View.java revision fb410d219fae2e07a6be3c7365bedc3e11c96f6c
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.res.Configuration; 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Camera; 26import android.graphics.Canvas; 27import android.graphics.Insets; 28import android.graphics.Interpolator; 29import android.graphics.LinearGradient; 30import android.graphics.Matrix; 31import android.graphics.Paint; 32import android.graphics.PixelFormat; 33import android.graphics.Point; 34import android.graphics.PorterDuff; 35import android.graphics.PorterDuffXfermode; 36import android.graphics.Rect; 37import android.graphics.RectF; 38import android.graphics.Region; 39import android.graphics.Shader; 40import android.graphics.drawable.ColorDrawable; 41import android.graphics.drawable.Drawable; 42import android.hardware.display.DisplayManagerGlobal; 43import android.os.Bundle; 44import android.os.Handler; 45import android.os.IBinder; 46import android.os.Parcel; 47import android.os.Parcelable; 48import android.os.RemoteException; 49import android.os.SystemClock; 50import android.os.SystemProperties; 51import android.text.TextUtils; 52import android.util.AttributeSet; 53import android.util.FloatProperty; 54import android.util.LayoutDirection; 55import android.util.Log; 56import android.util.LongSparseLongArray; 57import android.util.Pools.SynchronizedPool; 58import android.util.Property; 59import android.util.SparseArray; 60import android.util.TypedValue; 61import android.view.ContextMenu.ContextMenuInfo; 62import android.view.AccessibilityIterators.TextSegmentIterator; 63import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 64import android.view.AccessibilityIterators.WordTextSegmentIterator; 65import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 66import android.view.accessibility.AccessibilityEvent; 67import android.view.accessibility.AccessibilityEventSource; 68import android.view.accessibility.AccessibilityManager; 69import android.view.accessibility.AccessibilityNodeInfo; 70import android.view.accessibility.AccessibilityNodeProvider; 71import android.view.animation.Animation; 72import android.view.animation.AnimationUtils; 73import android.view.animation.Transformation; 74import android.view.inputmethod.EditorInfo; 75import android.view.inputmethod.InputConnection; 76import android.view.inputmethod.InputMethodManager; 77import android.view.transition.Scene; 78import android.widget.ScrollBarDrawable; 79 80import static android.os.Build.VERSION_CODES.*; 81import static java.lang.Math.max; 82 83import com.android.internal.R; 84import com.android.internal.util.Predicate; 85import com.android.internal.view.menu.MenuBuilder; 86import com.google.android.collect.Lists; 87import com.google.android.collect.Maps; 88 89import java.lang.ref.WeakReference; 90import java.lang.reflect.Field; 91import java.lang.reflect.InvocationTargetException; 92import java.lang.reflect.Method; 93import java.lang.reflect.Modifier; 94import java.util.ArrayList; 95import java.util.Arrays; 96import java.util.Collections; 97import java.util.HashMap; 98import java.util.Locale; 99import java.util.concurrent.CopyOnWriteArrayList; 100import java.util.concurrent.atomic.AtomicInteger; 101 102/** 103 * <p> 104 * This class represents the basic building block for user interface components. A View 105 * occupies a rectangular area on the screen and is responsible for drawing and 106 * event handling. View is the base class for <em>widgets</em>, which are 107 * used to create interactive UI components (buttons, text fields, etc.). The 108 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 109 * are invisible containers that hold other Views (or other ViewGroups) and define 110 * their layout properties. 111 * </p> 112 * 113 * <div class="special reference"> 114 * <h3>Developer Guides</h3> 115 * <p>For information about using this class to develop your application's user interface, 116 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 117 * </div> 118 * 119 * <a name="Using"></a> 120 * <h3>Using Views</h3> 121 * <p> 122 * All of the views in a window are arranged in a single tree. You can add views 123 * either from code or by specifying a tree of views in one or more XML layout 124 * files. There are many specialized subclasses of views that act as controls or 125 * are capable of displaying text, images, or other content. 126 * </p> 127 * <p> 128 * Once you have created a tree of views, there are typically a few types of 129 * common operations you may wish to perform: 130 * <ul> 131 * <li><strong>Set properties:</strong> for example setting the text of a 132 * {@link android.widget.TextView}. The available properties and the methods 133 * that set them will vary among the different subclasses of views. Note that 134 * properties that are known at build time can be set in the XML layout 135 * files.</li> 136 * <li><strong>Set focus:</strong> The framework will handled moving focus in 137 * response to user input. To force focus to a specific view, call 138 * {@link #requestFocus}.</li> 139 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 140 * that will be notified when something interesting happens to the view. For 141 * example, all views will let you set a listener to be notified when the view 142 * gains or loses focus. You can register such a listener using 143 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 144 * Other view subclasses offer more specialized listeners. For example, a Button 145 * exposes a listener to notify clients when the button is clicked.</li> 146 * <li><strong>Set visibility:</strong> You can hide or show views using 147 * {@link #setVisibility(int)}.</li> 148 * </ul> 149 * </p> 150 * <p><em> 151 * Note: The Android framework is responsible for measuring, laying out and 152 * drawing views. You should not call methods that perform these actions on 153 * views yourself unless you are actually implementing a 154 * {@link android.view.ViewGroup}. 155 * </em></p> 156 * 157 * <a name="Lifecycle"></a> 158 * <h3>Implementing a Custom View</h3> 159 * 160 * <p> 161 * To implement a custom view, you will usually begin by providing overrides for 162 * some of the standard methods that the framework calls on all views. You do 163 * not need to override all of these methods. In fact, you can start by just 164 * overriding {@link #onDraw(android.graphics.Canvas)}. 165 * <table border="2" width="85%" align="center" cellpadding="5"> 166 * <thead> 167 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 168 * </thead> 169 * 170 * <tbody> 171 * <tr> 172 * <td rowspan="2">Creation</td> 173 * <td>Constructors</td> 174 * <td>There is a form of the constructor that are called when the view 175 * is created from code and a form that is called when the view is 176 * inflated from a layout file. The second form should parse and apply 177 * any attributes defined in the layout file. 178 * </td> 179 * </tr> 180 * <tr> 181 * <td><code>{@link #onFinishInflate()}</code></td> 182 * <td>Called after a view and all of its children has been inflated 183 * from XML.</td> 184 * </tr> 185 * 186 * <tr> 187 * <td rowspan="3">Layout</td> 188 * <td><code>{@link #onMeasure(int, int)}</code></td> 189 * <td>Called to determine the size requirements for this view and all 190 * of its children. 191 * </td> 192 * </tr> 193 * <tr> 194 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 195 * <td>Called when this view should assign a size and position to all 196 * of its children. 197 * </td> 198 * </tr> 199 * <tr> 200 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 201 * <td>Called when the size of this view has changed. 202 * </td> 203 * </tr> 204 * 205 * <tr> 206 * <td>Drawing</td> 207 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 208 * <td>Called when the view should render its content. 209 * </td> 210 * </tr> 211 * 212 * <tr> 213 * <td rowspan="4">Event processing</td> 214 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 215 * <td>Called when a new hardware key event occurs. 216 * </td> 217 * </tr> 218 * <tr> 219 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 220 * <td>Called when a hardware key up event occurs. 221 * </td> 222 * </tr> 223 * <tr> 224 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 225 * <td>Called when a trackball motion event occurs. 226 * </td> 227 * </tr> 228 * <tr> 229 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 230 * <td>Called when a touch screen motion event occurs. 231 * </td> 232 * </tr> 233 * 234 * <tr> 235 * <td rowspan="2">Focus</td> 236 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 237 * <td>Called when the view gains or loses focus. 238 * </td> 239 * </tr> 240 * 241 * <tr> 242 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 243 * <td>Called when the window containing the view gains or loses focus. 244 * </td> 245 * </tr> 246 * 247 * <tr> 248 * <td rowspan="3">Attaching</td> 249 * <td><code>{@link #onAttachedToWindow()}</code></td> 250 * <td>Called when the view is attached to a window. 251 * </td> 252 * </tr> 253 * 254 * <tr> 255 * <td><code>{@link #onDetachedFromWindow}</code></td> 256 * <td>Called when the view is detached from its window. 257 * </td> 258 * </tr> 259 * 260 * <tr> 261 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 262 * <td>Called when the visibility of the window containing the view 263 * has changed. 264 * </td> 265 * </tr> 266 * </tbody> 267 * 268 * </table> 269 * </p> 270 * 271 * <a name="IDs"></a> 272 * <h3>IDs</h3> 273 * Views may have an integer id associated with them. These ids are typically 274 * assigned in the layout XML files, and are used to find specific views within 275 * the view tree. A common pattern is to: 276 * <ul> 277 * <li>Define a Button in the layout file and assign it a unique ID. 278 * <pre> 279 * <Button 280 * android:id="@+id/my_button" 281 * android:layout_width="wrap_content" 282 * android:layout_height="wrap_content" 283 * android:text="@string/my_button_text"/> 284 * </pre></li> 285 * <li>From the onCreate method of an Activity, find the Button 286 * <pre class="prettyprint"> 287 * Button myButton = (Button) findViewById(R.id.my_button); 288 * </pre></li> 289 * </ul> 290 * <p> 291 * View IDs need not be unique throughout the tree, but it is good practice to 292 * ensure that they are at least unique within the part of the tree you are 293 * searching. 294 * </p> 295 * 296 * <a name="Position"></a> 297 * <h3>Position</h3> 298 * <p> 299 * The geometry of a view is that of a rectangle. A view has a location, 300 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 301 * two dimensions, expressed as a width and a height. The unit for location 302 * and dimensions is the pixel. 303 * </p> 304 * 305 * <p> 306 * It is possible to retrieve the location of a view by invoking the methods 307 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 308 * coordinate of the rectangle representing the view. The latter returns the 309 * top, or Y, coordinate of the rectangle representing the view. These methods 310 * both return the location of the view relative to its parent. For instance, 311 * when getLeft() returns 20, that means the view is located 20 pixels to the 312 * right of the left edge of its direct parent. 313 * </p> 314 * 315 * <p> 316 * In addition, several convenience methods are offered to avoid unnecessary 317 * computations, namely {@link #getRight()} and {@link #getBottom()}. 318 * These methods return the coordinates of the right and bottom edges of the 319 * rectangle representing the view. For instance, calling {@link #getRight()} 320 * is similar to the following computation: <code>getLeft() + getWidth()</code> 321 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 322 * </p> 323 * 324 * <a name="SizePaddingMargins"></a> 325 * <h3>Size, padding and margins</h3> 326 * <p> 327 * The size of a view is expressed with a width and a height. A view actually 328 * possess two pairs of width and height values. 329 * </p> 330 * 331 * <p> 332 * The first pair is known as <em>measured width</em> and 333 * <em>measured height</em>. These dimensions define how big a view wants to be 334 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 335 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 336 * and {@link #getMeasuredHeight()}. 337 * </p> 338 * 339 * <p> 340 * The second pair is simply known as <em>width</em> and <em>height</em>, or 341 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 342 * dimensions define the actual size of the view on screen, at drawing time and 343 * after layout. These values may, but do not have to, be different from the 344 * measured width and height. The width and height can be obtained by calling 345 * {@link #getWidth()} and {@link #getHeight()}. 346 * </p> 347 * 348 * <p> 349 * To measure its dimensions, a view takes into account its padding. The padding 350 * is expressed in pixels for the left, top, right and bottom parts of the view. 351 * Padding can be used to offset the content of the view by a specific amount of 352 * pixels. For instance, a left padding of 2 will push the view's content by 353 * 2 pixels to the right of the left edge. Padding can be set using the 354 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 355 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 356 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 357 * {@link #getPaddingEnd()}. 358 * </p> 359 * 360 * <p> 361 * Even though a view can define a padding, it does not provide any support for 362 * margins. However, view groups provide such a support. Refer to 363 * {@link android.view.ViewGroup} and 364 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 365 * </p> 366 * 367 * <a name="Layout"></a> 368 * <h3>Layout</h3> 369 * <p> 370 * Layout is a two pass process: a measure pass and a layout pass. The measuring 371 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 372 * of the view tree. Each view pushes dimension specifications down the tree 373 * during the recursion. At the end of the measure pass, every view has stored 374 * its measurements. The second pass happens in 375 * {@link #layout(int,int,int,int)} and is also top-down. During 376 * this pass each parent is responsible for positioning all of its children 377 * using the sizes computed in the measure pass. 378 * </p> 379 * 380 * <p> 381 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 382 * {@link #getMeasuredHeight()} values must be set, along with those for all of 383 * that view's descendants. A view's measured width and measured height values 384 * must respect the constraints imposed by the view's parents. This guarantees 385 * that at the end of the measure pass, all parents accept all of their 386 * children's measurements. A parent view may call measure() more than once on 387 * its children. For example, the parent may measure each child once with 388 * unspecified dimensions to find out how big they want to be, then call 389 * measure() on them again with actual numbers if the sum of all the children's 390 * unconstrained sizes is too big or too small. 391 * </p> 392 * 393 * <p> 394 * The measure pass uses two classes to communicate dimensions. The 395 * {@link MeasureSpec} class is used by views to tell their parents how they 396 * want to be measured and positioned. The base LayoutParams class just 397 * describes how big the view wants to be for both width and height. For each 398 * dimension, it can specify one of: 399 * <ul> 400 * <li> an exact number 401 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 402 * (minus padding) 403 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 404 * enclose its content (plus padding). 405 * </ul> 406 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 407 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 408 * an X and Y value. 409 * </p> 410 * 411 * <p> 412 * MeasureSpecs are used to push requirements down the tree from parent to 413 * child. A MeasureSpec can be in one of three modes: 414 * <ul> 415 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 416 * of a child view. For example, a LinearLayout may call measure() on its child 417 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 418 * tall the child view wants to be given a width of 240 pixels. 419 * <li>EXACTLY: This is used by the parent to impose an exact size on the 420 * child. The child must use this size, and guarantee that all of its 421 * descendants will fit within this size. 422 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 423 * child. The child must gurantee that it and all of its descendants will fit 424 * within this size. 425 * </ul> 426 * </p> 427 * 428 * <p> 429 * To intiate a layout, call {@link #requestLayout}. This method is typically 430 * called by a view on itself when it believes that is can no longer fit within 431 * its current bounds. 432 * </p> 433 * 434 * <a name="Drawing"></a> 435 * <h3>Drawing</h3> 436 * <p> 437 * Drawing is handled by walking the tree and rendering each view that 438 * intersects the invalid region. Because the tree is traversed in-order, 439 * this means that parents will draw before (i.e., behind) their children, with 440 * siblings drawn in the order they appear in the tree. 441 * If you set a background drawable for a View, then the View will draw it for you 442 * before calling back to its <code>onDraw()</code> method. 443 * </p> 444 * 445 * <p> 446 * Note that the framework will not draw views that are not in the invalid region. 447 * </p> 448 * 449 * <p> 450 * To force a view to draw, call {@link #invalidate()}. 451 * </p> 452 * 453 * <a name="EventHandlingThreading"></a> 454 * <h3>Event Handling and Threading</h3> 455 * <p> 456 * The basic cycle of a view is as follows: 457 * <ol> 458 * <li>An event comes in and is dispatched to the appropriate view. The view 459 * handles the event and notifies any listeners.</li> 460 * <li>If in the course of processing the event, the view's bounds may need 461 * to be changed, the view will call {@link #requestLayout()}.</li> 462 * <li>Similarly, if in the course of processing the event the view's appearance 463 * may need to be changed, the view will call {@link #invalidate()}.</li> 464 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 465 * the framework will take care of measuring, laying out, and drawing the tree 466 * as appropriate.</li> 467 * </ol> 468 * </p> 469 * 470 * <p><em>Note: The entire view tree is single threaded. You must always be on 471 * the UI thread when calling any method on any view.</em> 472 * If you are doing work on other threads and want to update the state of a view 473 * from that thread, you should use a {@link Handler}. 474 * </p> 475 * 476 * <a name="FocusHandling"></a> 477 * <h3>Focus Handling</h3> 478 * <p> 479 * The framework will handle routine focus movement in response to user input. 480 * This includes changing the focus as views are removed or hidden, or as new 481 * views become available. Views indicate their willingness to take focus 482 * through the {@link #isFocusable} method. To change whether a view can take 483 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 484 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 485 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 486 * </p> 487 * <p> 488 * Focus movement is based on an algorithm which finds the nearest neighbor in a 489 * given direction. In rare cases, the default algorithm may not match the 490 * intended behavior of the developer. In these situations, you can provide 491 * explicit overrides by using these XML attributes in the layout file: 492 * <pre> 493 * nextFocusDown 494 * nextFocusLeft 495 * nextFocusRight 496 * nextFocusUp 497 * </pre> 498 * </p> 499 * 500 * 501 * <p> 502 * To get a particular view to take focus, call {@link #requestFocus()}. 503 * </p> 504 * 505 * <a name="TouchMode"></a> 506 * <h3>Touch Mode</h3> 507 * <p> 508 * When a user is navigating a user interface via directional keys such as a D-pad, it is 509 * necessary to give focus to actionable items such as buttons so the user can see 510 * what will take input. If the device has touch capabilities, however, and the user 511 * begins interacting with the interface by touching it, it is no longer necessary to 512 * always highlight, or give focus to, a particular view. This motivates a mode 513 * for interaction named 'touch mode'. 514 * </p> 515 * <p> 516 * For a touch capable device, once the user touches the screen, the device 517 * will enter touch mode. From this point onward, only views for which 518 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 519 * Other views that are touchable, like buttons, will not take focus when touched; they will 520 * only fire the on click listeners. 521 * </p> 522 * <p> 523 * Any time a user hits a directional key, such as a D-pad direction, the view device will 524 * exit touch mode, and find a view to take focus, so that the user may resume interacting 525 * with the user interface without touching the screen again. 526 * </p> 527 * <p> 528 * The touch mode state is maintained across {@link android.app.Activity}s. Call 529 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 530 * </p> 531 * 532 * <a name="Scrolling"></a> 533 * <h3>Scrolling</h3> 534 * <p> 535 * The framework provides basic support for views that wish to internally 536 * scroll their content. This includes keeping track of the X and Y scroll 537 * offset as well as mechanisms for drawing scrollbars. See 538 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 539 * {@link #awakenScrollBars()} for more details. 540 * </p> 541 * 542 * <a name="Tags"></a> 543 * <h3>Tags</h3> 544 * <p> 545 * Unlike IDs, tags are not used to identify views. Tags are essentially an 546 * extra piece of information that can be associated with a view. They are most 547 * often used as a convenience to store data related to views in the views 548 * themselves rather than by putting them in a separate structure. 549 * </p> 550 * 551 * <a name="Properties"></a> 552 * <h3>Properties</h3> 553 * <p> 554 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 555 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 556 * available both in the {@link Property} form as well as in similarly-named setter/getter 557 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 558 * be used to set persistent state associated with these rendering-related properties on the view. 559 * The properties and methods can also be used in conjunction with 560 * {@link android.animation.Animator Animator}-based animations, described more in the 561 * <a href="#Animation">Animation</a> section. 562 * </p> 563 * 564 * <a name="Animation"></a> 565 * <h3>Animation</h3> 566 * <p> 567 * Starting with Android 3.0, the preferred way of animating views is to use the 568 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 569 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 570 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 571 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 572 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 573 * makes animating these View properties particularly easy and efficient. 574 * </p> 575 * <p> 576 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 577 * You can attach an {@link Animation} object to a view using 578 * {@link #setAnimation(Animation)} or 579 * {@link #startAnimation(Animation)}. The animation can alter the scale, 580 * rotation, translation and alpha of a view over time. If the animation is 581 * attached to a view that has children, the animation will affect the entire 582 * subtree rooted by that node. When an animation is started, the framework will 583 * take care of redrawing the appropriate views until the animation completes. 584 * </p> 585 * 586 * <a name="Security"></a> 587 * <h3>Security</h3> 588 * <p> 589 * Sometimes it is essential that an application be able to verify that an action 590 * is being performed with the full knowledge and consent of the user, such as 591 * granting a permission request, making a purchase or clicking on an advertisement. 592 * Unfortunately, a malicious application could try to spoof the user into 593 * performing these actions, unaware, by concealing the intended purpose of the view. 594 * As a remedy, the framework offers a touch filtering mechanism that can be used to 595 * improve the security of views that provide access to sensitive functionality. 596 * </p><p> 597 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 598 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 599 * will discard touches that are received whenever the view's window is obscured by 600 * another visible window. As a result, the view will not receive touches whenever a 601 * toast, dialog or other window appears above the view's window. 602 * </p><p> 603 * For more fine-grained control over security, consider overriding the 604 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 605 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 606 * </p> 607 * 608 * @attr ref android.R.styleable#View_alpha 609 * @attr ref android.R.styleable#View_background 610 * @attr ref android.R.styleable#View_clickable 611 * @attr ref android.R.styleable#View_contentDescription 612 * @attr ref android.R.styleable#View_drawingCacheQuality 613 * @attr ref android.R.styleable#View_duplicateParentState 614 * @attr ref android.R.styleable#View_id 615 * @attr ref android.R.styleable#View_requiresFadingEdge 616 * @attr ref android.R.styleable#View_fadeScrollbars 617 * @attr ref android.R.styleable#View_fadingEdgeLength 618 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 619 * @attr ref android.R.styleable#View_fitsSystemWindows 620 * @attr ref android.R.styleable#View_isScrollContainer 621 * @attr ref android.R.styleable#View_focusable 622 * @attr ref android.R.styleable#View_focusableInTouchMode 623 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 624 * @attr ref android.R.styleable#View_keepScreenOn 625 * @attr ref android.R.styleable#View_layerType 626 * @attr ref android.R.styleable#View_layoutDirection 627 * @attr ref android.R.styleable#View_longClickable 628 * @attr ref android.R.styleable#View_minHeight 629 * @attr ref android.R.styleable#View_minWidth 630 * @attr ref android.R.styleable#View_nextFocusDown 631 * @attr ref android.R.styleable#View_nextFocusLeft 632 * @attr ref android.R.styleable#View_nextFocusRight 633 * @attr ref android.R.styleable#View_nextFocusUp 634 * @attr ref android.R.styleable#View_onClick 635 * @attr ref android.R.styleable#View_padding 636 * @attr ref android.R.styleable#View_paddingBottom 637 * @attr ref android.R.styleable#View_paddingLeft 638 * @attr ref android.R.styleable#View_paddingRight 639 * @attr ref android.R.styleable#View_paddingTop 640 * @attr ref android.R.styleable#View_paddingStart 641 * @attr ref android.R.styleable#View_paddingEnd 642 * @attr ref android.R.styleable#View_saveEnabled 643 * @attr ref android.R.styleable#View_rotation 644 * @attr ref android.R.styleable#View_rotationX 645 * @attr ref android.R.styleable#View_rotationY 646 * @attr ref android.R.styleable#View_scaleX 647 * @attr ref android.R.styleable#View_scaleY 648 * @attr ref android.R.styleable#View_scrollX 649 * @attr ref android.R.styleable#View_scrollY 650 * @attr ref android.R.styleable#View_scrollbarSize 651 * @attr ref android.R.styleable#View_scrollbarStyle 652 * @attr ref android.R.styleable#View_scrollbars 653 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 654 * @attr ref android.R.styleable#View_scrollbarFadeDuration 655 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 656 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 657 * @attr ref android.R.styleable#View_scrollbarThumbVertical 658 * @attr ref android.R.styleable#View_scrollbarTrackVertical 659 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 660 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 661 * @attr ref android.R.styleable#View_soundEffectsEnabled 662 * @attr ref android.R.styleable#View_tag 663 * @attr ref android.R.styleable#View_textAlignment 664 * @attr ref android.R.styleable#View_textDirection 665 * @attr ref android.R.styleable#View_transformPivotX 666 * @attr ref android.R.styleable#View_transformPivotY 667 * @attr ref android.R.styleable#View_translationX 668 * @attr ref android.R.styleable#View_translationY 669 * @attr ref android.R.styleable#View_visibility 670 * 671 * @see android.view.ViewGroup 672 */ 673public class View implements Drawable.Callback, KeyEvent.Callback, 674 AccessibilityEventSource { 675 private static final boolean DBG = false; 676 677 /** 678 * The logging tag used by this class with android.util.Log. 679 */ 680 protected static final String VIEW_LOG_TAG = "View"; 681 682 /** 683 * When set to true, apps will draw debugging information about their layouts. 684 * 685 * @hide 686 */ 687 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 688 689 /** 690 * Used to mark a View that has no ID. 691 */ 692 public static final int NO_ID = -1; 693 694 private static boolean sUseBrokenMakeMeasureSpec = false; 695 696 /** 697 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 698 * calling setFlags. 699 */ 700 private static final int NOT_FOCUSABLE = 0x00000000; 701 702 /** 703 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 704 * setFlags. 705 */ 706 private static final int FOCUSABLE = 0x00000001; 707 708 /** 709 * Mask for use with setFlags indicating bits used for focus. 710 */ 711 private static final int FOCUSABLE_MASK = 0x00000001; 712 713 /** 714 * This view will adjust its padding to fit sytem windows (e.g. status bar) 715 */ 716 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 717 718 /** 719 * This view is visible. 720 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 721 * android:visibility}. 722 */ 723 public static final int VISIBLE = 0x00000000; 724 725 /** 726 * This view is invisible, but it still takes up space for layout purposes. 727 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 728 * android:visibility}. 729 */ 730 public static final int INVISIBLE = 0x00000004; 731 732 /** 733 * This view is invisible, and it doesn't take any space for layout 734 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 735 * android:visibility}. 736 */ 737 public static final int GONE = 0x00000008; 738 739 /** 740 * Mask for use with setFlags indicating bits used for visibility. 741 * {@hide} 742 */ 743 static final int VISIBILITY_MASK = 0x0000000C; 744 745 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 746 747 /** 748 * This view is enabled. Interpretation varies by subclass. 749 * Use with ENABLED_MASK when calling setFlags. 750 * {@hide} 751 */ 752 static final int ENABLED = 0x00000000; 753 754 /** 755 * This view is disabled. Interpretation varies by subclass. 756 * Use with ENABLED_MASK when calling setFlags. 757 * {@hide} 758 */ 759 static final int DISABLED = 0x00000020; 760 761 /** 762 * Mask for use with setFlags indicating bits used for indicating whether 763 * this view is enabled 764 * {@hide} 765 */ 766 static final int ENABLED_MASK = 0x00000020; 767 768 /** 769 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 770 * called and further optimizations will be performed. It is okay to have 771 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 772 * {@hide} 773 */ 774 static final int WILL_NOT_DRAW = 0x00000080; 775 776 /** 777 * Mask for use with setFlags indicating bits used for indicating whether 778 * this view is will draw 779 * {@hide} 780 */ 781 static final int DRAW_MASK = 0x00000080; 782 783 /** 784 * <p>This view doesn't show scrollbars.</p> 785 * {@hide} 786 */ 787 static final int SCROLLBARS_NONE = 0x00000000; 788 789 /** 790 * <p>This view shows horizontal scrollbars.</p> 791 * {@hide} 792 */ 793 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 794 795 /** 796 * <p>This view shows vertical scrollbars.</p> 797 * {@hide} 798 */ 799 static final int SCROLLBARS_VERTICAL = 0x00000200; 800 801 /** 802 * <p>Mask for use with setFlags indicating bits used for indicating which 803 * scrollbars are enabled.</p> 804 * {@hide} 805 */ 806 static final int SCROLLBARS_MASK = 0x00000300; 807 808 /** 809 * Indicates that the view should filter touches when its window is obscured. 810 * Refer to the class comments for more information about this security feature. 811 * {@hide} 812 */ 813 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 814 815 /** 816 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 817 * that they are optional and should be skipped if the window has 818 * requested system UI flags that ignore those insets for layout. 819 */ 820 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 821 822 /** 823 * <p>This view doesn't show fading edges.</p> 824 * {@hide} 825 */ 826 static final int FADING_EDGE_NONE = 0x00000000; 827 828 /** 829 * <p>This view shows horizontal fading edges.</p> 830 * {@hide} 831 */ 832 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 833 834 /** 835 * <p>This view shows vertical fading edges.</p> 836 * {@hide} 837 */ 838 static final int FADING_EDGE_VERTICAL = 0x00002000; 839 840 /** 841 * <p>Mask for use with setFlags indicating bits used for indicating which 842 * fading edges are enabled.</p> 843 * {@hide} 844 */ 845 static final int FADING_EDGE_MASK = 0x00003000; 846 847 /** 848 * <p>Indicates this view can be clicked. When clickable, a View reacts 849 * to clicks by notifying the OnClickListener.<p> 850 * {@hide} 851 */ 852 static final int CLICKABLE = 0x00004000; 853 854 /** 855 * <p>Indicates this view is caching its drawing into a bitmap.</p> 856 * {@hide} 857 */ 858 static final int DRAWING_CACHE_ENABLED = 0x00008000; 859 860 /** 861 * <p>Indicates that no icicle should be saved for this view.<p> 862 * {@hide} 863 */ 864 static final int SAVE_DISABLED = 0x000010000; 865 866 /** 867 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 868 * property.</p> 869 * {@hide} 870 */ 871 static final int SAVE_DISABLED_MASK = 0x000010000; 872 873 /** 874 * <p>Indicates that no drawing cache should ever be created for this view.<p> 875 * {@hide} 876 */ 877 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 878 879 /** 880 * <p>Indicates this view can take / keep focus when int touch mode.</p> 881 * {@hide} 882 */ 883 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 884 885 /** 886 * <p>Enables low quality mode for the drawing cache.</p> 887 */ 888 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 889 890 /** 891 * <p>Enables high quality mode for the drawing cache.</p> 892 */ 893 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 894 895 /** 896 * <p>Enables automatic quality mode for the drawing cache.</p> 897 */ 898 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 899 900 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 901 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 902 }; 903 904 /** 905 * <p>Mask for use with setFlags indicating bits used for the cache 906 * quality property.</p> 907 * {@hide} 908 */ 909 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 910 911 /** 912 * <p> 913 * Indicates this view can be long clicked. When long clickable, a View 914 * reacts to long clicks by notifying the OnLongClickListener or showing a 915 * context menu. 916 * </p> 917 * {@hide} 918 */ 919 static final int LONG_CLICKABLE = 0x00200000; 920 921 /** 922 * <p>Indicates that this view gets its drawable states from its direct parent 923 * and ignores its original internal states.</p> 924 * 925 * @hide 926 */ 927 static final int DUPLICATE_PARENT_STATE = 0x00400000; 928 929 /** 930 * The scrollbar style to display the scrollbars inside the content area, 931 * without increasing the padding. The scrollbars will be overlaid with 932 * translucency on the view's content. 933 */ 934 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 935 936 /** 937 * The scrollbar style to display the scrollbars inside the padded area, 938 * increasing the padding of the view. The scrollbars will not overlap the 939 * content area of the view. 940 */ 941 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 942 943 /** 944 * The scrollbar style to display the scrollbars at the edge of the view, 945 * without increasing the padding. The scrollbars will be overlaid with 946 * translucency. 947 */ 948 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 949 950 /** 951 * The scrollbar style to display the scrollbars at the edge of the view, 952 * increasing the padding of the view. The scrollbars will only overlap the 953 * background, if any. 954 */ 955 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 956 957 /** 958 * Mask to check if the scrollbar style is overlay or inset. 959 * {@hide} 960 */ 961 static final int SCROLLBARS_INSET_MASK = 0x01000000; 962 963 /** 964 * Mask to check if the scrollbar style is inside or outside. 965 * {@hide} 966 */ 967 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 968 969 /** 970 * Mask for scrollbar style. 971 * {@hide} 972 */ 973 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 974 975 /** 976 * View flag indicating that the screen should remain on while the 977 * window containing this view is visible to the user. This effectively 978 * takes care of automatically setting the WindowManager's 979 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 980 */ 981 public static final int KEEP_SCREEN_ON = 0x04000000; 982 983 /** 984 * View flag indicating whether this view should have sound effects enabled 985 * for events such as clicking and touching. 986 */ 987 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 988 989 /** 990 * View flag indicating whether this view should have haptic feedback 991 * enabled for events such as long presses. 992 */ 993 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 994 995 /** 996 * <p>Indicates that the view hierarchy should stop saving state when 997 * it reaches this view. If state saving is initiated immediately at 998 * the view, it will be allowed. 999 * {@hide} 1000 */ 1001 static final int PARENT_SAVE_DISABLED = 0x20000000; 1002 1003 /** 1004 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 1005 * {@hide} 1006 */ 1007 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 1008 1009 /** 1010 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1011 * should add all focusable Views regardless if they are focusable in touch mode. 1012 */ 1013 public static final int FOCUSABLES_ALL = 0x00000000; 1014 1015 /** 1016 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1017 * should add only Views focusable in touch mode. 1018 */ 1019 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1020 1021 /** 1022 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1023 * item. 1024 */ 1025 public static final int FOCUS_BACKWARD = 0x00000001; 1026 1027 /** 1028 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1029 * item. 1030 */ 1031 public static final int FOCUS_FORWARD = 0x00000002; 1032 1033 /** 1034 * Use with {@link #focusSearch(int)}. Move focus to the left. 1035 */ 1036 public static final int FOCUS_LEFT = 0x00000011; 1037 1038 /** 1039 * Use with {@link #focusSearch(int)}. Move focus up. 1040 */ 1041 public static final int FOCUS_UP = 0x00000021; 1042 1043 /** 1044 * Use with {@link #focusSearch(int)}. Move focus to the right. 1045 */ 1046 public static final int FOCUS_RIGHT = 0x00000042; 1047 1048 /** 1049 * Use with {@link #focusSearch(int)}. Move focus down. 1050 */ 1051 public static final int FOCUS_DOWN = 0x00000082; 1052 1053 /** 1054 * Bits of {@link #getMeasuredWidthAndState()} and 1055 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1056 */ 1057 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1058 1059 /** 1060 * Bits of {@link #getMeasuredWidthAndState()} and 1061 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1062 */ 1063 public static final int MEASURED_STATE_MASK = 0xff000000; 1064 1065 /** 1066 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1067 * for functions that combine both width and height into a single int, 1068 * such as {@link #getMeasuredState()} and the childState argument of 1069 * {@link #resolveSizeAndState(int, int, int)}. 1070 */ 1071 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1072 1073 /** 1074 * Bit of {@link #getMeasuredWidthAndState()} and 1075 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1076 * is smaller that the space the view would like to have. 1077 */ 1078 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1079 1080 /** 1081 * Base View state sets 1082 */ 1083 // Singles 1084 /** 1085 * Indicates the view has no states set. States are used with 1086 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1087 * view depending on its state. 1088 * 1089 * @see android.graphics.drawable.Drawable 1090 * @see #getDrawableState() 1091 */ 1092 protected static final int[] EMPTY_STATE_SET; 1093 /** 1094 * Indicates the view is enabled. States are used with 1095 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1096 * view depending on its state. 1097 * 1098 * @see android.graphics.drawable.Drawable 1099 * @see #getDrawableState() 1100 */ 1101 protected static final int[] ENABLED_STATE_SET; 1102 /** 1103 * Indicates the view is focused. States are used with 1104 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1105 * view depending on its state. 1106 * 1107 * @see android.graphics.drawable.Drawable 1108 * @see #getDrawableState() 1109 */ 1110 protected static final int[] FOCUSED_STATE_SET; 1111 /** 1112 * Indicates the view is selected. States are used with 1113 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1114 * view depending on its state. 1115 * 1116 * @see android.graphics.drawable.Drawable 1117 * @see #getDrawableState() 1118 */ 1119 protected static final int[] SELECTED_STATE_SET; 1120 /** 1121 * Indicates the view is pressed. States are used with 1122 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1123 * view depending on its state. 1124 * 1125 * @see android.graphics.drawable.Drawable 1126 * @see #getDrawableState() 1127 */ 1128 protected static final int[] PRESSED_STATE_SET; 1129 /** 1130 * Indicates the view's window has focus. States are used with 1131 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1132 * view depending on its state. 1133 * 1134 * @see android.graphics.drawable.Drawable 1135 * @see #getDrawableState() 1136 */ 1137 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1138 // Doubles 1139 /** 1140 * Indicates the view is enabled and has the focus. 1141 * 1142 * @see #ENABLED_STATE_SET 1143 * @see #FOCUSED_STATE_SET 1144 */ 1145 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1146 /** 1147 * Indicates the view is enabled and selected. 1148 * 1149 * @see #ENABLED_STATE_SET 1150 * @see #SELECTED_STATE_SET 1151 */ 1152 protected static final int[] ENABLED_SELECTED_STATE_SET; 1153 /** 1154 * Indicates the view is enabled and that its window has focus. 1155 * 1156 * @see #ENABLED_STATE_SET 1157 * @see #WINDOW_FOCUSED_STATE_SET 1158 */ 1159 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1160 /** 1161 * Indicates the view is focused and selected. 1162 * 1163 * @see #FOCUSED_STATE_SET 1164 * @see #SELECTED_STATE_SET 1165 */ 1166 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1167 /** 1168 * Indicates the view has the focus and that its window has the focus. 1169 * 1170 * @see #FOCUSED_STATE_SET 1171 * @see #WINDOW_FOCUSED_STATE_SET 1172 */ 1173 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1174 /** 1175 * Indicates the view is selected and that its window has the focus. 1176 * 1177 * @see #SELECTED_STATE_SET 1178 * @see #WINDOW_FOCUSED_STATE_SET 1179 */ 1180 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1181 // Triples 1182 /** 1183 * Indicates the view is enabled, focused and selected. 1184 * 1185 * @see #ENABLED_STATE_SET 1186 * @see #FOCUSED_STATE_SET 1187 * @see #SELECTED_STATE_SET 1188 */ 1189 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1190 /** 1191 * Indicates the view is enabled, focused and its window has the focus. 1192 * 1193 * @see #ENABLED_STATE_SET 1194 * @see #FOCUSED_STATE_SET 1195 * @see #WINDOW_FOCUSED_STATE_SET 1196 */ 1197 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1198 /** 1199 * Indicates the view is enabled, selected and its window has the focus. 1200 * 1201 * @see #ENABLED_STATE_SET 1202 * @see #SELECTED_STATE_SET 1203 * @see #WINDOW_FOCUSED_STATE_SET 1204 */ 1205 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1206 /** 1207 * Indicates the view is focused, selected and its window has the focus. 1208 * 1209 * @see #FOCUSED_STATE_SET 1210 * @see #SELECTED_STATE_SET 1211 * @see #WINDOW_FOCUSED_STATE_SET 1212 */ 1213 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1214 /** 1215 * Indicates the view is enabled, focused, selected and its window 1216 * has the focus. 1217 * 1218 * @see #ENABLED_STATE_SET 1219 * @see #FOCUSED_STATE_SET 1220 * @see #SELECTED_STATE_SET 1221 * @see #WINDOW_FOCUSED_STATE_SET 1222 */ 1223 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1224 /** 1225 * Indicates the view is pressed and its window has the focus. 1226 * 1227 * @see #PRESSED_STATE_SET 1228 * @see #WINDOW_FOCUSED_STATE_SET 1229 */ 1230 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1231 /** 1232 * Indicates the view is pressed and selected. 1233 * 1234 * @see #PRESSED_STATE_SET 1235 * @see #SELECTED_STATE_SET 1236 */ 1237 protected static final int[] PRESSED_SELECTED_STATE_SET; 1238 /** 1239 * Indicates the view is pressed, selected and its window has the focus. 1240 * 1241 * @see #PRESSED_STATE_SET 1242 * @see #SELECTED_STATE_SET 1243 * @see #WINDOW_FOCUSED_STATE_SET 1244 */ 1245 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1246 /** 1247 * Indicates the view is pressed and focused. 1248 * 1249 * @see #PRESSED_STATE_SET 1250 * @see #FOCUSED_STATE_SET 1251 */ 1252 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1253 /** 1254 * Indicates the view is pressed, focused and its window has the focus. 1255 * 1256 * @see #PRESSED_STATE_SET 1257 * @see #FOCUSED_STATE_SET 1258 * @see #WINDOW_FOCUSED_STATE_SET 1259 */ 1260 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1261 /** 1262 * Indicates the view is pressed, focused and selected. 1263 * 1264 * @see #PRESSED_STATE_SET 1265 * @see #SELECTED_STATE_SET 1266 * @see #FOCUSED_STATE_SET 1267 */ 1268 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1269 /** 1270 * Indicates the view is pressed, focused, selected and its window has the focus. 1271 * 1272 * @see #PRESSED_STATE_SET 1273 * @see #FOCUSED_STATE_SET 1274 * @see #SELECTED_STATE_SET 1275 * @see #WINDOW_FOCUSED_STATE_SET 1276 */ 1277 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1278 /** 1279 * Indicates the view is pressed and enabled. 1280 * 1281 * @see #PRESSED_STATE_SET 1282 * @see #ENABLED_STATE_SET 1283 */ 1284 protected static final int[] PRESSED_ENABLED_STATE_SET; 1285 /** 1286 * Indicates the view is pressed, enabled and its window has the focus. 1287 * 1288 * @see #PRESSED_STATE_SET 1289 * @see #ENABLED_STATE_SET 1290 * @see #WINDOW_FOCUSED_STATE_SET 1291 */ 1292 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1293 /** 1294 * Indicates the view is pressed, enabled and selected. 1295 * 1296 * @see #PRESSED_STATE_SET 1297 * @see #ENABLED_STATE_SET 1298 * @see #SELECTED_STATE_SET 1299 */ 1300 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1301 /** 1302 * Indicates the view is pressed, enabled, selected and its window has the 1303 * focus. 1304 * 1305 * @see #PRESSED_STATE_SET 1306 * @see #ENABLED_STATE_SET 1307 * @see #SELECTED_STATE_SET 1308 * @see #WINDOW_FOCUSED_STATE_SET 1309 */ 1310 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1311 /** 1312 * Indicates the view is pressed, enabled and focused. 1313 * 1314 * @see #PRESSED_STATE_SET 1315 * @see #ENABLED_STATE_SET 1316 * @see #FOCUSED_STATE_SET 1317 */ 1318 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1319 /** 1320 * Indicates the view is pressed, enabled, focused and its window has the 1321 * focus. 1322 * 1323 * @see #PRESSED_STATE_SET 1324 * @see #ENABLED_STATE_SET 1325 * @see #FOCUSED_STATE_SET 1326 * @see #WINDOW_FOCUSED_STATE_SET 1327 */ 1328 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1329 /** 1330 * Indicates the view is pressed, enabled, focused and selected. 1331 * 1332 * @see #PRESSED_STATE_SET 1333 * @see #ENABLED_STATE_SET 1334 * @see #SELECTED_STATE_SET 1335 * @see #FOCUSED_STATE_SET 1336 */ 1337 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1338 /** 1339 * Indicates the view is pressed, enabled, focused, selected and its window 1340 * has the focus. 1341 * 1342 * @see #PRESSED_STATE_SET 1343 * @see #ENABLED_STATE_SET 1344 * @see #SELECTED_STATE_SET 1345 * @see #FOCUSED_STATE_SET 1346 * @see #WINDOW_FOCUSED_STATE_SET 1347 */ 1348 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1349 1350 /** 1351 * The order here is very important to {@link #getDrawableState()} 1352 */ 1353 private static final int[][] VIEW_STATE_SETS; 1354 1355 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1356 static final int VIEW_STATE_SELECTED = 1 << 1; 1357 static final int VIEW_STATE_FOCUSED = 1 << 2; 1358 static final int VIEW_STATE_ENABLED = 1 << 3; 1359 static final int VIEW_STATE_PRESSED = 1 << 4; 1360 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1361 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1362 static final int VIEW_STATE_HOVERED = 1 << 7; 1363 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1364 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1365 1366 static final int[] VIEW_STATE_IDS = new int[] { 1367 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1368 R.attr.state_selected, VIEW_STATE_SELECTED, 1369 R.attr.state_focused, VIEW_STATE_FOCUSED, 1370 R.attr.state_enabled, VIEW_STATE_ENABLED, 1371 R.attr.state_pressed, VIEW_STATE_PRESSED, 1372 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1373 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1374 R.attr.state_hovered, VIEW_STATE_HOVERED, 1375 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1376 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1377 }; 1378 1379 static { 1380 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1381 throw new IllegalStateException( 1382 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1383 } 1384 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1385 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1386 int viewState = R.styleable.ViewDrawableStates[i]; 1387 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1388 if (VIEW_STATE_IDS[j] == viewState) { 1389 orderedIds[i * 2] = viewState; 1390 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1391 } 1392 } 1393 } 1394 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1395 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1396 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1397 int numBits = Integer.bitCount(i); 1398 int[] set = new int[numBits]; 1399 int pos = 0; 1400 for (int j = 0; j < orderedIds.length; j += 2) { 1401 if ((i & orderedIds[j+1]) != 0) { 1402 set[pos++] = orderedIds[j]; 1403 } 1404 } 1405 VIEW_STATE_SETS[i] = set; 1406 } 1407 1408 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1409 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1410 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1411 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1412 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1413 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1414 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1415 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1416 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1417 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1418 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1420 | VIEW_STATE_FOCUSED]; 1421 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1422 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1423 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1424 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1425 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1426 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1427 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1428 | VIEW_STATE_ENABLED]; 1429 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1430 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1431 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1432 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1433 | VIEW_STATE_ENABLED]; 1434 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1435 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1436 | VIEW_STATE_ENABLED]; 1437 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1438 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1439 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1440 1441 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1442 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1443 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1444 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1445 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1446 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1448 | VIEW_STATE_PRESSED]; 1449 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1451 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1452 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1453 | VIEW_STATE_PRESSED]; 1454 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1455 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1456 | VIEW_STATE_PRESSED]; 1457 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1459 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1460 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1462 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1463 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1464 | VIEW_STATE_PRESSED]; 1465 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1467 | VIEW_STATE_PRESSED]; 1468 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1469 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1470 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1471 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1472 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1473 | VIEW_STATE_PRESSED]; 1474 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1475 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1476 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1477 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1479 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1480 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1481 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1482 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1483 | VIEW_STATE_PRESSED]; 1484 } 1485 1486 /** 1487 * Accessibility event types that are dispatched for text population. 1488 */ 1489 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1490 AccessibilityEvent.TYPE_VIEW_CLICKED 1491 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1492 | AccessibilityEvent.TYPE_VIEW_SELECTED 1493 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1494 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1495 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1496 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1497 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1498 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1499 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1500 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1501 1502 /** 1503 * Temporary Rect currently for use in setBackground(). This will probably 1504 * be extended in the future to hold our own class with more than just 1505 * a Rect. :) 1506 */ 1507 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1508 1509 /** 1510 * Map used to store views' tags. 1511 */ 1512 private SparseArray<Object> mKeyedTags; 1513 1514 /** 1515 * The next available accessibility id. 1516 */ 1517 private static int sNextAccessibilityViewId; 1518 1519 /** 1520 * The animation currently associated with this view. 1521 * @hide 1522 */ 1523 protected Animation mCurrentAnimation = null; 1524 1525 /** 1526 * Width as measured during measure pass. 1527 * {@hide} 1528 */ 1529 @ViewDebug.ExportedProperty(category = "measurement") 1530 int mMeasuredWidth; 1531 1532 /** 1533 * Height as measured during measure pass. 1534 * {@hide} 1535 */ 1536 @ViewDebug.ExportedProperty(category = "measurement") 1537 int mMeasuredHeight; 1538 1539 /** 1540 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1541 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1542 * its display list. This flag, used only when hw accelerated, allows us to clear the 1543 * flag while retaining this information until it's needed (at getDisplayList() time and 1544 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1545 * 1546 * {@hide} 1547 */ 1548 boolean mRecreateDisplayList = false; 1549 1550 /** 1551 * The view's identifier. 1552 * {@hide} 1553 * 1554 * @see #setId(int) 1555 * @see #getId() 1556 */ 1557 @ViewDebug.ExportedProperty(resolveId = true) 1558 int mID = NO_ID; 1559 1560 /** 1561 * The stable ID of this view for accessibility purposes. 1562 */ 1563 int mAccessibilityViewId = NO_ID; 1564 1565 private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 1566 1567 SendViewStateChangedAccessibilityEvent mSendViewStateChangedAccessibilityEvent; 1568 1569 /** 1570 * The view's tag. 1571 * {@hide} 1572 * 1573 * @see #setTag(Object) 1574 * @see #getTag() 1575 */ 1576 protected Object mTag; 1577 1578 private Scene mCurrentScene = null; 1579 1580 // for mPrivateFlags: 1581 /** {@hide} */ 1582 static final int PFLAG_WANTS_FOCUS = 0x00000001; 1583 /** {@hide} */ 1584 static final int PFLAG_FOCUSED = 0x00000002; 1585 /** {@hide} */ 1586 static final int PFLAG_SELECTED = 0x00000004; 1587 /** {@hide} */ 1588 static final int PFLAG_IS_ROOT_NAMESPACE = 0x00000008; 1589 /** {@hide} */ 1590 static final int PFLAG_HAS_BOUNDS = 0x00000010; 1591 /** {@hide} */ 1592 static final int PFLAG_DRAWN = 0x00000020; 1593 /** 1594 * When this flag is set, this view is running an animation on behalf of its 1595 * children and should therefore not cancel invalidate requests, even if they 1596 * lie outside of this view's bounds. 1597 * 1598 * {@hide} 1599 */ 1600 static final int PFLAG_DRAW_ANIMATION = 0x00000040; 1601 /** {@hide} */ 1602 static final int PFLAG_SKIP_DRAW = 0x00000080; 1603 /** {@hide} */ 1604 static final int PFLAG_ONLY_DRAWS_BACKGROUND = 0x00000100; 1605 /** {@hide} */ 1606 static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1607 /** {@hide} */ 1608 static final int PFLAG_DRAWABLE_STATE_DIRTY = 0x00000400; 1609 /** {@hide} */ 1610 static final int PFLAG_MEASURED_DIMENSION_SET = 0x00000800; 1611 /** {@hide} */ 1612 static final int PFLAG_FORCE_LAYOUT = 0x00001000; 1613 /** {@hide} */ 1614 static final int PFLAG_LAYOUT_REQUIRED = 0x00002000; 1615 1616 private static final int PFLAG_PRESSED = 0x00004000; 1617 1618 /** {@hide} */ 1619 static final int PFLAG_DRAWING_CACHE_VALID = 0x00008000; 1620 /** 1621 * Flag used to indicate that this view should be drawn once more (and only once 1622 * more) after its animation has completed. 1623 * {@hide} 1624 */ 1625 static final int PFLAG_ANIMATION_STARTED = 0x00010000; 1626 1627 private static final int PFLAG_SAVE_STATE_CALLED = 0x00020000; 1628 1629 /** 1630 * Indicates that the View returned true when onSetAlpha() was called and that 1631 * the alpha must be restored. 1632 * {@hide} 1633 */ 1634 static final int PFLAG_ALPHA_SET = 0x00040000; 1635 1636 /** 1637 * Set by {@link #setScrollContainer(boolean)}. 1638 */ 1639 static final int PFLAG_SCROLL_CONTAINER = 0x00080000; 1640 1641 /** 1642 * Set by {@link #setScrollContainer(boolean)}. 1643 */ 1644 static final int PFLAG_SCROLL_CONTAINER_ADDED = 0x00100000; 1645 1646 /** 1647 * View flag indicating whether this view was invalidated (fully or partially.) 1648 * 1649 * @hide 1650 */ 1651 static final int PFLAG_DIRTY = 0x00200000; 1652 1653 /** 1654 * View flag indicating whether this view was invalidated by an opaque 1655 * invalidate request. 1656 * 1657 * @hide 1658 */ 1659 static final int PFLAG_DIRTY_OPAQUE = 0x00400000; 1660 1661 /** 1662 * Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}. 1663 * 1664 * @hide 1665 */ 1666 static final int PFLAG_DIRTY_MASK = 0x00600000; 1667 1668 /** 1669 * Indicates whether the background is opaque. 1670 * 1671 * @hide 1672 */ 1673 static final int PFLAG_OPAQUE_BACKGROUND = 0x00800000; 1674 1675 /** 1676 * Indicates whether the scrollbars are opaque. 1677 * 1678 * @hide 1679 */ 1680 static final int PFLAG_OPAQUE_SCROLLBARS = 0x01000000; 1681 1682 /** 1683 * Indicates whether the view is opaque. 1684 * 1685 * @hide 1686 */ 1687 static final int PFLAG_OPAQUE_MASK = 0x01800000; 1688 1689 /** 1690 * Indicates a prepressed state; 1691 * the short time between ACTION_DOWN and recognizing 1692 * a 'real' press. Prepressed is used to recognize quick taps 1693 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1694 * 1695 * @hide 1696 */ 1697 private static final int PFLAG_PREPRESSED = 0x02000000; 1698 1699 /** 1700 * Indicates whether the view is temporarily detached. 1701 * 1702 * @hide 1703 */ 1704 static final int PFLAG_CANCEL_NEXT_UP_EVENT = 0x04000000; 1705 1706 /** 1707 * Indicates that we should awaken scroll bars once attached 1708 * 1709 * @hide 1710 */ 1711 private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1712 1713 /** 1714 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1715 * @hide 1716 */ 1717 private static final int PFLAG_HOVERED = 0x10000000; 1718 1719 /** 1720 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1721 * for transform operations 1722 * 1723 * @hide 1724 */ 1725 private static final int PFLAG_PIVOT_EXPLICITLY_SET = 0x20000000; 1726 1727 /** {@hide} */ 1728 static final int PFLAG_ACTIVATED = 0x40000000; 1729 1730 /** 1731 * Indicates that this view was specifically invalidated, not just dirtied because some 1732 * child view was invalidated. The flag is used to determine when we need to recreate 1733 * a view's display list (as opposed to just returning a reference to its existing 1734 * display list). 1735 * 1736 * @hide 1737 */ 1738 static final int PFLAG_INVALIDATED = 0x80000000; 1739 1740 /** 1741 * Masks for mPrivateFlags2, as generated by dumpFlags(): 1742 * 1743 * -------|-------|-------|-------| 1744 * PFLAG2_TEXT_ALIGNMENT_FLAGS[0] 1745 * PFLAG2_TEXT_DIRECTION_FLAGS[0] 1746 * 1 PFLAG2_DRAG_CAN_ACCEPT 1747 * 1 PFLAG2_DRAG_HOVERED 1748 * 1 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT 1749 * 11 PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1750 * 1 1 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT 1751 * 11 PFLAG2_LAYOUT_DIRECTION_MASK 1752 * 11 1 PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 1753 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL 1754 * 1 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT 1755 * 1 1 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT 1756 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED 1757 * 11 PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK 1758 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[1] 1759 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[2] 1760 * 11 PFLAG2_TEXT_DIRECTION_FLAGS[3] 1761 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[4] 1762 * 1 1 PFLAG2_TEXT_DIRECTION_FLAGS[5] 1763 * 111 PFLAG2_TEXT_DIRECTION_MASK 1764 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED 1765 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT 1766 * 111 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK 1767 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[1] 1768 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[2] 1769 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[3] 1770 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[4] 1771 * 1 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[5] 1772 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[6] 1773 * 111 PFLAG2_TEXT_ALIGNMENT_MASK 1774 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED 1775 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT 1776 * 111 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK 1777 * 11 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK 1778 * 1 PFLAG2_HAS_TRANSIENT_STATE 1779 * 1 PFLAG2_ACCESSIBILITY_FOCUSED 1780 * 1 PFLAG2_ACCESSIBILITY_STATE_CHANGED 1781 * 1 PFLAG2_VIEW_QUICK_REJECTED 1782 * 1 PFLAG2_PADDING_RESOLVED 1783 * -------|-------|-------|-------| 1784 */ 1785 1786 /** 1787 * Indicates that this view has reported that it can accept the current drag's content. 1788 * Cleared when the drag operation concludes. 1789 * @hide 1790 */ 1791 static final int PFLAG2_DRAG_CAN_ACCEPT = 0x00000001; 1792 1793 /** 1794 * Indicates that this view is currently directly under the drag location in a 1795 * drag-and-drop operation involving content that it can accept. Cleared when 1796 * the drag exits the view, or when the drag operation concludes. 1797 * @hide 1798 */ 1799 static final int PFLAG2_DRAG_HOVERED = 0x00000002; 1800 1801 /** 1802 * Horizontal layout direction of this view is from Left to Right. 1803 * Use with {@link #setLayoutDirection}. 1804 */ 1805 public static final int LAYOUT_DIRECTION_LTR = LayoutDirection.LTR; 1806 1807 /** 1808 * Horizontal layout direction of this view is from Right to Left. 1809 * Use with {@link #setLayoutDirection}. 1810 */ 1811 public static final int LAYOUT_DIRECTION_RTL = LayoutDirection.RTL; 1812 1813 /** 1814 * Horizontal layout direction of this view is inherited from its parent. 1815 * Use with {@link #setLayoutDirection}. 1816 */ 1817 public static final int LAYOUT_DIRECTION_INHERIT = LayoutDirection.INHERIT; 1818 1819 /** 1820 * Horizontal layout direction of this view is from deduced from the default language 1821 * script for the locale. Use with {@link #setLayoutDirection}. 1822 */ 1823 public static final int LAYOUT_DIRECTION_LOCALE = LayoutDirection.LOCALE; 1824 1825 /** 1826 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1827 * @hide 1828 */ 1829 static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2; 1830 1831 /** 1832 * Mask for use with private flags indicating bits used for horizontal layout direction. 1833 * @hide 1834 */ 1835 static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1836 1837 /** 1838 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1839 * right-to-left direction. 1840 * @hide 1841 */ 1842 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1843 1844 /** 1845 * Indicates whether the view horizontal layout direction has been resolved. 1846 * @hide 1847 */ 1848 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1849 1850 /** 1851 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1852 * @hide 1853 */ 1854 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C 1855 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1856 1857 /* 1858 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1859 * flag value. 1860 * @hide 1861 */ 1862 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1863 LAYOUT_DIRECTION_LTR, 1864 LAYOUT_DIRECTION_RTL, 1865 LAYOUT_DIRECTION_INHERIT, 1866 LAYOUT_DIRECTION_LOCALE 1867 }; 1868 1869 /** 1870 * Default horizontal layout direction. 1871 */ 1872 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1873 1874 /** 1875 * Default horizontal layout direction. 1876 * @hide 1877 */ 1878 static final int LAYOUT_DIRECTION_RESOLVED_DEFAULT = LAYOUT_DIRECTION_LTR; 1879 1880 /** 1881 * Indicates that the view is tracking some sort of transient state 1882 * that the app should not need to be aware of, but that the framework 1883 * should take special care to preserve. 1884 * 1885 * @hide 1886 */ 1887 static final int PFLAG2_HAS_TRANSIENT_STATE = 0x1 << 22; 1888 1889 /** 1890 * Text direction is inherited thru {@link ViewGroup} 1891 */ 1892 public static final int TEXT_DIRECTION_INHERIT = 0; 1893 1894 /** 1895 * Text direction is using "first strong algorithm". The first strong directional character 1896 * determines the paragraph direction. If there is no strong directional character, the 1897 * paragraph direction is the view's resolved layout direction. 1898 */ 1899 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1900 1901 /** 1902 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1903 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1904 * If there are neither, the paragraph direction is the view's resolved layout direction. 1905 */ 1906 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1907 1908 /** 1909 * Text direction is forced to LTR. 1910 */ 1911 public static final int TEXT_DIRECTION_LTR = 3; 1912 1913 /** 1914 * Text direction is forced to RTL. 1915 */ 1916 public static final int TEXT_DIRECTION_RTL = 4; 1917 1918 /** 1919 * Text direction is coming from the system Locale. 1920 */ 1921 public static final int TEXT_DIRECTION_LOCALE = 5; 1922 1923 /** 1924 * Default text direction is inherited 1925 */ 1926 private static final int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1927 1928 /** 1929 * Default resolved text direction 1930 * @hide 1931 */ 1932 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_FIRST_STRONG; 1933 1934 /** 1935 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1936 * @hide 1937 */ 1938 static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6; 1939 1940 /** 1941 * Mask for use with private flags indicating bits used for text direction. 1942 * @hide 1943 */ 1944 static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007 1945 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1946 1947 /** 1948 * Array of text direction flags for mapping attribute "textDirection" to correct 1949 * flag value. 1950 * @hide 1951 */ 1952 private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = { 1953 TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1954 TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1955 TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1956 TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1957 TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1958 TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1959 }; 1960 1961 /** 1962 * Indicates whether the view text direction has been resolved. 1963 * @hide 1964 */ 1965 static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008 1966 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1967 1968 /** 1969 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1970 * @hide 1971 */ 1972 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1973 1974 /** 1975 * Mask for use with private flags indicating bits used for resolved text direction. 1976 * @hide 1977 */ 1978 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 1979 << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1980 1981 /** 1982 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1983 * @hide 1984 */ 1985 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT = 1986 TEXT_DIRECTION_RESOLVED_DEFAULT << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1987 1988 /* 1989 * Default text alignment. The text alignment of this View is inherited from its parent. 1990 * Use with {@link #setTextAlignment(int)} 1991 */ 1992 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1993 1994 /** 1995 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1996 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1997 * 1998 * Use with {@link #setTextAlignment(int)} 1999 */ 2000 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 2001 2002 /** 2003 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 2004 * 2005 * Use with {@link #setTextAlignment(int)} 2006 */ 2007 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 2008 2009 /** 2010 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 2011 * 2012 * Use with {@link #setTextAlignment(int)} 2013 */ 2014 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2015 2016 /** 2017 * Center the paragraph, e.g. ALIGN_CENTER. 2018 * 2019 * Use with {@link #setTextAlignment(int)} 2020 */ 2021 public static final int TEXT_ALIGNMENT_CENTER = 4; 2022 2023 /** 2024 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2025 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2026 * 2027 * Use with {@link #setTextAlignment(int)} 2028 */ 2029 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2030 2031 /** 2032 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2033 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2034 * 2035 * Use with {@link #setTextAlignment(int)} 2036 */ 2037 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2038 2039 /** 2040 * Default text alignment is inherited 2041 */ 2042 private static final int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2043 2044 /** 2045 * Default resolved text alignment 2046 * @hide 2047 */ 2048 static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2049 2050 /** 2051 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2052 * @hide 2053 */ 2054 static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13; 2055 2056 /** 2057 * Mask for use with private flags indicating bits used for text alignment. 2058 * @hide 2059 */ 2060 static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2061 2062 /** 2063 * Array of text direction flags for mapping attribute "textAlignment" to correct 2064 * flag value. 2065 * @hide 2066 */ 2067 private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = { 2068 TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2069 TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2070 TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2071 TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2072 TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2073 TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2074 TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 2075 }; 2076 2077 /** 2078 * Indicates whether the view text alignment has been resolved. 2079 * @hide 2080 */ 2081 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2082 2083 /** 2084 * Bit shift to get the resolved text alignment. 2085 * @hide 2086 */ 2087 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2088 2089 /** 2090 * Mask for use with private flags indicating bits used for text alignment. 2091 * @hide 2092 */ 2093 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 2094 << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2095 2096 /** 2097 * Indicates whether if the view text alignment has been resolved to gravity 2098 */ 2099 private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2100 TEXT_ALIGNMENT_RESOLVED_DEFAULT << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2101 2102 // Accessiblity constants for mPrivateFlags2 2103 2104 /** 2105 * Shift for the bits in {@link #mPrivateFlags2} related to the 2106 * "importantForAccessibility" attribute. 2107 */ 2108 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2109 2110 /** 2111 * Automatically determine whether a view is important for accessibility. 2112 */ 2113 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2114 2115 /** 2116 * The view is important for accessibility. 2117 */ 2118 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2119 2120 /** 2121 * The view is not important for accessibility. 2122 */ 2123 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2124 2125 /** 2126 * The default whether the view is important for accessibility. 2127 */ 2128 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2129 2130 /** 2131 * Mask for obtainig the bits which specify how to determine 2132 * whether a view is important for accessibility. 2133 */ 2134 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2135 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2136 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2137 2138 /** 2139 * Flag indicating whether a view has accessibility focus. 2140 */ 2141 static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x04000000; 2142 2143 /** 2144 * Flag whether the accessibility state of the subtree rooted at this view changed. 2145 */ 2146 static final int PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED = 0x08000000; 2147 2148 /** 2149 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2150 * is used to check whether later changes to the view's transform should invalidate the 2151 * view to force the quickReject test to run again. 2152 */ 2153 static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000; 2154 2155 /** 2156 * Flag indicating that start/end padding has been resolved into left/right padding 2157 * for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()} 2158 * and checked by {@link #measure(int, int)} to determine if padding needs to be resolved 2159 * during measurement. In some special cases this is required such as when an adapter-based 2160 * view measures prospective children without attaching them to a window. 2161 */ 2162 static final int PFLAG2_PADDING_RESOLVED = 0x20000000; 2163 2164 /** 2165 * Flag indicating that the start/end drawables has been resolved into left/right ones. 2166 */ 2167 static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000; 2168 2169 /** 2170 * Group of bits indicating that RTL properties resolution is done. 2171 */ 2172 static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED | 2173 PFLAG2_TEXT_DIRECTION_RESOLVED | 2174 PFLAG2_TEXT_ALIGNMENT_RESOLVED | 2175 PFLAG2_PADDING_RESOLVED | 2176 PFLAG2_DRAWABLE_RESOLVED; 2177 2178 // There are a couple of flags left in mPrivateFlags2 2179 2180 /* End of masks for mPrivateFlags2 */ 2181 2182 /* Masks for mPrivateFlags3 */ 2183 2184 /** 2185 * Flag indicating that view has a transform animation set on it. This is used to track whether 2186 * an animation is cleared between successive frames, in order to tell the associated 2187 * DisplayList to clear its animation matrix. 2188 */ 2189 static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1; 2190 2191 /** 2192 * Flag indicating that view has an alpha animation set on it. This is used to track whether an 2193 * animation is cleared between successive frames, in order to tell the associated 2194 * DisplayList to restore its alpha value. 2195 */ 2196 static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2; 2197 2198 /** 2199 * Flag indicating that the view has been through at least one layout since it 2200 * was last attached to a window. 2201 */ 2202 static final int PFLAG3_IS_LAID_OUT = 0x4; 2203 2204 /** 2205 * Flag indicating that a call to measure() was skipped and should be done 2206 * instead when layout() is invoked. 2207 */ 2208 static final int PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT = 0x8; 2209 2210 2211 /* End of masks for mPrivateFlags3 */ 2212 2213 static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED; 2214 2215 /** 2216 * Always allow a user to over-scroll this view, provided it is a 2217 * view that can scroll. 2218 * 2219 * @see #getOverScrollMode() 2220 * @see #setOverScrollMode(int) 2221 */ 2222 public static final int OVER_SCROLL_ALWAYS = 0; 2223 2224 /** 2225 * Allow a user to over-scroll this view only if the content is large 2226 * enough to meaningfully scroll, provided it is a view that can scroll. 2227 * 2228 * @see #getOverScrollMode() 2229 * @see #setOverScrollMode(int) 2230 */ 2231 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2232 2233 /** 2234 * Never allow a user to over-scroll this view. 2235 * 2236 * @see #getOverScrollMode() 2237 * @see #setOverScrollMode(int) 2238 */ 2239 public static final int OVER_SCROLL_NEVER = 2; 2240 2241 /** 2242 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2243 * requested the system UI (status bar) to be visible (the default). 2244 * 2245 * @see #setSystemUiVisibility(int) 2246 */ 2247 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2248 2249 /** 2250 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2251 * system UI to enter an unobtrusive "low profile" mode. 2252 * 2253 * <p>This is for use in games, book readers, video players, or any other 2254 * "immersive" application where the usual system chrome is deemed too distracting. 2255 * 2256 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2257 * 2258 * @see #setSystemUiVisibility(int) 2259 */ 2260 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2261 2262 /** 2263 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2264 * system navigation be temporarily hidden. 2265 * 2266 * <p>This is an even less obtrusive state than that called for by 2267 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2268 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2269 * those to disappear. This is useful (in conjunction with the 2270 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2271 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2272 * window flags) for displaying content using every last pixel on the display. 2273 * 2274 * <p>There is a limitation: because navigation controls are so important, the least user 2275 * interaction will cause them to reappear immediately. When this happens, both 2276 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2277 * so that both elements reappear at the same time. 2278 * 2279 * @see #setSystemUiVisibility(int) 2280 */ 2281 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2282 2283 /** 2284 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2285 * into the normal fullscreen mode so that its content can take over the screen 2286 * while still allowing the user to interact with the application. 2287 * 2288 * <p>This has the same visual effect as 2289 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2290 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2291 * meaning that non-critical screen decorations (such as the status bar) will be 2292 * hidden while the user is in the View's window, focusing the experience on 2293 * that content. Unlike the window flag, if you are using ActionBar in 2294 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2295 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2296 * hide the action bar. 2297 * 2298 * <p>This approach to going fullscreen is best used over the window flag when 2299 * it is a transient state -- that is, the application does this at certain 2300 * points in its user interaction where it wants to allow the user to focus 2301 * on content, but not as a continuous state. For situations where the application 2302 * would like to simply stay full screen the entire time (such as a game that 2303 * wants to take over the screen), the 2304 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2305 * is usually a better approach. The state set here will be removed by the system 2306 * in various situations (such as the user moving to another application) like 2307 * the other system UI states. 2308 * 2309 * <p>When using this flag, the application should provide some easy facility 2310 * for the user to go out of it. A common example would be in an e-book 2311 * reader, where tapping on the screen brings back whatever screen and UI 2312 * decorations that had been hidden while the user was immersed in reading 2313 * the book. 2314 * 2315 * @see #setSystemUiVisibility(int) 2316 */ 2317 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2318 2319 /** 2320 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2321 * flags, we would like a stable view of the content insets given to 2322 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2323 * will always represent the worst case that the application can expect 2324 * as a continuous state. In the stock Android UI this is the space for 2325 * the system bar, nav bar, and status bar, but not more transient elements 2326 * such as an input method. 2327 * 2328 * The stable layout your UI sees is based on the system UI modes you can 2329 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2330 * then you will get a stable layout for changes of the 2331 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2332 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2333 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2334 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2335 * with a stable layout. (Note that you should avoid using 2336 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2337 * 2338 * If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN} 2339 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2340 * then a hidden status bar will be considered a "stable" state for purposes 2341 * here. This allows your UI to continually hide the status bar, while still 2342 * using the system UI flags to hide the action bar while still retaining 2343 * a stable layout. Note that changing the window fullscreen flag will never 2344 * provide a stable layout for a clean transition. 2345 * 2346 * <p>If you are using ActionBar in 2347 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2348 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2349 * insets it adds to those given to the application. 2350 */ 2351 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2352 2353 /** 2354 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2355 * to be layed out as if it has requested 2356 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2357 * allows it to avoid artifacts when switching in and out of that mode, at 2358 * the expense that some of its user interface may be covered by screen 2359 * decorations when they are shown. You can perform layout of your inner 2360 * UI elements to account for the navigation system UI through the 2361 * {@link #fitSystemWindows(Rect)} method. 2362 */ 2363 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2364 2365 /** 2366 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2367 * to be layed out as if it has requested 2368 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2369 * allows it to avoid artifacts when switching in and out of that mode, at 2370 * the expense that some of its user interface may be covered by screen 2371 * decorations when they are shown. You can perform layout of your inner 2372 * UI elements to account for non-fullscreen system UI through the 2373 * {@link #fitSystemWindows(Rect)} method. 2374 */ 2375 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2376 2377 /** 2378 * Flag for {@link #setSystemUiVisibility(int)}: View would like to receive touch events 2379 * when hiding the status bar with {@link #SYSTEM_UI_FLAG_FULLSCREEN} and/or hiding the 2380 * navigation bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} instead of having the system 2381 * clear these flags upon interaction. The system may compensate by temporarily overlaying 2382 * semi-transparent system bars while also delivering the event. 2383 */ 2384 public static final int SYSTEM_UI_FLAG_ALLOW_TRANSIENT = 0x00000800; 2385 2386 /** 2387 * Flag for {@link #setSystemUiVisibility(int)}: View would like the status bar to have 2388 * transparency. 2389 * 2390 * <p>The transparency request may be denied if the bar is in another mode with a specific 2391 * style, like {@link #SYSTEM_UI_FLAG_ALLOW_TRANSIENT transient mode}. 2392 */ 2393 public static final int SYSTEM_UI_FLAG_TRANSPARENT_STATUS = 0x00001000; 2394 2395 /** 2396 * Flag for {@link #setSystemUiVisibility(int)}: View would like the navigation bar to have 2397 * transparency. 2398 * 2399 * <p>The transparency request may be denied if the bar is in another mode with a specific 2400 * style, like {@link #SYSTEM_UI_FLAG_ALLOW_TRANSIENT transient mode}. 2401 */ 2402 public static final int SYSTEM_UI_FLAG_TRANSPARENT_NAVIGATION = 0x00002000; 2403 2404 /** 2405 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2406 */ 2407 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2408 2409 /** 2410 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2411 */ 2412 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2413 2414 /** 2415 * @hide 2416 * 2417 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2418 * out of the public fields to keep the undefined bits out of the developer's way. 2419 * 2420 * Flag to make the status bar not expandable. Unless you also 2421 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2422 */ 2423 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2424 2425 /** 2426 * @hide 2427 * 2428 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2429 * out of the public fields to keep the undefined bits out of the developer's way. 2430 * 2431 * Flag to hide notification icons and scrolling ticker text. 2432 */ 2433 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2434 2435 /** 2436 * @hide 2437 * 2438 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2439 * out of the public fields to keep the undefined bits out of the developer's way. 2440 * 2441 * Flag to disable incoming notification alerts. This will not block 2442 * icons, but it will block sound, vibrating and other visual or aural notifications. 2443 */ 2444 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2445 2446 /** 2447 * @hide 2448 * 2449 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2450 * out of the public fields to keep the undefined bits out of the developer's way. 2451 * 2452 * Flag to hide only the scrolling ticker. Note that 2453 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2454 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2455 */ 2456 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2457 2458 /** 2459 * @hide 2460 * 2461 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2462 * out of the public fields to keep the undefined bits out of the developer's way. 2463 * 2464 * Flag to hide the center system info area. 2465 */ 2466 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2467 2468 /** 2469 * @hide 2470 * 2471 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2472 * out of the public fields to keep the undefined bits out of the developer's way. 2473 * 2474 * Flag to hide only the home button. Don't use this 2475 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2476 */ 2477 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2478 2479 /** 2480 * @hide 2481 * 2482 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2483 * out of the public fields to keep the undefined bits out of the developer's way. 2484 * 2485 * Flag to hide only the back button. Don't use this 2486 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2487 */ 2488 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2489 2490 /** 2491 * @hide 2492 * 2493 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2494 * out of the public fields to keep the undefined bits out of the developer's way. 2495 * 2496 * Flag to hide only the clock. You might use this if your activity has 2497 * its own clock making the status bar's clock redundant. 2498 */ 2499 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2500 2501 /** 2502 * @hide 2503 * 2504 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2505 * out of the public fields to keep the undefined bits out of the developer's way. 2506 * 2507 * Flag to hide only the recent apps button. Don't use this 2508 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2509 */ 2510 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2511 2512 /** 2513 * @hide 2514 * 2515 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2516 * out of the public fields to keep the undefined bits out of the developer's way. 2517 * 2518 * Flag to disable the global search gesture. Don't use this 2519 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2520 */ 2521 public static final int STATUS_BAR_DISABLE_SEARCH = 0x02000000; 2522 2523 /** 2524 * @hide 2525 * 2526 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2527 * out of the public fields to keep the undefined bits out of the developer's way. 2528 * 2529 * Flag to specify that the status bar is displayed in transient mode. 2530 */ 2531 public static final int STATUS_BAR_TRANSIENT = 0x04000000; 2532 2533 /** 2534 * @hide 2535 * 2536 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2537 * out of the public fields to keep the undefined bits out of the developer's way. 2538 * 2539 * Flag to specify that the navigation bar is displayed in transient mode. 2540 */ 2541 public static final int NAVIGATION_BAR_TRANSIENT = 0x08000000; 2542 2543 /** 2544 * @hide 2545 * 2546 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2547 * out of the public fields to keep the undefined bits out of the developer's way. 2548 * 2549 * Flag to specify that the hidden status bar would like to be shown. 2550 */ 2551 public static final int STATUS_BAR_UNHIDE = 0x10000000; 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 specify that the hidden navigation bar would like to be shown. 2560 */ 2561 public static final int NAVIGATION_BAR_UNHIDE = 0x20000000; 2562 2563 /** 2564 * @hide 2565 */ 2566 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2567 2568 /** 2569 * These are the system UI flags that can be cleared by events outside 2570 * of an application. Currently this is just the ability to tap on the 2571 * screen while hiding the navigation bar to have it return. 2572 * @hide 2573 */ 2574 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2575 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2576 | SYSTEM_UI_FLAG_FULLSCREEN; 2577 2578 /** 2579 * Flags that can impact the layout in relation to system UI. 2580 */ 2581 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2582 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2583 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2584 2585 /** 2586 * Find views that render the specified text. 2587 * 2588 * @see #findViewsWithText(ArrayList, CharSequence, int) 2589 */ 2590 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2591 2592 /** 2593 * Find find views that contain the specified content description. 2594 * 2595 * @see #findViewsWithText(ArrayList, CharSequence, int) 2596 */ 2597 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2598 2599 /** 2600 * Find views that contain {@link AccessibilityNodeProvider}. Such 2601 * a View is a root of virtual view hierarchy and may contain the searched 2602 * text. If this flag is set Views with providers are automatically 2603 * added and it is a responsibility of the client to call the APIs of 2604 * the provider to determine whether the virtual tree rooted at this View 2605 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2606 * represeting the virtual views with this text. 2607 * 2608 * @see #findViewsWithText(ArrayList, CharSequence, int) 2609 * 2610 * @hide 2611 */ 2612 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2613 2614 /** 2615 * The undefined cursor position. 2616 * 2617 * @hide 2618 */ 2619 public static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1; 2620 2621 /** 2622 * Indicates that the screen has changed state and is now off. 2623 * 2624 * @see #onScreenStateChanged(int) 2625 */ 2626 public static final int SCREEN_STATE_OFF = 0x0; 2627 2628 /** 2629 * Indicates that the screen has changed state and is now on. 2630 * 2631 * @see #onScreenStateChanged(int) 2632 */ 2633 public static final int SCREEN_STATE_ON = 0x1; 2634 2635 /** 2636 * Controls the over-scroll mode for this view. 2637 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2638 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2639 * and {@link #OVER_SCROLL_NEVER}. 2640 */ 2641 private int mOverScrollMode; 2642 2643 /** 2644 * The parent this view is attached to. 2645 * {@hide} 2646 * 2647 * @see #getParent() 2648 */ 2649 protected ViewParent mParent; 2650 2651 /** 2652 * {@hide} 2653 */ 2654 AttachInfo mAttachInfo; 2655 2656 /** 2657 * {@hide} 2658 */ 2659 @ViewDebug.ExportedProperty(flagMapping = { 2660 @ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT, 2661 name = "FORCE_LAYOUT"), 2662 @ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED, 2663 name = "LAYOUT_REQUIRED"), 2664 @ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID, 2665 name = "DRAWING_CACHE_INVALID", outputIf = false), 2666 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true), 2667 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false), 2668 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2669 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY") 2670 }) 2671 int mPrivateFlags; 2672 int mPrivateFlags2; 2673 int mPrivateFlags3; 2674 2675 /** 2676 * This view's request for the visibility of the status bar. 2677 * @hide 2678 */ 2679 @ViewDebug.ExportedProperty(flagMapping = { 2680 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2681 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2682 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2683 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2684 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2685 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2686 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2687 equals = SYSTEM_UI_FLAG_VISIBLE, 2688 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2689 }) 2690 int mSystemUiVisibility; 2691 2692 /** 2693 * Reference count for transient state. 2694 * @see #setHasTransientState(boolean) 2695 */ 2696 int mTransientStateCount = 0; 2697 2698 /** 2699 * Count of how many windows this view has been attached to. 2700 */ 2701 int mWindowAttachCount; 2702 2703 /** 2704 * The layout parameters associated with this view and used by the parent 2705 * {@link android.view.ViewGroup} to determine how this view should be 2706 * laid out. 2707 * {@hide} 2708 */ 2709 protected ViewGroup.LayoutParams mLayoutParams; 2710 2711 /** 2712 * The view flags hold various views states. 2713 * {@hide} 2714 */ 2715 @ViewDebug.ExportedProperty 2716 int mViewFlags; 2717 2718 static class TransformationInfo { 2719 /** 2720 * The transform matrix for the View. This transform is calculated internally 2721 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2722 * is used by default. Do *not* use this variable directly; instead call 2723 * getMatrix(), which will automatically recalculate the matrix if necessary 2724 * to get the correct matrix based on the latest rotation and scale properties. 2725 */ 2726 private final Matrix mMatrix = new Matrix(); 2727 2728 /** 2729 * The transform matrix for the View. This transform is calculated internally 2730 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2731 * is used by default. Do *not* use this variable directly; instead call 2732 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2733 * to get the correct matrix based on the latest rotation and scale properties. 2734 */ 2735 private Matrix mInverseMatrix; 2736 2737 /** 2738 * An internal variable that tracks whether we need to recalculate the 2739 * transform matrix, based on whether the rotation or scaleX/Y properties 2740 * have changed since the matrix was last calculated. 2741 */ 2742 boolean mMatrixDirty = false; 2743 2744 /** 2745 * An internal variable that tracks whether we need to recalculate the 2746 * transform matrix, based on whether the rotation or scaleX/Y properties 2747 * have changed since the matrix was last calculated. 2748 */ 2749 private boolean mInverseMatrixDirty = true; 2750 2751 /** 2752 * A variable that tracks whether we need to recalculate the 2753 * transform matrix, based on whether the rotation or scaleX/Y properties 2754 * have changed since the matrix was last calculated. This variable 2755 * is only valid after a call to updateMatrix() or to a function that 2756 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2757 */ 2758 private boolean mMatrixIsIdentity = true; 2759 2760 /** 2761 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2762 */ 2763 private Camera mCamera = null; 2764 2765 /** 2766 * This matrix is used when computing the matrix for 3D rotations. 2767 */ 2768 private Matrix matrix3D = null; 2769 2770 /** 2771 * These prev values are used to recalculate a centered pivot point when necessary. The 2772 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2773 * set), so thes values are only used then as well. 2774 */ 2775 private int mPrevWidth = -1; 2776 private int mPrevHeight = -1; 2777 2778 /** 2779 * The degrees rotation around the vertical axis through the pivot point. 2780 */ 2781 @ViewDebug.ExportedProperty 2782 float mRotationY = 0f; 2783 2784 /** 2785 * The degrees rotation around the horizontal axis through the pivot point. 2786 */ 2787 @ViewDebug.ExportedProperty 2788 float mRotationX = 0f; 2789 2790 /** 2791 * The degrees rotation around the pivot point. 2792 */ 2793 @ViewDebug.ExportedProperty 2794 float mRotation = 0f; 2795 2796 /** 2797 * The amount of translation of the object away from its left property (post-layout). 2798 */ 2799 @ViewDebug.ExportedProperty 2800 float mTranslationX = 0f; 2801 2802 /** 2803 * The amount of translation of the object away from its top property (post-layout). 2804 */ 2805 @ViewDebug.ExportedProperty 2806 float mTranslationY = 0f; 2807 2808 /** 2809 * The amount of scale in the x direction around the pivot point. A 2810 * value of 1 means no scaling is applied. 2811 */ 2812 @ViewDebug.ExportedProperty 2813 float mScaleX = 1f; 2814 2815 /** 2816 * The amount of scale in the y direction around the pivot point. A 2817 * value of 1 means no scaling is applied. 2818 */ 2819 @ViewDebug.ExportedProperty 2820 float mScaleY = 1f; 2821 2822 /** 2823 * The x location of the point around which the view is rotated and scaled. 2824 */ 2825 @ViewDebug.ExportedProperty 2826 float mPivotX = 0f; 2827 2828 /** 2829 * The y location of the point around which the view is rotated and scaled. 2830 */ 2831 @ViewDebug.ExportedProperty 2832 float mPivotY = 0f; 2833 2834 /** 2835 * The opacity of the View. This is a value from 0 to 1, where 0 means 2836 * completely transparent and 1 means completely opaque. 2837 */ 2838 @ViewDebug.ExportedProperty 2839 float mAlpha = 1f; 2840 } 2841 2842 TransformationInfo mTransformationInfo; 2843 2844 /** 2845 * Current clip bounds. to which all drawing of this view are constrained. 2846 */ 2847 private Rect mClipBounds = null; 2848 2849 private boolean mLastIsOpaque; 2850 2851 /** 2852 * Convenience value to check for float values that are close enough to zero to be considered 2853 * zero. 2854 */ 2855 private static final float NONZERO_EPSILON = .001f; 2856 2857 /** 2858 * The distance in pixels from the left edge of this view's parent 2859 * to the left edge of this view. 2860 * {@hide} 2861 */ 2862 @ViewDebug.ExportedProperty(category = "layout") 2863 protected int mLeft; 2864 /** 2865 * The distance in pixels from the left edge of this view's parent 2866 * to the right edge of this view. 2867 * {@hide} 2868 */ 2869 @ViewDebug.ExportedProperty(category = "layout") 2870 protected int mRight; 2871 /** 2872 * The distance in pixels from the top edge of this view's parent 2873 * to the top edge of this view. 2874 * {@hide} 2875 */ 2876 @ViewDebug.ExportedProperty(category = "layout") 2877 protected int mTop; 2878 /** 2879 * The distance in pixels from the top edge of this view's parent 2880 * to the bottom edge of this view. 2881 * {@hide} 2882 */ 2883 @ViewDebug.ExportedProperty(category = "layout") 2884 protected int mBottom; 2885 2886 /** 2887 * The offset, in pixels, by which the content of this view is scrolled 2888 * horizontally. 2889 * {@hide} 2890 */ 2891 @ViewDebug.ExportedProperty(category = "scrolling") 2892 protected int mScrollX; 2893 /** 2894 * The offset, in pixels, by which the content of this view is scrolled 2895 * vertically. 2896 * {@hide} 2897 */ 2898 @ViewDebug.ExportedProperty(category = "scrolling") 2899 protected int mScrollY; 2900 2901 /** 2902 * The left padding in pixels, that is the distance in pixels between the 2903 * left edge of this view and the left edge of its content. 2904 * {@hide} 2905 */ 2906 @ViewDebug.ExportedProperty(category = "padding") 2907 protected int mPaddingLeft = 0; 2908 /** 2909 * The right padding in pixels, that is the distance in pixels between the 2910 * right edge of this view and the right edge of its content. 2911 * {@hide} 2912 */ 2913 @ViewDebug.ExportedProperty(category = "padding") 2914 protected int mPaddingRight = 0; 2915 /** 2916 * The top padding in pixels, that is the distance in pixels between the 2917 * top edge of this view and the top edge of its content. 2918 * {@hide} 2919 */ 2920 @ViewDebug.ExportedProperty(category = "padding") 2921 protected int mPaddingTop; 2922 /** 2923 * The bottom padding in pixels, that is the distance in pixels between the 2924 * bottom edge of this view and the bottom edge of its content. 2925 * {@hide} 2926 */ 2927 @ViewDebug.ExportedProperty(category = "padding") 2928 protected int mPaddingBottom; 2929 2930 /** 2931 * The layout insets in pixels, that is the distance in pixels between the 2932 * visible edges of this view its bounds. 2933 */ 2934 private Insets mLayoutInsets; 2935 2936 /** 2937 * Briefly describes the view and is primarily used for accessibility support. 2938 */ 2939 private CharSequence mContentDescription; 2940 2941 /** 2942 * Specifies the id of a view for which this view serves as a label for 2943 * accessibility purposes. 2944 */ 2945 private int mLabelForId = View.NO_ID; 2946 2947 /** 2948 * Predicate for matching labeled view id with its label for 2949 * accessibility purposes. 2950 */ 2951 private MatchLabelForPredicate mMatchLabelForPredicate; 2952 2953 /** 2954 * Predicate for matching a view by its id. 2955 */ 2956 private MatchIdPredicate mMatchIdPredicate; 2957 2958 /** 2959 * Cache the paddingRight set by the user to append to the scrollbar's size. 2960 * 2961 * @hide 2962 */ 2963 @ViewDebug.ExportedProperty(category = "padding") 2964 protected int mUserPaddingRight; 2965 2966 /** 2967 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2968 * 2969 * @hide 2970 */ 2971 @ViewDebug.ExportedProperty(category = "padding") 2972 protected int mUserPaddingBottom; 2973 2974 /** 2975 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2976 * 2977 * @hide 2978 */ 2979 @ViewDebug.ExportedProperty(category = "padding") 2980 protected int mUserPaddingLeft; 2981 2982 /** 2983 * Cache the paddingStart set by the user to append to the scrollbar's size. 2984 * 2985 */ 2986 @ViewDebug.ExportedProperty(category = "padding") 2987 int mUserPaddingStart; 2988 2989 /** 2990 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2991 * 2992 */ 2993 @ViewDebug.ExportedProperty(category = "padding") 2994 int mUserPaddingEnd; 2995 2996 /** 2997 * Cache initial left padding. 2998 * 2999 * @hide 3000 */ 3001 int mUserPaddingLeftInitial; 3002 3003 /** 3004 * Cache initial right padding. 3005 * 3006 * @hide 3007 */ 3008 int mUserPaddingRightInitial; 3009 3010 /** 3011 * Default undefined padding 3012 */ 3013 private static final int UNDEFINED_PADDING = Integer.MIN_VALUE; 3014 3015 /** 3016 * @hide 3017 */ 3018 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 3019 /** 3020 * @hide 3021 */ 3022 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 3023 3024 private LongSparseLongArray mMeasureCache; 3025 3026 @ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_") 3027 private Drawable mBackground; 3028 3029 private int mBackgroundResource; 3030 private boolean mBackgroundSizeChanged; 3031 3032 static class ListenerInfo { 3033 /** 3034 * Listener used to dispatch focus change events. 3035 * This field should be made private, so it is hidden from the SDK. 3036 * {@hide} 3037 */ 3038 protected OnFocusChangeListener mOnFocusChangeListener; 3039 3040 /** 3041 * Listeners for layout change events. 3042 */ 3043 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 3044 3045 /** 3046 * Listeners for attach events. 3047 */ 3048 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 3049 3050 /** 3051 * Listener used to dispatch click events. 3052 * This field should be made private, so it is hidden from the SDK. 3053 * {@hide} 3054 */ 3055 public OnClickListener mOnClickListener; 3056 3057 /** 3058 * Listener used to dispatch long click events. 3059 * This field should be made private, so it is hidden from the SDK. 3060 * {@hide} 3061 */ 3062 protected OnLongClickListener mOnLongClickListener; 3063 3064 /** 3065 * Listener used to build the context menu. 3066 * This field should be made private, so it is hidden from the SDK. 3067 * {@hide} 3068 */ 3069 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 3070 3071 private OnKeyListener mOnKeyListener; 3072 3073 private OnTouchListener mOnTouchListener; 3074 3075 private OnHoverListener mOnHoverListener; 3076 3077 private OnGenericMotionListener mOnGenericMotionListener; 3078 3079 private OnDragListener mOnDragListener; 3080 3081 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 3082 } 3083 3084 ListenerInfo mListenerInfo; 3085 3086 /** 3087 * The application environment this view lives in. 3088 * This field should be made private, so it is hidden from the SDK. 3089 * {@hide} 3090 */ 3091 protected Context mContext; 3092 3093 private final Resources mResources; 3094 3095 private ScrollabilityCache mScrollCache; 3096 3097 private int[] mDrawableState = null; 3098 3099 /** 3100 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 3101 * the user may specify which view to go to next. 3102 */ 3103 private int mNextFocusLeftId = View.NO_ID; 3104 3105 /** 3106 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 3107 * the user may specify which view to go to next. 3108 */ 3109 private int mNextFocusRightId = View.NO_ID; 3110 3111 /** 3112 * When this view has focus and the next focus is {@link #FOCUS_UP}, 3113 * the user may specify which view to go to next. 3114 */ 3115 private int mNextFocusUpId = View.NO_ID; 3116 3117 /** 3118 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 3119 * the user may specify which view to go to next. 3120 */ 3121 private int mNextFocusDownId = View.NO_ID; 3122 3123 /** 3124 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 3125 * the user may specify which view to go to next. 3126 */ 3127 int mNextFocusForwardId = View.NO_ID; 3128 3129 private CheckForLongPress mPendingCheckForLongPress; 3130 private CheckForTap mPendingCheckForTap = null; 3131 private PerformClick mPerformClick; 3132 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 3133 3134 private UnsetPressedState mUnsetPressedState; 3135 3136 /** 3137 * Whether the long press's action has been invoked. The tap's action is invoked on the 3138 * up event while a long press is invoked as soon as the long press duration is reached, so 3139 * a long press could be performed before the tap is checked, in which case the tap's action 3140 * should not be invoked. 3141 */ 3142 private boolean mHasPerformedLongPress; 3143 3144 /** 3145 * The minimum height of the view. We'll try our best to have the height 3146 * of this view to at least this amount. 3147 */ 3148 @ViewDebug.ExportedProperty(category = "measurement") 3149 private int mMinHeight; 3150 3151 /** 3152 * The minimum width of the view. We'll try our best to have the width 3153 * of this view to at least this amount. 3154 */ 3155 @ViewDebug.ExportedProperty(category = "measurement") 3156 private int mMinWidth; 3157 3158 /** 3159 * The delegate to handle touch events that are physically in this view 3160 * but should be handled by another view. 3161 */ 3162 private TouchDelegate mTouchDelegate = null; 3163 3164 /** 3165 * Solid color to use as a background when creating the drawing cache. Enables 3166 * the cache to use 16 bit bitmaps instead of 32 bit. 3167 */ 3168 private int mDrawingCacheBackgroundColor = 0; 3169 3170 /** 3171 * Special tree observer used when mAttachInfo is null. 3172 */ 3173 private ViewTreeObserver mFloatingTreeObserver; 3174 3175 /** 3176 * Cache the touch slop from the context that created the view. 3177 */ 3178 private int mTouchSlop; 3179 3180 /** 3181 * Object that handles automatic animation of view properties. 3182 */ 3183 private ViewPropertyAnimator mAnimator = null; 3184 3185 /** 3186 * Flag indicating that a drag can cross window boundaries. When 3187 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 3188 * with this flag set, all visible applications will be able to participate 3189 * in the drag operation and receive the dragged content. 3190 * 3191 * @hide 3192 */ 3193 public static final int DRAG_FLAG_GLOBAL = 1; 3194 3195 /** 3196 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3197 */ 3198 private float mVerticalScrollFactor; 3199 3200 /** 3201 * Position of the vertical scroll bar. 3202 */ 3203 private int mVerticalScrollbarPosition; 3204 3205 /** 3206 * Position the scroll bar at the default position as determined by the system. 3207 */ 3208 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3209 3210 /** 3211 * Position the scroll bar along the left edge. 3212 */ 3213 public static final int SCROLLBAR_POSITION_LEFT = 1; 3214 3215 /** 3216 * Position the scroll bar along the right edge. 3217 */ 3218 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3219 3220 /** 3221 * Indicates that the view does not have a layer. 3222 * 3223 * @see #getLayerType() 3224 * @see #setLayerType(int, android.graphics.Paint) 3225 * @see #LAYER_TYPE_SOFTWARE 3226 * @see #LAYER_TYPE_HARDWARE 3227 */ 3228 public static final int LAYER_TYPE_NONE = 0; 3229 3230 /** 3231 * <p>Indicates that the view has a software layer. A software layer is backed 3232 * by a bitmap and causes the view to be rendered using Android's software 3233 * rendering pipeline, even if hardware acceleration is enabled.</p> 3234 * 3235 * <p>Software layers have various usages:</p> 3236 * <p>When the application is not using hardware acceleration, a software layer 3237 * is useful to apply a specific color filter and/or blending mode and/or 3238 * translucency to a view and all its children.</p> 3239 * <p>When the application is using hardware acceleration, a software layer 3240 * is useful to render drawing primitives not supported by the hardware 3241 * accelerated pipeline. It can also be used to cache a complex view tree 3242 * into a texture and reduce the complexity of drawing operations. For instance, 3243 * when animating a complex view tree with a translation, a software layer can 3244 * be used to render the view tree only once.</p> 3245 * <p>Software layers should be avoided when the affected view tree updates 3246 * often. Every update will require to re-render the software layer, which can 3247 * potentially be slow (particularly when hardware acceleration is turned on 3248 * since the layer will have to be uploaded into a hardware texture after every 3249 * update.)</p> 3250 * 3251 * @see #getLayerType() 3252 * @see #setLayerType(int, android.graphics.Paint) 3253 * @see #LAYER_TYPE_NONE 3254 * @see #LAYER_TYPE_HARDWARE 3255 */ 3256 public static final int LAYER_TYPE_SOFTWARE = 1; 3257 3258 /** 3259 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3260 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3261 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3262 * rendering pipeline, but only if hardware acceleration is turned on for the 3263 * view hierarchy. When hardware acceleration is turned off, hardware layers 3264 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3265 * 3266 * <p>A hardware layer is useful to apply a specific color filter and/or 3267 * blending mode and/or translucency to a view and all its children.</p> 3268 * <p>A hardware layer can be used to cache a complex view tree into a 3269 * texture and reduce the complexity of drawing operations. For instance, 3270 * when animating a complex view tree with a translation, a hardware layer can 3271 * be used to render the view tree only once.</p> 3272 * <p>A hardware layer can also be used to increase the rendering quality when 3273 * rotation transformations are applied on a view. It can also be used to 3274 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3275 * 3276 * @see #getLayerType() 3277 * @see #setLayerType(int, android.graphics.Paint) 3278 * @see #LAYER_TYPE_NONE 3279 * @see #LAYER_TYPE_SOFTWARE 3280 */ 3281 public static final int LAYER_TYPE_HARDWARE = 2; 3282 3283 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3284 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3285 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3286 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3287 }) 3288 int mLayerType = LAYER_TYPE_NONE; 3289 Paint mLayerPaint; 3290 Rect mLocalDirtyRect; 3291 private HardwareLayer mHardwareLayer; 3292 3293 /** 3294 * Set to true when drawing cache is enabled and cannot be created. 3295 * 3296 * @hide 3297 */ 3298 public boolean mCachingFailed; 3299 private Bitmap mDrawingCache; 3300 private Bitmap mUnscaledDrawingCache; 3301 3302 DisplayList mDisplayList; 3303 3304 /** 3305 * Set to true when the view is sending hover accessibility events because it 3306 * is the innermost hovered view. 3307 */ 3308 private boolean mSendingHoverAccessibilityEvents; 3309 3310 /** 3311 * Delegate for injecting accessibility functionality. 3312 */ 3313 AccessibilityDelegate mAccessibilityDelegate; 3314 3315 /** 3316 * The view's overlay layer. Developers get a reference to the overlay via getOverlay() 3317 * and add/remove objects to/from the overlay directly through the Overlay methods. 3318 */ 3319 ViewOverlay mOverlay; 3320 3321 /** 3322 * Consistency verifier for debugging purposes. 3323 * @hide 3324 */ 3325 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3326 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3327 new InputEventConsistencyVerifier(this, 0) : null; 3328 3329 private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); 3330 3331 /** 3332 * Simple constructor to use when creating a view from code. 3333 * 3334 * @param context The Context the view is running in, through which it can 3335 * access the current theme, resources, etc. 3336 */ 3337 public View(Context context) { 3338 mContext = context; 3339 mResources = context != null ? context.getResources() : null; 3340 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3341 // Set some flags defaults 3342 mPrivateFlags2 = 3343 (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) | 3344 (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) | 3345 (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) | 3346 (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) | 3347 (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) | 3348 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3349 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3350 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3351 mUserPaddingStart = UNDEFINED_PADDING; 3352 mUserPaddingEnd = UNDEFINED_PADDING; 3353 3354 if (!sUseBrokenMakeMeasureSpec && context != null && 3355 context.getApplicationInfo().targetSdkVersion <= JELLY_BEAN_MR1) { 3356 // Older apps may need this compatibility hack for measurement. 3357 sUseBrokenMakeMeasureSpec = true; 3358 } 3359 } 3360 3361 /** 3362 * Constructor that is called when inflating a view from XML. This is called 3363 * when a view is being constructed from an XML file, supplying attributes 3364 * that were specified in the XML file. This version uses a default style of 3365 * 0, so the only attribute values applied are those in the Context's Theme 3366 * and the given AttributeSet. 3367 * 3368 * <p> 3369 * The method onFinishInflate() will be called after all children have been 3370 * added. 3371 * 3372 * @param context The Context the view is running in, through which it can 3373 * access the current theme, resources, etc. 3374 * @param attrs The attributes of the XML tag that is inflating the view. 3375 * @see #View(Context, AttributeSet, int) 3376 */ 3377 public View(Context context, AttributeSet attrs) { 3378 this(context, attrs, 0); 3379 } 3380 3381 /** 3382 * Perform inflation from XML and apply a class-specific base style. This 3383 * constructor of View allows subclasses to use their own base style when 3384 * they are inflating. For example, a Button class's constructor would call 3385 * this version of the super class constructor and supply 3386 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3387 * the theme's button style to modify all of the base view attributes (in 3388 * particular its background) as well as the Button class's attributes. 3389 * 3390 * @param context The Context the view is running in, through which it can 3391 * access the current theme, resources, etc. 3392 * @param attrs The attributes of the XML tag that is inflating the view. 3393 * @param defStyleAttr An attribute in the current theme that contains a 3394 * reference to a style resource to apply to this view. If 0, no 3395 * default style will be applied. 3396 * @see #View(Context, AttributeSet) 3397 */ 3398 public View(Context context, AttributeSet attrs, int defStyleAttr) { 3399 this(context); 3400 3401 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3402 defStyleAttr, 0); 3403 3404 Drawable background = null; 3405 3406 int leftPadding = -1; 3407 int topPadding = -1; 3408 int rightPadding = -1; 3409 int bottomPadding = -1; 3410 int startPadding = UNDEFINED_PADDING; 3411 int endPadding = UNDEFINED_PADDING; 3412 3413 int padding = -1; 3414 3415 int viewFlagValues = 0; 3416 int viewFlagMasks = 0; 3417 3418 boolean setScrollContainer = false; 3419 3420 int x = 0; 3421 int y = 0; 3422 3423 float tx = 0; 3424 float ty = 0; 3425 float rotation = 0; 3426 float rotationX = 0; 3427 float rotationY = 0; 3428 float sx = 1f; 3429 float sy = 1f; 3430 boolean transformSet = false; 3431 3432 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3433 int overScrollMode = mOverScrollMode; 3434 boolean initializeScrollbars = false; 3435 3436 boolean leftPaddingDefined = false; 3437 boolean rightPaddingDefined = false; 3438 boolean startPaddingDefined = false; 3439 boolean endPaddingDefined = false; 3440 3441 final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; 3442 3443 final int N = a.getIndexCount(); 3444 for (int i = 0; i < N; i++) { 3445 int attr = a.getIndex(i); 3446 switch (attr) { 3447 case com.android.internal.R.styleable.View_background: 3448 background = a.getDrawable(attr); 3449 break; 3450 case com.android.internal.R.styleable.View_padding: 3451 padding = a.getDimensionPixelSize(attr, -1); 3452 mUserPaddingLeftInitial = padding; 3453 mUserPaddingRightInitial = padding; 3454 leftPaddingDefined = true; 3455 rightPaddingDefined = true; 3456 break; 3457 case com.android.internal.R.styleable.View_paddingLeft: 3458 leftPadding = a.getDimensionPixelSize(attr, -1); 3459 mUserPaddingLeftInitial = leftPadding; 3460 leftPaddingDefined = true; 3461 break; 3462 case com.android.internal.R.styleable.View_paddingTop: 3463 topPadding = a.getDimensionPixelSize(attr, -1); 3464 break; 3465 case com.android.internal.R.styleable.View_paddingRight: 3466 rightPadding = a.getDimensionPixelSize(attr, -1); 3467 mUserPaddingRightInitial = rightPadding; 3468 rightPaddingDefined = true; 3469 break; 3470 case com.android.internal.R.styleable.View_paddingBottom: 3471 bottomPadding = a.getDimensionPixelSize(attr, -1); 3472 break; 3473 case com.android.internal.R.styleable.View_paddingStart: 3474 startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3475 startPaddingDefined = (startPadding != UNDEFINED_PADDING); 3476 break; 3477 case com.android.internal.R.styleable.View_paddingEnd: 3478 endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3479 endPaddingDefined = (endPadding != UNDEFINED_PADDING); 3480 break; 3481 case com.android.internal.R.styleable.View_scrollX: 3482 x = a.getDimensionPixelOffset(attr, 0); 3483 break; 3484 case com.android.internal.R.styleable.View_scrollY: 3485 y = a.getDimensionPixelOffset(attr, 0); 3486 break; 3487 case com.android.internal.R.styleable.View_alpha: 3488 setAlpha(a.getFloat(attr, 1f)); 3489 break; 3490 case com.android.internal.R.styleable.View_transformPivotX: 3491 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3492 break; 3493 case com.android.internal.R.styleable.View_transformPivotY: 3494 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3495 break; 3496 case com.android.internal.R.styleable.View_translationX: 3497 tx = a.getDimensionPixelOffset(attr, 0); 3498 transformSet = true; 3499 break; 3500 case com.android.internal.R.styleable.View_translationY: 3501 ty = a.getDimensionPixelOffset(attr, 0); 3502 transformSet = true; 3503 break; 3504 case com.android.internal.R.styleable.View_rotation: 3505 rotation = a.getFloat(attr, 0); 3506 transformSet = true; 3507 break; 3508 case com.android.internal.R.styleable.View_rotationX: 3509 rotationX = a.getFloat(attr, 0); 3510 transformSet = true; 3511 break; 3512 case com.android.internal.R.styleable.View_rotationY: 3513 rotationY = a.getFloat(attr, 0); 3514 transformSet = true; 3515 break; 3516 case com.android.internal.R.styleable.View_scaleX: 3517 sx = a.getFloat(attr, 1f); 3518 transformSet = true; 3519 break; 3520 case com.android.internal.R.styleable.View_scaleY: 3521 sy = a.getFloat(attr, 1f); 3522 transformSet = true; 3523 break; 3524 case com.android.internal.R.styleable.View_id: 3525 mID = a.getResourceId(attr, NO_ID); 3526 break; 3527 case com.android.internal.R.styleable.View_tag: 3528 mTag = a.getText(attr); 3529 break; 3530 case com.android.internal.R.styleable.View_fitsSystemWindows: 3531 if (a.getBoolean(attr, false)) { 3532 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3533 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3534 } 3535 break; 3536 case com.android.internal.R.styleable.View_focusable: 3537 if (a.getBoolean(attr, false)) { 3538 viewFlagValues |= FOCUSABLE; 3539 viewFlagMasks |= FOCUSABLE_MASK; 3540 } 3541 break; 3542 case com.android.internal.R.styleable.View_focusableInTouchMode: 3543 if (a.getBoolean(attr, false)) { 3544 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3545 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3546 } 3547 break; 3548 case com.android.internal.R.styleable.View_clickable: 3549 if (a.getBoolean(attr, false)) { 3550 viewFlagValues |= CLICKABLE; 3551 viewFlagMasks |= CLICKABLE; 3552 } 3553 break; 3554 case com.android.internal.R.styleable.View_longClickable: 3555 if (a.getBoolean(attr, false)) { 3556 viewFlagValues |= LONG_CLICKABLE; 3557 viewFlagMasks |= LONG_CLICKABLE; 3558 } 3559 break; 3560 case com.android.internal.R.styleable.View_saveEnabled: 3561 if (!a.getBoolean(attr, true)) { 3562 viewFlagValues |= SAVE_DISABLED; 3563 viewFlagMasks |= SAVE_DISABLED_MASK; 3564 } 3565 break; 3566 case com.android.internal.R.styleable.View_duplicateParentState: 3567 if (a.getBoolean(attr, false)) { 3568 viewFlagValues |= DUPLICATE_PARENT_STATE; 3569 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3570 } 3571 break; 3572 case com.android.internal.R.styleable.View_visibility: 3573 final int visibility = a.getInt(attr, 0); 3574 if (visibility != 0) { 3575 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3576 viewFlagMasks |= VISIBILITY_MASK; 3577 } 3578 break; 3579 case com.android.internal.R.styleable.View_layoutDirection: 3580 // Clear any layout direction flags (included resolved bits) already set 3581 mPrivateFlags2 &= 3582 ~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK); 3583 // Set the layout direction flags depending on the value of the attribute 3584 final int layoutDirection = a.getInt(attr, -1); 3585 final int value = (layoutDirection != -1) ? 3586 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3587 mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT); 3588 break; 3589 case com.android.internal.R.styleable.View_drawingCacheQuality: 3590 final int cacheQuality = a.getInt(attr, 0); 3591 if (cacheQuality != 0) { 3592 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3593 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3594 } 3595 break; 3596 case com.android.internal.R.styleable.View_contentDescription: 3597 setContentDescription(a.getString(attr)); 3598 break; 3599 case com.android.internal.R.styleable.View_labelFor: 3600 setLabelFor(a.getResourceId(attr, NO_ID)); 3601 break; 3602 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3603 if (!a.getBoolean(attr, true)) { 3604 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3605 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3606 } 3607 break; 3608 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3609 if (!a.getBoolean(attr, true)) { 3610 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3611 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3612 } 3613 break; 3614 case R.styleable.View_scrollbars: 3615 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3616 if (scrollbars != SCROLLBARS_NONE) { 3617 viewFlagValues |= scrollbars; 3618 viewFlagMasks |= SCROLLBARS_MASK; 3619 initializeScrollbars = true; 3620 } 3621 break; 3622 //noinspection deprecation 3623 case R.styleable.View_fadingEdge: 3624 if (targetSdkVersion >= ICE_CREAM_SANDWICH) { 3625 // Ignore the attribute starting with ICS 3626 break; 3627 } 3628 // With builds < ICS, fall through and apply fading edges 3629 case R.styleable.View_requiresFadingEdge: 3630 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3631 if (fadingEdge != FADING_EDGE_NONE) { 3632 viewFlagValues |= fadingEdge; 3633 viewFlagMasks |= FADING_EDGE_MASK; 3634 initializeFadingEdge(a); 3635 } 3636 break; 3637 case R.styleable.View_scrollbarStyle: 3638 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3639 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3640 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3641 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3642 } 3643 break; 3644 case R.styleable.View_isScrollContainer: 3645 setScrollContainer = true; 3646 if (a.getBoolean(attr, false)) { 3647 setScrollContainer(true); 3648 } 3649 break; 3650 case com.android.internal.R.styleable.View_keepScreenOn: 3651 if (a.getBoolean(attr, false)) { 3652 viewFlagValues |= KEEP_SCREEN_ON; 3653 viewFlagMasks |= KEEP_SCREEN_ON; 3654 } 3655 break; 3656 case R.styleable.View_filterTouchesWhenObscured: 3657 if (a.getBoolean(attr, false)) { 3658 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3659 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3660 } 3661 break; 3662 case R.styleable.View_nextFocusLeft: 3663 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3664 break; 3665 case R.styleable.View_nextFocusRight: 3666 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3667 break; 3668 case R.styleable.View_nextFocusUp: 3669 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3670 break; 3671 case R.styleable.View_nextFocusDown: 3672 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3673 break; 3674 case R.styleable.View_nextFocusForward: 3675 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3676 break; 3677 case R.styleable.View_minWidth: 3678 mMinWidth = a.getDimensionPixelSize(attr, 0); 3679 break; 3680 case R.styleable.View_minHeight: 3681 mMinHeight = a.getDimensionPixelSize(attr, 0); 3682 break; 3683 case R.styleable.View_onClick: 3684 if (context.isRestricted()) { 3685 throw new IllegalStateException("The android:onClick attribute cannot " 3686 + "be used within a restricted context"); 3687 } 3688 3689 final String handlerName = a.getString(attr); 3690 if (handlerName != null) { 3691 setOnClickListener(new OnClickListener() { 3692 private Method mHandler; 3693 3694 public void onClick(View v) { 3695 if (mHandler == null) { 3696 try { 3697 mHandler = getContext().getClass().getMethod(handlerName, 3698 View.class); 3699 } catch (NoSuchMethodException e) { 3700 int id = getId(); 3701 String idText = id == NO_ID ? "" : " with id '" 3702 + getContext().getResources().getResourceEntryName( 3703 id) + "'"; 3704 throw new IllegalStateException("Could not find a method " + 3705 handlerName + "(View) in the activity " 3706 + getContext().getClass() + " for onClick handler" 3707 + " on view " + View.this.getClass() + idText, e); 3708 } 3709 } 3710 3711 try { 3712 mHandler.invoke(getContext(), View.this); 3713 } catch (IllegalAccessException e) { 3714 throw new IllegalStateException("Could not execute non " 3715 + "public method of the activity", e); 3716 } catch (InvocationTargetException e) { 3717 throw new IllegalStateException("Could not execute " 3718 + "method of the activity", e); 3719 } 3720 } 3721 }); 3722 } 3723 break; 3724 case R.styleable.View_overScrollMode: 3725 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3726 break; 3727 case R.styleable.View_verticalScrollbarPosition: 3728 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3729 break; 3730 case R.styleable.View_layerType: 3731 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3732 break; 3733 case R.styleable.View_textDirection: 3734 // Clear any text direction flag already set 3735 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 3736 // Set the text direction flags depending on the value of the attribute 3737 final int textDirection = a.getInt(attr, -1); 3738 if (textDirection != -1) { 3739 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection]; 3740 } 3741 break; 3742 case R.styleable.View_textAlignment: 3743 // Clear any text alignment flag already set 3744 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 3745 // Set the text alignment flag depending on the value of the attribute 3746 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3747 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment]; 3748 break; 3749 case R.styleable.View_importantForAccessibility: 3750 setImportantForAccessibility(a.getInt(attr, 3751 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3752 break; 3753 } 3754 } 3755 3756 setOverScrollMode(overScrollMode); 3757 3758 // Cache start/end user padding as we cannot fully resolve padding here (we dont have yet 3759 // the resolved layout direction). Those cached values will be used later during padding 3760 // resolution. 3761 mUserPaddingStart = startPadding; 3762 mUserPaddingEnd = endPadding; 3763 3764 if (background != null) { 3765 setBackground(background); 3766 } 3767 3768 if (padding >= 0) { 3769 leftPadding = padding; 3770 topPadding = padding; 3771 rightPadding = padding; 3772 bottomPadding = padding; 3773 mUserPaddingLeftInitial = padding; 3774 mUserPaddingRightInitial = padding; 3775 } 3776 3777 if (isRtlCompatibilityMode()) { 3778 // RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case. 3779 // left / right padding are used if defined (meaning here nothing to do). If they are not 3780 // defined and start / end padding are defined (e.g. in Frameworks resources), then we use 3781 // start / end and resolve them as left / right (layout direction is not taken into account). 3782 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3783 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3784 // defined. 3785 if (!leftPaddingDefined && startPaddingDefined) { 3786 leftPadding = startPadding; 3787 } 3788 mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial; 3789 if (!rightPaddingDefined && endPaddingDefined) { 3790 rightPadding = endPadding; 3791 } 3792 mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial; 3793 } else { 3794 // Jelly Bean MR1 and after case: if start/end defined, they will override any left/right 3795 // values defined. Otherwise, left /right values are used. 3796 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3797 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3798 // defined. 3799 final boolean hasRelativePadding = startPaddingDefined || endPaddingDefined; 3800 3801 if (leftPaddingDefined && !hasRelativePadding) { 3802 mUserPaddingLeftInitial = leftPadding; 3803 } 3804 if (rightPaddingDefined && !hasRelativePadding) { 3805 mUserPaddingRightInitial = rightPadding; 3806 } 3807 } 3808 3809 internalSetPadding( 3810 mUserPaddingLeftInitial, 3811 topPadding >= 0 ? topPadding : mPaddingTop, 3812 mUserPaddingRightInitial, 3813 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3814 3815 if (viewFlagMasks != 0) { 3816 setFlags(viewFlagValues, viewFlagMasks); 3817 } 3818 3819 if (initializeScrollbars) { 3820 initializeScrollbars(a); 3821 } 3822 3823 a.recycle(); 3824 3825 // Needs to be called after mViewFlags is set 3826 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3827 recomputePadding(); 3828 } 3829 3830 if (x != 0 || y != 0) { 3831 scrollTo(x, y); 3832 } 3833 3834 if (transformSet) { 3835 setTranslationX(tx); 3836 setTranslationY(ty); 3837 setRotation(rotation); 3838 setRotationX(rotationX); 3839 setRotationY(rotationY); 3840 setScaleX(sx); 3841 setScaleY(sy); 3842 } 3843 3844 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3845 setScrollContainer(true); 3846 } 3847 3848 computeOpaqueFlags(); 3849 } 3850 3851 /** 3852 * Non-public constructor for use in testing 3853 */ 3854 View() { 3855 mResources = null; 3856 } 3857 3858 public String toString() { 3859 StringBuilder out = new StringBuilder(128); 3860 out.append(getClass().getName()); 3861 out.append('{'); 3862 out.append(Integer.toHexString(System.identityHashCode(this))); 3863 out.append(' '); 3864 switch (mViewFlags&VISIBILITY_MASK) { 3865 case VISIBLE: out.append('V'); break; 3866 case INVISIBLE: out.append('I'); break; 3867 case GONE: out.append('G'); break; 3868 default: out.append('.'); break; 3869 } 3870 out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.'); 3871 out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.'); 3872 out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D'); 3873 out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.'); 3874 out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.'); 3875 out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.'); 3876 out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.'); 3877 out.append(' '); 3878 out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.'); 3879 out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.'); 3880 out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.'); 3881 if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) { 3882 out.append('p'); 3883 } else { 3884 out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.'); 3885 } 3886 out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.'); 3887 out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.'); 3888 out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.'); 3889 out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.'); 3890 out.append(' '); 3891 out.append(mLeft); 3892 out.append(','); 3893 out.append(mTop); 3894 out.append('-'); 3895 out.append(mRight); 3896 out.append(','); 3897 out.append(mBottom); 3898 final int id = getId(); 3899 if (id != NO_ID) { 3900 out.append(" #"); 3901 out.append(Integer.toHexString(id)); 3902 final Resources r = mResources; 3903 if (id != 0 && r != null) { 3904 try { 3905 String pkgname; 3906 switch (id&0xff000000) { 3907 case 0x7f000000: 3908 pkgname="app"; 3909 break; 3910 case 0x01000000: 3911 pkgname="android"; 3912 break; 3913 default: 3914 pkgname = r.getResourcePackageName(id); 3915 break; 3916 } 3917 String typename = r.getResourceTypeName(id); 3918 String entryname = r.getResourceEntryName(id); 3919 out.append(" "); 3920 out.append(pkgname); 3921 out.append(":"); 3922 out.append(typename); 3923 out.append("/"); 3924 out.append(entryname); 3925 } catch (Resources.NotFoundException e) { 3926 } 3927 } 3928 } 3929 out.append("}"); 3930 return out.toString(); 3931 } 3932 3933 /** 3934 * <p> 3935 * Initializes the fading edges from a given set of styled attributes. This 3936 * method should be called by subclasses that need fading edges and when an 3937 * instance of these subclasses is created programmatically rather than 3938 * being inflated from XML. This method is automatically called when the XML 3939 * is inflated. 3940 * </p> 3941 * 3942 * @param a the styled attributes set to initialize the fading edges from 3943 */ 3944 protected void initializeFadingEdge(TypedArray a) { 3945 initScrollCache(); 3946 3947 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3948 R.styleable.View_fadingEdgeLength, 3949 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3950 } 3951 3952 /** 3953 * Returns the size of the vertical faded edges used to indicate that more 3954 * content in this view is visible. 3955 * 3956 * @return The size in pixels of the vertical faded edge or 0 if vertical 3957 * faded edges are not enabled for this view. 3958 * @attr ref android.R.styleable#View_fadingEdgeLength 3959 */ 3960 public int getVerticalFadingEdgeLength() { 3961 if (isVerticalFadingEdgeEnabled()) { 3962 ScrollabilityCache cache = mScrollCache; 3963 if (cache != null) { 3964 return cache.fadingEdgeLength; 3965 } 3966 } 3967 return 0; 3968 } 3969 3970 /** 3971 * Set the size of the faded edge used to indicate that more content in this 3972 * view is available. Will not change whether the fading edge is enabled; use 3973 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3974 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3975 * for the vertical or horizontal fading edges. 3976 * 3977 * @param length The size in pixels of the faded edge used to indicate that more 3978 * content in this view is visible. 3979 */ 3980 public void setFadingEdgeLength(int length) { 3981 initScrollCache(); 3982 mScrollCache.fadingEdgeLength = length; 3983 } 3984 3985 /** 3986 * Returns the size of the horizontal faded edges used to indicate that more 3987 * content in this view is visible. 3988 * 3989 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3990 * faded edges are not enabled for this view. 3991 * @attr ref android.R.styleable#View_fadingEdgeLength 3992 */ 3993 public int getHorizontalFadingEdgeLength() { 3994 if (isHorizontalFadingEdgeEnabled()) { 3995 ScrollabilityCache cache = mScrollCache; 3996 if (cache != null) { 3997 return cache.fadingEdgeLength; 3998 } 3999 } 4000 return 0; 4001 } 4002 4003 /** 4004 * Returns the width of the vertical scrollbar. 4005 * 4006 * @return The width in pixels of the vertical scrollbar or 0 if there 4007 * is no vertical scrollbar. 4008 */ 4009 public int getVerticalScrollbarWidth() { 4010 ScrollabilityCache cache = mScrollCache; 4011 if (cache != null) { 4012 ScrollBarDrawable scrollBar = cache.scrollBar; 4013 if (scrollBar != null) { 4014 int size = scrollBar.getSize(true); 4015 if (size <= 0) { 4016 size = cache.scrollBarSize; 4017 } 4018 return size; 4019 } 4020 return 0; 4021 } 4022 return 0; 4023 } 4024 4025 /** 4026 * Returns the height of the horizontal scrollbar. 4027 * 4028 * @return The height in pixels of the horizontal scrollbar or 0 if 4029 * there is no horizontal scrollbar. 4030 */ 4031 protected int getHorizontalScrollbarHeight() { 4032 ScrollabilityCache cache = mScrollCache; 4033 if (cache != null) { 4034 ScrollBarDrawable scrollBar = cache.scrollBar; 4035 if (scrollBar != null) { 4036 int size = scrollBar.getSize(false); 4037 if (size <= 0) { 4038 size = cache.scrollBarSize; 4039 } 4040 return size; 4041 } 4042 return 0; 4043 } 4044 return 0; 4045 } 4046 4047 /** 4048 * <p> 4049 * Initializes the scrollbars from a given set of styled attributes. This 4050 * method should be called by subclasses that need scrollbars and when an 4051 * instance of these subclasses is created programmatically rather than 4052 * being inflated from XML. This method is automatically called when the XML 4053 * is inflated. 4054 * </p> 4055 * 4056 * @param a the styled attributes set to initialize the scrollbars from 4057 */ 4058 protected void initializeScrollbars(TypedArray a) { 4059 initScrollCache(); 4060 4061 final ScrollabilityCache scrollabilityCache = mScrollCache; 4062 4063 if (scrollabilityCache.scrollBar == null) { 4064 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 4065 } 4066 4067 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 4068 4069 if (!fadeScrollbars) { 4070 scrollabilityCache.state = ScrollabilityCache.ON; 4071 } 4072 scrollabilityCache.fadeScrollBars = fadeScrollbars; 4073 4074 4075 scrollabilityCache.scrollBarFadeDuration = a.getInt( 4076 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 4077 .getScrollBarFadeDuration()); 4078 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 4079 R.styleable.View_scrollbarDefaultDelayBeforeFade, 4080 ViewConfiguration.getScrollDefaultDelay()); 4081 4082 4083 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 4084 com.android.internal.R.styleable.View_scrollbarSize, 4085 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 4086 4087 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 4088 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 4089 4090 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 4091 if (thumb != null) { 4092 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 4093 } 4094 4095 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 4096 false); 4097 if (alwaysDraw) { 4098 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 4099 } 4100 4101 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 4102 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 4103 4104 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 4105 if (thumb != null) { 4106 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 4107 } 4108 4109 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 4110 false); 4111 if (alwaysDraw) { 4112 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 4113 } 4114 4115 // Apply layout direction to the new Drawables if needed 4116 final int layoutDirection = getLayoutDirection(); 4117 if (track != null) { 4118 track.setLayoutDirection(layoutDirection); 4119 } 4120 if (thumb != null) { 4121 thumb.setLayoutDirection(layoutDirection); 4122 } 4123 4124 // Re-apply user/background padding so that scrollbar(s) get added 4125 resolvePadding(); 4126 } 4127 4128 /** 4129 * <p> 4130 * Initalizes the scrollability cache if necessary. 4131 * </p> 4132 */ 4133 private void initScrollCache() { 4134 if (mScrollCache == null) { 4135 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 4136 } 4137 } 4138 4139 private ScrollabilityCache getScrollCache() { 4140 initScrollCache(); 4141 return mScrollCache; 4142 } 4143 4144 /** 4145 * Set the position of the vertical scroll bar. Should be one of 4146 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 4147 * {@link #SCROLLBAR_POSITION_RIGHT}. 4148 * 4149 * @param position Where the vertical scroll bar should be positioned. 4150 */ 4151 public void setVerticalScrollbarPosition(int position) { 4152 if (mVerticalScrollbarPosition != position) { 4153 mVerticalScrollbarPosition = position; 4154 computeOpaqueFlags(); 4155 resolvePadding(); 4156 } 4157 } 4158 4159 /** 4160 * @return The position where the vertical scroll bar will show, if applicable. 4161 * @see #setVerticalScrollbarPosition(int) 4162 */ 4163 public int getVerticalScrollbarPosition() { 4164 return mVerticalScrollbarPosition; 4165 } 4166 4167 ListenerInfo getListenerInfo() { 4168 if (mListenerInfo != null) { 4169 return mListenerInfo; 4170 } 4171 mListenerInfo = new ListenerInfo(); 4172 return mListenerInfo; 4173 } 4174 4175 /** 4176 * Register a callback to be invoked when focus of this view changed. 4177 * 4178 * @param l The callback that will run. 4179 */ 4180 public void setOnFocusChangeListener(OnFocusChangeListener l) { 4181 getListenerInfo().mOnFocusChangeListener = l; 4182 } 4183 4184 /** 4185 * Add a listener that will be called when the bounds of the view change due to 4186 * layout processing. 4187 * 4188 * @param listener The listener that will be called when layout bounds change. 4189 */ 4190 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 4191 ListenerInfo li = getListenerInfo(); 4192 if (li.mOnLayoutChangeListeners == null) { 4193 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 4194 } 4195 if (!li.mOnLayoutChangeListeners.contains(listener)) { 4196 li.mOnLayoutChangeListeners.add(listener); 4197 } 4198 } 4199 4200 /** 4201 * Remove a listener for layout changes. 4202 * 4203 * @param listener The listener for layout bounds change. 4204 */ 4205 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 4206 ListenerInfo li = mListenerInfo; 4207 if (li == null || li.mOnLayoutChangeListeners == null) { 4208 return; 4209 } 4210 li.mOnLayoutChangeListeners.remove(listener); 4211 } 4212 4213 /** 4214 * Add a listener for attach state changes. 4215 * 4216 * This listener will be called whenever this view is attached or detached 4217 * from a window. Remove the listener using 4218 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 4219 * 4220 * @param listener Listener to attach 4221 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 4222 */ 4223 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4224 ListenerInfo li = getListenerInfo(); 4225 if (li.mOnAttachStateChangeListeners == null) { 4226 li.mOnAttachStateChangeListeners 4227 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 4228 } 4229 li.mOnAttachStateChangeListeners.add(listener); 4230 } 4231 4232 /** 4233 * Remove a listener for attach state changes. The listener will receive no further 4234 * notification of window attach/detach events. 4235 * 4236 * @param listener Listener to remove 4237 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 4238 */ 4239 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4240 ListenerInfo li = mListenerInfo; 4241 if (li == null || li.mOnAttachStateChangeListeners == null) { 4242 return; 4243 } 4244 li.mOnAttachStateChangeListeners.remove(listener); 4245 } 4246 4247 /** 4248 * Returns the focus-change callback registered for this view. 4249 * 4250 * @return The callback, or null if one is not registered. 4251 */ 4252 public OnFocusChangeListener getOnFocusChangeListener() { 4253 ListenerInfo li = mListenerInfo; 4254 return li != null ? li.mOnFocusChangeListener : null; 4255 } 4256 4257 /** 4258 * Register a callback to be invoked when this view is clicked. If this view is not 4259 * clickable, it becomes clickable. 4260 * 4261 * @param l The callback that will run 4262 * 4263 * @see #setClickable(boolean) 4264 */ 4265 public void setOnClickListener(OnClickListener l) { 4266 if (!isClickable()) { 4267 setClickable(true); 4268 } 4269 getListenerInfo().mOnClickListener = l; 4270 } 4271 4272 /** 4273 * Return whether this view has an attached OnClickListener. Returns 4274 * true if there is a listener, false if there is none. 4275 */ 4276 public boolean hasOnClickListeners() { 4277 ListenerInfo li = mListenerInfo; 4278 return (li != null && li.mOnClickListener != null); 4279 } 4280 4281 /** 4282 * Register a callback to be invoked when this view is clicked and held. If this view is not 4283 * long clickable, it becomes long clickable. 4284 * 4285 * @param l The callback that will run 4286 * 4287 * @see #setLongClickable(boolean) 4288 */ 4289 public void setOnLongClickListener(OnLongClickListener l) { 4290 if (!isLongClickable()) { 4291 setLongClickable(true); 4292 } 4293 getListenerInfo().mOnLongClickListener = l; 4294 } 4295 4296 /** 4297 * Register a callback to be invoked when the context menu for this view is 4298 * being built. If this view is not long clickable, it becomes long clickable. 4299 * 4300 * @param l The callback that will run 4301 * 4302 */ 4303 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 4304 if (!isLongClickable()) { 4305 setLongClickable(true); 4306 } 4307 getListenerInfo().mOnCreateContextMenuListener = l; 4308 } 4309 4310 /** 4311 * Call this view's OnClickListener, if it is defined. Performs all normal 4312 * actions associated with clicking: reporting accessibility event, playing 4313 * a sound, etc. 4314 * 4315 * @return True there was an assigned OnClickListener that was called, false 4316 * otherwise is returned. 4317 */ 4318 public boolean performClick() { 4319 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 4320 4321 ListenerInfo li = mListenerInfo; 4322 if (li != null && li.mOnClickListener != null) { 4323 playSoundEffect(SoundEffectConstants.CLICK); 4324 li.mOnClickListener.onClick(this); 4325 return true; 4326 } 4327 4328 return false; 4329 } 4330 4331 /** 4332 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 4333 * this only calls the listener, and does not do any associated clicking 4334 * actions like reporting an accessibility event. 4335 * 4336 * @return True there was an assigned OnClickListener that was called, false 4337 * otherwise is returned. 4338 */ 4339 public boolean callOnClick() { 4340 ListenerInfo li = mListenerInfo; 4341 if (li != null && li.mOnClickListener != null) { 4342 li.mOnClickListener.onClick(this); 4343 return true; 4344 } 4345 return false; 4346 } 4347 4348 /** 4349 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 4350 * OnLongClickListener did not consume the event. 4351 * 4352 * @return True if one of the above receivers consumed the event, false otherwise. 4353 */ 4354 public boolean performLongClick() { 4355 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4356 4357 boolean handled = false; 4358 ListenerInfo li = mListenerInfo; 4359 if (li != null && li.mOnLongClickListener != null) { 4360 handled = li.mOnLongClickListener.onLongClick(View.this); 4361 } 4362 if (!handled) { 4363 handled = showContextMenu(); 4364 } 4365 if (handled) { 4366 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4367 } 4368 return handled; 4369 } 4370 4371 /** 4372 * Performs button-related actions during a touch down event. 4373 * 4374 * @param event The event. 4375 * @return True if the down was consumed. 4376 * 4377 * @hide 4378 */ 4379 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4380 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4381 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4382 return true; 4383 } 4384 } 4385 return false; 4386 } 4387 4388 /** 4389 * Bring up the context menu for this view. 4390 * 4391 * @return Whether a context menu was displayed. 4392 */ 4393 public boolean showContextMenu() { 4394 return getParent().showContextMenuForChild(this); 4395 } 4396 4397 /** 4398 * Bring up the context menu for this view, referring to the item under the specified point. 4399 * 4400 * @param x The referenced x coordinate. 4401 * @param y The referenced y coordinate. 4402 * @param metaState The keyboard modifiers that were pressed. 4403 * @return Whether a context menu was displayed. 4404 * 4405 * @hide 4406 */ 4407 public boolean showContextMenu(float x, float y, int metaState) { 4408 return showContextMenu(); 4409 } 4410 4411 /** 4412 * Start an action mode. 4413 * 4414 * @param callback Callback that will control the lifecycle of the action mode 4415 * @return The new action mode if it is started, null otherwise 4416 * 4417 * @see ActionMode 4418 */ 4419 public ActionMode startActionMode(ActionMode.Callback callback) { 4420 ViewParent parent = getParent(); 4421 if (parent == null) return null; 4422 return parent.startActionModeForChild(this, callback); 4423 } 4424 4425 /** 4426 * Register a callback to be invoked when a hardware key is pressed in this view. 4427 * Key presses in software input methods will generally not trigger the methods of 4428 * this listener. 4429 * @param l the key listener to attach to this view 4430 */ 4431 public void setOnKeyListener(OnKeyListener l) { 4432 getListenerInfo().mOnKeyListener = l; 4433 } 4434 4435 /** 4436 * Register a callback to be invoked when a touch event is sent to this view. 4437 * @param l the touch listener to attach to this view 4438 */ 4439 public void setOnTouchListener(OnTouchListener l) { 4440 getListenerInfo().mOnTouchListener = l; 4441 } 4442 4443 /** 4444 * Register a callback to be invoked when a generic motion event is sent to this view. 4445 * @param l the generic motion listener to attach to this view 4446 */ 4447 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4448 getListenerInfo().mOnGenericMotionListener = l; 4449 } 4450 4451 /** 4452 * Register a callback to be invoked when a hover event is sent to this view. 4453 * @param l the hover listener to attach to this view 4454 */ 4455 public void setOnHoverListener(OnHoverListener l) { 4456 getListenerInfo().mOnHoverListener = l; 4457 } 4458 4459 /** 4460 * Register a drag event listener callback object for this View. The parameter is 4461 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4462 * View, the system calls the 4463 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4464 * @param l An implementation of {@link android.view.View.OnDragListener}. 4465 */ 4466 public void setOnDragListener(OnDragListener l) { 4467 getListenerInfo().mOnDragListener = l; 4468 } 4469 4470 /** 4471 * Give this view focus. This will cause 4472 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4473 * 4474 * Note: this does not check whether this {@link View} should get focus, it just 4475 * gives it focus no matter what. It should only be called internally by framework 4476 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4477 * 4478 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4479 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4480 * focus moved when requestFocus() is called. It may not always 4481 * apply, in which case use the default View.FOCUS_DOWN. 4482 * @param previouslyFocusedRect The rectangle of the view that had focus 4483 * prior in this View's coordinate system. 4484 */ 4485 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4486 if (DBG) { 4487 System.out.println(this + " requestFocus()"); 4488 } 4489 4490 if ((mPrivateFlags & PFLAG_FOCUSED) == 0) { 4491 mPrivateFlags |= PFLAG_FOCUSED; 4492 4493 View oldFocus = (mAttachInfo != null) ? getRootView().findFocus() : null; 4494 4495 if (mParent != null) { 4496 mParent.requestChildFocus(this, this); 4497 } 4498 4499 if (mAttachInfo != null) { 4500 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, this); 4501 } 4502 4503 onFocusChanged(true, direction, previouslyFocusedRect); 4504 refreshDrawableState(); 4505 } 4506 } 4507 4508 /** 4509 * Request that a rectangle of this view be visible on the screen, 4510 * scrolling if necessary just enough. 4511 * 4512 * <p>A View should call this if it maintains some notion of which part 4513 * of its content is interesting. For example, a text editing view 4514 * should call this when its cursor moves. 4515 * 4516 * @param rectangle The rectangle. 4517 * @return Whether any parent scrolled. 4518 */ 4519 public boolean requestRectangleOnScreen(Rect rectangle) { 4520 return requestRectangleOnScreen(rectangle, false); 4521 } 4522 4523 /** 4524 * Request that a rectangle of this view be visible on the screen, 4525 * scrolling if necessary just enough. 4526 * 4527 * <p>A View should call this if it maintains some notion of which part 4528 * of its content is interesting. For example, a text editing view 4529 * should call this when its cursor moves. 4530 * 4531 * <p>When <code>immediate</code> is set to true, scrolling will not be 4532 * animated. 4533 * 4534 * @param rectangle The rectangle. 4535 * @param immediate True to forbid animated scrolling, false otherwise 4536 * @return Whether any parent scrolled. 4537 */ 4538 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4539 if (mParent == null) { 4540 return false; 4541 } 4542 4543 View child = this; 4544 4545 RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF(); 4546 position.set(rectangle); 4547 4548 ViewParent parent = mParent; 4549 boolean scrolled = false; 4550 while (parent != null) { 4551 rectangle.set((int) position.left, (int) position.top, 4552 (int) position.right, (int) position.bottom); 4553 4554 scrolled |= parent.requestChildRectangleOnScreen(child, 4555 rectangle, immediate); 4556 4557 if (!child.hasIdentityMatrix()) { 4558 child.getMatrix().mapRect(position); 4559 } 4560 4561 position.offset(child.mLeft, child.mTop); 4562 4563 if (!(parent instanceof View)) { 4564 break; 4565 } 4566 4567 View parentView = (View) parent; 4568 4569 position.offset(-parentView.getScrollX(), -parentView.getScrollY()); 4570 4571 child = parentView; 4572 parent = child.getParent(); 4573 } 4574 4575 return scrolled; 4576 } 4577 4578 /** 4579 * Called when this view wants to give up focus. If focus is cleared 4580 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4581 * <p> 4582 * <strong>Note:</strong> When a View clears focus the framework is trying 4583 * to give focus to the first focusable View from the top. Hence, if this 4584 * View is the first from the top that can take focus, then all callbacks 4585 * related to clearing focus will be invoked after wich the framework will 4586 * give focus to this view. 4587 * </p> 4588 */ 4589 public void clearFocus() { 4590 if (DBG) { 4591 System.out.println(this + " clearFocus()"); 4592 } 4593 4594 clearFocusInternal(true, true); 4595 } 4596 4597 /** 4598 * Clears focus from the view, optionally propagating the change up through 4599 * the parent hierarchy and requesting that the root view place new focus. 4600 * 4601 * @param propagate whether to propagate the change up through the parent 4602 * hierarchy 4603 * @param refocus when propagate is true, specifies whether to request the 4604 * root view place new focus 4605 */ 4606 void clearFocusInternal(boolean propagate, boolean refocus) { 4607 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4608 mPrivateFlags &= ~PFLAG_FOCUSED; 4609 4610 if (propagate && mParent != null) { 4611 mParent.clearChildFocus(this); 4612 } 4613 4614 onFocusChanged(false, 0, null); 4615 4616 refreshDrawableState(); 4617 4618 if (propagate && (!refocus || !rootViewRequestFocus())) { 4619 notifyGlobalFocusCleared(this); 4620 } 4621 } 4622 } 4623 4624 void notifyGlobalFocusCleared(View oldFocus) { 4625 if (oldFocus != null && mAttachInfo != null) { 4626 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null); 4627 } 4628 } 4629 4630 boolean rootViewRequestFocus() { 4631 final View root = getRootView(); 4632 return root != null && root.requestFocus(); 4633 } 4634 4635 /** 4636 * Called internally by the view system when a new view is getting focus. 4637 * This is what clears the old focus. 4638 * <p> 4639 * <b>NOTE:</b> The parent view's focused child must be updated manually 4640 * after calling this method. Otherwise, the view hierarchy may be left in 4641 * an inconstent state. 4642 */ 4643 void unFocus() { 4644 if (DBG) { 4645 System.out.println(this + " unFocus()"); 4646 } 4647 4648 clearFocusInternal(false, false); 4649 } 4650 4651 /** 4652 * Returns true if this view has focus iteself, or is the ancestor of the 4653 * view that has focus. 4654 * 4655 * @return True if this view has or contains focus, false otherwise. 4656 */ 4657 @ViewDebug.ExportedProperty(category = "focus") 4658 public boolean hasFocus() { 4659 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 4660 } 4661 4662 /** 4663 * Returns true if this view is focusable or if it contains a reachable View 4664 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4665 * is a View whose parents do not block descendants focus. 4666 * 4667 * Only {@link #VISIBLE} views are considered focusable. 4668 * 4669 * @return True if the view is focusable or if the view contains a focusable 4670 * View, false otherwise. 4671 * 4672 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4673 */ 4674 public boolean hasFocusable() { 4675 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4676 } 4677 4678 /** 4679 * Called by the view system when the focus state of this view changes. 4680 * When the focus change event is caused by directional navigation, direction 4681 * and previouslyFocusedRect provide insight into where the focus is coming from. 4682 * When overriding, be sure to call up through to the super class so that 4683 * the standard focus handling will occur. 4684 * 4685 * @param gainFocus True if the View has focus; false otherwise. 4686 * @param direction The direction focus has moved when requestFocus() 4687 * is called to give this view focus. Values are 4688 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4689 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4690 * It may not always apply, in which case use the default. 4691 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4692 * system, of the previously focused view. If applicable, this will be 4693 * passed in as finer grained information about where the focus is coming 4694 * from (in addition to direction). Will be <code>null</code> otherwise. 4695 */ 4696 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4697 if (gainFocus) { 4698 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4699 } else { 4700 notifyViewAccessibilityStateChangedIfNeeded(); 4701 } 4702 4703 InputMethodManager imm = InputMethodManager.peekInstance(); 4704 if (!gainFocus) { 4705 if (isPressed()) { 4706 setPressed(false); 4707 } 4708 if (imm != null && mAttachInfo != null 4709 && mAttachInfo.mHasWindowFocus) { 4710 imm.focusOut(this); 4711 } 4712 onFocusLost(); 4713 } else if (imm != null && mAttachInfo != null 4714 && mAttachInfo.mHasWindowFocus) { 4715 imm.focusIn(this); 4716 } 4717 4718 invalidate(true); 4719 ListenerInfo li = mListenerInfo; 4720 if (li != null && li.mOnFocusChangeListener != null) { 4721 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4722 } 4723 4724 if (mAttachInfo != null) { 4725 mAttachInfo.mKeyDispatchState.reset(this); 4726 } 4727 } 4728 4729 /** 4730 * Sends an accessibility event of the given type. If accessibility is 4731 * not enabled this method has no effect. The default implementation calls 4732 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4733 * to populate information about the event source (this View), then calls 4734 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4735 * populate the text content of the event source including its descendants, 4736 * and last calls 4737 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4738 * on its parent to resuest sending of the event to interested parties. 4739 * <p> 4740 * If an {@link AccessibilityDelegate} has been specified via calling 4741 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4742 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4743 * responsible for handling this call. 4744 * </p> 4745 * 4746 * @param eventType The type of the event to send, as defined by several types from 4747 * {@link android.view.accessibility.AccessibilityEvent}, such as 4748 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4749 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4750 * 4751 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4752 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4753 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4754 * @see AccessibilityDelegate 4755 */ 4756 public void sendAccessibilityEvent(int eventType) { 4757 // Excluded views do not send accessibility events. 4758 if (!includeForAccessibility()) { 4759 return; 4760 } 4761 if (mAccessibilityDelegate != null) { 4762 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4763 } else { 4764 sendAccessibilityEventInternal(eventType); 4765 } 4766 } 4767 4768 /** 4769 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4770 * {@link AccessibilityEvent} to make an announcement which is related to some 4771 * sort of a context change for which none of the events representing UI transitions 4772 * is a good fit. For example, announcing a new page in a book. If accessibility 4773 * is not enabled this method does nothing. 4774 * 4775 * @param text The announcement text. 4776 */ 4777 public void announceForAccessibility(CharSequence text) { 4778 if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) { 4779 AccessibilityEvent event = AccessibilityEvent.obtain( 4780 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4781 onInitializeAccessibilityEvent(event); 4782 event.getText().add(text); 4783 event.setContentDescription(null); 4784 mParent.requestSendAccessibilityEvent(this, event); 4785 } 4786 } 4787 4788 /** 4789 * @see #sendAccessibilityEvent(int) 4790 * 4791 * Note: Called from the default {@link AccessibilityDelegate}. 4792 */ 4793 void sendAccessibilityEventInternal(int eventType) { 4794 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4795 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4796 } 4797 } 4798 4799 /** 4800 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4801 * takes as an argument an empty {@link AccessibilityEvent} and does not 4802 * perform a check whether accessibility is enabled. 4803 * <p> 4804 * If an {@link AccessibilityDelegate} has been specified via calling 4805 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4806 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4807 * is responsible for handling this call. 4808 * </p> 4809 * 4810 * @param event The event to send. 4811 * 4812 * @see #sendAccessibilityEvent(int) 4813 */ 4814 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4815 if (mAccessibilityDelegate != null) { 4816 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4817 } else { 4818 sendAccessibilityEventUncheckedInternal(event); 4819 } 4820 } 4821 4822 /** 4823 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4824 * 4825 * Note: Called from the default {@link AccessibilityDelegate}. 4826 */ 4827 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4828 if (!isShown()) { 4829 return; 4830 } 4831 onInitializeAccessibilityEvent(event); 4832 // Only a subset of accessibility events populates text content. 4833 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4834 dispatchPopulateAccessibilityEvent(event); 4835 } 4836 // In the beginning we called #isShown(), so we know that getParent() is not null. 4837 getParent().requestSendAccessibilityEvent(this, event); 4838 } 4839 4840 /** 4841 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4842 * to its children for adding their text content to the event. Note that the 4843 * event text is populated in a separate dispatch path since we add to the 4844 * event not only the text of the source but also the text of all its descendants. 4845 * A typical implementation will call 4846 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4847 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4848 * on each child. Override this method if custom population of the event text 4849 * content is required. 4850 * <p> 4851 * If an {@link AccessibilityDelegate} has been specified via calling 4852 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4853 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4854 * is responsible for handling this call. 4855 * </p> 4856 * <p> 4857 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4858 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4859 * </p> 4860 * 4861 * @param event The event. 4862 * 4863 * @return True if the event population was completed. 4864 */ 4865 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4866 if (mAccessibilityDelegate != null) { 4867 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4868 } else { 4869 return dispatchPopulateAccessibilityEventInternal(event); 4870 } 4871 } 4872 4873 /** 4874 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4875 * 4876 * Note: Called from the default {@link AccessibilityDelegate}. 4877 */ 4878 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4879 onPopulateAccessibilityEvent(event); 4880 return false; 4881 } 4882 4883 /** 4884 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4885 * giving a chance to this View to populate the accessibility event with its 4886 * text content. While this method is free to modify event 4887 * attributes other than text content, doing so should normally be performed in 4888 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4889 * <p> 4890 * Example: Adding formatted date string to an accessibility event in addition 4891 * to the text added by the super implementation: 4892 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4893 * super.onPopulateAccessibilityEvent(event); 4894 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4895 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4896 * mCurrentDate.getTimeInMillis(), flags); 4897 * event.getText().add(selectedDateUtterance); 4898 * }</pre> 4899 * <p> 4900 * If an {@link AccessibilityDelegate} has been specified via calling 4901 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4902 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4903 * is responsible for handling this call. 4904 * </p> 4905 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4906 * information to the event, in case the default implementation has basic information to add. 4907 * </p> 4908 * 4909 * @param event The accessibility event which to populate. 4910 * 4911 * @see #sendAccessibilityEvent(int) 4912 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4913 */ 4914 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4915 if (mAccessibilityDelegate != null) { 4916 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4917 } else { 4918 onPopulateAccessibilityEventInternal(event); 4919 } 4920 } 4921 4922 /** 4923 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4924 * 4925 * Note: Called from the default {@link AccessibilityDelegate}. 4926 */ 4927 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4928 } 4929 4930 /** 4931 * Initializes an {@link AccessibilityEvent} with information about 4932 * this View which is the event source. In other words, the source of 4933 * an accessibility event is the view whose state change triggered firing 4934 * the event. 4935 * <p> 4936 * Example: Setting the password property of an event in addition 4937 * to properties set by the super implementation: 4938 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4939 * super.onInitializeAccessibilityEvent(event); 4940 * event.setPassword(true); 4941 * }</pre> 4942 * <p> 4943 * If an {@link AccessibilityDelegate} has been specified via calling 4944 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4945 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4946 * is responsible for handling this call. 4947 * </p> 4948 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4949 * information to the event, in case the default implementation has basic information to add. 4950 * </p> 4951 * @param event The event to initialize. 4952 * 4953 * @see #sendAccessibilityEvent(int) 4954 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4955 */ 4956 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4957 if (mAccessibilityDelegate != null) { 4958 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4959 } else { 4960 onInitializeAccessibilityEventInternal(event); 4961 } 4962 } 4963 4964 /** 4965 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4966 * 4967 * Note: Called from the default {@link AccessibilityDelegate}. 4968 */ 4969 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4970 event.setSource(this); 4971 event.setClassName(View.class.getName()); 4972 event.setPackageName(getContext().getPackageName()); 4973 event.setEnabled(isEnabled()); 4974 event.setContentDescription(mContentDescription); 4975 4976 switch (event.getEventType()) { 4977 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 4978 ArrayList<View> focusablesTempList = (mAttachInfo != null) 4979 ? mAttachInfo.mTempArrayList : new ArrayList<View>(); 4980 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 4981 event.setItemCount(focusablesTempList.size()); 4982 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4983 if (mAttachInfo != null) { 4984 focusablesTempList.clear(); 4985 } 4986 } break; 4987 case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED: { 4988 CharSequence text = getIterableTextForAccessibility(); 4989 if (text != null && text.length() > 0) { 4990 event.setFromIndex(getAccessibilitySelectionStart()); 4991 event.setToIndex(getAccessibilitySelectionEnd()); 4992 event.setItemCount(text.length()); 4993 } 4994 } break; 4995 } 4996 } 4997 4998 /** 4999 * Returns an {@link AccessibilityNodeInfo} representing this view from the 5000 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 5001 * This method is responsible for obtaining an accessibility node info from a 5002 * pool of reusable instances and calling 5003 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 5004 * initialize the former. 5005 * <p> 5006 * Note: The client is responsible for recycling the obtained instance by calling 5007 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 5008 * </p> 5009 * 5010 * @return A populated {@link AccessibilityNodeInfo}. 5011 * 5012 * @see AccessibilityNodeInfo 5013 */ 5014 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 5015 if (mAccessibilityDelegate != null) { 5016 return mAccessibilityDelegate.createAccessibilityNodeInfo(this); 5017 } else { 5018 return createAccessibilityNodeInfoInternal(); 5019 } 5020 } 5021 5022 /** 5023 * @see #createAccessibilityNodeInfo() 5024 */ 5025 AccessibilityNodeInfo createAccessibilityNodeInfoInternal() { 5026 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 5027 if (provider != null) { 5028 return provider.createAccessibilityNodeInfo(View.NO_ID); 5029 } else { 5030 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 5031 onInitializeAccessibilityNodeInfo(info); 5032 return info; 5033 } 5034 } 5035 5036 /** 5037 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 5038 * The base implementation sets: 5039 * <ul> 5040 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 5041 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 5042 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 5043 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 5044 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 5045 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 5046 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 5047 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 5048 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 5049 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 5050 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 5051 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 5052 * </ul> 5053 * <p> 5054 * Subclasses should override this method, call the super implementation, 5055 * and set additional attributes. 5056 * </p> 5057 * <p> 5058 * If an {@link AccessibilityDelegate} has been specified via calling 5059 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5060 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 5061 * is responsible for handling this call. 5062 * </p> 5063 * 5064 * @param info The instance to initialize. 5065 */ 5066 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 5067 if (mAccessibilityDelegate != null) { 5068 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 5069 } else { 5070 onInitializeAccessibilityNodeInfoInternal(info); 5071 } 5072 } 5073 5074 /** 5075 * Gets the location of this view in screen coordintates. 5076 * 5077 * @param outRect The output location 5078 */ 5079 void getBoundsOnScreen(Rect outRect) { 5080 if (mAttachInfo == null) { 5081 return; 5082 } 5083 5084 RectF position = mAttachInfo.mTmpTransformRect; 5085 position.set(0, 0, mRight - mLeft, mBottom - mTop); 5086 5087 if (!hasIdentityMatrix()) { 5088 getMatrix().mapRect(position); 5089 } 5090 5091 position.offset(mLeft, mTop); 5092 5093 ViewParent parent = mParent; 5094 while (parent instanceof View) { 5095 View parentView = (View) parent; 5096 5097 position.offset(-parentView.mScrollX, -parentView.mScrollY); 5098 5099 if (!parentView.hasIdentityMatrix()) { 5100 parentView.getMatrix().mapRect(position); 5101 } 5102 5103 position.offset(parentView.mLeft, parentView.mTop); 5104 5105 parent = parentView.mParent; 5106 } 5107 5108 if (parent instanceof ViewRootImpl) { 5109 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 5110 position.offset(0, -viewRootImpl.mCurScrollY); 5111 } 5112 5113 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 5114 5115 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 5116 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 5117 } 5118 5119 /** 5120 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 5121 * 5122 * Note: Called from the default {@link AccessibilityDelegate}. 5123 */ 5124 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 5125 Rect bounds = mAttachInfo.mTmpInvalRect; 5126 5127 getDrawingRect(bounds); 5128 info.setBoundsInParent(bounds); 5129 5130 getBoundsOnScreen(bounds); 5131 info.setBoundsInScreen(bounds); 5132 5133 ViewParent parent = getParentForAccessibility(); 5134 if (parent instanceof View) { 5135 info.setParent((View) parent); 5136 } 5137 5138 if (mID != View.NO_ID) { 5139 View rootView = getRootView(); 5140 if (rootView == null) { 5141 rootView = this; 5142 } 5143 View label = rootView.findLabelForView(this, mID); 5144 if (label != null) { 5145 info.setLabeledBy(label); 5146 } 5147 5148 if ((mAttachInfo.mAccessibilityFetchFlags 5149 & AccessibilityNodeInfo.FLAG_REPORT_VIEW_IDS) != 0 5150 && Resources.resourceHasPackage(mID)) { 5151 try { 5152 String viewId = getResources().getResourceName(mID); 5153 info.setViewIdResourceName(viewId); 5154 } catch (Resources.NotFoundException nfe) { 5155 /* ignore */ 5156 } 5157 } 5158 } 5159 5160 if (mLabelForId != View.NO_ID) { 5161 View rootView = getRootView(); 5162 if (rootView == null) { 5163 rootView = this; 5164 } 5165 View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId); 5166 if (labeled != null) { 5167 info.setLabelFor(labeled); 5168 } 5169 } 5170 5171 info.setVisibleToUser(isVisibleToUser()); 5172 5173 info.setPackageName(mContext.getPackageName()); 5174 info.setClassName(View.class.getName()); 5175 info.setContentDescription(getContentDescription()); 5176 5177 info.setEnabled(isEnabled()); 5178 info.setClickable(isClickable()); 5179 info.setFocusable(isFocusable()); 5180 info.setFocused(isFocused()); 5181 info.setAccessibilityFocused(isAccessibilityFocused()); 5182 info.setSelected(isSelected()); 5183 info.setLongClickable(isLongClickable()); 5184 5185 // TODO: These make sense only if we are in an AdapterView but all 5186 // views can be selected. Maybe from accessibility perspective 5187 // we should report as selectable view in an AdapterView. 5188 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 5189 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 5190 5191 if (isFocusable()) { 5192 if (isFocused()) { 5193 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 5194 } else { 5195 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 5196 } 5197 } 5198 5199 if (!isAccessibilityFocused()) { 5200 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 5201 } else { 5202 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 5203 } 5204 5205 if (isClickable() && isEnabled()) { 5206 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 5207 } 5208 5209 if (isLongClickable() && isEnabled()) { 5210 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 5211 } 5212 5213 CharSequence text = getIterableTextForAccessibility(); 5214 if (text != null && text.length() > 0) { 5215 info.setTextSelection(getAccessibilitySelectionStart(), getAccessibilitySelectionEnd()); 5216 5217 info.addAction(AccessibilityNodeInfo.ACTION_SET_SELECTION); 5218 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 5219 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 5220 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 5221 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 5222 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 5223 } 5224 } 5225 5226 private View findLabelForView(View view, int labeledId) { 5227 if (mMatchLabelForPredicate == null) { 5228 mMatchLabelForPredicate = new MatchLabelForPredicate(); 5229 } 5230 mMatchLabelForPredicate.mLabeledId = labeledId; 5231 return findViewByPredicateInsideOut(view, mMatchLabelForPredicate); 5232 } 5233 5234 /** 5235 * Computes whether this view is visible to the user. Such a view is 5236 * attached, visible, all its predecessors are visible, it is not clipped 5237 * entirely by its predecessors, and has an alpha greater than zero. 5238 * 5239 * @return Whether the view is visible on the screen. 5240 * 5241 * @hide 5242 */ 5243 protected boolean isVisibleToUser() { 5244 return isVisibleToUser(null); 5245 } 5246 5247 /** 5248 * Computes whether the given portion of this view is visible to the user. 5249 * Such a view is attached, visible, all its predecessors are visible, 5250 * has an alpha greater than zero, and the specified portion is not 5251 * clipped entirely by its predecessors. 5252 * 5253 * @param boundInView the portion of the view to test; coordinates should be relative; may be 5254 * <code>null</code>, and the entire view will be tested in this case. 5255 * When <code>true</code> is returned by the function, the actual visible 5256 * region will be stored in this parameter; that is, if boundInView is fully 5257 * contained within the view, no modification will be made, otherwise regions 5258 * outside of the visible area of the view will be clipped. 5259 * 5260 * @return Whether the specified portion of the view is visible on the screen. 5261 * 5262 * @hide 5263 */ 5264 protected boolean isVisibleToUser(Rect boundInView) { 5265 if (mAttachInfo != null) { 5266 // Attached to invisible window means this view is not visible. 5267 if (mAttachInfo.mWindowVisibility != View.VISIBLE) { 5268 return false; 5269 } 5270 // An invisible predecessor or one with alpha zero means 5271 // that this view is not visible to the user. 5272 Object current = this; 5273 while (current instanceof View) { 5274 View view = (View) current; 5275 // We have attach info so this view is attached and there is no 5276 // need to check whether we reach to ViewRootImpl on the way up. 5277 if (view.getAlpha() <= 0 || view.getVisibility() != VISIBLE) { 5278 return false; 5279 } 5280 current = view.mParent; 5281 } 5282 // Check if the view is entirely covered by its predecessors. 5283 Rect visibleRect = mAttachInfo.mTmpInvalRect; 5284 Point offset = mAttachInfo.mPoint; 5285 if (!getGlobalVisibleRect(visibleRect, offset)) { 5286 return false; 5287 } 5288 // Check if the visible portion intersects the rectangle of interest. 5289 if (boundInView != null) { 5290 visibleRect.offset(-offset.x, -offset.y); 5291 return boundInView.intersect(visibleRect); 5292 } 5293 return true; 5294 } 5295 return false; 5296 } 5297 5298 /** 5299 * Returns the delegate for implementing accessibility support via 5300 * composition. For more details see {@link AccessibilityDelegate}. 5301 * 5302 * @return The delegate, or null if none set. 5303 * 5304 * @hide 5305 */ 5306 public AccessibilityDelegate getAccessibilityDelegate() { 5307 return mAccessibilityDelegate; 5308 } 5309 5310 /** 5311 * Sets a delegate for implementing accessibility support via composition as 5312 * opposed to inheritance. The delegate's primary use is for implementing 5313 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 5314 * 5315 * @param delegate The delegate instance. 5316 * 5317 * @see AccessibilityDelegate 5318 */ 5319 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 5320 mAccessibilityDelegate = delegate; 5321 } 5322 5323 /** 5324 * Gets the provider for managing a virtual view hierarchy rooted at this View 5325 * and reported to {@link android.accessibilityservice.AccessibilityService}s 5326 * that explore the window content. 5327 * <p> 5328 * If this method returns an instance, this instance is responsible for managing 5329 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 5330 * View including the one representing the View itself. Similarly the returned 5331 * instance is responsible for performing accessibility actions on any virtual 5332 * view or the root view itself. 5333 * </p> 5334 * <p> 5335 * If an {@link AccessibilityDelegate} has been specified via calling 5336 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5337 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 5338 * is responsible for handling this call. 5339 * </p> 5340 * 5341 * @return The provider. 5342 * 5343 * @see AccessibilityNodeProvider 5344 */ 5345 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 5346 if (mAccessibilityDelegate != null) { 5347 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 5348 } else { 5349 return null; 5350 } 5351 } 5352 5353 /** 5354 * Gets the unique identifier of this view on the screen for accessibility purposes. 5355 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 5356 * 5357 * @return The view accessibility id. 5358 * 5359 * @hide 5360 */ 5361 public int getAccessibilityViewId() { 5362 if (mAccessibilityViewId == NO_ID) { 5363 mAccessibilityViewId = sNextAccessibilityViewId++; 5364 } 5365 return mAccessibilityViewId; 5366 } 5367 5368 /** 5369 * Gets the unique identifier of the window in which this View reseides. 5370 * 5371 * @return The window accessibility id. 5372 * 5373 * @hide 5374 */ 5375 public int getAccessibilityWindowId() { 5376 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 5377 } 5378 5379 /** 5380 * Gets the {@link View} description. It briefly describes the view and is 5381 * primarily used for accessibility support. Set this property to enable 5382 * better accessibility support for your application. This is especially 5383 * true for views that do not have textual representation (For example, 5384 * ImageButton). 5385 * 5386 * @return The content description. 5387 * 5388 * @attr ref android.R.styleable#View_contentDescription 5389 */ 5390 @ViewDebug.ExportedProperty(category = "accessibility") 5391 public CharSequence getContentDescription() { 5392 return mContentDescription; 5393 } 5394 5395 /** 5396 * Sets the {@link View} description. It briefly describes the view and is 5397 * primarily used for accessibility support. Set this property to enable 5398 * better accessibility support for your application. This is especially 5399 * true for views that do not have textual representation (For example, 5400 * ImageButton). 5401 * 5402 * @param contentDescription The content description. 5403 * 5404 * @attr ref android.R.styleable#View_contentDescription 5405 */ 5406 @RemotableViewMethod 5407 public void setContentDescription(CharSequence contentDescription) { 5408 if (mContentDescription == null) { 5409 if (contentDescription == null) { 5410 return; 5411 } 5412 } else if (mContentDescription.equals(contentDescription)) { 5413 return; 5414 } 5415 mContentDescription = contentDescription; 5416 final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; 5417 if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 5418 setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 5419 notifySubtreeAccessibilityStateChangedIfNeeded(); 5420 } else { 5421 notifyViewAccessibilityStateChangedIfNeeded(); 5422 } 5423 } 5424 5425 /** 5426 * Gets the id of a view for which this view serves as a label for 5427 * accessibility purposes. 5428 * 5429 * @return The labeled view id. 5430 */ 5431 @ViewDebug.ExportedProperty(category = "accessibility") 5432 public int getLabelFor() { 5433 return mLabelForId; 5434 } 5435 5436 /** 5437 * Sets the id of a view for which this view serves as a label for 5438 * accessibility purposes. 5439 * 5440 * @param id The labeled view id. 5441 */ 5442 @RemotableViewMethod 5443 public void setLabelFor(int id) { 5444 mLabelForId = id; 5445 if (mLabelForId != View.NO_ID 5446 && mID == View.NO_ID) { 5447 mID = generateViewId(); 5448 } 5449 } 5450 5451 /** 5452 * Invoked whenever this view loses focus, either by losing window focus or by losing 5453 * focus within its window. This method can be used to clear any state tied to the 5454 * focus. For instance, if a button is held pressed with the trackball and the window 5455 * loses focus, this method can be used to cancel the press. 5456 * 5457 * Subclasses of View overriding this method should always call super.onFocusLost(). 5458 * 5459 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 5460 * @see #onWindowFocusChanged(boolean) 5461 * 5462 * @hide pending API council approval 5463 */ 5464 protected void onFocusLost() { 5465 resetPressedState(); 5466 } 5467 5468 private void resetPressedState() { 5469 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5470 return; 5471 } 5472 5473 if (isPressed()) { 5474 setPressed(false); 5475 5476 if (!mHasPerformedLongPress) { 5477 removeLongPressCallback(); 5478 } 5479 } 5480 } 5481 5482 /** 5483 * Returns true if this view has focus 5484 * 5485 * @return True if this view has focus, false otherwise. 5486 */ 5487 @ViewDebug.ExportedProperty(category = "focus") 5488 public boolean isFocused() { 5489 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 5490 } 5491 5492 /** 5493 * Find the view in the hierarchy rooted at this view that currently has 5494 * focus. 5495 * 5496 * @return The view that currently has focus, or null if no focused view can 5497 * be found. 5498 */ 5499 public View findFocus() { 5500 return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null; 5501 } 5502 5503 /** 5504 * Indicates whether this view is one of the set of scrollable containers in 5505 * its window. 5506 * 5507 * @return whether this view is one of the set of scrollable containers in 5508 * its window 5509 * 5510 * @attr ref android.R.styleable#View_isScrollContainer 5511 */ 5512 public boolean isScrollContainer() { 5513 return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0; 5514 } 5515 5516 /** 5517 * Change whether this view is one of the set of scrollable containers in 5518 * its window. This will be used to determine whether the window can 5519 * resize or must pan when a soft input area is open -- scrollable 5520 * containers allow the window to use resize mode since the container 5521 * will appropriately shrink. 5522 * 5523 * @attr ref android.R.styleable#View_isScrollContainer 5524 */ 5525 public void setScrollContainer(boolean isScrollContainer) { 5526 if (isScrollContainer) { 5527 if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) { 5528 mAttachInfo.mScrollContainers.add(this); 5529 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 5530 } 5531 mPrivateFlags |= PFLAG_SCROLL_CONTAINER; 5532 } else { 5533 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 5534 mAttachInfo.mScrollContainers.remove(this); 5535 } 5536 mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED); 5537 } 5538 } 5539 5540 /** 5541 * Returns the quality of the drawing cache. 5542 * 5543 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5544 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5545 * 5546 * @see #setDrawingCacheQuality(int) 5547 * @see #setDrawingCacheEnabled(boolean) 5548 * @see #isDrawingCacheEnabled() 5549 * 5550 * @attr ref android.R.styleable#View_drawingCacheQuality 5551 */ 5552 public int getDrawingCacheQuality() { 5553 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5554 } 5555 5556 /** 5557 * Set the drawing cache quality of this view. This value is used only when the 5558 * drawing cache is enabled 5559 * 5560 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5561 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5562 * 5563 * @see #getDrawingCacheQuality() 5564 * @see #setDrawingCacheEnabled(boolean) 5565 * @see #isDrawingCacheEnabled() 5566 * 5567 * @attr ref android.R.styleable#View_drawingCacheQuality 5568 */ 5569 public void setDrawingCacheQuality(int quality) { 5570 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5571 } 5572 5573 /** 5574 * Returns whether the screen should remain on, corresponding to the current 5575 * value of {@link #KEEP_SCREEN_ON}. 5576 * 5577 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5578 * 5579 * @see #setKeepScreenOn(boolean) 5580 * 5581 * @attr ref android.R.styleable#View_keepScreenOn 5582 */ 5583 public boolean getKeepScreenOn() { 5584 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5585 } 5586 5587 /** 5588 * Controls whether the screen should remain on, modifying the 5589 * value of {@link #KEEP_SCREEN_ON}. 5590 * 5591 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5592 * 5593 * @see #getKeepScreenOn() 5594 * 5595 * @attr ref android.R.styleable#View_keepScreenOn 5596 */ 5597 public void setKeepScreenOn(boolean keepScreenOn) { 5598 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5599 } 5600 5601 /** 5602 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5603 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5604 * 5605 * @attr ref android.R.styleable#View_nextFocusLeft 5606 */ 5607 public int getNextFocusLeftId() { 5608 return mNextFocusLeftId; 5609 } 5610 5611 /** 5612 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5613 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5614 * decide automatically. 5615 * 5616 * @attr ref android.R.styleable#View_nextFocusLeft 5617 */ 5618 public void setNextFocusLeftId(int nextFocusLeftId) { 5619 mNextFocusLeftId = nextFocusLeftId; 5620 } 5621 5622 /** 5623 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5624 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5625 * 5626 * @attr ref android.R.styleable#View_nextFocusRight 5627 */ 5628 public int getNextFocusRightId() { 5629 return mNextFocusRightId; 5630 } 5631 5632 /** 5633 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5634 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5635 * decide automatically. 5636 * 5637 * @attr ref android.R.styleable#View_nextFocusRight 5638 */ 5639 public void setNextFocusRightId(int nextFocusRightId) { 5640 mNextFocusRightId = nextFocusRightId; 5641 } 5642 5643 /** 5644 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5645 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5646 * 5647 * @attr ref android.R.styleable#View_nextFocusUp 5648 */ 5649 public int getNextFocusUpId() { 5650 return mNextFocusUpId; 5651 } 5652 5653 /** 5654 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5655 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5656 * decide automatically. 5657 * 5658 * @attr ref android.R.styleable#View_nextFocusUp 5659 */ 5660 public void setNextFocusUpId(int nextFocusUpId) { 5661 mNextFocusUpId = nextFocusUpId; 5662 } 5663 5664 /** 5665 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5666 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5667 * 5668 * @attr ref android.R.styleable#View_nextFocusDown 5669 */ 5670 public int getNextFocusDownId() { 5671 return mNextFocusDownId; 5672 } 5673 5674 /** 5675 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5676 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5677 * decide automatically. 5678 * 5679 * @attr ref android.R.styleable#View_nextFocusDown 5680 */ 5681 public void setNextFocusDownId(int nextFocusDownId) { 5682 mNextFocusDownId = nextFocusDownId; 5683 } 5684 5685 /** 5686 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5687 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5688 * 5689 * @attr ref android.R.styleable#View_nextFocusForward 5690 */ 5691 public int getNextFocusForwardId() { 5692 return mNextFocusForwardId; 5693 } 5694 5695 /** 5696 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5697 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5698 * decide automatically. 5699 * 5700 * @attr ref android.R.styleable#View_nextFocusForward 5701 */ 5702 public void setNextFocusForwardId(int nextFocusForwardId) { 5703 mNextFocusForwardId = nextFocusForwardId; 5704 } 5705 5706 /** 5707 * Returns the visibility of this view and all of its ancestors 5708 * 5709 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5710 */ 5711 public boolean isShown() { 5712 View current = this; 5713 //noinspection ConstantConditions 5714 do { 5715 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5716 return false; 5717 } 5718 ViewParent parent = current.mParent; 5719 if (parent == null) { 5720 return false; // We are not attached to the view root 5721 } 5722 if (!(parent instanceof View)) { 5723 return true; 5724 } 5725 current = (View) parent; 5726 } while (current != null); 5727 5728 return false; 5729 } 5730 5731 /** 5732 * Called by the view hierarchy when the content insets for a window have 5733 * changed, to allow it to adjust its content to fit within those windows. 5734 * The content insets tell you the space that the status bar, input method, 5735 * and other system windows infringe on the application's window. 5736 * 5737 * <p>You do not normally need to deal with this function, since the default 5738 * window decoration given to applications takes care of applying it to the 5739 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5740 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5741 * and your content can be placed under those system elements. You can then 5742 * use this method within your view hierarchy if you have parts of your UI 5743 * which you would like to ensure are not being covered. 5744 * 5745 * <p>The default implementation of this method simply applies the content 5746 * insets to the view's padding, consuming that content (modifying the 5747 * insets to be 0), and returning true. This behavior is off by default, but can 5748 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5749 * 5750 * <p>This function's traversal down the hierarchy is depth-first. The same content 5751 * insets object is propagated down the hierarchy, so any changes made to it will 5752 * be seen by all following views (including potentially ones above in 5753 * the hierarchy since this is a depth-first traversal). The first view 5754 * that returns true will abort the entire traversal. 5755 * 5756 * <p>The default implementation works well for a situation where it is 5757 * used with a container that covers the entire window, allowing it to 5758 * apply the appropriate insets to its content on all edges. If you need 5759 * a more complicated layout (such as two different views fitting system 5760 * windows, one on the top of the window, and one on the bottom), 5761 * you can override the method and handle the insets however you would like. 5762 * Note that the insets provided by the framework are always relative to the 5763 * far edges of the window, not accounting for the location of the called view 5764 * within that window. (In fact when this method is called you do not yet know 5765 * where the layout will place the view, as it is done before layout happens.) 5766 * 5767 * <p>Note: unlike many View methods, there is no dispatch phase to this 5768 * call. If you are overriding it in a ViewGroup and want to allow the 5769 * call to continue to your children, you must be sure to call the super 5770 * implementation. 5771 * 5772 * <p>Here is a sample layout that makes use of fitting system windows 5773 * to have controls for a video view placed inside of the window decorations 5774 * that it hides and shows. This can be used with code like the second 5775 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5776 * 5777 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5778 * 5779 * @param insets Current content insets of the window. Prior to 5780 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5781 * the insets or else you and Android will be unhappy. 5782 * 5783 * @return {@code true} if this view applied the insets and it should not 5784 * continue propagating further down the hierarchy, {@code false} otherwise. 5785 * @see #getFitsSystemWindows() 5786 * @see #setFitsSystemWindows(boolean) 5787 * @see #setSystemUiVisibility(int) 5788 */ 5789 protected boolean fitSystemWindows(Rect insets) { 5790 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5791 mUserPaddingStart = UNDEFINED_PADDING; 5792 mUserPaddingEnd = UNDEFINED_PADDING; 5793 Rect localInsets = sThreadLocal.get(); 5794 if (localInsets == null) { 5795 localInsets = new Rect(); 5796 sThreadLocal.set(localInsets); 5797 } 5798 boolean res = computeFitSystemWindows(insets, localInsets); 5799 internalSetPadding(localInsets.left, localInsets.top, 5800 localInsets.right, localInsets.bottom); 5801 return res; 5802 } 5803 return false; 5804 } 5805 5806 /** 5807 * @hide Compute the insets that should be consumed by this view and the ones 5808 * that should propagate to those under it. 5809 */ 5810 protected boolean computeFitSystemWindows(Rect inoutInsets, Rect outLocalInsets) { 5811 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5812 || mAttachInfo == null 5813 || ((mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0 5814 && !mAttachInfo.mOverscanRequested)) { 5815 outLocalInsets.set(inoutInsets); 5816 inoutInsets.set(0, 0, 0, 0); 5817 return true; 5818 } else { 5819 // The application wants to take care of fitting system window for 5820 // the content... however we still need to take care of any overscan here. 5821 final Rect overscan = mAttachInfo.mOverscanInsets; 5822 outLocalInsets.set(overscan); 5823 inoutInsets.left -= overscan.left; 5824 inoutInsets.top -= overscan.top; 5825 inoutInsets.right -= overscan.right; 5826 inoutInsets.bottom -= overscan.bottom; 5827 return false; 5828 } 5829 } 5830 5831 /** 5832 * Sets whether or not this view should account for system screen decorations 5833 * such as the status bar and inset its content; that is, controlling whether 5834 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5835 * executed. See that method for more details. 5836 * 5837 * <p>Note that if you are providing your own implementation of 5838 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5839 * flag to true -- your implementation will be overriding the default 5840 * implementation that checks this flag. 5841 * 5842 * @param fitSystemWindows If true, then the default implementation of 5843 * {@link #fitSystemWindows(Rect)} will be executed. 5844 * 5845 * @attr ref android.R.styleable#View_fitsSystemWindows 5846 * @see #getFitsSystemWindows() 5847 * @see #fitSystemWindows(Rect) 5848 * @see #setSystemUiVisibility(int) 5849 */ 5850 public void setFitsSystemWindows(boolean fitSystemWindows) { 5851 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5852 } 5853 5854 /** 5855 * Check for state of {@link #setFitsSystemWindows(boolean)}. If this method 5856 * returns {@code true}, the default implementation of {@link #fitSystemWindows(Rect)} 5857 * will be executed. 5858 * 5859 * @return {@code true} if the default implementation of 5860 * {@link #fitSystemWindows(Rect)} will be executed. 5861 * 5862 * @attr ref android.R.styleable#View_fitsSystemWindows 5863 * @see #setFitsSystemWindows(boolean) 5864 * @see #fitSystemWindows(Rect) 5865 * @see #setSystemUiVisibility(int) 5866 */ 5867 public boolean getFitsSystemWindows() { 5868 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5869 } 5870 5871 /** @hide */ 5872 public boolean fitsSystemWindows() { 5873 return getFitsSystemWindows(); 5874 } 5875 5876 /** 5877 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5878 */ 5879 public void requestFitSystemWindows() { 5880 if (mParent != null) { 5881 mParent.requestFitSystemWindows(); 5882 } 5883 } 5884 5885 /** 5886 * For use by PhoneWindow to make its own system window fitting optional. 5887 * @hide 5888 */ 5889 public void makeOptionalFitsSystemWindows() { 5890 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5891 } 5892 5893 /** 5894 * Returns the visibility status for this view. 5895 * 5896 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5897 * @attr ref android.R.styleable#View_visibility 5898 */ 5899 @ViewDebug.ExportedProperty(mapping = { 5900 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5901 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5902 @ViewDebug.IntToString(from = GONE, to = "GONE") 5903 }) 5904 public int getVisibility() { 5905 return mViewFlags & VISIBILITY_MASK; 5906 } 5907 5908 /** 5909 * Set the enabled state of this view. 5910 * 5911 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5912 * @attr ref android.R.styleable#View_visibility 5913 */ 5914 @RemotableViewMethod 5915 public void setVisibility(int visibility) { 5916 setFlags(visibility, VISIBILITY_MASK); 5917 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5918 } 5919 5920 /** 5921 * Returns the enabled status for this view. The interpretation of the 5922 * enabled state varies by subclass. 5923 * 5924 * @return True if this view is enabled, false otherwise. 5925 */ 5926 @ViewDebug.ExportedProperty 5927 public boolean isEnabled() { 5928 return (mViewFlags & ENABLED_MASK) == ENABLED; 5929 } 5930 5931 /** 5932 * Set the enabled state of this view. The interpretation of the enabled 5933 * state varies by subclass. 5934 * 5935 * @param enabled True if this view is enabled, false otherwise. 5936 */ 5937 @RemotableViewMethod 5938 public void setEnabled(boolean enabled) { 5939 if (enabled == isEnabled()) return; 5940 5941 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5942 5943 /* 5944 * The View most likely has to change its appearance, so refresh 5945 * the drawable state. 5946 */ 5947 refreshDrawableState(); 5948 5949 // Invalidate too, since the default behavior for views is to be 5950 // be drawn at 50% alpha rather than to change the drawable. 5951 invalidate(true); 5952 } 5953 5954 /** 5955 * Set whether this view can receive the focus. 5956 * 5957 * Setting this to false will also ensure that this view is not focusable 5958 * in touch mode. 5959 * 5960 * @param focusable If true, this view can receive the focus. 5961 * 5962 * @see #setFocusableInTouchMode(boolean) 5963 * @attr ref android.R.styleable#View_focusable 5964 */ 5965 public void setFocusable(boolean focusable) { 5966 if (!focusable) { 5967 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5968 } 5969 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5970 } 5971 5972 /** 5973 * Set whether this view can receive focus while in touch mode. 5974 * 5975 * Setting this to true will also ensure that this view is focusable. 5976 * 5977 * @param focusableInTouchMode If true, this view can receive the focus while 5978 * in touch mode. 5979 * 5980 * @see #setFocusable(boolean) 5981 * @attr ref android.R.styleable#View_focusableInTouchMode 5982 */ 5983 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5984 // Focusable in touch mode should always be set before the focusable flag 5985 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5986 // which, in touch mode, will not successfully request focus on this view 5987 // because the focusable in touch mode flag is not set 5988 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5989 if (focusableInTouchMode) { 5990 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5991 } 5992 } 5993 5994 /** 5995 * Set whether this view should have sound effects enabled for events such as 5996 * clicking and touching. 5997 * 5998 * <p>You may wish to disable sound effects for a view if you already play sounds, 5999 * for instance, a dial key that plays dtmf tones. 6000 * 6001 * @param soundEffectsEnabled whether sound effects are enabled for this view. 6002 * @see #isSoundEffectsEnabled() 6003 * @see #playSoundEffect(int) 6004 * @attr ref android.R.styleable#View_soundEffectsEnabled 6005 */ 6006 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 6007 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 6008 } 6009 6010 /** 6011 * @return whether this view should have sound effects enabled for events such as 6012 * clicking and touching. 6013 * 6014 * @see #setSoundEffectsEnabled(boolean) 6015 * @see #playSoundEffect(int) 6016 * @attr ref android.R.styleable#View_soundEffectsEnabled 6017 */ 6018 @ViewDebug.ExportedProperty 6019 public boolean isSoundEffectsEnabled() { 6020 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 6021 } 6022 6023 /** 6024 * Set whether this view should have haptic feedback for events such as 6025 * long presses. 6026 * 6027 * <p>You may wish to disable haptic feedback if your view already controls 6028 * its own haptic feedback. 6029 * 6030 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 6031 * @see #isHapticFeedbackEnabled() 6032 * @see #performHapticFeedback(int) 6033 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 6034 */ 6035 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 6036 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 6037 } 6038 6039 /** 6040 * @return whether this view should have haptic feedback enabled for events 6041 * long presses. 6042 * 6043 * @see #setHapticFeedbackEnabled(boolean) 6044 * @see #performHapticFeedback(int) 6045 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 6046 */ 6047 @ViewDebug.ExportedProperty 6048 public boolean isHapticFeedbackEnabled() { 6049 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 6050 } 6051 6052 /** 6053 * Returns the layout direction for this view. 6054 * 6055 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 6056 * {@link #LAYOUT_DIRECTION_RTL}, 6057 * {@link #LAYOUT_DIRECTION_INHERIT} or 6058 * {@link #LAYOUT_DIRECTION_LOCALE}. 6059 * 6060 * @attr ref android.R.styleable#View_layoutDirection 6061 * 6062 * @hide 6063 */ 6064 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6065 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 6066 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 6067 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 6068 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 6069 }) 6070 public int getRawLayoutDirection() { 6071 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 6072 } 6073 6074 /** 6075 * Set the layout direction for this view. This will propagate a reset of layout direction 6076 * resolution to the view's children and resolve layout direction for this view. 6077 * 6078 * @param layoutDirection the layout direction to set. Should be one of: 6079 * 6080 * {@link #LAYOUT_DIRECTION_LTR}, 6081 * {@link #LAYOUT_DIRECTION_RTL}, 6082 * {@link #LAYOUT_DIRECTION_INHERIT}, 6083 * {@link #LAYOUT_DIRECTION_LOCALE}. 6084 * 6085 * Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution 6086 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 6087 * will return the default {@link #LAYOUT_DIRECTION_LTR}. 6088 * 6089 * @attr ref android.R.styleable#View_layoutDirection 6090 */ 6091 @RemotableViewMethod 6092 public void setLayoutDirection(int layoutDirection) { 6093 if (getRawLayoutDirection() != layoutDirection) { 6094 // Reset the current layout direction and the resolved one 6095 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK; 6096 resetRtlProperties(); 6097 // Set the new layout direction (filtered) 6098 mPrivateFlags2 |= 6099 ((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK); 6100 // We need to resolve all RTL properties as they all depend on layout direction 6101 resolveRtlPropertiesIfNeeded(); 6102 requestLayout(); 6103 invalidate(true); 6104 } 6105 } 6106 6107 /** 6108 * Returns the resolved layout direction for this view. 6109 * 6110 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 6111 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 6112 * 6113 * For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version 6114 * is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}. 6115 * 6116 * @attr ref android.R.styleable#View_layoutDirection 6117 */ 6118 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6119 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 6120 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 6121 }) 6122 public int getLayoutDirection() { 6123 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 6124 if (targetSdkVersion < JELLY_BEAN_MR1) { 6125 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 6126 return LAYOUT_DIRECTION_RESOLVED_DEFAULT; 6127 } 6128 return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) == 6129 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 6130 } 6131 6132 /** 6133 * Indicates whether or not this view's layout is right-to-left. This is resolved from 6134 * layout attribute and/or the inherited value from the parent 6135 * 6136 * @return true if the layout is right-to-left. 6137 * 6138 * @hide 6139 */ 6140 @ViewDebug.ExportedProperty(category = "layout") 6141 public boolean isLayoutRtl() { 6142 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL); 6143 } 6144 6145 /** 6146 * Indicates whether the view is currently tracking transient state that the 6147 * app should not need to concern itself with saving and restoring, but that 6148 * the framework should take special note to preserve when possible. 6149 * 6150 * <p>A view with transient state cannot be trivially rebound from an external 6151 * data source, such as an adapter binding item views in a list. This may be 6152 * because the view is performing an animation, tracking user selection 6153 * of content, or similar.</p> 6154 * 6155 * @return true if the view has transient state 6156 */ 6157 @ViewDebug.ExportedProperty(category = "layout") 6158 public boolean hasTransientState() { 6159 return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE; 6160 } 6161 6162 /** 6163 * Set whether this view is currently tracking transient state that the 6164 * framework should attempt to preserve when possible. This flag is reference counted, 6165 * so every call to setHasTransientState(true) should be paired with a later call 6166 * to setHasTransientState(false). 6167 * 6168 * <p>A view with transient state cannot be trivially rebound from an external 6169 * data source, such as an adapter binding item views in a list. This may be 6170 * because the view is performing an animation, tracking user selection 6171 * of content, or similar.</p> 6172 * 6173 * @param hasTransientState true if this view has transient state 6174 */ 6175 public void setHasTransientState(boolean hasTransientState) { 6176 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 6177 mTransientStateCount - 1; 6178 if (mTransientStateCount < 0) { 6179 mTransientStateCount = 0; 6180 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 6181 "unmatched pair of setHasTransientState calls"); 6182 } else if ((hasTransientState && mTransientStateCount == 1) || 6183 (!hasTransientState && mTransientStateCount == 0)) { 6184 // update flag if we've just incremented up from 0 or decremented down to 0 6185 mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) | 6186 (hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0); 6187 if (mParent != null) { 6188 try { 6189 mParent.childHasTransientStateChanged(this, hasTransientState); 6190 } catch (AbstractMethodError e) { 6191 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 6192 " does not fully implement ViewParent", e); 6193 } 6194 } 6195 } 6196 } 6197 6198 /** 6199 * Returns true if this view is currently attached to a window. 6200 */ 6201 public boolean isAttachedToWindow() { 6202 return mAttachInfo != null; 6203 } 6204 6205 /** 6206 * Returns true if this view has been through at least one layout since it 6207 * was last attached to or detached from a window. 6208 */ 6209 public boolean isLaidOut() { 6210 return (mPrivateFlags3 & PFLAG3_IS_LAID_OUT) == PFLAG3_IS_LAID_OUT; 6211 } 6212 6213 /** 6214 * If this view doesn't do any drawing on its own, set this flag to 6215 * allow further optimizations. By default, this flag is not set on 6216 * View, but could be set on some View subclasses such as ViewGroup. 6217 * 6218 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 6219 * you should clear this flag. 6220 * 6221 * @param willNotDraw whether or not this View draw on its own 6222 */ 6223 public void setWillNotDraw(boolean willNotDraw) { 6224 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 6225 } 6226 6227 /** 6228 * Returns whether or not this View draws on its own. 6229 * 6230 * @return true if this view has nothing to draw, false otherwise 6231 */ 6232 @ViewDebug.ExportedProperty(category = "drawing") 6233 public boolean willNotDraw() { 6234 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 6235 } 6236 6237 /** 6238 * When a View's drawing cache is enabled, drawing is redirected to an 6239 * offscreen bitmap. Some views, like an ImageView, must be able to 6240 * bypass this mechanism if they already draw a single bitmap, to avoid 6241 * unnecessary usage of the memory. 6242 * 6243 * @param willNotCacheDrawing true if this view does not cache its 6244 * drawing, false otherwise 6245 */ 6246 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 6247 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 6248 } 6249 6250 /** 6251 * Returns whether or not this View can cache its drawing or not. 6252 * 6253 * @return true if this view does not cache its drawing, false otherwise 6254 */ 6255 @ViewDebug.ExportedProperty(category = "drawing") 6256 public boolean willNotCacheDrawing() { 6257 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 6258 } 6259 6260 /** 6261 * Indicates whether this view reacts to click events or not. 6262 * 6263 * @return true if the view is clickable, false otherwise 6264 * 6265 * @see #setClickable(boolean) 6266 * @attr ref android.R.styleable#View_clickable 6267 */ 6268 @ViewDebug.ExportedProperty 6269 public boolean isClickable() { 6270 return (mViewFlags & CLICKABLE) == CLICKABLE; 6271 } 6272 6273 /** 6274 * Enables or disables click events for this view. When a view 6275 * is clickable it will change its state to "pressed" on every click. 6276 * Subclasses should set the view clickable to visually react to 6277 * user's clicks. 6278 * 6279 * @param clickable true to make the view clickable, false otherwise 6280 * 6281 * @see #isClickable() 6282 * @attr ref android.R.styleable#View_clickable 6283 */ 6284 public void setClickable(boolean clickable) { 6285 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 6286 } 6287 6288 /** 6289 * Indicates whether this view reacts to long click events or not. 6290 * 6291 * @return true if the view is long clickable, false otherwise 6292 * 6293 * @see #setLongClickable(boolean) 6294 * @attr ref android.R.styleable#View_longClickable 6295 */ 6296 public boolean isLongClickable() { 6297 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6298 } 6299 6300 /** 6301 * Enables or disables long click events for this view. When a view is long 6302 * clickable it reacts to the user holding down the button for a longer 6303 * duration than a tap. This event can either launch the listener or a 6304 * context menu. 6305 * 6306 * @param longClickable true to make the view long clickable, false otherwise 6307 * @see #isLongClickable() 6308 * @attr ref android.R.styleable#View_longClickable 6309 */ 6310 public void setLongClickable(boolean longClickable) { 6311 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 6312 } 6313 6314 /** 6315 * Sets the pressed state for this view. 6316 * 6317 * @see #isClickable() 6318 * @see #setClickable(boolean) 6319 * 6320 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 6321 * the View's internal state from a previously set "pressed" state. 6322 */ 6323 public void setPressed(boolean pressed) { 6324 final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED); 6325 6326 if (pressed) { 6327 mPrivateFlags |= PFLAG_PRESSED; 6328 } else { 6329 mPrivateFlags &= ~PFLAG_PRESSED; 6330 } 6331 6332 if (needsRefresh) { 6333 refreshDrawableState(); 6334 } 6335 dispatchSetPressed(pressed); 6336 } 6337 6338 /** 6339 * Dispatch setPressed to all of this View's children. 6340 * 6341 * @see #setPressed(boolean) 6342 * 6343 * @param pressed The new pressed state 6344 */ 6345 protected void dispatchSetPressed(boolean pressed) { 6346 } 6347 6348 /** 6349 * Indicates whether the view is currently in pressed state. Unless 6350 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 6351 * the pressed state. 6352 * 6353 * @see #setPressed(boolean) 6354 * @see #isClickable() 6355 * @see #setClickable(boolean) 6356 * 6357 * @return true if the view is currently pressed, false otherwise 6358 */ 6359 public boolean isPressed() { 6360 return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED; 6361 } 6362 6363 /** 6364 * Indicates whether this view will save its state (that is, 6365 * whether its {@link #onSaveInstanceState} method will be called). 6366 * 6367 * @return Returns true if the view state saving is enabled, else false. 6368 * 6369 * @see #setSaveEnabled(boolean) 6370 * @attr ref android.R.styleable#View_saveEnabled 6371 */ 6372 public boolean isSaveEnabled() { 6373 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 6374 } 6375 6376 /** 6377 * Controls whether the saving of this view's state is 6378 * enabled (that is, whether its {@link #onSaveInstanceState} method 6379 * will be called). Note that even if freezing is enabled, the 6380 * view still must have an id assigned to it (via {@link #setId(int)}) 6381 * for its state to be saved. This flag can only disable the 6382 * saving of this view; any child views may still have their state saved. 6383 * 6384 * @param enabled Set to false to <em>disable</em> state saving, or true 6385 * (the default) to allow it. 6386 * 6387 * @see #isSaveEnabled() 6388 * @see #setId(int) 6389 * @see #onSaveInstanceState() 6390 * @attr ref android.R.styleable#View_saveEnabled 6391 */ 6392 public void setSaveEnabled(boolean enabled) { 6393 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 6394 } 6395 6396 /** 6397 * Gets whether the framework should discard touches when the view's 6398 * window is obscured by another visible window. 6399 * Refer to the {@link View} security documentation for more details. 6400 * 6401 * @return True if touch filtering is enabled. 6402 * 6403 * @see #setFilterTouchesWhenObscured(boolean) 6404 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6405 */ 6406 @ViewDebug.ExportedProperty 6407 public boolean getFilterTouchesWhenObscured() { 6408 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 6409 } 6410 6411 /** 6412 * Sets whether the framework should discard touches when the view's 6413 * window is obscured by another visible window. 6414 * Refer to the {@link View} security documentation for more details. 6415 * 6416 * @param enabled True if touch filtering should be enabled. 6417 * 6418 * @see #getFilterTouchesWhenObscured 6419 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6420 */ 6421 public void setFilterTouchesWhenObscured(boolean enabled) { 6422 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 6423 FILTER_TOUCHES_WHEN_OBSCURED); 6424 } 6425 6426 /** 6427 * Indicates whether the entire hierarchy under this view will save its 6428 * state when a state saving traversal occurs from its parent. The default 6429 * is true; if false, these views will not be saved unless 6430 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6431 * 6432 * @return Returns true if the view state saving from parent is enabled, else false. 6433 * 6434 * @see #setSaveFromParentEnabled(boolean) 6435 */ 6436 public boolean isSaveFromParentEnabled() { 6437 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 6438 } 6439 6440 /** 6441 * Controls whether the entire hierarchy under this view will save its 6442 * state when a state saving traversal occurs from its parent. The default 6443 * is true; if false, these views will not be saved unless 6444 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6445 * 6446 * @param enabled Set to false to <em>disable</em> state saving, or true 6447 * (the default) to allow it. 6448 * 6449 * @see #isSaveFromParentEnabled() 6450 * @see #setId(int) 6451 * @see #onSaveInstanceState() 6452 */ 6453 public void setSaveFromParentEnabled(boolean enabled) { 6454 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 6455 } 6456 6457 6458 /** 6459 * Returns whether this View is able to take focus. 6460 * 6461 * @return True if this view can take focus, or false otherwise. 6462 * @attr ref android.R.styleable#View_focusable 6463 */ 6464 @ViewDebug.ExportedProperty(category = "focus") 6465 public final boolean isFocusable() { 6466 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 6467 } 6468 6469 /** 6470 * When a view is focusable, it may not want to take focus when in touch mode. 6471 * For example, a button would like focus when the user is navigating via a D-pad 6472 * so that the user can click on it, but once the user starts touching the screen, 6473 * the button shouldn't take focus 6474 * @return Whether the view is focusable in touch mode. 6475 * @attr ref android.R.styleable#View_focusableInTouchMode 6476 */ 6477 @ViewDebug.ExportedProperty 6478 public final boolean isFocusableInTouchMode() { 6479 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 6480 } 6481 6482 /** 6483 * Find the nearest view in the specified direction that can take focus. 6484 * This does not actually give focus to that view. 6485 * 6486 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6487 * 6488 * @return The nearest focusable in the specified direction, or null if none 6489 * can be found. 6490 */ 6491 public View focusSearch(int direction) { 6492 if (mParent != null) { 6493 return mParent.focusSearch(this, direction); 6494 } else { 6495 return null; 6496 } 6497 } 6498 6499 /** 6500 * This method is the last chance for the focused view and its ancestors to 6501 * respond to an arrow key. This is called when the focused view did not 6502 * consume the key internally, nor could the view system find a new view in 6503 * the requested direction to give focus to. 6504 * 6505 * @param focused The currently focused view. 6506 * @param direction The direction focus wants to move. One of FOCUS_UP, 6507 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 6508 * @return True if the this view consumed this unhandled move. 6509 */ 6510 public boolean dispatchUnhandledMove(View focused, int direction) { 6511 return false; 6512 } 6513 6514 /** 6515 * If a user manually specified the next view id for a particular direction, 6516 * use the root to look up the view. 6517 * @param root The root view of the hierarchy containing this view. 6518 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 6519 * or FOCUS_BACKWARD. 6520 * @return The user specified next view, or null if there is none. 6521 */ 6522 View findUserSetNextFocus(View root, int direction) { 6523 switch (direction) { 6524 case FOCUS_LEFT: 6525 if (mNextFocusLeftId == View.NO_ID) return null; 6526 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 6527 case FOCUS_RIGHT: 6528 if (mNextFocusRightId == View.NO_ID) return null; 6529 return findViewInsideOutShouldExist(root, mNextFocusRightId); 6530 case FOCUS_UP: 6531 if (mNextFocusUpId == View.NO_ID) return null; 6532 return findViewInsideOutShouldExist(root, mNextFocusUpId); 6533 case FOCUS_DOWN: 6534 if (mNextFocusDownId == View.NO_ID) return null; 6535 return findViewInsideOutShouldExist(root, mNextFocusDownId); 6536 case FOCUS_FORWARD: 6537 if (mNextFocusForwardId == View.NO_ID) return null; 6538 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 6539 case FOCUS_BACKWARD: { 6540 if (mID == View.NO_ID) return null; 6541 final int id = mID; 6542 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 6543 @Override 6544 public boolean apply(View t) { 6545 return t.mNextFocusForwardId == id; 6546 } 6547 }); 6548 } 6549 } 6550 return null; 6551 } 6552 6553 private View findViewInsideOutShouldExist(View root, int id) { 6554 if (mMatchIdPredicate == null) { 6555 mMatchIdPredicate = new MatchIdPredicate(); 6556 } 6557 mMatchIdPredicate.mId = id; 6558 View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate); 6559 if (result == null) { 6560 Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id); 6561 } 6562 return result; 6563 } 6564 6565 /** 6566 * Find and return all focusable views that are descendants of this view, 6567 * possibly including this view if it is focusable itself. 6568 * 6569 * @param direction The direction of the focus 6570 * @return A list of focusable views 6571 */ 6572 public ArrayList<View> getFocusables(int direction) { 6573 ArrayList<View> result = new ArrayList<View>(24); 6574 addFocusables(result, direction); 6575 return result; 6576 } 6577 6578 /** 6579 * Add any focusable views that are descendants of this view (possibly 6580 * including this view if it is focusable itself) to views. If we are in touch mode, 6581 * only add views that are also focusable in touch mode. 6582 * 6583 * @param views Focusable views found so far 6584 * @param direction The direction of the focus 6585 */ 6586 public void addFocusables(ArrayList<View> views, int direction) { 6587 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6588 } 6589 6590 /** 6591 * Adds any focusable views that are descendants of this view (possibly 6592 * including this view if it is focusable itself) to views. This method 6593 * adds all focusable views regardless if we are in touch mode or 6594 * only views focusable in touch mode if we are in touch mode or 6595 * only views that can take accessibility focus if accessibility is enabeld 6596 * depending on the focusable mode paramater. 6597 * 6598 * @param views Focusable views found so far or null if all we are interested is 6599 * the number of focusables. 6600 * @param direction The direction of the focus. 6601 * @param focusableMode The type of focusables to be added. 6602 * 6603 * @see #FOCUSABLES_ALL 6604 * @see #FOCUSABLES_TOUCH_MODE 6605 */ 6606 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6607 if (views == null) { 6608 return; 6609 } 6610 if (!isFocusable()) { 6611 return; 6612 } 6613 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6614 && isInTouchMode() && !isFocusableInTouchMode()) { 6615 return; 6616 } 6617 views.add(this); 6618 } 6619 6620 /** 6621 * Finds the Views that contain given text. The containment is case insensitive. 6622 * The search is performed by either the text that the View renders or the content 6623 * description that describes the view for accessibility purposes and the view does 6624 * not render or both. Clients can specify how the search is to be performed via 6625 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6626 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6627 * 6628 * @param outViews The output list of matching Views. 6629 * @param searched The text to match against. 6630 * 6631 * @see #FIND_VIEWS_WITH_TEXT 6632 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6633 * @see #setContentDescription(CharSequence) 6634 */ 6635 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6636 if (getAccessibilityNodeProvider() != null) { 6637 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6638 outViews.add(this); 6639 } 6640 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6641 && (searched != null && searched.length() > 0) 6642 && (mContentDescription != null && mContentDescription.length() > 0)) { 6643 String searchedLowerCase = searched.toString().toLowerCase(); 6644 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6645 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6646 outViews.add(this); 6647 } 6648 } 6649 } 6650 6651 /** 6652 * Find and return all touchable views that are descendants of this view, 6653 * possibly including this view if it is touchable itself. 6654 * 6655 * @return A list of touchable views 6656 */ 6657 public ArrayList<View> getTouchables() { 6658 ArrayList<View> result = new ArrayList<View>(); 6659 addTouchables(result); 6660 return result; 6661 } 6662 6663 /** 6664 * Add any touchable views that are descendants of this view (possibly 6665 * including this view if it is touchable itself) to views. 6666 * 6667 * @param views Touchable views found so far 6668 */ 6669 public void addTouchables(ArrayList<View> views) { 6670 final int viewFlags = mViewFlags; 6671 6672 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6673 && (viewFlags & ENABLED_MASK) == ENABLED) { 6674 views.add(this); 6675 } 6676 } 6677 6678 /** 6679 * Returns whether this View is accessibility focused. 6680 * 6681 * @return True if this View is accessibility focused. 6682 */ 6683 boolean isAccessibilityFocused() { 6684 return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0; 6685 } 6686 6687 /** 6688 * Call this to try to give accessibility focus to this view. 6689 * 6690 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6691 * returns false or the view is no visible or the view already has accessibility 6692 * focus. 6693 * 6694 * See also {@link #focusSearch(int)}, which is what you call to say that you 6695 * have focus, and you want your parent to look for the next one. 6696 * 6697 * @return Whether this view actually took accessibility focus. 6698 * 6699 * @hide 6700 */ 6701 public boolean requestAccessibilityFocus() { 6702 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6703 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6704 return false; 6705 } 6706 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6707 return false; 6708 } 6709 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) { 6710 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED; 6711 ViewRootImpl viewRootImpl = getViewRootImpl(); 6712 if (viewRootImpl != null) { 6713 viewRootImpl.setAccessibilityFocus(this, null); 6714 } 6715 invalidate(); 6716 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6717 return true; 6718 } 6719 return false; 6720 } 6721 6722 /** 6723 * Call this to try to clear accessibility focus of this view. 6724 * 6725 * See also {@link #focusSearch(int)}, which is what you call to say that you 6726 * have focus, and you want your parent to look for the next one. 6727 * 6728 * @hide 6729 */ 6730 public void clearAccessibilityFocus() { 6731 clearAccessibilityFocusNoCallbacks(); 6732 // Clear the global reference of accessibility focus if this 6733 // view or any of its descendants had accessibility focus. 6734 ViewRootImpl viewRootImpl = getViewRootImpl(); 6735 if (viewRootImpl != null) { 6736 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6737 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6738 viewRootImpl.setAccessibilityFocus(null, null); 6739 } 6740 } 6741 } 6742 6743 private void sendAccessibilityHoverEvent(int eventType) { 6744 // Since we are not delivering to a client accessibility events from not 6745 // important views (unless the clinet request that) we need to fire the 6746 // event from the deepest view exposed to the client. As a consequence if 6747 // the user crosses a not exposed view the client will see enter and exit 6748 // of the exposed predecessor followed by and enter and exit of that same 6749 // predecessor when entering and exiting the not exposed descendant. This 6750 // is fine since the client has a clear idea which view is hovered at the 6751 // price of a couple more events being sent. This is a simple and 6752 // working solution. 6753 View source = this; 6754 while (true) { 6755 if (source.includeForAccessibility()) { 6756 source.sendAccessibilityEvent(eventType); 6757 return; 6758 } 6759 ViewParent parent = source.getParent(); 6760 if (parent instanceof View) { 6761 source = (View) parent; 6762 } else { 6763 return; 6764 } 6765 } 6766 } 6767 6768 /** 6769 * Clears accessibility focus without calling any callback methods 6770 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6771 * is used for clearing accessibility focus when giving this focus to 6772 * another view. 6773 */ 6774 void clearAccessibilityFocusNoCallbacks() { 6775 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { 6776 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; 6777 invalidate(); 6778 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6779 } 6780 } 6781 6782 /** 6783 * Call this to try to give focus to a specific view or to one of its 6784 * descendants. 6785 * 6786 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6787 * false), or if it is focusable and it is not focusable in touch mode 6788 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6789 * 6790 * See also {@link #focusSearch(int)}, which is what you call to say that you 6791 * have focus, and you want your parent to look for the next one. 6792 * 6793 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6794 * {@link #FOCUS_DOWN} and <code>null</code>. 6795 * 6796 * @return Whether this view or one of its descendants actually took focus. 6797 */ 6798 public final boolean requestFocus() { 6799 return requestFocus(View.FOCUS_DOWN); 6800 } 6801 6802 /** 6803 * Call this to try to give focus to a specific view or to one of its 6804 * descendants and give it a hint about what direction focus is heading. 6805 * 6806 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6807 * false), or if it is focusable and it is not focusable in touch mode 6808 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6809 * 6810 * See also {@link #focusSearch(int)}, which is what you call to say that you 6811 * have focus, and you want your parent to look for the next one. 6812 * 6813 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6814 * <code>null</code> set for the previously focused rectangle. 6815 * 6816 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6817 * @return Whether this view or one of its descendants actually took focus. 6818 */ 6819 public final boolean requestFocus(int direction) { 6820 return requestFocus(direction, null); 6821 } 6822 6823 /** 6824 * Call this to try to give focus to a specific view or to one of its descendants 6825 * and give it hints about the direction and a specific rectangle that the focus 6826 * is coming from. The rectangle can help give larger views a finer grained hint 6827 * about where focus is coming from, and therefore, where to show selection, or 6828 * forward focus change internally. 6829 * 6830 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6831 * false), or if it is focusable and it is not focusable in touch mode 6832 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6833 * 6834 * A View will not take focus if it is not visible. 6835 * 6836 * A View will not take focus if one of its parents has 6837 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6838 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6839 * 6840 * See also {@link #focusSearch(int)}, which is what you call to say that you 6841 * have focus, and you want your parent to look for the next one. 6842 * 6843 * You may wish to override this method if your custom {@link View} has an internal 6844 * {@link View} that it wishes to forward the request to. 6845 * 6846 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6847 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6848 * to give a finer grained hint about where focus is coming from. May be null 6849 * if there is no hint. 6850 * @return Whether this view or one of its descendants actually took focus. 6851 */ 6852 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6853 return requestFocusNoSearch(direction, previouslyFocusedRect); 6854 } 6855 6856 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6857 // need to be focusable 6858 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6859 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6860 return false; 6861 } 6862 6863 // need to be focusable in touch mode if in touch mode 6864 if (isInTouchMode() && 6865 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6866 return false; 6867 } 6868 6869 // need to not have any parents blocking us 6870 if (hasAncestorThatBlocksDescendantFocus()) { 6871 return false; 6872 } 6873 6874 handleFocusGainInternal(direction, previouslyFocusedRect); 6875 return true; 6876 } 6877 6878 /** 6879 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6880 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6881 * touch mode to request focus when they are touched. 6882 * 6883 * @return Whether this view or one of its descendants actually took focus. 6884 * 6885 * @see #isInTouchMode() 6886 * 6887 */ 6888 public final boolean requestFocusFromTouch() { 6889 // Leave touch mode if we need to 6890 if (isInTouchMode()) { 6891 ViewRootImpl viewRoot = getViewRootImpl(); 6892 if (viewRoot != null) { 6893 viewRoot.ensureTouchMode(false); 6894 } 6895 } 6896 return requestFocus(View.FOCUS_DOWN); 6897 } 6898 6899 /** 6900 * @return Whether any ancestor of this view blocks descendant focus. 6901 */ 6902 private boolean hasAncestorThatBlocksDescendantFocus() { 6903 ViewParent ancestor = mParent; 6904 while (ancestor instanceof ViewGroup) { 6905 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6906 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6907 return true; 6908 } else { 6909 ancestor = vgAncestor.getParent(); 6910 } 6911 } 6912 return false; 6913 } 6914 6915 /** 6916 * Gets the mode for determining whether this View is important for accessibility 6917 * which is if it fires accessibility events and if it is reported to 6918 * accessibility services that query the screen. 6919 * 6920 * @return The mode for determining whether a View is important for accessibility. 6921 * 6922 * @attr ref android.R.styleable#View_importantForAccessibility 6923 * 6924 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6925 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6926 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6927 */ 6928 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6929 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), 6930 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), 6931 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no") 6932 }) 6933 public int getImportantForAccessibility() { 6934 return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6935 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6936 } 6937 6938 /** 6939 * Sets how to determine whether this view is important for accessibility 6940 * which is if it fires accessibility events and if it is reported to 6941 * accessibility services that query the screen. 6942 * 6943 * @param mode How to determine whether this view is important for accessibility. 6944 * 6945 * @attr ref android.R.styleable#View_importantForAccessibility 6946 * 6947 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6948 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6949 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6950 */ 6951 public void setImportantForAccessibility(int mode) { 6952 final boolean oldIncludeForAccessibility = includeForAccessibility(); 6953 if (mode != getImportantForAccessibility()) { 6954 mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6955 mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6956 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6957 if (oldIncludeForAccessibility != includeForAccessibility()) { 6958 notifySubtreeAccessibilityStateChangedIfNeeded(); 6959 } else { 6960 notifyViewAccessibilityStateChangedIfNeeded(); 6961 } 6962 } 6963 } 6964 6965 /** 6966 * Gets whether this view should be exposed for accessibility. 6967 * 6968 * @return Whether the view is exposed for accessibility. 6969 * 6970 * @hide 6971 */ 6972 public boolean isImportantForAccessibility() { 6973 final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6974 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6975 switch (mode) { 6976 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6977 return true; 6978 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6979 return false; 6980 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6981 return isActionableForAccessibility() || hasListenersForAccessibility() 6982 || getAccessibilityNodeProvider() != null; 6983 default: 6984 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6985 + mode); 6986 } 6987 } 6988 6989 /** 6990 * Gets the parent for accessibility purposes. Note that the parent for 6991 * accessibility is not necessary the immediate parent. It is the first 6992 * predecessor that is important for accessibility. 6993 * 6994 * @return The parent for accessibility purposes. 6995 */ 6996 public ViewParent getParentForAccessibility() { 6997 if (mParent instanceof View) { 6998 View parentView = (View) mParent; 6999 if (parentView.includeForAccessibility()) { 7000 return mParent; 7001 } else { 7002 return mParent.getParentForAccessibility(); 7003 } 7004 } 7005 return null; 7006 } 7007 7008 /** 7009 * Adds the children of a given View for accessibility. Since some Views are 7010 * not important for accessibility the children for accessibility are not 7011 * necessarily direct children of the view, rather they are the first level of 7012 * descendants important for accessibility. 7013 * 7014 * @param children The list of children for accessibility. 7015 */ 7016 public void addChildrenForAccessibility(ArrayList<View> children) { 7017 if (includeForAccessibility()) { 7018 children.add(this); 7019 } 7020 } 7021 7022 /** 7023 * Whether to regard this view for accessibility. A view is regarded for 7024 * accessibility if it is important for accessibility or the querying 7025 * accessibility service has explicitly requested that view not 7026 * important for accessibility are regarded. 7027 * 7028 * @return Whether to regard the view for accessibility. 7029 * 7030 * @hide 7031 */ 7032 public boolean includeForAccessibility() { 7033 //noinspection SimplifiableIfStatement 7034 if (mAttachInfo != null) { 7035 return (mAttachInfo.mAccessibilityFetchFlags 7036 & AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0 7037 || isImportantForAccessibility(); 7038 } 7039 return false; 7040 } 7041 7042 /** 7043 * Returns whether the View is considered actionable from 7044 * accessibility perspective. Such view are important for 7045 * accessibility. 7046 * 7047 * @return True if the view is actionable for accessibility. 7048 * 7049 * @hide 7050 */ 7051 public boolean isActionableForAccessibility() { 7052 return (isClickable() || isLongClickable() || isFocusable()); 7053 } 7054 7055 /** 7056 * Returns whether the View has registered callbacks wich makes it 7057 * important for accessibility. 7058 * 7059 * @return True if the view is actionable for accessibility. 7060 */ 7061 private boolean hasListenersForAccessibility() { 7062 ListenerInfo info = getListenerInfo(); 7063 return mTouchDelegate != null || info.mOnKeyListener != null 7064 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 7065 || info.mOnHoverListener != null || info.mOnDragListener != null; 7066 } 7067 7068 /** 7069 * Notifies that the accessibility state of this view changed. The change 7070 * is local to this view and does not represent structural changes such 7071 * as children and parent. For example, the view became focusable. The 7072 * notification is at at most once every 7073 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 7074 * to avoid unnecessary load to the system. Also once a view has a pending 7075 * notifucation this method is a NOP until the notification has been sent. 7076 * 7077 * @hide 7078 */ 7079 public void notifyViewAccessibilityStateChangedIfNeeded() { 7080 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 7081 return; 7082 } 7083 if (mSendViewStateChangedAccessibilityEvent == null) { 7084 mSendViewStateChangedAccessibilityEvent = 7085 new SendViewStateChangedAccessibilityEvent(); 7086 } 7087 mSendViewStateChangedAccessibilityEvent.runOrPost(); 7088 } 7089 7090 /** 7091 * Notifies that the accessibility state of this view changed. The change 7092 * is *not* local to this view and does represent structural changes such 7093 * as children and parent. For example, the view size changed. The 7094 * notification is at at most once every 7095 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 7096 * to avoid unnecessary load to the system. Also once a view has a pending 7097 * notifucation this method is a NOP until the notification has been sent. 7098 * 7099 * @hide 7100 */ 7101 public void notifySubtreeAccessibilityStateChangedIfNeeded() { 7102 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 7103 return; 7104 } 7105 if ((mPrivateFlags2 & PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED) == 0) { 7106 mPrivateFlags2 |= PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; 7107 if (mParent != null) { 7108 try { 7109 mParent.childAccessibilityStateChanged(this); 7110 } catch (AbstractMethodError e) { 7111 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 7112 " does not fully implement ViewParent", e); 7113 } 7114 } 7115 } 7116 } 7117 7118 /** 7119 * Reset the flag indicating the accessibility state of the subtree rooted 7120 * at this view changed. 7121 */ 7122 void resetSubtreeAccessibilityStateChanged() { 7123 mPrivateFlags2 &= ~PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; 7124 } 7125 7126 /** 7127 * Performs the specified accessibility action on the view. For 7128 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 7129 * <p> 7130 * If an {@link AccessibilityDelegate} has been specified via calling 7131 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 7132 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 7133 * is responsible for handling this call. 7134 * </p> 7135 * 7136 * @param action The action to perform. 7137 * @param arguments Optional action arguments. 7138 * @return Whether the action was performed. 7139 */ 7140 public boolean performAccessibilityAction(int action, Bundle arguments) { 7141 if (mAccessibilityDelegate != null) { 7142 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 7143 } else { 7144 return performAccessibilityActionInternal(action, arguments); 7145 } 7146 } 7147 7148 /** 7149 * @see #performAccessibilityAction(int, Bundle) 7150 * 7151 * Note: Called from the default {@link AccessibilityDelegate}. 7152 */ 7153 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 7154 switch (action) { 7155 case AccessibilityNodeInfo.ACTION_CLICK: { 7156 if (isClickable()) { 7157 performClick(); 7158 return true; 7159 } 7160 } break; 7161 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 7162 if (isLongClickable()) { 7163 performLongClick(); 7164 return true; 7165 } 7166 } break; 7167 case AccessibilityNodeInfo.ACTION_FOCUS: { 7168 if (!hasFocus()) { 7169 // Get out of touch mode since accessibility 7170 // wants to move focus around. 7171 getViewRootImpl().ensureTouchMode(false); 7172 return requestFocus(); 7173 } 7174 } break; 7175 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 7176 if (hasFocus()) { 7177 clearFocus(); 7178 return !isFocused(); 7179 } 7180 } break; 7181 case AccessibilityNodeInfo.ACTION_SELECT: { 7182 if (!isSelected()) { 7183 setSelected(true); 7184 return isSelected(); 7185 } 7186 } break; 7187 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 7188 if (isSelected()) { 7189 setSelected(false); 7190 return !isSelected(); 7191 } 7192 } break; 7193 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 7194 if (!isAccessibilityFocused()) { 7195 return requestAccessibilityFocus(); 7196 } 7197 } break; 7198 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 7199 if (isAccessibilityFocused()) { 7200 clearAccessibilityFocus(); 7201 return true; 7202 } 7203 } break; 7204 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 7205 if (arguments != null) { 7206 final int granularity = arguments.getInt( 7207 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7208 final boolean extendSelection = arguments.getBoolean( 7209 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7210 return traverseAtGranularity(granularity, true, extendSelection); 7211 } 7212 } break; 7213 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 7214 if (arguments != null) { 7215 final int granularity = arguments.getInt( 7216 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7217 final boolean extendSelection = arguments.getBoolean( 7218 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7219 return traverseAtGranularity(granularity, false, extendSelection); 7220 } 7221 } break; 7222 case AccessibilityNodeInfo.ACTION_SET_SELECTION: { 7223 CharSequence text = getIterableTextForAccessibility(); 7224 if (text == null) { 7225 return false; 7226 } 7227 final int start = (arguments != null) ? arguments.getInt( 7228 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, -1) : -1; 7229 final int end = (arguments != null) ? arguments.getInt( 7230 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, -1) : -1; 7231 // Only cursor position can be specified (selection length == 0) 7232 if ((getAccessibilitySelectionStart() != start 7233 || getAccessibilitySelectionEnd() != end) 7234 && (start == end)) { 7235 setAccessibilitySelection(start, end); 7236 notifyViewAccessibilityStateChangedIfNeeded(); 7237 return true; 7238 } 7239 } break; 7240 } 7241 return false; 7242 } 7243 7244 private boolean traverseAtGranularity(int granularity, boolean forward, 7245 boolean extendSelection) { 7246 CharSequence text = getIterableTextForAccessibility(); 7247 if (text == null || text.length() == 0) { 7248 return false; 7249 } 7250 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 7251 if (iterator == null) { 7252 return false; 7253 } 7254 int current = getAccessibilitySelectionEnd(); 7255 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7256 current = forward ? 0 : text.length(); 7257 } 7258 final int[] range = forward ? iterator.following(current) : iterator.preceding(current); 7259 if (range == null) { 7260 return false; 7261 } 7262 final int segmentStart = range[0]; 7263 final int segmentEnd = range[1]; 7264 int selectionStart; 7265 int selectionEnd; 7266 if (extendSelection && isAccessibilitySelectionExtendable()) { 7267 selectionStart = getAccessibilitySelectionStart(); 7268 if (selectionStart == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7269 selectionStart = forward ? segmentStart : segmentEnd; 7270 } 7271 selectionEnd = forward ? segmentEnd : segmentStart; 7272 } else { 7273 selectionStart = selectionEnd= forward ? segmentEnd : segmentStart; 7274 } 7275 setAccessibilitySelection(selectionStart, selectionEnd); 7276 final int action = forward ? AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY 7277 : AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY; 7278 sendViewTextTraversedAtGranularityEvent(action, granularity, segmentStart, segmentEnd); 7279 return true; 7280 } 7281 7282 /** 7283 * Gets the text reported for accessibility purposes. 7284 * 7285 * @return The accessibility text. 7286 * 7287 * @hide 7288 */ 7289 public CharSequence getIterableTextForAccessibility() { 7290 return getContentDescription(); 7291 } 7292 7293 /** 7294 * Gets whether accessibility selection can be extended. 7295 * 7296 * @return If selection is extensible. 7297 * 7298 * @hide 7299 */ 7300 public boolean isAccessibilitySelectionExtendable() { 7301 return false; 7302 } 7303 7304 /** 7305 * @hide 7306 */ 7307 public int getAccessibilitySelectionStart() { 7308 return mAccessibilityCursorPosition; 7309 } 7310 7311 /** 7312 * @hide 7313 */ 7314 public int getAccessibilitySelectionEnd() { 7315 return getAccessibilitySelectionStart(); 7316 } 7317 7318 /** 7319 * @hide 7320 */ 7321 public void setAccessibilitySelection(int start, int end) { 7322 if (start == end && end == mAccessibilityCursorPosition) { 7323 return; 7324 } 7325 if (start >= 0 && start == end && end <= getIterableTextForAccessibility().length()) { 7326 mAccessibilityCursorPosition = start; 7327 } else { 7328 mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 7329 } 7330 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED); 7331 } 7332 7333 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 7334 int fromIndex, int toIndex) { 7335 if (mParent == null) { 7336 return; 7337 } 7338 AccessibilityEvent event = AccessibilityEvent.obtain( 7339 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 7340 onInitializeAccessibilityEvent(event); 7341 onPopulateAccessibilityEvent(event); 7342 event.setFromIndex(fromIndex); 7343 event.setToIndex(toIndex); 7344 event.setAction(action); 7345 event.setMovementGranularity(granularity); 7346 mParent.requestSendAccessibilityEvent(this, event); 7347 } 7348 7349 /** 7350 * @hide 7351 */ 7352 public TextSegmentIterator getIteratorForGranularity(int granularity) { 7353 switch (granularity) { 7354 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 7355 CharSequence text = getIterableTextForAccessibility(); 7356 if (text != null && text.length() > 0) { 7357 CharacterTextSegmentIterator iterator = 7358 CharacterTextSegmentIterator.getInstance( 7359 mContext.getResources().getConfiguration().locale); 7360 iterator.initialize(text.toString()); 7361 return iterator; 7362 } 7363 } break; 7364 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 7365 CharSequence text = getIterableTextForAccessibility(); 7366 if (text != null && text.length() > 0) { 7367 WordTextSegmentIterator iterator = 7368 WordTextSegmentIterator.getInstance( 7369 mContext.getResources().getConfiguration().locale); 7370 iterator.initialize(text.toString()); 7371 return iterator; 7372 } 7373 } break; 7374 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 7375 CharSequence text = getIterableTextForAccessibility(); 7376 if (text != null && text.length() > 0) { 7377 ParagraphTextSegmentIterator iterator = 7378 ParagraphTextSegmentIterator.getInstance(); 7379 iterator.initialize(text.toString()); 7380 return iterator; 7381 } 7382 } break; 7383 } 7384 return null; 7385 } 7386 7387 /** 7388 * @hide 7389 */ 7390 public void dispatchStartTemporaryDetach() { 7391 clearAccessibilityFocus(); 7392 clearDisplayList(); 7393 7394 onStartTemporaryDetach(); 7395 } 7396 7397 /** 7398 * This is called when a container is going to temporarily detach a child, with 7399 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 7400 * It will either be followed by {@link #onFinishTemporaryDetach()} or 7401 * {@link #onDetachedFromWindow()} when the container is done. 7402 */ 7403 public void onStartTemporaryDetach() { 7404 removeUnsetPressCallback(); 7405 mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT; 7406 } 7407 7408 /** 7409 * @hide 7410 */ 7411 public void dispatchFinishTemporaryDetach() { 7412 onFinishTemporaryDetach(); 7413 } 7414 7415 /** 7416 * Called after {@link #onStartTemporaryDetach} when the container is done 7417 * changing the view. 7418 */ 7419 public void onFinishTemporaryDetach() { 7420 } 7421 7422 /** 7423 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 7424 * for this view's window. Returns null if the view is not currently attached 7425 * to the window. Normally you will not need to use this directly, but 7426 * just use the standard high-level event callbacks like 7427 * {@link #onKeyDown(int, KeyEvent)}. 7428 */ 7429 public KeyEvent.DispatcherState getKeyDispatcherState() { 7430 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 7431 } 7432 7433 /** 7434 * Dispatch a key event before it is processed by any input method 7435 * associated with the view hierarchy. This can be used to intercept 7436 * key events in special situations before the IME consumes them; a 7437 * typical example would be handling the BACK key to update the application's 7438 * UI instead of allowing the IME to see it and close itself. 7439 * 7440 * @param event The key event to be dispatched. 7441 * @return True if the event was handled, false otherwise. 7442 */ 7443 public boolean dispatchKeyEventPreIme(KeyEvent event) { 7444 return onKeyPreIme(event.getKeyCode(), event); 7445 } 7446 7447 /** 7448 * Dispatch a key event to the next view on the focus path. This path runs 7449 * from the top of the view tree down to the currently focused view. If this 7450 * view has focus, it will dispatch to itself. Otherwise it will dispatch 7451 * the next node down the focus path. This method also fires any key 7452 * listeners. 7453 * 7454 * @param event The key event to be dispatched. 7455 * @return True if the event was handled, false otherwise. 7456 */ 7457 public boolean dispatchKeyEvent(KeyEvent event) { 7458 if (mInputEventConsistencyVerifier != null) { 7459 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 7460 } 7461 7462 // Give any attached key listener a first crack at the event. 7463 //noinspection SimplifiableIfStatement 7464 ListenerInfo li = mListenerInfo; 7465 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7466 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 7467 return true; 7468 } 7469 7470 if (event.dispatch(this, mAttachInfo != null 7471 ? mAttachInfo.mKeyDispatchState : null, this)) { 7472 return true; 7473 } 7474 7475 if (mInputEventConsistencyVerifier != null) { 7476 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7477 } 7478 return false; 7479 } 7480 7481 /** 7482 * Dispatches a key shortcut event. 7483 * 7484 * @param event The key event to be dispatched. 7485 * @return True if the event was handled by the view, false otherwise. 7486 */ 7487 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 7488 return onKeyShortcut(event.getKeyCode(), event); 7489 } 7490 7491 /** 7492 * Pass the touch screen motion event down to the target view, or this 7493 * view if it is the target. 7494 * 7495 * @param event The motion event to be dispatched. 7496 * @return True if the event was handled by the view, false otherwise. 7497 */ 7498 public boolean dispatchTouchEvent(MotionEvent event) { 7499 if (mInputEventConsistencyVerifier != null) { 7500 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 7501 } 7502 7503 if (onFilterTouchEventForSecurity(event)) { 7504 //noinspection SimplifiableIfStatement 7505 ListenerInfo li = mListenerInfo; 7506 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7507 && li.mOnTouchListener.onTouch(this, event)) { 7508 return true; 7509 } 7510 7511 if (onTouchEvent(event)) { 7512 return true; 7513 } 7514 } 7515 7516 if (mInputEventConsistencyVerifier != null) { 7517 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7518 } 7519 return false; 7520 } 7521 7522 /** 7523 * Filter the touch event to apply security policies. 7524 * 7525 * @param event The motion event to be filtered. 7526 * @return True if the event should be dispatched, false if the event should be dropped. 7527 * 7528 * @see #getFilterTouchesWhenObscured 7529 */ 7530 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 7531 //noinspection RedundantIfStatement 7532 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 7533 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 7534 // Window is obscured, drop this touch. 7535 return false; 7536 } 7537 return true; 7538 } 7539 7540 /** 7541 * Pass a trackball motion event down to the focused view. 7542 * 7543 * @param event The motion event to be dispatched. 7544 * @return True if the event was handled by the view, false otherwise. 7545 */ 7546 public boolean dispatchTrackballEvent(MotionEvent event) { 7547 if (mInputEventConsistencyVerifier != null) { 7548 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 7549 } 7550 7551 return onTrackballEvent(event); 7552 } 7553 7554 /** 7555 * Dispatch a generic motion event. 7556 * <p> 7557 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7558 * are delivered to the view under the pointer. All other generic motion events are 7559 * delivered to the focused view. Hover events are handled specially and are delivered 7560 * to {@link #onHoverEvent(MotionEvent)}. 7561 * </p> 7562 * 7563 * @param event The motion event to be dispatched. 7564 * @return True if the event was handled by the view, false otherwise. 7565 */ 7566 public boolean dispatchGenericMotionEvent(MotionEvent event) { 7567 if (mInputEventConsistencyVerifier != null) { 7568 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 7569 } 7570 7571 final int source = event.getSource(); 7572 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7573 final int action = event.getAction(); 7574 if (action == MotionEvent.ACTION_HOVER_ENTER 7575 || action == MotionEvent.ACTION_HOVER_MOVE 7576 || action == MotionEvent.ACTION_HOVER_EXIT) { 7577 if (dispatchHoverEvent(event)) { 7578 return true; 7579 } 7580 } else if (dispatchGenericPointerEvent(event)) { 7581 return true; 7582 } 7583 } else if (dispatchGenericFocusedEvent(event)) { 7584 return true; 7585 } 7586 7587 if (dispatchGenericMotionEventInternal(event)) { 7588 return true; 7589 } 7590 7591 if (mInputEventConsistencyVerifier != null) { 7592 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7593 } 7594 return false; 7595 } 7596 7597 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 7598 //noinspection SimplifiableIfStatement 7599 ListenerInfo li = mListenerInfo; 7600 if (li != null && li.mOnGenericMotionListener != null 7601 && (mViewFlags & ENABLED_MASK) == ENABLED 7602 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 7603 return true; 7604 } 7605 7606 if (onGenericMotionEvent(event)) { 7607 return true; 7608 } 7609 7610 if (mInputEventConsistencyVerifier != null) { 7611 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7612 } 7613 return false; 7614 } 7615 7616 /** 7617 * Dispatch a hover event. 7618 * <p> 7619 * Do not call this method directly. 7620 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7621 * </p> 7622 * 7623 * @param event The motion event to be dispatched. 7624 * @return True if the event was handled by the view, false otherwise. 7625 */ 7626 protected boolean dispatchHoverEvent(MotionEvent event) { 7627 ListenerInfo li = mListenerInfo; 7628 //noinspection SimplifiableIfStatement 7629 if (li != null && li.mOnHoverListener != null 7630 && (mViewFlags & ENABLED_MASK) == ENABLED 7631 && li.mOnHoverListener.onHover(this, event)) { 7632 return true; 7633 } 7634 7635 return onHoverEvent(event); 7636 } 7637 7638 /** 7639 * Returns true if the view has a child to which it has recently sent 7640 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7641 * it does not have a hovered child, then it must be the innermost hovered view. 7642 * @hide 7643 */ 7644 protected boolean hasHoveredChild() { 7645 return false; 7646 } 7647 7648 /** 7649 * Dispatch a generic motion event to the view under the first pointer. 7650 * <p> 7651 * Do not call this method directly. 7652 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7653 * </p> 7654 * 7655 * @param event The motion event to be dispatched. 7656 * @return True if the event was handled by the view, false otherwise. 7657 */ 7658 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7659 return false; 7660 } 7661 7662 /** 7663 * Dispatch a generic motion event to the currently focused view. 7664 * <p> 7665 * Do not call this method directly. 7666 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7667 * </p> 7668 * 7669 * @param event The motion event to be dispatched. 7670 * @return True if the event was handled by the view, false otherwise. 7671 */ 7672 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7673 return false; 7674 } 7675 7676 /** 7677 * Dispatch a pointer event. 7678 * <p> 7679 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7680 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7681 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7682 * and should not be expected to handle other pointing device features. 7683 * </p> 7684 * 7685 * @param event The motion event to be dispatched. 7686 * @return True if the event was handled by the view, false otherwise. 7687 * @hide 7688 */ 7689 public final boolean dispatchPointerEvent(MotionEvent event) { 7690 if (event.isTouchEvent()) { 7691 return dispatchTouchEvent(event); 7692 } else { 7693 return dispatchGenericMotionEvent(event); 7694 } 7695 } 7696 7697 /** 7698 * Called when the window containing this view gains or loses window focus. 7699 * ViewGroups should override to route to their children. 7700 * 7701 * @param hasFocus True if the window containing this view now has focus, 7702 * false otherwise. 7703 */ 7704 public void dispatchWindowFocusChanged(boolean hasFocus) { 7705 onWindowFocusChanged(hasFocus); 7706 } 7707 7708 /** 7709 * Called when the window containing this view gains or loses focus. Note 7710 * that this is separate from view focus: to receive key events, both 7711 * your view and its window must have focus. If a window is displayed 7712 * on top of yours that takes input focus, then your own window will lose 7713 * focus but the view focus will remain unchanged. 7714 * 7715 * @param hasWindowFocus True if the window containing this view now has 7716 * focus, false otherwise. 7717 */ 7718 public void onWindowFocusChanged(boolean hasWindowFocus) { 7719 InputMethodManager imm = InputMethodManager.peekInstance(); 7720 if (!hasWindowFocus) { 7721 if (isPressed()) { 7722 setPressed(false); 7723 } 7724 if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7725 imm.focusOut(this); 7726 } 7727 removeLongPressCallback(); 7728 removeTapCallback(); 7729 onFocusLost(); 7730 } else if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7731 imm.focusIn(this); 7732 } 7733 refreshDrawableState(); 7734 } 7735 7736 /** 7737 * Returns true if this view is in a window that currently has window focus. 7738 * Note that this is not the same as the view itself having focus. 7739 * 7740 * @return True if this view is in a window that currently has window focus. 7741 */ 7742 public boolean hasWindowFocus() { 7743 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7744 } 7745 7746 /** 7747 * Dispatch a view visibility change down the view hierarchy. 7748 * ViewGroups should override to route to their children. 7749 * @param changedView The view whose visibility changed. Could be 'this' or 7750 * an ancestor view. 7751 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7752 * {@link #INVISIBLE} or {@link #GONE}. 7753 */ 7754 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7755 onVisibilityChanged(changedView, visibility); 7756 } 7757 7758 /** 7759 * Called when the visibility of the view or an ancestor of the view is changed. 7760 * @param changedView The view whose visibility changed. Could be 'this' or 7761 * an ancestor view. 7762 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7763 * {@link #INVISIBLE} or {@link #GONE}. 7764 */ 7765 protected void onVisibilityChanged(View changedView, int visibility) { 7766 if (visibility == VISIBLE) { 7767 if (mAttachInfo != null) { 7768 initialAwakenScrollBars(); 7769 } else { 7770 mPrivateFlags |= PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 7771 } 7772 } 7773 } 7774 7775 /** 7776 * Dispatch a hint about whether this view is displayed. For instance, when 7777 * a View moves out of the screen, it might receives a display hint indicating 7778 * the view is not displayed. Applications should not <em>rely</em> on this hint 7779 * as there is no guarantee that they will receive one. 7780 * 7781 * @param hint A hint about whether or not this view is displayed: 7782 * {@link #VISIBLE} or {@link #INVISIBLE}. 7783 */ 7784 public void dispatchDisplayHint(int hint) { 7785 onDisplayHint(hint); 7786 } 7787 7788 /** 7789 * Gives this view a hint about whether is displayed or not. For instance, when 7790 * a View moves out of the screen, it might receives a display hint indicating 7791 * the view is not displayed. Applications should not <em>rely</em> on this hint 7792 * as there is no guarantee that they will receive one. 7793 * 7794 * @param hint A hint about whether or not this view is displayed: 7795 * {@link #VISIBLE} or {@link #INVISIBLE}. 7796 */ 7797 protected void onDisplayHint(int hint) { 7798 } 7799 7800 /** 7801 * Dispatch a window visibility change down the view hierarchy. 7802 * ViewGroups should override to route to their children. 7803 * 7804 * @param visibility The new visibility of the window. 7805 * 7806 * @see #onWindowVisibilityChanged(int) 7807 */ 7808 public void dispatchWindowVisibilityChanged(int visibility) { 7809 onWindowVisibilityChanged(visibility); 7810 } 7811 7812 /** 7813 * Called when the window containing has change its visibility 7814 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7815 * that this tells you whether or not your window is being made visible 7816 * to the window manager; this does <em>not</em> tell you whether or not 7817 * your window is obscured by other windows on the screen, even if it 7818 * is itself visible. 7819 * 7820 * @param visibility The new visibility of the window. 7821 */ 7822 protected void onWindowVisibilityChanged(int visibility) { 7823 if (visibility == VISIBLE) { 7824 initialAwakenScrollBars(); 7825 } 7826 } 7827 7828 /** 7829 * Returns the current visibility of the window this view is attached to 7830 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7831 * 7832 * @return Returns the current visibility of the view's window. 7833 */ 7834 public int getWindowVisibility() { 7835 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7836 } 7837 7838 /** 7839 * Retrieve the overall visible display size in which the window this view is 7840 * attached to has been positioned in. This takes into account screen 7841 * decorations above the window, for both cases where the window itself 7842 * is being position inside of them or the window is being placed under 7843 * then and covered insets are used for the window to position its content 7844 * inside. In effect, this tells you the available area where content can 7845 * be placed and remain visible to users. 7846 * 7847 * <p>This function requires an IPC back to the window manager to retrieve 7848 * the requested information, so should not be used in performance critical 7849 * code like drawing. 7850 * 7851 * @param outRect Filled in with the visible display frame. If the view 7852 * is not attached to a window, this is simply the raw display size. 7853 */ 7854 public void getWindowVisibleDisplayFrame(Rect outRect) { 7855 if (mAttachInfo != null) { 7856 try { 7857 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7858 } catch (RemoteException e) { 7859 return; 7860 } 7861 // XXX This is really broken, and probably all needs to be done 7862 // in the window manager, and we need to know more about whether 7863 // we want the area behind or in front of the IME. 7864 final Rect insets = mAttachInfo.mVisibleInsets; 7865 outRect.left += insets.left; 7866 outRect.top += insets.top; 7867 outRect.right -= insets.right; 7868 outRect.bottom -= insets.bottom; 7869 return; 7870 } 7871 // The view is not attached to a display so we don't have a context. 7872 // Make a best guess about the display size. 7873 Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY); 7874 d.getRectSize(outRect); 7875 } 7876 7877 /** 7878 * Dispatch a notification about a resource configuration change down 7879 * the view hierarchy. 7880 * ViewGroups should override to route to their children. 7881 * 7882 * @param newConfig The new resource configuration. 7883 * 7884 * @see #onConfigurationChanged(android.content.res.Configuration) 7885 */ 7886 public void dispatchConfigurationChanged(Configuration newConfig) { 7887 onConfigurationChanged(newConfig); 7888 } 7889 7890 /** 7891 * Called when the current configuration of the resources being used 7892 * by the application have changed. You can use this to decide when 7893 * to reload resources that can changed based on orientation and other 7894 * configuration characterstics. You only need to use this if you are 7895 * not relying on the normal {@link android.app.Activity} mechanism of 7896 * recreating the activity instance upon a configuration change. 7897 * 7898 * @param newConfig The new resource configuration. 7899 */ 7900 protected void onConfigurationChanged(Configuration newConfig) { 7901 } 7902 7903 /** 7904 * Private function to aggregate all per-view attributes in to the view 7905 * root. 7906 */ 7907 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7908 performCollectViewAttributes(attachInfo, visibility); 7909 } 7910 7911 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7912 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7913 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7914 attachInfo.mKeepScreenOn = true; 7915 } 7916 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7917 ListenerInfo li = mListenerInfo; 7918 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7919 attachInfo.mHasSystemUiListeners = true; 7920 } 7921 } 7922 } 7923 7924 void needGlobalAttributesUpdate(boolean force) { 7925 final AttachInfo ai = mAttachInfo; 7926 if (ai != null && !ai.mRecomputeGlobalAttributes) { 7927 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7928 || ai.mHasSystemUiListeners) { 7929 ai.mRecomputeGlobalAttributes = true; 7930 } 7931 } 7932 } 7933 7934 /** 7935 * Returns whether the device is currently in touch mode. Touch mode is entered 7936 * once the user begins interacting with the device by touch, and affects various 7937 * things like whether focus is always visible to the user. 7938 * 7939 * @return Whether the device is in touch mode. 7940 */ 7941 @ViewDebug.ExportedProperty 7942 public boolean isInTouchMode() { 7943 if (mAttachInfo != null) { 7944 return mAttachInfo.mInTouchMode; 7945 } else { 7946 return ViewRootImpl.isInTouchMode(); 7947 } 7948 } 7949 7950 /** 7951 * Returns the context the view is running in, through which it can 7952 * access the current theme, resources, etc. 7953 * 7954 * @return The view's Context. 7955 */ 7956 @ViewDebug.CapturedViewProperty 7957 public final Context getContext() { 7958 return mContext; 7959 } 7960 7961 /** 7962 * Handle a key event before it is processed by any input method 7963 * associated with the view hierarchy. This can be used to intercept 7964 * key events in special situations before the IME consumes them; a 7965 * typical example would be handling the BACK key to update the application's 7966 * UI instead of allowing the IME to see it and close itself. 7967 * 7968 * @param keyCode The value in event.getKeyCode(). 7969 * @param event Description of the key event. 7970 * @return If you handled the event, return true. If you want to allow the 7971 * event to be handled by the next receiver, return false. 7972 */ 7973 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7974 return false; 7975 } 7976 7977 /** 7978 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7979 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7980 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7981 * is released, if the view is enabled and clickable. 7982 * 7983 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7984 * although some may elect to do so in some situations. Do not rely on this to 7985 * catch software key presses. 7986 * 7987 * @param keyCode A key code that represents the button pressed, from 7988 * {@link android.view.KeyEvent}. 7989 * @param event The KeyEvent object that defines the button action. 7990 */ 7991 public boolean onKeyDown(int keyCode, KeyEvent event) { 7992 boolean result = false; 7993 7994 if (KeyEvent.isConfirmKey(event.getKeyCode())) { 7995 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7996 return true; 7997 } 7998 // Long clickable items don't necessarily have to be clickable 7999 if (((mViewFlags & CLICKABLE) == CLICKABLE || 8000 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 8001 (event.getRepeatCount() == 0)) { 8002 setPressed(true); 8003 checkForLongClick(0); 8004 return true; 8005 } 8006 } 8007 return result; 8008 } 8009 8010 /** 8011 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 8012 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 8013 * the event). 8014 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8015 * although some may elect to do so in some situations. Do not rely on this to 8016 * catch software key presses. 8017 */ 8018 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 8019 return false; 8020 } 8021 8022 /** 8023 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 8024 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 8025 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 8026 * {@link KeyEvent#KEYCODE_ENTER} is released. 8027 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8028 * although some may elect to do so in some situations. Do not rely on this to 8029 * catch software key presses. 8030 * 8031 * @param keyCode A key code that represents the button pressed, from 8032 * {@link android.view.KeyEvent}. 8033 * @param event The KeyEvent object that defines the button action. 8034 */ 8035 public boolean onKeyUp(int keyCode, KeyEvent event) { 8036 boolean result = false; 8037 8038 switch (keyCode) { 8039 case KeyEvent.KEYCODE_DPAD_CENTER: 8040 case KeyEvent.KEYCODE_ENTER: { 8041 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 8042 return true; 8043 } 8044 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 8045 setPressed(false); 8046 8047 if (!mHasPerformedLongPress) { 8048 // This is a tap, so remove the longpress check 8049 removeLongPressCallback(); 8050 8051 result = performClick(); 8052 } 8053 } 8054 break; 8055 } 8056 } 8057 return result; 8058 } 8059 8060 /** 8061 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 8062 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 8063 * the event). 8064 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8065 * although some may elect to do so in some situations. Do not rely on this to 8066 * catch software key presses. 8067 * 8068 * @param keyCode A key code that represents the button pressed, from 8069 * {@link android.view.KeyEvent}. 8070 * @param repeatCount The number of times the action was made. 8071 * @param event The KeyEvent object that defines the button action. 8072 */ 8073 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 8074 return false; 8075 } 8076 8077 /** 8078 * Called on the focused view when a key shortcut event is not handled. 8079 * Override this method to implement local key shortcuts for the View. 8080 * Key shortcuts can also be implemented by setting the 8081 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 8082 * 8083 * @param keyCode The value in event.getKeyCode(). 8084 * @param event Description of the key event. 8085 * @return If you handled the event, return true. If you want to allow the 8086 * event to be handled by the next receiver, return false. 8087 */ 8088 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 8089 return false; 8090 } 8091 8092 /** 8093 * Check whether the called view is a text editor, in which case it 8094 * would make sense to automatically display a soft input window for 8095 * it. Subclasses should override this if they implement 8096 * {@link #onCreateInputConnection(EditorInfo)} to return true if 8097 * a call on that method would return a non-null InputConnection, and 8098 * they are really a first-class editor that the user would normally 8099 * start typing on when the go into a window containing your view. 8100 * 8101 * <p>The default implementation always returns false. This does 8102 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 8103 * will not be called or the user can not otherwise perform edits on your 8104 * view; it is just a hint to the system that this is not the primary 8105 * purpose of this view. 8106 * 8107 * @return Returns true if this view is a text editor, else false. 8108 */ 8109 public boolean onCheckIsTextEditor() { 8110 return false; 8111 } 8112 8113 /** 8114 * Create a new InputConnection for an InputMethod to interact 8115 * with the view. The default implementation returns null, since it doesn't 8116 * support input methods. You can override this to implement such support. 8117 * This is only needed for views that take focus and text input. 8118 * 8119 * <p>When implementing this, you probably also want to implement 8120 * {@link #onCheckIsTextEditor()} to indicate you will return a 8121 * non-null InputConnection. 8122 * 8123 * @param outAttrs Fill in with attribute information about the connection. 8124 */ 8125 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 8126 return null; 8127 } 8128 8129 /** 8130 * Called by the {@link android.view.inputmethod.InputMethodManager} 8131 * when a view who is not the current 8132 * input connection target is trying to make a call on the manager. The 8133 * default implementation returns false; you can override this to return 8134 * true for certain views if you are performing InputConnection proxying 8135 * to them. 8136 * @param view The View that is making the InputMethodManager call. 8137 * @return Return true to allow the call, false to reject. 8138 */ 8139 public boolean checkInputConnectionProxy(View view) { 8140 return false; 8141 } 8142 8143 /** 8144 * Show the context menu for this view. It is not safe to hold on to the 8145 * menu after returning from this method. 8146 * 8147 * You should normally not overload this method. Overload 8148 * {@link #onCreateContextMenu(ContextMenu)} or define an 8149 * {@link OnCreateContextMenuListener} to add items to the context menu. 8150 * 8151 * @param menu The context menu to populate 8152 */ 8153 public void createContextMenu(ContextMenu menu) { 8154 ContextMenuInfo menuInfo = getContextMenuInfo(); 8155 8156 // Sets the current menu info so all items added to menu will have 8157 // my extra info set. 8158 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 8159 8160 onCreateContextMenu(menu); 8161 ListenerInfo li = mListenerInfo; 8162 if (li != null && li.mOnCreateContextMenuListener != null) { 8163 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 8164 } 8165 8166 // Clear the extra information so subsequent items that aren't mine don't 8167 // have my extra info. 8168 ((MenuBuilder)menu).setCurrentMenuInfo(null); 8169 8170 if (mParent != null) { 8171 mParent.createContextMenu(menu); 8172 } 8173 } 8174 8175 /** 8176 * Views should implement this if they have extra information to associate 8177 * with the context menu. The return result is supplied as a parameter to 8178 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 8179 * callback. 8180 * 8181 * @return Extra information about the item for which the context menu 8182 * should be shown. This information will vary across different 8183 * subclasses of View. 8184 */ 8185 protected ContextMenuInfo getContextMenuInfo() { 8186 return null; 8187 } 8188 8189 /** 8190 * Views should implement this if the view itself is going to add items to 8191 * the context menu. 8192 * 8193 * @param menu the context menu to populate 8194 */ 8195 protected void onCreateContextMenu(ContextMenu menu) { 8196 } 8197 8198 /** 8199 * Implement this method to handle trackball motion events. The 8200 * <em>relative</em> movement of the trackball since the last event 8201 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 8202 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 8203 * that a movement of 1 corresponds to the user pressing one DPAD key (so 8204 * they will often be fractional values, representing the more fine-grained 8205 * movement information available from a trackball). 8206 * 8207 * @param event The motion event. 8208 * @return True if the event was handled, false otherwise. 8209 */ 8210 public boolean onTrackballEvent(MotionEvent event) { 8211 return false; 8212 } 8213 8214 /** 8215 * Implement this method to handle generic motion events. 8216 * <p> 8217 * Generic motion events describe joystick movements, mouse hovers, track pad 8218 * touches, scroll wheel movements and other input events. The 8219 * {@link MotionEvent#getSource() source} of the motion event specifies 8220 * the class of input that was received. Implementations of this method 8221 * must examine the bits in the source before processing the event. 8222 * The following code example shows how this is done. 8223 * </p><p> 8224 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 8225 * are delivered to the view under the pointer. All other generic motion events are 8226 * delivered to the focused view. 8227 * </p> 8228 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 8229 * if (event.isFromSource(InputDevice.SOURCE_CLASS_JOYSTICK)) { 8230 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 8231 * // process the joystick movement... 8232 * return true; 8233 * } 8234 * } 8235 * if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) { 8236 * switch (event.getAction()) { 8237 * case MotionEvent.ACTION_HOVER_MOVE: 8238 * // process the mouse hover movement... 8239 * return true; 8240 * case MotionEvent.ACTION_SCROLL: 8241 * // process the scroll wheel movement... 8242 * return true; 8243 * } 8244 * } 8245 * return super.onGenericMotionEvent(event); 8246 * }</pre> 8247 * 8248 * @param event The generic motion event being processed. 8249 * @return True if the event was handled, false otherwise. 8250 */ 8251 public boolean onGenericMotionEvent(MotionEvent event) { 8252 return false; 8253 } 8254 8255 /** 8256 * Implement this method to handle hover events. 8257 * <p> 8258 * This method is called whenever a pointer is hovering into, over, or out of the 8259 * bounds of a view and the view is not currently being touched. 8260 * Hover events are represented as pointer events with action 8261 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 8262 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 8263 * </p> 8264 * <ul> 8265 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 8266 * when the pointer enters the bounds of the view.</li> 8267 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 8268 * when the pointer has already entered the bounds of the view and has moved.</li> 8269 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 8270 * when the pointer has exited the bounds of the view or when the pointer is 8271 * about to go down due to a button click, tap, or similar user action that 8272 * causes the view to be touched.</li> 8273 * </ul> 8274 * <p> 8275 * The view should implement this method to return true to indicate that it is 8276 * handling the hover event, such as by changing its drawable state. 8277 * </p><p> 8278 * The default implementation calls {@link #setHovered} to update the hovered state 8279 * of the view when a hover enter or hover exit event is received, if the view 8280 * is enabled and is clickable. The default implementation also sends hover 8281 * accessibility events. 8282 * </p> 8283 * 8284 * @param event The motion event that describes the hover. 8285 * @return True if the view handled the hover event. 8286 * 8287 * @see #isHovered 8288 * @see #setHovered 8289 * @see #onHoverChanged 8290 */ 8291 public boolean onHoverEvent(MotionEvent event) { 8292 // The root view may receive hover (or touch) events that are outside the bounds of 8293 // the window. This code ensures that we only send accessibility events for 8294 // hovers that are actually within the bounds of the root view. 8295 final int action = event.getActionMasked(); 8296 if (!mSendingHoverAccessibilityEvents) { 8297 if ((action == MotionEvent.ACTION_HOVER_ENTER 8298 || action == MotionEvent.ACTION_HOVER_MOVE) 8299 && !hasHoveredChild() 8300 && pointInView(event.getX(), event.getY())) { 8301 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 8302 mSendingHoverAccessibilityEvents = true; 8303 } 8304 } else { 8305 if (action == MotionEvent.ACTION_HOVER_EXIT 8306 || (action == MotionEvent.ACTION_MOVE 8307 && !pointInView(event.getX(), event.getY()))) { 8308 mSendingHoverAccessibilityEvents = false; 8309 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 8310 // If the window does not have input focus we take away accessibility 8311 // focus as soon as the user stop hovering over the view. 8312 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 8313 getViewRootImpl().setAccessibilityFocus(null, null); 8314 } 8315 } 8316 } 8317 8318 if (isHoverable()) { 8319 switch (action) { 8320 case MotionEvent.ACTION_HOVER_ENTER: 8321 setHovered(true); 8322 break; 8323 case MotionEvent.ACTION_HOVER_EXIT: 8324 setHovered(false); 8325 break; 8326 } 8327 8328 // Dispatch the event to onGenericMotionEvent before returning true. 8329 // This is to provide compatibility with existing applications that 8330 // handled HOVER_MOVE events in onGenericMotionEvent and that would 8331 // break because of the new default handling for hoverable views 8332 // in onHoverEvent. 8333 // Note that onGenericMotionEvent will be called by default when 8334 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 8335 dispatchGenericMotionEventInternal(event); 8336 // The event was already handled by calling setHovered(), so always 8337 // return true. 8338 return true; 8339 } 8340 8341 return false; 8342 } 8343 8344 /** 8345 * Returns true if the view should handle {@link #onHoverEvent} 8346 * by calling {@link #setHovered} to change its hovered state. 8347 * 8348 * @return True if the view is hoverable. 8349 */ 8350 private boolean isHoverable() { 8351 final int viewFlags = mViewFlags; 8352 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8353 return false; 8354 } 8355 8356 return (viewFlags & CLICKABLE) == CLICKABLE 8357 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 8358 } 8359 8360 /** 8361 * Returns true if the view is currently hovered. 8362 * 8363 * @return True if the view is currently hovered. 8364 * 8365 * @see #setHovered 8366 * @see #onHoverChanged 8367 */ 8368 @ViewDebug.ExportedProperty 8369 public boolean isHovered() { 8370 return (mPrivateFlags & PFLAG_HOVERED) != 0; 8371 } 8372 8373 /** 8374 * Sets whether the view is currently hovered. 8375 * <p> 8376 * Calling this method also changes the drawable state of the view. This 8377 * enables the view to react to hover by using different drawable resources 8378 * to change its appearance. 8379 * </p><p> 8380 * The {@link #onHoverChanged} method is called when the hovered state changes. 8381 * </p> 8382 * 8383 * @param hovered True if the view is hovered. 8384 * 8385 * @see #isHovered 8386 * @see #onHoverChanged 8387 */ 8388 public void setHovered(boolean hovered) { 8389 if (hovered) { 8390 if ((mPrivateFlags & PFLAG_HOVERED) == 0) { 8391 mPrivateFlags |= PFLAG_HOVERED; 8392 refreshDrawableState(); 8393 onHoverChanged(true); 8394 } 8395 } else { 8396 if ((mPrivateFlags & PFLAG_HOVERED) != 0) { 8397 mPrivateFlags &= ~PFLAG_HOVERED; 8398 refreshDrawableState(); 8399 onHoverChanged(false); 8400 } 8401 } 8402 } 8403 8404 /** 8405 * Implement this method to handle hover state changes. 8406 * <p> 8407 * This method is called whenever the hover state changes as a result of a 8408 * call to {@link #setHovered}. 8409 * </p> 8410 * 8411 * @param hovered The current hover state, as returned by {@link #isHovered}. 8412 * 8413 * @see #isHovered 8414 * @see #setHovered 8415 */ 8416 public void onHoverChanged(boolean hovered) { 8417 } 8418 8419 /** 8420 * Implement this method to handle touch screen motion events. 8421 * 8422 * @param event The motion event. 8423 * @return True if the event was handled, false otherwise. 8424 */ 8425 public boolean onTouchEvent(MotionEvent event) { 8426 final int viewFlags = mViewFlags; 8427 8428 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8429 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) { 8430 setPressed(false); 8431 } 8432 // A disabled view that is clickable still consumes the touch 8433 // events, it just doesn't respond to them. 8434 return (((viewFlags & CLICKABLE) == CLICKABLE || 8435 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 8436 } 8437 8438 if (mTouchDelegate != null) { 8439 if (mTouchDelegate.onTouchEvent(event)) { 8440 return true; 8441 } 8442 } 8443 8444 if (((viewFlags & CLICKABLE) == CLICKABLE || 8445 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 8446 switch (event.getAction()) { 8447 case MotionEvent.ACTION_UP: 8448 boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0; 8449 if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) { 8450 // take focus if we don't have it already and we should in 8451 // touch mode. 8452 boolean focusTaken = false; 8453 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 8454 focusTaken = requestFocus(); 8455 } 8456 8457 if (prepressed) { 8458 // The button is being released before we actually 8459 // showed it as pressed. Make it show the pressed 8460 // state now (before scheduling the click) to ensure 8461 // the user sees it. 8462 setPressed(true); 8463 } 8464 8465 if (!mHasPerformedLongPress) { 8466 // This is a tap, so remove the longpress check 8467 removeLongPressCallback(); 8468 8469 // Only perform take click actions if we were in the pressed state 8470 if (!focusTaken) { 8471 // Use a Runnable and post this rather than calling 8472 // performClick directly. This lets other visual state 8473 // of the view update before click actions start. 8474 if (mPerformClick == null) { 8475 mPerformClick = new PerformClick(); 8476 } 8477 if (!post(mPerformClick)) { 8478 performClick(); 8479 } 8480 } 8481 } 8482 8483 if (mUnsetPressedState == null) { 8484 mUnsetPressedState = new UnsetPressedState(); 8485 } 8486 8487 if (prepressed) { 8488 postDelayed(mUnsetPressedState, 8489 ViewConfiguration.getPressedStateDuration()); 8490 } else if (!post(mUnsetPressedState)) { 8491 // If the post failed, unpress right now 8492 mUnsetPressedState.run(); 8493 } 8494 removeTapCallback(); 8495 } 8496 break; 8497 8498 case MotionEvent.ACTION_DOWN: 8499 mHasPerformedLongPress = false; 8500 8501 if (performButtonActionOnTouchDown(event)) { 8502 break; 8503 } 8504 8505 // Walk up the hierarchy to determine if we're inside a scrolling container. 8506 boolean isInScrollingContainer = isInScrollingContainer(); 8507 8508 // For views inside a scrolling container, delay the pressed feedback for 8509 // a short period in case this is a scroll. 8510 if (isInScrollingContainer) { 8511 mPrivateFlags |= PFLAG_PREPRESSED; 8512 if (mPendingCheckForTap == null) { 8513 mPendingCheckForTap = new CheckForTap(); 8514 } 8515 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 8516 } else { 8517 // Not inside a scrolling container, so show the feedback right away 8518 setPressed(true); 8519 checkForLongClick(0); 8520 } 8521 break; 8522 8523 case MotionEvent.ACTION_CANCEL: 8524 setPressed(false); 8525 removeTapCallback(); 8526 removeLongPressCallback(); 8527 break; 8528 8529 case MotionEvent.ACTION_MOVE: 8530 final int x = (int) event.getX(); 8531 final int y = (int) event.getY(); 8532 8533 // Be lenient about moving outside of buttons 8534 if (!pointInView(x, y, mTouchSlop)) { 8535 // Outside button 8536 removeTapCallback(); 8537 if ((mPrivateFlags & PFLAG_PRESSED) != 0) { 8538 // Remove any future long press/tap checks 8539 removeLongPressCallback(); 8540 8541 setPressed(false); 8542 } 8543 } 8544 break; 8545 } 8546 return true; 8547 } 8548 8549 return false; 8550 } 8551 8552 /** 8553 * @hide 8554 */ 8555 public boolean isInScrollingContainer() { 8556 ViewParent p = getParent(); 8557 while (p != null && p instanceof ViewGroup) { 8558 if (((ViewGroup) p).shouldDelayChildPressedState()) { 8559 return true; 8560 } 8561 p = p.getParent(); 8562 } 8563 return false; 8564 } 8565 8566 /** 8567 * Remove the longpress detection timer. 8568 */ 8569 private void removeLongPressCallback() { 8570 if (mPendingCheckForLongPress != null) { 8571 removeCallbacks(mPendingCheckForLongPress); 8572 } 8573 } 8574 8575 /** 8576 * Remove the pending click action 8577 */ 8578 private void removePerformClickCallback() { 8579 if (mPerformClick != null) { 8580 removeCallbacks(mPerformClick); 8581 } 8582 } 8583 8584 /** 8585 * Remove the prepress detection timer. 8586 */ 8587 private void removeUnsetPressCallback() { 8588 if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) { 8589 setPressed(false); 8590 removeCallbacks(mUnsetPressedState); 8591 } 8592 } 8593 8594 /** 8595 * Remove the tap detection timer. 8596 */ 8597 private void removeTapCallback() { 8598 if (mPendingCheckForTap != null) { 8599 mPrivateFlags &= ~PFLAG_PREPRESSED; 8600 removeCallbacks(mPendingCheckForTap); 8601 } 8602 } 8603 8604 /** 8605 * Cancels a pending long press. Your subclass can use this if you 8606 * want the context menu to come up if the user presses and holds 8607 * at the same place, but you don't want it to come up if they press 8608 * and then move around enough to cause scrolling. 8609 */ 8610 public void cancelLongPress() { 8611 removeLongPressCallback(); 8612 8613 /* 8614 * The prepressed state handled by the tap callback is a display 8615 * construct, but the tap callback will post a long press callback 8616 * less its own timeout. Remove it here. 8617 */ 8618 removeTapCallback(); 8619 } 8620 8621 /** 8622 * Remove the pending callback for sending a 8623 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8624 */ 8625 private void removeSendViewScrolledAccessibilityEventCallback() { 8626 if (mSendViewScrolledAccessibilityEvent != null) { 8627 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8628 mSendViewScrolledAccessibilityEvent.mIsPending = false; 8629 } 8630 } 8631 8632 /** 8633 * Sets the TouchDelegate for this View. 8634 */ 8635 public void setTouchDelegate(TouchDelegate delegate) { 8636 mTouchDelegate = delegate; 8637 } 8638 8639 /** 8640 * Gets the TouchDelegate for this View. 8641 */ 8642 public TouchDelegate getTouchDelegate() { 8643 return mTouchDelegate; 8644 } 8645 8646 /** 8647 * Set flags controlling behavior of this view. 8648 * 8649 * @param flags Constant indicating the value which should be set 8650 * @param mask Constant indicating the bit range that should be changed 8651 */ 8652 void setFlags(int flags, int mask) { 8653 final boolean accessibilityEnabled = 8654 AccessibilityManager.getInstance(mContext).isEnabled(); 8655 final boolean oldIncludeForAccessibility = accessibilityEnabled && includeForAccessibility(); 8656 8657 int old = mViewFlags; 8658 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8659 8660 int changed = mViewFlags ^ old; 8661 if (changed == 0) { 8662 return; 8663 } 8664 int privateFlags = mPrivateFlags; 8665 8666 /* Check if the FOCUSABLE bit has changed */ 8667 if (((changed & FOCUSABLE_MASK) != 0) && 8668 ((privateFlags & PFLAG_HAS_BOUNDS) !=0)) { 8669 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8670 && ((privateFlags & PFLAG_FOCUSED) != 0)) { 8671 /* Give up focus if we are no longer focusable */ 8672 clearFocus(); 8673 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8674 && ((privateFlags & PFLAG_FOCUSED) == 0)) { 8675 /* 8676 * Tell the view system that we are now available to take focus 8677 * if no one else already has it. 8678 */ 8679 if (mParent != null) mParent.focusableViewAvailable(this); 8680 } 8681 } 8682 8683 final int newVisibility = flags & VISIBILITY_MASK; 8684 if (newVisibility == VISIBLE) { 8685 if ((changed & VISIBILITY_MASK) != 0) { 8686 /* 8687 * If this view is becoming visible, invalidate it in case it changed while 8688 * it was not visible. Marking it drawn ensures that the invalidation will 8689 * go through. 8690 */ 8691 mPrivateFlags |= PFLAG_DRAWN; 8692 invalidate(true); 8693 8694 needGlobalAttributesUpdate(true); 8695 8696 // a view becoming visible is worth notifying the parent 8697 // about in case nothing has focus. even if this specific view 8698 // isn't focusable, it may contain something that is, so let 8699 // the root view try to give this focus if nothing else does. 8700 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8701 mParent.focusableViewAvailable(this); 8702 } 8703 } 8704 } 8705 8706 /* Check if the GONE bit has changed */ 8707 if ((changed & GONE) != 0) { 8708 needGlobalAttributesUpdate(false); 8709 requestLayout(); 8710 8711 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8712 if (hasFocus()) clearFocus(); 8713 clearAccessibilityFocus(); 8714 destroyDrawingCache(); 8715 if (mParent instanceof View) { 8716 // GONE views noop invalidation, so invalidate the parent 8717 ((View) mParent).invalidate(true); 8718 } 8719 // Mark the view drawn to ensure that it gets invalidated properly the next 8720 // time it is visible and gets invalidated 8721 mPrivateFlags |= PFLAG_DRAWN; 8722 } 8723 if (mAttachInfo != null) { 8724 mAttachInfo.mViewVisibilityChanged = true; 8725 } 8726 } 8727 8728 /* Check if the VISIBLE bit has changed */ 8729 if ((changed & INVISIBLE) != 0) { 8730 needGlobalAttributesUpdate(false); 8731 /* 8732 * If this view is becoming invisible, set the DRAWN flag so that 8733 * the next invalidate() will not be skipped. 8734 */ 8735 mPrivateFlags |= PFLAG_DRAWN; 8736 8737 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8738 // root view becoming invisible shouldn't clear focus and accessibility focus 8739 if (getRootView() != this) { 8740 clearFocus(); 8741 clearAccessibilityFocus(); 8742 } 8743 } 8744 if (mAttachInfo != null) { 8745 mAttachInfo.mViewVisibilityChanged = true; 8746 } 8747 } 8748 8749 if ((changed & VISIBILITY_MASK) != 0) { 8750 // If the view is invisible, cleanup its display list to free up resources 8751 if (newVisibility != VISIBLE) { 8752 cleanupDraw(); 8753 } 8754 8755 if (mParent instanceof ViewGroup) { 8756 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8757 (changed & VISIBILITY_MASK), newVisibility); 8758 ((View) mParent).invalidate(true); 8759 } else if (mParent != null) { 8760 mParent.invalidateChild(this, null); 8761 } 8762 dispatchVisibilityChanged(this, newVisibility); 8763 } 8764 8765 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8766 destroyDrawingCache(); 8767 } 8768 8769 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8770 destroyDrawingCache(); 8771 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8772 invalidateParentCaches(); 8773 } 8774 8775 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8776 destroyDrawingCache(); 8777 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8778 } 8779 8780 if ((changed & DRAW_MASK) != 0) { 8781 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8782 if (mBackground != null) { 8783 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8784 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 8785 } else { 8786 mPrivateFlags |= PFLAG_SKIP_DRAW; 8787 } 8788 } else { 8789 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8790 } 8791 requestLayout(); 8792 invalidate(true); 8793 } 8794 8795 if ((changed & KEEP_SCREEN_ON) != 0) { 8796 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8797 mParent.recomputeViewAttributes(this); 8798 } 8799 } 8800 8801 if (accessibilityEnabled) { 8802 if ((changed & FOCUSABLE_MASK) != 0 || (changed & VISIBILITY_MASK) != 0 8803 || (changed & CLICKABLE) != 0 || (changed & LONG_CLICKABLE) != 0) { 8804 if (oldIncludeForAccessibility != includeForAccessibility()) { 8805 notifySubtreeAccessibilityStateChangedIfNeeded(); 8806 } else { 8807 notifyViewAccessibilityStateChangedIfNeeded(); 8808 } 8809 } 8810 if ((changed & ENABLED_MASK) != 0) { 8811 notifyViewAccessibilityStateChangedIfNeeded(); 8812 } 8813 } 8814 } 8815 8816 /** 8817 * Change the view's z order in the tree, so it's on top of other sibling 8818 * views. This ordering change may affect layout, if the parent container 8819 * uses an order-dependent layout scheme (e.g., LinearLayout). This 8820 * method should be followed by calls to {@link #requestLayout()} and 8821 * {@link View#invalidate()} on the parent. 8822 * 8823 * @see ViewGroup#bringChildToFront(View) 8824 */ 8825 public void bringToFront() { 8826 if (mParent != null) { 8827 mParent.bringChildToFront(this); 8828 } 8829 } 8830 8831 /** 8832 * This is called in response to an internal scroll in this view (i.e., the 8833 * view scrolled its own contents). This is typically as a result of 8834 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8835 * called. 8836 * 8837 * @param l Current horizontal scroll origin. 8838 * @param t Current vertical scroll origin. 8839 * @param oldl Previous horizontal scroll origin. 8840 * @param oldt Previous vertical scroll origin. 8841 */ 8842 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8843 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8844 postSendViewScrolledAccessibilityEventCallback(); 8845 } 8846 8847 mBackgroundSizeChanged = true; 8848 8849 final AttachInfo ai = mAttachInfo; 8850 if (ai != null) { 8851 ai.mViewScrollChanged = true; 8852 } 8853 } 8854 8855 /** 8856 * Interface definition for a callback to be invoked when the layout bounds of a view 8857 * changes due to layout processing. 8858 */ 8859 public interface OnLayoutChangeListener { 8860 /** 8861 * Called when the focus state of a view has changed. 8862 * 8863 * @param v The view whose state has changed. 8864 * @param left The new value of the view's left property. 8865 * @param top The new value of the view's top property. 8866 * @param right The new value of the view's right property. 8867 * @param bottom The new value of the view's bottom property. 8868 * @param oldLeft The previous value of the view's left property. 8869 * @param oldTop The previous value of the view's top property. 8870 * @param oldRight The previous value of the view's right property. 8871 * @param oldBottom The previous value of the view's bottom property. 8872 */ 8873 void onLayoutChange(View v, int left, int top, int right, int bottom, 8874 int oldLeft, int oldTop, int oldRight, int oldBottom); 8875 } 8876 8877 /** 8878 * This is called during layout when the size of this view has changed. If 8879 * you were just added to the view hierarchy, you're called with the old 8880 * values of 0. 8881 * 8882 * @param w Current width of this view. 8883 * @param h Current height of this view. 8884 * @param oldw Old width of this view. 8885 * @param oldh Old height of this view. 8886 */ 8887 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8888 } 8889 8890 /** 8891 * Called by draw to draw the child views. This may be overridden 8892 * by derived classes to gain control just before its children are drawn 8893 * (but after its own view has been drawn). 8894 * @param canvas the canvas on which to draw the view 8895 */ 8896 protected void dispatchDraw(Canvas canvas) { 8897 8898 } 8899 8900 /** 8901 * Gets the parent of this view. Note that the parent is a 8902 * ViewParent and not necessarily a View. 8903 * 8904 * @return Parent of this view. 8905 */ 8906 public final ViewParent getParent() { 8907 return mParent; 8908 } 8909 8910 /** 8911 * Set the horizontal scrolled position of your view. This will cause a call to 8912 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8913 * invalidated. 8914 * @param value the x position to scroll to 8915 */ 8916 public void setScrollX(int value) { 8917 scrollTo(value, mScrollY); 8918 } 8919 8920 /** 8921 * Set the vertical scrolled position of your view. This will cause a call to 8922 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8923 * invalidated. 8924 * @param value the y position to scroll to 8925 */ 8926 public void setScrollY(int value) { 8927 scrollTo(mScrollX, value); 8928 } 8929 8930 /** 8931 * Return the scrolled left position of this view. This is the left edge of 8932 * the displayed part of your view. You do not need to draw any pixels 8933 * farther left, since those are outside of the frame of your view on 8934 * screen. 8935 * 8936 * @return The left edge of the displayed part of your view, in pixels. 8937 */ 8938 public final int getScrollX() { 8939 return mScrollX; 8940 } 8941 8942 /** 8943 * Return the scrolled top position of this view. This is the top edge of 8944 * the displayed part of your view. You do not need to draw any pixels above 8945 * it, since those are outside of the frame of your view on screen. 8946 * 8947 * @return The top edge of the displayed part of your view, in pixels. 8948 */ 8949 public final int getScrollY() { 8950 return mScrollY; 8951 } 8952 8953 /** 8954 * Return the width of the your view. 8955 * 8956 * @return The width of your view, in pixels. 8957 */ 8958 @ViewDebug.ExportedProperty(category = "layout") 8959 public final int getWidth() { 8960 return mRight - mLeft; 8961 } 8962 8963 /** 8964 * Return the height of your view. 8965 * 8966 * @return The height of your view, in pixels. 8967 */ 8968 @ViewDebug.ExportedProperty(category = "layout") 8969 public final int getHeight() { 8970 return mBottom - mTop; 8971 } 8972 8973 /** 8974 * Return the visible drawing bounds of your view. Fills in the output 8975 * rectangle with the values from getScrollX(), getScrollY(), 8976 * getWidth(), and getHeight(). These bounds do not account for any 8977 * transformation properties currently set on the view, such as 8978 * {@link #setScaleX(float)} or {@link #setRotation(float)}. 8979 * 8980 * @param outRect The (scrolled) drawing bounds of the view. 8981 */ 8982 public void getDrawingRect(Rect outRect) { 8983 outRect.left = mScrollX; 8984 outRect.top = mScrollY; 8985 outRect.right = mScrollX + (mRight - mLeft); 8986 outRect.bottom = mScrollY + (mBottom - mTop); 8987 } 8988 8989 /** 8990 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8991 * raw width component (that is the result is masked by 8992 * {@link #MEASURED_SIZE_MASK}). 8993 * 8994 * @return The raw measured width of this view. 8995 */ 8996 public final int getMeasuredWidth() { 8997 return mMeasuredWidth & MEASURED_SIZE_MASK; 8998 } 8999 9000 /** 9001 * Return the full width measurement information for this view as computed 9002 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 9003 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 9004 * This should be used during measurement and layout calculations only. Use 9005 * {@link #getWidth()} to see how wide a view is after layout. 9006 * 9007 * @return The measured width of this view as a bit mask. 9008 */ 9009 public final int getMeasuredWidthAndState() { 9010 return mMeasuredWidth; 9011 } 9012 9013 /** 9014 * Like {@link #getMeasuredHeightAndState()}, but only returns the 9015 * raw width component (that is the result is masked by 9016 * {@link #MEASURED_SIZE_MASK}). 9017 * 9018 * @return The raw measured height of this view. 9019 */ 9020 public final int getMeasuredHeight() { 9021 return mMeasuredHeight & MEASURED_SIZE_MASK; 9022 } 9023 9024 /** 9025 * Return the full height measurement information for this view as computed 9026 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 9027 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 9028 * This should be used during measurement and layout calculations only. Use 9029 * {@link #getHeight()} to see how wide a view is after layout. 9030 * 9031 * @return The measured width of this view as a bit mask. 9032 */ 9033 public final int getMeasuredHeightAndState() { 9034 return mMeasuredHeight; 9035 } 9036 9037 /** 9038 * Return only the state bits of {@link #getMeasuredWidthAndState()} 9039 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 9040 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 9041 * and the height component is at the shifted bits 9042 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 9043 */ 9044 public final int getMeasuredState() { 9045 return (mMeasuredWidth&MEASURED_STATE_MASK) 9046 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 9047 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 9048 } 9049 9050 /** 9051 * The transform matrix of this view, which is calculated based on the current 9052 * roation, scale, and pivot properties. 9053 * 9054 * @see #getRotation() 9055 * @see #getScaleX() 9056 * @see #getScaleY() 9057 * @see #getPivotX() 9058 * @see #getPivotY() 9059 * @return The current transform matrix for the view 9060 */ 9061 public Matrix getMatrix() { 9062 if (mTransformationInfo != null) { 9063 updateMatrix(); 9064 return mTransformationInfo.mMatrix; 9065 } 9066 return Matrix.IDENTITY_MATRIX; 9067 } 9068 9069 /** 9070 * Utility function to determine if the value is far enough away from zero to be 9071 * considered non-zero. 9072 * @param value A floating point value to check for zero-ness 9073 * @return whether the passed-in value is far enough away from zero to be considered non-zero 9074 */ 9075 private static boolean nonzero(float value) { 9076 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 9077 } 9078 9079 /** 9080 * Returns true if the transform matrix is the identity matrix. 9081 * Recomputes the matrix if necessary. 9082 * 9083 * @return True if the transform matrix is the identity matrix, false otherwise. 9084 */ 9085 final boolean hasIdentityMatrix() { 9086 if (mTransformationInfo != null) { 9087 updateMatrix(); 9088 return mTransformationInfo.mMatrixIsIdentity; 9089 } 9090 return true; 9091 } 9092 9093 void ensureTransformationInfo() { 9094 if (mTransformationInfo == null) { 9095 mTransformationInfo = new TransformationInfo(); 9096 } 9097 } 9098 9099 /** 9100 * Recomputes the transform matrix if necessary. 9101 */ 9102 private void updateMatrix() { 9103 final TransformationInfo info = mTransformationInfo; 9104 if (info == null) { 9105 return; 9106 } 9107 if (info.mMatrixDirty) { 9108 // transform-related properties have changed since the last time someone 9109 // asked for the matrix; recalculate it with the current values 9110 9111 // Figure out if we need to update the pivot point 9112 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9113 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 9114 info.mPrevWidth = mRight - mLeft; 9115 info.mPrevHeight = mBottom - mTop; 9116 info.mPivotX = info.mPrevWidth / 2f; 9117 info.mPivotY = info.mPrevHeight / 2f; 9118 } 9119 } 9120 info.mMatrix.reset(); 9121 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 9122 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 9123 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 9124 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 9125 } else { 9126 if (info.mCamera == null) { 9127 info.mCamera = new Camera(); 9128 info.matrix3D = new Matrix(); 9129 } 9130 info.mCamera.save(); 9131 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 9132 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 9133 info.mCamera.getMatrix(info.matrix3D); 9134 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 9135 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 9136 info.mPivotY + info.mTranslationY); 9137 info.mMatrix.postConcat(info.matrix3D); 9138 info.mCamera.restore(); 9139 } 9140 info.mMatrixDirty = false; 9141 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 9142 info.mInverseMatrixDirty = true; 9143 } 9144 } 9145 9146 /** 9147 * Utility method to retrieve the inverse of the current mMatrix property. 9148 * We cache the matrix to avoid recalculating it when transform properties 9149 * have not changed. 9150 * 9151 * @return The inverse of the current matrix of this view. 9152 */ 9153 final Matrix getInverseMatrix() { 9154 final TransformationInfo info = mTransformationInfo; 9155 if (info != null) { 9156 updateMatrix(); 9157 if (info.mInverseMatrixDirty) { 9158 if (info.mInverseMatrix == null) { 9159 info.mInverseMatrix = new Matrix(); 9160 } 9161 info.mMatrix.invert(info.mInverseMatrix); 9162 info.mInverseMatrixDirty = false; 9163 } 9164 return info.mInverseMatrix; 9165 } 9166 return Matrix.IDENTITY_MATRIX; 9167 } 9168 9169 /** 9170 * Gets the distance along the Z axis from the camera to this view. 9171 * 9172 * @see #setCameraDistance(float) 9173 * 9174 * @return The distance along the Z axis. 9175 */ 9176 public float getCameraDistance() { 9177 ensureTransformationInfo(); 9178 final float dpi = mResources.getDisplayMetrics().densityDpi; 9179 final TransformationInfo info = mTransformationInfo; 9180 if (info.mCamera == null) { 9181 info.mCamera = new Camera(); 9182 info.matrix3D = new Matrix(); 9183 } 9184 return -(info.mCamera.getLocationZ() * dpi); 9185 } 9186 9187 /** 9188 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 9189 * views are drawn) from the camera to this view. The camera's distance 9190 * affects 3D transformations, for instance rotations around the X and Y 9191 * axis. If the rotationX or rotationY properties are changed and this view is 9192 * large (more than half the size of the screen), it is recommended to always 9193 * use a camera distance that's greater than the height (X axis rotation) or 9194 * the width (Y axis rotation) of this view.</p> 9195 * 9196 * <p>The distance of the camera from the view plane can have an affect on the 9197 * perspective distortion of the view when it is rotated around the x or y axis. 9198 * For example, a large distance will result in a large viewing angle, and there 9199 * will not be much perspective distortion of the view as it rotates. A short 9200 * distance may cause much more perspective distortion upon rotation, and can 9201 * also result in some drawing artifacts if the rotated view ends up partially 9202 * behind the camera (which is why the recommendation is to use a distance at 9203 * least as far as the size of the view, if the view is to be rotated.)</p> 9204 * 9205 * <p>The distance is expressed in "depth pixels." The default distance depends 9206 * on the screen density. For instance, on a medium density display, the 9207 * default distance is 1280. On a high density display, the default distance 9208 * is 1920.</p> 9209 * 9210 * <p>If you want to specify a distance that leads to visually consistent 9211 * results across various densities, use the following formula:</p> 9212 * <pre> 9213 * float scale = context.getResources().getDisplayMetrics().density; 9214 * view.setCameraDistance(distance * scale); 9215 * </pre> 9216 * 9217 * <p>The density scale factor of a high density display is 1.5, 9218 * and 1920 = 1280 * 1.5.</p> 9219 * 9220 * @param distance The distance in "depth pixels", if negative the opposite 9221 * value is used 9222 * 9223 * @see #setRotationX(float) 9224 * @see #setRotationY(float) 9225 */ 9226 public void setCameraDistance(float distance) { 9227 invalidateViewProperty(true, false); 9228 9229 ensureTransformationInfo(); 9230 final float dpi = mResources.getDisplayMetrics().densityDpi; 9231 final TransformationInfo info = mTransformationInfo; 9232 if (info.mCamera == null) { 9233 info.mCamera = new Camera(); 9234 info.matrix3D = new Matrix(); 9235 } 9236 9237 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 9238 info.mMatrixDirty = true; 9239 9240 invalidateViewProperty(false, false); 9241 if (mDisplayList != null) { 9242 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 9243 } 9244 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9245 // View was rejected last time it was drawn by its parent; this may have changed 9246 invalidateParentIfNeeded(); 9247 } 9248 } 9249 9250 /** 9251 * The degrees that the view is rotated around the pivot point. 9252 * 9253 * @see #setRotation(float) 9254 * @see #getPivotX() 9255 * @see #getPivotY() 9256 * 9257 * @return The degrees of rotation. 9258 */ 9259 @ViewDebug.ExportedProperty(category = "drawing") 9260 public float getRotation() { 9261 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 9262 } 9263 9264 /** 9265 * Sets the degrees that the view is rotated around the pivot point. Increasing values 9266 * result in clockwise rotation. 9267 * 9268 * @param rotation The degrees of rotation. 9269 * 9270 * @see #getRotation() 9271 * @see #getPivotX() 9272 * @see #getPivotY() 9273 * @see #setRotationX(float) 9274 * @see #setRotationY(float) 9275 * 9276 * @attr ref android.R.styleable#View_rotation 9277 */ 9278 public void setRotation(float rotation) { 9279 ensureTransformationInfo(); 9280 final TransformationInfo info = mTransformationInfo; 9281 if (info.mRotation != rotation) { 9282 // Double-invalidation is necessary to capture view's old and new areas 9283 invalidateViewProperty(true, false); 9284 info.mRotation = rotation; 9285 info.mMatrixDirty = true; 9286 invalidateViewProperty(false, true); 9287 if (mDisplayList != null) { 9288 mDisplayList.setRotation(rotation); 9289 } 9290 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9291 // View was rejected last time it was drawn by its parent; this may have changed 9292 invalidateParentIfNeeded(); 9293 } 9294 } 9295 } 9296 9297 /** 9298 * The degrees that the view is rotated around the vertical axis through the pivot point. 9299 * 9300 * @see #getPivotX() 9301 * @see #getPivotY() 9302 * @see #setRotationY(float) 9303 * 9304 * @return The degrees of Y rotation. 9305 */ 9306 @ViewDebug.ExportedProperty(category = "drawing") 9307 public float getRotationY() { 9308 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 9309 } 9310 9311 /** 9312 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 9313 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 9314 * down the y axis. 9315 * 9316 * When rotating large views, it is recommended to adjust the camera distance 9317 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9318 * 9319 * @param rotationY The degrees of Y rotation. 9320 * 9321 * @see #getRotationY() 9322 * @see #getPivotX() 9323 * @see #getPivotY() 9324 * @see #setRotation(float) 9325 * @see #setRotationX(float) 9326 * @see #setCameraDistance(float) 9327 * 9328 * @attr ref android.R.styleable#View_rotationY 9329 */ 9330 public void setRotationY(float rotationY) { 9331 ensureTransformationInfo(); 9332 final TransformationInfo info = mTransformationInfo; 9333 if (info.mRotationY != rotationY) { 9334 invalidateViewProperty(true, false); 9335 info.mRotationY = rotationY; 9336 info.mMatrixDirty = true; 9337 invalidateViewProperty(false, true); 9338 if (mDisplayList != null) { 9339 mDisplayList.setRotationY(rotationY); 9340 } 9341 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9342 // View was rejected last time it was drawn by its parent; this may have changed 9343 invalidateParentIfNeeded(); 9344 } 9345 } 9346 } 9347 9348 /** 9349 * The degrees that the view is rotated around the horizontal axis through the pivot point. 9350 * 9351 * @see #getPivotX() 9352 * @see #getPivotY() 9353 * @see #setRotationX(float) 9354 * 9355 * @return The degrees of X rotation. 9356 */ 9357 @ViewDebug.ExportedProperty(category = "drawing") 9358 public float getRotationX() { 9359 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 9360 } 9361 9362 /** 9363 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 9364 * Increasing values result in clockwise rotation from the viewpoint of looking down the 9365 * x axis. 9366 * 9367 * When rotating large views, it is recommended to adjust the camera distance 9368 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9369 * 9370 * @param rotationX The degrees of X rotation. 9371 * 9372 * @see #getRotationX() 9373 * @see #getPivotX() 9374 * @see #getPivotY() 9375 * @see #setRotation(float) 9376 * @see #setRotationY(float) 9377 * @see #setCameraDistance(float) 9378 * 9379 * @attr ref android.R.styleable#View_rotationX 9380 */ 9381 public void setRotationX(float rotationX) { 9382 ensureTransformationInfo(); 9383 final TransformationInfo info = mTransformationInfo; 9384 if (info.mRotationX != rotationX) { 9385 invalidateViewProperty(true, false); 9386 info.mRotationX = rotationX; 9387 info.mMatrixDirty = true; 9388 invalidateViewProperty(false, true); 9389 if (mDisplayList != null) { 9390 mDisplayList.setRotationX(rotationX); 9391 } 9392 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9393 // View was rejected last time it was drawn by its parent; this may have changed 9394 invalidateParentIfNeeded(); 9395 } 9396 } 9397 } 9398 9399 /** 9400 * The amount that the view is scaled in x around the pivot point, as a proportion of 9401 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 9402 * 9403 * <p>By default, this is 1.0f. 9404 * 9405 * @see #getPivotX() 9406 * @see #getPivotY() 9407 * @return The scaling factor. 9408 */ 9409 @ViewDebug.ExportedProperty(category = "drawing") 9410 public float getScaleX() { 9411 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 9412 } 9413 9414 /** 9415 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 9416 * the view's unscaled width. A value of 1 means that no scaling is applied. 9417 * 9418 * @param scaleX The scaling factor. 9419 * @see #getPivotX() 9420 * @see #getPivotY() 9421 * 9422 * @attr ref android.R.styleable#View_scaleX 9423 */ 9424 public void setScaleX(float scaleX) { 9425 ensureTransformationInfo(); 9426 final TransformationInfo info = mTransformationInfo; 9427 if (info.mScaleX != scaleX) { 9428 invalidateViewProperty(true, false); 9429 info.mScaleX = scaleX; 9430 info.mMatrixDirty = true; 9431 invalidateViewProperty(false, true); 9432 if (mDisplayList != null) { 9433 mDisplayList.setScaleX(scaleX); 9434 } 9435 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9436 // View was rejected last time it was drawn by its parent; this may have changed 9437 invalidateParentIfNeeded(); 9438 } 9439 } 9440 } 9441 9442 /** 9443 * The amount that the view is scaled in y around the pivot point, as a proportion of 9444 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 9445 * 9446 * <p>By default, this is 1.0f. 9447 * 9448 * @see #getPivotX() 9449 * @see #getPivotY() 9450 * @return The scaling factor. 9451 */ 9452 @ViewDebug.ExportedProperty(category = "drawing") 9453 public float getScaleY() { 9454 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 9455 } 9456 9457 /** 9458 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 9459 * the view's unscaled width. A value of 1 means that no scaling is applied. 9460 * 9461 * @param scaleY The scaling factor. 9462 * @see #getPivotX() 9463 * @see #getPivotY() 9464 * 9465 * @attr ref android.R.styleable#View_scaleY 9466 */ 9467 public void setScaleY(float scaleY) { 9468 ensureTransformationInfo(); 9469 final TransformationInfo info = mTransformationInfo; 9470 if (info.mScaleY != scaleY) { 9471 invalidateViewProperty(true, false); 9472 info.mScaleY = scaleY; 9473 info.mMatrixDirty = true; 9474 invalidateViewProperty(false, true); 9475 if (mDisplayList != null) { 9476 mDisplayList.setScaleY(scaleY); 9477 } 9478 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9479 // View was rejected last time it was drawn by its parent; this may have changed 9480 invalidateParentIfNeeded(); 9481 } 9482 } 9483 } 9484 9485 /** 9486 * The x location of the point around which the view is {@link #setRotation(float) rotated} 9487 * and {@link #setScaleX(float) scaled}. 9488 * 9489 * @see #getRotation() 9490 * @see #getScaleX() 9491 * @see #getScaleY() 9492 * @see #getPivotY() 9493 * @return The x location of the pivot point. 9494 * 9495 * @attr ref android.R.styleable#View_transformPivotX 9496 */ 9497 @ViewDebug.ExportedProperty(category = "drawing") 9498 public float getPivotX() { 9499 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 9500 } 9501 9502 /** 9503 * Sets the x location of the point around which the view is 9504 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 9505 * By default, the pivot point is centered on the object. 9506 * Setting this property disables this behavior and causes the view to use only the 9507 * explicitly set pivotX and pivotY values. 9508 * 9509 * @param pivotX The x location of the pivot point. 9510 * @see #getRotation() 9511 * @see #getScaleX() 9512 * @see #getScaleY() 9513 * @see #getPivotY() 9514 * 9515 * @attr ref android.R.styleable#View_transformPivotX 9516 */ 9517 public void setPivotX(float pivotX) { 9518 ensureTransformationInfo(); 9519 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9520 final TransformationInfo info = mTransformationInfo; 9521 if (info.mPivotX != pivotX) { 9522 invalidateViewProperty(true, false); 9523 info.mPivotX = pivotX; 9524 info.mMatrixDirty = true; 9525 invalidateViewProperty(false, true); 9526 if (mDisplayList != null) { 9527 mDisplayList.setPivotX(pivotX); 9528 } 9529 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9530 // View was rejected last time it was drawn by its parent; this may have changed 9531 invalidateParentIfNeeded(); 9532 } 9533 } 9534 } 9535 9536 /** 9537 * The y location of the point around which the view is {@link #setRotation(float) rotated} 9538 * and {@link #setScaleY(float) scaled}. 9539 * 9540 * @see #getRotation() 9541 * @see #getScaleX() 9542 * @see #getScaleY() 9543 * @see #getPivotY() 9544 * @return The y location of the pivot point. 9545 * 9546 * @attr ref android.R.styleable#View_transformPivotY 9547 */ 9548 @ViewDebug.ExportedProperty(category = "drawing") 9549 public float getPivotY() { 9550 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 9551 } 9552 9553 /** 9554 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 9555 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 9556 * Setting this property disables this behavior and causes the view to use only the 9557 * explicitly set pivotX and pivotY values. 9558 * 9559 * @param pivotY The y location of the pivot point. 9560 * @see #getRotation() 9561 * @see #getScaleX() 9562 * @see #getScaleY() 9563 * @see #getPivotY() 9564 * 9565 * @attr ref android.R.styleable#View_transformPivotY 9566 */ 9567 public void setPivotY(float pivotY) { 9568 ensureTransformationInfo(); 9569 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9570 final TransformationInfo info = mTransformationInfo; 9571 if (info.mPivotY != pivotY) { 9572 invalidateViewProperty(true, false); 9573 info.mPivotY = pivotY; 9574 info.mMatrixDirty = true; 9575 invalidateViewProperty(false, true); 9576 if (mDisplayList != null) { 9577 mDisplayList.setPivotY(pivotY); 9578 } 9579 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9580 // View was rejected last time it was drawn by its parent; this may have changed 9581 invalidateParentIfNeeded(); 9582 } 9583 } 9584 } 9585 9586 /** 9587 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 9588 * completely transparent and 1 means the view is completely opaque. 9589 * 9590 * <p>By default this is 1.0f. 9591 * @return The opacity of the view. 9592 */ 9593 @ViewDebug.ExportedProperty(category = "drawing") 9594 public float getAlpha() { 9595 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 9596 } 9597 9598 /** 9599 * Returns whether this View has content which overlaps. This function, intended to be 9600 * overridden by specific View types, is an optimization when alpha is set on a view. If 9601 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 9602 * and then composited it into place, which can be expensive. If the view has no overlapping 9603 * rendering, the view can draw each primitive with the appropriate alpha value directly. 9604 * An example of overlapping rendering is a TextView with a background image, such as a 9605 * Button. An example of non-overlapping rendering is a TextView with no background, or 9606 * an ImageView with only the foreground image. The default implementation returns true; 9607 * subclasses should override if they have cases which can be optimized. 9608 * 9609 * @return true if the content in this view might overlap, false otherwise. 9610 */ 9611 public boolean hasOverlappingRendering() { 9612 return true; 9613 } 9614 9615 /** 9616 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 9617 * completely transparent and 1 means the view is completely opaque.</p> 9618 * 9619 * <p> Note that setting alpha to a translucent value (0 < alpha < 1) can have significant 9620 * performance implications, especially for large views. It is best to use the alpha property 9621 * sparingly and transiently, as in the case of fading animations.</p> 9622 * 9623 * <p>For a view with a frequently changing alpha, such as during a fading animation, it is 9624 * strongly recommended for performance reasons to either override 9625 * {@link #hasOverlappingRendering()} to return false if appropriate, or setting a 9626 * {@link #setLayerType(int, android.graphics.Paint) layer type} on the view.</p> 9627 * 9628 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 9629 * responsible for applying the opacity itself.</p> 9630 * 9631 * <p>Note that if the view is backed by a 9632 * {@link #setLayerType(int, android.graphics.Paint) layer} and is associated with a 9633 * {@link #setLayerPaint(android.graphics.Paint) layer paint}, setting an alpha value less than 9634 * 1.0 will supercede the alpha of the layer paint.</p> 9635 * 9636 * @param alpha The opacity of the view. 9637 * 9638 * @see #hasOverlappingRendering() 9639 * @see #setLayerType(int, android.graphics.Paint) 9640 * 9641 * @attr ref android.R.styleable#View_alpha 9642 */ 9643 public void setAlpha(float alpha) { 9644 ensureTransformationInfo(); 9645 if (mTransformationInfo.mAlpha != alpha) { 9646 mTransformationInfo.mAlpha = alpha; 9647 if (onSetAlpha((int) (alpha * 255))) { 9648 mPrivateFlags |= PFLAG_ALPHA_SET; 9649 // subclass is handling alpha - don't optimize rendering cache invalidation 9650 invalidateParentCaches(); 9651 invalidate(true); 9652 } else { 9653 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9654 invalidateViewProperty(true, false); 9655 if (mDisplayList != null) { 9656 mDisplayList.setAlpha(alpha); 9657 } 9658 } 9659 } 9660 } 9661 9662 /** 9663 * Faster version of setAlpha() which performs the same steps except there are 9664 * no calls to invalidate(). The caller of this function should perform proper invalidation 9665 * on the parent and this object. The return value indicates whether the subclass handles 9666 * alpha (the return value for onSetAlpha()). 9667 * 9668 * @param alpha The new value for the alpha property 9669 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9670 * the new value for the alpha property is different from the old value 9671 */ 9672 boolean setAlphaNoInvalidation(float alpha) { 9673 ensureTransformationInfo(); 9674 if (mTransformationInfo.mAlpha != alpha) { 9675 mTransformationInfo.mAlpha = alpha; 9676 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9677 if (subclassHandlesAlpha) { 9678 mPrivateFlags |= PFLAG_ALPHA_SET; 9679 return true; 9680 } else { 9681 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9682 if (mDisplayList != null) { 9683 mDisplayList.setAlpha(alpha); 9684 } 9685 } 9686 } 9687 return false; 9688 } 9689 9690 /** 9691 * Top position of this view relative to its parent. 9692 * 9693 * @return The top of this view, in pixels. 9694 */ 9695 @ViewDebug.CapturedViewProperty 9696 public final int getTop() { 9697 return mTop; 9698 } 9699 9700 /** 9701 * Sets the top position of this view relative to its parent. This method is meant to be called 9702 * by the layout system and should not generally be called otherwise, because the property 9703 * may be changed at any time by the layout. 9704 * 9705 * @param top The top of this view, in pixels. 9706 */ 9707 public final void setTop(int top) { 9708 if (top != mTop) { 9709 updateMatrix(); 9710 final boolean matrixIsIdentity = mTransformationInfo == null 9711 || mTransformationInfo.mMatrixIsIdentity; 9712 if (matrixIsIdentity) { 9713 if (mAttachInfo != null) { 9714 int minTop; 9715 int yLoc; 9716 if (top < mTop) { 9717 minTop = top; 9718 yLoc = top - mTop; 9719 } else { 9720 minTop = mTop; 9721 yLoc = 0; 9722 } 9723 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9724 } 9725 } else { 9726 // Double-invalidation is necessary to capture view's old and new areas 9727 invalidate(true); 9728 } 9729 9730 int width = mRight - mLeft; 9731 int oldHeight = mBottom - mTop; 9732 9733 mTop = top; 9734 if (mDisplayList != null) { 9735 mDisplayList.setTop(mTop); 9736 } 9737 9738 sizeChange(width, mBottom - mTop, width, oldHeight); 9739 9740 if (!matrixIsIdentity) { 9741 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9742 // A change in dimension means an auto-centered pivot point changes, too 9743 mTransformationInfo.mMatrixDirty = true; 9744 } 9745 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9746 invalidate(true); 9747 } 9748 mBackgroundSizeChanged = true; 9749 invalidateParentIfNeeded(); 9750 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9751 // View was rejected last time it was drawn by its parent; this may have changed 9752 invalidateParentIfNeeded(); 9753 } 9754 } 9755 } 9756 9757 /** 9758 * Bottom position of this view relative to its parent. 9759 * 9760 * @return The bottom of this view, in pixels. 9761 */ 9762 @ViewDebug.CapturedViewProperty 9763 public final int getBottom() { 9764 return mBottom; 9765 } 9766 9767 /** 9768 * True if this view has changed since the last time being drawn. 9769 * 9770 * @return The dirty state of this view. 9771 */ 9772 public boolean isDirty() { 9773 return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0; 9774 } 9775 9776 /** 9777 * Sets the bottom position of this view relative to its parent. This method is meant to be 9778 * called by the layout system and should not generally be called otherwise, because the 9779 * property may be changed at any time by the layout. 9780 * 9781 * @param bottom The bottom of this view, in pixels. 9782 */ 9783 public final void setBottom(int bottom) { 9784 if (bottom != mBottom) { 9785 updateMatrix(); 9786 final boolean matrixIsIdentity = mTransformationInfo == null 9787 || mTransformationInfo.mMatrixIsIdentity; 9788 if (matrixIsIdentity) { 9789 if (mAttachInfo != null) { 9790 int maxBottom; 9791 if (bottom < mBottom) { 9792 maxBottom = mBottom; 9793 } else { 9794 maxBottom = bottom; 9795 } 9796 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9797 } 9798 } else { 9799 // Double-invalidation is necessary to capture view's old and new areas 9800 invalidate(true); 9801 } 9802 9803 int width = mRight - mLeft; 9804 int oldHeight = mBottom - mTop; 9805 9806 mBottom = bottom; 9807 if (mDisplayList != null) { 9808 mDisplayList.setBottom(mBottom); 9809 } 9810 9811 sizeChange(width, mBottom - mTop, width, oldHeight); 9812 9813 if (!matrixIsIdentity) { 9814 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9815 // A change in dimension means an auto-centered pivot point changes, too 9816 mTransformationInfo.mMatrixDirty = true; 9817 } 9818 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9819 invalidate(true); 9820 } 9821 mBackgroundSizeChanged = true; 9822 invalidateParentIfNeeded(); 9823 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9824 // View was rejected last time it was drawn by its parent; this may have changed 9825 invalidateParentIfNeeded(); 9826 } 9827 } 9828 } 9829 9830 /** 9831 * Left position of this view relative to its parent. 9832 * 9833 * @return The left edge of this view, in pixels. 9834 */ 9835 @ViewDebug.CapturedViewProperty 9836 public final int getLeft() { 9837 return mLeft; 9838 } 9839 9840 /** 9841 * Sets the left position of this view relative to its parent. This method is meant to be called 9842 * by the layout system and should not generally be called otherwise, because the property 9843 * may be changed at any time by the layout. 9844 * 9845 * @param left The bottom of this view, in pixels. 9846 */ 9847 public final void setLeft(int left) { 9848 if (left != mLeft) { 9849 updateMatrix(); 9850 final boolean matrixIsIdentity = mTransformationInfo == null 9851 || mTransformationInfo.mMatrixIsIdentity; 9852 if (matrixIsIdentity) { 9853 if (mAttachInfo != null) { 9854 int minLeft; 9855 int xLoc; 9856 if (left < mLeft) { 9857 minLeft = left; 9858 xLoc = left - mLeft; 9859 } else { 9860 minLeft = mLeft; 9861 xLoc = 0; 9862 } 9863 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9864 } 9865 } else { 9866 // Double-invalidation is necessary to capture view's old and new areas 9867 invalidate(true); 9868 } 9869 9870 int oldWidth = mRight - mLeft; 9871 int height = mBottom - mTop; 9872 9873 mLeft = left; 9874 if (mDisplayList != null) { 9875 mDisplayList.setLeft(left); 9876 } 9877 9878 sizeChange(mRight - mLeft, height, oldWidth, height); 9879 9880 if (!matrixIsIdentity) { 9881 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9882 // A change in dimension means an auto-centered pivot point changes, too 9883 mTransformationInfo.mMatrixDirty = true; 9884 } 9885 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9886 invalidate(true); 9887 } 9888 mBackgroundSizeChanged = true; 9889 invalidateParentIfNeeded(); 9890 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9891 // View was rejected last time it was drawn by its parent; this may have changed 9892 invalidateParentIfNeeded(); 9893 } 9894 } 9895 } 9896 9897 /** 9898 * Right position of this view relative to its parent. 9899 * 9900 * @return The right edge of this view, in pixels. 9901 */ 9902 @ViewDebug.CapturedViewProperty 9903 public final int getRight() { 9904 return mRight; 9905 } 9906 9907 /** 9908 * Sets the right position of this view relative to its parent. This method is meant to be called 9909 * by the layout system and should not generally be called otherwise, because the property 9910 * may be changed at any time by the layout. 9911 * 9912 * @param right The bottom of this view, in pixels. 9913 */ 9914 public final void setRight(int right) { 9915 if (right != mRight) { 9916 updateMatrix(); 9917 final boolean matrixIsIdentity = mTransformationInfo == null 9918 || mTransformationInfo.mMatrixIsIdentity; 9919 if (matrixIsIdentity) { 9920 if (mAttachInfo != null) { 9921 int maxRight; 9922 if (right < mRight) { 9923 maxRight = mRight; 9924 } else { 9925 maxRight = right; 9926 } 9927 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9928 } 9929 } else { 9930 // Double-invalidation is necessary to capture view's old and new areas 9931 invalidate(true); 9932 } 9933 9934 int oldWidth = mRight - mLeft; 9935 int height = mBottom - mTop; 9936 9937 mRight = right; 9938 if (mDisplayList != null) { 9939 mDisplayList.setRight(mRight); 9940 } 9941 9942 sizeChange(mRight - mLeft, height, oldWidth, height); 9943 9944 if (!matrixIsIdentity) { 9945 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9946 // A change in dimension means an auto-centered pivot point changes, too 9947 mTransformationInfo.mMatrixDirty = true; 9948 } 9949 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9950 invalidate(true); 9951 } 9952 mBackgroundSizeChanged = true; 9953 invalidateParentIfNeeded(); 9954 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9955 // View was rejected last time it was drawn by its parent; this may have changed 9956 invalidateParentIfNeeded(); 9957 } 9958 } 9959 } 9960 9961 /** 9962 * The visual x position of this view, in pixels. This is equivalent to the 9963 * {@link #setTranslationX(float) translationX} property plus the current 9964 * {@link #getLeft() left} property. 9965 * 9966 * @return The visual x position of this view, in pixels. 9967 */ 9968 @ViewDebug.ExportedProperty(category = "drawing") 9969 public float getX() { 9970 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9971 } 9972 9973 /** 9974 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9975 * {@link #setTranslationX(float) translationX} property to be the difference between 9976 * the x value passed in and the current {@link #getLeft() left} property. 9977 * 9978 * @param x The visual x position of this view, in pixels. 9979 */ 9980 public void setX(float x) { 9981 setTranslationX(x - mLeft); 9982 } 9983 9984 /** 9985 * The visual y position of this view, in pixels. This is equivalent to the 9986 * {@link #setTranslationY(float) translationY} property plus the current 9987 * {@link #getTop() top} property. 9988 * 9989 * @return The visual y position of this view, in pixels. 9990 */ 9991 @ViewDebug.ExportedProperty(category = "drawing") 9992 public float getY() { 9993 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9994 } 9995 9996 /** 9997 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9998 * {@link #setTranslationY(float) translationY} property to be the difference between 9999 * the y value passed in and the current {@link #getTop() top} property. 10000 * 10001 * @param y The visual y position of this view, in pixels. 10002 */ 10003 public void setY(float y) { 10004 setTranslationY(y - mTop); 10005 } 10006 10007 10008 /** 10009 * The horizontal location of this view relative to its {@link #getLeft() left} position. 10010 * This position is post-layout, in addition to wherever the object's 10011 * layout placed it. 10012 * 10013 * @return The horizontal position of this view relative to its left position, in pixels. 10014 */ 10015 @ViewDebug.ExportedProperty(category = "drawing") 10016 public float getTranslationX() { 10017 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 10018 } 10019 10020 /** 10021 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 10022 * This effectively positions the object post-layout, in addition to wherever the object's 10023 * layout placed it. 10024 * 10025 * @param translationX The horizontal position of this view relative to its left position, 10026 * in pixels. 10027 * 10028 * @attr ref android.R.styleable#View_translationX 10029 */ 10030 public void setTranslationX(float translationX) { 10031 ensureTransformationInfo(); 10032 final TransformationInfo info = mTransformationInfo; 10033 if (info.mTranslationX != translationX) { 10034 // Double-invalidation is necessary to capture view's old and new areas 10035 invalidateViewProperty(true, false); 10036 info.mTranslationX = translationX; 10037 info.mMatrixDirty = true; 10038 invalidateViewProperty(false, true); 10039 if (mDisplayList != null) { 10040 mDisplayList.setTranslationX(translationX); 10041 } 10042 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10043 // View was rejected last time it was drawn by its parent; this may have changed 10044 invalidateParentIfNeeded(); 10045 } 10046 } 10047 } 10048 10049 /** 10050 * The horizontal location of this view relative to its {@link #getTop() top} position. 10051 * This position is post-layout, in addition to wherever the object's 10052 * layout placed it. 10053 * 10054 * @return The vertical position of this view relative to its top position, 10055 * in pixels. 10056 */ 10057 @ViewDebug.ExportedProperty(category = "drawing") 10058 public float getTranslationY() { 10059 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 10060 } 10061 10062 /** 10063 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 10064 * This effectively positions the object post-layout, in addition to wherever the object's 10065 * layout placed it. 10066 * 10067 * @param translationY The vertical position of this view relative to its top position, 10068 * in pixels. 10069 * 10070 * @attr ref android.R.styleable#View_translationY 10071 */ 10072 public void setTranslationY(float translationY) { 10073 ensureTransformationInfo(); 10074 final TransformationInfo info = mTransformationInfo; 10075 if (info.mTranslationY != translationY) { 10076 invalidateViewProperty(true, false); 10077 info.mTranslationY = translationY; 10078 info.mMatrixDirty = true; 10079 invalidateViewProperty(false, true); 10080 if (mDisplayList != null) { 10081 mDisplayList.setTranslationY(translationY); 10082 } 10083 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10084 // View was rejected last time it was drawn by its parent; this may have changed 10085 invalidateParentIfNeeded(); 10086 } 10087 } 10088 } 10089 10090 /** 10091 * Hit rectangle in parent's coordinates 10092 * 10093 * @param outRect The hit rectangle of the view. 10094 */ 10095 public void getHitRect(Rect outRect) { 10096 updateMatrix(); 10097 final TransformationInfo info = mTransformationInfo; 10098 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 10099 outRect.set(mLeft, mTop, mRight, mBottom); 10100 } else { 10101 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 10102 tmpRect.set(0, 0, getWidth(), getHeight()); 10103 info.mMatrix.mapRect(tmpRect); 10104 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 10105 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 10106 } 10107 } 10108 10109 /** 10110 * Determines whether the given point, in local coordinates is inside the view. 10111 */ 10112 /*package*/ final boolean pointInView(float localX, float localY) { 10113 return localX >= 0 && localX < (mRight - mLeft) 10114 && localY >= 0 && localY < (mBottom - mTop); 10115 } 10116 10117 /** 10118 * Utility method to determine whether the given point, in local coordinates, 10119 * is inside the view, where the area of the view is expanded by the slop factor. 10120 * This method is called while processing touch-move events to determine if the event 10121 * is still within the view. 10122 * 10123 * @hide 10124 */ 10125 public boolean pointInView(float localX, float localY, float slop) { 10126 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 10127 localY < ((mBottom - mTop) + slop); 10128 } 10129 10130 /** 10131 * When a view has focus and the user navigates away from it, the next view is searched for 10132 * starting from the rectangle filled in by this method. 10133 * 10134 * By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)}) 10135 * of the view. However, if your view maintains some idea of internal selection, 10136 * such as a cursor, or a selected row or column, you should override this method and 10137 * fill in a more specific rectangle. 10138 * 10139 * @param r The rectangle to fill in, in this view's coordinates. 10140 */ 10141 public void getFocusedRect(Rect r) { 10142 getDrawingRect(r); 10143 } 10144 10145 /** 10146 * If some part of this view is not clipped by any of its parents, then 10147 * return that area in r in global (root) coordinates. To convert r to local 10148 * coordinates (without taking possible View rotations into account), offset 10149 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 10150 * If the view is completely clipped or translated out, return false. 10151 * 10152 * @param r If true is returned, r holds the global coordinates of the 10153 * visible portion of this view. 10154 * @param globalOffset If true is returned, globalOffset holds the dx,dy 10155 * between this view and its root. globalOffet may be null. 10156 * @return true if r is non-empty (i.e. part of the view is visible at the 10157 * root level. 10158 */ 10159 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 10160 int width = mRight - mLeft; 10161 int height = mBottom - mTop; 10162 if (width > 0 && height > 0) { 10163 r.set(0, 0, width, height); 10164 if (globalOffset != null) { 10165 globalOffset.set(-mScrollX, -mScrollY); 10166 } 10167 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 10168 } 10169 return false; 10170 } 10171 10172 public final boolean getGlobalVisibleRect(Rect r) { 10173 return getGlobalVisibleRect(r, null); 10174 } 10175 10176 public final boolean getLocalVisibleRect(Rect r) { 10177 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 10178 if (getGlobalVisibleRect(r, offset)) { 10179 r.offset(-offset.x, -offset.y); // make r local 10180 return true; 10181 } 10182 return false; 10183 } 10184 10185 /** 10186 * Offset this view's vertical location by the specified number of pixels. 10187 * 10188 * @param offset the number of pixels to offset the view by 10189 */ 10190 public void offsetTopAndBottom(int offset) { 10191 if (offset != 0) { 10192 updateMatrix(); 10193 final boolean matrixIsIdentity = mTransformationInfo == null 10194 || mTransformationInfo.mMatrixIsIdentity; 10195 if (matrixIsIdentity) { 10196 if (mDisplayList != null) { 10197 invalidateViewProperty(false, false); 10198 } else { 10199 final ViewParent p = mParent; 10200 if (p != null && mAttachInfo != null) { 10201 final Rect r = mAttachInfo.mTmpInvalRect; 10202 int minTop; 10203 int maxBottom; 10204 int yLoc; 10205 if (offset < 0) { 10206 minTop = mTop + offset; 10207 maxBottom = mBottom; 10208 yLoc = offset; 10209 } else { 10210 minTop = mTop; 10211 maxBottom = mBottom + offset; 10212 yLoc = 0; 10213 } 10214 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 10215 p.invalidateChild(this, r); 10216 } 10217 } 10218 } else { 10219 invalidateViewProperty(false, false); 10220 } 10221 10222 mTop += offset; 10223 mBottom += offset; 10224 if (mDisplayList != null) { 10225 mDisplayList.offsetTopAndBottom(offset); 10226 invalidateViewProperty(false, false); 10227 } else { 10228 if (!matrixIsIdentity) { 10229 invalidateViewProperty(false, true); 10230 } 10231 invalidateParentIfNeeded(); 10232 } 10233 } 10234 } 10235 10236 /** 10237 * Offset this view's horizontal location by the specified amount of pixels. 10238 * 10239 * @param offset the number of pixels to offset the view by 10240 */ 10241 public void offsetLeftAndRight(int offset) { 10242 if (offset != 0) { 10243 updateMatrix(); 10244 final boolean matrixIsIdentity = mTransformationInfo == null 10245 || mTransformationInfo.mMatrixIsIdentity; 10246 if (matrixIsIdentity) { 10247 if (mDisplayList != null) { 10248 invalidateViewProperty(false, false); 10249 } else { 10250 final ViewParent p = mParent; 10251 if (p != null && mAttachInfo != null) { 10252 final Rect r = mAttachInfo.mTmpInvalRect; 10253 int minLeft; 10254 int maxRight; 10255 if (offset < 0) { 10256 minLeft = mLeft + offset; 10257 maxRight = mRight; 10258 } else { 10259 minLeft = mLeft; 10260 maxRight = mRight + offset; 10261 } 10262 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 10263 p.invalidateChild(this, r); 10264 } 10265 } 10266 } else { 10267 invalidateViewProperty(false, false); 10268 } 10269 10270 mLeft += offset; 10271 mRight += offset; 10272 if (mDisplayList != null) { 10273 mDisplayList.offsetLeftAndRight(offset); 10274 invalidateViewProperty(false, false); 10275 } else { 10276 if (!matrixIsIdentity) { 10277 invalidateViewProperty(false, true); 10278 } 10279 invalidateParentIfNeeded(); 10280 } 10281 } 10282 } 10283 10284 /** 10285 * Get the LayoutParams associated with this view. All views should have 10286 * layout parameters. These supply parameters to the <i>parent</i> of this 10287 * view specifying how it should be arranged. There are many subclasses of 10288 * ViewGroup.LayoutParams, and these correspond to the different subclasses 10289 * of ViewGroup that are responsible for arranging their children. 10290 * 10291 * This method may return null if this View is not attached to a parent 10292 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 10293 * was not invoked successfully. When a View is attached to a parent 10294 * ViewGroup, this method must not return null. 10295 * 10296 * @return The LayoutParams associated with this view, or null if no 10297 * parameters have been set yet 10298 */ 10299 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 10300 public ViewGroup.LayoutParams getLayoutParams() { 10301 return mLayoutParams; 10302 } 10303 10304 /** 10305 * Set the layout parameters associated with this view. These supply 10306 * parameters to the <i>parent</i> of this view specifying how it should be 10307 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 10308 * correspond to the different subclasses of ViewGroup that are responsible 10309 * for arranging their children. 10310 * 10311 * @param params The layout parameters for this view, cannot be null 10312 */ 10313 public void setLayoutParams(ViewGroup.LayoutParams params) { 10314 if (params == null) { 10315 throw new NullPointerException("Layout parameters cannot be null"); 10316 } 10317 mLayoutParams = params; 10318 resolveLayoutParams(); 10319 if (mParent instanceof ViewGroup) { 10320 ((ViewGroup) mParent).onSetLayoutParams(this, params); 10321 } 10322 requestLayout(); 10323 } 10324 10325 /** 10326 * Resolve the layout parameters depending on the resolved layout direction 10327 * 10328 * @hide 10329 */ 10330 public void resolveLayoutParams() { 10331 if (mLayoutParams != null) { 10332 mLayoutParams.resolveLayoutDirection(getLayoutDirection()); 10333 } 10334 } 10335 10336 /** 10337 * Set the scrolled position of your view. This will cause a call to 10338 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10339 * invalidated. 10340 * @param x the x position to scroll to 10341 * @param y the y position to scroll to 10342 */ 10343 public void scrollTo(int x, int y) { 10344 if (mScrollX != x || mScrollY != y) { 10345 int oldX = mScrollX; 10346 int oldY = mScrollY; 10347 mScrollX = x; 10348 mScrollY = y; 10349 invalidateParentCaches(); 10350 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 10351 if (!awakenScrollBars()) { 10352 postInvalidateOnAnimation(); 10353 } 10354 } 10355 } 10356 10357 /** 10358 * Move the scrolled position of your view. This will cause a call to 10359 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10360 * invalidated. 10361 * @param x the amount of pixels to scroll by horizontally 10362 * @param y the amount of pixels to scroll by vertically 10363 */ 10364 public void scrollBy(int x, int y) { 10365 scrollTo(mScrollX + x, mScrollY + y); 10366 } 10367 10368 /** 10369 * <p>Trigger the scrollbars to draw. When invoked this method starts an 10370 * animation to fade the scrollbars out after a default delay. If a subclass 10371 * provides animated scrolling, the start delay should equal the duration 10372 * of the scrolling animation.</p> 10373 * 10374 * <p>The animation starts only if at least one of the scrollbars is 10375 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 10376 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10377 * this method returns true, and false otherwise. If the animation is 10378 * started, this method calls {@link #invalidate()}; in that case the 10379 * caller should not call {@link #invalidate()}.</p> 10380 * 10381 * <p>This method should be invoked every time a subclass directly updates 10382 * the scroll parameters.</p> 10383 * 10384 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 10385 * and {@link #scrollTo(int, int)}.</p> 10386 * 10387 * @return true if the animation is played, false otherwise 10388 * 10389 * @see #awakenScrollBars(int) 10390 * @see #scrollBy(int, int) 10391 * @see #scrollTo(int, int) 10392 * @see #isHorizontalScrollBarEnabled() 10393 * @see #isVerticalScrollBarEnabled() 10394 * @see #setHorizontalScrollBarEnabled(boolean) 10395 * @see #setVerticalScrollBarEnabled(boolean) 10396 */ 10397 protected boolean awakenScrollBars() { 10398 return mScrollCache != null && 10399 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 10400 } 10401 10402 /** 10403 * Trigger the scrollbars to draw. 10404 * This method differs from awakenScrollBars() only in its default duration. 10405 * initialAwakenScrollBars() will show the scroll bars for longer than 10406 * usual to give the user more of a chance to notice them. 10407 * 10408 * @return true if the animation is played, false otherwise. 10409 */ 10410 private boolean initialAwakenScrollBars() { 10411 return mScrollCache != null && 10412 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 10413 } 10414 10415 /** 10416 * <p> 10417 * Trigger the scrollbars to draw. When invoked this method starts an 10418 * animation to fade the scrollbars out after a fixed delay. If a subclass 10419 * provides animated scrolling, the start delay should equal the duration of 10420 * the scrolling animation. 10421 * </p> 10422 * 10423 * <p> 10424 * The animation starts only if at least one of the scrollbars is enabled, 10425 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10426 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10427 * this method returns true, and false otherwise. If the animation is 10428 * started, this method calls {@link #invalidate()}; in that case the caller 10429 * should not call {@link #invalidate()}. 10430 * </p> 10431 * 10432 * <p> 10433 * This method should be invoked everytime a subclass directly updates the 10434 * scroll parameters. 10435 * </p> 10436 * 10437 * @param startDelay the delay, in milliseconds, after which the animation 10438 * should start; when the delay is 0, the animation starts 10439 * immediately 10440 * @return true if the animation is played, false otherwise 10441 * 10442 * @see #scrollBy(int, int) 10443 * @see #scrollTo(int, int) 10444 * @see #isHorizontalScrollBarEnabled() 10445 * @see #isVerticalScrollBarEnabled() 10446 * @see #setHorizontalScrollBarEnabled(boolean) 10447 * @see #setVerticalScrollBarEnabled(boolean) 10448 */ 10449 protected boolean awakenScrollBars(int startDelay) { 10450 return awakenScrollBars(startDelay, true); 10451 } 10452 10453 /** 10454 * <p> 10455 * Trigger the scrollbars to draw. When invoked this method starts an 10456 * animation to fade the scrollbars out after a fixed delay. If a subclass 10457 * provides animated scrolling, the start delay should equal the duration of 10458 * the scrolling animation. 10459 * </p> 10460 * 10461 * <p> 10462 * The animation starts only if at least one of the scrollbars is enabled, 10463 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10464 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10465 * this method returns true, and false otherwise. If the animation is 10466 * started, this method calls {@link #invalidate()} if the invalidate parameter 10467 * is set to true; in that case the caller 10468 * should not call {@link #invalidate()}. 10469 * </p> 10470 * 10471 * <p> 10472 * This method should be invoked everytime a subclass directly updates the 10473 * scroll parameters. 10474 * </p> 10475 * 10476 * @param startDelay the delay, in milliseconds, after which the animation 10477 * should start; when the delay is 0, the animation starts 10478 * immediately 10479 * 10480 * @param invalidate Wheter this method should call invalidate 10481 * 10482 * @return true if the animation is played, false otherwise 10483 * 10484 * @see #scrollBy(int, int) 10485 * @see #scrollTo(int, int) 10486 * @see #isHorizontalScrollBarEnabled() 10487 * @see #isVerticalScrollBarEnabled() 10488 * @see #setHorizontalScrollBarEnabled(boolean) 10489 * @see #setVerticalScrollBarEnabled(boolean) 10490 */ 10491 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 10492 final ScrollabilityCache scrollCache = mScrollCache; 10493 10494 if (scrollCache == null || !scrollCache.fadeScrollBars) { 10495 return false; 10496 } 10497 10498 if (scrollCache.scrollBar == null) { 10499 scrollCache.scrollBar = new ScrollBarDrawable(); 10500 } 10501 10502 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 10503 10504 if (invalidate) { 10505 // Invalidate to show the scrollbars 10506 postInvalidateOnAnimation(); 10507 } 10508 10509 if (scrollCache.state == ScrollabilityCache.OFF) { 10510 // FIXME: this is copied from WindowManagerService. 10511 // We should get this value from the system when it 10512 // is possible to do so. 10513 final int KEY_REPEAT_FIRST_DELAY = 750; 10514 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 10515 } 10516 10517 // Tell mScrollCache when we should start fading. This may 10518 // extend the fade start time if one was already scheduled 10519 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 10520 scrollCache.fadeStartTime = fadeStartTime; 10521 scrollCache.state = ScrollabilityCache.ON; 10522 10523 // Schedule our fader to run, unscheduling any old ones first 10524 if (mAttachInfo != null) { 10525 mAttachInfo.mHandler.removeCallbacks(scrollCache); 10526 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 10527 } 10528 10529 return true; 10530 } 10531 10532 return false; 10533 } 10534 10535 /** 10536 * Do not invalidate views which are not visible and which are not running an animation. They 10537 * will not get drawn and they should not set dirty flags as if they will be drawn 10538 */ 10539 private boolean skipInvalidate() { 10540 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 10541 (!(mParent instanceof ViewGroup) || 10542 !((ViewGroup) mParent).isViewTransitioning(this)); 10543 } 10544 /** 10545 * Mark the area defined by dirty as needing to be drawn. If the view is 10546 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 10547 * in the future. This must be called from a UI thread. To call from a non-UI 10548 * thread, call {@link #postInvalidate()}. 10549 * 10550 * WARNING: This method is destructive to dirty. 10551 * @param dirty the rectangle representing the bounds of the dirty region 10552 */ 10553 public void invalidate(Rect dirty) { 10554 if (skipInvalidate()) { 10555 return; 10556 } 10557 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10558 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10559 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10560 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10561 mPrivateFlags |= PFLAG_INVALIDATED; 10562 mPrivateFlags |= PFLAG_DIRTY; 10563 final ViewParent p = mParent; 10564 final AttachInfo ai = mAttachInfo; 10565 //noinspection PointlessBooleanExpression,ConstantConditions 10566 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10567 if (p != null && ai != null && ai.mHardwareAccelerated) { 10568 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10569 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10570 p.invalidateChild(this, null); 10571 return; 10572 } 10573 } 10574 if (p != null && ai != null) { 10575 final int scrollX = mScrollX; 10576 final int scrollY = mScrollY; 10577 final Rect r = ai.mTmpInvalRect; 10578 r.set(dirty.left - scrollX, dirty.top - scrollY, 10579 dirty.right - scrollX, dirty.bottom - scrollY); 10580 mParent.invalidateChild(this, r); 10581 } 10582 } 10583 } 10584 10585 /** 10586 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 10587 * The coordinates of the dirty rect are relative to the view. 10588 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 10589 * will be called at some point in the future. This must be called from 10590 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 10591 * @param l the left position of the dirty region 10592 * @param t the top position of the dirty region 10593 * @param r the right position of the dirty region 10594 * @param b the bottom position of the dirty region 10595 */ 10596 public void invalidate(int l, int t, int r, int b) { 10597 if (skipInvalidate()) { 10598 return; 10599 } 10600 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10601 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10602 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10603 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10604 mPrivateFlags |= PFLAG_INVALIDATED; 10605 mPrivateFlags |= PFLAG_DIRTY; 10606 final ViewParent p = mParent; 10607 final AttachInfo ai = mAttachInfo; 10608 //noinspection PointlessBooleanExpression,ConstantConditions 10609 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10610 if (p != null && ai != null && ai.mHardwareAccelerated) { 10611 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10612 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10613 p.invalidateChild(this, null); 10614 return; 10615 } 10616 } 10617 if (p != null && ai != null && l < r && t < b) { 10618 final int scrollX = mScrollX; 10619 final int scrollY = mScrollY; 10620 final Rect tmpr = ai.mTmpInvalRect; 10621 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 10622 p.invalidateChild(this, tmpr); 10623 } 10624 } 10625 } 10626 10627 /** 10628 * Invalidate the whole view. If the view is visible, 10629 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 10630 * the future. This must be called from a UI thread. To call from a non-UI thread, 10631 * call {@link #postInvalidate()}. 10632 */ 10633 public void invalidate() { 10634 invalidate(true); 10635 } 10636 10637 /** 10638 * This is where the invalidate() work actually happens. A full invalidate() 10639 * causes the drawing cache to be invalidated, but this function can be called with 10640 * invalidateCache set to false to skip that invalidation step for cases that do not 10641 * need it (for example, a component that remains at the same dimensions with the same 10642 * content). 10643 * 10644 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 10645 * well. This is usually true for a full invalidate, but may be set to false if the 10646 * View's contents or dimensions have not changed. 10647 */ 10648 void invalidate(boolean invalidateCache) { 10649 if (skipInvalidate()) { 10650 return; 10651 } 10652 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10653 (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) || 10654 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED || isOpaque() != mLastIsOpaque) { 10655 mLastIsOpaque = isOpaque(); 10656 mPrivateFlags &= ~PFLAG_DRAWN; 10657 mPrivateFlags |= PFLAG_DIRTY; 10658 if (invalidateCache) { 10659 mPrivateFlags |= PFLAG_INVALIDATED; 10660 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10661 } 10662 final AttachInfo ai = mAttachInfo; 10663 final ViewParent p = mParent; 10664 //noinspection PointlessBooleanExpression,ConstantConditions 10665 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10666 if (p != null && ai != null && ai.mHardwareAccelerated) { 10667 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10668 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10669 p.invalidateChild(this, null); 10670 return; 10671 } 10672 } 10673 10674 if (p != null && ai != null) { 10675 final Rect r = ai.mTmpInvalRect; 10676 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10677 // Don't call invalidate -- we don't want to internally scroll 10678 // our own bounds 10679 p.invalidateChild(this, r); 10680 } 10681 } 10682 } 10683 10684 /** 10685 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10686 * set any flags or handle all of the cases handled by the default invalidation methods. 10687 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10688 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10689 * walk up the hierarchy, transforming the dirty rect as necessary. 10690 * 10691 * The method also handles normal invalidation logic if display list properties are not 10692 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10693 * backup approach, to handle these cases used in the various property-setting methods. 10694 * 10695 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10696 * are not being used in this view 10697 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10698 * list properties are not being used in this view 10699 */ 10700 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10701 if (mDisplayList == null || (mPrivateFlags & PFLAG_DRAW_ANIMATION) == PFLAG_DRAW_ANIMATION) { 10702 if (invalidateParent) { 10703 invalidateParentCaches(); 10704 } 10705 if (forceRedraw) { 10706 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10707 } 10708 invalidate(false); 10709 } else { 10710 final AttachInfo ai = mAttachInfo; 10711 final ViewParent p = mParent; 10712 if (p != null && ai != null) { 10713 final Rect r = ai.mTmpInvalRect; 10714 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10715 if (mParent instanceof ViewGroup) { 10716 ((ViewGroup) mParent).invalidateChildFast(this, r); 10717 } else { 10718 mParent.invalidateChild(this, r); 10719 } 10720 } 10721 } 10722 } 10723 10724 /** 10725 * Utility method to transform a given Rect by the current matrix of this view. 10726 */ 10727 void transformRect(final Rect rect) { 10728 if (!getMatrix().isIdentity()) { 10729 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10730 boundingRect.set(rect); 10731 getMatrix().mapRect(boundingRect); 10732 rect.set((int) Math.floor(boundingRect.left), 10733 (int) Math.floor(boundingRect.top), 10734 (int) Math.ceil(boundingRect.right), 10735 (int) Math.ceil(boundingRect.bottom)); 10736 } 10737 } 10738 10739 /** 10740 * Used to indicate that the parent of this view should clear its caches. This functionality 10741 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10742 * which is necessary when various parent-managed properties of the view change, such as 10743 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10744 * clears the parent caches and does not causes an invalidate event. 10745 * 10746 * @hide 10747 */ 10748 protected void invalidateParentCaches() { 10749 if (mParent instanceof View) { 10750 ((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED; 10751 } 10752 } 10753 10754 /** 10755 * Used to indicate that the parent of this view should be invalidated. This functionality 10756 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10757 * which is necessary when various parent-managed properties of the view change, such as 10758 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10759 * an invalidation event to the parent. 10760 * 10761 * @hide 10762 */ 10763 protected void invalidateParentIfNeeded() { 10764 if (isHardwareAccelerated() && mParent instanceof View) { 10765 ((View) mParent).invalidate(true); 10766 } 10767 } 10768 10769 /** 10770 * Indicates whether this View is opaque. An opaque View guarantees that it will 10771 * draw all the pixels overlapping its bounds using a fully opaque color. 10772 * 10773 * Subclasses of View should override this method whenever possible to indicate 10774 * whether an instance is opaque. Opaque Views are treated in a special way by 10775 * the View hierarchy, possibly allowing it to perform optimizations during 10776 * invalidate/draw passes. 10777 * 10778 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10779 */ 10780 @ViewDebug.ExportedProperty(category = "drawing") 10781 public boolean isOpaque() { 10782 return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK && 10783 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1.0f) >= 1.0f); 10784 } 10785 10786 /** 10787 * @hide 10788 */ 10789 protected void computeOpaqueFlags() { 10790 // Opaque if: 10791 // - Has a background 10792 // - Background is opaque 10793 // - Doesn't have scrollbars or scrollbars overlay 10794 10795 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10796 mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND; 10797 } else { 10798 mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND; 10799 } 10800 10801 final int flags = mViewFlags; 10802 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10803 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY || 10804 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_OUTSIDE_OVERLAY) { 10805 mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS; 10806 } else { 10807 mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS; 10808 } 10809 } 10810 10811 /** 10812 * @hide 10813 */ 10814 protected boolean hasOpaqueScrollbars() { 10815 return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS; 10816 } 10817 10818 /** 10819 * @return A handler associated with the thread running the View. This 10820 * handler can be used to pump events in the UI events queue. 10821 */ 10822 public Handler getHandler() { 10823 final AttachInfo attachInfo = mAttachInfo; 10824 if (attachInfo != null) { 10825 return attachInfo.mHandler; 10826 } 10827 return null; 10828 } 10829 10830 /** 10831 * Gets the view root associated with the View. 10832 * @return The view root, or null if none. 10833 * @hide 10834 */ 10835 public ViewRootImpl getViewRootImpl() { 10836 if (mAttachInfo != null) { 10837 return mAttachInfo.mViewRootImpl; 10838 } 10839 return null; 10840 } 10841 10842 /** 10843 * <p>Causes the Runnable to be added to the message queue. 10844 * The runnable will be run on the user interface thread.</p> 10845 * 10846 * @param action The Runnable that will be executed. 10847 * 10848 * @return Returns true if the Runnable was successfully placed in to the 10849 * message queue. Returns false on failure, usually because the 10850 * looper processing the message queue is exiting. 10851 * 10852 * @see #postDelayed 10853 * @see #removeCallbacks 10854 */ 10855 public boolean post(Runnable action) { 10856 final AttachInfo attachInfo = mAttachInfo; 10857 if (attachInfo != null) { 10858 return attachInfo.mHandler.post(action); 10859 } 10860 // Assume that post will succeed later 10861 ViewRootImpl.getRunQueue().post(action); 10862 return true; 10863 } 10864 10865 /** 10866 * <p>Causes the Runnable to be added to the message queue, to be run 10867 * after the specified amount of time elapses. 10868 * The runnable will be run on the user interface thread.</p> 10869 * 10870 * @param action The Runnable that will be executed. 10871 * @param delayMillis The delay (in milliseconds) until the Runnable 10872 * will be executed. 10873 * 10874 * @return true if the Runnable was successfully placed in to the 10875 * message queue. Returns false on failure, usually because the 10876 * looper processing the message queue is exiting. Note that a 10877 * result of true does not mean the Runnable will be processed -- 10878 * if the looper is quit before the delivery time of the message 10879 * occurs then the message will be dropped. 10880 * 10881 * @see #post 10882 * @see #removeCallbacks 10883 */ 10884 public boolean postDelayed(Runnable action, long delayMillis) { 10885 final AttachInfo attachInfo = mAttachInfo; 10886 if (attachInfo != null) { 10887 return attachInfo.mHandler.postDelayed(action, delayMillis); 10888 } 10889 // Assume that post will succeed later 10890 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10891 return true; 10892 } 10893 10894 /** 10895 * <p>Causes the Runnable to execute on the next animation time step. 10896 * The runnable will be run on the user interface thread.</p> 10897 * 10898 * @param action The Runnable that will be executed. 10899 * 10900 * @see #postOnAnimationDelayed 10901 * @see #removeCallbacks 10902 */ 10903 public void postOnAnimation(Runnable action) { 10904 final AttachInfo attachInfo = mAttachInfo; 10905 if (attachInfo != null) { 10906 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10907 Choreographer.CALLBACK_ANIMATION, action, null); 10908 } else { 10909 // Assume that post will succeed later 10910 ViewRootImpl.getRunQueue().post(action); 10911 } 10912 } 10913 10914 /** 10915 * <p>Causes the Runnable to execute on the next animation time step, 10916 * after the specified amount of time elapses. 10917 * The runnable will be run on the user interface thread.</p> 10918 * 10919 * @param action The Runnable that will be executed. 10920 * @param delayMillis The delay (in milliseconds) until the Runnable 10921 * will be executed. 10922 * 10923 * @see #postOnAnimation 10924 * @see #removeCallbacks 10925 */ 10926 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10927 final AttachInfo attachInfo = mAttachInfo; 10928 if (attachInfo != null) { 10929 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10930 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10931 } else { 10932 // Assume that post will succeed later 10933 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10934 } 10935 } 10936 10937 /** 10938 * <p>Removes the specified Runnable from the message queue.</p> 10939 * 10940 * @param action The Runnable to remove from the message handling queue 10941 * 10942 * @return true if this view could ask the Handler to remove the Runnable, 10943 * false otherwise. When the returned value is true, the Runnable 10944 * may or may not have been actually removed from the message queue 10945 * (for instance, if the Runnable was not in the queue already.) 10946 * 10947 * @see #post 10948 * @see #postDelayed 10949 * @see #postOnAnimation 10950 * @see #postOnAnimationDelayed 10951 */ 10952 public boolean removeCallbacks(Runnable action) { 10953 if (action != null) { 10954 final AttachInfo attachInfo = mAttachInfo; 10955 if (attachInfo != null) { 10956 attachInfo.mHandler.removeCallbacks(action); 10957 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10958 Choreographer.CALLBACK_ANIMATION, action, null); 10959 } else { 10960 // Assume that post will succeed later 10961 ViewRootImpl.getRunQueue().removeCallbacks(action); 10962 } 10963 } 10964 return true; 10965 } 10966 10967 /** 10968 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10969 * Use this to invalidate the View from a non-UI thread.</p> 10970 * 10971 * <p>This method can be invoked from outside of the UI thread 10972 * only when this View is attached to a window.</p> 10973 * 10974 * @see #invalidate() 10975 * @see #postInvalidateDelayed(long) 10976 */ 10977 public void postInvalidate() { 10978 postInvalidateDelayed(0); 10979 } 10980 10981 /** 10982 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10983 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10984 * 10985 * <p>This method can be invoked from outside of the UI thread 10986 * only when this View is attached to a window.</p> 10987 * 10988 * @param left The left coordinate of the rectangle to invalidate. 10989 * @param top The top coordinate of the rectangle to invalidate. 10990 * @param right The right coordinate of the rectangle to invalidate. 10991 * @param bottom The bottom coordinate of the rectangle to invalidate. 10992 * 10993 * @see #invalidate(int, int, int, int) 10994 * @see #invalidate(Rect) 10995 * @see #postInvalidateDelayed(long, int, int, int, int) 10996 */ 10997 public void postInvalidate(int left, int top, int right, int bottom) { 10998 postInvalidateDelayed(0, left, top, right, bottom); 10999 } 11000 11001 /** 11002 * <p>Cause an invalidate to happen on a subsequent cycle through the event 11003 * loop. Waits for the specified amount of time.</p> 11004 * 11005 * <p>This method can be invoked from outside of the UI thread 11006 * only when this View is attached to a window.</p> 11007 * 11008 * @param delayMilliseconds the duration in milliseconds to delay the 11009 * invalidation by 11010 * 11011 * @see #invalidate() 11012 * @see #postInvalidate() 11013 */ 11014 public void postInvalidateDelayed(long delayMilliseconds) { 11015 // We try only with the AttachInfo because there's no point in invalidating 11016 // if we are not attached to our window 11017 final AttachInfo attachInfo = mAttachInfo; 11018 if (attachInfo != null) { 11019 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 11020 } 11021 } 11022 11023 /** 11024 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 11025 * through the event loop. Waits for the specified amount of time.</p> 11026 * 11027 * <p>This method can be invoked from outside of the UI thread 11028 * only when this View is attached to a window.</p> 11029 * 11030 * @param delayMilliseconds the duration in milliseconds to delay the 11031 * invalidation by 11032 * @param left The left coordinate of the rectangle to invalidate. 11033 * @param top The top coordinate of the rectangle to invalidate. 11034 * @param right The right coordinate of the rectangle to invalidate. 11035 * @param bottom The bottom coordinate of the rectangle to invalidate. 11036 * 11037 * @see #invalidate(int, int, int, int) 11038 * @see #invalidate(Rect) 11039 * @see #postInvalidate(int, int, int, int) 11040 */ 11041 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 11042 int right, int bottom) { 11043 11044 // We try only with the AttachInfo because there's no point in invalidating 11045 // if we are not attached to our window 11046 final AttachInfo attachInfo = mAttachInfo; 11047 if (attachInfo != null) { 11048 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 11049 info.target = this; 11050 info.left = left; 11051 info.top = top; 11052 info.right = right; 11053 info.bottom = bottom; 11054 11055 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 11056 } 11057 } 11058 11059 /** 11060 * <p>Cause an invalidate to happen on the next animation time step, typically the 11061 * next display frame.</p> 11062 * 11063 * <p>This method can be invoked from outside of the UI thread 11064 * only when this View is attached to a window.</p> 11065 * 11066 * @see #invalidate() 11067 */ 11068 public void postInvalidateOnAnimation() { 11069 // We try only with the AttachInfo because there's no point in invalidating 11070 // if we are not attached to our window 11071 final AttachInfo attachInfo = mAttachInfo; 11072 if (attachInfo != null) { 11073 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 11074 } 11075 } 11076 11077 /** 11078 * <p>Cause an invalidate of the specified area to happen on the next animation 11079 * time step, typically the next display frame.</p> 11080 * 11081 * <p>This method can be invoked from outside of the UI thread 11082 * only when this View is attached to a window.</p> 11083 * 11084 * @param left The left coordinate of the rectangle to invalidate. 11085 * @param top The top coordinate of the rectangle to invalidate. 11086 * @param right The right coordinate of the rectangle to invalidate. 11087 * @param bottom The bottom coordinate of the rectangle to invalidate. 11088 * 11089 * @see #invalidate(int, int, int, int) 11090 * @see #invalidate(Rect) 11091 */ 11092 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 11093 // We try only with the AttachInfo because there's no point in invalidating 11094 // if we are not attached to our window 11095 final AttachInfo attachInfo = mAttachInfo; 11096 if (attachInfo != null) { 11097 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 11098 info.target = this; 11099 info.left = left; 11100 info.top = top; 11101 info.right = right; 11102 info.bottom = bottom; 11103 11104 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 11105 } 11106 } 11107 11108 /** 11109 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 11110 * This event is sent at most once every 11111 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 11112 */ 11113 private void postSendViewScrolledAccessibilityEventCallback() { 11114 if (mSendViewScrolledAccessibilityEvent == null) { 11115 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 11116 } 11117 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 11118 mSendViewScrolledAccessibilityEvent.mIsPending = true; 11119 postDelayed(mSendViewScrolledAccessibilityEvent, 11120 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 11121 } 11122 } 11123 11124 /** 11125 * Called by a parent to request that a child update its values for mScrollX 11126 * and mScrollY if necessary. This will typically be done if the child is 11127 * animating a scroll using a {@link android.widget.Scroller Scroller} 11128 * object. 11129 */ 11130 public void computeScroll() { 11131 } 11132 11133 /** 11134 * <p>Indicate whether the horizontal edges are faded when the view is 11135 * scrolled horizontally.</p> 11136 * 11137 * @return true if the horizontal edges should are faded on scroll, false 11138 * otherwise 11139 * 11140 * @see #setHorizontalFadingEdgeEnabled(boolean) 11141 * 11142 * @attr ref android.R.styleable#View_requiresFadingEdge 11143 */ 11144 public boolean isHorizontalFadingEdgeEnabled() { 11145 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 11146 } 11147 11148 /** 11149 * <p>Define whether the horizontal edges should be faded when this view 11150 * is scrolled horizontally.</p> 11151 * 11152 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 11153 * be faded when the view is scrolled 11154 * horizontally 11155 * 11156 * @see #isHorizontalFadingEdgeEnabled() 11157 * 11158 * @attr ref android.R.styleable#View_requiresFadingEdge 11159 */ 11160 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 11161 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 11162 if (horizontalFadingEdgeEnabled) { 11163 initScrollCache(); 11164 } 11165 11166 mViewFlags ^= FADING_EDGE_HORIZONTAL; 11167 } 11168 } 11169 11170 /** 11171 * <p>Indicate whether the vertical edges are faded when the view is 11172 * scrolled horizontally.</p> 11173 * 11174 * @return true if the vertical edges should are faded on scroll, false 11175 * otherwise 11176 * 11177 * @see #setVerticalFadingEdgeEnabled(boolean) 11178 * 11179 * @attr ref android.R.styleable#View_requiresFadingEdge 11180 */ 11181 public boolean isVerticalFadingEdgeEnabled() { 11182 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 11183 } 11184 11185 /** 11186 * <p>Define whether the vertical edges should be faded when this view 11187 * is scrolled vertically.</p> 11188 * 11189 * @param verticalFadingEdgeEnabled true if the vertical edges should 11190 * be faded when the view is scrolled 11191 * vertically 11192 * 11193 * @see #isVerticalFadingEdgeEnabled() 11194 * 11195 * @attr ref android.R.styleable#View_requiresFadingEdge 11196 */ 11197 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 11198 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 11199 if (verticalFadingEdgeEnabled) { 11200 initScrollCache(); 11201 } 11202 11203 mViewFlags ^= FADING_EDGE_VERTICAL; 11204 } 11205 } 11206 11207 /** 11208 * Returns the strength, or intensity, of the top faded edge. The strength is 11209 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11210 * returns 0.0 or 1.0 but no value in between. 11211 * 11212 * Subclasses should override this method to provide a smoother fade transition 11213 * when scrolling occurs. 11214 * 11215 * @return the intensity of the top fade as a float between 0.0f and 1.0f 11216 */ 11217 protected float getTopFadingEdgeStrength() { 11218 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 11219 } 11220 11221 /** 11222 * Returns the strength, or intensity, of the bottom faded edge. The strength is 11223 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11224 * returns 0.0 or 1.0 but no value in between. 11225 * 11226 * Subclasses should override this method to provide a smoother fade transition 11227 * when scrolling occurs. 11228 * 11229 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 11230 */ 11231 protected float getBottomFadingEdgeStrength() { 11232 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 11233 computeVerticalScrollRange() ? 1.0f : 0.0f; 11234 } 11235 11236 /** 11237 * Returns the strength, or intensity, of the left faded edge. The strength is 11238 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11239 * returns 0.0 or 1.0 but no value in between. 11240 * 11241 * Subclasses should override this method to provide a smoother fade transition 11242 * when scrolling occurs. 11243 * 11244 * @return the intensity of the left fade as a float between 0.0f and 1.0f 11245 */ 11246 protected float getLeftFadingEdgeStrength() { 11247 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 11248 } 11249 11250 /** 11251 * Returns the strength, or intensity, of the right faded edge. The strength is 11252 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11253 * returns 0.0 or 1.0 but no value in between. 11254 * 11255 * Subclasses should override this method to provide a smoother fade transition 11256 * when scrolling occurs. 11257 * 11258 * @return the intensity of the right fade as a float between 0.0f and 1.0f 11259 */ 11260 protected float getRightFadingEdgeStrength() { 11261 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 11262 computeHorizontalScrollRange() ? 1.0f : 0.0f; 11263 } 11264 11265 /** 11266 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 11267 * scrollbar is not drawn by default.</p> 11268 * 11269 * @return true if the horizontal scrollbar should be painted, false 11270 * otherwise 11271 * 11272 * @see #setHorizontalScrollBarEnabled(boolean) 11273 */ 11274 public boolean isHorizontalScrollBarEnabled() { 11275 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11276 } 11277 11278 /** 11279 * <p>Define whether the horizontal scrollbar should be drawn or not. The 11280 * scrollbar is not drawn by default.</p> 11281 * 11282 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 11283 * be painted 11284 * 11285 * @see #isHorizontalScrollBarEnabled() 11286 */ 11287 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 11288 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 11289 mViewFlags ^= SCROLLBARS_HORIZONTAL; 11290 computeOpaqueFlags(); 11291 resolvePadding(); 11292 } 11293 } 11294 11295 /** 11296 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 11297 * scrollbar is not drawn by default.</p> 11298 * 11299 * @return true if the vertical scrollbar should be painted, false 11300 * otherwise 11301 * 11302 * @see #setVerticalScrollBarEnabled(boolean) 11303 */ 11304 public boolean isVerticalScrollBarEnabled() { 11305 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 11306 } 11307 11308 /** 11309 * <p>Define whether the vertical scrollbar should be drawn or not. The 11310 * scrollbar is not drawn by default.</p> 11311 * 11312 * @param verticalScrollBarEnabled true if the vertical scrollbar should 11313 * be painted 11314 * 11315 * @see #isVerticalScrollBarEnabled() 11316 */ 11317 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 11318 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 11319 mViewFlags ^= SCROLLBARS_VERTICAL; 11320 computeOpaqueFlags(); 11321 resolvePadding(); 11322 } 11323 } 11324 11325 /** 11326 * @hide 11327 */ 11328 protected void recomputePadding() { 11329 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 11330 } 11331 11332 /** 11333 * Define whether scrollbars will fade when the view is not scrolling. 11334 * 11335 * @param fadeScrollbars wheter to enable fading 11336 * 11337 * @attr ref android.R.styleable#View_fadeScrollbars 11338 */ 11339 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 11340 initScrollCache(); 11341 final ScrollabilityCache scrollabilityCache = mScrollCache; 11342 scrollabilityCache.fadeScrollBars = fadeScrollbars; 11343 if (fadeScrollbars) { 11344 scrollabilityCache.state = ScrollabilityCache.OFF; 11345 } else { 11346 scrollabilityCache.state = ScrollabilityCache.ON; 11347 } 11348 } 11349 11350 /** 11351 * 11352 * Returns true if scrollbars will fade when this view is not scrolling 11353 * 11354 * @return true if scrollbar fading is enabled 11355 * 11356 * @attr ref android.R.styleable#View_fadeScrollbars 11357 */ 11358 public boolean isScrollbarFadingEnabled() { 11359 return mScrollCache != null && mScrollCache.fadeScrollBars; 11360 } 11361 11362 /** 11363 * 11364 * Returns the delay before scrollbars fade. 11365 * 11366 * @return the delay before scrollbars fade 11367 * 11368 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11369 */ 11370 public int getScrollBarDefaultDelayBeforeFade() { 11371 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 11372 mScrollCache.scrollBarDefaultDelayBeforeFade; 11373 } 11374 11375 /** 11376 * Define the delay before scrollbars fade. 11377 * 11378 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 11379 * 11380 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11381 */ 11382 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 11383 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 11384 } 11385 11386 /** 11387 * 11388 * Returns the scrollbar fade duration. 11389 * 11390 * @return the scrollbar fade duration 11391 * 11392 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11393 */ 11394 public int getScrollBarFadeDuration() { 11395 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 11396 mScrollCache.scrollBarFadeDuration; 11397 } 11398 11399 /** 11400 * Define the scrollbar fade duration. 11401 * 11402 * @param scrollBarFadeDuration - the scrollbar fade duration 11403 * 11404 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11405 */ 11406 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 11407 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 11408 } 11409 11410 /** 11411 * 11412 * Returns the scrollbar size. 11413 * 11414 * @return the scrollbar size 11415 * 11416 * @attr ref android.R.styleable#View_scrollbarSize 11417 */ 11418 public int getScrollBarSize() { 11419 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 11420 mScrollCache.scrollBarSize; 11421 } 11422 11423 /** 11424 * Define the scrollbar size. 11425 * 11426 * @param scrollBarSize - the scrollbar size 11427 * 11428 * @attr ref android.R.styleable#View_scrollbarSize 11429 */ 11430 public void setScrollBarSize(int scrollBarSize) { 11431 getScrollCache().scrollBarSize = scrollBarSize; 11432 } 11433 11434 /** 11435 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 11436 * inset. When inset, they add to the padding of the view. And the scrollbars 11437 * can be drawn inside the padding area or on the edge of the view. For example, 11438 * if a view has a background drawable and you want to draw the scrollbars 11439 * inside the padding specified by the drawable, you can use 11440 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 11441 * appear at the edge of the view, ignoring the padding, then you can use 11442 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 11443 * @param style the style of the scrollbars. Should be one of 11444 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 11445 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 11446 * @see #SCROLLBARS_INSIDE_OVERLAY 11447 * @see #SCROLLBARS_INSIDE_INSET 11448 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11449 * @see #SCROLLBARS_OUTSIDE_INSET 11450 * 11451 * @attr ref android.R.styleable#View_scrollbarStyle 11452 */ 11453 public void setScrollBarStyle(int style) { 11454 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 11455 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 11456 computeOpaqueFlags(); 11457 resolvePadding(); 11458 } 11459 } 11460 11461 /** 11462 * <p>Returns the current scrollbar style.</p> 11463 * @return the current scrollbar style 11464 * @see #SCROLLBARS_INSIDE_OVERLAY 11465 * @see #SCROLLBARS_INSIDE_INSET 11466 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11467 * @see #SCROLLBARS_OUTSIDE_INSET 11468 * 11469 * @attr ref android.R.styleable#View_scrollbarStyle 11470 */ 11471 @ViewDebug.ExportedProperty(mapping = { 11472 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 11473 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 11474 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 11475 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 11476 }) 11477 public int getScrollBarStyle() { 11478 return mViewFlags & SCROLLBARS_STYLE_MASK; 11479 } 11480 11481 /** 11482 * <p>Compute the horizontal range that the horizontal scrollbar 11483 * represents.</p> 11484 * 11485 * <p>The range is expressed in arbitrary units that must be the same as the 11486 * units used by {@link #computeHorizontalScrollExtent()} and 11487 * {@link #computeHorizontalScrollOffset()}.</p> 11488 * 11489 * <p>The default range is the drawing width of this view.</p> 11490 * 11491 * @return the total horizontal range represented by the horizontal 11492 * scrollbar 11493 * 11494 * @see #computeHorizontalScrollExtent() 11495 * @see #computeHorizontalScrollOffset() 11496 * @see android.widget.ScrollBarDrawable 11497 */ 11498 protected int computeHorizontalScrollRange() { 11499 return getWidth(); 11500 } 11501 11502 /** 11503 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 11504 * within the horizontal range. This value is used to compute the position 11505 * of the thumb within the scrollbar's track.</p> 11506 * 11507 * <p>The range is expressed in arbitrary units that must be the same as the 11508 * units used by {@link #computeHorizontalScrollRange()} and 11509 * {@link #computeHorizontalScrollExtent()}.</p> 11510 * 11511 * <p>The default offset is the scroll offset of this view.</p> 11512 * 11513 * @return the horizontal offset of the scrollbar's thumb 11514 * 11515 * @see #computeHorizontalScrollRange() 11516 * @see #computeHorizontalScrollExtent() 11517 * @see android.widget.ScrollBarDrawable 11518 */ 11519 protected int computeHorizontalScrollOffset() { 11520 return mScrollX; 11521 } 11522 11523 /** 11524 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 11525 * within the horizontal range. This value is used to compute the length 11526 * of the thumb within the scrollbar's track.</p> 11527 * 11528 * <p>The range is expressed in arbitrary units that must be the same as the 11529 * units used by {@link #computeHorizontalScrollRange()} and 11530 * {@link #computeHorizontalScrollOffset()}.</p> 11531 * 11532 * <p>The default extent is the drawing width of this view.</p> 11533 * 11534 * @return the horizontal extent of the scrollbar's thumb 11535 * 11536 * @see #computeHorizontalScrollRange() 11537 * @see #computeHorizontalScrollOffset() 11538 * @see android.widget.ScrollBarDrawable 11539 */ 11540 protected int computeHorizontalScrollExtent() { 11541 return getWidth(); 11542 } 11543 11544 /** 11545 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 11546 * 11547 * <p>The range is expressed in arbitrary units that must be the same as the 11548 * units used by {@link #computeVerticalScrollExtent()} and 11549 * {@link #computeVerticalScrollOffset()}.</p> 11550 * 11551 * @return the total vertical range represented by the vertical scrollbar 11552 * 11553 * <p>The default range is the drawing height of this view.</p> 11554 * 11555 * @see #computeVerticalScrollExtent() 11556 * @see #computeVerticalScrollOffset() 11557 * @see android.widget.ScrollBarDrawable 11558 */ 11559 protected int computeVerticalScrollRange() { 11560 return getHeight(); 11561 } 11562 11563 /** 11564 * <p>Compute the vertical offset of the vertical scrollbar's thumb 11565 * within the horizontal range. This value is used to compute the position 11566 * of the thumb within the scrollbar's track.</p> 11567 * 11568 * <p>The range is expressed in arbitrary units that must be the same as the 11569 * units used by {@link #computeVerticalScrollRange()} and 11570 * {@link #computeVerticalScrollExtent()}.</p> 11571 * 11572 * <p>The default offset is the scroll offset of this view.</p> 11573 * 11574 * @return the vertical offset of the scrollbar's thumb 11575 * 11576 * @see #computeVerticalScrollRange() 11577 * @see #computeVerticalScrollExtent() 11578 * @see android.widget.ScrollBarDrawable 11579 */ 11580 protected int computeVerticalScrollOffset() { 11581 return mScrollY; 11582 } 11583 11584 /** 11585 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 11586 * within the vertical range. This value is used to compute the length 11587 * of the thumb within the scrollbar's track.</p> 11588 * 11589 * <p>The range is expressed in arbitrary units that must be the same as the 11590 * units used by {@link #computeVerticalScrollRange()} and 11591 * {@link #computeVerticalScrollOffset()}.</p> 11592 * 11593 * <p>The default extent is the drawing height of this view.</p> 11594 * 11595 * @return the vertical extent of the scrollbar's thumb 11596 * 11597 * @see #computeVerticalScrollRange() 11598 * @see #computeVerticalScrollOffset() 11599 * @see android.widget.ScrollBarDrawable 11600 */ 11601 protected int computeVerticalScrollExtent() { 11602 return getHeight(); 11603 } 11604 11605 /** 11606 * Check if this view can be scrolled horizontally in a certain direction. 11607 * 11608 * @param direction Negative to check scrolling left, positive to check scrolling right. 11609 * @return true if this view can be scrolled in the specified direction, false otherwise. 11610 */ 11611 public boolean canScrollHorizontally(int direction) { 11612 final int offset = computeHorizontalScrollOffset(); 11613 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 11614 if (range == 0) return false; 11615 if (direction < 0) { 11616 return offset > 0; 11617 } else { 11618 return offset < range - 1; 11619 } 11620 } 11621 11622 /** 11623 * Check if this view can be scrolled vertically in a certain direction. 11624 * 11625 * @param direction Negative to check scrolling up, positive to check scrolling down. 11626 * @return true if this view can be scrolled in the specified direction, false otherwise. 11627 */ 11628 public boolean canScrollVertically(int direction) { 11629 final int offset = computeVerticalScrollOffset(); 11630 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 11631 if (range == 0) return false; 11632 if (direction < 0) { 11633 return offset > 0; 11634 } else { 11635 return offset < range - 1; 11636 } 11637 } 11638 11639 /** 11640 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11641 * scrollbars are painted only if they have been awakened first.</p> 11642 * 11643 * @param canvas the canvas on which to draw the scrollbars 11644 * 11645 * @see #awakenScrollBars(int) 11646 */ 11647 protected final void onDrawScrollBars(Canvas canvas) { 11648 // scrollbars are drawn only when the animation is running 11649 final ScrollabilityCache cache = mScrollCache; 11650 if (cache != null) { 11651 11652 int state = cache.state; 11653 11654 if (state == ScrollabilityCache.OFF) { 11655 return; 11656 } 11657 11658 boolean invalidate = false; 11659 11660 if (state == ScrollabilityCache.FADING) { 11661 // We're fading -- get our fade interpolation 11662 if (cache.interpolatorValues == null) { 11663 cache.interpolatorValues = new float[1]; 11664 } 11665 11666 float[] values = cache.interpolatorValues; 11667 11668 // Stops the animation if we're done 11669 if (cache.scrollBarInterpolator.timeToValues(values) == 11670 Interpolator.Result.FREEZE_END) { 11671 cache.state = ScrollabilityCache.OFF; 11672 } else { 11673 cache.scrollBar.setAlpha(Math.round(values[0])); 11674 } 11675 11676 // This will make the scroll bars inval themselves after 11677 // drawing. We only want this when we're fading so that 11678 // we prevent excessive redraws 11679 invalidate = true; 11680 } else { 11681 // We're just on -- but we may have been fading before so 11682 // reset alpha 11683 cache.scrollBar.setAlpha(255); 11684 } 11685 11686 11687 final int viewFlags = mViewFlags; 11688 11689 final boolean drawHorizontalScrollBar = 11690 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11691 final boolean drawVerticalScrollBar = 11692 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11693 && !isVerticalScrollBarHidden(); 11694 11695 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11696 final int width = mRight - mLeft; 11697 final int height = mBottom - mTop; 11698 11699 final ScrollBarDrawable scrollBar = cache.scrollBar; 11700 11701 final int scrollX = mScrollX; 11702 final int scrollY = mScrollY; 11703 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11704 11705 int left; 11706 int top; 11707 int right; 11708 int bottom; 11709 11710 if (drawHorizontalScrollBar) { 11711 int size = scrollBar.getSize(false); 11712 if (size <= 0) { 11713 size = cache.scrollBarSize; 11714 } 11715 11716 scrollBar.setParameters(computeHorizontalScrollRange(), 11717 computeHorizontalScrollOffset(), 11718 computeHorizontalScrollExtent(), false); 11719 final int verticalScrollBarGap = drawVerticalScrollBar ? 11720 getVerticalScrollbarWidth() : 0; 11721 top = scrollY + height - size - (mUserPaddingBottom & inside); 11722 left = scrollX + (mPaddingLeft & inside); 11723 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11724 bottom = top + size; 11725 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11726 if (invalidate) { 11727 invalidate(left, top, right, bottom); 11728 } 11729 } 11730 11731 if (drawVerticalScrollBar) { 11732 int size = scrollBar.getSize(true); 11733 if (size <= 0) { 11734 size = cache.scrollBarSize; 11735 } 11736 11737 scrollBar.setParameters(computeVerticalScrollRange(), 11738 computeVerticalScrollOffset(), 11739 computeVerticalScrollExtent(), true); 11740 int verticalScrollbarPosition = mVerticalScrollbarPosition; 11741 if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) { 11742 verticalScrollbarPosition = isLayoutRtl() ? 11743 SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT; 11744 } 11745 switch (verticalScrollbarPosition) { 11746 default: 11747 case SCROLLBAR_POSITION_RIGHT: 11748 left = scrollX + width - size - (mUserPaddingRight & inside); 11749 break; 11750 case SCROLLBAR_POSITION_LEFT: 11751 left = scrollX + (mUserPaddingLeft & inside); 11752 break; 11753 } 11754 top = scrollY + (mPaddingTop & inside); 11755 right = left + size; 11756 bottom = scrollY + height - (mUserPaddingBottom & inside); 11757 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11758 if (invalidate) { 11759 invalidate(left, top, right, bottom); 11760 } 11761 } 11762 } 11763 } 11764 } 11765 11766 /** 11767 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11768 * FastScroller is visible. 11769 * @return whether to temporarily hide the vertical scrollbar 11770 * @hide 11771 */ 11772 protected boolean isVerticalScrollBarHidden() { 11773 return false; 11774 } 11775 11776 /** 11777 * <p>Draw the horizontal scrollbar if 11778 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11779 * 11780 * @param canvas the canvas on which to draw the scrollbar 11781 * @param scrollBar the scrollbar's drawable 11782 * 11783 * @see #isHorizontalScrollBarEnabled() 11784 * @see #computeHorizontalScrollRange() 11785 * @see #computeHorizontalScrollExtent() 11786 * @see #computeHorizontalScrollOffset() 11787 * @see android.widget.ScrollBarDrawable 11788 * @hide 11789 */ 11790 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11791 int l, int t, int r, int b) { 11792 scrollBar.setBounds(l, t, r, b); 11793 scrollBar.draw(canvas); 11794 } 11795 11796 /** 11797 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11798 * returns true.</p> 11799 * 11800 * @param canvas the canvas on which to draw the scrollbar 11801 * @param scrollBar the scrollbar's drawable 11802 * 11803 * @see #isVerticalScrollBarEnabled() 11804 * @see #computeVerticalScrollRange() 11805 * @see #computeVerticalScrollExtent() 11806 * @see #computeVerticalScrollOffset() 11807 * @see android.widget.ScrollBarDrawable 11808 * @hide 11809 */ 11810 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11811 int l, int t, int r, int b) { 11812 scrollBar.setBounds(l, t, r, b); 11813 scrollBar.draw(canvas); 11814 } 11815 11816 /** 11817 * Implement this to do your drawing. 11818 * 11819 * @param canvas the canvas on which the background will be drawn 11820 */ 11821 protected void onDraw(Canvas canvas) { 11822 } 11823 11824 /* 11825 * Caller is responsible for calling requestLayout if necessary. 11826 * (This allows addViewInLayout to not request a new layout.) 11827 */ 11828 void assignParent(ViewParent parent) { 11829 if (mParent == null) { 11830 mParent = parent; 11831 } else if (parent == null) { 11832 mParent = null; 11833 } else { 11834 throw new RuntimeException("view " + this + " being added, but" 11835 + " it already has a parent"); 11836 } 11837 } 11838 11839 /** 11840 * This is called when the view is attached to a window. At this point it 11841 * has a Surface and will start drawing. Note that this function is 11842 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11843 * however it may be called any time before the first onDraw -- including 11844 * before or after {@link #onMeasure(int, int)}. 11845 * 11846 * @see #onDetachedFromWindow() 11847 */ 11848 protected void onAttachedToWindow() { 11849 if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) { 11850 mParent.requestTransparentRegion(this); 11851 } 11852 11853 if ((mPrivateFlags & PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11854 initialAwakenScrollBars(); 11855 mPrivateFlags &= ~PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 11856 } 11857 11858 mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; 11859 11860 jumpDrawablesToCurrentState(); 11861 11862 clearAccessibilityFocus(); 11863 resetSubtreeAccessibilityStateChanged(); 11864 11865 if (isFocused()) { 11866 InputMethodManager imm = InputMethodManager.peekInstance(); 11867 imm.focusIn(this); 11868 } 11869 11870 if (mDisplayList != null) { 11871 mDisplayList.clearDirty(); 11872 } 11873 } 11874 11875 /** 11876 * Resolve all RTL related properties. 11877 * 11878 * @return true if resolution of RTL properties has been done 11879 * 11880 * @hide 11881 */ 11882 public boolean resolveRtlPropertiesIfNeeded() { 11883 if (!needRtlPropertiesResolution()) return false; 11884 11885 // Order is important here: LayoutDirection MUST be resolved first 11886 if (!isLayoutDirectionResolved()) { 11887 resolveLayoutDirection(); 11888 resolveLayoutParams(); 11889 } 11890 // ... then we can resolve the others properties depending on the resolved LayoutDirection. 11891 if (!isTextDirectionResolved()) { 11892 resolveTextDirection(); 11893 } 11894 if (!isTextAlignmentResolved()) { 11895 resolveTextAlignment(); 11896 } 11897 if (!isPaddingResolved()) { 11898 resolvePadding(); 11899 } 11900 if (!isDrawablesResolved()) { 11901 resolveDrawables(); 11902 } 11903 onRtlPropertiesChanged(getLayoutDirection()); 11904 return true; 11905 } 11906 11907 /** 11908 * Reset resolution of all RTL related properties. 11909 * 11910 * @hide 11911 */ 11912 public void resetRtlProperties() { 11913 resetResolvedLayoutDirection(); 11914 resetResolvedTextDirection(); 11915 resetResolvedTextAlignment(); 11916 resetResolvedPadding(); 11917 resetResolvedDrawables(); 11918 } 11919 11920 /** 11921 * @see #onScreenStateChanged(int) 11922 */ 11923 void dispatchScreenStateChanged(int screenState) { 11924 onScreenStateChanged(screenState); 11925 } 11926 11927 /** 11928 * This method is called whenever the state of the screen this view is 11929 * attached to changes. A state change will usually occurs when the screen 11930 * turns on or off (whether it happens automatically or the user does it 11931 * manually.) 11932 * 11933 * @param screenState The new state of the screen. Can be either 11934 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11935 */ 11936 public void onScreenStateChanged(int screenState) { 11937 } 11938 11939 /** 11940 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11941 */ 11942 private boolean hasRtlSupport() { 11943 return mContext.getApplicationInfo().hasRtlSupport(); 11944 } 11945 11946 /** 11947 * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or 11948 * RTL not supported) 11949 */ 11950 private boolean isRtlCompatibilityMode() { 11951 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 11952 return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport(); 11953 } 11954 11955 /** 11956 * @return true if RTL properties need resolution. 11957 * 11958 */ 11959 private boolean needRtlPropertiesResolution() { 11960 return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED; 11961 } 11962 11963 /** 11964 * Called when any RTL property (layout direction or text direction or text alignment) has 11965 * been changed. 11966 * 11967 * Subclasses need to override this method to take care of cached information that depends on the 11968 * resolved layout direction, or to inform child views that inherit their layout direction. 11969 * 11970 * The default implementation does nothing. 11971 * 11972 * @param layoutDirection the direction of the layout 11973 * 11974 * @see #LAYOUT_DIRECTION_LTR 11975 * @see #LAYOUT_DIRECTION_RTL 11976 */ 11977 public void onRtlPropertiesChanged(int layoutDirection) { 11978 } 11979 11980 /** 11981 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11982 * that the parent directionality can and will be resolved before its children. 11983 * 11984 * @return true if resolution has been done, false otherwise. 11985 * 11986 * @hide 11987 */ 11988 public boolean resolveLayoutDirection() { 11989 // Clear any previous layout direction resolution 11990 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 11991 11992 if (hasRtlSupport()) { 11993 // Set resolved depending on layout direction 11994 switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> 11995 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) { 11996 case LAYOUT_DIRECTION_INHERIT: 11997 // We cannot resolve yet. LTR is by default and let the resolution happen again 11998 // later to get the correct resolved value 11999 if (!canResolveLayoutDirection()) return false; 12000 12001 // Parent has not yet resolved, LTR is still the default 12002 try { 12003 if (!mParent.isLayoutDirectionResolved()) return false; 12004 12005 if (mParent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) { 12006 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 12007 } 12008 } catch (AbstractMethodError e) { 12009 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 12010 " does not fully implement ViewParent", e); 12011 } 12012 break; 12013 case LAYOUT_DIRECTION_RTL: 12014 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 12015 break; 12016 case LAYOUT_DIRECTION_LOCALE: 12017 if((LAYOUT_DIRECTION_RTL == 12018 TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) { 12019 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 12020 } 12021 break; 12022 default: 12023 // Nothing to do, LTR by default 12024 } 12025 } 12026 12027 // Set to resolved 12028 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 12029 return true; 12030 } 12031 12032 /** 12033 * Check if layout direction resolution can be done. 12034 * 12035 * @return true if layout direction resolution can be done otherwise return false. 12036 */ 12037 public boolean canResolveLayoutDirection() { 12038 switch (getRawLayoutDirection()) { 12039 case LAYOUT_DIRECTION_INHERIT: 12040 if (mParent != null) { 12041 try { 12042 return mParent.canResolveLayoutDirection(); 12043 } catch (AbstractMethodError e) { 12044 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 12045 " does not fully implement ViewParent", e); 12046 } 12047 } 12048 return false; 12049 12050 default: 12051 return true; 12052 } 12053 } 12054 12055 /** 12056 * Reset the resolved layout direction. Layout direction will be resolved during a call to 12057 * {@link #onMeasure(int, int)}. 12058 * 12059 * @hide 12060 */ 12061 public void resetResolvedLayoutDirection() { 12062 // Reset the current resolved bits 12063 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 12064 } 12065 12066 /** 12067 * @return true if the layout direction is inherited. 12068 * 12069 * @hide 12070 */ 12071 public boolean isLayoutDirectionInherited() { 12072 return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT); 12073 } 12074 12075 /** 12076 * @return true if layout direction has been resolved. 12077 */ 12078 public boolean isLayoutDirectionResolved() { 12079 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED; 12080 } 12081 12082 /** 12083 * Return if padding has been resolved 12084 * 12085 * @hide 12086 */ 12087 boolean isPaddingResolved() { 12088 return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED; 12089 } 12090 12091 /** 12092 * Resolves padding depending on layout direction, if applicable, and 12093 * recomputes internal padding values to adjust for scroll bars. 12094 * 12095 * @hide 12096 */ 12097 public void resolvePadding() { 12098 final int resolvedLayoutDirection = getLayoutDirection(); 12099 12100 if (!isRtlCompatibilityMode()) { 12101 // Post Jelly Bean MR1 case: we need to take the resolved layout direction into account. 12102 // If start / end padding are defined, they will be resolved (hence overriding) to 12103 // left / right or right / left depending on the resolved layout direction. 12104 // If start / end padding are not defined, use the left / right ones. 12105 switch (resolvedLayoutDirection) { 12106 case LAYOUT_DIRECTION_RTL: 12107 if (mUserPaddingStart != UNDEFINED_PADDING) { 12108 mUserPaddingRight = mUserPaddingStart; 12109 } else { 12110 mUserPaddingRight = mUserPaddingRightInitial; 12111 } 12112 if (mUserPaddingEnd != UNDEFINED_PADDING) { 12113 mUserPaddingLeft = mUserPaddingEnd; 12114 } else { 12115 mUserPaddingLeft = mUserPaddingLeftInitial; 12116 } 12117 break; 12118 case LAYOUT_DIRECTION_LTR: 12119 default: 12120 if (mUserPaddingStart != UNDEFINED_PADDING) { 12121 mUserPaddingLeft = mUserPaddingStart; 12122 } else { 12123 mUserPaddingLeft = mUserPaddingLeftInitial; 12124 } 12125 if (mUserPaddingEnd != UNDEFINED_PADDING) { 12126 mUserPaddingRight = mUserPaddingEnd; 12127 } else { 12128 mUserPaddingRight = mUserPaddingRightInitial; 12129 } 12130 } 12131 12132 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 12133 } 12134 12135 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 12136 onRtlPropertiesChanged(resolvedLayoutDirection); 12137 12138 mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED; 12139 } 12140 12141 /** 12142 * Reset the resolved layout direction. 12143 * 12144 * @hide 12145 */ 12146 public void resetResolvedPadding() { 12147 mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED; 12148 } 12149 12150 /** 12151 * This is called when the view is detached from a window. At this point it 12152 * no longer has a surface for drawing. 12153 * 12154 * @see #onAttachedToWindow() 12155 */ 12156 protected void onDetachedFromWindow() { 12157 mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 12158 mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; 12159 12160 removeUnsetPressCallback(); 12161 removeLongPressCallback(); 12162 removePerformClickCallback(); 12163 removeSendViewScrolledAccessibilityEventCallback(); 12164 12165 destroyDrawingCache(); 12166 destroyLayer(false); 12167 12168 cleanupDraw(); 12169 12170 mCurrentAnimation = null; 12171 mCurrentScene = null; 12172 } 12173 12174 private void cleanupDraw() { 12175 if (mAttachInfo != null) { 12176 if (mDisplayList != null) { 12177 mDisplayList.markDirty(); 12178 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 12179 } 12180 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 12181 } else { 12182 // Should never happen 12183 resetDisplayList(); 12184 } 12185 } 12186 12187 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 12188 } 12189 12190 /** 12191 * @return The number of times this view has been attached to a window 12192 */ 12193 protected int getWindowAttachCount() { 12194 return mWindowAttachCount; 12195 } 12196 12197 /** 12198 * Retrieve a unique token identifying the window this view is attached to. 12199 * @return Return the window's token for use in 12200 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 12201 */ 12202 public IBinder getWindowToken() { 12203 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 12204 } 12205 12206 /** 12207 * Retrieve the {@link WindowId} for the window this view is 12208 * currently attached to. 12209 */ 12210 public WindowId getWindowId() { 12211 if (mAttachInfo == null) { 12212 return null; 12213 } 12214 if (mAttachInfo.mWindowId == null) { 12215 try { 12216 mAttachInfo.mIWindowId = mAttachInfo.mSession.getWindowId( 12217 mAttachInfo.mWindowToken); 12218 mAttachInfo.mWindowId = new WindowId( 12219 mAttachInfo.mIWindowId); 12220 } catch (RemoteException e) { 12221 } 12222 } 12223 return mAttachInfo.mWindowId; 12224 } 12225 12226 /** 12227 * Retrieve a unique token identifying the top-level "real" window of 12228 * the window that this view is attached to. That is, this is like 12229 * {@link #getWindowToken}, except if the window this view in is a panel 12230 * window (attached to another containing window), then the token of 12231 * the containing window is returned instead. 12232 * 12233 * @return Returns the associated window token, either 12234 * {@link #getWindowToken()} or the containing window's token. 12235 */ 12236 public IBinder getApplicationWindowToken() { 12237 AttachInfo ai = mAttachInfo; 12238 if (ai != null) { 12239 IBinder appWindowToken = ai.mPanelParentWindowToken; 12240 if (appWindowToken == null) { 12241 appWindowToken = ai.mWindowToken; 12242 } 12243 return appWindowToken; 12244 } 12245 return null; 12246 } 12247 12248 /** 12249 * Gets the logical display to which the view's window has been attached. 12250 * 12251 * @return The logical display, or null if the view is not currently attached to a window. 12252 */ 12253 public Display getDisplay() { 12254 return mAttachInfo != null ? mAttachInfo.mDisplay : null; 12255 } 12256 12257 /** 12258 * Retrieve private session object this view hierarchy is using to 12259 * communicate with the window manager. 12260 * @return the session object to communicate with the window manager 12261 */ 12262 /*package*/ IWindowSession getWindowSession() { 12263 return mAttachInfo != null ? mAttachInfo.mSession : null; 12264 } 12265 12266 /** 12267 * @param info the {@link android.view.View.AttachInfo} to associated with 12268 * this view 12269 */ 12270 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 12271 //System.out.println("Attached! " + this); 12272 mAttachInfo = info; 12273 if (mOverlay != null) { 12274 mOverlay.getOverlayView().dispatchAttachedToWindow(info, visibility); 12275 } 12276 mWindowAttachCount++; 12277 // We will need to evaluate the drawable state at least once. 12278 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 12279 if (mFloatingTreeObserver != null) { 12280 info.mTreeObserver.merge(mFloatingTreeObserver); 12281 mFloatingTreeObserver = null; 12282 } 12283 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) { 12284 mAttachInfo.mScrollContainers.add(this); 12285 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 12286 } 12287 performCollectViewAttributes(mAttachInfo, visibility); 12288 onAttachedToWindow(); 12289 12290 ListenerInfo li = mListenerInfo; 12291 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12292 li != null ? li.mOnAttachStateChangeListeners : null; 12293 if (listeners != null && listeners.size() > 0) { 12294 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12295 // perform the dispatching. The iterator is a safe guard against listeners that 12296 // could mutate the list by calling the various add/remove methods. This prevents 12297 // the array from being modified while we iterate it. 12298 for (OnAttachStateChangeListener listener : listeners) { 12299 listener.onViewAttachedToWindow(this); 12300 } 12301 } 12302 12303 int vis = info.mWindowVisibility; 12304 if (vis != GONE) { 12305 onWindowVisibilityChanged(vis); 12306 } 12307 if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) { 12308 // If nobody has evaluated the drawable state yet, then do it now. 12309 refreshDrawableState(); 12310 } 12311 needGlobalAttributesUpdate(false); 12312 } 12313 12314 void dispatchDetachedFromWindow() { 12315 AttachInfo info = mAttachInfo; 12316 if (info != null) { 12317 int vis = info.mWindowVisibility; 12318 if (vis != GONE) { 12319 onWindowVisibilityChanged(GONE); 12320 } 12321 } 12322 12323 onDetachedFromWindow(); 12324 12325 ListenerInfo li = mListenerInfo; 12326 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12327 li != null ? li.mOnAttachStateChangeListeners : null; 12328 if (listeners != null && listeners.size() > 0) { 12329 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12330 // perform the dispatching. The iterator is a safe guard against listeners that 12331 // could mutate the list by calling the various add/remove methods. This prevents 12332 // the array from being modified while we iterate it. 12333 for (OnAttachStateChangeListener listener : listeners) { 12334 listener.onViewDetachedFromWindow(this); 12335 } 12336 } 12337 12338 if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 12339 mAttachInfo.mScrollContainers.remove(this); 12340 mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED; 12341 } 12342 12343 mAttachInfo = null; 12344 if (mOverlay != null) { 12345 mOverlay.getOverlayView().dispatchDetachedFromWindow(); 12346 } 12347 } 12348 12349 /** 12350 * Store this view hierarchy's frozen state into the given container. 12351 * 12352 * @param container The SparseArray in which to save the view's state. 12353 * 12354 * @see #restoreHierarchyState(android.util.SparseArray) 12355 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12356 * @see #onSaveInstanceState() 12357 */ 12358 public void saveHierarchyState(SparseArray<Parcelable> container) { 12359 dispatchSaveInstanceState(container); 12360 } 12361 12362 /** 12363 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 12364 * this view and its children. May be overridden to modify how freezing happens to a 12365 * view's children; for example, some views may want to not store state for their children. 12366 * 12367 * @param container The SparseArray in which to save the view's state. 12368 * 12369 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12370 * @see #saveHierarchyState(android.util.SparseArray) 12371 * @see #onSaveInstanceState() 12372 */ 12373 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 12374 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 12375 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12376 Parcelable state = onSaveInstanceState(); 12377 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12378 throw new IllegalStateException( 12379 "Derived class did not call super.onSaveInstanceState()"); 12380 } 12381 if (state != null) { 12382 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 12383 // + ": " + state); 12384 container.put(mID, state); 12385 } 12386 } 12387 } 12388 12389 /** 12390 * Hook allowing a view to generate a representation of its internal state 12391 * that can later be used to create a new instance with that same state. 12392 * This state should only contain information that is not persistent or can 12393 * not be reconstructed later. For example, you will never store your 12394 * current position on screen because that will be computed again when a 12395 * new instance of the view is placed in its view hierarchy. 12396 * <p> 12397 * Some examples of things you may store here: the current cursor position 12398 * in a text view (but usually not the text itself since that is stored in a 12399 * content provider or other persistent storage), the currently selected 12400 * item in a list view. 12401 * 12402 * @return Returns a Parcelable object containing the view's current dynamic 12403 * state, or null if there is nothing interesting to save. The 12404 * default implementation returns null. 12405 * @see #onRestoreInstanceState(android.os.Parcelable) 12406 * @see #saveHierarchyState(android.util.SparseArray) 12407 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12408 * @see #setSaveEnabled(boolean) 12409 */ 12410 protected Parcelable onSaveInstanceState() { 12411 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12412 return BaseSavedState.EMPTY_STATE; 12413 } 12414 12415 /** 12416 * Restore this view hierarchy's frozen state from the given container. 12417 * 12418 * @param container The SparseArray which holds previously frozen states. 12419 * 12420 * @see #saveHierarchyState(android.util.SparseArray) 12421 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12422 * @see #onRestoreInstanceState(android.os.Parcelable) 12423 */ 12424 public void restoreHierarchyState(SparseArray<Parcelable> container) { 12425 dispatchRestoreInstanceState(container); 12426 } 12427 12428 /** 12429 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 12430 * state for this view and its children. May be overridden to modify how restoring 12431 * happens to a view's children; for example, some views may want to not store state 12432 * for their children. 12433 * 12434 * @param container The SparseArray which holds previously saved state. 12435 * 12436 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12437 * @see #restoreHierarchyState(android.util.SparseArray) 12438 * @see #onRestoreInstanceState(android.os.Parcelable) 12439 */ 12440 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 12441 if (mID != NO_ID) { 12442 Parcelable state = container.get(mID); 12443 if (state != null) { 12444 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 12445 // + ": " + state); 12446 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12447 onRestoreInstanceState(state); 12448 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12449 throw new IllegalStateException( 12450 "Derived class did not call super.onRestoreInstanceState()"); 12451 } 12452 } 12453 } 12454 } 12455 12456 /** 12457 * Hook allowing a view to re-apply a representation of its internal state that had previously 12458 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 12459 * null state. 12460 * 12461 * @param state The frozen state that had previously been returned by 12462 * {@link #onSaveInstanceState}. 12463 * 12464 * @see #onSaveInstanceState() 12465 * @see #restoreHierarchyState(android.util.SparseArray) 12466 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12467 */ 12468 protected void onRestoreInstanceState(Parcelable state) { 12469 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12470 if (state != BaseSavedState.EMPTY_STATE && state != null) { 12471 throw new IllegalArgumentException("Wrong state class, expecting View State but " 12472 + "received " + state.getClass().toString() + " instead. This usually happens " 12473 + "when two views of different type have the same id in the same hierarchy. " 12474 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 12475 + "other views do not use the same id."); 12476 } 12477 } 12478 12479 /** 12480 * <p>Return the time at which the drawing of the view hierarchy started.</p> 12481 * 12482 * @return the drawing start time in milliseconds 12483 */ 12484 public long getDrawingTime() { 12485 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 12486 } 12487 12488 /** 12489 * <p>Enables or disables the duplication of the parent's state into this view. When 12490 * duplication is enabled, this view gets its drawable state from its parent rather 12491 * than from its own internal properties.</p> 12492 * 12493 * <p>Note: in the current implementation, setting this property to true after the 12494 * view was added to a ViewGroup might have no effect at all. This property should 12495 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 12496 * 12497 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 12498 * property is enabled, an exception will be thrown.</p> 12499 * 12500 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 12501 * parent, these states should not be affected by this method.</p> 12502 * 12503 * @param enabled True to enable duplication of the parent's drawable state, false 12504 * to disable it. 12505 * 12506 * @see #getDrawableState() 12507 * @see #isDuplicateParentStateEnabled() 12508 */ 12509 public void setDuplicateParentStateEnabled(boolean enabled) { 12510 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 12511 } 12512 12513 /** 12514 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 12515 * 12516 * @return True if this view's drawable state is duplicated from the parent, 12517 * false otherwise 12518 * 12519 * @see #getDrawableState() 12520 * @see #setDuplicateParentStateEnabled(boolean) 12521 */ 12522 public boolean isDuplicateParentStateEnabled() { 12523 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 12524 } 12525 12526 /** 12527 * <p>Specifies the type of layer backing this view. The layer can be 12528 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12529 * {@link #LAYER_TYPE_HARDWARE}.</p> 12530 * 12531 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12532 * instance that controls how the layer is composed on screen. The following 12533 * properties of the paint are taken into account when composing the layer:</p> 12534 * <ul> 12535 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12536 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12537 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12538 * </ul> 12539 * 12540 * <p>If this view has an alpha value set to < 1.0 by calling 12541 * {@link #setAlpha(float)}, the alpha value of the layer's paint is superceded 12542 * by this view's alpha value.</p> 12543 * 12544 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE}, 12545 * {@link #LAYER_TYPE_SOFTWARE} and {@link #LAYER_TYPE_HARDWARE} 12546 * for more information on when and how to use layers.</p> 12547 * 12548 * @param layerType The type of layer to use with this view, must be one of 12549 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12550 * {@link #LAYER_TYPE_HARDWARE} 12551 * @param paint The paint used to compose the layer. This argument is optional 12552 * and can be null. It is ignored when the layer type is 12553 * {@link #LAYER_TYPE_NONE} 12554 * 12555 * @see #getLayerType() 12556 * @see #LAYER_TYPE_NONE 12557 * @see #LAYER_TYPE_SOFTWARE 12558 * @see #LAYER_TYPE_HARDWARE 12559 * @see #setAlpha(float) 12560 * 12561 * @attr ref android.R.styleable#View_layerType 12562 */ 12563 public void setLayerType(int layerType, Paint paint) { 12564 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 12565 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 12566 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 12567 } 12568 12569 if (layerType == mLayerType) { 12570 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 12571 mLayerPaint = paint == null ? new Paint() : paint; 12572 invalidateParentCaches(); 12573 invalidate(true); 12574 } 12575 return; 12576 } 12577 12578 // Destroy any previous software drawing cache if needed 12579 switch (mLayerType) { 12580 case LAYER_TYPE_HARDWARE: 12581 destroyLayer(false); 12582 // fall through - non-accelerated views may use software layer mechanism instead 12583 case LAYER_TYPE_SOFTWARE: 12584 destroyDrawingCache(); 12585 break; 12586 default: 12587 break; 12588 } 12589 12590 mLayerType = layerType; 12591 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 12592 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 12593 mLocalDirtyRect = layerDisabled ? null : new Rect(); 12594 12595 invalidateParentCaches(); 12596 invalidate(true); 12597 } 12598 12599 /** 12600 * Updates the {@link Paint} object used with the current layer (used only if the current 12601 * layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint 12602 * provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time 12603 * the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to 12604 * ensure that the view gets redrawn immediately. 12605 * 12606 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12607 * instance that controls how the layer is composed on screen. The following 12608 * properties of the paint are taken into account when composing the layer:</p> 12609 * <ul> 12610 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12611 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12612 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12613 * </ul> 12614 * 12615 * <p>If this view has an alpha value set to < 1.0 by calling {@link #setAlpha(float)}, the 12616 * alpha value of the layer's paint is superceded by this view's alpha value.</p> 12617 * 12618 * @param paint The paint used to compose the layer. This argument is optional 12619 * and can be null. It is ignored when the layer type is 12620 * {@link #LAYER_TYPE_NONE} 12621 * 12622 * @see #setLayerType(int, android.graphics.Paint) 12623 */ 12624 public void setLayerPaint(Paint paint) { 12625 int layerType = getLayerType(); 12626 if (layerType != LAYER_TYPE_NONE) { 12627 mLayerPaint = paint == null ? new Paint() : paint; 12628 if (layerType == LAYER_TYPE_HARDWARE) { 12629 HardwareLayer layer = getHardwareLayer(); 12630 if (layer != null) { 12631 layer.setLayerPaint(paint); 12632 } 12633 invalidateViewProperty(false, false); 12634 } else { 12635 invalidate(); 12636 } 12637 } 12638 } 12639 12640 /** 12641 * Indicates whether this view has a static layer. A view with layer type 12642 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 12643 * dynamic. 12644 */ 12645 boolean hasStaticLayer() { 12646 return true; 12647 } 12648 12649 /** 12650 * Indicates what type of layer is currently associated with this view. By default 12651 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 12652 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 12653 * for more information on the different types of layers. 12654 * 12655 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12656 * {@link #LAYER_TYPE_HARDWARE} 12657 * 12658 * @see #setLayerType(int, android.graphics.Paint) 12659 * @see #buildLayer() 12660 * @see #LAYER_TYPE_NONE 12661 * @see #LAYER_TYPE_SOFTWARE 12662 * @see #LAYER_TYPE_HARDWARE 12663 */ 12664 public int getLayerType() { 12665 return mLayerType; 12666 } 12667 12668 /** 12669 * Forces this view's layer to be created and this view to be rendered 12670 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 12671 * invoking this method will have no effect. 12672 * 12673 * This method can for instance be used to render a view into its layer before 12674 * starting an animation. If this view is complex, rendering into the layer 12675 * before starting the animation will avoid skipping frames. 12676 * 12677 * @throws IllegalStateException If this view is not attached to a window 12678 * 12679 * @see #setLayerType(int, android.graphics.Paint) 12680 */ 12681 public void buildLayer() { 12682 if (mLayerType == LAYER_TYPE_NONE) return; 12683 12684 final AttachInfo attachInfo = mAttachInfo; 12685 if (attachInfo == null) { 12686 throw new IllegalStateException("This view must be attached to a window first"); 12687 } 12688 12689 switch (mLayerType) { 12690 case LAYER_TYPE_HARDWARE: 12691 if (attachInfo.mHardwareRenderer != null && 12692 attachInfo.mHardwareRenderer.isEnabled() && 12693 attachInfo.mHardwareRenderer.validate()) { 12694 getHardwareLayer(); 12695 // TODO: We need a better way to handle this case 12696 // If views have registered pre-draw listeners they need 12697 // to be notified before we build the layer. Those listeners 12698 // may however rely on other events to happen first so we 12699 // cannot just invoke them here until they don't cancel the 12700 // current frame 12701 if (!attachInfo.mTreeObserver.hasOnPreDrawListeners()) { 12702 attachInfo.mViewRootImpl.dispatchFlushHardwareLayerUpdates(); 12703 } 12704 } 12705 break; 12706 case LAYER_TYPE_SOFTWARE: 12707 buildDrawingCache(true); 12708 break; 12709 } 12710 } 12711 12712 /** 12713 * <p>Returns a hardware layer that can be used to draw this view again 12714 * without executing its draw method.</p> 12715 * 12716 * @return A HardwareLayer ready to render, or null if an error occurred. 12717 */ 12718 HardwareLayer getHardwareLayer() { 12719 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 12720 !mAttachInfo.mHardwareRenderer.isEnabled()) { 12721 return null; 12722 } 12723 12724 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 12725 12726 final int width = mRight - mLeft; 12727 final int height = mBottom - mTop; 12728 12729 if (width == 0 || height == 0) { 12730 return null; 12731 } 12732 12733 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 12734 if (mHardwareLayer == null) { 12735 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 12736 width, height, isOpaque()); 12737 mLocalDirtyRect.set(0, 0, width, height); 12738 } else { 12739 if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 12740 if (mHardwareLayer.resize(width, height)) { 12741 mLocalDirtyRect.set(0, 0, width, height); 12742 } 12743 } 12744 12745 // This should not be necessary but applications that change 12746 // the parameters of their background drawable without calling 12747 // this.setBackground(Drawable) can leave the view in a bad state 12748 // (for instance isOpaque() returns true, but the background is 12749 // not opaque.) 12750 computeOpaqueFlags(); 12751 12752 final boolean opaque = isOpaque(); 12753 if (mHardwareLayer.isValid() && mHardwareLayer.isOpaque() != opaque) { 12754 mHardwareLayer.setOpaque(opaque); 12755 mLocalDirtyRect.set(0, 0, width, height); 12756 } 12757 } 12758 12759 // The layer is not valid if the underlying GPU resources cannot be allocated 12760 if (!mHardwareLayer.isValid()) { 12761 return null; 12762 } 12763 12764 mHardwareLayer.setLayerPaint(mLayerPaint); 12765 mHardwareLayer.redrawLater(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 12766 ViewRootImpl viewRoot = getViewRootImpl(); 12767 if (viewRoot != null) viewRoot.pushHardwareLayerUpdate(mHardwareLayer); 12768 12769 mLocalDirtyRect.setEmpty(); 12770 } 12771 12772 return mHardwareLayer; 12773 } 12774 12775 /** 12776 * Destroys this View's hardware layer if possible. 12777 * 12778 * @return True if the layer was destroyed, false otherwise. 12779 * 12780 * @see #setLayerType(int, android.graphics.Paint) 12781 * @see #LAYER_TYPE_HARDWARE 12782 */ 12783 boolean destroyLayer(boolean valid) { 12784 if (mHardwareLayer != null) { 12785 AttachInfo info = mAttachInfo; 12786 if (info != null && info.mHardwareRenderer != null && 12787 info.mHardwareRenderer.isEnabled() && 12788 (valid || info.mHardwareRenderer.validate())) { 12789 12790 info.mHardwareRenderer.cancelLayerUpdate(mHardwareLayer); 12791 mHardwareLayer.destroy(); 12792 mHardwareLayer = null; 12793 12794 invalidate(true); 12795 invalidateParentCaches(); 12796 } 12797 return true; 12798 } 12799 return false; 12800 } 12801 12802 /** 12803 * Destroys all hardware rendering resources. This method is invoked 12804 * when the system needs to reclaim resources. Upon execution of this 12805 * method, you should free any OpenGL resources created by the view. 12806 * 12807 * Note: you <strong>must</strong> call 12808 * <code>super.destroyHardwareResources()</code> when overriding 12809 * this method. 12810 * 12811 * @hide 12812 */ 12813 protected void destroyHardwareResources() { 12814 resetDisplayList(); 12815 destroyLayer(true); 12816 } 12817 12818 /** 12819 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 12820 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 12821 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 12822 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 12823 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 12824 * null.</p> 12825 * 12826 * <p>Enabling the drawing cache is similar to 12827 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 12828 * acceleration is turned off. When hardware acceleration is turned on, enabling the 12829 * drawing cache has no effect on rendering because the system uses a different mechanism 12830 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 12831 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 12832 * for information on how to enable software and hardware layers.</p> 12833 * 12834 * <p>This API can be used to manually generate 12835 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 12836 * {@link #getDrawingCache()}.</p> 12837 * 12838 * @param enabled true to enable the drawing cache, false otherwise 12839 * 12840 * @see #isDrawingCacheEnabled() 12841 * @see #getDrawingCache() 12842 * @see #buildDrawingCache() 12843 * @see #setLayerType(int, android.graphics.Paint) 12844 */ 12845 public void setDrawingCacheEnabled(boolean enabled) { 12846 mCachingFailed = false; 12847 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12848 } 12849 12850 /** 12851 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12852 * 12853 * @return true if the drawing cache is enabled 12854 * 12855 * @see #setDrawingCacheEnabled(boolean) 12856 * @see #getDrawingCache() 12857 */ 12858 @ViewDebug.ExportedProperty(category = "drawing") 12859 public boolean isDrawingCacheEnabled() { 12860 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12861 } 12862 12863 /** 12864 * Debugging utility which recursively outputs the dirty state of a view and its 12865 * descendants. 12866 * 12867 * @hide 12868 */ 12869 @SuppressWarnings({"UnusedDeclaration"}) 12870 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12871 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.PFLAG_DIRTY_MASK) + 12872 ") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID(" + 12873 (mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID) + 12874 ") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")"); 12875 if (clear) { 12876 mPrivateFlags &= clearMask; 12877 } 12878 if (this instanceof ViewGroup) { 12879 ViewGroup parent = (ViewGroup) this; 12880 final int count = parent.getChildCount(); 12881 for (int i = 0; i < count; i++) { 12882 final View child = parent.getChildAt(i); 12883 child.outputDirtyFlags(indent + " ", clear, clearMask); 12884 } 12885 } 12886 } 12887 12888 /** 12889 * This method is used by ViewGroup to cause its children to restore or recreate their 12890 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12891 * to recreate its own display list, which would happen if it went through the normal 12892 * draw/dispatchDraw mechanisms. 12893 * 12894 * @hide 12895 */ 12896 protected void dispatchGetDisplayList() {} 12897 12898 /** 12899 * A view that is not attached or hardware accelerated cannot create a display list. 12900 * This method checks these conditions and returns the appropriate result. 12901 * 12902 * @return true if view has the ability to create a display list, false otherwise. 12903 * 12904 * @hide 12905 */ 12906 public boolean canHaveDisplayList() { 12907 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12908 } 12909 12910 /** 12911 * @return The {@link HardwareRenderer} associated with that view or null if 12912 * hardware rendering is not supported or this view is not attached 12913 * to a window. 12914 * 12915 * @hide 12916 */ 12917 public HardwareRenderer getHardwareRenderer() { 12918 if (mAttachInfo != null) { 12919 return mAttachInfo.mHardwareRenderer; 12920 } 12921 return null; 12922 } 12923 12924 /** 12925 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12926 * Otherwise, the same display list will be returned (after having been rendered into 12927 * along the way, depending on the invalidation state of the view). 12928 * 12929 * @param displayList The previous version of this displayList, could be null. 12930 * @param isLayer Whether the requester of the display list is a layer. If so, 12931 * the view will avoid creating a layer inside the resulting display list. 12932 * @return A new or reused DisplayList object. 12933 */ 12934 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12935 if (!canHaveDisplayList()) { 12936 return null; 12937 } 12938 12939 if (((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || 12940 displayList == null || !displayList.isValid() || 12941 (!isLayer && mRecreateDisplayList))) { 12942 // Don't need to recreate the display list, just need to tell our 12943 // children to restore/recreate theirs 12944 if (displayList != null && displayList.isValid() && 12945 !isLayer && !mRecreateDisplayList) { 12946 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12947 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12948 dispatchGetDisplayList(); 12949 12950 return displayList; 12951 } 12952 12953 if (!isLayer) { 12954 // If we got here, we're recreating it. Mark it as such to ensure that 12955 // we copy in child display lists into ours in drawChild() 12956 mRecreateDisplayList = true; 12957 } 12958 if (displayList == null) { 12959 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(getClass().getName()); 12960 // If we're creating a new display list, make sure our parent gets invalidated 12961 // since they will need to recreate their display list to account for this 12962 // new child display list. 12963 invalidateParentCaches(); 12964 } 12965 12966 boolean caching = false; 12967 int width = mRight - mLeft; 12968 int height = mBottom - mTop; 12969 int layerType = getLayerType(); 12970 12971 final HardwareCanvas canvas = displayList.start(width, height); 12972 12973 try { 12974 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12975 if (layerType == LAYER_TYPE_HARDWARE) { 12976 final HardwareLayer layer = getHardwareLayer(); 12977 if (layer != null && layer.isValid()) { 12978 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12979 } else { 12980 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12981 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12982 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12983 } 12984 caching = true; 12985 } else { 12986 buildDrawingCache(true); 12987 Bitmap cache = getDrawingCache(true); 12988 if (cache != null) { 12989 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12990 caching = true; 12991 } 12992 } 12993 } else { 12994 12995 computeScroll(); 12996 12997 canvas.translate(-mScrollX, -mScrollY); 12998 if (!isLayer) { 12999 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 13000 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13001 } 13002 13003 // Fast path for layouts with no backgrounds 13004 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13005 dispatchDraw(canvas); 13006 if (mOverlay != null && !mOverlay.isEmpty()) { 13007 mOverlay.getOverlayView().draw(canvas); 13008 } 13009 } else { 13010 draw(canvas); 13011 } 13012 } 13013 } finally { 13014 displayList.end(); 13015 displayList.setCaching(caching); 13016 if (isLayer) { 13017 displayList.setLeftTopRightBottom(0, 0, width, height); 13018 } else { 13019 setDisplayListProperties(displayList); 13020 } 13021 } 13022 } else if (!isLayer) { 13023 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 13024 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13025 } 13026 13027 return displayList; 13028 } 13029 13030 /** 13031 * Get the DisplayList for the HardwareLayer 13032 * 13033 * @param layer The HardwareLayer whose DisplayList we want 13034 * @return A DisplayList fopr the specified HardwareLayer 13035 */ 13036 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 13037 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 13038 layer.setDisplayList(displayList); 13039 return displayList; 13040 } 13041 13042 13043 /** 13044 * <p>Returns a display list that can be used to draw this view again 13045 * without executing its draw method.</p> 13046 * 13047 * @return A DisplayList ready to replay, or null if caching is not enabled. 13048 * 13049 * @hide 13050 */ 13051 public DisplayList getDisplayList() { 13052 mDisplayList = getDisplayList(mDisplayList, false); 13053 return mDisplayList; 13054 } 13055 13056 private void clearDisplayList() { 13057 if (mDisplayList != null) { 13058 mDisplayList.clear(); 13059 } 13060 } 13061 13062 private void resetDisplayList() { 13063 if (mDisplayList != null) { 13064 mDisplayList.reset(); 13065 } 13066 } 13067 13068 /** 13069 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 13070 * 13071 * @return A non-scaled bitmap representing this view or null if cache is disabled. 13072 * 13073 * @see #getDrawingCache(boolean) 13074 */ 13075 public Bitmap getDrawingCache() { 13076 return getDrawingCache(false); 13077 } 13078 13079 /** 13080 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 13081 * is null when caching is disabled. If caching is enabled and the cache is not ready, 13082 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 13083 * draw from the cache when the cache is enabled. To benefit from the cache, you must 13084 * request the drawing cache by calling this method and draw it on screen if the 13085 * returned bitmap is not null.</p> 13086 * 13087 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 13088 * this method will create a bitmap of the same size as this view. Because this bitmap 13089 * will be drawn scaled by the parent ViewGroup, the result on screen might show 13090 * scaling artifacts. To avoid such artifacts, you should call this method by setting 13091 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 13092 * size than the view. This implies that your application must be able to handle this 13093 * size.</p> 13094 * 13095 * @param autoScale Indicates whether the generated bitmap should be scaled based on 13096 * the current density of the screen when the application is in compatibility 13097 * mode. 13098 * 13099 * @return A bitmap representing this view or null if cache is disabled. 13100 * 13101 * @see #setDrawingCacheEnabled(boolean) 13102 * @see #isDrawingCacheEnabled() 13103 * @see #buildDrawingCache(boolean) 13104 * @see #destroyDrawingCache() 13105 */ 13106 public Bitmap getDrawingCache(boolean autoScale) { 13107 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 13108 return null; 13109 } 13110 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 13111 buildDrawingCache(autoScale); 13112 } 13113 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 13114 } 13115 13116 /** 13117 * <p>Frees the resources used by the drawing cache. If you call 13118 * {@link #buildDrawingCache()} manually without calling 13119 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 13120 * should cleanup the cache with this method afterwards.</p> 13121 * 13122 * @see #setDrawingCacheEnabled(boolean) 13123 * @see #buildDrawingCache() 13124 * @see #getDrawingCache() 13125 */ 13126 public void destroyDrawingCache() { 13127 if (mDrawingCache != null) { 13128 mDrawingCache.recycle(); 13129 mDrawingCache = null; 13130 } 13131 if (mUnscaledDrawingCache != null) { 13132 mUnscaledDrawingCache.recycle(); 13133 mUnscaledDrawingCache = null; 13134 } 13135 } 13136 13137 /** 13138 * Setting a solid background color for the drawing cache's bitmaps will improve 13139 * performance and memory usage. Note, though that this should only be used if this 13140 * view will always be drawn on top of a solid color. 13141 * 13142 * @param color The background color to use for the drawing cache's bitmap 13143 * 13144 * @see #setDrawingCacheEnabled(boolean) 13145 * @see #buildDrawingCache() 13146 * @see #getDrawingCache() 13147 */ 13148 public void setDrawingCacheBackgroundColor(int color) { 13149 if (color != mDrawingCacheBackgroundColor) { 13150 mDrawingCacheBackgroundColor = color; 13151 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 13152 } 13153 } 13154 13155 /** 13156 * @see #setDrawingCacheBackgroundColor(int) 13157 * 13158 * @return The background color to used for the drawing cache's bitmap 13159 */ 13160 public int getDrawingCacheBackgroundColor() { 13161 return mDrawingCacheBackgroundColor; 13162 } 13163 13164 /** 13165 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 13166 * 13167 * @see #buildDrawingCache(boolean) 13168 */ 13169 public void buildDrawingCache() { 13170 buildDrawingCache(false); 13171 } 13172 13173 /** 13174 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 13175 * 13176 * <p>If you call {@link #buildDrawingCache()} manually without calling 13177 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 13178 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 13179 * 13180 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 13181 * this method will create a bitmap of the same size as this view. Because this bitmap 13182 * will be drawn scaled by the parent ViewGroup, the result on screen might show 13183 * scaling artifacts. To avoid such artifacts, you should call this method by setting 13184 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 13185 * size than the view. This implies that your application must be able to handle this 13186 * size.</p> 13187 * 13188 * <p>You should avoid calling this method when hardware acceleration is enabled. If 13189 * you do not need the drawing cache bitmap, calling this method will increase memory 13190 * usage and cause the view to be rendered in software once, thus negatively impacting 13191 * performance.</p> 13192 * 13193 * @see #getDrawingCache() 13194 * @see #destroyDrawingCache() 13195 */ 13196 public void buildDrawingCache(boolean autoScale) { 13197 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ? 13198 mDrawingCache == null : mUnscaledDrawingCache == null)) { 13199 mCachingFailed = false; 13200 13201 int width = mRight - mLeft; 13202 int height = mBottom - mTop; 13203 13204 final AttachInfo attachInfo = mAttachInfo; 13205 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 13206 13207 if (autoScale && scalingRequired) { 13208 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 13209 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 13210 } 13211 13212 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 13213 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 13214 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 13215 13216 final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4); 13217 final long drawingCacheSize = 13218 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize(); 13219 if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) { 13220 if (width > 0 && height > 0) { 13221 Log.w(VIEW_LOG_TAG, "View too large to fit into drawing cache, needs " 13222 + projectedBitmapSize + " bytes, only " 13223 + drawingCacheSize + " available"); 13224 } 13225 destroyDrawingCache(); 13226 mCachingFailed = true; 13227 return; 13228 } 13229 13230 boolean clear = true; 13231 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 13232 13233 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 13234 Bitmap.Config quality; 13235 if (!opaque) { 13236 // Never pick ARGB_4444 because it looks awful 13237 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 13238 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 13239 case DRAWING_CACHE_QUALITY_AUTO: 13240 quality = Bitmap.Config.ARGB_8888; 13241 break; 13242 case DRAWING_CACHE_QUALITY_LOW: 13243 quality = Bitmap.Config.ARGB_8888; 13244 break; 13245 case DRAWING_CACHE_QUALITY_HIGH: 13246 quality = Bitmap.Config.ARGB_8888; 13247 break; 13248 default: 13249 quality = Bitmap.Config.ARGB_8888; 13250 break; 13251 } 13252 } else { 13253 // Optimization for translucent windows 13254 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 13255 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 13256 } 13257 13258 // Try to cleanup memory 13259 if (bitmap != null) bitmap.recycle(); 13260 13261 try { 13262 bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13263 width, height, quality); 13264 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 13265 if (autoScale) { 13266 mDrawingCache = bitmap; 13267 } else { 13268 mUnscaledDrawingCache = bitmap; 13269 } 13270 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 13271 } catch (OutOfMemoryError e) { 13272 // If there is not enough memory to create the bitmap cache, just 13273 // ignore the issue as bitmap caches are not required to draw the 13274 // view hierarchy 13275 if (autoScale) { 13276 mDrawingCache = null; 13277 } else { 13278 mUnscaledDrawingCache = null; 13279 } 13280 mCachingFailed = true; 13281 return; 13282 } 13283 13284 clear = drawingCacheBackgroundColor != 0; 13285 } 13286 13287 Canvas canvas; 13288 if (attachInfo != null) { 13289 canvas = attachInfo.mCanvas; 13290 if (canvas == null) { 13291 canvas = new Canvas(); 13292 } 13293 canvas.setBitmap(bitmap); 13294 // Temporarily clobber the cached Canvas in case one of our children 13295 // is also using a drawing cache. Without this, the children would 13296 // steal the canvas by attaching their own bitmap to it and bad, bad 13297 // thing would happen (invisible views, corrupted drawings, etc.) 13298 attachInfo.mCanvas = null; 13299 } else { 13300 // This case should hopefully never or seldom happen 13301 canvas = new Canvas(bitmap); 13302 } 13303 13304 if (clear) { 13305 bitmap.eraseColor(drawingCacheBackgroundColor); 13306 } 13307 13308 computeScroll(); 13309 final int restoreCount = canvas.save(); 13310 13311 if (autoScale && scalingRequired) { 13312 final float scale = attachInfo.mApplicationScale; 13313 canvas.scale(scale, scale); 13314 } 13315 13316 canvas.translate(-mScrollX, -mScrollY); 13317 13318 mPrivateFlags |= PFLAG_DRAWN; 13319 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 13320 mLayerType != LAYER_TYPE_NONE) { 13321 mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID; 13322 } 13323 13324 // Fast path for layouts with no backgrounds 13325 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13326 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13327 dispatchDraw(canvas); 13328 if (mOverlay != null && !mOverlay.isEmpty()) { 13329 mOverlay.getOverlayView().draw(canvas); 13330 } 13331 } else { 13332 draw(canvas); 13333 } 13334 13335 canvas.restoreToCount(restoreCount); 13336 canvas.setBitmap(null); 13337 13338 if (attachInfo != null) { 13339 // Restore the cached Canvas for our siblings 13340 attachInfo.mCanvas = canvas; 13341 } 13342 } 13343 } 13344 13345 /** 13346 * Create a snapshot of the view into a bitmap. We should probably make 13347 * some form of this public, but should think about the API. 13348 */ 13349 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 13350 int width = mRight - mLeft; 13351 int height = mBottom - mTop; 13352 13353 final AttachInfo attachInfo = mAttachInfo; 13354 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 13355 width = (int) ((width * scale) + 0.5f); 13356 height = (int) ((height * scale) + 0.5f); 13357 13358 Bitmap bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13359 width > 0 ? width : 1, height > 0 ? height : 1, quality); 13360 if (bitmap == null) { 13361 throw new OutOfMemoryError(); 13362 } 13363 13364 Resources resources = getResources(); 13365 if (resources != null) { 13366 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 13367 } 13368 13369 Canvas canvas; 13370 if (attachInfo != null) { 13371 canvas = attachInfo.mCanvas; 13372 if (canvas == null) { 13373 canvas = new Canvas(); 13374 } 13375 canvas.setBitmap(bitmap); 13376 // Temporarily clobber the cached Canvas in case one of our children 13377 // is also using a drawing cache. Without this, the children would 13378 // steal the canvas by attaching their own bitmap to it and bad, bad 13379 // things would happen (invisible views, corrupted drawings, etc.) 13380 attachInfo.mCanvas = null; 13381 } else { 13382 // This case should hopefully never or seldom happen 13383 canvas = new Canvas(bitmap); 13384 } 13385 13386 if ((backgroundColor & 0xff000000) != 0) { 13387 bitmap.eraseColor(backgroundColor); 13388 } 13389 13390 computeScroll(); 13391 final int restoreCount = canvas.save(); 13392 canvas.scale(scale, scale); 13393 canvas.translate(-mScrollX, -mScrollY); 13394 13395 // Temporarily remove the dirty mask 13396 int flags = mPrivateFlags; 13397 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13398 13399 // Fast path for layouts with no backgrounds 13400 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13401 dispatchDraw(canvas); 13402 } else { 13403 draw(canvas); 13404 } 13405 13406 mPrivateFlags = flags; 13407 13408 canvas.restoreToCount(restoreCount); 13409 canvas.setBitmap(null); 13410 13411 if (attachInfo != null) { 13412 // Restore the cached Canvas for our siblings 13413 attachInfo.mCanvas = canvas; 13414 } 13415 13416 return bitmap; 13417 } 13418 13419 /** 13420 * Indicates whether this View is currently in edit mode. A View is usually 13421 * in edit mode when displayed within a developer tool. For instance, if 13422 * this View is being drawn by a visual user interface builder, this method 13423 * should return true. 13424 * 13425 * Subclasses should check the return value of this method to provide 13426 * different behaviors if their normal behavior might interfere with the 13427 * host environment. For instance: the class spawns a thread in its 13428 * constructor, the drawing code relies on device-specific features, etc. 13429 * 13430 * This method is usually checked in the drawing code of custom widgets. 13431 * 13432 * @return True if this View is in edit mode, false otherwise. 13433 */ 13434 public boolean isInEditMode() { 13435 return false; 13436 } 13437 13438 /** 13439 * If the View draws content inside its padding and enables fading edges, 13440 * it needs to support padding offsets. Padding offsets are added to the 13441 * fading edges to extend the length of the fade so that it covers pixels 13442 * drawn inside the padding. 13443 * 13444 * Subclasses of this class should override this method if they need 13445 * to draw content inside the padding. 13446 * 13447 * @return True if padding offset must be applied, false otherwise. 13448 * 13449 * @see #getLeftPaddingOffset() 13450 * @see #getRightPaddingOffset() 13451 * @see #getTopPaddingOffset() 13452 * @see #getBottomPaddingOffset() 13453 * 13454 * @since CURRENT 13455 */ 13456 protected boolean isPaddingOffsetRequired() { 13457 return false; 13458 } 13459 13460 /** 13461 * Amount by which to extend the left fading region. Called only when 13462 * {@link #isPaddingOffsetRequired()} returns true. 13463 * 13464 * @return The left padding offset in pixels. 13465 * 13466 * @see #isPaddingOffsetRequired() 13467 * 13468 * @since CURRENT 13469 */ 13470 protected int getLeftPaddingOffset() { 13471 return 0; 13472 } 13473 13474 /** 13475 * Amount by which to extend the right fading region. Called only when 13476 * {@link #isPaddingOffsetRequired()} returns true. 13477 * 13478 * @return The right padding offset in pixels. 13479 * 13480 * @see #isPaddingOffsetRequired() 13481 * 13482 * @since CURRENT 13483 */ 13484 protected int getRightPaddingOffset() { 13485 return 0; 13486 } 13487 13488 /** 13489 * Amount by which to extend the top fading region. Called only when 13490 * {@link #isPaddingOffsetRequired()} returns true. 13491 * 13492 * @return The top padding offset in pixels. 13493 * 13494 * @see #isPaddingOffsetRequired() 13495 * 13496 * @since CURRENT 13497 */ 13498 protected int getTopPaddingOffset() { 13499 return 0; 13500 } 13501 13502 /** 13503 * Amount by which to extend the bottom fading region. Called only when 13504 * {@link #isPaddingOffsetRequired()} returns true. 13505 * 13506 * @return The bottom padding offset in pixels. 13507 * 13508 * @see #isPaddingOffsetRequired() 13509 * 13510 * @since CURRENT 13511 */ 13512 protected int getBottomPaddingOffset() { 13513 return 0; 13514 } 13515 13516 /** 13517 * @hide 13518 * @param offsetRequired 13519 */ 13520 protected int getFadeTop(boolean offsetRequired) { 13521 int top = mPaddingTop; 13522 if (offsetRequired) top += getTopPaddingOffset(); 13523 return top; 13524 } 13525 13526 /** 13527 * @hide 13528 * @param offsetRequired 13529 */ 13530 protected int getFadeHeight(boolean offsetRequired) { 13531 int padding = mPaddingTop; 13532 if (offsetRequired) padding += getTopPaddingOffset(); 13533 return mBottom - mTop - mPaddingBottom - padding; 13534 } 13535 13536 /** 13537 * <p>Indicates whether this view is attached to a hardware accelerated 13538 * window or not.</p> 13539 * 13540 * <p>Even if this method returns true, it does not mean that every call 13541 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 13542 * accelerated {@link android.graphics.Canvas}. For instance, if this view 13543 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 13544 * window is hardware accelerated, 13545 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 13546 * return false, and this method will return true.</p> 13547 * 13548 * @return True if the view is attached to a window and the window is 13549 * hardware accelerated; false in any other case. 13550 */ 13551 public boolean isHardwareAccelerated() { 13552 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13553 } 13554 13555 /** 13556 * Sets a rectangular area on this view to which the view will be clipped 13557 * when it is drawn. Setting the value to null will remove the clip bounds 13558 * and the view will draw normally, using its full bounds. 13559 * 13560 * @param clipBounds The rectangular area, in the local coordinates of 13561 * this view, to which future drawing operations will be clipped. 13562 */ 13563 public void setClipBounds(Rect clipBounds) { 13564 if (clipBounds != null) { 13565 if (clipBounds.equals(mClipBounds)) { 13566 return; 13567 } 13568 if (mClipBounds == null) { 13569 invalidate(); 13570 mClipBounds = new Rect(clipBounds); 13571 } else { 13572 invalidate(Math.min(mClipBounds.left, clipBounds.left), 13573 Math.min(mClipBounds.top, clipBounds.top), 13574 Math.max(mClipBounds.right, clipBounds.right), 13575 Math.max(mClipBounds.bottom, clipBounds.bottom)); 13576 mClipBounds.set(clipBounds); 13577 } 13578 } else { 13579 if (mClipBounds != null) { 13580 invalidate(); 13581 mClipBounds = null; 13582 } 13583 } 13584 } 13585 13586 /** 13587 * Returns a copy of the current {@link #setClipBounds(Rect) clipBounds}. 13588 * 13589 * @return A copy of the current clip bounds if clip bounds are set, 13590 * otherwise null. 13591 */ 13592 public Rect getClipBounds() { 13593 return (mClipBounds != null) ? new Rect(mClipBounds) : null; 13594 } 13595 13596 /** 13597 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 13598 * case of an active Animation being run on the view. 13599 */ 13600 private boolean drawAnimation(ViewGroup parent, long drawingTime, 13601 Animation a, boolean scalingRequired) { 13602 Transformation invalidationTransform; 13603 final int flags = parent.mGroupFlags; 13604 final boolean initialized = a.isInitialized(); 13605 if (!initialized) { 13606 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 13607 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 13608 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 13609 onAnimationStart(); 13610 } 13611 13612 final Transformation t = parent.getChildTransformation(); 13613 boolean more = a.getTransformation(drawingTime, t, 1f); 13614 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 13615 if (parent.mInvalidationTransformation == null) { 13616 parent.mInvalidationTransformation = new Transformation(); 13617 } 13618 invalidationTransform = parent.mInvalidationTransformation; 13619 a.getTransformation(drawingTime, invalidationTransform, 1f); 13620 } else { 13621 invalidationTransform = t; 13622 } 13623 13624 if (more) { 13625 if (!a.willChangeBounds()) { 13626 if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) == 13627 ViewGroup.FLAG_OPTIMIZE_INVALIDATE) { 13628 parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED; 13629 } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) { 13630 // The child need to draw an animation, potentially offscreen, so 13631 // make sure we do not cancel invalidate requests 13632 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13633 parent.invalidate(mLeft, mTop, mRight, mBottom); 13634 } 13635 } else { 13636 if (parent.mInvalidateRegion == null) { 13637 parent.mInvalidateRegion = new RectF(); 13638 } 13639 final RectF region = parent.mInvalidateRegion; 13640 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 13641 invalidationTransform); 13642 13643 // The child need to draw an animation, potentially offscreen, so 13644 // make sure we do not cancel invalidate requests 13645 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13646 13647 final int left = mLeft + (int) region.left; 13648 final int top = mTop + (int) region.top; 13649 parent.invalidate(left, top, left + (int) (region.width() + .5f), 13650 top + (int) (region.height() + .5f)); 13651 } 13652 } 13653 return more; 13654 } 13655 13656 /** 13657 * This method is called by getDisplayList() when a display list is created or re-rendered. 13658 * It sets or resets the current value of all properties on that display list (resetting is 13659 * necessary when a display list is being re-created, because we need to make sure that 13660 * previously-set transform values 13661 */ 13662 void setDisplayListProperties(DisplayList displayList) { 13663 if (displayList != null) { 13664 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13665 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 13666 if (mParent instanceof ViewGroup) { 13667 displayList.setClipToBounds( 13668 (((ViewGroup) mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 13669 } 13670 float alpha = 1; 13671 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 13672 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13673 ViewGroup parentVG = (ViewGroup) mParent; 13674 final Transformation t = parentVG.getChildTransformation(); 13675 if (parentVG.getChildStaticTransformation(this, t)) { 13676 final int transformType = t.getTransformationType(); 13677 if (transformType != Transformation.TYPE_IDENTITY) { 13678 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 13679 alpha = t.getAlpha(); 13680 } 13681 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 13682 displayList.setMatrix(t.getMatrix()); 13683 } 13684 } 13685 } 13686 } 13687 if (mTransformationInfo != null) { 13688 alpha *= mTransformationInfo.mAlpha; 13689 if (alpha < 1) { 13690 final int multipliedAlpha = (int) (255 * alpha); 13691 if (onSetAlpha(multipliedAlpha)) { 13692 alpha = 1; 13693 } 13694 } 13695 displayList.setTransformationInfo(alpha, 13696 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 13697 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 13698 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 13699 mTransformationInfo.mScaleY); 13700 if (mTransformationInfo.mCamera == null) { 13701 mTransformationInfo.mCamera = new Camera(); 13702 mTransformationInfo.matrix3D = new Matrix(); 13703 } 13704 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 13705 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == PFLAG_PIVOT_EXPLICITLY_SET) { 13706 displayList.setPivotX(getPivotX()); 13707 displayList.setPivotY(getPivotY()); 13708 } 13709 } else if (alpha < 1) { 13710 displayList.setAlpha(alpha); 13711 } 13712 } 13713 } 13714 13715 /** 13716 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 13717 * This draw() method is an implementation detail and is not intended to be overridden or 13718 * to be called from anywhere else other than ViewGroup.drawChild(). 13719 */ 13720 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 13721 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13722 boolean more = false; 13723 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 13724 final int flags = parent.mGroupFlags; 13725 13726 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 13727 parent.getChildTransformation().clear(); 13728 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13729 } 13730 13731 Transformation transformToApply = null; 13732 boolean concatMatrix = false; 13733 13734 boolean scalingRequired = false; 13735 boolean caching; 13736 int layerType = getLayerType(); 13737 13738 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 13739 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 13740 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 13741 caching = true; 13742 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 13743 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 13744 } else { 13745 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 13746 } 13747 13748 final Animation a = getAnimation(); 13749 if (a != null) { 13750 more = drawAnimation(parent, drawingTime, a, scalingRequired); 13751 concatMatrix = a.willChangeTransformationMatrix(); 13752 if (concatMatrix) { 13753 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13754 } 13755 transformToApply = parent.getChildTransformation(); 13756 } else { 13757 if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) == 13758 PFLAG3_VIEW_IS_ANIMATING_TRANSFORM && mDisplayList != null) { 13759 // No longer animating: clear out old animation matrix 13760 mDisplayList.setAnimationMatrix(null); 13761 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13762 } 13763 if (!useDisplayListProperties && 13764 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13765 final Transformation t = parent.getChildTransformation(); 13766 final boolean hasTransform = parent.getChildStaticTransformation(this, t); 13767 if (hasTransform) { 13768 final int transformType = t.getTransformationType(); 13769 transformToApply = transformType != Transformation.TYPE_IDENTITY ? t : null; 13770 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 13771 } 13772 } 13773 } 13774 13775 concatMatrix |= !childHasIdentityMatrix; 13776 13777 // Sets the flag as early as possible to allow draw() implementations 13778 // to call invalidate() successfully when doing animations 13779 mPrivateFlags |= PFLAG_DRAWN; 13780 13781 if (!concatMatrix && 13782 (flags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS | 13783 ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN && 13784 canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 13785 (mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) { 13786 mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED; 13787 return more; 13788 } 13789 mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED; 13790 13791 if (hardwareAccelerated) { 13792 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 13793 // retain the flag's value temporarily in the mRecreateDisplayList flag 13794 mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED; 13795 mPrivateFlags &= ~PFLAG_INVALIDATED; 13796 } 13797 13798 DisplayList displayList = null; 13799 Bitmap cache = null; 13800 boolean hasDisplayList = false; 13801 if (caching) { 13802 if (!hardwareAccelerated) { 13803 if (layerType != LAYER_TYPE_NONE) { 13804 layerType = LAYER_TYPE_SOFTWARE; 13805 buildDrawingCache(true); 13806 } 13807 cache = getDrawingCache(true); 13808 } else { 13809 switch (layerType) { 13810 case LAYER_TYPE_SOFTWARE: 13811 if (useDisplayListProperties) { 13812 hasDisplayList = canHaveDisplayList(); 13813 } else { 13814 buildDrawingCache(true); 13815 cache = getDrawingCache(true); 13816 } 13817 break; 13818 case LAYER_TYPE_HARDWARE: 13819 if (useDisplayListProperties) { 13820 hasDisplayList = canHaveDisplayList(); 13821 } 13822 break; 13823 case LAYER_TYPE_NONE: 13824 // Delay getting the display list until animation-driven alpha values are 13825 // set up and possibly passed on to the view 13826 hasDisplayList = canHaveDisplayList(); 13827 break; 13828 } 13829 } 13830 } 13831 useDisplayListProperties &= hasDisplayList; 13832 if (useDisplayListProperties) { 13833 displayList = getDisplayList(); 13834 if (!displayList.isValid()) { 13835 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13836 // to getDisplayList(), the display list will be marked invalid and we should not 13837 // try to use it again. 13838 displayList = null; 13839 hasDisplayList = false; 13840 useDisplayListProperties = false; 13841 } 13842 } 13843 13844 int sx = 0; 13845 int sy = 0; 13846 if (!hasDisplayList) { 13847 computeScroll(); 13848 sx = mScrollX; 13849 sy = mScrollY; 13850 } 13851 13852 final boolean hasNoCache = cache == null || hasDisplayList; 13853 final boolean offsetForScroll = cache == null && !hasDisplayList && 13854 layerType != LAYER_TYPE_HARDWARE; 13855 13856 int restoreTo = -1; 13857 if (!useDisplayListProperties || transformToApply != null) { 13858 restoreTo = canvas.save(); 13859 } 13860 if (offsetForScroll) { 13861 canvas.translate(mLeft - sx, mTop - sy); 13862 } else { 13863 if (!useDisplayListProperties) { 13864 canvas.translate(mLeft, mTop); 13865 } 13866 if (scalingRequired) { 13867 if (useDisplayListProperties) { 13868 // TODO: Might not need this if we put everything inside the DL 13869 restoreTo = canvas.save(); 13870 } 13871 // mAttachInfo cannot be null, otherwise scalingRequired == false 13872 final float scale = 1.0f / mAttachInfo.mApplicationScale; 13873 canvas.scale(scale, scale); 13874 } 13875 } 13876 13877 float alpha = useDisplayListProperties ? 1 : getAlpha(); 13878 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || 13879 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13880 if (transformToApply != null || !childHasIdentityMatrix) { 13881 int transX = 0; 13882 int transY = 0; 13883 13884 if (offsetForScroll) { 13885 transX = -sx; 13886 transY = -sy; 13887 } 13888 13889 if (transformToApply != null) { 13890 if (concatMatrix) { 13891 if (useDisplayListProperties) { 13892 displayList.setAnimationMatrix(transformToApply.getMatrix()); 13893 } else { 13894 // Undo the scroll translation, apply the transformation matrix, 13895 // then redo the scroll translate to get the correct result. 13896 canvas.translate(-transX, -transY); 13897 canvas.concat(transformToApply.getMatrix()); 13898 canvas.translate(transX, transY); 13899 } 13900 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13901 } 13902 13903 float transformAlpha = transformToApply.getAlpha(); 13904 if (transformAlpha < 1) { 13905 alpha *= transformAlpha; 13906 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13907 } 13908 } 13909 13910 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13911 canvas.translate(-transX, -transY); 13912 canvas.concat(getMatrix()); 13913 canvas.translate(transX, transY); 13914 } 13915 } 13916 13917 // Deal with alpha if it is or used to be <1 13918 if (alpha < 1 || 13919 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13920 if (alpha < 1) { 13921 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13922 } else { 13923 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13924 } 13925 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13926 if (hasNoCache) { 13927 final int multipliedAlpha = (int) (255 * alpha); 13928 if (!onSetAlpha(multipliedAlpha)) { 13929 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13930 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13931 layerType != LAYER_TYPE_NONE) { 13932 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13933 } 13934 if (useDisplayListProperties) { 13935 displayList.setAlpha(alpha * getAlpha()); 13936 } else if (layerType == LAYER_TYPE_NONE) { 13937 final int scrollX = hasDisplayList ? 0 : sx; 13938 final int scrollY = hasDisplayList ? 0 : sy; 13939 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13940 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13941 } 13942 } else { 13943 // Alpha is handled by the child directly, clobber the layer's alpha 13944 mPrivateFlags |= PFLAG_ALPHA_SET; 13945 } 13946 } 13947 } 13948 } else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 13949 onSetAlpha(255); 13950 mPrivateFlags &= ~PFLAG_ALPHA_SET; 13951 } 13952 13953 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13954 !useDisplayListProperties && cache == null) { 13955 if (offsetForScroll) { 13956 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13957 } else { 13958 if (!scalingRequired || cache == null) { 13959 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13960 } else { 13961 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13962 } 13963 } 13964 } 13965 13966 if (!useDisplayListProperties && hasDisplayList) { 13967 displayList = getDisplayList(); 13968 if (!displayList.isValid()) { 13969 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13970 // to getDisplayList(), the display list will be marked invalid and we should not 13971 // try to use it again. 13972 displayList = null; 13973 hasDisplayList = false; 13974 } 13975 } 13976 13977 if (hasNoCache) { 13978 boolean layerRendered = false; 13979 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13980 final HardwareLayer layer = getHardwareLayer(); 13981 if (layer != null && layer.isValid()) { 13982 mLayerPaint.setAlpha((int) (alpha * 255)); 13983 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13984 layerRendered = true; 13985 } else { 13986 final int scrollX = hasDisplayList ? 0 : sx; 13987 final int scrollY = hasDisplayList ? 0 : sy; 13988 canvas.saveLayer(scrollX, scrollY, 13989 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13990 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13991 } 13992 } 13993 13994 if (!layerRendered) { 13995 if (!hasDisplayList) { 13996 // Fast path for layouts with no backgrounds 13997 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13998 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13999 dispatchDraw(canvas); 14000 } else { 14001 draw(canvas); 14002 } 14003 } else { 14004 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 14005 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 14006 } 14007 } 14008 } else if (cache != null) { 14009 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 14010 Paint cachePaint; 14011 14012 if (layerType == LAYER_TYPE_NONE) { 14013 cachePaint = parent.mCachePaint; 14014 if (cachePaint == null) { 14015 cachePaint = new Paint(); 14016 cachePaint.setDither(false); 14017 parent.mCachePaint = cachePaint; 14018 } 14019 if (alpha < 1) { 14020 cachePaint.setAlpha((int) (alpha * 255)); 14021 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 14022 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 14023 cachePaint.setAlpha(255); 14024 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 14025 } 14026 } else { 14027 cachePaint = mLayerPaint; 14028 cachePaint.setAlpha((int) (alpha * 255)); 14029 } 14030 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 14031 } 14032 14033 if (restoreTo >= 0) { 14034 canvas.restoreToCount(restoreTo); 14035 } 14036 14037 if (a != null && !more) { 14038 if (!hardwareAccelerated && !a.getFillAfter()) { 14039 onSetAlpha(255); 14040 } 14041 parent.finishAnimatingView(this, a); 14042 } 14043 14044 if (more && hardwareAccelerated) { 14045 if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 14046 // alpha animations should cause the child to recreate its display list 14047 invalidate(true); 14048 } 14049 } 14050 14051 mRecreateDisplayList = false; 14052 14053 return more; 14054 } 14055 14056 /** 14057 * Manually render this view (and all of its children) to the given Canvas. 14058 * The view must have already done a full layout before this function is 14059 * called. When implementing a view, implement 14060 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 14061 * If you do need to override this method, call the superclass version. 14062 * 14063 * @param canvas The Canvas to which the View is rendered. 14064 */ 14065 public void draw(Canvas canvas) { 14066 if (mClipBounds != null) { 14067 canvas.clipRect(mClipBounds); 14068 } 14069 final int privateFlags = mPrivateFlags; 14070 final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE && 14071 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 14072 mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 14073 14074 /* 14075 * Draw traversal performs several drawing steps which must be executed 14076 * in the appropriate order: 14077 * 14078 * 1. Draw the background 14079 * 2. If necessary, save the canvas' layers to prepare for fading 14080 * 3. Draw view's content 14081 * 4. Draw children 14082 * 5. If necessary, draw the fading edges and restore layers 14083 * 6. Draw decorations (scrollbars for instance) 14084 */ 14085 14086 // Step 1, draw the background, if needed 14087 int saveCount; 14088 14089 if (!dirtyOpaque) { 14090 final Drawable background = mBackground; 14091 if (background != null) { 14092 final int scrollX = mScrollX; 14093 final int scrollY = mScrollY; 14094 14095 if (mBackgroundSizeChanged) { 14096 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 14097 mBackgroundSizeChanged = false; 14098 } 14099 14100 if ((scrollX | scrollY) == 0) { 14101 background.draw(canvas); 14102 } else { 14103 canvas.translate(scrollX, scrollY); 14104 background.draw(canvas); 14105 canvas.translate(-scrollX, -scrollY); 14106 } 14107 } 14108 } 14109 14110 // skip step 2 & 5 if possible (common case) 14111 final int viewFlags = mViewFlags; 14112 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 14113 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 14114 if (!verticalEdges && !horizontalEdges) { 14115 // Step 3, draw the content 14116 if (!dirtyOpaque) onDraw(canvas); 14117 14118 // Step 4, draw the children 14119 dispatchDraw(canvas); 14120 14121 // Step 6, draw decorations (scrollbars) 14122 onDrawScrollBars(canvas); 14123 14124 if (mOverlay != null && !mOverlay.isEmpty()) { 14125 mOverlay.getOverlayView().dispatchDraw(canvas); 14126 } 14127 14128 // we're done... 14129 return; 14130 } 14131 14132 /* 14133 * Here we do the full fledged routine... 14134 * (this is an uncommon case where speed matters less, 14135 * this is why we repeat some of the tests that have been 14136 * done above) 14137 */ 14138 14139 boolean drawTop = false; 14140 boolean drawBottom = false; 14141 boolean drawLeft = false; 14142 boolean drawRight = false; 14143 14144 float topFadeStrength = 0.0f; 14145 float bottomFadeStrength = 0.0f; 14146 float leftFadeStrength = 0.0f; 14147 float rightFadeStrength = 0.0f; 14148 14149 // Step 2, save the canvas' layers 14150 int paddingLeft = mPaddingLeft; 14151 14152 final boolean offsetRequired = isPaddingOffsetRequired(); 14153 if (offsetRequired) { 14154 paddingLeft += getLeftPaddingOffset(); 14155 } 14156 14157 int left = mScrollX + paddingLeft; 14158 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 14159 int top = mScrollY + getFadeTop(offsetRequired); 14160 int bottom = top + getFadeHeight(offsetRequired); 14161 14162 if (offsetRequired) { 14163 right += getRightPaddingOffset(); 14164 bottom += getBottomPaddingOffset(); 14165 } 14166 14167 final ScrollabilityCache scrollabilityCache = mScrollCache; 14168 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 14169 int length = (int) fadeHeight; 14170 14171 // clip the fade length if top and bottom fades overlap 14172 // overlapping fades produce odd-looking artifacts 14173 if (verticalEdges && (top + length > bottom - length)) { 14174 length = (bottom - top) / 2; 14175 } 14176 14177 // also clip horizontal fades if necessary 14178 if (horizontalEdges && (left + length > right - length)) { 14179 length = (right - left) / 2; 14180 } 14181 14182 if (verticalEdges) { 14183 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 14184 drawTop = topFadeStrength * fadeHeight > 1.0f; 14185 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 14186 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 14187 } 14188 14189 if (horizontalEdges) { 14190 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 14191 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 14192 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 14193 drawRight = rightFadeStrength * fadeHeight > 1.0f; 14194 } 14195 14196 saveCount = canvas.getSaveCount(); 14197 14198 int solidColor = getSolidColor(); 14199 if (solidColor == 0) { 14200 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 14201 14202 if (drawTop) { 14203 canvas.saveLayer(left, top, right, top + length, null, flags); 14204 } 14205 14206 if (drawBottom) { 14207 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 14208 } 14209 14210 if (drawLeft) { 14211 canvas.saveLayer(left, top, left + length, bottom, null, flags); 14212 } 14213 14214 if (drawRight) { 14215 canvas.saveLayer(right - length, top, right, bottom, null, flags); 14216 } 14217 } else { 14218 scrollabilityCache.setFadeColor(solidColor); 14219 } 14220 14221 // Step 3, draw the content 14222 if (!dirtyOpaque) onDraw(canvas); 14223 14224 // Step 4, draw the children 14225 dispatchDraw(canvas); 14226 14227 // Step 5, draw the fade effect and restore layers 14228 final Paint p = scrollabilityCache.paint; 14229 final Matrix matrix = scrollabilityCache.matrix; 14230 final Shader fade = scrollabilityCache.shader; 14231 14232 if (drawTop) { 14233 matrix.setScale(1, fadeHeight * topFadeStrength); 14234 matrix.postTranslate(left, top); 14235 fade.setLocalMatrix(matrix); 14236 canvas.drawRect(left, top, right, top + length, p); 14237 } 14238 14239 if (drawBottom) { 14240 matrix.setScale(1, fadeHeight * bottomFadeStrength); 14241 matrix.postRotate(180); 14242 matrix.postTranslate(left, bottom); 14243 fade.setLocalMatrix(matrix); 14244 canvas.drawRect(left, bottom - length, right, bottom, p); 14245 } 14246 14247 if (drawLeft) { 14248 matrix.setScale(1, fadeHeight * leftFadeStrength); 14249 matrix.postRotate(-90); 14250 matrix.postTranslate(left, top); 14251 fade.setLocalMatrix(matrix); 14252 canvas.drawRect(left, top, left + length, bottom, p); 14253 } 14254 14255 if (drawRight) { 14256 matrix.setScale(1, fadeHeight * rightFadeStrength); 14257 matrix.postRotate(90); 14258 matrix.postTranslate(right, top); 14259 fade.setLocalMatrix(matrix); 14260 canvas.drawRect(right - length, top, right, bottom, p); 14261 } 14262 14263 canvas.restoreToCount(saveCount); 14264 14265 // Step 6, draw decorations (scrollbars) 14266 onDrawScrollBars(canvas); 14267 14268 if (mOverlay != null && !mOverlay.isEmpty()) { 14269 mOverlay.getOverlayView().dispatchDraw(canvas); 14270 } 14271 } 14272 14273 /** 14274 * Returns the overlay for this view, creating it if it does not yet exist. 14275 * Adding drawables to the overlay will cause them to be displayed whenever 14276 * the view itself is redrawn. Objects in the overlay should be actively 14277 * managed: remove them when they should not be displayed anymore. The 14278 * overlay will always have the same size as its host view. 14279 * 14280 * <p>Note: Overlays do not currently work correctly with {@link 14281 * SurfaceView} or {@link TextureView}; contents in overlays for these 14282 * types of views may not display correctly.</p> 14283 * 14284 * @return The ViewOverlay object for this view. 14285 * @see ViewOverlay 14286 */ 14287 public ViewOverlay getOverlay() { 14288 if (mOverlay == null) { 14289 mOverlay = new ViewOverlay(mContext, this); 14290 } 14291 return mOverlay; 14292 } 14293 14294 /** 14295 * Override this if your view is known to always be drawn on top of a solid color background, 14296 * and needs to draw fading edges. Returning a non-zero color enables the view system to 14297 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 14298 * should be set to 0xFF. 14299 * 14300 * @see #setVerticalFadingEdgeEnabled(boolean) 14301 * @see #setHorizontalFadingEdgeEnabled(boolean) 14302 * 14303 * @return The known solid color background for this view, or 0 if the color may vary 14304 */ 14305 @ViewDebug.ExportedProperty(category = "drawing") 14306 public int getSolidColor() { 14307 return 0; 14308 } 14309 14310 /** 14311 * Build a human readable string representation of the specified view flags. 14312 * 14313 * @param flags the view flags to convert to a string 14314 * @return a String representing the supplied flags 14315 */ 14316 private static String printFlags(int flags) { 14317 String output = ""; 14318 int numFlags = 0; 14319 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 14320 output += "TAKES_FOCUS"; 14321 numFlags++; 14322 } 14323 14324 switch (flags & VISIBILITY_MASK) { 14325 case INVISIBLE: 14326 if (numFlags > 0) { 14327 output += " "; 14328 } 14329 output += "INVISIBLE"; 14330 // USELESS HERE numFlags++; 14331 break; 14332 case GONE: 14333 if (numFlags > 0) { 14334 output += " "; 14335 } 14336 output += "GONE"; 14337 // USELESS HERE numFlags++; 14338 break; 14339 default: 14340 break; 14341 } 14342 return output; 14343 } 14344 14345 /** 14346 * Build a human readable string representation of the specified private 14347 * view flags. 14348 * 14349 * @param privateFlags the private view flags to convert to a string 14350 * @return a String representing the supplied flags 14351 */ 14352 private static String printPrivateFlags(int privateFlags) { 14353 String output = ""; 14354 int numFlags = 0; 14355 14356 if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) { 14357 output += "WANTS_FOCUS"; 14358 numFlags++; 14359 } 14360 14361 if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) { 14362 if (numFlags > 0) { 14363 output += " "; 14364 } 14365 output += "FOCUSED"; 14366 numFlags++; 14367 } 14368 14369 if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) { 14370 if (numFlags > 0) { 14371 output += " "; 14372 } 14373 output += "SELECTED"; 14374 numFlags++; 14375 } 14376 14377 if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) { 14378 if (numFlags > 0) { 14379 output += " "; 14380 } 14381 output += "IS_ROOT_NAMESPACE"; 14382 numFlags++; 14383 } 14384 14385 if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) { 14386 if (numFlags > 0) { 14387 output += " "; 14388 } 14389 output += "HAS_BOUNDS"; 14390 numFlags++; 14391 } 14392 14393 if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) { 14394 if (numFlags > 0) { 14395 output += " "; 14396 } 14397 output += "DRAWN"; 14398 // USELESS HERE numFlags++; 14399 } 14400 return output; 14401 } 14402 14403 /** 14404 * <p>Indicates whether or not this view's layout will be requested during 14405 * the next hierarchy layout pass.</p> 14406 * 14407 * @return true if the layout will be forced during next layout pass 14408 */ 14409 public boolean isLayoutRequested() { 14410 return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT; 14411 } 14412 14413 /** 14414 * Return true if o is a ViewGroup that is laying out using optical bounds. 14415 * @hide 14416 */ 14417 public static boolean isLayoutModeOptical(Object o) { 14418 return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical(); 14419 } 14420 14421 private boolean setOpticalFrame(int left, int top, int right, int bottom) { 14422 Insets parentInsets = mParent instanceof View ? 14423 ((View) mParent).getOpticalInsets() : Insets.NONE; 14424 Insets childInsets = getOpticalInsets(); 14425 return setFrame( 14426 left + parentInsets.left - childInsets.left, 14427 top + parentInsets.top - childInsets.top, 14428 right + parentInsets.left + childInsets.right, 14429 bottom + parentInsets.top + childInsets.bottom); 14430 } 14431 14432 /** 14433 * Assign a size and position to a view and all of its 14434 * descendants 14435 * 14436 * <p>This is the second phase of the layout mechanism. 14437 * (The first is measuring). In this phase, each parent calls 14438 * layout on all of its children to position them. 14439 * This is typically done using the child measurements 14440 * that were stored in the measure pass().</p> 14441 * 14442 * <p>Derived classes should not override this method. 14443 * Derived classes with children should override 14444 * onLayout. In that method, they should 14445 * call layout on each of their children.</p> 14446 * 14447 * @param l Left position, relative to parent 14448 * @param t Top position, relative to parent 14449 * @param r Right position, relative to parent 14450 * @param b Bottom position, relative to parent 14451 */ 14452 @SuppressWarnings({"unchecked"}) 14453 public void layout(int l, int t, int r, int b) { 14454 if ((mPrivateFlags3 & PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT) != 0) { 14455 onMeasure(mOldWidthMeasureSpec, mOldHeightMeasureSpec); 14456 mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 14457 } 14458 14459 int oldL = mLeft; 14460 int oldT = mTop; 14461 int oldB = mBottom; 14462 int oldR = mRight; 14463 14464 boolean changed = isLayoutModeOptical(mParent) ? 14465 setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b); 14466 14467 if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) { 14468 onLayout(changed, l, t, r, b); 14469 mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED; 14470 14471 ListenerInfo li = mListenerInfo; 14472 if (li != null && li.mOnLayoutChangeListeners != null) { 14473 ArrayList<OnLayoutChangeListener> listenersCopy = 14474 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 14475 int numListeners = listenersCopy.size(); 14476 for (int i = 0; i < numListeners; ++i) { 14477 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 14478 } 14479 } 14480 } 14481 14482 mPrivateFlags &= ~PFLAG_FORCE_LAYOUT; 14483 mPrivateFlags3 |= PFLAG3_IS_LAID_OUT; 14484 } 14485 14486 /** 14487 * Called from layout when this view should 14488 * assign a size and position to each of its children. 14489 * 14490 * Derived classes with children should override 14491 * this method and call layout on each of 14492 * their children. 14493 * @param changed This is a new size or position for this view 14494 * @param left Left position, relative to parent 14495 * @param top Top position, relative to parent 14496 * @param right Right position, relative to parent 14497 * @param bottom Bottom position, relative to parent 14498 */ 14499 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 14500 } 14501 14502 /** 14503 * Assign a size and position to this view. 14504 * 14505 * This is called from layout. 14506 * 14507 * @param left Left position, relative to parent 14508 * @param top Top position, relative to parent 14509 * @param right Right position, relative to parent 14510 * @param bottom Bottom position, relative to parent 14511 * @return true if the new size and position are different than the 14512 * previous ones 14513 * {@hide} 14514 */ 14515 protected boolean setFrame(int left, int top, int right, int bottom) { 14516 boolean changed = false; 14517 14518 if (DBG) { 14519 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 14520 + right + "," + bottom + ")"); 14521 } 14522 14523 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 14524 changed = true; 14525 14526 // Remember our drawn bit 14527 int drawn = mPrivateFlags & PFLAG_DRAWN; 14528 14529 int oldWidth = mRight - mLeft; 14530 int oldHeight = mBottom - mTop; 14531 int newWidth = right - left; 14532 int newHeight = bottom - top; 14533 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 14534 14535 // Invalidate our old position 14536 invalidate(sizeChanged); 14537 14538 mLeft = left; 14539 mTop = top; 14540 mRight = right; 14541 mBottom = bottom; 14542 if (mDisplayList != null) { 14543 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 14544 } 14545 14546 mPrivateFlags |= PFLAG_HAS_BOUNDS; 14547 14548 14549 if (sizeChanged) { 14550 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 14551 // A change in dimension means an auto-centered pivot point changes, too 14552 if (mTransformationInfo != null) { 14553 mTransformationInfo.mMatrixDirty = true; 14554 } 14555 } 14556 sizeChange(newWidth, newHeight, oldWidth, oldHeight); 14557 } 14558 14559 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 14560 // If we are visible, force the DRAWN bit to on so that 14561 // this invalidate will go through (at least to our parent). 14562 // This is because someone may have invalidated this view 14563 // before this call to setFrame came in, thereby clearing 14564 // the DRAWN bit. 14565 mPrivateFlags |= PFLAG_DRAWN; 14566 invalidate(sizeChanged); 14567 // parent display list may need to be recreated based on a change in the bounds 14568 // of any child 14569 invalidateParentCaches(); 14570 } 14571 14572 // Reset drawn bit to original value (invalidate turns it off) 14573 mPrivateFlags |= drawn; 14574 14575 mBackgroundSizeChanged = true; 14576 14577 notifySubtreeAccessibilityStateChangedIfNeeded(); 14578 } 14579 return changed; 14580 } 14581 14582 private void sizeChange(int newWidth, int newHeight, int oldWidth, int oldHeight) { 14583 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 14584 if (mOverlay != null) { 14585 mOverlay.getOverlayView().setRight(newWidth); 14586 mOverlay.getOverlayView().setBottom(newHeight); 14587 } 14588 } 14589 14590 /** 14591 * Finalize inflating a view from XML. This is called as the last phase 14592 * of inflation, after all child views have been added. 14593 * 14594 * <p>Even if the subclass overrides onFinishInflate, they should always be 14595 * sure to call the super method, so that we get called. 14596 */ 14597 protected void onFinishInflate() { 14598 } 14599 14600 /** 14601 * Returns the resources associated with this view. 14602 * 14603 * @return Resources object. 14604 */ 14605 public Resources getResources() { 14606 return mResources; 14607 } 14608 14609 /** 14610 * Invalidates the specified Drawable. 14611 * 14612 * @param drawable the drawable to invalidate 14613 */ 14614 public void invalidateDrawable(Drawable drawable) { 14615 if (verifyDrawable(drawable)) { 14616 final Rect dirty = drawable.getBounds(); 14617 final int scrollX = mScrollX; 14618 final int scrollY = mScrollY; 14619 14620 invalidate(dirty.left + scrollX, dirty.top + scrollY, 14621 dirty.right + scrollX, dirty.bottom + scrollY); 14622 } 14623 } 14624 14625 /** 14626 * Schedules an action on a drawable to occur at a specified time. 14627 * 14628 * @param who the recipient of the action 14629 * @param what the action to run on the drawable 14630 * @param when the time at which the action must occur. Uses the 14631 * {@link SystemClock#uptimeMillis} timebase. 14632 */ 14633 public void scheduleDrawable(Drawable who, Runnable what, long when) { 14634 if (verifyDrawable(who) && what != null) { 14635 final long delay = when - SystemClock.uptimeMillis(); 14636 if (mAttachInfo != null) { 14637 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 14638 Choreographer.CALLBACK_ANIMATION, what, who, 14639 Choreographer.subtractFrameDelay(delay)); 14640 } else { 14641 ViewRootImpl.getRunQueue().postDelayed(what, delay); 14642 } 14643 } 14644 } 14645 14646 /** 14647 * Cancels a scheduled action on a drawable. 14648 * 14649 * @param who the recipient of the action 14650 * @param what the action to cancel 14651 */ 14652 public void unscheduleDrawable(Drawable who, Runnable what) { 14653 if (verifyDrawable(who) && what != null) { 14654 if (mAttachInfo != null) { 14655 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14656 Choreographer.CALLBACK_ANIMATION, what, who); 14657 } else { 14658 ViewRootImpl.getRunQueue().removeCallbacks(what); 14659 } 14660 } 14661 } 14662 14663 /** 14664 * Unschedule any events associated with the given Drawable. This can be 14665 * used when selecting a new Drawable into a view, so that the previous 14666 * one is completely unscheduled. 14667 * 14668 * @param who The Drawable to unschedule. 14669 * 14670 * @see #drawableStateChanged 14671 */ 14672 public void unscheduleDrawable(Drawable who) { 14673 if (mAttachInfo != null && who != null) { 14674 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14675 Choreographer.CALLBACK_ANIMATION, null, who); 14676 } 14677 } 14678 14679 /** 14680 * Resolve the Drawables depending on the layout direction. This is implicitly supposing 14681 * that the View directionality can and will be resolved before its Drawables. 14682 * 14683 * Will call {@link View#onResolveDrawables} when resolution is done. 14684 * 14685 * @hide 14686 */ 14687 protected void resolveDrawables() { 14688 // Drawables resolution may need to happen before resolving the layout direction (which is 14689 // done only during the measure() call). 14690 // If the layout direction is not resolved yet, we cannot resolve the Drawables except in 14691 // one case: when the raw layout direction has not been defined as LAYOUT_DIRECTION_INHERIT. 14692 // So, if the raw layout direction is LAYOUT_DIRECTION_LTR or LAYOUT_DIRECTION_RTL or 14693 // LAYOUT_DIRECTION_LOCALE, we can "cheat" and we don't need to wait for the layout 14694 // direction to be resolved as its resolved value will be the same as its raw value. 14695 if (!isLayoutDirectionResolved() && 14696 getRawLayoutDirection() == View.LAYOUT_DIRECTION_INHERIT) { 14697 return; 14698 } 14699 14700 final int layoutDirection = isLayoutDirectionResolved() ? 14701 getLayoutDirection() : getRawLayoutDirection(); 14702 14703 if (mBackground != null) { 14704 mBackground.setLayoutDirection(layoutDirection); 14705 } 14706 mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED; 14707 onResolveDrawables(layoutDirection); 14708 } 14709 14710 /** 14711 * Called when layout direction has been resolved. 14712 * 14713 * The default implementation does nothing. 14714 * 14715 * @param layoutDirection The resolved layout direction. 14716 * 14717 * @see #LAYOUT_DIRECTION_LTR 14718 * @see #LAYOUT_DIRECTION_RTL 14719 * 14720 * @hide 14721 */ 14722 public void onResolveDrawables(int layoutDirection) { 14723 } 14724 14725 /** 14726 * @hide 14727 */ 14728 protected void resetResolvedDrawables() { 14729 mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED; 14730 } 14731 14732 private boolean isDrawablesResolved() { 14733 return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED; 14734 } 14735 14736 /** 14737 * If your view subclass is displaying its own Drawable objects, it should 14738 * override this function and return true for any Drawable it is 14739 * displaying. This allows animations for those drawables to be 14740 * scheduled. 14741 * 14742 * <p>Be sure to call through to the super class when overriding this 14743 * function. 14744 * 14745 * @param who The Drawable to verify. Return true if it is one you are 14746 * displaying, else return the result of calling through to the 14747 * super class. 14748 * 14749 * @return boolean If true than the Drawable is being displayed in the 14750 * view; else false and it is not allowed to animate. 14751 * 14752 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 14753 * @see #drawableStateChanged() 14754 */ 14755 protected boolean verifyDrawable(Drawable who) { 14756 return who == mBackground; 14757 } 14758 14759 /** 14760 * This function is called whenever the state of the view changes in such 14761 * a way that it impacts the state of drawables being shown. 14762 * 14763 * <p>Be sure to call through to the superclass when overriding this 14764 * function. 14765 * 14766 * @see Drawable#setState(int[]) 14767 */ 14768 protected void drawableStateChanged() { 14769 Drawable d = mBackground; 14770 if (d != null && d.isStateful()) { 14771 d.setState(getDrawableState()); 14772 } 14773 } 14774 14775 /** 14776 * Call this to force a view to update its drawable state. This will cause 14777 * drawableStateChanged to be called on this view. Views that are interested 14778 * in the new state should call getDrawableState. 14779 * 14780 * @see #drawableStateChanged 14781 * @see #getDrawableState 14782 */ 14783 public void refreshDrawableState() { 14784 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 14785 drawableStateChanged(); 14786 14787 ViewParent parent = mParent; 14788 if (parent != null) { 14789 parent.childDrawableStateChanged(this); 14790 } 14791 } 14792 14793 /** 14794 * Return an array of resource IDs of the drawable states representing the 14795 * current state of the view. 14796 * 14797 * @return The current drawable state 14798 * 14799 * @see Drawable#setState(int[]) 14800 * @see #drawableStateChanged() 14801 * @see #onCreateDrawableState(int) 14802 */ 14803 public final int[] getDrawableState() { 14804 if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) { 14805 return mDrawableState; 14806 } else { 14807 mDrawableState = onCreateDrawableState(0); 14808 mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY; 14809 return mDrawableState; 14810 } 14811 } 14812 14813 /** 14814 * Generate the new {@link android.graphics.drawable.Drawable} state for 14815 * this view. This is called by the view 14816 * system when the cached Drawable state is determined to be invalid. To 14817 * retrieve the current state, you should use {@link #getDrawableState}. 14818 * 14819 * @param extraSpace if non-zero, this is the number of extra entries you 14820 * would like in the returned array in which you can place your own 14821 * states. 14822 * 14823 * @return Returns an array holding the current {@link Drawable} state of 14824 * the view. 14825 * 14826 * @see #mergeDrawableStates(int[], int[]) 14827 */ 14828 protected int[] onCreateDrawableState(int extraSpace) { 14829 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 14830 mParent instanceof View) { 14831 return ((View) mParent).onCreateDrawableState(extraSpace); 14832 } 14833 14834 int[] drawableState; 14835 14836 int privateFlags = mPrivateFlags; 14837 14838 int viewStateIndex = 0; 14839 if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 14840 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 14841 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 14842 if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 14843 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 14844 if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 14845 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 14846 HardwareRenderer.isAvailable()) { 14847 // This is set if HW acceleration is requested, even if the current 14848 // process doesn't allow it. This is just to allow app preview 14849 // windows to better match their app. 14850 viewStateIndex |= VIEW_STATE_ACCELERATED; 14851 } 14852 if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 14853 14854 final int privateFlags2 = mPrivateFlags2; 14855 if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 14856 if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 14857 14858 drawableState = VIEW_STATE_SETS[viewStateIndex]; 14859 14860 //noinspection ConstantIfStatement 14861 if (false) { 14862 Log.i("View", "drawableStateIndex=" + viewStateIndex); 14863 Log.i("View", toString() 14864 + " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0) 14865 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 14866 + " fo=" + hasFocus() 14867 + " sl=" + ((privateFlags & PFLAG_SELECTED) != 0) 14868 + " wf=" + hasWindowFocus() 14869 + ": " + Arrays.toString(drawableState)); 14870 } 14871 14872 if (extraSpace == 0) { 14873 return drawableState; 14874 } 14875 14876 final int[] fullState; 14877 if (drawableState != null) { 14878 fullState = new int[drawableState.length + extraSpace]; 14879 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 14880 } else { 14881 fullState = new int[extraSpace]; 14882 } 14883 14884 return fullState; 14885 } 14886 14887 /** 14888 * Merge your own state values in <var>additionalState</var> into the base 14889 * state values <var>baseState</var> that were returned by 14890 * {@link #onCreateDrawableState(int)}. 14891 * 14892 * @param baseState The base state values returned by 14893 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 14894 * own additional state values. 14895 * 14896 * @param additionalState The additional state values you would like 14897 * added to <var>baseState</var>; this array is not modified. 14898 * 14899 * @return As a convenience, the <var>baseState</var> array you originally 14900 * passed into the function is returned. 14901 * 14902 * @see #onCreateDrawableState(int) 14903 */ 14904 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 14905 final int N = baseState.length; 14906 int i = N - 1; 14907 while (i >= 0 && baseState[i] == 0) { 14908 i--; 14909 } 14910 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 14911 return baseState; 14912 } 14913 14914 /** 14915 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 14916 * on all Drawable objects associated with this view. 14917 */ 14918 public void jumpDrawablesToCurrentState() { 14919 if (mBackground != null) { 14920 mBackground.jumpToCurrentState(); 14921 } 14922 } 14923 14924 /** 14925 * Sets the background color for this view. 14926 * @param color the color of the background 14927 */ 14928 @RemotableViewMethod 14929 public void setBackgroundColor(int color) { 14930 if (mBackground instanceof ColorDrawable) { 14931 ((ColorDrawable) mBackground.mutate()).setColor(color); 14932 computeOpaqueFlags(); 14933 mBackgroundResource = 0; 14934 } else { 14935 setBackground(new ColorDrawable(color)); 14936 } 14937 } 14938 14939 /** 14940 * Set the background to a given resource. The resource should refer to 14941 * a Drawable object or 0 to remove the background. 14942 * @param resid The identifier of the resource. 14943 * 14944 * @attr ref android.R.styleable#View_background 14945 */ 14946 @RemotableViewMethod 14947 public void setBackgroundResource(int resid) { 14948 if (resid != 0 && resid == mBackgroundResource) { 14949 return; 14950 } 14951 14952 Drawable d= null; 14953 if (resid != 0) { 14954 d = mResources.getDrawable(resid); 14955 } 14956 setBackground(d); 14957 14958 mBackgroundResource = resid; 14959 } 14960 14961 /** 14962 * Set the background to a given Drawable, or remove the background. If the 14963 * background has padding, this View's padding is set to the background's 14964 * padding. However, when a background is removed, this View's padding isn't 14965 * touched. If setting the padding is desired, please use 14966 * {@link #setPadding(int, int, int, int)}. 14967 * 14968 * @param background The Drawable to use as the background, or null to remove the 14969 * background 14970 */ 14971 public void setBackground(Drawable background) { 14972 //noinspection deprecation 14973 setBackgroundDrawable(background); 14974 } 14975 14976 /** 14977 * @deprecated use {@link #setBackground(Drawable)} instead 14978 */ 14979 @Deprecated 14980 public void setBackgroundDrawable(Drawable background) { 14981 computeOpaqueFlags(); 14982 14983 if (background == mBackground) { 14984 return; 14985 } 14986 14987 boolean requestLayout = false; 14988 14989 mBackgroundResource = 0; 14990 14991 /* 14992 * Regardless of whether we're setting a new background or not, we want 14993 * to clear the previous drawable. 14994 */ 14995 if (mBackground != null) { 14996 mBackground.setCallback(null); 14997 unscheduleDrawable(mBackground); 14998 } 14999 15000 if (background != null) { 15001 Rect padding = sThreadLocal.get(); 15002 if (padding == null) { 15003 padding = new Rect(); 15004 sThreadLocal.set(padding); 15005 } 15006 resetResolvedDrawables(); 15007 background.setLayoutDirection(getLayoutDirection()); 15008 if (background.getPadding(padding)) { 15009 resetResolvedPadding(); 15010 switch (background.getLayoutDirection()) { 15011 case LAYOUT_DIRECTION_RTL: 15012 mUserPaddingLeftInitial = padding.right; 15013 mUserPaddingRightInitial = padding.left; 15014 internalSetPadding(padding.right, padding.top, padding.left, padding.bottom); 15015 break; 15016 case LAYOUT_DIRECTION_LTR: 15017 default: 15018 mUserPaddingLeftInitial = padding.left; 15019 mUserPaddingRightInitial = padding.right; 15020 internalSetPadding(padding.left, padding.top, padding.right, padding.bottom); 15021 } 15022 } 15023 15024 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 15025 // if it has a different minimum size, we should layout again 15026 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 15027 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 15028 requestLayout = true; 15029 } 15030 15031 background.setCallback(this); 15032 if (background.isStateful()) { 15033 background.setState(getDrawableState()); 15034 } 15035 background.setVisible(getVisibility() == VISIBLE, false); 15036 mBackground = background; 15037 15038 if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) { 15039 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 15040 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 15041 requestLayout = true; 15042 } 15043 } else { 15044 /* Remove the background */ 15045 mBackground = null; 15046 15047 if ((mPrivateFlags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0) { 15048 /* 15049 * This view ONLY drew the background before and we're removing 15050 * the background, so now it won't draw anything 15051 * (hence we SKIP_DRAW) 15052 */ 15053 mPrivateFlags &= ~PFLAG_ONLY_DRAWS_BACKGROUND; 15054 mPrivateFlags |= PFLAG_SKIP_DRAW; 15055 } 15056 15057 /* 15058 * When the background is set, we try to apply its padding to this 15059 * View. When the background is removed, we don't touch this View's 15060 * padding. This is noted in the Javadocs. Hence, we don't need to 15061 * requestLayout(), the invalidate() below is sufficient. 15062 */ 15063 15064 // The old background's minimum size could have affected this 15065 // View's layout, so let's requestLayout 15066 requestLayout = true; 15067 } 15068 15069 computeOpaqueFlags(); 15070 15071 if (requestLayout) { 15072 requestLayout(); 15073 } 15074 15075 mBackgroundSizeChanged = true; 15076 invalidate(true); 15077 } 15078 15079 /** 15080 * Gets the background drawable 15081 * 15082 * @return The drawable used as the background for this view, if any. 15083 * 15084 * @see #setBackground(Drawable) 15085 * 15086 * @attr ref android.R.styleable#View_background 15087 */ 15088 public Drawable getBackground() { 15089 return mBackground; 15090 } 15091 15092 /** 15093 * Sets the padding. The view may add on the space required to display 15094 * the scrollbars, depending on the style and visibility of the scrollbars. 15095 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 15096 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 15097 * from the values set in this call. 15098 * 15099 * @attr ref android.R.styleable#View_padding 15100 * @attr ref android.R.styleable#View_paddingBottom 15101 * @attr ref android.R.styleable#View_paddingLeft 15102 * @attr ref android.R.styleable#View_paddingRight 15103 * @attr ref android.R.styleable#View_paddingTop 15104 * @param left the left padding in pixels 15105 * @param top the top padding in pixels 15106 * @param right the right padding in pixels 15107 * @param bottom the bottom padding in pixels 15108 */ 15109 public void setPadding(int left, int top, int right, int bottom) { 15110 resetResolvedPadding(); 15111 15112 mUserPaddingStart = UNDEFINED_PADDING; 15113 mUserPaddingEnd = UNDEFINED_PADDING; 15114 15115 mUserPaddingLeftInitial = left; 15116 mUserPaddingRightInitial = right; 15117 15118 internalSetPadding(left, top, right, bottom); 15119 } 15120 15121 /** 15122 * @hide 15123 */ 15124 protected void internalSetPadding(int left, int top, int right, int bottom) { 15125 mUserPaddingLeft = left; 15126 mUserPaddingRight = right; 15127 mUserPaddingBottom = bottom; 15128 15129 final int viewFlags = mViewFlags; 15130 boolean changed = false; 15131 15132 // Common case is there are no scroll bars. 15133 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 15134 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 15135 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 15136 ? 0 : getVerticalScrollbarWidth(); 15137 switch (mVerticalScrollbarPosition) { 15138 case SCROLLBAR_POSITION_DEFAULT: 15139 if (isLayoutRtl()) { 15140 left += offset; 15141 } else { 15142 right += offset; 15143 } 15144 break; 15145 case SCROLLBAR_POSITION_RIGHT: 15146 right += offset; 15147 break; 15148 case SCROLLBAR_POSITION_LEFT: 15149 left += offset; 15150 break; 15151 } 15152 } 15153 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 15154 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 15155 ? 0 : getHorizontalScrollbarHeight(); 15156 } 15157 } 15158 15159 if (mPaddingLeft != left) { 15160 changed = true; 15161 mPaddingLeft = left; 15162 } 15163 if (mPaddingTop != top) { 15164 changed = true; 15165 mPaddingTop = top; 15166 } 15167 if (mPaddingRight != right) { 15168 changed = true; 15169 mPaddingRight = right; 15170 } 15171 if (mPaddingBottom != bottom) { 15172 changed = true; 15173 mPaddingBottom = bottom; 15174 } 15175 15176 if (changed) { 15177 requestLayout(); 15178 } 15179 } 15180 15181 /** 15182 * Sets the relative padding. The view may add on the space required to display 15183 * the scrollbars, depending on the style and visibility of the scrollbars. 15184 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 15185 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 15186 * from the values set in this call. 15187 * 15188 * @attr ref android.R.styleable#View_padding 15189 * @attr ref android.R.styleable#View_paddingBottom 15190 * @attr ref android.R.styleable#View_paddingStart 15191 * @attr ref android.R.styleable#View_paddingEnd 15192 * @attr ref android.R.styleable#View_paddingTop 15193 * @param start the start padding in pixels 15194 * @param top the top padding in pixels 15195 * @param end the end padding in pixels 15196 * @param bottom the bottom padding in pixels 15197 */ 15198 public void setPaddingRelative(int start, int top, int end, int bottom) { 15199 resetResolvedPadding(); 15200 15201 mUserPaddingStart = start; 15202 mUserPaddingEnd = end; 15203 15204 switch(getLayoutDirection()) { 15205 case LAYOUT_DIRECTION_RTL: 15206 mUserPaddingLeftInitial = end; 15207 mUserPaddingRightInitial = start; 15208 internalSetPadding(end, top, start, bottom); 15209 break; 15210 case LAYOUT_DIRECTION_LTR: 15211 default: 15212 mUserPaddingLeftInitial = start; 15213 mUserPaddingRightInitial = end; 15214 internalSetPadding(start, top, end, bottom); 15215 } 15216 } 15217 15218 /** 15219 * Returns the top padding of this view. 15220 * 15221 * @return the top padding in pixels 15222 */ 15223 public int getPaddingTop() { 15224 return mPaddingTop; 15225 } 15226 15227 /** 15228 * Returns the bottom padding of this view. If there are inset and enabled 15229 * scrollbars, this value may include the space required to display the 15230 * scrollbars as well. 15231 * 15232 * @return the bottom padding in pixels 15233 */ 15234 public int getPaddingBottom() { 15235 return mPaddingBottom; 15236 } 15237 15238 /** 15239 * Returns the left padding of this view. If there are inset and enabled 15240 * scrollbars, this value may include the space required to display the 15241 * scrollbars as well. 15242 * 15243 * @return the left padding in pixels 15244 */ 15245 public int getPaddingLeft() { 15246 if (!isPaddingResolved()) { 15247 resolvePadding(); 15248 } 15249 return mPaddingLeft; 15250 } 15251 15252 /** 15253 * Returns the start padding of this view depending on its resolved layout direction. 15254 * If there are inset and enabled scrollbars, this value may include the space 15255 * required to display the scrollbars as well. 15256 * 15257 * @return the start padding in pixels 15258 */ 15259 public int getPaddingStart() { 15260 if (!isPaddingResolved()) { 15261 resolvePadding(); 15262 } 15263 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15264 mPaddingRight : mPaddingLeft; 15265 } 15266 15267 /** 15268 * Returns the right padding of this view. If there are inset and enabled 15269 * scrollbars, this value may include the space required to display the 15270 * scrollbars as well. 15271 * 15272 * @return the right padding in pixels 15273 */ 15274 public int getPaddingRight() { 15275 if (!isPaddingResolved()) { 15276 resolvePadding(); 15277 } 15278 return mPaddingRight; 15279 } 15280 15281 /** 15282 * Returns the end padding of this view depending on its resolved layout direction. 15283 * If there are inset and enabled scrollbars, this value may include the space 15284 * required to display the scrollbars as well. 15285 * 15286 * @return the end padding in pixels 15287 */ 15288 public int getPaddingEnd() { 15289 if (!isPaddingResolved()) { 15290 resolvePadding(); 15291 } 15292 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15293 mPaddingLeft : mPaddingRight; 15294 } 15295 15296 /** 15297 * Return if the padding as been set thru relative values 15298 * {@link #setPaddingRelative(int, int, int, int)} or thru 15299 * @attr ref android.R.styleable#View_paddingStart or 15300 * @attr ref android.R.styleable#View_paddingEnd 15301 * 15302 * @return true if the padding is relative or false if it is not. 15303 */ 15304 public boolean isPaddingRelative() { 15305 return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING); 15306 } 15307 15308 Insets computeOpticalInsets() { 15309 return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets(); 15310 } 15311 15312 /** 15313 * @hide 15314 */ 15315 public void resetPaddingToInitialValues() { 15316 if (isRtlCompatibilityMode()) { 15317 mPaddingLeft = mUserPaddingLeftInitial; 15318 mPaddingRight = mUserPaddingRightInitial; 15319 return; 15320 } 15321 if (isLayoutRtl()) { 15322 mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial; 15323 mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial; 15324 } else { 15325 mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial; 15326 mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial; 15327 } 15328 } 15329 15330 /** 15331 * @hide 15332 */ 15333 public Insets getOpticalInsets() { 15334 if (mLayoutInsets == null) { 15335 mLayoutInsets = computeOpticalInsets(); 15336 } 15337 return mLayoutInsets; 15338 } 15339 15340 /** 15341 * Changes the selection state of this view. A view can be selected or not. 15342 * Note that selection is not the same as focus. Views are typically 15343 * selected in the context of an AdapterView like ListView or GridView; 15344 * the selected view is the view that is highlighted. 15345 * 15346 * @param selected true if the view must be selected, false otherwise 15347 */ 15348 public void setSelected(boolean selected) { 15349 //noinspection DoubleNegation 15350 if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) { 15351 mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0); 15352 if (!selected) resetPressedState(); 15353 invalidate(true); 15354 refreshDrawableState(); 15355 dispatchSetSelected(selected); 15356 notifyViewAccessibilityStateChangedIfNeeded(); 15357 } 15358 } 15359 15360 /** 15361 * Dispatch setSelected to all of this View's children. 15362 * 15363 * @see #setSelected(boolean) 15364 * 15365 * @param selected The new selected state 15366 */ 15367 protected void dispatchSetSelected(boolean selected) { 15368 } 15369 15370 /** 15371 * Indicates the selection state of this view. 15372 * 15373 * @return true if the view is selected, false otherwise 15374 */ 15375 @ViewDebug.ExportedProperty 15376 public boolean isSelected() { 15377 return (mPrivateFlags & PFLAG_SELECTED) != 0; 15378 } 15379 15380 /** 15381 * Changes the activated state of this view. A view can be activated or not. 15382 * Note that activation is not the same as selection. Selection is 15383 * a transient property, representing the view (hierarchy) the user is 15384 * currently interacting with. Activation is a longer-term state that the 15385 * user can move views in and out of. For example, in a list view with 15386 * single or multiple selection enabled, the views in the current selection 15387 * set are activated. (Um, yeah, we are deeply sorry about the terminology 15388 * here.) The activated state is propagated down to children of the view it 15389 * is set on. 15390 * 15391 * @param activated true if the view must be activated, false otherwise 15392 */ 15393 public void setActivated(boolean activated) { 15394 //noinspection DoubleNegation 15395 if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) { 15396 mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0); 15397 invalidate(true); 15398 refreshDrawableState(); 15399 dispatchSetActivated(activated); 15400 } 15401 } 15402 15403 /** 15404 * Dispatch setActivated to all of this View's children. 15405 * 15406 * @see #setActivated(boolean) 15407 * 15408 * @param activated The new activated state 15409 */ 15410 protected void dispatchSetActivated(boolean activated) { 15411 } 15412 15413 /** 15414 * Indicates the activation state of this view. 15415 * 15416 * @return true if the view is activated, false otherwise 15417 */ 15418 @ViewDebug.ExportedProperty 15419 public boolean isActivated() { 15420 return (mPrivateFlags & PFLAG_ACTIVATED) != 0; 15421 } 15422 15423 /** 15424 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 15425 * observer can be used to get notifications when global events, like 15426 * layout, happen. 15427 * 15428 * The returned ViewTreeObserver observer is not guaranteed to remain 15429 * valid for the lifetime of this View. If the caller of this method keeps 15430 * a long-lived reference to ViewTreeObserver, it should always check for 15431 * the return value of {@link ViewTreeObserver#isAlive()}. 15432 * 15433 * @return The ViewTreeObserver for this view's hierarchy. 15434 */ 15435 public ViewTreeObserver getViewTreeObserver() { 15436 if (mAttachInfo != null) { 15437 return mAttachInfo.mTreeObserver; 15438 } 15439 if (mFloatingTreeObserver == null) { 15440 mFloatingTreeObserver = new ViewTreeObserver(); 15441 } 15442 return mFloatingTreeObserver; 15443 } 15444 15445 /** 15446 * <p>Finds the topmost view in the current view hierarchy.</p> 15447 * 15448 * @return the topmost view containing this view 15449 */ 15450 public View getRootView() { 15451 if (mAttachInfo != null) { 15452 final View v = mAttachInfo.mRootView; 15453 if (v != null) { 15454 return v; 15455 } 15456 } 15457 15458 View parent = this; 15459 15460 while (parent.mParent != null && parent.mParent instanceof View) { 15461 parent = (View) parent.mParent; 15462 } 15463 15464 return parent; 15465 } 15466 15467 /** 15468 * Transforms a motion event from view-local coordinates to on-screen 15469 * coordinates. 15470 * 15471 * @param ev the view-local motion event 15472 * @return false if the transformation could not be applied 15473 * @hide 15474 */ 15475 public boolean toGlobalMotionEvent(MotionEvent ev) { 15476 final AttachInfo info = mAttachInfo; 15477 if (info == null) { 15478 return false; 15479 } 15480 15481 transformMotionEventToGlobal(ev); 15482 ev.offsetLocation(info.mWindowLeft, info.mWindowTop); 15483 return true; 15484 } 15485 15486 /** 15487 * Transforms a motion event from on-screen coordinates to view-local 15488 * coordinates. 15489 * 15490 * @param ev the on-screen motion event 15491 * @return false if the transformation could not be applied 15492 * @hide 15493 */ 15494 public boolean toLocalMotionEvent(MotionEvent ev) { 15495 final AttachInfo info = mAttachInfo; 15496 if (info == null) { 15497 return false; 15498 } 15499 15500 ev.offsetLocation(-info.mWindowLeft, -info.mWindowTop); 15501 transformMotionEventToLocal(ev); 15502 return true; 15503 } 15504 15505 /** 15506 * Recursive helper method that applies transformations in post-order. 15507 * 15508 * @param ev the on-screen motion event 15509 */ 15510 private void transformMotionEventToLocal(MotionEvent ev) { 15511 final ViewParent parent = mParent; 15512 if (parent instanceof View) { 15513 final View vp = (View) parent; 15514 vp.transformMotionEventToLocal(ev); 15515 ev.offsetLocation(vp.mScrollX, vp.mScrollY); 15516 } else if (parent instanceof ViewRootImpl) { 15517 final ViewRootImpl vr = (ViewRootImpl) parent; 15518 ev.offsetLocation(0, vr.mCurScrollY); 15519 } 15520 15521 ev.offsetLocation(-mLeft, -mTop); 15522 15523 if (!hasIdentityMatrix()) { 15524 ev.transform(getInverseMatrix()); 15525 } 15526 } 15527 15528 /** 15529 * Recursive helper method that applies transformations in pre-order. 15530 * 15531 * @param ev the on-screen motion event 15532 */ 15533 private void transformMotionEventToGlobal(MotionEvent ev) { 15534 if (!hasIdentityMatrix()) { 15535 ev.transform(getMatrix()); 15536 } 15537 15538 ev.offsetLocation(mLeft, mTop); 15539 15540 final ViewParent parent = mParent; 15541 if (parent instanceof View) { 15542 final View vp = (View) parent; 15543 ev.offsetLocation(-vp.mScrollX, -vp.mScrollY); 15544 vp.transformMotionEventToGlobal(ev); 15545 } else if (parent instanceof ViewRootImpl) { 15546 final ViewRootImpl vr = (ViewRootImpl) parent; 15547 ev.offsetLocation(0, -vr.mCurScrollY); 15548 } 15549 } 15550 15551 /** 15552 * <p>Computes the coordinates of this view on the screen. The argument 15553 * must be an array of two integers. After the method returns, the array 15554 * contains the x and y location in that order.</p> 15555 * 15556 * @param location an array of two integers in which to hold the coordinates 15557 */ 15558 public void getLocationOnScreen(int[] location) { 15559 getLocationInWindow(location); 15560 15561 final AttachInfo info = mAttachInfo; 15562 if (info != null) { 15563 location[0] += info.mWindowLeft; 15564 location[1] += info.mWindowTop; 15565 } 15566 } 15567 15568 /** 15569 * <p>Computes the coordinates of this view in its window. The argument 15570 * must be an array of two integers. After the method returns, the array 15571 * contains the x and y location in that order.</p> 15572 * 15573 * @param location an array of two integers in which to hold the coordinates 15574 */ 15575 public void getLocationInWindow(int[] location) { 15576 if (location == null || location.length < 2) { 15577 throw new IllegalArgumentException("location must be an array of two integers"); 15578 } 15579 15580 if (mAttachInfo == null) { 15581 // When the view is not attached to a window, this method does not make sense 15582 location[0] = location[1] = 0; 15583 return; 15584 } 15585 15586 float[] position = mAttachInfo.mTmpTransformLocation; 15587 position[0] = position[1] = 0.0f; 15588 15589 if (!hasIdentityMatrix()) { 15590 getMatrix().mapPoints(position); 15591 } 15592 15593 position[0] += mLeft; 15594 position[1] += mTop; 15595 15596 ViewParent viewParent = mParent; 15597 while (viewParent instanceof View) { 15598 final View view = (View) viewParent; 15599 15600 position[0] -= view.mScrollX; 15601 position[1] -= view.mScrollY; 15602 15603 if (!view.hasIdentityMatrix()) { 15604 view.getMatrix().mapPoints(position); 15605 } 15606 15607 position[0] += view.mLeft; 15608 position[1] += view.mTop; 15609 15610 viewParent = view.mParent; 15611 } 15612 15613 if (viewParent instanceof ViewRootImpl) { 15614 // *cough* 15615 final ViewRootImpl vr = (ViewRootImpl) viewParent; 15616 position[1] -= vr.mCurScrollY; 15617 } 15618 15619 location[0] = (int) (position[0] + 0.5f); 15620 location[1] = (int) (position[1] + 0.5f); 15621 } 15622 15623 /** 15624 * {@hide} 15625 * @param id the id of the view to be found 15626 * @return the view of the specified id, null if cannot be found 15627 */ 15628 protected View findViewTraversal(int id) { 15629 if (id == mID) { 15630 return this; 15631 } 15632 return null; 15633 } 15634 15635 /** 15636 * {@hide} 15637 * @param tag the tag of the view to be found 15638 * @return the view of specified tag, null if cannot be found 15639 */ 15640 protected View findViewWithTagTraversal(Object tag) { 15641 if (tag != null && tag.equals(mTag)) { 15642 return this; 15643 } 15644 return null; 15645 } 15646 15647 /** 15648 * {@hide} 15649 * @param predicate The predicate to evaluate. 15650 * @param childToSkip If not null, ignores this child during the recursive traversal. 15651 * @return The first view that matches the predicate or null. 15652 */ 15653 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 15654 if (predicate.apply(this)) { 15655 return this; 15656 } 15657 return null; 15658 } 15659 15660 /** 15661 * Look for a child view with the given id. If this view has the given 15662 * id, return this view. 15663 * 15664 * @param id The id to search for. 15665 * @return The view that has the given id in the hierarchy or null 15666 */ 15667 public final View findViewById(int id) { 15668 if (id < 0) { 15669 return null; 15670 } 15671 return findViewTraversal(id); 15672 } 15673 15674 /** 15675 * Finds a view by its unuque and stable accessibility id. 15676 * 15677 * @param accessibilityId The searched accessibility id. 15678 * @return The found view. 15679 */ 15680 final View findViewByAccessibilityId(int accessibilityId) { 15681 if (accessibilityId < 0) { 15682 return null; 15683 } 15684 return findViewByAccessibilityIdTraversal(accessibilityId); 15685 } 15686 15687 /** 15688 * Performs the traversal to find a view by its unuque and stable accessibility id. 15689 * 15690 * <strong>Note:</strong>This method does not stop at the root namespace 15691 * boundary since the user can touch the screen at an arbitrary location 15692 * potentially crossing the root namespace bounday which will send an 15693 * accessibility event to accessibility services and they should be able 15694 * to obtain the event source. Also accessibility ids are guaranteed to be 15695 * unique in the window. 15696 * 15697 * @param accessibilityId The accessibility id. 15698 * @return The found view. 15699 * 15700 * @hide 15701 */ 15702 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 15703 if (getAccessibilityViewId() == accessibilityId) { 15704 return this; 15705 } 15706 return null; 15707 } 15708 15709 /** 15710 * Look for a child view with the given tag. If this view has the given 15711 * tag, return this view. 15712 * 15713 * @param tag The tag to search for, using "tag.equals(getTag())". 15714 * @return The View that has the given tag in the hierarchy or null 15715 */ 15716 public final View findViewWithTag(Object tag) { 15717 if (tag == null) { 15718 return null; 15719 } 15720 return findViewWithTagTraversal(tag); 15721 } 15722 15723 /** 15724 * {@hide} 15725 * Look for a child view that matches the specified predicate. 15726 * If this view matches the predicate, return this view. 15727 * 15728 * @param predicate The predicate to evaluate. 15729 * @return The first view that matches the predicate or null. 15730 */ 15731 public final View findViewByPredicate(Predicate<View> predicate) { 15732 return findViewByPredicateTraversal(predicate, null); 15733 } 15734 15735 /** 15736 * {@hide} 15737 * Look for a child view that matches the specified predicate, 15738 * starting with the specified view and its descendents and then 15739 * recusively searching the ancestors and siblings of that view 15740 * until this view is reached. 15741 * 15742 * This method is useful in cases where the predicate does not match 15743 * a single unique view (perhaps multiple views use the same id) 15744 * and we are trying to find the view that is "closest" in scope to the 15745 * starting view. 15746 * 15747 * @param start The view to start from. 15748 * @param predicate The predicate to evaluate. 15749 * @return The first view that matches the predicate or null. 15750 */ 15751 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 15752 View childToSkip = null; 15753 for (;;) { 15754 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 15755 if (view != null || start == this) { 15756 return view; 15757 } 15758 15759 ViewParent parent = start.getParent(); 15760 if (parent == null || !(parent instanceof View)) { 15761 return null; 15762 } 15763 15764 childToSkip = start; 15765 start = (View) parent; 15766 } 15767 } 15768 15769 /** 15770 * Sets the identifier for this view. The identifier does not have to be 15771 * unique in this view's hierarchy. The identifier should be a positive 15772 * number. 15773 * 15774 * @see #NO_ID 15775 * @see #getId() 15776 * @see #findViewById(int) 15777 * 15778 * @param id a number used to identify the view 15779 * 15780 * @attr ref android.R.styleable#View_id 15781 */ 15782 public void setId(int id) { 15783 mID = id; 15784 if (mID == View.NO_ID && mLabelForId != View.NO_ID) { 15785 mID = generateViewId(); 15786 } 15787 } 15788 15789 /** 15790 * {@hide} 15791 * 15792 * @param isRoot true if the view belongs to the root namespace, false 15793 * otherwise 15794 */ 15795 public void setIsRootNamespace(boolean isRoot) { 15796 if (isRoot) { 15797 mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE; 15798 } else { 15799 mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE; 15800 } 15801 } 15802 15803 /** 15804 * {@hide} 15805 * 15806 * @return true if the view belongs to the root namespace, false otherwise 15807 */ 15808 public boolean isRootNamespace() { 15809 return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0; 15810 } 15811 15812 /** 15813 * Returns this view's identifier. 15814 * 15815 * @return a positive integer used to identify the view or {@link #NO_ID} 15816 * if the view has no ID 15817 * 15818 * @see #setId(int) 15819 * @see #findViewById(int) 15820 * @attr ref android.R.styleable#View_id 15821 */ 15822 @ViewDebug.CapturedViewProperty 15823 public int getId() { 15824 return mID; 15825 } 15826 15827 /** 15828 * Returns this view's tag. 15829 * 15830 * @return the Object stored in this view as a tag 15831 * 15832 * @see #setTag(Object) 15833 * @see #getTag(int) 15834 */ 15835 @ViewDebug.ExportedProperty 15836 public Object getTag() { 15837 return mTag; 15838 } 15839 15840 /** 15841 * Sets the tag associated with this view. A tag can be used to mark 15842 * a view in its hierarchy and does not have to be unique within the 15843 * hierarchy. Tags can also be used to store data within a view without 15844 * resorting to another data structure. 15845 * 15846 * @param tag an Object to tag the view with 15847 * 15848 * @see #getTag() 15849 * @see #setTag(int, Object) 15850 */ 15851 public void setTag(final Object tag) { 15852 mTag = tag; 15853 } 15854 15855 /** 15856 * Returns the tag associated with this view and the specified key. 15857 * 15858 * @param key The key identifying the tag 15859 * 15860 * @return the Object stored in this view as a tag 15861 * 15862 * @see #setTag(int, Object) 15863 * @see #getTag() 15864 */ 15865 public Object getTag(int key) { 15866 if (mKeyedTags != null) return mKeyedTags.get(key); 15867 return null; 15868 } 15869 15870 /** 15871 * Sets a tag associated with this view and a key. A tag can be used 15872 * to mark a view in its hierarchy and does not have to be unique within 15873 * the hierarchy. Tags can also be used to store data within a view 15874 * without resorting to another data structure. 15875 * 15876 * The specified key should be an id declared in the resources of the 15877 * application to ensure it is unique (see the <a 15878 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 15879 * Keys identified as belonging to 15880 * the Android framework or not associated with any package will cause 15881 * an {@link IllegalArgumentException} to be thrown. 15882 * 15883 * @param key The key identifying the tag 15884 * @param tag An Object to tag the view with 15885 * 15886 * @throws IllegalArgumentException If they specified key is not valid 15887 * 15888 * @see #setTag(Object) 15889 * @see #getTag(int) 15890 */ 15891 public void setTag(int key, final Object tag) { 15892 // If the package id is 0x00 or 0x01, it's either an undefined package 15893 // or a framework id 15894 if ((key >>> 24) < 2) { 15895 throw new IllegalArgumentException("The key must be an application-specific " 15896 + "resource id."); 15897 } 15898 15899 setKeyedTag(key, tag); 15900 } 15901 15902 /** 15903 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 15904 * framework id. 15905 * 15906 * @hide 15907 */ 15908 public void setTagInternal(int key, Object tag) { 15909 if ((key >>> 24) != 0x1) { 15910 throw new IllegalArgumentException("The key must be a framework-specific " 15911 + "resource id."); 15912 } 15913 15914 setKeyedTag(key, tag); 15915 } 15916 15917 private void setKeyedTag(int key, Object tag) { 15918 if (mKeyedTags == null) { 15919 mKeyedTags = new SparseArray<Object>(2); 15920 } 15921 15922 mKeyedTags.put(key, tag); 15923 } 15924 15925 /** 15926 * Prints information about this view in the log output, with the tag 15927 * {@link #VIEW_LOG_TAG}. 15928 * 15929 * @hide 15930 */ 15931 public void debug() { 15932 debug(0); 15933 } 15934 15935 /** 15936 * Prints information about this view in the log output, with the tag 15937 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 15938 * indentation defined by the <code>depth</code>. 15939 * 15940 * @param depth the indentation level 15941 * 15942 * @hide 15943 */ 15944 protected void debug(int depth) { 15945 String output = debugIndent(depth - 1); 15946 15947 output += "+ " + this; 15948 int id = getId(); 15949 if (id != -1) { 15950 output += " (id=" + id + ")"; 15951 } 15952 Object tag = getTag(); 15953 if (tag != null) { 15954 output += " (tag=" + tag + ")"; 15955 } 15956 Log.d(VIEW_LOG_TAG, output); 15957 15958 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 15959 output = debugIndent(depth) + " FOCUSED"; 15960 Log.d(VIEW_LOG_TAG, output); 15961 } 15962 15963 output = debugIndent(depth); 15964 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 15965 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 15966 + "} "; 15967 Log.d(VIEW_LOG_TAG, output); 15968 15969 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 15970 || mPaddingBottom != 0) { 15971 output = debugIndent(depth); 15972 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 15973 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 15974 Log.d(VIEW_LOG_TAG, output); 15975 } 15976 15977 output = debugIndent(depth); 15978 output += "mMeasureWidth=" + mMeasuredWidth + 15979 " mMeasureHeight=" + mMeasuredHeight; 15980 Log.d(VIEW_LOG_TAG, output); 15981 15982 output = debugIndent(depth); 15983 if (mLayoutParams == null) { 15984 output += "BAD! no layout params"; 15985 } else { 15986 output = mLayoutParams.debug(output); 15987 } 15988 Log.d(VIEW_LOG_TAG, output); 15989 15990 output = debugIndent(depth); 15991 output += "flags={"; 15992 output += View.printFlags(mViewFlags); 15993 output += "}"; 15994 Log.d(VIEW_LOG_TAG, output); 15995 15996 output = debugIndent(depth); 15997 output += "privateFlags={"; 15998 output += View.printPrivateFlags(mPrivateFlags); 15999 output += "}"; 16000 Log.d(VIEW_LOG_TAG, output); 16001 } 16002 16003 /** 16004 * Creates a string of whitespaces used for indentation. 16005 * 16006 * @param depth the indentation level 16007 * @return a String containing (depth * 2 + 3) * 2 white spaces 16008 * 16009 * @hide 16010 */ 16011 protected static String debugIndent(int depth) { 16012 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 16013 for (int i = 0; i < (depth * 2) + 3; i++) { 16014 spaces.append(' ').append(' '); 16015 } 16016 return spaces.toString(); 16017 } 16018 16019 /** 16020 * <p>Return the offset of the widget's text baseline from the widget's top 16021 * boundary. If this widget does not support baseline alignment, this 16022 * method returns -1. </p> 16023 * 16024 * @return the offset of the baseline within the widget's bounds or -1 16025 * if baseline alignment is not supported 16026 */ 16027 @ViewDebug.ExportedProperty(category = "layout") 16028 public int getBaseline() { 16029 return -1; 16030 } 16031 16032 /** 16033 * Returns whether the view hierarchy is currently undergoing a layout pass. This 16034 * information is useful to avoid situations such as calling {@link #requestLayout()} during 16035 * a layout pass. 16036 * 16037 * @return whether the view hierarchy is currently undergoing a layout pass 16038 */ 16039 public boolean isInLayout() { 16040 ViewRootImpl viewRoot = getViewRootImpl(); 16041 return (viewRoot != null && viewRoot.isInLayout()); 16042 } 16043 16044 /** 16045 * Call this when something has changed which has invalidated the 16046 * layout of this view. This will schedule a layout pass of the view 16047 * tree. This should not be called while the view hierarchy is currently in a layout 16048 * pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the 16049 * end of the current layout pass (and then layout will run again) or after the current 16050 * frame is drawn and the next layout occurs. 16051 * 16052 * <p>Subclasses which override this method should call the superclass method to 16053 * handle possible request-during-layout errors correctly.</p> 16054 */ 16055 public void requestLayout() { 16056 if (mMeasureCache != null) mMeasureCache.clear(); 16057 16058 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) { 16059 // Only trigger request-during-layout logic if this is the view requesting it, 16060 // not the views in its parent hierarchy 16061 ViewRootImpl viewRoot = getViewRootImpl(); 16062 if (viewRoot != null && viewRoot.isInLayout()) { 16063 if (!viewRoot.requestLayoutDuringLayout(this)) { 16064 return; 16065 } 16066 } 16067 mAttachInfo.mViewRequestingLayout = this; 16068 } 16069 16070 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 16071 mPrivateFlags |= PFLAG_INVALIDATED; 16072 16073 if (mParent != null && !mParent.isLayoutRequested()) { 16074 mParent.requestLayout(); 16075 } 16076 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == this) { 16077 mAttachInfo.mViewRequestingLayout = null; 16078 } 16079 } 16080 16081 /** 16082 * Forces this view to be laid out during the next layout pass. 16083 * This method does not call requestLayout() or forceLayout() 16084 * on the parent. 16085 */ 16086 public void forceLayout() { 16087 if (mMeasureCache != null) mMeasureCache.clear(); 16088 16089 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 16090 mPrivateFlags |= PFLAG_INVALIDATED; 16091 } 16092 16093 /** 16094 * <p> 16095 * This is called to find out how big a view should be. The parent 16096 * supplies constraint information in the width and height parameters. 16097 * </p> 16098 * 16099 * <p> 16100 * The actual measurement work of a view is performed in 16101 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 16102 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 16103 * </p> 16104 * 16105 * 16106 * @param widthMeasureSpec Horizontal space requirements as imposed by the 16107 * parent 16108 * @param heightMeasureSpec Vertical space requirements as imposed by the 16109 * parent 16110 * 16111 * @see #onMeasure(int, int) 16112 */ 16113 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 16114 boolean optical = isLayoutModeOptical(this); 16115 if (optical != isLayoutModeOptical(mParent)) { 16116 Insets insets = getOpticalInsets(); 16117 int oWidth = insets.left + insets.right; 16118 int oHeight = insets.top + insets.bottom; 16119 widthMeasureSpec = MeasureSpec.adjust(widthMeasureSpec, optical ? -oWidth : oWidth); 16120 heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight); 16121 } 16122 16123 // Suppress sign extension for the low bytes 16124 long key = (long) widthMeasureSpec << 32 | (long) heightMeasureSpec & 0xffffffffL; 16125 if (mMeasureCache == null) mMeasureCache = new LongSparseLongArray(2); 16126 16127 if ((mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT || 16128 widthMeasureSpec != mOldWidthMeasureSpec || 16129 heightMeasureSpec != mOldHeightMeasureSpec) { 16130 16131 // first clears the measured dimension flag 16132 mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET; 16133 16134 resolveRtlPropertiesIfNeeded(); 16135 16136 int cacheIndex = (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT ? -1 : 16137 mMeasureCache.indexOfKey(key); 16138 if (cacheIndex < 0) { 16139 // measure ourselves, this should set the measured dimension flag back 16140 onMeasure(widthMeasureSpec, heightMeasureSpec); 16141 mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 16142 } else { 16143 long value = mMeasureCache.valueAt(cacheIndex); 16144 // Casting a long to int drops the high 32 bits, no mask needed 16145 setMeasuredDimension((int) (value >> 32), (int) value); 16146 mPrivateFlags3 |= PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 16147 } 16148 16149 // flag not set, setMeasuredDimension() was not invoked, we raise 16150 // an exception to warn the developer 16151 if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) { 16152 throw new IllegalStateException("onMeasure() did not set the" 16153 + " measured dimension by calling" 16154 + " setMeasuredDimension()"); 16155 } 16156 16157 mPrivateFlags |= PFLAG_LAYOUT_REQUIRED; 16158 } 16159 16160 mOldWidthMeasureSpec = widthMeasureSpec; 16161 mOldHeightMeasureSpec = heightMeasureSpec; 16162 16163 mMeasureCache.put(key, ((long) mMeasuredWidth) << 32 | 16164 (long) mMeasuredHeight & 0xffffffffL); // suppress sign extension 16165 } 16166 16167 /** 16168 * <p> 16169 * Measure the view and its content to determine the measured width and the 16170 * measured height. This method is invoked by {@link #measure(int, int)} and 16171 * should be overriden by subclasses to provide accurate and efficient 16172 * measurement of their contents. 16173 * </p> 16174 * 16175 * <p> 16176 * <strong>CONTRACT:</strong> When overriding this method, you 16177 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 16178 * measured width and height of this view. Failure to do so will trigger an 16179 * <code>IllegalStateException</code>, thrown by 16180 * {@link #measure(int, int)}. Calling the superclass' 16181 * {@link #onMeasure(int, int)} is a valid use. 16182 * </p> 16183 * 16184 * <p> 16185 * The base class implementation of measure defaults to the background size, 16186 * unless a larger size is allowed by the MeasureSpec. Subclasses should 16187 * override {@link #onMeasure(int, int)} to provide better measurements of 16188 * their content. 16189 * </p> 16190 * 16191 * <p> 16192 * If this method is overridden, it is the subclass's responsibility to make 16193 * sure the measured height and width are at least the view's minimum height 16194 * and width ({@link #getSuggestedMinimumHeight()} and 16195 * {@link #getSuggestedMinimumWidth()}). 16196 * </p> 16197 * 16198 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 16199 * The requirements are encoded with 16200 * {@link android.view.View.MeasureSpec}. 16201 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 16202 * The requirements are encoded with 16203 * {@link android.view.View.MeasureSpec}. 16204 * 16205 * @see #getMeasuredWidth() 16206 * @see #getMeasuredHeight() 16207 * @see #setMeasuredDimension(int, int) 16208 * @see #getSuggestedMinimumHeight() 16209 * @see #getSuggestedMinimumWidth() 16210 * @see android.view.View.MeasureSpec#getMode(int) 16211 * @see android.view.View.MeasureSpec#getSize(int) 16212 */ 16213 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 16214 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 16215 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 16216 } 16217 16218 /** 16219 * <p>This method must be called by {@link #onMeasure(int, int)} to store the 16220 * measured width and measured height. Failing to do so will trigger an 16221 * exception at measurement time.</p> 16222 * 16223 * @param measuredWidth The measured width of this view. May be a complex 16224 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 16225 * {@link #MEASURED_STATE_TOO_SMALL}. 16226 * @param measuredHeight The measured height of this view. May be a complex 16227 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 16228 * {@link #MEASURED_STATE_TOO_SMALL}. 16229 */ 16230 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 16231 boolean optical = isLayoutModeOptical(this); 16232 if (optical != isLayoutModeOptical(mParent)) { 16233 Insets insets = getOpticalInsets(); 16234 int opticalWidth = insets.left + insets.right; 16235 int opticalHeight = insets.top + insets.bottom; 16236 16237 measuredWidth += optical ? opticalWidth : -opticalWidth; 16238 measuredHeight += optical ? opticalHeight : -opticalHeight; 16239 } 16240 mMeasuredWidth = measuredWidth; 16241 mMeasuredHeight = measuredHeight; 16242 16243 mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET; 16244 } 16245 16246 /** 16247 * Merge two states as returned by {@link #getMeasuredState()}. 16248 * @param curState The current state as returned from a view or the result 16249 * of combining multiple views. 16250 * @param newState The new view state to combine. 16251 * @return Returns a new integer reflecting the combination of the two 16252 * states. 16253 */ 16254 public static int combineMeasuredStates(int curState, int newState) { 16255 return curState | newState; 16256 } 16257 16258 /** 16259 * Version of {@link #resolveSizeAndState(int, int, int)} 16260 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 16261 */ 16262 public static int resolveSize(int size, int measureSpec) { 16263 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 16264 } 16265 16266 /** 16267 * Utility to reconcile a desired size and state, with constraints imposed 16268 * by a MeasureSpec. Will take the desired size, unless a different size 16269 * is imposed by the constraints. The returned value is a compound integer, 16270 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 16271 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 16272 * size is smaller than the size the view wants to be. 16273 * 16274 * @param size How big the view wants to be 16275 * @param measureSpec Constraints imposed by the parent 16276 * @return Size information bit mask as defined by 16277 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 16278 */ 16279 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 16280 int result = size; 16281 int specMode = MeasureSpec.getMode(measureSpec); 16282 int specSize = MeasureSpec.getSize(measureSpec); 16283 switch (specMode) { 16284 case MeasureSpec.UNSPECIFIED: 16285 result = size; 16286 break; 16287 case MeasureSpec.AT_MOST: 16288 if (specSize < size) { 16289 result = specSize | MEASURED_STATE_TOO_SMALL; 16290 } else { 16291 result = size; 16292 } 16293 break; 16294 case MeasureSpec.EXACTLY: 16295 result = specSize; 16296 break; 16297 } 16298 return result | (childMeasuredState&MEASURED_STATE_MASK); 16299 } 16300 16301 /** 16302 * Utility to return a default size. Uses the supplied size if the 16303 * MeasureSpec imposed no constraints. Will get larger if allowed 16304 * by the MeasureSpec. 16305 * 16306 * @param size Default size for this view 16307 * @param measureSpec Constraints imposed by the parent 16308 * @return The size this view should be. 16309 */ 16310 public static int getDefaultSize(int size, int measureSpec) { 16311 int result = size; 16312 int specMode = MeasureSpec.getMode(measureSpec); 16313 int specSize = MeasureSpec.getSize(measureSpec); 16314 16315 switch (specMode) { 16316 case MeasureSpec.UNSPECIFIED: 16317 result = size; 16318 break; 16319 case MeasureSpec.AT_MOST: 16320 case MeasureSpec.EXACTLY: 16321 result = specSize; 16322 break; 16323 } 16324 return result; 16325 } 16326 16327 /** 16328 * Returns the suggested minimum height that the view should use. This 16329 * returns the maximum of the view's minimum height 16330 * and the background's minimum height 16331 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 16332 * <p> 16333 * When being used in {@link #onMeasure(int, int)}, the caller should still 16334 * ensure the returned height is within the requirements of the parent. 16335 * 16336 * @return The suggested minimum height of the view. 16337 */ 16338 protected int getSuggestedMinimumHeight() { 16339 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 16340 16341 } 16342 16343 /** 16344 * Returns the suggested minimum width that the view should use. This 16345 * returns the maximum of the view's minimum width) 16346 * and the background's minimum width 16347 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 16348 * <p> 16349 * When being used in {@link #onMeasure(int, int)}, the caller should still 16350 * ensure the returned width is within the requirements of the parent. 16351 * 16352 * @return The suggested minimum width of the view. 16353 */ 16354 protected int getSuggestedMinimumWidth() { 16355 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 16356 } 16357 16358 /** 16359 * Returns the minimum height of the view. 16360 * 16361 * @return the minimum height the view will try to be. 16362 * 16363 * @see #setMinimumHeight(int) 16364 * 16365 * @attr ref android.R.styleable#View_minHeight 16366 */ 16367 public int getMinimumHeight() { 16368 return mMinHeight; 16369 } 16370 16371 /** 16372 * Sets the minimum height of the view. It is not guaranteed the view will 16373 * be able to achieve this minimum height (for example, if its parent layout 16374 * constrains it with less available height). 16375 * 16376 * @param minHeight The minimum height the view will try to be. 16377 * 16378 * @see #getMinimumHeight() 16379 * 16380 * @attr ref android.R.styleable#View_minHeight 16381 */ 16382 public void setMinimumHeight(int minHeight) { 16383 mMinHeight = minHeight; 16384 requestLayout(); 16385 } 16386 16387 /** 16388 * Returns the minimum width of the view. 16389 * 16390 * @return the minimum width the view will try to be. 16391 * 16392 * @see #setMinimumWidth(int) 16393 * 16394 * @attr ref android.R.styleable#View_minWidth 16395 */ 16396 public int getMinimumWidth() { 16397 return mMinWidth; 16398 } 16399 16400 /** 16401 * Sets the minimum width of the view. It is not guaranteed the view will 16402 * be able to achieve this minimum width (for example, if its parent layout 16403 * constrains it with less available width). 16404 * 16405 * @param minWidth The minimum width the view will try to be. 16406 * 16407 * @see #getMinimumWidth() 16408 * 16409 * @attr ref android.R.styleable#View_minWidth 16410 */ 16411 public void setMinimumWidth(int minWidth) { 16412 mMinWidth = minWidth; 16413 requestLayout(); 16414 16415 } 16416 16417 /** 16418 * Get the animation currently associated with this view. 16419 * 16420 * @return The animation that is currently playing or 16421 * scheduled to play for this view. 16422 */ 16423 public Animation getAnimation() { 16424 return mCurrentAnimation; 16425 } 16426 16427 /** 16428 * Start the specified animation now. 16429 * 16430 * @param animation the animation to start now 16431 */ 16432 public void startAnimation(Animation animation) { 16433 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 16434 setAnimation(animation); 16435 invalidateParentCaches(); 16436 invalidate(true); 16437 } 16438 16439 /** 16440 * Cancels any animations for this view. 16441 */ 16442 public void clearAnimation() { 16443 if (mCurrentAnimation != null) { 16444 mCurrentAnimation.detach(); 16445 } 16446 mCurrentAnimation = null; 16447 invalidateParentIfNeeded(); 16448 } 16449 16450 /** 16451 * Sets the next animation to play for this view. 16452 * If you want the animation to play immediately, use 16453 * {@link #startAnimation(android.view.animation.Animation)} instead. 16454 * This method provides allows fine-grained 16455 * control over the start time and invalidation, but you 16456 * must make sure that 1) the animation has a start time set, and 16457 * 2) the view's parent (which controls animations on its children) 16458 * will be invalidated when the animation is supposed to 16459 * start. 16460 * 16461 * @param animation The next animation, or null. 16462 */ 16463 public void setAnimation(Animation animation) { 16464 mCurrentAnimation = animation; 16465 16466 if (animation != null) { 16467 // If the screen is off assume the animation start time is now instead of 16468 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 16469 // would cause the animation to start when the screen turns back on 16470 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 16471 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 16472 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 16473 } 16474 animation.reset(); 16475 } 16476 } 16477 16478 /** 16479 * Invoked by a parent ViewGroup to notify the start of the animation 16480 * currently associated with this view. If you override this method, 16481 * always call super.onAnimationStart(); 16482 * 16483 * @see #setAnimation(android.view.animation.Animation) 16484 * @see #getAnimation() 16485 */ 16486 protected void onAnimationStart() { 16487 mPrivateFlags |= PFLAG_ANIMATION_STARTED; 16488 } 16489 16490 /** 16491 * Invoked by a parent ViewGroup to notify the end of the animation 16492 * currently associated with this view. If you override this method, 16493 * always call super.onAnimationEnd(); 16494 * 16495 * @see #setAnimation(android.view.animation.Animation) 16496 * @see #getAnimation() 16497 */ 16498 protected void onAnimationEnd() { 16499 mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 16500 } 16501 16502 /** 16503 * Invoked if there is a Transform that involves alpha. Subclass that can 16504 * draw themselves with the specified alpha should return true, and then 16505 * respect that alpha when their onDraw() is called. If this returns false 16506 * then the view may be redirected to draw into an offscreen buffer to 16507 * fulfill the request, which will look fine, but may be slower than if the 16508 * subclass handles it internally. The default implementation returns false. 16509 * 16510 * @param alpha The alpha (0..255) to apply to the view's drawing 16511 * @return true if the view can draw with the specified alpha. 16512 */ 16513 protected boolean onSetAlpha(int alpha) { 16514 return false; 16515 } 16516 16517 /** 16518 * This is used by the RootView to perform an optimization when 16519 * the view hierarchy contains one or several SurfaceView. 16520 * SurfaceView is always considered transparent, but its children are not, 16521 * therefore all View objects remove themselves from the global transparent 16522 * region (passed as a parameter to this function). 16523 * 16524 * @param region The transparent region for this ViewAncestor (window). 16525 * 16526 * @return Returns true if the effective visibility of the view at this 16527 * point is opaque, regardless of the transparent region; returns false 16528 * if it is possible for underlying windows to be seen behind the view. 16529 * 16530 * {@hide} 16531 */ 16532 public boolean gatherTransparentRegion(Region region) { 16533 final AttachInfo attachInfo = mAttachInfo; 16534 if (region != null && attachInfo != null) { 16535 final int pflags = mPrivateFlags; 16536 if ((pflags & PFLAG_SKIP_DRAW) == 0) { 16537 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 16538 // remove it from the transparent region. 16539 final int[] location = attachInfo.mTransparentLocation; 16540 getLocationInWindow(location); 16541 region.op(location[0], location[1], location[0] + mRight - mLeft, 16542 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 16543 } else if ((pflags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 16544 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 16545 // exists, so we remove the background drawable's non-transparent 16546 // parts from this transparent region. 16547 applyDrawableToTransparentRegion(mBackground, region); 16548 } 16549 } 16550 return true; 16551 } 16552 16553 /** 16554 * Play a sound effect for this view. 16555 * 16556 * <p>The framework will play sound effects for some built in actions, such as 16557 * clicking, but you may wish to play these effects in your widget, 16558 * for instance, for internal navigation. 16559 * 16560 * <p>The sound effect will only be played if sound effects are enabled by the user, and 16561 * {@link #isSoundEffectsEnabled()} is true. 16562 * 16563 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 16564 */ 16565 public void playSoundEffect(int soundConstant) { 16566 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 16567 return; 16568 } 16569 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 16570 } 16571 16572 /** 16573 * BZZZTT!!1! 16574 * 16575 * <p>Provide haptic feedback to the user for this view. 16576 * 16577 * <p>The framework will provide haptic feedback for some built in actions, 16578 * such as long presses, but you may wish to provide feedback for your 16579 * own widget. 16580 * 16581 * <p>The feedback will only be performed if 16582 * {@link #isHapticFeedbackEnabled()} is true. 16583 * 16584 * @param feedbackConstant One of the constants defined in 16585 * {@link HapticFeedbackConstants} 16586 */ 16587 public boolean performHapticFeedback(int feedbackConstant) { 16588 return performHapticFeedback(feedbackConstant, 0); 16589 } 16590 16591 /** 16592 * BZZZTT!!1! 16593 * 16594 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 16595 * 16596 * @param feedbackConstant One of the constants defined in 16597 * {@link HapticFeedbackConstants} 16598 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 16599 */ 16600 public boolean performHapticFeedback(int feedbackConstant, int flags) { 16601 if (mAttachInfo == null) { 16602 return false; 16603 } 16604 //noinspection SimplifiableIfStatement 16605 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 16606 && !isHapticFeedbackEnabled()) { 16607 return false; 16608 } 16609 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 16610 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 16611 } 16612 16613 /** 16614 * Request that the visibility of the status bar or other screen/window 16615 * decorations be changed. 16616 * 16617 * <p>This method is used to put the over device UI into temporary modes 16618 * where the user's attention is focused more on the application content, 16619 * by dimming or hiding surrounding system affordances. This is typically 16620 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 16621 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 16622 * to be placed behind the action bar (and with these flags other system 16623 * affordances) so that smooth transitions between hiding and showing them 16624 * can be done. 16625 * 16626 * <p>Two representative examples of the use of system UI visibility is 16627 * implementing a content browsing application (like a magazine reader) 16628 * and a video playing application. 16629 * 16630 * <p>The first code shows a typical implementation of a View in a content 16631 * browsing application. In this implementation, the application goes 16632 * into a content-oriented mode by hiding the status bar and action bar, 16633 * and putting the navigation elements into lights out mode. The user can 16634 * then interact with content while in this mode. Such an application should 16635 * provide an easy way for the user to toggle out of the mode (such as to 16636 * check information in the status bar or access notifications). In the 16637 * implementation here, this is done simply by tapping on the content. 16638 * 16639 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 16640 * content} 16641 * 16642 * <p>This second code sample shows a typical implementation of a View 16643 * in a video playing application. In this situation, while the video is 16644 * playing the application would like to go into a complete full-screen mode, 16645 * to use as much of the display as possible for the video. When in this state 16646 * the user can not interact with the application; the system intercepts 16647 * touching on the screen to pop the UI out of full screen mode. See 16648 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 16649 * 16650 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 16651 * content} 16652 * 16653 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16654 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16655 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16656 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_ALLOW_TRANSIENT}, 16657 * {@link #SYSTEM_UI_FLAG_TRANSPARENT_STATUS}, 16658 * and {@link #SYSTEM_UI_FLAG_TRANSPARENT_NAVIGATION}. 16659 */ 16660 public void setSystemUiVisibility(int visibility) { 16661 if (visibility != mSystemUiVisibility) { 16662 mSystemUiVisibility = visibility; 16663 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16664 mParent.recomputeViewAttributes(this); 16665 } 16666 } 16667 } 16668 16669 /** 16670 * Returns the last {@link #setSystemUiVisibility(int)} that this view has requested. 16671 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16672 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16673 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16674 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_ALLOW_TRANSIENT}, 16675 * {@link #SYSTEM_UI_FLAG_TRANSPARENT_STATUS}, 16676 * and {@link #SYSTEM_UI_FLAG_TRANSPARENT_NAVIGATION}. 16677 */ 16678 public int getSystemUiVisibility() { 16679 return mSystemUiVisibility; 16680 } 16681 16682 /** 16683 * Returns the current system UI visibility that is currently set for 16684 * the entire window. This is the combination of the 16685 * {@link #setSystemUiVisibility(int)} values supplied by all of the 16686 * views in the window. 16687 */ 16688 public int getWindowSystemUiVisibility() { 16689 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 16690 } 16691 16692 /** 16693 * Override to find out when the window's requested system UI visibility 16694 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 16695 * This is different from the callbacks received through 16696 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 16697 * in that this is only telling you about the local request of the window, 16698 * not the actual values applied by the system. 16699 */ 16700 public void onWindowSystemUiVisibilityChanged(int visible) { 16701 } 16702 16703 /** 16704 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 16705 * the view hierarchy. 16706 */ 16707 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 16708 onWindowSystemUiVisibilityChanged(visible); 16709 } 16710 16711 /** 16712 * Set a listener to receive callbacks when the visibility of the system bar changes. 16713 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 16714 */ 16715 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 16716 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 16717 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16718 mParent.recomputeViewAttributes(this); 16719 } 16720 } 16721 16722 /** 16723 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 16724 * the view hierarchy. 16725 */ 16726 public void dispatchSystemUiVisibilityChanged(int visibility) { 16727 ListenerInfo li = mListenerInfo; 16728 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 16729 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 16730 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 16731 } 16732 } 16733 16734 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 16735 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 16736 if (val != mSystemUiVisibility) { 16737 setSystemUiVisibility(val); 16738 return true; 16739 } 16740 return false; 16741 } 16742 16743 /** @hide */ 16744 public void setDisabledSystemUiVisibility(int flags) { 16745 if (mAttachInfo != null) { 16746 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 16747 mAttachInfo.mDisabledSystemUiVisibility = flags; 16748 if (mParent != null) { 16749 mParent.recomputeViewAttributes(this); 16750 } 16751 } 16752 } 16753 } 16754 16755 /** 16756 * Creates an image that the system displays during the drag and drop 16757 * operation. This is called a "drag shadow". The default implementation 16758 * for a DragShadowBuilder based on a View returns an image that has exactly the same 16759 * appearance as the given View. The default also positions the center of the drag shadow 16760 * directly under the touch point. If no View is provided (the constructor with no parameters 16761 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 16762 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 16763 * default is an invisible drag shadow. 16764 * <p> 16765 * You are not required to use the View you provide to the constructor as the basis of the 16766 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 16767 * anything you want as the drag shadow. 16768 * </p> 16769 * <p> 16770 * You pass a DragShadowBuilder object to the system when you start the drag. The system 16771 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 16772 * size and position of the drag shadow. It uses this data to construct a 16773 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 16774 * so that your application can draw the shadow image in the Canvas. 16775 * </p> 16776 * 16777 * <div class="special reference"> 16778 * <h3>Developer Guides</h3> 16779 * <p>For a guide to implementing drag and drop features, read the 16780 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16781 * </div> 16782 */ 16783 public static class DragShadowBuilder { 16784 private final WeakReference<View> mView; 16785 16786 /** 16787 * Constructs a shadow image builder based on a View. By default, the resulting drag 16788 * shadow will have the same appearance and dimensions as the View, with the touch point 16789 * over the center of the View. 16790 * @param view A View. Any View in scope can be used. 16791 */ 16792 public DragShadowBuilder(View view) { 16793 mView = new WeakReference<View>(view); 16794 } 16795 16796 /** 16797 * Construct a shadow builder object with no associated View. This 16798 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 16799 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 16800 * to supply the drag shadow's dimensions and appearance without 16801 * reference to any View object. If they are not overridden, then the result is an 16802 * invisible drag shadow. 16803 */ 16804 public DragShadowBuilder() { 16805 mView = new WeakReference<View>(null); 16806 } 16807 16808 /** 16809 * Returns the View object that had been passed to the 16810 * {@link #View.DragShadowBuilder(View)} 16811 * constructor. If that View parameter was {@code null} or if the 16812 * {@link #View.DragShadowBuilder()} 16813 * constructor was used to instantiate the builder object, this method will return 16814 * null. 16815 * 16816 * @return The View object associate with this builder object. 16817 */ 16818 @SuppressWarnings({"JavadocReference"}) 16819 final public View getView() { 16820 return mView.get(); 16821 } 16822 16823 /** 16824 * Provides the metrics for the shadow image. These include the dimensions of 16825 * the shadow image, and the point within that shadow that should 16826 * be centered under the touch location while dragging. 16827 * <p> 16828 * The default implementation sets the dimensions of the shadow to be the 16829 * same as the dimensions of the View itself and centers the shadow under 16830 * the touch point. 16831 * </p> 16832 * 16833 * @param shadowSize A {@link android.graphics.Point} containing the width and height 16834 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 16835 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 16836 * image. 16837 * 16838 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 16839 * shadow image that should be underneath the touch point during the drag and drop 16840 * operation. Your application must set {@link android.graphics.Point#x} to the 16841 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 16842 */ 16843 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 16844 final View view = mView.get(); 16845 if (view != null) { 16846 shadowSize.set(view.getWidth(), view.getHeight()); 16847 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 16848 } else { 16849 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 16850 } 16851 } 16852 16853 /** 16854 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 16855 * based on the dimensions it received from the 16856 * {@link #onProvideShadowMetrics(Point, Point)} callback. 16857 * 16858 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 16859 */ 16860 public void onDrawShadow(Canvas canvas) { 16861 final View view = mView.get(); 16862 if (view != null) { 16863 view.draw(canvas); 16864 } else { 16865 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 16866 } 16867 } 16868 } 16869 16870 /** 16871 * Starts a drag and drop operation. When your application calls this method, it passes a 16872 * {@link android.view.View.DragShadowBuilder} object to the system. The 16873 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 16874 * to get metrics for the drag shadow, and then calls the object's 16875 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 16876 * <p> 16877 * Once the system has the drag shadow, it begins the drag and drop operation by sending 16878 * drag events to all the View objects in your application that are currently visible. It does 16879 * this either by calling the View object's drag listener (an implementation of 16880 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 16881 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 16882 * Both are passed a {@link android.view.DragEvent} object that has a 16883 * {@link android.view.DragEvent#getAction()} value of 16884 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 16885 * </p> 16886 * <p> 16887 * Your application can invoke startDrag() on any attached View object. The View object does not 16888 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 16889 * be related to the View the user selected for dragging. 16890 * </p> 16891 * @param data A {@link android.content.ClipData} object pointing to the data to be 16892 * transferred by the drag and drop operation. 16893 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 16894 * drag shadow. 16895 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 16896 * drop operation. This Object is put into every DragEvent object sent by the system during the 16897 * current drag. 16898 * <p> 16899 * myLocalState is a lightweight mechanism for the sending information from the dragged View 16900 * to the target Views. For example, it can contain flags that differentiate between a 16901 * a copy operation and a move operation. 16902 * </p> 16903 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 16904 * so the parameter should be set to 0. 16905 * @return {@code true} if the method completes successfully, or 16906 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 16907 * do a drag, and so no drag operation is in progress. 16908 */ 16909 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 16910 Object myLocalState, int flags) { 16911 if (ViewDebug.DEBUG_DRAG) { 16912 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 16913 } 16914 boolean okay = false; 16915 16916 Point shadowSize = new Point(); 16917 Point shadowTouchPoint = new Point(); 16918 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 16919 16920 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 16921 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 16922 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 16923 } 16924 16925 if (ViewDebug.DEBUG_DRAG) { 16926 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 16927 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 16928 } 16929 Surface surface = new Surface(); 16930 try { 16931 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 16932 flags, shadowSize.x, shadowSize.y, surface); 16933 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 16934 + " surface=" + surface); 16935 if (token != null) { 16936 Canvas canvas = surface.lockCanvas(null); 16937 try { 16938 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 16939 shadowBuilder.onDrawShadow(canvas); 16940 } finally { 16941 surface.unlockCanvasAndPost(canvas); 16942 } 16943 16944 final ViewRootImpl root = getViewRootImpl(); 16945 16946 // Cache the local state object for delivery with DragEvents 16947 root.setLocalDragState(myLocalState); 16948 16949 // repurpose 'shadowSize' for the last touch point 16950 root.getLastTouchPoint(shadowSize); 16951 16952 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 16953 shadowSize.x, shadowSize.y, 16954 shadowTouchPoint.x, shadowTouchPoint.y, data); 16955 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 16956 16957 // Off and running! Release our local surface instance; the drag 16958 // shadow surface is now managed by the system process. 16959 surface.release(); 16960 } 16961 } catch (Exception e) { 16962 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 16963 surface.destroy(); 16964 } 16965 16966 return okay; 16967 } 16968 16969 /** 16970 * Handles drag events sent by the system following a call to 16971 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 16972 *<p> 16973 * When the system calls this method, it passes a 16974 * {@link android.view.DragEvent} object. A call to 16975 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 16976 * in DragEvent. The method uses these to determine what is happening in the drag and drop 16977 * operation. 16978 * @param event The {@link android.view.DragEvent} sent by the system. 16979 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 16980 * in DragEvent, indicating the type of drag event represented by this object. 16981 * @return {@code true} if the method was successful, otherwise {@code false}. 16982 * <p> 16983 * The method should return {@code true} in response to an action type of 16984 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 16985 * operation. 16986 * </p> 16987 * <p> 16988 * The method should also return {@code true} in response to an action type of 16989 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 16990 * {@code false} if it didn't. 16991 * </p> 16992 */ 16993 public boolean onDragEvent(DragEvent event) { 16994 return false; 16995 } 16996 16997 /** 16998 * Detects if this View is enabled and has a drag event listener. 16999 * If both are true, then it calls the drag event listener with the 17000 * {@link android.view.DragEvent} it received. If the drag event listener returns 17001 * {@code true}, then dispatchDragEvent() returns {@code true}. 17002 * <p> 17003 * For all other cases, the method calls the 17004 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 17005 * method and returns its result. 17006 * </p> 17007 * <p> 17008 * This ensures that a drag event is always consumed, even if the View does not have a drag 17009 * event listener. However, if the View has a listener and the listener returns true, then 17010 * onDragEvent() is not called. 17011 * </p> 17012 */ 17013 public boolean dispatchDragEvent(DragEvent event) { 17014 ListenerInfo li = mListenerInfo; 17015 //noinspection SimplifiableIfStatement 17016 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 17017 && li.mOnDragListener.onDrag(this, event)) { 17018 return true; 17019 } 17020 return onDragEvent(event); 17021 } 17022 17023 boolean canAcceptDrag() { 17024 return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0; 17025 } 17026 17027 /** 17028 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 17029 * it is ever exposed at all. 17030 * @hide 17031 */ 17032 public void onCloseSystemDialogs(String reason) { 17033 } 17034 17035 /** 17036 * Given a Drawable whose bounds have been set to draw into this view, 17037 * update a Region being computed for 17038 * {@link #gatherTransparentRegion(android.graphics.Region)} so 17039 * that any non-transparent parts of the Drawable are removed from the 17040 * given transparent region. 17041 * 17042 * @param dr The Drawable whose transparency is to be applied to the region. 17043 * @param region A Region holding the current transparency information, 17044 * where any parts of the region that are set are considered to be 17045 * transparent. On return, this region will be modified to have the 17046 * transparency information reduced by the corresponding parts of the 17047 * Drawable that are not transparent. 17048 * {@hide} 17049 */ 17050 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 17051 if (DBG) { 17052 Log.i("View", "Getting transparent region for: " + this); 17053 } 17054 final Region r = dr.getTransparentRegion(); 17055 final Rect db = dr.getBounds(); 17056 final AttachInfo attachInfo = mAttachInfo; 17057 if (r != null && attachInfo != null) { 17058 final int w = getRight()-getLeft(); 17059 final int h = getBottom()-getTop(); 17060 if (db.left > 0) { 17061 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 17062 r.op(0, 0, db.left, h, Region.Op.UNION); 17063 } 17064 if (db.right < w) { 17065 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 17066 r.op(db.right, 0, w, h, Region.Op.UNION); 17067 } 17068 if (db.top > 0) { 17069 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 17070 r.op(0, 0, w, db.top, Region.Op.UNION); 17071 } 17072 if (db.bottom < h) { 17073 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 17074 r.op(0, db.bottom, w, h, Region.Op.UNION); 17075 } 17076 final int[] location = attachInfo.mTransparentLocation; 17077 getLocationInWindow(location); 17078 r.translate(location[0], location[1]); 17079 region.op(r, Region.Op.INTERSECT); 17080 } else { 17081 region.op(db, Region.Op.DIFFERENCE); 17082 } 17083 } 17084 17085 private void checkForLongClick(int delayOffset) { 17086 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 17087 mHasPerformedLongPress = false; 17088 17089 if (mPendingCheckForLongPress == null) { 17090 mPendingCheckForLongPress = new CheckForLongPress(); 17091 } 17092 mPendingCheckForLongPress.rememberWindowAttachCount(); 17093 postDelayed(mPendingCheckForLongPress, 17094 ViewConfiguration.getLongPressTimeout() - delayOffset); 17095 } 17096 } 17097 17098 /** 17099 * Inflate a view from an XML resource. This convenience method wraps the {@link 17100 * LayoutInflater} class, which provides a full range of options for view inflation. 17101 * 17102 * @param context The Context object for your activity or application. 17103 * @param resource The resource ID to inflate 17104 * @param root A view group that will be the parent. Used to properly inflate the 17105 * layout_* parameters. 17106 * @see LayoutInflater 17107 */ 17108 public static View inflate(Context context, int resource, ViewGroup root) { 17109 LayoutInflater factory = LayoutInflater.from(context); 17110 return factory.inflate(resource, root); 17111 } 17112 17113 /** 17114 * Scroll the view with standard behavior for scrolling beyond the normal 17115 * content boundaries. Views that call this method should override 17116 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 17117 * results of an over-scroll operation. 17118 * 17119 * Views can use this method to handle any touch or fling-based scrolling. 17120 * 17121 * @param deltaX Change in X in pixels 17122 * @param deltaY Change in Y in pixels 17123 * @param scrollX Current X scroll value in pixels before applying deltaX 17124 * @param scrollY Current Y scroll value in pixels before applying deltaY 17125 * @param scrollRangeX Maximum content scroll range along the X axis 17126 * @param scrollRangeY Maximum content scroll range along the Y axis 17127 * @param maxOverScrollX Number of pixels to overscroll by in either direction 17128 * along the X axis. 17129 * @param maxOverScrollY Number of pixels to overscroll by in either direction 17130 * along the Y axis. 17131 * @param isTouchEvent true if this scroll operation is the result of a touch event. 17132 * @return true if scrolling was clamped to an over-scroll boundary along either 17133 * axis, false otherwise. 17134 */ 17135 @SuppressWarnings({"UnusedParameters"}) 17136 protected boolean overScrollBy(int deltaX, int deltaY, 17137 int scrollX, int scrollY, 17138 int scrollRangeX, int scrollRangeY, 17139 int maxOverScrollX, int maxOverScrollY, 17140 boolean isTouchEvent) { 17141 final int overScrollMode = mOverScrollMode; 17142 final boolean canScrollHorizontal = 17143 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 17144 final boolean canScrollVertical = 17145 computeVerticalScrollRange() > computeVerticalScrollExtent(); 17146 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 17147 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 17148 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 17149 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 17150 17151 int newScrollX = scrollX + deltaX; 17152 if (!overScrollHorizontal) { 17153 maxOverScrollX = 0; 17154 } 17155 17156 int newScrollY = scrollY + deltaY; 17157 if (!overScrollVertical) { 17158 maxOverScrollY = 0; 17159 } 17160 17161 // Clamp values if at the limits and record 17162 final int left = -maxOverScrollX; 17163 final int right = maxOverScrollX + scrollRangeX; 17164 final int top = -maxOverScrollY; 17165 final int bottom = maxOverScrollY + scrollRangeY; 17166 17167 boolean clampedX = false; 17168 if (newScrollX > right) { 17169 newScrollX = right; 17170 clampedX = true; 17171 } else if (newScrollX < left) { 17172 newScrollX = left; 17173 clampedX = true; 17174 } 17175 17176 boolean clampedY = false; 17177 if (newScrollY > bottom) { 17178 newScrollY = bottom; 17179 clampedY = true; 17180 } else if (newScrollY < top) { 17181 newScrollY = top; 17182 clampedY = true; 17183 } 17184 17185 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 17186 17187 return clampedX || clampedY; 17188 } 17189 17190 /** 17191 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 17192 * respond to the results of an over-scroll operation. 17193 * 17194 * @param scrollX New X scroll value in pixels 17195 * @param scrollY New Y scroll value in pixels 17196 * @param clampedX True if scrollX was clamped to an over-scroll boundary 17197 * @param clampedY True if scrollY was clamped to an over-scroll boundary 17198 */ 17199 protected void onOverScrolled(int scrollX, int scrollY, 17200 boolean clampedX, boolean clampedY) { 17201 // Intentionally empty. 17202 } 17203 17204 /** 17205 * Returns the over-scroll mode for this view. The result will be 17206 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 17207 * (allow over-scrolling only if the view content is larger than the container), 17208 * or {@link #OVER_SCROLL_NEVER}. 17209 * 17210 * @return This view's over-scroll mode. 17211 */ 17212 public int getOverScrollMode() { 17213 return mOverScrollMode; 17214 } 17215 17216 /** 17217 * Set the over-scroll mode for this view. Valid over-scroll modes are 17218 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 17219 * (allow over-scrolling only if the view content is larger than the container), 17220 * or {@link #OVER_SCROLL_NEVER}. 17221 * 17222 * Setting the over-scroll mode of a view will have an effect only if the 17223 * view is capable of scrolling. 17224 * 17225 * @param overScrollMode The new over-scroll mode for this view. 17226 */ 17227 public void setOverScrollMode(int overScrollMode) { 17228 if (overScrollMode != OVER_SCROLL_ALWAYS && 17229 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 17230 overScrollMode != OVER_SCROLL_NEVER) { 17231 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 17232 } 17233 mOverScrollMode = overScrollMode; 17234 } 17235 17236 /** 17237 * Gets a scale factor that determines the distance the view should scroll 17238 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 17239 * @return The vertical scroll scale factor. 17240 * @hide 17241 */ 17242 protected float getVerticalScrollFactor() { 17243 if (mVerticalScrollFactor == 0) { 17244 TypedValue outValue = new TypedValue(); 17245 if (!mContext.getTheme().resolveAttribute( 17246 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 17247 throw new IllegalStateException( 17248 "Expected theme to define listPreferredItemHeight."); 17249 } 17250 mVerticalScrollFactor = outValue.getDimension( 17251 mContext.getResources().getDisplayMetrics()); 17252 } 17253 return mVerticalScrollFactor; 17254 } 17255 17256 /** 17257 * Gets a scale factor that determines the distance the view should scroll 17258 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 17259 * @return The horizontal scroll scale factor. 17260 * @hide 17261 */ 17262 protected float getHorizontalScrollFactor() { 17263 // TODO: Should use something else. 17264 return getVerticalScrollFactor(); 17265 } 17266 17267 /** 17268 * Return the value specifying the text direction or policy that was set with 17269 * {@link #setTextDirection(int)}. 17270 * 17271 * @return the defined text direction. It can be one of: 17272 * 17273 * {@link #TEXT_DIRECTION_INHERIT}, 17274 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17275 * {@link #TEXT_DIRECTION_ANY_RTL}, 17276 * {@link #TEXT_DIRECTION_LTR}, 17277 * {@link #TEXT_DIRECTION_RTL}, 17278 * {@link #TEXT_DIRECTION_LOCALE} 17279 * 17280 * @attr ref android.R.styleable#View_textDirection 17281 * 17282 * @hide 17283 */ 17284 @ViewDebug.ExportedProperty(category = "text", mapping = { 17285 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 17286 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 17287 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 17288 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 17289 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 17290 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 17291 }) 17292 public int getRawTextDirection() { 17293 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 17294 } 17295 17296 /** 17297 * Set the text direction. 17298 * 17299 * @param textDirection the direction to set. Should be one of: 17300 * 17301 * {@link #TEXT_DIRECTION_INHERIT}, 17302 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17303 * {@link #TEXT_DIRECTION_ANY_RTL}, 17304 * {@link #TEXT_DIRECTION_LTR}, 17305 * {@link #TEXT_DIRECTION_RTL}, 17306 * {@link #TEXT_DIRECTION_LOCALE} 17307 * 17308 * Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution 17309 * proceeds up the parent chain of the view to get the value. If there is no parent, then it will 17310 * return the default {@link #TEXT_DIRECTION_FIRST_STRONG}. 17311 * 17312 * @attr ref android.R.styleable#View_textDirection 17313 */ 17314 public void setTextDirection(int textDirection) { 17315 if (getRawTextDirection() != textDirection) { 17316 // Reset the current text direction and the resolved one 17317 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 17318 resetResolvedTextDirection(); 17319 // Set the new text direction 17320 mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK); 17321 // Do resolution 17322 resolveTextDirection(); 17323 // Notify change 17324 onRtlPropertiesChanged(getLayoutDirection()); 17325 // Refresh 17326 requestLayout(); 17327 invalidate(true); 17328 } 17329 } 17330 17331 /** 17332 * Return the resolved text direction. 17333 * 17334 * @return the resolved text direction. Returns one of: 17335 * 17336 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17337 * {@link #TEXT_DIRECTION_ANY_RTL}, 17338 * {@link #TEXT_DIRECTION_LTR}, 17339 * {@link #TEXT_DIRECTION_RTL}, 17340 * {@link #TEXT_DIRECTION_LOCALE} 17341 * 17342 * @attr ref android.R.styleable#View_textDirection 17343 */ 17344 @ViewDebug.ExportedProperty(category = "text", mapping = { 17345 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 17346 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 17347 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 17348 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 17349 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 17350 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 17351 }) 17352 public int getTextDirection() { 17353 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 17354 } 17355 17356 /** 17357 * Resolve the text direction. 17358 * 17359 * @return true if resolution has been done, false otherwise. 17360 * 17361 * @hide 17362 */ 17363 public boolean resolveTextDirection() { 17364 // Reset any previous text direction resolution 17365 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17366 17367 if (hasRtlSupport()) { 17368 // Set resolved text direction flag depending on text direction flag 17369 final int textDirection = getRawTextDirection(); 17370 switch(textDirection) { 17371 case TEXT_DIRECTION_INHERIT: 17372 if (!canResolveTextDirection()) { 17373 // We cannot do the resolution if there is no parent, so use the default one 17374 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17375 // Resolution will need to happen again later 17376 return false; 17377 } 17378 17379 // Parent has not yet resolved, so we still return the default 17380 try { 17381 if (!mParent.isTextDirectionResolved()) { 17382 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17383 // Resolution will need to happen again later 17384 return false; 17385 } 17386 } catch (AbstractMethodError e) { 17387 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17388 " does not fully implement ViewParent", e); 17389 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED | 17390 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17391 return true; 17392 } 17393 17394 // Set current resolved direction to the same value as the parent's one 17395 int parentResolvedDirection; 17396 try { 17397 parentResolvedDirection = mParent.getTextDirection(); 17398 } catch (AbstractMethodError e) { 17399 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17400 " does not fully implement ViewParent", e); 17401 parentResolvedDirection = TEXT_DIRECTION_LTR; 17402 } 17403 switch (parentResolvedDirection) { 17404 case TEXT_DIRECTION_FIRST_STRONG: 17405 case TEXT_DIRECTION_ANY_RTL: 17406 case TEXT_DIRECTION_LTR: 17407 case TEXT_DIRECTION_RTL: 17408 case TEXT_DIRECTION_LOCALE: 17409 mPrivateFlags2 |= 17410 (parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17411 break; 17412 default: 17413 // Default resolved direction is "first strong" heuristic 17414 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17415 } 17416 break; 17417 case TEXT_DIRECTION_FIRST_STRONG: 17418 case TEXT_DIRECTION_ANY_RTL: 17419 case TEXT_DIRECTION_LTR: 17420 case TEXT_DIRECTION_RTL: 17421 case TEXT_DIRECTION_LOCALE: 17422 // Resolved direction is the same as text direction 17423 mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17424 break; 17425 default: 17426 // Default resolved direction is "first strong" heuristic 17427 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17428 } 17429 } else { 17430 // Default resolved direction is "first strong" heuristic 17431 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17432 } 17433 17434 // Set to resolved 17435 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED; 17436 return true; 17437 } 17438 17439 /** 17440 * Check if text direction resolution can be done. 17441 * 17442 * @return true if text direction resolution can be done otherwise return false. 17443 */ 17444 public boolean canResolveTextDirection() { 17445 switch (getRawTextDirection()) { 17446 case TEXT_DIRECTION_INHERIT: 17447 if (mParent != null) { 17448 try { 17449 return mParent.canResolveTextDirection(); 17450 } catch (AbstractMethodError e) { 17451 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17452 " does not fully implement ViewParent", e); 17453 } 17454 } 17455 return false; 17456 17457 default: 17458 return true; 17459 } 17460 } 17461 17462 /** 17463 * Reset resolved text direction. Text direction will be resolved during a call to 17464 * {@link #onMeasure(int, int)}. 17465 * 17466 * @hide 17467 */ 17468 public void resetResolvedTextDirection() { 17469 // Reset any previous text direction resolution 17470 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17471 // Set to default value 17472 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17473 } 17474 17475 /** 17476 * @return true if text direction is inherited. 17477 * 17478 * @hide 17479 */ 17480 public boolean isTextDirectionInherited() { 17481 return (getRawTextDirection() == TEXT_DIRECTION_INHERIT); 17482 } 17483 17484 /** 17485 * @return true if text direction is resolved. 17486 */ 17487 public boolean isTextDirectionResolved() { 17488 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED; 17489 } 17490 17491 /** 17492 * Return the value specifying the text alignment or policy that was set with 17493 * {@link #setTextAlignment(int)}. 17494 * 17495 * @return the defined text alignment. It can be one of: 17496 * 17497 * {@link #TEXT_ALIGNMENT_INHERIT}, 17498 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17499 * {@link #TEXT_ALIGNMENT_CENTER}, 17500 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17501 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17502 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17503 * {@link #TEXT_ALIGNMENT_VIEW_END} 17504 * 17505 * @attr ref android.R.styleable#View_textAlignment 17506 * 17507 * @hide 17508 */ 17509 @ViewDebug.ExportedProperty(category = "text", mapping = { 17510 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17511 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17512 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17513 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17514 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17515 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17516 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17517 }) 17518 public int getRawTextAlignment() { 17519 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 17520 } 17521 17522 /** 17523 * Set the text alignment. 17524 * 17525 * @param textAlignment The text alignment to set. Should be one of 17526 * 17527 * {@link #TEXT_ALIGNMENT_INHERIT}, 17528 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17529 * {@link #TEXT_ALIGNMENT_CENTER}, 17530 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17531 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17532 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17533 * {@link #TEXT_ALIGNMENT_VIEW_END} 17534 * 17535 * Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution 17536 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 17537 * will return the default {@link #TEXT_ALIGNMENT_GRAVITY}. 17538 * 17539 * @attr ref android.R.styleable#View_textAlignment 17540 */ 17541 public void setTextAlignment(int textAlignment) { 17542 if (textAlignment != getRawTextAlignment()) { 17543 // Reset the current and resolved text alignment 17544 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 17545 resetResolvedTextAlignment(); 17546 // Set the new text alignment 17547 mPrivateFlags2 |= 17548 ((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK); 17549 // Do resolution 17550 resolveTextAlignment(); 17551 // Notify change 17552 onRtlPropertiesChanged(getLayoutDirection()); 17553 // Refresh 17554 requestLayout(); 17555 invalidate(true); 17556 } 17557 } 17558 17559 /** 17560 * Return the resolved text alignment. 17561 * 17562 * @return the resolved text alignment. Returns one of: 17563 * 17564 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17565 * {@link #TEXT_ALIGNMENT_CENTER}, 17566 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17567 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17568 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17569 * {@link #TEXT_ALIGNMENT_VIEW_END} 17570 * 17571 * @attr ref android.R.styleable#View_textAlignment 17572 */ 17573 @ViewDebug.ExportedProperty(category = "text", mapping = { 17574 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17575 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17576 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17577 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17578 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17579 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17580 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17581 }) 17582 public int getTextAlignment() { 17583 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >> 17584 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 17585 } 17586 17587 /** 17588 * Resolve the text alignment. 17589 * 17590 * @return true if resolution has been done, false otherwise. 17591 * 17592 * @hide 17593 */ 17594 public boolean resolveTextAlignment() { 17595 // Reset any previous text alignment resolution 17596 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17597 17598 if (hasRtlSupport()) { 17599 // Set resolved text alignment flag depending on text alignment flag 17600 final int textAlignment = getRawTextAlignment(); 17601 switch (textAlignment) { 17602 case TEXT_ALIGNMENT_INHERIT: 17603 // Check if we can resolve the text alignment 17604 if (!canResolveTextAlignment()) { 17605 // We cannot do the resolution if there is no parent so use the default 17606 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17607 // Resolution will need to happen again later 17608 return false; 17609 } 17610 17611 // Parent has not yet resolved, so we still return the default 17612 try { 17613 if (!mParent.isTextAlignmentResolved()) { 17614 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17615 // Resolution will need to happen again later 17616 return false; 17617 } 17618 } catch (AbstractMethodError e) { 17619 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17620 " does not fully implement ViewParent", e); 17621 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED | 17622 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17623 return true; 17624 } 17625 17626 int parentResolvedTextAlignment; 17627 try { 17628 parentResolvedTextAlignment = mParent.getTextAlignment(); 17629 } catch (AbstractMethodError e) { 17630 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17631 " does not fully implement ViewParent", e); 17632 parentResolvedTextAlignment = TEXT_ALIGNMENT_GRAVITY; 17633 } 17634 switch (parentResolvedTextAlignment) { 17635 case TEXT_ALIGNMENT_GRAVITY: 17636 case TEXT_ALIGNMENT_TEXT_START: 17637 case TEXT_ALIGNMENT_TEXT_END: 17638 case TEXT_ALIGNMENT_CENTER: 17639 case TEXT_ALIGNMENT_VIEW_START: 17640 case TEXT_ALIGNMENT_VIEW_END: 17641 // Resolved text alignment is the same as the parent resolved 17642 // text alignment 17643 mPrivateFlags2 |= 17644 (parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17645 break; 17646 default: 17647 // Use default resolved text alignment 17648 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17649 } 17650 break; 17651 case TEXT_ALIGNMENT_GRAVITY: 17652 case TEXT_ALIGNMENT_TEXT_START: 17653 case TEXT_ALIGNMENT_TEXT_END: 17654 case TEXT_ALIGNMENT_CENTER: 17655 case TEXT_ALIGNMENT_VIEW_START: 17656 case TEXT_ALIGNMENT_VIEW_END: 17657 // Resolved text alignment is the same as text alignment 17658 mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17659 break; 17660 default: 17661 // Use default resolved text alignment 17662 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17663 } 17664 } else { 17665 // Use default resolved text alignment 17666 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17667 } 17668 17669 // Set the resolved 17670 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17671 return true; 17672 } 17673 17674 /** 17675 * Check if text alignment resolution can be done. 17676 * 17677 * @return true if text alignment resolution can be done otherwise return false. 17678 */ 17679 public boolean canResolveTextAlignment() { 17680 switch (getRawTextAlignment()) { 17681 case TEXT_DIRECTION_INHERIT: 17682 if (mParent != null) { 17683 try { 17684 return mParent.canResolveTextAlignment(); 17685 } catch (AbstractMethodError e) { 17686 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17687 " does not fully implement ViewParent", e); 17688 } 17689 } 17690 return false; 17691 17692 default: 17693 return true; 17694 } 17695 } 17696 17697 /** 17698 * Reset resolved text alignment. Text alignment will be resolved during a call to 17699 * {@link #onMeasure(int, int)}. 17700 * 17701 * @hide 17702 */ 17703 public void resetResolvedTextAlignment() { 17704 // Reset any previous text alignment resolution 17705 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17706 // Set to default 17707 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17708 } 17709 17710 /** 17711 * @return true if text alignment is inherited. 17712 * 17713 * @hide 17714 */ 17715 public boolean isTextAlignmentInherited() { 17716 return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT); 17717 } 17718 17719 /** 17720 * @return true if text alignment is resolved. 17721 */ 17722 public boolean isTextAlignmentResolved() { 17723 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17724 } 17725 17726 /** 17727 * Generate a value suitable for use in {@link #setId(int)}. 17728 * This value will not collide with ID values generated at build time by aapt for R.id. 17729 * 17730 * @return a generated ID value 17731 */ 17732 public static int generateViewId() { 17733 for (;;) { 17734 final int result = sNextGeneratedId.get(); 17735 // aapt-generated IDs have the high byte nonzero; clamp to the range under that. 17736 int newValue = result + 1; 17737 if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. 17738 if (sNextGeneratedId.compareAndSet(result, newValue)) { 17739 return result; 17740 } 17741 } 17742 } 17743 17744 // 17745 // Properties 17746 // 17747 /** 17748 * A Property wrapper around the <code>alpha</code> functionality handled by the 17749 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 17750 */ 17751 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 17752 @Override 17753 public void setValue(View object, float value) { 17754 object.setAlpha(value); 17755 } 17756 17757 @Override 17758 public Float get(View object) { 17759 return object.getAlpha(); 17760 } 17761 }; 17762 17763 /** 17764 * A Property wrapper around the <code>translationX</code> functionality handled by the 17765 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 17766 */ 17767 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 17768 @Override 17769 public void setValue(View object, float value) { 17770 object.setTranslationX(value); 17771 } 17772 17773 @Override 17774 public Float get(View object) { 17775 return object.getTranslationX(); 17776 } 17777 }; 17778 17779 /** 17780 * A Property wrapper around the <code>translationY</code> functionality handled by the 17781 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 17782 */ 17783 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 17784 @Override 17785 public void setValue(View object, float value) { 17786 object.setTranslationY(value); 17787 } 17788 17789 @Override 17790 public Float get(View object) { 17791 return object.getTranslationY(); 17792 } 17793 }; 17794 17795 /** 17796 * A Property wrapper around the <code>x</code> functionality handled by the 17797 * {@link View#setX(float)} and {@link View#getX()} methods. 17798 */ 17799 public static final Property<View, Float> X = new FloatProperty<View>("x") { 17800 @Override 17801 public void setValue(View object, float value) { 17802 object.setX(value); 17803 } 17804 17805 @Override 17806 public Float get(View object) { 17807 return object.getX(); 17808 } 17809 }; 17810 17811 /** 17812 * A Property wrapper around the <code>y</code> functionality handled by the 17813 * {@link View#setY(float)} and {@link View#getY()} methods. 17814 */ 17815 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 17816 @Override 17817 public void setValue(View object, float value) { 17818 object.setY(value); 17819 } 17820 17821 @Override 17822 public Float get(View object) { 17823 return object.getY(); 17824 } 17825 }; 17826 17827 /** 17828 * A Property wrapper around the <code>rotation</code> functionality handled by the 17829 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 17830 */ 17831 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 17832 @Override 17833 public void setValue(View object, float value) { 17834 object.setRotation(value); 17835 } 17836 17837 @Override 17838 public Float get(View object) { 17839 return object.getRotation(); 17840 } 17841 }; 17842 17843 /** 17844 * A Property wrapper around the <code>rotationX</code> functionality handled by the 17845 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 17846 */ 17847 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 17848 @Override 17849 public void setValue(View object, float value) { 17850 object.setRotationX(value); 17851 } 17852 17853 @Override 17854 public Float get(View object) { 17855 return object.getRotationX(); 17856 } 17857 }; 17858 17859 /** 17860 * A Property wrapper around the <code>rotationY</code> functionality handled by the 17861 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 17862 */ 17863 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 17864 @Override 17865 public void setValue(View object, float value) { 17866 object.setRotationY(value); 17867 } 17868 17869 @Override 17870 public Float get(View object) { 17871 return object.getRotationY(); 17872 } 17873 }; 17874 17875 /** 17876 * A Property wrapper around the <code>scaleX</code> functionality handled by the 17877 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 17878 */ 17879 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 17880 @Override 17881 public void setValue(View object, float value) { 17882 object.setScaleX(value); 17883 } 17884 17885 @Override 17886 public Float get(View object) { 17887 return object.getScaleX(); 17888 } 17889 }; 17890 17891 /** 17892 * A Property wrapper around the <code>scaleY</code> functionality handled by the 17893 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 17894 */ 17895 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 17896 @Override 17897 public void setValue(View object, float value) { 17898 object.setScaleY(value); 17899 } 17900 17901 @Override 17902 public Float get(View object) { 17903 return object.getScaleY(); 17904 } 17905 }; 17906 17907 /** 17908 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 17909 * Each MeasureSpec represents a requirement for either the width or the height. 17910 * A MeasureSpec is comprised of a size and a mode. There are three possible 17911 * modes: 17912 * <dl> 17913 * <dt>UNSPECIFIED</dt> 17914 * <dd> 17915 * The parent has not imposed any constraint on the child. It can be whatever size 17916 * it wants. 17917 * </dd> 17918 * 17919 * <dt>EXACTLY</dt> 17920 * <dd> 17921 * The parent has determined an exact size for the child. The child is going to be 17922 * given those bounds regardless of how big it wants to be. 17923 * </dd> 17924 * 17925 * <dt>AT_MOST</dt> 17926 * <dd> 17927 * The child can be as large as it wants up to the specified size. 17928 * </dd> 17929 * </dl> 17930 * 17931 * MeasureSpecs are implemented as ints to reduce object allocation. This class 17932 * is provided to pack and unpack the <size, mode> tuple into the int. 17933 */ 17934 public static class MeasureSpec { 17935 private static final int MODE_SHIFT = 30; 17936 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 17937 17938 /** 17939 * Measure specification mode: The parent has not imposed any constraint 17940 * on the child. It can be whatever size it wants. 17941 */ 17942 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 17943 17944 /** 17945 * Measure specification mode: The parent has determined an exact size 17946 * for the child. The child is going to be given those bounds regardless 17947 * of how big it wants to be. 17948 */ 17949 public static final int EXACTLY = 1 << MODE_SHIFT; 17950 17951 /** 17952 * Measure specification mode: The child can be as large as it wants up 17953 * to the specified size. 17954 */ 17955 public static final int AT_MOST = 2 << MODE_SHIFT; 17956 17957 /** 17958 * Creates a measure specification based on the supplied size and mode. 17959 * 17960 * The mode must always be one of the following: 17961 * <ul> 17962 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 17963 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 17964 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 17965 * </ul> 17966 * 17967 * <p><strong>Note:</strong> On API level 17 and lower, makeMeasureSpec's 17968 * implementation was such that the order of arguments did not matter 17969 * and overflow in either value could impact the resulting MeasureSpec. 17970 * {@link android.widget.RelativeLayout} was affected by this bug. 17971 * Apps targeting API levels greater than 17 will get the fixed, more strict 17972 * behavior.</p> 17973 * 17974 * @param size the size of the measure specification 17975 * @param mode the mode of the measure specification 17976 * @return the measure specification based on size and mode 17977 */ 17978 public static int makeMeasureSpec(int size, int mode) { 17979 if (sUseBrokenMakeMeasureSpec) { 17980 return size + mode; 17981 } else { 17982 return (size & ~MODE_MASK) | (mode & MODE_MASK); 17983 } 17984 } 17985 17986 /** 17987 * Extracts the mode from the supplied measure specification. 17988 * 17989 * @param measureSpec the measure specification to extract the mode from 17990 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 17991 * {@link android.view.View.MeasureSpec#AT_MOST} or 17992 * {@link android.view.View.MeasureSpec#EXACTLY} 17993 */ 17994 public static int getMode(int measureSpec) { 17995 return (measureSpec & MODE_MASK); 17996 } 17997 17998 /** 17999 * Extracts the size from the supplied measure specification. 18000 * 18001 * @param measureSpec the measure specification to extract the size from 18002 * @return the size in pixels defined in the supplied measure specification 18003 */ 18004 public static int getSize(int measureSpec) { 18005 return (measureSpec & ~MODE_MASK); 18006 } 18007 18008 static int adjust(int measureSpec, int delta) { 18009 return makeMeasureSpec(getSize(measureSpec + delta), getMode(measureSpec)); 18010 } 18011 18012 /** 18013 * Returns a String representation of the specified measure 18014 * specification. 18015 * 18016 * @param measureSpec the measure specification to convert to a String 18017 * @return a String with the following format: "MeasureSpec: MODE SIZE" 18018 */ 18019 public static String toString(int measureSpec) { 18020 int mode = getMode(measureSpec); 18021 int size = getSize(measureSpec); 18022 18023 StringBuilder sb = new StringBuilder("MeasureSpec: "); 18024 18025 if (mode == UNSPECIFIED) 18026 sb.append("UNSPECIFIED "); 18027 else if (mode == EXACTLY) 18028 sb.append("EXACTLY "); 18029 else if (mode == AT_MOST) 18030 sb.append("AT_MOST "); 18031 else 18032 sb.append(mode).append(" "); 18033 18034 sb.append(size); 18035 return sb.toString(); 18036 } 18037 } 18038 18039 class CheckForLongPress implements Runnable { 18040 18041 private int mOriginalWindowAttachCount; 18042 18043 public void run() { 18044 if (isPressed() && (mParent != null) 18045 && mOriginalWindowAttachCount == mWindowAttachCount) { 18046 if (performLongClick()) { 18047 mHasPerformedLongPress = true; 18048 } 18049 } 18050 } 18051 18052 public void rememberWindowAttachCount() { 18053 mOriginalWindowAttachCount = mWindowAttachCount; 18054 } 18055 } 18056 18057 private final class CheckForTap implements Runnable { 18058 public void run() { 18059 mPrivateFlags &= ~PFLAG_PREPRESSED; 18060 setPressed(true); 18061 checkForLongClick(ViewConfiguration.getTapTimeout()); 18062 } 18063 } 18064 18065 private final class PerformClick implements Runnable { 18066 public void run() { 18067 performClick(); 18068 } 18069 } 18070 18071 /** @hide */ 18072 public void hackTurnOffWindowResizeAnim(boolean off) { 18073 mAttachInfo.mTurnOffWindowResizeAnim = off; 18074 } 18075 18076 /** 18077 * This method returns a ViewPropertyAnimator object, which can be used to animate 18078 * specific properties on this View. 18079 * 18080 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 18081 */ 18082 public ViewPropertyAnimator animate() { 18083 if (mAnimator == null) { 18084 mAnimator = new ViewPropertyAnimator(this); 18085 } 18086 return mAnimator; 18087 } 18088 18089 /** 18090 * Set the current Scene that this view is in. The current scene is set only 18091 * on the root view of a scene, not for every view in that hierarchy. This 18092 * information is used by Scene to determine whether there is a previous 18093 * scene which should be exited before the new scene is entered. 18094 * 18095 * @param scene The new scene being set on the view 18096 * 18097 * @hide 18098 */ 18099 public void setCurrentScene(Scene scene) { 18100 mCurrentScene = scene; 18101 } 18102 18103 /** 18104 * Gets the current {@link Scene} set on this view. A scene is set on a view 18105 * only if that view is the scene root. 18106 * 18107 * @return The current Scene set on this view. A value of null indicates that 18108 * no Scene is current set. 18109 */ 18110 public Scene getCurrentScene() { 18111 return mCurrentScene; 18112 } 18113 18114 /** 18115 * Interface definition for a callback to be invoked when a hardware key event is 18116 * dispatched to this view. The callback will be invoked before the key event is 18117 * given to the view. This is only useful for hardware keyboards; a software input 18118 * method has no obligation to trigger this listener. 18119 */ 18120 public interface OnKeyListener { 18121 /** 18122 * Called when a hardware key is dispatched to a view. This allows listeners to 18123 * get a chance to respond before the target view. 18124 * <p>Key presses in software keyboards will generally NOT trigger this method, 18125 * although some may elect to do so in some situations. Do not assume a 18126 * software input method has to be key-based; even if it is, it may use key presses 18127 * in a different way than you expect, so there is no way to reliably catch soft 18128 * input key presses. 18129 * 18130 * @param v The view the key has been dispatched to. 18131 * @param keyCode The code for the physical key that was pressed 18132 * @param event The KeyEvent object containing full information about 18133 * the event. 18134 * @return True if the listener has consumed the event, false otherwise. 18135 */ 18136 boolean onKey(View v, int keyCode, KeyEvent event); 18137 } 18138 18139 /** 18140 * Interface definition for a callback to be invoked when a touch event is 18141 * dispatched to this view. The callback will be invoked before the touch 18142 * event is given to the view. 18143 */ 18144 public interface OnTouchListener { 18145 /** 18146 * Called when a touch event is dispatched to a view. This allows listeners to 18147 * get a chance to respond before the target view. 18148 * 18149 * @param v The view the touch event has been dispatched to. 18150 * @param event The MotionEvent object containing full information about 18151 * the event. 18152 * @return True if the listener has consumed the event, false otherwise. 18153 */ 18154 boolean onTouch(View v, MotionEvent event); 18155 } 18156 18157 /** 18158 * Interface definition for a callback to be invoked when a hover event is 18159 * dispatched to this view. The callback will be invoked before the hover 18160 * event is given to the view. 18161 */ 18162 public interface OnHoverListener { 18163 /** 18164 * Called when a hover event is dispatched to a view. This allows listeners to 18165 * get a chance to respond before the target view. 18166 * 18167 * @param v The view the hover event has been dispatched to. 18168 * @param event The MotionEvent object containing full information about 18169 * the event. 18170 * @return True if the listener has consumed the event, false otherwise. 18171 */ 18172 boolean onHover(View v, MotionEvent event); 18173 } 18174 18175 /** 18176 * Interface definition for a callback to be invoked when a generic motion event is 18177 * dispatched to this view. The callback will be invoked before the generic motion 18178 * event is given to the view. 18179 */ 18180 public interface OnGenericMotionListener { 18181 /** 18182 * Called when a generic motion event is dispatched to a view. This allows listeners to 18183 * get a chance to respond before the target view. 18184 * 18185 * @param v The view the generic motion event has been dispatched to. 18186 * @param event The MotionEvent object containing full information about 18187 * the event. 18188 * @return True if the listener has consumed the event, false otherwise. 18189 */ 18190 boolean onGenericMotion(View v, MotionEvent event); 18191 } 18192 18193 /** 18194 * Interface definition for a callback to be invoked when a view has been clicked and held. 18195 */ 18196 public interface OnLongClickListener { 18197 /** 18198 * Called when a view has been clicked and held. 18199 * 18200 * @param v The view that was clicked and held. 18201 * 18202 * @return true if the callback consumed the long click, false otherwise. 18203 */ 18204 boolean onLongClick(View v); 18205 } 18206 18207 /** 18208 * Interface definition for a callback to be invoked when a drag is being dispatched 18209 * to this view. The callback will be invoked before the hosting view's own 18210 * onDrag(event) method. If the listener wants to fall back to the hosting view's 18211 * onDrag(event) behavior, it should return 'false' from this callback. 18212 * 18213 * <div class="special reference"> 18214 * <h3>Developer Guides</h3> 18215 * <p>For a guide to implementing drag and drop features, read the 18216 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 18217 * </div> 18218 */ 18219 public interface OnDragListener { 18220 /** 18221 * Called when a drag event is dispatched to a view. This allows listeners 18222 * to get a chance to override base View behavior. 18223 * 18224 * @param v The View that received the drag event. 18225 * @param event The {@link android.view.DragEvent} object for the drag event. 18226 * @return {@code true} if the drag event was handled successfully, or {@code false} 18227 * if the drag event was not handled. Note that {@code false} will trigger the View 18228 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 18229 */ 18230 boolean onDrag(View v, DragEvent event); 18231 } 18232 18233 /** 18234 * Interface definition for a callback to be invoked when the focus state of 18235 * a view changed. 18236 */ 18237 public interface OnFocusChangeListener { 18238 /** 18239 * Called when the focus state of a view has changed. 18240 * 18241 * @param v The view whose state has changed. 18242 * @param hasFocus The new focus state of v. 18243 */ 18244 void onFocusChange(View v, boolean hasFocus); 18245 } 18246 18247 /** 18248 * Interface definition for a callback to be invoked when a view is clicked. 18249 */ 18250 public interface OnClickListener { 18251 /** 18252 * Called when a view has been clicked. 18253 * 18254 * @param v The view that was clicked. 18255 */ 18256 void onClick(View v); 18257 } 18258 18259 /** 18260 * Interface definition for a callback to be invoked when the context menu 18261 * for this view is being built. 18262 */ 18263 public interface OnCreateContextMenuListener { 18264 /** 18265 * Called when the context menu for this view is being built. It is not 18266 * safe to hold onto the menu after this method returns. 18267 * 18268 * @param menu The context menu that is being built 18269 * @param v The view for which the context menu is being built 18270 * @param menuInfo Extra information about the item for which the 18271 * context menu should be shown. This information will vary 18272 * depending on the class of v. 18273 */ 18274 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 18275 } 18276 18277 /** 18278 * Interface definition for a callback to be invoked when the status bar changes 18279 * visibility. This reports <strong>global</strong> changes to the system UI 18280 * state, not what the application is requesting. 18281 * 18282 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 18283 */ 18284 public interface OnSystemUiVisibilityChangeListener { 18285 /** 18286 * Called when the status bar changes visibility because of a call to 18287 * {@link View#setSystemUiVisibility(int)}. 18288 * 18289 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 18290 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 18291 * This tells you the <strong>global</strong> state of these UI visibility 18292 * flags, not what your app is currently applying. 18293 */ 18294 public void onSystemUiVisibilityChange(int visibility); 18295 } 18296 18297 /** 18298 * Interface definition for a callback to be invoked when this view is attached 18299 * or detached from its window. 18300 */ 18301 public interface OnAttachStateChangeListener { 18302 /** 18303 * Called when the view is attached to a window. 18304 * @param v The view that was attached 18305 */ 18306 public void onViewAttachedToWindow(View v); 18307 /** 18308 * Called when the view is detached from a window. 18309 * @param v The view that was detached 18310 */ 18311 public void onViewDetachedFromWindow(View v); 18312 } 18313 18314 private final class UnsetPressedState implements Runnable { 18315 public void run() { 18316 setPressed(false); 18317 } 18318 } 18319 18320 /** 18321 * Base class for derived classes that want to save and restore their own 18322 * state in {@link android.view.View#onSaveInstanceState()}. 18323 */ 18324 public static class BaseSavedState extends AbsSavedState { 18325 /** 18326 * Constructor used when reading from a parcel. Reads the state of the superclass. 18327 * 18328 * @param source 18329 */ 18330 public BaseSavedState(Parcel source) { 18331 super(source); 18332 } 18333 18334 /** 18335 * Constructor called by derived classes when creating their SavedState objects 18336 * 18337 * @param superState The state of the superclass of this view 18338 */ 18339 public BaseSavedState(Parcelable superState) { 18340 super(superState); 18341 } 18342 18343 public static final Parcelable.Creator<BaseSavedState> CREATOR = 18344 new Parcelable.Creator<BaseSavedState>() { 18345 public BaseSavedState createFromParcel(Parcel in) { 18346 return new BaseSavedState(in); 18347 } 18348 18349 public BaseSavedState[] newArray(int size) { 18350 return new BaseSavedState[size]; 18351 } 18352 }; 18353 } 18354 18355 /** 18356 * A set of information given to a view when it is attached to its parent 18357 * window. 18358 */ 18359 static class AttachInfo { 18360 interface Callbacks { 18361 void playSoundEffect(int effectId); 18362 boolean performHapticFeedback(int effectId, boolean always); 18363 } 18364 18365 /** 18366 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 18367 * to a Handler. This class contains the target (View) to invalidate and 18368 * the coordinates of the dirty rectangle. 18369 * 18370 * For performance purposes, this class also implements a pool of up to 18371 * POOL_LIMIT objects that get reused. This reduces memory allocations 18372 * whenever possible. 18373 */ 18374 static class InvalidateInfo { 18375 private static final int POOL_LIMIT = 10; 18376 18377 private static final SynchronizedPool<InvalidateInfo> sPool = 18378 new SynchronizedPool<InvalidateInfo>(POOL_LIMIT); 18379 18380 View target; 18381 18382 int left; 18383 int top; 18384 int right; 18385 int bottom; 18386 18387 public static InvalidateInfo obtain() { 18388 InvalidateInfo instance = sPool.acquire(); 18389 return (instance != null) ? instance : new InvalidateInfo(); 18390 } 18391 18392 public void recycle() { 18393 target = null; 18394 sPool.release(this); 18395 } 18396 } 18397 18398 final IWindowSession mSession; 18399 18400 final IWindow mWindow; 18401 18402 final IBinder mWindowToken; 18403 18404 final Display mDisplay; 18405 18406 final Callbacks mRootCallbacks; 18407 18408 HardwareCanvas mHardwareCanvas; 18409 18410 IWindowId mIWindowId; 18411 WindowId mWindowId; 18412 18413 /** 18414 * The top view of the hierarchy. 18415 */ 18416 View mRootView; 18417 18418 IBinder mPanelParentWindowToken; 18419 Surface mSurface; 18420 18421 boolean mHardwareAccelerated; 18422 boolean mHardwareAccelerationRequested; 18423 HardwareRenderer mHardwareRenderer; 18424 18425 boolean mScreenOn; 18426 18427 /** 18428 * Scale factor used by the compatibility mode 18429 */ 18430 float mApplicationScale; 18431 18432 /** 18433 * Indicates whether the application is in compatibility mode 18434 */ 18435 boolean mScalingRequired; 18436 18437 /** 18438 * If set, ViewRootImpl doesn't use its lame animation for when the window resizes. 18439 */ 18440 boolean mTurnOffWindowResizeAnim; 18441 18442 /** 18443 * Left position of this view's window 18444 */ 18445 int mWindowLeft; 18446 18447 /** 18448 * Top position of this view's window 18449 */ 18450 int mWindowTop; 18451 18452 /** 18453 * Indicates whether views need to use 32-bit drawing caches 18454 */ 18455 boolean mUse32BitDrawingCache; 18456 18457 /** 18458 * For windows that are full-screen but using insets to layout inside 18459 * of the screen areas, these are the current insets to appear inside 18460 * the overscan area of the display. 18461 */ 18462 final Rect mOverscanInsets = new Rect(); 18463 18464 /** 18465 * For windows that are full-screen but using insets to layout inside 18466 * of the screen decorations, these are the current insets for the 18467 * content of the window. 18468 */ 18469 final Rect mContentInsets = new Rect(); 18470 18471 /** 18472 * For windows that are full-screen but using insets to layout inside 18473 * of the screen decorations, these are the current insets for the 18474 * actual visible parts of the window. 18475 */ 18476 final Rect mVisibleInsets = new Rect(); 18477 18478 /** 18479 * The internal insets given by this window. This value is 18480 * supplied by the client (through 18481 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 18482 * be given to the window manager when changed to be used in laying 18483 * out windows behind it. 18484 */ 18485 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 18486 = new ViewTreeObserver.InternalInsetsInfo(); 18487 18488 /** 18489 * All views in the window's hierarchy that serve as scroll containers, 18490 * used to determine if the window can be resized or must be panned 18491 * to adjust for a soft input area. 18492 */ 18493 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 18494 18495 final KeyEvent.DispatcherState mKeyDispatchState 18496 = new KeyEvent.DispatcherState(); 18497 18498 /** 18499 * Indicates whether the view's window currently has the focus. 18500 */ 18501 boolean mHasWindowFocus; 18502 18503 /** 18504 * The current visibility of the window. 18505 */ 18506 int mWindowVisibility; 18507 18508 /** 18509 * Indicates the time at which drawing started to occur. 18510 */ 18511 long mDrawingTime; 18512 18513 /** 18514 * Indicates whether or not ignoring the DIRTY_MASK flags. 18515 */ 18516 boolean mIgnoreDirtyState; 18517 18518 /** 18519 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 18520 * to avoid clearing that flag prematurely. 18521 */ 18522 boolean mSetIgnoreDirtyState = false; 18523 18524 /** 18525 * Indicates whether the view's window is currently in touch mode. 18526 */ 18527 boolean mInTouchMode; 18528 18529 /** 18530 * Indicates that ViewAncestor should trigger a global layout change 18531 * the next time it performs a traversal 18532 */ 18533 boolean mRecomputeGlobalAttributes; 18534 18535 /** 18536 * Always report new attributes at next traversal. 18537 */ 18538 boolean mForceReportNewAttributes; 18539 18540 /** 18541 * Set during a traveral if any views want to keep the screen on. 18542 */ 18543 boolean mKeepScreenOn; 18544 18545 /** 18546 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 18547 */ 18548 int mSystemUiVisibility; 18549 18550 /** 18551 * Hack to force certain system UI visibility flags to be cleared. 18552 */ 18553 int mDisabledSystemUiVisibility; 18554 18555 /** 18556 * Last global system UI visibility reported by the window manager. 18557 */ 18558 int mGlobalSystemUiVisibility; 18559 18560 /** 18561 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 18562 * attached. 18563 */ 18564 boolean mHasSystemUiListeners; 18565 18566 /** 18567 * Set if the window has requested to extend into the overscan region 18568 * via WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN. 18569 */ 18570 boolean mOverscanRequested; 18571 18572 /** 18573 * Set if the visibility of any views has changed. 18574 */ 18575 boolean mViewVisibilityChanged; 18576 18577 /** 18578 * Set to true if a view has been scrolled. 18579 */ 18580 boolean mViewScrollChanged; 18581 18582 /** 18583 * Global to the view hierarchy used as a temporary for dealing with 18584 * x/y points in the transparent region computations. 18585 */ 18586 final int[] mTransparentLocation = new int[2]; 18587 18588 /** 18589 * Global to the view hierarchy used as a temporary for dealing with 18590 * x/y points in the ViewGroup.invalidateChild implementation. 18591 */ 18592 final int[] mInvalidateChildLocation = new int[2]; 18593 18594 18595 /** 18596 * Global to the view hierarchy used as a temporary for dealing with 18597 * x/y location when view is transformed. 18598 */ 18599 final float[] mTmpTransformLocation = new float[2]; 18600 18601 /** 18602 * The view tree observer used to dispatch global events like 18603 * layout, pre-draw, touch mode change, etc. 18604 */ 18605 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 18606 18607 /** 18608 * A Canvas used by the view hierarchy to perform bitmap caching. 18609 */ 18610 Canvas mCanvas; 18611 18612 /** 18613 * The view root impl. 18614 */ 18615 final ViewRootImpl mViewRootImpl; 18616 18617 /** 18618 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 18619 * handler can be used to pump events in the UI events queue. 18620 */ 18621 final Handler mHandler; 18622 18623 /** 18624 * Temporary for use in computing invalidate rectangles while 18625 * calling up the hierarchy. 18626 */ 18627 final Rect mTmpInvalRect = new Rect(); 18628 18629 /** 18630 * Temporary for use in computing hit areas with transformed views 18631 */ 18632 final RectF mTmpTransformRect = new RectF(); 18633 18634 /** 18635 * Temporary for use in transforming invalidation rect 18636 */ 18637 final Matrix mTmpMatrix = new Matrix(); 18638 18639 /** 18640 * Temporary for use in transforming invalidation rect 18641 */ 18642 final Transformation mTmpTransformation = new Transformation(); 18643 18644 /** 18645 * Temporary list for use in collecting focusable descendents of a view. 18646 */ 18647 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 18648 18649 /** 18650 * The id of the window for accessibility purposes. 18651 */ 18652 int mAccessibilityWindowId = View.NO_ID; 18653 18654 /** 18655 * Flags related to accessibility processing. 18656 * 18657 * @see AccessibilityNodeInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS 18658 * @see AccessibilityNodeInfo#FLAG_REPORT_VIEW_IDS 18659 */ 18660 int mAccessibilityFetchFlags; 18661 18662 /** 18663 * The drawable for highlighting accessibility focus. 18664 */ 18665 Drawable mAccessibilityFocusDrawable; 18666 18667 /** 18668 * Show where the margins, bounds and layout bounds are for each view. 18669 */ 18670 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 18671 18672 /** 18673 * Point used to compute visible regions. 18674 */ 18675 final Point mPoint = new Point(); 18676 18677 /** 18678 * Used to track which View originated a requestLayout() call, used when 18679 * requestLayout() is called during layout. 18680 */ 18681 View mViewRequestingLayout; 18682 18683 /** 18684 * Creates a new set of attachment information with the specified 18685 * events handler and thread. 18686 * 18687 * @param handler the events handler the view must use 18688 */ 18689 AttachInfo(IWindowSession session, IWindow window, Display display, 18690 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 18691 mSession = session; 18692 mWindow = window; 18693 mWindowToken = window.asBinder(); 18694 mDisplay = display; 18695 mViewRootImpl = viewRootImpl; 18696 mHandler = handler; 18697 mRootCallbacks = effectPlayer; 18698 } 18699 } 18700 18701 /** 18702 * <p>ScrollabilityCache holds various fields used by a View when scrolling 18703 * is supported. This avoids keeping too many unused fields in most 18704 * instances of View.</p> 18705 */ 18706 private static class ScrollabilityCache implements Runnable { 18707 18708 /** 18709 * Scrollbars are not visible 18710 */ 18711 public static final int OFF = 0; 18712 18713 /** 18714 * Scrollbars are visible 18715 */ 18716 public static final int ON = 1; 18717 18718 /** 18719 * Scrollbars are fading away 18720 */ 18721 public static final int FADING = 2; 18722 18723 public boolean fadeScrollBars; 18724 18725 public int fadingEdgeLength; 18726 public int scrollBarDefaultDelayBeforeFade; 18727 public int scrollBarFadeDuration; 18728 18729 public int scrollBarSize; 18730 public ScrollBarDrawable scrollBar; 18731 public float[] interpolatorValues; 18732 public View host; 18733 18734 public final Paint paint; 18735 public final Matrix matrix; 18736 public Shader shader; 18737 18738 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 18739 18740 private static final float[] OPAQUE = { 255 }; 18741 private static final float[] TRANSPARENT = { 0.0f }; 18742 18743 /** 18744 * When fading should start. This time moves into the future every time 18745 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 18746 */ 18747 public long fadeStartTime; 18748 18749 18750 /** 18751 * The current state of the scrollbars: ON, OFF, or FADING 18752 */ 18753 public int state = OFF; 18754 18755 private int mLastColor; 18756 18757 public ScrollabilityCache(ViewConfiguration configuration, View host) { 18758 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 18759 scrollBarSize = configuration.getScaledScrollBarSize(); 18760 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 18761 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 18762 18763 paint = new Paint(); 18764 matrix = new Matrix(); 18765 // use use a height of 1, and then wack the matrix each time we 18766 // actually use it. 18767 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18768 paint.setShader(shader); 18769 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18770 18771 this.host = host; 18772 } 18773 18774 public void setFadeColor(int color) { 18775 if (color != mLastColor) { 18776 mLastColor = color; 18777 18778 if (color != 0) { 18779 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 18780 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 18781 paint.setShader(shader); 18782 // Restore the default transfer mode (src_over) 18783 paint.setXfermode(null); 18784 } else { 18785 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18786 paint.setShader(shader); 18787 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18788 } 18789 } 18790 } 18791 18792 public void run() { 18793 long now = AnimationUtils.currentAnimationTimeMillis(); 18794 if (now >= fadeStartTime) { 18795 18796 // the animation fades the scrollbars out by changing 18797 // the opacity (alpha) from fully opaque to fully 18798 // transparent 18799 int nextFrame = (int) now; 18800 int framesCount = 0; 18801 18802 Interpolator interpolator = scrollBarInterpolator; 18803 18804 // Start opaque 18805 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 18806 18807 // End transparent 18808 nextFrame += scrollBarFadeDuration; 18809 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 18810 18811 state = FADING; 18812 18813 // Kick off the fade animation 18814 host.invalidate(true); 18815 } 18816 } 18817 } 18818 18819 /** 18820 * Resuable callback for sending 18821 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 18822 */ 18823 private class SendViewScrolledAccessibilityEvent implements Runnable { 18824 public volatile boolean mIsPending; 18825 18826 public void run() { 18827 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 18828 mIsPending = false; 18829 } 18830 } 18831 18832 /** 18833 * <p> 18834 * This class represents a delegate that can be registered in a {@link View} 18835 * to enhance accessibility support via composition rather via inheritance. 18836 * It is specifically targeted to widget developers that extend basic View 18837 * classes i.e. classes in package android.view, that would like their 18838 * applications to be backwards compatible. 18839 * </p> 18840 * <div class="special reference"> 18841 * <h3>Developer Guides</h3> 18842 * <p>For more information about making applications accessible, read the 18843 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 18844 * developer guide.</p> 18845 * </div> 18846 * <p> 18847 * A scenario in which a developer would like to use an accessibility delegate 18848 * is overriding a method introduced in a later API version then the minimal API 18849 * version supported by the application. For example, the method 18850 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 18851 * in API version 4 when the accessibility APIs were first introduced. If a 18852 * developer would like his application to run on API version 4 devices (assuming 18853 * all other APIs used by the application are version 4 or lower) and take advantage 18854 * of this method, instead of overriding the method which would break the application's 18855 * backwards compatibility, he can override the corresponding method in this 18856 * delegate and register the delegate in the target View if the API version of 18857 * the system is high enough i.e. the API version is same or higher to the API 18858 * version that introduced 18859 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 18860 * </p> 18861 * <p> 18862 * Here is an example implementation: 18863 * </p> 18864 * <code><pre><p> 18865 * if (Build.VERSION.SDK_INT >= 14) { 18866 * // If the API version is equal of higher than the version in 18867 * // which onInitializeAccessibilityNodeInfo was introduced we 18868 * // register a delegate with a customized implementation. 18869 * View view = findViewById(R.id.view_id); 18870 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 18871 * public void onInitializeAccessibilityNodeInfo(View host, 18872 * AccessibilityNodeInfo info) { 18873 * // Let the default implementation populate the info. 18874 * super.onInitializeAccessibilityNodeInfo(host, info); 18875 * // Set some other information. 18876 * info.setEnabled(host.isEnabled()); 18877 * } 18878 * }); 18879 * } 18880 * </code></pre></p> 18881 * <p> 18882 * This delegate contains methods that correspond to the accessibility methods 18883 * in View. If a delegate has been specified the implementation in View hands 18884 * off handling to the corresponding method in this delegate. The default 18885 * implementation the delegate methods behaves exactly as the corresponding 18886 * method in View for the case of no accessibility delegate been set. Hence, 18887 * to customize the behavior of a View method, clients can override only the 18888 * corresponding delegate method without altering the behavior of the rest 18889 * accessibility related methods of the host view. 18890 * </p> 18891 */ 18892 public static class AccessibilityDelegate { 18893 18894 /** 18895 * Sends an accessibility event of the given type. If accessibility is not 18896 * enabled this method has no effect. 18897 * <p> 18898 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 18899 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 18900 * been set. 18901 * </p> 18902 * 18903 * @param host The View hosting the delegate. 18904 * @param eventType The type of the event to send. 18905 * 18906 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 18907 */ 18908 public void sendAccessibilityEvent(View host, int eventType) { 18909 host.sendAccessibilityEventInternal(eventType); 18910 } 18911 18912 /** 18913 * Performs the specified accessibility action on the view. For 18914 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 18915 * <p> 18916 * The default implementation behaves as 18917 * {@link View#performAccessibilityAction(int, Bundle) 18918 * View#performAccessibilityAction(int, Bundle)} for the case of 18919 * no accessibility delegate been set. 18920 * </p> 18921 * 18922 * @param action The action to perform. 18923 * @return Whether the action was performed. 18924 * 18925 * @see View#performAccessibilityAction(int, Bundle) 18926 * View#performAccessibilityAction(int, Bundle) 18927 */ 18928 public boolean performAccessibilityAction(View host, int action, Bundle args) { 18929 return host.performAccessibilityActionInternal(action, args); 18930 } 18931 18932 /** 18933 * Sends an accessibility event. This method behaves exactly as 18934 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 18935 * empty {@link AccessibilityEvent} and does not perform a check whether 18936 * accessibility is enabled. 18937 * <p> 18938 * The default implementation behaves as 18939 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18940 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 18941 * the case of no accessibility delegate been set. 18942 * </p> 18943 * 18944 * @param host The View hosting the delegate. 18945 * @param event The event to send. 18946 * 18947 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18948 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18949 */ 18950 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 18951 host.sendAccessibilityEventUncheckedInternal(event); 18952 } 18953 18954 /** 18955 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 18956 * to its children for adding their text content to the event. 18957 * <p> 18958 * The default implementation behaves as 18959 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18960 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 18961 * the case of no accessibility delegate been set. 18962 * </p> 18963 * 18964 * @param host The View hosting the delegate. 18965 * @param event The event. 18966 * @return True if the event population was completed. 18967 * 18968 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18969 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18970 */ 18971 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18972 return host.dispatchPopulateAccessibilityEventInternal(event); 18973 } 18974 18975 /** 18976 * Gives a chance to the host View to populate the accessibility event with its 18977 * text content. 18978 * <p> 18979 * The default implementation behaves as 18980 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 18981 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 18982 * the case of no accessibility delegate been set. 18983 * </p> 18984 * 18985 * @param host The View hosting the delegate. 18986 * @param event The accessibility event which to populate. 18987 * 18988 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 18989 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 18990 */ 18991 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18992 host.onPopulateAccessibilityEventInternal(event); 18993 } 18994 18995 /** 18996 * Initializes an {@link AccessibilityEvent} with information about the 18997 * the host View which is the event source. 18998 * <p> 18999 * The default implementation behaves as 19000 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 19001 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 19002 * the case of no accessibility delegate been set. 19003 * </p> 19004 * 19005 * @param host The View hosting the delegate. 19006 * @param event The event to initialize. 19007 * 19008 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 19009 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 19010 */ 19011 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 19012 host.onInitializeAccessibilityEventInternal(event); 19013 } 19014 19015 /** 19016 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 19017 * <p> 19018 * The default implementation behaves as 19019 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 19020 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 19021 * the case of no accessibility delegate been set. 19022 * </p> 19023 * 19024 * @param host The View hosting the delegate. 19025 * @param info The instance to initialize. 19026 * 19027 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 19028 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 19029 */ 19030 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 19031 host.onInitializeAccessibilityNodeInfoInternal(info); 19032 } 19033 19034 /** 19035 * Called when a child of the host View has requested sending an 19036 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 19037 * to augment the event. 19038 * <p> 19039 * The default implementation behaves as 19040 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 19041 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 19042 * the case of no accessibility delegate been set. 19043 * </p> 19044 * 19045 * @param host The View hosting the delegate. 19046 * @param child The child which requests sending the event. 19047 * @param event The event to be sent. 19048 * @return True if the event should be sent 19049 * 19050 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 19051 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 19052 */ 19053 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 19054 AccessibilityEvent event) { 19055 return host.onRequestSendAccessibilityEventInternal(child, event); 19056 } 19057 19058 /** 19059 * Gets the provider for managing a virtual view hierarchy rooted at this View 19060 * and reported to {@link android.accessibilityservice.AccessibilityService}s 19061 * that explore the window content. 19062 * <p> 19063 * The default implementation behaves as 19064 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 19065 * the case of no accessibility delegate been set. 19066 * </p> 19067 * 19068 * @return The provider. 19069 * 19070 * @see AccessibilityNodeProvider 19071 */ 19072 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 19073 return null; 19074 } 19075 19076 /** 19077 * Returns an {@link AccessibilityNodeInfo} representing the host view from the 19078 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 19079 * This method is responsible for obtaining an accessibility node info from a 19080 * pool of reusable instances and calling 19081 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on the host 19082 * view to initialize the former. 19083 * <p> 19084 * <strong>Note:</strong> The client is responsible for recycling the obtained 19085 * instance by calling {@link AccessibilityNodeInfo#recycle()} to minimize object 19086 * creation. 19087 * </p> 19088 * <p> 19089 * The default implementation behaves as 19090 * {@link View#createAccessibilityNodeInfo() View#createAccessibilityNodeInfo()} for 19091 * the case of no accessibility delegate been set. 19092 * </p> 19093 * @return A populated {@link AccessibilityNodeInfo}. 19094 * 19095 * @see AccessibilityNodeInfo 19096 * 19097 * @hide 19098 */ 19099 public AccessibilityNodeInfo createAccessibilityNodeInfo(View host) { 19100 return host.createAccessibilityNodeInfoInternal(); 19101 } 19102 } 19103 19104 private class MatchIdPredicate implements Predicate<View> { 19105 public int mId; 19106 19107 @Override 19108 public boolean apply(View view) { 19109 return (view.mID == mId); 19110 } 19111 } 19112 19113 private class MatchLabelForPredicate implements Predicate<View> { 19114 private int mLabeledId; 19115 19116 @Override 19117 public boolean apply(View view) { 19118 return (view.mLabelForId == mLabeledId); 19119 } 19120 } 19121 19122 private class SendViewStateChangedAccessibilityEvent implements Runnable { 19123 private boolean mPosted; 19124 private long mLastEventTimeMillis; 19125 19126 public void run() { 19127 mPosted = false; 19128 mLastEventTimeMillis = SystemClock.uptimeMillis(); 19129 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 19130 AccessibilityEvent event = AccessibilityEvent.obtain(); 19131 event.setEventType(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED); 19132 event.setContentChangeType(AccessibilityEvent.CONTENT_CHANGE_TYPE_NODE); 19133 sendAccessibilityEventUnchecked(event); 19134 } 19135 } 19136 19137 public void runOrPost() { 19138 if (mPosted) { 19139 return; 19140 } 19141 final long timeSinceLastMillis = SystemClock.uptimeMillis() - mLastEventTimeMillis; 19142 final long minEventIntevalMillis = 19143 ViewConfiguration.getSendRecurringAccessibilityEventsInterval(); 19144 if (timeSinceLastMillis >= minEventIntevalMillis) { 19145 removeCallbacks(this); 19146 run(); 19147 } else { 19148 postDelayed(this, minEventIntevalMillis - timeSinceLastMillis); 19149 mPosted = true; 19150 } 19151 } 19152 } 19153 19154 /** 19155 * Dump all private flags in readable format, useful for documentation and 19156 * sanity checking. 19157 */ 19158 private static void dumpFlags() { 19159 final HashMap<String, String> found = Maps.newHashMap(); 19160 try { 19161 for (Field field : View.class.getDeclaredFields()) { 19162 final int modifiers = field.getModifiers(); 19163 if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) { 19164 if (field.getType().equals(int.class)) { 19165 final int value = field.getInt(null); 19166 dumpFlag(found, field.getName(), value); 19167 } else if (field.getType().equals(int[].class)) { 19168 final int[] values = (int[]) field.get(null); 19169 for (int i = 0; i < values.length; i++) { 19170 dumpFlag(found, field.getName() + "[" + i + "]", values[i]); 19171 } 19172 } 19173 } 19174 } 19175 } catch (IllegalAccessException e) { 19176 throw new RuntimeException(e); 19177 } 19178 19179 final ArrayList<String> keys = Lists.newArrayList(); 19180 keys.addAll(found.keySet()); 19181 Collections.sort(keys); 19182 for (String key : keys) { 19183 Log.d(VIEW_LOG_TAG, found.get(key)); 19184 } 19185 } 19186 19187 private static void dumpFlag(HashMap<String, String> found, String name, int value) { 19188 // Sort flags by prefix, then by bits, always keeping unique keys 19189 final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' '); 19190 final int prefix = name.indexOf('_'); 19191 final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name; 19192 final String output = bits + " " + name; 19193 found.put(key, output); 19194 } 19195} 19196