the bits in the source before processing the event. 8398 * The following code example shows how this is done. 8399 * </p><p> 8400 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 8401 * are delivered to the view under the pointer. All other generic motion events are 8402 * delivered to the focused view. 8403 * </p> 8404 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 8405 * if (event.isFromSource(InputDevice.SOURCE_CLASS_JOYSTICK)) { 8406 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 8407 * // process the joystick movement... 8408 * return true; 8409 * } 8410 * } 8411 * if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) { 8412 * switch (event.getAction()) { 8413 * case MotionEvent.ACTION_HOVER_MOVE: 8414 * // process the mouse hover movement... 8415 * return true; 8416 * case MotionEvent.ACTION_SCROLL: 8417 * // process the scroll wheel movement... 8418 * return true; 8419 * } 8420 * } 8421 * return super.onGenericMotionEvent(event); 8422 * }</pre> 8423 * 8424 * @param event The generic motion event being processed. 8425 * @return True if the event was handled, false otherwise. 8426 */ 8427 public boolean onGenericMotionEvent(MotionEvent event) { 8428 return false; 8429 } 8430 8431 /** 8432 * Implement this method to handle hover events. 8433 * <p> 8434 * This method is called whenever a pointer is hovering into, over, or out of the 8435 * bounds of a view and the view is not currently being touched. 8436 * Hover events are represented as pointer events with action 8437 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 8438 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 8439 * </p> 8440 * <ul> 8441 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 8442 * when the pointer enters the bounds of the view.</li> 8443 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 8444 * when the pointer has already entered the bounds of the view and has moved.</li> 8445 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 8446 * when the pointer has exited the bounds of the view or when the pointer is 8447 * about to go down due to a button click, tap, or similar user action that 8448 * causes the view to be touched.</li> 8449 * </ul> 8450 * <p> 8451 * The view should implement this method to return true to indicate that it is 8452 * handling the hover event, such as by changing its drawable state. 8453 * </p><p> 8454 * The default implementation calls {@link #setHovered} to update the hovered state 8455 * of the view when a hover enter or hover exit event is received, if the view 8456 * is enabled and is clickable. The default implementation also sends hover 8457 * accessibility events. 8458 * </p> 8459 * 8460 * @param event The motion event that describes the hover. 8461 * @return True if the view handled the hover event. 8462 * 8463 * @see #isHovered 8464 * @see #setHovered 8465 * @see #onHoverChanged 8466 */ 8467 public boolean onHoverEvent(MotionEvent event) { 8468 // The root view may receive hover (or touch) events that are outside the bounds of 8469 // the window. This code ensures that we only send accessibility events for 8470 // hovers that are actually within the bounds of the root view. 8471 final int action = event.getActionMasked(); 8472 if (!mSendingHoverAccessibilityEvents) { 8473 if ((action == MotionEvent.ACTION_HOVER_ENTER 8474 || action == MotionEvent.ACTION_HOVER_MOVE) 8475 && !hasHoveredChild() 8476 && pointInView(event.getX(), event.getY())) { 8477 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 8478 mSendingHoverAccessibilityEvents = true; 8479 } 8480 } else { 8481 if (action == MotionEvent.ACTION_HOVER_EXIT 8482 || (action == MotionEvent.ACTION_MOVE 8483 && !pointInView(event.getX(), event.getY()))) { 8484 mSendingHoverAccessibilityEvents = false; 8485 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 8486 // If the window does not have input focus we take away accessibility 8487 // focus as soon as the user stop hovering over the view. 8488 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 8489 getViewRootImpl().setAccessibilityFocus(null, null); 8490 } 8491 } 8492 } 8493 8494 if (isHoverable()) { 8495 switch (action) { 8496 case MotionEvent.ACTION_HOVER_ENTER: 8497 setHovered(true); 8498 break; 8499 case MotionEvent.ACTION_HOVER_EXIT: 8500 setHovered(false); 8501 break; 8502 } 8503 8504 // Dispatch the event to onGenericMotionEvent before returning true. 8505 // This is to provide compatibility with existing applications that 8506 // handled HOVER_MOVE events in onGenericMotionEvent and that would 8507 // break because of the new default handling for hoverable views 8508 // in onHoverEvent. 8509 // Note that onGenericMotionEvent will be called by default when 8510 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 8511 dispatchGenericMotionEventInternal(event); 8512 // The event was already handled by calling setHovered(), so always 8513 // return true. 8514 return true; 8515 } 8516 8517 return false; 8518 } 8519 8520 /** 8521 * Returns true if the view should handle {@link #onHoverEvent} 8522 * by calling {@link #setHovered} to change its hovered state. 8523 * 8524 * @return True if the view is hoverable. 8525 */ 8526 private boolean isHoverable() { 8527 final int viewFlags = mViewFlags; 8528 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8529 return false; 8530 } 8531 8532 return (viewFlags & CLICKABLE) == CLICKABLE 8533 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 8534 } 8535 8536 /** 8537 * Returns true if the view is currently hovered. 8538 * 8539 * @return True if the view is currently hovered. 8540 * 8541 * @see #setHovered 8542 * @see #onHoverChanged 8543 */ 8544 @ViewDebug.ExportedProperty 8545 public boolean isHovered() { 8546 return (mPrivateFlags & PFLAG_HOVERED) != 0; 8547 } 8548 8549 /** 8550 * Sets whether the view is currently hovered. 8551 * <p> 8552 * Calling this method also changes the drawable state of the view. This 8553 * enables the view to react to hover by using different drawable resources 8554 * to change its appearance. 8555 * </p><p> 8556 * The {@link #onHoverChanged} method is called when the hovered state changes. 8557 * </p> 8558 * 8559 * @param hovered True if the view is hovered. 8560 * 8561 * @see #isHovered 8562 * @see #onHoverChanged 8563 */ 8564 public void setHovered(boolean hovered) { 8565 if (hovered) { 8566 if ((mPrivateFlags & PFLAG_HOVERED) == 0) { 8567 mPrivateFlags |= PFLAG_HOVERED; 8568 refreshDrawableState(); 8569 onHoverChanged(true); 8570 } 8571 } else { 8572 if ((mPrivateFlags & PFLAG_HOVERED) != 0) { 8573 mPrivateFlags &= ~PFLAG_HOVERED; 8574 refreshDrawableState(); 8575 onHoverChanged(false); 8576 } 8577 } 8578 } 8579 8580 /** 8581 * Implement this method to handle hover state changes. 8582 * <p> 8583 * This method is called whenever the hover state changes as a result of a 8584 * call to {@link #setHovered}. 8585 * </p> 8586 * 8587 * @param hovered The current hover state, as returned by {@link #isHovered}. 8588 * 8589 * @see #isHovered 8590 * @see #setHovered 8591 */ 8592 public void onHoverChanged(boolean hovered) { 8593 } 8594 8595 /** 8596 * Implement this method to handle touch screen motion events. 8597 * <p> 8598 * If this method is used to detect click actions, it is recommended that 8599 * the actions be performed by implementing and calling 8600 * {@link #performClick()}. This will ensure consistent system behavior, 8601 * including: 8602 * <ul> 8603 * <li>obeying click sound preferences 8604 * <li>dispatching OnClickListener calls 8605 * <li>handling {@link AccessibilityNodeInfo#ACTION_CLICK ACTION_CLICK} when 8606 * accessibility features are enabled 8607 * </ul> 8608 * 8609 * @param event The motion event. 8610 * @return True if the event was handled, false otherwise. 8611 */ 8612 public boolean onTouchEvent(MotionEvent event) { 8613 final int viewFlags = mViewFlags; 8614 8615 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8616 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) { 8617 setPressed(false); 8618 } 8619 // A disabled view that is clickable still consumes the touch 8620 // events, it just doesn't respond to them. 8621 return (((viewFlags & CLICKABLE) == CLICKABLE || 8622 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 8623 } 8624 8625 if (mTouchDelegate != null) { 8626 if (mTouchDelegate.onTouchEvent(event)) { 8627 return true; 8628 } 8629 } 8630 8631 if (((viewFlags & CLICKABLE) == CLICKABLE || 8632 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 8633 switch (event.getAction()) { 8634 case MotionEvent.ACTION_UP: 8635 boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0; 8636 if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) { 8637 // take focus if we don't have it already and we should in 8638 // touch mode. 8639 boolean focusTaken = false; 8640 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 8641 focusTaken = requestFocus(); 8642 } 8643 8644 if (prepressed) { 8645 // The button is being released before we actually 8646 // showed it as pressed. Make it show the pressed 8647 // state now (before scheduling the click) to ensure 8648 // the user sees it. 8649 setPressed(true); 8650 } 8651 8652 if (!mHasPerformedLongPress) { 8653 // This is a tap, so remove the longpress check 8654 removeLongPressCallback(); 8655 8656 // Only perform take click actions if we were in the pressed state 8657 if (!focusTaken) { 8658 // Use a Runnable and post this rather than calling 8659 // performClick directly. This lets other visual state 8660 // of the view update before click actions start. 8661 if (mPerformClick == null) { 8662 mPerformClick = new PerformClick(); 8663 } 8664 if (!post(mPerformClick)) { 8665 performClick(); 8666 } 8667 } 8668 } 8669 8670 if (mUnsetPressedState == null) { 8671 mUnsetPressedState = new UnsetPressedState(); 8672 } 8673 8674 if (prepressed) { 8675 postDelayed(mUnsetPressedState, 8676 ViewConfiguration.getPressedStateDuration()); 8677 } else if (!post(mUnsetPressedState)) { 8678 // If the post failed, unpress right now 8679 mUnsetPressedState.run(); 8680 } 8681 removeTapCallback(); 8682 } 8683 break; 8684 8685 case MotionEvent.ACTION_DOWN: 8686 mHasPerformedLongPress = false; 8687 8688 if (performButtonActionOnTouchDown(event)) { 8689 break; 8690 } 8691 8692 // Walk up the hierarchy to determine if we're inside a scrolling container. 8693 boolean isInScrollingContainer = isInScrollingContainer(); 8694 8695 // For views inside a scrolling container, delay the pressed feedback for 8696 // a short period in case this is a scroll. 8697 if (isInScrollingContainer) { 8698 mPrivateFlags |= PFLAG_PREPRESSED; 8699 if (mPendingCheckForTap == null) { 8700 mPendingCheckForTap = new CheckForTap(); 8701 } 8702 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 8703 } else { 8704 // Not inside a scrolling container, so show the feedback right away 8705 setPressed(true); 8706 checkForLongClick(0); 8707 } 8708 break; 8709 8710 case MotionEvent.ACTION_CANCEL: 8711 setPressed(false); 8712 removeTapCallback(); 8713 removeLongPressCallback(); 8714 break; 8715 8716 case MotionEvent.ACTION_MOVE: 8717 final int x = (int) event.getX(); 8718 final int y = (int) event.getY(); 8719 8720 // Be lenient about moving outside of buttons 8721 if (!pointInView(x, y, mTouchSlop)) { 8722 // Outside button 8723 removeTapCallback(); 8724 if ((mPrivateFlags & PFLAG_PRESSED) != 0) { 8725 // Remove any future long press/tap checks 8726 removeLongPressCallback(); 8727 8728 setPressed(false); 8729 } 8730 } 8731 break; 8732 } 8733 return true; 8734 } 8735 8736 return false; 8737 } 8738 8739 /** 8740 * @hide 8741 */ 8742 public boolean isInScrollingContainer() { 8743 ViewParent p = getParent(); 8744 while (p != null && p instanceof ViewGroup) { 8745 if (((ViewGroup) p).shouldDelayChildPressedState()) { 8746 return true; 8747 } 8748 p = p.getParent(); 8749 } 8750 return false; 8751 } 8752 8753 /** 8754 * Remove the longpress detection timer. 8755 */ 8756 private void removeLongPressCallback() { 8757 if (mPendingCheckForLongPress != null) { 8758 removeCallbacks(mPendingCheckForLongPress); 8759 } 8760 } 8761 8762 /** 8763 * Remove the pending click action 8764 */ 8765 private void removePerformClickCallback() { 8766 if (mPerformClick != null) { 8767 removeCallbacks(mPerformClick); 8768 } 8769 } 8770 8771 /** 8772 * Remove the prepress detection timer. 8773 */ 8774 private void removeUnsetPressCallback() { 8775 if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) { 8776 setPressed(false); 8777 removeCallbacks(mUnsetPressedState); 8778 } 8779 } 8780 8781 /** 8782 * Remove the tap detection timer. 8783 */ 8784 private void removeTapCallback() { 8785 if (mPendingCheckForTap != null) { 8786 mPrivateFlags &= ~PFLAG_PREPRESSED; 8787 removeCallbacks(mPendingCheckForTap); 8788 } 8789 } 8790 8791 /** 8792 * Cancels a pending long press. Your subclass can use this if you 8793 * want the context menu to come up if the user presses and holds 8794 * at the same place, but you don't want it to come up if they press 8795 * and then move around enough to cause scrolling. 8796 */ 8797 public void cancelLongPress() { 8798 removeLongPressCallback(); 8799 8800 /* 8801 * The prepressed state handled by the tap callback is a display 8802 * construct, but the tap callback will post a long press callback 8803 * less its own timeout. Remove it here. 8804 */ 8805 removeTapCallback(); 8806 } 8807 8808 /** 8809 * Remove the pending callback for sending a 8810 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8811 */ 8812 private void removeSendViewScrolledAccessibilityEventCallback() { 8813 if (mSendViewScrolledAccessibilityEvent != null) { 8814 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8815 mSendViewScrolledAccessibilityEvent.mIsPending = false; 8816 } 8817 } 8818 8819 /** 8820 * Sets the TouchDelegate for this View. 8821 */ 8822 public void setTouchDelegate(TouchDelegate delegate) { 8823 mTouchDelegate = delegate; 8824 } 8825 8826 /** 8827 * Gets the TouchDelegate for this View. 8828 */ 8829 public TouchDelegate getTouchDelegate() { 8830 return mTouchDelegate; 8831 } 8832 8833 /** 8834 * Set flags controlling behavior of this view. 8835 * 8836 * @param flags Constant indicating the value which should be set 8837 * @param mask Constant indicating the bit range that should be changed 8838 */ 8839 void setFlags(int flags, int mask) { 8840 final boolean accessibilityEnabled = 8841 AccessibilityManager.getInstance(mContext).isEnabled(); 8842 final boolean oldIncludeForAccessibility = accessibilityEnabled && includeForAccessibility(); 8843 8844 int old = mViewFlags; 8845 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8846 8847 int changed = mViewFlags ^ old; 8848 if (changed == 0) { 8849 return; 8850 } 8851 int privateFlags = mPrivateFlags; 8852 8853 /* Check if the FOCUSABLE bit has changed */ 8854 if (((changed & FOCUSABLE_MASK) != 0) && 8855 ((privateFlags & PFLAG_HAS_BOUNDS) !=0)) { 8856 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8857 && ((privateFlags & PFLAG_FOCUSED) != 0)) { 8858 /* Give up focus if we are no longer focusable */ 8859 clearFocus(); 8860 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8861 && ((privateFlags & PFLAG_FOCUSED) == 0)) { 8862 /* 8863 * Tell the view system that we are now available to take focus 8864 * if no one else already has it. 8865 */ 8866 if (mParent != null) mParent.focusableViewAvailable(this); 8867 } 8868 } 8869 8870 final int newVisibility = flags & VISIBILITY_MASK; 8871 if (newVisibility == VISIBLE) { 8872 if ((changed & VISIBILITY_MASK) != 0) { 8873 /* 8874 * If this view is becoming visible, invalidate it in case it changed while 8875 * it was not visible. Marking it drawn ensures that the invalidation will 8876 * go through. 8877 */ 8878 mPrivateFlags |= PFLAG_DRAWN; 8879 invalidate(true); 8880 8881 needGlobalAttributesUpdate(true); 8882 8883 // a view becoming visible is worth notifying the parent 8884 // about in case nothing has focus. even if this specific view 8885 // isn't focusable, it may contain something that is, so let 8886 // the root view try to give this focus if nothing else does. 8887 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8888 mParent.focusableViewAvailable(this); 8889 } 8890 } 8891 } 8892 8893 /* Check if the GONE bit has changed */ 8894 if ((changed & GONE) != 0) { 8895 needGlobalAttributesUpdate(false); 8896 requestLayout(); 8897 8898 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8899 if (hasFocus()) clearFocus(); 8900 clearAccessibilityFocus(); 8901 destroyDrawingCache(); 8902 if (mParent instanceof View) { 8903 // GONE views noop invalidation, so invalidate the parent 8904 ((View) mParent).invalidate(true); 8905 } 8906 // Mark the view drawn to ensure that it gets invalidated properly the next 8907 // time it is visible and gets invalidated 8908 mPrivateFlags |= PFLAG_DRAWN; 8909 } 8910 if (mAttachInfo != null) { 8911 mAttachInfo.mViewVisibilityChanged = true; 8912 } 8913 } 8914 8915 /* Check if the VISIBLE bit has changed */ 8916 if ((changed & INVISIBLE) != 0) { 8917 needGlobalAttributesUpdate(false); 8918 /* 8919 * If this view is becoming invisible, set the DRAWN flag so that 8920 * the next invalidate() will not be skipped. 8921 */ 8922 mPrivateFlags |= PFLAG_DRAWN; 8923 8924 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE)) { 8925 // root view becoming invisible shouldn't clear focus and accessibility focus 8926 if (getRootView() != this) { 8927 if (hasFocus()) clearFocus(); 8928 clearAccessibilityFocus(); 8929 } 8930 } 8931 if (mAttachInfo != null) { 8932 mAttachInfo.mViewVisibilityChanged = true; 8933 } 8934 } 8935 8936 if ((changed & VISIBILITY_MASK) != 0) { 8937 // If the view is invisible, cleanup its display list to free up resources 8938 if (newVisibility != VISIBLE) { 8939 cleanupDraw(); 8940 } 8941 8942 if (mParent instanceof ViewGroup) { 8943 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8944 (changed & VISIBILITY_MASK), newVisibility); 8945 ((View) mParent).invalidate(true); 8946 } else if (mParent != null) { 8947 mParent.invalidateChild(this, null); 8948 } 8949 dispatchVisibilityChanged(this, newVisibility); 8950 } 8951 8952 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8953 destroyDrawingCache(); 8954 } 8955 8956 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8957 destroyDrawingCache(); 8958 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8959 invalidateParentCaches(); 8960 } 8961 8962 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8963 destroyDrawingCache(); 8964 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8965 } 8966 8967 if ((changed & DRAW_MASK) != 0) { 8968 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8969 if (mBackground != null) { 8970 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8971 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 8972 } else { 8973 mPrivateFlags |= PFLAG_SKIP_DRAW; 8974 } 8975 } else { 8976 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8977 } 8978 requestLayout(); 8979 invalidate(true); 8980 } 8981 8982 if ((changed & KEEP_SCREEN_ON) != 0) { 8983 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8984 mParent.recomputeViewAttributes(this); 8985 } 8986 } 8987 8988 if (accessibilityEnabled) { 8989 if ((changed & FOCUSABLE_MASK) != 0 || (changed & VISIBILITY_MASK) != 0 8990 || (changed & CLICKABLE) != 0 || (changed & LONG_CLICKABLE) != 0) { 8991 if (oldIncludeForAccessibility != includeForAccessibility()) { 8992 notifySubtreeAccessibilityStateChangedIfNeeded(); 8993 } else { 8994 notifyViewAccessibilityStateChangedIfNeeded( 8995 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 8996 } 8997 } else if ((changed & ENABLED_MASK) != 0) { 8998 notifyViewAccessibilityStateChangedIfNeeded( 8999 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 9000 } 9001 } 9002 } 9003 9004 /** 9005 * Change the view's z order in the tree, so it's on top of other sibling 9006 * views. This ordering change may affect layout, if the parent container 9007 * uses an order-dependent layout scheme (e.g., LinearLayout). Prior 9008 * to {@link android.os.Build.VERSION_CODES#KITKAT} this 9009 * method should be followed by calls to {@link #requestLayout()} and 9010 * {@link View#invalidate()} on the view's parent to force the parent to redraw 9011 * with the new child ordering. 9012 * 9013 * @see ViewGroup#bringChildToFront(View) 9014 */ 9015 public void bringToFront() { 9016 if (mParent != null) { 9017 mParent.bringChildToFront(this); 9018 } 9019 } 9020 9021 /** 9022 * This is called in response to an internal scroll in this view (i.e., the 9023 * view scrolled its own contents). This is typically as a result of 9024 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 9025 * called. 9026 * 9027 * @param l Current horizontal scroll origin. 9028 * @param t Current vertical scroll origin. 9029 * @param oldl Previous horizontal scroll origin. 9030 * @param oldt Previous vertical scroll origin. 9031 */ 9032 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 9033 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 9034 postSendViewScrolledAccessibilityEventCallback(); 9035 } 9036 9037 mBackgroundSizeChanged = true; 9038 9039 final AttachInfo ai = mAttachInfo; 9040 if (ai != null) { 9041 ai.mViewScrollChanged = true; 9042 } 9043 } 9044 9045 /** 9046 * Interface definition for a callback to be invoked when the layout bounds of a view 9047 * changes due to layout processing. 9048 */ 9049 public interface OnLayoutChangeListener { 9050 /** 9051 * Called when the layout bounds of a view changes due to layout processing. 9052 * 9053 * @param v The view whose bounds have changed. 9054 * @param left The new value of the view's left property. 9055 * @param top The new value of the view's top property. 9056 * @param right The new value of the view's right property. 9057 * @param bottom The new value of the view's bottom property. 9058 * @param oldLeft The previous value of the view's left property. 9059 * @param oldTop The previous value of the view's top property. 9060 * @param oldRight The previous value of the view's right property. 9061 * @param oldBottom The previous value of the view's bottom property. 9062 */ 9063 void onLayoutChange(View v, int left, int top, int right, int bottom, 9064 int oldLeft, int oldTop, int oldRight, int oldBottom); 9065 } 9066 9067 /** 9068 * This is called during layout when the size of this view has changed. If 9069 * you were just added to the view hierarchy, you're called with the old 9070 * values of 0. 9071 * 9072 * @param w Current width of this view. 9073 * @param h Current height of this view. 9074 * @param oldw Old width of this view. 9075 * @param oldh Old height of this view. 9076 */ 9077 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 9078 } 9079 9080 /** 9081 * Called by draw to draw the child views. This may be overridden 9082 * by derived classes to gain control just before its children are drawn 9083 * (but after its own view has been drawn). 9084 * @param canvas the canvas on which to draw the view 9085 */ 9086 protected void dispatchDraw(Canvas canvas) { 9087 9088 } 9089 9090 /** 9091 * Gets the parent of this view. Note that the parent is a 9092 * ViewParent and not necessarily a View. 9093 * 9094 * @return Parent of this view. 9095 */ 9096 public final ViewParent getParent() { 9097 return mParent; 9098 } 9099 9100 /** 9101 * Set the horizontal scrolled position of your view. This will cause a call to 9102 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9103 * invalidated. 9104 * @param value the x position to scroll to 9105 */ 9106 public void setScrollX(int value) { 9107 scrollTo(value, mScrollY); 9108 } 9109 9110 /** 9111 * Set the vertical scrolled position of your view. This will cause a call to 9112 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9113 * invalidated. 9114 * @param value the y position to scroll to 9115 */ 9116 public void setScrollY(int value) { 9117 scrollTo(mScrollX, value); 9118 } 9119 9120 /** 9121 * Return the scrolled left position of this view. This is the left edge of 9122 * the displayed part of your view. You do not need to draw any pixels 9123 * farther left, since those are outside of the frame of your view on 9124 * screen. 9125 * 9126 * @return The left edge of the displayed part of your view, in pixels. 9127 */ 9128 public final int getScrollX() { 9129 return mScrollX; 9130 } 9131 9132 /** 9133 * Return the scrolled top position of this view. This is the top edge of 9134 * the displayed part of your view. You do not need to draw any pixels above 9135 * it, since those are outside of the frame of your view on screen. 9136 * 9137 * @return The top edge of the displayed part of your view, in pixels. 9138 */ 9139 public final int getScrollY() { 9140 return mScrollY; 9141 } 9142 9143 /** 9144 * Return the width of the your view. 9145 * 9146 * @return The width of your view, in pixels. 9147 */ 9148 @ViewDebug.ExportedProperty(category = "layout") 9149 public final int getWidth() { 9150 return mRight - mLeft; 9151 } 9152 9153 /** 9154 * Return the height of your view. 9155 * 9156 * @return The height of your view, in pixels. 9157 */ 9158 @ViewDebug.ExportedProperty(category = "layout") 9159 public final int getHeight() { 9160 return mBottom - mTop; 9161 } 9162 9163 /** 9164 * Return the visible drawing bounds of your view. Fills in the output 9165 * rectangle with the values from getScrollX(), getScrollY(), 9166 * getWidth(), and getHeight(). These bounds do not account for any 9167 * transformation properties currently set on the view, such as 9168 * {@link #setScaleX(float)} or {@link #setRotation(float)}. 9169 * 9170 * @param outRect The (scrolled) drawing bounds of the view. 9171 */ 9172 public void getDrawingRect(Rect outRect) { 9173 outRect.left = mScrollX; 9174 outRect.top = mScrollY; 9175 outRect.right = mScrollX + (mRight - mLeft); 9176 outRect.bottom = mScrollY + (mBottom - mTop); 9177 } 9178 9179 /** 9180 * Like {@link #getMeasuredWidthAndState()}, but only returns the 9181 * raw width component (that is the result is masked by 9182 * {@link #MEASURED_SIZE_MASK}). 9183 * 9184 * @return The raw measured width of this view. 9185 */ 9186 public final int getMeasuredWidth() { 9187 return mMeasuredWidth & MEASURED_SIZE_MASK; 9188 } 9189 9190 /** 9191 * Return the full width measurement information for this view as computed 9192 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 9193 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 9194 * This should be used during measurement and layout calculations only. Use 9195 * {@link #getWidth()} to see how wide a view is after layout. 9196 * 9197 * @return The measured width of this view as a bit mask. 9198 */ 9199 public final int getMeasuredWidthAndState() { 9200 return mMeasuredWidth; 9201 } 9202 9203 /** 9204 * Like {@link #getMeasuredHeightAndState()}, but only returns the 9205 * raw width component (that is the result is masked by 9206 * {@link #MEASURED_SIZE_MASK}). 9207 * 9208 * @return The raw measured height of this view. 9209 */ 9210 public final int getMeasuredHeight() { 9211 return mMeasuredHeight & MEASURED_SIZE_MASK; 9212 } 9213 9214 /** 9215 * Return the full height measurement information for this view as computed 9216 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 9217 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 9218 * This should be used during measurement and layout calculations only. Use 9219 * {@link #getHeight()} to see how wide a view is after layout. 9220 * 9221 * @return The measured width of this view as a bit mask. 9222 */ 9223 public final int getMeasuredHeightAndState() { 9224 return mMeasuredHeight; 9225 } 9226 9227 /** 9228 * Return only the state bits of {@link #getMeasuredWidthAndState()} 9229 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 9230 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 9231 * and the height component is at the shifted bits 9232 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 9233 */ 9234 public final int getMeasuredState() { 9235 return (mMeasuredWidth&MEASURED_STATE_MASK) 9236 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 9237 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 9238 } 9239 9240 /** 9241 * The transform matrix of this view, which is calculated based on the current 9242 * roation, scale, and pivot properties. 9243 * 9244 * @see #getRotation() 9245 * @see #getScaleX() 9246 * @see #getScaleY() 9247 * @see #getPivotX() 9248 * @see #getPivotY() 9249 * @return The current transform matrix for the view 9250 */ 9251 public Matrix getMatrix() { 9252 if (mTransformationInfo != null) { 9253 updateMatrix(); 9254 return mTransformationInfo.mMatrix; 9255 } 9256 return Matrix.IDENTITY_MATRIX; 9257 } 9258 9259 /** 9260 * Utility function to determine if the value is far enough away from zero to be 9261 * considered non-zero. 9262 * @param value A floating point value to check for zero-ness 9263 * @return whether the passed-in value is far enough away from zero to be considered non-zero 9264 */ 9265 private static boolean nonzero(float value) { 9266 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 9267 } 9268 9269 /** 9270 * Returns true if the transform matrix is the identity matrix. 9271 * Recomputes the matrix if necessary. 9272 * 9273 * @return True if the transform matrix is the identity matrix, false otherwise. 9274 */ 9275 final boolean hasIdentityMatrix() { 9276 if (mTransformationInfo != null) { 9277 updateMatrix(); 9278 return mTransformationInfo.mMatrixIsIdentity; 9279 } 9280 return true; 9281 } 9282 9283 void ensureTransformationInfo() { 9284 if (mTransformationInfo == null) { 9285 mTransformationInfo = new TransformationInfo(); 9286 } 9287 } 9288 9289 /** 9290 * Recomputes the transform matrix if necessary. 9291 */ 9292 private void updateMatrix() { 9293 final TransformationInfo info = mTransformationInfo; 9294 if (info == null) { 9295 return; 9296 } 9297 if (info.mMatrixDirty) { 9298 // transform-related properties have changed since the last time someone 9299 // asked for the matrix; recalculate it with the current values 9300 9301 // Figure out if we need to update the pivot point 9302 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9303 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 9304 info.mPrevWidth = mRight - mLeft; 9305 info.mPrevHeight = mBottom - mTop; 9306 info.mPivotX = info.mPrevWidth / 2f; 9307 info.mPivotY = info.mPrevHeight / 2f; 9308 } 9309 } 9310 info.mMatrix.reset(); 9311 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 9312 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 9313 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 9314 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 9315 } else { 9316 if (info.mCamera == null) { 9317 info.mCamera = new Camera(); 9318 info.matrix3D = new Matrix(); 9319 } 9320 info.mCamera.save(); 9321 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 9322 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 9323 info.mCamera.getMatrix(info.matrix3D); 9324 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 9325 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 9326 info.mPivotY + info.mTranslationY); 9327 info.mMatrix.postConcat(info.matrix3D); 9328 info.mCamera.restore(); 9329 } 9330 info.mMatrixDirty = false; 9331 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 9332 info.mInverseMatrixDirty = true; 9333 } 9334 } 9335 9336 /** 9337 * Utility method to retrieve the inverse of the current mMatrix property. 9338 * We cache the matrix to avoid recalculating it when transform properties 9339 * have not changed. 9340 * 9341 * @return The inverse of the current matrix of this view. 9342 */ 9343 final Matrix getInverseMatrix() { 9344 final TransformationInfo info = mTransformationInfo; 9345 if (info != null) { 9346 updateMatrix(); 9347 if (info.mInverseMatrixDirty) { 9348 if (info.mInverseMatrix == null) { 9349 info.mInverseMatrix = new Matrix(); 9350 } 9351 info.mMatrix.invert(info.mInverseMatrix); 9352 info.mInverseMatrixDirty = false; 9353 } 9354 return info.mInverseMatrix; 9355 } 9356 return Matrix.IDENTITY_MATRIX; 9357 } 9358 9359 /** 9360 * Gets the distance along the Z axis from the camera to this view. 9361 * 9362 * @see #setCameraDistance(float) 9363 * 9364 * @return The distance along the Z axis. 9365 */ 9366 public float getCameraDistance() { 9367 ensureTransformationInfo(); 9368 final float dpi = mResources.getDisplayMetrics().densityDpi; 9369 final TransformationInfo info = mTransformationInfo; 9370 if (info.mCamera == null) { 9371 info.mCamera = new Camera(); 9372 info.matrix3D = new Matrix(); 9373 } 9374 return -(info.mCamera.getLocationZ() * dpi); 9375 } 9376 9377 /** 9378 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 9379 * views are drawn) from the camera to this view. The camera's distance 9380 * affects 3D transformations, for instance rotations around the X and Y 9381 * axis. If the rotationX or rotationY properties are changed and this view is 9382 * large (more than half the size of the screen), it is recommended to always 9383 * use a camera distance that's greater than the height (X axis rotation) or 9384 * the width (Y axis rotation) of this view.</p> 9385 * 9386 * <p>The distance of the camera from the view plane can have an affect on the 9387 * perspective distortion of the view when it is rotated around the x or y axis. 9388 * For example, a large distance will result in a large viewing angle, and there 9389 * will not be much perspective distortion of the view as it rotates. A short 9390 * distance may cause much more perspective distortion upon rotation, and can 9391 * also result in some drawing artifacts if the rotated view ends up partially 9392 * behind the camera (which is why the recommendation is to use a distance at 9393 * least as far as the size of the view, if the view is to be rotated.)</p> 9394 * 9395 * <p>The distance is expressed in "depth pixels." The default distance depends 9396 * on the screen density. For instance, on a medium density display, the 9397 * default distance is 1280. On a high density display, the default distance 9398 * is 1920.</p> 9399 * 9400 * <p>If you want to specify a distance that leads to visually consistent 9401 * results across various densities, use the following formula:</p> 9402 * <pre> 9403 * float scale = context.getResources().getDisplayMetrics().density; 9404 * view.setCameraDistance(distance * scale); 9405 * </pre> 9406 * 9407 * <p>The density scale factor of a high density display is 1.5, 9408 * and 1920 = 1280 * 1.5.</p> 9409 * 9410 * @param distance The distance in "depth pixels", if negative the opposite 9411 * value is used 9412 * 9413 * @see #setRotationX(float) 9414 * @see #setRotationY(float) 9415 */ 9416 public void setCameraDistance(float distance) { 9417 invalidateViewProperty(true, false); 9418 9419 ensureTransformationInfo(); 9420 final float dpi = mResources.getDisplayMetrics().densityDpi; 9421 final TransformationInfo info = mTransformationInfo; 9422 if (info.mCamera == null) { 9423 info.mCamera = new Camera(); 9424 info.matrix3D = new Matrix(); 9425 } 9426 9427 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 9428 info.mMatrixDirty = true; 9429 9430 invalidateViewProperty(false, false); 9431 if (mDisplayList != null) { 9432 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 9433 } 9434 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9435 // View was rejected last time it was drawn by its parent; this may have changed 9436 invalidateParentIfNeeded(); 9437 } 9438 } 9439 9440 /** 9441 * The degrees that the view is rotated around the pivot point. 9442 * 9443 * @see #setRotation(float) 9444 * @see #getPivotX() 9445 * @see #getPivotY() 9446 * 9447 * @return The degrees of rotation. 9448 */ 9449 @ViewDebug.ExportedProperty(category = "drawing") 9450 public float getRotation() { 9451 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 9452 } 9453 9454 /** 9455 * Sets the degrees that the view is rotated around the pivot point. Increasing values 9456 * result in clockwise rotation. 9457 * 9458 * @param rotation The degrees of rotation. 9459 * 9460 * @see #getRotation() 9461 * @see #getPivotX() 9462 * @see #getPivotY() 9463 * @see #setRotationX(float) 9464 * @see #setRotationY(float) 9465 * 9466 * @attr ref android.R.styleable#View_rotation 9467 */ 9468 public void setRotation(float rotation) { 9469 ensureTransformationInfo(); 9470 final TransformationInfo info = mTransformationInfo; 9471 if (info.mRotation != rotation) { 9472 // Double-invalidation is necessary to capture view's old and new areas 9473 invalidateViewProperty(true, false); 9474 info.mRotation = rotation; 9475 info.mMatrixDirty = true; 9476 invalidateViewProperty(false, true); 9477 if (mDisplayList != null) { 9478 mDisplayList.setRotation(rotation); 9479 } 9480 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9481 // View was rejected last time it was drawn by its parent; this may have changed 9482 invalidateParentIfNeeded(); 9483 } 9484 } 9485 } 9486 9487 /** 9488 * The degrees that the view is rotated around the vertical axis through the pivot point. 9489 * 9490 * @see #getPivotX() 9491 * @see #getPivotY() 9492 * @see #setRotationY(float) 9493 * 9494 * @return The degrees of Y rotation. 9495 */ 9496 @ViewDebug.ExportedProperty(category = "drawing") 9497 public float getRotationY() { 9498 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 9499 } 9500 9501 /** 9502 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 9503 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 9504 * down the y axis. 9505 * 9506 * When rotating large views, it is recommended to adjust the camera distance 9507 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9508 * 9509 * @param rotationY The degrees of Y rotation. 9510 * 9511 * @see #getRotationY() 9512 * @see #getPivotX() 9513 * @see #getPivotY() 9514 * @see #setRotation(float) 9515 * @see #setRotationX(float) 9516 * @see #setCameraDistance(float) 9517 * 9518 * @attr ref android.R.styleable#View_rotationY 9519 */ 9520 public void setRotationY(float rotationY) { 9521 ensureTransformationInfo(); 9522 final TransformationInfo info = mTransformationInfo; 9523 if (info.mRotationY != rotationY) { 9524 invalidateViewProperty(true, false); 9525 info.mRotationY = rotationY; 9526 info.mMatrixDirty = true; 9527 invalidateViewProperty(false, true); 9528 if (mDisplayList != null) { 9529 mDisplayList.setRotationY(rotationY); 9530 } 9531 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9532 // View was rejected last time it was drawn by its parent; this may have changed 9533 invalidateParentIfNeeded(); 9534 } 9535 } 9536 } 9537 9538 /** 9539 * The degrees that the view is rotated around the horizontal axis through the pivot point. 9540 * 9541 * @see #getPivotX() 9542 * @see #getPivotY() 9543 * @see #setRotationX(float) 9544 * 9545 * @return The degrees of X rotation. 9546 */ 9547 @ViewDebug.ExportedProperty(category = "drawing") 9548 public float getRotationX() { 9549 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 9550 } 9551 9552 /** 9553 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 9554 * Increasing values result in clockwise rotation from the viewpoint of looking down the 9555 * x axis. 9556 * 9557 * When rotating large views, it is recommended to adjust the camera distance 9558 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9559 * 9560 * @param rotationX The degrees of X rotation. 9561 * 9562 * @see #getRotationX() 9563 * @see #getPivotX() 9564 * @see #getPivotY() 9565 * @see #setRotation(float) 9566 * @see #setRotationY(float) 9567 * @see #setCameraDistance(float) 9568 * 9569 * @attr ref android.R.styleable#View_rotationX 9570 */ 9571 public void setRotationX(float rotationX) { 9572 ensureTransformationInfo(); 9573 final TransformationInfo info = mTransformationInfo; 9574 if (info.mRotationX != rotationX) { 9575 invalidateViewProperty(true, false); 9576 info.mRotationX = rotationX; 9577 info.mMatrixDirty = true; 9578 invalidateViewProperty(false, true); 9579 if (mDisplayList != null) { 9580 mDisplayList.setRotationX(rotationX); 9581 } 9582 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9583 // View was rejected last time it was drawn by its parent; this may have changed 9584 invalidateParentIfNeeded(); 9585 } 9586 } 9587 } 9588 9589 /** 9590 * The amount that the view is scaled in x around the pivot point, as a proportion of 9591 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 9592 * 9593 * <p>By default, this is 1.0f. 9594 * 9595 * @see #getPivotX() 9596 * @see #getPivotY() 9597 * @return The scaling factor. 9598 */ 9599 @ViewDebug.ExportedProperty(category = "drawing") 9600 public float getScaleX() { 9601 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 9602 } 9603 9604 /** 9605 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 9606 * the view's unscaled width. A value of 1 means that no scaling is applied. 9607 * 9608 * @param scaleX The scaling factor. 9609 * @see #getPivotX() 9610 * @see #getPivotY() 9611 * 9612 * @attr ref android.R.styleable#View_scaleX 9613 */ 9614 public void setScaleX(float scaleX) { 9615 ensureTransformationInfo(); 9616 final TransformationInfo info = mTransformationInfo; 9617 if (info.mScaleX != scaleX) { 9618 invalidateViewProperty(true, false); 9619 info.mScaleX = scaleX; 9620 info.mMatrixDirty = true; 9621 invalidateViewProperty(false, true); 9622 if (mDisplayList != null) { 9623 mDisplayList.setScaleX(scaleX); 9624 } 9625 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9626 // View was rejected last time it was drawn by its parent; this may have changed 9627 invalidateParentIfNeeded(); 9628 } 9629 } 9630 } 9631 9632 /** 9633 * The amount that the view is scaled in y around the pivot point, as a proportion of 9634 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 9635 * 9636 * <p>By default, this is 1.0f. 9637 * 9638 * @see #getPivotX() 9639 * @see #getPivotY() 9640 * @return The scaling factor. 9641 */ 9642 @ViewDebug.ExportedProperty(category = "drawing") 9643 public float getScaleY() { 9644 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 9645 } 9646 9647 /** 9648 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 9649 * the view's unscaled width. A value of 1 means that no scaling is applied. 9650 * 9651 * @param scaleY The scaling factor. 9652 * @see #getPivotX() 9653 * @see #getPivotY() 9654 * 9655 * @attr ref android.R.styleable#View_scaleY 9656 */ 9657 public void setScaleY(float scaleY) { 9658 ensureTransformationInfo(); 9659 final TransformationInfo info = mTransformationInfo; 9660 if (info.mScaleY != scaleY) { 9661 invalidateViewProperty(true, false); 9662 info.mScaleY = scaleY; 9663 info.mMatrixDirty = true; 9664 invalidateViewProperty(false, true); 9665 if (mDisplayList != null) { 9666 mDisplayList.setScaleY(scaleY); 9667 } 9668 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9669 // View was rejected last time it was drawn by its parent; this may have changed 9670 invalidateParentIfNeeded(); 9671 } 9672 } 9673 } 9674 9675 /** 9676 * The x location of the point around which the view is {@link #setRotation(float) rotated} 9677 * and {@link #setScaleX(float) scaled}. 9678 * 9679 * @see #getRotation() 9680 * @see #getScaleX() 9681 * @see #getScaleY() 9682 * @see #getPivotY() 9683 * @return The x location of the pivot point. 9684 * 9685 * @attr ref android.R.styleable#View_transformPivotX 9686 */ 9687 @ViewDebug.ExportedProperty(category = "drawing") 9688 public float getPivotX() { 9689 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 9690 } 9691 9692 /** 9693 * Sets the x location of the point around which the view is 9694 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 9695 * By default, the pivot point is centered on the object. 9696 * Setting this property disables this behavior and causes the view to use only the 9697 * explicitly set pivotX and pivotY values. 9698 * 9699 * @param pivotX The x location of the pivot point. 9700 * @see #getRotation() 9701 * @see #getScaleX() 9702 * @see #getScaleY() 9703 * @see #getPivotY() 9704 * 9705 * @attr ref android.R.styleable#View_transformPivotX 9706 */ 9707 public void setPivotX(float pivotX) { 9708 ensureTransformationInfo(); 9709 final TransformationInfo info = mTransformationInfo; 9710 boolean pivotSet = (mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 9711 PFLAG_PIVOT_EXPLICITLY_SET; 9712 if (info.mPivotX != pivotX || !pivotSet) { 9713 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9714 invalidateViewProperty(true, false); 9715 info.mPivotX = pivotX; 9716 info.mMatrixDirty = true; 9717 invalidateViewProperty(false, true); 9718 if (mDisplayList != null) { 9719 mDisplayList.setPivotX(pivotX); 9720 } 9721 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9722 // View was rejected last time it was drawn by its parent; this may have changed 9723 invalidateParentIfNeeded(); 9724 } 9725 } 9726 } 9727 9728 /** 9729 * The y location of the point around which the view is {@link #setRotation(float) rotated} 9730 * and {@link #setScaleY(float) scaled}. 9731 * 9732 * @see #getRotation() 9733 * @see #getScaleX() 9734 * @see #getScaleY() 9735 * @see #getPivotY() 9736 * @return The y location of the pivot point. 9737 * 9738 * @attr ref android.R.styleable#View_transformPivotY 9739 */ 9740 @ViewDebug.ExportedProperty(category = "drawing") 9741 public float getPivotY() { 9742 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 9743 } 9744 9745 /** 9746 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 9747 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 9748 * Setting this property disables this behavior and causes the view to use only the 9749 * explicitly set pivotX and pivotY values. 9750 * 9751 * @param pivotY The y location of the pivot point. 9752 * @see #getRotation() 9753 * @see #getScaleX() 9754 * @see #getScaleY() 9755 * @see #getPivotY() 9756 * 9757 * @attr ref android.R.styleable#View_transformPivotY 9758 */ 9759 public void setPivotY(float pivotY) { 9760 ensureTransformationInfo(); 9761 final TransformationInfo info = mTransformationInfo; 9762 boolean pivotSet = (mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 9763 PFLAG_PIVOT_EXPLICITLY_SET; 9764 if (info.mPivotY != pivotY || !pivotSet) { 9765 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9766 invalidateViewProperty(true, false); 9767 info.mPivotY = pivotY; 9768 info.mMatrixDirty = true; 9769 invalidateViewProperty(false, true); 9770 if (mDisplayList != null) { 9771 mDisplayList.setPivotY(pivotY); 9772 } 9773 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9774 // View was rejected last time it was drawn by its parent; this may have changed 9775 invalidateParentIfNeeded(); 9776 } 9777 } 9778 } 9779 9780 /** 9781 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 9782 * completely transparent and 1 means the view is completely opaque. 9783 * 9784 * <p>By default this is 1.0f. 9785 * @return The opacity of the view. 9786 */ 9787 @ViewDebug.ExportedProperty(category = "drawing") 9788 public float getAlpha() { 9789 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 9790 } 9791 9792 /** 9793 * Returns whether this View has content which overlaps. 9794 * 9795 * <p>This function, intended to be overridden by specific View types, is an optimization when 9796 * alpha is set on a view. If rendering overlaps in a view with alpha < 1, that view is drawn to 9797 * an offscreen buffer and then composited into place, which can be expensive. If the view has 9798 * no overlapping rendering, the view can draw each primitive with the appropriate alpha value 9799 * directly. An example of overlapping rendering is a TextView with a background image, such as 9800 * a Button. An example of non-overlapping rendering is a TextView with no background, or an 9801 * ImageView with only the foreground image. The default implementation returns true; subclasses 9802 * should override if they have cases which can be optimized.</p> 9803 * 9804 * <p>The current implementation of the saveLayer and saveLayerAlpha methods in {@link Canvas} 9805 * necessitates that a View return true if it uses the methods internally without passing the 9806 * {@link Canvas#CLIP_TO_LAYER_SAVE_FLAG}.</p> 9807 * 9808 * @return true if the content in this view might overlap, false otherwise. 9809 */ 9810 public boolean hasOverlappingRendering() { 9811 return true; 9812 } 9813 9814 /** 9815 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 9816 * completely transparent and 1 means the view is completely opaque.</p> 9817 * 9818 * <p> Note that setting alpha to a translucent value (0 < alpha < 1) can have significant 9819 * performance implications, especially for large views. It is best to use the alpha property 9820 * sparingly and transiently, as in the case of fading animations.</p> 9821 * 9822 * <p>For a view with a frequently changing alpha, such as during a fading animation, it is 9823 * strongly recommended for performance reasons to either override 9824 * {@link #hasOverlappingRendering()} to return false if appropriate, or setting a 9825 * {@link #setLayerType(int, android.graphics.Paint) layer type} on the view.</p> 9826 * 9827 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 9828 * responsible for applying the opacity itself.</p> 9829 * 9830 * <p>Note that if the view is backed by a 9831 * {@link #setLayerType(int, android.graphics.Paint) layer} and is associated with a 9832 * {@link #setLayerPaint(android.graphics.Paint) layer paint}, setting an alpha value less than 9833 * 1.0 will supercede the alpha of the layer paint.</p> 9834 * 9835 * @param alpha The opacity of the view. 9836 * 9837 * @see #hasOverlappingRendering() 9838 * @see #setLayerType(int, android.graphics.Paint) 9839 * 9840 * @attr ref android.R.styleable#View_alpha 9841 */ 9842 public void setAlpha(float alpha) { 9843 ensureTransformationInfo(); 9844 if (mTransformationInfo.mAlpha != alpha) { 9845 mTransformationInfo.mAlpha = alpha; 9846 if (onSetAlpha((int) (alpha * 255))) { 9847 mPrivateFlags |= PFLAG_ALPHA_SET; 9848 // subclass is handling alpha - don't optimize rendering cache invalidation 9849 invalidateParentCaches(); 9850 invalidate(true); 9851 } else { 9852 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9853 invalidateViewProperty(true, false); 9854 if (mDisplayList != null) { 9855 mDisplayList.setAlpha(getFinalAlpha()); 9856 } 9857 } 9858 } 9859 } 9860 9861 /** 9862 * Faster version of setAlpha() which performs the same steps except there are 9863 * no calls to invalidate(). The caller of this function should perform proper invalidation 9864 * on the parent and this object. The return value indicates whether the subclass handles 9865 * alpha (the return value for onSetAlpha()). 9866 * 9867 * @param alpha The new value for the alpha property 9868 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9869 * the new value for the alpha property is different from the old value 9870 */ 9871 boolean setAlphaNoInvalidation(float alpha) { 9872 ensureTransformationInfo(); 9873 if (mTransformationInfo.mAlpha != alpha) { 9874 mTransformationInfo.mAlpha = alpha; 9875 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9876 if (subclassHandlesAlpha) { 9877 mPrivateFlags |= PFLAG_ALPHA_SET; 9878 return true; 9879 } else { 9880 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9881 if (mDisplayList != null) { 9882 mDisplayList.setAlpha(getFinalAlpha()); 9883 } 9884 } 9885 } 9886 return false; 9887 } 9888 9889 /** 9890 * This property is hidden and intended only for use by the Fade transition, which 9891 * animates it to produce a visual translucency that does not side-effect (or get 9892 * affected by) the real alpha property. This value is composited with the other 9893 * alpha value (and the AlphaAnimation value, when that is present) to produce 9894 * a final visual translucency result, which is what is passed into the DisplayList. 9895 * 9896 * @hide 9897 */ 9898 public void setTransitionAlpha(float alpha) { 9899 ensureTransformationInfo(); 9900 if (mTransformationInfo.mTransitionAlpha != alpha) { 9901 mTransformationInfo.mTransitionAlpha = alpha; 9902 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9903 invalidateViewProperty(true, false); 9904 if (mDisplayList != null) { 9905 mDisplayList.setAlpha(getFinalAlpha()); 9906 } 9907 } 9908 } 9909 9910 /** 9911 * Calculates the visual alpha of this view, which is a combination of the actual 9912 * alpha value and the transitionAlpha value (if set). 9913 */ 9914 private float getFinalAlpha() { 9915 if (mTransformationInfo != null) { 9916 return mTransformationInfo.mAlpha * mTransformationInfo.mTransitionAlpha; 9917 } 9918 return 1; 9919 } 9920 9921 /** 9922 * This property is hidden and intended only for use by the Fade transition, which 9923 * animates it to produce a visual translucency that does not side-effect (or get 9924 * affected by) the real alpha property. This value is composited with the other 9925 * alpha value (and the AlphaAnimation value, when that is present) to produce 9926 * a final visual translucency result, which is what is passed into the DisplayList. 9927 * 9928 * @hide 9929 */ 9930 public float getTransitionAlpha() { 9931 return mTransformationInfo != null ? mTransformationInfo.mTransitionAlpha : 1; 9932 } 9933 9934 /** 9935 * Top position of this view relative to its parent. 9936 * 9937 * @return The top of this view, in pixels. 9938 */ 9939 @ViewDebug.CapturedViewProperty 9940 public final int getTop() { 9941 return mTop; 9942 } 9943 9944 /** 9945 * Sets the top position of this view relative to its parent. This method is meant to be called 9946 * by the layout system and should not generally be called otherwise, because the property 9947 * may be changed at any time by the layout. 9948 * 9949 * @param top The top of this view, in pixels. 9950 */ 9951 public final void setTop(int top) { 9952 if (top != mTop) { 9953 updateMatrix(); 9954 final boolean matrixIsIdentity = mTransformationInfo == null 9955 || mTransformationInfo.mMatrixIsIdentity; 9956 if (matrixIsIdentity) { 9957 if (mAttachInfo != null) { 9958 int minTop; 9959 int yLoc; 9960 if (top < mTop) { 9961 minTop = top; 9962 yLoc = top - mTop; 9963 } else { 9964 minTop = mTop; 9965 yLoc = 0; 9966 } 9967 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9968 } 9969 } else { 9970 // Double-invalidation is necessary to capture view's old and new areas 9971 invalidate(true); 9972 } 9973 9974 int width = mRight - mLeft; 9975 int oldHeight = mBottom - mTop; 9976 9977 mTop = top; 9978 if (mDisplayList != null) { 9979 mDisplayList.setTop(mTop); 9980 } 9981 9982 sizeChange(width, mBottom - mTop, width, oldHeight); 9983 9984 if (!matrixIsIdentity) { 9985 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9986 // A change in dimension means an auto-centered pivot point changes, too 9987 mTransformationInfo.mMatrixDirty = true; 9988 } 9989 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9990 invalidate(true); 9991 } 9992 mBackgroundSizeChanged = true; 9993 invalidateParentIfNeeded(); 9994 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9995 // View was rejected last time it was drawn by its parent; this may have changed 9996 invalidateParentIfNeeded(); 9997 } 9998 } 9999 } 10000 10001 /** 10002 * Bottom position of this view relative to its parent. 10003 * 10004 * @return The bottom of this view, in pixels. 10005 */ 10006 @ViewDebug.CapturedViewProperty 10007 public final int getBottom() { 10008 return mBottom; 10009 } 10010 10011 /** 10012 * True if this view has changed since the last time being drawn. 10013 * 10014 * @return The dirty state of this view. 10015 */ 10016 public boolean isDirty() { 10017 return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0; 10018 } 10019 10020 /** 10021 * Sets the bottom position of this view relative to its parent. This method is meant to be 10022 * called by the layout system and should not generally be called otherwise, because the 10023 * property may be changed at any time by the layout. 10024 * 10025 * @param bottom The bottom of this view, in pixels. 10026 */ 10027 public final void setBottom(int bottom) { 10028 if (bottom != mBottom) { 10029 updateMatrix(); 10030 final boolean matrixIsIdentity = mTransformationInfo == null 10031 || mTransformationInfo.mMatrixIsIdentity; 10032 if (matrixIsIdentity) { 10033 if (mAttachInfo != null) { 10034 int maxBottom; 10035 if (bottom < mBottom) { 10036 maxBottom = mBottom; 10037 } else { 10038 maxBottom = bottom; 10039 } 10040 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 10041 } 10042 } else { 10043 // Double-invalidation is necessary to capture view's old and new areas 10044 invalidate(true); 10045 } 10046 10047 int width = mRight - mLeft; 10048 int oldHeight = mBottom - mTop; 10049 10050 mBottom = bottom; 10051 if (mDisplayList != null) { 10052 mDisplayList.setBottom(mBottom); 10053 } 10054 10055 sizeChange(width, mBottom - mTop, width, oldHeight); 10056 10057 if (!matrixIsIdentity) { 10058 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 10059 // A change in dimension means an auto-centered pivot point changes, too 10060 mTransformationInfo.mMatrixDirty = true; 10061 } 10062 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10063 invalidate(true); 10064 } 10065 mBackgroundSizeChanged = true; 10066 invalidateParentIfNeeded(); 10067 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10068 // View was rejected last time it was drawn by its parent; this may have changed 10069 invalidateParentIfNeeded(); 10070 } 10071 } 10072 } 10073 10074 /** 10075 * Left position of this view relative to its parent. 10076 * 10077 * @return The left edge of this view, in pixels. 10078 */ 10079 @ViewDebug.CapturedViewProperty 10080 public final int getLeft() { 10081 return mLeft; 10082 } 10083 10084 /** 10085 * Sets the left position of this view relative to its parent. This method is meant to be called 10086 * by the layout system and should not generally be called otherwise, because the property 10087 * may be changed at any time by the layout. 10088 * 10089 * @param left The bottom of this view, in pixels. 10090 */ 10091 public final void setLeft(int left) { 10092 if (left != mLeft) { 10093 updateMatrix(); 10094 final boolean matrixIsIdentity = mTransformationInfo == null 10095 || mTransformationInfo.mMatrixIsIdentity; 10096 if (matrixIsIdentity) { 10097 if (mAttachInfo != null) { 10098 int minLeft; 10099 int xLoc; 10100 if (left < mLeft) { 10101 minLeft = left; 10102 xLoc = left - mLeft; 10103 } else { 10104 minLeft = mLeft; 10105 xLoc = 0; 10106 } 10107 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 10108 } 10109 } else { 10110 // Double-invalidation is necessary to capture view's old and new areas 10111 invalidate(true); 10112 } 10113 10114 int oldWidth = mRight - mLeft; 10115 int height = mBottom - mTop; 10116 10117 mLeft = left; 10118 if (mDisplayList != null) { 10119 mDisplayList.setLeft(left); 10120 } 10121 10122 sizeChange(mRight - mLeft, height, oldWidth, height); 10123 10124 if (!matrixIsIdentity) { 10125 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 10126 // A change in dimension means an auto-centered pivot point changes, too 10127 mTransformationInfo.mMatrixDirty = true; 10128 } 10129 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10130 invalidate(true); 10131 } 10132 mBackgroundSizeChanged = true; 10133 invalidateParentIfNeeded(); 10134 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10135 // View was rejected last time it was drawn by its parent; this may have changed 10136 invalidateParentIfNeeded(); 10137 } 10138 } 10139 } 10140 10141 /** 10142 * Right position of this view relative to its parent. 10143 * 10144 * @return The right edge of this view, in pixels. 10145 */ 10146 @ViewDebug.CapturedViewProperty 10147 public final int getRight() { 10148 return mRight; 10149 } 10150 10151 /** 10152 * Sets the right position of this view relative to its parent. This method is meant to be called 10153 * by the layout system and should not generally be called otherwise, because the property 10154 * may be changed at any time by the layout. 10155 * 10156 * @param right The bottom of this view, in pixels. 10157 */ 10158 public final void setRight(int right) { 10159 if (right != mRight) { 10160 updateMatrix(); 10161 final boolean matrixIsIdentity = mTransformationInfo == null 10162 || mTransformationInfo.mMatrixIsIdentity; 10163 if (matrixIsIdentity) { 10164 if (mAttachInfo != null) { 10165 int maxRight; 10166 if (right < mRight) { 10167 maxRight = mRight; 10168 } else { 10169 maxRight = right; 10170 } 10171 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 10172 } 10173 } else { 10174 // Double-invalidation is necessary to capture view's old and new areas 10175 invalidate(true); 10176 } 10177 10178 int oldWidth = mRight - mLeft; 10179 int height = mBottom - mTop; 10180 10181 mRight = right; 10182 if (mDisplayList != null) { 10183 mDisplayList.setRight(mRight); 10184 } 10185 10186 sizeChange(mRight - mLeft, height, oldWidth, height); 10187 10188 if (!matrixIsIdentity) { 10189 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 10190 // A change in dimension means an auto-centered pivot point changes, too 10191 mTransformationInfo.mMatrixDirty = true; 10192 } 10193 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10194 invalidate(true); 10195 } 10196 mBackgroundSizeChanged = true; 10197 invalidateParentIfNeeded(); 10198 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10199 // View was rejected last time it was drawn by its parent; this may have changed 10200 invalidateParentIfNeeded(); 10201 } 10202 } 10203 } 10204 10205 /** 10206 * The visual x position of this view, in pixels. This is equivalent to the 10207 * {@link #setTranslationX(float) translationX} property plus the current 10208 * {@link #getLeft() left} property. 10209 * 10210 * @return The visual x position of this view, in pixels. 10211 */ 10212 @ViewDebug.ExportedProperty(category = "drawing") 10213 public float getX() { 10214 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 10215 } 10216 10217 /** 10218 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 10219 * {@link #setTranslationX(float) translationX} property to be the difference between 10220 * the x value passed in and the current {@link #getLeft() left} property. 10221 * 10222 * @param x The visual x position of this view, in pixels. 10223 */ 10224 public void setX(float x) { 10225 setTranslationX(x - mLeft); 10226 } 10227 10228 /** 10229 * The visual y position of this view, in pixels. This is equivalent to the 10230 * {@link #setTranslationY(float) translationY} property plus the current 10231 * {@link #getTop() top} property. 10232 * 10233 * @return The visual y position of this view, in pixels. 10234 */ 10235 @ViewDebug.ExportedProperty(category = "drawing") 10236 public float getY() { 10237 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 10238 } 10239 10240 /** 10241 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 10242 * {@link #setTranslationY(float) translationY} property to be the difference between 10243 * the y value passed in and the current {@link #getTop() top} property. 10244 * 10245 * @param y The visual y position of this view, in pixels. 10246 */ 10247 public void setY(float y) { 10248 setTranslationY(y - mTop); 10249 } 10250 10251 10252 /** 10253 * The horizontal location of this view relative to its {@link #getLeft() left} position. 10254 * This position is post-layout, in addition to wherever the object's 10255 * layout placed it. 10256 * 10257 * @return The horizontal position of this view relative to its left position, in pixels. 10258 */ 10259 @ViewDebug.ExportedProperty(category = "drawing") 10260 public float getTranslationX() { 10261 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 10262 } 10263 10264 /** 10265 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 10266 * This effectively positions the object post-layout, in addition to wherever the object's 10267 * layout placed it. 10268 * 10269 * @param translationX The horizontal position of this view relative to its left position, 10270 * in pixels. 10271 * 10272 * @attr ref android.R.styleable#View_translationX 10273 */ 10274 public void setTranslationX(float translationX) { 10275 ensureTransformationInfo(); 10276 final TransformationInfo info = mTransformationInfo; 10277 if (info.mTranslationX != translationX) { 10278 // Double-invalidation is necessary to capture view's old and new areas 10279 invalidateViewProperty(true, false); 10280 info.mTranslationX = translationX; 10281 info.mMatrixDirty = true; 10282 invalidateViewProperty(false, true); 10283 if (mDisplayList != null) { 10284 mDisplayList.setTranslationX(translationX); 10285 } 10286 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10287 // View was rejected last time it was drawn by its parent; this may have changed 10288 invalidateParentIfNeeded(); 10289 } 10290 } 10291 } 10292 10293 /** 10294 * The vertical location of this view relative to its {@link #getTop() top} position. 10295 * This position is post-layout, in addition to wherever the object's 10296 * layout placed it. 10297 * 10298 * @return The vertical position of this view relative to its top position, 10299 * in pixels. 10300 */ 10301 @ViewDebug.ExportedProperty(category = "drawing") 10302 public float getTranslationY() { 10303 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 10304 } 10305 10306 /** 10307 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 10308 * This effectively positions the object post-layout, in addition to wherever the object's 10309 * layout placed it. 10310 * 10311 * @param translationY The vertical position of this view relative to its top position, 10312 * in pixels. 10313 * 10314 * @attr ref android.R.styleable#View_translationY 10315 */ 10316 public void setTranslationY(float translationY) { 10317 ensureTransformationInfo(); 10318 final TransformationInfo info = mTransformationInfo; 10319 if (info.mTranslationY != translationY) { 10320 invalidateViewProperty(true, false); 10321 info.mTranslationY = translationY; 10322 info.mMatrixDirty = true; 10323 invalidateViewProperty(false, true); 10324 if (mDisplayList != null) { 10325 mDisplayList.setTranslationY(translationY); 10326 } 10327 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10328 // View was rejected last time it was drawn by its parent; this may have changed 10329 invalidateParentIfNeeded(); 10330 } 10331 } 10332 } 10333 10334 /** 10335 * Hit rectangle in parent's coordinates 10336 * 10337 * @param outRect The hit rectangle of the view. 10338 */ 10339 public void getHitRect(Rect outRect) { 10340 updateMatrix(); 10341 final TransformationInfo info = mTransformationInfo; 10342 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 10343 outRect.set(mLeft, mTop, mRight, mBottom); 10344 } else { 10345 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 10346 tmpRect.set(0, 0, getWidth(), getHeight()); 10347 info.mMatrix.mapRect(tmpRect); 10348 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 10349 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 10350 } 10351 } 10352 10353 /** 10354 * Determines whether the given point, in local coordinates is inside the view. 10355 */ 10356 /*package*/ final boolean pointInView(float localX, float localY) { 10357 return localX >= 0 && localX < (mRight - mLeft) 10358 && localY >= 0 && localY < (mBottom - mTop); 10359 } 10360 10361 /** 10362 * Utility method to determine whether the given point, in local coordinates, 10363 * is inside the view, where the area of the view is expanded by the slop factor. 10364 * This method is called while processing touch-move events to determine if the event 10365 * is still within the view. 10366 * 10367 * @hide 10368 */ 10369 public boolean pointInView(float localX, float localY, float slop) { 10370 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 10371 localY < ((mBottom - mTop) + slop); 10372 } 10373 10374 /** 10375 * When a view has focus and the user navigates away from it, the next view is searched for 10376 * starting from the rectangle filled in by this method. 10377 * 10378 * By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)}) 10379 * of the view. However, if your view maintains some idea of internal selection, 10380 * such as a cursor, or a selected row or column, you should override this method and 10381 * fill in a more specific rectangle. 10382 * 10383 * @param r The rectangle to fill in, in this view's coordinates. 10384 */ 10385 public void getFocusedRect(Rect r) { 10386 getDrawingRect(r); 10387 } 10388 10389 /** 10390 * If some part of this view is not clipped by any of its parents, then 10391 * return that area in r in global (root) coordinates. To convert r to local 10392 * coordinates (without taking possible View rotations into account), offset 10393 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 10394 * If the view is completely clipped or translated out, return false. 10395 * 10396 * @param r If true is returned, r holds the global coordinates of the 10397 * visible portion of this view. 10398 * @param globalOffset If true is returned, globalOffset holds the dx,dy 10399 * between this view and its root. globalOffet may be null. 10400 * @return true if r is non-empty (i.e. part of the view is visible at the 10401 * root level. 10402 */ 10403 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 10404 int width = mRight - mLeft; 10405 int height = mBottom - mTop; 10406 if (width > 0 && height > 0) { 10407 r.set(0, 0, width, height); 10408 if (globalOffset != null) { 10409 globalOffset.set(-mScrollX, -mScrollY); 10410 } 10411 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 10412 } 10413 return false; 10414 } 10415 10416 public final boolean getGlobalVisibleRect(Rect r) { 10417 return getGlobalVisibleRect(r, null); 10418 } 10419 10420 public final boolean getLocalVisibleRect(Rect r) { 10421 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 10422 if (getGlobalVisibleRect(r, offset)) { 10423 r.offset(-offset.x, -offset.y); // make r local 10424 return true; 10425 } 10426 return false; 10427 } 10428 10429 /** 10430 * Offset this view's vertical location by the specified number of pixels. 10431 * 10432 * @param offset the number of pixels to offset the view by 10433 */ 10434 public void offsetTopAndBottom(int offset) { 10435 if (offset != 0) { 10436 updateMatrix(); 10437 final boolean matrixIsIdentity = mTransformationInfo == null 10438 || mTransformationInfo.mMatrixIsIdentity; 10439 if (matrixIsIdentity) { 10440 if (mDisplayList != null) { 10441 invalidateViewProperty(false, false); 10442 } else { 10443 final ViewParent p = mParent; 10444 if (p != null && mAttachInfo != null) { 10445 final Rect r = mAttachInfo.mTmpInvalRect; 10446 int minTop; 10447 int maxBottom; 10448 int yLoc; 10449 if (offset < 0) { 10450 minTop = mTop + offset; 10451 maxBottom = mBottom; 10452 yLoc = offset; 10453 } else { 10454 minTop = mTop; 10455 maxBottom = mBottom + offset; 10456 yLoc = 0; 10457 } 10458 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 10459 p.invalidateChild(this, r); 10460 } 10461 } 10462 } else { 10463 invalidateViewProperty(false, false); 10464 } 10465 10466 mTop += offset; 10467 mBottom += offset; 10468 if (mDisplayList != null) { 10469 mDisplayList.offsetTopAndBottom(offset); 10470 invalidateViewProperty(false, false); 10471 } else { 10472 if (!matrixIsIdentity) { 10473 invalidateViewProperty(false, true); 10474 } 10475 invalidateParentIfNeeded(); 10476 } 10477 } 10478 } 10479 10480 /** 10481 * Offset this view's horizontal location by the specified amount of pixels. 10482 * 10483 * @param offset the number of pixels to offset the view by 10484 */ 10485 public void offsetLeftAndRight(int offset) { 10486 if (offset != 0) { 10487 updateMatrix(); 10488 final boolean matrixIsIdentity = mTransformationInfo == null 10489 || mTransformationInfo.mMatrixIsIdentity; 10490 if (matrixIsIdentity) { 10491 if (mDisplayList != null) { 10492 invalidateViewProperty(false, false); 10493 } else { 10494 final ViewParent p = mParent; 10495 if (p != null && mAttachInfo != null) { 10496 final Rect r = mAttachInfo.mTmpInvalRect; 10497 int minLeft; 10498 int maxRight; 10499 if (offset < 0) { 10500 minLeft = mLeft + offset; 10501 maxRight = mRight; 10502 } else { 10503 minLeft = mLeft; 10504 maxRight = mRight + offset; 10505 } 10506 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 10507 p.invalidateChild(this, r); 10508 } 10509 } 10510 } else { 10511 invalidateViewProperty(false, false); 10512 } 10513 10514 mLeft += offset; 10515 mRight += offset; 10516 if (mDisplayList != null) { 10517 mDisplayList.offsetLeftAndRight(offset); 10518 invalidateViewProperty(false, false); 10519 } else { 10520 if (!matrixIsIdentity) { 10521 invalidateViewProperty(false, true); 10522 } 10523 invalidateParentIfNeeded(); 10524 } 10525 } 10526 } 10527 10528 /** 10529 * Get the LayoutParams associated with this view. All views should have 10530 * layout parameters. These supply parameters to the <i>parent</i> of this 10531 * view specifying how it should be arranged. There are many subclasses of 10532 * ViewGroup.LayoutParams, and these correspond to the different subclasses 10533 * of ViewGroup that are responsible for arranging their children. 10534 * 10535 * This method may return null if this View is not attached to a parent 10536 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 10537 * was not invoked successfully. When a View is attached to a parent 10538 * ViewGroup, this method must not return null. 10539 * 10540 * @return The LayoutParams associated with this view, or null if no 10541 * parameters have been set yet 10542 */ 10543 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 10544 public ViewGroup.LayoutParams getLayoutParams() { 10545 return mLayoutParams; 10546 } 10547 10548 /** 10549 * Set the layout parameters associated with this view. These supply 10550 * parameters to the <i>parent</i> of this view specifying how it should be 10551 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 10552 * correspond to the different subclasses of ViewGroup that are responsible 10553 * for arranging their children. 10554 * 10555 * @param params The layout parameters for this view, cannot be null 10556 */ 10557 public void setLayoutParams(ViewGroup.LayoutParams params) { 10558 if (params == null) { 10559 throw new NullPointerException("Layout parameters cannot be null"); 10560 } 10561 mLayoutParams = params; 10562 resolveLayoutParams(); 10563 if (mParent instanceof ViewGroup) { 10564 ((ViewGroup) mParent).onSetLayoutParams(this, params); 10565 } 10566 requestLayout(); 10567 } 10568 10569 /** 10570 * Resolve the layout parameters depending on the resolved layout direction 10571 * 10572 * @hide 10573 */ 10574 public void resolveLayoutParams() { 10575 if (mLayoutParams != null) { 10576 mLayoutParams.resolveLayoutDirection(getLayoutDirection()); 10577 } 10578 } 10579 10580 /** 10581 * Set the scrolled position of your view. This will cause a call to 10582 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10583 * invalidated. 10584 * @param x the x position to scroll to 10585 * @param y the y position to scroll to 10586 */ 10587 public void scrollTo(int x, int y) { 10588 if (mScrollX != x || mScrollY != y) { 10589 int oldX = mScrollX; 10590 int oldY = mScrollY; 10591 mScrollX = x; 10592 mScrollY = y; 10593 invalidateParentCaches(); 10594 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 10595 if (!awakenScrollBars()) { 10596 postInvalidateOnAnimation(); 10597 } 10598 } 10599 } 10600 10601 /** 10602 * Move the scrolled position of your view. This will cause a call to 10603 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10604 * invalidated. 10605 * @param x the amount of pixels to scroll by horizontally 10606 * @param y the amount of pixels to scroll by vertically 10607 */ 10608 public void scrollBy(int x, int y) { 10609 scrollTo(mScrollX + x, mScrollY + y); 10610 } 10611 10612 /** 10613 * <p>Trigger the scrollbars to draw. When invoked this method starts an 10614 * animation to fade the scrollbars out after a default delay. If a subclass 10615 * provides animated scrolling, the start delay should equal the duration 10616 * of the scrolling animation.</p> 10617 * 10618 * <p>The animation starts only if at least one of the scrollbars is 10619 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 10620 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10621 * this method returns true, and false otherwise. If the animation is 10622 * started, this method calls {@link #invalidate()}; in that case the 10623 * caller should not call {@link #invalidate()}.</p> 10624 * 10625 * <p>This method should be invoked every time a subclass directly updates 10626 * the scroll parameters.</p> 10627 * 10628 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 10629 * and {@link #scrollTo(int, int)}.</p> 10630 * 10631 * @return true if the animation is played, false otherwise 10632 * 10633 * @see #awakenScrollBars(int) 10634 * @see #scrollBy(int, int) 10635 * @see #scrollTo(int, int) 10636 * @see #isHorizontalScrollBarEnabled() 10637 * @see #isVerticalScrollBarEnabled() 10638 * @see #setHorizontalScrollBarEnabled(boolean) 10639 * @see #setVerticalScrollBarEnabled(boolean) 10640 */ 10641 protected boolean awakenScrollBars() { 10642 return mScrollCache != null && 10643 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 10644 } 10645 10646 /** 10647 * Trigger the scrollbars to draw. 10648 * This method differs from awakenScrollBars() only in its default duration. 10649 * initialAwakenScrollBars() will show the scroll bars for longer than 10650 * usual to give the user more of a chance to notice them. 10651 * 10652 * @return true if the animation is played, false otherwise. 10653 */ 10654 private boolean initialAwakenScrollBars() { 10655 return mScrollCache != null && 10656 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 10657 } 10658 10659 /** 10660 * <p> 10661 * Trigger the scrollbars to draw. When invoked this method starts an 10662 * animation to fade the scrollbars out after a fixed delay. If a subclass 10663 * provides animated scrolling, the start delay should equal the duration of 10664 * the scrolling animation. 10665 * </p> 10666 * 10667 * <p> 10668 * The animation starts only if at least one of the scrollbars is enabled, 10669 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10670 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10671 * this method returns true, and false otherwise. If the animation is 10672 * started, this method calls {@link #invalidate()}; in that case the caller 10673 * should not call {@link #invalidate()}. 10674 * </p> 10675 * 10676 * <p> 10677 * This method should be invoked everytime a subclass directly updates the 10678 * scroll parameters. 10679 * </p> 10680 * 10681 * @param startDelay the delay, in milliseconds, after which the animation 10682 * should start; when the delay is 0, the animation starts 10683 * immediately 10684 * @return true if the animation is played, false otherwise 10685 * 10686 * @see #scrollBy(int, int) 10687 * @see #scrollTo(int, int) 10688 * @see #isHorizontalScrollBarEnabled() 10689 * @see #isVerticalScrollBarEnabled() 10690 * @see #setHorizontalScrollBarEnabled(boolean) 10691 * @see #setVerticalScrollBarEnabled(boolean) 10692 */ 10693 protected boolean awakenScrollBars(int startDelay) { 10694 return awakenScrollBars(startDelay, true); 10695 } 10696 10697 /** 10698 * <p> 10699 * Trigger the scrollbars to draw. When invoked this method starts an 10700 * animation to fade the scrollbars out after a fixed delay. If a subclass 10701 * provides animated scrolling, the start delay should equal the duration of 10702 * the scrolling animation. 10703 * </p> 10704 * 10705 * <p> 10706 * The animation starts only if at least one of the scrollbars is enabled, 10707 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10708 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10709 * this method returns true, and false otherwise. If the animation is 10710 * started, this method calls {@link #invalidate()} if the invalidate parameter 10711 * is set to true; in that case the caller 10712 * should not call {@link #invalidate()}. 10713 * </p> 10714 * 10715 * <p> 10716 * This method should be invoked everytime a subclass directly updates the 10717 * scroll parameters. 10718 * </p> 10719 * 10720 * @param startDelay the delay, in milliseconds, after which the animation 10721 * should start; when the delay is 0, the animation starts 10722 * immediately 10723 * 10724 * @param invalidate Wheter this method should call invalidate 10725 * 10726 * @return true if the animation is played, false otherwise 10727 * 10728 * @see #scrollBy(int, int) 10729 * @see #scrollTo(int, int) 10730 * @see #isHorizontalScrollBarEnabled() 10731 * @see #isVerticalScrollBarEnabled() 10732 * @see #setHorizontalScrollBarEnabled(boolean) 10733 * @see #setVerticalScrollBarEnabled(boolean) 10734 */ 10735 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 10736 final ScrollabilityCache scrollCache = mScrollCache; 10737 10738 if (scrollCache == null || !scrollCache.fadeScrollBars) { 10739 return false; 10740 } 10741 10742 if (scrollCache.scrollBar == null) { 10743 scrollCache.scrollBar = new ScrollBarDrawable(); 10744 } 10745 10746 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 10747 10748 if (invalidate) { 10749 // Invalidate to show the scrollbars 10750 postInvalidateOnAnimation(); 10751 } 10752 10753 if (scrollCache.state == ScrollabilityCache.OFF) { 10754 // FIXME: this is copied from WindowManagerService. 10755 // We should get this value from the system when it 10756 // is possible to do so. 10757 final int KEY_REPEAT_FIRST_DELAY = 750; 10758 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 10759 } 10760 10761 // Tell mScrollCache when we should start fading. This may 10762 // extend the fade start time if one was already scheduled 10763 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 10764 scrollCache.fadeStartTime = fadeStartTime; 10765 scrollCache.state = ScrollabilityCache.ON; 10766 10767 // Schedule our fader to run, unscheduling any old ones first 10768 if (mAttachInfo != null) { 10769 mAttachInfo.mHandler.removeCallbacks(scrollCache); 10770 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 10771 } 10772 10773 return true; 10774 } 10775 10776 return false; 10777 } 10778 10779 /** 10780 * Do not invalidate views which are not visible and which are not running an animation. They 10781 * will not get drawn and they should not set dirty flags as if they will be drawn 10782 */ 10783 private boolean skipInvalidate() { 10784 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 10785 (!(mParent instanceof ViewGroup) || 10786 !((ViewGroup) mParent).isViewTransitioning(this)); 10787 } 10788 /** 10789 * Mark the area defined by dirty as needing to be drawn. If the view is 10790 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 10791 * in the future. This must be called from a UI thread. To call from a non-UI 10792 * thread, call {@link #postInvalidate()}. 10793 * 10794 * WARNING: This method is destructive to dirty. 10795 * @param dirty the rectangle representing the bounds of the dirty region 10796 */ 10797 public void invalidate(Rect dirty) { 10798 if (skipInvalidate()) { 10799 return; 10800 } 10801 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10802 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10803 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10804 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10805 mPrivateFlags |= PFLAG_INVALIDATED; 10806 mPrivateFlags |= PFLAG_DIRTY; 10807 final ViewParent p = mParent; 10808 final AttachInfo ai = mAttachInfo; 10809 //noinspection PointlessBooleanExpression,ConstantConditions 10810 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10811 if (p != null && ai != null && ai.mHardwareAccelerated) { 10812 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10813 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10814 p.invalidateChild(this, null); 10815 return; 10816 } 10817 } 10818 if (p != null && ai != null) { 10819 final int scrollX = mScrollX; 10820 final int scrollY = mScrollY; 10821 final Rect r = ai.mTmpInvalRect; 10822 r.set(dirty.left - scrollX, dirty.top - scrollY, 10823 dirty.right - scrollX, dirty.bottom - scrollY); 10824 mParent.invalidateChild(this, r); 10825 } 10826 } 10827 } 10828 10829 /** 10830 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 10831 * The coordinates of the dirty rect are relative to the view. 10832 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 10833 * will be called at some point in the future. This must be called from 10834 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 10835 * @param l the left position of the dirty region 10836 * @param t the top position of the dirty region 10837 * @param r the right position of the dirty region 10838 * @param b the bottom position of the dirty region 10839 */ 10840 public void invalidate(int l, int t, int r, int b) { 10841 if (skipInvalidate()) { 10842 return; 10843 } 10844 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10845 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10846 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10847 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10848 mPrivateFlags |= PFLAG_INVALIDATED; 10849 mPrivateFlags |= PFLAG_DIRTY; 10850 final ViewParent p = mParent; 10851 final AttachInfo ai = mAttachInfo; 10852 //noinspection PointlessBooleanExpression,ConstantConditions 10853 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10854 if (p != null && ai != null && ai.mHardwareAccelerated) { 10855 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10856 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10857 p.invalidateChild(this, null); 10858 return; 10859 } 10860 } 10861 if (p != null && ai != null && l < r && t < b) { 10862 final int scrollX = mScrollX; 10863 final int scrollY = mScrollY; 10864 final Rect tmpr = ai.mTmpInvalRect; 10865 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 10866 p.invalidateChild(this, tmpr); 10867 } 10868 } 10869 } 10870 10871 /** 10872 * Invalidate the whole view. If the view is visible, 10873 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 10874 * the future. This must be called from a UI thread. To call from a non-UI thread, 10875 * call {@link #postInvalidate()}. 10876 */ 10877 public void invalidate() { 10878 invalidate(true); 10879 } 10880 10881 /** 10882 * This is where the invalidate() work actually happens. A full invalidate() 10883 * causes the drawing cache to be invalidated, but this function can be called with 10884 * invalidateCache set to false to skip that invalidation step for cases that do not 10885 * need it (for example, a component that remains at the same dimensions with the same 10886 * content). 10887 * 10888 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 10889 * well. This is usually true for a full invalidate, but may be set to false if the 10890 * View's contents or dimensions have not changed. 10891 */ 10892 void invalidate(boolean invalidateCache) { 10893 if (skipInvalidate()) { 10894 return; 10895 } 10896 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10897 (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) || 10898 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED || isOpaque() != mLastIsOpaque) { 10899 mLastIsOpaque = isOpaque(); 10900 mPrivateFlags &= ~PFLAG_DRAWN; 10901 mPrivateFlags |= PFLAG_DIRTY; 10902 if (invalidateCache) { 10903 mPrivateFlags |= PFLAG_INVALIDATED; 10904 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10905 } 10906 final AttachInfo ai = mAttachInfo; 10907 final ViewParent p = mParent; 10908 //noinspection PointlessBooleanExpression,ConstantConditions 10909 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10910 if (p != null && ai != null && ai.mHardwareAccelerated) { 10911 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10912 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10913 p.invalidateChild(this, null); 10914 return; 10915 } 10916 } 10917 10918 if (p != null && ai != null) { 10919 final Rect r = ai.mTmpInvalRect; 10920 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10921 // Don't call invalidate -- we don't want to internally scroll 10922 // our own bounds 10923 p.invalidateChild(this, r); 10924 } 10925 } 10926 } 10927 10928 /** 10929 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10930 * set any flags or handle all of the cases handled by the default invalidation methods. 10931 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10932 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10933 * walk up the hierarchy, transforming the dirty rect as necessary. 10934 * 10935 * The method also handles normal invalidation logic if display list properties are not 10936 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10937 * backup approach, to handle these cases used in the various property-setting methods. 10938 * 10939 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10940 * are not being used in this view 10941 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10942 * list properties are not being used in this view 10943 */ 10944 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10945 if (mDisplayList == null || (mPrivateFlags & PFLAG_DRAW_ANIMATION) == PFLAG_DRAW_ANIMATION) { 10946 if (invalidateParent) { 10947 invalidateParentCaches(); 10948 } 10949 if (forceRedraw) { 10950 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10951 } 10952 invalidate(false); 10953 } else { 10954 final AttachInfo ai = mAttachInfo; 10955 final ViewParent p = mParent; 10956 if (p != null && ai != null) { 10957 final Rect r = ai.mTmpInvalRect; 10958 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10959 if (mParent instanceof ViewGroup) { 10960 ((ViewGroup) mParent).invalidateChildFast(this, r); 10961 } else { 10962 mParent.invalidateChild(this, r); 10963 } 10964 } 10965 } 10966 } 10967 10968 /** 10969 * Utility method to transform a given Rect by the current matrix of this view. 10970 */ 10971 void transformRect(final Rect rect) { 10972 if (!getMatrix().isIdentity()) { 10973 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10974 boundingRect.set(rect); 10975 getMatrix().mapRect(boundingRect); 10976 rect.set((int) Math.floor(boundingRect.left), 10977 (int) Math.floor(boundingRect.top), 10978 (int) Math.ceil(boundingRect.right), 10979 (int) Math.ceil(boundingRect.bottom)); 10980 } 10981 } 10982 10983 /** 10984 * Used to indicate that the parent of this view should clear its caches. This functionality 10985 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10986 * which is necessary when various parent-managed properties of the view change, such as 10987 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10988 * clears the parent caches and does not causes an invalidate event. 10989 * 10990 * @hide 10991 */ 10992 protected void invalidateParentCaches() { 10993 if (mParent instanceof View) { 10994 ((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED; 10995 } 10996 } 10997 10998 /** 10999 * Used to indicate that the parent of this view should be invalidated. This functionality 11000 * is used to force the parent to rebuild its display list (when hardware-accelerated), 11001 * which is necessary when various parent-managed properties of the view change, such as 11002 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 11003 * an invalidation event to the parent. 11004 * 11005 * @hide 11006 */ 11007 protected void invalidateParentIfNeeded() { 11008 if (isHardwareAccelerated() && mParent instanceof View) { 11009 ((View) mParent).invalidate(true); 11010 } 11011 } 11012 11013 /** 11014 * Indicates whether this View is opaque. An opaque View guarantees that it will 11015 * draw all the pixels overlapping its bounds using a fully opaque color. 11016 * 11017 * Subclasses of View should override this method whenever possible to indicate 11018 * whether an instance is opaque. Opaque Views are treated in a special way by 11019 * the View hierarchy, possibly allowing it to perform optimizations during 11020 * invalidate/draw passes. 11021 * 11022 * @return True if this View is guaranteed to be fully opaque, false otherwise. 11023 */ 11024 @ViewDebug.ExportedProperty(category = "drawing") 11025 public boolean isOpaque() { 11026 return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK && 11027 getFinalAlpha() >= 1.0f; 11028 } 11029 11030 /** 11031 * @hide 11032 */ 11033 protected void computeOpaqueFlags() { 11034 // Opaque if: 11035 // - Has a background 11036 // - Background is opaque 11037 // - Doesn't have scrollbars or scrollbars overlay 11038 11039 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 11040 mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND; 11041 } else { 11042 mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND; 11043 } 11044 11045 final int flags = mViewFlags; 11046 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 11047 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY || 11048 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_OUTSIDE_OVERLAY) { 11049 mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS; 11050 } else { 11051 mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS; 11052 } 11053 } 11054 11055 /** 11056 * @hide 11057 */ 11058 protected boolean hasOpaqueScrollbars() { 11059 return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS; 11060 } 11061 11062 /** 11063 * @return A handler associated with the thread running the View. This 11064 * handler can be used to pump events in the UI events queue. 11065 */ 11066 public Handler getHandler() { 11067 final AttachInfo attachInfo = mAttachInfo; 11068 if (attachInfo != null) { 11069 return attachInfo.mHandler; 11070 } 11071 return null; 11072 } 11073 11074 /** 11075 * Gets the view root associated with the View. 11076 * @return The view root, or null if none. 11077 * @hide 11078 */ 11079 public ViewRootImpl getViewRootImpl() { 11080 if (mAttachInfo != null) { 11081 return mAttachInfo.mViewRootImpl; 11082 } 11083 return null; 11084 } 11085 11086 /** 11087 * <p>Causes the Runnable to be added to the message queue. 11088 * The runnable will be run on the user interface thread.</p> 11089 * 11090 * @param action The Runnable that will be executed. 11091 * 11092 * @return Returns true if the Runnable was successfully placed in to the 11093 * message queue. Returns false on failure, usually because the 11094 * looper processing the message queue is exiting. 11095 * 11096 * @see #postDelayed 11097 * @see #removeCallbacks 11098 */ 11099 public boolean post(Runnable action) { 11100 final AttachInfo attachInfo = mAttachInfo; 11101 if (attachInfo != null) { 11102 return attachInfo.mHandler.post(action); 11103 } 11104 // Assume that post will succeed later 11105 ViewRootImpl.getRunQueue().post(action); 11106 return true; 11107 } 11108 11109 /** 11110 * <p>Causes the Runnable to be added to the message queue, to be run 11111 * after the specified amount of time elapses. 11112 * The runnable will be run on the user interface thread.</p> 11113 * 11114 * @param action The Runnable that will be executed. 11115 * @param delayMillis The delay (in milliseconds) until the Runnable 11116 * will be executed. 11117 * 11118 * @return true if the Runnable was successfully placed in to the 11119 * message queue. Returns false on failure, usually because the 11120 * looper processing the message queue is exiting. Note that a 11121 * result of true does not mean the Runnable will be processed -- 11122 * if the looper is quit before the delivery time of the message 11123 * occurs then the message will be dropped. 11124 * 11125 * @see #post 11126 * @see #removeCallbacks 11127 */ 11128 public boolean postDelayed(Runnable action, long delayMillis) { 11129 final AttachInfo attachInfo = mAttachInfo; 11130 if (attachInfo != null) { 11131 return attachInfo.mHandler.postDelayed(action, delayMillis); 11132 } 11133 // Assume that post will succeed later 11134 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 11135 return true; 11136 } 11137 11138 /** 11139 * <p>Causes the Runnable to execute on the next animation time step. 11140 * The runnable will be run on the user interface thread.</p> 11141 * 11142 * @param action The Runnable that will be executed. 11143 * 11144 * @see #postOnAnimationDelayed 11145 * @see #removeCallbacks 11146 */ 11147 public void postOnAnimation(Runnable action) { 11148 final AttachInfo attachInfo = mAttachInfo; 11149 if (attachInfo != null) { 11150 attachInfo.mViewRootImpl.mChoreographer.postCallback( 11151 Choreographer.CALLBACK_ANIMATION, action, null); 11152 } else { 11153 // Assume that post will succeed later 11154 ViewRootImpl.getRunQueue().post(action); 11155 } 11156 } 11157 11158 /** 11159 * <p>Causes the Runnable to execute on the next animation time step, 11160 * after the specified amount of time elapses. 11161 * The runnable will be run on the user interface thread.</p> 11162 * 11163 * @param action The Runnable that will be executed. 11164 * @param delayMillis The delay (in milliseconds) until the Runnable 11165 * will be executed. 11166 * 11167 * @see #postOnAnimation 11168 * @see #removeCallbacks 11169 */ 11170 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 11171 final AttachInfo attachInfo = mAttachInfo; 11172 if (attachInfo != null) { 11173 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 11174 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 11175 } else { 11176 // Assume that post will succeed later 11177 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 11178 } 11179 } 11180 11181 /** 11182 * <p>Removes the specified Runnable from the message queue.</p> 11183 * 11184 * @param action The Runnable to remove from the message handling queue 11185 * 11186 * @return true if this view could ask the Handler to remove the Runnable, 11187 * false otherwise. When the returned value is true, the Runnable 11188 * may or may not have been actually removed from the message queue 11189 * (for instance, if the Runnable was not in the queue already.) 11190 * 11191 * @see #post 11192 * @see #postDelayed 11193 * @see #postOnAnimation 11194 * @see #postOnAnimationDelayed 11195 */ 11196 public boolean removeCallbacks(Runnable action) { 11197 if (action != null) { 11198 final AttachInfo attachInfo = mAttachInfo; 11199 if (attachInfo != null) { 11200 attachInfo.mHandler.removeCallbacks(action); 11201 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 11202 Choreographer.CALLBACK_ANIMATION, action, null); 11203 } else { 11204 // Assume that post will succeed later 11205 ViewRootImpl.getRunQueue().removeCallbacks(action); 11206 } 11207 } 11208 return true; 11209 } 11210 11211 /** 11212 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 11213 * Use this to invalidate the View from a non-UI thread.</p> 11214 * 11215 * <p>This method can be invoked from outside of the UI thread 11216 * only when this View is attached to a window.</p> 11217 * 11218 * @see #invalidate() 11219 * @see #postInvalidateDelayed(long) 11220 */ 11221 public void postInvalidate() { 11222 postInvalidateDelayed(0); 11223 } 11224 11225 /** 11226 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 11227 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 11228 * 11229 * <p>This method can be invoked from outside of the UI thread 11230 * only when this View is attached to a window.</p> 11231 * 11232 * @param left The left coordinate of the rectangle to invalidate. 11233 * @param top The top coordinate of the rectangle to invalidate. 11234 * @param right The right coordinate of the rectangle to invalidate. 11235 * @param bottom The bottom coordinate of the rectangle to invalidate. 11236 * 11237 * @see #invalidate(int, int, int, int) 11238 * @see #invalidate(Rect) 11239 * @see #postInvalidateDelayed(long, int, int, int, int) 11240 */ 11241 public void postInvalidate(int left, int top, int right, int bottom) { 11242 postInvalidateDelayed(0, left, top, right, bottom); 11243 } 11244 11245 /** 11246 * <p>Cause an invalidate to happen on a subsequent cycle through the event 11247 * loop. Waits for the specified amount of time.</p> 11248 * 11249 * <p>This method can be invoked from outside of the UI thread 11250 * only when this View is attached to a window.</p> 11251 * 11252 * @param delayMilliseconds the duration in milliseconds to delay the 11253 * invalidation by 11254 * 11255 * @see #invalidate() 11256 * @see #postInvalidate() 11257 */ 11258 public void postInvalidateDelayed(long delayMilliseconds) { 11259 // We try only with the AttachInfo because there's no point in invalidating 11260 // if we are not attached to our window 11261 final AttachInfo attachInfo = mAttachInfo; 11262 if (attachInfo != null) { 11263 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 11264 } 11265 } 11266 11267 /** 11268 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 11269 * through the event loop. Waits for the specified amount of time.</p> 11270 * 11271 * <p>This method can be invoked from outside of the UI thread 11272 * only when this View is attached to a window.</p> 11273 * 11274 * @param delayMilliseconds the duration in milliseconds to delay the 11275 * invalidation by 11276 * @param left The left coordinate of the rectangle to invalidate. 11277 * @param top The top coordinate of the rectangle to invalidate. 11278 * @param right The right coordinate of the rectangle to invalidate. 11279 * @param bottom The bottom coordinate of the rectangle to invalidate. 11280 * 11281 * @see #invalidate(int, int, int, int) 11282 * @see #invalidate(Rect) 11283 * @see #postInvalidate(int, int, int, int) 11284 */ 11285 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 11286 int right, int bottom) { 11287 11288 // We try only with the AttachInfo because there's no point in invalidating 11289 // if we are not attached to our window 11290 final AttachInfo attachInfo = mAttachInfo; 11291 if (attachInfo != null) { 11292 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 11293 info.target = this; 11294 info.left = left; 11295 info.top = top; 11296 info.right = right; 11297 info.bottom = bottom; 11298 11299 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 11300 } 11301 } 11302 11303 /** 11304 * <p>Cause an invalidate to happen on the next animation time step, typically the 11305 * next display frame.</p> 11306 * 11307 * <p>This method can be invoked from outside of the UI thread 11308 * only when this View is attached to a window.</p> 11309 * 11310 * @see #invalidate() 11311 */ 11312 public void postInvalidateOnAnimation() { 11313 // We try only with the AttachInfo because there's no point in invalidating 11314 // if we are not attached to our window 11315 final AttachInfo attachInfo = mAttachInfo; 11316 if (attachInfo != null) { 11317 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 11318 } 11319 } 11320 11321 /** 11322 * <p>Cause an invalidate of the specified area to happen on the next animation 11323 * time step, typically the next display frame.</p> 11324 * 11325 * <p>This method can be invoked from outside of the UI thread 11326 * only when this View is attached to a window.</p> 11327 * 11328 * @param left The left coordinate of the rectangle to invalidate. 11329 * @param top The top coordinate of the rectangle to invalidate. 11330 * @param right The right coordinate of the rectangle to invalidate. 11331 * @param bottom The bottom coordinate of the rectangle to invalidate. 11332 * 11333 * @see #invalidate(int, int, int, int) 11334 * @see #invalidate(Rect) 11335 */ 11336 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 11337 // We try only with the AttachInfo because there's no point in invalidating 11338 // if we are not attached to our window 11339 final AttachInfo attachInfo = mAttachInfo; 11340 if (attachInfo != null) { 11341 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 11342 info.target = this; 11343 info.left = left; 11344 info.top = top; 11345 info.right = right; 11346 info.bottom = bottom; 11347 11348 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 11349 } 11350 } 11351 11352 /** 11353 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 11354 * This event is sent at most once every 11355 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 11356 */ 11357 private void postSendViewScrolledAccessibilityEventCallback() { 11358 if (mSendViewScrolledAccessibilityEvent == null) { 11359 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 11360 } 11361 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 11362 mSendViewScrolledAccessibilityEvent.mIsPending = true; 11363 postDelayed(mSendViewScrolledAccessibilityEvent, 11364 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 11365 } 11366 } 11367 11368 /** 11369 * Called by a parent to request that a child update its values for mScrollX 11370 * and mScrollY if necessary. This will typically be done if the child is 11371 * animating a scroll using a {@link android.widget.Scroller Scroller} 11372 * object. 11373 */ 11374 public void computeScroll() { 11375 } 11376 11377 /** 11378 * <p>Indicate whether the horizontal edges are faded when the view is 11379 * scrolled horizontally.</p> 11380 * 11381 * @return true if the horizontal edges should are faded on scroll, false 11382 * otherwise 11383 * 11384 * @see #setHorizontalFadingEdgeEnabled(boolean) 11385 * 11386 * @attr ref android.R.styleable#View_requiresFadingEdge 11387 */ 11388 public boolean isHorizontalFadingEdgeEnabled() { 11389 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 11390 } 11391 11392 /** 11393 * <p>Define whether the horizontal edges should be faded when this view 11394 * is scrolled horizontally.</p> 11395 * 11396 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 11397 * be faded when the view is scrolled 11398 * horizontally 11399 * 11400 * @see #isHorizontalFadingEdgeEnabled() 11401 * 11402 * @attr ref android.R.styleable#View_requiresFadingEdge 11403 */ 11404 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 11405 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 11406 if (horizontalFadingEdgeEnabled) { 11407 initScrollCache(); 11408 } 11409 11410 mViewFlags ^= FADING_EDGE_HORIZONTAL; 11411 } 11412 } 11413 11414 /** 11415 * <p>Indicate whether the vertical edges are faded when the view is 11416 * scrolled horizontally.</p> 11417 * 11418 * @return true if the vertical edges should are faded on scroll, false 11419 * otherwise 11420 * 11421 * @see #setVerticalFadingEdgeEnabled(boolean) 11422 * 11423 * @attr ref android.R.styleable#View_requiresFadingEdge 11424 */ 11425 public boolean isVerticalFadingEdgeEnabled() { 11426 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 11427 } 11428 11429 /** 11430 * <p>Define whether the vertical edges should be faded when this view 11431 * is scrolled vertically.</p> 11432 * 11433 * @param verticalFadingEdgeEnabled true if the vertical edges should 11434 * be faded when the view is scrolled 11435 * vertically 11436 * 11437 * @see #isVerticalFadingEdgeEnabled() 11438 * 11439 * @attr ref android.R.styleable#View_requiresFadingEdge 11440 */ 11441 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 11442 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 11443 if (verticalFadingEdgeEnabled) { 11444 initScrollCache(); 11445 } 11446 11447 mViewFlags ^= FADING_EDGE_VERTICAL; 11448 } 11449 } 11450 11451 /** 11452 * Returns the strength, or intensity, of the top faded edge. The strength is 11453 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11454 * returns 0.0 or 1.0 but no value in between. 11455 * 11456 * Subclasses should override this method to provide a smoother fade transition 11457 * when scrolling occurs. 11458 * 11459 * @return the intensity of the top fade as a float between 0.0f and 1.0f 11460 */ 11461 protected float getTopFadingEdgeStrength() { 11462 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 11463 } 11464 11465 /** 11466 * Returns the strength, or intensity, of the bottom faded edge. The strength is 11467 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11468 * returns 0.0 or 1.0 but no value in between. 11469 * 11470 * Subclasses should override this method to provide a smoother fade transition 11471 * when scrolling occurs. 11472 * 11473 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 11474 */ 11475 protected float getBottomFadingEdgeStrength() { 11476 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 11477 computeVerticalScrollRange() ? 1.0f : 0.0f; 11478 } 11479 11480 /** 11481 * Returns the strength, or intensity, of the left faded edge. The strength is 11482 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11483 * returns 0.0 or 1.0 but no value in between. 11484 * 11485 * Subclasses should override this method to provide a smoother fade transition 11486 * when scrolling occurs. 11487 * 11488 * @return the intensity of the left fade as a float between 0.0f and 1.0f 11489 */ 11490 protected float getLeftFadingEdgeStrength() { 11491 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 11492 } 11493 11494 /** 11495 * Returns the strength, or intensity, of the right faded edge. The strength is 11496 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11497 * returns 0.0 or 1.0 but no value in between. 11498 * 11499 * Subclasses should override this method to provide a smoother fade transition 11500 * when scrolling occurs. 11501 * 11502 * @return the intensity of the right fade as a float between 0.0f and 1.0f 11503 */ 11504 protected float getRightFadingEdgeStrength() { 11505 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 11506 computeHorizontalScrollRange() ? 1.0f : 0.0f; 11507 } 11508 11509 /** 11510 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 11511 * scrollbar is not drawn by default.</p> 11512 * 11513 * @return true if the horizontal scrollbar should be painted, false 11514 * otherwise 11515 * 11516 * @see #setHorizontalScrollBarEnabled(boolean) 11517 */ 11518 public boolean isHorizontalScrollBarEnabled() { 11519 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11520 } 11521 11522 /** 11523 * <p>Define whether the horizontal scrollbar should be drawn or not. The 11524 * scrollbar is not drawn by default.</p> 11525 * 11526 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 11527 * be painted 11528 * 11529 * @see #isHorizontalScrollBarEnabled() 11530 */ 11531 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 11532 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 11533 mViewFlags ^= SCROLLBARS_HORIZONTAL; 11534 computeOpaqueFlags(); 11535 resolvePadding(); 11536 } 11537 } 11538 11539 /** 11540 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 11541 * scrollbar is not drawn by default.</p> 11542 * 11543 * @return true if the vertical scrollbar should be painted, false 11544 * otherwise 11545 * 11546 * @see #setVerticalScrollBarEnabled(boolean) 11547 */ 11548 public boolean isVerticalScrollBarEnabled() { 11549 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 11550 } 11551 11552 /** 11553 * <p>Define whether the vertical scrollbar should be drawn or not. The 11554 * scrollbar is not drawn by default.</p> 11555 * 11556 * @param verticalScrollBarEnabled true if the vertical scrollbar should 11557 * be painted 11558 * 11559 * @see #isVerticalScrollBarEnabled() 11560 */ 11561 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 11562 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 11563 mViewFlags ^= SCROLLBARS_VERTICAL; 11564 computeOpaqueFlags(); 11565 resolvePadding(); 11566 } 11567 } 11568 11569 /** 11570 * @hide 11571 */ 11572 protected void recomputePadding() { 11573 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 11574 } 11575 11576 /** 11577 * Define whether scrollbars will fade when the view is not scrolling. 11578 * 11579 * @param fadeScrollbars wheter to enable fading 11580 * 11581 * @attr ref android.R.styleable#View_fadeScrollbars 11582 */ 11583 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 11584 initScrollCache(); 11585 final ScrollabilityCache scrollabilityCache = mScrollCache; 11586 scrollabilityCache.fadeScrollBars = fadeScrollbars; 11587 if (fadeScrollbars) { 11588 scrollabilityCache.state = ScrollabilityCache.OFF; 11589 } else { 11590 scrollabilityCache.state = ScrollabilityCache.ON; 11591 } 11592 } 11593 11594 /** 11595 * 11596 * Returns true if scrollbars will fade when this view is not scrolling 11597 * 11598 * @return true if scrollbar fading is enabled 11599 * 11600 * @attr ref android.R.styleable#View_fadeScrollbars 11601 */ 11602 public boolean isScrollbarFadingEnabled() { 11603 return mScrollCache != null && mScrollCache.fadeScrollBars; 11604 } 11605 11606 /** 11607 * 11608 * Returns the delay before scrollbars fade. 11609 * 11610 * @return the delay before scrollbars fade 11611 * 11612 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11613 */ 11614 public int getScrollBarDefaultDelayBeforeFade() { 11615 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 11616 mScrollCache.scrollBarDefaultDelayBeforeFade; 11617 } 11618 11619 /** 11620 * Define the delay before scrollbars fade. 11621 * 11622 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 11623 * 11624 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11625 */ 11626 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 11627 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 11628 } 11629 11630 /** 11631 * 11632 * Returns the scrollbar fade duration. 11633 * 11634 * @return the scrollbar fade duration 11635 * 11636 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11637 */ 11638 public int getScrollBarFadeDuration() { 11639 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 11640 mScrollCache.scrollBarFadeDuration; 11641 } 11642 11643 /** 11644 * Define the scrollbar fade duration. 11645 * 11646 * @param scrollBarFadeDuration - the scrollbar fade duration 11647 * 11648 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11649 */ 11650 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 11651 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 11652 } 11653 11654 /** 11655 * 11656 * Returns the scrollbar size. 11657 * 11658 * @return the scrollbar size 11659 * 11660 * @attr ref android.R.styleable#View_scrollbarSize 11661 */ 11662 public int getScrollBarSize() { 11663 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 11664 mScrollCache.scrollBarSize; 11665 } 11666 11667 /** 11668 * Define the scrollbar size. 11669 * 11670 * @param scrollBarSize - the scrollbar size 11671 * 11672 * @attr ref android.R.styleable#View_scrollbarSize 11673 */ 11674 public void setScrollBarSize(int scrollBarSize) { 11675 getScrollCache().scrollBarSize = scrollBarSize; 11676 } 11677 11678 /** 11679 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 11680 * inset. When inset, they add to the padding of the view. And the scrollbars 11681 * can be drawn inside the padding area or on the edge of the view. For example, 11682 * if a view has a background drawable and you want to draw the scrollbars 11683 * inside the padding specified by the drawable, you can use 11684 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 11685 * appear at the edge of the view, ignoring the padding, then you can use 11686 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 11687 * @param style the style of the scrollbars. Should be one of 11688 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 11689 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 11690 * @see #SCROLLBARS_INSIDE_OVERLAY 11691 * @see #SCROLLBARS_INSIDE_INSET 11692 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11693 * @see #SCROLLBARS_OUTSIDE_INSET 11694 * 11695 * @attr ref android.R.styleable#View_scrollbarStyle 11696 */ 11697 public void setScrollBarStyle(int style) { 11698 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 11699 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 11700 computeOpaqueFlags(); 11701 resolvePadding(); 11702 } 11703 } 11704 11705 /** 11706 * <p>Returns the current scrollbar style.</p> 11707 * @return the current scrollbar style 11708 * @see #SCROLLBARS_INSIDE_OVERLAY 11709 * @see #SCROLLBARS_INSIDE_INSET 11710 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11711 * @see #SCROLLBARS_OUTSIDE_INSET 11712 * 11713 * @attr ref android.R.styleable#View_scrollbarStyle 11714 */ 11715 @ViewDebug.ExportedProperty(mapping = { 11716 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 11717 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 11718 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 11719 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 11720 }) 11721 public int getScrollBarStyle() { 11722 return mViewFlags & SCROLLBARS_STYLE_MASK; 11723 } 11724 11725 /** 11726 * <p>Compute the horizontal range that the horizontal scrollbar 11727 * represents.</p> 11728 * 11729 * <p>The range is expressed in arbitrary units that must be the same as the 11730 * units used by {@link #computeHorizontalScrollExtent()} and 11731 * {@link #computeHorizontalScrollOffset()}.</p> 11732 * 11733 * <p>The default range is the drawing width of this view.</p> 11734 * 11735 * @return the total horizontal range represented by the horizontal 11736 * scrollbar 11737 * 11738 * @see #computeHorizontalScrollExtent() 11739 * @see #computeHorizontalScrollOffset() 11740 * @see android.widget.ScrollBarDrawable 11741 */ 11742 protected int computeHorizontalScrollRange() { 11743 return getWidth(); 11744 } 11745 11746 /** 11747 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 11748 * within the horizontal range. This value is used to compute the position 11749 * of the thumb within the scrollbar's track.</p> 11750 * 11751 * <p>The range is expressed in arbitrary units that must be the same as the 11752 * units used by {@link #computeHorizontalScrollRange()} and 11753 * {@link #computeHorizontalScrollExtent()}.</p> 11754 * 11755 * <p>The default offset is the scroll offset of this view.</p> 11756 * 11757 * @return the horizontal offset of the scrollbar's thumb 11758 * 11759 * @see #computeHorizontalScrollRange() 11760 * @see #computeHorizontalScrollExtent() 11761 * @see android.widget.ScrollBarDrawable 11762 */ 11763 protected int computeHorizontalScrollOffset() { 11764 return mScrollX; 11765 } 11766 11767 /** 11768 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 11769 * within the horizontal range. This value is used to compute the length 11770 * of the thumb within the scrollbar's track.</p> 11771 * 11772 * <p>The range is expressed in arbitrary units that must be the same as the 11773 * units used by {@link #computeHorizontalScrollRange()} and 11774 * {@link #computeHorizontalScrollOffset()}.</p> 11775 * 11776 * <p>The default extent is the drawing width of this view.</p> 11777 * 11778 * @return the horizontal extent of the scrollbar's thumb 11779 * 11780 * @see #computeHorizontalScrollRange() 11781 * @see #computeHorizontalScrollOffset() 11782 * @see android.widget.ScrollBarDrawable 11783 */ 11784 protected int computeHorizontalScrollExtent() { 11785 return getWidth(); 11786 } 11787 11788 /** 11789 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 11790 * 11791 * <p>The range is expressed in arbitrary units that must be the same as the 11792 * units used by {@link #computeVerticalScrollExtent()} and 11793 * {@link #computeVerticalScrollOffset()}.</p> 11794 * 11795 * @return the total vertical range represented by the vertical scrollbar 11796 * 11797 * <p>The default range is the drawing height of this view.</p> 11798 * 11799 * @see #computeVerticalScrollExtent() 11800 * @see #computeVerticalScrollOffset() 11801 * @see android.widget.ScrollBarDrawable 11802 */ 11803 protected int computeVerticalScrollRange() { 11804 return getHeight(); 11805 } 11806 11807 /** 11808 * <p>Compute the vertical offset of the vertical scrollbar's thumb 11809 * within the horizontal range. This value is used to compute the position 11810 * of the thumb within the scrollbar's track.</p> 11811 * 11812 * <p>The range is expressed in arbitrary units that must be the same as the 11813 * units used by {@link #computeVerticalScrollRange()} and 11814 * {@link #computeVerticalScrollExtent()}.</p> 11815 * 11816 * <p>The default offset is the scroll offset of this view.</p> 11817 * 11818 * @return the vertical offset of the scrollbar's thumb 11819 * 11820 * @see #computeVerticalScrollRange() 11821 * @see #computeVerticalScrollExtent() 11822 * @see android.widget.ScrollBarDrawable 11823 */ 11824 protected int computeVerticalScrollOffset() { 11825 return mScrollY; 11826 } 11827 11828 /** 11829 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 11830 * within the vertical range. This value is used to compute the length 11831 * of the thumb within the scrollbar's track.</p> 11832 * 11833 * <p>The range is expressed in arbitrary units that must be the same as the 11834 * units used by {@link #computeVerticalScrollRange()} and 11835 * {@link #computeVerticalScrollOffset()}.</p> 11836 * 11837 * <p>The default extent is the drawing height of this view.</p> 11838 * 11839 * @return the vertical extent of the scrollbar's thumb 11840 * 11841 * @see #computeVerticalScrollRange() 11842 * @see #computeVerticalScrollOffset() 11843 * @see android.widget.ScrollBarDrawable 11844 */ 11845 protected int computeVerticalScrollExtent() { 11846 return getHeight(); 11847 } 11848 11849 /** 11850 * Check if this view can be scrolled horizontally in a certain direction. 11851 * 11852 * @param direction Negative to check scrolling left, positive to check scrolling right. 11853 * @return true if this view can be scrolled in the specified direction, false otherwise. 11854 */ 11855 public boolean canScrollHorizontally(int direction) { 11856 final int offset = computeHorizontalScrollOffset(); 11857 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 11858 if (range == 0) return false; 11859 if (direction < 0) { 11860 return offset > 0; 11861 } else { 11862 return offset < range - 1; 11863 } 11864 } 11865 11866 /** 11867 * Check if this view can be scrolled vertically in a certain direction. 11868 * 11869 * @param direction Negative to check scrolling up, positive to check scrolling down. 11870 * @return true if this view can be scrolled in the specified direction, false otherwise. 11871 */ 11872 public boolean canScrollVertically(int direction) { 11873 final int offset = computeVerticalScrollOffset(); 11874 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 11875 if (range == 0) return false; 11876 if (direction < 0) { 11877 return offset > 0; 11878 } else { 11879 return offset < range - 1; 11880 } 11881 } 11882 11883 /** 11884 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11885 * scrollbars are painted only if they have been awakened first.</p> 11886 * 11887 * @param canvas the canvas on which to draw the scrollbars 11888 * 11889 * @see #awakenScrollBars(int) 11890 */ 11891 protected final void onDrawScrollBars(Canvas canvas) { 11892 // scrollbars are drawn only when the animation is running 11893 final ScrollabilityCache cache = mScrollCache; 11894 if (cache != null) { 11895 11896 int state = cache.state; 11897 11898 if (state == ScrollabilityCache.OFF) { 11899 return; 11900 } 11901 11902 boolean invalidate = false; 11903 11904 if (state == ScrollabilityCache.FADING) { 11905 // We're fading -- get our fade interpolation 11906 if (cache.interpolatorValues == null) { 11907 cache.interpolatorValues = new float[1]; 11908 } 11909 11910 float[] values = cache.interpolatorValues; 11911 11912 // Stops the animation if we're done 11913 if (cache.scrollBarInterpolator.timeToValues(values) == 11914 Interpolator.Result.FREEZE_END) { 11915 cache.state = ScrollabilityCache.OFF; 11916 } else { 11917 cache.scrollBar.setAlpha(Math.round(values[0])); 11918 } 11919 11920 // This will make the scroll bars inval themselves after 11921 // drawing. We only want this when we're fading so that 11922 // we prevent excessive redraws 11923 invalidate = true; 11924 } else { 11925 // We're just on -- but we may have been fading before so 11926 // reset alpha 11927 cache.scrollBar.setAlpha(255); 11928 } 11929 11930 11931 final int viewFlags = mViewFlags; 11932 11933 final boolean drawHorizontalScrollBar = 11934 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11935 final boolean drawVerticalScrollBar = 11936 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11937 && !isVerticalScrollBarHidden(); 11938 11939 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11940 final int width = mRight - mLeft; 11941 final int height = mBottom - mTop; 11942 11943 final ScrollBarDrawable scrollBar = cache.scrollBar; 11944 11945 final int scrollX = mScrollX; 11946 final int scrollY = mScrollY; 11947 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11948 11949 int left; 11950 int top; 11951 int right; 11952 int bottom; 11953 11954 if (drawHorizontalScrollBar) { 11955 int size = scrollBar.getSize(false); 11956 if (size <= 0) { 11957 size = cache.scrollBarSize; 11958 } 11959 11960 scrollBar.setParameters(computeHorizontalScrollRange(), 11961 computeHorizontalScrollOffset(), 11962 computeHorizontalScrollExtent(), false); 11963 final int verticalScrollBarGap = drawVerticalScrollBar ? 11964 getVerticalScrollbarWidth() : 0; 11965 top = scrollY + height - size - (mUserPaddingBottom & inside); 11966 left = scrollX + (mPaddingLeft & inside); 11967 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11968 bottom = top + size; 11969 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11970 if (invalidate) { 11971 invalidate(left, top, right, bottom); 11972 } 11973 } 11974 11975 if (drawVerticalScrollBar) { 11976 int size = scrollBar.getSize(true); 11977 if (size <= 0) { 11978 size = cache.scrollBarSize; 11979 } 11980 11981 scrollBar.setParameters(computeVerticalScrollRange(), 11982 computeVerticalScrollOffset(), 11983 computeVerticalScrollExtent(), true); 11984 int verticalScrollbarPosition = mVerticalScrollbarPosition; 11985 if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) { 11986 verticalScrollbarPosition = isLayoutRtl() ? 11987 SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT; 11988 } 11989 switch (verticalScrollbarPosition) { 11990 default: 11991 case SCROLLBAR_POSITION_RIGHT: 11992 left = scrollX + width - size - (mUserPaddingRight & inside); 11993 break; 11994 case SCROLLBAR_POSITION_LEFT: 11995 left = scrollX + (mUserPaddingLeft & inside); 11996 break; 11997 } 11998 top = scrollY + (mPaddingTop & inside); 11999 right = left + size; 12000 bottom = scrollY + height - (mUserPaddingBottom & inside); 12001 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 12002 if (invalidate) { 12003 invalidate(left, top, right, bottom); 12004 } 12005 } 12006 } 12007 } 12008 } 12009 12010 /** 12011 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 12012 * FastScroller is visible. 12013 * @return whether to temporarily hide the vertical scrollbar 12014 * @hide 12015 */ 12016 protected boolean isVerticalScrollBarHidden() { 12017 return false; 12018 } 12019 12020 /** 12021 * <p>Draw the horizontal scrollbar if 12022 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 12023 * 12024 * @param canvas the canvas on which to draw the scrollbar 12025 * @param scrollBar the scrollbar's drawable 12026 * 12027 * @see #isHorizontalScrollBarEnabled() 12028 * @see #computeHorizontalScrollRange() 12029 * @see #computeHorizontalScrollExtent() 12030 * @see #computeHorizontalScrollOffset() 12031 * @see android.widget.ScrollBarDrawable 12032 * @hide 12033 */ 12034 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 12035 int l, int t, int r, int b) { 12036 scrollBar.setBounds(l, t, r, b); 12037 scrollBar.draw(canvas); 12038 } 12039 12040 /** 12041 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 12042 * returns true.</p> 12043 * 12044 * @param canvas the canvas on which to draw the scrollbar 12045 * @param scrollBar the scrollbar's drawable 12046 * 12047 * @see #isVerticalScrollBarEnabled() 12048 * @see #computeVerticalScrollRange() 12049 * @see #computeVerticalScrollExtent() 12050 * @see #computeVerticalScrollOffset() 12051 * @see android.widget.ScrollBarDrawable 12052 * @hide 12053 */ 12054 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 12055 int l, int t, int r, int b) { 12056 scrollBar.setBounds(l, t, r, b); 12057 scrollBar.draw(canvas); 12058 } 12059 12060 /** 12061 * Implement this to do your drawing. 12062 * 12063 * @param canvas the canvas on which the background will be drawn 12064 */ 12065 protected void onDraw(Canvas canvas) { 12066 } 12067 12068 /* 12069 * Caller is responsible for calling requestLayout if necessary. 12070 * (This allows addViewInLayout to not request a new layout.) 12071 */ 12072 void assignParent(ViewParent parent) { 12073 if (mParent == null) { 12074 mParent = parent; 12075 } else if (parent == null) { 12076 mParent = null; 12077 } else { 12078 throw new RuntimeException("view " + this + " being added, but" 12079 + " it already has a parent"); 12080 } 12081 } 12082 12083 /** 12084 * This is called when the view is attached to a window. At this point it 12085 * has a Surface and will start drawing. Note that this function is 12086 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 12087 * however it may be called any time before the first onDraw -- including 12088 * before or after {@link #onMeasure(int, int)}. 12089 * 12090 * @see #onDetachedFromWindow() 12091 */ 12092 protected void onAttachedToWindow() { 12093 if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) { 12094 mParent.requestTransparentRegion(this); 12095 } 12096 12097 if ((mPrivateFlags & PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 12098 initialAwakenScrollBars(); 12099 mPrivateFlags &= ~PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 12100 } 12101 12102 mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; 12103 12104 jumpDrawablesToCurrentState(); 12105 12106 resetSubtreeAccessibilityStateChanged(); 12107 12108 if (isFocused()) { 12109 InputMethodManager imm = InputMethodManager.peekInstance(); 12110 imm.focusIn(this); 12111 } 12112 12113 if (mDisplayList != null) { 12114 mDisplayList.clearDirty(); 12115 } 12116 } 12117 12118 /** 12119 * Resolve all RTL related properties. 12120 * 12121 * @return true if resolution of RTL properties has been done 12122 * 12123 * @hide 12124 */ 12125 public boolean resolveRtlPropertiesIfNeeded() { 12126 if (!needRtlPropertiesResolution()) return false; 12127 12128 // Order is important here: LayoutDirection MUST be resolved first 12129 if (!isLayoutDirectionResolved()) { 12130 resolveLayoutDirection(); 12131 resolveLayoutParams(); 12132 } 12133 // ... then we can resolve the others properties depending on the resolved LayoutDirection. 12134 if (!isTextDirectionResolved()) { 12135 resolveTextDirection(); 12136 } 12137 if (!isTextAlignmentResolved()) { 12138 resolveTextAlignment(); 12139 } 12140 // Should resolve Drawables before Padding because we need the layout direction of the 12141 // Drawable to correctly resolve Padding. 12142 if (!isDrawablesResolved()) { 12143 resolveDrawables(); 12144 } 12145 if (!isPaddingResolved()) { 12146 resolvePadding(); 12147 } 12148 onRtlPropertiesChanged(getLayoutDirection()); 12149 return true; 12150 } 12151 12152 /** 12153 * Reset resolution of all RTL related properties. 12154 * 12155 * @hide 12156 */ 12157 public void resetRtlProperties() { 12158 resetResolvedLayoutDirection(); 12159 resetResolvedTextDirection(); 12160 resetResolvedTextAlignment(); 12161 resetResolvedPadding(); 12162 resetResolvedDrawables(); 12163 } 12164 12165 /** 12166 * @see #onScreenStateChanged(int) 12167 */ 12168 void dispatchScreenStateChanged(int screenState) { 12169 onScreenStateChanged(screenState); 12170 } 12171 12172 /** 12173 * This method is called whenever the state of the screen this view is 12174 * attached to changes. A state change will usually occurs when the screen 12175 * turns on or off (whether it happens automatically or the user does it 12176 * manually.) 12177 * 12178 * @param screenState The new state of the screen. Can be either 12179 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 12180 */ 12181 public void onScreenStateChanged(int screenState) { 12182 } 12183 12184 /** 12185 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 12186 */ 12187 private boolean hasRtlSupport() { 12188 return mContext.getApplicationInfo().hasRtlSupport(); 12189 } 12190 12191 /** 12192 * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or 12193 * RTL not supported) 12194 */ 12195 private boolean isRtlCompatibilityMode() { 12196 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 12197 return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport(); 12198 } 12199 12200 /** 12201 * @return true if RTL properties need resolution. 12202 * 12203 */ 12204 private boolean needRtlPropertiesResolution() { 12205 return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED; 12206 } 12207 12208 /** 12209 * Called when any RTL property (layout direction or text direction or text alignment) has 12210 * been changed. 12211 * 12212 * Subclasses need to override this method to take care of cached information that depends on the 12213 * resolved layout direction, or to inform child views that inherit their layout direction. 12214 * 12215 * The default implementation does nothing. 12216 * 12217 * @param layoutDirection the direction of the layout 12218 * 12219 * @see #LAYOUT_DIRECTION_LTR 12220 * @see #LAYOUT_DIRECTION_RTL 12221 */ 12222 public void onRtlPropertiesChanged(int layoutDirection) { 12223 } 12224 12225 /** 12226 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 12227 * that the parent directionality can and will be resolved before its children. 12228 * 12229 * @return true if resolution has been done, false otherwise. 12230 * 12231 * @hide 12232 */ 12233 public boolean resolveLayoutDirection() { 12234 // Clear any previous layout direction resolution 12235 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 12236 12237 if (hasRtlSupport()) { 12238 // Set resolved depending on layout direction 12239 switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> 12240 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) { 12241 case LAYOUT_DIRECTION_INHERIT: 12242 // We cannot resolve yet. LTR is by default and let the resolution happen again 12243 // later to get the correct resolved value 12244 if (!canResolveLayoutDirection()) return false; 12245 12246 // Parent has not yet resolved, LTR is still the default 12247 try { 12248 if (!mParent.isLayoutDirectionResolved()) return false; 12249 12250 if (mParent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) { 12251 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 12252 } 12253 } catch (AbstractMethodError e) { 12254 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 12255 " does not fully implement ViewParent", e); 12256 } 12257 break; 12258 case LAYOUT_DIRECTION_RTL: 12259 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 12260 break; 12261 case LAYOUT_DIRECTION_LOCALE: 12262 if((LAYOUT_DIRECTION_RTL == 12263 TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) { 12264 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 12265 } 12266 break; 12267 default: 12268 // Nothing to do, LTR by default 12269 } 12270 } 12271 12272 // Set to resolved 12273 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 12274 return true; 12275 } 12276 12277 /** 12278 * Check if layout direction resolution can be done. 12279 * 12280 * @return true if layout direction resolution can be done otherwise return false. 12281 */ 12282 public boolean canResolveLayoutDirection() { 12283 switch (getRawLayoutDirection()) { 12284 case LAYOUT_DIRECTION_INHERIT: 12285 if (mParent != null) { 12286 try { 12287 return mParent.canResolveLayoutDirection(); 12288 } catch (AbstractMethodError e) { 12289 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 12290 " does not fully implement ViewParent", e); 12291 } 12292 } 12293 return false; 12294 12295 default: 12296 return true; 12297 } 12298 } 12299 12300 /** 12301 * Reset the resolved layout direction. Layout direction will be resolved during a call to 12302 * {@link #onMeasure(int, int)}. 12303 * 12304 * @hide 12305 */ 12306 public void resetResolvedLayoutDirection() { 12307 // Reset the current resolved bits 12308 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 12309 } 12310 12311 /** 12312 * @return true if the layout direction is inherited. 12313 * 12314 * @hide 12315 */ 12316 public boolean isLayoutDirectionInherited() { 12317 return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT); 12318 } 12319 12320 /** 12321 * @return true if layout direction has been resolved. 12322 */ 12323 public boolean isLayoutDirectionResolved() { 12324 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED; 12325 } 12326 12327 /** 12328 * Return if padding has been resolved 12329 * 12330 * @hide 12331 */ 12332 boolean isPaddingResolved() { 12333 return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED; 12334 } 12335 12336 /** 12337 * Resolves padding depending on layout direction, if applicable, and 12338 * recomputes internal padding values to adjust for scroll bars. 12339 * 12340 * @hide 12341 */ 12342 public void resolvePadding() { 12343 final int resolvedLayoutDirection = getLayoutDirection(); 12344 12345 if (!isRtlCompatibilityMode()) { 12346 // Post Jelly Bean MR1 case: we need to take the resolved layout direction into account. 12347 // If start / end padding are defined, they will be resolved (hence overriding) to 12348 // left / right or right / left depending on the resolved layout direction. 12349 // If start / end padding are not defined, use the left / right ones. 12350 if (mBackground != null && mUseBackgroundPadding) { 12351 Rect padding = sThreadLocal.get(); 12352 if (padding == null) { 12353 padding = new Rect(); 12354 sThreadLocal.set(padding); 12355 } 12356 mBackground.getPadding(padding); 12357 mUserPaddingLeftInitial = padding.left; 12358 mUserPaddingRightInitial = padding.right; 12359 } 12360 switch (resolvedLayoutDirection) { 12361 case LAYOUT_DIRECTION_RTL: 12362 if (mUserPaddingStart != UNDEFINED_PADDING) { 12363 mUserPaddingRight = mUserPaddingStart; 12364 } else { 12365 mUserPaddingRight = mUserPaddingRightInitial; 12366 } 12367 if (mUserPaddingEnd != UNDEFINED_PADDING) { 12368 mUserPaddingLeft = mUserPaddingEnd; 12369 } else { 12370 mUserPaddingLeft = mUserPaddingLeftInitial; 12371 } 12372 break; 12373 case LAYOUT_DIRECTION_LTR: 12374 default: 12375 if (mUserPaddingStart != UNDEFINED_PADDING) { 12376 mUserPaddingLeft = mUserPaddingStart; 12377 } else { 12378 mUserPaddingLeft = mUserPaddingLeftInitial; 12379 } 12380 if (mUserPaddingEnd != UNDEFINED_PADDING) { 12381 mUserPaddingRight = mUserPaddingEnd; 12382 } else { 12383 mUserPaddingRight = mUserPaddingRightInitial; 12384 } 12385 } 12386 12387 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 12388 } 12389 12390 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 12391 onRtlPropertiesChanged(resolvedLayoutDirection); 12392 12393 mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED; 12394 } 12395 12396 /** 12397 * Reset the resolved layout direction. 12398 * 12399 * @hide 12400 */ 12401 public void resetResolvedPadding() { 12402 mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED; 12403 } 12404 12405 /** 12406 * This is called when the view is detached from a window. At this point it 12407 * no longer has a surface for drawing. 12408 * 12409 * @see #onAttachedToWindow() 12410 */ 12411 protected void onDetachedFromWindow() { 12412 mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 12413 mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; 12414 12415 removeUnsetPressCallback(); 12416 removeLongPressCallback(); 12417 removePerformClickCallback(); 12418 removeSendViewScrolledAccessibilityEventCallback(); 12419 12420 destroyDrawingCache(); 12421 destroyLayer(false); 12422 12423 cleanupDraw(); 12424 12425 mCurrentAnimation = null; 12426 } 12427 12428 private void cleanupDraw() { 12429 if (mAttachInfo != null) { 12430 if (mDisplayList != null) { 12431 mDisplayList.markDirty(); 12432 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 12433 } 12434 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 12435 } else { 12436 // Should never happen 12437 resetDisplayList(); 12438 } 12439 } 12440 12441 /** 12442 * This method ensures the hardware renderer is in a valid state 12443 * before executing the specified action. 12444 * 12445 * This method will attempt to set a valid state even if the window 12446 * the renderer is attached to was destroyed. 12447 * 12448 * This method is not guaranteed to work. If the hardware renderer 12449 * does not exist or cannot be put in a valid state, this method 12450 * will not executed the specified action. 12451 * 12452 * The specified action is executed synchronously. 12453 * 12454 * @param action The action to execute after the renderer is in a valid state 12455 * 12456 * @return True if the specified Runnable was executed, false otherwise 12457 * 12458 * @hide 12459 */ 12460 public boolean executeHardwareAction(Runnable action) { 12461 //noinspection SimplifiableIfStatement 12462 if (mAttachInfo != null && mAttachInfo.mHardwareRenderer != null) { 12463 return mAttachInfo.mHardwareRenderer.safelyRun(action); 12464 } 12465 return false; 12466 } 12467 12468 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 12469 } 12470 12471 /** 12472 * @return The number of times this view has been attached to a window 12473 */ 12474 protected int getWindowAttachCount() { 12475 return mWindowAttachCount; 12476 } 12477 12478 /** 12479 * Retrieve a unique token identifying the window this view is attached to. 12480 * @return Return the window's token for use in 12481 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 12482 */ 12483 public IBinder getWindowToken() { 12484 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 12485 } 12486 12487 /** 12488 * Retrieve the {@link WindowId} for the window this view is 12489 * currently attached to. 12490 */ 12491 public WindowId getWindowId() { 12492 if (mAttachInfo == null) { 12493 return null; 12494 } 12495 if (mAttachInfo.mWindowId == null) { 12496 try { 12497 mAttachInfo.mIWindowId = mAttachInfo.mSession.getWindowId( 12498 mAttachInfo.mWindowToken); 12499 mAttachInfo.mWindowId = new WindowId( 12500 mAttachInfo.mIWindowId); 12501 } catch (RemoteException e) { 12502 } 12503 } 12504 return mAttachInfo.mWindowId; 12505 } 12506 12507 /** 12508 * Retrieve a unique token identifying the top-level "real" window of 12509 * the window that this view is attached to. That is, this is like 12510 * {@link #getWindowToken}, except if the window this view in is a panel 12511 * window (attached to another containing window), then the token of 12512 * the containing window is returned instead. 12513 * 12514 * @return Returns the associated window token, either 12515 * {@link #getWindowToken()} or the containing window's token. 12516 */ 12517 public IBinder getApplicationWindowToken() { 12518 AttachInfo ai = mAttachInfo; 12519 if (ai != null) { 12520 IBinder appWindowToken = ai.mPanelParentWindowToken; 12521 if (appWindowToken == null) { 12522 appWindowToken = ai.mWindowToken; 12523 } 12524 return appWindowToken; 12525 } 12526 return null; 12527 } 12528 12529 /** 12530 * Gets the logical display to which the view's window has been attached. 12531 * 12532 * @return The logical display, or null if the view is not currently attached to a window. 12533 */ 12534 public Display getDisplay() { 12535 return mAttachInfo != null ? mAttachInfo.mDisplay : null; 12536 } 12537 12538 /** 12539 * Retrieve private session object this view hierarchy is using to 12540 * communicate with the window manager. 12541 * @return the session object to communicate with the window manager 12542 */ 12543 /*package*/ IWindowSession getWindowSession() { 12544 return mAttachInfo != null ? mAttachInfo.mSession : null; 12545 } 12546 12547 /** 12548 * @param info the {@link android.view.View.AttachInfo} to associated with 12549 * this view 12550 */ 12551 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 12552 //System.out.println("Attached! " + this); 12553 mAttachInfo = info; 12554 if (mOverlay != null) { 12555 mOverlay.getOverlayView().dispatchAttachedToWindow(info, visibility); 12556 } 12557 mWindowAttachCount++; 12558 // We will need to evaluate the drawable state at least once. 12559 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 12560 if (mFloatingTreeObserver != null) { 12561 info.mTreeObserver.merge(mFloatingTreeObserver); 12562 mFloatingTreeObserver = null; 12563 } 12564 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) { 12565 mAttachInfo.mScrollContainers.add(this); 12566 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 12567 } 12568 performCollectViewAttributes(mAttachInfo, visibility); 12569 onAttachedToWindow(); 12570 12571 ListenerInfo li = mListenerInfo; 12572 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12573 li != null ? li.mOnAttachStateChangeListeners : null; 12574 if (listeners != null && listeners.size() > 0) { 12575 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12576 // perform the dispatching. The iterator is a safe guard against listeners that 12577 // could mutate the list by calling the various add/remove methods. This prevents 12578 // the array from being modified while we iterate it. 12579 for (OnAttachStateChangeListener listener : listeners) { 12580 listener.onViewAttachedToWindow(this); 12581 } 12582 } 12583 12584 int vis = info.mWindowVisibility; 12585 if (vis != GONE) { 12586 onWindowVisibilityChanged(vis); 12587 } 12588 if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) { 12589 // If nobody has evaluated the drawable state yet, then do it now. 12590 refreshDrawableState(); 12591 } 12592 needGlobalAttributesUpdate(false); 12593 } 12594 12595 void dispatchDetachedFromWindow() { 12596 AttachInfo info = mAttachInfo; 12597 if (info != null) { 12598 int vis = info.mWindowVisibility; 12599 if (vis != GONE) { 12600 onWindowVisibilityChanged(GONE); 12601 } 12602 } 12603 12604 onDetachedFromWindow(); 12605 12606 ListenerInfo li = mListenerInfo; 12607 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12608 li != null ? li.mOnAttachStateChangeListeners : null; 12609 if (listeners != null && listeners.size() > 0) { 12610 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12611 // perform the dispatching. The iterator is a safe guard against listeners that 12612 // could mutate the list by calling the various add/remove methods. This prevents 12613 // the array from being modified while we iterate it. 12614 for (OnAttachStateChangeListener listener : listeners) { 12615 listener.onViewDetachedFromWindow(this); 12616 } 12617 } 12618 12619 if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 12620 mAttachInfo.mScrollContainers.remove(this); 12621 mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED; 12622 } 12623 12624 mAttachInfo = null; 12625 if (mOverlay != null) { 12626 mOverlay.getOverlayView().dispatchDetachedFromWindow(); 12627 } 12628 } 12629 12630 /** 12631 * Cancel any deferred high-level input events that were previously posted to the event queue. 12632 * 12633 * <p>Many views post high-level events such as click handlers to the event queue 12634 * to run deferred in order to preserve a desired user experience - clearing visible 12635 * pressed states before executing, etc. This method will abort any events of this nature 12636 * that are currently in flight.</p> 12637 * 12638 * <p>Custom views that generate their own high-level deferred input events should override 12639 * {@link #onCancelPendingInputEvents()} and remove those pending events from the queue.</p> 12640 * 12641 * <p>This will also cancel pending input events for any child views.</p> 12642 * 12643 * <p>Note that this may not be sufficient as a debouncing strategy for clicks in all cases. 12644 * This will not impact newer events posted after this call that may occur as a result of 12645 * lower-level input events still waiting in the queue. If you are trying to prevent 12646 * double-submitted events for the duration of some sort of asynchronous transaction 12647 * you should also take other steps to protect against unexpected double inputs e.g. calling 12648 * {@link #setEnabled(boolean) setEnabled(false)} and re-enabling the view when 12649 * the transaction completes, tracking already submitted transaction IDs, etc.</p> 12650 */ 12651 public final void cancelPendingInputEvents() { 12652 dispatchCancelPendingInputEvents(); 12653 } 12654 12655 /** 12656 * Called by {@link #cancelPendingInputEvents()} to cancel input events in flight. 12657 * Overridden by ViewGroup to dispatch. Package scoped to prevent app-side meddling. 12658 */ 12659 void dispatchCancelPendingInputEvents() { 12660 mPrivateFlags3 &= ~PFLAG3_CALLED_SUPER; 12661 onCancelPendingInputEvents(); 12662 if ((mPrivateFlags3 & PFLAG3_CALLED_SUPER) != PFLAG3_CALLED_SUPER) { 12663 throw new SuperNotCalledException("View " + getClass().getSimpleName() + 12664 " did not call through to super.onCancelPendingInputEvents()"); 12665 } 12666 } 12667 12668 /** 12669 * Called as the result of a call to {@link #cancelPendingInputEvents()} on this view or 12670 * a parent view. 12671 * 12672 * <p>This method is responsible for removing any pending high-level input events that were 12673 * posted to the event queue to run later. Custom view classes that post their own deferred 12674 * high-level events via {@link #post(Runnable)}, {@link #postDelayed(Runnable, long)} or 12675 * {@link android.os.Handler} should override this method, call 12676 * <code>super.onCancelPendingInputEvents()</code> and remove those callbacks as appropriate. 12677 * </p> 12678 */ 12679 public void onCancelPendingInputEvents() { 12680 removePerformClickCallback(); 12681 cancelLongPress(); 12682 mPrivateFlags3 |= PFLAG3_CALLED_SUPER; 12683 } 12684 12685 /** 12686 * Store this view hierarchy's frozen state into the given container. 12687 * 12688 * @param container The SparseArray in which to save the view's state. 12689 * 12690 * @see #restoreHierarchyState(android.util.SparseArray) 12691 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12692 * @see #onSaveInstanceState() 12693 */ 12694 public void saveHierarchyState(SparseArray<Parcelable> container) { 12695 dispatchSaveInstanceState(container); 12696 } 12697 12698 /** 12699 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 12700 * this view and its children. May be overridden to modify how freezing happens to a 12701 * view's children; for example, some views may want to not store state for their children. 12702 * 12703 * @param container The SparseArray in which to save the view's state. 12704 * 12705 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12706 * @see #saveHierarchyState(android.util.SparseArray) 12707 * @see #onSaveInstanceState() 12708 */ 12709 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 12710 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 12711 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12712 Parcelable state = onSaveInstanceState(); 12713 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12714 throw new IllegalStateException( 12715 "Derived class did not call super.onSaveInstanceState()"); 12716 } 12717 if (state != null) { 12718 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 12719 // + ": " + state); 12720 container.put(mID, state); 12721 } 12722 } 12723 } 12724 12725 /** 12726 * Hook allowing a view to generate a representation of its internal state 12727 * that can later be used to create a new instance with that same state. 12728 * This state should only contain information that is not persistent or can 12729 * not be reconstructed later. For example, you will never store your 12730 * current position on screen because that will be computed again when a 12731 * new instance of the view is placed in its view hierarchy. 12732 * <p> 12733 * Some examples of things you may store here: the current cursor position 12734 * in a text view (but usually not the text itself since that is stored in a 12735 * content provider or other persistent storage), the currently selected 12736 * item in a list view. 12737 * 12738 * @return Returns a Parcelable object containing the view's current dynamic 12739 * state, or null if there is nothing interesting to save. The 12740 * default implementation returns null. 12741 * @see #onRestoreInstanceState(android.os.Parcelable) 12742 * @see #saveHierarchyState(android.util.SparseArray) 12743 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12744 * @see #setSaveEnabled(boolean) 12745 */ 12746 protected Parcelable onSaveInstanceState() { 12747 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12748 return BaseSavedState.EMPTY_STATE; 12749 } 12750 12751 /** 12752 * Restore this view hierarchy's frozen state from the given container. 12753 * 12754 * @param container The SparseArray which holds previously frozen states. 12755 * 12756 * @see #saveHierarchyState(android.util.SparseArray) 12757 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12758 * @see #onRestoreInstanceState(android.os.Parcelable) 12759 */ 12760 public void restoreHierarchyState(SparseArray<Parcelable> container) { 12761 dispatchRestoreInstanceState(container); 12762 } 12763 12764 /** 12765 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 12766 * state for this view and its children. May be overridden to modify how restoring 12767 * happens to a view's children; for example, some views may want to not store state 12768 * for their children. 12769 * 12770 * @param container The SparseArray which holds previously saved state. 12771 * 12772 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12773 * @see #restoreHierarchyState(android.util.SparseArray) 12774 * @see #onRestoreInstanceState(android.os.Parcelable) 12775 */ 12776 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 12777 if (mID != NO_ID) { 12778 Parcelable state = container.get(mID); 12779 if (state != null) { 12780 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 12781 // + ": " + state); 12782 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12783 onRestoreInstanceState(state); 12784 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12785 throw new IllegalStateException( 12786 "Derived class did not call super.onRestoreInstanceState()"); 12787 } 12788 } 12789 } 12790 } 12791 12792 /** 12793 * Hook allowing a view to re-apply a representation of its internal state that had previously 12794 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 12795 * null state. 12796 * 12797 * @param state The frozen state that had previously been returned by 12798 * {@link #onSaveInstanceState}. 12799 * 12800 * @see #onSaveInstanceState() 12801 * @see #restoreHierarchyState(android.util.SparseArray) 12802 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12803 */ 12804 protected void onRestoreInstanceState(Parcelable state) { 12805 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12806 if (state != BaseSavedState.EMPTY_STATE && state != null) { 12807 throw new IllegalArgumentException("Wrong state class, expecting View State but " 12808 + "received " + state.getClass().toString() + " instead. This usually happens " 12809 + "when two views of different type have the same id in the same hierarchy. " 12810 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 12811 + "other views do not use the same id."); 12812 } 12813 } 12814 12815 /** 12816 * <p>Return the time at which the drawing of the view hierarchy started.</p> 12817 * 12818 * @return the drawing start time in milliseconds 12819 */ 12820 public long getDrawingTime() { 12821 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 12822 } 12823 12824 /** 12825 * <p>Enables or disables the duplication of the parent's state into this view. When 12826 * duplication is enabled, this view gets its drawable state from its parent rather 12827 * than from its own internal properties.</p> 12828 * 12829 * <p>Note: in the current implementation, setting this property to true after the 12830 * view was added to a ViewGroup might have no effect at all. This property should 12831 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 12832 * 12833 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 12834 * property is enabled, an exception will be thrown.</p> 12835 * 12836 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 12837 * parent, these states should not be affected by this method.</p> 12838 * 12839 * @param enabled True to enable duplication of the parent's drawable state, false 12840 * to disable it. 12841 * 12842 * @see #getDrawableState() 12843 * @see #isDuplicateParentStateEnabled() 12844 */ 12845 public void setDuplicateParentStateEnabled(boolean enabled) { 12846 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 12847 } 12848 12849 /** 12850 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 12851 * 12852 * @return True if this view's drawable state is duplicated from the parent, 12853 * false otherwise 12854 * 12855 * @see #getDrawableState() 12856 * @see #setDuplicateParentStateEnabled(boolean) 12857 */ 12858 public boolean isDuplicateParentStateEnabled() { 12859 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 12860 } 12861 12862 /** 12863 * <p>Specifies the type of layer backing this view. The layer can be 12864 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12865 * {@link #LAYER_TYPE_HARDWARE}.</p> 12866 * 12867 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12868 * instance that controls how the layer is composed on screen. The following 12869 * properties of the paint are taken into account when composing the layer:</p> 12870 * <ul> 12871 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12872 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12873 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12874 * </ul> 12875 * 12876 * <p>If this view has an alpha value set to < 1.0 by calling 12877 * {@link #setAlpha(float)}, the alpha value of the layer's paint is superceded 12878 * by this view's alpha value.</p> 12879 * 12880 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE}, 12881 * {@link #LAYER_TYPE_SOFTWARE} and {@link #LAYER_TYPE_HARDWARE} 12882 * for more information on when and how to use layers.</p> 12883 * 12884 * @param layerType The type of layer to use with this view, must be one of 12885 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12886 * {@link #LAYER_TYPE_HARDWARE} 12887 * @param paint The paint used to compose the layer. This argument is optional 12888 * and can be null. It is ignored when the layer type is 12889 * {@link #LAYER_TYPE_NONE} 12890 * 12891 * @see #getLayerType() 12892 * @see #LAYER_TYPE_NONE 12893 * @see #LAYER_TYPE_SOFTWARE 12894 * @see #LAYER_TYPE_HARDWARE 12895 * @see #setAlpha(float) 12896 * 12897 * @attr ref android.R.styleable#View_layerType 12898 */ 12899 public void setLayerType(int layerType, Paint paint) { 12900 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 12901 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 12902 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 12903 } 12904 12905 if (layerType == mLayerType) { 12906 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 12907 mLayerPaint = paint == null ? new Paint() : paint; 12908 invalidateParentCaches(); 12909 invalidate(true); 12910 } 12911 return; 12912 } 12913 12914 // Destroy any previous software drawing cache if needed 12915 switch (mLayerType) { 12916 case LAYER_TYPE_HARDWARE: 12917 destroyLayer(false); 12918 // fall through - non-accelerated views may use software layer mechanism instead 12919 case LAYER_TYPE_SOFTWARE: 12920 destroyDrawingCache(); 12921 break; 12922 default: 12923 break; 12924 } 12925 12926 mLayerType = layerType; 12927 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 12928 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 12929 mLocalDirtyRect = layerDisabled ? null : new Rect(); 12930 12931 invalidateParentCaches(); 12932 invalidate(true); 12933 } 12934 12935 /** 12936 * Updates the {@link Paint} object used with the current layer (used only if the current 12937 * layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint 12938 * provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time 12939 * the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to 12940 * ensure that the view gets redrawn immediately. 12941 * 12942 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12943 * instance that controls how the layer is composed on screen. The following 12944 * properties of the paint are taken into account when composing the layer:</p> 12945 * <ul> 12946 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12947 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12948 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12949 * </ul> 12950 * 12951 * <p>If this view has an alpha value set to < 1.0 by calling {@link #setAlpha(float)}, the 12952 * alpha value of the layer's paint is superceded by this view's alpha value.</p> 12953 * 12954 * @param paint The paint used to compose the layer. This argument is optional 12955 * and can be null. It is ignored when the layer type is 12956 * {@link #LAYER_TYPE_NONE} 12957 * 12958 * @see #setLayerType(int, android.graphics.Paint) 12959 */ 12960 public void setLayerPaint(Paint paint) { 12961 int layerType = getLayerType(); 12962 if (layerType != LAYER_TYPE_NONE) { 12963 mLayerPaint = paint == null ? new Paint() : paint; 12964 if (layerType == LAYER_TYPE_HARDWARE) { 12965 HardwareLayer layer = getHardwareLayer(); 12966 if (layer != null) { 12967 layer.setLayerPaint(paint); 12968 } 12969 invalidateViewProperty(false, false); 12970 } else { 12971 invalidate(); 12972 } 12973 } 12974 } 12975 12976 /** 12977 * Indicates whether this view has a static layer. A view with layer type 12978 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 12979 * dynamic. 12980 */ 12981 boolean hasStaticLayer() { 12982 return true; 12983 } 12984 12985 /** 12986 * Indicates what type of layer is currently associated with this view. By default 12987 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 12988 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 12989 * for more information on the different types of layers. 12990 * 12991 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12992 * {@link #LAYER_TYPE_HARDWARE} 12993 * 12994 * @see #setLayerType(int, android.graphics.Paint) 12995 * @see #buildLayer() 12996 * @see #LAYER_TYPE_NONE 12997 * @see #LAYER_TYPE_SOFTWARE 12998 * @see #LAYER_TYPE_HARDWARE 12999 */ 13000 public int getLayerType() { 13001 return mLayerType; 13002 } 13003 13004 /** 13005 * Forces this view's layer to be created and this view to be rendered 13006 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 13007 * invoking this method will have no effect. 13008 * 13009 * This method can for instance be used to render a view into its layer before 13010 * starting an animation. If this view is complex, rendering into the layer 13011 * before starting the animation will avoid skipping frames. 13012 * 13013 * @throws IllegalStateException If this view is not attached to a window 13014 * 13015 * @see #setLayerType(int, android.graphics.Paint) 13016 */ 13017 public void buildLayer() { 13018 if (mLayerType == LAYER_TYPE_NONE) return; 13019 13020 final AttachInfo attachInfo = mAttachInfo; 13021 if (attachInfo == null) { 13022 throw new IllegalStateException("This view must be attached to a window first"); 13023 } 13024 13025 switch (mLayerType) { 13026 case LAYER_TYPE_HARDWARE: 13027 if (attachInfo.mHardwareRenderer != null && 13028 attachInfo.mHardwareRenderer.isEnabled() && 13029 attachInfo.mHardwareRenderer.validate()) { 13030 getHardwareLayer(); 13031 // TODO: We need a better way to handle this case 13032 // If views have registered pre-draw listeners they need 13033 // to be notified before we build the layer. Those listeners 13034 // may however rely on other events to happen first so we 13035 // cannot just invoke them here until they don't cancel the 13036 // current frame 13037 if (!attachInfo.mTreeObserver.hasOnPreDrawListeners()) { 13038 attachInfo.mViewRootImpl.dispatchFlushHardwareLayerUpdates(); 13039 } 13040 } 13041 break; 13042 case LAYER_TYPE_SOFTWARE: 13043 buildDrawingCache(true); 13044 break; 13045 } 13046 } 13047 13048 /** 13049 * <p>Returns a hardware layer that can be used to draw this view again 13050 * without executing its draw method.</p> 13051 * 13052 * @return A HardwareLayer ready to render, or null if an error occurred. 13053 */ 13054 HardwareLayer getHardwareLayer() { 13055 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 13056 !mAttachInfo.mHardwareRenderer.isEnabled()) { 13057 return null; 13058 } 13059 13060 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 13061 13062 final int width = mRight - mLeft; 13063 final int height = mBottom - mTop; 13064 13065 if (width == 0 || height == 0) { 13066 return null; 13067 } 13068 13069 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 13070 if (mHardwareLayer == null) { 13071 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 13072 width, height, isOpaque()); 13073 mLocalDirtyRect.set(0, 0, width, height); 13074 } else { 13075 if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 13076 if (mHardwareLayer.resize(width, height)) { 13077 mLocalDirtyRect.set(0, 0, width, height); 13078 } 13079 } 13080 13081 // This should not be necessary but applications that change 13082 // the parameters of their background drawable without calling 13083 // this.setBackground(Drawable) can leave the view in a bad state 13084 // (for instance isOpaque() returns true, but the background is 13085 // not opaque.) 13086 computeOpaqueFlags(); 13087 13088 final boolean opaque = isOpaque(); 13089 if (mHardwareLayer.isValid() && mHardwareLayer.isOpaque() != opaque) { 13090 mHardwareLayer.setOpaque(opaque); 13091 mLocalDirtyRect.set(0, 0, width, height); 13092 } 13093 } 13094 13095 // The layer is not valid if the underlying GPU resources cannot be allocated 13096 if (!mHardwareLayer.isValid()) { 13097 return null; 13098 } 13099 13100 mHardwareLayer.setLayerPaint(mLayerPaint); 13101 mHardwareLayer.redrawLater(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 13102 ViewRootImpl viewRoot = getViewRootImpl(); 13103 if (viewRoot != null) viewRoot.pushHardwareLayerUpdate(mHardwareLayer); 13104 13105 mLocalDirtyRect.setEmpty(); 13106 } 13107 13108 return mHardwareLayer; 13109 } 13110 13111 /** 13112 * Destroys this View's hardware layer if possible. 13113 * 13114 * @return True if the layer was destroyed, false otherwise. 13115 * 13116 * @see #setLayerType(int, android.graphics.Paint) 13117 * @see #LAYER_TYPE_HARDWARE 13118 */ 13119 boolean destroyLayer(boolean valid) { 13120 if (mHardwareLayer != null) { 13121 AttachInfo info = mAttachInfo; 13122 if (info != null && info.mHardwareRenderer != null && 13123 info.mHardwareRenderer.isEnabled() && 13124 (valid || info.mHardwareRenderer.validate())) { 13125 13126 info.mHardwareRenderer.cancelLayerUpdate(mHardwareLayer); 13127 mHardwareLayer.destroy(); 13128 mHardwareLayer = null; 13129 13130 invalidate(true); 13131 invalidateParentCaches(); 13132 } 13133 return true; 13134 } 13135 return false; 13136 } 13137 13138 /** 13139 * Destroys all hardware rendering resources. This method is invoked 13140 * when the system needs to reclaim resources. Upon execution of this 13141 * method, you should free any OpenGL resources created by the view. 13142 * 13143 * Note: you <strong>must</strong> call 13144 * <code>super.destroyHardwareResources()</code> when overriding 13145 * this method. 13146 * 13147 * @hide 13148 */ 13149 protected void destroyHardwareResources() { 13150 resetDisplayList(); 13151 destroyLayer(true); 13152 } 13153 13154 /** 13155 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 13156 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 13157 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 13158 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 13159 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 13160 * null.</p> 13161 * 13162 * <p>Enabling the drawing cache is similar to 13163 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 13164 * acceleration is turned off. When hardware acceleration is turned on, enabling the 13165 * drawing cache has no effect on rendering because the system uses a different mechanism 13166 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 13167 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 13168 * for information on how to enable software and hardware layers.</p> 13169 * 13170 * <p>This API can be used to manually generate 13171 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 13172 * {@link #getDrawingCache()}.</p> 13173 * 13174 * @param enabled true to enable the drawing cache, false otherwise 13175 * 13176 * @see #isDrawingCacheEnabled() 13177 * @see #getDrawingCache() 13178 * @see #buildDrawingCache() 13179 * @see #setLayerType(int, android.graphics.Paint) 13180 */ 13181 public void setDrawingCacheEnabled(boolean enabled) { 13182 mCachingFailed = false; 13183 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 13184 } 13185 13186 /** 13187 * <p>Indicates whether the drawing cache is enabled for this view.</p> 13188 * 13189 * @return true if the drawing cache is enabled 13190 * 13191 * @see #setDrawingCacheEnabled(boolean) 13192 * @see #getDrawingCache() 13193 */ 13194 @ViewDebug.ExportedProperty(category = "drawing") 13195 public boolean isDrawingCacheEnabled() { 13196 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 13197 } 13198 13199 /** 13200 * Debugging utility which recursively outputs the dirty state of a view and its 13201 * descendants. 13202 * 13203 * @hide 13204 */ 13205 @SuppressWarnings({"UnusedDeclaration"}) 13206 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 13207 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.PFLAG_DIRTY_MASK) + 13208 ") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID(" + 13209 (mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID) + 13210 ") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")"); 13211 if (clear) { 13212 mPrivateFlags &= clearMask; 13213 } 13214 if (this instanceof ViewGroup) { 13215 ViewGroup parent = (ViewGroup) this; 13216 final int count = parent.getChildCount(); 13217 for (int i = 0; i < count; i++) { 13218 final View child = parent.getChildAt(i); 13219 child.outputDirtyFlags(indent + " ", clear, clearMask); 13220 } 13221 } 13222 } 13223 13224 /** 13225 * This method is used by ViewGroup to cause its children to restore or recreate their 13226 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 13227 * to recreate its own display list, which would happen if it went through the normal 13228 * draw/dispatchDraw mechanisms. 13229 * 13230 * @hide 13231 */ 13232 protected void dispatchGetDisplayList() {} 13233 13234 /** 13235 * A view that is not attached or hardware accelerated cannot create a display list. 13236 * This method checks these conditions and returns the appropriate result. 13237 * 13238 * @return true if view has the ability to create a display list, false otherwise. 13239 * 13240 * @hide 13241 */ 13242 public boolean canHaveDisplayList() { 13243 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 13244 } 13245 13246 /** 13247 * @return The {@link HardwareRenderer} associated with that view or null if 13248 * hardware rendering is not supported or this view is not attached 13249 * to a window. 13250 * 13251 * @hide 13252 */ 13253 public HardwareRenderer getHardwareRenderer() { 13254 if (mAttachInfo != null) { 13255 return mAttachInfo.mHardwareRenderer; 13256 } 13257 return null; 13258 } 13259 13260 /** 13261 * Returns a DisplayList. If the incoming displayList is null, one will be created. 13262 * Otherwise, the same display list will be returned (after having been rendered into 13263 * along the way, depending on the invalidation state of the view). 13264 * 13265 * @param displayList The previous version of this displayList, could be null. 13266 * @param isLayer Whether the requester of the display list is a layer. If so, 13267 * the view will avoid creating a layer inside the resulting display list. 13268 * @return A new or reused DisplayList object. 13269 */ 13270 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 13271 if (!canHaveDisplayList()) { 13272 return null; 13273 } 13274 13275 if (((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || 13276 displayList == null || !displayList.isValid() || 13277 (!isLayer && mRecreateDisplayList))) { 13278 // Don't need to recreate the display list, just need to tell our 13279 // children to restore/recreate theirs 13280 if (displayList != null && displayList.isValid() && 13281 !isLayer && !mRecreateDisplayList) { 13282 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 13283 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13284 dispatchGetDisplayList(); 13285 13286 return displayList; 13287 } 13288 13289 if (!isLayer) { 13290 // If we got here, we're recreating it. Mark it as such to ensure that 13291 // we copy in child display lists into ours in drawChild() 13292 mRecreateDisplayList = true; 13293 } 13294 if (displayList == null) { 13295 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(getClass().getName()); 13296 // If we're creating a new display list, make sure our parent gets invalidated 13297 // since they will need to recreate their display list to account for this 13298 // new child display list. 13299 invalidateParentCaches(); 13300 } 13301 13302 boolean caching = false; 13303 int width = mRight - mLeft; 13304 int height = mBottom - mTop; 13305 int layerType = getLayerType(); 13306 13307 final HardwareCanvas canvas = displayList.start(width, height); 13308 13309 try { 13310 if (!isLayer && layerType != LAYER_TYPE_NONE) { 13311 if (layerType == LAYER_TYPE_HARDWARE) { 13312 final HardwareLayer layer = getHardwareLayer(); 13313 if (layer != null && layer.isValid()) { 13314 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 13315 } else { 13316 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 13317 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 13318 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13319 } 13320 caching = true; 13321 } else { 13322 buildDrawingCache(true); 13323 Bitmap cache = getDrawingCache(true); 13324 if (cache != null) { 13325 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 13326 caching = true; 13327 } 13328 } 13329 } else { 13330 13331 computeScroll(); 13332 13333 canvas.translate(-mScrollX, -mScrollY); 13334 if (!isLayer) { 13335 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 13336 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13337 } 13338 13339 // Fast path for layouts with no backgrounds 13340 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13341 dispatchDraw(canvas); 13342 if (mOverlay != null && !mOverlay.isEmpty()) { 13343 mOverlay.getOverlayView().draw(canvas); 13344 } 13345 } else { 13346 draw(canvas); 13347 } 13348 } 13349 } finally { 13350 displayList.end(); 13351 displayList.setCaching(caching); 13352 if (isLayer) { 13353 displayList.setLeftTopRightBottom(0, 0, width, height); 13354 } else { 13355 setDisplayListProperties(displayList); 13356 } 13357 } 13358 } else if (!isLayer) { 13359 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 13360 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13361 } 13362 13363 return displayList; 13364 } 13365 13366 /** 13367 * Get the DisplayList for the HardwareLayer 13368 * 13369 * @param layer The HardwareLayer whose DisplayList we want 13370 * @return A DisplayList fopr the specified HardwareLayer 13371 */ 13372 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 13373 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 13374 layer.setDisplayList(displayList); 13375 return displayList; 13376 } 13377 13378 13379 /** 13380 * <p>Returns a display list that can be used to draw this view again 13381 * without executing its draw method.</p> 13382 * 13383 * @return A DisplayList ready to replay, or null if caching is not enabled. 13384 * 13385 * @hide 13386 */ 13387 public DisplayList getDisplayList() { 13388 mDisplayList = getDisplayList(mDisplayList, false); 13389 return mDisplayList; 13390 } 13391 13392 private void clearDisplayList() { 13393 if (mDisplayList != null) { 13394 mDisplayList.clear(); 13395 } 13396 } 13397 13398 private void resetDisplayList() { 13399 if (mDisplayList != null) { 13400 mDisplayList.reset(); 13401 } 13402 } 13403 13404 /** 13405 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 13406 * 13407 * @return A non-scaled bitmap representing this view or null if cache is disabled. 13408 * 13409 * @see #getDrawingCache(boolean) 13410 */ 13411 public Bitmap getDrawingCache() { 13412 return getDrawingCache(false); 13413 } 13414 13415 /** 13416 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 13417 * is null when caching is disabled. If caching is enabled and the cache is not ready, 13418 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 13419 * draw from the cache when the cache is enabled. To benefit from the cache, you must 13420 * request the drawing cache by calling this method and draw it on screen if the 13421 * returned bitmap is not null.</p> 13422 * 13423 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 13424 * this method will create a bitmap of the same size as this view. Because this bitmap 13425 * will be drawn scaled by the parent ViewGroup, the result on screen might show 13426 * scaling artifacts. To avoid such artifacts, you should call this method by setting 13427 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 13428 * size than the view. This implies that your application must be able to handle this 13429 * size.</p> 13430 * 13431 * @param autoScale Indicates whether the generated bitmap should be scaled based on 13432 * the current density of the screen when the application is in compatibility 13433 * mode. 13434 * 13435 * @return A bitmap representing this view or null if cache is disabled. 13436 * 13437 * @see #setDrawingCacheEnabled(boolean) 13438 * @see #isDrawingCacheEnabled() 13439 * @see #buildDrawingCache(boolean) 13440 * @see #destroyDrawingCache() 13441 */ 13442 public Bitmap getDrawingCache(boolean autoScale) { 13443 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 13444 return null; 13445 } 13446 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 13447 buildDrawingCache(autoScale); 13448 } 13449 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 13450 } 13451 13452 /** 13453 * <p>Frees the resources used by the drawing cache. If you call 13454 * {@link #buildDrawingCache()} manually without calling 13455 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 13456 * should cleanup the cache with this method afterwards.</p> 13457 * 13458 * @see #setDrawingCacheEnabled(boolean) 13459 * @see #buildDrawingCache() 13460 * @see #getDrawingCache() 13461 */ 13462 public void destroyDrawingCache() { 13463 if (mDrawingCache != null) { 13464 mDrawingCache.recycle(); 13465 mDrawingCache = null; 13466 } 13467 if (mUnscaledDrawingCache != null) { 13468 mUnscaledDrawingCache.recycle(); 13469 mUnscaledDrawingCache = null; 13470 } 13471 } 13472 13473 /** 13474 * Setting a solid background color for the drawing cache's bitmaps will improve 13475 * performance and memory usage. Note, though that this should only be used if this 13476 * view will always be drawn on top of a solid color. 13477 * 13478 * @param color The background color to use for the drawing cache's bitmap 13479 * 13480 * @see #setDrawingCacheEnabled(boolean) 13481 * @see #buildDrawingCache() 13482 * @see #getDrawingCache() 13483 */ 13484 public void setDrawingCacheBackgroundColor(int color) { 13485 if (color != mDrawingCacheBackgroundColor) { 13486 mDrawingCacheBackgroundColor = color; 13487 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 13488 } 13489 } 13490 13491 /** 13492 * @see #setDrawingCacheBackgroundColor(int) 13493 * 13494 * @return The background color to used for the drawing cache's bitmap 13495 */ 13496 public int getDrawingCacheBackgroundColor() { 13497 return mDrawingCacheBackgroundColor; 13498 } 13499 13500 /** 13501 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 13502 * 13503 * @see #buildDrawingCache(boolean) 13504 */ 13505 public void buildDrawingCache() { 13506 buildDrawingCache(false); 13507 } 13508 13509 /** 13510 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 13511 * 13512 * <p>If you call {@link #buildDrawingCache()} manually without calling 13513 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 13514 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 13515 * 13516 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 13517 * this method will create a bitmap of the same size as this view. Because this bitmap 13518 * will be drawn scaled by the parent ViewGroup, the result on screen might show 13519 * scaling artifacts. To avoid such artifacts, you should call this method by setting 13520 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 13521 * size than the view. This implies that your application must be able to handle this 13522 * size.</p> 13523 * 13524 * <p>You should avoid calling this method when hardware acceleration is enabled. If 13525 * you do not need the drawing cache bitmap, calling this method will increase memory 13526 * usage and cause the view to be rendered in software once, thus negatively impacting 13527 * performance.</p> 13528 * 13529 * @see #getDrawingCache() 13530 * @see #destroyDrawingCache() 13531 */ 13532 public void buildDrawingCache(boolean autoScale) { 13533 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ? 13534 mDrawingCache == null : mUnscaledDrawingCache == null)) { 13535 mCachingFailed = false; 13536 13537 int width = mRight - mLeft; 13538 int height = mBottom - mTop; 13539 13540 final AttachInfo attachInfo = mAttachInfo; 13541 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 13542 13543 if (autoScale && scalingRequired) { 13544 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 13545 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 13546 } 13547 13548 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 13549 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 13550 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 13551 13552 final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4); 13553 final long drawingCacheSize = 13554 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize(); 13555 if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) { 13556 if (width > 0 && height > 0) { 13557 Log.w(VIEW_LOG_TAG, "View too large to fit into drawing cache, needs " 13558 + projectedBitmapSize + " bytes, only " 13559 + drawingCacheSize + " available"); 13560 } 13561 destroyDrawingCache(); 13562 mCachingFailed = true; 13563 return; 13564 } 13565 13566 boolean clear = true; 13567 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 13568 13569 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 13570 Bitmap.Config quality; 13571 if (!opaque) { 13572 // Never pick ARGB_4444 because it looks awful 13573 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 13574 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 13575 case DRAWING_CACHE_QUALITY_AUTO: 13576 case DRAWING_CACHE_QUALITY_LOW: 13577 case DRAWING_CACHE_QUALITY_HIGH: 13578 default: 13579 quality = Bitmap.Config.ARGB_8888; 13580 break; 13581 } 13582 } else { 13583 // Optimization for translucent windows 13584 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 13585 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 13586 } 13587 13588 // Try to cleanup memory 13589 if (bitmap != null) bitmap.recycle(); 13590 13591 try { 13592 bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13593 width, height, quality); 13594 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 13595 if (autoScale) { 13596 mDrawingCache = bitmap; 13597 } else { 13598 mUnscaledDrawingCache = bitmap; 13599 } 13600 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 13601 } catch (OutOfMemoryError e) { 13602 // If there is not enough memory to create the bitmap cache, just 13603 // ignore the issue as bitmap caches are not required to draw the 13604 // view hierarchy 13605 if (autoScale) { 13606 mDrawingCache = null; 13607 } else { 13608 mUnscaledDrawingCache = null; 13609 } 13610 mCachingFailed = true; 13611 return; 13612 } 13613 13614 clear = drawingCacheBackgroundColor != 0; 13615 } 13616 13617 Canvas canvas; 13618 if (attachInfo != null) { 13619 canvas = attachInfo.mCanvas; 13620 if (canvas == null) { 13621 canvas = new Canvas(); 13622 } 13623 canvas.setBitmap(bitmap); 13624 // Temporarily clobber the cached Canvas in case one of our children 13625 // is also using a drawing cache. Without this, the children would 13626 // steal the canvas by attaching their own bitmap to it and bad, bad 13627 // thing would happen (invisible views, corrupted drawings, etc.) 13628 attachInfo.mCanvas = null; 13629 } else { 13630 // This case should hopefully never or seldom happen 13631 canvas = new Canvas(bitmap); 13632 } 13633 13634 if (clear) { 13635 bitmap.eraseColor(drawingCacheBackgroundColor); 13636 } 13637 13638 computeScroll(); 13639 final int restoreCount = canvas.save(); 13640 13641 if (autoScale && scalingRequired) { 13642 final float scale = attachInfo.mApplicationScale; 13643 canvas.scale(scale, scale); 13644 } 13645 13646 canvas.translate(-mScrollX, -mScrollY); 13647 13648 mPrivateFlags |= PFLAG_DRAWN; 13649 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 13650 mLayerType != LAYER_TYPE_NONE) { 13651 mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID; 13652 } 13653 13654 // Fast path for layouts with no backgrounds 13655 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13656 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13657 dispatchDraw(canvas); 13658 if (mOverlay != null && !mOverlay.isEmpty()) { 13659 mOverlay.getOverlayView().draw(canvas); 13660 } 13661 } else { 13662 draw(canvas); 13663 } 13664 13665 canvas.restoreToCount(restoreCount); 13666 canvas.setBitmap(null); 13667 13668 if (attachInfo != null) { 13669 // Restore the cached Canvas for our siblings 13670 attachInfo.mCanvas = canvas; 13671 } 13672 } 13673 } 13674 13675 /** 13676 * Create a snapshot of the view into a bitmap. We should probably make 13677 * some form of this public, but should think about the API. 13678 */ 13679 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 13680 int width = mRight - mLeft; 13681 int height = mBottom - mTop; 13682 13683 final AttachInfo attachInfo = mAttachInfo; 13684 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 13685 width = (int) ((width * scale) + 0.5f); 13686 height = (int) ((height * scale) + 0.5f); 13687 13688 Bitmap bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13689 width > 0 ? width : 1, height > 0 ? height : 1, quality); 13690 if (bitmap == null) { 13691 throw new OutOfMemoryError(); 13692 } 13693 13694 Resources resources = getResources(); 13695 if (resources != null) { 13696 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 13697 } 13698 13699 Canvas canvas; 13700 if (attachInfo != null) { 13701 canvas = attachInfo.mCanvas; 13702 if (canvas == null) { 13703 canvas = new Canvas(); 13704 } 13705 canvas.setBitmap(bitmap); 13706 // Temporarily clobber the cached Canvas in case one of our children 13707 // is also using a drawing cache. Without this, the children would 13708 // steal the canvas by attaching their own bitmap to it and bad, bad 13709 // things would happen (invisible views, corrupted drawings, etc.) 13710 attachInfo.mCanvas = null; 13711 } else { 13712 // This case should hopefully never or seldom happen 13713 canvas = new Canvas(bitmap); 13714 } 13715 13716 if ((backgroundColor & 0xff000000) != 0) { 13717 bitmap.eraseColor(backgroundColor); 13718 } 13719 13720 computeScroll(); 13721 final int restoreCount = canvas.save(); 13722 canvas.scale(scale, scale); 13723 canvas.translate(-mScrollX, -mScrollY); 13724 13725 // Temporarily remove the dirty mask 13726 int flags = mPrivateFlags; 13727 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13728 13729 // Fast path for layouts with no backgrounds 13730 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13731 dispatchDraw(canvas); 13732 if (mOverlay != null && !mOverlay.isEmpty()) { 13733 mOverlay.getOverlayView().draw(canvas); 13734 } 13735 } else { 13736 draw(canvas); 13737 } 13738 13739 mPrivateFlags = flags; 13740 13741 canvas.restoreToCount(restoreCount); 13742 canvas.setBitmap(null); 13743 13744 if (attachInfo != null) { 13745 // Restore the cached Canvas for our siblings 13746 attachInfo.mCanvas = canvas; 13747 } 13748 13749 return bitmap; 13750 } 13751 13752 /** 13753 * Indicates whether this View is currently in edit mode. A View is usually 13754 * in edit mode when displayed within a developer tool. For instance, if 13755 * this View is being drawn by a visual user interface builder, this method 13756 * should return true. 13757 * 13758 * Subclasses should check the return value of this method to provide 13759 * different behaviors if their normal behavior might interfere with the 13760 * host environment. For instance: the class spawns a thread in its 13761 * constructor, the drawing code relies on device-specific features, etc. 13762 * 13763 * This method is usually checked in the drawing code of custom widgets. 13764 * 13765 * @return True if this View is in edit mode, false otherwise. 13766 */ 13767 public boolean isInEditMode() { 13768 return false; 13769 } 13770 13771 /** 13772 * If the View draws content inside its padding and enables fading edges, 13773 * it needs to support padding offsets. Padding offsets are added to the 13774 * fading edges to extend the length of the fade so that it covers pixels 13775 * drawn inside the padding. 13776 * 13777 * Subclasses of this class should override this method if they need 13778 * to draw content inside the padding. 13779 * 13780 * @return True if padding offset must be applied, false otherwise. 13781 * 13782 * @see #getLeftPaddingOffset() 13783 * @see #getRightPaddingOffset() 13784 * @see #getTopPaddingOffset() 13785 * @see #getBottomPaddingOffset() 13786 * 13787 * @since CURRENT 13788 */ 13789 protected boolean isPaddingOffsetRequired() { 13790 return false; 13791 } 13792 13793 /** 13794 * Amount by which to extend the left fading region. Called only when 13795 * {@link #isPaddingOffsetRequired()} returns true. 13796 * 13797 * @return The left padding offset in pixels. 13798 * 13799 * @see #isPaddingOffsetRequired() 13800 * 13801 * @since CURRENT 13802 */ 13803 protected int getLeftPaddingOffset() { 13804 return 0; 13805 } 13806 13807 /** 13808 * Amount by which to extend the right fading region. Called only when 13809 * {@link #isPaddingOffsetRequired()} returns true. 13810 * 13811 * @return The right padding offset in pixels. 13812 * 13813 * @see #isPaddingOffsetRequired() 13814 * 13815 * @since CURRENT 13816 */ 13817 protected int getRightPaddingOffset() { 13818 return 0; 13819 } 13820 13821 /** 13822 * Amount by which to extend the top fading region. Called only when 13823 * {@link #isPaddingOffsetRequired()} returns true. 13824 * 13825 * @return The top padding offset in pixels. 13826 * 13827 * @see #isPaddingOffsetRequired() 13828 * 13829 * @since CURRENT 13830 */ 13831 protected int getTopPaddingOffset() { 13832 return 0; 13833 } 13834 13835 /** 13836 * Amount by which to extend the bottom fading region. Called only when 13837 * {@link #isPaddingOffsetRequired()} returns true. 13838 * 13839 * @return The bottom padding offset in pixels. 13840 * 13841 * @see #isPaddingOffsetRequired() 13842 * 13843 * @since CURRENT 13844 */ 13845 protected int getBottomPaddingOffset() { 13846 return 0; 13847 } 13848 13849 /** 13850 * @hide 13851 * @param offsetRequired 13852 */ 13853 protected int getFadeTop(boolean offsetRequired) { 13854 int top = mPaddingTop; 13855 if (offsetRequired) top += getTopPaddingOffset(); 13856 return top; 13857 } 13858 13859 /** 13860 * @hide 13861 * @param offsetRequired 13862 */ 13863 protected int getFadeHeight(boolean offsetRequired) { 13864 int padding = mPaddingTop; 13865 if (offsetRequired) padding += getTopPaddingOffset(); 13866 return mBottom - mTop - mPaddingBottom - padding; 13867 } 13868 13869 /** 13870 * <p>Indicates whether this view is attached to a hardware accelerated 13871 * window or not.</p> 13872 * 13873 * <p>Even if this method returns true, it does not mean that every call 13874 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 13875 * accelerated {@link android.graphics.Canvas}. For instance, if this view 13876 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 13877 * window is hardware accelerated, 13878 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 13879 * return false, and this method will return true.</p> 13880 * 13881 * @return True if the view is attached to a window and the window is 13882 * hardware accelerated; false in any other case. 13883 */ 13884 public boolean isHardwareAccelerated() { 13885 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13886 } 13887 13888 /** 13889 * Sets a rectangular area on this view to which the view will be clipped 13890 * when it is drawn. Setting the value to null will remove the clip bounds 13891 * and the view will draw normally, using its full bounds. 13892 * 13893 * @param clipBounds The rectangular area, in the local coordinates of 13894 * this view, to which future drawing operations will be clipped. 13895 */ 13896 public void setClipBounds(Rect clipBounds) { 13897 if (clipBounds != null) { 13898 if (clipBounds.equals(mClipBounds)) { 13899 return; 13900 } 13901 if (mClipBounds == null) { 13902 invalidate(); 13903 mClipBounds = new Rect(clipBounds); 13904 } else { 13905 invalidate(Math.min(mClipBounds.left, clipBounds.left), 13906 Math.min(mClipBounds.top, clipBounds.top), 13907 Math.max(mClipBounds.right, clipBounds.right), 13908 Math.max(mClipBounds.bottom, clipBounds.bottom)); 13909 mClipBounds.set(clipBounds); 13910 } 13911 } else { 13912 if (mClipBounds != null) { 13913 invalidate(); 13914 mClipBounds = null; 13915 } 13916 } 13917 } 13918 13919 /** 13920 * Returns a copy of the current {@link #setClipBounds(Rect) clipBounds}. 13921 * 13922 * @return A copy of the current clip bounds if clip bounds are set, 13923 * otherwise null. 13924 */ 13925 public Rect getClipBounds() { 13926 return (mClipBounds != null) ? new Rect(mClipBounds) : null; 13927 } 13928 13929 /** 13930 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 13931 * case of an active Animation being run on the view. 13932 */ 13933 private boolean drawAnimation(ViewGroup parent, long drawingTime, 13934 Animation a, boolean scalingRequired) { 13935 Transformation invalidationTransform; 13936 final int flags = parent.mGroupFlags; 13937 final boolean initialized = a.isInitialized(); 13938 if (!initialized) { 13939 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 13940 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 13941 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 13942 onAnimationStart(); 13943 } 13944 13945 final Transformation t = parent.getChildTransformation(); 13946 boolean more = a.getTransformation(drawingTime, t, 1f); 13947 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 13948 if (parent.mInvalidationTransformation == null) { 13949 parent.mInvalidationTransformation = new Transformation(); 13950 } 13951 invalidationTransform = parent.mInvalidationTransformation; 13952 a.getTransformation(drawingTime, invalidationTransform, 1f); 13953 } else { 13954 invalidationTransform = t; 13955 } 13956 13957 if (more) { 13958 if (!a.willChangeBounds()) { 13959 if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) == 13960 ViewGroup.FLAG_OPTIMIZE_INVALIDATE) { 13961 parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED; 13962 } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) { 13963 // The child need to draw an animation, potentially offscreen, so 13964 // make sure we do not cancel invalidate requests 13965 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13966 parent.invalidate(mLeft, mTop, mRight, mBottom); 13967 } 13968 } else { 13969 if (parent.mInvalidateRegion == null) { 13970 parent.mInvalidateRegion = new RectF(); 13971 } 13972 final RectF region = parent.mInvalidateRegion; 13973 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 13974 invalidationTransform); 13975 13976 // The child need to draw an animation, potentially offscreen, so 13977 // make sure we do not cancel invalidate requests 13978 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13979 13980 final int left = mLeft + (int) region.left; 13981 final int top = mTop + (int) region.top; 13982 parent.invalidate(left, top, left + (int) (region.width() + .5f), 13983 top + (int) (region.height() + .5f)); 13984 } 13985 } 13986 return more; 13987 } 13988 13989 /** 13990 * This method is called by getDisplayList() when a display list is created or re-rendered. 13991 * It sets or resets the current value of all properties on that display list (resetting is 13992 * necessary when a display list is being re-created, because we need to make sure that 13993 * previously-set transform values 13994 */ 13995 void setDisplayListProperties(DisplayList displayList) { 13996 if (displayList != null) { 13997 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13998 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 13999 if (mParent instanceof ViewGroup) { 14000 displayList.setClipToBounds( 14001 (((ViewGroup) mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 14002 } 14003 float alpha = 1; 14004 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 14005 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 14006 ViewGroup parentVG = (ViewGroup) mParent; 14007 final Transformation t = parentVG.getChildTransformation(); 14008 if (parentVG.getChildStaticTransformation(this, t)) { 14009 final int transformType = t.getTransformationType(); 14010 if (transformType != Transformation.TYPE_IDENTITY) { 14011 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 14012 alpha = t.getAlpha(); 14013 } 14014 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 14015 displayList.setMatrix(t.getMatrix()); 14016 } 14017 } 14018 } 14019 } 14020 if (mTransformationInfo != null) { 14021 alpha *= getFinalAlpha(); 14022 if (alpha < 1) { 14023 final int multipliedAlpha = (int) (255 * alpha); 14024 if (onSetAlpha(multipliedAlpha)) { 14025 alpha = 1; 14026 } 14027 } 14028 displayList.setTransformationInfo(alpha, 14029 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 14030 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 14031 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 14032 mTransformationInfo.mScaleY); 14033 if (mTransformationInfo.mCamera == null) { 14034 mTransformationInfo.mCamera = new Camera(); 14035 mTransformationInfo.matrix3D = new Matrix(); 14036 } 14037 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 14038 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == PFLAG_PIVOT_EXPLICITLY_SET) { 14039 displayList.setPivotX(getPivotX()); 14040 displayList.setPivotY(getPivotY()); 14041 } 14042 } else if (alpha < 1) { 14043 displayList.setAlpha(alpha); 14044 } 14045 } 14046 } 14047 14048 /** 14049 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 14050 * This draw() method is an implementation detail and is not intended to be overridden or 14051 * to be called from anywhere else other than ViewGroup.drawChild(). 14052 */ 14053 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 14054 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 14055 boolean more = false; 14056 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 14057 final int flags = parent.mGroupFlags; 14058 14059 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 14060 parent.getChildTransformation().clear(); 14061 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 14062 } 14063 14064 Transformation transformToApply = null; 14065 boolean concatMatrix = false; 14066 14067 boolean scalingRequired = false; 14068 boolean caching; 14069 int layerType = getLayerType(); 14070 14071 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 14072 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 14073 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 14074 caching = true; 14075 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 14076 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 14077 } else { 14078 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 14079 } 14080 14081 final Animation a = getAnimation(); 14082 if (a != null) { 14083 more = drawAnimation(parent, drawingTime, a, scalingRequired); 14084 concatMatrix = a.willChangeTransformationMatrix(); 14085 if (concatMatrix) { 14086 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 14087 } 14088 transformToApply = parent.getChildTransformation(); 14089 } else { 14090 if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) == 14091 PFLAG3_VIEW_IS_ANIMATING_TRANSFORM && mDisplayList != null) { 14092 // No longer animating: clear out old animation matrix 14093 mDisplayList.setAnimationMatrix(null); 14094 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 14095 } 14096 if (!useDisplayListProperties && 14097 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 14098 final Transformation t = parent.getChildTransformation(); 14099 final boolean hasTransform = parent.getChildStaticTransformation(this, t); 14100 if (hasTransform) { 14101 final int transformType = t.getTransformationType(); 14102 transformToApply = transformType != Transformation.TYPE_IDENTITY ? t : null; 14103 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 14104 } 14105 } 14106 } 14107 14108 concatMatrix |= !childHasIdentityMatrix; 14109 14110 // Sets the flag as early as possible to allow draw() implementations 14111 // to call invalidate() successfully when doing animations 14112 mPrivateFlags |= PFLAG_DRAWN; 14113 14114 if (!concatMatrix && 14115 (flags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS | 14116 ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN && 14117 canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 14118 (mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) { 14119 mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED; 14120 return more; 14121 } 14122 mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED; 14123 14124 if (hardwareAccelerated) { 14125 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 14126 // retain the flag's value temporarily in the mRecreateDisplayList flag 14127 mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED; 14128 mPrivateFlags &= ~PFLAG_INVALIDATED; 14129 } 14130 14131 DisplayList displayList = null; 14132 Bitmap cache = null; 14133 boolean hasDisplayList = false; 14134 if (caching) { 14135 if (!hardwareAccelerated) { 14136 if (layerType != LAYER_TYPE_NONE) { 14137 layerType = LAYER_TYPE_SOFTWARE; 14138 buildDrawingCache(true); 14139 } 14140 cache = getDrawingCache(true); 14141 } else { 14142 switch (layerType) { 14143 case LAYER_TYPE_SOFTWARE: 14144 if (useDisplayListProperties) { 14145 hasDisplayList = canHaveDisplayList(); 14146 } else { 14147 buildDrawingCache(true); 14148 cache = getDrawingCache(true); 14149 } 14150 break; 14151 case LAYER_TYPE_HARDWARE: 14152 if (useDisplayListProperties) { 14153 hasDisplayList = canHaveDisplayList(); 14154 } 14155 break; 14156 case LAYER_TYPE_NONE: 14157 // Delay getting the display list until animation-driven alpha values are 14158 // set up and possibly passed on to the view 14159 hasDisplayList = canHaveDisplayList(); 14160 break; 14161 } 14162 } 14163 } 14164 useDisplayListProperties &= hasDisplayList; 14165 if (useDisplayListProperties) { 14166 displayList = getDisplayList(); 14167 if (!displayList.isValid()) { 14168 // Uncommon, but possible. If a view is removed from the hierarchy during the call 14169 // to getDisplayList(), the display list will be marked invalid and we should not 14170 // try to use it again. 14171 displayList = null; 14172 hasDisplayList = false; 14173 useDisplayListProperties = false; 14174 } 14175 } 14176 14177 int sx = 0; 14178 int sy = 0; 14179 if (!hasDisplayList) { 14180 computeScroll(); 14181 sx = mScrollX; 14182 sy = mScrollY; 14183 } 14184 14185 final boolean hasNoCache = cache == null || hasDisplayList; 14186 final boolean offsetForScroll = cache == null && !hasDisplayList && 14187 layerType != LAYER_TYPE_HARDWARE; 14188 14189 int restoreTo = -1; 14190 if (!useDisplayListProperties || transformToApply != null) { 14191 restoreTo = canvas.save(); 14192 } 14193 if (offsetForScroll) { 14194 canvas.translate(mLeft - sx, mTop - sy); 14195 } else { 14196 if (!useDisplayListProperties) { 14197 canvas.translate(mLeft, mTop); 14198 } 14199 if (scalingRequired) { 14200 if (useDisplayListProperties) { 14201 // TODO: Might not need this if we put everything inside the DL 14202 restoreTo = canvas.save(); 14203 } 14204 // mAttachInfo cannot be null, otherwise scalingRequired == false 14205 final float scale = 1.0f / mAttachInfo.mApplicationScale; 14206 canvas.scale(scale, scale); 14207 } 14208 } 14209 14210 float alpha = useDisplayListProperties ? 1 : (getAlpha() * getTransitionAlpha()); 14211 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || 14212 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 14213 if (transformToApply != null || !childHasIdentityMatrix) { 14214 int transX = 0; 14215 int transY = 0; 14216 14217 if (offsetForScroll) { 14218 transX = -sx; 14219 transY = -sy; 14220 } 14221 14222 if (transformToApply != null) { 14223 if (concatMatrix) { 14224 if (useDisplayListProperties) { 14225 displayList.setAnimationMatrix(transformToApply.getMatrix()); 14226 } else { 14227 // Undo the scroll translation, apply the transformation matrix, 14228 // then redo the scroll translate to get the correct result. 14229 canvas.translate(-transX, -transY); 14230 canvas.concat(transformToApply.getMatrix()); 14231 canvas.translate(transX, transY); 14232 } 14233 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 14234 } 14235 14236 float transformAlpha = transformToApply.getAlpha(); 14237 if (transformAlpha < 1) { 14238 alpha *= transformAlpha; 14239 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 14240 } 14241 } 14242 14243 if (!childHasIdentityMatrix && !useDisplayListProperties) { 14244 canvas.translate(-transX, -transY); 14245 canvas.concat(getMatrix()); 14246 canvas.translate(transX, transY); 14247 } 14248 } 14249 14250 // Deal with alpha if it is or used to be <1 14251 if (alpha < 1 || 14252 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 14253 if (alpha < 1) { 14254 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA; 14255 } else { 14256 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA; 14257 } 14258 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 14259 if (hasNoCache) { 14260 final int multipliedAlpha = (int) (255 * alpha); 14261 if (!onSetAlpha(multipliedAlpha)) { 14262 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 14263 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 14264 layerType != LAYER_TYPE_NONE) { 14265 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 14266 } 14267 if (useDisplayListProperties) { 14268 displayList.setAlpha(alpha * getAlpha() * getTransitionAlpha()); 14269 } else if (layerType == LAYER_TYPE_NONE) { 14270 final int scrollX = hasDisplayList ? 0 : sx; 14271 final int scrollY = hasDisplayList ? 0 : sy; 14272 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 14273 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 14274 } 14275 } else { 14276 // Alpha is handled by the child directly, clobber the layer's alpha 14277 mPrivateFlags |= PFLAG_ALPHA_SET; 14278 } 14279 } 14280 } 14281 } else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 14282 onSetAlpha(255); 14283 mPrivateFlags &= ~PFLAG_ALPHA_SET; 14284 } 14285 14286 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 14287 !useDisplayListProperties && cache == null) { 14288 if (offsetForScroll) { 14289 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 14290 } else { 14291 if (!scalingRequired || cache == null) { 14292 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 14293 } else { 14294 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 14295 } 14296 } 14297 } 14298 14299 if (!useDisplayListProperties && hasDisplayList) { 14300 displayList = getDisplayList(); 14301 if (!displayList.isValid()) { 14302 // Uncommon, but possible. If a view is removed from the hierarchy during the call 14303 // to getDisplayList(), the display list will be marked invalid and we should not 14304 // try to use it again. 14305 displayList = null; 14306 hasDisplayList = false; 14307 } 14308 } 14309 14310 if (hasNoCache) { 14311 boolean layerRendered = false; 14312 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 14313 final HardwareLayer layer = getHardwareLayer(); 14314 if (layer != null && layer.isValid()) { 14315 mLayerPaint.setAlpha((int) (alpha * 255)); 14316 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 14317 layerRendered = true; 14318 } else { 14319 final int scrollX = hasDisplayList ? 0 : sx; 14320 final int scrollY = hasDisplayList ? 0 : sy; 14321 canvas.saveLayer(scrollX, scrollY, 14322 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 14323 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 14324 } 14325 } 14326 14327 if (!layerRendered) { 14328 if (!hasDisplayList) { 14329 // Fast path for layouts with no backgrounds 14330 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 14331 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 14332 dispatchDraw(canvas); 14333 } else { 14334 draw(canvas); 14335 } 14336 } else { 14337 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 14338 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 14339 } 14340 } 14341 } else if (cache != null) { 14342 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 14343 Paint cachePaint; 14344 14345 if (layerType == LAYER_TYPE_NONE) { 14346 cachePaint = parent.mCachePaint; 14347 if (cachePaint == null) { 14348 cachePaint = new Paint(); 14349 cachePaint.setDither(false); 14350 parent.mCachePaint = cachePaint; 14351 } 14352 if (alpha < 1) { 14353 cachePaint.setAlpha((int) (alpha * 255)); 14354 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 14355 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 14356 cachePaint.setAlpha(255); 14357 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 14358 } 14359 } else { 14360 cachePaint = mLayerPaint; 14361 cachePaint.setAlpha((int) (alpha * 255)); 14362 } 14363 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 14364 } 14365 14366 if (restoreTo >= 0) { 14367 canvas.restoreToCount(restoreTo); 14368 } 14369 14370 if (a != null && !more) { 14371 if (!hardwareAccelerated && !a.getFillAfter()) { 14372 onSetAlpha(255); 14373 } 14374 parent.finishAnimatingView(this, a); 14375 } 14376 14377 if (more && hardwareAccelerated) { 14378 if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 14379 // alpha animations should cause the child to recreate its display list 14380 invalidate(true); 14381 } 14382 } 14383 14384 mRecreateDisplayList = false; 14385 14386 return more; 14387 } 14388 14389 /** 14390 * Manually render this view (and all of its children) to the given Canvas. 14391 * The view must have already done a full layout before this function is 14392 * called. When implementing a view, implement 14393 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 14394 * If you do need to override this method, call the superclass version. 14395 * 14396 * @param canvas The Canvas to which the View is rendered. 14397 */ 14398 public void draw(Canvas canvas) { 14399 if (mClipBounds != null) { 14400 canvas.clipRect(mClipBounds); 14401 } 14402 final int privateFlags = mPrivateFlags; 14403 final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE && 14404 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 14405 mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 14406 14407 /* 14408 * Draw traversal performs several drawing steps which must be executed 14409 * in the appropriate order: 14410 * 14411 * 1. Draw the background 14412 * 2. If necessary, save the canvas' layers to prepare for fading 14413 * 3. Draw view's content 14414 * 4. Draw children 14415 * 5. If necessary, draw the fading edges and restore layers 14416 * 6. Draw decorations (scrollbars for instance) 14417 */ 14418 14419 // Step 1, draw the background, if needed 14420 int saveCount; 14421 14422 if (!dirtyOpaque) { 14423 final Drawable background = mBackground; 14424 if (background != null) { 14425 final int scrollX = mScrollX; 14426 final int scrollY = mScrollY; 14427 14428 if (mBackgroundSizeChanged) { 14429 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 14430 mBackgroundSizeChanged = false; 14431 } 14432 14433 if ((scrollX | scrollY) == 0) { 14434 background.draw(canvas); 14435 } else { 14436 canvas.translate(scrollX, scrollY); 14437 background.draw(canvas); 14438 canvas.translate(-scrollX, -scrollY); 14439 } 14440 } 14441 } 14442 14443 // skip step 2 & 5 if possible (common case) 14444 final int viewFlags = mViewFlags; 14445 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 14446 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 14447 if (!verticalEdges && !horizontalEdges) { 14448 // Step 3, draw the content 14449 if (!dirtyOpaque) onDraw(canvas); 14450 14451 // Step 4, draw the children 14452 dispatchDraw(canvas); 14453 14454 // Step 6, draw decorations (scrollbars) 14455 onDrawScrollBars(canvas); 14456 14457 if (mOverlay != null && !mOverlay.isEmpty()) { 14458 mOverlay.getOverlayView().dispatchDraw(canvas); 14459 } 14460 14461 // we're done... 14462 return; 14463 } 14464 14465 /* 14466 * Here we do the full fledged routine... 14467 * (this is an uncommon case where speed matters less, 14468 * this is why we repeat some of the tests that have been 14469 * done above) 14470 */ 14471 14472 boolean drawTop = false; 14473 boolean drawBottom = false; 14474 boolean drawLeft = false; 14475 boolean drawRight = false; 14476 14477 float topFadeStrength = 0.0f; 14478 float bottomFadeStrength = 0.0f; 14479 float leftFadeStrength = 0.0f; 14480 float rightFadeStrength = 0.0f; 14481 14482 // Step 2, save the canvas' layers 14483 int paddingLeft = mPaddingLeft; 14484 14485 final boolean offsetRequired = isPaddingOffsetRequired(); 14486 if (offsetRequired) { 14487 paddingLeft += getLeftPaddingOffset(); 14488 } 14489 14490 int left = mScrollX + paddingLeft; 14491 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 14492 int top = mScrollY + getFadeTop(offsetRequired); 14493 int bottom = top + getFadeHeight(offsetRequired); 14494 14495 if (offsetRequired) { 14496 right += getRightPaddingOffset(); 14497 bottom += getBottomPaddingOffset(); 14498 } 14499 14500 final ScrollabilityCache scrollabilityCache = mScrollCache; 14501 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 14502 int length = (int) fadeHeight; 14503 14504 // clip the fade length if top and bottom fades overlap 14505 // overlapping fades produce odd-looking artifacts 14506 if (verticalEdges && (top + length > bottom - length)) { 14507 length = (bottom - top) / 2; 14508 } 14509 14510 // also clip horizontal fades if necessary 14511 if (horizontalEdges && (left + length > right - length)) { 14512 length = (right - left) / 2; 14513 } 14514 14515 if (verticalEdges) { 14516 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 14517 drawTop = topFadeStrength * fadeHeight > 1.0f; 14518 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 14519 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 14520 } 14521 14522 if (horizontalEdges) { 14523 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 14524 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 14525 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 14526 drawRight = rightFadeStrength * fadeHeight > 1.0f; 14527 } 14528 14529 saveCount = canvas.getSaveCount(); 14530 14531 int solidColor = getSolidColor(); 14532 if (solidColor == 0) { 14533 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 14534 14535 if (drawTop) { 14536 canvas.saveLayer(left, top, right, top + length, null, flags); 14537 } 14538 14539 if (drawBottom) { 14540 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 14541 } 14542 14543 if (drawLeft) { 14544 canvas.saveLayer(left, top, left + length, bottom, null, flags); 14545 } 14546 14547 if (drawRight) { 14548 canvas.saveLayer(right - length, top, right, bottom, null, flags); 14549 } 14550 } else { 14551 scrollabilityCache.setFadeColor(solidColor); 14552 } 14553 14554 // Step 3, draw the content 14555 if (!dirtyOpaque) onDraw(canvas); 14556 14557 // Step 4, draw the children 14558 dispatchDraw(canvas); 14559 14560 // Step 5, draw the fade effect and restore layers 14561 final Paint p = scrollabilityCache.paint; 14562 final Matrix matrix = scrollabilityCache.matrix; 14563 final Shader fade = scrollabilityCache.shader; 14564 14565 if (drawTop) { 14566 matrix.setScale(1, fadeHeight * topFadeStrength); 14567 matrix.postTranslate(left, top); 14568 fade.setLocalMatrix(matrix); 14569 canvas.drawRect(left, top, right, top + length, p); 14570 } 14571 14572 if (drawBottom) { 14573 matrix.setScale(1, fadeHeight * bottomFadeStrength); 14574 matrix.postRotate(180); 14575 matrix.postTranslate(left, bottom); 14576 fade.setLocalMatrix(matrix); 14577 canvas.drawRect(left, bottom - length, right, bottom, p); 14578 } 14579 14580 if (drawLeft) { 14581 matrix.setScale(1, fadeHeight * leftFadeStrength); 14582 matrix.postRotate(-90); 14583 matrix.postTranslate(left, top); 14584 fade.setLocalMatrix(matrix); 14585 canvas.drawRect(left, top, left + length, bottom, p); 14586 } 14587 14588 if (drawRight) { 14589 matrix.setScale(1, fadeHeight * rightFadeStrength); 14590 matrix.postRotate(90); 14591 matrix.postTranslate(right, top); 14592 fade.setLocalMatrix(matrix); 14593 canvas.drawRect(right - length, top, right, bottom, p); 14594 } 14595 14596 canvas.restoreToCount(saveCount); 14597 14598 // Step 6, draw decorations (scrollbars) 14599 onDrawScrollBars(canvas); 14600 14601 if (mOverlay != null && !mOverlay.isEmpty()) { 14602 mOverlay.getOverlayView().dispatchDraw(canvas); 14603 } 14604 } 14605 14606 /** 14607 * Returns the overlay for this view, creating it if it does not yet exist. 14608 * Adding drawables to the overlay will cause them to be displayed whenever 14609 * the view itself is redrawn. Objects in the overlay should be actively 14610 * managed: remove them when they should not be displayed anymore. The 14611 * overlay will always have the same size as its host view. 14612 * 14613 * <p>Note: Overlays do not currently work correctly with {@link 14614 * SurfaceView} or {@link TextureView}; contents in overlays for these 14615 * types of views may not display correctly.</p> 14616 * 14617 * @return The ViewOverlay object for this view. 14618 * @see ViewOverlay 14619 */ 14620 public ViewOverlay getOverlay() { 14621 if (mOverlay == null) { 14622 mOverlay = new ViewOverlay(mContext, this); 14623 } 14624 return mOverlay; 14625 } 14626 14627 /** 14628 * Override this if your view is known to always be drawn on top of a solid color background, 14629 * and needs to draw fading edges. Returning a non-zero color enables the view system to 14630 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 14631 * should be set to 0xFF. 14632 * 14633 * @see #setVerticalFadingEdgeEnabled(boolean) 14634 * @see #setHorizontalFadingEdgeEnabled(boolean) 14635 * 14636 * @return The known solid color background for this view, or 0 if the color may vary 14637 */ 14638 @ViewDebug.ExportedProperty(category = "drawing") 14639 public int getSolidColor() { 14640 return 0; 14641 } 14642 14643 /** 14644 * Build a human readable string representation of the specified view flags. 14645 * 14646 * @param flags the view flags to convert to a string 14647 * @return a String representing the supplied flags 14648 */ 14649 private static String printFlags(int flags) { 14650 String output = ""; 14651 int numFlags = 0; 14652 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 14653 output += "TAKES_FOCUS"; 14654 numFlags++; 14655 } 14656 14657 switch (flags & VISIBILITY_MASK) { 14658 case INVISIBLE: 14659 if (numFlags > 0) { 14660 output += " "; 14661 } 14662 output += "INVISIBLE"; 14663 // USELESS HERE numFlags++; 14664 break; 14665 case GONE: 14666 if (numFlags > 0) { 14667 output += " "; 14668 } 14669 output += "GONE"; 14670 // USELESS HERE numFlags++; 14671 break; 14672 default: 14673 break; 14674 } 14675 return output; 14676 } 14677 14678 /** 14679 * Build a human readable string representation of the specified private 14680 * view flags. 14681 * 14682 * @param privateFlags the private view flags to convert to a string 14683 * @return a String representing the supplied flags 14684 */ 14685 private static String printPrivateFlags(int privateFlags) { 14686 String output = ""; 14687 int numFlags = 0; 14688 14689 if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) { 14690 output += "WANTS_FOCUS"; 14691 numFlags++; 14692 } 14693 14694 if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) { 14695 if (numFlags > 0) { 14696 output += " "; 14697 } 14698 output += "FOCUSED"; 14699 numFlags++; 14700 } 14701 14702 if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) { 14703 if (numFlags > 0) { 14704 output += " "; 14705 } 14706 output += "SELECTED"; 14707 numFlags++; 14708 } 14709 14710 if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) { 14711 if (numFlags > 0) { 14712 output += " "; 14713 } 14714 output += "IS_ROOT_NAMESPACE"; 14715 numFlags++; 14716 } 14717 14718 if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) { 14719 if (numFlags > 0) { 14720 output += " "; 14721 } 14722 output += "HAS_BOUNDS"; 14723 numFlags++; 14724 } 14725 14726 if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) { 14727 if (numFlags > 0) { 14728 output += " "; 14729 } 14730 output += "DRAWN"; 14731 // USELESS HERE numFlags++; 14732 } 14733 return output; 14734 } 14735 14736 /** 14737 * <p>Indicates whether or not this view's layout will be requested during 14738 * the next hierarchy layout pass.</p> 14739 * 14740 * @return true if the layout will be forced during next layout pass 14741 */ 14742 public boolean isLayoutRequested() { 14743 return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT; 14744 } 14745 14746 /** 14747 * Return true if o is a ViewGroup that is laying out using optical bounds. 14748 * @hide 14749 */ 14750 public static boolean isLayoutModeOptical(Object o) { 14751 return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical(); 14752 } 14753 14754 private boolean setOpticalFrame(int left, int top, int right, int bottom) { 14755 Insets parentInsets = mParent instanceof View ? 14756 ((View) mParent).getOpticalInsets() : Insets.NONE; 14757 Insets childInsets = getOpticalInsets(); 14758 return setFrame( 14759 left + parentInsets.left - childInsets.left, 14760 top + parentInsets.top - childInsets.top, 14761 right + parentInsets.left + childInsets.right, 14762 bottom + parentInsets.top + childInsets.bottom); 14763 } 14764 14765 /** 14766 * Assign a size and position to a view and all of its 14767 * descendants 14768 * 14769 * <p>This is the second phase of the layout mechanism. 14770 * (The first is measuring). In this phase, each parent calls 14771 * layout on all of its children to position them. 14772 * This is typically done using the child measurements 14773 * that were stored in the measure pass().</p> 14774 * 14775 * <p>Derived classes should not override this method. 14776 * Derived classes with children should override 14777 * onLayout. In that method, they should 14778 * call layout on each of their children.</p> 14779 * 14780 * @param l Left position, relative to parent 14781 * @param t Top position, relative to parent 14782 * @param r Right position, relative to parent 14783 * @param b Bottom position, relative to parent 14784 */ 14785 @SuppressWarnings({"unchecked"}) 14786 public void layout(int l, int t, int r, int b) { 14787 if ((mPrivateFlags3 & PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT) != 0) { 14788 onMeasure(mOldWidthMeasureSpec, mOldHeightMeasureSpec); 14789 mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 14790 } 14791 14792 int oldL = mLeft; 14793 int oldT = mTop; 14794 int oldB = mBottom; 14795 int oldR = mRight; 14796 14797 boolean changed = isLayoutModeOptical(mParent) ? 14798 setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b); 14799 14800 if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) { 14801 onLayout(changed, l, t, r, b); 14802 mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED; 14803 14804 ListenerInfo li = mListenerInfo; 14805 if (li != null && li.mOnLayoutChangeListeners != null) { 14806 ArrayList<OnLayoutChangeListener> listenersCopy = 14807 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 14808 int numListeners = listenersCopy.size(); 14809 for (int i = 0; i < numListeners; ++i) { 14810 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 14811 } 14812 } 14813 } 14814 14815 mPrivateFlags &= ~PFLAG_FORCE_LAYOUT; 14816 mPrivateFlags3 |= PFLAG3_IS_LAID_OUT; 14817 } 14818 14819 /** 14820 * Called from layout when this view should 14821 * assign a size and position to each of its children. 14822 * 14823 * Derived classes with children should override 14824 * this method and call layout on each of 14825 * their children. 14826 * @param changed This is a new size or position for this view 14827 * @param left Left position, relative to parent 14828 * @param top Top position, relative to parent 14829 * @param right Right position, relative to parent 14830 * @param bottom Bottom position, relative to parent 14831 */ 14832 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 14833 } 14834 14835 /** 14836 * Assign a size and position to this view. 14837 * 14838 * This is called from layout. 14839 * 14840 * @param left Left position, relative to parent 14841 * @param top Top position, relative to parent 14842 * @param right Right position, relative to parent 14843 * @param bottom Bottom position, relative to parent 14844 * @return true if the new size and position are different than the 14845 * previous ones 14846 * {@hide} 14847 */ 14848 protected boolean setFrame(int left, int top, int right, int bottom) { 14849 boolean changed = false; 14850 14851 if (DBG) { 14852 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 14853 + right + "," + bottom + ")"); 14854 } 14855 14856 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 14857 changed = true; 14858 14859 // Remember our drawn bit 14860 int drawn = mPrivateFlags & PFLAG_DRAWN; 14861 14862 int oldWidth = mRight - mLeft; 14863 int oldHeight = mBottom - mTop; 14864 int newWidth = right - left; 14865 int newHeight = bottom - top; 14866 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 14867 14868 // Invalidate our old position 14869 invalidate(sizeChanged); 14870 14871 mLeft = left; 14872 mTop = top; 14873 mRight = right; 14874 mBottom = bottom; 14875 if (mDisplayList != null) { 14876 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 14877 } 14878 14879 mPrivateFlags |= PFLAG_HAS_BOUNDS; 14880 14881 14882 if (sizeChanged) { 14883 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 14884 // A change in dimension means an auto-centered pivot point changes, too 14885 if (mTransformationInfo != null) { 14886 mTransformationInfo.mMatrixDirty = true; 14887 } 14888 } 14889 sizeChange(newWidth, newHeight, oldWidth, oldHeight); 14890 } 14891 14892 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 14893 // If we are visible, force the DRAWN bit to on so that 14894 // this invalidate will go through (at least to our parent). 14895 // This is because someone may have invalidated this view 14896 // before this call to setFrame came in, thereby clearing 14897 // the DRAWN bit. 14898 mPrivateFlags |= PFLAG_DRAWN; 14899 invalidate(sizeChanged); 14900 // parent display list may need to be recreated based on a change in the bounds 14901 // of any child 14902 invalidateParentCaches(); 14903 } 14904 14905 // Reset drawn bit to original value (invalidate turns it off) 14906 mPrivateFlags |= drawn; 14907 14908 mBackgroundSizeChanged = true; 14909 14910 notifySubtreeAccessibilityStateChangedIfNeeded(); 14911 } 14912 return changed; 14913 } 14914 14915 private void sizeChange(int newWidth, int newHeight, int oldWidth, int oldHeight) { 14916 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 14917 if (mOverlay != null) { 14918 mOverlay.getOverlayView().setRight(newWidth); 14919 mOverlay.getOverlayView().setBottom(newHeight); 14920 } 14921 } 14922 14923 /** 14924 * Finalize inflating a view from XML. This is called as the last phase 14925 * of inflation, after all child views have been added. 14926 * 14927 * <p>Even if the subclass overrides onFinishInflate, they should always be 14928 * sure to call the super method, so that we get called. 14929 */ 14930 protected void onFinishInflate() { 14931 } 14932 14933 /** 14934 * Returns the resources associated with this view. 14935 * 14936 * @return Resources object. 14937 */ 14938 public Resources getResources() { 14939 return mResources; 14940 } 14941 14942 /** 14943 * Invalidates the specified Drawable. 14944 * 14945 * @param drawable the drawable to invalidate 14946 */ 14947 public void invalidateDrawable(Drawable drawable) { 14948 if (verifyDrawable(drawable)) { 14949 final Rect dirty = drawable.getBounds(); 14950 final int scrollX = mScrollX; 14951 final int scrollY = mScrollY; 14952 14953 invalidate(dirty.left + scrollX, dirty.top + scrollY, 14954 dirty.right + scrollX, dirty.bottom + scrollY); 14955 } 14956 } 14957 14958 /** 14959 * Schedules an action on a drawable to occur at a specified time. 14960 * 14961 * @param who the recipient of the action 14962 * @param what the action to run on the drawable 14963 * @param when the time at which the action must occur. Uses the 14964 * {@link SystemClock#uptimeMillis} timebase. 14965 */ 14966 public void scheduleDrawable(Drawable who, Runnable what, long when) { 14967 if (verifyDrawable(who) && what != null) { 14968 final long delay = when - SystemClock.uptimeMillis(); 14969 if (mAttachInfo != null) { 14970 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 14971 Choreographer.CALLBACK_ANIMATION, what, who, 14972 Choreographer.subtractFrameDelay(delay)); 14973 } else { 14974 ViewRootImpl.getRunQueue().postDelayed(what, delay); 14975 } 14976 } 14977 } 14978 14979 /** 14980 * Cancels a scheduled action on a drawable. 14981 * 14982 * @param who the recipient of the action 14983 * @param what the action to cancel 14984 */ 14985 public void unscheduleDrawable(Drawable who, Runnable what) { 14986 if (verifyDrawable(who) && what != null) { 14987 if (mAttachInfo != null) { 14988 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14989 Choreographer.CALLBACK_ANIMATION, what, who); 14990 } else { 14991 ViewRootImpl.getRunQueue().removeCallbacks(what); 14992 } 14993 } 14994 } 14995 14996 /** 14997 * Unschedule any events associated with the given Drawable. This can be 14998 * used when selecting a new Drawable into a view, so that the previous 14999 * one is completely unscheduled. 15000 * 15001 * @param who The Drawable to unschedule. 15002 * 15003 * @see #drawableStateChanged 15004 */ 15005 public void unscheduleDrawable(Drawable who) { 15006 if (mAttachInfo != null && who != null) { 15007 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 15008 Choreographer.CALLBACK_ANIMATION, null, who); 15009 } 15010 } 15011 15012 /** 15013 * Resolve the Drawables depending on the layout direction. This is implicitly supposing 15014 * that the View directionality can and will be resolved before its Drawables. 15015 * 15016 * Will call {@link View#onResolveDrawables} when resolution is done. 15017 * 15018 * @hide 15019 */ 15020 protected void resolveDrawables() { 15021 // Drawables resolution may need to happen before resolving the layout direction (which is 15022 // done only during the measure() call). 15023 // If the layout direction is not resolved yet, we cannot resolve the Drawables except in 15024 // one case: when the raw layout direction has not been defined as LAYOUT_DIRECTION_INHERIT. 15025 // So, if the raw layout direction is LAYOUT_DIRECTION_LTR or LAYOUT_DIRECTION_RTL or 15026 // LAYOUT_DIRECTION_LOCALE, we can "cheat" and we don't need to wait for the layout 15027 // direction to be resolved as its resolved value will be the same as its raw value. 15028 if (!isLayoutDirectionResolved() && 15029 getRawLayoutDirection() == View.LAYOUT_DIRECTION_INHERIT) { 15030 return; 15031 } 15032 15033 final int layoutDirection = isLayoutDirectionResolved() ? 15034 getLayoutDirection() : getRawLayoutDirection(); 15035 15036 if (mBackground != null) { 15037 mBackground.setLayoutDirection(layoutDirection); 15038 } 15039 mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED; 15040 onResolveDrawables(layoutDirection); 15041 } 15042 15043 /** 15044 * Called when layout direction has been resolved. 15045 * 15046 * The default implementation does nothing. 15047 * 15048 * @param layoutDirection The resolved layout direction. 15049 * 15050 * @see #LAYOUT_DIRECTION_LTR 15051 * @see #LAYOUT_DIRECTION_RTL 15052 * 15053 * @hide 15054 */ 15055 public void onResolveDrawables(int layoutDirection) { 15056 } 15057 15058 /** 15059 * @hide 15060 */ 15061 protected void resetResolvedDrawables() { 15062 mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED; 15063 } 15064 15065 private boolean isDrawablesResolved() { 15066 return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED; 15067 } 15068 15069 /** 15070 * If your view subclass is displaying its own Drawable objects, it should 15071 * override this function and return true for any Drawable it is 15072 * displaying. This allows animations for those drawables to be 15073 * scheduled. 15074 * 15075 * <p>Be sure to call through to the super class when overriding this 15076 * function. 15077 * 15078 * @param who The Drawable to verify. Return true if it is one you are 15079 * displaying, else return the result of calling through to the 15080 * super class. 15081 * 15082 * @return boolean If true than the Drawable is being displayed in the 15083 * view; else false and it is not allowed to animate. 15084 * 15085 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 15086 * @see #drawableStateChanged() 15087 */ 15088 protected boolean verifyDrawable(Drawable who) { 15089 return who == mBackground; 15090 } 15091 15092 /** 15093 * This function is called whenever the state of the view changes in such 15094 * a way that it impacts the state of drawables being shown. 15095 * 15096 * <p>Be sure to call through to the superclass when overriding this 15097 * function. 15098 * 15099 * @see Drawable#setState(int[]) 15100 */ 15101 protected void drawableStateChanged() { 15102 Drawable d = mBackground; 15103 if (d != null && d.isStateful()) { 15104 d.setState(getDrawableState()); 15105 } 15106 } 15107 15108 /** 15109 * Call this to force a view to update its drawable state. This will cause 15110 * drawableStateChanged to be called on this view. Views that are interested 15111 * in the new state should call getDrawableState. 15112 * 15113 * @see #drawableStateChanged 15114 * @see #getDrawableState 15115 */ 15116 public void refreshDrawableState() { 15117 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 15118 drawableStateChanged(); 15119 15120 ViewParent parent = mParent; 15121 if (parent != null) { 15122 parent.childDrawableStateChanged(this); 15123 } 15124 } 15125 15126 /** 15127 * Return an array of resource IDs of the drawable states representing the 15128 * current state of the view. 15129 * 15130 * @return The current drawable state 15131 * 15132 * @see Drawable#setState(int[]) 15133 * @see #drawableStateChanged() 15134 * @see #onCreateDrawableState(int) 15135 */ 15136 public final int[] getDrawableState() { 15137 if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) { 15138 return mDrawableState; 15139 } else { 15140 mDrawableState = onCreateDrawableState(0); 15141 mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY; 15142 return mDrawableState; 15143 } 15144 } 15145 15146 /** 15147 * Generate the new {@link android.graphics.drawable.Drawable} state for 15148 * this view. This is called by the view 15149 * system when the cached Drawable state is determined to be invalid. To 15150 * retrieve the current state, you should use {@link #getDrawableState}. 15151 * 15152 * @param extraSpace if non-zero, this is the number of extra entries you 15153 * would like in the returned array in which you can place your own 15154 * states. 15155 * 15156 * @return Returns an array holding the current {@link Drawable} state of 15157 * the view. 15158 * 15159 * @see #mergeDrawableStates(int[], int[]) 15160 */ 15161 protected int[] onCreateDrawableState(int extraSpace) { 15162 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 15163 mParent instanceof View) { 15164 return ((View) mParent).onCreateDrawableState(extraSpace); 15165 } 15166 15167 int[] drawableState; 15168 15169 int privateFlags = mPrivateFlags; 15170 15171 int viewStateIndex = 0; 15172 if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 15173 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 15174 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 15175 if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 15176 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 15177 if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 15178 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 15179 HardwareRenderer.isAvailable()) { 15180 // This is set if HW acceleration is requested, even if the current 15181 // process doesn't allow it. This is just to allow app preview 15182 // windows to better match their app. 15183 viewStateIndex |= VIEW_STATE_ACCELERATED; 15184 } 15185 if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 15186 15187 final int privateFlags2 = mPrivateFlags2; 15188 if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 15189 if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 15190 15191 drawableState = VIEW_STATE_SETS[viewStateIndex]; 15192 15193 //noinspection ConstantIfStatement 15194 if (false) { 15195 Log.i("View", "drawableStateIndex=" + viewStateIndex); 15196 Log.i("View", toString() 15197 + " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0) 15198 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 15199 + " fo=" + hasFocus() 15200 + " sl=" + ((privateFlags & PFLAG_SELECTED) != 0) 15201 + " wf=" + hasWindowFocus() 15202 + ": " + Arrays.toString(drawableState)); 15203 } 15204 15205 if (extraSpace == 0) { 15206 return drawableState; 15207 } 15208 15209 final int[] fullState; 15210 if (drawableState != null) { 15211 fullState = new int[drawableState.length + extraSpace]; 15212 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 15213 } else { 15214 fullState = new int[extraSpace]; 15215 } 15216 15217 return fullState; 15218 } 15219 15220 /** 15221 * Merge your own state values in <var>additionalState</var> into the base 15222 * state values <var>baseState</var> that were returned by 15223 * {@link #onCreateDrawableState(int)}. 15224 * 15225 * @param baseState The base state values returned by 15226 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 15227 * own additional state values. 15228 * 15229 * @param additionalState The additional state values you would like 15230 * added to <var>baseState</var>; this array is not modified. 15231 * 15232 * @return As a convenience, the <var>baseState</var> array you originally 15233 * passed into the function is returned. 15234 * 15235 * @see #onCreateDrawableState(int) 15236 */ 15237 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 15238 final int N = baseState.length; 15239 int i = N - 1; 15240 while (i >= 0 && baseState[i] == 0) { 15241 i--; 15242 } 15243 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 15244 return baseState; 15245 } 15246 15247 /** 15248 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 15249 * on all Drawable objects associated with this view. 15250 */ 15251 public void jumpDrawablesToCurrentState() { 15252 if (mBackground != null) { 15253 mBackground.jumpToCurrentState(); 15254 } 15255 } 15256 15257 /** 15258 * Sets the background color for this view. 15259 * @param color the color of the background 15260 */ 15261 @RemotableViewMethod 15262 public void setBackgroundColor(int color) { 15263 if (mBackground instanceof ColorDrawable) { 15264 ((ColorDrawable) mBackground.mutate()).setColor(color); 15265 computeOpaqueFlags(); 15266 mBackgroundResource = 0; 15267 } else { 15268 setBackground(new ColorDrawable(color)); 15269 } 15270 } 15271 15272 /** 15273 * Set the background to a given resource. The resource should refer to 15274 * a Drawable object or 0 to remove the background. 15275 * @param resid The identifier of the resource. 15276 * 15277 * @attr ref android.R.styleable#View_background 15278 */ 15279 @RemotableViewMethod 15280 public void setBackgroundResource(int resid) { 15281 if (resid != 0 && resid == mBackgroundResource) { 15282 return; 15283 } 15284 15285 Drawable d= null; 15286 if (resid != 0) { 15287 d = mResources.getDrawable(resid); 15288 } 15289 setBackground(d); 15290 15291 mBackgroundResource = resid; 15292 } 15293 15294 /** 15295 * Set the background to a given Drawable, or remove the background. If the 15296 * background has padding, this View's padding is set to the background's 15297 * padding. However, when a background is removed, this View's padding isn't 15298 * touched. If setting the padding is desired, please use 15299 * {@link #setPadding(int, int, int, int)}. 15300 * 15301 * @param background The Drawable to use as the background, or null to remove the 15302 * background 15303 */ 15304 public void setBackground(Drawable background) { 15305 //noinspection deprecation 15306 setBackgroundDrawable(background); 15307 } 15308 15309 /** 15310 * @deprecated use {@link #setBackground(Drawable)} instead 15311 */ 15312 @Deprecated 15313 public void setBackgroundDrawable(Drawable background) { 15314 computeOpaqueFlags(); 15315 15316 if (background == mBackground) { 15317 return; 15318 } 15319 15320 boolean requestLayout = false; 15321 15322 mBackgroundResource = 0; 15323 15324 /* 15325 * Regardless of whether we're setting a new background or not, we want 15326 * to clear the previous drawable. 15327 */ 15328 if (mBackground != null) { 15329 mBackground.setCallback(null); 15330 unscheduleDrawable(mBackground); 15331 } 15332 15333 if (background != null) { 15334 Rect padding = sThreadLocal.get(); 15335 if (padding == null) { 15336 padding = new Rect(); 15337 sThreadLocal.set(padding); 15338 } 15339 resetResolvedDrawables(); 15340 background.setLayoutDirection(getLayoutDirection()); 15341 if (background.getPadding(padding)) { 15342 resetResolvedPadding(); 15343 switch (background.getLayoutDirection()) { 15344 case LAYOUT_DIRECTION_RTL: 15345 mUserPaddingLeftInitial = padding.right; 15346 mUserPaddingRightInitial = padding.left; 15347 internalSetPadding(padding.right, padding.top, padding.left, padding.bottom); 15348 break; 15349 case LAYOUT_DIRECTION_LTR: 15350 default: 15351 mUserPaddingLeftInitial = padding.left; 15352 mUserPaddingRightInitial = padding.right; 15353 internalSetPadding(padding.left, padding.top, padding.right, padding.bottom); 15354 } 15355 mUseBackgroundPadding = true; 15356 } else { 15357 mUseBackgroundPadding = false; 15358 } 15359 15360 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 15361 // if it has a different minimum size, we should layout again 15362 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 15363 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 15364 requestLayout = true; 15365 } 15366 15367 background.setCallback(this); 15368 if (background.isStateful()) { 15369 background.setState(getDrawableState()); 15370 } 15371 background.setVisible(getVisibility() == VISIBLE, false); 15372 mBackground = background; 15373 15374 if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) { 15375 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 15376 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 15377 requestLayout = true; 15378 } 15379 } else { 15380 /* Remove the background */ 15381 mBackground = null; 15382 15383 mUseBackgroundPadding = false; 15384 15385 if ((mPrivateFlags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0) { 15386 /* 15387 * This view ONLY drew the background before and we're removing 15388 * the background, so now it won't draw anything 15389 * (hence we SKIP_DRAW) 15390 */ 15391 mPrivateFlags &= ~PFLAG_ONLY_DRAWS_BACKGROUND; 15392 mPrivateFlags |= PFLAG_SKIP_DRAW; 15393 } 15394 15395 /* 15396 * When the background is set, we try to apply its padding to this 15397 * View. When the background is removed, we don't touch this View's 15398 * padding. This is noted in the Javadocs. Hence, we don't need to 15399 * requestLayout(), the invalidate() below is sufficient. 15400 */ 15401 15402 // The old background's minimum size could have affected this 15403 // View's layout, so let's requestLayout 15404 requestLayout = true; 15405 } 15406 15407 computeOpaqueFlags(); 15408 15409 if (requestLayout) { 15410 requestLayout(); 15411 } 15412 15413 mBackgroundSizeChanged = true; 15414 invalidate(true); 15415 } 15416 15417 /** 15418 * Gets the background drawable 15419 * 15420 * @return The drawable used as the background for this view, if any. 15421 * 15422 * @see #setBackground(Drawable) 15423 * 15424 * @attr ref android.R.styleable#View_background 15425 */ 15426 public Drawable getBackground() { 15427 return mBackground; 15428 } 15429 15430 /** 15431 * Sets the padding. The view may add on the space required to display 15432 * the scrollbars, depending on the style and visibility of the scrollbars. 15433 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 15434 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 15435 * from the values set in this call. 15436 * 15437 * @attr ref android.R.styleable#View_padding 15438 * @attr ref android.R.styleable#View_paddingBottom 15439 * @attr ref android.R.styleable#View_paddingLeft 15440 * @attr ref android.R.styleable#View_paddingRight 15441 * @attr ref android.R.styleable#View_paddingTop 15442 * @param left the left padding in pixels 15443 * @param top the top padding in pixels 15444 * @param right the right padding in pixels 15445 * @param bottom the bottom padding in pixels 15446 */ 15447 public void setPadding(int left, int top, int right, int bottom) { 15448 resetResolvedPadding(); 15449 15450 mUserPaddingStart = UNDEFINED_PADDING; 15451 mUserPaddingEnd = UNDEFINED_PADDING; 15452 15453 mUserPaddingLeftInitial = left; 15454 mUserPaddingRightInitial = right; 15455 15456 mUseBackgroundPadding = false; 15457 15458 internalSetPadding(left, top, right, bottom); 15459 } 15460 15461 /** 15462 * @hide 15463 */ 15464 protected void internalSetPadding(int left, int top, int right, int bottom) { 15465 mUserPaddingLeft = left; 15466 mUserPaddingRight = right; 15467 mUserPaddingBottom = bottom; 15468 15469 final int viewFlags = mViewFlags; 15470 boolean changed = false; 15471 15472 // Common case is there are no scroll bars. 15473 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 15474 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 15475 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 15476 ? 0 : getVerticalScrollbarWidth(); 15477 switch (mVerticalScrollbarPosition) { 15478 case SCROLLBAR_POSITION_DEFAULT: 15479 if (isLayoutRtl()) { 15480 left += offset; 15481 } else { 15482 right += offset; 15483 } 15484 break; 15485 case SCROLLBAR_POSITION_RIGHT: 15486 right += offset; 15487 break; 15488 case SCROLLBAR_POSITION_LEFT: 15489 left += offset; 15490 break; 15491 } 15492 } 15493 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 15494 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 15495 ? 0 : getHorizontalScrollbarHeight(); 15496 } 15497 } 15498 15499 if (mPaddingLeft != left) { 15500 changed = true; 15501 mPaddingLeft = left; 15502 } 15503 if (mPaddingTop != top) { 15504 changed = true; 15505 mPaddingTop = top; 15506 } 15507 if (mPaddingRight != right) { 15508 changed = true; 15509 mPaddingRight = right; 15510 } 15511 if (mPaddingBottom != bottom) { 15512 changed = true; 15513 mPaddingBottom = bottom; 15514 } 15515 15516 if (changed) { 15517 requestLayout(); 15518 } 15519 } 15520 15521 /** 15522 * Sets the relative padding. The view may add on the space required to display 15523 * the scrollbars, depending on the style and visibility of the scrollbars. 15524 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 15525 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 15526 * from the values set in this call. 15527 * 15528 * @attr ref android.R.styleable#View_padding 15529 * @attr ref android.R.styleable#View_paddingBottom 15530 * @attr ref android.R.styleable#View_paddingStart 15531 * @attr ref android.R.styleable#View_paddingEnd 15532 * @attr ref android.R.styleable#View_paddingTop 15533 * @param start the start padding in pixels 15534 * @param top the top padding in pixels 15535 * @param end the end padding in pixels 15536 * @param bottom the bottom padding in pixels 15537 */ 15538 public void setPaddingRelative(int start, int top, int end, int bottom) { 15539 resetResolvedPadding(); 15540 15541 mUserPaddingStart = start; 15542 mUserPaddingEnd = end; 15543 15544 mUseBackgroundPadding = false; 15545 15546 switch(getLayoutDirection()) { 15547 case LAYOUT_DIRECTION_RTL: 15548 mUserPaddingLeftInitial = end; 15549 mUserPaddingRightInitial = start; 15550 internalSetPadding(end, top, start, bottom); 15551 break; 15552 case LAYOUT_DIRECTION_LTR: 15553 default: 15554 mUserPaddingLeftInitial = start; 15555 mUserPaddingRightInitial = end; 15556 internalSetPadding(start, top, end, bottom); 15557 } 15558 } 15559 15560 /** 15561 * Returns the top padding of this view. 15562 * 15563 * @return the top padding in pixels 15564 */ 15565 public int getPaddingTop() { 15566 return mPaddingTop; 15567 } 15568 15569 /** 15570 * Returns the bottom padding of this view. If there are inset and enabled 15571 * scrollbars, this value may include the space required to display the 15572 * scrollbars as well. 15573 * 15574 * @return the bottom padding in pixels 15575 */ 15576 public int getPaddingBottom() { 15577 return mPaddingBottom; 15578 } 15579 15580 /** 15581 * Returns the left padding of this view. If there are inset and enabled 15582 * scrollbars, this value may include the space required to display the 15583 * scrollbars as well. 15584 * 15585 * @return the left padding in pixels 15586 */ 15587 public int getPaddingLeft() { 15588 if (!isPaddingResolved()) { 15589 resolvePadding(); 15590 } 15591 return mPaddingLeft; 15592 } 15593 15594 /** 15595 * Returns the start padding of this view depending on its resolved layout direction. 15596 * If there are inset and enabled scrollbars, this value may include the space 15597 * required to display the scrollbars as well. 15598 * 15599 * @return the start padding in pixels 15600 */ 15601 public int getPaddingStart() { 15602 if (!isPaddingResolved()) { 15603 resolvePadding(); 15604 } 15605 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15606 mPaddingRight : mPaddingLeft; 15607 } 15608 15609 /** 15610 * Returns the right padding of this view. If there are inset and enabled 15611 * scrollbars, this value may include the space required to display the 15612 * scrollbars as well. 15613 * 15614 * @return the right padding in pixels 15615 */ 15616 public int getPaddingRight() { 15617 if (!isPaddingResolved()) { 15618 resolvePadding(); 15619 } 15620 return mPaddingRight; 15621 } 15622 15623 /** 15624 * Returns the end padding of this view depending on its resolved layout direction. 15625 * If there are inset and enabled scrollbars, this value may include the space 15626 * required to display the scrollbars as well. 15627 * 15628 * @return the end padding in pixels 15629 */ 15630 public int getPaddingEnd() { 15631 if (!isPaddingResolved()) { 15632 resolvePadding(); 15633 } 15634 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15635 mPaddingLeft : mPaddingRight; 15636 } 15637 15638 /** 15639 * Return if the padding as been set thru relative values 15640 * {@link #setPaddingRelative(int, int, int, int)} or thru 15641 * @attr ref android.R.styleable#View_paddingStart or 15642 * @attr ref android.R.styleable#View_paddingEnd 15643 * 15644 * @return true if the padding is relative or false if it is not. 15645 */ 15646 public boolean isPaddingRelative() { 15647 return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING); 15648 } 15649 15650 Insets computeOpticalInsets() { 15651 return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets(); 15652 } 15653 15654 /** 15655 * @hide 15656 */ 15657 public void resetPaddingToInitialValues() { 15658 if (isRtlCompatibilityMode()) { 15659 mPaddingLeft = mUserPaddingLeftInitial; 15660 mPaddingRight = mUserPaddingRightInitial; 15661 return; 15662 } 15663 if (isLayoutRtl()) { 15664 mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial; 15665 mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial; 15666 } else { 15667 mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial; 15668 mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial; 15669 } 15670 } 15671 15672 /** 15673 * @hide 15674 */ 15675 public Insets getOpticalInsets() { 15676 if (mLayoutInsets == null) { 15677 mLayoutInsets = computeOpticalInsets(); 15678 } 15679 return mLayoutInsets; 15680 } 15681 15682 /** 15683 * Changes the selection state of this view. A view can be selected or not. 15684 * Note that selection is not the same as focus. Views are typically 15685 * selected in the context of an AdapterView like ListView or GridView; 15686 * the selected view is the view that is highlighted. 15687 * 15688 * @param selected true if the view must be selected, false otherwise 15689 */ 15690 public void setSelected(boolean selected) { 15691 //noinspection DoubleNegation 15692 if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) { 15693 mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0); 15694 if (!selected) resetPressedState(); 15695 invalidate(true); 15696 refreshDrawableState(); 15697 dispatchSetSelected(selected); 15698 notifyViewAccessibilityStateChangedIfNeeded( 15699 AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED); 15700 } 15701 } 15702 15703 /** 15704 * Dispatch setSelected to all of this View's children. 15705 * 15706 * @see #setSelected(boolean) 15707 * 15708 * @param selected The new selected state 15709 */ 15710 protected void dispatchSetSelected(boolean selected) { 15711 } 15712 15713 /** 15714 * Indicates the selection state of this view. 15715 * 15716 * @return true if the view is selected, false otherwise 15717 */ 15718 @ViewDebug.ExportedProperty 15719 public boolean isSelected() { 15720 return (mPrivateFlags & PFLAG_SELECTED) != 0; 15721 } 15722 15723 /** 15724 * Changes the activated state of this view. A view can be activated or not. 15725 * Note that activation is not the same as selection. Selection is 15726 * a transient property, representing the view (hierarchy) the user is 15727 * currently interacting with. Activation is a longer-term state that the 15728 * user can move views in and out of. For example, in a list view with 15729 * single or multiple selection enabled, the views in the current selection 15730 * set are activated. (Um, yeah, we are deeply sorry about the terminology 15731 * here.) The activated state is propagated down to children of the view it 15732 * is set on. 15733 * 15734 * @param activated true if the view must be activated, false otherwise 15735 */ 15736 public void setActivated(boolean activated) { 15737 //noinspection DoubleNegation 15738 if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) { 15739 mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0); 15740 invalidate(true); 15741 refreshDrawableState(); 15742 dispatchSetActivated(activated); 15743 } 15744 } 15745 15746 /** 15747 * Dispatch setActivated to all of this View's children. 15748 * 15749 * @see #setActivated(boolean) 15750 * 15751 * @param activated The new activated state 15752 */ 15753 protected void dispatchSetActivated(boolean activated) { 15754 } 15755 15756 /** 15757 * Indicates the activation state of this view. 15758 * 15759 * @return true if the view is activated, false otherwise 15760 */ 15761 @ViewDebug.ExportedProperty 15762 public boolean isActivated() { 15763 return (mPrivateFlags & PFLAG_ACTIVATED) != 0; 15764 } 15765 15766 /** 15767 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 15768 * observer can be used to get notifications when global events, like 15769 * layout, happen. 15770 * 15771 * The returned ViewTreeObserver observer is not guaranteed to remain 15772 * valid for the lifetime of this View. If the caller of this method keeps 15773 * a long-lived reference to ViewTreeObserver, it should always check for 15774 * the return value of {@link ViewTreeObserver#isAlive()}. 15775 * 15776 * @return The ViewTreeObserver for this view's hierarchy. 15777 */ 15778 public ViewTreeObserver getViewTreeObserver() { 15779 if (mAttachInfo != null) { 15780 return mAttachInfo.mTreeObserver; 15781 } 15782 if (mFloatingTreeObserver == null) { 15783 mFloatingTreeObserver = new ViewTreeObserver(); 15784 } 15785 return mFloatingTreeObserver; 15786 } 15787 15788 /** 15789 * <p>Finds the topmost view in the current view hierarchy.</p> 15790 * 15791 * @return the topmost view containing this view 15792 */ 15793 public View getRootView() { 15794 if (mAttachInfo != null) { 15795 final View v = mAttachInfo.mRootView; 15796 if (v != null) { 15797 return v; 15798 } 15799 } 15800 15801 View parent = this; 15802 15803 while (parent.mParent != null && parent.mParent instanceof View) { 15804 parent = (View) parent.mParent; 15805 } 15806 15807 return parent; 15808 } 15809 15810 /** 15811 * Transforms a motion event from view-local coordinates to on-screen 15812 * coordinates. 15813 * 15814 * @param ev the view-local motion event 15815 * @return false if the transformation could not be applied 15816 * @hide 15817 */ 15818 public boolean toGlobalMotionEvent(MotionEvent ev) { 15819 final AttachInfo info = mAttachInfo; 15820 if (info == null) { 15821 return false; 15822 } 15823 15824 transformMotionEventToGlobal(ev); 15825 ev.offsetLocation(info.mWindowLeft, info.mWindowTop); 15826 return true; 15827 } 15828 15829 /** 15830 * Transforms a motion event from on-screen coordinates to view-local 15831 * coordinates. 15832 * 15833 * @param ev the on-screen motion event 15834 * @return false if the transformation could not be applied 15835 * @hide 15836 */ 15837 public boolean toLocalMotionEvent(MotionEvent ev) { 15838 final AttachInfo info = mAttachInfo; 15839 if (info == null) { 15840 return false; 15841 } 15842 15843 ev.offsetLocation(-info.mWindowLeft, -info.mWindowTop); 15844 transformMotionEventToLocal(ev); 15845 return true; 15846 } 15847 15848 /** 15849 * Recursive helper method that applies transformations in post-order. 15850 * 15851 * @param ev the on-screen motion event 15852 */ 15853 private void transformMotionEventToLocal(MotionEvent ev) { 15854 final ViewParent parent = mParent; 15855 if (parent instanceof View) { 15856 final View vp = (View) parent; 15857 vp.transformMotionEventToLocal(ev); 15858 ev.offsetLocation(vp.mScrollX, vp.mScrollY); 15859 } else if (parent instanceof ViewRootImpl) { 15860 final ViewRootImpl vr = (ViewRootImpl) parent; 15861 ev.offsetLocation(0, vr.mCurScrollY); 15862 } 15863 15864 ev.offsetLocation(-mLeft, -mTop); 15865 15866 if (!hasIdentityMatrix()) { 15867 ev.transform(getInverseMatrix()); 15868 } 15869 } 15870 15871 /** 15872 * Recursive helper method that applies transformations in pre-order. 15873 * 15874 * @param ev the on-screen motion event 15875 */ 15876 private void transformMotionEventToGlobal(MotionEvent ev) { 15877 if (!hasIdentityMatrix()) { 15878 ev.transform(getMatrix()); 15879 } 15880 15881 ev.offsetLocation(mLeft, mTop); 15882 15883 final ViewParent parent = mParent; 15884 if (parent instanceof View) { 15885 final View vp = (View) parent; 15886 ev.offsetLocation(-vp.mScrollX, -vp.mScrollY); 15887 vp.transformMotionEventToGlobal(ev); 15888 } else if (parent instanceof ViewRootImpl) { 15889 final ViewRootImpl vr = (ViewRootImpl) parent; 15890 ev.offsetLocation(0, -vr.mCurScrollY); 15891 } 15892 } 15893 15894 /** 15895 * <p>Computes the coordinates of this view on the screen. The argument 15896 * must be an array of two integers. After the method returns, the array 15897 * contains the x and y location in that order.</p> 15898 * 15899 * @param location an array of two integers in which to hold the coordinates 15900 */ 15901 public void getLocationOnScreen(int[] location) { 15902 getLocationInWindow(location); 15903 15904 final AttachInfo info = mAttachInfo; 15905 if (info != null) { 15906 location[0] += info.mWindowLeft; 15907 location[1] += info.mWindowTop; 15908 } 15909 } 15910 15911 /** 15912 * <p>Computes the coordinates of this view in its window. The argument 15913 * must be an array of two integers. After the method returns, the array 15914 * contains the x and y location in that order.</p> 15915 * 15916 * @param location an array of two integers in which to hold the coordinates 15917 */ 15918 public void getLocationInWindow(int[] location) { 15919 if (location == null || location.length < 2) { 15920 throw new IllegalArgumentException("location must be an array of two integers"); 15921 } 15922 15923 if (mAttachInfo == null) { 15924 // When the view is not attached to a window, this method does not make sense 15925 location[0] = location[1] = 0; 15926 return; 15927 } 15928 15929 float[] position = mAttachInfo.mTmpTransformLocation; 15930 position[0] = position[1] = 0.0f; 15931 15932 if (!hasIdentityMatrix()) { 15933 getMatrix().mapPoints(position); 15934 } 15935 15936 position[0] += mLeft; 15937 position[1] += mTop; 15938 15939 ViewParent viewParent = mParent; 15940 while (viewParent instanceof View) { 15941 final View view = (View) viewParent; 15942 15943 position[0] -= view.mScrollX; 15944 position[1] -= view.mScrollY; 15945 15946 if (!view.hasIdentityMatrix()) { 15947 view.getMatrix().mapPoints(position); 15948 } 15949 15950 position[0] += view.mLeft; 15951 position[1] += view.mTop; 15952 15953 viewParent = view.mParent; 15954 } 15955 15956 if (viewParent instanceof ViewRootImpl) { 15957 // *cough* 15958 final ViewRootImpl vr = (ViewRootImpl) viewParent; 15959 position[1] -= vr.mCurScrollY; 15960 } 15961 15962 location[0] = (int) (position[0] + 0.5f); 15963 location[1] = (int) (position[1] + 0.5f); 15964 } 15965 15966 /** 15967 * {@hide} 15968 * @param id the id of the view to be found 15969 * @return the view of the specified id, null if cannot be found 15970 */ 15971 protected View findViewTraversal(int id) { 15972 if (id == mID) { 15973 return this; 15974 } 15975 return null; 15976 } 15977 15978 /** 15979 * {@hide} 15980 * @param tag the tag of the view to be found 15981 * @return the view of specified tag, null if cannot be found 15982 */ 15983 protected View findViewWithTagTraversal(Object tag) { 15984 if (tag != null && tag.equals(mTag)) { 15985 return this; 15986 } 15987 return null; 15988 } 15989 15990 /** 15991 * {@hide} 15992 * @param predicate The predicate to evaluate. 15993 * @param childToSkip If not null, ignores this child during the recursive traversal. 15994 * @return The first view that matches the predicate or null. 15995 */ 15996 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 15997 if (predicate.apply(this)) { 15998 return this; 15999 } 16000 return null; 16001 } 16002 16003 /** 16004 * Look for a child view with the given id. If this view has the given 16005 * id, return this view. 16006 * 16007 * @param id The id to search for. 16008 * @return The view that has the given id in the hierarchy or null 16009 */ 16010 public final View findViewById(int id) { 16011 if (id < 0) { 16012 return null; 16013 } 16014 return findViewTraversal(id); 16015 } 16016 16017 /** 16018 * Finds a view by its unuque and stable accessibility id. 16019 * 16020 * @param accessibilityId The searched accessibility id. 16021 * @return The found view. 16022 */ 16023 final View findViewByAccessibilityId(int accessibilityId) { 16024 if (accessibilityId < 0) { 16025 return null; 16026 } 16027 return findViewByAccessibilityIdTraversal(accessibilityId); 16028 } 16029 16030 /** 16031 * Performs the traversal to find a view by its unuque and stable accessibility id. 16032 * 16033 * <strong>Note:</strong>This method does not stop at the root namespace 16034 * boundary since the user can touch the screen at an arbitrary location 16035 * potentially crossing the root namespace bounday which will send an 16036 * accessibility event to accessibility services and they should be able 16037 * to obtain the event source. Also accessibility ids are guaranteed to be 16038 * unique in the window. 16039 * 16040 * @param accessibilityId The accessibility id. 16041 * @return The found view. 16042 * 16043 * @hide 16044 */ 16045 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 16046 if (getAccessibilityViewId() == accessibilityId) { 16047 return this; 16048 } 16049 return null; 16050 } 16051 16052 /** 16053 * Look for a child view with the given tag. If this view has the given 16054 * tag, return this view. 16055 * 16056 * @param tag The tag to search for, using "tag.equals(getTag())". 16057 * @return The View that has the given tag in the hierarchy or null 16058 */ 16059 public final View findViewWithTag(Object tag) { 16060 if (tag == null) { 16061 return null; 16062 } 16063 return findViewWithTagTraversal(tag); 16064 } 16065 16066 /** 16067 * {@hide} 16068 * Look for a child view that matches the specified predicate. 16069 * If this view matches the predicate, return this view. 16070 * 16071 * @param predicate The predicate to evaluate. 16072 * @return The first view that matches the predicate or null. 16073 */ 16074 public final View findViewByPredicate(Predicate<View> predicate) { 16075 return findViewByPredicateTraversal(predicate, null); 16076 } 16077 16078 /** 16079 * {@hide} 16080 * Look for a child view that matches the specified predicate, 16081 * starting with the specified view and its descendents and then 16082 * recusively searching the ancestors and siblings of that view 16083 * until this view is reached. 16084 * 16085 * This method is useful in cases where the predicate does not match 16086 * a single unique view (perhaps multiple views use the same id) 16087 * and we are trying to find the view that is "closest" in scope to the 16088 * starting view. 16089 * 16090 * @param start The view to start from. 16091 * @param predicate The predicate to evaluate. 16092 * @return The first view that matches the predicate or null. 16093 */ 16094 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 16095 View childToSkip = null; 16096 for (;;) { 16097 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 16098 if (view != null || start == this) { 16099 return view; 16100 } 16101 16102 ViewParent parent = start.getParent(); 16103 if (parent == null || !(parent instanceof View)) { 16104 return null; 16105 } 16106 16107 childToSkip = start; 16108 start = (View) parent; 16109 } 16110 } 16111 16112 /** 16113 * Sets the identifier for this view. The identifier does not have to be 16114 * unique in this view's hierarchy. The identifier should be a positive 16115 * number. 16116 * 16117 * @see #NO_ID 16118 * @see #getId() 16119 * @see #findViewById(int) 16120 * 16121 * @param id a number used to identify the view 16122 * 16123 * @attr ref android.R.styleable#View_id 16124 */ 16125 public void setId(int id) { 16126 mID = id; 16127 if (mID == View.NO_ID && mLabelForId != View.NO_ID) { 16128 mID = generateViewId(); 16129 } 16130 } 16131 16132 /** 16133 * {@hide} 16134 * 16135 * @param isRoot true if the view belongs to the root namespace, false 16136 * otherwise 16137 */ 16138 public void setIsRootNamespace(boolean isRoot) { 16139 if (isRoot) { 16140 mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE; 16141 } else { 16142 mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE; 16143 } 16144 } 16145 16146 /** 16147 * {@hide} 16148 * 16149 * @return true if the view belongs to the root namespace, false otherwise 16150 */ 16151 public boolean isRootNamespace() { 16152 return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0; 16153 } 16154 16155 /** 16156 * Returns this view's identifier. 16157 * 16158 * @return a positive integer used to identify the view or {@link #NO_ID} 16159 * if the view has no ID 16160 * 16161 * @see #setId(int) 16162 * @see #findViewById(int) 16163 * @attr ref android.R.styleable#View_id 16164 */ 16165 @ViewDebug.CapturedViewProperty 16166 public int getId() { 16167 return mID; 16168 } 16169 16170 /** 16171 * Returns this view's tag. 16172 * 16173 * @return the Object stored in this view as a tag 16174 * 16175 * @see #setTag(Object) 16176 * @see #getTag(int) 16177 */ 16178 @ViewDebug.ExportedProperty 16179 public Object getTag() { 16180 return mTag; 16181 } 16182 16183 /** 16184 * Sets the tag associated with this view. A tag can be used to mark 16185 * a view in its hierarchy and does not have to be unique within the 16186 * hierarchy. Tags can also be used to store data within a view without 16187 * resorting to another data structure. 16188 * 16189 * @param tag an Object to tag the view with 16190 * 16191 * @see #getTag() 16192 * @see #setTag(int, Object) 16193 */ 16194 public void setTag(final Object tag) { 16195 mTag = tag; 16196 } 16197 16198 /** 16199 * Returns the tag associated with this view and the specified key. 16200 * 16201 * @param key The key identifying the tag 16202 * 16203 * @return the Object stored in this view as a tag 16204 * 16205 * @see #setTag(int, Object) 16206 * @see #getTag() 16207 */ 16208 public Object getTag(int key) { 16209 if (mKeyedTags != null) return mKeyedTags.get(key); 16210 return null; 16211 } 16212 16213 /** 16214 * Sets a tag associated with this view and a key. A tag can be used 16215 * to mark a view in its hierarchy and does not have to be unique within 16216 * the hierarchy. Tags can also be used to store data within a view 16217 * without resorting to another data structure. 16218 * 16219 * The specified key should be an id declared in the resources of the 16220 * application to ensure it is unique (see the <a 16221 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 16222 * Keys identified as belonging to 16223 * the Android framework or not associated with any package will cause 16224 * an {@link IllegalArgumentException} to be thrown. 16225 * 16226 * @param key The key identifying the tag 16227 * @param tag An Object to tag the view with 16228 * 16229 * @throws IllegalArgumentException If they specified key is not valid 16230 * 16231 * @see #setTag(Object) 16232 * @see #getTag(int) 16233 */ 16234 public void setTag(int key, final Object tag) { 16235 // If the package id is 0x00 or 0x01, it's either an undefined package 16236 // or a framework id 16237 if ((key >>> 24) < 2) { 16238 throw new IllegalArgumentException("The key must be an application-specific " 16239 + "resource id."); 16240 } 16241 16242 setKeyedTag(key, tag); 16243 } 16244 16245 /** 16246 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 16247 * framework id. 16248 * 16249 * @hide 16250 */ 16251 public void setTagInternal(int key, Object tag) { 16252 if ((key >>> 24) != 0x1) { 16253 throw new IllegalArgumentException("The key must be a framework-specific " 16254 + "resource id."); 16255 } 16256 16257 setKeyedTag(key, tag); 16258 } 16259 16260 private void setKeyedTag(int key, Object tag) { 16261 if (mKeyedTags == null) { 16262 mKeyedTags = new SparseArray<Object>(2); 16263 } 16264 16265 mKeyedTags.put(key, tag); 16266 } 16267 16268 /** 16269 * Prints information about this view in the log output, with the tag 16270 * {@link #VIEW_LOG_TAG}. 16271 * 16272 * @hide 16273 */ 16274 public void debug() { 16275 debug(0); 16276 } 16277 16278 /** 16279 * Prints information about this view in the log output, with the tag 16280 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 16281 * indentation defined by the <code>depth</code>. 16282 * 16283 * @param depth the indentation level 16284 * 16285 * @hide 16286 */ 16287 protected void debug(int depth) { 16288 String output = debugIndent(depth - 1); 16289 16290 output += "+ " + this; 16291 int id = getId(); 16292 if (id != -1) { 16293 output += " (id=" + id + ")"; 16294 } 16295 Object tag = getTag(); 16296 if (tag != null) { 16297 output += " (tag=" + tag + ")"; 16298 } 16299 Log.d(VIEW_LOG_TAG, output); 16300 16301 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 16302 output = debugIndent(depth) + " FOCUSED"; 16303 Log.d(VIEW_LOG_TAG, output); 16304 } 16305 16306 output = debugIndent(depth); 16307 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 16308 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 16309 + "} "; 16310 Log.d(VIEW_LOG_TAG, output); 16311 16312 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 16313 || mPaddingBottom != 0) { 16314 output = debugIndent(depth); 16315 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 16316 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 16317 Log.d(VIEW_LOG_TAG, output); 16318 } 16319 16320 output = debugIndent(depth); 16321 output += "mMeasureWidth=" + mMeasuredWidth + 16322 " mMeasureHeight=" + mMeasuredHeight; 16323 Log.d(VIEW_LOG_TAG, output); 16324 16325 output = debugIndent(depth); 16326 if (mLayoutParams == null) { 16327 output += "BAD! no layout params"; 16328 } else { 16329 output = mLayoutParams.debug(output); 16330 } 16331 Log.d(VIEW_LOG_TAG, output); 16332 16333 output = debugIndent(depth); 16334 output += "flags={"; 16335 output += View.printFlags(mViewFlags); 16336 output += "}"; 16337 Log.d(VIEW_LOG_TAG, output); 16338 16339 output = debugIndent(depth); 16340 output += "privateFlags={"; 16341 output += View.printPrivateFlags(mPrivateFlags); 16342 output += "}"; 16343 Log.d(VIEW_LOG_TAG, output); 16344 } 16345 16346 /** 16347 * Creates a string of whitespaces used for indentation. 16348 * 16349 * @param depth the indentation level 16350 * @return a String containing (depth * 2 + 3) * 2 white spaces 16351 * 16352 * @hide 16353 */ 16354 protected static String debugIndent(int depth) { 16355 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 16356 for (int i = 0; i < (depth * 2) + 3; i++) { 16357 spaces.append(' ').append(' '); 16358 } 16359 return spaces.toString(); 16360 } 16361 16362 /** 16363 * <p>Return the offset of the widget's text baseline from the widget's top 16364 * boundary. If this widget does not support baseline alignment, this 16365 * method returns -1. </p> 16366 * 16367 * @return the offset of the baseline within the widget's bounds or -1 16368 * if baseline alignment is not supported 16369 */ 16370 @ViewDebug.ExportedProperty(category = "layout") 16371 public int getBaseline() { 16372 return -1; 16373 } 16374 16375 /** 16376 * Returns whether the view hierarchy is currently undergoing a layout pass. This 16377 * information is useful to avoid situations such as calling {@link #requestLayout()} during 16378 * a layout pass. 16379 * 16380 * @return whether the view hierarchy is currently undergoing a layout pass 16381 */ 16382 public boolean isInLayout() { 16383 ViewRootImpl viewRoot = getViewRootImpl(); 16384 return (viewRoot != null && viewRoot.isInLayout()); 16385 } 16386 16387 /** 16388 * Call this when something has changed which has invalidated the 16389 * layout of this view. This will schedule a layout pass of the view 16390 * tree. This should not be called while the view hierarchy is currently in a layout 16391 * pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the 16392 * end of the current layout pass (and then layout will run again) or after the current 16393 * frame is drawn and the next layout occurs. 16394 * 16395 * <p>Subclasses which override this method should call the superclass method to 16396 * handle possible request-during-layout errors correctly.</p> 16397 */ 16398 public void requestLayout() { 16399 if (mMeasureCache != null) mMeasureCache.clear(); 16400 16401 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) { 16402 // Only trigger request-during-layout logic if this is the view requesting it, 16403 // not the views in its parent hierarchy 16404 ViewRootImpl viewRoot = getViewRootImpl(); 16405 if (viewRoot != null && viewRoot.isInLayout()) { 16406 if (!viewRoot.requestLayoutDuringLayout(this)) { 16407 return; 16408 } 16409 } 16410 mAttachInfo.mViewRequestingLayout = this; 16411 } 16412 16413 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 16414 mPrivateFlags |= PFLAG_INVALIDATED; 16415 16416 if (mParent != null && !mParent.isLayoutRequested()) { 16417 mParent.requestLayout(); 16418 } 16419 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == this) { 16420 mAttachInfo.mViewRequestingLayout = null; 16421 } 16422 } 16423 16424 /** 16425 * Forces this view to be laid out during the next layout pass. 16426 * This method does not call requestLayout() or forceLayout() 16427 * on the parent. 16428 */ 16429 public void forceLayout() { 16430 if (mMeasureCache != null) mMeasureCache.clear(); 16431 16432 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 16433 mPrivateFlags |= PFLAG_INVALIDATED; 16434 } 16435 16436 /** 16437 * <p> 16438 * This is called to find out how big a view should be. The parent 16439 * supplies constraint information in the width and height parameters. 16440 * </p> 16441 * 16442 * <p> 16443 * The actual measurement work of a view is performed in 16444 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 16445 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 16446 * </p> 16447 * 16448 * 16449 * @param widthMeasureSpec Horizontal space requirements as imposed by the 16450 * parent 16451 * @param heightMeasureSpec Vertical space requirements as imposed by the 16452 * parent 16453 * 16454 * @see #onMeasure(int, int) 16455 */ 16456 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 16457 boolean optical = isLayoutModeOptical(this); 16458 if (optical != isLayoutModeOptical(mParent)) { 16459 Insets insets = getOpticalInsets(); 16460 int oWidth = insets.left + insets.right; 16461 int oHeight = insets.top + insets.bottom; 16462 widthMeasureSpec = MeasureSpec.adjust(widthMeasureSpec, optical ? -oWidth : oWidth); 16463 heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight); 16464 } 16465 16466 // Suppress sign extension for the low bytes 16467 long key = (long) widthMeasureSpec << 32 | (long) heightMeasureSpec & 0xffffffffL; 16468 if (mMeasureCache == null) mMeasureCache = new LongSparseLongArray(2); 16469 16470 if ((mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT || 16471 widthMeasureSpec != mOldWidthMeasureSpec || 16472 heightMeasureSpec != mOldHeightMeasureSpec) { 16473 16474 // first clears the measured dimension flag 16475 mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET; 16476 16477 resolveRtlPropertiesIfNeeded(); 16478 16479 int cacheIndex = (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT ? -1 : 16480 mMeasureCache.indexOfKey(key); 16481 if (cacheIndex < 0 || sIgnoreMeasureCache) { 16482 // measure ourselves, this should set the measured dimension flag back 16483 onMeasure(widthMeasureSpec, heightMeasureSpec); 16484 mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 16485 } else { 16486 long value = mMeasureCache.valueAt(cacheIndex); 16487 // Casting a long to int drops the high 32 bits, no mask needed 16488 setMeasuredDimension((int) (value >> 32), (int) value); 16489 mPrivateFlags3 |= PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 16490 } 16491 16492 // flag not set, setMeasuredDimension() was not invoked, we raise 16493 // an exception to warn the developer 16494 if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) { 16495 throw new IllegalStateException("onMeasure() did not set the" 16496 + " measured dimension by calling" 16497 + " setMeasuredDimension()"); 16498 } 16499 16500 mPrivateFlags |= PFLAG_LAYOUT_REQUIRED; 16501 } 16502 16503 mOldWidthMeasureSpec = widthMeasureSpec; 16504 mOldHeightMeasureSpec = heightMeasureSpec; 16505 16506 mMeasureCache.put(key, ((long) mMeasuredWidth) << 32 | 16507 (long) mMeasuredHeight & 0xffffffffL); // suppress sign extension 16508 } 16509 16510 /** 16511 * <p> 16512 * Measure the view and its content to determine the measured width and the 16513 * measured height. This method is invoked by {@link #measure(int, int)} and 16514 * should be overriden by subclasses to provide accurate and efficient 16515 * measurement of their contents. 16516 * </p> 16517 * 16518 * <p> 16519 * <strong>CONTRACT:</strong> When overriding this method, you 16520 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 16521 * measured width and height of this view. Failure to do so will trigger an 16522 * <code>IllegalStateException</code>, thrown by 16523 * {@link #measure(int, int)}. Calling the superclass' 16524 * {@link #onMeasure(int, int)} is a valid use. 16525 * </p> 16526 * 16527 * <p> 16528 * The base class implementation of measure defaults to the background size, 16529 * unless a larger size is allowed by the MeasureSpec. Subclasses should 16530 * override {@link #onMeasure(int, int)} to provide better measurements of 16531 * their content. 16532 * </p> 16533 * 16534 * <p> 16535 * If this method is overridden, it is the subclass's responsibility to make 16536 * sure the measured height and width are at least the view's minimum height 16537 * and width ({@link #getSuggestedMinimumHeight()} and 16538 * {@link #getSuggestedMinimumWidth()}). 16539 * </p> 16540 * 16541 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 16542 * The requirements are encoded with 16543 * {@link android.view.View.MeasureSpec}. 16544 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 16545 * The requirements are encoded with 16546 * {@link android.view.View.MeasureSpec}. 16547 * 16548 * @see #getMeasuredWidth() 16549 * @see #getMeasuredHeight() 16550 * @see #setMeasuredDimension(int, int) 16551 * @see #getSuggestedMinimumHeight() 16552 * @see #getSuggestedMinimumWidth() 16553 * @see android.view.View.MeasureSpec#getMode(int) 16554 * @see android.view.View.MeasureSpec#getSize(int) 16555 */ 16556 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 16557 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 16558 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 16559 } 16560 16561 /** 16562 * <p>This method must be called by {@link #onMeasure(int, int)} to store the 16563 * measured width and measured height. Failing to do so will trigger an 16564 * exception at measurement time.</p> 16565 * 16566 * @param measuredWidth The measured width of this view. May be a complex 16567 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 16568 * {@link #MEASURED_STATE_TOO_SMALL}. 16569 * @param measuredHeight The measured height of this view. May be a complex 16570 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 16571 * {@link #MEASURED_STATE_TOO_SMALL}. 16572 */ 16573 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 16574 boolean optical = isLayoutModeOptical(this); 16575 if (optical != isLayoutModeOptical(mParent)) { 16576 Insets insets = getOpticalInsets(); 16577 int opticalWidth = insets.left + insets.right; 16578 int opticalHeight = insets.top + insets.bottom; 16579 16580 measuredWidth += optical ? opticalWidth : -opticalWidth; 16581 measuredHeight += optical ? opticalHeight : -opticalHeight; 16582 } 16583 mMeasuredWidth = measuredWidth; 16584 mMeasuredHeight = measuredHeight; 16585 16586 mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET; 16587 } 16588 16589 /** 16590 * Merge two states as returned by {@link #getMeasuredState()}. 16591 * @param curState The current state as returned from a view or the result 16592 * of combining multiple views. 16593 * @param newState The new view state to combine. 16594 * @return Returns a new integer reflecting the combination of the two 16595 * states. 16596 */ 16597 public static int combineMeasuredStates(int curState, int newState) { 16598 return curState | newState; 16599 } 16600 16601 /** 16602 * Version of {@link #resolveSizeAndState(int, int, int)} 16603 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 16604 */ 16605 public static int resolveSize(int size, int measureSpec) { 16606 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 16607 } 16608 16609 /** 16610 * Utility to reconcile a desired size and state, with constraints imposed 16611 * by a MeasureSpec. Will take the desired size, unless a different size 16612 * is imposed by the constraints. The returned value is a compound integer, 16613 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 16614 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 16615 * size is smaller than the size the view wants to be. 16616 * 16617 * @param size How big the view wants to be 16618 * @param measureSpec Constraints imposed by the parent 16619 * @return Size information bit mask as defined by 16620 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 16621 */ 16622 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 16623 int result = size; 16624 int specMode = MeasureSpec.getMode(measureSpec); 16625 int specSize = MeasureSpec.getSize(measureSpec); 16626 switch (specMode) { 16627 case MeasureSpec.UNSPECIFIED: 16628 result = size; 16629 break; 16630 case MeasureSpec.AT_MOST: 16631 if (specSize < size) { 16632 result = specSize | MEASURED_STATE_TOO_SMALL; 16633 } else { 16634 result = size; 16635 } 16636 break; 16637 case MeasureSpec.EXACTLY: 16638 result = specSize; 16639 break; 16640 } 16641 return result | (childMeasuredState&MEASURED_STATE_MASK); 16642 } 16643 16644 /** 16645 * Utility to return a default size. Uses the supplied size if the 16646 * MeasureSpec imposed no constraints. Will get larger if allowed 16647 * by the MeasureSpec. 16648 * 16649 * @param size Default size for this view 16650 * @param measureSpec Constraints imposed by the parent 16651 * @return The size this view should be. 16652 */ 16653 public static int getDefaultSize(int size, int measureSpec) { 16654 int result = size; 16655 int specMode = MeasureSpec.getMode(measureSpec); 16656 int specSize = MeasureSpec.getSize(measureSpec); 16657 16658 switch (specMode) { 16659 case MeasureSpec.UNSPECIFIED: 16660 result = size; 16661 break; 16662 case MeasureSpec.AT_MOST: 16663 case MeasureSpec.EXACTLY: 16664 result = specSize; 16665 break; 16666 } 16667 return result; 16668 } 16669 16670 /** 16671 * Returns the suggested minimum height that the view should use. This 16672 * returns the maximum of the view's minimum height 16673 * and the background's minimum height 16674 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 16675 * <p> 16676 * When being used in {@link #onMeasure(int, int)}, the caller should still 16677 * ensure the returned height is within the requirements of the parent. 16678 * 16679 * @return The suggested minimum height of the view. 16680 */ 16681 protected int getSuggestedMinimumHeight() { 16682 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 16683 16684 } 16685 16686 /** 16687 * Returns the suggested minimum width that the view should use. This 16688 * returns the maximum of the view's minimum width) 16689 * and the background's minimum width 16690 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 16691 * <p> 16692 * When being used in {@link #onMeasure(int, int)}, the caller should still 16693 * ensure the returned width is within the requirements of the parent. 16694 * 16695 * @return The suggested minimum width of the view. 16696 */ 16697 protected int getSuggestedMinimumWidth() { 16698 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 16699 } 16700 16701 /** 16702 * Returns the minimum height of the view. 16703 * 16704 * @return the minimum height the view will try to be. 16705 * 16706 * @see #setMinimumHeight(int) 16707 * 16708 * @attr ref android.R.styleable#View_minHeight 16709 */ 16710 public int getMinimumHeight() { 16711 return mMinHeight; 16712 } 16713 16714 /** 16715 * Sets the minimum height of the view. It is not guaranteed the view will 16716 * be able to achieve this minimum height (for example, if its parent layout 16717 * constrains it with less available height). 16718 * 16719 * @param minHeight The minimum height the view will try to be. 16720 * 16721 * @see #getMinimumHeight() 16722 * 16723 * @attr ref android.R.styleable#View_minHeight 16724 */ 16725 public void setMinimumHeight(int minHeight) { 16726 mMinHeight = minHeight; 16727 requestLayout(); 16728 } 16729 16730 /** 16731 * Returns the minimum width of the view. 16732 * 16733 * @return the minimum width the view will try to be. 16734 * 16735 * @see #setMinimumWidth(int) 16736 * 16737 * @attr ref android.R.styleable#View_minWidth 16738 */ 16739 public int getMinimumWidth() { 16740 return mMinWidth; 16741 } 16742 16743 /** 16744 * Sets the minimum width of the view. It is not guaranteed the view will 16745 * be able to achieve this minimum width (for example, if its parent layout 16746 * constrains it with less available width). 16747 * 16748 * @param minWidth The minimum width the view will try to be. 16749 * 16750 * @see #getMinimumWidth() 16751 * 16752 * @attr ref android.R.styleable#View_minWidth 16753 */ 16754 public void setMinimumWidth(int minWidth) { 16755 mMinWidth = minWidth; 16756 requestLayout(); 16757 16758 } 16759 16760 /** 16761 * Get the animation currently associated with this view. 16762 * 16763 * @return The animation that is currently playing or 16764 * scheduled to play for this view. 16765 */ 16766 public Animation getAnimation() { 16767 return mCurrentAnimation; 16768 } 16769 16770 /** 16771 * Start the specified animation now. 16772 * 16773 * @param animation the animation to start now 16774 */ 16775 public void startAnimation(Animation animation) { 16776 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 16777 setAnimation(animation); 16778 invalidateParentCaches(); 16779 invalidate(true); 16780 } 16781 16782 /** 16783 * Cancels any animations for this view. 16784 */ 16785 public void clearAnimation() { 16786 if (mCurrentAnimation != null) { 16787 mCurrentAnimation.detach(); 16788 } 16789 mCurrentAnimation = null; 16790 invalidateParentIfNeeded(); 16791 } 16792 16793 /** 16794 * Sets the next animation to play for this view. 16795 * If you want the animation to play immediately, use 16796 * {@link #startAnimation(android.view.animation.Animation)} instead. 16797 * This method provides allows fine-grained 16798 * control over the start time and invalidation, but you 16799 * must make sure that 1) the animation has a start time set, and 16800 * 2) the view's parent (which controls animations on its children) 16801 * will be invalidated when the animation is supposed to 16802 * start. 16803 * 16804 * @param animation The next animation, or null. 16805 */ 16806 public void setAnimation(Animation animation) { 16807 mCurrentAnimation = animation; 16808 16809 if (animation != null) { 16810 // If the screen is off assume the animation start time is now instead of 16811 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 16812 // would cause the animation to start when the screen turns back on 16813 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 16814 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 16815 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 16816 } 16817 animation.reset(); 16818 } 16819 } 16820 16821 /** 16822 * Invoked by a parent ViewGroup to notify the start of the animation 16823 * currently associated with this view. If you override this method, 16824 * always call super.onAnimationStart(); 16825 * 16826 * @see #setAnimation(android.view.animation.Animation) 16827 * @see #getAnimation() 16828 */ 16829 protected void onAnimationStart() { 16830 mPrivateFlags |= PFLAG_ANIMATION_STARTED; 16831 } 16832 16833 /** 16834 * Invoked by a parent ViewGroup to notify the end of the animation 16835 * currently associated with this view. If you override this method, 16836 * always call super.onAnimationEnd(); 16837 * 16838 * @see #setAnimation(android.view.animation.Animation) 16839 * @see #getAnimation() 16840 */ 16841 protected void onAnimationEnd() { 16842 mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 16843 } 16844 16845 /** 16846 * Invoked if there is a Transform that involves alpha. Subclass that can 16847 * draw themselves with the specified alpha should return true, and then 16848 * respect that alpha when their onDraw() is called. If this returns false 16849 * then the view may be redirected to draw into an offscreen buffer to 16850 * fulfill the request, which will look fine, but may be slower than if the 16851 * subclass handles it internally. The default implementation returns false. 16852 * 16853 * @param alpha The alpha (0..255) to apply to the view's drawing 16854 * @return true if the view can draw with the specified alpha. 16855 */ 16856 protected boolean onSetAlpha(int alpha) { 16857 return false; 16858 } 16859 16860 /** 16861 * This is used by the RootView to perform an optimization when 16862 * the view hierarchy contains one or several SurfaceView. 16863 * SurfaceView is always considered transparent, but its children are not, 16864 * therefore all View objects remove themselves from the global transparent 16865 * region (passed as a parameter to this function). 16866 * 16867 * @param region The transparent region for this ViewAncestor (window). 16868 * 16869 * @return Returns true if the effective visibility of the view at this 16870 * point is opaque, regardless of the transparent region; returns false 16871 * if it is possible for underlying windows to be seen behind the view. 16872 * 16873 * {@hide} 16874 */ 16875 public boolean gatherTransparentRegion(Region region) { 16876 final AttachInfo attachInfo = mAttachInfo; 16877 if (region != null && attachInfo != null) { 16878 final int pflags = mPrivateFlags; 16879 if ((pflags & PFLAG_SKIP_DRAW) == 0) { 16880 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 16881 // remove it from the transparent region. 16882 final int[] location = attachInfo.mTransparentLocation; 16883 getLocationInWindow(location); 16884 region.op(location[0], location[1], location[0] + mRight - mLeft, 16885 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 16886 } else if ((pflags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 16887 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 16888 // exists, so we remove the background drawable's non-transparent 16889 // parts from this transparent region. 16890 applyDrawableToTransparentRegion(mBackground, region); 16891 } 16892 } 16893 return true; 16894 } 16895 16896 /** 16897 * Play a sound effect for this view. 16898 * 16899 * <p>The framework will play sound effects for some built in actions, such as 16900 * clicking, but you may wish to play these effects in your widget, 16901 * for instance, for internal navigation. 16902 * 16903 * <p>The sound effect will only be played if sound effects are enabled by the user, and 16904 * {@link #isSoundEffectsEnabled()} is true. 16905 * 16906 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 16907 */ 16908 public void playSoundEffect(int soundConstant) { 16909 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 16910 return; 16911 } 16912 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 16913 } 16914 16915 /** 16916 * BZZZTT!!1! 16917 * 16918 * <p>Provide haptic feedback to the user for this view. 16919 * 16920 * <p>The framework will provide haptic feedback for some built in actions, 16921 * such as long presses, but you may wish to provide feedback for your 16922 * own widget. 16923 * 16924 * <p>The feedback will only be performed if 16925 * {@link #isHapticFeedbackEnabled()} is true. 16926 * 16927 * @param feedbackConstant One of the constants defined in 16928 * {@link HapticFeedbackConstants} 16929 */ 16930 public boolean performHapticFeedback(int feedbackConstant) { 16931 return performHapticFeedback(feedbackConstant, 0); 16932 } 16933 16934 /** 16935 * BZZZTT!!1! 16936 * 16937 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 16938 * 16939 * @param feedbackConstant One of the constants defined in 16940 * {@link HapticFeedbackConstants} 16941 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 16942 */ 16943 public boolean performHapticFeedback(int feedbackConstant, int flags) { 16944 if (mAttachInfo == null) { 16945 return false; 16946 } 16947 //noinspection SimplifiableIfStatement 16948 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 16949 && !isHapticFeedbackEnabled()) { 16950 return false; 16951 } 16952 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 16953 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 16954 } 16955 16956 /** 16957 * Request that the visibility of the status bar or other screen/window 16958 * decorations be changed. 16959 * 16960 * <p>This method is used to put the over device UI into temporary modes 16961 * where the user's attention is focused more on the application content, 16962 * by dimming or hiding surrounding system affordances. This is typically 16963 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 16964 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 16965 * to be placed behind the action bar (and with these flags other system 16966 * affordances) so that smooth transitions between hiding and showing them 16967 * can be done. 16968 * 16969 * <p>Two representative examples of the use of system UI visibility is 16970 * implementing a content browsing application (like a magazine reader) 16971 * and a video playing application. 16972 * 16973 * <p>The first code shows a typical implementation of a View in a content 16974 * browsing application. In this implementation, the application goes 16975 * into a content-oriented mode by hiding the status bar and action bar, 16976 * and putting the navigation elements into lights out mode. The user can 16977 * then interact with content while in this mode. Such an application should 16978 * provide an easy way for the user to toggle out of the mode (such as to 16979 * check information in the status bar or access notifications). In the 16980 * implementation here, this is done simply by tapping on the content. 16981 * 16982 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 16983 * content} 16984 * 16985 * <p>This second code sample shows a typical implementation of a View 16986 * in a video playing application. In this situation, while the video is 16987 * playing the application would like to go into a complete full-screen mode, 16988 * to use as much of the display as possible for the video. When in this state 16989 * the user can not interact with the application; the system intercepts 16990 * touching on the screen to pop the UI out of full screen mode. See 16991 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 16992 * 16993 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 16994 * content} 16995 * 16996 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16997 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16998 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16999 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_IMMERSIVE}, 17000 * and {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY}. 17001 */ 17002 public void setSystemUiVisibility(int visibility) { 17003 if (visibility != mSystemUiVisibility) { 17004 mSystemUiVisibility = visibility; 17005 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 17006 mParent.recomputeViewAttributes(this); 17007 } 17008 } 17009 } 17010 17011 /** 17012 * Returns the last {@link #setSystemUiVisibility(int)} that this view has requested. 17013 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 17014 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 17015 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 17016 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_IMMERSIVE}, 17017 * and {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY}. 17018 */ 17019 public int getSystemUiVisibility() { 17020 return mSystemUiVisibility; 17021 } 17022 17023 /** 17024 * Returns the current system UI visibility that is currently set for 17025 * the entire window. This is the combination of the 17026 * {@link #setSystemUiVisibility(int)} values supplied by all of the 17027 * views in the window. 17028 */ 17029 public int getWindowSystemUiVisibility() { 17030 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 17031 } 17032 17033 /** 17034 * Override to find out when the window's requested system UI visibility 17035 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 17036 * This is different from the callbacks received through 17037 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 17038 * in that this is only telling you about the local request of the window, 17039 * not the actual values applied by the system. 17040 */ 17041 public void onWindowSystemUiVisibilityChanged(int visible) { 17042 } 17043 17044 /** 17045 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 17046 * the view hierarchy. 17047 */ 17048 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 17049 onWindowSystemUiVisibilityChanged(visible); 17050 } 17051 17052 /** 17053 * Set a listener to receive callbacks when the visibility of the system bar changes. 17054 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 17055 */ 17056 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 17057 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 17058 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 17059 mParent.recomputeViewAttributes(this); 17060 } 17061 } 17062 17063 /** 17064 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 17065 * the view hierarchy. 17066 */ 17067 public void dispatchSystemUiVisibilityChanged(int visibility) { 17068 ListenerInfo li = mListenerInfo; 17069 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 17070 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 17071 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 17072 } 17073 } 17074 17075 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 17076 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 17077 if (val != mSystemUiVisibility) { 17078 setSystemUiVisibility(val); 17079 return true; 17080 } 17081 return false; 17082 } 17083 17084 /** @hide */ 17085 public void setDisabledSystemUiVisibility(int flags) { 17086 if (mAttachInfo != null) { 17087 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 17088 mAttachInfo.mDisabledSystemUiVisibility = flags; 17089 if (mParent != null) { 17090 mParent.recomputeViewAttributes(this); 17091 } 17092 } 17093 } 17094 } 17095 17096 /** 17097 * Creates an image that the system displays during the drag and drop 17098 * operation. This is called a "drag shadow". The default implementation 17099 * for a DragShadowBuilder based on a View returns an image that has exactly the same 17100 * appearance as the given View. The default also positions the center of the drag shadow 17101 * directly under the touch point. If no View is provided (the constructor with no parameters 17102 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 17103 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 17104 * default is an invisible drag shadow. 17105 * <p> 17106 * You are not required to use the View you provide to the constructor as the basis of the 17107 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 17108 * anything you want as the drag shadow. 17109 * </p> 17110 * <p> 17111 * You pass a DragShadowBuilder object to the system when you start the drag. The system 17112 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 17113 * size and position of the drag shadow. It uses this data to construct a 17114 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 17115 * so that your application can draw the shadow image in the Canvas. 17116 * </p> 17117 * 17118 * <div class="special reference"> 17119 * <h3>Developer Guides</h3> 17120 * <p>For a guide to implementing drag and drop features, read the 17121 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 17122 * </div> 17123 */ 17124 public static class DragShadowBuilder { 17125 private final WeakReference<View> mView; 17126 17127 /** 17128 * Constructs a shadow image builder based on a View. By default, the resulting drag 17129 * shadow will have the same appearance and dimensions as the View, with the touch point 17130 * over the center of the View. 17131 * @param view A View. Any View in scope can be used. 17132 */ 17133 public DragShadowBuilder(View view) { 17134 mView = new WeakReference<View>(view); 17135 } 17136 17137 /** 17138 * Construct a shadow builder object with no associated View. This 17139 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 17140 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 17141 * to supply the drag shadow's dimensions and appearance without 17142 * reference to any View object. If they are not overridden, then the result is an 17143 * invisible drag shadow. 17144 */ 17145 public DragShadowBuilder() { 17146 mView = new WeakReference<View>(null); 17147 } 17148 17149 /** 17150 * Returns the View object that had been passed to the 17151 * {@link #View.DragShadowBuilder(View)} 17152 * constructor. If that View parameter was {@code null} or if the 17153 * {@link #View.DragShadowBuilder()} 17154 * constructor was used to instantiate the builder object, this method will return 17155 * null. 17156 * 17157 * @return The View object associate with this builder object. 17158 */ 17159 @SuppressWarnings({"JavadocReference"}) 17160 final public View getView() { 17161 return mView.get(); 17162 } 17163 17164 /** 17165 * Provides the metrics for the shadow image. These include the dimensions of 17166 * the shadow image, and the point within that shadow that should 17167 * be centered under the touch location while dragging. 17168 * <p> 17169 * The default implementation sets the dimensions of the shadow to be the 17170 * same as the dimensions of the View itself and centers the shadow under 17171 * the touch point. 17172 * </p> 17173 * 17174 * @param shadowSize A {@link android.graphics.Point} containing the width and height 17175 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 17176 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 17177 * image. 17178 * 17179 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 17180 * shadow image that should be underneath the touch point during the drag and drop 17181 * operation. Your application must set {@link android.graphics.Point#x} to the 17182 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 17183 */ 17184 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 17185 final View view = mView.get(); 17186 if (view != null) { 17187 shadowSize.set(view.getWidth(), view.getHeight()); 17188 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 17189 } else { 17190 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 17191 } 17192 } 17193 17194 /** 17195 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 17196 * based on the dimensions it received from the 17197 * {@link #onProvideShadowMetrics(Point, Point)} callback. 17198 * 17199 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 17200 */ 17201 public void onDrawShadow(Canvas canvas) { 17202 final View view = mView.get(); 17203 if (view != null) { 17204 view.draw(canvas); 17205 } else { 17206 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 17207 } 17208 } 17209 } 17210 17211 /** 17212 * Starts a drag and drop operation. When your application calls this method, it passes a 17213 * {@link android.view.View.DragShadowBuilder} object to the system. The 17214 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 17215 * to get metrics for the drag shadow, and then calls the object's 17216 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 17217 * <p> 17218 * Once the system has the drag shadow, it begins the drag and drop operation by sending 17219 * drag events to all the View objects in your application that are currently visible. It does 17220 * this either by calling the View object's drag listener (an implementation of 17221 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 17222 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 17223 * Both are passed a {@link android.view.DragEvent} object that has a 17224 * {@link android.view.DragEvent#getAction()} value of 17225 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 17226 * </p> 17227 * <p> 17228 * Your application can invoke startDrag() on any attached View object. The View object does not 17229 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 17230 * be related to the View the user selected for dragging. 17231 * </p> 17232 * @param data A {@link android.content.ClipData} object pointing to the data to be 17233 * transferred by the drag and drop operation. 17234 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 17235 * drag shadow. 17236 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 17237 * drop operation. This Object is put into every DragEvent object sent by the system during the 17238 * current drag. 17239 * <p> 17240 * myLocalState is a lightweight mechanism for the sending information from the dragged View 17241 * to the target Views. For example, it can contain flags that differentiate between a 17242 * a copy operation and a move operation. 17243 * </p> 17244 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 17245 * so the parameter should be set to 0. 17246 * @return {@code true} if the method completes successfully, or 17247 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 17248 * do a drag, and so no drag operation is in progress. 17249 */ 17250 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 17251 Object myLocalState, int flags) { 17252 if (ViewDebug.DEBUG_DRAG) { 17253 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 17254 } 17255 boolean okay = false; 17256 17257 Point shadowSize = new Point(); 17258 Point shadowTouchPoint = new Point(); 17259 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 17260 17261 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 17262 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 17263 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 17264 } 17265 17266 if (ViewDebug.DEBUG_DRAG) { 17267 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 17268 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 17269 } 17270 Surface surface = new Surface(); 17271 try { 17272 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 17273 flags, shadowSize.x, shadowSize.y, surface); 17274 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 17275 + " surface=" + surface); 17276 if (token != null) { 17277 Canvas canvas = surface.lockCanvas(null); 17278 try { 17279 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 17280 shadowBuilder.onDrawShadow(canvas); 17281 } finally { 17282 surface.unlockCanvasAndPost(canvas); 17283 } 17284 17285 final ViewRootImpl root = getViewRootImpl(); 17286 17287 // Cache the local state object for delivery with DragEvents 17288 root.setLocalDragState(myLocalState); 17289 17290 // repurpose 'shadowSize' for the last touch point 17291 root.getLastTouchPoint(shadowSize); 17292 17293 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 17294 shadowSize.x, shadowSize.y, 17295 shadowTouchPoint.x, shadowTouchPoint.y, data); 17296 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 17297 17298 // Off and running! Release our local surface instance; the drag 17299 // shadow surface is now managed by the system process. 17300 surface.release(); 17301 } 17302 } catch (Exception e) { 17303 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 17304 surface.destroy(); 17305 } 17306 17307 return okay; 17308 } 17309 17310 /** 17311 * Handles drag events sent by the system following a call to 17312 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 17313 *<p> 17314 * When the system calls this method, it passes a 17315 * {@link android.view.DragEvent} object. A call to 17316 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 17317 * in DragEvent. The method uses these to determine what is happening in the drag and drop 17318 * operation. 17319 * @param event The {@link android.view.DragEvent} sent by the system. 17320 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 17321 * in DragEvent, indicating the type of drag event represented by this object. 17322 * @return {@code true} if the method was successful, otherwise {@code false}. 17323 * <p> 17324 * The method should return {@code true} in response to an action type of 17325 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 17326 * operation. 17327 * </p> 17328 * <p> 17329 * The method should also return {@code true} in response to an action type of 17330 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 17331 * {@code false} if it didn't. 17332 * </p> 17333 */ 17334 public boolean onDragEvent(DragEvent event) { 17335 return false; 17336 } 17337 17338 /** 17339 * Detects if this View is enabled and has a drag event listener. 17340 * If both are true, then it calls the drag event listener with the 17341 * {@link android.view.DragEvent} it received. If the drag event listener returns 17342 * {@code true}, then dispatchDragEvent() returns {@code true}. 17343 * <p> 17344 * For all other cases, the method calls the 17345 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 17346 * method and returns its result. 17347 * </p> 17348 * <p> 17349 * This ensures that a drag event is always consumed, even if the View does not have a drag 17350 * event listener. However, if the View has a listener and the listener returns true, then 17351 * onDragEvent() is not called. 17352 * </p> 17353 */ 17354 public boolean dispatchDragEvent(DragEvent event) { 17355 ListenerInfo li = mListenerInfo; 17356 //noinspection SimplifiableIfStatement 17357 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 17358 && li.mOnDragListener.onDrag(this, event)) { 17359 return true; 17360 } 17361 return onDragEvent(event); 17362 } 17363 17364 boolean canAcceptDrag() { 17365 return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0; 17366 } 17367 17368 /** 17369 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 17370 * it is ever exposed at all. 17371 * @hide 17372 */ 17373 public void onCloseSystemDialogs(String reason) { 17374 } 17375 17376 /** 17377 * Given a Drawable whose bounds have been set to draw into this view, 17378 * update a Region being computed for 17379 * {@link #gatherTransparentRegion(android.graphics.Region)} so 17380 * that any non-transparent parts of the Drawable are removed from the 17381 * given transparent region. 17382 * 17383 * @param dr The Drawable whose transparency is to be applied to the region. 17384 * @param region A Region holding the current transparency information, 17385 * where any parts of the region that are set are considered to be 17386 * transparent. On return, this region will be modified to have the 17387 * transparency information reduced by the corresponding parts of the 17388 * Drawable that are not transparent. 17389 * {@hide} 17390 */ 17391 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 17392 if (DBG) { 17393 Log.i("View", "Getting transparent region for: " + this); 17394 } 17395 final Region r = dr.getTransparentRegion(); 17396 final Rect db = dr.getBounds(); 17397 final AttachInfo attachInfo = mAttachInfo; 17398 if (r != null && attachInfo != null) { 17399 final int w = getRight()-getLeft(); 17400 final int h = getBottom()-getTop(); 17401 if (db.left > 0) { 17402 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 17403 r.op(0, 0, db.left, h, Region.Op.UNION); 17404 } 17405 if (db.right < w) { 17406 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 17407 r.op(db.right, 0, w, h, Region.Op.UNION); 17408 } 17409 if (db.top > 0) { 17410 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 17411 r.op(0, 0, w, db.top, Region.Op.UNION); 17412 } 17413 if (db.bottom < h) { 17414 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 17415 r.op(0, db.bottom, w, h, Region.Op.UNION); 17416 } 17417 final int[] location = attachInfo.mTransparentLocation; 17418 getLocationInWindow(location); 17419 r.translate(location[0], location[1]); 17420 region.op(r, Region.Op.INTERSECT); 17421 } else { 17422 region.op(db, Region.Op.DIFFERENCE); 17423 } 17424 } 17425 17426 private void checkForLongClick(int delayOffset) { 17427 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 17428 mHasPerformedLongPress = false; 17429 17430 if (mPendingCheckForLongPress == null) { 17431 mPendingCheckForLongPress = new CheckForLongPress(); 17432 } 17433 mPendingCheckForLongPress.rememberWindowAttachCount(); 17434 postDelayed(mPendingCheckForLongPress, 17435 ViewConfiguration.getLongPressTimeout() - delayOffset); 17436 } 17437 } 17438 17439 /** 17440 * Inflate a view from an XML resource. This convenience method wraps the {@link 17441 * LayoutInflater} class, which provides a full range of options for view inflation. 17442 * 17443 * @param context The Context object for your activity or application. 17444 * @param resource The resource ID to inflate 17445 * @param root A view group that will be the parent. Used to properly inflate the 17446 * layout_* parameters. 17447 * @see LayoutInflater 17448 */ 17449 public static View inflate(Context context, int resource, ViewGroup root) { 17450 LayoutInflater factory = LayoutInflater.from(context); 17451 return factory.inflate(resource, root); 17452 } 17453 17454 /** 17455 * Scroll the view with standard behavior for scrolling beyond the normal 17456 * content boundaries. Views that call this method should override 17457 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 17458 * results of an over-scroll operation. 17459 * 17460 * Views can use this method to handle any touch or fling-based scrolling. 17461 * 17462 * @param deltaX Change in X in pixels 17463 * @param deltaY Change in Y in pixels 17464 * @param scrollX Current X scroll value in pixels before applying deltaX 17465 * @param scrollY Current Y scroll value in pixels before applying deltaY 17466 * @param scrollRangeX Maximum content scroll range along the X axis 17467 * @param scrollRangeY Maximum content scroll range along the Y axis 17468 * @param maxOverScrollX Number of pixels to overscroll by in either direction 17469 * along the X axis. 17470 * @param maxOverScrollY Number of pixels to overscroll by in either direction 17471 * along the Y axis. 17472 * @param isTouchEvent true if this scroll operation is the result of a touch event. 17473 * @return true if scrolling was clamped to an over-scroll boundary along either 17474 * axis, false otherwise. 17475 */ 17476 @SuppressWarnings({"UnusedParameters"}) 17477 protected boolean overScrollBy(int deltaX, int deltaY, 17478 int scrollX, int scrollY, 17479 int scrollRangeX, int scrollRangeY, 17480 int maxOverScrollX, int maxOverScrollY, 17481 boolean isTouchEvent) { 17482 final int overScrollMode = mOverScrollMode; 17483 final boolean canScrollHorizontal = 17484 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 17485 final boolean canScrollVertical = 17486 computeVerticalScrollRange() > computeVerticalScrollExtent(); 17487 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 17488 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 17489 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 17490 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 17491 17492 int newScrollX = scrollX + deltaX; 17493 if (!overScrollHorizontal) { 17494 maxOverScrollX = 0; 17495 } 17496 17497 int newScrollY = scrollY + deltaY; 17498 if (!overScrollVertical) { 17499 maxOverScrollY = 0; 17500 } 17501 17502 // Clamp values if at the limits and record 17503 final int left = -maxOverScrollX; 17504 final int right = maxOverScrollX + scrollRangeX; 17505 final int top = -maxOverScrollY; 17506 final int bottom = maxOverScrollY + scrollRangeY; 17507 17508 boolean clampedX = false; 17509 if (newScrollX > right) { 17510 newScrollX = right; 17511 clampedX = true; 17512 } else if (newScrollX < left) { 17513 newScrollX = left; 17514 clampedX = true; 17515 } 17516 17517 boolean clampedY = false; 17518 if (newScrollY > bottom) { 17519 newScrollY = bottom; 17520 clampedY = true; 17521 } else if (newScrollY < top) { 17522 newScrollY = top; 17523 clampedY = true; 17524 } 17525 17526 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 17527 17528 return clampedX || clampedY; 17529 } 17530 17531 /** 17532 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 17533 * respond to the results of an over-scroll operation. 17534 * 17535 * @param scrollX New X scroll value in pixels 17536 * @param scrollY New Y scroll value in pixels 17537 * @param clampedX True if scrollX was clamped to an over-scroll boundary 17538 * @param clampedY True if scrollY was clamped to an over-scroll boundary 17539 */ 17540 protected void onOverScrolled(int scrollX, int scrollY, 17541 boolean clampedX, boolean clampedY) { 17542 // Intentionally empty. 17543 } 17544 17545 /** 17546 * Returns the over-scroll mode for this view. The result will be 17547 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 17548 * (allow over-scrolling only if the view content is larger than the container), 17549 * or {@link #OVER_SCROLL_NEVER}. 17550 * 17551 * @return This view's over-scroll mode. 17552 */ 17553 public int getOverScrollMode() { 17554 return mOverScrollMode; 17555 } 17556 17557 /** 17558 * Set the over-scroll mode for this view. Valid over-scroll modes are 17559 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 17560 * (allow over-scrolling only if the view content is larger than the container), 17561 * or {@link #OVER_SCROLL_NEVER}. 17562 * 17563 * Setting the over-scroll mode of a view will have an effect only if the 17564 * view is capable of scrolling. 17565 * 17566 * @param overScrollMode The new over-scroll mode for this view. 17567 */ 17568 public void setOverScrollMode(int overScrollMode) { 17569 if (overScrollMode != OVER_SCROLL_ALWAYS && 17570 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 17571 overScrollMode != OVER_SCROLL_NEVER) { 17572 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 17573 } 17574 mOverScrollMode = overScrollMode; 17575 } 17576 17577 /** 17578 * Gets a scale factor that determines the distance the view should scroll 17579 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 17580 * @return The vertical scroll scale factor. 17581 * @hide 17582 */ 17583 protected float getVerticalScrollFactor() { 17584 if (mVerticalScrollFactor == 0) { 17585 TypedValue outValue = new TypedValue(); 17586 if (!mContext.getTheme().resolveAttribute( 17587 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 17588 throw new IllegalStateException( 17589 "Expected theme to define listPreferredItemHeight."); 17590 } 17591 mVerticalScrollFactor = outValue.getDimension( 17592 mContext.getResources().getDisplayMetrics()); 17593 } 17594 return mVerticalScrollFactor; 17595 } 17596 17597 /** 17598 * Gets a scale factor that determines the distance the view should scroll 17599 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 17600 * @return The horizontal scroll scale factor. 17601 * @hide 17602 */ 17603 protected float getHorizontalScrollFactor() { 17604 // TODO: Should use something else. 17605 return getVerticalScrollFactor(); 17606 } 17607 17608 /** 17609 * Return the value specifying the text direction or policy that was set with 17610 * {@link #setTextDirection(int)}. 17611 * 17612 * @return the defined text direction. It can be one of: 17613 * 17614 * {@link #TEXT_DIRECTION_INHERIT}, 17615 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17616 * {@link #TEXT_DIRECTION_ANY_RTL}, 17617 * {@link #TEXT_DIRECTION_LTR}, 17618 * {@link #TEXT_DIRECTION_RTL}, 17619 * {@link #TEXT_DIRECTION_LOCALE} 17620 * 17621 * @attr ref android.R.styleable#View_textDirection 17622 * 17623 * @hide 17624 */ 17625 @ViewDebug.ExportedProperty(category = "text", mapping = { 17626 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 17627 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 17628 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 17629 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 17630 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 17631 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 17632 }) 17633 public int getRawTextDirection() { 17634 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 17635 } 17636 17637 /** 17638 * Set the text direction. 17639 * 17640 * @param textDirection the direction to set. Should be one of: 17641 * 17642 * {@link #TEXT_DIRECTION_INHERIT}, 17643 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17644 * {@link #TEXT_DIRECTION_ANY_RTL}, 17645 * {@link #TEXT_DIRECTION_LTR}, 17646 * {@link #TEXT_DIRECTION_RTL}, 17647 * {@link #TEXT_DIRECTION_LOCALE} 17648 * 17649 * Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution 17650 * proceeds up the parent chain of the view to get the value. If there is no parent, then it will 17651 * return the default {@link #TEXT_DIRECTION_FIRST_STRONG}. 17652 * 17653 * @attr ref android.R.styleable#View_textDirection 17654 */ 17655 public void setTextDirection(int textDirection) { 17656 if (getRawTextDirection() != textDirection) { 17657 // Reset the current text direction and the resolved one 17658 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 17659 resetResolvedTextDirection(); 17660 // Set the new text direction 17661 mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK); 17662 // Do resolution 17663 resolveTextDirection(); 17664 // Notify change 17665 onRtlPropertiesChanged(getLayoutDirection()); 17666 // Refresh 17667 requestLayout(); 17668 invalidate(true); 17669 } 17670 } 17671 17672 /** 17673 * Return the resolved text direction. 17674 * 17675 * @return the resolved text direction. Returns one of: 17676 * 17677 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17678 * {@link #TEXT_DIRECTION_ANY_RTL}, 17679 * {@link #TEXT_DIRECTION_LTR}, 17680 * {@link #TEXT_DIRECTION_RTL}, 17681 * {@link #TEXT_DIRECTION_LOCALE} 17682 * 17683 * @attr ref android.R.styleable#View_textDirection 17684 */ 17685 @ViewDebug.ExportedProperty(category = "text", mapping = { 17686 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 17687 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 17688 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 17689 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 17690 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 17691 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 17692 }) 17693 public int getTextDirection() { 17694 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 17695 } 17696 17697 /** 17698 * Resolve the text direction. 17699 * 17700 * @return true if resolution has been done, false otherwise. 17701 * 17702 * @hide 17703 */ 17704 public boolean resolveTextDirection() { 17705 // Reset any previous text direction resolution 17706 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17707 17708 if (hasRtlSupport()) { 17709 // Set resolved text direction flag depending on text direction flag 17710 final int textDirection = getRawTextDirection(); 17711 switch(textDirection) { 17712 case TEXT_DIRECTION_INHERIT: 17713 if (!canResolveTextDirection()) { 17714 // We cannot do the resolution if there is no parent, so use the default one 17715 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17716 // Resolution will need to happen again later 17717 return false; 17718 } 17719 17720 // Parent has not yet resolved, so we still return the default 17721 try { 17722 if (!mParent.isTextDirectionResolved()) { 17723 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17724 // Resolution will need to happen again later 17725 return false; 17726 } 17727 } catch (AbstractMethodError e) { 17728 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17729 " does not fully implement ViewParent", e); 17730 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED | 17731 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17732 return true; 17733 } 17734 17735 // Set current resolved direction to the same value as the parent's one 17736 int parentResolvedDirection; 17737 try { 17738 parentResolvedDirection = mParent.getTextDirection(); 17739 } catch (AbstractMethodError e) { 17740 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17741 " does not fully implement ViewParent", e); 17742 parentResolvedDirection = TEXT_DIRECTION_LTR; 17743 } 17744 switch (parentResolvedDirection) { 17745 case TEXT_DIRECTION_FIRST_STRONG: 17746 case TEXT_DIRECTION_ANY_RTL: 17747 case TEXT_DIRECTION_LTR: 17748 case TEXT_DIRECTION_RTL: 17749 case TEXT_DIRECTION_LOCALE: 17750 mPrivateFlags2 |= 17751 (parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17752 break; 17753 default: 17754 // Default resolved direction is "first strong" heuristic 17755 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17756 } 17757 break; 17758 case TEXT_DIRECTION_FIRST_STRONG: 17759 case TEXT_DIRECTION_ANY_RTL: 17760 case TEXT_DIRECTION_LTR: 17761 case TEXT_DIRECTION_RTL: 17762 case TEXT_DIRECTION_LOCALE: 17763 // Resolved direction is the same as text direction 17764 mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17765 break; 17766 default: 17767 // Default resolved direction is "first strong" heuristic 17768 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17769 } 17770 } else { 17771 // Default resolved direction is "first strong" heuristic 17772 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17773 } 17774 17775 // Set to resolved 17776 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED; 17777 return true; 17778 } 17779 17780 /** 17781 * Check if text direction resolution can be done. 17782 * 17783 * @return true if text direction resolution can be done otherwise return false. 17784 */ 17785 public boolean canResolveTextDirection() { 17786 switch (getRawTextDirection()) { 17787 case TEXT_DIRECTION_INHERIT: 17788 if (mParent != null) { 17789 try { 17790 return mParent.canResolveTextDirection(); 17791 } catch (AbstractMethodError e) { 17792 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17793 " does not fully implement ViewParent", e); 17794 } 17795 } 17796 return false; 17797 17798 default: 17799 return true; 17800 } 17801 } 17802 17803 /** 17804 * Reset resolved text direction. Text direction will be resolved during a call to 17805 * {@link #onMeasure(int, int)}. 17806 * 17807 * @hide 17808 */ 17809 public void resetResolvedTextDirection() { 17810 // Reset any previous text direction resolution 17811 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17812 // Set to default value 17813 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17814 } 17815 17816 /** 17817 * @return true if text direction is inherited. 17818 * 17819 * @hide 17820 */ 17821 public boolean isTextDirectionInherited() { 17822 return (getRawTextDirection() == TEXT_DIRECTION_INHERIT); 17823 } 17824 17825 /** 17826 * @return true if text direction is resolved. 17827 */ 17828 public boolean isTextDirectionResolved() { 17829 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED; 17830 } 17831 17832 /** 17833 * Return the value specifying the text alignment or policy that was set with 17834 * {@link #setTextAlignment(int)}. 17835 * 17836 * @return the defined text alignment. It can be one of: 17837 * 17838 * {@link #TEXT_ALIGNMENT_INHERIT}, 17839 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17840 * {@link #TEXT_ALIGNMENT_CENTER}, 17841 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17842 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17843 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17844 * {@link #TEXT_ALIGNMENT_VIEW_END} 17845 * 17846 * @attr ref android.R.styleable#View_textAlignment 17847 * 17848 * @hide 17849 */ 17850 @ViewDebug.ExportedProperty(category = "text", mapping = { 17851 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17852 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17853 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17854 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17855 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17856 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17857 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17858 }) 17859 public int getRawTextAlignment() { 17860 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 17861 } 17862 17863 /** 17864 * Set the text alignment. 17865 * 17866 * @param textAlignment The text alignment to set. Should be one of 17867 * 17868 * {@link #TEXT_ALIGNMENT_INHERIT}, 17869 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17870 * {@link #TEXT_ALIGNMENT_CENTER}, 17871 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17872 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17873 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17874 * {@link #TEXT_ALIGNMENT_VIEW_END} 17875 * 17876 * Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution 17877 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 17878 * will return the default {@link #TEXT_ALIGNMENT_GRAVITY}. 17879 * 17880 * @attr ref android.R.styleable#View_textAlignment 17881 */ 17882 public void setTextAlignment(int textAlignment) { 17883 if (textAlignment != getRawTextAlignment()) { 17884 // Reset the current and resolved text alignment 17885 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 17886 resetResolvedTextAlignment(); 17887 // Set the new text alignment 17888 mPrivateFlags2 |= 17889 ((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK); 17890 // Do resolution 17891 resolveTextAlignment(); 17892 // Notify change 17893 onRtlPropertiesChanged(getLayoutDirection()); 17894 // Refresh 17895 requestLayout(); 17896 invalidate(true); 17897 } 17898 } 17899 17900 /** 17901 * Return the resolved text alignment. 17902 * 17903 * @return the resolved text alignment. Returns one of: 17904 * 17905 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17906 * {@link #TEXT_ALIGNMENT_CENTER}, 17907 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17908 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17909 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17910 * {@link #TEXT_ALIGNMENT_VIEW_END} 17911 * 17912 * @attr ref android.R.styleable#View_textAlignment 17913 */ 17914 @ViewDebug.ExportedProperty(category = "text", mapping = { 17915 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17916 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17917 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17918 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17919 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17920 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17921 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17922 }) 17923 public int getTextAlignment() { 17924 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >> 17925 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 17926 } 17927 17928 /** 17929 * Resolve the text alignment. 17930 * 17931 * @return true if resolution has been done, false otherwise. 17932 * 17933 * @hide 17934 */ 17935 public boolean resolveTextAlignment() { 17936 // Reset any previous text alignment resolution 17937 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17938 17939 if (hasRtlSupport()) { 17940 // Set resolved text alignment flag depending on text alignment flag 17941 final int textAlignment = getRawTextAlignment(); 17942 switch (textAlignment) { 17943 case TEXT_ALIGNMENT_INHERIT: 17944 // Check if we can resolve the text alignment 17945 if (!canResolveTextAlignment()) { 17946 // We cannot do the resolution if there is no parent so use the default 17947 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17948 // Resolution will need to happen again later 17949 return false; 17950 } 17951 17952 // Parent has not yet resolved, so we still return the default 17953 try { 17954 if (!mParent.isTextAlignmentResolved()) { 17955 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17956 // Resolution will need to happen again later 17957 return false; 17958 } 17959 } catch (AbstractMethodError e) { 17960 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17961 " does not fully implement ViewParent", e); 17962 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED | 17963 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17964 return true; 17965 } 17966 17967 int parentResolvedTextAlignment; 17968 try { 17969 parentResolvedTextAlignment = mParent.getTextAlignment(); 17970 } catch (AbstractMethodError e) { 17971 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17972 " does not fully implement ViewParent", e); 17973 parentResolvedTextAlignment = TEXT_ALIGNMENT_GRAVITY; 17974 } 17975 switch (parentResolvedTextAlignment) { 17976 case TEXT_ALIGNMENT_GRAVITY: 17977 case TEXT_ALIGNMENT_TEXT_START: 17978 case TEXT_ALIGNMENT_TEXT_END: 17979 case TEXT_ALIGNMENT_CENTER: 17980 case TEXT_ALIGNMENT_VIEW_START: 17981 case TEXT_ALIGNMENT_VIEW_END: 17982 // Resolved text alignment is the same as the parent resolved 17983 // text alignment 17984 mPrivateFlags2 |= 17985 (parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17986 break; 17987 default: 17988 // Use default resolved text alignment 17989 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17990 } 17991 break; 17992 case TEXT_ALIGNMENT_GRAVITY: 17993 case TEXT_ALIGNMENT_TEXT_START: 17994 case TEXT_ALIGNMENT_TEXT_END: 17995 case TEXT_ALIGNMENT_CENTER: 17996 case TEXT_ALIGNMENT_VIEW_START: 17997 case TEXT_ALIGNMENT_VIEW_END: 17998 // Resolved text alignment is the same as text alignment 17999 mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 18000 break; 18001 default: 18002 // Use default resolved text alignment 18003 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 18004 } 18005 } else { 18006 // Use default resolved text alignment 18007 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 18008 } 18009 18010 // Set the resolved 18011 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED; 18012 return true; 18013 } 18014 18015 /** 18016 * Check if text alignment resolution can be done. 18017 * 18018 * @return true if text alignment resolution can be done otherwise return false. 18019 */ 18020 public boolean canResolveTextAlignment() { 18021 switch (getRawTextAlignment()) { 18022 case TEXT_DIRECTION_INHERIT: 18023 if (mParent != null) { 18024 try { 18025 return mParent.canResolveTextAlignment(); 18026 } catch (AbstractMethodError e) { 18027 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 18028 " does not fully implement ViewParent", e); 18029 } 18030 } 18031 return false; 18032 18033 default: 18034 return true; 18035 } 18036 } 18037 18038 /** 18039 * Reset resolved text alignment. Text alignment will be resolved during a call to 18040 * {@link #onMeasure(int, int)}. 18041 * 18042 * @hide 18043 */ 18044 public void resetResolvedTextAlignment() { 18045 // Reset any previous text alignment resolution 18046 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 18047 // Set to default 18048 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 18049 } 18050 18051 /** 18052 * @return true if text alignment is inherited. 18053 * 18054 * @hide 18055 */ 18056 public boolean isTextAlignmentInherited() { 18057 return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT); 18058 } 18059 18060 /** 18061 * @return true if text alignment is resolved. 18062 */ 18063 public boolean isTextAlignmentResolved() { 18064 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED; 18065 } 18066 18067 /** 18068 * Generate a value suitable for use in {@link #setId(int)}. 18069 * This value will not collide with ID values generated at build time by aapt for R.id. 18070 * 18071 * @return a generated ID value 18072 */ 18073 public static int generateViewId() { 18074 for (;;) { 18075 final int result = sNextGeneratedId.get(); 18076 // aapt-generated IDs have the high byte nonzero; clamp to the range under that. 18077 int newValue = result + 1; 18078 if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. 18079 if (sNextGeneratedId.compareAndSet(result, newValue)) { 18080 return result; 18081 } 18082 } 18083 } 18084 18085 // 18086 // Properties 18087 // 18088 /** 18089 * A Property wrapper around the <code>alpha</code> functionality handled by the 18090 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 18091 */ 18092 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 18093 @Override 18094 public void setValue(View object, float value) { 18095 object.setAlpha(value); 18096 } 18097 18098 @Override 18099 public Float get(View object) { 18100 return object.getAlpha(); 18101 } 18102 }; 18103 18104 /** 18105 * A Property wrapper around the <code>translationX</code> functionality handled by the 18106 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 18107 */ 18108 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 18109 @Override 18110 public void setValue(View object, float value) { 18111 object.setTranslationX(value); 18112 } 18113 18114 @Override 18115 public Float get(View object) { 18116 return object.getTranslationX(); 18117 } 18118 }; 18119 18120 /** 18121 * A Property wrapper around the <code>translationY</code> functionality handled by the 18122 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 18123 */ 18124 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 18125 @Override 18126 public void setValue(View object, float value) { 18127 object.setTranslationY(value); 18128 } 18129 18130 @Override 18131 public Float get(View object) { 18132 return object.getTranslationY(); 18133 } 18134 }; 18135 18136 /** 18137 * A Property wrapper around the <code>x</code> functionality handled by the 18138 * {@link View#setX(float)} and {@link View#getX()} methods. 18139 */ 18140 public static final Property<View, Float> X = new FloatProperty<View>("x") { 18141 @Override 18142 public void setValue(View object, float value) { 18143 object.setX(value); 18144 } 18145 18146 @Override 18147 public Float get(View object) { 18148 return object.getX(); 18149 } 18150 }; 18151 18152 /** 18153 * A Property wrapper around the <code>y</code> functionality handled by the 18154 * {@link View#setY(float)} and {@link View#getY()} methods. 18155 */ 18156 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 18157 @Override 18158 public void setValue(View object, float value) { 18159 object.setY(value); 18160 } 18161 18162 @Override 18163 public Float get(View object) { 18164 return object.getY(); 18165 } 18166 }; 18167 18168 /** 18169 * A Property wrapper around the <code>rotation</code> functionality handled by the 18170 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 18171 */ 18172 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 18173 @Override 18174 public void setValue(View object, float value) { 18175 object.setRotation(value); 18176 } 18177 18178 @Override 18179 public Float get(View object) { 18180 return object.getRotation(); 18181 } 18182 }; 18183 18184 /** 18185 * A Property wrapper around the <code>rotationX</code> functionality handled by the 18186 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 18187 */ 18188 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 18189 @Override 18190 public void setValue(View object, float value) { 18191 object.setRotationX(value); 18192 } 18193 18194 @Override 18195 public Float get(View object) { 18196 return object.getRotationX(); 18197 } 18198 }; 18199 18200 /** 18201 * A Property wrapper around the <code>rotationY</code> functionality handled by the 18202 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 18203 */ 18204 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 18205 @Override 18206 public void setValue(View object, float value) { 18207 object.setRotationY(value); 18208 } 18209 18210 @Override 18211 public Float get(View object) { 18212 return object.getRotationY(); 18213 } 18214 }; 18215 18216 /** 18217 * A Property wrapper around the <code>scaleX</code> functionality handled by the 18218 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 18219 */ 18220 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 18221 @Override 18222 public void setValue(View object, float value) { 18223 object.setScaleX(value); 18224 } 18225 18226 @Override 18227 public Float get(View object) { 18228 return object.getScaleX(); 18229 } 18230 }; 18231 18232 /** 18233 * A Property wrapper around the <code>scaleY</code> functionality handled by the 18234 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 18235 */ 18236 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 18237 @Override 18238 public void setValue(View object, float value) { 18239 object.setScaleY(value); 18240 } 18241 18242 @Override 18243 public Float get(View object) { 18244 return object.getScaleY(); 18245 } 18246 }; 18247 18248 /** 18249 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 18250 * Each MeasureSpec represents a requirement for either the width or the height. 18251 * A MeasureSpec is comprised of a size and a mode. There are three possible 18252 * modes: 18253 * <dl> 18254 * <dt>UNSPECIFIED</dt> 18255 * <dd> 18256 * The parent has not imposed any constraint on the child. It can be whatever size 18257 * it wants. 18258 * </dd> 18259 * 18260 * <dt>EXACTLY</dt> 18261 * <dd> 18262 * The parent has determined an exact size for the child. The child is going to be 18263 * given those bounds regardless of how big it wants to be. 18264 * </dd> 18265 * 18266 * <dt>AT_MOST</dt> 18267 * <dd> 18268 * The child can be as large as it wants up to the specified size. 18269 * </dd> 18270 * </dl> 18271 * 18272 * MeasureSpecs are implemented as ints to reduce object allocation. This class 18273 * is provided to pack and unpack the <size, mode> tuple into the int. 18274 */ 18275 public static class MeasureSpec { 18276 private static final int MODE_SHIFT = 30; 18277 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 18278 18279 /** 18280 * Measure specification mode: The parent has not imposed any constraint 18281 * on the child. It can be whatever size it wants. 18282 */ 18283 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 18284 18285 /** 18286 * Measure specification mode: The parent has determined an exact size 18287 * for the child. The child is going to be given those bounds regardless 18288 * of how big it wants to be. 18289 */ 18290 public static final int EXACTLY = 1 << MODE_SHIFT; 18291 18292 /** 18293 * Measure specification mode: The child can be as large as it wants up 18294 * to the specified size. 18295 */ 18296 public static final int AT_MOST = 2 << MODE_SHIFT; 18297 18298 /** 18299 * Creates a measure specification based on the supplied size and mode. 18300 * 18301 * The mode must always be one of the following: 18302 * <ul> 18303 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 18304 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 18305 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 18306 * </ul> 18307 * 18308 * <p><strong>Note:</strong> On API level 17 and lower, makeMeasureSpec's 18309 * implementation was such that the order of arguments did not matter 18310 * and overflow in either value could impact the resulting MeasureSpec. 18311 * {@link android.widget.RelativeLayout} was affected by this bug. 18312 * Apps targeting API levels greater than 17 will get the fixed, more strict 18313 * behavior.</p> 18314 * 18315 * @param size the size of the measure specification 18316 * @param mode the mode of the measure specification 18317 * @return the measure specification based on size and mode 18318 */ 18319 public static int makeMeasureSpec(int size, int mode) { 18320 if (sUseBrokenMakeMeasureSpec) { 18321 return size + mode; 18322 } else { 18323 return (size & ~MODE_MASK) | (mode & MODE_MASK); 18324 } 18325 } 18326 18327 /** 18328 * Extracts the mode from the supplied measure specification. 18329 * 18330 * @param measureSpec the measure specification to extract the mode from 18331 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 18332 * {@link android.view.View.MeasureSpec#AT_MOST} or 18333 * {@link android.view.View.MeasureSpec#EXACTLY} 18334 */ 18335 public static int getMode(int measureSpec) { 18336 return (measureSpec & MODE_MASK); 18337 } 18338 18339 /** 18340 * Extracts the size from the supplied measure specification. 18341 * 18342 * @param measureSpec the measure specification to extract the size from 18343 * @return the size in pixels defined in the supplied measure specification 18344 */ 18345 public static int getSize(int measureSpec) { 18346 return (measureSpec & ~MODE_MASK); 18347 } 18348 18349 static int adjust(int measureSpec, int delta) { 18350 return makeMeasureSpec(getSize(measureSpec + delta), getMode(measureSpec)); 18351 } 18352 18353 /** 18354 * Returns a String representation of the specified measure 18355 * specification. 18356 * 18357 * @param measureSpec the measure specification to convert to a String 18358 * @return a String with the following format: "MeasureSpec: MODE SIZE" 18359 */ 18360 public static String toString(int measureSpec) { 18361 int mode = getMode(measureSpec); 18362 int size = getSize(measureSpec); 18363 18364 StringBuilder sb = new StringBuilder("MeasureSpec: "); 18365 18366 if (mode == UNSPECIFIED) 18367 sb.append("UNSPECIFIED "); 18368 else if (mode == EXACTLY) 18369 sb.append("EXACTLY "); 18370 else if (mode == AT_MOST) 18371 sb.append("AT_MOST "); 18372 else 18373 sb.append(mode).append(" "); 18374 18375 sb.append(size); 18376 return sb.toString(); 18377 } 18378 } 18379 18380 class CheckForLongPress implements Runnable { 18381 18382 private int mOriginalWindowAttachCount; 18383 18384 public void run() { 18385 if (isPressed() && (mParent != null) 18386 && mOriginalWindowAttachCount == mWindowAttachCount) { 18387 if (performLongClick()) { 18388 mHasPerformedLongPress = true; 18389 } 18390 } 18391 } 18392 18393 public void rememberWindowAttachCount() { 18394 mOriginalWindowAttachCount = mWindowAttachCount; 18395 } 18396 } 18397 18398 private final class CheckForTap implements Runnable { 18399 public void run() { 18400 mPrivateFlags &= ~PFLAG_PREPRESSED; 18401 setPressed(true); 18402 checkForLongClick(ViewConfiguration.getTapTimeout()); 18403 } 18404 } 18405 18406 private final class PerformClick implements Runnable { 18407 public void run() { 18408 performClick(); 18409 } 18410 } 18411 18412 /** @hide */ 18413 public void hackTurnOffWindowResizeAnim(boolean off) { 18414 mAttachInfo.mTurnOffWindowResizeAnim = off; 18415 } 18416 18417 /** 18418 * This method returns a ViewPropertyAnimator object, which can be used to animate 18419 * specific properties on this View. 18420 * 18421 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 18422 */ 18423 public ViewPropertyAnimator animate() { 18424 if (mAnimator == null) { 18425 mAnimator = new ViewPropertyAnimator(this); 18426 } 18427 return mAnimator; 18428 } 18429 18430 /** 18431 * Interface definition for a callback to be invoked when a hardware key event is 18432 * dispatched to this view. The callback will be invoked before the key event is 18433 * given to the view. This is only useful for hardware keyboards; a software input 18434 * method has no obligation to trigger this listener. 18435 */ 18436 public interface OnKeyListener { 18437 /** 18438 * Called when a hardware key is dispatched to a view. This allows listeners to 18439 * get a chance to respond before the target view. 18440 * <p>Key presses in software keyboards will generally NOT trigger this method, 18441 * although some may elect to do so in some situations. Do not assume a 18442 * software input method has to be key-based; even if it is, it may use key presses 18443 * in a different way than you expect, so there is no way to reliably catch soft 18444 * input key presses. 18445 * 18446 * @param v The view the key has been dispatched to. 18447 * @param keyCode The code for the physical key that was pressed 18448 * @param event The KeyEvent object containing full information about 18449 * the event. 18450 * @return True if the listener has consumed the event, false otherwise. 18451 */ 18452 boolean onKey(View v, int keyCode, KeyEvent event); 18453 } 18454 18455 /** 18456 * Interface definition for a callback to be invoked when a touch event is 18457 * dispatched to this view. The callback will be invoked before the touch 18458 * event is given to the view. 18459 */ 18460 public interface OnTouchListener { 18461 /** 18462 * Called when a touch event is dispatched to a view. This allows listeners to 18463 * get a chance to respond before the target view. 18464 * 18465 * @param v The view the touch event has been dispatched to. 18466 * @param event The MotionEvent object containing full information about 18467 * the event. 18468 * @return True if the listener has consumed the event, false otherwise. 18469 */ 18470 boolean onTouch(View v, MotionEvent event); 18471 } 18472 18473 /** 18474 * Interface definition for a callback to be invoked when a hover event is 18475 * dispatched to this view. The callback will be invoked before the hover 18476 * event is given to the view. 18477 */ 18478 public interface OnHoverListener { 18479 /** 18480 * Called when a hover event is dispatched to a view. This allows listeners to 18481 * get a chance to respond before the target view. 18482 * 18483 * @param v The view the hover event has been dispatched to. 18484 * @param event The MotionEvent object containing full information about 18485 * the event. 18486 * @return True if the listener has consumed the event, false otherwise. 18487 */ 18488 boolean onHover(View v, MotionEvent event); 18489 } 18490 18491 /** 18492 * Interface definition for a callback to be invoked when a generic motion event is 18493 * dispatched to this view. The callback will be invoked before the generic motion 18494 * event is given to the view. 18495 */ 18496 public interface OnGenericMotionListener { 18497 /** 18498 * Called when a generic motion event is dispatched to a view. This allows listeners to 18499 * get a chance to respond before the target view. 18500 * 18501 * @param v The view the generic motion event has been dispatched to. 18502 * @param event The MotionEvent object containing full information about 18503 * the event. 18504 * @return True if the listener has consumed the event, false otherwise. 18505 */ 18506 boolean onGenericMotion(View v, MotionEvent event); 18507 } 18508 18509 /** 18510 * Interface definition for a callback to be invoked when a view has been clicked and held. 18511 */ 18512 public interface OnLongClickListener { 18513 /** 18514 * Called when a view has been clicked and held. 18515 * 18516 * @param v The view that was clicked and held. 18517 * 18518 * @return true if the callback consumed the long click, false otherwise. 18519 */ 18520 boolean onLongClick(View v); 18521 } 18522 18523 /** 18524 * Interface definition for a callback to be invoked when a drag is being dispatched 18525 * to this view. The callback will be invoked before the hosting view's own 18526 * onDrag(event) method. If the listener wants to fall back to the hosting view's 18527 * onDrag(event) behavior, it should return 'false' from this callback. 18528 * 18529 * <div class="special reference"> 18530 * <h3>Developer Guides</h3> 18531 * <p>For a guide to implementing drag and drop features, read the 18532 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 18533 * </div> 18534 */ 18535 public interface OnDragListener { 18536 /** 18537 * Called when a drag event is dispatched to a view. This allows listeners 18538 * to get a chance to override base View behavior. 18539 * 18540 * @param v The View that received the drag event. 18541 * @param event The {@link android.view.DragEvent} object for the drag event. 18542 * @return {@code true} if the drag event was handled successfully, or {@code false} 18543 * if the drag event was not handled. Note that {@code false} will trigger the View 18544 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 18545 */ 18546 boolean onDrag(View v, DragEvent event); 18547 } 18548 18549 /** 18550 * Interface definition for a callback to be invoked when the focus state of 18551 * a view changed. 18552 */ 18553 public interface OnFocusChangeListener { 18554 /** 18555 * Called when the focus state of a view has changed. 18556 * 18557 * @param v The view whose state has changed. 18558 * @param hasFocus The new focus state of v. 18559 */ 18560 void onFocusChange(View v, boolean hasFocus); 18561 } 18562 18563 /** 18564 * Interface definition for a callback to be invoked when a view is clicked. 18565 */ 18566 public interface OnClickListener { 18567 /** 18568 * Called when a view has been clicked. 18569 * 18570 * @param v The view that was clicked. 18571 */ 18572 void onClick(View v); 18573 } 18574 18575 /** 18576 * Interface definition for a callback to be invoked when the context menu 18577 * for this view is being built. 18578 */ 18579 public interface OnCreateContextMenuListener { 18580 /** 18581 * Called when the context menu for this view is being built. It is not 18582 * safe to hold onto the menu after this method returns. 18583 * 18584 * @param menu The context menu that is being built 18585 * @param v The view for which the context menu is being built 18586 * @param menuInfo Extra information about the item for which the 18587 * context menu should be shown. This information will vary 18588 * depending on the class of v. 18589 */ 18590 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 18591 } 18592 18593 /** 18594 * Interface definition for a callback to be invoked when the status bar changes 18595 * visibility. This reports <strong>global</strong> changes to the system UI 18596 * state, not what the application is requesting. 18597 * 18598 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 18599 */ 18600 public interface OnSystemUiVisibilityChangeListener { 18601 /** 18602 * Called when the status bar changes visibility because of a call to 18603 * {@link View#setSystemUiVisibility(int)}. 18604 * 18605 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 18606 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 18607 * This tells you the <strong>global</strong> state of these UI visibility 18608 * flags, not what your app is currently applying. 18609 */ 18610 public void onSystemUiVisibilityChange(int visibility); 18611 } 18612 18613 /** 18614 * Interface definition for a callback to be invoked when this view is attached 18615 * or detached from its window. 18616 */ 18617 public interface OnAttachStateChangeListener { 18618 /** 18619 * Called when the view is attached to a window. 18620 * @param v The view that was attached 18621 */ 18622 public void onViewAttachedToWindow(View v); 18623 /** 18624 * Called when the view is detached from a window. 18625 * @param v The view that was detached 18626 */ 18627 public void onViewDetachedFromWindow(View v); 18628 } 18629 18630 private final class UnsetPressedState implements Runnable { 18631 public void run() { 18632 setPressed(false); 18633 } 18634 } 18635 18636 /** 18637 * Base class for derived classes that want to save and restore their own 18638 * state in {@link android.view.View#onSaveInstanceState()}. 18639 */ 18640 public static class BaseSavedState extends AbsSavedState { 18641 /** 18642 * Constructor used when reading from a parcel. Reads the state of the superclass. 18643 * 18644 * @param source 18645 */ 18646 public BaseSavedState(Parcel source) { 18647 super(source); 18648 } 18649 18650 /** 18651 * Constructor called by derived classes when creating their SavedState objects 18652 * 18653 * @param superState The state of the superclass of this view 18654 */ 18655 public BaseSavedState(Parcelable superState) { 18656 super(superState); 18657 } 18658 18659 public static final Parcelable.Creator<BaseSavedState> CREATOR = 18660 new Parcelable.Creator<BaseSavedState>() { 18661 public BaseSavedState createFromParcel(Parcel in) { 18662 return new BaseSavedState(in); 18663 } 18664 18665 public BaseSavedState[] newArray(int size) { 18666 return new BaseSavedState[size]; 18667 } 18668 }; 18669 } 18670 18671 /** 18672 * A set of information given to a view when it is attached to its parent 18673 * window. 18674 */ 18675 static class AttachInfo { 18676 interface Callbacks { 18677 void playSoundEffect(int effectId); 18678 boolean performHapticFeedback(int effectId, boolean always); 18679 } 18680 18681 /** 18682 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 18683 * to a Handler. This class contains the target (View) to invalidate and 18684 * the coordinates of the dirty rectangle. 18685 * 18686 * For performance purposes, this class also implements a pool of up to 18687 * POOL_LIMIT objects that get reused. This reduces memory allocations 18688 * whenever possible. 18689 */ 18690 static class InvalidateInfo { 18691 private static final int POOL_LIMIT = 10; 18692 18693 private static final SynchronizedPool<InvalidateInfo> sPool = 18694 new SynchronizedPool<InvalidateInfo>(POOL_LIMIT); 18695 18696 View target; 18697 18698 int left; 18699 int top; 18700 int right; 18701 int bottom; 18702 18703 public static InvalidateInfo obtain() { 18704 InvalidateInfo instance = sPool.acquire(); 18705 return (instance != null) ? instance : new InvalidateInfo(); 18706 } 18707 18708 public void recycle() { 18709 target = null; 18710 sPool.release(this); 18711 } 18712 } 18713 18714 final IWindowSession mSession; 18715 18716 final IWindow mWindow; 18717 18718 final IBinder mWindowToken; 18719 18720 final Display mDisplay; 18721 18722 final Callbacks mRootCallbacks; 18723 18724 HardwareCanvas mHardwareCanvas; 18725 18726 IWindowId mIWindowId; 18727 WindowId mWindowId; 18728 18729 /** 18730 * The top view of the hierarchy. 18731 */ 18732 View mRootView; 18733 18734 IBinder mPanelParentWindowToken; 18735 Surface mSurface; 18736 18737 boolean mHardwareAccelerated; 18738 boolean mHardwareAccelerationRequested; 18739 HardwareRenderer mHardwareRenderer; 18740 18741 boolean mScreenOn; 18742 18743 /** 18744 * Scale factor used by the compatibility mode 18745 */ 18746 float mApplicationScale; 18747 18748 /** 18749 * Indicates whether the application is in compatibility mode 18750 */ 18751 boolean mScalingRequired; 18752 18753 /** 18754 * If set, ViewRootImpl doesn't use its lame animation for when the window resizes. 18755 */ 18756 boolean mTurnOffWindowResizeAnim; 18757 18758 /** 18759 * Left position of this view's window 18760 */ 18761 int mWindowLeft; 18762 18763 /** 18764 * Top position of this view's window 18765 */ 18766 int mWindowTop; 18767 18768 /** 18769 * Indicates whether views need to use 32-bit drawing caches 18770 */ 18771 boolean mUse32BitDrawingCache; 18772 18773 /** 18774 * For windows that are full-screen but using insets to layout inside 18775 * of the screen areas, these are the current insets to appear inside 18776 * the overscan area of the display. 18777 */ 18778 final Rect mOverscanInsets = new Rect(); 18779 18780 /** 18781 * For windows that are full-screen but using insets to layout inside 18782 * of the screen decorations, these are the current insets for the 18783 * content of the window. 18784 */ 18785 final Rect mContentInsets = new Rect(); 18786 18787 /** 18788 * For windows that are full-screen but using insets to layout inside 18789 * of the screen decorations, these are the current insets for the 18790 * actual visible parts of the window. 18791 */ 18792 final Rect mVisibleInsets = new Rect(); 18793 18794 /** 18795 * The internal insets given by this window. This value is 18796 * supplied by the client (through 18797 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 18798 * be given to the window manager when changed to be used in laying 18799 * out windows behind it. 18800 */ 18801 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 18802 = new ViewTreeObserver.InternalInsetsInfo(); 18803 18804 /** 18805 * Set to true when mGivenInternalInsets is non-empty. 18806 */ 18807 boolean mHasNonEmptyGivenInternalInsets; 18808 18809 /** 18810 * All views in the window's hierarchy that serve as scroll containers, 18811 * used to determine if the window can be resized or must be panned 18812 * to adjust for a soft input area. 18813 */ 18814 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 18815 18816 final KeyEvent.DispatcherState mKeyDispatchState 18817 = new KeyEvent.DispatcherState(); 18818 18819 /** 18820 * Indicates whether the view's window currently has the focus. 18821 */ 18822 boolean mHasWindowFocus; 18823 18824 /** 18825 * The current visibility of the window. 18826 */ 18827 int mWindowVisibility; 18828 18829 /** 18830 * Indicates the time at which drawing started to occur. 18831 */ 18832 long mDrawingTime; 18833 18834 /** 18835 * Indicates whether or not ignoring the DIRTY_MASK flags. 18836 */ 18837 boolean mIgnoreDirtyState; 18838 18839 /** 18840 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 18841 * to avoid clearing that flag prematurely. 18842 */ 18843 boolean mSetIgnoreDirtyState = false; 18844 18845 /** 18846 * Indicates whether the view's window is currently in touch mode. 18847 */ 18848 boolean mInTouchMode; 18849 18850 /** 18851 * Indicates that ViewAncestor should trigger a global layout change 18852 * the next time it performs a traversal 18853 */ 18854 boolean mRecomputeGlobalAttributes; 18855 18856 /** 18857 * Always report new attributes at next traversal. 18858 */ 18859 boolean mForceReportNewAttributes; 18860 18861 /** 18862 * Set during a traveral if any views want to keep the screen on. 18863 */ 18864 boolean mKeepScreenOn; 18865 18866 /** 18867 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 18868 */ 18869 int mSystemUiVisibility; 18870 18871 /** 18872 * Hack to force certain system UI visibility flags to be cleared. 18873 */ 18874 int mDisabledSystemUiVisibility; 18875 18876 /** 18877 * Last global system UI visibility reported by the window manager. 18878 */ 18879 int mGlobalSystemUiVisibility; 18880 18881 /** 18882 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 18883 * attached. 18884 */ 18885 boolean mHasSystemUiListeners; 18886 18887 /** 18888 * Set if the window has requested to extend into the overscan region 18889 * via WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN. 18890 */ 18891 boolean mOverscanRequested; 18892 18893 /** 18894 * Set if the visibility of any views has changed. 18895 */ 18896 boolean mViewVisibilityChanged; 18897 18898 /** 18899 * Set to true if a view has been scrolled. 18900 */ 18901 boolean mViewScrollChanged; 18902 18903 /** 18904 * Global to the view hierarchy used as a temporary for dealing with 18905 * x/y points in the transparent region computations. 18906 */ 18907 final int[] mTransparentLocation = new int[2]; 18908 18909 /** 18910 * Global to the view hierarchy used as a temporary for dealing with 18911 * x/y points in the ViewGroup.invalidateChild implementation. 18912 */ 18913 final int[] mInvalidateChildLocation = new int[2]; 18914 18915 18916 /** 18917 * Global to the view hierarchy used as a temporary for dealing with 18918 * x/y location when view is transformed. 18919 */ 18920 final float[] mTmpTransformLocation = new float[2]; 18921 18922 /** 18923 * The view tree observer used to dispatch global events like 18924 * layout, pre-draw, touch mode change, etc. 18925 */ 18926 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 18927 18928 /** 18929 * A Canvas used by the view hierarchy to perform bitmap caching. 18930 */ 18931 Canvas mCanvas; 18932 18933 /** 18934 * The view root impl. 18935 */ 18936 final ViewRootImpl mViewRootImpl; 18937 18938 /** 18939 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 18940 * handler can be used to pump events in the UI events queue. 18941 */ 18942 final Handler mHandler; 18943 18944 /** 18945 * Temporary for use in computing invalidate rectangles while 18946 * calling up the hierarchy. 18947 */ 18948 final Rect mTmpInvalRect = new Rect(); 18949 18950 /** 18951 * Temporary for use in computing hit areas with transformed views 18952 */ 18953 final RectF mTmpTransformRect = new RectF(); 18954 18955 /** 18956 * Temporary for use in transforming invalidation rect 18957 */ 18958 final Matrix mTmpMatrix = new Matrix(); 18959 18960 /** 18961 * Temporary for use in transforming invalidation rect 18962 */ 18963 final Transformation mTmpTransformation = new Transformation(); 18964 18965 /** 18966 * Temporary list for use in collecting focusable descendents of a view. 18967 */ 18968 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 18969 18970 /** 18971 * The id of the window for accessibility purposes. 18972 */ 18973 int mAccessibilityWindowId = View.NO_ID; 18974 18975 /** 18976 * Flags related to accessibility processing. 18977 * 18978 * @see AccessibilityNodeInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS 18979 * @see AccessibilityNodeInfo#FLAG_REPORT_VIEW_IDS 18980 */ 18981 int mAccessibilityFetchFlags; 18982 18983 /** 18984 * The drawable for highlighting accessibility focus. 18985 */ 18986 Drawable mAccessibilityFocusDrawable; 18987 18988 /** 18989 * Show where the margins, bounds and layout bounds are for each view. 18990 */ 18991 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 18992 18993 /** 18994 * Point used to compute visible regions. 18995 */ 18996 final Point mPoint = new Point(); 18997 18998 /** 18999 * Used to track which View originated a requestLayout() call, used when 19000 * requestLayout() is called during layout. 19001 */ 19002 View mViewRequestingLayout; 19003 19004 /** 19005 * Creates a new set of attachment information with the specified 19006 * events handler and thread. 19007 * 19008 * @param handler the events handler the view must use 19009 */ 19010 AttachInfo(IWindowSession session, IWindow window, Display display, 19011 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 19012 mSession = session; 19013 mWindow = window; 19014 mWindowToken = window.asBinder(); 19015 mDisplay = display; 19016 mViewRootImpl = viewRootImpl; 19017 mHandler = handler; 19018 mRootCallbacks = effectPlayer; 19019 } 19020 } 19021 19022 /** 19023 * <p>ScrollabilityCache holds various fields used by a View when scrolling 19024 * is supported. This avoids keeping too many unused fields in most 19025 * instances of View.</p> 19026 */ 19027 private static class ScrollabilityCache implements Runnable { 19028 19029 /** 19030 * Scrollbars are not visible 19031 */ 19032 public static final int OFF = 0; 19033 19034 /** 19035 * Scrollbars are visible 19036 */ 19037 public static final int ON = 1; 19038 19039 /** 19040 * Scrollbars are fading away 19041 */ 19042 public static final int FADING = 2; 19043 19044 public boolean fadeScrollBars; 19045 19046 public int fadingEdgeLength; 19047 public int scrollBarDefaultDelayBeforeFade; 19048 public int scrollBarFadeDuration; 19049 19050 public int scrollBarSize; 19051 public ScrollBarDrawable scrollBar; 19052 public float[] interpolatorValues; 19053 public View host; 19054 19055 public final Paint paint; 19056 public final Matrix matrix; 19057 public Shader shader; 19058 19059 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 19060 19061 private static final float[] OPAQUE = { 255 }; 19062 private static final float[] TRANSPARENT = { 0.0f }; 19063 19064 /** 19065 * When fading should start. This time moves into the future every time 19066 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 19067 */ 19068 public long fadeStartTime; 19069 19070 19071 /** 19072 * The current state of the scrollbars: ON, OFF, or FADING 19073 */ 19074 public int state = OFF; 19075 19076 private int mLastColor; 19077 19078 public ScrollabilityCache(ViewConfiguration configuration, View host) { 19079 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 19080 scrollBarSize = configuration.getScaledScrollBarSize(); 19081 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 19082 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 19083 19084 paint = new Paint(); 19085 matrix = new Matrix(); 19086 // use use a height of 1, and then wack the matrix each time we 19087 // actually use it. 19088 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 19089 paint.setShader(shader); 19090 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 19091 19092 this.host = host; 19093 } 19094 19095 public void setFadeColor(int color) { 19096 if (color != mLastColor) { 19097 mLastColor = color; 19098 19099 if (color != 0) { 19100 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 19101 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 19102 paint.setShader(shader); 19103 // Restore the default transfer mode (src_over) 19104 paint.setXfermode(null); 19105 } else { 19106 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 19107 paint.setShader(shader); 19108 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 19109 } 19110 } 19111 } 19112 19113 public void run() { 19114 long now = AnimationUtils.currentAnimationTimeMillis(); 19115 if (now >= fadeStartTime) { 19116 19117 // the animation fades the scrollbars out by changing 19118 // the opacity (alpha) from fully opaque to fully 19119 // transparent 19120 int nextFrame = (int) now; 19121 int framesCount = 0; 19122 19123 Interpolator interpolator = scrollBarInterpolator; 19124 19125 // Start opaque 19126 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 19127 19128 // End transparent 19129 nextFrame += scrollBarFadeDuration; 19130 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 19131 19132 state = FADING; 19133 19134 // Kick off the fade animation 19135 host.invalidate(true); 19136 } 19137 } 19138 } 19139 19140 /** 19141 * Resuable callback for sending 19142 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 19143 */ 19144 private class SendViewScrolledAccessibilityEvent implements Runnable { 19145 public volatile boolean mIsPending; 19146 19147 public void run() { 19148 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 19149 mIsPending = false; 19150 } 19151 } 19152 19153 /** 19154 * <p> 19155 * This class represents a delegate that can be registered in a {@link View} 19156 * to enhance accessibility support via composition rather via inheritance. 19157 * It is specifically targeted to widget developers that extend basic View 19158 * classes i.e. classes in package android.view, that would like their 19159 * applications to be backwards compatible. 19160 * </p> 19161 * <div class="special reference"> 19162 * <h3>Developer Guides</h3> 19163 * <p>For more information about making applications accessible, read the 19164 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 19165 * developer guide.</p> 19166 * </div> 19167 * <p> 19168 * A scenario in which a developer would like to use an accessibility delegate 19169 * is overriding a method introduced in a later API version then the minimal API 19170 * version supported by the application. For example, the method 19171 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 19172 * in API version 4 when the accessibility APIs were first introduced. If a 19173 * developer would like his application to run on API version 4 devices (assuming 19174 * all other APIs used by the application are version 4 or lower) and take advantage 19175 * of this method, instead of overriding the method which would break the application's 19176 * backwards compatibility, he can override the corresponding method in this 19177 * delegate and register the delegate in the target View if the API version of 19178 * the system is high enough i.e. the API version is same or higher to the API 19179 * version that introduced 19180 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 19181 * </p> 19182 * <p> 19183 * Here is an example implementation: 19184 * </p> 19185 * <code><pre><p> 19186 * if (Build.VERSION.SDK_INT >= 14) { 19187 * // If the API version is equal of higher than the version in 19188 * // which onInitializeAccessibilityNodeInfo was introduced we 19189 * // register a delegate with a customized implementation. 19190 * View view = findViewById(R.id.view_id); 19191 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 19192 * public void onInitializeAccessibilityNodeInfo(View host, 19193 * AccessibilityNodeInfo info) { 19194 * // Let the default implementation populate the info. 19195 * super.onInitializeAccessibilityNodeInfo(host, info); 19196 * // Set some other information. 19197 * info.setEnabled(host.isEnabled()); 19198 * } 19199 * }); 19200 * } 19201 * </code></pre></p> 19202 * <p> 19203 * This delegate contains methods that correspond to the accessibility methods 19204 * in View. If a delegate has been specified the implementation in View hands 19205 * off handling to the corresponding method in this delegate. The default 19206 * implementation the delegate methods behaves exactly as the corresponding 19207 * method in View for the case of no accessibility delegate been set. Hence, 19208 * to customize the behavior of a View method, clients can override only the 19209 * corresponding delegate method without altering the behavior of the rest 19210 * accessibility related methods of the host view. 19211 * </p> 19212 */ 19213 public static class AccessibilityDelegate { 19214 19215 /** 19216 * Sends an accessibility event of the given type. If accessibility is not 19217 * enabled this method has no effect. 19218 * <p> 19219 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 19220 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 19221 * been set. 19222 * </p> 19223 * 19224 * @param host The View hosting the delegate. 19225 * @param eventType The type of the event to send. 19226 * 19227 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 19228 */ 19229 public void sendAccessibilityEvent(View host, int eventType) { 19230 host.sendAccessibilityEventInternal(eventType); 19231 } 19232 19233 /** 19234 * Performs the specified accessibility action on the view. For 19235 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 19236 * <p> 19237 * The default implementation behaves as 19238 * {@link View#performAccessibilityAction(int, Bundle) 19239 * View#performAccessibilityAction(int, Bundle)} for the case of 19240 * no accessibility delegate been set. 19241 * </p> 19242 * 19243 * @param action The action to perform. 19244 * @return Whether the action was performed. 19245 * 19246 * @see View#performAccessibilityAction(int, Bundle) 19247 * View#performAccessibilityAction(int, Bundle) 19248 */ 19249 public boolean performAccessibilityAction(View host, int action, Bundle args) { 19250 return host.performAccessibilityActionInternal(action, args); 19251 } 19252 19253 /** 19254 * Sends an accessibility event. This method behaves exactly as 19255 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 19256 * empty {@link AccessibilityEvent} and does not perform a check whether 19257 * accessibility is enabled. 19258 * <p> 19259 * The default implementation behaves as 19260 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 19261 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 19262 * the case of no accessibility delegate been set. 19263 * </p> 19264 * 19265 * @param host The View hosting the delegate. 19266 * @param event The event to send. 19267 * 19268 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 19269 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 19270 */ 19271 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 19272 host.sendAccessibilityEventUncheckedInternal(event); 19273 } 19274 19275 /** 19276 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 19277 * to its children for adding their text content to the event. 19278 * <p> 19279 * The default implementation behaves as 19280 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 19281 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 19282 * the case of no accessibility delegate been set. 19283 * </p> 19284 * 19285 * @param host The View hosting the delegate. 19286 * @param event The event. 19287 * @return True if the event population was completed. 19288 * 19289 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 19290 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 19291 */ 19292 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 19293 return host.dispatchPopulateAccessibilityEventInternal(event); 19294 } 19295 19296 /** 19297 * Gives a chance to the host View to populate the accessibility event with its 19298 * text content. 19299 * <p> 19300 * The default implementation behaves as 19301 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 19302 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 19303 * the case of no accessibility delegate been set. 19304 * </p> 19305 * 19306 * @param host The View hosting the delegate. 19307 * @param event The accessibility event which to populate. 19308 * 19309 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 19310 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 19311 */ 19312 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 19313 host.onPopulateAccessibilityEventInternal(event); 19314 } 19315 19316 /** 19317 * Initializes an {@link AccessibilityEvent} with information about the 19318 * the host View which is the event source. 19319 * <p> 19320 * The default implementation behaves as 19321 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 19322 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 19323 * the case of no accessibility delegate been set. 19324 * </p> 19325 * 19326 * @param host The View hosting the delegate. 19327 * @param event The event to initialize. 19328 * 19329 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 19330 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 19331 */ 19332 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 19333 host.onInitializeAccessibilityEventInternal(event); 19334 } 19335 19336 /** 19337 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 19338 * <p> 19339 * The default implementation behaves as 19340 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 19341 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 19342 * the case of no accessibility delegate been set. 19343 * </p> 19344 * 19345 * @param host The View hosting the delegate. 19346 * @param info The instance to initialize. 19347 * 19348 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 19349 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 19350 */ 19351 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 19352 host.onInitializeAccessibilityNodeInfoInternal(info); 19353 } 19354 19355 /** 19356 * Called when a child of the host View has requested sending an 19357 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 19358 * to augment the event. 19359 * <p> 19360 * The default implementation behaves as 19361 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 19362 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 19363 * the case of no accessibility delegate been set. 19364 * </p> 19365 * 19366 * @param host The View hosting the delegate. 19367 * @param child The child which requests sending the event. 19368 * @param event The event to be sent. 19369 * @return True if the event should be sent 19370 * 19371 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 19372 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 19373 */ 19374 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 19375 AccessibilityEvent event) { 19376 return host.onRequestSendAccessibilityEventInternal(child, event); 19377 } 19378 19379 /** 19380 * Gets the provider for managing a virtual view hierarchy rooted at this View 19381 * and reported to {@link android.accessibilityservice.AccessibilityService}s 19382 * that explore the window content. 19383 * <p> 19384 * The default implementation behaves as 19385 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 19386 * the case of no accessibility delegate been set. 19387 * </p> 19388 * 19389 * @return The provider. 19390 * 19391 * @see AccessibilityNodeProvider 19392 */ 19393 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 19394 return null; 19395 } 19396 19397 /** 19398 * Returns an {@link AccessibilityNodeInfo} representing the host view from the 19399 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 19400 * This method is responsible for obtaining an accessibility node info from a 19401 * pool of reusable instances and calling 19402 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on the host 19403 * view to initialize the former. 19404 * <p> 19405 * <strong>Note:</strong> The client is responsible for recycling the obtained 19406 * instance by calling {@link AccessibilityNodeInfo#recycle()} to minimize object 19407 * creation. 19408 * </p> 19409 * <p> 19410 * The default implementation behaves as 19411 * {@link View#createAccessibilityNodeInfo() View#createAccessibilityNodeInfo()} for 19412 * the case of no accessibility delegate been set. 19413 * </p> 19414 * @return A populated {@link AccessibilityNodeInfo}. 19415 * 19416 * @see AccessibilityNodeInfo 19417 * 19418 * @hide 19419 */ 19420 public AccessibilityNodeInfo createAccessibilityNodeInfo(View host) { 19421 return host.createAccessibilityNodeInfoInternal(); 19422 } 19423 } 19424 19425 private class MatchIdPredicate implements Predicate<View> { 19426 public int mId; 19427 19428 @Override 19429 public boolean apply(View view) { 19430 return (view.mID == mId); 19431 } 19432 } 19433 19434 private class MatchLabelForPredicate implements Predicate<View> { 19435 private int mLabeledId; 19436 19437 @Override 19438 public boolean apply(View view) { 19439 return (view.mLabelForId == mLabeledId); 19440 } 19441 } 19442 19443 private class SendViewStateChangedAccessibilityEvent implements Runnable { 19444 private int mChangeTypes = 0; 19445 private boolean mPosted; 19446 private boolean mPostedWithDelay; 19447 private long mLastEventTimeMillis; 19448 19449 @Override 19450 public void run() { 19451 mPosted = false; 19452 mPostedWithDelay = false; 19453 mLastEventTimeMillis = SystemClock.uptimeMillis(); 19454 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 19455 final AccessibilityEvent event = AccessibilityEvent.obtain(); 19456 event.setEventType(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED); 19457 event.setContentChangeTypes(mChangeTypes); 19458 sendAccessibilityEventUnchecked(event); 19459 } 19460 mChangeTypes = 0; 19461 } 19462 19463 public void runOrPost(int changeType) { 19464 mChangeTypes |= changeType; 19465 19466 // If this is a live region or the child of a live region, collect 19467 // all events from this frame and send them on the next frame. 19468 if (inLiveRegion()) { 19469 // If we're already posted with a delay, remove that. 19470 if (mPostedWithDelay) { 19471 removeCallbacks(this); 19472 mPostedWithDelay = false; 19473 } 19474 // Only post if we're not already posted. 19475 if (!mPosted) { 19476 post(this); 19477 mPosted = true; 19478 } 19479 return; 19480 } 19481 19482 if (mPosted) { 19483 return; 19484 } 19485 final long timeSinceLastMillis = SystemClock.uptimeMillis() - mLastEventTimeMillis; 19486 final long minEventIntevalMillis = 19487 ViewConfiguration.getSendRecurringAccessibilityEventsInterval(); 19488 if (timeSinceLastMillis >= minEventIntevalMillis) { 19489 removeCallbacks(this); 19490 run(); 19491 } else { 19492 postDelayed(this, minEventIntevalMillis - timeSinceLastMillis); 19493 mPosted = true; 19494 mPostedWithDelay = true; 19495 } 19496 } 19497 } 19498 19499 private boolean inLiveRegion() { 19500 if (getAccessibilityLiveRegion() != View.ACCESSIBILITY_LIVE_REGION_NONE) { 19501 return true; 19502 } 19503 19504 ViewParent parent = getParent(); 19505 while (parent instanceof View) { 19506 if (((View) parent).getAccessibilityLiveRegion() 19507 != View.ACCESSIBILITY_LIVE_REGION_NONE) { 19508 return true; 19509 } 19510 parent = parent.getParent(); 19511 } 19512 19513 return false; 19514 } 19515 19516 /** 19517 * Dump all private flags in readable format, useful for documentation and 19518 * sanity checking. 19519 */ 19520 private static void dumpFlags() { 19521 final HashMap<String, String> found = Maps.newHashMap(); 19522 try { 19523 for (Field field : View.class.getDeclaredFields()) { 19524 final int modifiers = field.getModifiers(); 19525 if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) { 19526 if (field.getType().equals(int.class)) { 19527 final int value = field.getInt(null); 19528 dumpFlag(found, field.getName(), value); 19529 } else if (field.getType().equals(int[].class)) { 19530 final int[] values = (int[]) field.get(null); 19531 for (int i = 0; i < values.length; i++) { 19532 dumpFlag(found, field.getName() + "[" + i + "]", values[i]); 19533 } 19534 } 19535 } 19536 } 19537 } catch (IllegalAccessException e) { 19538 throw new RuntimeException(e); 19539 } 19540 19541 final ArrayList<String> keys = Lists.newArrayList(); 19542 keys.addAll(found.keySet()); 19543 Collections.sort(keys); 19544 for (String key : keys) { 19545 Log.d(VIEW_LOG_TAG, found.get(key)); 19546 } 19547 } 19548 19549 private static void dumpFlag(HashMap<String, String> found, String name, int value) { 19550 // Sort flags by prefix, then by bits, always keeping unique keys 19551 final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' '); 19552 final int prefix = name.indexOf('_'); 19553 final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name; 19554 final String output = bits + " " + name; 19555 found.put(key, output); 19556 } 19557} 19558