View.java revision c6e8811cb48014d541bc6f85b4b7f92643af8591
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.Interpolator; 28import android.graphics.LinearGradient; 29import android.graphics.Matrix; 30import android.graphics.Paint; 31import android.graphics.PixelFormat; 32import android.graphics.Point; 33import android.graphics.PorterDuff; 34import android.graphics.PorterDuffXfermode; 35import android.graphics.Rect; 36import android.graphics.RectF; 37import android.graphics.Region; 38import android.graphics.Shader; 39import android.graphics.drawable.ColorDrawable; 40import android.graphics.drawable.Drawable; 41import android.os.Handler; 42import android.os.IBinder; 43import android.os.Parcel; 44import android.os.Parcelable; 45import android.os.RemoteException; 46import android.os.SystemClock; 47import android.text.TextUtils; 48import android.util.AttributeSet; 49import android.util.FloatProperty; 50import android.util.LocaleUtil; 51import android.util.Log; 52import android.util.Pool; 53import android.util.Poolable; 54import android.util.PoolableManager; 55import android.util.Pools; 56import android.util.Property; 57import android.util.SparseArray; 58import android.util.TypedValue; 59import android.view.ContextMenu.ContextMenuInfo; 60import android.view.accessibility.AccessibilityEvent; 61import android.view.accessibility.AccessibilityEventSource; 62import android.view.accessibility.AccessibilityManager; 63import android.view.accessibility.AccessibilityNodeInfo; 64import android.view.accessibility.AccessibilityNodeProvider; 65import android.view.animation.Animation; 66import android.view.animation.AnimationUtils; 67import android.view.animation.Transformation; 68import android.view.inputmethod.EditorInfo; 69import android.view.inputmethod.InputConnection; 70import android.view.inputmethod.InputMethodManager; 71import android.widget.ScrollBarDrawable; 72 73import static android.os.Build.VERSION_CODES.*; 74 75import com.android.internal.R; 76import com.android.internal.util.Predicate; 77import com.android.internal.view.menu.MenuBuilder; 78 79import java.lang.ref.WeakReference; 80import java.lang.reflect.InvocationTargetException; 81import java.lang.reflect.Method; 82import java.util.ArrayList; 83import java.util.Arrays; 84import java.util.Locale; 85import java.util.concurrent.CopyOnWriteArrayList; 86 87/** 88 * <p> 89 * This class represents the basic building block for user interface components. A View 90 * occupies a rectangular area on the screen and is responsible for drawing and 91 * event handling. View is the base class for <em>widgets</em>, which are 92 * used to create interactive UI components (buttons, text fields, etc.). The 93 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 94 * are invisible containers that hold other Views (or other ViewGroups) and define 95 * their layout properties. 96 * </p> 97 * 98 * <div class="special reference"> 99 * <h3>Developer Guides</h3> 100 * <p>For information about using this class to develop your application's user interface, 101 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 102 * </div> 103 * 104 * <a name="Using"></a> 105 * <h3>Using Views</h3> 106 * <p> 107 * All of the views in a window are arranged in a single tree. You can add views 108 * either from code or by specifying a tree of views in one or more XML layout 109 * files. There are many specialized subclasses of views that act as controls or 110 * are capable of displaying text, images, or other content. 111 * </p> 112 * <p> 113 * Once you have created a tree of views, there are typically a few types of 114 * common operations you may wish to perform: 115 * <ul> 116 * <li><strong>Set properties:</strong> for example setting the text of a 117 * {@link android.widget.TextView}. The available properties and the methods 118 * that set them will vary among the different subclasses of views. Note that 119 * properties that are known at build time can be set in the XML layout 120 * files.</li> 121 * <li><strong>Set focus:</strong> The framework will handled moving focus in 122 * response to user input. To force focus to a specific view, call 123 * {@link #requestFocus}.</li> 124 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 125 * that will be notified when something interesting happens to the view. For 126 * example, all views will let you set a listener to be notified when the view 127 * gains or loses focus. You can register such a listener using 128 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 129 * Other view subclasses offer more specialized listeners. For example, a Button 130 * exposes a listener to notify clients when the button is clicked.</li> 131 * <li><strong>Set visibility:</strong> You can hide or show views using 132 * {@link #setVisibility(int)}.</li> 133 * </ul> 134 * </p> 135 * <p><em> 136 * Note: The Android framework is responsible for measuring, laying out and 137 * drawing views. You should not call methods that perform these actions on 138 * views yourself unless you are actually implementing a 139 * {@link android.view.ViewGroup}. 140 * </em></p> 141 * 142 * <a name="Lifecycle"></a> 143 * <h3>Implementing a Custom View</h3> 144 * 145 * <p> 146 * To implement a custom view, you will usually begin by providing overrides for 147 * some of the standard methods that the framework calls on all views. You do 148 * not need to override all of these methods. In fact, you can start by just 149 * overriding {@link #onDraw(android.graphics.Canvas)}. 150 * <table border="2" width="85%" align="center" cellpadding="5"> 151 * <thead> 152 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 153 * </thead> 154 * 155 * <tbody> 156 * <tr> 157 * <td rowspan="2">Creation</td> 158 * <td>Constructors</td> 159 * <td>There is a form of the constructor that are called when the view 160 * is created from code and a form that is called when the view is 161 * inflated from a layout file. The second form should parse and apply 162 * any attributes defined in the layout file. 163 * </td> 164 * </tr> 165 * <tr> 166 * <td><code>{@link #onFinishInflate()}</code></td> 167 * <td>Called after a view and all of its children has been inflated 168 * from XML.</td> 169 * </tr> 170 * 171 * <tr> 172 * <td rowspan="3">Layout</td> 173 * <td><code>{@link #onMeasure(int, int)}</code></td> 174 * <td>Called to determine the size requirements for this view and all 175 * of its children. 176 * </td> 177 * </tr> 178 * <tr> 179 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 180 * <td>Called when this view should assign a size and position to all 181 * of its children. 182 * </td> 183 * </tr> 184 * <tr> 185 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 186 * <td>Called when the size of this view has changed. 187 * </td> 188 * </tr> 189 * 190 * <tr> 191 * <td>Drawing</td> 192 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 193 * <td>Called when the view should render its content. 194 * </td> 195 * </tr> 196 * 197 * <tr> 198 * <td rowspan="4">Event processing</td> 199 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 200 * <td>Called when a new key event occurs. 201 * </td> 202 * </tr> 203 * <tr> 204 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 205 * <td>Called when a key up event occurs. 206 * </td> 207 * </tr> 208 * <tr> 209 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 210 * <td>Called when a trackball motion event occurs. 211 * </td> 212 * </tr> 213 * <tr> 214 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 215 * <td>Called when a touch screen motion event occurs. 216 * </td> 217 * </tr> 218 * 219 * <tr> 220 * <td rowspan="2">Focus</td> 221 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 222 * <td>Called when the view gains or loses focus. 223 * </td> 224 * </tr> 225 * 226 * <tr> 227 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 228 * <td>Called when the window containing the view gains or loses focus. 229 * </td> 230 * </tr> 231 * 232 * <tr> 233 * <td rowspan="3">Attaching</td> 234 * <td><code>{@link #onAttachedToWindow()}</code></td> 235 * <td>Called when the view is attached to a window. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td><code>{@link #onDetachedFromWindow}</code></td> 241 * <td>Called when the view is detached from its window. 242 * </td> 243 * </tr> 244 * 245 * <tr> 246 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 247 * <td>Called when the visibility of the window containing the view 248 * has changed. 249 * </td> 250 * </tr> 251 * </tbody> 252 * 253 * </table> 254 * </p> 255 * 256 * <a name="IDs"></a> 257 * <h3>IDs</h3> 258 * Views may have an integer id associated with them. These ids are typically 259 * assigned in the layout XML files, and are used to find specific views within 260 * the view tree. A common pattern is to: 261 * <ul> 262 * <li>Define a Button in the layout file and assign it a unique ID. 263 * <pre> 264 * <Button 265 * android:id="@+id/my_button" 266 * android:layout_width="wrap_content" 267 * android:layout_height="wrap_content" 268 * android:text="@string/my_button_text"/> 269 * </pre></li> 270 * <li>From the onCreate method of an Activity, find the Button 271 * <pre class="prettyprint"> 272 * Button myButton = (Button) findViewById(R.id.my_button); 273 * </pre></li> 274 * </ul> 275 * <p> 276 * View IDs need not be unique throughout the tree, but it is good practice to 277 * ensure that they are at least unique within the part of the tree you are 278 * searching. 279 * </p> 280 * 281 * <a name="Position"></a> 282 * <h3>Position</h3> 283 * <p> 284 * The geometry of a view is that of a rectangle. A view has a location, 285 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 286 * two dimensions, expressed as a width and a height. The unit for location 287 * and dimensions is the pixel. 288 * </p> 289 * 290 * <p> 291 * It is possible to retrieve the location of a view by invoking the methods 292 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 293 * coordinate of the rectangle representing the view. The latter returns the 294 * top, or Y, coordinate of the rectangle representing the view. These methods 295 * both return the location of the view relative to its parent. For instance, 296 * when getLeft() returns 20, that means the view is located 20 pixels to the 297 * right of the left edge of its direct parent. 298 * </p> 299 * 300 * <p> 301 * In addition, several convenience methods are offered to avoid unnecessary 302 * computations, namely {@link #getRight()} and {@link #getBottom()}. 303 * These methods return the coordinates of the right and bottom edges of the 304 * rectangle representing the view. For instance, calling {@link #getRight()} 305 * is similar to the following computation: <code>getLeft() + getWidth()</code> 306 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 307 * </p> 308 * 309 * <a name="SizePaddingMargins"></a> 310 * <h3>Size, padding and margins</h3> 311 * <p> 312 * The size of a view is expressed with a width and a height. A view actually 313 * possess two pairs of width and height values. 314 * </p> 315 * 316 * <p> 317 * The first pair is known as <em>measured width</em> and 318 * <em>measured height</em>. These dimensions define how big a view wants to be 319 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 320 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 321 * and {@link #getMeasuredHeight()}. 322 * </p> 323 * 324 * <p> 325 * The second pair is simply known as <em>width</em> and <em>height</em>, or 326 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 327 * dimensions define the actual size of the view on screen, at drawing time and 328 * after layout. These values may, but do not have to, be different from the 329 * measured width and height. The width and height can be obtained by calling 330 * {@link #getWidth()} and {@link #getHeight()}. 331 * </p> 332 * 333 * <p> 334 * To measure its dimensions, a view takes into account its padding. The padding 335 * is expressed in pixels for the left, top, right and bottom parts of the view. 336 * Padding can be used to offset the content of the view by a specific amount of 337 * pixels. For instance, a left padding of 2 will push the view's content by 338 * 2 pixels to the right of the left edge. Padding can be set using the 339 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 340 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 341 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 342 * {@link #getPaddingEnd()}. 343 * </p> 344 * 345 * <p> 346 * Even though a view can define a padding, it does not provide any support for 347 * margins. However, view groups provide such a support. Refer to 348 * {@link android.view.ViewGroup} and 349 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 350 * </p> 351 * 352 * <a name="Layout"></a> 353 * <h3>Layout</h3> 354 * <p> 355 * Layout is a two pass process: a measure pass and a layout pass. The measuring 356 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 357 * of the view tree. Each view pushes dimension specifications down the tree 358 * during the recursion. At the end of the measure pass, every view has stored 359 * its measurements. The second pass happens in 360 * {@link #layout(int,int,int,int)} and is also top-down. During 361 * this pass each parent is responsible for positioning all of its children 362 * using the sizes computed in the measure pass. 363 * </p> 364 * 365 * <p> 366 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 367 * {@link #getMeasuredHeight()} values must be set, along with those for all of 368 * that view's descendants. A view's measured width and measured height values 369 * must respect the constraints imposed by the view's parents. This guarantees 370 * that at the end of the measure pass, all parents accept all of their 371 * children's measurements. A parent view may call measure() more than once on 372 * its children. For example, the parent may measure each child once with 373 * unspecified dimensions to find out how big they want to be, then call 374 * measure() on them again with actual numbers if the sum of all the children's 375 * unconstrained sizes is too big or too small. 376 * </p> 377 * 378 * <p> 379 * The measure pass uses two classes to communicate dimensions. The 380 * {@link MeasureSpec} class is used by views to tell their parents how they 381 * want to be measured and positioned. The base LayoutParams class just 382 * describes how big the view wants to be for both width and height. For each 383 * dimension, it can specify one of: 384 * <ul> 385 * <li> an exact number 386 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 387 * (minus padding) 388 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 389 * enclose its content (plus padding). 390 * </ul> 391 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 392 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 393 * an X and Y value. 394 * </p> 395 * 396 * <p> 397 * MeasureSpecs are used to push requirements down the tree from parent to 398 * child. A MeasureSpec can be in one of three modes: 399 * <ul> 400 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 401 * of a child view. For example, a LinearLayout may call measure() on its child 402 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 403 * tall the child view wants to be given a width of 240 pixels. 404 * <li>EXACTLY: This is used by the parent to impose an exact size on the 405 * child. The child must use this size, and guarantee that all of its 406 * descendants will fit within this size. 407 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 408 * child. The child must gurantee that it and all of its descendants will fit 409 * within this size. 410 * </ul> 411 * </p> 412 * 413 * <p> 414 * To intiate a layout, call {@link #requestLayout}. This method is typically 415 * called by a view on itself when it believes that is can no longer fit within 416 * its current bounds. 417 * </p> 418 * 419 * <a name="Drawing"></a> 420 * <h3>Drawing</h3> 421 * <p> 422 * Drawing is handled by walking the tree and rendering each view that 423 * intersects the invalid region. Because the tree is traversed in-order, 424 * this means that parents will draw before (i.e., behind) their children, with 425 * siblings drawn in the order they appear in the tree. 426 * If you set a background drawable for a View, then the View will draw it for you 427 * before calling back to its <code>onDraw()</code> method. 428 * </p> 429 * 430 * <p> 431 * Note that the framework will not draw views that are not in the invalid region. 432 * </p> 433 * 434 * <p> 435 * To force a view to draw, call {@link #invalidate()}. 436 * </p> 437 * 438 * <a name="EventHandlingThreading"></a> 439 * <h3>Event Handling and Threading</h3> 440 * <p> 441 * The basic cycle of a view is as follows: 442 * <ol> 443 * <li>An event comes in and is dispatched to the appropriate view. The view 444 * handles the event and notifies any listeners.</li> 445 * <li>If in the course of processing the event, the view's bounds may need 446 * to be changed, the view will call {@link #requestLayout()}.</li> 447 * <li>Similarly, if in the course of processing the event the view's appearance 448 * may need to be changed, the view will call {@link #invalidate()}.</li> 449 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 450 * the framework will take care of measuring, laying out, and drawing the tree 451 * as appropriate.</li> 452 * </ol> 453 * </p> 454 * 455 * <p><em>Note: The entire view tree is single threaded. You must always be on 456 * the UI thread when calling any method on any view.</em> 457 * If you are doing work on other threads and want to update the state of a view 458 * from that thread, you should use a {@link Handler}. 459 * </p> 460 * 461 * <a name="FocusHandling"></a> 462 * <h3>Focus Handling</h3> 463 * <p> 464 * The framework will handle routine focus movement in response to user input. 465 * This includes changing the focus as views are removed or hidden, or as new 466 * views become available. Views indicate their willingness to take focus 467 * through the {@link #isFocusable} method. To change whether a view can take 468 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 469 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 470 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 471 * </p> 472 * <p> 473 * Focus movement is based on an algorithm which finds the nearest neighbor in a 474 * given direction. In rare cases, the default algorithm may not match the 475 * intended behavior of the developer. In these situations, you can provide 476 * explicit overrides by using these XML attributes in the layout file: 477 * <pre> 478 * nextFocusDown 479 * nextFocusLeft 480 * nextFocusRight 481 * nextFocusUp 482 * </pre> 483 * </p> 484 * 485 * 486 * <p> 487 * To get a particular view to take focus, call {@link #requestFocus()}. 488 * </p> 489 * 490 * <a name="TouchMode"></a> 491 * <h3>Touch Mode</h3> 492 * <p> 493 * When a user is navigating a user interface via directional keys such as a D-pad, it is 494 * necessary to give focus to actionable items such as buttons so the user can see 495 * what will take input. If the device has touch capabilities, however, and the user 496 * begins interacting with the interface by touching it, it is no longer necessary to 497 * always highlight, or give focus to, a particular view. This motivates a mode 498 * for interaction named 'touch mode'. 499 * </p> 500 * <p> 501 * For a touch capable device, once the user touches the screen, the device 502 * will enter touch mode. From this point onward, only views for which 503 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 504 * Other views that are touchable, like buttons, will not take focus when touched; they will 505 * only fire the on click listeners. 506 * </p> 507 * <p> 508 * Any time a user hits a directional key, such as a D-pad direction, the view device will 509 * exit touch mode, and find a view to take focus, so that the user may resume interacting 510 * with the user interface without touching the screen again. 511 * </p> 512 * <p> 513 * The touch mode state is maintained across {@link android.app.Activity}s. Call 514 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 515 * </p> 516 * 517 * <a name="Scrolling"></a> 518 * <h3>Scrolling</h3> 519 * <p> 520 * The framework provides basic support for views that wish to internally 521 * scroll their content. This includes keeping track of the X and Y scroll 522 * offset as well as mechanisms for drawing scrollbars. See 523 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 524 * {@link #awakenScrollBars()} for more details. 525 * </p> 526 * 527 * <a name="Tags"></a> 528 * <h3>Tags</h3> 529 * <p> 530 * Unlike IDs, tags are not used to identify views. Tags are essentially an 531 * extra piece of information that can be associated with a view. They are most 532 * often used as a convenience to store data related to views in the views 533 * themselves rather than by putting them in a separate structure. 534 * </p> 535 * 536 * <a name="Animation"></a> 537 * <h3>Animation</h3> 538 * <p> 539 * You can attach an {@link Animation} object to a view using 540 * {@link #setAnimation(Animation)} or 541 * {@link #startAnimation(Animation)}. The animation can alter the scale, 542 * rotation, translation and alpha of a view over time. If the animation is 543 * attached to a view that has children, the animation will affect the entire 544 * subtree rooted by that node. When an animation is started, the framework will 545 * take care of redrawing the appropriate views until the animation completes. 546 * </p> 547 * <p> 548 * Starting with Android 3.0, the preferred way of animating views is to use the 549 * {@link android.animation} package APIs. 550 * </p> 551 * 552 * <a name="Security"></a> 553 * <h3>Security</h3> 554 * <p> 555 * Sometimes it is essential that an application be able to verify that an action 556 * is being performed with the full knowledge and consent of the user, such as 557 * granting a permission request, making a purchase or clicking on an advertisement. 558 * Unfortunately, a malicious application could try to spoof the user into 559 * performing these actions, unaware, by concealing the intended purpose of the view. 560 * As a remedy, the framework offers a touch filtering mechanism that can be used to 561 * improve the security of views that provide access to sensitive functionality. 562 * </p><p> 563 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 564 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 565 * will discard touches that are received whenever the view's window is obscured by 566 * another visible window. As a result, the view will not receive touches whenever a 567 * toast, dialog or other window appears above the view's window. 568 * </p><p> 569 * For more fine-grained control over security, consider overriding the 570 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 571 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 572 * </p> 573 * 574 * @attr ref android.R.styleable#View_alpha 575 * @attr ref android.R.styleable#View_background 576 * @attr ref android.R.styleable#View_clickable 577 * @attr ref android.R.styleable#View_contentDescription 578 * @attr ref android.R.styleable#View_drawingCacheQuality 579 * @attr ref android.R.styleable#View_duplicateParentState 580 * @attr ref android.R.styleable#View_id 581 * @attr ref android.R.styleable#View_requiresFadingEdge 582 * @attr ref android.R.styleable#View_fadingEdgeLength 583 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 584 * @attr ref android.R.styleable#View_fitsSystemWindows 585 * @attr ref android.R.styleable#View_isScrollContainer 586 * @attr ref android.R.styleable#View_focusable 587 * @attr ref android.R.styleable#View_focusableInTouchMode 588 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 589 * @attr ref android.R.styleable#View_keepScreenOn 590 * @attr ref android.R.styleable#View_layerType 591 * @attr ref android.R.styleable#View_longClickable 592 * @attr ref android.R.styleable#View_minHeight 593 * @attr ref android.R.styleable#View_minWidth 594 * @attr ref android.R.styleable#View_nextFocusDown 595 * @attr ref android.R.styleable#View_nextFocusLeft 596 * @attr ref android.R.styleable#View_nextFocusRight 597 * @attr ref android.R.styleable#View_nextFocusUp 598 * @attr ref android.R.styleable#View_onClick 599 * @attr ref android.R.styleable#View_padding 600 * @attr ref android.R.styleable#View_paddingBottom 601 * @attr ref android.R.styleable#View_paddingLeft 602 * @attr ref android.R.styleable#View_paddingRight 603 * @attr ref android.R.styleable#View_paddingTop 604 * @attr ref android.R.styleable#View_paddingStart 605 * @attr ref android.R.styleable#View_paddingEnd 606 * @attr ref android.R.styleable#View_saveEnabled 607 * @attr ref android.R.styleable#View_rotation 608 * @attr ref android.R.styleable#View_rotationX 609 * @attr ref android.R.styleable#View_rotationY 610 * @attr ref android.R.styleable#View_scaleX 611 * @attr ref android.R.styleable#View_scaleY 612 * @attr ref android.R.styleable#View_scrollX 613 * @attr ref android.R.styleable#View_scrollY 614 * @attr ref android.R.styleable#View_scrollbarSize 615 * @attr ref android.R.styleable#View_scrollbarStyle 616 * @attr ref android.R.styleable#View_scrollbars 617 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 618 * @attr ref android.R.styleable#View_scrollbarFadeDuration 619 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 620 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 621 * @attr ref android.R.styleable#View_scrollbarThumbVertical 622 * @attr ref android.R.styleable#View_scrollbarTrackVertical 623 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 624 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 625 * @attr ref android.R.styleable#View_soundEffectsEnabled 626 * @attr ref android.R.styleable#View_tag 627 * @attr ref android.R.styleable#View_transformPivotX 628 * @attr ref android.R.styleable#View_transformPivotY 629 * @attr ref android.R.styleable#View_translationX 630 * @attr ref android.R.styleable#View_translationY 631 * @attr ref android.R.styleable#View_visibility 632 * 633 * @see android.view.ViewGroup 634 */ 635public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 636 AccessibilityEventSource { 637 private static final boolean DBG = false; 638 639 /** 640 * The logging tag used by this class with android.util.Log. 641 */ 642 protected static final String VIEW_LOG_TAG = "View"; 643 644 /** 645 * Used to mark a View that has no ID. 646 */ 647 public static final int NO_ID = -1; 648 649 /** 650 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 651 * calling setFlags. 652 */ 653 private static final int NOT_FOCUSABLE = 0x00000000; 654 655 /** 656 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 657 * setFlags. 658 */ 659 private static final int FOCUSABLE = 0x00000001; 660 661 /** 662 * Mask for use with setFlags indicating bits used for focus. 663 */ 664 private static final int FOCUSABLE_MASK = 0x00000001; 665 666 /** 667 * This view will adjust its padding to fit sytem windows (e.g. status bar) 668 */ 669 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 670 671 /** 672 * This view is visible. 673 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 674 * android:visibility}. 675 */ 676 public static final int VISIBLE = 0x00000000; 677 678 /** 679 * This view is invisible, but it still takes up space for layout purposes. 680 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 681 * android:visibility}. 682 */ 683 public static final int INVISIBLE = 0x00000004; 684 685 /** 686 * This view is invisible, and it doesn't take any space for layout 687 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 688 * android:visibility}. 689 */ 690 public static final int GONE = 0x00000008; 691 692 /** 693 * Mask for use with setFlags indicating bits used for visibility. 694 * {@hide} 695 */ 696 static final int VISIBILITY_MASK = 0x0000000C; 697 698 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 699 700 /** 701 * This view is enabled. Intrepretation varies by subclass. 702 * Use with ENABLED_MASK when calling setFlags. 703 * {@hide} 704 */ 705 static final int ENABLED = 0x00000000; 706 707 /** 708 * This view is disabled. Intrepretation varies by subclass. 709 * Use with ENABLED_MASK when calling setFlags. 710 * {@hide} 711 */ 712 static final int DISABLED = 0x00000020; 713 714 /** 715 * Mask for use with setFlags indicating bits used for indicating whether 716 * this view is enabled 717 * {@hide} 718 */ 719 static final int ENABLED_MASK = 0x00000020; 720 721 /** 722 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 723 * called and further optimizations will be performed. It is okay to have 724 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 725 * {@hide} 726 */ 727 static final int WILL_NOT_DRAW = 0x00000080; 728 729 /** 730 * Mask for use with setFlags indicating bits used for indicating whether 731 * this view is will draw 732 * {@hide} 733 */ 734 static final int DRAW_MASK = 0x00000080; 735 736 /** 737 * <p>This view doesn't show scrollbars.</p> 738 * {@hide} 739 */ 740 static final int SCROLLBARS_NONE = 0x00000000; 741 742 /** 743 * <p>This view shows horizontal scrollbars.</p> 744 * {@hide} 745 */ 746 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 747 748 /** 749 * <p>This view shows vertical scrollbars.</p> 750 * {@hide} 751 */ 752 static final int SCROLLBARS_VERTICAL = 0x00000200; 753 754 /** 755 * <p>Mask for use with setFlags indicating bits used for indicating which 756 * scrollbars are enabled.</p> 757 * {@hide} 758 */ 759 static final int SCROLLBARS_MASK = 0x00000300; 760 761 /** 762 * Indicates that the view should filter touches when its window is obscured. 763 * Refer to the class comments for more information about this security feature. 764 * {@hide} 765 */ 766 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 767 768 // note flag value 0x00000800 is now available for next flags... 769 770 /** 771 * <p>This view doesn't show fading edges.</p> 772 * {@hide} 773 */ 774 static final int FADING_EDGE_NONE = 0x00000000; 775 776 /** 777 * <p>This view shows horizontal fading edges.</p> 778 * {@hide} 779 */ 780 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 781 782 /** 783 * <p>This view shows vertical fading edges.</p> 784 * {@hide} 785 */ 786 static final int FADING_EDGE_VERTICAL = 0x00002000; 787 788 /** 789 * <p>Mask for use with setFlags indicating bits used for indicating which 790 * fading edges are enabled.</p> 791 * {@hide} 792 */ 793 static final int FADING_EDGE_MASK = 0x00003000; 794 795 /** 796 * <p>Indicates this view can be clicked. When clickable, a View reacts 797 * to clicks by notifying the OnClickListener.<p> 798 * {@hide} 799 */ 800 static final int CLICKABLE = 0x00004000; 801 802 /** 803 * <p>Indicates this view is caching its drawing into a bitmap.</p> 804 * {@hide} 805 */ 806 static final int DRAWING_CACHE_ENABLED = 0x00008000; 807 808 /** 809 * <p>Indicates that no icicle should be saved for this view.<p> 810 * {@hide} 811 */ 812 static final int SAVE_DISABLED = 0x000010000; 813 814 /** 815 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 816 * property.</p> 817 * {@hide} 818 */ 819 static final int SAVE_DISABLED_MASK = 0x000010000; 820 821 /** 822 * <p>Indicates that no drawing cache should ever be created for this view.<p> 823 * {@hide} 824 */ 825 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 826 827 /** 828 * <p>Indicates this view can take / keep focus when int touch mode.</p> 829 * {@hide} 830 */ 831 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 832 833 /** 834 * <p>Enables low quality mode for the drawing cache.</p> 835 */ 836 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 837 838 /** 839 * <p>Enables high quality mode for the drawing cache.</p> 840 */ 841 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 842 843 /** 844 * <p>Enables automatic quality mode for the drawing cache.</p> 845 */ 846 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 847 848 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 849 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 850 }; 851 852 /** 853 * <p>Mask for use with setFlags indicating bits used for the cache 854 * quality property.</p> 855 * {@hide} 856 */ 857 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 858 859 /** 860 * <p> 861 * Indicates this view can be long clicked. When long clickable, a View 862 * reacts to long clicks by notifying the OnLongClickListener or showing a 863 * context menu. 864 * </p> 865 * {@hide} 866 */ 867 static final int LONG_CLICKABLE = 0x00200000; 868 869 /** 870 * <p>Indicates that this view gets its drawable states from its direct parent 871 * and ignores its original internal states.</p> 872 * 873 * @hide 874 */ 875 static final int DUPLICATE_PARENT_STATE = 0x00400000; 876 877 /** 878 * The scrollbar style to display the scrollbars inside the content area, 879 * without increasing the padding. The scrollbars will be overlaid with 880 * translucency on the view's content. 881 */ 882 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 883 884 /** 885 * The scrollbar style to display the scrollbars inside the padded area, 886 * increasing the padding of the view. The scrollbars will not overlap the 887 * content area of the view. 888 */ 889 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 890 891 /** 892 * The scrollbar style to display the scrollbars at the edge of the view, 893 * without increasing the padding. The scrollbars will be overlaid with 894 * translucency. 895 */ 896 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 897 898 /** 899 * The scrollbar style to display the scrollbars at the edge of the view, 900 * increasing the padding of the view. The scrollbars will only overlap the 901 * background, if any. 902 */ 903 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 904 905 /** 906 * Mask to check if the scrollbar style is overlay or inset. 907 * {@hide} 908 */ 909 static final int SCROLLBARS_INSET_MASK = 0x01000000; 910 911 /** 912 * Mask to check if the scrollbar style is inside or outside. 913 * {@hide} 914 */ 915 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 916 917 /** 918 * Mask for scrollbar style. 919 * {@hide} 920 */ 921 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 922 923 /** 924 * View flag indicating that the screen should remain on while the 925 * window containing this view is visible to the user. This effectively 926 * takes care of automatically setting the WindowManager's 927 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 928 */ 929 public static final int KEEP_SCREEN_ON = 0x04000000; 930 931 /** 932 * View flag indicating whether this view should have sound effects enabled 933 * for events such as clicking and touching. 934 */ 935 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 936 937 /** 938 * View flag indicating whether this view should have haptic feedback 939 * enabled for events such as long presses. 940 */ 941 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 942 943 /** 944 * <p>Indicates that the view hierarchy should stop saving state when 945 * it reaches this view. If state saving is initiated immediately at 946 * the view, it will be allowed. 947 * {@hide} 948 */ 949 static final int PARENT_SAVE_DISABLED = 0x20000000; 950 951 /** 952 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 953 * {@hide} 954 */ 955 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 956 957 /** 958 * Horizontal direction of this view is from Left to Right. 959 * Use with {@link #setLayoutDirection}. 960 */ 961 public static final int LAYOUT_DIRECTION_LTR = 0x00000000; 962 963 /** 964 * Horizontal direction of this view is from Right to Left. 965 * Use with {@link #setLayoutDirection}. 966 */ 967 public static final int LAYOUT_DIRECTION_RTL = 0x40000000; 968 969 /** 970 * Horizontal direction of this view is inherited from its parent. 971 * Use with {@link #setLayoutDirection}. 972 */ 973 public static final int LAYOUT_DIRECTION_INHERIT = 0x80000000; 974 975 /** 976 * Horizontal direction of this view is from deduced from the default language 977 * script for the locale. Use with {@link #setLayoutDirection}. 978 */ 979 public static final int LAYOUT_DIRECTION_LOCALE = 0xC0000000; 980 981 /** 982 * Mask for use with setFlags indicating bits used for horizontalDirection. 983 * {@hide} 984 */ 985 static final int LAYOUT_DIRECTION_MASK = 0xC0000000; 986 987 /* 988 * Array of horizontal direction flags for mapping attribute "horizontalDirection" to correct 989 * flag value. 990 * {@hide} 991 */ 992 private static final int[] LAYOUT_DIRECTION_FLAGS = {LAYOUT_DIRECTION_LTR, 993 LAYOUT_DIRECTION_RTL, LAYOUT_DIRECTION_INHERIT, LAYOUT_DIRECTION_LOCALE}; 994 995 /** 996 * Default horizontalDirection. 997 * {@hide} 998 */ 999 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1000 1001 /** 1002 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1003 * should add all focusable Views regardless if they are focusable in touch mode. 1004 */ 1005 public static final int FOCUSABLES_ALL = 0x00000000; 1006 1007 /** 1008 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1009 * should add only Views focusable in touch mode. 1010 */ 1011 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1012 1013 /** 1014 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1015 * item. 1016 */ 1017 public static final int FOCUS_BACKWARD = 0x00000001; 1018 1019 /** 1020 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1021 * item. 1022 */ 1023 public static final int FOCUS_FORWARD = 0x00000002; 1024 1025 /** 1026 * Use with {@link #focusSearch(int)}. Move focus to the left. 1027 */ 1028 public static final int FOCUS_LEFT = 0x00000011; 1029 1030 /** 1031 * Use with {@link #focusSearch(int)}. Move focus up. 1032 */ 1033 public static final int FOCUS_UP = 0x00000021; 1034 1035 /** 1036 * Use with {@link #focusSearch(int)}. Move focus to the right. 1037 */ 1038 public static final int FOCUS_RIGHT = 0x00000042; 1039 1040 /** 1041 * Use with {@link #focusSearch(int)}. Move focus down. 1042 */ 1043 public static final int FOCUS_DOWN = 0x00000082; 1044 1045 /** 1046 * Bits of {@link #getMeasuredWidthAndState()} and 1047 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1048 */ 1049 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1050 1051 /** 1052 * Bits of {@link #getMeasuredWidthAndState()} and 1053 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1054 */ 1055 public static final int MEASURED_STATE_MASK = 0xff000000; 1056 1057 /** 1058 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1059 * for functions that combine both width and height into a single int, 1060 * such as {@link #getMeasuredState()} and the childState argument of 1061 * {@link #resolveSizeAndState(int, int, int)}. 1062 */ 1063 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1064 1065 /** 1066 * Bit of {@link #getMeasuredWidthAndState()} and 1067 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1068 * is smaller that the space the view would like to have. 1069 */ 1070 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1071 1072 /** 1073 * Base View state sets 1074 */ 1075 // Singles 1076 /** 1077 * Indicates the view has no states set. States are used with 1078 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1079 * view depending on its state. 1080 * 1081 * @see android.graphics.drawable.Drawable 1082 * @see #getDrawableState() 1083 */ 1084 protected static final int[] EMPTY_STATE_SET; 1085 /** 1086 * Indicates the view is enabled. States are used with 1087 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1088 * view depending on its state. 1089 * 1090 * @see android.graphics.drawable.Drawable 1091 * @see #getDrawableState() 1092 */ 1093 protected static final int[] ENABLED_STATE_SET; 1094 /** 1095 * Indicates the view is focused. States are used with 1096 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1097 * view depending on its state. 1098 * 1099 * @see android.graphics.drawable.Drawable 1100 * @see #getDrawableState() 1101 */ 1102 protected static final int[] FOCUSED_STATE_SET; 1103 /** 1104 * Indicates the view is selected. States are used with 1105 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1106 * view depending on its state. 1107 * 1108 * @see android.graphics.drawable.Drawable 1109 * @see #getDrawableState() 1110 */ 1111 protected static final int[] SELECTED_STATE_SET; 1112 /** 1113 * Indicates the view is pressed. States are used with 1114 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1115 * view depending on its state. 1116 * 1117 * @see android.graphics.drawable.Drawable 1118 * @see #getDrawableState() 1119 * @hide 1120 */ 1121 protected static final int[] PRESSED_STATE_SET; 1122 /** 1123 * Indicates the view's window has focus. States are used with 1124 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1125 * view depending on its state. 1126 * 1127 * @see android.graphics.drawable.Drawable 1128 * @see #getDrawableState() 1129 */ 1130 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1131 // Doubles 1132 /** 1133 * Indicates the view is enabled and has the focus. 1134 * 1135 * @see #ENABLED_STATE_SET 1136 * @see #FOCUSED_STATE_SET 1137 */ 1138 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1139 /** 1140 * Indicates the view is enabled and selected. 1141 * 1142 * @see #ENABLED_STATE_SET 1143 * @see #SELECTED_STATE_SET 1144 */ 1145 protected static final int[] ENABLED_SELECTED_STATE_SET; 1146 /** 1147 * Indicates the view is enabled and that its window has focus. 1148 * 1149 * @see #ENABLED_STATE_SET 1150 * @see #WINDOW_FOCUSED_STATE_SET 1151 */ 1152 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1153 /** 1154 * Indicates the view is focused and selected. 1155 * 1156 * @see #FOCUSED_STATE_SET 1157 * @see #SELECTED_STATE_SET 1158 */ 1159 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1160 /** 1161 * Indicates the view has the focus and that its window has the focus. 1162 * 1163 * @see #FOCUSED_STATE_SET 1164 * @see #WINDOW_FOCUSED_STATE_SET 1165 */ 1166 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1167 /** 1168 * Indicates the view is selected and that its window has the focus. 1169 * 1170 * @see #SELECTED_STATE_SET 1171 * @see #WINDOW_FOCUSED_STATE_SET 1172 */ 1173 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1174 // Triples 1175 /** 1176 * Indicates the view is enabled, focused and selected. 1177 * 1178 * @see #ENABLED_STATE_SET 1179 * @see #FOCUSED_STATE_SET 1180 * @see #SELECTED_STATE_SET 1181 */ 1182 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1183 /** 1184 * Indicates the view is enabled, focused and its window has the focus. 1185 * 1186 * @see #ENABLED_STATE_SET 1187 * @see #FOCUSED_STATE_SET 1188 * @see #WINDOW_FOCUSED_STATE_SET 1189 */ 1190 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1191 /** 1192 * Indicates the view is enabled, selected and its window has the focus. 1193 * 1194 * @see #ENABLED_STATE_SET 1195 * @see #SELECTED_STATE_SET 1196 * @see #WINDOW_FOCUSED_STATE_SET 1197 */ 1198 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1199 /** 1200 * Indicates the view is focused, selected and its window has the focus. 1201 * 1202 * @see #FOCUSED_STATE_SET 1203 * @see #SELECTED_STATE_SET 1204 * @see #WINDOW_FOCUSED_STATE_SET 1205 */ 1206 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1207 /** 1208 * Indicates the view is enabled, focused, selected and its window 1209 * has the focus. 1210 * 1211 * @see #ENABLED_STATE_SET 1212 * @see #FOCUSED_STATE_SET 1213 * @see #SELECTED_STATE_SET 1214 * @see #WINDOW_FOCUSED_STATE_SET 1215 */ 1216 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1217 /** 1218 * Indicates the view is pressed and its window has the focus. 1219 * 1220 * @see #PRESSED_STATE_SET 1221 * @see #WINDOW_FOCUSED_STATE_SET 1222 */ 1223 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1224 /** 1225 * Indicates the view is pressed and selected. 1226 * 1227 * @see #PRESSED_STATE_SET 1228 * @see #SELECTED_STATE_SET 1229 */ 1230 protected static final int[] PRESSED_SELECTED_STATE_SET; 1231 /** 1232 * Indicates the view is pressed, selected and its window has the focus. 1233 * 1234 * @see #PRESSED_STATE_SET 1235 * @see #SELECTED_STATE_SET 1236 * @see #WINDOW_FOCUSED_STATE_SET 1237 */ 1238 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1239 /** 1240 * Indicates the view is pressed and focused. 1241 * 1242 * @see #PRESSED_STATE_SET 1243 * @see #FOCUSED_STATE_SET 1244 */ 1245 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1246 /** 1247 * Indicates the view is pressed, focused and its window has the focus. 1248 * 1249 * @see #PRESSED_STATE_SET 1250 * @see #FOCUSED_STATE_SET 1251 * @see #WINDOW_FOCUSED_STATE_SET 1252 */ 1253 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1254 /** 1255 * Indicates the view is pressed, focused and selected. 1256 * 1257 * @see #PRESSED_STATE_SET 1258 * @see #SELECTED_STATE_SET 1259 * @see #FOCUSED_STATE_SET 1260 */ 1261 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1262 /** 1263 * Indicates the view is pressed, focused, selected and its window has the focus. 1264 * 1265 * @see #PRESSED_STATE_SET 1266 * @see #FOCUSED_STATE_SET 1267 * @see #SELECTED_STATE_SET 1268 * @see #WINDOW_FOCUSED_STATE_SET 1269 */ 1270 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1271 /** 1272 * Indicates the view is pressed and enabled. 1273 * 1274 * @see #PRESSED_STATE_SET 1275 * @see #ENABLED_STATE_SET 1276 */ 1277 protected static final int[] PRESSED_ENABLED_STATE_SET; 1278 /** 1279 * Indicates the view is pressed, enabled and its window has the focus. 1280 * 1281 * @see #PRESSED_STATE_SET 1282 * @see #ENABLED_STATE_SET 1283 * @see #WINDOW_FOCUSED_STATE_SET 1284 */ 1285 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1286 /** 1287 * Indicates the view is pressed, enabled and selected. 1288 * 1289 * @see #PRESSED_STATE_SET 1290 * @see #ENABLED_STATE_SET 1291 * @see #SELECTED_STATE_SET 1292 */ 1293 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1294 /** 1295 * Indicates the view is pressed, enabled, selected and its window has the 1296 * focus. 1297 * 1298 * @see #PRESSED_STATE_SET 1299 * @see #ENABLED_STATE_SET 1300 * @see #SELECTED_STATE_SET 1301 * @see #WINDOW_FOCUSED_STATE_SET 1302 */ 1303 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1304 /** 1305 * Indicates the view is pressed, enabled and focused. 1306 * 1307 * @see #PRESSED_STATE_SET 1308 * @see #ENABLED_STATE_SET 1309 * @see #FOCUSED_STATE_SET 1310 */ 1311 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1312 /** 1313 * Indicates the view is pressed, enabled, focused and its window has the 1314 * focus. 1315 * 1316 * @see #PRESSED_STATE_SET 1317 * @see #ENABLED_STATE_SET 1318 * @see #FOCUSED_STATE_SET 1319 * @see #WINDOW_FOCUSED_STATE_SET 1320 */ 1321 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1322 /** 1323 * Indicates the view is pressed, enabled, focused and selected. 1324 * 1325 * @see #PRESSED_STATE_SET 1326 * @see #ENABLED_STATE_SET 1327 * @see #SELECTED_STATE_SET 1328 * @see #FOCUSED_STATE_SET 1329 */ 1330 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1331 /** 1332 * Indicates the view is pressed, enabled, focused, selected and its window 1333 * has the focus. 1334 * 1335 * @see #PRESSED_STATE_SET 1336 * @see #ENABLED_STATE_SET 1337 * @see #SELECTED_STATE_SET 1338 * @see #FOCUSED_STATE_SET 1339 * @see #WINDOW_FOCUSED_STATE_SET 1340 */ 1341 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1342 1343 /** 1344 * The order here is very important to {@link #getDrawableState()} 1345 */ 1346 private static final int[][] VIEW_STATE_SETS; 1347 1348 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1349 static final int VIEW_STATE_SELECTED = 1 << 1; 1350 static final int VIEW_STATE_FOCUSED = 1 << 2; 1351 static final int VIEW_STATE_ENABLED = 1 << 3; 1352 static final int VIEW_STATE_PRESSED = 1 << 4; 1353 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1354 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1355 static final int VIEW_STATE_HOVERED = 1 << 7; 1356 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1357 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1358 1359 static final int[] VIEW_STATE_IDS = new int[] { 1360 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1361 R.attr.state_selected, VIEW_STATE_SELECTED, 1362 R.attr.state_focused, VIEW_STATE_FOCUSED, 1363 R.attr.state_enabled, VIEW_STATE_ENABLED, 1364 R.attr.state_pressed, VIEW_STATE_PRESSED, 1365 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1366 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1367 R.attr.state_hovered, VIEW_STATE_HOVERED, 1368 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1369 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED, 1370 }; 1371 1372 static { 1373 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1374 throw new IllegalStateException( 1375 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1376 } 1377 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1378 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1379 int viewState = R.styleable.ViewDrawableStates[i]; 1380 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1381 if (VIEW_STATE_IDS[j] == viewState) { 1382 orderedIds[i * 2] = viewState; 1383 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1384 } 1385 } 1386 } 1387 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1388 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1389 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1390 int numBits = Integer.bitCount(i); 1391 int[] set = new int[numBits]; 1392 int pos = 0; 1393 for (int j = 0; j < orderedIds.length; j += 2) { 1394 if ((i & orderedIds[j+1]) != 0) { 1395 set[pos++] = orderedIds[j]; 1396 } 1397 } 1398 VIEW_STATE_SETS[i] = set; 1399 } 1400 1401 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1402 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1403 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1404 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1405 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1406 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1407 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1408 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1409 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1410 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1411 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1412 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1413 | VIEW_STATE_FOCUSED]; 1414 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1415 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1416 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1417 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1418 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1419 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1420 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1421 | VIEW_STATE_ENABLED]; 1422 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1423 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1424 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1425 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1426 | VIEW_STATE_ENABLED]; 1427 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1428 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1429 | VIEW_STATE_ENABLED]; 1430 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1431 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1432 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1433 1434 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1435 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1436 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1437 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1438 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1439 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1440 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1441 | VIEW_STATE_PRESSED]; 1442 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1443 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1444 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1445 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1446 | VIEW_STATE_PRESSED]; 1447 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1448 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1449 | VIEW_STATE_PRESSED]; 1450 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1451 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1452 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1453 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1454 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1455 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1456 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1457 | VIEW_STATE_PRESSED]; 1458 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1459 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1460 | VIEW_STATE_PRESSED]; 1461 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1462 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1463 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1464 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1465 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1466 | VIEW_STATE_PRESSED]; 1467 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1468 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1469 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1470 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1471 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1472 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1473 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1474 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1475 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1476 | VIEW_STATE_PRESSED]; 1477 } 1478 1479 /** 1480 * Accessibility event types that are dispatched for text population. 1481 */ 1482 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1483 AccessibilityEvent.TYPE_VIEW_CLICKED 1484 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1485 | AccessibilityEvent.TYPE_VIEW_SELECTED 1486 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1487 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1488 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1489 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1490 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1491 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED; 1492 1493 /** 1494 * Temporary Rect currently for use in setBackground(). This will probably 1495 * be extended in the future to hold our own class with more than just 1496 * a Rect. :) 1497 */ 1498 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1499 1500 /** 1501 * Temporary flag, used to enable processing of View properties in the native DisplayList 1502 * object instead of during draw(). Soon to be enabled by default for hardware-accelerated 1503 * apps. 1504 * @hide 1505 */ 1506 protected static final boolean USE_DISPLAY_LIST_PROPERTIES = false; 1507 1508 /** 1509 * Map used to store views' tags. 1510 */ 1511 private SparseArray<Object> mKeyedTags; 1512 1513 /** 1514 * The next available accessiiblity id. 1515 */ 1516 private static int sNextAccessibilityViewId; 1517 1518 /** 1519 * The animation currently associated with this view. 1520 * @hide 1521 */ 1522 protected Animation mCurrentAnimation = null; 1523 1524 /** 1525 * Width as measured during measure pass. 1526 * {@hide} 1527 */ 1528 @ViewDebug.ExportedProperty(category = "measurement") 1529 int mMeasuredWidth; 1530 1531 /** 1532 * Height as measured during measure pass. 1533 * {@hide} 1534 */ 1535 @ViewDebug.ExportedProperty(category = "measurement") 1536 int mMeasuredHeight; 1537 1538 /** 1539 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1540 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1541 * its display list. This flag, used only when hw accelerated, allows us to clear the 1542 * flag while retaining this information until it's needed (at getDisplayList() time and 1543 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1544 * 1545 * {@hide} 1546 */ 1547 boolean mRecreateDisplayList = false; 1548 1549 /** 1550 * The view's identifier. 1551 * {@hide} 1552 * 1553 * @see #setId(int) 1554 * @see #getId() 1555 */ 1556 @ViewDebug.ExportedProperty(resolveId = true) 1557 int mID = NO_ID; 1558 1559 /** 1560 * The stable ID of this view for accessibility purposes. 1561 */ 1562 int mAccessibilityViewId = NO_ID; 1563 1564 /** 1565 * The view's tag. 1566 * {@hide} 1567 * 1568 * @see #setTag(Object) 1569 * @see #getTag() 1570 */ 1571 protected Object mTag; 1572 1573 // for mPrivateFlags: 1574 /** {@hide} */ 1575 static final int WANTS_FOCUS = 0x00000001; 1576 /** {@hide} */ 1577 static final int FOCUSED = 0x00000002; 1578 /** {@hide} */ 1579 static final int SELECTED = 0x00000004; 1580 /** {@hide} */ 1581 static final int IS_ROOT_NAMESPACE = 0x00000008; 1582 /** {@hide} */ 1583 static final int HAS_BOUNDS = 0x00000010; 1584 /** {@hide} */ 1585 static final int DRAWN = 0x00000020; 1586 /** 1587 * When this flag is set, this view is running an animation on behalf of its 1588 * children and should therefore not cancel invalidate requests, even if they 1589 * lie outside of this view's bounds. 1590 * 1591 * {@hide} 1592 */ 1593 static final int DRAW_ANIMATION = 0x00000040; 1594 /** {@hide} */ 1595 static final int SKIP_DRAW = 0x00000080; 1596 /** {@hide} */ 1597 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1598 /** {@hide} */ 1599 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1600 /** {@hide} */ 1601 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1602 /** {@hide} */ 1603 static final int MEASURED_DIMENSION_SET = 0x00000800; 1604 /** {@hide} */ 1605 static final int FORCE_LAYOUT = 0x00001000; 1606 /** {@hide} */ 1607 static final int LAYOUT_REQUIRED = 0x00002000; 1608 1609 private static final int PRESSED = 0x00004000; 1610 1611 /** {@hide} */ 1612 static final int DRAWING_CACHE_VALID = 0x00008000; 1613 /** 1614 * Flag used to indicate that this view should be drawn once more (and only once 1615 * more) after its animation has completed. 1616 * {@hide} 1617 */ 1618 static final int ANIMATION_STARTED = 0x00010000; 1619 1620 private static final int SAVE_STATE_CALLED = 0x00020000; 1621 1622 /** 1623 * Indicates that the View returned true when onSetAlpha() was called and that 1624 * the alpha must be restored. 1625 * {@hide} 1626 */ 1627 static final int ALPHA_SET = 0x00040000; 1628 1629 /** 1630 * Set by {@link #setScrollContainer(boolean)}. 1631 */ 1632 static final int SCROLL_CONTAINER = 0x00080000; 1633 1634 /** 1635 * Set by {@link #setScrollContainer(boolean)}. 1636 */ 1637 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1638 1639 /** 1640 * View flag indicating whether this view was invalidated (fully or partially.) 1641 * 1642 * @hide 1643 */ 1644 static final int DIRTY = 0x00200000; 1645 1646 /** 1647 * View flag indicating whether this view was invalidated by an opaque 1648 * invalidate request. 1649 * 1650 * @hide 1651 */ 1652 static final int DIRTY_OPAQUE = 0x00400000; 1653 1654 /** 1655 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1656 * 1657 * @hide 1658 */ 1659 static final int DIRTY_MASK = 0x00600000; 1660 1661 /** 1662 * Indicates whether the background is opaque. 1663 * 1664 * @hide 1665 */ 1666 static final int OPAQUE_BACKGROUND = 0x00800000; 1667 1668 /** 1669 * Indicates whether the scrollbars are opaque. 1670 * 1671 * @hide 1672 */ 1673 static final int OPAQUE_SCROLLBARS = 0x01000000; 1674 1675 /** 1676 * Indicates whether the view is opaque. 1677 * 1678 * @hide 1679 */ 1680 static final int OPAQUE_MASK = 0x01800000; 1681 1682 /** 1683 * Indicates a prepressed state; 1684 * the short time between ACTION_DOWN and recognizing 1685 * a 'real' press. Prepressed is used to recognize quick taps 1686 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1687 * 1688 * @hide 1689 */ 1690 private static final int PREPRESSED = 0x02000000; 1691 1692 /** 1693 * Indicates whether the view is temporarily detached. 1694 * 1695 * @hide 1696 */ 1697 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1698 1699 /** 1700 * Indicates that we should awaken scroll bars once attached 1701 * 1702 * @hide 1703 */ 1704 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1705 1706 /** 1707 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1708 * @hide 1709 */ 1710 private static final int HOVERED = 0x10000000; 1711 1712 /** 1713 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1714 * for transform operations 1715 * 1716 * @hide 1717 */ 1718 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1719 1720 /** {@hide} */ 1721 static final int ACTIVATED = 0x40000000; 1722 1723 /** 1724 * Indicates that this view was specifically invalidated, not just dirtied because some 1725 * child view was invalidated. The flag is used to determine when we need to recreate 1726 * a view's display list (as opposed to just returning a reference to its existing 1727 * display list). 1728 * 1729 * @hide 1730 */ 1731 static final int INVALIDATED = 0x80000000; 1732 1733 /* Masks for mPrivateFlags2 */ 1734 1735 /** 1736 * Indicates that this view has reported that it can accept the current drag's content. 1737 * Cleared when the drag operation concludes. 1738 * @hide 1739 */ 1740 static final int DRAG_CAN_ACCEPT = 0x00000001; 1741 1742 /** 1743 * Indicates that this view is currently directly under the drag location in a 1744 * drag-and-drop operation involving content that it can accept. Cleared when 1745 * the drag exits the view, or when the drag operation concludes. 1746 * @hide 1747 */ 1748 static final int DRAG_HOVERED = 0x00000002; 1749 1750 /** 1751 * Indicates whether the view layout direction has been resolved and drawn to the 1752 * right-to-left direction. 1753 * 1754 * @hide 1755 */ 1756 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 0x00000004; 1757 1758 /** 1759 * Indicates whether the view layout direction has been resolved. 1760 * 1761 * @hide 1762 */ 1763 static final int LAYOUT_DIRECTION_RESOLVED = 0x00000008; 1764 1765 1766 /** 1767 * Indicates that the view is tracking some sort of transient state 1768 * that the app should not need to be aware of, but that the framework 1769 * should take special care to preserve. 1770 * 1771 * @hide 1772 */ 1773 static final int HAS_TRANSIENT_STATE = 0x00000010; 1774 1775 1776 /* End of masks for mPrivateFlags2 */ 1777 1778 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 1779 1780 /** 1781 * Always allow a user to over-scroll this view, provided it is a 1782 * view that can scroll. 1783 * 1784 * @see #getOverScrollMode() 1785 * @see #setOverScrollMode(int) 1786 */ 1787 public static final int OVER_SCROLL_ALWAYS = 0; 1788 1789 /** 1790 * Allow a user to over-scroll this view only if the content is large 1791 * enough to meaningfully scroll, provided it is a view that can scroll. 1792 * 1793 * @see #getOverScrollMode() 1794 * @see #setOverScrollMode(int) 1795 */ 1796 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1797 1798 /** 1799 * Never allow a user to over-scroll this view. 1800 * 1801 * @see #getOverScrollMode() 1802 * @see #setOverScrollMode(int) 1803 */ 1804 public static final int OVER_SCROLL_NEVER = 2; 1805 1806 /** 1807 * View has requested the system UI (status bar) to be visible (the default). 1808 * 1809 * @see #setSystemUiVisibility(int) 1810 */ 1811 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 1812 1813 /** 1814 * View has requested the system UI to enter an unobtrusive "low profile" mode. 1815 * 1816 * This is for use in games, book readers, video players, or any other "immersive" application 1817 * where the usual system chrome is deemed too distracting. 1818 * 1819 * In low profile mode, the status bar and/or navigation icons may dim. 1820 * 1821 * @see #setSystemUiVisibility(int) 1822 */ 1823 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 1824 1825 /** 1826 * View has requested that the system navigation be temporarily hidden. 1827 * 1828 * This is an even less obtrusive state than that called for by 1829 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 1830 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 1831 * those to disappear. This is useful (in conjunction with the 1832 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 1833 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 1834 * window flags) for displaying content using every last pixel on the display. 1835 * 1836 * There is a limitation: because navigation controls are so important, the least user 1837 * interaction will cause them to reappear immediately. 1838 * 1839 * @see #setSystemUiVisibility(int) 1840 */ 1841 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 1842 1843 /** 1844 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 1845 */ 1846 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 1847 1848 /** 1849 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 1850 */ 1851 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 1852 1853 /** 1854 * @hide 1855 * 1856 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1857 * out of the public fields to keep the undefined bits out of the developer's way. 1858 * 1859 * Flag to make the status bar not expandable. Unless you also 1860 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 1861 */ 1862 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 1863 1864 /** 1865 * @hide 1866 * 1867 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1868 * out of the public fields to keep the undefined bits out of the developer's way. 1869 * 1870 * Flag to hide notification icons and scrolling ticker text. 1871 */ 1872 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 1873 1874 /** 1875 * @hide 1876 * 1877 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1878 * out of the public fields to keep the undefined bits out of the developer's way. 1879 * 1880 * Flag to disable incoming notification alerts. This will not block 1881 * icons, but it will block sound, vibrating and other visual or aural notifications. 1882 */ 1883 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 1884 1885 /** 1886 * @hide 1887 * 1888 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1889 * out of the public fields to keep the undefined bits out of the developer's way. 1890 * 1891 * Flag to hide only the scrolling ticker. Note that 1892 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 1893 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 1894 */ 1895 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 1896 1897 /** 1898 * @hide 1899 * 1900 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1901 * out of the public fields to keep the undefined bits out of the developer's way. 1902 * 1903 * Flag to hide the center system info area. 1904 */ 1905 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 1906 1907 /** 1908 * @hide 1909 * 1910 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1911 * out of the public fields to keep the undefined bits out of the developer's way. 1912 * 1913 * Flag to hide only the home button. Don't use this 1914 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1915 */ 1916 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 1917 1918 /** 1919 * @hide 1920 * 1921 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1922 * out of the public fields to keep the undefined bits out of the developer's way. 1923 * 1924 * Flag to hide only the back button. Don't use this 1925 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1926 */ 1927 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 1928 1929 /** 1930 * @hide 1931 * 1932 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1933 * out of the public fields to keep the undefined bits out of the developer's way. 1934 * 1935 * Flag to hide only the clock. You might use this if your activity has 1936 * its own clock making the status bar's clock redundant. 1937 */ 1938 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 1939 1940 /** 1941 * @hide 1942 * 1943 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1944 * out of the public fields to keep the undefined bits out of the developer's way. 1945 * 1946 * Flag to hide only the recent apps button. Don't use this 1947 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1948 */ 1949 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 1950 1951 /** 1952 * @hide 1953 * 1954 * NOTE: This flag may only be used in subtreeSystemUiVisibility, etc. etc. 1955 * 1956 * This hides HOME and RECENT and is provided for compatibility with interim implementations. 1957 */ 1958 @Deprecated 1959 public static final int STATUS_BAR_DISABLE_NAVIGATION = 1960 STATUS_BAR_DISABLE_HOME | STATUS_BAR_DISABLE_RECENT; 1961 1962 /** 1963 * @hide 1964 */ 1965 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 1966 1967 /** 1968 * These are the system UI flags that can be cleared by events outside 1969 * of an application. Currently this is just the ability to tap on the 1970 * screen while hiding the navigation bar to have it return. 1971 * @hide 1972 */ 1973 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 1974 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION; 1975 1976 /** 1977 * Find views that render the specified text. 1978 * 1979 * @see #findViewsWithText(ArrayList, CharSequence, int) 1980 */ 1981 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 1982 1983 /** 1984 * Find find views that contain the specified content description. 1985 * 1986 * @see #findViewsWithText(ArrayList, CharSequence, int) 1987 */ 1988 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 1989 1990 /** 1991 * Find views that contain {@link AccessibilityNodeProvider}. Such 1992 * a View is a root of virtual view hierarchy and may contain the searched 1993 * text. If this flag is set Views with providers are automatically 1994 * added and it is a responsibility of the client to call the APIs of 1995 * the provider to determine whether the virtual tree rooted at this View 1996 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 1997 * represeting the virtual views with this text. 1998 * 1999 * @see #findViewsWithText(ArrayList, CharSequence, int) 2000 * 2001 * @hide 2002 */ 2003 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2004 2005 /** 2006 * Indicates that the screen has changed state and is now off. 2007 * 2008 * @see #onScreenStateChanged(int) 2009 */ 2010 public static final int SCREEN_STATE_OFF = 0x0; 2011 2012 /** 2013 * Indicates that the screen has changed state and is now on. 2014 * 2015 * @see #onScreenStateChanged(int) 2016 */ 2017 public static final int SCREEN_STATE_ON = 0x1; 2018 2019 /** 2020 * Controls the over-scroll mode for this view. 2021 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2022 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2023 * and {@link #OVER_SCROLL_NEVER}. 2024 */ 2025 private int mOverScrollMode; 2026 2027 /** 2028 * The parent this view is attached to. 2029 * {@hide} 2030 * 2031 * @see #getParent() 2032 */ 2033 protected ViewParent mParent; 2034 2035 /** 2036 * {@hide} 2037 */ 2038 AttachInfo mAttachInfo; 2039 2040 /** 2041 * {@hide} 2042 */ 2043 @ViewDebug.ExportedProperty(flagMapping = { 2044 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2045 name = "FORCE_LAYOUT"), 2046 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2047 name = "LAYOUT_REQUIRED"), 2048 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2049 name = "DRAWING_CACHE_INVALID", outputIf = false), 2050 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2051 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2052 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2053 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2054 }) 2055 int mPrivateFlags; 2056 int mPrivateFlags2; 2057 2058 /** 2059 * This view's request for the visibility of the status bar. 2060 * @hide 2061 */ 2062 @ViewDebug.ExportedProperty(flagMapping = { 2063 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2064 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2065 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2066 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2067 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2068 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2069 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2070 equals = SYSTEM_UI_FLAG_VISIBLE, 2071 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2072 }) 2073 int mSystemUiVisibility; 2074 2075 /** 2076 * Count of how many windows this view has been attached to. 2077 */ 2078 int mWindowAttachCount; 2079 2080 /** 2081 * The layout parameters associated with this view and used by the parent 2082 * {@link android.view.ViewGroup} to determine how this view should be 2083 * laid out. 2084 * {@hide} 2085 */ 2086 protected ViewGroup.LayoutParams mLayoutParams; 2087 2088 /** 2089 * The view flags hold various views states. 2090 * {@hide} 2091 */ 2092 @ViewDebug.ExportedProperty 2093 int mViewFlags; 2094 2095 static class TransformationInfo { 2096 /** 2097 * The transform matrix for the View. This transform is calculated internally 2098 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2099 * is used by default. Do *not* use this variable directly; instead call 2100 * getMatrix(), which will automatically recalculate the matrix if necessary 2101 * to get the correct matrix based on the latest rotation and scale properties. 2102 */ 2103 private final Matrix mMatrix = new Matrix(); 2104 2105 /** 2106 * The transform matrix for the View. This transform is calculated internally 2107 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2108 * is used by default. Do *not* use this variable directly; instead call 2109 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2110 * to get the correct matrix based on the latest rotation and scale properties. 2111 */ 2112 private Matrix mInverseMatrix; 2113 2114 /** 2115 * An internal variable that tracks whether we need to recalculate the 2116 * transform matrix, based on whether the rotation or scaleX/Y properties 2117 * have changed since the matrix was last calculated. 2118 */ 2119 boolean mMatrixDirty = false; 2120 2121 /** 2122 * An internal variable that tracks whether we need to recalculate the 2123 * transform matrix, based on whether the rotation or scaleX/Y properties 2124 * have changed since the matrix was last calculated. 2125 */ 2126 private boolean mInverseMatrixDirty = true; 2127 2128 /** 2129 * A variable that tracks whether we need to recalculate the 2130 * transform matrix, based on whether the rotation or scaleX/Y properties 2131 * have changed since the matrix was last calculated. This variable 2132 * is only valid after a call to updateMatrix() or to a function that 2133 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2134 */ 2135 private boolean mMatrixIsIdentity = true; 2136 2137 /** 2138 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2139 */ 2140 private Camera mCamera = null; 2141 2142 /** 2143 * This matrix is used when computing the matrix for 3D rotations. 2144 */ 2145 private Matrix matrix3D = null; 2146 2147 /** 2148 * These prev values are used to recalculate a centered pivot point when necessary. The 2149 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2150 * set), so thes values are only used then as well. 2151 */ 2152 private int mPrevWidth = -1; 2153 private int mPrevHeight = -1; 2154 2155 /** 2156 * The degrees rotation around the vertical axis through the pivot point. 2157 */ 2158 @ViewDebug.ExportedProperty 2159 float mRotationY = 0f; 2160 2161 /** 2162 * The degrees rotation around the horizontal axis through the pivot point. 2163 */ 2164 @ViewDebug.ExportedProperty 2165 float mRotationX = 0f; 2166 2167 /** 2168 * The degrees rotation around the pivot point. 2169 */ 2170 @ViewDebug.ExportedProperty 2171 float mRotation = 0f; 2172 2173 /** 2174 * The amount of translation of the object away from its left property (post-layout). 2175 */ 2176 @ViewDebug.ExportedProperty 2177 float mTranslationX = 0f; 2178 2179 /** 2180 * The amount of translation of the object away from its top property (post-layout). 2181 */ 2182 @ViewDebug.ExportedProperty 2183 float mTranslationY = 0f; 2184 2185 /** 2186 * The amount of scale in the x direction around the pivot point. A 2187 * value of 1 means no scaling is applied. 2188 */ 2189 @ViewDebug.ExportedProperty 2190 float mScaleX = 1f; 2191 2192 /** 2193 * The amount of scale in the y direction around the pivot point. A 2194 * value of 1 means no scaling is applied. 2195 */ 2196 @ViewDebug.ExportedProperty 2197 float mScaleY = 1f; 2198 2199 /** 2200 * The x location of the point around which the view is rotated and scaled. 2201 */ 2202 @ViewDebug.ExportedProperty 2203 float mPivotX = 0f; 2204 2205 /** 2206 * The y location of the point around which the view is rotated and scaled. 2207 */ 2208 @ViewDebug.ExportedProperty 2209 float mPivotY = 0f; 2210 2211 /** 2212 * The opacity of the View. This is a value from 0 to 1, where 0 means 2213 * completely transparent and 1 means completely opaque. 2214 */ 2215 @ViewDebug.ExportedProperty 2216 float mAlpha = 1f; 2217 } 2218 2219 TransformationInfo mTransformationInfo; 2220 2221 private boolean mLastIsOpaque; 2222 2223 /** 2224 * Convenience value to check for float values that are close enough to zero to be considered 2225 * zero. 2226 */ 2227 private static final float NONZERO_EPSILON = .001f; 2228 2229 /** 2230 * The distance in pixels from the left edge of this view's parent 2231 * to the left edge of this view. 2232 * {@hide} 2233 */ 2234 @ViewDebug.ExportedProperty(category = "layout") 2235 protected int mLeft; 2236 /** 2237 * The distance in pixels from the left edge of this view's parent 2238 * to the right edge of this view. 2239 * {@hide} 2240 */ 2241 @ViewDebug.ExportedProperty(category = "layout") 2242 protected int mRight; 2243 /** 2244 * The distance in pixels from the top edge of this view's parent 2245 * to the top edge of this view. 2246 * {@hide} 2247 */ 2248 @ViewDebug.ExportedProperty(category = "layout") 2249 protected int mTop; 2250 /** 2251 * The distance in pixels from the top edge of this view's parent 2252 * to the bottom edge of this view. 2253 * {@hide} 2254 */ 2255 @ViewDebug.ExportedProperty(category = "layout") 2256 protected int mBottom; 2257 2258 /** 2259 * The offset, in pixels, by which the content of this view is scrolled 2260 * horizontally. 2261 * {@hide} 2262 */ 2263 @ViewDebug.ExportedProperty(category = "scrolling") 2264 protected int mScrollX; 2265 /** 2266 * The offset, in pixels, by which the content of this view is scrolled 2267 * vertically. 2268 * {@hide} 2269 */ 2270 @ViewDebug.ExportedProperty(category = "scrolling") 2271 protected int mScrollY; 2272 2273 /** 2274 * The left padding in pixels, that is the distance in pixels between the 2275 * left edge of this view and the left edge of its content. 2276 * {@hide} 2277 */ 2278 @ViewDebug.ExportedProperty(category = "padding") 2279 protected int mPaddingLeft; 2280 /** 2281 * The right padding in pixels, that is the distance in pixels between the 2282 * right edge of this view and the right edge of its content. 2283 * {@hide} 2284 */ 2285 @ViewDebug.ExportedProperty(category = "padding") 2286 protected int mPaddingRight; 2287 /** 2288 * The top padding in pixels, that is the distance in pixels between the 2289 * top edge of this view and the top edge of its content. 2290 * {@hide} 2291 */ 2292 @ViewDebug.ExportedProperty(category = "padding") 2293 protected int mPaddingTop; 2294 /** 2295 * The bottom padding in pixels, that is the distance in pixels between the 2296 * bottom edge of this view and the bottom edge of its content. 2297 * {@hide} 2298 */ 2299 @ViewDebug.ExportedProperty(category = "padding") 2300 protected int mPaddingBottom; 2301 2302 /** 2303 * Briefly describes the view and is primarily used for accessibility support. 2304 */ 2305 private CharSequence mContentDescription; 2306 2307 /** 2308 * Cache the paddingRight set by the user to append to the scrollbar's size. 2309 * 2310 * @hide 2311 */ 2312 @ViewDebug.ExportedProperty(category = "padding") 2313 protected int mUserPaddingRight; 2314 2315 /** 2316 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2317 * 2318 * @hide 2319 */ 2320 @ViewDebug.ExportedProperty(category = "padding") 2321 protected int mUserPaddingBottom; 2322 2323 /** 2324 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2325 * 2326 * @hide 2327 */ 2328 @ViewDebug.ExportedProperty(category = "padding") 2329 protected int mUserPaddingLeft; 2330 2331 /** 2332 * Cache if the user padding is relative. 2333 * 2334 */ 2335 @ViewDebug.ExportedProperty(category = "padding") 2336 boolean mUserPaddingRelative; 2337 2338 /** 2339 * Cache the paddingStart set by the user to append to the scrollbar's size. 2340 * 2341 */ 2342 @ViewDebug.ExportedProperty(category = "padding") 2343 int mUserPaddingStart; 2344 2345 /** 2346 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2347 * 2348 */ 2349 @ViewDebug.ExportedProperty(category = "padding") 2350 int mUserPaddingEnd; 2351 2352 /** 2353 * @hide 2354 */ 2355 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2356 /** 2357 * @hide 2358 */ 2359 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2360 2361 private Drawable mBGDrawable; 2362 2363 private int mBackgroundResource; 2364 private boolean mBackgroundSizeChanged; 2365 2366 static class ListenerInfo { 2367 /** 2368 * Listener used to dispatch focus change events. 2369 * This field should be made private, so it is hidden from the SDK. 2370 * {@hide} 2371 */ 2372 protected OnFocusChangeListener mOnFocusChangeListener; 2373 2374 /** 2375 * Listeners for layout change events. 2376 */ 2377 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2378 2379 /** 2380 * Listeners for attach events. 2381 */ 2382 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2383 2384 /** 2385 * Listener used to dispatch click events. 2386 * This field should be made private, so it is hidden from the SDK. 2387 * {@hide} 2388 */ 2389 public OnClickListener mOnClickListener; 2390 2391 /** 2392 * Listener used to dispatch long click events. 2393 * This field should be made private, so it is hidden from the SDK. 2394 * {@hide} 2395 */ 2396 protected OnLongClickListener mOnLongClickListener; 2397 2398 /** 2399 * Listener used to build the context menu. 2400 * This field should be made private, so it is hidden from the SDK. 2401 * {@hide} 2402 */ 2403 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2404 2405 private OnKeyListener mOnKeyListener; 2406 2407 private OnTouchListener mOnTouchListener; 2408 2409 private OnHoverListener mOnHoverListener; 2410 2411 private OnGenericMotionListener mOnGenericMotionListener; 2412 2413 private OnDragListener mOnDragListener; 2414 2415 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2416 } 2417 2418 ListenerInfo mListenerInfo; 2419 2420 /** 2421 * The application environment this view lives in. 2422 * This field should be made private, so it is hidden from the SDK. 2423 * {@hide} 2424 */ 2425 protected Context mContext; 2426 2427 private final Resources mResources; 2428 2429 private ScrollabilityCache mScrollCache; 2430 2431 private int[] mDrawableState = null; 2432 2433 /** 2434 * Set to true when drawing cache is enabled and cannot be created. 2435 * 2436 * @hide 2437 */ 2438 public boolean mCachingFailed; 2439 2440 private Bitmap mDrawingCache; 2441 private Bitmap mUnscaledDrawingCache; 2442 private HardwareLayer mHardwareLayer; 2443 DisplayList mDisplayList; 2444 2445 /** 2446 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2447 * the user may specify which view to go to next. 2448 */ 2449 private int mNextFocusLeftId = View.NO_ID; 2450 2451 /** 2452 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2453 * the user may specify which view to go to next. 2454 */ 2455 private int mNextFocusRightId = View.NO_ID; 2456 2457 /** 2458 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2459 * the user may specify which view to go to next. 2460 */ 2461 private int mNextFocusUpId = View.NO_ID; 2462 2463 /** 2464 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2465 * the user may specify which view to go to next. 2466 */ 2467 private int mNextFocusDownId = View.NO_ID; 2468 2469 /** 2470 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2471 * the user may specify which view to go to next. 2472 */ 2473 int mNextFocusForwardId = View.NO_ID; 2474 2475 private CheckForLongPress mPendingCheckForLongPress; 2476 private CheckForTap mPendingCheckForTap = null; 2477 private PerformClick mPerformClick; 2478 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2479 2480 private UnsetPressedState mUnsetPressedState; 2481 2482 /** 2483 * Whether the long press's action has been invoked. The tap's action is invoked on the 2484 * up event while a long press is invoked as soon as the long press duration is reached, so 2485 * a long press could be performed before the tap is checked, in which case the tap's action 2486 * should not be invoked. 2487 */ 2488 private boolean mHasPerformedLongPress; 2489 2490 /** 2491 * The minimum height of the view. We'll try our best to have the height 2492 * of this view to at least this amount. 2493 */ 2494 @ViewDebug.ExportedProperty(category = "measurement") 2495 private int mMinHeight; 2496 2497 /** 2498 * The minimum width of the view. We'll try our best to have the width 2499 * of this view to at least this amount. 2500 */ 2501 @ViewDebug.ExportedProperty(category = "measurement") 2502 private int mMinWidth; 2503 2504 /** 2505 * The delegate to handle touch events that are physically in this view 2506 * but should be handled by another view. 2507 */ 2508 private TouchDelegate mTouchDelegate = null; 2509 2510 /** 2511 * Solid color to use as a background when creating the drawing cache. Enables 2512 * the cache to use 16 bit bitmaps instead of 32 bit. 2513 */ 2514 private int mDrawingCacheBackgroundColor = 0; 2515 2516 /** 2517 * Special tree observer used when mAttachInfo is null. 2518 */ 2519 private ViewTreeObserver mFloatingTreeObserver; 2520 2521 /** 2522 * Cache the touch slop from the context that created the view. 2523 */ 2524 private int mTouchSlop; 2525 2526 /** 2527 * Object that handles automatic animation of view properties. 2528 */ 2529 private ViewPropertyAnimator mAnimator = null; 2530 2531 /** 2532 * Flag indicating that a drag can cross window boundaries. When 2533 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2534 * with this flag set, all visible applications will be able to participate 2535 * in the drag operation and receive the dragged content. 2536 * 2537 * @hide 2538 */ 2539 public static final int DRAG_FLAG_GLOBAL = 1; 2540 2541 /** 2542 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2543 */ 2544 private float mVerticalScrollFactor; 2545 2546 /** 2547 * Position of the vertical scroll bar. 2548 */ 2549 private int mVerticalScrollbarPosition; 2550 2551 /** 2552 * Position the scroll bar at the default position as determined by the system. 2553 */ 2554 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2555 2556 /** 2557 * Position the scroll bar along the left edge. 2558 */ 2559 public static final int SCROLLBAR_POSITION_LEFT = 1; 2560 2561 /** 2562 * Position the scroll bar along the right edge. 2563 */ 2564 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2565 2566 /** 2567 * Indicates that the view does not have a layer. 2568 * 2569 * @see #getLayerType() 2570 * @see #setLayerType(int, android.graphics.Paint) 2571 * @see #LAYER_TYPE_SOFTWARE 2572 * @see #LAYER_TYPE_HARDWARE 2573 */ 2574 public static final int LAYER_TYPE_NONE = 0; 2575 2576 /** 2577 * <p>Indicates that the view has a software layer. A software layer is backed 2578 * by a bitmap and causes the view to be rendered using Android's software 2579 * rendering pipeline, even if hardware acceleration is enabled.</p> 2580 * 2581 * <p>Software layers have various usages:</p> 2582 * <p>When the application is not using hardware acceleration, a software layer 2583 * is useful to apply a specific color filter and/or blending mode and/or 2584 * translucency to a view and all its children.</p> 2585 * <p>When the application is using hardware acceleration, a software layer 2586 * is useful to render drawing primitives not supported by the hardware 2587 * accelerated pipeline. It can also be used to cache a complex view tree 2588 * into a texture and reduce the complexity of drawing operations. For instance, 2589 * when animating a complex view tree with a translation, a software layer can 2590 * be used to render the view tree only once.</p> 2591 * <p>Software layers should be avoided when the affected view tree updates 2592 * often. Every update will require to re-render the software layer, which can 2593 * potentially be slow (particularly when hardware acceleration is turned on 2594 * since the layer will have to be uploaded into a hardware texture after every 2595 * update.)</p> 2596 * 2597 * @see #getLayerType() 2598 * @see #setLayerType(int, android.graphics.Paint) 2599 * @see #LAYER_TYPE_NONE 2600 * @see #LAYER_TYPE_HARDWARE 2601 */ 2602 public static final int LAYER_TYPE_SOFTWARE = 1; 2603 2604 /** 2605 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2606 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2607 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2608 * rendering pipeline, but only if hardware acceleration is turned on for the 2609 * view hierarchy. When hardware acceleration is turned off, hardware layers 2610 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2611 * 2612 * <p>A hardware layer is useful to apply a specific color filter and/or 2613 * blending mode and/or translucency to a view and all its children.</p> 2614 * <p>A hardware layer can be used to cache a complex view tree into a 2615 * texture and reduce the complexity of drawing operations. For instance, 2616 * when animating a complex view tree with a translation, a hardware layer can 2617 * be used to render the view tree only once.</p> 2618 * <p>A hardware layer can also be used to increase the rendering quality when 2619 * rotation transformations are applied on a view. It can also be used to 2620 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2621 * 2622 * @see #getLayerType() 2623 * @see #setLayerType(int, android.graphics.Paint) 2624 * @see #LAYER_TYPE_NONE 2625 * @see #LAYER_TYPE_SOFTWARE 2626 */ 2627 public static final int LAYER_TYPE_HARDWARE = 2; 2628 2629 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2630 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2631 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2632 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2633 }) 2634 int mLayerType = LAYER_TYPE_NONE; 2635 Paint mLayerPaint; 2636 Rect mLocalDirtyRect; 2637 2638 /** 2639 * Set to true when the view is sending hover accessibility events because it 2640 * is the innermost hovered view. 2641 */ 2642 private boolean mSendingHoverAccessibilityEvents; 2643 2644 /** 2645 * Delegate for injecting accessiblity functionality. 2646 */ 2647 AccessibilityDelegate mAccessibilityDelegate; 2648 2649 /** 2650 * Text direction is inherited thru {@link ViewGroup} 2651 */ 2652 public static final int TEXT_DIRECTION_INHERIT = 0; 2653 2654 /** 2655 * Text direction is using "first strong algorithm". The first strong directional character 2656 * determines the paragraph direction. If there is no strong directional character, the 2657 * paragraph direction is the view's resolved layout direction. 2658 * 2659 */ 2660 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 2661 2662 /** 2663 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 2664 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 2665 * If there are neither, the paragraph direction is the view's resolved layout direction. 2666 * 2667 */ 2668 public static final int TEXT_DIRECTION_ANY_RTL = 2; 2669 2670 /** 2671 * Text direction is forced to LTR. 2672 * 2673 */ 2674 public static final int TEXT_DIRECTION_LTR = 3; 2675 2676 /** 2677 * Text direction is forced to RTL. 2678 * 2679 */ 2680 public static final int TEXT_DIRECTION_RTL = 4; 2681 2682 /** 2683 * Text direction is coming from the system Locale. 2684 * 2685 */ 2686 public static final int TEXT_DIRECTION_LOCALE = 5; 2687 2688 /** 2689 * Default text direction is inherited 2690 * 2691 */ 2692 protected static int DEFAULT_TEXT_DIRECTION = TEXT_DIRECTION_INHERIT; 2693 2694 /** 2695 * The text direction that has been defined by {@link #setTextDirection(int)}. 2696 * 2697 */ 2698 @ViewDebug.ExportedProperty(category = "text", mapping = { 2699 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2700 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2701 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2702 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2703 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 2704 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 2705 }) 2706 private int mTextDirection = DEFAULT_TEXT_DIRECTION; 2707 2708 /** 2709 * The resolved text direction. This needs resolution if the value is 2710 * TEXT_DIRECTION_INHERIT. The resolution matches mTextDirection if it is 2711 * not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds up the parent 2712 * chain of the view. 2713 * 2714 */ 2715 @ViewDebug.ExportedProperty(category = "text", mapping = { 2716 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2717 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2718 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2719 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2720 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 2721 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 2722 }) 2723 private int mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 2724 2725 /** 2726 * Consistency verifier for debugging purposes. 2727 * @hide 2728 */ 2729 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 2730 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 2731 new InputEventConsistencyVerifier(this, 0) : null; 2732 2733 /** 2734 * Simple constructor to use when creating a view from code. 2735 * 2736 * @param context The Context the view is running in, through which it can 2737 * access the current theme, resources, etc. 2738 */ 2739 public View(Context context) { 2740 mContext = context; 2741 mResources = context != null ? context.getResources() : null; 2742 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED | LAYOUT_DIRECTION_INHERIT; 2743 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2744 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2745 mUserPaddingStart = -1; 2746 mUserPaddingEnd = -1; 2747 mUserPaddingRelative = false; 2748 } 2749 2750 /** 2751 * Constructor that is called when inflating a view from XML. This is called 2752 * when a view is being constructed from an XML file, supplying attributes 2753 * that were specified in the XML file. This version uses a default style of 2754 * 0, so the only attribute values applied are those in the Context's Theme 2755 * and the given AttributeSet. 2756 * 2757 * <p> 2758 * The method onFinishInflate() will be called after all children have been 2759 * added. 2760 * 2761 * @param context The Context the view is running in, through which it can 2762 * access the current theme, resources, etc. 2763 * @param attrs The attributes of the XML tag that is inflating the view. 2764 * @see #View(Context, AttributeSet, int) 2765 */ 2766 public View(Context context, AttributeSet attrs) { 2767 this(context, attrs, 0); 2768 } 2769 2770 /** 2771 * Perform inflation from XML and apply a class-specific base style. This 2772 * constructor of View allows subclasses to use their own base style when 2773 * they are inflating. For example, a Button class's constructor would call 2774 * this version of the super class constructor and supply 2775 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2776 * the theme's button style to modify all of the base view attributes (in 2777 * particular its background) as well as the Button class's attributes. 2778 * 2779 * @param context The Context the view is running in, through which it can 2780 * access the current theme, resources, etc. 2781 * @param attrs The attributes of the XML tag that is inflating the view. 2782 * @param defStyle The default style to apply to this view. If 0, no style 2783 * will be applied (beyond what is included in the theme). This may 2784 * either be an attribute resource, whose value will be retrieved 2785 * from the current theme, or an explicit style resource. 2786 * @see #View(Context, AttributeSet) 2787 */ 2788 public View(Context context, AttributeSet attrs, int defStyle) { 2789 this(context); 2790 2791 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2792 defStyle, 0); 2793 2794 Drawable background = null; 2795 2796 int leftPadding = -1; 2797 int topPadding = -1; 2798 int rightPadding = -1; 2799 int bottomPadding = -1; 2800 int startPadding = -1; 2801 int endPadding = -1; 2802 2803 int padding = -1; 2804 2805 int viewFlagValues = 0; 2806 int viewFlagMasks = 0; 2807 2808 boolean setScrollContainer = false; 2809 2810 int x = 0; 2811 int y = 0; 2812 2813 float tx = 0; 2814 float ty = 0; 2815 float rotation = 0; 2816 float rotationX = 0; 2817 float rotationY = 0; 2818 float sx = 1f; 2819 float sy = 1f; 2820 boolean transformSet = false; 2821 2822 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2823 2824 int overScrollMode = mOverScrollMode; 2825 final int N = a.getIndexCount(); 2826 for (int i = 0; i < N; i++) { 2827 int attr = a.getIndex(i); 2828 switch (attr) { 2829 case com.android.internal.R.styleable.View_background: 2830 background = a.getDrawable(attr); 2831 break; 2832 case com.android.internal.R.styleable.View_padding: 2833 padding = a.getDimensionPixelSize(attr, -1); 2834 break; 2835 case com.android.internal.R.styleable.View_paddingLeft: 2836 leftPadding = a.getDimensionPixelSize(attr, -1); 2837 break; 2838 case com.android.internal.R.styleable.View_paddingTop: 2839 topPadding = a.getDimensionPixelSize(attr, -1); 2840 break; 2841 case com.android.internal.R.styleable.View_paddingRight: 2842 rightPadding = a.getDimensionPixelSize(attr, -1); 2843 break; 2844 case com.android.internal.R.styleable.View_paddingBottom: 2845 bottomPadding = a.getDimensionPixelSize(attr, -1); 2846 break; 2847 case com.android.internal.R.styleable.View_paddingStart: 2848 startPadding = a.getDimensionPixelSize(attr, -1); 2849 break; 2850 case com.android.internal.R.styleable.View_paddingEnd: 2851 endPadding = a.getDimensionPixelSize(attr, -1); 2852 break; 2853 case com.android.internal.R.styleable.View_scrollX: 2854 x = a.getDimensionPixelOffset(attr, 0); 2855 break; 2856 case com.android.internal.R.styleable.View_scrollY: 2857 y = a.getDimensionPixelOffset(attr, 0); 2858 break; 2859 case com.android.internal.R.styleable.View_alpha: 2860 setAlpha(a.getFloat(attr, 1f)); 2861 break; 2862 case com.android.internal.R.styleable.View_transformPivotX: 2863 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2864 break; 2865 case com.android.internal.R.styleable.View_transformPivotY: 2866 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2867 break; 2868 case com.android.internal.R.styleable.View_translationX: 2869 tx = a.getDimensionPixelOffset(attr, 0); 2870 transformSet = true; 2871 break; 2872 case com.android.internal.R.styleable.View_translationY: 2873 ty = a.getDimensionPixelOffset(attr, 0); 2874 transformSet = true; 2875 break; 2876 case com.android.internal.R.styleable.View_rotation: 2877 rotation = a.getFloat(attr, 0); 2878 transformSet = true; 2879 break; 2880 case com.android.internal.R.styleable.View_rotationX: 2881 rotationX = a.getFloat(attr, 0); 2882 transformSet = true; 2883 break; 2884 case com.android.internal.R.styleable.View_rotationY: 2885 rotationY = a.getFloat(attr, 0); 2886 transformSet = true; 2887 break; 2888 case com.android.internal.R.styleable.View_scaleX: 2889 sx = a.getFloat(attr, 1f); 2890 transformSet = true; 2891 break; 2892 case com.android.internal.R.styleable.View_scaleY: 2893 sy = a.getFloat(attr, 1f); 2894 transformSet = true; 2895 break; 2896 case com.android.internal.R.styleable.View_id: 2897 mID = a.getResourceId(attr, NO_ID); 2898 break; 2899 case com.android.internal.R.styleable.View_tag: 2900 mTag = a.getText(attr); 2901 break; 2902 case com.android.internal.R.styleable.View_fitsSystemWindows: 2903 if (a.getBoolean(attr, false)) { 2904 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2905 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2906 } 2907 break; 2908 case com.android.internal.R.styleable.View_focusable: 2909 if (a.getBoolean(attr, false)) { 2910 viewFlagValues |= FOCUSABLE; 2911 viewFlagMasks |= FOCUSABLE_MASK; 2912 } 2913 break; 2914 case com.android.internal.R.styleable.View_focusableInTouchMode: 2915 if (a.getBoolean(attr, false)) { 2916 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2917 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2918 } 2919 break; 2920 case com.android.internal.R.styleable.View_clickable: 2921 if (a.getBoolean(attr, false)) { 2922 viewFlagValues |= CLICKABLE; 2923 viewFlagMasks |= CLICKABLE; 2924 } 2925 break; 2926 case com.android.internal.R.styleable.View_longClickable: 2927 if (a.getBoolean(attr, false)) { 2928 viewFlagValues |= LONG_CLICKABLE; 2929 viewFlagMasks |= LONG_CLICKABLE; 2930 } 2931 break; 2932 case com.android.internal.R.styleable.View_saveEnabled: 2933 if (!a.getBoolean(attr, true)) { 2934 viewFlagValues |= SAVE_DISABLED; 2935 viewFlagMasks |= SAVE_DISABLED_MASK; 2936 } 2937 break; 2938 case com.android.internal.R.styleable.View_duplicateParentState: 2939 if (a.getBoolean(attr, false)) { 2940 viewFlagValues |= DUPLICATE_PARENT_STATE; 2941 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2942 } 2943 break; 2944 case com.android.internal.R.styleable.View_visibility: 2945 final int visibility = a.getInt(attr, 0); 2946 if (visibility != 0) { 2947 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2948 viewFlagMasks |= VISIBILITY_MASK; 2949 } 2950 break; 2951 case com.android.internal.R.styleable.View_layoutDirection: 2952 // Clear any HORIZONTAL_DIRECTION flag already set 2953 viewFlagValues &= ~LAYOUT_DIRECTION_MASK; 2954 // Set the HORIZONTAL_DIRECTION flags depending on the value of the attribute 2955 final int layoutDirection = a.getInt(attr, -1); 2956 if (layoutDirection != -1) { 2957 viewFlagValues |= LAYOUT_DIRECTION_FLAGS[layoutDirection]; 2958 } else { 2959 // Set to default (LAYOUT_DIRECTION_INHERIT) 2960 viewFlagValues |= LAYOUT_DIRECTION_DEFAULT; 2961 } 2962 viewFlagMasks |= LAYOUT_DIRECTION_MASK; 2963 break; 2964 case com.android.internal.R.styleable.View_drawingCacheQuality: 2965 final int cacheQuality = a.getInt(attr, 0); 2966 if (cacheQuality != 0) { 2967 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2968 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2969 } 2970 break; 2971 case com.android.internal.R.styleable.View_contentDescription: 2972 mContentDescription = a.getString(attr); 2973 break; 2974 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2975 if (!a.getBoolean(attr, true)) { 2976 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2977 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2978 } 2979 break; 2980 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2981 if (!a.getBoolean(attr, true)) { 2982 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2983 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2984 } 2985 break; 2986 case R.styleable.View_scrollbars: 2987 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2988 if (scrollbars != SCROLLBARS_NONE) { 2989 viewFlagValues |= scrollbars; 2990 viewFlagMasks |= SCROLLBARS_MASK; 2991 initializeScrollbars(a); 2992 } 2993 break; 2994 //noinspection deprecation 2995 case R.styleable.View_fadingEdge: 2996 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 2997 // Ignore the attribute starting with ICS 2998 break; 2999 } 3000 // With builds < ICS, fall through and apply fading edges 3001 case R.styleable.View_requiresFadingEdge: 3002 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3003 if (fadingEdge != FADING_EDGE_NONE) { 3004 viewFlagValues |= fadingEdge; 3005 viewFlagMasks |= FADING_EDGE_MASK; 3006 initializeFadingEdge(a); 3007 } 3008 break; 3009 case R.styleable.View_scrollbarStyle: 3010 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3011 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3012 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3013 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3014 } 3015 break; 3016 case R.styleable.View_isScrollContainer: 3017 setScrollContainer = true; 3018 if (a.getBoolean(attr, false)) { 3019 setScrollContainer(true); 3020 } 3021 break; 3022 case com.android.internal.R.styleable.View_keepScreenOn: 3023 if (a.getBoolean(attr, false)) { 3024 viewFlagValues |= KEEP_SCREEN_ON; 3025 viewFlagMasks |= KEEP_SCREEN_ON; 3026 } 3027 break; 3028 case R.styleable.View_filterTouchesWhenObscured: 3029 if (a.getBoolean(attr, false)) { 3030 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3031 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3032 } 3033 break; 3034 case R.styleable.View_nextFocusLeft: 3035 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3036 break; 3037 case R.styleable.View_nextFocusRight: 3038 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3039 break; 3040 case R.styleable.View_nextFocusUp: 3041 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3042 break; 3043 case R.styleable.View_nextFocusDown: 3044 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3045 break; 3046 case R.styleable.View_nextFocusForward: 3047 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3048 break; 3049 case R.styleable.View_minWidth: 3050 mMinWidth = a.getDimensionPixelSize(attr, 0); 3051 break; 3052 case R.styleable.View_minHeight: 3053 mMinHeight = a.getDimensionPixelSize(attr, 0); 3054 break; 3055 case R.styleable.View_onClick: 3056 if (context.isRestricted()) { 3057 throw new IllegalStateException("The android:onClick attribute cannot " 3058 + "be used within a restricted context"); 3059 } 3060 3061 final String handlerName = a.getString(attr); 3062 if (handlerName != null) { 3063 setOnClickListener(new OnClickListener() { 3064 private Method mHandler; 3065 3066 public void onClick(View v) { 3067 if (mHandler == null) { 3068 try { 3069 mHandler = getContext().getClass().getMethod(handlerName, 3070 View.class); 3071 } catch (NoSuchMethodException e) { 3072 int id = getId(); 3073 String idText = id == NO_ID ? "" : " with id '" 3074 + getContext().getResources().getResourceEntryName( 3075 id) + "'"; 3076 throw new IllegalStateException("Could not find a method " + 3077 handlerName + "(View) in the activity " 3078 + getContext().getClass() + " for onClick handler" 3079 + " on view " + View.this.getClass() + idText, e); 3080 } 3081 } 3082 3083 try { 3084 mHandler.invoke(getContext(), View.this); 3085 } catch (IllegalAccessException e) { 3086 throw new IllegalStateException("Could not execute non " 3087 + "public method of the activity", e); 3088 } catch (InvocationTargetException e) { 3089 throw new IllegalStateException("Could not execute " 3090 + "method of the activity", e); 3091 } 3092 } 3093 }); 3094 } 3095 break; 3096 case R.styleable.View_overScrollMode: 3097 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3098 break; 3099 case R.styleable.View_verticalScrollbarPosition: 3100 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3101 break; 3102 case R.styleable.View_layerType: 3103 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3104 break; 3105 case R.styleable.View_textDirection: 3106 mTextDirection = a.getInt(attr, DEFAULT_TEXT_DIRECTION); 3107 break; 3108 } 3109 } 3110 3111 a.recycle(); 3112 3113 setOverScrollMode(overScrollMode); 3114 3115 if (background != null) { 3116 setBackgroundDrawable(background); 3117 } 3118 3119 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3120 // layout direction). Those cached values will be used later during padding resolution. 3121 mUserPaddingStart = startPadding; 3122 mUserPaddingEnd = endPadding; 3123 3124 updateUserPaddingRelative(); 3125 3126 if (padding >= 0) { 3127 leftPadding = padding; 3128 topPadding = padding; 3129 rightPadding = padding; 3130 bottomPadding = padding; 3131 } 3132 3133 // If the user specified the padding (either with android:padding or 3134 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3135 // use the default padding or the padding from the background drawable 3136 // (stored at this point in mPadding*) 3137 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3138 topPadding >= 0 ? topPadding : mPaddingTop, 3139 rightPadding >= 0 ? rightPadding : mPaddingRight, 3140 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3141 3142 if (viewFlagMasks != 0) { 3143 setFlags(viewFlagValues, viewFlagMasks); 3144 } 3145 3146 // Needs to be called after mViewFlags is set 3147 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3148 recomputePadding(); 3149 } 3150 3151 if (x != 0 || y != 0) { 3152 scrollTo(x, y); 3153 } 3154 3155 if (transformSet) { 3156 setTranslationX(tx); 3157 setTranslationY(ty); 3158 setRotation(rotation); 3159 setRotationX(rotationX); 3160 setRotationY(rotationY); 3161 setScaleX(sx); 3162 setScaleY(sy); 3163 } 3164 3165 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3166 setScrollContainer(true); 3167 } 3168 3169 computeOpaqueFlags(); 3170 } 3171 3172 private void updateUserPaddingRelative() { 3173 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3174 } 3175 3176 /** 3177 * Non-public constructor for use in testing 3178 */ 3179 View() { 3180 mResources = null; 3181 } 3182 3183 /** 3184 * <p> 3185 * Initializes the fading edges from a given set of styled attributes. This 3186 * method should be called by subclasses that need fading edges and when an 3187 * instance of these subclasses is created programmatically rather than 3188 * being inflated from XML. This method is automatically called when the XML 3189 * is inflated. 3190 * </p> 3191 * 3192 * @param a the styled attributes set to initialize the fading edges from 3193 */ 3194 protected void initializeFadingEdge(TypedArray a) { 3195 initScrollCache(); 3196 3197 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3198 R.styleable.View_fadingEdgeLength, 3199 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3200 } 3201 3202 /** 3203 * Returns the size of the vertical faded edges used to indicate that more 3204 * content in this view is visible. 3205 * 3206 * @return The size in pixels of the vertical faded edge or 0 if vertical 3207 * faded edges are not enabled for this view. 3208 * @attr ref android.R.styleable#View_fadingEdgeLength 3209 */ 3210 public int getVerticalFadingEdgeLength() { 3211 if (isVerticalFadingEdgeEnabled()) { 3212 ScrollabilityCache cache = mScrollCache; 3213 if (cache != null) { 3214 return cache.fadingEdgeLength; 3215 } 3216 } 3217 return 0; 3218 } 3219 3220 /** 3221 * Set the size of the faded edge used to indicate that more content in this 3222 * view is available. Will not change whether the fading edge is enabled; use 3223 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3224 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3225 * for the vertical or horizontal fading edges. 3226 * 3227 * @param length The size in pixels of the faded edge used to indicate that more 3228 * content in this view is visible. 3229 */ 3230 public void setFadingEdgeLength(int length) { 3231 initScrollCache(); 3232 mScrollCache.fadingEdgeLength = length; 3233 } 3234 3235 /** 3236 * Returns the size of the horizontal faded edges used to indicate that more 3237 * content in this view is visible. 3238 * 3239 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3240 * faded edges are not enabled for this view. 3241 * @attr ref android.R.styleable#View_fadingEdgeLength 3242 */ 3243 public int getHorizontalFadingEdgeLength() { 3244 if (isHorizontalFadingEdgeEnabled()) { 3245 ScrollabilityCache cache = mScrollCache; 3246 if (cache != null) { 3247 return cache.fadingEdgeLength; 3248 } 3249 } 3250 return 0; 3251 } 3252 3253 /** 3254 * Returns the width of the vertical scrollbar. 3255 * 3256 * @return The width in pixels of the vertical scrollbar or 0 if there 3257 * is no vertical scrollbar. 3258 */ 3259 public int getVerticalScrollbarWidth() { 3260 ScrollabilityCache cache = mScrollCache; 3261 if (cache != null) { 3262 ScrollBarDrawable scrollBar = cache.scrollBar; 3263 if (scrollBar != null) { 3264 int size = scrollBar.getSize(true); 3265 if (size <= 0) { 3266 size = cache.scrollBarSize; 3267 } 3268 return size; 3269 } 3270 return 0; 3271 } 3272 return 0; 3273 } 3274 3275 /** 3276 * Returns the height of the horizontal scrollbar. 3277 * 3278 * @return The height in pixels of the horizontal scrollbar or 0 if 3279 * there is no horizontal scrollbar. 3280 */ 3281 protected int getHorizontalScrollbarHeight() { 3282 ScrollabilityCache cache = mScrollCache; 3283 if (cache != null) { 3284 ScrollBarDrawable scrollBar = cache.scrollBar; 3285 if (scrollBar != null) { 3286 int size = scrollBar.getSize(false); 3287 if (size <= 0) { 3288 size = cache.scrollBarSize; 3289 } 3290 return size; 3291 } 3292 return 0; 3293 } 3294 return 0; 3295 } 3296 3297 /** 3298 * <p> 3299 * Initializes the scrollbars from a given set of styled attributes. This 3300 * method should be called by subclasses that need scrollbars and when an 3301 * instance of these subclasses is created programmatically rather than 3302 * being inflated from XML. This method is automatically called when the XML 3303 * is inflated. 3304 * </p> 3305 * 3306 * @param a the styled attributes set to initialize the scrollbars from 3307 */ 3308 protected void initializeScrollbars(TypedArray a) { 3309 initScrollCache(); 3310 3311 final ScrollabilityCache scrollabilityCache = mScrollCache; 3312 3313 if (scrollabilityCache.scrollBar == null) { 3314 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3315 } 3316 3317 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3318 3319 if (!fadeScrollbars) { 3320 scrollabilityCache.state = ScrollabilityCache.ON; 3321 } 3322 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3323 3324 3325 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3326 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3327 .getScrollBarFadeDuration()); 3328 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3329 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3330 ViewConfiguration.getScrollDefaultDelay()); 3331 3332 3333 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3334 com.android.internal.R.styleable.View_scrollbarSize, 3335 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3336 3337 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3338 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3339 3340 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3341 if (thumb != null) { 3342 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3343 } 3344 3345 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3346 false); 3347 if (alwaysDraw) { 3348 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3349 } 3350 3351 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3352 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3353 3354 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3355 if (thumb != null) { 3356 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3357 } 3358 3359 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3360 false); 3361 if (alwaysDraw) { 3362 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3363 } 3364 3365 // Re-apply user/background padding so that scrollbar(s) get added 3366 resolvePadding(); 3367 } 3368 3369 /** 3370 * <p> 3371 * Initalizes the scrollability cache if necessary. 3372 * </p> 3373 */ 3374 private void initScrollCache() { 3375 if (mScrollCache == null) { 3376 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3377 } 3378 } 3379 3380 /** 3381 * Set the position of the vertical scroll bar. Should be one of 3382 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3383 * {@link #SCROLLBAR_POSITION_RIGHT}. 3384 * 3385 * @param position Where the vertical scroll bar should be positioned. 3386 */ 3387 public void setVerticalScrollbarPosition(int position) { 3388 if (mVerticalScrollbarPosition != position) { 3389 mVerticalScrollbarPosition = position; 3390 computeOpaqueFlags(); 3391 resolvePadding(); 3392 } 3393 } 3394 3395 /** 3396 * @return The position where the vertical scroll bar will show, if applicable. 3397 * @see #setVerticalScrollbarPosition(int) 3398 */ 3399 public int getVerticalScrollbarPosition() { 3400 return mVerticalScrollbarPosition; 3401 } 3402 3403 ListenerInfo getListenerInfo() { 3404 if (mListenerInfo != null) { 3405 return mListenerInfo; 3406 } 3407 mListenerInfo = new ListenerInfo(); 3408 return mListenerInfo; 3409 } 3410 3411 /** 3412 * Register a callback to be invoked when focus of this view changed. 3413 * 3414 * @param l The callback that will run. 3415 */ 3416 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3417 getListenerInfo().mOnFocusChangeListener = l; 3418 } 3419 3420 /** 3421 * Add a listener that will be called when the bounds of the view change due to 3422 * layout processing. 3423 * 3424 * @param listener The listener that will be called when layout bounds change. 3425 */ 3426 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3427 ListenerInfo li = getListenerInfo(); 3428 if (li.mOnLayoutChangeListeners == null) { 3429 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3430 } 3431 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3432 li.mOnLayoutChangeListeners.add(listener); 3433 } 3434 } 3435 3436 /** 3437 * Remove a listener for layout changes. 3438 * 3439 * @param listener The listener for layout bounds change. 3440 */ 3441 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3442 ListenerInfo li = mListenerInfo; 3443 if (li == null || li.mOnLayoutChangeListeners == null) { 3444 return; 3445 } 3446 li.mOnLayoutChangeListeners.remove(listener); 3447 } 3448 3449 /** 3450 * Add a listener for attach state changes. 3451 * 3452 * This listener will be called whenever this view is attached or detached 3453 * from a window. Remove the listener using 3454 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3455 * 3456 * @param listener Listener to attach 3457 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3458 */ 3459 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3460 ListenerInfo li = getListenerInfo(); 3461 if (li.mOnAttachStateChangeListeners == null) { 3462 li.mOnAttachStateChangeListeners 3463 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3464 } 3465 li.mOnAttachStateChangeListeners.add(listener); 3466 } 3467 3468 /** 3469 * Remove a listener for attach state changes. The listener will receive no further 3470 * notification of window attach/detach events. 3471 * 3472 * @param listener Listener to remove 3473 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3474 */ 3475 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3476 ListenerInfo li = mListenerInfo; 3477 if (li == null || li.mOnAttachStateChangeListeners == null) { 3478 return; 3479 } 3480 li.mOnAttachStateChangeListeners.remove(listener); 3481 } 3482 3483 /** 3484 * Returns the focus-change callback registered for this view. 3485 * 3486 * @return The callback, or null if one is not registered. 3487 */ 3488 public OnFocusChangeListener getOnFocusChangeListener() { 3489 ListenerInfo li = mListenerInfo; 3490 return li != null ? li.mOnFocusChangeListener : null; 3491 } 3492 3493 /** 3494 * Register a callback to be invoked when this view is clicked. If this view is not 3495 * clickable, it becomes clickable. 3496 * 3497 * @param l The callback that will run 3498 * 3499 * @see #setClickable(boolean) 3500 */ 3501 public void setOnClickListener(OnClickListener l) { 3502 if (!isClickable()) { 3503 setClickable(true); 3504 } 3505 getListenerInfo().mOnClickListener = l; 3506 } 3507 3508 /** 3509 * Return whether this view has an attached OnClickListener. Returns 3510 * true if there is a listener, false if there is none. 3511 */ 3512 public boolean hasOnClickListeners() { 3513 ListenerInfo li = mListenerInfo; 3514 return (li != null && li.mOnClickListener != null); 3515 } 3516 3517 /** 3518 * Register a callback to be invoked when this view is clicked and held. If this view is not 3519 * long clickable, it becomes long clickable. 3520 * 3521 * @param l The callback that will run 3522 * 3523 * @see #setLongClickable(boolean) 3524 */ 3525 public void setOnLongClickListener(OnLongClickListener l) { 3526 if (!isLongClickable()) { 3527 setLongClickable(true); 3528 } 3529 getListenerInfo().mOnLongClickListener = l; 3530 } 3531 3532 /** 3533 * Register a callback to be invoked when the context menu for this view is 3534 * being built. If this view is not long clickable, it becomes long clickable. 3535 * 3536 * @param l The callback that will run 3537 * 3538 */ 3539 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3540 if (!isLongClickable()) { 3541 setLongClickable(true); 3542 } 3543 getListenerInfo().mOnCreateContextMenuListener = l; 3544 } 3545 3546 /** 3547 * Call this view's OnClickListener, if it is defined. Performs all normal 3548 * actions associated with clicking: reporting accessibility event, playing 3549 * a sound, etc. 3550 * 3551 * @return True there was an assigned OnClickListener that was called, false 3552 * otherwise is returned. 3553 */ 3554 public boolean performClick() { 3555 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3556 3557 ListenerInfo li = mListenerInfo; 3558 if (li != null && li.mOnClickListener != null) { 3559 playSoundEffect(SoundEffectConstants.CLICK); 3560 li.mOnClickListener.onClick(this); 3561 return true; 3562 } 3563 3564 return false; 3565 } 3566 3567 /** 3568 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3569 * this only calls the listener, and does not do any associated clicking 3570 * actions like reporting an accessibility event. 3571 * 3572 * @return True there was an assigned OnClickListener that was called, false 3573 * otherwise is returned. 3574 */ 3575 public boolean callOnClick() { 3576 ListenerInfo li = mListenerInfo; 3577 if (li != null && li.mOnClickListener != null) { 3578 li.mOnClickListener.onClick(this); 3579 return true; 3580 } 3581 return false; 3582 } 3583 3584 /** 3585 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3586 * OnLongClickListener did not consume the event. 3587 * 3588 * @return True if one of the above receivers consumed the event, false otherwise. 3589 */ 3590 public boolean performLongClick() { 3591 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3592 3593 boolean handled = false; 3594 ListenerInfo li = mListenerInfo; 3595 if (li != null && li.mOnLongClickListener != null) { 3596 handled = li.mOnLongClickListener.onLongClick(View.this); 3597 } 3598 if (!handled) { 3599 handled = showContextMenu(); 3600 } 3601 if (handled) { 3602 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3603 } 3604 return handled; 3605 } 3606 3607 /** 3608 * Performs button-related actions during a touch down event. 3609 * 3610 * @param event The event. 3611 * @return True if the down was consumed. 3612 * 3613 * @hide 3614 */ 3615 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3616 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3617 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3618 return true; 3619 } 3620 } 3621 return false; 3622 } 3623 3624 /** 3625 * Bring up the context menu for this view. 3626 * 3627 * @return Whether a context menu was displayed. 3628 */ 3629 public boolean showContextMenu() { 3630 return getParent().showContextMenuForChild(this); 3631 } 3632 3633 /** 3634 * Bring up the context menu for this view, referring to the item under the specified point. 3635 * 3636 * @param x The referenced x coordinate. 3637 * @param y The referenced y coordinate. 3638 * @param metaState The keyboard modifiers that were pressed. 3639 * @return Whether a context menu was displayed. 3640 * 3641 * @hide 3642 */ 3643 public boolean showContextMenu(float x, float y, int metaState) { 3644 return showContextMenu(); 3645 } 3646 3647 /** 3648 * Start an action mode. 3649 * 3650 * @param callback Callback that will control the lifecycle of the action mode 3651 * @return The new action mode if it is started, null otherwise 3652 * 3653 * @see ActionMode 3654 */ 3655 public ActionMode startActionMode(ActionMode.Callback callback) { 3656 ViewParent parent = getParent(); 3657 if (parent == null) return null; 3658 return parent.startActionModeForChild(this, callback); 3659 } 3660 3661 /** 3662 * Register a callback to be invoked when a key is pressed in this view. 3663 * @param l the key listener to attach to this view 3664 */ 3665 public void setOnKeyListener(OnKeyListener l) { 3666 getListenerInfo().mOnKeyListener = l; 3667 } 3668 3669 /** 3670 * Register a callback to be invoked when a touch event is sent to this view. 3671 * @param l the touch listener to attach to this view 3672 */ 3673 public void setOnTouchListener(OnTouchListener l) { 3674 getListenerInfo().mOnTouchListener = l; 3675 } 3676 3677 /** 3678 * Register a callback to be invoked when a generic motion event is sent to this view. 3679 * @param l the generic motion listener to attach to this view 3680 */ 3681 public void setOnGenericMotionListener(OnGenericMotionListener l) { 3682 getListenerInfo().mOnGenericMotionListener = l; 3683 } 3684 3685 /** 3686 * Register a callback to be invoked when a hover event is sent to this view. 3687 * @param l the hover listener to attach to this view 3688 */ 3689 public void setOnHoverListener(OnHoverListener l) { 3690 getListenerInfo().mOnHoverListener = l; 3691 } 3692 3693 /** 3694 * Register a drag event listener callback object for this View. The parameter is 3695 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 3696 * View, the system calls the 3697 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 3698 * @param l An implementation of {@link android.view.View.OnDragListener}. 3699 */ 3700 public void setOnDragListener(OnDragListener l) { 3701 getListenerInfo().mOnDragListener = l; 3702 } 3703 3704 /** 3705 * Give this view focus. This will cause 3706 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3707 * 3708 * Note: this does not check whether this {@link View} should get focus, it just 3709 * gives it focus no matter what. It should only be called internally by framework 3710 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3711 * 3712 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 3713 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 3714 * focus moved when requestFocus() is called. It may not always 3715 * apply, in which case use the default View.FOCUS_DOWN. 3716 * @param previouslyFocusedRect The rectangle of the view that had focus 3717 * prior in this View's coordinate system. 3718 */ 3719 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3720 if (DBG) { 3721 System.out.println(this + " requestFocus()"); 3722 } 3723 3724 if ((mPrivateFlags & FOCUSED) == 0) { 3725 mPrivateFlags |= FOCUSED; 3726 3727 if (mParent != null) { 3728 mParent.requestChildFocus(this, this); 3729 } 3730 3731 onFocusChanged(true, direction, previouslyFocusedRect); 3732 refreshDrawableState(); 3733 } 3734 } 3735 3736 /** 3737 * Request that a rectangle of this view be visible on the screen, 3738 * scrolling if necessary just enough. 3739 * 3740 * <p>A View should call this if it maintains some notion of which part 3741 * of its content is interesting. For example, a text editing view 3742 * should call this when its cursor moves. 3743 * 3744 * @param rectangle The rectangle. 3745 * @return Whether any parent scrolled. 3746 */ 3747 public boolean requestRectangleOnScreen(Rect rectangle) { 3748 return requestRectangleOnScreen(rectangle, false); 3749 } 3750 3751 /** 3752 * Request that a rectangle of this view be visible on the screen, 3753 * scrolling if necessary just enough. 3754 * 3755 * <p>A View should call this if it maintains some notion of which part 3756 * of its content is interesting. For example, a text editing view 3757 * should call this when its cursor moves. 3758 * 3759 * <p>When <code>immediate</code> is set to true, scrolling will not be 3760 * animated. 3761 * 3762 * @param rectangle The rectangle. 3763 * @param immediate True to forbid animated scrolling, false otherwise 3764 * @return Whether any parent scrolled. 3765 */ 3766 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3767 View child = this; 3768 ViewParent parent = mParent; 3769 boolean scrolled = false; 3770 while (parent != null) { 3771 scrolled |= parent.requestChildRectangleOnScreen(child, 3772 rectangle, immediate); 3773 3774 // offset rect so next call has the rectangle in the 3775 // coordinate system of its direct child. 3776 rectangle.offset(child.getLeft(), child.getTop()); 3777 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3778 3779 if (!(parent instanceof View)) { 3780 break; 3781 } 3782 3783 child = (View) parent; 3784 parent = child.getParent(); 3785 } 3786 return scrolled; 3787 } 3788 3789 /** 3790 * Called when this view wants to give up focus. If focus is cleared 3791 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 3792 * <p> 3793 * <strong>Note:</strong> When a View clears focus the framework is trying 3794 * to give focus to the first focusable View from the top. Hence, if this 3795 * View is the first from the top that can take focus, then its focus will 3796 * not be cleared nor will the focus change callback be invoked. 3797 * </p> 3798 */ 3799 public void clearFocus() { 3800 if (DBG) { 3801 System.out.println(this + " clearFocus()"); 3802 } 3803 3804 if ((mPrivateFlags & FOCUSED) != 0) { 3805 mPrivateFlags &= ~FOCUSED; 3806 3807 if (mParent != null) { 3808 mParent.clearChildFocus(this); 3809 } 3810 3811 onFocusChanged(false, 0, null); 3812 refreshDrawableState(); 3813 } 3814 } 3815 3816 /** 3817 * Called to clear the focus of a view that is about to be removed. 3818 * Doesn't call clearChildFocus, which prevents this view from taking 3819 * focus again before it has been removed from the parent 3820 */ 3821 void clearFocusForRemoval() { 3822 if ((mPrivateFlags & FOCUSED) != 0) { 3823 mPrivateFlags &= ~FOCUSED; 3824 3825 onFocusChanged(false, 0, null); 3826 refreshDrawableState(); 3827 3828 // The view cleared focus and invoked the callbacks, so now is the 3829 // time to give focus to the the first focusable from the top to 3830 // ensure that the gain focus is announced after clear focus. 3831 getRootView().requestFocus(FOCUS_FORWARD); 3832 } 3833 } 3834 3835 /** 3836 * Called internally by the view system when a new view is getting focus. 3837 * This is what clears the old focus. 3838 */ 3839 void unFocus() { 3840 if (DBG) { 3841 System.out.println(this + " unFocus()"); 3842 } 3843 3844 if ((mPrivateFlags & FOCUSED) != 0) { 3845 mPrivateFlags &= ~FOCUSED; 3846 3847 onFocusChanged(false, 0, null); 3848 refreshDrawableState(); 3849 } 3850 } 3851 3852 /** 3853 * Returns true if this view has focus iteself, or is the ancestor of the 3854 * view that has focus. 3855 * 3856 * @return True if this view has or contains focus, false otherwise. 3857 */ 3858 @ViewDebug.ExportedProperty(category = "focus") 3859 public boolean hasFocus() { 3860 return (mPrivateFlags & FOCUSED) != 0; 3861 } 3862 3863 /** 3864 * Returns true if this view is focusable or if it contains a reachable View 3865 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3866 * is a View whose parents do not block descendants focus. 3867 * 3868 * Only {@link #VISIBLE} views are considered focusable. 3869 * 3870 * @return True if the view is focusable or if the view contains a focusable 3871 * View, false otherwise. 3872 * 3873 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3874 */ 3875 public boolean hasFocusable() { 3876 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3877 } 3878 3879 /** 3880 * Called by the view system when the focus state of this view changes. 3881 * When the focus change event is caused by directional navigation, direction 3882 * and previouslyFocusedRect provide insight into where the focus is coming from. 3883 * When overriding, be sure to call up through to the super class so that 3884 * the standard focus handling will occur. 3885 * 3886 * @param gainFocus True if the View has focus; false otherwise. 3887 * @param direction The direction focus has moved when requestFocus() 3888 * is called to give this view focus. Values are 3889 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3890 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3891 * It may not always apply, in which case use the default. 3892 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3893 * system, of the previously focused view. If applicable, this will be 3894 * passed in as finer grained information about where the focus is coming 3895 * from (in addition to direction). Will be <code>null</code> otherwise. 3896 */ 3897 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3898 if (gainFocus) { 3899 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3900 } 3901 3902 InputMethodManager imm = InputMethodManager.peekInstance(); 3903 if (!gainFocus) { 3904 if (isPressed()) { 3905 setPressed(false); 3906 } 3907 if (imm != null && mAttachInfo != null 3908 && mAttachInfo.mHasWindowFocus) { 3909 imm.focusOut(this); 3910 } 3911 onFocusLost(); 3912 } else if (imm != null && mAttachInfo != null 3913 && mAttachInfo.mHasWindowFocus) { 3914 imm.focusIn(this); 3915 } 3916 3917 invalidate(true); 3918 ListenerInfo li = mListenerInfo; 3919 if (li != null && li.mOnFocusChangeListener != null) { 3920 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 3921 } 3922 3923 if (mAttachInfo != null) { 3924 mAttachInfo.mKeyDispatchState.reset(this); 3925 } 3926 } 3927 3928 /** 3929 * Sends an accessibility event of the given type. If accessiiblity is 3930 * not enabled this method has no effect. The default implementation calls 3931 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 3932 * to populate information about the event source (this View), then calls 3933 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 3934 * populate the text content of the event source including its descendants, 3935 * and last calls 3936 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 3937 * on its parent to resuest sending of the event to interested parties. 3938 * <p> 3939 * If an {@link AccessibilityDelegate} has been specified via calling 3940 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3941 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 3942 * responsible for handling this call. 3943 * </p> 3944 * 3945 * @param eventType The type of the event to send, as defined by several types from 3946 * {@link android.view.accessibility.AccessibilityEvent}, such as 3947 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 3948 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 3949 * 3950 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 3951 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3952 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 3953 * @see AccessibilityDelegate 3954 */ 3955 public void sendAccessibilityEvent(int eventType) { 3956 if (mAccessibilityDelegate != null) { 3957 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 3958 } else { 3959 sendAccessibilityEventInternal(eventType); 3960 } 3961 } 3962 3963 /** 3964 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 3965 * {@link AccessibilityEvent} to make an announcement which is related to some 3966 * sort of a context change for which none of the events representing UI transitions 3967 * is a good fit. For example, announcing a new page in a book. If accessibility 3968 * is not enabled this method does nothing. 3969 * 3970 * @param text The announcement text. 3971 */ 3972 public void announceForAccessibility(CharSequence text) { 3973 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3974 AccessibilityEvent event = AccessibilityEvent.obtain( 3975 AccessibilityEvent.TYPE_ANNOUNCEMENT); 3976 event.getText().add(text); 3977 sendAccessibilityEventUnchecked(event); 3978 } 3979 } 3980 3981 /** 3982 * @see #sendAccessibilityEvent(int) 3983 * 3984 * Note: Called from the default {@link AccessibilityDelegate}. 3985 */ 3986 void sendAccessibilityEventInternal(int eventType) { 3987 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3988 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3989 } 3990 } 3991 3992 /** 3993 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 3994 * takes as an argument an empty {@link AccessibilityEvent} and does not 3995 * perform a check whether accessibility is enabled. 3996 * <p> 3997 * If an {@link AccessibilityDelegate} has been specified via calling 3998 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3999 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4000 * is responsible for handling this call. 4001 * </p> 4002 * 4003 * @param event The event to send. 4004 * 4005 * @see #sendAccessibilityEvent(int) 4006 */ 4007 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4008 if (mAccessibilityDelegate != null) { 4009 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4010 } else { 4011 sendAccessibilityEventUncheckedInternal(event); 4012 } 4013 } 4014 4015 /** 4016 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4017 * 4018 * Note: Called from the default {@link AccessibilityDelegate}. 4019 */ 4020 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4021 if (!isShown()) { 4022 return; 4023 } 4024 onInitializeAccessibilityEvent(event); 4025 // Only a subset of accessibility events populates text content. 4026 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4027 dispatchPopulateAccessibilityEvent(event); 4028 } 4029 // In the beginning we called #isShown(), so we know that getParent() is not null. 4030 getParent().requestSendAccessibilityEvent(this, event); 4031 } 4032 4033 /** 4034 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4035 * to its children for adding their text content to the event. Note that the 4036 * event text is populated in a separate dispatch path since we add to the 4037 * event not only the text of the source but also the text of all its descendants. 4038 * A typical implementation will call 4039 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4040 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4041 * on each child. Override this method if custom population of the event text 4042 * content is required. 4043 * <p> 4044 * If an {@link AccessibilityDelegate} has been specified via calling 4045 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4046 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4047 * is responsible for handling this call. 4048 * </p> 4049 * <p> 4050 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4051 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4052 * </p> 4053 * 4054 * @param event The event. 4055 * 4056 * @return True if the event population was completed. 4057 */ 4058 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4059 if (mAccessibilityDelegate != null) { 4060 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4061 } else { 4062 return dispatchPopulateAccessibilityEventInternal(event); 4063 } 4064 } 4065 4066 /** 4067 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4068 * 4069 * Note: Called from the default {@link AccessibilityDelegate}. 4070 */ 4071 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4072 onPopulateAccessibilityEvent(event); 4073 return false; 4074 } 4075 4076 /** 4077 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4078 * giving a chance to this View to populate the accessibility event with its 4079 * text content. While this method is free to modify event 4080 * attributes other than text content, doing so should normally be performed in 4081 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4082 * <p> 4083 * Example: Adding formatted date string to an accessibility event in addition 4084 * to the text added by the super implementation: 4085 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4086 * super.onPopulateAccessibilityEvent(event); 4087 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4088 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4089 * mCurrentDate.getTimeInMillis(), flags); 4090 * event.getText().add(selectedDateUtterance); 4091 * }</pre> 4092 * <p> 4093 * If an {@link AccessibilityDelegate} has been specified via calling 4094 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4095 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4096 * is responsible for handling this call. 4097 * </p> 4098 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4099 * information to the event, in case the default implementation has basic information to add. 4100 * </p> 4101 * 4102 * @param event The accessibility event which to populate. 4103 * 4104 * @see #sendAccessibilityEvent(int) 4105 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4106 */ 4107 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4108 if (mAccessibilityDelegate != null) { 4109 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4110 } else { 4111 onPopulateAccessibilityEventInternal(event); 4112 } 4113 } 4114 4115 /** 4116 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4117 * 4118 * Note: Called from the default {@link AccessibilityDelegate}. 4119 */ 4120 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4121 4122 } 4123 4124 /** 4125 * Initializes an {@link AccessibilityEvent} with information about 4126 * this View which is the event source. In other words, the source of 4127 * an accessibility event is the view whose state change triggered firing 4128 * the event. 4129 * <p> 4130 * Example: Setting the password property of an event in addition 4131 * to properties set by the super implementation: 4132 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4133 * super.onInitializeAccessibilityEvent(event); 4134 * event.setPassword(true); 4135 * }</pre> 4136 * <p> 4137 * If an {@link AccessibilityDelegate} has been specified via calling 4138 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4139 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4140 * is responsible for handling this call. 4141 * </p> 4142 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4143 * information to the event, in case the default implementation has basic information to add. 4144 * </p> 4145 * @param event The event to initialize. 4146 * 4147 * @see #sendAccessibilityEvent(int) 4148 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4149 */ 4150 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4151 if (mAccessibilityDelegate != null) { 4152 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4153 } else { 4154 onInitializeAccessibilityEventInternal(event); 4155 } 4156 } 4157 4158 /** 4159 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4160 * 4161 * Note: Called from the default {@link AccessibilityDelegate}. 4162 */ 4163 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4164 event.setSource(this); 4165 event.setClassName(View.class.getName()); 4166 event.setPackageName(getContext().getPackageName()); 4167 event.setEnabled(isEnabled()); 4168 event.setContentDescription(mContentDescription); 4169 4170 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4171 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 4172 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4173 FOCUSABLES_ALL); 4174 event.setItemCount(focusablesTempList.size()); 4175 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4176 focusablesTempList.clear(); 4177 } 4178 } 4179 4180 /** 4181 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4182 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4183 * This method is responsible for obtaining an accessibility node info from a 4184 * pool of reusable instances and calling 4185 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4186 * initialize the former. 4187 * <p> 4188 * Note: The client is responsible for recycling the obtained instance by calling 4189 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4190 * </p> 4191 * 4192 * @return A populated {@link AccessibilityNodeInfo}. 4193 * 4194 * @see AccessibilityNodeInfo 4195 */ 4196 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4197 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4198 if (provider != null) { 4199 return provider.createAccessibilityNodeInfo(View.NO_ID); 4200 } else { 4201 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4202 onInitializeAccessibilityNodeInfo(info); 4203 return info; 4204 } 4205 } 4206 4207 /** 4208 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4209 * The base implementation sets: 4210 * <ul> 4211 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4212 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4213 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4214 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4215 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4216 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4217 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4218 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4219 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4220 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4221 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4222 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4223 * </ul> 4224 * <p> 4225 * Subclasses should override this method, call the super implementation, 4226 * and set additional attributes. 4227 * </p> 4228 * <p> 4229 * If an {@link AccessibilityDelegate} has been specified via calling 4230 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4231 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4232 * is responsible for handling this call. 4233 * </p> 4234 * 4235 * @param info The instance to initialize. 4236 */ 4237 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4238 if (mAccessibilityDelegate != null) { 4239 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4240 } else { 4241 onInitializeAccessibilityNodeInfoInternal(info); 4242 } 4243 } 4244 4245 /** 4246 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4247 * 4248 * Note: Called from the default {@link AccessibilityDelegate}. 4249 */ 4250 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4251 Rect bounds = mAttachInfo.mTmpInvalRect; 4252 getDrawingRect(bounds); 4253 info.setBoundsInParent(bounds); 4254 4255 int[] locationOnScreen = mAttachInfo.mInvalidateChildLocation; 4256 getLocationOnScreen(locationOnScreen); 4257 bounds.offsetTo(0, 0); 4258 bounds.offset(locationOnScreen[0], locationOnScreen[1]); 4259 info.setBoundsInScreen(bounds); 4260 4261 if ((mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 4262 ViewParent parent = getParent(); 4263 if (parent instanceof View) { 4264 View parentView = (View) parent; 4265 info.setParent(parentView); 4266 } 4267 } 4268 4269 info.setPackageName(mContext.getPackageName()); 4270 info.setClassName(View.class.getName()); 4271 info.setContentDescription(getContentDescription()); 4272 4273 info.setEnabled(isEnabled()); 4274 info.setClickable(isClickable()); 4275 info.setFocusable(isFocusable()); 4276 info.setFocused(isFocused()); 4277 info.setSelected(isSelected()); 4278 info.setLongClickable(isLongClickable()); 4279 4280 // TODO: These make sense only if we are in an AdapterView but all 4281 // views can be selected. Maybe from accessiiblity perspective 4282 // we should report as selectable view in an AdapterView. 4283 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4284 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4285 4286 if (isFocusable()) { 4287 if (isFocused()) { 4288 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4289 } else { 4290 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4291 } 4292 } 4293 } 4294 4295 /** 4296 * Sets a delegate for implementing accessibility support via compositon as 4297 * opposed to inheritance. The delegate's primary use is for implementing 4298 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4299 * 4300 * @param delegate The delegate instance. 4301 * 4302 * @see AccessibilityDelegate 4303 */ 4304 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4305 mAccessibilityDelegate = delegate; 4306 } 4307 4308 /** 4309 * Gets the provider for managing a virtual view hierarchy rooted at this View 4310 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4311 * that explore the window content. 4312 * <p> 4313 * If this method returns an instance, this instance is responsible for managing 4314 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4315 * View including the one representing the View itself. Similarly the returned 4316 * instance is responsible for performing accessibility actions on any virtual 4317 * view or the root view itself. 4318 * </p> 4319 * <p> 4320 * If an {@link AccessibilityDelegate} has been specified via calling 4321 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4322 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4323 * is responsible for handling this call. 4324 * </p> 4325 * 4326 * @return The provider. 4327 * 4328 * @see AccessibilityNodeProvider 4329 */ 4330 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4331 if (mAccessibilityDelegate != null) { 4332 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4333 } else { 4334 return null; 4335 } 4336 } 4337 4338 /** 4339 * Gets the unique identifier of this view on the screen for accessibility purposes. 4340 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4341 * 4342 * @return The view accessibility id. 4343 * 4344 * @hide 4345 */ 4346 public int getAccessibilityViewId() { 4347 if (mAccessibilityViewId == NO_ID) { 4348 mAccessibilityViewId = sNextAccessibilityViewId++; 4349 } 4350 return mAccessibilityViewId; 4351 } 4352 4353 /** 4354 * Gets the unique identifier of the window in which this View reseides. 4355 * 4356 * @return The window accessibility id. 4357 * 4358 * @hide 4359 */ 4360 public int getAccessibilityWindowId() { 4361 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4362 } 4363 4364 /** 4365 * Gets the {@link View} description. It briefly describes the view and is 4366 * primarily used for accessibility support. Set this property to enable 4367 * better accessibility support for your application. This is especially 4368 * true for views that do not have textual representation (For example, 4369 * ImageButton). 4370 * 4371 * @return The content descriptiopn. 4372 * 4373 * @attr ref android.R.styleable#View_contentDescription 4374 */ 4375 public CharSequence getContentDescription() { 4376 return mContentDescription; 4377 } 4378 4379 /** 4380 * Sets the {@link View} description. It briefly describes the view and is 4381 * primarily used for accessibility support. Set this property to enable 4382 * better accessibility support for your application. This is especially 4383 * true for views that do not have textual representation (For example, 4384 * ImageButton). 4385 * 4386 * @param contentDescription The content description. 4387 * 4388 * @attr ref android.R.styleable#View_contentDescription 4389 */ 4390 @RemotableViewMethod 4391 public void setContentDescription(CharSequence contentDescription) { 4392 mContentDescription = contentDescription; 4393 } 4394 4395 /** 4396 * Invoked whenever this view loses focus, either by losing window focus or by losing 4397 * focus within its window. This method can be used to clear any state tied to the 4398 * focus. For instance, if a button is held pressed with the trackball and the window 4399 * loses focus, this method can be used to cancel the press. 4400 * 4401 * Subclasses of View overriding this method should always call super.onFocusLost(). 4402 * 4403 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4404 * @see #onWindowFocusChanged(boolean) 4405 * 4406 * @hide pending API council approval 4407 */ 4408 protected void onFocusLost() { 4409 resetPressedState(); 4410 } 4411 4412 private void resetPressedState() { 4413 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4414 return; 4415 } 4416 4417 if (isPressed()) { 4418 setPressed(false); 4419 4420 if (!mHasPerformedLongPress) { 4421 removeLongPressCallback(); 4422 } 4423 } 4424 } 4425 4426 /** 4427 * Returns true if this view has focus 4428 * 4429 * @return True if this view has focus, false otherwise. 4430 */ 4431 @ViewDebug.ExportedProperty(category = "focus") 4432 public boolean isFocused() { 4433 return (mPrivateFlags & FOCUSED) != 0; 4434 } 4435 4436 /** 4437 * Find the view in the hierarchy rooted at this view that currently has 4438 * focus. 4439 * 4440 * @return The view that currently has focus, or null if no focused view can 4441 * be found. 4442 */ 4443 public View findFocus() { 4444 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4445 } 4446 4447 /** 4448 * Change whether this view is one of the set of scrollable containers in 4449 * its window. This will be used to determine whether the window can 4450 * resize or must pan when a soft input area is open -- scrollable 4451 * containers allow the window to use resize mode since the container 4452 * will appropriately shrink. 4453 */ 4454 public void setScrollContainer(boolean isScrollContainer) { 4455 if (isScrollContainer) { 4456 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4457 mAttachInfo.mScrollContainers.add(this); 4458 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4459 } 4460 mPrivateFlags |= SCROLL_CONTAINER; 4461 } else { 4462 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4463 mAttachInfo.mScrollContainers.remove(this); 4464 } 4465 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4466 } 4467 } 4468 4469 /** 4470 * Returns the quality of the drawing cache. 4471 * 4472 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4473 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4474 * 4475 * @see #setDrawingCacheQuality(int) 4476 * @see #setDrawingCacheEnabled(boolean) 4477 * @see #isDrawingCacheEnabled() 4478 * 4479 * @attr ref android.R.styleable#View_drawingCacheQuality 4480 */ 4481 public int getDrawingCacheQuality() { 4482 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4483 } 4484 4485 /** 4486 * Set the drawing cache quality of this view. This value is used only when the 4487 * drawing cache is enabled 4488 * 4489 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4490 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4491 * 4492 * @see #getDrawingCacheQuality() 4493 * @see #setDrawingCacheEnabled(boolean) 4494 * @see #isDrawingCacheEnabled() 4495 * 4496 * @attr ref android.R.styleable#View_drawingCacheQuality 4497 */ 4498 public void setDrawingCacheQuality(int quality) { 4499 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 4500 } 4501 4502 /** 4503 * Returns whether the screen should remain on, corresponding to the current 4504 * value of {@link #KEEP_SCREEN_ON}. 4505 * 4506 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 4507 * 4508 * @see #setKeepScreenOn(boolean) 4509 * 4510 * @attr ref android.R.styleable#View_keepScreenOn 4511 */ 4512 public boolean getKeepScreenOn() { 4513 return (mViewFlags & KEEP_SCREEN_ON) != 0; 4514 } 4515 4516 /** 4517 * Controls whether the screen should remain on, modifying the 4518 * value of {@link #KEEP_SCREEN_ON}. 4519 * 4520 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 4521 * 4522 * @see #getKeepScreenOn() 4523 * 4524 * @attr ref android.R.styleable#View_keepScreenOn 4525 */ 4526 public void setKeepScreenOn(boolean keepScreenOn) { 4527 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 4528 } 4529 4530 /** 4531 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4532 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4533 * 4534 * @attr ref android.R.styleable#View_nextFocusLeft 4535 */ 4536 public int getNextFocusLeftId() { 4537 return mNextFocusLeftId; 4538 } 4539 4540 /** 4541 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4542 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 4543 * decide automatically. 4544 * 4545 * @attr ref android.R.styleable#View_nextFocusLeft 4546 */ 4547 public void setNextFocusLeftId(int nextFocusLeftId) { 4548 mNextFocusLeftId = nextFocusLeftId; 4549 } 4550 4551 /** 4552 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4553 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4554 * 4555 * @attr ref android.R.styleable#View_nextFocusRight 4556 */ 4557 public int getNextFocusRightId() { 4558 return mNextFocusRightId; 4559 } 4560 4561 /** 4562 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4563 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 4564 * decide automatically. 4565 * 4566 * @attr ref android.R.styleable#View_nextFocusRight 4567 */ 4568 public void setNextFocusRightId(int nextFocusRightId) { 4569 mNextFocusRightId = nextFocusRightId; 4570 } 4571 4572 /** 4573 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4574 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4575 * 4576 * @attr ref android.R.styleable#View_nextFocusUp 4577 */ 4578 public int getNextFocusUpId() { 4579 return mNextFocusUpId; 4580 } 4581 4582 /** 4583 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4584 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 4585 * decide automatically. 4586 * 4587 * @attr ref android.R.styleable#View_nextFocusUp 4588 */ 4589 public void setNextFocusUpId(int nextFocusUpId) { 4590 mNextFocusUpId = nextFocusUpId; 4591 } 4592 4593 /** 4594 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4595 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4596 * 4597 * @attr ref android.R.styleable#View_nextFocusDown 4598 */ 4599 public int getNextFocusDownId() { 4600 return mNextFocusDownId; 4601 } 4602 4603 /** 4604 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4605 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 4606 * decide automatically. 4607 * 4608 * @attr ref android.R.styleable#View_nextFocusDown 4609 */ 4610 public void setNextFocusDownId(int nextFocusDownId) { 4611 mNextFocusDownId = nextFocusDownId; 4612 } 4613 4614 /** 4615 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4616 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4617 * 4618 * @attr ref android.R.styleable#View_nextFocusForward 4619 */ 4620 public int getNextFocusForwardId() { 4621 return mNextFocusForwardId; 4622 } 4623 4624 /** 4625 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4626 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 4627 * decide automatically. 4628 * 4629 * @attr ref android.R.styleable#View_nextFocusForward 4630 */ 4631 public void setNextFocusForwardId(int nextFocusForwardId) { 4632 mNextFocusForwardId = nextFocusForwardId; 4633 } 4634 4635 /** 4636 * Returns the visibility of this view and all of its ancestors 4637 * 4638 * @return True if this view and all of its ancestors are {@link #VISIBLE} 4639 */ 4640 public boolean isShown() { 4641 View current = this; 4642 //noinspection ConstantConditions 4643 do { 4644 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4645 return false; 4646 } 4647 ViewParent parent = current.mParent; 4648 if (parent == null) { 4649 return false; // We are not attached to the view root 4650 } 4651 if (!(parent instanceof View)) { 4652 return true; 4653 } 4654 current = (View) parent; 4655 } while (current != null); 4656 4657 return false; 4658 } 4659 4660 /** 4661 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 4662 * is set 4663 * 4664 * @param insets Insets for system windows 4665 * 4666 * @return True if this view applied the insets, false otherwise 4667 */ 4668 protected boolean fitSystemWindows(Rect insets) { 4669 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 4670 mPaddingLeft = insets.left; 4671 mPaddingTop = insets.top; 4672 mPaddingRight = insets.right; 4673 mPaddingBottom = insets.bottom; 4674 requestLayout(); 4675 return true; 4676 } 4677 return false; 4678 } 4679 4680 /** 4681 * Set whether or not this view should account for system screen decorations 4682 * such as the status bar and inset its content. This allows this view to be 4683 * positioned in absolute screen coordinates and remain visible to the user. 4684 * 4685 * <p>This should only be used by top-level window decor views. 4686 * 4687 * @param fitSystemWindows true to inset content for system screen decorations, false for 4688 * default behavior. 4689 * 4690 * @attr ref android.R.styleable#View_fitsSystemWindows 4691 */ 4692 public void setFitsSystemWindows(boolean fitSystemWindows) { 4693 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 4694 } 4695 4696 /** 4697 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 4698 * will account for system screen decorations such as the status bar and inset its 4699 * content. This allows the view to be positioned in absolute screen coordinates 4700 * and remain visible to the user. 4701 * 4702 * @return true if this view will adjust its content bounds for system screen decorations. 4703 * 4704 * @attr ref android.R.styleable#View_fitsSystemWindows 4705 */ 4706 public boolean fitsSystemWindows() { 4707 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 4708 } 4709 4710 /** 4711 * Returns the visibility status for this view. 4712 * 4713 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4714 * @attr ref android.R.styleable#View_visibility 4715 */ 4716 @ViewDebug.ExportedProperty(mapping = { 4717 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 4718 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 4719 @ViewDebug.IntToString(from = GONE, to = "GONE") 4720 }) 4721 public int getVisibility() { 4722 return mViewFlags & VISIBILITY_MASK; 4723 } 4724 4725 /** 4726 * Set the enabled state of this view. 4727 * 4728 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4729 * @attr ref android.R.styleable#View_visibility 4730 */ 4731 @RemotableViewMethod 4732 public void setVisibility(int visibility) { 4733 setFlags(visibility, VISIBILITY_MASK); 4734 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 4735 } 4736 4737 /** 4738 * Returns the enabled status for this view. The interpretation of the 4739 * enabled state varies by subclass. 4740 * 4741 * @return True if this view is enabled, false otherwise. 4742 */ 4743 @ViewDebug.ExportedProperty 4744 public boolean isEnabled() { 4745 return (mViewFlags & ENABLED_MASK) == ENABLED; 4746 } 4747 4748 /** 4749 * Set the enabled state of this view. The interpretation of the enabled 4750 * state varies by subclass. 4751 * 4752 * @param enabled True if this view is enabled, false otherwise. 4753 */ 4754 @RemotableViewMethod 4755 public void setEnabled(boolean enabled) { 4756 if (enabled == isEnabled()) return; 4757 4758 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 4759 4760 /* 4761 * The View most likely has to change its appearance, so refresh 4762 * the drawable state. 4763 */ 4764 refreshDrawableState(); 4765 4766 // Invalidate too, since the default behavior for views is to be 4767 // be drawn at 50% alpha rather than to change the drawable. 4768 invalidate(true); 4769 } 4770 4771 /** 4772 * Set whether this view can receive the focus. 4773 * 4774 * Setting this to false will also ensure that this view is not focusable 4775 * in touch mode. 4776 * 4777 * @param focusable If true, this view can receive the focus. 4778 * 4779 * @see #setFocusableInTouchMode(boolean) 4780 * @attr ref android.R.styleable#View_focusable 4781 */ 4782 public void setFocusable(boolean focusable) { 4783 if (!focusable) { 4784 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 4785 } 4786 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 4787 } 4788 4789 /** 4790 * Set whether this view can receive focus while in touch mode. 4791 * 4792 * Setting this to true will also ensure that this view is focusable. 4793 * 4794 * @param focusableInTouchMode If true, this view can receive the focus while 4795 * in touch mode. 4796 * 4797 * @see #setFocusable(boolean) 4798 * @attr ref android.R.styleable#View_focusableInTouchMode 4799 */ 4800 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 4801 // Focusable in touch mode should always be set before the focusable flag 4802 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 4803 // which, in touch mode, will not successfully request focus on this view 4804 // because the focusable in touch mode flag is not set 4805 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 4806 if (focusableInTouchMode) { 4807 setFlags(FOCUSABLE, FOCUSABLE_MASK); 4808 } 4809 } 4810 4811 /** 4812 * Set whether this view should have sound effects enabled for events such as 4813 * clicking and touching. 4814 * 4815 * <p>You may wish to disable sound effects for a view if you already play sounds, 4816 * for instance, a dial key that plays dtmf tones. 4817 * 4818 * @param soundEffectsEnabled whether sound effects are enabled for this view. 4819 * @see #isSoundEffectsEnabled() 4820 * @see #playSoundEffect(int) 4821 * @attr ref android.R.styleable#View_soundEffectsEnabled 4822 */ 4823 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 4824 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 4825 } 4826 4827 /** 4828 * @return whether this view should have sound effects enabled for events such as 4829 * clicking and touching. 4830 * 4831 * @see #setSoundEffectsEnabled(boolean) 4832 * @see #playSoundEffect(int) 4833 * @attr ref android.R.styleable#View_soundEffectsEnabled 4834 */ 4835 @ViewDebug.ExportedProperty 4836 public boolean isSoundEffectsEnabled() { 4837 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 4838 } 4839 4840 /** 4841 * Set whether this view should have haptic feedback for events such as 4842 * long presses. 4843 * 4844 * <p>You may wish to disable haptic feedback if your view already controls 4845 * its own haptic feedback. 4846 * 4847 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 4848 * @see #isHapticFeedbackEnabled() 4849 * @see #performHapticFeedback(int) 4850 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4851 */ 4852 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 4853 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 4854 } 4855 4856 /** 4857 * @return whether this view should have haptic feedback enabled for events 4858 * long presses. 4859 * 4860 * @see #setHapticFeedbackEnabled(boolean) 4861 * @see #performHapticFeedback(int) 4862 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4863 */ 4864 @ViewDebug.ExportedProperty 4865 public boolean isHapticFeedbackEnabled() { 4866 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 4867 } 4868 4869 /** 4870 * Returns the layout direction for this view. 4871 * 4872 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 4873 * {@link #LAYOUT_DIRECTION_RTL}, 4874 * {@link #LAYOUT_DIRECTION_INHERIT} or 4875 * {@link #LAYOUT_DIRECTION_LOCALE}. 4876 * @attr ref android.R.styleable#View_layoutDirection 4877 */ 4878 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4879 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 4880 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 4881 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 4882 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 4883 }) 4884 public int getLayoutDirection() { 4885 return mViewFlags & LAYOUT_DIRECTION_MASK; 4886 } 4887 4888 /** 4889 * Set the layout direction for this view. This will propagate a reset of layout direction 4890 * resolution to the view's children and resolve layout direction for this view. 4891 * 4892 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 4893 * {@link #LAYOUT_DIRECTION_RTL}, 4894 * {@link #LAYOUT_DIRECTION_INHERIT} or 4895 * {@link #LAYOUT_DIRECTION_LOCALE}. 4896 * 4897 * @attr ref android.R.styleable#View_layoutDirection 4898 */ 4899 @RemotableViewMethod 4900 public void setLayoutDirection(int layoutDirection) { 4901 if (getLayoutDirection() != layoutDirection) { 4902 resetResolvedLayoutDirection(); 4903 // Setting the flag will also request a layout. 4904 setFlags(layoutDirection, LAYOUT_DIRECTION_MASK); 4905 } 4906 } 4907 4908 /** 4909 * Returns the resolved layout direction for this view. 4910 * 4911 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 4912 * {@link #LAYOUT_DIRECTION_LTR} id the layout direction is not RTL. 4913 */ 4914 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4915 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 4916 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 4917 }) 4918 public int getResolvedLayoutDirection() { 4919 resolveLayoutDirectionIfNeeded(); 4920 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 4921 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 4922 } 4923 4924 /** 4925 * <p>Indicates whether or not this view's layout is right-to-left. This is resolved from 4926 * layout attribute and/or the inherited value from the parent.</p> 4927 * 4928 * @return true if the layout is right-to-left. 4929 */ 4930 @ViewDebug.ExportedProperty(category = "layout") 4931 public boolean isLayoutRtl() { 4932 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 4933 } 4934 4935 /** 4936 * Indicates whether the view is currently tracking transient state that the 4937 * app should not need to concern itself with saving and restoring, but that 4938 * the framework should take special note to preserve when possible. 4939 * 4940 * @return true if the view has transient state 4941 */ 4942 @ViewDebug.ExportedProperty(category = "layout") 4943 public boolean hasTransientState() { 4944 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 4945 } 4946 4947 /** 4948 * Set whether this view is currently tracking transient state that the 4949 * framework should attempt to preserve when possible. 4950 * 4951 * @param hasTransientState true if this view has transient state 4952 */ 4953 public void setHasTransientState(boolean hasTransientState) { 4954 if (hasTransientState() == hasTransientState) return; 4955 4956 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 4957 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 4958 if (mParent != null) { 4959 try { 4960 mParent.childHasTransientStateChanged(this, hasTransientState); 4961 } catch (AbstractMethodError e) { 4962 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 4963 " does not fully implement ViewParent", e); 4964 } 4965 } 4966 } 4967 4968 /** 4969 * If this view doesn't do any drawing on its own, set this flag to 4970 * allow further optimizations. By default, this flag is not set on 4971 * View, but could be set on some View subclasses such as ViewGroup. 4972 * 4973 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 4974 * you should clear this flag. 4975 * 4976 * @param willNotDraw whether or not this View draw on its own 4977 */ 4978 public void setWillNotDraw(boolean willNotDraw) { 4979 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 4980 } 4981 4982 /** 4983 * Returns whether or not this View draws on its own. 4984 * 4985 * @return true if this view has nothing to draw, false otherwise 4986 */ 4987 @ViewDebug.ExportedProperty(category = "drawing") 4988 public boolean willNotDraw() { 4989 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 4990 } 4991 4992 /** 4993 * When a View's drawing cache is enabled, drawing is redirected to an 4994 * offscreen bitmap. Some views, like an ImageView, must be able to 4995 * bypass this mechanism if they already draw a single bitmap, to avoid 4996 * unnecessary usage of the memory. 4997 * 4998 * @param willNotCacheDrawing true if this view does not cache its 4999 * drawing, false otherwise 5000 */ 5001 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5002 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5003 } 5004 5005 /** 5006 * Returns whether or not this View can cache its drawing or not. 5007 * 5008 * @return true if this view does not cache its drawing, false otherwise 5009 */ 5010 @ViewDebug.ExportedProperty(category = "drawing") 5011 public boolean willNotCacheDrawing() { 5012 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5013 } 5014 5015 /** 5016 * Indicates whether this view reacts to click events or not. 5017 * 5018 * @return true if the view is clickable, false otherwise 5019 * 5020 * @see #setClickable(boolean) 5021 * @attr ref android.R.styleable#View_clickable 5022 */ 5023 @ViewDebug.ExportedProperty 5024 public boolean isClickable() { 5025 return (mViewFlags & CLICKABLE) == CLICKABLE; 5026 } 5027 5028 /** 5029 * Enables or disables click events for this view. When a view 5030 * is clickable it will change its state to "pressed" on every click. 5031 * Subclasses should set the view clickable to visually react to 5032 * user's clicks. 5033 * 5034 * @param clickable true to make the view clickable, false otherwise 5035 * 5036 * @see #isClickable() 5037 * @attr ref android.R.styleable#View_clickable 5038 */ 5039 public void setClickable(boolean clickable) { 5040 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5041 } 5042 5043 /** 5044 * Indicates whether this view reacts to long click events or not. 5045 * 5046 * @return true if the view is long clickable, false otherwise 5047 * 5048 * @see #setLongClickable(boolean) 5049 * @attr ref android.R.styleable#View_longClickable 5050 */ 5051 public boolean isLongClickable() { 5052 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5053 } 5054 5055 /** 5056 * Enables or disables long click events for this view. When a view is long 5057 * clickable it reacts to the user holding down the button for a longer 5058 * duration than a tap. This event can either launch the listener or a 5059 * context menu. 5060 * 5061 * @param longClickable true to make the view long clickable, false otherwise 5062 * @see #isLongClickable() 5063 * @attr ref android.R.styleable#View_longClickable 5064 */ 5065 public void setLongClickable(boolean longClickable) { 5066 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5067 } 5068 5069 /** 5070 * Sets the pressed state for this view. 5071 * 5072 * @see #isClickable() 5073 * @see #setClickable(boolean) 5074 * 5075 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5076 * the View's internal state from a previously set "pressed" state. 5077 */ 5078 public void setPressed(boolean pressed) { 5079 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5080 5081 if (pressed) { 5082 mPrivateFlags |= PRESSED; 5083 } else { 5084 mPrivateFlags &= ~PRESSED; 5085 } 5086 5087 if (needsRefresh) { 5088 refreshDrawableState(); 5089 } 5090 dispatchSetPressed(pressed); 5091 } 5092 5093 /** 5094 * Dispatch setPressed to all of this View's children. 5095 * 5096 * @see #setPressed(boolean) 5097 * 5098 * @param pressed The new pressed state 5099 */ 5100 protected void dispatchSetPressed(boolean pressed) { 5101 } 5102 5103 /** 5104 * Indicates whether the view is currently in pressed state. Unless 5105 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5106 * the pressed state. 5107 * 5108 * @see #setPressed(boolean) 5109 * @see #isClickable() 5110 * @see #setClickable(boolean) 5111 * 5112 * @return true if the view is currently pressed, false otherwise 5113 */ 5114 public boolean isPressed() { 5115 return (mPrivateFlags & PRESSED) == PRESSED; 5116 } 5117 5118 /** 5119 * Indicates whether this view will save its state (that is, 5120 * whether its {@link #onSaveInstanceState} method will be called). 5121 * 5122 * @return Returns true if the view state saving is enabled, else false. 5123 * 5124 * @see #setSaveEnabled(boolean) 5125 * @attr ref android.R.styleable#View_saveEnabled 5126 */ 5127 public boolean isSaveEnabled() { 5128 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5129 } 5130 5131 /** 5132 * Controls whether the saving of this view's state is 5133 * enabled (that is, whether its {@link #onSaveInstanceState} method 5134 * will be called). Note that even if freezing is enabled, the 5135 * view still must have an id assigned to it (via {@link #setId(int)}) 5136 * for its state to be saved. This flag can only disable the 5137 * saving of this view; any child views may still have their state saved. 5138 * 5139 * @param enabled Set to false to <em>disable</em> state saving, or true 5140 * (the default) to allow it. 5141 * 5142 * @see #isSaveEnabled() 5143 * @see #setId(int) 5144 * @see #onSaveInstanceState() 5145 * @attr ref android.R.styleable#View_saveEnabled 5146 */ 5147 public void setSaveEnabled(boolean enabled) { 5148 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5149 } 5150 5151 /** 5152 * Gets whether the framework should discard touches when the view's 5153 * window is obscured by another visible window. 5154 * Refer to the {@link View} security documentation for more details. 5155 * 5156 * @return True if touch filtering is enabled. 5157 * 5158 * @see #setFilterTouchesWhenObscured(boolean) 5159 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5160 */ 5161 @ViewDebug.ExportedProperty 5162 public boolean getFilterTouchesWhenObscured() { 5163 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5164 } 5165 5166 /** 5167 * Sets whether the framework should discard touches when the view's 5168 * window is obscured by another visible window. 5169 * Refer to the {@link View} security documentation for more details. 5170 * 5171 * @param enabled True if touch filtering should be enabled. 5172 * 5173 * @see #getFilterTouchesWhenObscured 5174 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5175 */ 5176 public void setFilterTouchesWhenObscured(boolean enabled) { 5177 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5178 FILTER_TOUCHES_WHEN_OBSCURED); 5179 } 5180 5181 /** 5182 * Indicates whether the entire hierarchy under this view will save its 5183 * state when a state saving traversal occurs from its parent. The default 5184 * is true; if false, these views will not be saved unless 5185 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5186 * 5187 * @return Returns true if the view state saving from parent is enabled, else false. 5188 * 5189 * @see #setSaveFromParentEnabled(boolean) 5190 */ 5191 public boolean isSaveFromParentEnabled() { 5192 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5193 } 5194 5195 /** 5196 * Controls whether the entire hierarchy under this view will save its 5197 * state when a state saving traversal occurs from its parent. The default 5198 * is true; if false, these views will not be saved unless 5199 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5200 * 5201 * @param enabled Set to false to <em>disable</em> state saving, or true 5202 * (the default) to allow it. 5203 * 5204 * @see #isSaveFromParentEnabled() 5205 * @see #setId(int) 5206 * @see #onSaveInstanceState() 5207 */ 5208 public void setSaveFromParentEnabled(boolean enabled) { 5209 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5210 } 5211 5212 5213 /** 5214 * Returns whether this View is able to take focus. 5215 * 5216 * @return True if this view can take focus, or false otherwise. 5217 * @attr ref android.R.styleable#View_focusable 5218 */ 5219 @ViewDebug.ExportedProperty(category = "focus") 5220 public final boolean isFocusable() { 5221 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5222 } 5223 5224 /** 5225 * When a view is focusable, it may not want to take focus when in touch mode. 5226 * For example, a button would like focus when the user is navigating via a D-pad 5227 * so that the user can click on it, but once the user starts touching the screen, 5228 * the button shouldn't take focus 5229 * @return Whether the view is focusable in touch mode. 5230 * @attr ref android.R.styleable#View_focusableInTouchMode 5231 */ 5232 @ViewDebug.ExportedProperty 5233 public final boolean isFocusableInTouchMode() { 5234 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5235 } 5236 5237 /** 5238 * Find the nearest view in the specified direction that can take focus. 5239 * This does not actually give focus to that view. 5240 * 5241 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5242 * 5243 * @return The nearest focusable in the specified direction, or null if none 5244 * can be found. 5245 */ 5246 public View focusSearch(int direction) { 5247 if (mParent != null) { 5248 return mParent.focusSearch(this, direction); 5249 } else { 5250 return null; 5251 } 5252 } 5253 5254 /** 5255 * This method is the last chance for the focused view and its ancestors to 5256 * respond to an arrow key. This is called when the focused view did not 5257 * consume the key internally, nor could the view system find a new view in 5258 * the requested direction to give focus to. 5259 * 5260 * @param focused The currently focused view. 5261 * @param direction The direction focus wants to move. One of FOCUS_UP, 5262 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5263 * @return True if the this view consumed this unhandled move. 5264 */ 5265 public boolean dispatchUnhandledMove(View focused, int direction) { 5266 return false; 5267 } 5268 5269 /** 5270 * If a user manually specified the next view id for a particular direction, 5271 * use the root to look up the view. 5272 * @param root The root view of the hierarchy containing this view. 5273 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5274 * or FOCUS_BACKWARD. 5275 * @return The user specified next view, or null if there is none. 5276 */ 5277 View findUserSetNextFocus(View root, int direction) { 5278 switch (direction) { 5279 case FOCUS_LEFT: 5280 if (mNextFocusLeftId == View.NO_ID) return null; 5281 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5282 case FOCUS_RIGHT: 5283 if (mNextFocusRightId == View.NO_ID) return null; 5284 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5285 case FOCUS_UP: 5286 if (mNextFocusUpId == View.NO_ID) return null; 5287 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5288 case FOCUS_DOWN: 5289 if (mNextFocusDownId == View.NO_ID) return null; 5290 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5291 case FOCUS_FORWARD: 5292 if (mNextFocusForwardId == View.NO_ID) return null; 5293 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5294 case FOCUS_BACKWARD: { 5295 if (mID == View.NO_ID) return null; 5296 final int id = mID; 5297 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5298 @Override 5299 public boolean apply(View t) { 5300 return t.mNextFocusForwardId == id; 5301 } 5302 }); 5303 } 5304 } 5305 return null; 5306 } 5307 5308 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5309 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5310 @Override 5311 public boolean apply(View t) { 5312 return t.mID == childViewId; 5313 } 5314 }); 5315 5316 if (result == null) { 5317 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5318 + "by user for id " + childViewId); 5319 } 5320 return result; 5321 } 5322 5323 /** 5324 * Find and return all focusable views that are descendants of this view, 5325 * possibly including this view if it is focusable itself. 5326 * 5327 * @param direction The direction of the focus 5328 * @return A list of focusable views 5329 */ 5330 public ArrayList<View> getFocusables(int direction) { 5331 ArrayList<View> result = new ArrayList<View>(24); 5332 addFocusables(result, direction); 5333 return result; 5334 } 5335 5336 /** 5337 * Add any focusable views that are descendants of this view (possibly 5338 * including this view if it is focusable itself) to views. If we are in touch mode, 5339 * only add views that are also focusable in touch mode. 5340 * 5341 * @param views Focusable views found so far 5342 * @param direction The direction of the focus 5343 */ 5344 public void addFocusables(ArrayList<View> views, int direction) { 5345 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 5346 } 5347 5348 /** 5349 * Adds any focusable views that are descendants of this view (possibly 5350 * including this view if it is focusable itself) to views. This method 5351 * adds all focusable views regardless if we are in touch mode or 5352 * only views focusable in touch mode if we are in touch mode depending on 5353 * the focusable mode paramater. 5354 * 5355 * @param views Focusable views found so far or null if all we are interested is 5356 * the number of focusables. 5357 * @param direction The direction of the focus. 5358 * @param focusableMode The type of focusables to be added. 5359 * 5360 * @see #FOCUSABLES_ALL 5361 * @see #FOCUSABLES_TOUCH_MODE 5362 */ 5363 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 5364 if (!isFocusable()) { 5365 return; 5366 } 5367 5368 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 5369 isInTouchMode() && !isFocusableInTouchMode()) { 5370 return; 5371 } 5372 5373 if (views != null) { 5374 views.add(this); 5375 } 5376 } 5377 5378 /** 5379 * Finds the Views that contain given text. The containment is case insensitive. 5380 * The search is performed by either the text that the View renders or the content 5381 * description that describes the view for accessibility purposes and the view does 5382 * not render or both. Clients can specify how the search is to be performed via 5383 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 5384 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 5385 * 5386 * @param outViews The output list of matching Views. 5387 * @param searched The text to match against. 5388 * 5389 * @see #FIND_VIEWS_WITH_TEXT 5390 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 5391 * @see #setContentDescription(CharSequence) 5392 */ 5393 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 5394 if (getAccessibilityNodeProvider() != null) { 5395 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 5396 outViews.add(this); 5397 } 5398 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 5399 && !TextUtils.isEmpty(searched) && !TextUtils.isEmpty(mContentDescription)) { 5400 String searchedLowerCase = searched.toString().toLowerCase(); 5401 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 5402 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 5403 outViews.add(this); 5404 } 5405 } 5406 } 5407 5408 /** 5409 * Find and return all touchable views that are descendants of this view, 5410 * possibly including this view if it is touchable itself. 5411 * 5412 * @return A list of touchable views 5413 */ 5414 public ArrayList<View> getTouchables() { 5415 ArrayList<View> result = new ArrayList<View>(); 5416 addTouchables(result); 5417 return result; 5418 } 5419 5420 /** 5421 * Add any touchable views that are descendants of this view (possibly 5422 * including this view if it is touchable itself) to views. 5423 * 5424 * @param views Touchable views found so far 5425 */ 5426 public void addTouchables(ArrayList<View> views) { 5427 final int viewFlags = mViewFlags; 5428 5429 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 5430 && (viewFlags & ENABLED_MASK) == ENABLED) { 5431 views.add(this); 5432 } 5433 } 5434 5435 /** 5436 * Call this to try to give focus to a specific view or to one of its 5437 * descendants. 5438 * 5439 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5440 * false), or if it is focusable and it is not focusable in touch mode 5441 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5442 * 5443 * See also {@link #focusSearch(int)}, which is what you call to say that you 5444 * have focus, and you want your parent to look for the next one. 5445 * 5446 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 5447 * {@link #FOCUS_DOWN} and <code>null</code>. 5448 * 5449 * @return Whether this view or one of its descendants actually took focus. 5450 */ 5451 public final boolean requestFocus() { 5452 return requestFocus(View.FOCUS_DOWN); 5453 } 5454 5455 5456 /** 5457 * Call this to try to give focus to a specific view or to one of its 5458 * descendants and give it a hint about what direction focus is heading. 5459 * 5460 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5461 * false), or if it is focusable and it is not focusable in touch mode 5462 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5463 * 5464 * See also {@link #focusSearch(int)}, which is what you call to say that you 5465 * have focus, and you want your parent to look for the next one. 5466 * 5467 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 5468 * <code>null</code> set for the previously focused rectangle. 5469 * 5470 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5471 * @return Whether this view or one of its descendants actually took focus. 5472 */ 5473 public final boolean requestFocus(int direction) { 5474 return requestFocus(direction, null); 5475 } 5476 5477 /** 5478 * Call this to try to give focus to a specific view or to one of its descendants 5479 * and give it hints about the direction and a specific rectangle that the focus 5480 * is coming from. The rectangle can help give larger views a finer grained hint 5481 * about where focus is coming from, and therefore, where to show selection, or 5482 * forward focus change internally. 5483 * 5484 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5485 * false), or if it is focusable and it is not focusable in touch mode 5486 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5487 * 5488 * A View will not take focus if it is not visible. 5489 * 5490 * A View will not take focus if one of its parents has 5491 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 5492 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 5493 * 5494 * See also {@link #focusSearch(int)}, which is what you call to say that you 5495 * have focus, and you want your parent to look for the next one. 5496 * 5497 * You may wish to override this method if your custom {@link View} has an internal 5498 * {@link View} that it wishes to forward the request to. 5499 * 5500 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5501 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 5502 * to give a finer grained hint about where focus is coming from. May be null 5503 * if there is no hint. 5504 * @return Whether this view or one of its descendants actually took focus. 5505 */ 5506 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 5507 // need to be focusable 5508 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 5509 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5510 return false; 5511 } 5512 5513 // need to be focusable in touch mode if in touch mode 5514 if (isInTouchMode() && 5515 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 5516 return false; 5517 } 5518 5519 // need to not have any parents blocking us 5520 if (hasAncestorThatBlocksDescendantFocus()) { 5521 return false; 5522 } 5523 5524 handleFocusGainInternal(direction, previouslyFocusedRect); 5525 return true; 5526 } 5527 5528 /** 5529 * Call this to try to give focus to a specific view or to one of its descendants. This is a 5530 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 5531 * touch mode to request focus when they are touched. 5532 * 5533 * @return Whether this view or one of its descendants actually took focus. 5534 * 5535 * @see #isInTouchMode() 5536 * 5537 */ 5538 public final boolean requestFocusFromTouch() { 5539 // Leave touch mode if we need to 5540 if (isInTouchMode()) { 5541 ViewRootImpl viewRoot = getViewRootImpl(); 5542 if (viewRoot != null) { 5543 viewRoot.ensureTouchMode(false); 5544 } 5545 } 5546 return requestFocus(View.FOCUS_DOWN); 5547 } 5548 5549 /** 5550 * @return Whether any ancestor of this view blocks descendant focus. 5551 */ 5552 private boolean hasAncestorThatBlocksDescendantFocus() { 5553 ViewParent ancestor = mParent; 5554 while (ancestor instanceof ViewGroup) { 5555 final ViewGroup vgAncestor = (ViewGroup) ancestor; 5556 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 5557 return true; 5558 } else { 5559 ancestor = vgAncestor.getParent(); 5560 } 5561 } 5562 return false; 5563 } 5564 5565 /** 5566 * @hide 5567 */ 5568 public void dispatchStartTemporaryDetach() { 5569 onStartTemporaryDetach(); 5570 } 5571 5572 /** 5573 * This is called when a container is going to temporarily detach a child, with 5574 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 5575 * It will either be followed by {@link #onFinishTemporaryDetach()} or 5576 * {@link #onDetachedFromWindow()} when the container is done. 5577 */ 5578 public void onStartTemporaryDetach() { 5579 removeUnsetPressCallback(); 5580 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 5581 } 5582 5583 /** 5584 * @hide 5585 */ 5586 public void dispatchFinishTemporaryDetach() { 5587 onFinishTemporaryDetach(); 5588 } 5589 5590 /** 5591 * Called after {@link #onStartTemporaryDetach} when the container is done 5592 * changing the view. 5593 */ 5594 public void onFinishTemporaryDetach() { 5595 } 5596 5597 /** 5598 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 5599 * for this view's window. Returns null if the view is not currently attached 5600 * to the window. Normally you will not need to use this directly, but 5601 * just use the standard high-level event callbacks like 5602 * {@link #onKeyDown(int, KeyEvent)}. 5603 */ 5604 public KeyEvent.DispatcherState getKeyDispatcherState() { 5605 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 5606 } 5607 5608 /** 5609 * Dispatch a key event before it is processed by any input method 5610 * associated with the view hierarchy. This can be used to intercept 5611 * key events in special situations before the IME consumes them; a 5612 * typical example would be handling the BACK key to update the application's 5613 * UI instead of allowing the IME to see it and close itself. 5614 * 5615 * @param event The key event to be dispatched. 5616 * @return True if the event was handled, false otherwise. 5617 */ 5618 public boolean dispatchKeyEventPreIme(KeyEvent event) { 5619 return onKeyPreIme(event.getKeyCode(), event); 5620 } 5621 5622 /** 5623 * Dispatch a key event to the next view on the focus path. This path runs 5624 * from the top of the view tree down to the currently focused view. If this 5625 * view has focus, it will dispatch to itself. Otherwise it will dispatch 5626 * the next node down the focus path. This method also fires any key 5627 * listeners. 5628 * 5629 * @param event The key event to be dispatched. 5630 * @return True if the event was handled, false otherwise. 5631 */ 5632 public boolean dispatchKeyEvent(KeyEvent event) { 5633 if (mInputEventConsistencyVerifier != null) { 5634 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 5635 } 5636 5637 // Give any attached key listener a first crack at the event. 5638 //noinspection SimplifiableIfStatement 5639 ListenerInfo li = mListenerInfo; 5640 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5641 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 5642 return true; 5643 } 5644 5645 if (event.dispatch(this, mAttachInfo != null 5646 ? mAttachInfo.mKeyDispatchState : null, this)) { 5647 return true; 5648 } 5649 5650 if (mInputEventConsistencyVerifier != null) { 5651 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5652 } 5653 return false; 5654 } 5655 5656 /** 5657 * Dispatches a key shortcut event. 5658 * 5659 * @param event The key event to be dispatched. 5660 * @return True if the event was handled by the view, false otherwise. 5661 */ 5662 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 5663 return onKeyShortcut(event.getKeyCode(), event); 5664 } 5665 5666 /** 5667 * Pass the touch screen motion event down to the target view, or this 5668 * view if it is the target. 5669 * 5670 * @param event The motion event to be dispatched. 5671 * @return True if the event was handled by the view, false otherwise. 5672 */ 5673 public boolean dispatchTouchEvent(MotionEvent event) { 5674 if (mInputEventConsistencyVerifier != null) { 5675 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 5676 } 5677 5678 if (onFilterTouchEventForSecurity(event)) { 5679 //noinspection SimplifiableIfStatement 5680 ListenerInfo li = mListenerInfo; 5681 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5682 && li.mOnTouchListener.onTouch(this, event)) { 5683 return true; 5684 } 5685 5686 if (onTouchEvent(event)) { 5687 return true; 5688 } 5689 } 5690 5691 if (mInputEventConsistencyVerifier != null) { 5692 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5693 } 5694 return false; 5695 } 5696 5697 /** 5698 * Filter the touch event to apply security policies. 5699 * 5700 * @param event The motion event to be filtered. 5701 * @return True if the event should be dispatched, false if the event should be dropped. 5702 * 5703 * @see #getFilterTouchesWhenObscured 5704 */ 5705 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 5706 //noinspection RedundantIfStatement 5707 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 5708 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 5709 // Window is obscured, drop this touch. 5710 return false; 5711 } 5712 return true; 5713 } 5714 5715 /** 5716 * Pass a trackball motion event down to the focused view. 5717 * 5718 * @param event The motion event to be dispatched. 5719 * @return True if the event was handled by the view, false otherwise. 5720 */ 5721 public boolean dispatchTrackballEvent(MotionEvent event) { 5722 if (mInputEventConsistencyVerifier != null) { 5723 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 5724 } 5725 5726 return onTrackballEvent(event); 5727 } 5728 5729 /** 5730 * Dispatch a generic motion event. 5731 * <p> 5732 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5733 * are delivered to the view under the pointer. All other generic motion events are 5734 * delivered to the focused view. Hover events are handled specially and are delivered 5735 * to {@link #onHoverEvent(MotionEvent)}. 5736 * </p> 5737 * 5738 * @param event The motion event to be dispatched. 5739 * @return True if the event was handled by the view, false otherwise. 5740 */ 5741 public boolean dispatchGenericMotionEvent(MotionEvent event) { 5742 if (mInputEventConsistencyVerifier != null) { 5743 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 5744 } 5745 5746 final int source = event.getSource(); 5747 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5748 final int action = event.getAction(); 5749 if (action == MotionEvent.ACTION_HOVER_ENTER 5750 || action == MotionEvent.ACTION_HOVER_MOVE 5751 || action == MotionEvent.ACTION_HOVER_EXIT) { 5752 if (dispatchHoverEvent(event)) { 5753 return true; 5754 } 5755 } else if (dispatchGenericPointerEvent(event)) { 5756 return true; 5757 } 5758 } else if (dispatchGenericFocusedEvent(event)) { 5759 return true; 5760 } 5761 5762 if (dispatchGenericMotionEventInternal(event)) { 5763 return true; 5764 } 5765 5766 if (mInputEventConsistencyVerifier != null) { 5767 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5768 } 5769 return false; 5770 } 5771 5772 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 5773 //noinspection SimplifiableIfStatement 5774 ListenerInfo li = mListenerInfo; 5775 if (li != null && li.mOnGenericMotionListener != null 5776 && (mViewFlags & ENABLED_MASK) == ENABLED 5777 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 5778 return true; 5779 } 5780 5781 if (onGenericMotionEvent(event)) { 5782 return true; 5783 } 5784 5785 if (mInputEventConsistencyVerifier != null) { 5786 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5787 } 5788 return false; 5789 } 5790 5791 /** 5792 * Dispatch a hover event. 5793 * <p> 5794 * Do not call this method directly. 5795 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5796 * </p> 5797 * 5798 * @param event The motion event to be dispatched. 5799 * @return True if the event was handled by the view, false otherwise. 5800 */ 5801 protected boolean dispatchHoverEvent(MotionEvent event) { 5802 //noinspection SimplifiableIfStatement 5803 ListenerInfo li = mListenerInfo; 5804 if (li != null && li.mOnHoverListener != null 5805 && (mViewFlags & ENABLED_MASK) == ENABLED 5806 && li.mOnHoverListener.onHover(this, event)) { 5807 return true; 5808 } 5809 5810 return onHoverEvent(event); 5811 } 5812 5813 /** 5814 * Returns true if the view has a child to which it has recently sent 5815 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 5816 * it does not have a hovered child, then it must be the innermost hovered view. 5817 * @hide 5818 */ 5819 protected boolean hasHoveredChild() { 5820 return false; 5821 } 5822 5823 /** 5824 * Dispatch a generic motion event to the view under the first pointer. 5825 * <p> 5826 * Do not call this method directly. 5827 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5828 * </p> 5829 * 5830 * @param event The motion event to be dispatched. 5831 * @return True if the event was handled by the view, false otherwise. 5832 */ 5833 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 5834 return false; 5835 } 5836 5837 /** 5838 * Dispatch a generic motion event to the currently focused view. 5839 * <p> 5840 * Do not call this method directly. 5841 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5842 * </p> 5843 * 5844 * @param event The motion event to be dispatched. 5845 * @return True if the event was handled by the view, false otherwise. 5846 */ 5847 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 5848 return false; 5849 } 5850 5851 /** 5852 * Dispatch a pointer event. 5853 * <p> 5854 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 5855 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 5856 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 5857 * and should not be expected to handle other pointing device features. 5858 * </p> 5859 * 5860 * @param event The motion event to be dispatched. 5861 * @return True if the event was handled by the view, false otherwise. 5862 * @hide 5863 */ 5864 public final boolean dispatchPointerEvent(MotionEvent event) { 5865 if (event.isTouchEvent()) { 5866 return dispatchTouchEvent(event); 5867 } else { 5868 return dispatchGenericMotionEvent(event); 5869 } 5870 } 5871 5872 /** 5873 * Called when the window containing this view gains or loses window focus. 5874 * ViewGroups should override to route to their children. 5875 * 5876 * @param hasFocus True if the window containing this view now has focus, 5877 * false otherwise. 5878 */ 5879 public void dispatchWindowFocusChanged(boolean hasFocus) { 5880 onWindowFocusChanged(hasFocus); 5881 } 5882 5883 /** 5884 * Called when the window containing this view gains or loses focus. Note 5885 * that this is separate from view focus: to receive key events, both 5886 * your view and its window must have focus. If a window is displayed 5887 * on top of yours that takes input focus, then your own window will lose 5888 * focus but the view focus will remain unchanged. 5889 * 5890 * @param hasWindowFocus True if the window containing this view now has 5891 * focus, false otherwise. 5892 */ 5893 public void onWindowFocusChanged(boolean hasWindowFocus) { 5894 InputMethodManager imm = InputMethodManager.peekInstance(); 5895 if (!hasWindowFocus) { 5896 if (isPressed()) { 5897 setPressed(false); 5898 } 5899 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5900 imm.focusOut(this); 5901 } 5902 removeLongPressCallback(); 5903 removeTapCallback(); 5904 onFocusLost(); 5905 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5906 imm.focusIn(this); 5907 } 5908 refreshDrawableState(); 5909 } 5910 5911 /** 5912 * Returns true if this view is in a window that currently has window focus. 5913 * Note that this is not the same as the view itself having focus. 5914 * 5915 * @return True if this view is in a window that currently has window focus. 5916 */ 5917 public boolean hasWindowFocus() { 5918 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 5919 } 5920 5921 /** 5922 * Dispatch a view visibility change down the view hierarchy. 5923 * ViewGroups should override to route to their children. 5924 * @param changedView The view whose visibility changed. Could be 'this' or 5925 * an ancestor view. 5926 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5927 * {@link #INVISIBLE} or {@link #GONE}. 5928 */ 5929 protected void dispatchVisibilityChanged(View changedView, int visibility) { 5930 onVisibilityChanged(changedView, visibility); 5931 } 5932 5933 /** 5934 * Called when the visibility of the view or an ancestor of the view is changed. 5935 * @param changedView The view whose visibility changed. Could be 'this' or 5936 * an ancestor view. 5937 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5938 * {@link #INVISIBLE} or {@link #GONE}. 5939 */ 5940 protected void onVisibilityChanged(View changedView, int visibility) { 5941 if (visibility == VISIBLE) { 5942 if (mAttachInfo != null) { 5943 initialAwakenScrollBars(); 5944 } else { 5945 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 5946 } 5947 } 5948 } 5949 5950 /** 5951 * Dispatch a hint about whether this view is displayed. For instance, when 5952 * a View moves out of the screen, it might receives a display hint indicating 5953 * the view is not displayed. Applications should not <em>rely</em> on this hint 5954 * as there is no guarantee that they will receive one. 5955 * 5956 * @param hint A hint about whether or not this view is displayed: 5957 * {@link #VISIBLE} or {@link #INVISIBLE}. 5958 */ 5959 public void dispatchDisplayHint(int hint) { 5960 onDisplayHint(hint); 5961 } 5962 5963 /** 5964 * Gives this view a hint about whether is displayed or not. For instance, when 5965 * a View moves out of the screen, it might receives a display hint indicating 5966 * the view is not displayed. Applications should not <em>rely</em> on this hint 5967 * as there is no guarantee that they will receive one. 5968 * 5969 * @param hint A hint about whether or not this view is displayed: 5970 * {@link #VISIBLE} or {@link #INVISIBLE}. 5971 */ 5972 protected void onDisplayHint(int hint) { 5973 } 5974 5975 /** 5976 * Dispatch a window visibility change down the view hierarchy. 5977 * ViewGroups should override to route to their children. 5978 * 5979 * @param visibility The new visibility of the window. 5980 * 5981 * @see #onWindowVisibilityChanged(int) 5982 */ 5983 public void dispatchWindowVisibilityChanged(int visibility) { 5984 onWindowVisibilityChanged(visibility); 5985 } 5986 5987 /** 5988 * Called when the window containing has change its visibility 5989 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 5990 * that this tells you whether or not your window is being made visible 5991 * to the window manager; this does <em>not</em> tell you whether or not 5992 * your window is obscured by other windows on the screen, even if it 5993 * is itself visible. 5994 * 5995 * @param visibility The new visibility of the window. 5996 */ 5997 protected void onWindowVisibilityChanged(int visibility) { 5998 if (visibility == VISIBLE) { 5999 initialAwakenScrollBars(); 6000 } 6001 } 6002 6003 /** 6004 * Returns the current visibility of the window this view is attached to 6005 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 6006 * 6007 * @return Returns the current visibility of the view's window. 6008 */ 6009 public int getWindowVisibility() { 6010 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 6011 } 6012 6013 /** 6014 * Retrieve the overall visible display size in which the window this view is 6015 * attached to has been positioned in. This takes into account screen 6016 * decorations above the window, for both cases where the window itself 6017 * is being position inside of them or the window is being placed under 6018 * then and covered insets are used for the window to position its content 6019 * inside. In effect, this tells you the available area where content can 6020 * be placed and remain visible to users. 6021 * 6022 * <p>This function requires an IPC back to the window manager to retrieve 6023 * the requested information, so should not be used in performance critical 6024 * code like drawing. 6025 * 6026 * @param outRect Filled in with the visible display frame. If the view 6027 * is not attached to a window, this is simply the raw display size. 6028 */ 6029 public void getWindowVisibleDisplayFrame(Rect outRect) { 6030 if (mAttachInfo != null) { 6031 try { 6032 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 6033 } catch (RemoteException e) { 6034 return; 6035 } 6036 // XXX This is really broken, and probably all needs to be done 6037 // in the window manager, and we need to know more about whether 6038 // we want the area behind or in front of the IME. 6039 final Rect insets = mAttachInfo.mVisibleInsets; 6040 outRect.left += insets.left; 6041 outRect.top += insets.top; 6042 outRect.right -= insets.right; 6043 outRect.bottom -= insets.bottom; 6044 return; 6045 } 6046 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 6047 d.getRectSize(outRect); 6048 } 6049 6050 /** 6051 * Dispatch a notification about a resource configuration change down 6052 * the view hierarchy. 6053 * ViewGroups should override to route to their children. 6054 * 6055 * @param newConfig The new resource configuration. 6056 * 6057 * @see #onConfigurationChanged(android.content.res.Configuration) 6058 */ 6059 public void dispatchConfigurationChanged(Configuration newConfig) { 6060 onConfigurationChanged(newConfig); 6061 } 6062 6063 /** 6064 * Called when the current configuration of the resources being used 6065 * by the application have changed. You can use this to decide when 6066 * to reload resources that can changed based on orientation and other 6067 * configuration characterstics. You only need to use this if you are 6068 * not relying on the normal {@link android.app.Activity} mechanism of 6069 * recreating the activity instance upon a configuration change. 6070 * 6071 * @param newConfig The new resource configuration. 6072 */ 6073 protected void onConfigurationChanged(Configuration newConfig) { 6074 } 6075 6076 /** 6077 * Private function to aggregate all per-view attributes in to the view 6078 * root. 6079 */ 6080 void dispatchCollectViewAttributes(int visibility) { 6081 performCollectViewAttributes(visibility); 6082 } 6083 6084 void performCollectViewAttributes(int visibility) { 6085 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 6086 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 6087 mAttachInfo.mKeepScreenOn = true; 6088 } 6089 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 6090 ListenerInfo li = mListenerInfo; 6091 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 6092 mAttachInfo.mHasSystemUiListeners = true; 6093 } 6094 } 6095 } 6096 6097 void needGlobalAttributesUpdate(boolean force) { 6098 final AttachInfo ai = mAttachInfo; 6099 if (ai != null) { 6100 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 6101 || ai.mHasSystemUiListeners) { 6102 ai.mRecomputeGlobalAttributes = true; 6103 } 6104 } 6105 } 6106 6107 /** 6108 * Returns whether the device is currently in touch mode. Touch mode is entered 6109 * once the user begins interacting with the device by touch, and affects various 6110 * things like whether focus is always visible to the user. 6111 * 6112 * @return Whether the device is in touch mode. 6113 */ 6114 @ViewDebug.ExportedProperty 6115 public boolean isInTouchMode() { 6116 if (mAttachInfo != null) { 6117 return mAttachInfo.mInTouchMode; 6118 } else { 6119 return ViewRootImpl.isInTouchMode(); 6120 } 6121 } 6122 6123 /** 6124 * Returns the context the view is running in, through which it can 6125 * access the current theme, resources, etc. 6126 * 6127 * @return The view's Context. 6128 */ 6129 @ViewDebug.CapturedViewProperty 6130 public final Context getContext() { 6131 return mContext; 6132 } 6133 6134 /** 6135 * Handle a key event before it is processed by any input method 6136 * associated with the view hierarchy. This can be used to intercept 6137 * key events in special situations before the IME consumes them; a 6138 * typical example would be handling the BACK key to update the application's 6139 * UI instead of allowing the IME to see it and close itself. 6140 * 6141 * @param keyCode The value in event.getKeyCode(). 6142 * @param event Description of the key event. 6143 * @return If you handled the event, return true. If you want to allow the 6144 * event to be handled by the next receiver, return false. 6145 */ 6146 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 6147 return false; 6148 } 6149 6150 /** 6151 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 6152 * KeyEvent.Callback.onKeyDown()}: perform press of the view 6153 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 6154 * is released, if the view is enabled and clickable. 6155 * 6156 * @param keyCode A key code that represents the button pressed, from 6157 * {@link android.view.KeyEvent}. 6158 * @param event The KeyEvent object that defines the button action. 6159 */ 6160 public boolean onKeyDown(int keyCode, KeyEvent event) { 6161 boolean result = false; 6162 6163 switch (keyCode) { 6164 case KeyEvent.KEYCODE_DPAD_CENTER: 6165 case KeyEvent.KEYCODE_ENTER: { 6166 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 6167 return true; 6168 } 6169 // Long clickable items don't necessarily have to be clickable 6170 if (((mViewFlags & CLICKABLE) == CLICKABLE || 6171 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 6172 (event.getRepeatCount() == 0)) { 6173 setPressed(true); 6174 checkForLongClick(0); 6175 return true; 6176 } 6177 break; 6178 } 6179 } 6180 return result; 6181 } 6182 6183 /** 6184 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 6185 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 6186 * the event). 6187 */ 6188 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 6189 return false; 6190 } 6191 6192 /** 6193 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 6194 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 6195 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 6196 * {@link KeyEvent#KEYCODE_ENTER} is released. 6197 * 6198 * @param keyCode A key code that represents the button pressed, from 6199 * {@link android.view.KeyEvent}. 6200 * @param event The KeyEvent object that defines the button action. 6201 */ 6202 public boolean onKeyUp(int keyCode, KeyEvent event) { 6203 boolean result = false; 6204 6205 switch (keyCode) { 6206 case KeyEvent.KEYCODE_DPAD_CENTER: 6207 case KeyEvent.KEYCODE_ENTER: { 6208 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 6209 return true; 6210 } 6211 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 6212 setPressed(false); 6213 6214 if (!mHasPerformedLongPress) { 6215 // This is a tap, so remove the longpress check 6216 removeLongPressCallback(); 6217 6218 result = performClick(); 6219 } 6220 } 6221 break; 6222 } 6223 } 6224 return result; 6225 } 6226 6227 /** 6228 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 6229 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 6230 * the event). 6231 * 6232 * @param keyCode A key code that represents the button pressed, from 6233 * {@link android.view.KeyEvent}. 6234 * @param repeatCount The number of times the action was made. 6235 * @param event The KeyEvent object that defines the button action. 6236 */ 6237 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 6238 return false; 6239 } 6240 6241 /** 6242 * Called on the focused view when a key shortcut event is not handled. 6243 * Override this method to implement local key shortcuts for the View. 6244 * Key shortcuts can also be implemented by setting the 6245 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 6246 * 6247 * @param keyCode The value in event.getKeyCode(). 6248 * @param event Description of the key event. 6249 * @return If you handled the event, return true. If you want to allow the 6250 * event to be handled by the next receiver, return false. 6251 */ 6252 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 6253 return false; 6254 } 6255 6256 /** 6257 * Check whether the called view is a text editor, in which case it 6258 * would make sense to automatically display a soft input window for 6259 * it. Subclasses should override this if they implement 6260 * {@link #onCreateInputConnection(EditorInfo)} to return true if 6261 * a call on that method would return a non-null InputConnection, and 6262 * they are really a first-class editor that the user would normally 6263 * start typing on when the go into a window containing your view. 6264 * 6265 * <p>The default implementation always returns false. This does 6266 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 6267 * will not be called or the user can not otherwise perform edits on your 6268 * view; it is just a hint to the system that this is not the primary 6269 * purpose of this view. 6270 * 6271 * @return Returns true if this view is a text editor, else false. 6272 */ 6273 public boolean onCheckIsTextEditor() { 6274 return false; 6275 } 6276 6277 /** 6278 * Create a new InputConnection for an InputMethod to interact 6279 * with the view. The default implementation returns null, since it doesn't 6280 * support input methods. You can override this to implement such support. 6281 * This is only needed for views that take focus and text input. 6282 * 6283 * <p>When implementing this, you probably also want to implement 6284 * {@link #onCheckIsTextEditor()} to indicate you will return a 6285 * non-null InputConnection. 6286 * 6287 * @param outAttrs Fill in with attribute information about the connection. 6288 */ 6289 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 6290 return null; 6291 } 6292 6293 /** 6294 * Called by the {@link android.view.inputmethod.InputMethodManager} 6295 * when a view who is not the current 6296 * input connection target is trying to make a call on the manager. The 6297 * default implementation returns false; you can override this to return 6298 * true for certain views if you are performing InputConnection proxying 6299 * to them. 6300 * @param view The View that is making the InputMethodManager call. 6301 * @return Return true to allow the call, false to reject. 6302 */ 6303 public boolean checkInputConnectionProxy(View view) { 6304 return false; 6305 } 6306 6307 /** 6308 * Show the context menu for this view. It is not safe to hold on to the 6309 * menu after returning from this method. 6310 * 6311 * You should normally not overload this method. Overload 6312 * {@link #onCreateContextMenu(ContextMenu)} or define an 6313 * {@link OnCreateContextMenuListener} to add items to the context menu. 6314 * 6315 * @param menu The context menu to populate 6316 */ 6317 public void createContextMenu(ContextMenu menu) { 6318 ContextMenuInfo menuInfo = getContextMenuInfo(); 6319 6320 // Sets the current menu info so all items added to menu will have 6321 // my extra info set. 6322 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 6323 6324 onCreateContextMenu(menu); 6325 ListenerInfo li = mListenerInfo; 6326 if (li != null && li.mOnCreateContextMenuListener != null) { 6327 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 6328 } 6329 6330 // Clear the extra information so subsequent items that aren't mine don't 6331 // have my extra info. 6332 ((MenuBuilder)menu).setCurrentMenuInfo(null); 6333 6334 if (mParent != null) { 6335 mParent.createContextMenu(menu); 6336 } 6337 } 6338 6339 /** 6340 * Views should implement this if they have extra information to associate 6341 * with the context menu. The return result is supplied as a parameter to 6342 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 6343 * callback. 6344 * 6345 * @return Extra information about the item for which the context menu 6346 * should be shown. This information will vary across different 6347 * subclasses of View. 6348 */ 6349 protected ContextMenuInfo getContextMenuInfo() { 6350 return null; 6351 } 6352 6353 /** 6354 * Views should implement this if the view itself is going to add items to 6355 * the context menu. 6356 * 6357 * @param menu the context menu to populate 6358 */ 6359 protected void onCreateContextMenu(ContextMenu menu) { 6360 } 6361 6362 /** 6363 * Implement this method to handle trackball motion events. The 6364 * <em>relative</em> movement of the trackball since the last event 6365 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 6366 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 6367 * that a movement of 1 corresponds to the user pressing one DPAD key (so 6368 * they will often be fractional values, representing the more fine-grained 6369 * movement information available from a trackball). 6370 * 6371 * @param event The motion event. 6372 * @return True if the event was handled, false otherwise. 6373 */ 6374 public boolean onTrackballEvent(MotionEvent event) { 6375 return false; 6376 } 6377 6378 /** 6379 * Implement this method to handle generic motion events. 6380 * <p> 6381 * Generic motion events describe joystick movements, mouse hovers, track pad 6382 * touches, scroll wheel movements and other input events. The 6383 * {@link MotionEvent#getSource() source} of the motion event specifies 6384 * the class of input that was received. Implementations of this method 6385 * must examine the bits in the source before processing the event. 6386 * The following code example shows how this is done. 6387 * </p><p> 6388 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6389 * are delivered to the view under the pointer. All other generic motion events are 6390 * delivered to the focused view. 6391 * </p> 6392 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 6393 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 6394 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 6395 * // process the joystick movement... 6396 * return true; 6397 * } 6398 * } 6399 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6400 * switch (event.getAction()) { 6401 * case MotionEvent.ACTION_HOVER_MOVE: 6402 * // process the mouse hover movement... 6403 * return true; 6404 * case MotionEvent.ACTION_SCROLL: 6405 * // process the scroll wheel movement... 6406 * return true; 6407 * } 6408 * } 6409 * return super.onGenericMotionEvent(event); 6410 * }</pre> 6411 * 6412 * @param event The generic motion event being processed. 6413 * @return True if the event was handled, false otherwise. 6414 */ 6415 public boolean onGenericMotionEvent(MotionEvent event) { 6416 return false; 6417 } 6418 6419 /** 6420 * Implement this method to handle hover events. 6421 * <p> 6422 * This method is called whenever a pointer is hovering into, over, or out of the 6423 * bounds of a view and the view is not currently being touched. 6424 * Hover events are represented as pointer events with action 6425 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 6426 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 6427 * </p> 6428 * <ul> 6429 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 6430 * when the pointer enters the bounds of the view.</li> 6431 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 6432 * when the pointer has already entered the bounds of the view and has moved.</li> 6433 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 6434 * when the pointer has exited the bounds of the view or when the pointer is 6435 * about to go down due to a button click, tap, or similar user action that 6436 * causes the view to be touched.</li> 6437 * </ul> 6438 * <p> 6439 * The view should implement this method to return true to indicate that it is 6440 * handling the hover event, such as by changing its drawable state. 6441 * </p><p> 6442 * The default implementation calls {@link #setHovered} to update the hovered state 6443 * of the view when a hover enter or hover exit event is received, if the view 6444 * is enabled and is clickable. The default implementation also sends hover 6445 * accessibility events. 6446 * </p> 6447 * 6448 * @param event The motion event that describes the hover. 6449 * @return True if the view handled the hover event. 6450 * 6451 * @see #isHovered 6452 * @see #setHovered 6453 * @see #onHoverChanged 6454 */ 6455 public boolean onHoverEvent(MotionEvent event) { 6456 // The root view may receive hover (or touch) events that are outside the bounds of 6457 // the window. This code ensures that we only send accessibility events for 6458 // hovers that are actually within the bounds of the root view. 6459 final int action = event.getAction(); 6460 if (!mSendingHoverAccessibilityEvents) { 6461 if ((action == MotionEvent.ACTION_HOVER_ENTER 6462 || action == MotionEvent.ACTION_HOVER_MOVE) 6463 && !hasHoveredChild() 6464 && pointInView(event.getX(), event.getY())) { 6465 mSendingHoverAccessibilityEvents = true; 6466 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 6467 } 6468 } else { 6469 if (action == MotionEvent.ACTION_HOVER_EXIT 6470 || (action == MotionEvent.ACTION_HOVER_MOVE 6471 && !pointInView(event.getX(), event.getY()))) { 6472 mSendingHoverAccessibilityEvents = false; 6473 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 6474 } 6475 } 6476 6477 if (isHoverable()) { 6478 switch (action) { 6479 case MotionEvent.ACTION_HOVER_ENTER: 6480 setHovered(true); 6481 break; 6482 case MotionEvent.ACTION_HOVER_EXIT: 6483 setHovered(false); 6484 break; 6485 } 6486 6487 // Dispatch the event to onGenericMotionEvent before returning true. 6488 // This is to provide compatibility with existing applications that 6489 // handled HOVER_MOVE events in onGenericMotionEvent and that would 6490 // break because of the new default handling for hoverable views 6491 // in onHoverEvent. 6492 // Note that onGenericMotionEvent will be called by default when 6493 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 6494 dispatchGenericMotionEventInternal(event); 6495 return true; 6496 } 6497 return false; 6498 } 6499 6500 /** 6501 * Returns true if the view should handle {@link #onHoverEvent} 6502 * by calling {@link #setHovered} to change its hovered state. 6503 * 6504 * @return True if the view is hoverable. 6505 */ 6506 private boolean isHoverable() { 6507 final int viewFlags = mViewFlags; 6508 //noinspection SimplifiableIfStatement 6509 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6510 return false; 6511 } 6512 6513 return (viewFlags & CLICKABLE) == CLICKABLE 6514 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6515 } 6516 6517 /** 6518 * Returns true if the view is currently hovered. 6519 * 6520 * @return True if the view is currently hovered. 6521 * 6522 * @see #setHovered 6523 * @see #onHoverChanged 6524 */ 6525 @ViewDebug.ExportedProperty 6526 public boolean isHovered() { 6527 return (mPrivateFlags & HOVERED) != 0; 6528 } 6529 6530 /** 6531 * Sets whether the view is currently hovered. 6532 * <p> 6533 * Calling this method also changes the drawable state of the view. This 6534 * enables the view to react to hover by using different drawable resources 6535 * to change its appearance. 6536 * </p><p> 6537 * The {@link #onHoverChanged} method is called when the hovered state changes. 6538 * </p> 6539 * 6540 * @param hovered True if the view is hovered. 6541 * 6542 * @see #isHovered 6543 * @see #onHoverChanged 6544 */ 6545 public void setHovered(boolean hovered) { 6546 if (hovered) { 6547 if ((mPrivateFlags & HOVERED) == 0) { 6548 mPrivateFlags |= HOVERED; 6549 refreshDrawableState(); 6550 onHoverChanged(true); 6551 } 6552 } else { 6553 if ((mPrivateFlags & HOVERED) != 0) { 6554 mPrivateFlags &= ~HOVERED; 6555 refreshDrawableState(); 6556 onHoverChanged(false); 6557 } 6558 } 6559 } 6560 6561 /** 6562 * Implement this method to handle hover state changes. 6563 * <p> 6564 * This method is called whenever the hover state changes as a result of a 6565 * call to {@link #setHovered}. 6566 * </p> 6567 * 6568 * @param hovered The current hover state, as returned by {@link #isHovered}. 6569 * 6570 * @see #isHovered 6571 * @see #setHovered 6572 */ 6573 public void onHoverChanged(boolean hovered) { 6574 } 6575 6576 /** 6577 * Implement this method to handle touch screen motion events. 6578 * 6579 * @param event The motion event. 6580 * @return True if the event was handled, false otherwise. 6581 */ 6582 public boolean onTouchEvent(MotionEvent event) { 6583 final int viewFlags = mViewFlags; 6584 6585 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6586 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 6587 setPressed(false); 6588 } 6589 // A disabled view that is clickable still consumes the touch 6590 // events, it just doesn't respond to them. 6591 return (((viewFlags & CLICKABLE) == CLICKABLE || 6592 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 6593 } 6594 6595 if (mTouchDelegate != null) { 6596 if (mTouchDelegate.onTouchEvent(event)) { 6597 return true; 6598 } 6599 } 6600 6601 if (((viewFlags & CLICKABLE) == CLICKABLE || 6602 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 6603 switch (event.getAction()) { 6604 case MotionEvent.ACTION_UP: 6605 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 6606 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 6607 // take focus if we don't have it already and we should in 6608 // touch mode. 6609 boolean focusTaken = false; 6610 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 6611 focusTaken = requestFocus(); 6612 } 6613 6614 if (prepressed) { 6615 // The button is being released before we actually 6616 // showed it as pressed. Make it show the pressed 6617 // state now (before scheduling the click) to ensure 6618 // the user sees it. 6619 setPressed(true); 6620 } 6621 6622 if (!mHasPerformedLongPress) { 6623 // This is a tap, so remove the longpress check 6624 removeLongPressCallback(); 6625 6626 // Only perform take click actions if we were in the pressed state 6627 if (!focusTaken) { 6628 // Use a Runnable and post this rather than calling 6629 // performClick directly. This lets other visual state 6630 // of the view update before click actions start. 6631 if (mPerformClick == null) { 6632 mPerformClick = new PerformClick(); 6633 } 6634 if (!post(mPerformClick)) { 6635 performClick(); 6636 } 6637 } 6638 } 6639 6640 if (mUnsetPressedState == null) { 6641 mUnsetPressedState = new UnsetPressedState(); 6642 } 6643 6644 if (prepressed) { 6645 postDelayed(mUnsetPressedState, 6646 ViewConfiguration.getPressedStateDuration()); 6647 } else if (!post(mUnsetPressedState)) { 6648 // If the post failed, unpress right now 6649 mUnsetPressedState.run(); 6650 } 6651 removeTapCallback(); 6652 } 6653 break; 6654 6655 case MotionEvent.ACTION_DOWN: 6656 mHasPerformedLongPress = false; 6657 6658 if (performButtonActionOnTouchDown(event)) { 6659 break; 6660 } 6661 6662 // Walk up the hierarchy to determine if we're inside a scrolling container. 6663 boolean isInScrollingContainer = isInScrollingContainer(); 6664 6665 // For views inside a scrolling container, delay the pressed feedback for 6666 // a short period in case this is a scroll. 6667 if (isInScrollingContainer) { 6668 mPrivateFlags |= PREPRESSED; 6669 if (mPendingCheckForTap == null) { 6670 mPendingCheckForTap = new CheckForTap(); 6671 } 6672 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 6673 } else { 6674 // Not inside a scrolling container, so show the feedback right away 6675 setPressed(true); 6676 checkForLongClick(0); 6677 } 6678 break; 6679 6680 case MotionEvent.ACTION_CANCEL: 6681 setPressed(false); 6682 removeTapCallback(); 6683 break; 6684 6685 case MotionEvent.ACTION_MOVE: 6686 final int x = (int) event.getX(); 6687 final int y = (int) event.getY(); 6688 6689 // Be lenient about moving outside of buttons 6690 if (!pointInView(x, y, mTouchSlop)) { 6691 // Outside button 6692 removeTapCallback(); 6693 if ((mPrivateFlags & PRESSED) != 0) { 6694 // Remove any future long press/tap checks 6695 removeLongPressCallback(); 6696 6697 setPressed(false); 6698 } 6699 } 6700 break; 6701 } 6702 return true; 6703 } 6704 6705 return false; 6706 } 6707 6708 /** 6709 * @hide 6710 */ 6711 public boolean isInScrollingContainer() { 6712 ViewParent p = getParent(); 6713 while (p != null && p instanceof ViewGroup) { 6714 if (((ViewGroup) p).shouldDelayChildPressedState()) { 6715 return true; 6716 } 6717 p = p.getParent(); 6718 } 6719 return false; 6720 } 6721 6722 /** 6723 * Remove the longpress detection timer. 6724 */ 6725 private void removeLongPressCallback() { 6726 if (mPendingCheckForLongPress != null) { 6727 removeCallbacks(mPendingCheckForLongPress); 6728 } 6729 } 6730 6731 /** 6732 * Remove the pending click action 6733 */ 6734 private void removePerformClickCallback() { 6735 if (mPerformClick != null) { 6736 removeCallbacks(mPerformClick); 6737 } 6738 } 6739 6740 /** 6741 * Remove the prepress detection timer. 6742 */ 6743 private void removeUnsetPressCallback() { 6744 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 6745 setPressed(false); 6746 removeCallbacks(mUnsetPressedState); 6747 } 6748 } 6749 6750 /** 6751 * Remove the tap detection timer. 6752 */ 6753 private void removeTapCallback() { 6754 if (mPendingCheckForTap != null) { 6755 mPrivateFlags &= ~PREPRESSED; 6756 removeCallbacks(mPendingCheckForTap); 6757 } 6758 } 6759 6760 /** 6761 * Cancels a pending long press. Your subclass can use this if you 6762 * want the context menu to come up if the user presses and holds 6763 * at the same place, but you don't want it to come up if they press 6764 * and then move around enough to cause scrolling. 6765 */ 6766 public void cancelLongPress() { 6767 removeLongPressCallback(); 6768 6769 /* 6770 * The prepressed state handled by the tap callback is a display 6771 * construct, but the tap callback will post a long press callback 6772 * less its own timeout. Remove it here. 6773 */ 6774 removeTapCallback(); 6775 } 6776 6777 /** 6778 * Remove the pending callback for sending a 6779 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 6780 */ 6781 private void removeSendViewScrolledAccessibilityEventCallback() { 6782 if (mSendViewScrolledAccessibilityEvent != null) { 6783 removeCallbacks(mSendViewScrolledAccessibilityEvent); 6784 } 6785 } 6786 6787 /** 6788 * Sets the TouchDelegate for this View. 6789 */ 6790 public void setTouchDelegate(TouchDelegate delegate) { 6791 mTouchDelegate = delegate; 6792 } 6793 6794 /** 6795 * Gets the TouchDelegate for this View. 6796 */ 6797 public TouchDelegate getTouchDelegate() { 6798 return mTouchDelegate; 6799 } 6800 6801 /** 6802 * Set flags controlling behavior of this view. 6803 * 6804 * @param flags Constant indicating the value which should be set 6805 * @param mask Constant indicating the bit range that should be changed 6806 */ 6807 void setFlags(int flags, int mask) { 6808 int old = mViewFlags; 6809 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 6810 6811 int changed = mViewFlags ^ old; 6812 if (changed == 0) { 6813 return; 6814 } 6815 int privateFlags = mPrivateFlags; 6816 6817 /* Check if the FOCUSABLE bit has changed */ 6818 if (((changed & FOCUSABLE_MASK) != 0) && 6819 ((privateFlags & HAS_BOUNDS) !=0)) { 6820 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 6821 && ((privateFlags & FOCUSED) != 0)) { 6822 /* Give up focus if we are no longer focusable */ 6823 clearFocus(); 6824 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 6825 && ((privateFlags & FOCUSED) == 0)) { 6826 /* 6827 * Tell the view system that we are now available to take focus 6828 * if no one else already has it. 6829 */ 6830 if (mParent != null) mParent.focusableViewAvailable(this); 6831 } 6832 } 6833 6834 if ((flags & VISIBILITY_MASK) == VISIBLE) { 6835 if ((changed & VISIBILITY_MASK) != 0) { 6836 /* 6837 * If this view is becoming visible, invalidate it in case it changed while 6838 * it was not visible. Marking it drawn ensures that the invalidation will 6839 * go through. 6840 */ 6841 mPrivateFlags |= DRAWN; 6842 invalidate(true); 6843 6844 needGlobalAttributesUpdate(true); 6845 6846 // a view becoming visible is worth notifying the parent 6847 // about in case nothing has focus. even if this specific view 6848 // isn't focusable, it may contain something that is, so let 6849 // the root view try to give this focus if nothing else does. 6850 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 6851 mParent.focusableViewAvailable(this); 6852 } 6853 } 6854 } 6855 6856 /* Check if the GONE bit has changed */ 6857 if ((changed & GONE) != 0) { 6858 needGlobalAttributesUpdate(false); 6859 requestLayout(); 6860 6861 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 6862 if (hasFocus()) clearFocus(); 6863 destroyDrawingCache(); 6864 if (mParent instanceof View) { 6865 // GONE views noop invalidation, so invalidate the parent 6866 ((View) mParent).invalidate(true); 6867 } 6868 // Mark the view drawn to ensure that it gets invalidated properly the next 6869 // time it is visible and gets invalidated 6870 mPrivateFlags |= DRAWN; 6871 } 6872 if (mAttachInfo != null) { 6873 mAttachInfo.mViewVisibilityChanged = true; 6874 } 6875 } 6876 6877 /* Check if the VISIBLE bit has changed */ 6878 if ((changed & INVISIBLE) != 0) { 6879 needGlobalAttributesUpdate(false); 6880 /* 6881 * If this view is becoming invisible, set the DRAWN flag so that 6882 * the next invalidate() will not be skipped. 6883 */ 6884 mPrivateFlags |= DRAWN; 6885 6886 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 6887 // root view becoming invisible shouldn't clear focus 6888 if (getRootView() != this) { 6889 clearFocus(); 6890 } 6891 } 6892 if (mAttachInfo != null) { 6893 mAttachInfo.mViewVisibilityChanged = true; 6894 } 6895 } 6896 6897 if ((changed & VISIBILITY_MASK) != 0) { 6898 if (mParent instanceof ViewGroup) { 6899 ((ViewGroup) mParent).onChildVisibilityChanged(this, 6900 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 6901 ((View) mParent).invalidate(true); 6902 } else if (mParent != null) { 6903 mParent.invalidateChild(this, null); 6904 } 6905 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6906 } 6907 6908 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 6909 destroyDrawingCache(); 6910 } 6911 6912 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 6913 destroyDrawingCache(); 6914 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6915 invalidateParentCaches(); 6916 } 6917 6918 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 6919 destroyDrawingCache(); 6920 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6921 } 6922 6923 if ((changed & DRAW_MASK) != 0) { 6924 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 6925 if (mBGDrawable != null) { 6926 mPrivateFlags &= ~SKIP_DRAW; 6927 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 6928 } else { 6929 mPrivateFlags |= SKIP_DRAW; 6930 } 6931 } else { 6932 mPrivateFlags &= ~SKIP_DRAW; 6933 } 6934 requestLayout(); 6935 invalidate(true); 6936 } 6937 6938 if ((changed & KEEP_SCREEN_ON) != 0) { 6939 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 6940 mParent.recomputeViewAttributes(this); 6941 } 6942 } 6943 6944 if ((changed & LAYOUT_DIRECTION_MASK) != 0) { 6945 requestLayout(); 6946 } 6947 } 6948 6949 /** 6950 * Change the view's z order in the tree, so it's on top of other sibling 6951 * views 6952 */ 6953 public void bringToFront() { 6954 if (mParent != null) { 6955 mParent.bringChildToFront(this); 6956 } 6957 } 6958 6959 /** 6960 * This is called in response to an internal scroll in this view (i.e., the 6961 * view scrolled its own contents). This is typically as a result of 6962 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 6963 * called. 6964 * 6965 * @param l Current horizontal scroll origin. 6966 * @param t Current vertical scroll origin. 6967 * @param oldl Previous horizontal scroll origin. 6968 * @param oldt Previous vertical scroll origin. 6969 */ 6970 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 6971 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 6972 postSendViewScrolledAccessibilityEventCallback(); 6973 } 6974 6975 mBackgroundSizeChanged = true; 6976 6977 final AttachInfo ai = mAttachInfo; 6978 if (ai != null) { 6979 ai.mViewScrollChanged = true; 6980 } 6981 } 6982 6983 /** 6984 * Interface definition for a callback to be invoked when the layout bounds of a view 6985 * changes due to layout processing. 6986 */ 6987 public interface OnLayoutChangeListener { 6988 /** 6989 * Called when the focus state of a view has changed. 6990 * 6991 * @param v The view whose state has changed. 6992 * @param left The new value of the view's left property. 6993 * @param top The new value of the view's top property. 6994 * @param right The new value of the view's right property. 6995 * @param bottom The new value of the view's bottom property. 6996 * @param oldLeft The previous value of the view's left property. 6997 * @param oldTop The previous value of the view's top property. 6998 * @param oldRight The previous value of the view's right property. 6999 * @param oldBottom The previous value of the view's bottom property. 7000 */ 7001 void onLayoutChange(View v, int left, int top, int right, int bottom, 7002 int oldLeft, int oldTop, int oldRight, int oldBottom); 7003 } 7004 7005 /** 7006 * This is called during layout when the size of this view has changed. If 7007 * you were just added to the view hierarchy, you're called with the old 7008 * values of 0. 7009 * 7010 * @param w Current width of this view. 7011 * @param h Current height of this view. 7012 * @param oldw Old width of this view. 7013 * @param oldh Old height of this view. 7014 */ 7015 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 7016 } 7017 7018 /** 7019 * Called by draw to draw the child views. This may be overridden 7020 * by derived classes to gain control just before its children are drawn 7021 * (but after its own view has been drawn). 7022 * @param canvas the canvas on which to draw the view 7023 */ 7024 protected void dispatchDraw(Canvas canvas) { 7025 } 7026 7027 /** 7028 * Gets the parent of this view. Note that the parent is a 7029 * ViewParent and not necessarily a View. 7030 * 7031 * @return Parent of this view. 7032 */ 7033 public final ViewParent getParent() { 7034 return mParent; 7035 } 7036 7037 /** 7038 * Set the horizontal scrolled position of your view. This will cause a call to 7039 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7040 * invalidated. 7041 * @param value the x position to scroll to 7042 */ 7043 public void setScrollX(int value) { 7044 scrollTo(value, mScrollY); 7045 } 7046 7047 /** 7048 * Set the vertical scrolled position of your view. This will cause a call to 7049 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7050 * invalidated. 7051 * @param value the y position to scroll to 7052 */ 7053 public void setScrollY(int value) { 7054 scrollTo(mScrollX, value); 7055 } 7056 7057 /** 7058 * Return the scrolled left position of this view. This is the left edge of 7059 * the displayed part of your view. You do not need to draw any pixels 7060 * farther left, since those are outside of the frame of your view on 7061 * screen. 7062 * 7063 * @return The left edge of the displayed part of your view, in pixels. 7064 */ 7065 public final int getScrollX() { 7066 return mScrollX; 7067 } 7068 7069 /** 7070 * Return the scrolled top position of this view. This is the top edge of 7071 * the displayed part of your view. You do not need to draw any pixels above 7072 * it, since those are outside of the frame of your view on screen. 7073 * 7074 * @return The top edge of the displayed part of your view, in pixels. 7075 */ 7076 public final int getScrollY() { 7077 return mScrollY; 7078 } 7079 7080 /** 7081 * Return the width of the your view. 7082 * 7083 * @return The width of your view, in pixels. 7084 */ 7085 @ViewDebug.ExportedProperty(category = "layout") 7086 public final int getWidth() { 7087 return mRight - mLeft; 7088 } 7089 7090 /** 7091 * Return the height of your view. 7092 * 7093 * @return The height of your view, in pixels. 7094 */ 7095 @ViewDebug.ExportedProperty(category = "layout") 7096 public final int getHeight() { 7097 return mBottom - mTop; 7098 } 7099 7100 /** 7101 * Return the visible drawing bounds of your view. Fills in the output 7102 * rectangle with the values from getScrollX(), getScrollY(), 7103 * getWidth(), and getHeight(). 7104 * 7105 * @param outRect The (scrolled) drawing bounds of the view. 7106 */ 7107 public void getDrawingRect(Rect outRect) { 7108 outRect.left = mScrollX; 7109 outRect.top = mScrollY; 7110 outRect.right = mScrollX + (mRight - mLeft); 7111 outRect.bottom = mScrollY + (mBottom - mTop); 7112 } 7113 7114 /** 7115 * Like {@link #getMeasuredWidthAndState()}, but only returns the 7116 * raw width component (that is the result is masked by 7117 * {@link #MEASURED_SIZE_MASK}). 7118 * 7119 * @return The raw measured width of this view. 7120 */ 7121 public final int getMeasuredWidth() { 7122 return mMeasuredWidth & MEASURED_SIZE_MASK; 7123 } 7124 7125 /** 7126 * Return the full width measurement information for this view as computed 7127 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 7128 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 7129 * This should be used during measurement and layout calculations only. Use 7130 * {@link #getWidth()} to see how wide a view is after layout. 7131 * 7132 * @return The measured width of this view as a bit mask. 7133 */ 7134 public final int getMeasuredWidthAndState() { 7135 return mMeasuredWidth; 7136 } 7137 7138 /** 7139 * Like {@link #getMeasuredHeightAndState()}, but only returns the 7140 * raw width component (that is the result is masked by 7141 * {@link #MEASURED_SIZE_MASK}). 7142 * 7143 * @return The raw measured height of this view. 7144 */ 7145 public final int getMeasuredHeight() { 7146 return mMeasuredHeight & MEASURED_SIZE_MASK; 7147 } 7148 7149 /** 7150 * Return the full height measurement information for this view as computed 7151 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 7152 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 7153 * This should be used during measurement and layout calculations only. Use 7154 * {@link #getHeight()} to see how wide a view is after layout. 7155 * 7156 * @return The measured width of this view as a bit mask. 7157 */ 7158 public final int getMeasuredHeightAndState() { 7159 return mMeasuredHeight; 7160 } 7161 7162 /** 7163 * Return only the state bits of {@link #getMeasuredWidthAndState()} 7164 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 7165 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 7166 * and the height component is at the shifted bits 7167 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 7168 */ 7169 public final int getMeasuredState() { 7170 return (mMeasuredWidth&MEASURED_STATE_MASK) 7171 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 7172 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 7173 } 7174 7175 /** 7176 * The transform matrix of this view, which is calculated based on the current 7177 * roation, scale, and pivot properties. 7178 * 7179 * @see #getRotation() 7180 * @see #getScaleX() 7181 * @see #getScaleY() 7182 * @see #getPivotX() 7183 * @see #getPivotY() 7184 * @return The current transform matrix for the view 7185 */ 7186 public Matrix getMatrix() { 7187 if (mTransformationInfo != null) { 7188 updateMatrix(); 7189 return mTransformationInfo.mMatrix; 7190 } 7191 return Matrix.IDENTITY_MATRIX; 7192 } 7193 7194 /** 7195 * Utility function to determine if the value is far enough away from zero to be 7196 * considered non-zero. 7197 * @param value A floating point value to check for zero-ness 7198 * @return whether the passed-in value is far enough away from zero to be considered non-zero 7199 */ 7200 private static boolean nonzero(float value) { 7201 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 7202 } 7203 7204 /** 7205 * Returns true if the transform matrix is the identity matrix. 7206 * Recomputes the matrix if necessary. 7207 * 7208 * @return True if the transform matrix is the identity matrix, false otherwise. 7209 */ 7210 final boolean hasIdentityMatrix() { 7211 if (mTransformationInfo != null) { 7212 updateMatrix(); 7213 return mTransformationInfo.mMatrixIsIdentity; 7214 } 7215 return true; 7216 } 7217 7218 void ensureTransformationInfo() { 7219 if (mTransformationInfo == null) { 7220 mTransformationInfo = new TransformationInfo(); 7221 } 7222 } 7223 7224 /** 7225 * Recomputes the transform matrix if necessary. 7226 */ 7227 private void updateMatrix() { 7228 final TransformationInfo info = mTransformationInfo; 7229 if (info == null) { 7230 return; 7231 } 7232 if (info.mMatrixDirty) { 7233 // transform-related properties have changed since the last time someone 7234 // asked for the matrix; recalculate it with the current values 7235 7236 // Figure out if we need to update the pivot point 7237 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7238 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 7239 info.mPrevWidth = mRight - mLeft; 7240 info.mPrevHeight = mBottom - mTop; 7241 info.mPivotX = info.mPrevWidth / 2f; 7242 info.mPivotY = info.mPrevHeight / 2f; 7243 } 7244 } 7245 info.mMatrix.reset(); 7246 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 7247 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 7248 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 7249 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 7250 } else { 7251 if (info.mCamera == null) { 7252 info.mCamera = new Camera(); 7253 info.matrix3D = new Matrix(); 7254 } 7255 info.mCamera.save(); 7256 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 7257 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 7258 info.mCamera.getMatrix(info.matrix3D); 7259 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 7260 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 7261 info.mPivotY + info.mTranslationY); 7262 info.mMatrix.postConcat(info.matrix3D); 7263 info.mCamera.restore(); 7264 } 7265 info.mMatrixDirty = false; 7266 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 7267 info.mInverseMatrixDirty = true; 7268 } 7269 } 7270 7271 /** 7272 * Utility method to retrieve the inverse of the current mMatrix property. 7273 * We cache the matrix to avoid recalculating it when transform properties 7274 * have not changed. 7275 * 7276 * @return The inverse of the current matrix of this view. 7277 */ 7278 final Matrix getInverseMatrix() { 7279 final TransformationInfo info = mTransformationInfo; 7280 if (info != null) { 7281 updateMatrix(); 7282 if (info.mInverseMatrixDirty) { 7283 if (info.mInverseMatrix == null) { 7284 info.mInverseMatrix = new Matrix(); 7285 } 7286 info.mMatrix.invert(info.mInverseMatrix); 7287 info.mInverseMatrixDirty = false; 7288 } 7289 return info.mInverseMatrix; 7290 } 7291 return Matrix.IDENTITY_MATRIX; 7292 } 7293 7294 /** 7295 * Gets the distance along the Z axis from the camera to this view. 7296 * 7297 * @see #setCameraDistance(float) 7298 * 7299 * @return The distance along the Z axis. 7300 */ 7301 public float getCameraDistance() { 7302 ensureTransformationInfo(); 7303 final float dpi = mResources.getDisplayMetrics().densityDpi; 7304 final TransformationInfo info = mTransformationInfo; 7305 if (info.mCamera == null) { 7306 info.mCamera = new Camera(); 7307 info.matrix3D = new Matrix(); 7308 } 7309 return -(info.mCamera.getLocationZ() * dpi); 7310 } 7311 7312 /** 7313 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 7314 * views are drawn) from the camera to this view. The camera's distance 7315 * affects 3D transformations, for instance rotations around the X and Y 7316 * axis. If the rotationX or rotationY properties are changed and this view is 7317 * large (more than half the size of the screen), it is recommended to always 7318 * use a camera distance that's greater than the height (X axis rotation) or 7319 * the width (Y axis rotation) of this view.</p> 7320 * 7321 * <p>The distance of the camera from the view plane can have an affect on the 7322 * perspective distortion of the view when it is rotated around the x or y axis. 7323 * For example, a large distance will result in a large viewing angle, and there 7324 * will not be much perspective distortion of the view as it rotates. A short 7325 * distance may cause much more perspective distortion upon rotation, and can 7326 * also result in some drawing artifacts if the rotated view ends up partially 7327 * behind the camera (which is why the recommendation is to use a distance at 7328 * least as far as the size of the view, if the view is to be rotated.)</p> 7329 * 7330 * <p>The distance is expressed in "depth pixels." The default distance depends 7331 * on the screen density. For instance, on a medium density display, the 7332 * default distance is 1280. On a high density display, the default distance 7333 * is 1920.</p> 7334 * 7335 * <p>If you want to specify a distance that leads to visually consistent 7336 * results across various densities, use the following formula:</p> 7337 * <pre> 7338 * float scale = context.getResources().getDisplayMetrics().density; 7339 * view.setCameraDistance(distance * scale); 7340 * </pre> 7341 * 7342 * <p>The density scale factor of a high density display is 1.5, 7343 * and 1920 = 1280 * 1.5.</p> 7344 * 7345 * @param distance The distance in "depth pixels", if negative the opposite 7346 * value is used 7347 * 7348 * @see #setRotationX(float) 7349 * @see #setRotationY(float) 7350 */ 7351 public void setCameraDistance(float distance) { 7352 invalidateParentCaches(); 7353 invalidate(false); 7354 7355 ensureTransformationInfo(); 7356 final float dpi = mResources.getDisplayMetrics().densityDpi; 7357 final TransformationInfo info = mTransformationInfo; 7358 if (info.mCamera == null) { 7359 info.mCamera = new Camera(); 7360 info.matrix3D = new Matrix(); 7361 } 7362 7363 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 7364 info.mMatrixDirty = true; 7365 7366 invalidate(false); 7367 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 7368 mDisplayList.setCameraDistance(distance); 7369 } 7370 } 7371 7372 /** 7373 * The degrees that the view is rotated around the pivot point. 7374 * 7375 * @see #setRotation(float) 7376 * @see #getPivotX() 7377 * @see #getPivotY() 7378 * 7379 * @return The degrees of rotation. 7380 */ 7381 @ViewDebug.ExportedProperty(category = "drawing") 7382 public float getRotation() { 7383 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 7384 } 7385 7386 /** 7387 * Sets the degrees that the view is rotated around the pivot point. Increasing values 7388 * result in clockwise rotation. 7389 * 7390 * @param rotation The degrees of rotation. 7391 * 7392 * @see #getRotation() 7393 * @see #getPivotX() 7394 * @see #getPivotY() 7395 * @see #setRotationX(float) 7396 * @see #setRotationY(float) 7397 * 7398 * @attr ref android.R.styleable#View_rotation 7399 */ 7400 public void setRotation(float rotation) { 7401 ensureTransformationInfo(); 7402 final TransformationInfo info = mTransformationInfo; 7403 if (info.mRotation != rotation) { 7404 invalidateParentCaches(); 7405 // Double-invalidation is necessary to capture view's old and new areas 7406 invalidate(false); 7407 info.mRotation = rotation; 7408 info.mMatrixDirty = true; 7409 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7410 invalidate(false); 7411 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 7412 mDisplayList.setRotation(rotation); 7413 } 7414 } 7415 } 7416 7417 /** 7418 * The degrees that the view is rotated around the vertical axis through the pivot point. 7419 * 7420 * @see #getPivotX() 7421 * @see #getPivotY() 7422 * @see #setRotationY(float) 7423 * 7424 * @return The degrees of Y rotation. 7425 */ 7426 @ViewDebug.ExportedProperty(category = "drawing") 7427 public float getRotationY() { 7428 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 7429 } 7430 7431 /** 7432 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 7433 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 7434 * down the y axis. 7435 * 7436 * When rotating large views, it is recommended to adjust the camera distance 7437 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7438 * 7439 * @param rotationY The degrees of Y rotation. 7440 * 7441 * @see #getRotationY() 7442 * @see #getPivotX() 7443 * @see #getPivotY() 7444 * @see #setRotation(float) 7445 * @see #setRotationX(float) 7446 * @see #setCameraDistance(float) 7447 * 7448 * @attr ref android.R.styleable#View_rotationY 7449 */ 7450 public void setRotationY(float rotationY) { 7451 ensureTransformationInfo(); 7452 final TransformationInfo info = mTransformationInfo; 7453 if (info.mRotationY != rotationY) { 7454 invalidateParentCaches(); 7455 // Double-invalidation is necessary to capture view's old and new areas 7456 invalidate(false); 7457 info.mRotationY = rotationY; 7458 info.mMatrixDirty = true; 7459 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7460 invalidate(false); 7461 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 7462 mDisplayList.setRotationY(rotationY); 7463 } 7464 } 7465 } 7466 7467 /** 7468 * The degrees that the view is rotated around the horizontal axis through the pivot point. 7469 * 7470 * @see #getPivotX() 7471 * @see #getPivotY() 7472 * @see #setRotationX(float) 7473 * 7474 * @return The degrees of X rotation. 7475 */ 7476 @ViewDebug.ExportedProperty(category = "drawing") 7477 public float getRotationX() { 7478 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 7479 } 7480 7481 /** 7482 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 7483 * Increasing values result in clockwise rotation from the viewpoint of looking down the 7484 * x axis. 7485 * 7486 * When rotating large views, it is recommended to adjust the camera distance 7487 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7488 * 7489 * @param rotationX The degrees of X rotation. 7490 * 7491 * @see #getRotationX() 7492 * @see #getPivotX() 7493 * @see #getPivotY() 7494 * @see #setRotation(float) 7495 * @see #setRotationY(float) 7496 * @see #setCameraDistance(float) 7497 * 7498 * @attr ref android.R.styleable#View_rotationX 7499 */ 7500 public void setRotationX(float rotationX) { 7501 ensureTransformationInfo(); 7502 final TransformationInfo info = mTransformationInfo; 7503 if (info.mRotationX != rotationX) { 7504 invalidateParentCaches(); 7505 // Double-invalidation is necessary to capture view's old and new areas 7506 invalidate(false); 7507 info.mRotationX = rotationX; 7508 info.mMatrixDirty = true; 7509 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7510 invalidate(false); 7511 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 7512 mDisplayList.setRotationX(rotationX); 7513 } 7514 } 7515 } 7516 7517 /** 7518 * The amount that the view is scaled in x around the pivot point, as a proportion of 7519 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 7520 * 7521 * <p>By default, this is 1.0f. 7522 * 7523 * @see #getPivotX() 7524 * @see #getPivotY() 7525 * @return The scaling factor. 7526 */ 7527 @ViewDebug.ExportedProperty(category = "drawing") 7528 public float getScaleX() { 7529 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 7530 } 7531 7532 /** 7533 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 7534 * the view's unscaled width. A value of 1 means that no scaling is applied. 7535 * 7536 * @param scaleX The scaling factor. 7537 * @see #getPivotX() 7538 * @see #getPivotY() 7539 * 7540 * @attr ref android.R.styleable#View_scaleX 7541 */ 7542 public void setScaleX(float scaleX) { 7543 ensureTransformationInfo(); 7544 final TransformationInfo info = mTransformationInfo; 7545 if (info.mScaleX != scaleX) { 7546 invalidateParentCaches(); 7547 // Double-invalidation is necessary to capture view's old and new areas 7548 invalidate(false); 7549 info.mScaleX = scaleX; 7550 info.mMatrixDirty = true; 7551 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7552 invalidate(false); 7553 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 7554 mDisplayList.setScaleX(scaleX); 7555 } 7556 } 7557 } 7558 7559 /** 7560 * The amount that the view is scaled in y around the pivot point, as a proportion of 7561 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 7562 * 7563 * <p>By default, this is 1.0f. 7564 * 7565 * @see #getPivotX() 7566 * @see #getPivotY() 7567 * @return The scaling factor. 7568 */ 7569 @ViewDebug.ExportedProperty(category = "drawing") 7570 public float getScaleY() { 7571 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 7572 } 7573 7574 /** 7575 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 7576 * the view's unscaled width. A value of 1 means that no scaling is applied. 7577 * 7578 * @param scaleY The scaling factor. 7579 * @see #getPivotX() 7580 * @see #getPivotY() 7581 * 7582 * @attr ref android.R.styleable#View_scaleY 7583 */ 7584 public void setScaleY(float scaleY) { 7585 ensureTransformationInfo(); 7586 final TransformationInfo info = mTransformationInfo; 7587 if (info.mScaleY != scaleY) { 7588 invalidateParentCaches(); 7589 // Double-invalidation is necessary to capture view's old and new areas 7590 invalidate(false); 7591 info.mScaleY = scaleY; 7592 info.mMatrixDirty = true; 7593 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7594 invalidate(false); 7595 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 7596 mDisplayList.setScaleY(scaleY); 7597 } 7598 } 7599 } 7600 7601 /** 7602 * The x location of the point around which the view is {@link #setRotation(float) rotated} 7603 * and {@link #setScaleX(float) scaled}. 7604 * 7605 * @see #getRotation() 7606 * @see #getScaleX() 7607 * @see #getScaleY() 7608 * @see #getPivotY() 7609 * @return The x location of the pivot point. 7610 */ 7611 @ViewDebug.ExportedProperty(category = "drawing") 7612 public float getPivotX() { 7613 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 7614 } 7615 7616 /** 7617 * Sets the x location of the point around which the view is 7618 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 7619 * By default, the pivot point is centered on the object. 7620 * Setting this property disables this behavior and causes the view to use only the 7621 * explicitly set pivotX and pivotY values. 7622 * 7623 * @param pivotX The x location of the pivot point. 7624 * @see #getRotation() 7625 * @see #getScaleX() 7626 * @see #getScaleY() 7627 * @see #getPivotY() 7628 * 7629 * @attr ref android.R.styleable#View_transformPivotX 7630 */ 7631 public void setPivotX(float pivotX) { 7632 ensureTransformationInfo(); 7633 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7634 final TransformationInfo info = mTransformationInfo; 7635 if (info.mPivotX != pivotX) { 7636 invalidateParentCaches(); 7637 // Double-invalidation is necessary to capture view's old and new areas 7638 invalidate(false); 7639 info.mPivotX = pivotX; 7640 info.mMatrixDirty = true; 7641 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7642 invalidate(false); 7643 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 7644 mDisplayList.setPivotX(pivotX); 7645 } 7646 } 7647 } 7648 7649 /** 7650 * The y location of the point around which the view is {@link #setRotation(float) rotated} 7651 * and {@link #setScaleY(float) scaled}. 7652 * 7653 * @see #getRotation() 7654 * @see #getScaleX() 7655 * @see #getScaleY() 7656 * @see #getPivotY() 7657 * @return The y location of the pivot point. 7658 */ 7659 @ViewDebug.ExportedProperty(category = "drawing") 7660 public float getPivotY() { 7661 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 7662 } 7663 7664 /** 7665 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 7666 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 7667 * Setting this property disables this behavior and causes the view to use only the 7668 * explicitly set pivotX and pivotY values. 7669 * 7670 * @param pivotY The y location of the pivot point. 7671 * @see #getRotation() 7672 * @see #getScaleX() 7673 * @see #getScaleY() 7674 * @see #getPivotY() 7675 * 7676 * @attr ref android.R.styleable#View_transformPivotY 7677 */ 7678 public void setPivotY(float pivotY) { 7679 ensureTransformationInfo(); 7680 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7681 final TransformationInfo info = mTransformationInfo; 7682 if (info.mPivotY != pivotY) { 7683 invalidateParentCaches(); 7684 // Double-invalidation is necessary to capture view's old and new areas 7685 invalidate(false); 7686 info.mPivotY = pivotY; 7687 info.mMatrixDirty = true; 7688 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7689 invalidate(false); 7690 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 7691 mDisplayList.setPivotY(pivotY); 7692 } 7693 } 7694 } 7695 7696 /** 7697 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 7698 * completely transparent and 1 means the view is completely opaque. 7699 * 7700 * <p>By default this is 1.0f. 7701 * @return The opacity of the view. 7702 */ 7703 @ViewDebug.ExportedProperty(category = "drawing") 7704 public float getAlpha() { 7705 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 7706 } 7707 7708 /** 7709 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 7710 * completely transparent and 1 means the view is completely opaque.</p> 7711 * 7712 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 7713 * responsible for applying the opacity itself. Otherwise, calling this method is 7714 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 7715 * setting a hardware layer.</p> 7716 * 7717 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 7718 * performance implications. It is generally best to use the alpha property sparingly and 7719 * transiently, as in the case of fading animations.</p> 7720 * 7721 * @param alpha The opacity of the view. 7722 * 7723 * @see #setLayerType(int, android.graphics.Paint) 7724 * 7725 * @attr ref android.R.styleable#View_alpha 7726 */ 7727 public void setAlpha(float alpha) { 7728 ensureTransformationInfo(); 7729 if (mTransformationInfo.mAlpha != alpha) { 7730 mTransformationInfo.mAlpha = alpha; 7731 invalidateParentCaches(); 7732 if (onSetAlpha((int) (alpha * 255))) { 7733 mPrivateFlags |= ALPHA_SET; 7734 // subclass is handling alpha - don't optimize rendering cache invalidation 7735 invalidate(true); 7736 } else { 7737 mPrivateFlags &= ~ALPHA_SET; 7738 invalidate(false); 7739 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 7740 mDisplayList.setAlpha(alpha); 7741 } 7742 } 7743 } 7744 } 7745 7746 /** 7747 * Faster version of setAlpha() which performs the same steps except there are 7748 * no calls to invalidate(). The caller of this function should perform proper invalidation 7749 * on the parent and this object. The return value indicates whether the subclass handles 7750 * alpha (the return value for onSetAlpha()). 7751 * 7752 * @param alpha The new value for the alpha property 7753 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 7754 * the new value for the alpha property is different from the old value 7755 */ 7756 boolean setAlphaNoInvalidation(float alpha) { 7757 ensureTransformationInfo(); 7758 if (mTransformationInfo.mAlpha != alpha) { 7759 mTransformationInfo.mAlpha = alpha; 7760 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 7761 if (subclassHandlesAlpha) { 7762 mPrivateFlags |= ALPHA_SET; 7763 return true; 7764 } else { 7765 mPrivateFlags &= ~ALPHA_SET; 7766 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 7767 mDisplayList.setAlpha(alpha); 7768 } 7769 } 7770 } 7771 return false; 7772 } 7773 7774 /** 7775 * Top position of this view relative to its parent. 7776 * 7777 * @return The top of this view, in pixels. 7778 */ 7779 @ViewDebug.CapturedViewProperty 7780 public final int getTop() { 7781 return mTop; 7782 } 7783 7784 /** 7785 * Sets the top position of this view relative to its parent. This method is meant to be called 7786 * by the layout system and should not generally be called otherwise, because the property 7787 * may be changed at any time by the layout. 7788 * 7789 * @param top The top of this view, in pixels. 7790 */ 7791 public final void setTop(int top) { 7792 if (top != mTop) { 7793 updateMatrix(); 7794 final boolean matrixIsIdentity = mTransformationInfo == null 7795 || mTransformationInfo.mMatrixIsIdentity; 7796 if (matrixIsIdentity) { 7797 if (mAttachInfo != null) { 7798 int minTop; 7799 int yLoc; 7800 if (top < mTop) { 7801 minTop = top; 7802 yLoc = top - mTop; 7803 } else { 7804 minTop = mTop; 7805 yLoc = 0; 7806 } 7807 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 7808 } 7809 } else { 7810 // Double-invalidation is necessary to capture view's old and new areas 7811 invalidate(true); 7812 } 7813 7814 int width = mRight - mLeft; 7815 int oldHeight = mBottom - mTop; 7816 7817 mTop = top; 7818 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 7819 mDisplayList.setTop(mTop); 7820 } 7821 7822 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7823 7824 if (!matrixIsIdentity) { 7825 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7826 // A change in dimension means an auto-centered pivot point changes, too 7827 mTransformationInfo.mMatrixDirty = true; 7828 } 7829 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7830 invalidate(true); 7831 } 7832 mBackgroundSizeChanged = true; 7833 invalidateParentIfNeeded(); 7834 } 7835 } 7836 7837 /** 7838 * Bottom position of this view relative to its parent. 7839 * 7840 * @return The bottom of this view, in pixels. 7841 */ 7842 @ViewDebug.CapturedViewProperty 7843 public final int getBottom() { 7844 return mBottom; 7845 } 7846 7847 /** 7848 * True if this view has changed since the last time being drawn. 7849 * 7850 * @return The dirty state of this view. 7851 */ 7852 public boolean isDirty() { 7853 return (mPrivateFlags & DIRTY_MASK) != 0; 7854 } 7855 7856 /** 7857 * Sets the bottom position of this view relative to its parent. This method is meant to be 7858 * called by the layout system and should not generally be called otherwise, because the 7859 * property may be changed at any time by the layout. 7860 * 7861 * @param bottom The bottom of this view, in pixels. 7862 */ 7863 public final void setBottom(int bottom) { 7864 if (bottom != mBottom) { 7865 updateMatrix(); 7866 final boolean matrixIsIdentity = mTransformationInfo == null 7867 || mTransformationInfo.mMatrixIsIdentity; 7868 if (matrixIsIdentity) { 7869 if (mAttachInfo != null) { 7870 int maxBottom; 7871 if (bottom < mBottom) { 7872 maxBottom = mBottom; 7873 } else { 7874 maxBottom = bottom; 7875 } 7876 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 7877 } 7878 } else { 7879 // Double-invalidation is necessary to capture view's old and new areas 7880 invalidate(true); 7881 } 7882 7883 int width = mRight - mLeft; 7884 int oldHeight = mBottom - mTop; 7885 7886 mBottom = bottom; 7887 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 7888 mDisplayList.setBottom(mBottom); 7889 } 7890 7891 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7892 7893 if (!matrixIsIdentity) { 7894 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7895 // A change in dimension means an auto-centered pivot point changes, too 7896 mTransformationInfo.mMatrixDirty = true; 7897 } 7898 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7899 invalidate(true); 7900 } 7901 mBackgroundSizeChanged = true; 7902 invalidateParentIfNeeded(); 7903 } 7904 } 7905 7906 /** 7907 * Left position of this view relative to its parent. 7908 * 7909 * @return The left edge of this view, in pixels. 7910 */ 7911 @ViewDebug.CapturedViewProperty 7912 public final int getLeft() { 7913 return mLeft; 7914 } 7915 7916 /** 7917 * Sets the left position of this view relative to its parent. This method is meant to be called 7918 * by the layout system and should not generally be called otherwise, because the property 7919 * may be changed at any time by the layout. 7920 * 7921 * @param left The bottom of this view, in pixels. 7922 */ 7923 public final void setLeft(int left) { 7924 if (left != mLeft) { 7925 updateMatrix(); 7926 final boolean matrixIsIdentity = mTransformationInfo == null 7927 || mTransformationInfo.mMatrixIsIdentity; 7928 if (matrixIsIdentity) { 7929 if (mAttachInfo != null) { 7930 int minLeft; 7931 int xLoc; 7932 if (left < mLeft) { 7933 minLeft = left; 7934 xLoc = left - mLeft; 7935 } else { 7936 minLeft = mLeft; 7937 xLoc = 0; 7938 } 7939 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 7940 } 7941 } else { 7942 // Double-invalidation is necessary to capture view's old and new areas 7943 invalidate(true); 7944 } 7945 7946 int oldWidth = mRight - mLeft; 7947 int height = mBottom - mTop; 7948 7949 mLeft = left; 7950 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 7951 mDisplayList.setLeft(left); 7952 } 7953 7954 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7955 7956 if (!matrixIsIdentity) { 7957 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7958 // A change in dimension means an auto-centered pivot point changes, too 7959 mTransformationInfo.mMatrixDirty = true; 7960 } 7961 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7962 invalidate(true); 7963 } 7964 mBackgroundSizeChanged = true; 7965 invalidateParentIfNeeded(); 7966 if (USE_DISPLAY_LIST_PROPERTIES) { 7967 7968 } 7969 } 7970 } 7971 7972 /** 7973 * Right position of this view relative to its parent. 7974 * 7975 * @return The right edge of this view, in pixels. 7976 */ 7977 @ViewDebug.CapturedViewProperty 7978 public final int getRight() { 7979 return mRight; 7980 } 7981 7982 /** 7983 * Sets the right position of this view relative to its parent. This method is meant to be called 7984 * by the layout system and should not generally be called otherwise, because the property 7985 * may be changed at any time by the layout. 7986 * 7987 * @param right The bottom of this view, in pixels. 7988 */ 7989 public final void setRight(int right) { 7990 if (right != mRight) { 7991 updateMatrix(); 7992 final boolean matrixIsIdentity = mTransformationInfo == null 7993 || mTransformationInfo.mMatrixIsIdentity; 7994 if (matrixIsIdentity) { 7995 if (mAttachInfo != null) { 7996 int maxRight; 7997 if (right < mRight) { 7998 maxRight = mRight; 7999 } else { 8000 maxRight = right; 8001 } 8002 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 8003 } 8004 } else { 8005 // Double-invalidation is necessary to capture view's old and new areas 8006 invalidate(true); 8007 } 8008 8009 int oldWidth = mRight - mLeft; 8010 int height = mBottom - mTop; 8011 8012 mRight = right; 8013 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8014 mDisplayList.setRight(mRight); 8015 } 8016 8017 onSizeChanged(mRight - mLeft, height, oldWidth, height); 8018 8019 if (!matrixIsIdentity) { 8020 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8021 // A change in dimension means an auto-centered pivot point changes, too 8022 mTransformationInfo.mMatrixDirty = true; 8023 } 8024 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8025 invalidate(true); 8026 } 8027 mBackgroundSizeChanged = true; 8028 invalidateParentIfNeeded(); 8029 } 8030 } 8031 8032 /** 8033 * The visual x position of this view, in pixels. This is equivalent to the 8034 * {@link #setTranslationX(float) translationX} property plus the current 8035 * {@link #getLeft() left} property. 8036 * 8037 * @return The visual x position of this view, in pixels. 8038 */ 8039 @ViewDebug.ExportedProperty(category = "drawing") 8040 public float getX() { 8041 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 8042 } 8043 8044 /** 8045 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 8046 * {@link #setTranslationX(float) translationX} property to be the difference between 8047 * the x value passed in and the current {@link #getLeft() left} property. 8048 * 8049 * @param x The visual x position of this view, in pixels. 8050 */ 8051 public void setX(float x) { 8052 setTranslationX(x - mLeft); 8053 } 8054 8055 /** 8056 * The visual y position of this view, in pixels. This is equivalent to the 8057 * {@link #setTranslationY(float) translationY} property plus the current 8058 * {@link #getTop() top} property. 8059 * 8060 * @return The visual y position of this view, in pixels. 8061 */ 8062 @ViewDebug.ExportedProperty(category = "drawing") 8063 public float getY() { 8064 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 8065 } 8066 8067 /** 8068 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 8069 * {@link #setTranslationY(float) translationY} property to be the difference between 8070 * the y value passed in and the current {@link #getTop() top} property. 8071 * 8072 * @param y The visual y position of this view, in pixels. 8073 */ 8074 public void setY(float y) { 8075 setTranslationY(y - mTop); 8076 } 8077 8078 8079 /** 8080 * The horizontal location of this view relative to its {@link #getLeft() left} position. 8081 * This position is post-layout, in addition to wherever the object's 8082 * layout placed it. 8083 * 8084 * @return The horizontal position of this view relative to its left position, in pixels. 8085 */ 8086 @ViewDebug.ExportedProperty(category = "drawing") 8087 public float getTranslationX() { 8088 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 8089 } 8090 8091 /** 8092 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 8093 * This effectively positions the object post-layout, in addition to wherever the object's 8094 * layout placed it. 8095 * 8096 * @param translationX The horizontal position of this view relative to its left position, 8097 * in pixels. 8098 * 8099 * @attr ref android.R.styleable#View_translationX 8100 */ 8101 public void setTranslationX(float translationX) { 8102 ensureTransformationInfo(); 8103 final TransformationInfo info = mTransformationInfo; 8104 if (info.mTranslationX != translationX) { 8105 invalidateParentCaches(); 8106 // Double-invalidation is necessary to capture view's old and new areas 8107 invalidate(false); 8108 info.mTranslationX = translationX; 8109 info.mMatrixDirty = true; 8110 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8111 invalidate(false); 8112 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8113 mDisplayList.setTranslationX(translationX); 8114 } 8115 } 8116 } 8117 8118 /** 8119 * The horizontal location of this view relative to its {@link #getTop() top} position. 8120 * This position is post-layout, in addition to wherever the object's 8121 * layout placed it. 8122 * 8123 * @return The vertical position of this view relative to its top position, 8124 * in pixels. 8125 */ 8126 @ViewDebug.ExportedProperty(category = "drawing") 8127 public float getTranslationY() { 8128 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 8129 } 8130 8131 /** 8132 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 8133 * This effectively positions the object post-layout, in addition to wherever the object's 8134 * layout placed it. 8135 * 8136 * @param translationY The vertical position of this view relative to its top position, 8137 * in pixels. 8138 * 8139 * @attr ref android.R.styleable#View_translationY 8140 */ 8141 public void setTranslationY(float translationY) { 8142 ensureTransformationInfo(); 8143 final TransformationInfo info = mTransformationInfo; 8144 if (info.mTranslationY != translationY) { 8145 invalidateParentCaches(); 8146 // Double-invalidation is necessary to capture view's old and new areas 8147 invalidate(false); 8148 info.mTranslationY = translationY; 8149 info.mMatrixDirty = true; 8150 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8151 invalidate(false); 8152 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8153 mDisplayList.setTranslationY(translationY); 8154 } 8155 } 8156 } 8157 8158 /** 8159 * Hit rectangle in parent's coordinates 8160 * 8161 * @param outRect The hit rectangle of the view. 8162 */ 8163 public void getHitRect(Rect outRect) { 8164 updateMatrix(); 8165 final TransformationInfo info = mTransformationInfo; 8166 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 8167 outRect.set(mLeft, mTop, mRight, mBottom); 8168 } else { 8169 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 8170 tmpRect.set(-info.mPivotX, -info.mPivotY, 8171 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 8172 info.mMatrix.mapRect(tmpRect); 8173 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 8174 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 8175 } 8176 } 8177 8178 /** 8179 * Determines whether the given point, in local coordinates is inside the view. 8180 */ 8181 /*package*/ final boolean pointInView(float localX, float localY) { 8182 return localX >= 0 && localX < (mRight - mLeft) 8183 && localY >= 0 && localY < (mBottom - mTop); 8184 } 8185 8186 /** 8187 * Utility method to determine whether the given point, in local coordinates, 8188 * is inside the view, where the area of the view is expanded by the slop factor. 8189 * This method is called while processing touch-move events to determine if the event 8190 * is still within the view. 8191 */ 8192 private boolean pointInView(float localX, float localY, float slop) { 8193 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 8194 localY < ((mBottom - mTop) + slop); 8195 } 8196 8197 /** 8198 * When a view has focus and the user navigates away from it, the next view is searched for 8199 * starting from the rectangle filled in by this method. 8200 * 8201 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 8202 * of the view. However, if your view maintains some idea of internal selection, 8203 * such as a cursor, or a selected row or column, you should override this method and 8204 * fill in a more specific rectangle. 8205 * 8206 * @param r The rectangle to fill in, in this view's coordinates. 8207 */ 8208 public void getFocusedRect(Rect r) { 8209 getDrawingRect(r); 8210 } 8211 8212 /** 8213 * If some part of this view is not clipped by any of its parents, then 8214 * return that area in r in global (root) coordinates. To convert r to local 8215 * coordinates (without taking possible View rotations into account), offset 8216 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 8217 * If the view is completely clipped or translated out, return false. 8218 * 8219 * @param r If true is returned, r holds the global coordinates of the 8220 * visible portion of this view. 8221 * @param globalOffset If true is returned, globalOffset holds the dx,dy 8222 * between this view and its root. globalOffet may be null. 8223 * @return true if r is non-empty (i.e. part of the view is visible at the 8224 * root level. 8225 */ 8226 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 8227 int width = mRight - mLeft; 8228 int height = mBottom - mTop; 8229 if (width > 0 && height > 0) { 8230 r.set(0, 0, width, height); 8231 if (globalOffset != null) { 8232 globalOffset.set(-mScrollX, -mScrollY); 8233 } 8234 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 8235 } 8236 return false; 8237 } 8238 8239 public final boolean getGlobalVisibleRect(Rect r) { 8240 return getGlobalVisibleRect(r, null); 8241 } 8242 8243 public final boolean getLocalVisibleRect(Rect r) { 8244 Point offset = new Point(); 8245 if (getGlobalVisibleRect(r, offset)) { 8246 r.offset(-offset.x, -offset.y); // make r local 8247 return true; 8248 } 8249 return false; 8250 } 8251 8252 /** 8253 * Offset this view's vertical location by the specified number of pixels. 8254 * 8255 * @param offset the number of pixels to offset the view by 8256 */ 8257 public void offsetTopAndBottom(int offset) { 8258 if (offset != 0) { 8259 updateMatrix(); 8260 final boolean matrixIsIdentity = mTransformationInfo == null 8261 || mTransformationInfo.mMatrixIsIdentity; 8262 if (matrixIsIdentity) { 8263 final ViewParent p = mParent; 8264 if (p != null && mAttachInfo != null) { 8265 final Rect r = mAttachInfo.mTmpInvalRect; 8266 int minTop; 8267 int maxBottom; 8268 int yLoc; 8269 if (offset < 0) { 8270 minTop = mTop + offset; 8271 maxBottom = mBottom; 8272 yLoc = offset; 8273 } else { 8274 minTop = mTop; 8275 maxBottom = mBottom + offset; 8276 yLoc = 0; 8277 } 8278 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 8279 p.invalidateChild(this, r); 8280 } 8281 } else { 8282 invalidate(false); 8283 } 8284 8285 mTop += offset; 8286 mBottom += offset; 8287 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8288 mDisplayList.offsetTopBottom(offset); 8289 } 8290 8291 if (!matrixIsIdentity) { 8292 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8293 invalidate(false); 8294 } 8295 invalidateParentIfNeeded(); 8296 } 8297 } 8298 8299 /** 8300 * Offset this view's horizontal location by the specified amount of pixels. 8301 * 8302 * @param offset the numer of pixels to offset the view by 8303 */ 8304 public void offsetLeftAndRight(int offset) { 8305 if (offset != 0) { 8306 updateMatrix(); 8307 final boolean matrixIsIdentity = mTransformationInfo == null 8308 || mTransformationInfo.mMatrixIsIdentity; 8309 if (matrixIsIdentity) { 8310 final ViewParent p = mParent; 8311 if (p != null && mAttachInfo != null) { 8312 final Rect r = mAttachInfo.mTmpInvalRect; 8313 int minLeft; 8314 int maxRight; 8315 if (offset < 0) { 8316 minLeft = mLeft + offset; 8317 maxRight = mRight; 8318 } else { 8319 minLeft = mLeft; 8320 maxRight = mRight + offset; 8321 } 8322 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 8323 p.invalidateChild(this, r); 8324 } 8325 } else { 8326 invalidate(false); 8327 } 8328 8329 mLeft += offset; 8330 mRight += offset; 8331 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8332 mDisplayList.offsetLeftRight(offset); 8333 } 8334 8335 if (!matrixIsIdentity) { 8336 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8337 invalidate(false); 8338 } 8339 invalidateParentIfNeeded(); 8340 } 8341 } 8342 8343 /** 8344 * Get the LayoutParams associated with this view. All views should have 8345 * layout parameters. These supply parameters to the <i>parent</i> of this 8346 * view specifying how it should be arranged. There are many subclasses of 8347 * ViewGroup.LayoutParams, and these correspond to the different subclasses 8348 * of ViewGroup that are responsible for arranging their children. 8349 * 8350 * This method may return null if this View is not attached to a parent 8351 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 8352 * was not invoked successfully. When a View is attached to a parent 8353 * ViewGroup, this method must not return null. 8354 * 8355 * @return The LayoutParams associated with this view, or null if no 8356 * parameters have been set yet 8357 */ 8358 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 8359 public ViewGroup.LayoutParams getLayoutParams() { 8360 return mLayoutParams; 8361 } 8362 8363 /** 8364 * Set the layout parameters associated with this view. These supply 8365 * parameters to the <i>parent</i> of this view specifying how it should be 8366 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 8367 * correspond to the different subclasses of ViewGroup that are responsible 8368 * for arranging their children. 8369 * 8370 * @param params The layout parameters for this view, cannot be null 8371 */ 8372 public void setLayoutParams(ViewGroup.LayoutParams params) { 8373 if (params == null) { 8374 throw new NullPointerException("Layout parameters cannot be null"); 8375 } 8376 mLayoutParams = params; 8377 if (mParent instanceof ViewGroup) { 8378 ((ViewGroup) mParent).onSetLayoutParams(this, params); 8379 } 8380 requestLayout(); 8381 } 8382 8383 /** 8384 * Set the scrolled position of your view. This will cause a call to 8385 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8386 * invalidated. 8387 * @param x the x position to scroll to 8388 * @param y the y position to scroll to 8389 */ 8390 public void scrollTo(int x, int y) { 8391 if (mScrollX != x || mScrollY != y) { 8392 int oldX = mScrollX; 8393 int oldY = mScrollY; 8394 mScrollX = x; 8395 mScrollY = y; 8396 invalidateParentCaches(); 8397 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 8398 if (!awakenScrollBars()) { 8399 invalidate(true); 8400 } 8401 } 8402 } 8403 8404 /** 8405 * Move the scrolled position of your view. This will cause a call to 8406 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8407 * invalidated. 8408 * @param x the amount of pixels to scroll by horizontally 8409 * @param y the amount of pixels to scroll by vertically 8410 */ 8411 public void scrollBy(int x, int y) { 8412 scrollTo(mScrollX + x, mScrollY + y); 8413 } 8414 8415 /** 8416 * <p>Trigger the scrollbars to draw. When invoked this method starts an 8417 * animation to fade the scrollbars out after a default delay. If a subclass 8418 * provides animated scrolling, the start delay should equal the duration 8419 * of the scrolling animation.</p> 8420 * 8421 * <p>The animation starts only if at least one of the scrollbars is 8422 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 8423 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8424 * this method returns true, and false otherwise. If the animation is 8425 * started, this method calls {@link #invalidate()}; in that case the 8426 * caller should not call {@link #invalidate()}.</p> 8427 * 8428 * <p>This method should be invoked every time a subclass directly updates 8429 * the scroll parameters.</p> 8430 * 8431 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 8432 * and {@link #scrollTo(int, int)}.</p> 8433 * 8434 * @return true if the animation is played, false otherwise 8435 * 8436 * @see #awakenScrollBars(int) 8437 * @see #scrollBy(int, int) 8438 * @see #scrollTo(int, int) 8439 * @see #isHorizontalScrollBarEnabled() 8440 * @see #isVerticalScrollBarEnabled() 8441 * @see #setHorizontalScrollBarEnabled(boolean) 8442 * @see #setVerticalScrollBarEnabled(boolean) 8443 */ 8444 protected boolean awakenScrollBars() { 8445 return mScrollCache != null && 8446 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 8447 } 8448 8449 /** 8450 * Trigger the scrollbars to draw. 8451 * This method differs from awakenScrollBars() only in its default duration. 8452 * initialAwakenScrollBars() will show the scroll bars for longer than 8453 * usual to give the user more of a chance to notice them. 8454 * 8455 * @return true if the animation is played, false otherwise. 8456 */ 8457 private boolean initialAwakenScrollBars() { 8458 return mScrollCache != null && 8459 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 8460 } 8461 8462 /** 8463 * <p> 8464 * Trigger the scrollbars to draw. When invoked this method starts an 8465 * animation to fade the scrollbars out after a fixed delay. If a subclass 8466 * provides animated scrolling, the start delay should equal the duration of 8467 * the scrolling animation. 8468 * </p> 8469 * 8470 * <p> 8471 * The animation starts only if at least one of the scrollbars is enabled, 8472 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8473 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8474 * this method returns true, and false otherwise. If the animation is 8475 * started, this method calls {@link #invalidate()}; in that case the caller 8476 * should not call {@link #invalidate()}. 8477 * </p> 8478 * 8479 * <p> 8480 * This method should be invoked everytime a subclass directly updates the 8481 * scroll parameters. 8482 * </p> 8483 * 8484 * @param startDelay the delay, in milliseconds, after which the animation 8485 * should start; when the delay is 0, the animation starts 8486 * immediately 8487 * @return true if the animation is played, false otherwise 8488 * 8489 * @see #scrollBy(int, int) 8490 * @see #scrollTo(int, int) 8491 * @see #isHorizontalScrollBarEnabled() 8492 * @see #isVerticalScrollBarEnabled() 8493 * @see #setHorizontalScrollBarEnabled(boolean) 8494 * @see #setVerticalScrollBarEnabled(boolean) 8495 */ 8496 protected boolean awakenScrollBars(int startDelay) { 8497 return awakenScrollBars(startDelay, true); 8498 } 8499 8500 /** 8501 * <p> 8502 * Trigger the scrollbars to draw. When invoked this method starts an 8503 * animation to fade the scrollbars out after a fixed delay. If a subclass 8504 * provides animated scrolling, the start delay should equal the duration of 8505 * the scrolling animation. 8506 * </p> 8507 * 8508 * <p> 8509 * The animation starts only if at least one of the scrollbars is enabled, 8510 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8511 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8512 * this method returns true, and false otherwise. If the animation is 8513 * started, this method calls {@link #invalidate()} if the invalidate parameter 8514 * is set to true; in that case the caller 8515 * should not call {@link #invalidate()}. 8516 * </p> 8517 * 8518 * <p> 8519 * This method should be invoked everytime a subclass directly updates the 8520 * scroll parameters. 8521 * </p> 8522 * 8523 * @param startDelay the delay, in milliseconds, after which the animation 8524 * should start; when the delay is 0, the animation starts 8525 * immediately 8526 * 8527 * @param invalidate Wheter this method should call invalidate 8528 * 8529 * @return true if the animation is played, false otherwise 8530 * 8531 * @see #scrollBy(int, int) 8532 * @see #scrollTo(int, int) 8533 * @see #isHorizontalScrollBarEnabled() 8534 * @see #isVerticalScrollBarEnabled() 8535 * @see #setHorizontalScrollBarEnabled(boolean) 8536 * @see #setVerticalScrollBarEnabled(boolean) 8537 */ 8538 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 8539 final ScrollabilityCache scrollCache = mScrollCache; 8540 8541 if (scrollCache == null || !scrollCache.fadeScrollBars) { 8542 return false; 8543 } 8544 8545 if (scrollCache.scrollBar == null) { 8546 scrollCache.scrollBar = new ScrollBarDrawable(); 8547 } 8548 8549 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 8550 8551 if (invalidate) { 8552 // Invalidate to show the scrollbars 8553 invalidate(true); 8554 } 8555 8556 if (scrollCache.state == ScrollabilityCache.OFF) { 8557 // FIXME: this is copied from WindowManagerService. 8558 // We should get this value from the system when it 8559 // is possible to do so. 8560 final int KEY_REPEAT_FIRST_DELAY = 750; 8561 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 8562 } 8563 8564 // Tell mScrollCache when we should start fading. This may 8565 // extend the fade start time if one was already scheduled 8566 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 8567 scrollCache.fadeStartTime = fadeStartTime; 8568 scrollCache.state = ScrollabilityCache.ON; 8569 8570 // Schedule our fader to run, unscheduling any old ones first 8571 if (mAttachInfo != null) { 8572 mAttachInfo.mHandler.removeCallbacks(scrollCache); 8573 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 8574 } 8575 8576 return true; 8577 } 8578 8579 return false; 8580 } 8581 8582 /** 8583 * Do not invalidate views which are not visible and which are not running an animation. They 8584 * will not get drawn and they should not set dirty flags as if they will be drawn 8585 */ 8586 private boolean skipInvalidate() { 8587 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 8588 (!(mParent instanceof ViewGroup) || 8589 !((ViewGroup) mParent).isViewTransitioning(this)); 8590 } 8591 /** 8592 * Mark the area defined by dirty as needing to be drawn. If the view is 8593 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 8594 * in the future. This must be called from a UI thread. To call from a non-UI 8595 * thread, call {@link #postInvalidate()}. 8596 * 8597 * WARNING: This method is destructive to dirty. 8598 * @param dirty the rectangle representing the bounds of the dirty region 8599 */ 8600 public void invalidate(Rect dirty) { 8601 if (ViewDebug.TRACE_HIERARCHY) { 8602 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8603 } 8604 8605 if (skipInvalidate()) { 8606 return; 8607 } 8608 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8609 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8610 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8611 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8612 mPrivateFlags |= INVALIDATED; 8613 mPrivateFlags |= DIRTY; 8614 final ViewParent p = mParent; 8615 final AttachInfo ai = mAttachInfo; 8616 //noinspection PointlessBooleanExpression,ConstantConditions 8617 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8618 if (p != null && ai != null && ai.mHardwareAccelerated) { 8619 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8620 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8621 p.invalidateChild(this, null); 8622 return; 8623 } 8624 } 8625 if (p != null && ai != null) { 8626 final int scrollX = mScrollX; 8627 final int scrollY = mScrollY; 8628 final Rect r = ai.mTmpInvalRect; 8629 r.set(dirty.left - scrollX, dirty.top - scrollY, 8630 dirty.right - scrollX, dirty.bottom - scrollY); 8631 mParent.invalidateChild(this, r); 8632 } 8633 } 8634 } 8635 8636 /** 8637 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 8638 * The coordinates of the dirty rect are relative to the view. 8639 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 8640 * will be called at some point in the future. This must be called from 8641 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 8642 * @param l the left position of the dirty region 8643 * @param t the top position of the dirty region 8644 * @param r the right position of the dirty region 8645 * @param b the bottom position of the dirty region 8646 */ 8647 public void invalidate(int l, int t, int r, int b) { 8648 if (ViewDebug.TRACE_HIERARCHY) { 8649 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8650 } 8651 8652 if (skipInvalidate()) { 8653 return; 8654 } 8655 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8656 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8657 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8658 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8659 mPrivateFlags |= INVALIDATED; 8660 mPrivateFlags |= DIRTY; 8661 final ViewParent p = mParent; 8662 final AttachInfo ai = mAttachInfo; 8663 //noinspection PointlessBooleanExpression,ConstantConditions 8664 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8665 if (p != null && ai != null && ai.mHardwareAccelerated) { 8666 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8667 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8668 p.invalidateChild(this, null); 8669 return; 8670 } 8671 } 8672 if (p != null && ai != null && l < r && t < b) { 8673 final int scrollX = mScrollX; 8674 final int scrollY = mScrollY; 8675 final Rect tmpr = ai.mTmpInvalRect; 8676 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 8677 p.invalidateChild(this, tmpr); 8678 } 8679 } 8680 } 8681 8682 /** 8683 * Invalidate the whole view. If the view is visible, 8684 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 8685 * the future. This must be called from a UI thread. To call from a non-UI thread, 8686 * call {@link #postInvalidate()}. 8687 */ 8688 public void invalidate() { 8689 invalidate(true); 8690 } 8691 8692 /** 8693 * This is where the invalidate() work actually happens. A full invalidate() 8694 * causes the drawing cache to be invalidated, but this function can be called with 8695 * invalidateCache set to false to skip that invalidation step for cases that do not 8696 * need it (for example, a component that remains at the same dimensions with the same 8697 * content). 8698 * 8699 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 8700 * well. This is usually true for a full invalidate, but may be set to false if the 8701 * View's contents or dimensions have not changed. 8702 */ 8703 void invalidate(boolean invalidateCache) { 8704 if (ViewDebug.TRACE_HIERARCHY) { 8705 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8706 } 8707 8708 if (skipInvalidate()) { 8709 return; 8710 } 8711 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8712 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 8713 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 8714 mLastIsOpaque = isOpaque(); 8715 mPrivateFlags &= ~DRAWN; 8716 mPrivateFlags |= DIRTY; 8717 if (invalidateCache) { 8718 mPrivateFlags |= INVALIDATED; 8719 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8720 } 8721 final AttachInfo ai = mAttachInfo; 8722 final ViewParent p = mParent; 8723 //noinspection PointlessBooleanExpression,ConstantConditions 8724 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8725 if (p != null && ai != null && ai.mHardwareAccelerated) { 8726 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8727 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8728 p.invalidateChild(this, null); 8729 return; 8730 } 8731 } 8732 8733 if (p != null && ai != null) { 8734 final Rect r = ai.mTmpInvalRect; 8735 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8736 // Don't call invalidate -- we don't want to internally scroll 8737 // our own bounds 8738 p.invalidateChild(this, r); 8739 } 8740 } 8741 } 8742 8743 /** 8744 * Used to indicate that the parent of this view should clear its caches. This functionality 8745 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8746 * which is necessary when various parent-managed properties of the view change, such as 8747 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 8748 * clears the parent caches and does not causes an invalidate event. 8749 * 8750 * @hide 8751 */ 8752 protected void invalidateParentCaches() { 8753 if (mParent instanceof View) { 8754 ((View) mParent).mPrivateFlags |= INVALIDATED; 8755 } 8756 } 8757 8758 /** 8759 * Used to indicate that the parent of this view should be invalidated. This functionality 8760 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8761 * which is necessary when various parent-managed properties of the view change, such as 8762 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 8763 * an invalidation event to the parent. 8764 * 8765 * @hide 8766 */ 8767 protected void invalidateParentIfNeeded() { 8768 if (isHardwareAccelerated() && mParent instanceof View) { 8769 ((View) mParent).invalidate(true); 8770 } 8771 } 8772 8773 /** 8774 * Indicates whether this View is opaque. An opaque View guarantees that it will 8775 * draw all the pixels overlapping its bounds using a fully opaque color. 8776 * 8777 * Subclasses of View should override this method whenever possible to indicate 8778 * whether an instance is opaque. Opaque Views are treated in a special way by 8779 * the View hierarchy, possibly allowing it to perform optimizations during 8780 * invalidate/draw passes. 8781 * 8782 * @return True if this View is guaranteed to be fully opaque, false otherwise. 8783 */ 8784 @ViewDebug.ExportedProperty(category = "drawing") 8785 public boolean isOpaque() { 8786 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 8787 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 8788 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 8789 } 8790 8791 /** 8792 * @hide 8793 */ 8794 protected void computeOpaqueFlags() { 8795 // Opaque if: 8796 // - Has a background 8797 // - Background is opaque 8798 // - Doesn't have scrollbars or scrollbars are inside overlay 8799 8800 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 8801 mPrivateFlags |= OPAQUE_BACKGROUND; 8802 } else { 8803 mPrivateFlags &= ~OPAQUE_BACKGROUND; 8804 } 8805 8806 final int flags = mViewFlags; 8807 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 8808 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 8809 mPrivateFlags |= OPAQUE_SCROLLBARS; 8810 } else { 8811 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 8812 } 8813 } 8814 8815 /** 8816 * @hide 8817 */ 8818 protected boolean hasOpaqueScrollbars() { 8819 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 8820 } 8821 8822 /** 8823 * @return A handler associated with the thread running the View. This 8824 * handler can be used to pump events in the UI events queue. 8825 */ 8826 public Handler getHandler() { 8827 if (mAttachInfo != null) { 8828 return mAttachInfo.mHandler; 8829 } 8830 return null; 8831 } 8832 8833 /** 8834 * Gets the view root associated with the View. 8835 * @return The view root, or null if none. 8836 * @hide 8837 */ 8838 public ViewRootImpl getViewRootImpl() { 8839 if (mAttachInfo != null) { 8840 return mAttachInfo.mViewRootImpl; 8841 } 8842 return null; 8843 } 8844 8845 /** 8846 * <p>Causes the Runnable to be added to the message queue. 8847 * The runnable will be run on the user interface thread.</p> 8848 * 8849 * <p>This method can be invoked from outside of the UI thread 8850 * only when this View is attached to a window.</p> 8851 * 8852 * @param action The Runnable that will be executed. 8853 * 8854 * @return Returns true if the Runnable was successfully placed in to the 8855 * message queue. Returns false on failure, usually because the 8856 * looper processing the message queue is exiting. 8857 */ 8858 public boolean post(Runnable action) { 8859 final AttachInfo attachInfo = mAttachInfo; 8860 if (attachInfo != null) { 8861 return attachInfo.mHandler.post(action); 8862 } 8863 // Assume that post will succeed later 8864 ViewRootImpl.getRunQueue().post(action); 8865 return true; 8866 } 8867 8868 /** 8869 * <p>Causes the Runnable to be added to the message queue, to be run 8870 * after the specified amount of time elapses. 8871 * The runnable will be run on the user interface thread.</p> 8872 * 8873 * <p>This method can be invoked from outside of the UI thread 8874 * only when this View is attached to a window.</p> 8875 * 8876 * @param action The Runnable that will be executed. 8877 * @param delayMillis The delay (in milliseconds) until the Runnable 8878 * will be executed. 8879 * 8880 * @return true if the Runnable was successfully placed in to the 8881 * message queue. Returns false on failure, usually because the 8882 * looper processing the message queue is exiting. Note that a 8883 * result of true does not mean the Runnable will be processed -- 8884 * if the looper is quit before the delivery time of the message 8885 * occurs then the message will be dropped. 8886 */ 8887 public boolean postDelayed(Runnable action, long delayMillis) { 8888 final AttachInfo attachInfo = mAttachInfo; 8889 if (attachInfo != null) { 8890 return attachInfo.mHandler.postDelayed(action, delayMillis); 8891 } 8892 // Assume that post will succeed later 8893 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 8894 return true; 8895 } 8896 8897 /** 8898 * <p>Causes the Runnable to execute on the next animation time step. 8899 * The runnable will be run on the user interface thread.</p> 8900 * 8901 * <p>This method can be invoked from outside of the UI thread 8902 * only when this View is attached to a window.</p> 8903 * 8904 * @param action The Runnable that will be executed. 8905 * 8906 * @hide 8907 */ 8908 public void postOnAnimation(Runnable action) { 8909 final AttachInfo attachInfo = mAttachInfo; 8910 if (attachInfo != null) { 8911 attachInfo.mViewRootImpl.mChoreographer.postAnimationCallback(action, null); 8912 } else { 8913 // Assume that post will succeed later 8914 ViewRootImpl.getRunQueue().post(action); 8915 } 8916 } 8917 8918 /** 8919 * <p>Causes the Runnable to execute on the next animation time step, 8920 * after the specified amount of time elapses. 8921 * The runnable will be run on the user interface thread.</p> 8922 * 8923 * <p>This method can be invoked from outside of the UI thread 8924 * only when this View is attached to a window.</p> 8925 * 8926 * @param action The Runnable that will be executed. 8927 * @param delayMillis The delay (in milliseconds) until the Runnable 8928 * will be executed. 8929 * 8930 * @hide 8931 */ 8932 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 8933 final AttachInfo attachInfo = mAttachInfo; 8934 if (attachInfo != null) { 8935 attachInfo.mViewRootImpl.mChoreographer.postAnimationCallbackDelayed( 8936 action, null, delayMillis); 8937 } else { 8938 // Assume that post will succeed later 8939 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 8940 } 8941 } 8942 8943 /** 8944 * <p>Removes the specified Runnable from the message queue.</p> 8945 * 8946 * <p>This method can be invoked from outside of the UI thread 8947 * only when this View is attached to a window.</p> 8948 * 8949 * @param action The Runnable to remove from the message handling queue 8950 * 8951 * @return true if this view could ask the Handler to remove the Runnable, 8952 * false otherwise. When the returned value is true, the Runnable 8953 * may or may not have been actually removed from the message queue 8954 * (for instance, if the Runnable was not in the queue already.) 8955 */ 8956 public boolean removeCallbacks(Runnable action) { 8957 if (action != null) { 8958 final AttachInfo attachInfo = mAttachInfo; 8959 if (attachInfo != null) { 8960 attachInfo.mHandler.removeCallbacks(action); 8961 attachInfo.mViewRootImpl.mChoreographer.removeAnimationCallbacks(action, null); 8962 } else { 8963 // Assume that post will succeed later 8964 ViewRootImpl.getRunQueue().removeCallbacks(action); 8965 } 8966 } 8967 return true; 8968 } 8969 8970 /** 8971 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 8972 * Use this to invalidate the View from a non-UI thread.</p> 8973 * 8974 * <p>This method can be invoked from outside of the UI thread 8975 * only when this View is attached to a window.</p> 8976 * 8977 * @see #invalidate() 8978 */ 8979 public void postInvalidate() { 8980 postInvalidateDelayed(0); 8981 } 8982 8983 /** 8984 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8985 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 8986 * 8987 * <p>This method can be invoked from outside of the UI thread 8988 * only when this View is attached to a window.</p> 8989 * 8990 * @param left The left coordinate of the rectangle to invalidate. 8991 * @param top The top coordinate of the rectangle to invalidate. 8992 * @param right The right coordinate of the rectangle to invalidate. 8993 * @param bottom The bottom coordinate of the rectangle to invalidate. 8994 * 8995 * @see #invalidate(int, int, int, int) 8996 * @see #invalidate(Rect) 8997 */ 8998 public void postInvalidate(int left, int top, int right, int bottom) { 8999 postInvalidateDelayed(0, left, top, right, bottom); 9000 } 9001 9002 /** 9003 * <p>Cause an invalidate to happen on a subsequent cycle through the event 9004 * loop. Waits for the specified amount of time.</p> 9005 * 9006 * <p>This method can be invoked from outside of the UI thread 9007 * only when this View is attached to a window.</p> 9008 * 9009 * @param delayMilliseconds the duration in milliseconds to delay the 9010 * invalidation by 9011 */ 9012 public void postInvalidateDelayed(long delayMilliseconds) { 9013 // We try only with the AttachInfo because there's no point in invalidating 9014 // if we are not attached to our window 9015 final AttachInfo attachInfo = mAttachInfo; 9016 if (attachInfo != null) { 9017 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 9018 } 9019 } 9020 9021 /** 9022 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 9023 * through the event loop. Waits for the specified amount of time.</p> 9024 * 9025 * <p>This method can be invoked from outside of the UI thread 9026 * only when this View is attached to a window.</p> 9027 * 9028 * @param delayMilliseconds the duration in milliseconds to delay the 9029 * invalidation by 9030 * @param left The left coordinate of the rectangle to invalidate. 9031 * @param top The top coordinate of the rectangle to invalidate. 9032 * @param right The right coordinate of the rectangle to invalidate. 9033 * @param bottom The bottom coordinate of the rectangle to invalidate. 9034 */ 9035 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 9036 int right, int bottom) { 9037 9038 // We try only with the AttachInfo because there's no point in invalidating 9039 // if we are not attached to our window 9040 final AttachInfo attachInfo = mAttachInfo; 9041 if (attachInfo != null) { 9042 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 9043 info.target = this; 9044 info.left = left; 9045 info.top = top; 9046 info.right = right; 9047 info.bottom = bottom; 9048 9049 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 9050 } 9051 } 9052 9053 /** 9054 * <p>Cause an invalidate to happen on the next animation time step, typically the 9055 * next display frame.</p> 9056 * 9057 * <p>This method can be invoked from outside of the UI thread 9058 * only when this View is attached to a window.</p> 9059 * 9060 * @hide 9061 */ 9062 public void postInvalidateOnAnimation() { 9063 // We try only with the AttachInfo because there's no point in invalidating 9064 // if we are not attached to our window 9065 final AttachInfo attachInfo = mAttachInfo; 9066 if (attachInfo != null) { 9067 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 9068 } 9069 } 9070 9071 /** 9072 * <p>Cause an invalidate of the specified area to happen on the next animation 9073 * time step, typically the next display frame.</p> 9074 * 9075 * <p>This method can be invoked from outside of the UI thread 9076 * only when this View is attached to a window.</p> 9077 * 9078 * @param left The left coordinate of the rectangle to invalidate. 9079 * @param top The top coordinate of the rectangle to invalidate. 9080 * @param right The right coordinate of the rectangle to invalidate. 9081 * @param bottom The bottom coordinate of the rectangle to invalidate. 9082 * 9083 * @hide 9084 */ 9085 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 9086 // We try only with the AttachInfo because there's no point in invalidating 9087 // if we are not attached to our window 9088 final AttachInfo attachInfo = mAttachInfo; 9089 if (attachInfo != null) { 9090 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 9091 info.target = this; 9092 info.left = left; 9093 info.top = top; 9094 info.right = right; 9095 info.bottom = bottom; 9096 9097 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 9098 } 9099 } 9100 9101 /** 9102 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 9103 * This event is sent at most once every 9104 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 9105 */ 9106 private void postSendViewScrolledAccessibilityEventCallback() { 9107 if (mSendViewScrolledAccessibilityEvent == null) { 9108 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 9109 } 9110 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 9111 mSendViewScrolledAccessibilityEvent.mIsPending = true; 9112 postDelayed(mSendViewScrolledAccessibilityEvent, 9113 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 9114 } 9115 } 9116 9117 /** 9118 * Called by a parent to request that a child update its values for mScrollX 9119 * and mScrollY if necessary. This will typically be done if the child is 9120 * animating a scroll using a {@link android.widget.Scroller Scroller} 9121 * object. 9122 */ 9123 public void computeScroll() { 9124 } 9125 9126 /** 9127 * <p>Indicate whether the horizontal edges are faded when the view is 9128 * scrolled horizontally.</p> 9129 * 9130 * @return true if the horizontal edges should are faded on scroll, false 9131 * otherwise 9132 * 9133 * @see #setHorizontalFadingEdgeEnabled(boolean) 9134 * @attr ref android.R.styleable#View_requiresFadingEdge 9135 */ 9136 public boolean isHorizontalFadingEdgeEnabled() { 9137 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 9138 } 9139 9140 /** 9141 * <p>Define whether the horizontal edges should be faded when this view 9142 * is scrolled horizontally.</p> 9143 * 9144 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 9145 * be faded when the view is scrolled 9146 * horizontally 9147 * 9148 * @see #isHorizontalFadingEdgeEnabled() 9149 * @attr ref android.R.styleable#View_requiresFadingEdge 9150 */ 9151 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 9152 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 9153 if (horizontalFadingEdgeEnabled) { 9154 initScrollCache(); 9155 } 9156 9157 mViewFlags ^= FADING_EDGE_HORIZONTAL; 9158 } 9159 } 9160 9161 /** 9162 * <p>Indicate whether the vertical edges are faded when the view is 9163 * scrolled horizontally.</p> 9164 * 9165 * @return true if the vertical edges should are faded on scroll, false 9166 * otherwise 9167 * 9168 * @see #setVerticalFadingEdgeEnabled(boolean) 9169 * @attr ref android.R.styleable#View_requiresFadingEdge 9170 */ 9171 public boolean isVerticalFadingEdgeEnabled() { 9172 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 9173 } 9174 9175 /** 9176 * <p>Define whether the vertical edges should be faded when this view 9177 * is scrolled vertically.</p> 9178 * 9179 * @param verticalFadingEdgeEnabled true if the vertical edges should 9180 * be faded when the view is scrolled 9181 * vertically 9182 * 9183 * @see #isVerticalFadingEdgeEnabled() 9184 * @attr ref android.R.styleable#View_requiresFadingEdge 9185 */ 9186 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 9187 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 9188 if (verticalFadingEdgeEnabled) { 9189 initScrollCache(); 9190 } 9191 9192 mViewFlags ^= FADING_EDGE_VERTICAL; 9193 } 9194 } 9195 9196 /** 9197 * Returns the strength, or intensity, of the top faded edge. The strength is 9198 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 9199 * returns 0.0 or 1.0 but no value in between. 9200 * 9201 * Subclasses should override this method to provide a smoother fade transition 9202 * when scrolling occurs. 9203 * 9204 * @return the intensity of the top fade as a float between 0.0f and 1.0f 9205 */ 9206 protected float getTopFadingEdgeStrength() { 9207 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 9208 } 9209 9210 /** 9211 * Returns the strength, or intensity, of the bottom faded edge. The strength is 9212 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 9213 * returns 0.0 or 1.0 but no value in between. 9214 * 9215 * Subclasses should override this method to provide a smoother fade transition 9216 * when scrolling occurs. 9217 * 9218 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 9219 */ 9220 protected float getBottomFadingEdgeStrength() { 9221 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 9222 computeVerticalScrollRange() ? 1.0f : 0.0f; 9223 } 9224 9225 /** 9226 * Returns the strength, or intensity, of the left faded edge. The strength is 9227 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 9228 * returns 0.0 or 1.0 but no value in between. 9229 * 9230 * Subclasses should override this method to provide a smoother fade transition 9231 * when scrolling occurs. 9232 * 9233 * @return the intensity of the left fade as a float between 0.0f and 1.0f 9234 */ 9235 protected float getLeftFadingEdgeStrength() { 9236 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 9237 } 9238 9239 /** 9240 * Returns the strength, or intensity, of the right faded edge. The strength is 9241 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 9242 * returns 0.0 or 1.0 but no value in between. 9243 * 9244 * Subclasses should override this method to provide a smoother fade transition 9245 * when scrolling occurs. 9246 * 9247 * @return the intensity of the right fade as a float between 0.0f and 1.0f 9248 */ 9249 protected float getRightFadingEdgeStrength() { 9250 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 9251 computeHorizontalScrollRange() ? 1.0f : 0.0f; 9252 } 9253 9254 /** 9255 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 9256 * scrollbar is not drawn by default.</p> 9257 * 9258 * @return true if the horizontal scrollbar should be painted, false 9259 * otherwise 9260 * 9261 * @see #setHorizontalScrollBarEnabled(boolean) 9262 */ 9263 public boolean isHorizontalScrollBarEnabled() { 9264 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9265 } 9266 9267 /** 9268 * <p>Define whether the horizontal scrollbar should be drawn or not. The 9269 * scrollbar is not drawn by default.</p> 9270 * 9271 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 9272 * be painted 9273 * 9274 * @see #isHorizontalScrollBarEnabled() 9275 */ 9276 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 9277 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 9278 mViewFlags ^= SCROLLBARS_HORIZONTAL; 9279 computeOpaqueFlags(); 9280 resolvePadding(); 9281 } 9282 } 9283 9284 /** 9285 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 9286 * scrollbar is not drawn by default.</p> 9287 * 9288 * @return true if the vertical scrollbar should be painted, false 9289 * otherwise 9290 * 9291 * @see #setVerticalScrollBarEnabled(boolean) 9292 */ 9293 public boolean isVerticalScrollBarEnabled() { 9294 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 9295 } 9296 9297 /** 9298 * <p>Define whether the vertical scrollbar should be drawn or not. The 9299 * scrollbar is not drawn by default.</p> 9300 * 9301 * @param verticalScrollBarEnabled true if the vertical scrollbar should 9302 * be painted 9303 * 9304 * @see #isVerticalScrollBarEnabled() 9305 */ 9306 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 9307 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 9308 mViewFlags ^= SCROLLBARS_VERTICAL; 9309 computeOpaqueFlags(); 9310 resolvePadding(); 9311 } 9312 } 9313 9314 /** 9315 * @hide 9316 */ 9317 protected void recomputePadding() { 9318 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 9319 } 9320 9321 /** 9322 * Define whether scrollbars will fade when the view is not scrolling. 9323 * 9324 * @param fadeScrollbars wheter to enable fading 9325 * 9326 */ 9327 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 9328 initScrollCache(); 9329 final ScrollabilityCache scrollabilityCache = mScrollCache; 9330 scrollabilityCache.fadeScrollBars = fadeScrollbars; 9331 if (fadeScrollbars) { 9332 scrollabilityCache.state = ScrollabilityCache.OFF; 9333 } else { 9334 scrollabilityCache.state = ScrollabilityCache.ON; 9335 } 9336 } 9337 9338 /** 9339 * 9340 * Returns true if scrollbars will fade when this view is not scrolling 9341 * 9342 * @return true if scrollbar fading is enabled 9343 */ 9344 public boolean isScrollbarFadingEnabled() { 9345 return mScrollCache != null && mScrollCache.fadeScrollBars; 9346 } 9347 9348 /** 9349 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 9350 * inset. When inset, they add to the padding of the view. And the scrollbars 9351 * can be drawn inside the padding area or on the edge of the view. For example, 9352 * if a view has a background drawable and you want to draw the scrollbars 9353 * inside the padding specified by the drawable, you can use 9354 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 9355 * appear at the edge of the view, ignoring the padding, then you can use 9356 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 9357 * @param style the style of the scrollbars. Should be one of 9358 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 9359 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 9360 * @see #SCROLLBARS_INSIDE_OVERLAY 9361 * @see #SCROLLBARS_INSIDE_INSET 9362 * @see #SCROLLBARS_OUTSIDE_OVERLAY 9363 * @see #SCROLLBARS_OUTSIDE_INSET 9364 */ 9365 public void setScrollBarStyle(int style) { 9366 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 9367 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 9368 computeOpaqueFlags(); 9369 resolvePadding(); 9370 } 9371 } 9372 9373 /** 9374 * <p>Returns the current scrollbar style.</p> 9375 * @return the current scrollbar style 9376 * @see #SCROLLBARS_INSIDE_OVERLAY 9377 * @see #SCROLLBARS_INSIDE_INSET 9378 * @see #SCROLLBARS_OUTSIDE_OVERLAY 9379 * @see #SCROLLBARS_OUTSIDE_INSET 9380 */ 9381 @ViewDebug.ExportedProperty(mapping = { 9382 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 9383 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 9384 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 9385 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 9386 }) 9387 public int getScrollBarStyle() { 9388 return mViewFlags & SCROLLBARS_STYLE_MASK; 9389 } 9390 9391 /** 9392 * <p>Compute the horizontal range that the horizontal scrollbar 9393 * represents.</p> 9394 * 9395 * <p>The range is expressed in arbitrary units that must be the same as the 9396 * units used by {@link #computeHorizontalScrollExtent()} and 9397 * {@link #computeHorizontalScrollOffset()}.</p> 9398 * 9399 * <p>The default range is the drawing width of this view.</p> 9400 * 9401 * @return the total horizontal range represented by the horizontal 9402 * scrollbar 9403 * 9404 * @see #computeHorizontalScrollExtent() 9405 * @see #computeHorizontalScrollOffset() 9406 * @see android.widget.ScrollBarDrawable 9407 */ 9408 protected int computeHorizontalScrollRange() { 9409 return getWidth(); 9410 } 9411 9412 /** 9413 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 9414 * within the horizontal range. This value is used to compute the position 9415 * of the thumb within the scrollbar's track.</p> 9416 * 9417 * <p>The range is expressed in arbitrary units that must be the same as the 9418 * units used by {@link #computeHorizontalScrollRange()} and 9419 * {@link #computeHorizontalScrollExtent()}.</p> 9420 * 9421 * <p>The default offset is the scroll offset of this view.</p> 9422 * 9423 * @return the horizontal offset of the scrollbar's thumb 9424 * 9425 * @see #computeHorizontalScrollRange() 9426 * @see #computeHorizontalScrollExtent() 9427 * @see android.widget.ScrollBarDrawable 9428 */ 9429 protected int computeHorizontalScrollOffset() { 9430 return mScrollX; 9431 } 9432 9433 /** 9434 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 9435 * within the horizontal range. This value is used to compute the length 9436 * of the thumb within the scrollbar's track.</p> 9437 * 9438 * <p>The range is expressed in arbitrary units that must be the same as the 9439 * units used by {@link #computeHorizontalScrollRange()} and 9440 * {@link #computeHorizontalScrollOffset()}.</p> 9441 * 9442 * <p>The default extent is the drawing width of this view.</p> 9443 * 9444 * @return the horizontal extent of the scrollbar's thumb 9445 * 9446 * @see #computeHorizontalScrollRange() 9447 * @see #computeHorizontalScrollOffset() 9448 * @see android.widget.ScrollBarDrawable 9449 */ 9450 protected int computeHorizontalScrollExtent() { 9451 return getWidth(); 9452 } 9453 9454 /** 9455 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 9456 * 9457 * <p>The range is expressed in arbitrary units that must be the same as the 9458 * units used by {@link #computeVerticalScrollExtent()} and 9459 * {@link #computeVerticalScrollOffset()}.</p> 9460 * 9461 * @return the total vertical range represented by the vertical scrollbar 9462 * 9463 * <p>The default range is the drawing height of this view.</p> 9464 * 9465 * @see #computeVerticalScrollExtent() 9466 * @see #computeVerticalScrollOffset() 9467 * @see android.widget.ScrollBarDrawable 9468 */ 9469 protected int computeVerticalScrollRange() { 9470 return getHeight(); 9471 } 9472 9473 /** 9474 * <p>Compute the vertical offset of the vertical scrollbar's thumb 9475 * within the horizontal range. This value is used to compute the position 9476 * of the thumb within the scrollbar's track.</p> 9477 * 9478 * <p>The range is expressed in arbitrary units that must be the same as the 9479 * units used by {@link #computeVerticalScrollRange()} and 9480 * {@link #computeVerticalScrollExtent()}.</p> 9481 * 9482 * <p>The default offset is the scroll offset of this view.</p> 9483 * 9484 * @return the vertical offset of the scrollbar's thumb 9485 * 9486 * @see #computeVerticalScrollRange() 9487 * @see #computeVerticalScrollExtent() 9488 * @see android.widget.ScrollBarDrawable 9489 */ 9490 protected int computeVerticalScrollOffset() { 9491 return mScrollY; 9492 } 9493 9494 /** 9495 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 9496 * within the vertical range. This value is used to compute the length 9497 * of the thumb within the scrollbar's track.</p> 9498 * 9499 * <p>The range is expressed in arbitrary units that must be the same as the 9500 * units used by {@link #computeVerticalScrollRange()} and 9501 * {@link #computeVerticalScrollOffset()}.</p> 9502 * 9503 * <p>The default extent is the drawing height of this view.</p> 9504 * 9505 * @return the vertical extent of the scrollbar's thumb 9506 * 9507 * @see #computeVerticalScrollRange() 9508 * @see #computeVerticalScrollOffset() 9509 * @see android.widget.ScrollBarDrawable 9510 */ 9511 protected int computeVerticalScrollExtent() { 9512 return getHeight(); 9513 } 9514 9515 /** 9516 * Check if this view can be scrolled horizontally in a certain direction. 9517 * 9518 * @param direction Negative to check scrolling left, positive to check scrolling right. 9519 * @return true if this view can be scrolled in the specified direction, false otherwise. 9520 */ 9521 public boolean canScrollHorizontally(int direction) { 9522 final int offset = computeHorizontalScrollOffset(); 9523 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 9524 if (range == 0) return false; 9525 if (direction < 0) { 9526 return offset > 0; 9527 } else { 9528 return offset < range - 1; 9529 } 9530 } 9531 9532 /** 9533 * Check if this view can be scrolled vertically in a certain direction. 9534 * 9535 * @param direction Negative to check scrolling up, positive to check scrolling down. 9536 * @return true if this view can be scrolled in the specified direction, false otherwise. 9537 */ 9538 public boolean canScrollVertically(int direction) { 9539 final int offset = computeVerticalScrollOffset(); 9540 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 9541 if (range == 0) return false; 9542 if (direction < 0) { 9543 return offset > 0; 9544 } else { 9545 return offset < range - 1; 9546 } 9547 } 9548 9549 /** 9550 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 9551 * scrollbars are painted only if they have been awakened first.</p> 9552 * 9553 * @param canvas the canvas on which to draw the scrollbars 9554 * 9555 * @see #awakenScrollBars(int) 9556 */ 9557 protected final void onDrawScrollBars(Canvas canvas) { 9558 // scrollbars are drawn only when the animation is running 9559 final ScrollabilityCache cache = mScrollCache; 9560 if (cache != null) { 9561 9562 int state = cache.state; 9563 9564 if (state == ScrollabilityCache.OFF) { 9565 return; 9566 } 9567 9568 boolean invalidate = false; 9569 9570 if (state == ScrollabilityCache.FADING) { 9571 // We're fading -- get our fade interpolation 9572 if (cache.interpolatorValues == null) { 9573 cache.interpolatorValues = new float[1]; 9574 } 9575 9576 float[] values = cache.interpolatorValues; 9577 9578 // Stops the animation if we're done 9579 if (cache.scrollBarInterpolator.timeToValues(values) == 9580 Interpolator.Result.FREEZE_END) { 9581 cache.state = ScrollabilityCache.OFF; 9582 } else { 9583 cache.scrollBar.setAlpha(Math.round(values[0])); 9584 } 9585 9586 // This will make the scroll bars inval themselves after 9587 // drawing. We only want this when we're fading so that 9588 // we prevent excessive redraws 9589 invalidate = true; 9590 } else { 9591 // We're just on -- but we may have been fading before so 9592 // reset alpha 9593 cache.scrollBar.setAlpha(255); 9594 } 9595 9596 9597 final int viewFlags = mViewFlags; 9598 9599 final boolean drawHorizontalScrollBar = 9600 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9601 final boolean drawVerticalScrollBar = 9602 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 9603 && !isVerticalScrollBarHidden(); 9604 9605 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 9606 final int width = mRight - mLeft; 9607 final int height = mBottom - mTop; 9608 9609 final ScrollBarDrawable scrollBar = cache.scrollBar; 9610 9611 final int scrollX = mScrollX; 9612 final int scrollY = mScrollY; 9613 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 9614 9615 int left, top, right, bottom; 9616 9617 if (drawHorizontalScrollBar) { 9618 int size = scrollBar.getSize(false); 9619 if (size <= 0) { 9620 size = cache.scrollBarSize; 9621 } 9622 9623 scrollBar.setParameters(computeHorizontalScrollRange(), 9624 computeHorizontalScrollOffset(), 9625 computeHorizontalScrollExtent(), false); 9626 final int verticalScrollBarGap = drawVerticalScrollBar ? 9627 getVerticalScrollbarWidth() : 0; 9628 top = scrollY + height - size - (mUserPaddingBottom & inside); 9629 left = scrollX + (mPaddingLeft & inside); 9630 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 9631 bottom = top + size; 9632 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 9633 if (invalidate) { 9634 invalidate(left, top, right, bottom); 9635 } 9636 } 9637 9638 if (drawVerticalScrollBar) { 9639 int size = scrollBar.getSize(true); 9640 if (size <= 0) { 9641 size = cache.scrollBarSize; 9642 } 9643 9644 scrollBar.setParameters(computeVerticalScrollRange(), 9645 computeVerticalScrollOffset(), 9646 computeVerticalScrollExtent(), true); 9647 switch (mVerticalScrollbarPosition) { 9648 default: 9649 case SCROLLBAR_POSITION_DEFAULT: 9650 case SCROLLBAR_POSITION_RIGHT: 9651 left = scrollX + width - size - (mUserPaddingRight & inside); 9652 break; 9653 case SCROLLBAR_POSITION_LEFT: 9654 left = scrollX + (mUserPaddingLeft & inside); 9655 break; 9656 } 9657 top = scrollY + (mPaddingTop & inside); 9658 right = left + size; 9659 bottom = scrollY + height - (mUserPaddingBottom & inside); 9660 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 9661 if (invalidate) { 9662 invalidate(left, top, right, bottom); 9663 } 9664 } 9665 } 9666 } 9667 } 9668 9669 /** 9670 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 9671 * FastScroller is visible. 9672 * @return whether to temporarily hide the vertical scrollbar 9673 * @hide 9674 */ 9675 protected boolean isVerticalScrollBarHidden() { 9676 return false; 9677 } 9678 9679 /** 9680 * <p>Draw the horizontal scrollbar if 9681 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 9682 * 9683 * @param canvas the canvas on which to draw the scrollbar 9684 * @param scrollBar the scrollbar's drawable 9685 * 9686 * @see #isHorizontalScrollBarEnabled() 9687 * @see #computeHorizontalScrollRange() 9688 * @see #computeHorizontalScrollExtent() 9689 * @see #computeHorizontalScrollOffset() 9690 * @see android.widget.ScrollBarDrawable 9691 * @hide 9692 */ 9693 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 9694 int l, int t, int r, int b) { 9695 scrollBar.setBounds(l, t, r, b); 9696 scrollBar.draw(canvas); 9697 } 9698 9699 /** 9700 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 9701 * returns true.</p> 9702 * 9703 * @param canvas the canvas on which to draw the scrollbar 9704 * @param scrollBar the scrollbar's drawable 9705 * 9706 * @see #isVerticalScrollBarEnabled() 9707 * @see #computeVerticalScrollRange() 9708 * @see #computeVerticalScrollExtent() 9709 * @see #computeVerticalScrollOffset() 9710 * @see android.widget.ScrollBarDrawable 9711 * @hide 9712 */ 9713 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 9714 int l, int t, int r, int b) { 9715 scrollBar.setBounds(l, t, r, b); 9716 scrollBar.draw(canvas); 9717 } 9718 9719 /** 9720 * Implement this to do your drawing. 9721 * 9722 * @param canvas the canvas on which the background will be drawn 9723 */ 9724 protected void onDraw(Canvas canvas) { 9725 } 9726 9727 /* 9728 * Caller is responsible for calling requestLayout if necessary. 9729 * (This allows addViewInLayout to not request a new layout.) 9730 */ 9731 void assignParent(ViewParent parent) { 9732 if (mParent == null) { 9733 mParent = parent; 9734 } else if (parent == null) { 9735 mParent = null; 9736 } else { 9737 throw new RuntimeException("view " + this + " being added, but" 9738 + " it already has a parent"); 9739 } 9740 } 9741 9742 /** 9743 * This is called when the view is attached to a window. At this point it 9744 * has a Surface and will start drawing. Note that this function is 9745 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 9746 * however it may be called any time before the first onDraw -- including 9747 * before or after {@link #onMeasure(int, int)}. 9748 * 9749 * @see #onDetachedFromWindow() 9750 */ 9751 protected void onAttachedToWindow() { 9752 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 9753 mParent.requestTransparentRegion(this); 9754 } 9755 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 9756 initialAwakenScrollBars(); 9757 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 9758 } 9759 jumpDrawablesToCurrentState(); 9760 // Order is important here: LayoutDirection MUST be resolved before Padding 9761 // and TextDirection 9762 resolveLayoutDirectionIfNeeded(); 9763 resolvePadding(); 9764 resolveTextDirection(); 9765 if (isFocused()) { 9766 InputMethodManager imm = InputMethodManager.peekInstance(); 9767 imm.focusIn(this); 9768 } 9769 } 9770 9771 /** 9772 * @see #onScreenStateChanged(int) 9773 */ 9774 void dispatchScreenStateChanged(int screenState) { 9775 onScreenStateChanged(screenState); 9776 } 9777 9778 /** 9779 * This method is called whenever the state of the screen this view is 9780 * attached to changes. A state change will usually occurs when the screen 9781 * turns on or off (whether it happens automatically or the user does it 9782 * manually.) 9783 * 9784 * @param screenState The new state of the screen. Can be either 9785 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 9786 */ 9787 public void onScreenStateChanged(int screenState) { 9788 } 9789 9790 /** 9791 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 9792 * that the parent directionality can and will be resolved before its children. 9793 */ 9794 private void resolveLayoutDirectionIfNeeded() { 9795 // Do not resolve if it is not needed 9796 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) == LAYOUT_DIRECTION_RESOLVED) return; 9797 9798 // Clear any previous layout direction resolution 9799 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_RTL; 9800 9801 // Set resolved depending on layout direction 9802 switch (getLayoutDirection()) { 9803 case LAYOUT_DIRECTION_INHERIT: 9804 // We cannot do the resolution if there is no parent 9805 if (mParent == null) return; 9806 9807 // If this is root view, no need to look at parent's layout dir. 9808 if (mParent instanceof ViewGroup) { 9809 ViewGroup viewGroup = ((ViewGroup) mParent); 9810 9811 // Check if the parent view group can resolve 9812 if (! viewGroup.canResolveLayoutDirection()) { 9813 return; 9814 } 9815 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 9816 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9817 } 9818 } 9819 break; 9820 case LAYOUT_DIRECTION_RTL: 9821 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9822 break; 9823 case LAYOUT_DIRECTION_LOCALE: 9824 if(isLayoutDirectionRtl(Locale.getDefault())) { 9825 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9826 } 9827 break; 9828 default: 9829 // Nothing to do, LTR by default 9830 } 9831 9832 // Set to resolved 9833 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 9834 onResolvedLayoutDirectionChanged(); 9835 // Resolve padding 9836 resolvePadding(); 9837 } 9838 9839 /** 9840 * Called when layout direction has been resolved. 9841 * 9842 * The default implementation does nothing. 9843 */ 9844 public void onResolvedLayoutDirectionChanged() { 9845 } 9846 9847 /** 9848 * Resolve padding depending on layout direction. 9849 */ 9850 public void resolvePadding() { 9851 // If the user specified the absolute padding (either with android:padding or 9852 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 9853 // use the default padding or the padding from the background drawable 9854 // (stored at this point in mPadding*) 9855 int resolvedLayoutDirection = getResolvedLayoutDirection(); 9856 switch (resolvedLayoutDirection) { 9857 case LAYOUT_DIRECTION_RTL: 9858 // Start user padding override Right user padding. Otherwise, if Right user 9859 // padding is not defined, use the default Right padding. If Right user padding 9860 // is defined, just use it. 9861 if (mUserPaddingStart >= 0) { 9862 mUserPaddingRight = mUserPaddingStart; 9863 } else if (mUserPaddingRight < 0) { 9864 mUserPaddingRight = mPaddingRight; 9865 } 9866 if (mUserPaddingEnd >= 0) { 9867 mUserPaddingLeft = mUserPaddingEnd; 9868 } else if (mUserPaddingLeft < 0) { 9869 mUserPaddingLeft = mPaddingLeft; 9870 } 9871 break; 9872 case LAYOUT_DIRECTION_LTR: 9873 default: 9874 // Start user padding override Left user padding. Otherwise, if Left user 9875 // padding is not defined, use the default left padding. If Left user padding 9876 // is defined, just use it. 9877 if (mUserPaddingStart >= 0) { 9878 mUserPaddingLeft = mUserPaddingStart; 9879 } else if (mUserPaddingLeft < 0) { 9880 mUserPaddingLeft = mPaddingLeft; 9881 } 9882 if (mUserPaddingEnd >= 0) { 9883 mUserPaddingRight = mUserPaddingEnd; 9884 } else if (mUserPaddingRight < 0) { 9885 mUserPaddingRight = mPaddingRight; 9886 } 9887 } 9888 9889 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 9890 9891 if(isPaddingRelative()) { 9892 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 9893 } else { 9894 recomputePadding(); 9895 } 9896 onPaddingChanged(resolvedLayoutDirection); 9897 } 9898 9899 /** 9900 * Resolve padding depending on the layout direction. Subclasses that care about 9901 * padding resolution should override this method. The default implementation does 9902 * nothing. 9903 * 9904 * @param layoutDirection the direction of the layout 9905 * 9906 * @see {@link #LAYOUT_DIRECTION_LTR} 9907 * @see {@link #LAYOUT_DIRECTION_RTL} 9908 */ 9909 public void onPaddingChanged(int layoutDirection) { 9910 } 9911 9912 /** 9913 * Check if layout direction resolution can be done. 9914 * 9915 * @return true if layout direction resolution can be done otherwise return false. 9916 */ 9917 public boolean canResolveLayoutDirection() { 9918 switch (getLayoutDirection()) { 9919 case LAYOUT_DIRECTION_INHERIT: 9920 return (mParent != null); 9921 default: 9922 return true; 9923 } 9924 } 9925 9926 /** 9927 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 9928 * when reset is done. 9929 */ 9930 public void resetResolvedLayoutDirection() { 9931 // Reset the current View resolution 9932 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED; 9933 onResolvedLayoutDirectionReset(); 9934 // Reset also the text direction 9935 resetResolvedTextDirection(); 9936 } 9937 9938 /** 9939 * Called during reset of resolved layout direction. 9940 * 9941 * Subclasses need to override this method to clear cached information that depends on the 9942 * resolved layout direction, or to inform child views that inherit their layout direction. 9943 * 9944 * The default implementation does nothing. 9945 */ 9946 public void onResolvedLayoutDirectionReset() { 9947 } 9948 9949 /** 9950 * Check if a Locale uses an RTL script. 9951 * 9952 * @param locale Locale to check 9953 * @return true if the Locale uses an RTL script. 9954 */ 9955 protected static boolean isLayoutDirectionRtl(Locale locale) { 9956 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 9957 } 9958 9959 /** 9960 * This is called when the view is detached from a window. At this point it 9961 * no longer has a surface for drawing. 9962 * 9963 * @see #onAttachedToWindow() 9964 */ 9965 protected void onDetachedFromWindow() { 9966 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 9967 9968 removeUnsetPressCallback(); 9969 removeLongPressCallback(); 9970 removePerformClickCallback(); 9971 removeSendViewScrolledAccessibilityEventCallback(); 9972 9973 destroyDrawingCache(); 9974 9975 destroyLayer(); 9976 9977 if (mDisplayList != null) { 9978 mDisplayList.postInvalidate(mAttachInfo.mHandler); 9979 } 9980 9981 if (mAttachInfo != null) { 9982 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 9983 } 9984 9985 mCurrentAnimation = null; 9986 9987 resetResolvedLayoutDirection(); 9988 } 9989 9990 /** 9991 * @return The number of times this view has been attached to a window 9992 */ 9993 protected int getWindowAttachCount() { 9994 return mWindowAttachCount; 9995 } 9996 9997 /** 9998 * Retrieve a unique token identifying the window this view is attached to. 9999 * @return Return the window's token for use in 10000 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 10001 */ 10002 public IBinder getWindowToken() { 10003 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 10004 } 10005 10006 /** 10007 * Retrieve a unique token identifying the top-level "real" window of 10008 * the window that this view is attached to. That is, this is like 10009 * {@link #getWindowToken}, except if the window this view in is a panel 10010 * window (attached to another containing window), then the token of 10011 * the containing window is returned instead. 10012 * 10013 * @return Returns the associated window token, either 10014 * {@link #getWindowToken()} or the containing window's token. 10015 */ 10016 public IBinder getApplicationWindowToken() { 10017 AttachInfo ai = mAttachInfo; 10018 if (ai != null) { 10019 IBinder appWindowToken = ai.mPanelParentWindowToken; 10020 if (appWindowToken == null) { 10021 appWindowToken = ai.mWindowToken; 10022 } 10023 return appWindowToken; 10024 } 10025 return null; 10026 } 10027 10028 /** 10029 * Retrieve private session object this view hierarchy is using to 10030 * communicate with the window manager. 10031 * @return the session object to communicate with the window manager 10032 */ 10033 /*package*/ IWindowSession getWindowSession() { 10034 return mAttachInfo != null ? mAttachInfo.mSession : null; 10035 } 10036 10037 /** 10038 * @param info the {@link android.view.View.AttachInfo} to associated with 10039 * this view 10040 */ 10041 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 10042 //System.out.println("Attached! " + this); 10043 mAttachInfo = info; 10044 mWindowAttachCount++; 10045 // We will need to evaluate the drawable state at least once. 10046 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 10047 if (mFloatingTreeObserver != null) { 10048 info.mTreeObserver.merge(mFloatingTreeObserver); 10049 mFloatingTreeObserver = null; 10050 } 10051 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 10052 mAttachInfo.mScrollContainers.add(this); 10053 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 10054 } 10055 performCollectViewAttributes(visibility); 10056 onAttachedToWindow(); 10057 10058 ListenerInfo li = mListenerInfo; 10059 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 10060 li != null ? li.mOnAttachStateChangeListeners : null; 10061 if (listeners != null && listeners.size() > 0) { 10062 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 10063 // perform the dispatching. The iterator is a safe guard against listeners that 10064 // could mutate the list by calling the various add/remove methods. This prevents 10065 // the array from being modified while we iterate it. 10066 for (OnAttachStateChangeListener listener : listeners) { 10067 listener.onViewAttachedToWindow(this); 10068 } 10069 } 10070 10071 int vis = info.mWindowVisibility; 10072 if (vis != GONE) { 10073 onWindowVisibilityChanged(vis); 10074 } 10075 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 10076 // If nobody has evaluated the drawable state yet, then do it now. 10077 refreshDrawableState(); 10078 } 10079 } 10080 10081 void dispatchDetachedFromWindow() { 10082 AttachInfo info = mAttachInfo; 10083 if (info != null) { 10084 int vis = info.mWindowVisibility; 10085 if (vis != GONE) { 10086 onWindowVisibilityChanged(GONE); 10087 } 10088 } 10089 10090 onDetachedFromWindow(); 10091 10092 ListenerInfo li = mListenerInfo; 10093 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 10094 li != null ? li.mOnAttachStateChangeListeners : null; 10095 if (listeners != null && listeners.size() > 0) { 10096 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 10097 // perform the dispatching. The iterator is a safe guard against listeners that 10098 // could mutate the list by calling the various add/remove methods. This prevents 10099 // the array from being modified while we iterate it. 10100 for (OnAttachStateChangeListener listener : listeners) { 10101 listener.onViewDetachedFromWindow(this); 10102 } 10103 } 10104 10105 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 10106 mAttachInfo.mScrollContainers.remove(this); 10107 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 10108 } 10109 10110 mAttachInfo = null; 10111 } 10112 10113 /** 10114 * Store this view hierarchy's frozen state into the given container. 10115 * 10116 * @param container The SparseArray in which to save the view's state. 10117 * 10118 * @see #restoreHierarchyState(android.util.SparseArray) 10119 * @see #dispatchSaveInstanceState(android.util.SparseArray) 10120 * @see #onSaveInstanceState() 10121 */ 10122 public void saveHierarchyState(SparseArray<Parcelable> container) { 10123 dispatchSaveInstanceState(container); 10124 } 10125 10126 /** 10127 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 10128 * this view and its children. May be overridden to modify how freezing happens to a 10129 * view's children; for example, some views may want to not store state for their children. 10130 * 10131 * @param container The SparseArray in which to save the view's state. 10132 * 10133 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 10134 * @see #saveHierarchyState(android.util.SparseArray) 10135 * @see #onSaveInstanceState() 10136 */ 10137 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 10138 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 10139 mPrivateFlags &= ~SAVE_STATE_CALLED; 10140 Parcelable state = onSaveInstanceState(); 10141 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 10142 throw new IllegalStateException( 10143 "Derived class did not call super.onSaveInstanceState()"); 10144 } 10145 if (state != null) { 10146 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 10147 // + ": " + state); 10148 container.put(mID, state); 10149 } 10150 } 10151 } 10152 10153 /** 10154 * Hook allowing a view to generate a representation of its internal state 10155 * that can later be used to create a new instance with that same state. 10156 * This state should only contain information that is not persistent or can 10157 * not be reconstructed later. For example, you will never store your 10158 * current position on screen because that will be computed again when a 10159 * new instance of the view is placed in its view hierarchy. 10160 * <p> 10161 * Some examples of things you may store here: the current cursor position 10162 * in a text view (but usually not the text itself since that is stored in a 10163 * content provider or other persistent storage), the currently selected 10164 * item in a list view. 10165 * 10166 * @return Returns a Parcelable object containing the view's current dynamic 10167 * state, or null if there is nothing interesting to save. The 10168 * default implementation returns null. 10169 * @see #onRestoreInstanceState(android.os.Parcelable) 10170 * @see #saveHierarchyState(android.util.SparseArray) 10171 * @see #dispatchSaveInstanceState(android.util.SparseArray) 10172 * @see #setSaveEnabled(boolean) 10173 */ 10174 protected Parcelable onSaveInstanceState() { 10175 mPrivateFlags |= SAVE_STATE_CALLED; 10176 return BaseSavedState.EMPTY_STATE; 10177 } 10178 10179 /** 10180 * Restore this view hierarchy's frozen state from the given container. 10181 * 10182 * @param container The SparseArray which holds previously frozen states. 10183 * 10184 * @see #saveHierarchyState(android.util.SparseArray) 10185 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 10186 * @see #onRestoreInstanceState(android.os.Parcelable) 10187 */ 10188 public void restoreHierarchyState(SparseArray<Parcelable> container) { 10189 dispatchRestoreInstanceState(container); 10190 } 10191 10192 /** 10193 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 10194 * state for this view and its children. May be overridden to modify how restoring 10195 * happens to a view's children; for example, some views may want to not store state 10196 * for their children. 10197 * 10198 * @param container The SparseArray which holds previously saved state. 10199 * 10200 * @see #dispatchSaveInstanceState(android.util.SparseArray) 10201 * @see #restoreHierarchyState(android.util.SparseArray) 10202 * @see #onRestoreInstanceState(android.os.Parcelable) 10203 */ 10204 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 10205 if (mID != NO_ID) { 10206 Parcelable state = container.get(mID); 10207 if (state != null) { 10208 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 10209 // + ": " + state); 10210 mPrivateFlags &= ~SAVE_STATE_CALLED; 10211 onRestoreInstanceState(state); 10212 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 10213 throw new IllegalStateException( 10214 "Derived class did not call super.onRestoreInstanceState()"); 10215 } 10216 } 10217 } 10218 } 10219 10220 /** 10221 * Hook allowing a view to re-apply a representation of its internal state that had previously 10222 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 10223 * null state. 10224 * 10225 * @param state The frozen state that had previously been returned by 10226 * {@link #onSaveInstanceState}. 10227 * 10228 * @see #onSaveInstanceState() 10229 * @see #restoreHierarchyState(android.util.SparseArray) 10230 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 10231 */ 10232 protected void onRestoreInstanceState(Parcelable state) { 10233 mPrivateFlags |= SAVE_STATE_CALLED; 10234 if (state != BaseSavedState.EMPTY_STATE && state != null) { 10235 throw new IllegalArgumentException("Wrong state class, expecting View State but " 10236 + "received " + state.getClass().toString() + " instead. This usually happens " 10237 + "when two views of different type have the same id in the same hierarchy. " 10238 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 10239 + "other views do not use the same id."); 10240 } 10241 } 10242 10243 /** 10244 * <p>Return the time at which the drawing of the view hierarchy started.</p> 10245 * 10246 * @return the drawing start time in milliseconds 10247 */ 10248 public long getDrawingTime() { 10249 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 10250 } 10251 10252 /** 10253 * <p>Enables or disables the duplication of the parent's state into this view. When 10254 * duplication is enabled, this view gets its drawable state from its parent rather 10255 * than from its own internal properties.</p> 10256 * 10257 * <p>Note: in the current implementation, setting this property to true after the 10258 * view was added to a ViewGroup might have no effect at all. This property should 10259 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 10260 * 10261 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 10262 * property is enabled, an exception will be thrown.</p> 10263 * 10264 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 10265 * parent, these states should not be affected by this method.</p> 10266 * 10267 * @param enabled True to enable duplication of the parent's drawable state, false 10268 * to disable it. 10269 * 10270 * @see #getDrawableState() 10271 * @see #isDuplicateParentStateEnabled() 10272 */ 10273 public void setDuplicateParentStateEnabled(boolean enabled) { 10274 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 10275 } 10276 10277 /** 10278 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 10279 * 10280 * @return True if this view's drawable state is duplicated from the parent, 10281 * false otherwise 10282 * 10283 * @see #getDrawableState() 10284 * @see #setDuplicateParentStateEnabled(boolean) 10285 */ 10286 public boolean isDuplicateParentStateEnabled() { 10287 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 10288 } 10289 10290 /** 10291 * <p>Specifies the type of layer backing this view. The layer can be 10292 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 10293 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 10294 * 10295 * <p>A layer is associated with an optional {@link android.graphics.Paint} 10296 * instance that controls how the layer is composed on screen. The following 10297 * properties of the paint are taken into account when composing the layer:</p> 10298 * <ul> 10299 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 10300 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 10301 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 10302 * </ul> 10303 * 10304 * <p>If this view has an alpha value set to < 1.0 by calling 10305 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 10306 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 10307 * equivalent to setting a hardware layer on this view and providing a paint with 10308 * the desired alpha value.<p> 10309 * 10310 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 10311 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 10312 * for more information on when and how to use layers.</p> 10313 * 10314 * @param layerType The ype of layer to use with this view, must be one of 10315 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 10316 * {@link #LAYER_TYPE_HARDWARE} 10317 * @param paint The paint used to compose the layer. This argument is optional 10318 * and can be null. It is ignored when the layer type is 10319 * {@link #LAYER_TYPE_NONE} 10320 * 10321 * @see #getLayerType() 10322 * @see #LAYER_TYPE_NONE 10323 * @see #LAYER_TYPE_SOFTWARE 10324 * @see #LAYER_TYPE_HARDWARE 10325 * @see #setAlpha(float) 10326 * 10327 * @attr ref android.R.styleable#View_layerType 10328 */ 10329 public void setLayerType(int layerType, Paint paint) { 10330 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 10331 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 10332 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 10333 } 10334 10335 if (layerType == mLayerType) { 10336 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 10337 mLayerPaint = paint == null ? new Paint() : paint; 10338 invalidateParentCaches(); 10339 invalidate(true); 10340 } 10341 return; 10342 } 10343 10344 // Destroy any previous software drawing cache if needed 10345 switch (mLayerType) { 10346 case LAYER_TYPE_HARDWARE: 10347 destroyLayer(); 10348 // fall through - non-accelerated views may use software layer mechanism instead 10349 case LAYER_TYPE_SOFTWARE: 10350 destroyDrawingCache(); 10351 break; 10352 default: 10353 break; 10354 } 10355 10356 mLayerType = layerType; 10357 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 10358 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 10359 mLocalDirtyRect = layerDisabled ? null : new Rect(); 10360 10361 invalidateParentCaches(); 10362 invalidate(true); 10363 } 10364 10365 /** 10366 * Indicates whether this view has a static layer. A view with layer type 10367 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 10368 * dynamic. 10369 */ 10370 boolean hasStaticLayer() { 10371 return true; 10372 } 10373 10374 /** 10375 * Indicates what type of layer is currently associated with this view. By default 10376 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 10377 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 10378 * for more information on the different types of layers. 10379 * 10380 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 10381 * {@link #LAYER_TYPE_HARDWARE} 10382 * 10383 * @see #setLayerType(int, android.graphics.Paint) 10384 * @see #buildLayer() 10385 * @see #LAYER_TYPE_NONE 10386 * @see #LAYER_TYPE_SOFTWARE 10387 * @see #LAYER_TYPE_HARDWARE 10388 */ 10389 public int getLayerType() { 10390 return mLayerType; 10391 } 10392 10393 /** 10394 * Forces this view's layer to be created and this view to be rendered 10395 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 10396 * invoking this method will have no effect. 10397 * 10398 * This method can for instance be used to render a view into its layer before 10399 * starting an animation. If this view is complex, rendering into the layer 10400 * before starting the animation will avoid skipping frames. 10401 * 10402 * @throws IllegalStateException If this view is not attached to a window 10403 * 10404 * @see #setLayerType(int, android.graphics.Paint) 10405 */ 10406 public void buildLayer() { 10407 if (mLayerType == LAYER_TYPE_NONE) return; 10408 10409 if (mAttachInfo == null) { 10410 throw new IllegalStateException("This view must be attached to a window first"); 10411 } 10412 10413 switch (mLayerType) { 10414 case LAYER_TYPE_HARDWARE: 10415 if (mAttachInfo.mHardwareRenderer != null && 10416 mAttachInfo.mHardwareRenderer.isEnabled() && 10417 mAttachInfo.mHardwareRenderer.validate()) { 10418 getHardwareLayer(); 10419 } 10420 break; 10421 case LAYER_TYPE_SOFTWARE: 10422 buildDrawingCache(true); 10423 break; 10424 } 10425 } 10426 10427 // Make sure the HardwareRenderer.validate() was invoked before calling this method 10428 void flushLayer() { 10429 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 10430 mHardwareLayer.flush(); 10431 } 10432 } 10433 10434 /** 10435 * <p>Returns a hardware layer that can be used to draw this view again 10436 * without executing its draw method.</p> 10437 * 10438 * @return A HardwareLayer ready to render, or null if an error occurred. 10439 */ 10440 HardwareLayer getHardwareLayer() { 10441 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 10442 !mAttachInfo.mHardwareRenderer.isEnabled()) { 10443 return null; 10444 } 10445 10446 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 10447 10448 final int width = mRight - mLeft; 10449 final int height = mBottom - mTop; 10450 10451 if (width == 0 || height == 0) { 10452 return null; 10453 } 10454 10455 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 10456 if (mHardwareLayer == null) { 10457 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 10458 width, height, isOpaque()); 10459 mLocalDirtyRect.set(0, 0, width, height); 10460 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 10461 mHardwareLayer.resize(width, height); 10462 mLocalDirtyRect.set(0, 0, width, height); 10463 } 10464 10465 // The layer is not valid if the underlying GPU resources cannot be allocated 10466 if (!mHardwareLayer.isValid()) { 10467 return null; 10468 } 10469 10470 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 10471 mLocalDirtyRect.setEmpty(); 10472 } 10473 10474 return mHardwareLayer; 10475 } 10476 10477 /** 10478 * Destroys this View's hardware layer if possible. 10479 * 10480 * @return True if the layer was destroyed, false otherwise. 10481 * 10482 * @see #setLayerType(int, android.graphics.Paint) 10483 * @see #LAYER_TYPE_HARDWARE 10484 */ 10485 boolean destroyLayer() { 10486 if (mHardwareLayer != null) { 10487 AttachInfo info = mAttachInfo; 10488 if (info != null && info.mHardwareRenderer != null && 10489 info.mHardwareRenderer.isEnabled() && info.mHardwareRenderer.validate()) { 10490 mHardwareLayer.destroy(); 10491 mHardwareLayer = null; 10492 10493 invalidate(true); 10494 invalidateParentCaches(); 10495 } 10496 return true; 10497 } 10498 return false; 10499 } 10500 10501 /** 10502 * Destroys all hardware rendering resources. This method is invoked 10503 * when the system needs to reclaim resources. Upon execution of this 10504 * method, you should free any OpenGL resources created by the view. 10505 * 10506 * Note: you <strong>must</strong> call 10507 * <code>super.destroyHardwareResources()</code> when overriding 10508 * this method. 10509 * 10510 * @hide 10511 */ 10512 protected void destroyHardwareResources() { 10513 destroyLayer(); 10514 } 10515 10516 /** 10517 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 10518 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 10519 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 10520 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 10521 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 10522 * null.</p> 10523 * 10524 * <p>Enabling the drawing cache is similar to 10525 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 10526 * acceleration is turned off. When hardware acceleration is turned on, enabling the 10527 * drawing cache has no effect on rendering because the system uses a different mechanism 10528 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 10529 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 10530 * for information on how to enable software and hardware layers.</p> 10531 * 10532 * <p>This API can be used to manually generate 10533 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 10534 * {@link #getDrawingCache()}.</p> 10535 * 10536 * @param enabled true to enable the drawing cache, false otherwise 10537 * 10538 * @see #isDrawingCacheEnabled() 10539 * @see #getDrawingCache() 10540 * @see #buildDrawingCache() 10541 * @see #setLayerType(int, android.graphics.Paint) 10542 */ 10543 public void setDrawingCacheEnabled(boolean enabled) { 10544 mCachingFailed = false; 10545 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 10546 } 10547 10548 /** 10549 * <p>Indicates whether the drawing cache is enabled for this view.</p> 10550 * 10551 * @return true if the drawing cache is enabled 10552 * 10553 * @see #setDrawingCacheEnabled(boolean) 10554 * @see #getDrawingCache() 10555 */ 10556 @ViewDebug.ExportedProperty(category = "drawing") 10557 public boolean isDrawingCacheEnabled() { 10558 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 10559 } 10560 10561 /** 10562 * Debugging utility which recursively outputs the dirty state of a view and its 10563 * descendants. 10564 * 10565 * @hide 10566 */ 10567 @SuppressWarnings({"UnusedDeclaration"}) 10568 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 10569 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 10570 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 10571 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 10572 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 10573 if (clear) { 10574 mPrivateFlags &= clearMask; 10575 } 10576 if (this instanceof ViewGroup) { 10577 ViewGroup parent = (ViewGroup) this; 10578 final int count = parent.getChildCount(); 10579 for (int i = 0; i < count; i++) { 10580 final View child = parent.getChildAt(i); 10581 child.outputDirtyFlags(indent + " ", clear, clearMask); 10582 } 10583 } 10584 } 10585 10586 /** 10587 * This method is used by ViewGroup to cause its children to restore or recreate their 10588 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 10589 * to recreate its own display list, which would happen if it went through the normal 10590 * draw/dispatchDraw mechanisms. 10591 * 10592 * @hide 10593 */ 10594 protected void dispatchGetDisplayList() {} 10595 10596 /** 10597 * A view that is not attached or hardware accelerated cannot create a display list. 10598 * This method checks these conditions and returns the appropriate result. 10599 * 10600 * @return true if view has the ability to create a display list, false otherwise. 10601 * 10602 * @hide 10603 */ 10604 public boolean canHaveDisplayList() { 10605 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 10606 } 10607 10608 /** 10609 * @return The HardwareRenderer associated with that view or null if hardware rendering 10610 * is not supported or this this has not been attached to a window. 10611 * 10612 * @hide 10613 */ 10614 public HardwareRenderer getHardwareRenderer() { 10615 if (mAttachInfo != null) { 10616 return mAttachInfo.mHardwareRenderer; 10617 } 10618 return null; 10619 } 10620 10621 /** 10622 * Returns a DisplayList. If the incoming displayList is null, one will be created. 10623 * Otherwise, the same display list will be returned (after having been rendered into 10624 * along the way, depending on the invalidation state of the view). 10625 * 10626 * @param displayList The previous version of this displayList, could be null. 10627 * @param isLayer Whether the requester of the display list is a layer. If so, 10628 * the view will avoid creating a layer inside the resulting display list. 10629 * @return A new or reused DisplayList object. 10630 */ 10631 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 10632 if (!canHaveDisplayList()) { 10633 return null; 10634 } 10635 10636 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 10637 displayList == null || !displayList.isValid() || 10638 (!isLayer && mRecreateDisplayList))) { 10639 // Don't need to recreate the display list, just need to tell our 10640 // children to restore/recreate theirs 10641 if (displayList != null && displayList.isValid() && 10642 !isLayer && !mRecreateDisplayList) { 10643 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10644 mPrivateFlags &= ~DIRTY_MASK; 10645 dispatchGetDisplayList(); 10646 10647 return displayList; 10648 } 10649 10650 if (!isLayer) { 10651 // If we got here, we're recreating it. Mark it as such to ensure that 10652 // we copy in child display lists into ours in drawChild() 10653 mRecreateDisplayList = true; 10654 } 10655 if (displayList == null) { 10656 final String name = getClass().getSimpleName(); 10657 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 10658 // If we're creating a new display list, make sure our parent gets invalidated 10659 // since they will need to recreate their display list to account for this 10660 // new child display list. 10661 invalidateParentCaches(); 10662 } 10663 10664 boolean caching = false; 10665 final HardwareCanvas canvas = displayList.start(); 10666 int restoreCount = 0; 10667 int width = mRight - mLeft; 10668 int height = mBottom - mTop; 10669 10670 try { 10671 canvas.setViewport(width, height); 10672 // The dirty rect should always be null for a display list 10673 canvas.onPreDraw(null); 10674 int layerType = ( 10675 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 10676 getLayerType() : LAYER_TYPE_NONE; 10677 if (!isLayer && layerType == LAYER_TYPE_HARDWARE && USE_DISPLAY_LIST_PROPERTIES) { 10678 final HardwareLayer layer = getHardwareLayer(); 10679 if (layer != null && layer.isValid()) { 10680 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 10681 } else { 10682 canvas.saveLayer(0, 0, 10683 mRight - mLeft, mBottom - mTop, mLayerPaint, 10684 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 10685 } 10686 caching = true; 10687 } else { 10688 10689 computeScroll(); 10690 10691 if (!USE_DISPLAY_LIST_PROPERTIES) { 10692 restoreCount = canvas.save(); 10693 } 10694 canvas.translate(-mScrollX, -mScrollY); 10695 if (!isLayer) { 10696 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10697 mPrivateFlags &= ~DIRTY_MASK; 10698 } 10699 10700 // Fast path for layouts with no backgrounds 10701 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10702 dispatchDraw(canvas); 10703 } else { 10704 draw(canvas); 10705 } 10706 } 10707 } finally { 10708 if (USE_DISPLAY_LIST_PROPERTIES) { 10709 canvas.restoreToCount(restoreCount); 10710 } 10711 canvas.onPostDraw(); 10712 10713 displayList.end(); 10714 if (USE_DISPLAY_LIST_PROPERTIES) { 10715 displayList.setCaching(caching); 10716 } 10717 if (isLayer && USE_DISPLAY_LIST_PROPERTIES) { 10718 displayList.setLeftTopRightBottom(0, 0, width, height); 10719 } else { 10720 setDisplayListProperties(displayList); 10721 } 10722 } 10723 } else if (!isLayer) { 10724 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10725 mPrivateFlags &= ~DIRTY_MASK; 10726 } 10727 10728 return displayList; 10729 } 10730 10731 /** 10732 * Get the DisplayList for the HardwareLayer 10733 * 10734 * @param layer The HardwareLayer whose DisplayList we want 10735 * @return A DisplayList fopr the specified HardwareLayer 10736 */ 10737 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 10738 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 10739 layer.setDisplayList(displayList); 10740 return displayList; 10741 } 10742 10743 10744 /** 10745 * <p>Returns a display list that can be used to draw this view again 10746 * without executing its draw method.</p> 10747 * 10748 * @return A DisplayList ready to replay, or null if caching is not enabled. 10749 * 10750 * @hide 10751 */ 10752 public DisplayList getDisplayList() { 10753 mDisplayList = getDisplayList(mDisplayList, false); 10754 return mDisplayList; 10755 } 10756 10757 /** 10758 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 10759 * 10760 * @return A non-scaled bitmap representing this view or null if cache is disabled. 10761 * 10762 * @see #getDrawingCache(boolean) 10763 */ 10764 public Bitmap getDrawingCache() { 10765 return getDrawingCache(false); 10766 } 10767 10768 /** 10769 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 10770 * is null when caching is disabled. If caching is enabled and the cache is not ready, 10771 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 10772 * draw from the cache when the cache is enabled. To benefit from the cache, you must 10773 * request the drawing cache by calling this method and draw it on screen if the 10774 * returned bitmap is not null.</p> 10775 * 10776 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10777 * this method will create a bitmap of the same size as this view. Because this bitmap 10778 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10779 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10780 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10781 * size than the view. This implies that your application must be able to handle this 10782 * size.</p> 10783 * 10784 * @param autoScale Indicates whether the generated bitmap should be scaled based on 10785 * the current density of the screen when the application is in compatibility 10786 * mode. 10787 * 10788 * @return A bitmap representing this view or null if cache is disabled. 10789 * 10790 * @see #setDrawingCacheEnabled(boolean) 10791 * @see #isDrawingCacheEnabled() 10792 * @see #buildDrawingCache(boolean) 10793 * @see #destroyDrawingCache() 10794 */ 10795 public Bitmap getDrawingCache(boolean autoScale) { 10796 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 10797 return null; 10798 } 10799 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 10800 buildDrawingCache(autoScale); 10801 } 10802 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 10803 } 10804 10805 /** 10806 * <p>Frees the resources used by the drawing cache. If you call 10807 * {@link #buildDrawingCache()} manually without calling 10808 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10809 * should cleanup the cache with this method afterwards.</p> 10810 * 10811 * @see #setDrawingCacheEnabled(boolean) 10812 * @see #buildDrawingCache() 10813 * @see #getDrawingCache() 10814 */ 10815 public void destroyDrawingCache() { 10816 if (mDrawingCache != null) { 10817 mDrawingCache.recycle(); 10818 mDrawingCache = null; 10819 } 10820 if (mUnscaledDrawingCache != null) { 10821 mUnscaledDrawingCache.recycle(); 10822 mUnscaledDrawingCache = null; 10823 } 10824 } 10825 10826 /** 10827 * Setting a solid background color for the drawing cache's bitmaps will improve 10828 * performance and memory usage. Note, though that this should only be used if this 10829 * view will always be drawn on top of a solid color. 10830 * 10831 * @param color The background color to use for the drawing cache's bitmap 10832 * 10833 * @see #setDrawingCacheEnabled(boolean) 10834 * @see #buildDrawingCache() 10835 * @see #getDrawingCache() 10836 */ 10837 public void setDrawingCacheBackgroundColor(int color) { 10838 if (color != mDrawingCacheBackgroundColor) { 10839 mDrawingCacheBackgroundColor = color; 10840 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10841 } 10842 } 10843 10844 /** 10845 * @see #setDrawingCacheBackgroundColor(int) 10846 * 10847 * @return The background color to used for the drawing cache's bitmap 10848 */ 10849 public int getDrawingCacheBackgroundColor() { 10850 return mDrawingCacheBackgroundColor; 10851 } 10852 10853 /** 10854 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 10855 * 10856 * @see #buildDrawingCache(boolean) 10857 */ 10858 public void buildDrawingCache() { 10859 buildDrawingCache(false); 10860 } 10861 10862 /** 10863 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 10864 * 10865 * <p>If you call {@link #buildDrawingCache()} manually without calling 10866 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10867 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 10868 * 10869 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10870 * this method will create a bitmap of the same size as this view. Because this bitmap 10871 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10872 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10873 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10874 * size than the view. This implies that your application must be able to handle this 10875 * size.</p> 10876 * 10877 * <p>You should avoid calling this method when hardware acceleration is enabled. If 10878 * you do not need the drawing cache bitmap, calling this method will increase memory 10879 * usage and cause the view to be rendered in software once, thus negatively impacting 10880 * performance.</p> 10881 * 10882 * @see #getDrawingCache() 10883 * @see #destroyDrawingCache() 10884 */ 10885 public void buildDrawingCache(boolean autoScale) { 10886 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 10887 mDrawingCache == null : mUnscaledDrawingCache == null)) { 10888 mCachingFailed = false; 10889 10890 if (ViewDebug.TRACE_HIERARCHY) { 10891 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 10892 } 10893 10894 int width = mRight - mLeft; 10895 int height = mBottom - mTop; 10896 10897 final AttachInfo attachInfo = mAttachInfo; 10898 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 10899 10900 if (autoScale && scalingRequired) { 10901 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 10902 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 10903 } 10904 10905 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 10906 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 10907 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 10908 10909 if (width <= 0 || height <= 0 || 10910 // Projected bitmap size in bytes 10911 (width * height * (opaque && !use32BitCache ? 2 : 4) > 10912 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 10913 destroyDrawingCache(); 10914 mCachingFailed = true; 10915 return; 10916 } 10917 10918 boolean clear = true; 10919 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 10920 10921 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 10922 Bitmap.Config quality; 10923 if (!opaque) { 10924 // Never pick ARGB_4444 because it looks awful 10925 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 10926 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 10927 case DRAWING_CACHE_QUALITY_AUTO: 10928 quality = Bitmap.Config.ARGB_8888; 10929 break; 10930 case DRAWING_CACHE_QUALITY_LOW: 10931 quality = Bitmap.Config.ARGB_8888; 10932 break; 10933 case DRAWING_CACHE_QUALITY_HIGH: 10934 quality = Bitmap.Config.ARGB_8888; 10935 break; 10936 default: 10937 quality = Bitmap.Config.ARGB_8888; 10938 break; 10939 } 10940 } else { 10941 // Optimization for translucent windows 10942 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 10943 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 10944 } 10945 10946 // Try to cleanup memory 10947 if (bitmap != null) bitmap.recycle(); 10948 10949 try { 10950 bitmap = Bitmap.createBitmap(width, height, quality); 10951 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 10952 if (autoScale) { 10953 mDrawingCache = bitmap; 10954 } else { 10955 mUnscaledDrawingCache = bitmap; 10956 } 10957 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 10958 } catch (OutOfMemoryError e) { 10959 // If there is not enough memory to create the bitmap cache, just 10960 // ignore the issue as bitmap caches are not required to draw the 10961 // view hierarchy 10962 if (autoScale) { 10963 mDrawingCache = null; 10964 } else { 10965 mUnscaledDrawingCache = null; 10966 } 10967 mCachingFailed = true; 10968 return; 10969 } 10970 10971 clear = drawingCacheBackgroundColor != 0; 10972 } 10973 10974 Canvas canvas; 10975 if (attachInfo != null) { 10976 canvas = attachInfo.mCanvas; 10977 if (canvas == null) { 10978 canvas = new Canvas(); 10979 } 10980 canvas.setBitmap(bitmap); 10981 // Temporarily clobber the cached Canvas in case one of our children 10982 // is also using a drawing cache. Without this, the children would 10983 // steal the canvas by attaching their own bitmap to it and bad, bad 10984 // thing would happen (invisible views, corrupted drawings, etc.) 10985 attachInfo.mCanvas = null; 10986 } else { 10987 // This case should hopefully never or seldom happen 10988 canvas = new Canvas(bitmap); 10989 } 10990 10991 if (clear) { 10992 bitmap.eraseColor(drawingCacheBackgroundColor); 10993 } 10994 10995 computeScroll(); 10996 final int restoreCount = canvas.save(); 10997 10998 if (autoScale && scalingRequired) { 10999 final float scale = attachInfo.mApplicationScale; 11000 canvas.scale(scale, scale); 11001 } 11002 11003 canvas.translate(-mScrollX, -mScrollY); 11004 11005 mPrivateFlags |= DRAWN; 11006 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 11007 mLayerType != LAYER_TYPE_NONE) { 11008 mPrivateFlags |= DRAWING_CACHE_VALID; 11009 } 11010 11011 // Fast path for layouts with no backgrounds 11012 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 11013 if (ViewDebug.TRACE_HIERARCHY) { 11014 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 11015 } 11016 mPrivateFlags &= ~DIRTY_MASK; 11017 dispatchDraw(canvas); 11018 } else { 11019 draw(canvas); 11020 } 11021 11022 canvas.restoreToCount(restoreCount); 11023 canvas.setBitmap(null); 11024 11025 if (attachInfo != null) { 11026 // Restore the cached Canvas for our siblings 11027 attachInfo.mCanvas = canvas; 11028 } 11029 } 11030 } 11031 11032 /** 11033 * Create a snapshot of the view into a bitmap. We should probably make 11034 * some form of this public, but should think about the API. 11035 */ 11036 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 11037 int width = mRight - mLeft; 11038 int height = mBottom - mTop; 11039 11040 final AttachInfo attachInfo = mAttachInfo; 11041 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 11042 width = (int) ((width * scale) + 0.5f); 11043 height = (int) ((height * scale) + 0.5f); 11044 11045 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 11046 if (bitmap == null) { 11047 throw new OutOfMemoryError(); 11048 } 11049 11050 Resources resources = getResources(); 11051 if (resources != null) { 11052 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 11053 } 11054 11055 Canvas canvas; 11056 if (attachInfo != null) { 11057 canvas = attachInfo.mCanvas; 11058 if (canvas == null) { 11059 canvas = new Canvas(); 11060 } 11061 canvas.setBitmap(bitmap); 11062 // Temporarily clobber the cached Canvas in case one of our children 11063 // is also using a drawing cache. Without this, the children would 11064 // steal the canvas by attaching their own bitmap to it and bad, bad 11065 // things would happen (invisible views, corrupted drawings, etc.) 11066 attachInfo.mCanvas = null; 11067 } else { 11068 // This case should hopefully never or seldom happen 11069 canvas = new Canvas(bitmap); 11070 } 11071 11072 if ((backgroundColor & 0xff000000) != 0) { 11073 bitmap.eraseColor(backgroundColor); 11074 } 11075 11076 computeScroll(); 11077 final int restoreCount = canvas.save(); 11078 canvas.scale(scale, scale); 11079 canvas.translate(-mScrollX, -mScrollY); 11080 11081 // Temporarily remove the dirty mask 11082 int flags = mPrivateFlags; 11083 mPrivateFlags &= ~DIRTY_MASK; 11084 11085 // Fast path for layouts with no backgrounds 11086 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 11087 dispatchDraw(canvas); 11088 } else { 11089 draw(canvas); 11090 } 11091 11092 mPrivateFlags = flags; 11093 11094 canvas.restoreToCount(restoreCount); 11095 canvas.setBitmap(null); 11096 11097 if (attachInfo != null) { 11098 // Restore the cached Canvas for our siblings 11099 attachInfo.mCanvas = canvas; 11100 } 11101 11102 return bitmap; 11103 } 11104 11105 /** 11106 * Indicates whether this View is currently in edit mode. A View is usually 11107 * in edit mode when displayed within a developer tool. For instance, if 11108 * this View is being drawn by a visual user interface builder, this method 11109 * should return true. 11110 * 11111 * Subclasses should check the return value of this method to provide 11112 * different behaviors if their normal behavior might interfere with the 11113 * host environment. For instance: the class spawns a thread in its 11114 * constructor, the drawing code relies on device-specific features, etc. 11115 * 11116 * This method is usually checked in the drawing code of custom widgets. 11117 * 11118 * @return True if this View is in edit mode, false otherwise. 11119 */ 11120 public boolean isInEditMode() { 11121 return false; 11122 } 11123 11124 /** 11125 * If the View draws content inside its padding and enables fading edges, 11126 * it needs to support padding offsets. Padding offsets are added to the 11127 * fading edges to extend the length of the fade so that it covers pixels 11128 * drawn inside the padding. 11129 * 11130 * Subclasses of this class should override this method if they need 11131 * to draw content inside the padding. 11132 * 11133 * @return True if padding offset must be applied, false otherwise. 11134 * 11135 * @see #getLeftPaddingOffset() 11136 * @see #getRightPaddingOffset() 11137 * @see #getTopPaddingOffset() 11138 * @see #getBottomPaddingOffset() 11139 * 11140 * @since CURRENT 11141 */ 11142 protected boolean isPaddingOffsetRequired() { 11143 return false; 11144 } 11145 11146 /** 11147 * Amount by which to extend the left fading region. Called only when 11148 * {@link #isPaddingOffsetRequired()} returns true. 11149 * 11150 * @return The left padding offset in pixels. 11151 * 11152 * @see #isPaddingOffsetRequired() 11153 * 11154 * @since CURRENT 11155 */ 11156 protected int getLeftPaddingOffset() { 11157 return 0; 11158 } 11159 11160 /** 11161 * Amount by which to extend the right fading region. Called only when 11162 * {@link #isPaddingOffsetRequired()} returns true. 11163 * 11164 * @return The right padding offset in pixels. 11165 * 11166 * @see #isPaddingOffsetRequired() 11167 * 11168 * @since CURRENT 11169 */ 11170 protected int getRightPaddingOffset() { 11171 return 0; 11172 } 11173 11174 /** 11175 * Amount by which to extend the top fading region. Called only when 11176 * {@link #isPaddingOffsetRequired()} returns true. 11177 * 11178 * @return The top padding offset in pixels. 11179 * 11180 * @see #isPaddingOffsetRequired() 11181 * 11182 * @since CURRENT 11183 */ 11184 protected int getTopPaddingOffset() { 11185 return 0; 11186 } 11187 11188 /** 11189 * Amount by which to extend the bottom fading region. Called only when 11190 * {@link #isPaddingOffsetRequired()} returns true. 11191 * 11192 * @return The bottom padding offset in pixels. 11193 * 11194 * @see #isPaddingOffsetRequired() 11195 * 11196 * @since CURRENT 11197 */ 11198 protected int getBottomPaddingOffset() { 11199 return 0; 11200 } 11201 11202 /** 11203 * @hide 11204 * @param offsetRequired 11205 */ 11206 protected int getFadeTop(boolean offsetRequired) { 11207 int top = mPaddingTop; 11208 if (offsetRequired) top += getTopPaddingOffset(); 11209 return top; 11210 } 11211 11212 /** 11213 * @hide 11214 * @param offsetRequired 11215 */ 11216 protected int getFadeHeight(boolean offsetRequired) { 11217 int padding = mPaddingTop; 11218 if (offsetRequired) padding += getTopPaddingOffset(); 11219 return mBottom - mTop - mPaddingBottom - padding; 11220 } 11221 11222 /** 11223 * <p>Indicates whether this view is attached to a hardware accelerated 11224 * window or not.</p> 11225 * 11226 * <p>Even if this method returns true, it does not mean that every call 11227 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 11228 * accelerated {@link android.graphics.Canvas}. For instance, if this view 11229 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 11230 * window is hardware accelerated, 11231 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 11232 * return false, and this method will return true.</p> 11233 * 11234 * @return True if the view is attached to a window and the window is 11235 * hardware accelerated; false in any other case. 11236 */ 11237 public boolean isHardwareAccelerated() { 11238 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 11239 } 11240 11241 /** 11242 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 11243 * case of an active Animation being run on the view. 11244 */ 11245 private boolean drawAnimation(ViewGroup parent, long drawingTime, 11246 Animation a, boolean scalingRequired) { 11247 Transformation invalidationTransform; 11248 final int flags = parent.mGroupFlags; 11249 final boolean initialized = a.isInitialized(); 11250 if (!initialized) { 11251 a.initialize(mRight - mLeft, mBottom - mTop, getWidth(), getHeight()); 11252 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 11253 onAnimationStart(); 11254 } 11255 11256 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 11257 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 11258 if (parent.mInvalidationTransformation == null) { 11259 parent.mInvalidationTransformation = new Transformation(); 11260 } 11261 invalidationTransform = parent.mInvalidationTransformation; 11262 a.getTransformation(drawingTime, invalidationTransform, 1f); 11263 } else { 11264 invalidationTransform = parent.mChildTransformation; 11265 } 11266 if (more) { 11267 if (!a.willChangeBounds()) { 11268 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 11269 parent.FLAG_OPTIMIZE_INVALIDATE) { 11270 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 11271 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 11272 // The child need to draw an animation, potentially offscreen, so 11273 // make sure we do not cancel invalidate requests 11274 parent.mPrivateFlags |= DRAW_ANIMATION; 11275 parent.invalidate(mLeft, mTop, mRight, mBottom); 11276 } 11277 } else { 11278 if (parent.mInvalidateRegion == null) { 11279 parent.mInvalidateRegion = new RectF(); 11280 } 11281 final RectF region = parent.mInvalidateRegion; 11282 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 11283 invalidationTransform); 11284 11285 // The child need to draw an animation, potentially offscreen, so 11286 // make sure we do not cancel invalidate requests 11287 parent.mPrivateFlags |= DRAW_ANIMATION; 11288 11289 final int left = mLeft + (int) region.left; 11290 final int top = mTop + (int) region.top; 11291 parent.invalidate(left, top, left + (int) (region.width() + .5f), 11292 top + (int) (region.height() + .5f)); 11293 } 11294 } 11295 return more; 11296 } 11297 11298 void setDisplayListProperties() { 11299 setDisplayListProperties(mDisplayList); 11300 } 11301 11302 /** 11303 * This method is called by getDisplayList() when a display list is created or re-rendered. 11304 * It sets or resets the current value of all properties on that display list (resetting is 11305 * necessary when a display list is being re-created, because we need to make sure that 11306 * previously-set transform values 11307 */ 11308 void setDisplayListProperties(DisplayList displayList) { 11309 if (USE_DISPLAY_LIST_PROPERTIES && displayList != null) { 11310 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 11311 if (mParent instanceof ViewGroup) { 11312 displayList.setClipChildren( 11313 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 11314 } 11315 if (mAttachInfo != null && mAttachInfo.mScalingRequired && 11316 mAttachInfo.mApplicationScale != 1.0f) { 11317 displayList.setApplicationScale(1f / mAttachInfo.mApplicationScale); 11318 } 11319 if (mTransformationInfo != null) { 11320 displayList.setTransformationInfo(mTransformationInfo.mAlpha, 11321 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 11322 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 11323 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 11324 mTransformationInfo.mScaleY); 11325 displayList.setCameraDistance(getCameraDistance()); 11326 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 11327 displayList.setPivotX(getPivotX()); 11328 displayList.setPivotY(getPivotY()); 11329 } 11330 } 11331 } 11332 } 11333 11334 /** 11335 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 11336 * This draw() method is an implementation detail and is not intended to be overridden or 11337 * to be called from anywhere else other than ViewGroup.drawChild(). 11338 */ 11339 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 11340 boolean useDisplayListProperties = USE_DISPLAY_LIST_PROPERTIES && mAttachInfo != null && 11341 mAttachInfo.mHardwareAccelerated; 11342 boolean more = false; 11343 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 11344 final int flags = parent.mGroupFlags; 11345 11346 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 11347 parent.mChildTransformation.clear(); 11348 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 11349 } 11350 11351 Transformation transformToApply = null; 11352 boolean concatMatrix = false; 11353 11354 boolean scalingRequired = false; 11355 boolean caching; 11356 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 11357 11358 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 11359 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 11360 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 11361 caching = true; 11362 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 11363 } else { 11364 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 11365 } 11366 11367 final Animation a = getAnimation(); 11368 if (a != null) { 11369 more = drawAnimation(parent, drawingTime, a, scalingRequired); 11370 concatMatrix = a.willChangeTransformationMatrix(); 11371 transformToApply = parent.mChildTransformation; 11372 } else if ((flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 11373 final boolean hasTransform = 11374 parent.getChildStaticTransformation(this, parent.mChildTransformation); 11375 if (hasTransform) { 11376 final int transformType = parent.mChildTransformation.getTransformationType(); 11377 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 11378 parent.mChildTransformation : null; 11379 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 11380 } 11381 } 11382 11383 concatMatrix |= !childHasIdentityMatrix; 11384 11385 // Sets the flag as early as possible to allow draw() implementations 11386 // to call invalidate() successfully when doing animations 11387 mPrivateFlags |= DRAWN; 11388 11389 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 11390 (mPrivateFlags & DRAW_ANIMATION) == 0) { 11391 return more; 11392 } 11393 11394 if (hardwareAccelerated) { 11395 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 11396 // retain the flag's value temporarily in the mRecreateDisplayList flag 11397 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 11398 mPrivateFlags &= ~INVALIDATED; 11399 } 11400 11401 computeScroll(); 11402 11403 final int sx = mScrollX; 11404 final int sy = mScrollY; 11405 11406 DisplayList displayList = null; 11407 Bitmap cache = null; 11408 boolean hasDisplayList = false; 11409 if (caching) { 11410 if (!hardwareAccelerated) { 11411 if (layerType != LAYER_TYPE_NONE) { 11412 layerType = LAYER_TYPE_SOFTWARE; 11413 buildDrawingCache(true); 11414 } 11415 cache = getDrawingCache(true); 11416 } else { 11417 switch (layerType) { 11418 case LAYER_TYPE_SOFTWARE: 11419 buildDrawingCache(true); 11420 cache = getDrawingCache(true); 11421 break; 11422 case LAYER_TYPE_HARDWARE: 11423 if (useDisplayListProperties) { 11424 hasDisplayList = canHaveDisplayList(); 11425 } 11426 break; 11427 case LAYER_TYPE_NONE: 11428 // Delay getting the display list until animation-driven alpha values are 11429 // set up and possibly passed on to the view 11430 hasDisplayList = canHaveDisplayList(); 11431 break; 11432 } 11433 } 11434 } 11435 useDisplayListProperties &= hasDisplayList; 11436 11437 final boolean hasNoCache = cache == null || hasDisplayList; 11438 final boolean offsetForScroll = cache == null && !hasDisplayList && 11439 layerType != LAYER_TYPE_HARDWARE; 11440 11441 int restoreTo = -1; 11442 if (!useDisplayListProperties) { 11443 restoreTo = canvas.save(); 11444 } 11445 if (offsetForScroll) { 11446 canvas.translate(mLeft - sx, mTop - sy); 11447 } else { 11448 if (!useDisplayListProperties) { 11449 canvas.translate(mLeft, mTop); 11450 } 11451 if (scalingRequired) { 11452 if (useDisplayListProperties) { 11453 restoreTo = canvas.save(); 11454 } 11455 // mAttachInfo cannot be null, otherwise scalingRequired == false 11456 final float scale = 1.0f / mAttachInfo.mApplicationScale; 11457 canvas.scale(scale, scale); 11458 } 11459 } 11460 11461 float alpha = useDisplayListProperties ? 1 : getAlpha(); 11462 if (transformToApply != null || alpha < 1.0f || !hasIdentityMatrix()) { 11463 if (transformToApply != null || !childHasIdentityMatrix) { 11464 int transX = 0; 11465 int transY = 0; 11466 11467 if (offsetForScroll) { 11468 transX = -sx; 11469 transY = -sy; 11470 } 11471 11472 if (transformToApply != null) { 11473 if (concatMatrix) { 11474 // Undo the scroll translation, apply the transformation matrix, 11475 // then redo the scroll translate to get the correct result. 11476 if (!useDisplayListProperties) { 11477 canvas.translate(-transX, -transY); 11478 canvas.concat(transformToApply.getMatrix()); 11479 canvas.translate(transX, transY); 11480 } 11481 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 11482 } 11483 11484 float transformAlpha = transformToApply.getAlpha(); 11485 if (transformAlpha < 1.0f) { 11486 alpha *= transformToApply.getAlpha(); 11487 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 11488 } 11489 } 11490 11491 if (!childHasIdentityMatrix && !useDisplayListProperties) { 11492 canvas.translate(-transX, -transY); 11493 canvas.concat(getMatrix()); 11494 canvas.translate(transX, transY); 11495 } 11496 } 11497 11498 if (alpha < 1.0f) { 11499 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 11500 if (hasNoCache) { 11501 final int multipliedAlpha = (int) (255 * alpha); 11502 if (!onSetAlpha(multipliedAlpha)) { 11503 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 11504 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 11505 layerType != LAYER_TYPE_NONE) { 11506 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 11507 } 11508 if (layerType == LAYER_TYPE_NONE) { 11509 if (!useDisplayListProperties) { 11510 final int scrollX = hasDisplayList ? 0 : sx; 11511 final int scrollY = hasDisplayList ? 0 : sy; 11512 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 11513 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 11514 } 11515 } 11516 } else { 11517 // Alpha is handled by the child directly, clobber the layer's alpha 11518 mPrivateFlags |= ALPHA_SET; 11519 } 11520 } 11521 } 11522 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 11523 onSetAlpha(255); 11524 mPrivateFlags &= ~ALPHA_SET; 11525 } 11526 11527 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 11528 !useDisplayListProperties) { 11529 if (offsetForScroll) { 11530 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 11531 } else { 11532 if (!scalingRequired || cache == null) { 11533 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 11534 } else { 11535 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 11536 } 11537 } 11538 } 11539 11540 if (hasDisplayList) { 11541 displayList = getDisplayList(); 11542 if (!displayList.isValid()) { 11543 // Uncommon, but possible. If a view is removed from the hierarchy during the call 11544 // to getDisplayList(), the display list will be marked invalid and we should not 11545 // try to use it again. 11546 displayList = null; 11547 hasDisplayList = false; 11548 } 11549 } 11550 11551 if (hasNoCache) { 11552 boolean layerRendered = false; 11553 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 11554 final HardwareLayer layer = getHardwareLayer(); 11555 if (layer != null && layer.isValid()) { 11556 mLayerPaint.setAlpha((int) (alpha * 255)); 11557 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 11558 layerRendered = true; 11559 } else { 11560 final int scrollX = hasDisplayList ? 0 : sx; 11561 final int scrollY = hasDisplayList ? 0 : sy; 11562 canvas.saveLayer(scrollX, scrollY, 11563 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 11564 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 11565 } 11566 } 11567 11568 if (!layerRendered) { 11569 if (!hasDisplayList) { 11570 // Fast path for layouts with no backgrounds 11571 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 11572 if (ViewDebug.TRACE_HIERARCHY) { 11573 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 11574 } 11575 mPrivateFlags &= ~DIRTY_MASK; 11576 dispatchDraw(canvas); 11577 } else { 11578 draw(canvas); 11579 } 11580 } else { 11581 mPrivateFlags &= ~DIRTY_MASK; 11582 ((HardwareCanvas) canvas).drawDisplayList(displayList, 11583 mRight - mLeft, mBottom - mTop, null, flags); 11584 } 11585 } 11586 } else if (cache != null) { 11587 mPrivateFlags &= ~DIRTY_MASK; 11588 Paint cachePaint; 11589 11590 if (layerType == LAYER_TYPE_NONE) { 11591 cachePaint = parent.mCachePaint; 11592 if (cachePaint == null) { 11593 cachePaint = new Paint(); 11594 cachePaint.setDither(false); 11595 parent.mCachePaint = cachePaint; 11596 } 11597 if (alpha < 1.0f) { 11598 cachePaint.setAlpha((int) (alpha * 255)); 11599 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 11600 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 11601 cachePaint.setAlpha(255); 11602 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 11603 } 11604 } else { 11605 cachePaint = mLayerPaint; 11606 cachePaint.setAlpha((int) (alpha * 255)); 11607 } 11608 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 11609 } 11610 11611 if (restoreTo >= 0) { 11612 canvas.restoreToCount(restoreTo); 11613 } 11614 11615 if (a != null && !more) { 11616 if (!hardwareAccelerated && !a.getFillAfter()) { 11617 onSetAlpha(255); 11618 } 11619 parent.finishAnimatingView(this, a); 11620 } 11621 11622 if (more && hardwareAccelerated) { 11623 // invalidation is the trigger to recreate display lists, so if we're using 11624 // display lists to render, force an invalidate to allow the animation to 11625 // continue drawing another frame 11626 parent.invalidate(true); 11627 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 11628 // alpha animations should cause the child to recreate its display list 11629 invalidate(true); 11630 } 11631 } 11632 11633 mRecreateDisplayList = false; 11634 11635 return more; 11636 } 11637 11638 /** 11639 * Manually render this view (and all of its children) to the given Canvas. 11640 * The view must have already done a full layout before this function is 11641 * called. When implementing a view, implement 11642 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 11643 * If you do need to override this method, call the superclass version. 11644 * 11645 * @param canvas The Canvas to which the View is rendered. 11646 */ 11647 public void draw(Canvas canvas) { 11648 if (ViewDebug.TRACE_HIERARCHY) { 11649 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 11650 } 11651 11652 final int privateFlags = mPrivateFlags; 11653 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 11654 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 11655 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 11656 11657 /* 11658 * Draw traversal performs several drawing steps which must be executed 11659 * in the appropriate order: 11660 * 11661 * 1. Draw the background 11662 * 2. If necessary, save the canvas' layers to prepare for fading 11663 * 3. Draw view's content 11664 * 4. Draw children 11665 * 5. If necessary, draw the fading edges and restore layers 11666 * 6. Draw decorations (scrollbars for instance) 11667 */ 11668 11669 // Step 1, draw the background, if needed 11670 int saveCount; 11671 11672 if (!dirtyOpaque) { 11673 final Drawable background = mBGDrawable; 11674 if (background != null) { 11675 final int scrollX = mScrollX; 11676 final int scrollY = mScrollY; 11677 11678 if (mBackgroundSizeChanged) { 11679 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 11680 mBackgroundSizeChanged = false; 11681 } 11682 11683 if ((scrollX | scrollY) == 0) { 11684 background.draw(canvas); 11685 } else { 11686 canvas.translate(scrollX, scrollY); 11687 background.draw(canvas); 11688 canvas.translate(-scrollX, -scrollY); 11689 } 11690 } 11691 } 11692 11693 // skip step 2 & 5 if possible (common case) 11694 final int viewFlags = mViewFlags; 11695 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 11696 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 11697 if (!verticalEdges && !horizontalEdges) { 11698 // Step 3, draw the content 11699 if (!dirtyOpaque) onDraw(canvas); 11700 11701 // Step 4, draw the children 11702 dispatchDraw(canvas); 11703 11704 // Step 6, draw decorations (scrollbars) 11705 onDrawScrollBars(canvas); 11706 11707 // we're done... 11708 return; 11709 } 11710 11711 /* 11712 * Here we do the full fledged routine... 11713 * (this is an uncommon case where speed matters less, 11714 * this is why we repeat some of the tests that have been 11715 * done above) 11716 */ 11717 11718 boolean drawTop = false; 11719 boolean drawBottom = false; 11720 boolean drawLeft = false; 11721 boolean drawRight = false; 11722 11723 float topFadeStrength = 0.0f; 11724 float bottomFadeStrength = 0.0f; 11725 float leftFadeStrength = 0.0f; 11726 float rightFadeStrength = 0.0f; 11727 11728 // Step 2, save the canvas' layers 11729 int paddingLeft = mPaddingLeft; 11730 11731 final boolean offsetRequired = isPaddingOffsetRequired(); 11732 if (offsetRequired) { 11733 paddingLeft += getLeftPaddingOffset(); 11734 } 11735 11736 int left = mScrollX + paddingLeft; 11737 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 11738 int top = mScrollY + getFadeTop(offsetRequired); 11739 int bottom = top + getFadeHeight(offsetRequired); 11740 11741 if (offsetRequired) { 11742 right += getRightPaddingOffset(); 11743 bottom += getBottomPaddingOffset(); 11744 } 11745 11746 final ScrollabilityCache scrollabilityCache = mScrollCache; 11747 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 11748 int length = (int) fadeHeight; 11749 11750 // clip the fade length if top and bottom fades overlap 11751 // overlapping fades produce odd-looking artifacts 11752 if (verticalEdges && (top + length > bottom - length)) { 11753 length = (bottom - top) / 2; 11754 } 11755 11756 // also clip horizontal fades if necessary 11757 if (horizontalEdges && (left + length > right - length)) { 11758 length = (right - left) / 2; 11759 } 11760 11761 if (verticalEdges) { 11762 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 11763 drawTop = topFadeStrength * fadeHeight > 1.0f; 11764 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 11765 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 11766 } 11767 11768 if (horizontalEdges) { 11769 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 11770 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 11771 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 11772 drawRight = rightFadeStrength * fadeHeight > 1.0f; 11773 } 11774 11775 saveCount = canvas.getSaveCount(); 11776 11777 int solidColor = getSolidColor(); 11778 if (solidColor == 0) { 11779 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 11780 11781 if (drawTop) { 11782 canvas.saveLayer(left, top, right, top + length, null, flags); 11783 } 11784 11785 if (drawBottom) { 11786 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 11787 } 11788 11789 if (drawLeft) { 11790 canvas.saveLayer(left, top, left + length, bottom, null, flags); 11791 } 11792 11793 if (drawRight) { 11794 canvas.saveLayer(right - length, top, right, bottom, null, flags); 11795 } 11796 } else { 11797 scrollabilityCache.setFadeColor(solidColor); 11798 } 11799 11800 // Step 3, draw the content 11801 if (!dirtyOpaque) onDraw(canvas); 11802 11803 // Step 4, draw the children 11804 dispatchDraw(canvas); 11805 11806 // Step 5, draw the fade effect and restore layers 11807 final Paint p = scrollabilityCache.paint; 11808 final Matrix matrix = scrollabilityCache.matrix; 11809 final Shader fade = scrollabilityCache.shader; 11810 11811 if (drawTop) { 11812 matrix.setScale(1, fadeHeight * topFadeStrength); 11813 matrix.postTranslate(left, top); 11814 fade.setLocalMatrix(matrix); 11815 canvas.drawRect(left, top, right, top + length, p); 11816 } 11817 11818 if (drawBottom) { 11819 matrix.setScale(1, fadeHeight * bottomFadeStrength); 11820 matrix.postRotate(180); 11821 matrix.postTranslate(left, bottom); 11822 fade.setLocalMatrix(matrix); 11823 canvas.drawRect(left, bottom - length, right, bottom, p); 11824 } 11825 11826 if (drawLeft) { 11827 matrix.setScale(1, fadeHeight * leftFadeStrength); 11828 matrix.postRotate(-90); 11829 matrix.postTranslate(left, top); 11830 fade.setLocalMatrix(matrix); 11831 canvas.drawRect(left, top, left + length, bottom, p); 11832 } 11833 11834 if (drawRight) { 11835 matrix.setScale(1, fadeHeight * rightFadeStrength); 11836 matrix.postRotate(90); 11837 matrix.postTranslate(right, top); 11838 fade.setLocalMatrix(matrix); 11839 canvas.drawRect(right - length, top, right, bottom, p); 11840 } 11841 11842 canvas.restoreToCount(saveCount); 11843 11844 // Step 6, draw decorations (scrollbars) 11845 onDrawScrollBars(canvas); 11846 } 11847 11848 /** 11849 * Override this if your view is known to always be drawn on top of a solid color background, 11850 * and needs to draw fading edges. Returning a non-zero color enables the view system to 11851 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 11852 * should be set to 0xFF. 11853 * 11854 * @see #setVerticalFadingEdgeEnabled(boolean) 11855 * @see #setHorizontalFadingEdgeEnabled(boolean) 11856 * 11857 * @return The known solid color background for this view, or 0 if the color may vary 11858 */ 11859 @ViewDebug.ExportedProperty(category = "drawing") 11860 public int getSolidColor() { 11861 return 0; 11862 } 11863 11864 /** 11865 * Build a human readable string representation of the specified view flags. 11866 * 11867 * @param flags the view flags to convert to a string 11868 * @return a String representing the supplied flags 11869 */ 11870 private static String printFlags(int flags) { 11871 String output = ""; 11872 int numFlags = 0; 11873 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 11874 output += "TAKES_FOCUS"; 11875 numFlags++; 11876 } 11877 11878 switch (flags & VISIBILITY_MASK) { 11879 case INVISIBLE: 11880 if (numFlags > 0) { 11881 output += " "; 11882 } 11883 output += "INVISIBLE"; 11884 // USELESS HERE numFlags++; 11885 break; 11886 case GONE: 11887 if (numFlags > 0) { 11888 output += " "; 11889 } 11890 output += "GONE"; 11891 // USELESS HERE numFlags++; 11892 break; 11893 default: 11894 break; 11895 } 11896 return output; 11897 } 11898 11899 /** 11900 * Build a human readable string representation of the specified private 11901 * view flags. 11902 * 11903 * @param privateFlags the private view flags to convert to a string 11904 * @return a String representing the supplied flags 11905 */ 11906 private static String printPrivateFlags(int privateFlags) { 11907 String output = ""; 11908 int numFlags = 0; 11909 11910 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 11911 output += "WANTS_FOCUS"; 11912 numFlags++; 11913 } 11914 11915 if ((privateFlags & FOCUSED) == FOCUSED) { 11916 if (numFlags > 0) { 11917 output += " "; 11918 } 11919 output += "FOCUSED"; 11920 numFlags++; 11921 } 11922 11923 if ((privateFlags & SELECTED) == SELECTED) { 11924 if (numFlags > 0) { 11925 output += " "; 11926 } 11927 output += "SELECTED"; 11928 numFlags++; 11929 } 11930 11931 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 11932 if (numFlags > 0) { 11933 output += " "; 11934 } 11935 output += "IS_ROOT_NAMESPACE"; 11936 numFlags++; 11937 } 11938 11939 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 11940 if (numFlags > 0) { 11941 output += " "; 11942 } 11943 output += "HAS_BOUNDS"; 11944 numFlags++; 11945 } 11946 11947 if ((privateFlags & DRAWN) == DRAWN) { 11948 if (numFlags > 0) { 11949 output += " "; 11950 } 11951 output += "DRAWN"; 11952 // USELESS HERE numFlags++; 11953 } 11954 return output; 11955 } 11956 11957 /** 11958 * <p>Indicates whether or not this view's layout will be requested during 11959 * the next hierarchy layout pass.</p> 11960 * 11961 * @return true if the layout will be forced during next layout pass 11962 */ 11963 public boolean isLayoutRequested() { 11964 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 11965 } 11966 11967 /** 11968 * Assign a size and position to a view and all of its 11969 * descendants 11970 * 11971 * <p>This is the second phase of the layout mechanism. 11972 * (The first is measuring). In this phase, each parent calls 11973 * layout on all of its children to position them. 11974 * This is typically done using the child measurements 11975 * that were stored in the measure pass().</p> 11976 * 11977 * <p>Derived classes should not override this method. 11978 * Derived classes with children should override 11979 * onLayout. In that method, they should 11980 * call layout on each of their children.</p> 11981 * 11982 * @param l Left position, relative to parent 11983 * @param t Top position, relative to parent 11984 * @param r Right position, relative to parent 11985 * @param b Bottom position, relative to parent 11986 */ 11987 @SuppressWarnings({"unchecked"}) 11988 public void layout(int l, int t, int r, int b) { 11989 int oldL = mLeft; 11990 int oldT = mTop; 11991 int oldB = mBottom; 11992 int oldR = mRight; 11993 boolean changed = setFrame(l, t, r, b); 11994 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 11995 if (ViewDebug.TRACE_HIERARCHY) { 11996 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 11997 } 11998 11999 onLayout(changed, l, t, r, b); 12000 mPrivateFlags &= ~LAYOUT_REQUIRED; 12001 12002 ListenerInfo li = mListenerInfo; 12003 if (li != null && li.mOnLayoutChangeListeners != null) { 12004 ArrayList<OnLayoutChangeListener> listenersCopy = 12005 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 12006 int numListeners = listenersCopy.size(); 12007 for (int i = 0; i < numListeners; ++i) { 12008 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 12009 } 12010 } 12011 } 12012 mPrivateFlags &= ~FORCE_LAYOUT; 12013 } 12014 12015 /** 12016 * Called from layout when this view should 12017 * assign a size and position to each of its children. 12018 * 12019 * Derived classes with children should override 12020 * this method and call layout on each of 12021 * their children. 12022 * @param changed This is a new size or position for this view 12023 * @param left Left position, relative to parent 12024 * @param top Top position, relative to parent 12025 * @param right Right position, relative to parent 12026 * @param bottom Bottom position, relative to parent 12027 */ 12028 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 12029 } 12030 12031 /** 12032 * Assign a size and position to this view. 12033 * 12034 * This is called from layout. 12035 * 12036 * @param left Left position, relative to parent 12037 * @param top Top position, relative to parent 12038 * @param right Right position, relative to parent 12039 * @param bottom Bottom position, relative to parent 12040 * @return true if the new size and position are different than the 12041 * previous ones 12042 * {@hide} 12043 */ 12044 protected boolean setFrame(int left, int top, int right, int bottom) { 12045 boolean changed = false; 12046 12047 if (DBG) { 12048 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 12049 + right + "," + bottom + ")"); 12050 } 12051 12052 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 12053 changed = true; 12054 12055 // Remember our drawn bit 12056 int drawn = mPrivateFlags & DRAWN; 12057 12058 int oldWidth = mRight - mLeft; 12059 int oldHeight = mBottom - mTop; 12060 int newWidth = right - left; 12061 int newHeight = bottom - top; 12062 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 12063 12064 // Invalidate our old position 12065 invalidate(sizeChanged); 12066 12067 mLeft = left; 12068 mTop = top; 12069 mRight = right; 12070 mBottom = bottom; 12071 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 12072 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12073 } 12074 12075 mPrivateFlags |= HAS_BOUNDS; 12076 12077 12078 if (sizeChanged) { 12079 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 12080 // A change in dimension means an auto-centered pivot point changes, too 12081 if (mTransformationInfo != null) { 12082 mTransformationInfo.mMatrixDirty = true; 12083 } 12084 } 12085 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 12086 } 12087 12088 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 12089 // If we are visible, force the DRAWN bit to on so that 12090 // this invalidate will go through (at least to our parent). 12091 // This is because someone may have invalidated this view 12092 // before this call to setFrame came in, thereby clearing 12093 // the DRAWN bit. 12094 mPrivateFlags |= DRAWN; 12095 invalidate(sizeChanged); 12096 // parent display list may need to be recreated based on a change in the bounds 12097 // of any child 12098 invalidateParentCaches(); 12099 } 12100 12101 // Reset drawn bit to original value (invalidate turns it off) 12102 mPrivateFlags |= drawn; 12103 12104 mBackgroundSizeChanged = true; 12105 } 12106 return changed; 12107 } 12108 12109 /** 12110 * Finalize inflating a view from XML. This is called as the last phase 12111 * of inflation, after all child views have been added. 12112 * 12113 * <p>Even if the subclass overrides onFinishInflate, they should always be 12114 * sure to call the super method, so that we get called. 12115 */ 12116 protected void onFinishInflate() { 12117 } 12118 12119 /** 12120 * Returns the resources associated with this view. 12121 * 12122 * @return Resources object. 12123 */ 12124 public Resources getResources() { 12125 return mResources; 12126 } 12127 12128 /** 12129 * Invalidates the specified Drawable. 12130 * 12131 * @param drawable the drawable to invalidate 12132 */ 12133 public void invalidateDrawable(Drawable drawable) { 12134 if (verifyDrawable(drawable)) { 12135 final Rect dirty = drawable.getBounds(); 12136 final int scrollX = mScrollX; 12137 final int scrollY = mScrollY; 12138 12139 invalidate(dirty.left + scrollX, dirty.top + scrollY, 12140 dirty.right + scrollX, dirty.bottom + scrollY); 12141 } 12142 } 12143 12144 /** 12145 * Schedules an action on a drawable to occur at a specified time. 12146 * 12147 * @param who the recipient of the action 12148 * @param what the action to run on the drawable 12149 * @param when the time at which the action must occur. Uses the 12150 * {@link SystemClock#uptimeMillis} timebase. 12151 */ 12152 public void scheduleDrawable(Drawable who, Runnable what, long when) { 12153 if (verifyDrawable(who) && what != null) { 12154 final long delay = when - SystemClock.uptimeMillis(); 12155 if (mAttachInfo != null) { 12156 mAttachInfo.mViewRootImpl.mChoreographer.postAnimationCallbackDelayed( 12157 what, who, Choreographer.subtractFrameDelay(delay)); 12158 } else { 12159 ViewRootImpl.getRunQueue().postDelayed(what, delay); 12160 } 12161 } 12162 } 12163 12164 /** 12165 * Cancels a scheduled action on a drawable. 12166 * 12167 * @param who the recipient of the action 12168 * @param what the action to cancel 12169 */ 12170 public void unscheduleDrawable(Drawable who, Runnable what) { 12171 if (verifyDrawable(who) && what != null) { 12172 if (mAttachInfo != null) { 12173 mAttachInfo.mViewRootImpl.mChoreographer.removeAnimationCallbacks(what, who); 12174 } else { 12175 ViewRootImpl.getRunQueue().removeCallbacks(what); 12176 } 12177 } 12178 } 12179 12180 /** 12181 * Unschedule any events associated with the given Drawable. This can be 12182 * used when selecting a new Drawable into a view, so that the previous 12183 * one is completely unscheduled. 12184 * 12185 * @param who The Drawable to unschedule. 12186 * 12187 * @see #drawableStateChanged 12188 */ 12189 public void unscheduleDrawable(Drawable who) { 12190 if (mAttachInfo != null && who != null) { 12191 mAttachInfo.mViewRootImpl.mChoreographer.removeAnimationCallbacks(null, who); 12192 } 12193 } 12194 12195 /** 12196 * Return the layout direction of a given Drawable. 12197 * 12198 * @param who the Drawable to query 12199 */ 12200 public int getResolvedLayoutDirection(Drawable who) { 12201 return (who == mBGDrawable) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 12202 } 12203 12204 /** 12205 * If your view subclass is displaying its own Drawable objects, it should 12206 * override this function and return true for any Drawable it is 12207 * displaying. This allows animations for those drawables to be 12208 * scheduled. 12209 * 12210 * <p>Be sure to call through to the super class when overriding this 12211 * function. 12212 * 12213 * @param who The Drawable to verify. Return true if it is one you are 12214 * displaying, else return the result of calling through to the 12215 * super class. 12216 * 12217 * @return boolean If true than the Drawable is being displayed in the 12218 * view; else false and it is not allowed to animate. 12219 * 12220 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 12221 * @see #drawableStateChanged() 12222 */ 12223 protected boolean verifyDrawable(Drawable who) { 12224 return who == mBGDrawable; 12225 } 12226 12227 /** 12228 * This function is called whenever the state of the view changes in such 12229 * a way that it impacts the state of drawables being shown. 12230 * 12231 * <p>Be sure to call through to the superclass when overriding this 12232 * function. 12233 * 12234 * @see Drawable#setState(int[]) 12235 */ 12236 protected void drawableStateChanged() { 12237 Drawable d = mBGDrawable; 12238 if (d != null && d.isStateful()) { 12239 d.setState(getDrawableState()); 12240 } 12241 } 12242 12243 /** 12244 * Call this to force a view to update its drawable state. This will cause 12245 * drawableStateChanged to be called on this view. Views that are interested 12246 * in the new state should call getDrawableState. 12247 * 12248 * @see #drawableStateChanged 12249 * @see #getDrawableState 12250 */ 12251 public void refreshDrawableState() { 12252 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 12253 drawableStateChanged(); 12254 12255 ViewParent parent = mParent; 12256 if (parent != null) { 12257 parent.childDrawableStateChanged(this); 12258 } 12259 } 12260 12261 /** 12262 * Return an array of resource IDs of the drawable states representing the 12263 * current state of the view. 12264 * 12265 * @return The current drawable state 12266 * 12267 * @see Drawable#setState(int[]) 12268 * @see #drawableStateChanged() 12269 * @see #onCreateDrawableState(int) 12270 */ 12271 public final int[] getDrawableState() { 12272 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 12273 return mDrawableState; 12274 } else { 12275 mDrawableState = onCreateDrawableState(0); 12276 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 12277 return mDrawableState; 12278 } 12279 } 12280 12281 /** 12282 * Generate the new {@link android.graphics.drawable.Drawable} state for 12283 * this view. This is called by the view 12284 * system when the cached Drawable state is determined to be invalid. To 12285 * retrieve the current state, you should use {@link #getDrawableState}. 12286 * 12287 * @param extraSpace if non-zero, this is the number of extra entries you 12288 * would like in the returned array in which you can place your own 12289 * states. 12290 * 12291 * @return Returns an array holding the current {@link Drawable} state of 12292 * the view. 12293 * 12294 * @see #mergeDrawableStates(int[], int[]) 12295 */ 12296 protected int[] onCreateDrawableState(int extraSpace) { 12297 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 12298 mParent instanceof View) { 12299 return ((View) mParent).onCreateDrawableState(extraSpace); 12300 } 12301 12302 int[] drawableState; 12303 12304 int privateFlags = mPrivateFlags; 12305 12306 int viewStateIndex = 0; 12307 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 12308 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 12309 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 12310 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 12311 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 12312 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 12313 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 12314 HardwareRenderer.isAvailable()) { 12315 // This is set if HW acceleration is requested, even if the current 12316 // process doesn't allow it. This is just to allow app preview 12317 // windows to better match their app. 12318 viewStateIndex |= VIEW_STATE_ACCELERATED; 12319 } 12320 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 12321 12322 final int privateFlags2 = mPrivateFlags2; 12323 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 12324 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 12325 12326 drawableState = VIEW_STATE_SETS[viewStateIndex]; 12327 12328 //noinspection ConstantIfStatement 12329 if (false) { 12330 Log.i("View", "drawableStateIndex=" + viewStateIndex); 12331 Log.i("View", toString() 12332 + " pressed=" + ((privateFlags & PRESSED) != 0) 12333 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 12334 + " fo=" + hasFocus() 12335 + " sl=" + ((privateFlags & SELECTED) != 0) 12336 + " wf=" + hasWindowFocus() 12337 + ": " + Arrays.toString(drawableState)); 12338 } 12339 12340 if (extraSpace == 0) { 12341 return drawableState; 12342 } 12343 12344 final int[] fullState; 12345 if (drawableState != null) { 12346 fullState = new int[drawableState.length + extraSpace]; 12347 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 12348 } else { 12349 fullState = new int[extraSpace]; 12350 } 12351 12352 return fullState; 12353 } 12354 12355 /** 12356 * Merge your own state values in <var>additionalState</var> into the base 12357 * state values <var>baseState</var> that were returned by 12358 * {@link #onCreateDrawableState(int)}. 12359 * 12360 * @param baseState The base state values returned by 12361 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 12362 * own additional state values. 12363 * 12364 * @param additionalState The additional state values you would like 12365 * added to <var>baseState</var>; this array is not modified. 12366 * 12367 * @return As a convenience, the <var>baseState</var> array you originally 12368 * passed into the function is returned. 12369 * 12370 * @see #onCreateDrawableState(int) 12371 */ 12372 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 12373 final int N = baseState.length; 12374 int i = N - 1; 12375 while (i >= 0 && baseState[i] == 0) { 12376 i--; 12377 } 12378 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 12379 return baseState; 12380 } 12381 12382 /** 12383 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 12384 * on all Drawable objects associated with this view. 12385 */ 12386 public void jumpDrawablesToCurrentState() { 12387 if (mBGDrawable != null) { 12388 mBGDrawable.jumpToCurrentState(); 12389 } 12390 } 12391 12392 /** 12393 * Sets the background color for this view. 12394 * @param color the color of the background 12395 */ 12396 @RemotableViewMethod 12397 public void setBackgroundColor(int color) { 12398 if (mBGDrawable instanceof ColorDrawable) { 12399 ((ColorDrawable) mBGDrawable).setColor(color); 12400 } else { 12401 setBackgroundDrawable(new ColorDrawable(color)); 12402 } 12403 } 12404 12405 /** 12406 * Set the background to a given resource. The resource should refer to 12407 * a Drawable object or 0 to remove the background. 12408 * @param resid The identifier of the resource. 12409 * @attr ref android.R.styleable#View_background 12410 */ 12411 @RemotableViewMethod 12412 public void setBackgroundResource(int resid) { 12413 if (resid != 0 && resid == mBackgroundResource) { 12414 return; 12415 } 12416 12417 Drawable d= null; 12418 if (resid != 0) { 12419 d = mResources.getDrawable(resid); 12420 } 12421 setBackgroundDrawable(d); 12422 12423 mBackgroundResource = resid; 12424 } 12425 12426 /** 12427 * Set the background to a given Drawable, or remove the background. If the 12428 * background has padding, this View's padding is set to the background's 12429 * padding. However, when a background is removed, this View's padding isn't 12430 * touched. If setting the padding is desired, please use 12431 * {@link #setPadding(int, int, int, int)}. 12432 * 12433 * @param d The Drawable to use as the background, or null to remove the 12434 * background 12435 */ 12436 public void setBackgroundDrawable(Drawable d) { 12437 if (d == mBGDrawable) { 12438 return; 12439 } 12440 12441 boolean requestLayout = false; 12442 12443 mBackgroundResource = 0; 12444 12445 /* 12446 * Regardless of whether we're setting a new background or not, we want 12447 * to clear the previous drawable. 12448 */ 12449 if (mBGDrawable != null) { 12450 mBGDrawable.setCallback(null); 12451 unscheduleDrawable(mBGDrawable); 12452 } 12453 12454 if (d != null) { 12455 Rect padding = sThreadLocal.get(); 12456 if (padding == null) { 12457 padding = new Rect(); 12458 sThreadLocal.set(padding); 12459 } 12460 if (d.getPadding(padding)) { 12461 switch (d.getResolvedLayoutDirectionSelf()) { 12462 case LAYOUT_DIRECTION_RTL: 12463 setPadding(padding.right, padding.top, padding.left, padding.bottom); 12464 break; 12465 case LAYOUT_DIRECTION_LTR: 12466 default: 12467 setPadding(padding.left, padding.top, padding.right, padding.bottom); 12468 } 12469 } 12470 12471 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 12472 // if it has a different minimum size, we should layout again 12473 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 12474 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 12475 requestLayout = true; 12476 } 12477 12478 d.setCallback(this); 12479 if (d.isStateful()) { 12480 d.setState(getDrawableState()); 12481 } 12482 d.setVisible(getVisibility() == VISIBLE, false); 12483 mBGDrawable = d; 12484 12485 if ((mPrivateFlags & SKIP_DRAW) != 0) { 12486 mPrivateFlags &= ~SKIP_DRAW; 12487 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 12488 requestLayout = true; 12489 } 12490 } else { 12491 /* Remove the background */ 12492 mBGDrawable = null; 12493 12494 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 12495 /* 12496 * This view ONLY drew the background before and we're removing 12497 * the background, so now it won't draw anything 12498 * (hence we SKIP_DRAW) 12499 */ 12500 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 12501 mPrivateFlags |= SKIP_DRAW; 12502 } 12503 12504 /* 12505 * When the background is set, we try to apply its padding to this 12506 * View. When the background is removed, we don't touch this View's 12507 * padding. This is noted in the Javadocs. Hence, we don't need to 12508 * requestLayout(), the invalidate() below is sufficient. 12509 */ 12510 12511 // The old background's minimum size could have affected this 12512 // View's layout, so let's requestLayout 12513 requestLayout = true; 12514 } 12515 12516 computeOpaqueFlags(); 12517 12518 if (requestLayout) { 12519 requestLayout(); 12520 } 12521 12522 mBackgroundSizeChanged = true; 12523 invalidate(true); 12524 } 12525 12526 /** 12527 * Gets the background drawable 12528 * @return The drawable used as the background for this view, if any. 12529 */ 12530 public Drawable getBackground() { 12531 return mBGDrawable; 12532 } 12533 12534 /** 12535 * Sets the padding. The view may add on the space required to display 12536 * the scrollbars, depending on the style and visibility of the scrollbars. 12537 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 12538 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 12539 * from the values set in this call. 12540 * 12541 * @attr ref android.R.styleable#View_padding 12542 * @attr ref android.R.styleable#View_paddingBottom 12543 * @attr ref android.R.styleable#View_paddingLeft 12544 * @attr ref android.R.styleable#View_paddingRight 12545 * @attr ref android.R.styleable#View_paddingTop 12546 * @param left the left padding in pixels 12547 * @param top the top padding in pixels 12548 * @param right the right padding in pixels 12549 * @param bottom the bottom padding in pixels 12550 */ 12551 public void setPadding(int left, int top, int right, int bottom) { 12552 mUserPaddingStart = -1; 12553 mUserPaddingEnd = -1; 12554 mUserPaddingRelative = false; 12555 12556 internalSetPadding(left, top, right, bottom); 12557 } 12558 12559 private void internalSetPadding(int left, int top, int right, int bottom) { 12560 mUserPaddingLeft = left; 12561 mUserPaddingRight = right; 12562 mUserPaddingBottom = bottom; 12563 12564 final int viewFlags = mViewFlags; 12565 boolean changed = false; 12566 12567 // Common case is there are no scroll bars. 12568 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 12569 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 12570 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 12571 ? 0 : getVerticalScrollbarWidth(); 12572 switch (mVerticalScrollbarPosition) { 12573 case SCROLLBAR_POSITION_DEFAULT: 12574 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 12575 left += offset; 12576 } else { 12577 right += offset; 12578 } 12579 break; 12580 case SCROLLBAR_POSITION_RIGHT: 12581 right += offset; 12582 break; 12583 case SCROLLBAR_POSITION_LEFT: 12584 left += offset; 12585 break; 12586 } 12587 } 12588 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 12589 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 12590 ? 0 : getHorizontalScrollbarHeight(); 12591 } 12592 } 12593 12594 if (mPaddingLeft != left) { 12595 changed = true; 12596 mPaddingLeft = left; 12597 } 12598 if (mPaddingTop != top) { 12599 changed = true; 12600 mPaddingTop = top; 12601 } 12602 if (mPaddingRight != right) { 12603 changed = true; 12604 mPaddingRight = right; 12605 } 12606 if (mPaddingBottom != bottom) { 12607 changed = true; 12608 mPaddingBottom = bottom; 12609 } 12610 12611 if (changed) { 12612 requestLayout(); 12613 } 12614 } 12615 12616 /** 12617 * Sets the relative padding. The view may add on the space required to display 12618 * the scrollbars, depending on the style and visibility of the scrollbars. 12619 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 12620 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 12621 * from the values set in this call. 12622 * 12623 * @attr ref android.R.styleable#View_padding 12624 * @attr ref android.R.styleable#View_paddingBottom 12625 * @attr ref android.R.styleable#View_paddingStart 12626 * @attr ref android.R.styleable#View_paddingEnd 12627 * @attr ref android.R.styleable#View_paddingTop 12628 * @param start the start padding in pixels 12629 * @param top the top padding in pixels 12630 * @param end the end padding in pixels 12631 * @param bottom the bottom padding in pixels 12632 */ 12633 public void setPaddingRelative(int start, int top, int end, int bottom) { 12634 mUserPaddingStart = start; 12635 mUserPaddingEnd = end; 12636 mUserPaddingRelative = true; 12637 12638 switch(getResolvedLayoutDirection()) { 12639 case LAYOUT_DIRECTION_RTL: 12640 internalSetPadding(end, top, start, bottom); 12641 break; 12642 case LAYOUT_DIRECTION_LTR: 12643 default: 12644 internalSetPadding(start, top, end, bottom); 12645 } 12646 } 12647 12648 /** 12649 * Returns the top padding of this view. 12650 * 12651 * @return the top padding in pixels 12652 */ 12653 public int getPaddingTop() { 12654 return mPaddingTop; 12655 } 12656 12657 /** 12658 * Returns the bottom padding of this view. If there are inset and enabled 12659 * scrollbars, this value may include the space required to display the 12660 * scrollbars as well. 12661 * 12662 * @return the bottom padding in pixels 12663 */ 12664 public int getPaddingBottom() { 12665 return mPaddingBottom; 12666 } 12667 12668 /** 12669 * Returns the left padding of this view. If there are inset and enabled 12670 * scrollbars, this value may include the space required to display the 12671 * scrollbars as well. 12672 * 12673 * @return the left padding in pixels 12674 */ 12675 public int getPaddingLeft() { 12676 return mPaddingLeft; 12677 } 12678 12679 /** 12680 * Returns the start padding of this view depending on its resolved layout direction. 12681 * If there are inset and enabled scrollbars, this value may include the space 12682 * required to display the scrollbars as well. 12683 * 12684 * @return the start padding in pixels 12685 */ 12686 public int getPaddingStart() { 12687 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 12688 mPaddingRight : mPaddingLeft; 12689 } 12690 12691 /** 12692 * Returns the right padding of this view. If there are inset and enabled 12693 * scrollbars, this value may include the space required to display the 12694 * scrollbars as well. 12695 * 12696 * @return the right padding in pixels 12697 */ 12698 public int getPaddingRight() { 12699 return mPaddingRight; 12700 } 12701 12702 /** 12703 * Returns the end padding of this view depending on its resolved layout direction. 12704 * If there are inset and enabled scrollbars, this value may include the space 12705 * required to display the scrollbars as well. 12706 * 12707 * @return the end padding in pixels 12708 */ 12709 public int getPaddingEnd() { 12710 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 12711 mPaddingLeft : mPaddingRight; 12712 } 12713 12714 /** 12715 * Return if the padding as been set thru relative values 12716 * {@link #setPaddingRelative(int, int, int, int)} or thru 12717 * @attr ref android.R.styleable#View_paddingStart or 12718 * @attr ref android.R.styleable#View_paddingEnd 12719 * 12720 * @return true if the padding is relative or false if it is not. 12721 */ 12722 public boolean isPaddingRelative() { 12723 return mUserPaddingRelative; 12724 } 12725 12726 /** 12727 * Changes the selection state of this view. A view can be selected or not. 12728 * Note that selection is not the same as focus. Views are typically 12729 * selected in the context of an AdapterView like ListView or GridView; 12730 * the selected view is the view that is highlighted. 12731 * 12732 * @param selected true if the view must be selected, false otherwise 12733 */ 12734 public void setSelected(boolean selected) { 12735 if (((mPrivateFlags & SELECTED) != 0) != selected) { 12736 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 12737 if (!selected) resetPressedState(); 12738 invalidate(true); 12739 refreshDrawableState(); 12740 dispatchSetSelected(selected); 12741 } 12742 } 12743 12744 /** 12745 * Dispatch setSelected to all of this View's children. 12746 * 12747 * @see #setSelected(boolean) 12748 * 12749 * @param selected The new selected state 12750 */ 12751 protected void dispatchSetSelected(boolean selected) { 12752 } 12753 12754 /** 12755 * Indicates the selection state of this view. 12756 * 12757 * @return true if the view is selected, false otherwise 12758 */ 12759 @ViewDebug.ExportedProperty 12760 public boolean isSelected() { 12761 return (mPrivateFlags & SELECTED) != 0; 12762 } 12763 12764 /** 12765 * Changes the activated state of this view. A view can be activated or not. 12766 * Note that activation is not the same as selection. Selection is 12767 * a transient property, representing the view (hierarchy) the user is 12768 * currently interacting with. Activation is a longer-term state that the 12769 * user can move views in and out of. For example, in a list view with 12770 * single or multiple selection enabled, the views in the current selection 12771 * set are activated. (Um, yeah, we are deeply sorry about the terminology 12772 * here.) The activated state is propagated down to children of the view it 12773 * is set on. 12774 * 12775 * @param activated true if the view must be activated, false otherwise 12776 */ 12777 public void setActivated(boolean activated) { 12778 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 12779 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 12780 invalidate(true); 12781 refreshDrawableState(); 12782 dispatchSetActivated(activated); 12783 } 12784 } 12785 12786 /** 12787 * Dispatch setActivated to all of this View's children. 12788 * 12789 * @see #setActivated(boolean) 12790 * 12791 * @param activated The new activated state 12792 */ 12793 protected void dispatchSetActivated(boolean activated) { 12794 } 12795 12796 /** 12797 * Indicates the activation state of this view. 12798 * 12799 * @return true if the view is activated, false otherwise 12800 */ 12801 @ViewDebug.ExportedProperty 12802 public boolean isActivated() { 12803 return (mPrivateFlags & ACTIVATED) != 0; 12804 } 12805 12806 /** 12807 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 12808 * observer can be used to get notifications when global events, like 12809 * layout, happen. 12810 * 12811 * The returned ViewTreeObserver observer is not guaranteed to remain 12812 * valid for the lifetime of this View. If the caller of this method keeps 12813 * a long-lived reference to ViewTreeObserver, it should always check for 12814 * the return value of {@link ViewTreeObserver#isAlive()}. 12815 * 12816 * @return The ViewTreeObserver for this view's hierarchy. 12817 */ 12818 public ViewTreeObserver getViewTreeObserver() { 12819 if (mAttachInfo != null) { 12820 return mAttachInfo.mTreeObserver; 12821 } 12822 if (mFloatingTreeObserver == null) { 12823 mFloatingTreeObserver = new ViewTreeObserver(); 12824 } 12825 return mFloatingTreeObserver; 12826 } 12827 12828 /** 12829 * <p>Finds the topmost view in the current view hierarchy.</p> 12830 * 12831 * @return the topmost view containing this view 12832 */ 12833 public View getRootView() { 12834 if (mAttachInfo != null) { 12835 final View v = mAttachInfo.mRootView; 12836 if (v != null) { 12837 return v; 12838 } 12839 } 12840 12841 View parent = this; 12842 12843 while (parent.mParent != null && parent.mParent instanceof View) { 12844 parent = (View) parent.mParent; 12845 } 12846 12847 return parent; 12848 } 12849 12850 /** 12851 * <p>Computes the coordinates of this view on the screen. The argument 12852 * must be an array of two integers. After the method returns, the array 12853 * contains the x and y location in that order.</p> 12854 * 12855 * @param location an array of two integers in which to hold the coordinates 12856 */ 12857 public void getLocationOnScreen(int[] location) { 12858 getLocationInWindow(location); 12859 12860 final AttachInfo info = mAttachInfo; 12861 if (info != null) { 12862 location[0] += info.mWindowLeft; 12863 location[1] += info.mWindowTop; 12864 } 12865 } 12866 12867 /** 12868 * <p>Computes the coordinates of this view in its window. The argument 12869 * must be an array of two integers. After the method returns, the array 12870 * contains the x and y location in that order.</p> 12871 * 12872 * @param location an array of two integers in which to hold the coordinates 12873 */ 12874 public void getLocationInWindow(int[] location) { 12875 if (location == null || location.length < 2) { 12876 throw new IllegalArgumentException("location must be an array of two integers"); 12877 } 12878 12879 if (mAttachInfo == null) { 12880 // When the view is not attached to a window, this method does not make sense 12881 location[0] = location[1] = 0; 12882 return; 12883 } 12884 12885 float[] position = mAttachInfo.mTmpTransformLocation; 12886 position[0] = position[1] = 0.0f; 12887 12888 if (!hasIdentityMatrix()) { 12889 getMatrix().mapPoints(position); 12890 } 12891 12892 position[0] += mLeft; 12893 position[1] += mTop; 12894 12895 ViewParent viewParent = mParent; 12896 while (viewParent instanceof View) { 12897 final View view = (View) viewParent; 12898 12899 position[0] -= view.mScrollX; 12900 position[1] -= view.mScrollY; 12901 12902 if (!view.hasIdentityMatrix()) { 12903 view.getMatrix().mapPoints(position); 12904 } 12905 12906 position[0] += view.mLeft; 12907 position[1] += view.mTop; 12908 12909 viewParent = view.mParent; 12910 } 12911 12912 if (viewParent instanceof ViewRootImpl) { 12913 // *cough* 12914 final ViewRootImpl vr = (ViewRootImpl) viewParent; 12915 position[1] -= vr.mCurScrollY; 12916 } 12917 12918 location[0] = (int) (position[0] + 0.5f); 12919 location[1] = (int) (position[1] + 0.5f); 12920 } 12921 12922 /** 12923 * {@hide} 12924 * @param id the id of the view to be found 12925 * @return the view of the specified id, null if cannot be found 12926 */ 12927 protected View findViewTraversal(int id) { 12928 if (id == mID) { 12929 return this; 12930 } 12931 return null; 12932 } 12933 12934 /** 12935 * {@hide} 12936 * @param tag the tag of the view to be found 12937 * @return the view of specified tag, null if cannot be found 12938 */ 12939 protected View findViewWithTagTraversal(Object tag) { 12940 if (tag != null && tag.equals(mTag)) { 12941 return this; 12942 } 12943 return null; 12944 } 12945 12946 /** 12947 * {@hide} 12948 * @param predicate The predicate to evaluate. 12949 * @param childToSkip If not null, ignores this child during the recursive traversal. 12950 * @return The first view that matches the predicate or null. 12951 */ 12952 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 12953 if (predicate.apply(this)) { 12954 return this; 12955 } 12956 return null; 12957 } 12958 12959 /** 12960 * Look for a child view with the given id. If this view has the given 12961 * id, return this view. 12962 * 12963 * @param id The id to search for. 12964 * @return The view that has the given id in the hierarchy or null 12965 */ 12966 public final View findViewById(int id) { 12967 if (id < 0) { 12968 return null; 12969 } 12970 return findViewTraversal(id); 12971 } 12972 12973 /** 12974 * Finds a view by its unuque and stable accessibility id. 12975 * 12976 * @param accessibilityId The searched accessibility id. 12977 * @return The found view. 12978 */ 12979 final View findViewByAccessibilityId(int accessibilityId) { 12980 if (accessibilityId < 0) { 12981 return null; 12982 } 12983 return findViewByAccessibilityIdTraversal(accessibilityId); 12984 } 12985 12986 /** 12987 * Performs the traversal to find a view by its unuque and stable accessibility id. 12988 * 12989 * <strong>Note:</strong>This method does not stop at the root namespace 12990 * boundary since the user can touch the screen at an arbitrary location 12991 * potentially crossing the root namespace bounday which will send an 12992 * accessibility event to accessibility services and they should be able 12993 * to obtain the event source. Also accessibility ids are guaranteed to be 12994 * unique in the window. 12995 * 12996 * @param accessibilityId The accessibility id. 12997 * @return The found view. 12998 */ 12999 View findViewByAccessibilityIdTraversal(int accessibilityId) { 13000 if (getAccessibilityViewId() == accessibilityId) { 13001 return this; 13002 } 13003 return null; 13004 } 13005 13006 /** 13007 * Look for a child view with the given tag. If this view has the given 13008 * tag, return this view. 13009 * 13010 * @param tag The tag to search for, using "tag.equals(getTag())". 13011 * @return The View that has the given tag in the hierarchy or null 13012 */ 13013 public final View findViewWithTag(Object tag) { 13014 if (tag == null) { 13015 return null; 13016 } 13017 return findViewWithTagTraversal(tag); 13018 } 13019 13020 /** 13021 * {@hide} 13022 * Look for a child view that matches the specified predicate. 13023 * If this view matches the predicate, return this view. 13024 * 13025 * @param predicate The predicate to evaluate. 13026 * @return The first view that matches the predicate or null. 13027 */ 13028 public final View findViewByPredicate(Predicate<View> predicate) { 13029 return findViewByPredicateTraversal(predicate, null); 13030 } 13031 13032 /** 13033 * {@hide} 13034 * Look for a child view that matches the specified predicate, 13035 * starting with the specified view and its descendents and then 13036 * recusively searching the ancestors and siblings of that view 13037 * until this view is reached. 13038 * 13039 * This method is useful in cases where the predicate does not match 13040 * a single unique view (perhaps multiple views use the same id) 13041 * and we are trying to find the view that is "closest" in scope to the 13042 * starting view. 13043 * 13044 * @param start The view to start from. 13045 * @param predicate The predicate to evaluate. 13046 * @return The first view that matches the predicate or null. 13047 */ 13048 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 13049 View childToSkip = null; 13050 for (;;) { 13051 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 13052 if (view != null || start == this) { 13053 return view; 13054 } 13055 13056 ViewParent parent = start.getParent(); 13057 if (parent == null || !(parent instanceof View)) { 13058 return null; 13059 } 13060 13061 childToSkip = start; 13062 start = (View) parent; 13063 } 13064 } 13065 13066 /** 13067 * Sets the identifier for this view. The identifier does not have to be 13068 * unique in this view's hierarchy. The identifier should be a positive 13069 * number. 13070 * 13071 * @see #NO_ID 13072 * @see #getId() 13073 * @see #findViewById(int) 13074 * 13075 * @param id a number used to identify the view 13076 * 13077 * @attr ref android.R.styleable#View_id 13078 */ 13079 public void setId(int id) { 13080 mID = id; 13081 } 13082 13083 /** 13084 * {@hide} 13085 * 13086 * @param isRoot true if the view belongs to the root namespace, false 13087 * otherwise 13088 */ 13089 public void setIsRootNamespace(boolean isRoot) { 13090 if (isRoot) { 13091 mPrivateFlags |= IS_ROOT_NAMESPACE; 13092 } else { 13093 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 13094 } 13095 } 13096 13097 /** 13098 * {@hide} 13099 * 13100 * @return true if the view belongs to the root namespace, false otherwise 13101 */ 13102 public boolean isRootNamespace() { 13103 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 13104 } 13105 13106 /** 13107 * Returns this view's identifier. 13108 * 13109 * @return a positive integer used to identify the view or {@link #NO_ID} 13110 * if the view has no ID 13111 * 13112 * @see #setId(int) 13113 * @see #findViewById(int) 13114 * @attr ref android.R.styleable#View_id 13115 */ 13116 @ViewDebug.CapturedViewProperty 13117 public int getId() { 13118 return mID; 13119 } 13120 13121 /** 13122 * Returns this view's tag. 13123 * 13124 * @return the Object stored in this view as a tag 13125 * 13126 * @see #setTag(Object) 13127 * @see #getTag(int) 13128 */ 13129 @ViewDebug.ExportedProperty 13130 public Object getTag() { 13131 return mTag; 13132 } 13133 13134 /** 13135 * Sets the tag associated with this view. A tag can be used to mark 13136 * a view in its hierarchy and does not have to be unique within the 13137 * hierarchy. Tags can also be used to store data within a view without 13138 * resorting to another data structure. 13139 * 13140 * @param tag an Object to tag the view with 13141 * 13142 * @see #getTag() 13143 * @see #setTag(int, Object) 13144 */ 13145 public void setTag(final Object tag) { 13146 mTag = tag; 13147 } 13148 13149 /** 13150 * Returns the tag associated with this view and the specified key. 13151 * 13152 * @param key The key identifying the tag 13153 * 13154 * @return the Object stored in this view as a tag 13155 * 13156 * @see #setTag(int, Object) 13157 * @see #getTag() 13158 */ 13159 public Object getTag(int key) { 13160 if (mKeyedTags != null) return mKeyedTags.get(key); 13161 return null; 13162 } 13163 13164 /** 13165 * Sets a tag associated with this view and a key. A tag can be used 13166 * to mark a view in its hierarchy and does not have to be unique within 13167 * the hierarchy. Tags can also be used to store data within a view 13168 * without resorting to another data structure. 13169 * 13170 * The specified key should be an id declared in the resources of the 13171 * application to ensure it is unique (see the <a 13172 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 13173 * Keys identified as belonging to 13174 * the Android framework or not associated with any package will cause 13175 * an {@link IllegalArgumentException} to be thrown. 13176 * 13177 * @param key The key identifying the tag 13178 * @param tag An Object to tag the view with 13179 * 13180 * @throws IllegalArgumentException If they specified key is not valid 13181 * 13182 * @see #setTag(Object) 13183 * @see #getTag(int) 13184 */ 13185 public void setTag(int key, final Object tag) { 13186 // If the package id is 0x00 or 0x01, it's either an undefined package 13187 // or a framework id 13188 if ((key >>> 24) < 2) { 13189 throw new IllegalArgumentException("The key must be an application-specific " 13190 + "resource id."); 13191 } 13192 13193 setKeyedTag(key, tag); 13194 } 13195 13196 /** 13197 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 13198 * framework id. 13199 * 13200 * @hide 13201 */ 13202 public void setTagInternal(int key, Object tag) { 13203 if ((key >>> 24) != 0x1) { 13204 throw new IllegalArgumentException("The key must be a framework-specific " 13205 + "resource id."); 13206 } 13207 13208 setKeyedTag(key, tag); 13209 } 13210 13211 private void setKeyedTag(int key, Object tag) { 13212 if (mKeyedTags == null) { 13213 mKeyedTags = new SparseArray<Object>(); 13214 } 13215 13216 mKeyedTags.put(key, tag); 13217 } 13218 13219 /** 13220 * @param consistency The type of consistency. See ViewDebug for more information. 13221 * 13222 * @hide 13223 */ 13224 protected boolean dispatchConsistencyCheck(int consistency) { 13225 return onConsistencyCheck(consistency); 13226 } 13227 13228 /** 13229 * Method that subclasses should implement to check their consistency. The type of 13230 * consistency check is indicated by the bit field passed as a parameter. 13231 * 13232 * @param consistency The type of consistency. See ViewDebug for more information. 13233 * 13234 * @throws IllegalStateException if the view is in an inconsistent state. 13235 * 13236 * @hide 13237 */ 13238 protected boolean onConsistencyCheck(int consistency) { 13239 boolean result = true; 13240 13241 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 13242 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 13243 13244 if (checkLayout) { 13245 if (getParent() == null) { 13246 result = false; 13247 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 13248 "View " + this + " does not have a parent."); 13249 } 13250 13251 if (mAttachInfo == null) { 13252 result = false; 13253 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 13254 "View " + this + " is not attached to a window."); 13255 } 13256 } 13257 13258 if (checkDrawing) { 13259 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 13260 // from their draw() method 13261 13262 if ((mPrivateFlags & DRAWN) != DRAWN && 13263 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 13264 result = false; 13265 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 13266 "View " + this + " was invalidated but its drawing cache is valid."); 13267 } 13268 } 13269 13270 return result; 13271 } 13272 13273 /** 13274 * Prints information about this view in the log output, with the tag 13275 * {@link #VIEW_LOG_TAG}. 13276 * 13277 * @hide 13278 */ 13279 public void debug() { 13280 debug(0); 13281 } 13282 13283 /** 13284 * Prints information about this view in the log output, with the tag 13285 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 13286 * indentation defined by the <code>depth</code>. 13287 * 13288 * @param depth the indentation level 13289 * 13290 * @hide 13291 */ 13292 protected void debug(int depth) { 13293 String output = debugIndent(depth - 1); 13294 13295 output += "+ " + this; 13296 int id = getId(); 13297 if (id != -1) { 13298 output += " (id=" + id + ")"; 13299 } 13300 Object tag = getTag(); 13301 if (tag != null) { 13302 output += " (tag=" + tag + ")"; 13303 } 13304 Log.d(VIEW_LOG_TAG, output); 13305 13306 if ((mPrivateFlags & FOCUSED) != 0) { 13307 output = debugIndent(depth) + " FOCUSED"; 13308 Log.d(VIEW_LOG_TAG, output); 13309 } 13310 13311 output = debugIndent(depth); 13312 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 13313 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 13314 + "} "; 13315 Log.d(VIEW_LOG_TAG, output); 13316 13317 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 13318 || mPaddingBottom != 0) { 13319 output = debugIndent(depth); 13320 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 13321 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 13322 Log.d(VIEW_LOG_TAG, output); 13323 } 13324 13325 output = debugIndent(depth); 13326 output += "mMeasureWidth=" + mMeasuredWidth + 13327 " mMeasureHeight=" + mMeasuredHeight; 13328 Log.d(VIEW_LOG_TAG, output); 13329 13330 output = debugIndent(depth); 13331 if (mLayoutParams == null) { 13332 output += "BAD! no layout params"; 13333 } else { 13334 output = mLayoutParams.debug(output); 13335 } 13336 Log.d(VIEW_LOG_TAG, output); 13337 13338 output = debugIndent(depth); 13339 output += "flags={"; 13340 output += View.printFlags(mViewFlags); 13341 output += "}"; 13342 Log.d(VIEW_LOG_TAG, output); 13343 13344 output = debugIndent(depth); 13345 output += "privateFlags={"; 13346 output += View.printPrivateFlags(mPrivateFlags); 13347 output += "}"; 13348 Log.d(VIEW_LOG_TAG, output); 13349 } 13350 13351 /** 13352 * Creates a string of whitespaces used for indentation. 13353 * 13354 * @param depth the indentation level 13355 * @return a String containing (depth * 2 + 3) * 2 white spaces 13356 * 13357 * @hide 13358 */ 13359 protected static String debugIndent(int depth) { 13360 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 13361 for (int i = 0; i < (depth * 2) + 3; i++) { 13362 spaces.append(' ').append(' '); 13363 } 13364 return spaces.toString(); 13365 } 13366 13367 /** 13368 * <p>Return the offset of the widget's text baseline from the widget's top 13369 * boundary. If this widget does not support baseline alignment, this 13370 * method returns -1. </p> 13371 * 13372 * @return the offset of the baseline within the widget's bounds or -1 13373 * if baseline alignment is not supported 13374 */ 13375 @ViewDebug.ExportedProperty(category = "layout") 13376 public int getBaseline() { 13377 return -1; 13378 } 13379 13380 /** 13381 * Call this when something has changed which has invalidated the 13382 * layout of this view. This will schedule a layout pass of the view 13383 * tree. 13384 */ 13385 public void requestLayout() { 13386 if (ViewDebug.TRACE_HIERARCHY) { 13387 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 13388 } 13389 13390 mPrivateFlags |= FORCE_LAYOUT; 13391 mPrivateFlags |= INVALIDATED; 13392 13393 if (mParent != null) { 13394 if (mLayoutParams != null) { 13395 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 13396 } 13397 if (!mParent.isLayoutRequested()) { 13398 mParent.requestLayout(); 13399 } 13400 } 13401 } 13402 13403 /** 13404 * Forces this view to be laid out during the next layout pass. 13405 * This method does not call requestLayout() or forceLayout() 13406 * on the parent. 13407 */ 13408 public void forceLayout() { 13409 mPrivateFlags |= FORCE_LAYOUT; 13410 mPrivateFlags |= INVALIDATED; 13411 } 13412 13413 /** 13414 * <p> 13415 * This is called to find out how big a view should be. The parent 13416 * supplies constraint information in the width and height parameters. 13417 * </p> 13418 * 13419 * <p> 13420 * The actual measurement work of a view is performed in 13421 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 13422 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 13423 * </p> 13424 * 13425 * 13426 * @param widthMeasureSpec Horizontal space requirements as imposed by the 13427 * parent 13428 * @param heightMeasureSpec Vertical space requirements as imposed by the 13429 * parent 13430 * 13431 * @see #onMeasure(int, int) 13432 */ 13433 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 13434 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 13435 widthMeasureSpec != mOldWidthMeasureSpec || 13436 heightMeasureSpec != mOldHeightMeasureSpec) { 13437 13438 // first clears the measured dimension flag 13439 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 13440 13441 if (ViewDebug.TRACE_HIERARCHY) { 13442 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 13443 } 13444 13445 // measure ourselves, this should set the measured dimension flag back 13446 onMeasure(widthMeasureSpec, heightMeasureSpec); 13447 13448 // flag not set, setMeasuredDimension() was not invoked, we raise 13449 // an exception to warn the developer 13450 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 13451 throw new IllegalStateException("onMeasure() did not set the" 13452 + " measured dimension by calling" 13453 + " setMeasuredDimension()"); 13454 } 13455 13456 mPrivateFlags |= LAYOUT_REQUIRED; 13457 } 13458 13459 mOldWidthMeasureSpec = widthMeasureSpec; 13460 mOldHeightMeasureSpec = heightMeasureSpec; 13461 } 13462 13463 /** 13464 * <p> 13465 * Measure the view and its content to determine the measured width and the 13466 * measured height. This method is invoked by {@link #measure(int, int)} and 13467 * should be overriden by subclasses to provide accurate and efficient 13468 * measurement of their contents. 13469 * </p> 13470 * 13471 * <p> 13472 * <strong>CONTRACT:</strong> When overriding this method, you 13473 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 13474 * measured width and height of this view. Failure to do so will trigger an 13475 * <code>IllegalStateException</code>, thrown by 13476 * {@link #measure(int, int)}. Calling the superclass' 13477 * {@link #onMeasure(int, int)} is a valid use. 13478 * </p> 13479 * 13480 * <p> 13481 * The base class implementation of measure defaults to the background size, 13482 * unless a larger size is allowed by the MeasureSpec. Subclasses should 13483 * override {@link #onMeasure(int, int)} to provide better measurements of 13484 * their content. 13485 * </p> 13486 * 13487 * <p> 13488 * If this method is overridden, it is the subclass's responsibility to make 13489 * sure the measured height and width are at least the view's minimum height 13490 * and width ({@link #getSuggestedMinimumHeight()} and 13491 * {@link #getSuggestedMinimumWidth()}). 13492 * </p> 13493 * 13494 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 13495 * The requirements are encoded with 13496 * {@link android.view.View.MeasureSpec}. 13497 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 13498 * The requirements are encoded with 13499 * {@link android.view.View.MeasureSpec}. 13500 * 13501 * @see #getMeasuredWidth() 13502 * @see #getMeasuredHeight() 13503 * @see #setMeasuredDimension(int, int) 13504 * @see #getSuggestedMinimumHeight() 13505 * @see #getSuggestedMinimumWidth() 13506 * @see android.view.View.MeasureSpec#getMode(int) 13507 * @see android.view.View.MeasureSpec#getSize(int) 13508 */ 13509 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 13510 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 13511 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 13512 } 13513 13514 /** 13515 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 13516 * measured width and measured height. Failing to do so will trigger an 13517 * exception at measurement time.</p> 13518 * 13519 * @param measuredWidth The measured width of this view. May be a complex 13520 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 13521 * {@link #MEASURED_STATE_TOO_SMALL}. 13522 * @param measuredHeight The measured height of this view. May be a complex 13523 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 13524 * {@link #MEASURED_STATE_TOO_SMALL}. 13525 */ 13526 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 13527 mMeasuredWidth = measuredWidth; 13528 mMeasuredHeight = measuredHeight; 13529 13530 mPrivateFlags |= MEASURED_DIMENSION_SET; 13531 } 13532 13533 /** 13534 * Merge two states as returned by {@link #getMeasuredState()}. 13535 * @param curState The current state as returned from a view or the result 13536 * of combining multiple views. 13537 * @param newState The new view state to combine. 13538 * @return Returns a new integer reflecting the combination of the two 13539 * states. 13540 */ 13541 public static int combineMeasuredStates(int curState, int newState) { 13542 return curState | newState; 13543 } 13544 13545 /** 13546 * Version of {@link #resolveSizeAndState(int, int, int)} 13547 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 13548 */ 13549 public static int resolveSize(int size, int measureSpec) { 13550 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 13551 } 13552 13553 /** 13554 * Utility to reconcile a desired size and state, with constraints imposed 13555 * by a MeasureSpec. Will take the desired size, unless a different size 13556 * is imposed by the constraints. The returned value is a compound integer, 13557 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 13558 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 13559 * size is smaller than the size the view wants to be. 13560 * 13561 * @param size How big the view wants to be 13562 * @param measureSpec Constraints imposed by the parent 13563 * @return Size information bit mask as defined by 13564 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 13565 */ 13566 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 13567 int result = size; 13568 int specMode = MeasureSpec.getMode(measureSpec); 13569 int specSize = MeasureSpec.getSize(measureSpec); 13570 switch (specMode) { 13571 case MeasureSpec.UNSPECIFIED: 13572 result = size; 13573 break; 13574 case MeasureSpec.AT_MOST: 13575 if (specSize < size) { 13576 result = specSize | MEASURED_STATE_TOO_SMALL; 13577 } else { 13578 result = size; 13579 } 13580 break; 13581 case MeasureSpec.EXACTLY: 13582 result = specSize; 13583 break; 13584 } 13585 return result | (childMeasuredState&MEASURED_STATE_MASK); 13586 } 13587 13588 /** 13589 * Utility to return a default size. Uses the supplied size if the 13590 * MeasureSpec imposed no constraints. Will get larger if allowed 13591 * by the MeasureSpec. 13592 * 13593 * @param size Default size for this view 13594 * @param measureSpec Constraints imposed by the parent 13595 * @return The size this view should be. 13596 */ 13597 public static int getDefaultSize(int size, int measureSpec) { 13598 int result = size; 13599 int specMode = MeasureSpec.getMode(measureSpec); 13600 int specSize = MeasureSpec.getSize(measureSpec); 13601 13602 switch (specMode) { 13603 case MeasureSpec.UNSPECIFIED: 13604 result = size; 13605 break; 13606 case MeasureSpec.AT_MOST: 13607 case MeasureSpec.EXACTLY: 13608 result = specSize; 13609 break; 13610 } 13611 return result; 13612 } 13613 13614 /** 13615 * Returns the suggested minimum height that the view should use. This 13616 * returns the maximum of the view's minimum height 13617 * and the background's minimum height 13618 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 13619 * <p> 13620 * When being used in {@link #onMeasure(int, int)}, the caller should still 13621 * ensure the returned height is within the requirements of the parent. 13622 * 13623 * @return The suggested minimum height of the view. 13624 */ 13625 protected int getSuggestedMinimumHeight() { 13626 int suggestedMinHeight = mMinHeight; 13627 13628 if (mBGDrawable != null) { 13629 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 13630 if (suggestedMinHeight < bgMinHeight) { 13631 suggestedMinHeight = bgMinHeight; 13632 } 13633 } 13634 13635 return suggestedMinHeight; 13636 } 13637 13638 /** 13639 * Returns the suggested minimum width that the view should use. This 13640 * returns the maximum of the view's minimum width) 13641 * and the background's minimum width 13642 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 13643 * <p> 13644 * When being used in {@link #onMeasure(int, int)}, the caller should still 13645 * ensure the returned width is within the requirements of the parent. 13646 * 13647 * @return The suggested minimum width of the view. 13648 */ 13649 protected int getSuggestedMinimumWidth() { 13650 int suggestedMinWidth = mMinWidth; 13651 13652 if (mBGDrawable != null) { 13653 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 13654 if (suggestedMinWidth < bgMinWidth) { 13655 suggestedMinWidth = bgMinWidth; 13656 } 13657 } 13658 13659 return suggestedMinWidth; 13660 } 13661 13662 /** 13663 * Sets the minimum height of the view. It is not guaranteed the view will 13664 * be able to achieve this minimum height (for example, if its parent layout 13665 * constrains it with less available height). 13666 * 13667 * @param minHeight The minimum height the view will try to be. 13668 */ 13669 public void setMinimumHeight(int minHeight) { 13670 mMinHeight = minHeight; 13671 } 13672 13673 /** 13674 * Sets the minimum width of the view. It is not guaranteed the view will 13675 * be able to achieve this minimum width (for example, if its parent layout 13676 * constrains it with less available width). 13677 * 13678 * @param minWidth The minimum width the view will try to be. 13679 */ 13680 public void setMinimumWidth(int minWidth) { 13681 mMinWidth = minWidth; 13682 } 13683 13684 /** 13685 * Get the animation currently associated with this view. 13686 * 13687 * @return The animation that is currently playing or 13688 * scheduled to play for this view. 13689 */ 13690 public Animation getAnimation() { 13691 return mCurrentAnimation; 13692 } 13693 13694 /** 13695 * Start the specified animation now. 13696 * 13697 * @param animation the animation to start now 13698 */ 13699 public void startAnimation(Animation animation) { 13700 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 13701 setAnimation(animation); 13702 invalidateParentCaches(); 13703 invalidate(true); 13704 } 13705 13706 /** 13707 * Cancels any animations for this view. 13708 */ 13709 public void clearAnimation() { 13710 if (mCurrentAnimation != null) { 13711 mCurrentAnimation.detach(); 13712 } 13713 mCurrentAnimation = null; 13714 invalidateParentIfNeeded(); 13715 } 13716 13717 /** 13718 * Sets the next animation to play for this view. 13719 * If you want the animation to play immediately, use 13720 * startAnimation. This method provides allows fine-grained 13721 * control over the start time and invalidation, but you 13722 * must make sure that 1) the animation has a start time set, and 13723 * 2) the view will be invalidated when the animation is supposed to 13724 * start. 13725 * 13726 * @param animation The next animation, or null. 13727 */ 13728 public void setAnimation(Animation animation) { 13729 mCurrentAnimation = animation; 13730 if (animation != null) { 13731 animation.reset(); 13732 } 13733 } 13734 13735 /** 13736 * Invoked by a parent ViewGroup to notify the start of the animation 13737 * currently associated with this view. If you override this method, 13738 * always call super.onAnimationStart(); 13739 * 13740 * @see #setAnimation(android.view.animation.Animation) 13741 * @see #getAnimation() 13742 */ 13743 protected void onAnimationStart() { 13744 mPrivateFlags |= ANIMATION_STARTED; 13745 } 13746 13747 /** 13748 * Invoked by a parent ViewGroup to notify the end of the animation 13749 * currently associated with this view. If you override this method, 13750 * always call super.onAnimationEnd(); 13751 * 13752 * @see #setAnimation(android.view.animation.Animation) 13753 * @see #getAnimation() 13754 */ 13755 protected void onAnimationEnd() { 13756 mPrivateFlags &= ~ANIMATION_STARTED; 13757 } 13758 13759 /** 13760 * Invoked if there is a Transform that involves alpha. Subclass that can 13761 * draw themselves with the specified alpha should return true, and then 13762 * respect that alpha when their onDraw() is called. If this returns false 13763 * then the view may be redirected to draw into an offscreen buffer to 13764 * fulfill the request, which will look fine, but may be slower than if the 13765 * subclass handles it internally. The default implementation returns false. 13766 * 13767 * @param alpha The alpha (0..255) to apply to the view's drawing 13768 * @return true if the view can draw with the specified alpha. 13769 */ 13770 protected boolean onSetAlpha(int alpha) { 13771 return false; 13772 } 13773 13774 /** 13775 * This is used by the RootView to perform an optimization when 13776 * the view hierarchy contains one or several SurfaceView. 13777 * SurfaceView is always considered transparent, but its children are not, 13778 * therefore all View objects remove themselves from the global transparent 13779 * region (passed as a parameter to this function). 13780 * 13781 * @param region The transparent region for this ViewAncestor (window). 13782 * 13783 * @return Returns true if the effective visibility of the view at this 13784 * point is opaque, regardless of the transparent region; returns false 13785 * if it is possible for underlying windows to be seen behind the view. 13786 * 13787 * {@hide} 13788 */ 13789 public boolean gatherTransparentRegion(Region region) { 13790 final AttachInfo attachInfo = mAttachInfo; 13791 if (region != null && attachInfo != null) { 13792 final int pflags = mPrivateFlags; 13793 if ((pflags & SKIP_DRAW) == 0) { 13794 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 13795 // remove it from the transparent region. 13796 final int[] location = attachInfo.mTransparentLocation; 13797 getLocationInWindow(location); 13798 region.op(location[0], location[1], location[0] + mRight - mLeft, 13799 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 13800 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 13801 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 13802 // exists, so we remove the background drawable's non-transparent 13803 // parts from this transparent region. 13804 applyDrawableToTransparentRegion(mBGDrawable, region); 13805 } 13806 } 13807 return true; 13808 } 13809 13810 /** 13811 * Play a sound effect for this view. 13812 * 13813 * <p>The framework will play sound effects for some built in actions, such as 13814 * clicking, but you may wish to play these effects in your widget, 13815 * for instance, for internal navigation. 13816 * 13817 * <p>The sound effect will only be played if sound effects are enabled by the user, and 13818 * {@link #isSoundEffectsEnabled()} is true. 13819 * 13820 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 13821 */ 13822 public void playSoundEffect(int soundConstant) { 13823 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 13824 return; 13825 } 13826 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 13827 } 13828 13829 /** 13830 * BZZZTT!!1! 13831 * 13832 * <p>Provide haptic feedback to the user for this view. 13833 * 13834 * <p>The framework will provide haptic feedback for some built in actions, 13835 * such as long presses, but you may wish to provide feedback for your 13836 * own widget. 13837 * 13838 * <p>The feedback will only be performed if 13839 * {@link #isHapticFeedbackEnabled()} is true. 13840 * 13841 * @param feedbackConstant One of the constants defined in 13842 * {@link HapticFeedbackConstants} 13843 */ 13844 public boolean performHapticFeedback(int feedbackConstant) { 13845 return performHapticFeedback(feedbackConstant, 0); 13846 } 13847 13848 /** 13849 * BZZZTT!!1! 13850 * 13851 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 13852 * 13853 * @param feedbackConstant One of the constants defined in 13854 * {@link HapticFeedbackConstants} 13855 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 13856 */ 13857 public boolean performHapticFeedback(int feedbackConstant, int flags) { 13858 if (mAttachInfo == null) { 13859 return false; 13860 } 13861 //noinspection SimplifiableIfStatement 13862 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 13863 && !isHapticFeedbackEnabled()) { 13864 return false; 13865 } 13866 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 13867 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 13868 } 13869 13870 /** 13871 * Request that the visibility of the status bar be changed. 13872 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13873 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13874 */ 13875 public void setSystemUiVisibility(int visibility) { 13876 if (visibility != mSystemUiVisibility) { 13877 mSystemUiVisibility = visibility; 13878 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 13879 mParent.recomputeViewAttributes(this); 13880 } 13881 } 13882 } 13883 13884 /** 13885 * Returns the status bar visibility that this view has requested. 13886 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13887 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13888 */ 13889 public int getSystemUiVisibility() { 13890 return mSystemUiVisibility; 13891 } 13892 13893 /** 13894 * Set a listener to receive callbacks when the visibility of the system bar changes. 13895 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 13896 */ 13897 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 13898 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 13899 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 13900 mParent.recomputeViewAttributes(this); 13901 } 13902 } 13903 13904 /** 13905 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 13906 * the view hierarchy. 13907 */ 13908 public void dispatchSystemUiVisibilityChanged(int visibility) { 13909 ListenerInfo li = mListenerInfo; 13910 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 13911 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 13912 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 13913 } 13914 } 13915 13916 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 13917 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 13918 if (val != mSystemUiVisibility) { 13919 setSystemUiVisibility(val); 13920 } 13921 } 13922 13923 /** 13924 * Creates an image that the system displays during the drag and drop 13925 * operation. This is called a "drag shadow". The default implementation 13926 * for a DragShadowBuilder based on a View returns an image that has exactly the same 13927 * appearance as the given View. The default also positions the center of the drag shadow 13928 * directly under the touch point. If no View is provided (the constructor with no parameters 13929 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 13930 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 13931 * default is an invisible drag shadow. 13932 * <p> 13933 * You are not required to use the View you provide to the constructor as the basis of the 13934 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 13935 * anything you want as the drag shadow. 13936 * </p> 13937 * <p> 13938 * You pass a DragShadowBuilder object to the system when you start the drag. The system 13939 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 13940 * size and position of the drag shadow. It uses this data to construct a 13941 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 13942 * so that your application can draw the shadow image in the Canvas. 13943 * </p> 13944 * 13945 * <div class="special reference"> 13946 * <h3>Developer Guides</h3> 13947 * <p>For a guide to implementing drag and drop features, read the 13948 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 13949 * </div> 13950 */ 13951 public static class DragShadowBuilder { 13952 private final WeakReference<View> mView; 13953 13954 /** 13955 * Constructs a shadow image builder based on a View. By default, the resulting drag 13956 * shadow will have the same appearance and dimensions as the View, with the touch point 13957 * over the center of the View. 13958 * @param view A View. Any View in scope can be used. 13959 */ 13960 public DragShadowBuilder(View view) { 13961 mView = new WeakReference<View>(view); 13962 } 13963 13964 /** 13965 * Construct a shadow builder object with no associated View. This 13966 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 13967 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 13968 * to supply the drag shadow's dimensions and appearance without 13969 * reference to any View object. If they are not overridden, then the result is an 13970 * invisible drag shadow. 13971 */ 13972 public DragShadowBuilder() { 13973 mView = new WeakReference<View>(null); 13974 } 13975 13976 /** 13977 * Returns the View object that had been passed to the 13978 * {@link #View.DragShadowBuilder(View)} 13979 * constructor. If that View parameter was {@code null} or if the 13980 * {@link #View.DragShadowBuilder()} 13981 * constructor was used to instantiate the builder object, this method will return 13982 * null. 13983 * 13984 * @return The View object associate with this builder object. 13985 */ 13986 @SuppressWarnings({"JavadocReference"}) 13987 final public View getView() { 13988 return mView.get(); 13989 } 13990 13991 /** 13992 * Provides the metrics for the shadow image. These include the dimensions of 13993 * the shadow image, and the point within that shadow that should 13994 * be centered under the touch location while dragging. 13995 * <p> 13996 * The default implementation sets the dimensions of the shadow to be the 13997 * same as the dimensions of the View itself and centers the shadow under 13998 * the touch point. 13999 * </p> 14000 * 14001 * @param shadowSize A {@link android.graphics.Point} containing the width and height 14002 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 14003 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 14004 * image. 14005 * 14006 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 14007 * shadow image that should be underneath the touch point during the drag and drop 14008 * operation. Your application must set {@link android.graphics.Point#x} to the 14009 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 14010 */ 14011 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 14012 final View view = mView.get(); 14013 if (view != null) { 14014 shadowSize.set(view.getWidth(), view.getHeight()); 14015 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 14016 } else { 14017 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 14018 } 14019 } 14020 14021 /** 14022 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 14023 * based on the dimensions it received from the 14024 * {@link #onProvideShadowMetrics(Point, Point)} callback. 14025 * 14026 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 14027 */ 14028 public void onDrawShadow(Canvas canvas) { 14029 final View view = mView.get(); 14030 if (view != null) { 14031 view.draw(canvas); 14032 } else { 14033 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 14034 } 14035 } 14036 } 14037 14038 /** 14039 * Starts a drag and drop operation. When your application calls this method, it passes a 14040 * {@link android.view.View.DragShadowBuilder} object to the system. The 14041 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 14042 * to get metrics for the drag shadow, and then calls the object's 14043 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 14044 * <p> 14045 * Once the system has the drag shadow, it begins the drag and drop operation by sending 14046 * drag events to all the View objects in your application that are currently visible. It does 14047 * this either by calling the View object's drag listener (an implementation of 14048 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 14049 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 14050 * Both are passed a {@link android.view.DragEvent} object that has a 14051 * {@link android.view.DragEvent#getAction()} value of 14052 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 14053 * </p> 14054 * <p> 14055 * Your application can invoke startDrag() on any attached View object. The View object does not 14056 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 14057 * be related to the View the user selected for dragging. 14058 * </p> 14059 * @param data A {@link android.content.ClipData} object pointing to the data to be 14060 * transferred by the drag and drop operation. 14061 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 14062 * drag shadow. 14063 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 14064 * drop operation. This Object is put into every DragEvent object sent by the system during the 14065 * current drag. 14066 * <p> 14067 * myLocalState is a lightweight mechanism for the sending information from the dragged View 14068 * to the target Views. For example, it can contain flags that differentiate between a 14069 * a copy operation and a move operation. 14070 * </p> 14071 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 14072 * so the parameter should be set to 0. 14073 * @return {@code true} if the method completes successfully, or 14074 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 14075 * do a drag, and so no drag operation is in progress. 14076 */ 14077 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 14078 Object myLocalState, int flags) { 14079 if (ViewDebug.DEBUG_DRAG) { 14080 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 14081 } 14082 boolean okay = false; 14083 14084 Point shadowSize = new Point(); 14085 Point shadowTouchPoint = new Point(); 14086 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 14087 14088 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 14089 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 14090 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 14091 } 14092 14093 if (ViewDebug.DEBUG_DRAG) { 14094 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 14095 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 14096 } 14097 Surface surface = new Surface(); 14098 try { 14099 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 14100 flags, shadowSize.x, shadowSize.y, surface); 14101 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 14102 + " surface=" + surface); 14103 if (token != null) { 14104 Canvas canvas = surface.lockCanvas(null); 14105 try { 14106 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 14107 shadowBuilder.onDrawShadow(canvas); 14108 } finally { 14109 surface.unlockCanvasAndPost(canvas); 14110 } 14111 14112 final ViewRootImpl root = getViewRootImpl(); 14113 14114 // Cache the local state object for delivery with DragEvents 14115 root.setLocalDragState(myLocalState); 14116 14117 // repurpose 'shadowSize' for the last touch point 14118 root.getLastTouchPoint(shadowSize); 14119 14120 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 14121 shadowSize.x, shadowSize.y, 14122 shadowTouchPoint.x, shadowTouchPoint.y, data); 14123 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 14124 14125 // Off and running! Release our local surface instance; the drag 14126 // shadow surface is now managed by the system process. 14127 surface.release(); 14128 } 14129 } catch (Exception e) { 14130 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 14131 surface.destroy(); 14132 } 14133 14134 return okay; 14135 } 14136 14137 /** 14138 * Handles drag events sent by the system following a call to 14139 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 14140 *<p> 14141 * When the system calls this method, it passes a 14142 * {@link android.view.DragEvent} object. A call to 14143 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 14144 * in DragEvent. The method uses these to determine what is happening in the drag and drop 14145 * operation. 14146 * @param event The {@link android.view.DragEvent} sent by the system. 14147 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 14148 * in DragEvent, indicating the type of drag event represented by this object. 14149 * @return {@code true} if the method was successful, otherwise {@code false}. 14150 * <p> 14151 * The method should return {@code true} in response to an action type of 14152 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 14153 * operation. 14154 * </p> 14155 * <p> 14156 * The method should also return {@code true} in response to an action type of 14157 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 14158 * {@code false} if it didn't. 14159 * </p> 14160 */ 14161 public boolean onDragEvent(DragEvent event) { 14162 return false; 14163 } 14164 14165 /** 14166 * Detects if this View is enabled and has a drag event listener. 14167 * If both are true, then it calls the drag event listener with the 14168 * {@link android.view.DragEvent} it received. If the drag event listener returns 14169 * {@code true}, then dispatchDragEvent() returns {@code true}. 14170 * <p> 14171 * For all other cases, the method calls the 14172 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 14173 * method and returns its result. 14174 * </p> 14175 * <p> 14176 * This ensures that a drag event is always consumed, even if the View does not have a drag 14177 * event listener. However, if the View has a listener and the listener returns true, then 14178 * onDragEvent() is not called. 14179 * </p> 14180 */ 14181 public boolean dispatchDragEvent(DragEvent event) { 14182 //noinspection SimplifiableIfStatement 14183 ListenerInfo li = mListenerInfo; 14184 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 14185 && li.mOnDragListener.onDrag(this, event)) { 14186 return true; 14187 } 14188 return onDragEvent(event); 14189 } 14190 14191 boolean canAcceptDrag() { 14192 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 14193 } 14194 14195 /** 14196 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 14197 * it is ever exposed at all. 14198 * @hide 14199 */ 14200 public void onCloseSystemDialogs(String reason) { 14201 } 14202 14203 /** 14204 * Given a Drawable whose bounds have been set to draw into this view, 14205 * update a Region being computed for 14206 * {@link #gatherTransparentRegion(android.graphics.Region)} so 14207 * that any non-transparent parts of the Drawable are removed from the 14208 * given transparent region. 14209 * 14210 * @param dr The Drawable whose transparency is to be applied to the region. 14211 * @param region A Region holding the current transparency information, 14212 * where any parts of the region that are set are considered to be 14213 * transparent. On return, this region will be modified to have the 14214 * transparency information reduced by the corresponding parts of the 14215 * Drawable that are not transparent. 14216 * {@hide} 14217 */ 14218 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 14219 if (DBG) { 14220 Log.i("View", "Getting transparent region for: " + this); 14221 } 14222 final Region r = dr.getTransparentRegion(); 14223 final Rect db = dr.getBounds(); 14224 final AttachInfo attachInfo = mAttachInfo; 14225 if (r != null && attachInfo != null) { 14226 final int w = getRight()-getLeft(); 14227 final int h = getBottom()-getTop(); 14228 if (db.left > 0) { 14229 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 14230 r.op(0, 0, db.left, h, Region.Op.UNION); 14231 } 14232 if (db.right < w) { 14233 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 14234 r.op(db.right, 0, w, h, Region.Op.UNION); 14235 } 14236 if (db.top > 0) { 14237 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 14238 r.op(0, 0, w, db.top, Region.Op.UNION); 14239 } 14240 if (db.bottom < h) { 14241 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 14242 r.op(0, db.bottom, w, h, Region.Op.UNION); 14243 } 14244 final int[] location = attachInfo.mTransparentLocation; 14245 getLocationInWindow(location); 14246 r.translate(location[0], location[1]); 14247 region.op(r, Region.Op.INTERSECT); 14248 } else { 14249 region.op(db, Region.Op.DIFFERENCE); 14250 } 14251 } 14252 14253 private void checkForLongClick(int delayOffset) { 14254 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 14255 mHasPerformedLongPress = false; 14256 14257 if (mPendingCheckForLongPress == null) { 14258 mPendingCheckForLongPress = new CheckForLongPress(); 14259 } 14260 mPendingCheckForLongPress.rememberWindowAttachCount(); 14261 postDelayed(mPendingCheckForLongPress, 14262 ViewConfiguration.getLongPressTimeout() - delayOffset); 14263 } 14264 } 14265 14266 /** 14267 * Inflate a view from an XML resource. This convenience method wraps the {@link 14268 * LayoutInflater} class, which provides a full range of options for view inflation. 14269 * 14270 * @param context The Context object for your activity or application. 14271 * @param resource The resource ID to inflate 14272 * @param root A view group that will be the parent. Used to properly inflate the 14273 * layout_* parameters. 14274 * @see LayoutInflater 14275 */ 14276 public static View inflate(Context context, int resource, ViewGroup root) { 14277 LayoutInflater factory = LayoutInflater.from(context); 14278 return factory.inflate(resource, root); 14279 } 14280 14281 /** 14282 * Scroll the view with standard behavior for scrolling beyond the normal 14283 * content boundaries. Views that call this method should override 14284 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 14285 * results of an over-scroll operation. 14286 * 14287 * Views can use this method to handle any touch or fling-based scrolling. 14288 * 14289 * @param deltaX Change in X in pixels 14290 * @param deltaY Change in Y in pixels 14291 * @param scrollX Current X scroll value in pixels before applying deltaX 14292 * @param scrollY Current Y scroll value in pixels before applying deltaY 14293 * @param scrollRangeX Maximum content scroll range along the X axis 14294 * @param scrollRangeY Maximum content scroll range along the Y axis 14295 * @param maxOverScrollX Number of pixels to overscroll by in either direction 14296 * along the X axis. 14297 * @param maxOverScrollY Number of pixels to overscroll by in either direction 14298 * along the Y axis. 14299 * @param isTouchEvent true if this scroll operation is the result of a touch event. 14300 * @return true if scrolling was clamped to an over-scroll boundary along either 14301 * axis, false otherwise. 14302 */ 14303 @SuppressWarnings({"UnusedParameters"}) 14304 protected boolean overScrollBy(int deltaX, int deltaY, 14305 int scrollX, int scrollY, 14306 int scrollRangeX, int scrollRangeY, 14307 int maxOverScrollX, int maxOverScrollY, 14308 boolean isTouchEvent) { 14309 final int overScrollMode = mOverScrollMode; 14310 final boolean canScrollHorizontal = 14311 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 14312 final boolean canScrollVertical = 14313 computeVerticalScrollRange() > computeVerticalScrollExtent(); 14314 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 14315 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 14316 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 14317 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 14318 14319 int newScrollX = scrollX + deltaX; 14320 if (!overScrollHorizontal) { 14321 maxOverScrollX = 0; 14322 } 14323 14324 int newScrollY = scrollY + deltaY; 14325 if (!overScrollVertical) { 14326 maxOverScrollY = 0; 14327 } 14328 14329 // Clamp values if at the limits and record 14330 final int left = -maxOverScrollX; 14331 final int right = maxOverScrollX + scrollRangeX; 14332 final int top = -maxOverScrollY; 14333 final int bottom = maxOverScrollY + scrollRangeY; 14334 14335 boolean clampedX = false; 14336 if (newScrollX > right) { 14337 newScrollX = right; 14338 clampedX = true; 14339 } else if (newScrollX < left) { 14340 newScrollX = left; 14341 clampedX = true; 14342 } 14343 14344 boolean clampedY = false; 14345 if (newScrollY > bottom) { 14346 newScrollY = bottom; 14347 clampedY = true; 14348 } else if (newScrollY < top) { 14349 newScrollY = top; 14350 clampedY = true; 14351 } 14352 14353 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 14354 14355 return clampedX || clampedY; 14356 } 14357 14358 /** 14359 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 14360 * respond to the results of an over-scroll operation. 14361 * 14362 * @param scrollX New X scroll value in pixels 14363 * @param scrollY New Y scroll value in pixels 14364 * @param clampedX True if scrollX was clamped to an over-scroll boundary 14365 * @param clampedY True if scrollY was clamped to an over-scroll boundary 14366 */ 14367 protected void onOverScrolled(int scrollX, int scrollY, 14368 boolean clampedX, boolean clampedY) { 14369 // Intentionally empty. 14370 } 14371 14372 /** 14373 * Returns the over-scroll mode for this view. The result will be 14374 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 14375 * (allow over-scrolling only if the view content is larger than the container), 14376 * or {@link #OVER_SCROLL_NEVER}. 14377 * 14378 * @return This view's over-scroll mode. 14379 */ 14380 public int getOverScrollMode() { 14381 return mOverScrollMode; 14382 } 14383 14384 /** 14385 * Set the over-scroll mode for this view. Valid over-scroll modes are 14386 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 14387 * (allow over-scrolling only if the view content is larger than the container), 14388 * or {@link #OVER_SCROLL_NEVER}. 14389 * 14390 * Setting the over-scroll mode of a view will have an effect only if the 14391 * view is capable of scrolling. 14392 * 14393 * @param overScrollMode The new over-scroll mode for this view. 14394 */ 14395 public void setOverScrollMode(int overScrollMode) { 14396 if (overScrollMode != OVER_SCROLL_ALWAYS && 14397 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 14398 overScrollMode != OVER_SCROLL_NEVER) { 14399 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 14400 } 14401 mOverScrollMode = overScrollMode; 14402 } 14403 14404 /** 14405 * Gets a scale factor that determines the distance the view should scroll 14406 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 14407 * @return The vertical scroll scale factor. 14408 * @hide 14409 */ 14410 protected float getVerticalScrollFactor() { 14411 if (mVerticalScrollFactor == 0) { 14412 TypedValue outValue = new TypedValue(); 14413 if (!mContext.getTheme().resolveAttribute( 14414 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 14415 throw new IllegalStateException( 14416 "Expected theme to define listPreferredItemHeight."); 14417 } 14418 mVerticalScrollFactor = outValue.getDimension( 14419 mContext.getResources().getDisplayMetrics()); 14420 } 14421 return mVerticalScrollFactor; 14422 } 14423 14424 /** 14425 * Gets a scale factor that determines the distance the view should scroll 14426 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 14427 * @return The horizontal scroll scale factor. 14428 * @hide 14429 */ 14430 protected float getHorizontalScrollFactor() { 14431 // TODO: Should use something else. 14432 return getVerticalScrollFactor(); 14433 } 14434 14435 /** 14436 * Return the value specifying the text direction or policy that was set with 14437 * {@link #setTextDirection(int)}. 14438 * 14439 * @return the defined text direction. It can be one of: 14440 * 14441 * {@link #TEXT_DIRECTION_INHERIT}, 14442 * {@link #TEXT_DIRECTION_FIRST_STRONG} 14443 * {@link #TEXT_DIRECTION_ANY_RTL}, 14444 * {@link #TEXT_DIRECTION_LTR}, 14445 * {@link #TEXT_DIRECTION_RTL}, 14446 * {@link #TEXT_DIRECTION_LOCALE}, 14447 */ 14448 public int getTextDirection() { 14449 return mTextDirection; 14450 } 14451 14452 /** 14453 * Set the text direction. 14454 * 14455 * @param textDirection the direction to set. Should be one of: 14456 * 14457 * {@link #TEXT_DIRECTION_INHERIT}, 14458 * {@link #TEXT_DIRECTION_FIRST_STRONG} 14459 * {@link #TEXT_DIRECTION_ANY_RTL}, 14460 * {@link #TEXT_DIRECTION_LTR}, 14461 * {@link #TEXT_DIRECTION_RTL}, 14462 * {@link #TEXT_DIRECTION_LOCALE}, 14463 */ 14464 public void setTextDirection(int textDirection) { 14465 if (textDirection != mTextDirection) { 14466 mTextDirection = textDirection; 14467 resetResolvedTextDirection(); 14468 requestLayout(); 14469 } 14470 } 14471 14472 /** 14473 * Return the resolved text direction. 14474 * 14475 * @return the resolved text direction. Return one of: 14476 * 14477 * {@link #TEXT_DIRECTION_FIRST_STRONG} 14478 * {@link #TEXT_DIRECTION_ANY_RTL}, 14479 * {@link #TEXT_DIRECTION_LTR}, 14480 * {@link #TEXT_DIRECTION_RTL}, 14481 * {@link #TEXT_DIRECTION_LOCALE}, 14482 */ 14483 public int getResolvedTextDirection() { 14484 if (mResolvedTextDirection == TEXT_DIRECTION_INHERIT) { 14485 resolveTextDirection(); 14486 } 14487 return mResolvedTextDirection; 14488 } 14489 14490 /** 14491 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 14492 * resolution is done. 14493 */ 14494 public void resolveTextDirection() { 14495 if (mResolvedTextDirection != TEXT_DIRECTION_INHERIT) { 14496 // Resolution has already been done. 14497 return; 14498 } 14499 if (mTextDirection != TEXT_DIRECTION_INHERIT) { 14500 mResolvedTextDirection = mTextDirection; 14501 } else if (mParent != null && mParent instanceof ViewGroup) { 14502 mResolvedTextDirection = ((ViewGroup) mParent).getResolvedTextDirection(); 14503 } else { 14504 mResolvedTextDirection = TEXT_DIRECTION_FIRST_STRONG; 14505 } 14506 onResolvedTextDirectionChanged(); 14507 } 14508 14509 /** 14510 * Called when text direction has been resolved. Subclasses that care about text direction 14511 * resolution should override this method. 14512 * 14513 * The default implementation does nothing. 14514 */ 14515 public void onResolvedTextDirectionChanged() { 14516 } 14517 14518 /** 14519 * Reset resolved text direction. Text direction can be resolved with a call to 14520 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 14521 * reset is done. 14522 */ 14523 public void resetResolvedTextDirection() { 14524 mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 14525 onResolvedTextDirectionReset(); 14526 } 14527 14528 /** 14529 * Called when text direction is reset. Subclasses that care about text direction reset should 14530 * override this method and do a reset of the text direction of their children. The default 14531 * implementation does nothing. 14532 */ 14533 public void onResolvedTextDirectionReset() { 14534 } 14535 14536 // 14537 // Properties 14538 // 14539 /** 14540 * A Property wrapper around the <code>alpha</code> functionality handled by the 14541 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 14542 */ 14543 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 14544 @Override 14545 public void setValue(View object, float value) { 14546 object.setAlpha(value); 14547 } 14548 14549 @Override 14550 public Float get(View object) { 14551 return object.getAlpha(); 14552 } 14553 }; 14554 14555 /** 14556 * A Property wrapper around the <code>translationX</code> functionality handled by the 14557 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 14558 */ 14559 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 14560 @Override 14561 public void setValue(View object, float value) { 14562 object.setTranslationX(value); 14563 } 14564 14565 @Override 14566 public Float get(View object) { 14567 return object.getTranslationX(); 14568 } 14569 }; 14570 14571 /** 14572 * A Property wrapper around the <code>translationY</code> functionality handled by the 14573 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 14574 */ 14575 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 14576 @Override 14577 public void setValue(View object, float value) { 14578 object.setTranslationY(value); 14579 } 14580 14581 @Override 14582 public Float get(View object) { 14583 return object.getTranslationY(); 14584 } 14585 }; 14586 14587 /** 14588 * A Property wrapper around the <code>x</code> functionality handled by the 14589 * {@link View#setX(float)} and {@link View#getX()} methods. 14590 */ 14591 public static final Property<View, Float> X = new FloatProperty<View>("x") { 14592 @Override 14593 public void setValue(View object, float value) { 14594 object.setX(value); 14595 } 14596 14597 @Override 14598 public Float get(View object) { 14599 return object.getX(); 14600 } 14601 }; 14602 14603 /** 14604 * A Property wrapper around the <code>y</code> functionality handled by the 14605 * {@link View#setY(float)} and {@link View#getY()} methods. 14606 */ 14607 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 14608 @Override 14609 public void setValue(View object, float value) { 14610 object.setY(value); 14611 } 14612 14613 @Override 14614 public Float get(View object) { 14615 return object.getY(); 14616 } 14617 }; 14618 14619 /** 14620 * A Property wrapper around the <code>rotation</code> functionality handled by the 14621 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 14622 */ 14623 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 14624 @Override 14625 public void setValue(View object, float value) { 14626 object.setRotation(value); 14627 } 14628 14629 @Override 14630 public Float get(View object) { 14631 return object.getRotation(); 14632 } 14633 }; 14634 14635 /** 14636 * A Property wrapper around the <code>rotationX</code> functionality handled by the 14637 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 14638 */ 14639 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 14640 @Override 14641 public void setValue(View object, float value) { 14642 object.setRotationX(value); 14643 } 14644 14645 @Override 14646 public Float get(View object) { 14647 return object.getRotationX(); 14648 } 14649 }; 14650 14651 /** 14652 * A Property wrapper around the <code>rotationY</code> functionality handled by the 14653 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 14654 */ 14655 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 14656 @Override 14657 public void setValue(View object, float value) { 14658 object.setRotationY(value); 14659 } 14660 14661 @Override 14662 public Float get(View object) { 14663 return object.getRotationY(); 14664 } 14665 }; 14666 14667 /** 14668 * A Property wrapper around the <code>scaleX</code> functionality handled by the 14669 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 14670 */ 14671 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 14672 @Override 14673 public void setValue(View object, float value) { 14674 object.setScaleX(value); 14675 } 14676 14677 @Override 14678 public Float get(View object) { 14679 return object.getScaleX(); 14680 } 14681 }; 14682 14683 /** 14684 * A Property wrapper around the <code>scaleY</code> functionality handled by the 14685 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 14686 */ 14687 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 14688 @Override 14689 public void setValue(View object, float value) { 14690 object.setScaleY(value); 14691 } 14692 14693 @Override 14694 public Float get(View object) { 14695 return object.getScaleY(); 14696 } 14697 }; 14698 14699 /** 14700 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 14701 * Each MeasureSpec represents a requirement for either the width or the height. 14702 * A MeasureSpec is comprised of a size and a mode. There are three possible 14703 * modes: 14704 * <dl> 14705 * <dt>UNSPECIFIED</dt> 14706 * <dd> 14707 * The parent has not imposed any constraint on the child. It can be whatever size 14708 * it wants. 14709 * </dd> 14710 * 14711 * <dt>EXACTLY</dt> 14712 * <dd> 14713 * The parent has determined an exact size for the child. The child is going to be 14714 * given those bounds regardless of how big it wants to be. 14715 * </dd> 14716 * 14717 * <dt>AT_MOST</dt> 14718 * <dd> 14719 * The child can be as large as it wants up to the specified size. 14720 * </dd> 14721 * </dl> 14722 * 14723 * MeasureSpecs are implemented as ints to reduce object allocation. This class 14724 * is provided to pack and unpack the <size, mode> tuple into the int. 14725 */ 14726 public static class MeasureSpec { 14727 private static final int MODE_SHIFT = 30; 14728 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 14729 14730 /** 14731 * Measure specification mode: The parent has not imposed any constraint 14732 * on the child. It can be whatever size it wants. 14733 */ 14734 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 14735 14736 /** 14737 * Measure specification mode: The parent has determined an exact size 14738 * for the child. The child is going to be given those bounds regardless 14739 * of how big it wants to be. 14740 */ 14741 public static final int EXACTLY = 1 << MODE_SHIFT; 14742 14743 /** 14744 * Measure specification mode: The child can be as large as it wants up 14745 * to the specified size. 14746 */ 14747 public static final int AT_MOST = 2 << MODE_SHIFT; 14748 14749 /** 14750 * Creates a measure specification based on the supplied size and mode. 14751 * 14752 * The mode must always be one of the following: 14753 * <ul> 14754 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 14755 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 14756 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 14757 * </ul> 14758 * 14759 * @param size the size of the measure specification 14760 * @param mode the mode of the measure specification 14761 * @return the measure specification based on size and mode 14762 */ 14763 public static int makeMeasureSpec(int size, int mode) { 14764 return size + mode; 14765 } 14766 14767 /** 14768 * Extracts the mode from the supplied measure specification. 14769 * 14770 * @param measureSpec the measure specification to extract the mode from 14771 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 14772 * {@link android.view.View.MeasureSpec#AT_MOST} or 14773 * {@link android.view.View.MeasureSpec#EXACTLY} 14774 */ 14775 public static int getMode(int measureSpec) { 14776 return (measureSpec & MODE_MASK); 14777 } 14778 14779 /** 14780 * Extracts the size from the supplied measure specification. 14781 * 14782 * @param measureSpec the measure specification to extract the size from 14783 * @return the size in pixels defined in the supplied measure specification 14784 */ 14785 public static int getSize(int measureSpec) { 14786 return (measureSpec & ~MODE_MASK); 14787 } 14788 14789 /** 14790 * Returns a String representation of the specified measure 14791 * specification. 14792 * 14793 * @param measureSpec the measure specification to convert to a String 14794 * @return a String with the following format: "MeasureSpec: MODE SIZE" 14795 */ 14796 public static String toString(int measureSpec) { 14797 int mode = getMode(measureSpec); 14798 int size = getSize(measureSpec); 14799 14800 StringBuilder sb = new StringBuilder("MeasureSpec: "); 14801 14802 if (mode == UNSPECIFIED) 14803 sb.append("UNSPECIFIED "); 14804 else if (mode == EXACTLY) 14805 sb.append("EXACTLY "); 14806 else if (mode == AT_MOST) 14807 sb.append("AT_MOST "); 14808 else 14809 sb.append(mode).append(" "); 14810 14811 sb.append(size); 14812 return sb.toString(); 14813 } 14814 } 14815 14816 class CheckForLongPress implements Runnable { 14817 14818 private int mOriginalWindowAttachCount; 14819 14820 public void run() { 14821 if (isPressed() && (mParent != null) 14822 && mOriginalWindowAttachCount == mWindowAttachCount) { 14823 if (performLongClick()) { 14824 mHasPerformedLongPress = true; 14825 } 14826 } 14827 } 14828 14829 public void rememberWindowAttachCount() { 14830 mOriginalWindowAttachCount = mWindowAttachCount; 14831 } 14832 } 14833 14834 private final class CheckForTap implements Runnable { 14835 public void run() { 14836 mPrivateFlags &= ~PREPRESSED; 14837 setPressed(true); 14838 checkForLongClick(ViewConfiguration.getTapTimeout()); 14839 } 14840 } 14841 14842 private final class PerformClick implements Runnable { 14843 public void run() { 14844 performClick(); 14845 } 14846 } 14847 14848 /** @hide */ 14849 public void hackTurnOffWindowResizeAnim(boolean off) { 14850 mAttachInfo.mTurnOffWindowResizeAnim = off; 14851 } 14852 14853 /** 14854 * This method returns a ViewPropertyAnimator object, which can be used to animate 14855 * specific properties on this View. 14856 * 14857 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 14858 */ 14859 public ViewPropertyAnimator animate() { 14860 if (mAnimator == null) { 14861 mAnimator = new ViewPropertyAnimator(this); 14862 } 14863 return mAnimator; 14864 } 14865 14866 /** 14867 * Interface definition for a callback to be invoked when a key event is 14868 * dispatched to this view. The callback will be invoked before the key 14869 * event is given to the view. 14870 */ 14871 public interface OnKeyListener { 14872 /** 14873 * Called when a key is dispatched to a view. This allows listeners to 14874 * get a chance to respond before the target view. 14875 * 14876 * @param v The view the key has been dispatched to. 14877 * @param keyCode The code for the physical key that was pressed 14878 * @param event The KeyEvent object containing full information about 14879 * the event. 14880 * @return True if the listener has consumed the event, false otherwise. 14881 */ 14882 boolean onKey(View v, int keyCode, KeyEvent event); 14883 } 14884 14885 /** 14886 * Interface definition for a callback to be invoked when a touch event is 14887 * dispatched to this view. The callback will be invoked before the touch 14888 * event is given to the view. 14889 */ 14890 public interface OnTouchListener { 14891 /** 14892 * Called when a touch event is dispatched to a view. This allows listeners to 14893 * get a chance to respond before the target view. 14894 * 14895 * @param v The view the touch event has been dispatched to. 14896 * @param event The MotionEvent object containing full information about 14897 * the event. 14898 * @return True if the listener has consumed the event, false otherwise. 14899 */ 14900 boolean onTouch(View v, MotionEvent event); 14901 } 14902 14903 /** 14904 * Interface definition for a callback to be invoked when a hover event is 14905 * dispatched to this view. The callback will be invoked before the hover 14906 * event is given to the view. 14907 */ 14908 public interface OnHoverListener { 14909 /** 14910 * Called when a hover event is dispatched to a view. This allows listeners to 14911 * get a chance to respond before the target view. 14912 * 14913 * @param v The view the hover event has been dispatched to. 14914 * @param event The MotionEvent object containing full information about 14915 * the event. 14916 * @return True if the listener has consumed the event, false otherwise. 14917 */ 14918 boolean onHover(View v, MotionEvent event); 14919 } 14920 14921 /** 14922 * Interface definition for a callback to be invoked when a generic motion event is 14923 * dispatched to this view. The callback will be invoked before the generic motion 14924 * event is given to the view. 14925 */ 14926 public interface OnGenericMotionListener { 14927 /** 14928 * Called when a generic motion event is dispatched to a view. This allows listeners to 14929 * get a chance to respond before the target view. 14930 * 14931 * @param v The view the generic motion event has been dispatched to. 14932 * @param event The MotionEvent object containing full information about 14933 * the event. 14934 * @return True if the listener has consumed the event, false otherwise. 14935 */ 14936 boolean onGenericMotion(View v, MotionEvent event); 14937 } 14938 14939 /** 14940 * Interface definition for a callback to be invoked when a view has been clicked and held. 14941 */ 14942 public interface OnLongClickListener { 14943 /** 14944 * Called when a view has been clicked and held. 14945 * 14946 * @param v The view that was clicked and held. 14947 * 14948 * @return true if the callback consumed the long click, false otherwise. 14949 */ 14950 boolean onLongClick(View v); 14951 } 14952 14953 /** 14954 * Interface definition for a callback to be invoked when a drag is being dispatched 14955 * to this view. The callback will be invoked before the hosting view's own 14956 * onDrag(event) method. If the listener wants to fall back to the hosting view's 14957 * onDrag(event) behavior, it should return 'false' from this callback. 14958 * 14959 * <div class="special reference"> 14960 * <h3>Developer Guides</h3> 14961 * <p>For a guide to implementing drag and drop features, read the 14962 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 14963 * </div> 14964 */ 14965 public interface OnDragListener { 14966 /** 14967 * Called when a drag event is dispatched to a view. This allows listeners 14968 * to get a chance to override base View behavior. 14969 * 14970 * @param v The View that received the drag event. 14971 * @param event The {@link android.view.DragEvent} object for the drag event. 14972 * @return {@code true} if the drag event was handled successfully, or {@code false} 14973 * if the drag event was not handled. Note that {@code false} will trigger the View 14974 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 14975 */ 14976 boolean onDrag(View v, DragEvent event); 14977 } 14978 14979 /** 14980 * Interface definition for a callback to be invoked when the focus state of 14981 * a view changed. 14982 */ 14983 public interface OnFocusChangeListener { 14984 /** 14985 * Called when the focus state of a view has changed. 14986 * 14987 * @param v The view whose state has changed. 14988 * @param hasFocus The new focus state of v. 14989 */ 14990 void onFocusChange(View v, boolean hasFocus); 14991 } 14992 14993 /** 14994 * Interface definition for a callback to be invoked when a view is clicked. 14995 */ 14996 public interface OnClickListener { 14997 /** 14998 * Called when a view has been clicked. 14999 * 15000 * @param v The view that was clicked. 15001 */ 15002 void onClick(View v); 15003 } 15004 15005 /** 15006 * Interface definition for a callback to be invoked when the context menu 15007 * for this view is being built. 15008 */ 15009 public interface OnCreateContextMenuListener { 15010 /** 15011 * Called when the context menu for this view is being built. It is not 15012 * safe to hold onto the menu after this method returns. 15013 * 15014 * @param menu The context menu that is being built 15015 * @param v The view for which the context menu is being built 15016 * @param menuInfo Extra information about the item for which the 15017 * context menu should be shown. This information will vary 15018 * depending on the class of v. 15019 */ 15020 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 15021 } 15022 15023 /** 15024 * Interface definition for a callback to be invoked when the status bar changes 15025 * visibility. This reports <strong>global</strong> changes to the system UI 15026 * state, not just what the application is requesting. 15027 * 15028 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 15029 */ 15030 public interface OnSystemUiVisibilityChangeListener { 15031 /** 15032 * Called when the status bar changes visibility because of a call to 15033 * {@link View#setSystemUiVisibility(int)}. 15034 * 15035 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 15036 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. This tells you the 15037 * <strong>global</strong> state of the UI visibility flags, not what your 15038 * app is currently applying. 15039 */ 15040 public void onSystemUiVisibilityChange(int visibility); 15041 } 15042 15043 /** 15044 * Interface definition for a callback to be invoked when this view is attached 15045 * or detached from its window. 15046 */ 15047 public interface OnAttachStateChangeListener { 15048 /** 15049 * Called when the view is attached to a window. 15050 * @param v The view that was attached 15051 */ 15052 public void onViewAttachedToWindow(View v); 15053 /** 15054 * Called when the view is detached from a window. 15055 * @param v The view that was detached 15056 */ 15057 public void onViewDetachedFromWindow(View v); 15058 } 15059 15060 private final class UnsetPressedState implements Runnable { 15061 public void run() { 15062 setPressed(false); 15063 } 15064 } 15065 15066 /** 15067 * Base class for derived classes that want to save and restore their own 15068 * state in {@link android.view.View#onSaveInstanceState()}. 15069 */ 15070 public static class BaseSavedState extends AbsSavedState { 15071 /** 15072 * Constructor used when reading from a parcel. Reads the state of the superclass. 15073 * 15074 * @param source 15075 */ 15076 public BaseSavedState(Parcel source) { 15077 super(source); 15078 } 15079 15080 /** 15081 * Constructor called by derived classes when creating their SavedState objects 15082 * 15083 * @param superState The state of the superclass of this view 15084 */ 15085 public BaseSavedState(Parcelable superState) { 15086 super(superState); 15087 } 15088 15089 public static final Parcelable.Creator<BaseSavedState> CREATOR = 15090 new Parcelable.Creator<BaseSavedState>() { 15091 public BaseSavedState createFromParcel(Parcel in) { 15092 return new BaseSavedState(in); 15093 } 15094 15095 public BaseSavedState[] newArray(int size) { 15096 return new BaseSavedState[size]; 15097 } 15098 }; 15099 } 15100 15101 /** 15102 * A set of information given to a view when it is attached to its parent 15103 * window. 15104 */ 15105 static class AttachInfo { 15106 interface Callbacks { 15107 void playSoundEffect(int effectId); 15108 boolean performHapticFeedback(int effectId, boolean always); 15109 } 15110 15111 /** 15112 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 15113 * to a Handler. This class contains the target (View) to invalidate and 15114 * the coordinates of the dirty rectangle. 15115 * 15116 * For performance purposes, this class also implements a pool of up to 15117 * POOL_LIMIT objects that get reused. This reduces memory allocations 15118 * whenever possible. 15119 */ 15120 static class InvalidateInfo implements Poolable<InvalidateInfo> { 15121 private static final int POOL_LIMIT = 10; 15122 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 15123 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 15124 public InvalidateInfo newInstance() { 15125 return new InvalidateInfo(); 15126 } 15127 15128 public void onAcquired(InvalidateInfo element) { 15129 } 15130 15131 public void onReleased(InvalidateInfo element) { 15132 element.target = null; 15133 } 15134 }, POOL_LIMIT) 15135 ); 15136 15137 private InvalidateInfo mNext; 15138 private boolean mIsPooled; 15139 15140 View target; 15141 15142 int left; 15143 int top; 15144 int right; 15145 int bottom; 15146 15147 public void setNextPoolable(InvalidateInfo element) { 15148 mNext = element; 15149 } 15150 15151 public InvalidateInfo getNextPoolable() { 15152 return mNext; 15153 } 15154 15155 static InvalidateInfo acquire() { 15156 return sPool.acquire(); 15157 } 15158 15159 void release() { 15160 sPool.release(this); 15161 } 15162 15163 public boolean isPooled() { 15164 return mIsPooled; 15165 } 15166 15167 public void setPooled(boolean isPooled) { 15168 mIsPooled = isPooled; 15169 } 15170 } 15171 15172 final IWindowSession mSession; 15173 15174 final IWindow mWindow; 15175 15176 final IBinder mWindowToken; 15177 15178 final Callbacks mRootCallbacks; 15179 15180 HardwareCanvas mHardwareCanvas; 15181 15182 /** 15183 * The top view of the hierarchy. 15184 */ 15185 View mRootView; 15186 15187 IBinder mPanelParentWindowToken; 15188 Surface mSurface; 15189 15190 boolean mHardwareAccelerated; 15191 boolean mHardwareAccelerationRequested; 15192 HardwareRenderer mHardwareRenderer; 15193 15194 boolean mScreenOn; 15195 15196 /** 15197 * Scale factor used by the compatibility mode 15198 */ 15199 float mApplicationScale; 15200 15201 /** 15202 * Indicates whether the application is in compatibility mode 15203 */ 15204 boolean mScalingRequired; 15205 15206 /** 15207 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 15208 */ 15209 boolean mTurnOffWindowResizeAnim; 15210 15211 /** 15212 * Left position of this view's window 15213 */ 15214 int mWindowLeft; 15215 15216 /** 15217 * Top position of this view's window 15218 */ 15219 int mWindowTop; 15220 15221 /** 15222 * Indicates whether views need to use 32-bit drawing caches 15223 */ 15224 boolean mUse32BitDrawingCache; 15225 15226 /** 15227 * For windows that are full-screen but using insets to layout inside 15228 * of the screen decorations, these are the current insets for the 15229 * content of the window. 15230 */ 15231 final Rect mContentInsets = new Rect(); 15232 15233 /** 15234 * For windows that are full-screen but using insets to layout inside 15235 * of the screen decorations, these are the current insets for the 15236 * actual visible parts of the window. 15237 */ 15238 final Rect mVisibleInsets = new Rect(); 15239 15240 /** 15241 * The internal insets given by this window. This value is 15242 * supplied by the client (through 15243 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 15244 * be given to the window manager when changed to be used in laying 15245 * out windows behind it. 15246 */ 15247 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 15248 = new ViewTreeObserver.InternalInsetsInfo(); 15249 15250 /** 15251 * All views in the window's hierarchy that serve as scroll containers, 15252 * used to determine if the window can be resized or must be panned 15253 * to adjust for a soft input area. 15254 */ 15255 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 15256 15257 final KeyEvent.DispatcherState mKeyDispatchState 15258 = new KeyEvent.DispatcherState(); 15259 15260 /** 15261 * Indicates whether the view's window currently has the focus. 15262 */ 15263 boolean mHasWindowFocus; 15264 15265 /** 15266 * The current visibility of the window. 15267 */ 15268 int mWindowVisibility; 15269 15270 /** 15271 * Indicates the time at which drawing started to occur. 15272 */ 15273 long mDrawingTime; 15274 15275 /** 15276 * Indicates whether or not ignoring the DIRTY_MASK flags. 15277 */ 15278 boolean mIgnoreDirtyState; 15279 15280 /** 15281 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 15282 * to avoid clearing that flag prematurely. 15283 */ 15284 boolean mSetIgnoreDirtyState = false; 15285 15286 /** 15287 * Indicates whether the view's window is currently in touch mode. 15288 */ 15289 boolean mInTouchMode; 15290 15291 /** 15292 * Indicates that ViewAncestor should trigger a global layout change 15293 * the next time it performs a traversal 15294 */ 15295 boolean mRecomputeGlobalAttributes; 15296 15297 /** 15298 * Always report new attributes at next traversal. 15299 */ 15300 boolean mForceReportNewAttributes; 15301 15302 /** 15303 * Set during a traveral if any views want to keep the screen on. 15304 */ 15305 boolean mKeepScreenOn; 15306 15307 /** 15308 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 15309 */ 15310 int mSystemUiVisibility; 15311 15312 /** 15313 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 15314 * attached. 15315 */ 15316 boolean mHasSystemUiListeners; 15317 15318 /** 15319 * Set if the visibility of any views has changed. 15320 */ 15321 boolean mViewVisibilityChanged; 15322 15323 /** 15324 * Set to true if a view has been scrolled. 15325 */ 15326 boolean mViewScrollChanged; 15327 15328 /** 15329 * Global to the view hierarchy used as a temporary for dealing with 15330 * x/y points in the transparent region computations. 15331 */ 15332 final int[] mTransparentLocation = new int[2]; 15333 15334 /** 15335 * Global to the view hierarchy used as a temporary for dealing with 15336 * x/y points in the ViewGroup.invalidateChild implementation. 15337 */ 15338 final int[] mInvalidateChildLocation = new int[2]; 15339 15340 15341 /** 15342 * Global to the view hierarchy used as a temporary for dealing with 15343 * x/y location when view is transformed. 15344 */ 15345 final float[] mTmpTransformLocation = new float[2]; 15346 15347 /** 15348 * The view tree observer used to dispatch global events like 15349 * layout, pre-draw, touch mode change, etc. 15350 */ 15351 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 15352 15353 /** 15354 * A Canvas used by the view hierarchy to perform bitmap caching. 15355 */ 15356 Canvas mCanvas; 15357 15358 /** 15359 * The view root impl. 15360 */ 15361 final ViewRootImpl mViewRootImpl; 15362 15363 /** 15364 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 15365 * handler can be used to pump events in the UI events queue. 15366 */ 15367 final Handler mHandler; 15368 15369 /** 15370 * Temporary for use in computing invalidate rectangles while 15371 * calling up the hierarchy. 15372 */ 15373 final Rect mTmpInvalRect = new Rect(); 15374 15375 /** 15376 * Temporary for use in computing hit areas with transformed views 15377 */ 15378 final RectF mTmpTransformRect = new RectF(); 15379 15380 /** 15381 * Temporary list for use in collecting focusable descendents of a view. 15382 */ 15383 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 15384 15385 /** 15386 * The id of the window for accessibility purposes. 15387 */ 15388 int mAccessibilityWindowId = View.NO_ID; 15389 15390 /** 15391 * Creates a new set of attachment information with the specified 15392 * events handler and thread. 15393 * 15394 * @param handler the events handler the view must use 15395 */ 15396 AttachInfo(IWindowSession session, IWindow window, 15397 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 15398 mSession = session; 15399 mWindow = window; 15400 mWindowToken = window.asBinder(); 15401 mViewRootImpl = viewRootImpl; 15402 mHandler = handler; 15403 mRootCallbacks = effectPlayer; 15404 } 15405 } 15406 15407 /** 15408 * <p>ScrollabilityCache holds various fields used by a View when scrolling 15409 * is supported. This avoids keeping too many unused fields in most 15410 * instances of View.</p> 15411 */ 15412 private static class ScrollabilityCache implements Runnable { 15413 15414 /** 15415 * Scrollbars are not visible 15416 */ 15417 public static final int OFF = 0; 15418 15419 /** 15420 * Scrollbars are visible 15421 */ 15422 public static final int ON = 1; 15423 15424 /** 15425 * Scrollbars are fading away 15426 */ 15427 public static final int FADING = 2; 15428 15429 public boolean fadeScrollBars; 15430 15431 public int fadingEdgeLength; 15432 public int scrollBarDefaultDelayBeforeFade; 15433 public int scrollBarFadeDuration; 15434 15435 public int scrollBarSize; 15436 public ScrollBarDrawable scrollBar; 15437 public float[] interpolatorValues; 15438 public View host; 15439 15440 public final Paint paint; 15441 public final Matrix matrix; 15442 public Shader shader; 15443 15444 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 15445 15446 private static final float[] OPAQUE = { 255 }; 15447 private static final float[] TRANSPARENT = { 0.0f }; 15448 15449 /** 15450 * When fading should start. This time moves into the future every time 15451 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 15452 */ 15453 public long fadeStartTime; 15454 15455 15456 /** 15457 * The current state of the scrollbars: ON, OFF, or FADING 15458 */ 15459 public int state = OFF; 15460 15461 private int mLastColor; 15462 15463 public ScrollabilityCache(ViewConfiguration configuration, View host) { 15464 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 15465 scrollBarSize = configuration.getScaledScrollBarSize(); 15466 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 15467 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 15468 15469 paint = new Paint(); 15470 matrix = new Matrix(); 15471 // use use a height of 1, and then wack the matrix each time we 15472 // actually use it. 15473 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 15474 15475 paint.setShader(shader); 15476 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 15477 this.host = host; 15478 } 15479 15480 public void setFadeColor(int color) { 15481 if (color != 0 && color != mLastColor) { 15482 mLastColor = color; 15483 color |= 0xFF000000; 15484 15485 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 15486 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 15487 15488 paint.setShader(shader); 15489 // Restore the default transfer mode (src_over) 15490 paint.setXfermode(null); 15491 } 15492 } 15493 15494 public void run() { 15495 long now = AnimationUtils.currentAnimationTimeMillis(); 15496 if (now >= fadeStartTime) { 15497 15498 // the animation fades the scrollbars out by changing 15499 // the opacity (alpha) from fully opaque to fully 15500 // transparent 15501 int nextFrame = (int) now; 15502 int framesCount = 0; 15503 15504 Interpolator interpolator = scrollBarInterpolator; 15505 15506 // Start opaque 15507 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 15508 15509 // End transparent 15510 nextFrame += scrollBarFadeDuration; 15511 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 15512 15513 state = FADING; 15514 15515 // Kick off the fade animation 15516 host.invalidate(true); 15517 } 15518 } 15519 } 15520 15521 /** 15522 * Resuable callback for sending 15523 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 15524 */ 15525 private class SendViewScrolledAccessibilityEvent implements Runnable { 15526 public volatile boolean mIsPending; 15527 15528 public void run() { 15529 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 15530 mIsPending = false; 15531 } 15532 } 15533 15534 /** 15535 * <p> 15536 * This class represents a delegate that can be registered in a {@link View} 15537 * to enhance accessibility support via composition rather via inheritance. 15538 * It is specifically targeted to widget developers that extend basic View 15539 * classes i.e. classes in package android.view, that would like their 15540 * applications to be backwards compatible. 15541 * </p> 15542 * <p> 15543 * A scenario in which a developer would like to use an accessibility delegate 15544 * is overriding a method introduced in a later API version then the minimal API 15545 * version supported by the application. For example, the method 15546 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 15547 * in API version 4 when the accessibility APIs were first introduced. If a 15548 * developer would like his application to run on API version 4 devices (assuming 15549 * all other APIs used by the application are version 4 or lower) and take advantage 15550 * of this method, instead of overriding the method which would break the application's 15551 * backwards compatibility, he can override the corresponding method in this 15552 * delegate and register the delegate in the target View if the API version of 15553 * the system is high enough i.e. the API version is same or higher to the API 15554 * version that introduced 15555 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 15556 * </p> 15557 * <p> 15558 * Here is an example implementation: 15559 * </p> 15560 * <code><pre><p> 15561 * if (Build.VERSION.SDK_INT >= 14) { 15562 * // If the API version is equal of higher than the version in 15563 * // which onInitializeAccessibilityNodeInfo was introduced we 15564 * // register a delegate with a customized implementation. 15565 * View view = findViewById(R.id.view_id); 15566 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 15567 * public void onInitializeAccessibilityNodeInfo(View host, 15568 * AccessibilityNodeInfo info) { 15569 * // Let the default implementation populate the info. 15570 * super.onInitializeAccessibilityNodeInfo(host, info); 15571 * // Set some other information. 15572 * info.setEnabled(host.isEnabled()); 15573 * } 15574 * }); 15575 * } 15576 * </code></pre></p> 15577 * <p> 15578 * This delegate contains methods that correspond to the accessibility methods 15579 * in View. If a delegate has been specified the implementation in View hands 15580 * off handling to the corresponding method in this delegate. The default 15581 * implementation the delegate methods behaves exactly as the corresponding 15582 * method in View for the case of no accessibility delegate been set. Hence, 15583 * to customize the behavior of a View method, clients can override only the 15584 * corresponding delegate method without altering the behavior of the rest 15585 * accessibility related methods of the host view. 15586 * </p> 15587 */ 15588 public static class AccessibilityDelegate { 15589 15590 /** 15591 * Sends an accessibility event of the given type. If accessibility is not 15592 * enabled this method has no effect. 15593 * <p> 15594 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 15595 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 15596 * been set. 15597 * </p> 15598 * 15599 * @param host The View hosting the delegate. 15600 * @param eventType The type of the event to send. 15601 * 15602 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 15603 */ 15604 public void sendAccessibilityEvent(View host, int eventType) { 15605 host.sendAccessibilityEventInternal(eventType); 15606 } 15607 15608 /** 15609 * Sends an accessibility event. This method behaves exactly as 15610 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 15611 * empty {@link AccessibilityEvent} and does not perform a check whether 15612 * accessibility is enabled. 15613 * <p> 15614 * The default implementation behaves as 15615 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 15616 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 15617 * the case of no accessibility delegate been set. 15618 * </p> 15619 * 15620 * @param host The View hosting the delegate. 15621 * @param event The event to send. 15622 * 15623 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 15624 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 15625 */ 15626 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 15627 host.sendAccessibilityEventUncheckedInternal(event); 15628 } 15629 15630 /** 15631 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 15632 * to its children for adding their text content to the event. 15633 * <p> 15634 * The default implementation behaves as 15635 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 15636 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 15637 * the case of no accessibility delegate been set. 15638 * </p> 15639 * 15640 * @param host The View hosting the delegate. 15641 * @param event The event. 15642 * @return True if the event population was completed. 15643 * 15644 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 15645 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 15646 */ 15647 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 15648 return host.dispatchPopulateAccessibilityEventInternal(event); 15649 } 15650 15651 /** 15652 * Gives a chance to the host View to populate the accessibility event with its 15653 * text content. 15654 * <p> 15655 * The default implementation behaves as 15656 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 15657 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 15658 * the case of no accessibility delegate been set. 15659 * </p> 15660 * 15661 * @param host The View hosting the delegate. 15662 * @param event The accessibility event which to populate. 15663 * 15664 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 15665 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 15666 */ 15667 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 15668 host.onPopulateAccessibilityEventInternal(event); 15669 } 15670 15671 /** 15672 * Initializes an {@link AccessibilityEvent} with information about the 15673 * the host View which is the event source. 15674 * <p> 15675 * The default implementation behaves as 15676 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 15677 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 15678 * the case of no accessibility delegate been set. 15679 * </p> 15680 * 15681 * @param host The View hosting the delegate. 15682 * @param event The event to initialize. 15683 * 15684 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 15685 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 15686 */ 15687 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 15688 host.onInitializeAccessibilityEventInternal(event); 15689 } 15690 15691 /** 15692 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 15693 * <p> 15694 * The default implementation behaves as 15695 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 15696 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 15697 * the case of no accessibility delegate been set. 15698 * </p> 15699 * 15700 * @param host The View hosting the delegate. 15701 * @param info The instance to initialize. 15702 * 15703 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 15704 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 15705 */ 15706 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 15707 host.onInitializeAccessibilityNodeInfoInternal(info); 15708 } 15709 15710 /** 15711 * Called when a child of the host View has requested sending an 15712 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 15713 * to augment the event. 15714 * <p> 15715 * The default implementation behaves as 15716 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15717 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 15718 * the case of no accessibility delegate been set. 15719 * </p> 15720 * 15721 * @param host The View hosting the delegate. 15722 * @param child The child which requests sending the event. 15723 * @param event The event to be sent. 15724 * @return True if the event should be sent 15725 * 15726 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15727 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15728 */ 15729 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 15730 AccessibilityEvent event) { 15731 return host.onRequestSendAccessibilityEventInternal(child, event); 15732 } 15733 15734 /** 15735 * Gets the provider for managing a virtual view hierarchy rooted at this View 15736 * and reported to {@link android.accessibilityservice.AccessibilityService}s 15737 * that explore the window content. 15738 * <p> 15739 * The default implementation behaves as 15740 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 15741 * the case of no accessibility delegate been set. 15742 * </p> 15743 * 15744 * @return The provider. 15745 * 15746 * @see AccessibilityNodeProvider 15747 */ 15748 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 15749 return null; 15750 } 15751 } 15752} 15753