View.java revision eaa0a04f83113e2cafb8c2044ae2107d15dd8036
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.content.ClipData; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Camera; 26import android.graphics.Canvas; 27import android.graphics.Insets; 28import android.graphics.Interpolator; 29import android.graphics.LinearGradient; 30import android.graphics.Matrix; 31import android.graphics.Paint; 32import android.graphics.PixelFormat; 33import android.graphics.Point; 34import android.graphics.PorterDuff; 35import android.graphics.PorterDuffXfermode; 36import android.graphics.Rect; 37import android.graphics.RectF; 38import android.graphics.Region; 39import android.graphics.Shader; 40import android.graphics.drawable.ColorDrawable; 41import android.graphics.drawable.Drawable; 42import android.os.Handler; 43import android.os.IBinder; 44import android.os.Parcel; 45import android.os.Parcelable; 46import android.os.RemoteException; 47import android.os.SystemClock; 48import android.text.TextUtils; 49import android.util.AttributeSet; 50import android.util.FloatProperty; 51import android.util.LocaleUtil; 52import android.util.Log; 53import android.util.Pool; 54import android.util.Poolable; 55import android.util.PoolableManager; 56import android.util.Pools; 57import android.util.Property; 58import android.util.SparseArray; 59import android.util.TypedValue; 60import android.view.ContextMenu.ContextMenuInfo; 61import android.view.accessibility.AccessibilityEvent; 62import android.view.accessibility.AccessibilityEventSource; 63import android.view.accessibility.AccessibilityManager; 64import android.view.accessibility.AccessibilityNodeInfo; 65import android.view.accessibility.AccessibilityNodeProvider; 66import android.view.animation.Animation; 67import android.view.animation.AnimationUtils; 68import android.view.animation.Transformation; 69import android.view.inputmethod.EditorInfo; 70import android.view.inputmethod.InputConnection; 71import android.view.inputmethod.InputMethodManager; 72import android.widget.ScrollBarDrawable; 73 74import static android.os.Build.VERSION_CODES.*; 75import static java.lang.Math.max; 76 77import com.android.internal.R; 78import com.android.internal.util.Predicate; 79import com.android.internal.view.menu.MenuBuilder; 80 81import java.lang.ref.WeakReference; 82import java.lang.reflect.InvocationTargetException; 83import java.lang.reflect.Method; 84import java.util.ArrayList; 85import java.util.Arrays; 86import java.util.Locale; 87import java.util.concurrent.CopyOnWriteArrayList; 88 89/** 90 * <p> 91 * This class represents the basic building block for user interface components. A View 92 * occupies a rectangular area on the screen and is responsible for drawing and 93 * event handling. View is the base class for <em>widgets</em>, which are 94 * used to create interactive UI components (buttons, text fields, etc.). The 95 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 96 * are invisible containers that hold other Views (or other ViewGroups) and define 97 * their layout properties. 98 * </p> 99 * 100 * <div class="special reference"> 101 * <h3>Developer Guides</h3> 102 * <p>For information about using this class to develop your application's user interface, 103 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 104 * </div> 105 * 106 * <a name="Using"></a> 107 * <h3>Using Views</h3> 108 * <p> 109 * All of the views in a window are arranged in a single tree. You can add views 110 * either from code or by specifying a tree of views in one or more XML layout 111 * files. There are many specialized subclasses of views that act as controls or 112 * are capable of displaying text, images, or other content. 113 * </p> 114 * <p> 115 * Once you have created a tree of views, there are typically a few types of 116 * common operations you may wish to perform: 117 * <ul> 118 * <li><strong>Set properties:</strong> for example setting the text of a 119 * {@link android.widget.TextView}. The available properties and the methods 120 * that set them will vary among the different subclasses of views. Note that 121 * properties that are known at build time can be set in the XML layout 122 * files.</li> 123 * <li><strong>Set focus:</strong> The framework will handled moving focus in 124 * response to user input. To force focus to a specific view, call 125 * {@link #requestFocus}.</li> 126 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 127 * that will be notified when something interesting happens to the view. For 128 * example, all views will let you set a listener to be notified when the view 129 * gains or loses focus. You can register such a listener using 130 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 131 * Other view subclasses offer more specialized listeners. For example, a Button 132 * exposes a listener to notify clients when the button is clicked.</li> 133 * <li><strong>Set visibility:</strong> You can hide or show views using 134 * {@link #setVisibility(int)}.</li> 135 * </ul> 136 * </p> 137 * <p><em> 138 * Note: The Android framework is responsible for measuring, laying out and 139 * drawing views. You should not call methods that perform these actions on 140 * views yourself unless you are actually implementing a 141 * {@link android.view.ViewGroup}. 142 * </em></p> 143 * 144 * <a name="Lifecycle"></a> 145 * <h3>Implementing a Custom View</h3> 146 * 147 * <p> 148 * To implement a custom view, you will usually begin by providing overrides for 149 * some of the standard methods that the framework calls on all views. You do 150 * not need to override all of these methods. In fact, you can start by just 151 * overriding {@link #onDraw(android.graphics.Canvas)}. 152 * <table border="2" width="85%" align="center" cellpadding="5"> 153 * <thead> 154 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 155 * </thead> 156 * 157 * <tbody> 158 * <tr> 159 * <td rowspan="2">Creation</td> 160 * <td>Constructors</td> 161 * <td>There is a form of the constructor that are called when the view 162 * is created from code and a form that is called when the view is 163 * inflated from a layout file. The second form should parse and apply 164 * any attributes defined in the layout file. 165 * </td> 166 * </tr> 167 * <tr> 168 * <td><code>{@link #onFinishInflate()}</code></td> 169 * <td>Called after a view and all of its children has been inflated 170 * from XML.</td> 171 * </tr> 172 * 173 * <tr> 174 * <td rowspan="3">Layout</td> 175 * <td><code>{@link #onMeasure(int, int)}</code></td> 176 * <td>Called to determine the size requirements for this view and all 177 * of its children. 178 * </td> 179 * </tr> 180 * <tr> 181 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 182 * <td>Called when this view should assign a size and position to all 183 * of its children. 184 * </td> 185 * </tr> 186 * <tr> 187 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 188 * <td>Called when the size of this view has changed. 189 * </td> 190 * </tr> 191 * 192 * <tr> 193 * <td>Drawing</td> 194 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 195 * <td>Called when the view should render its content. 196 * </td> 197 * </tr> 198 * 199 * <tr> 200 * <td rowspan="4">Event processing</td> 201 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 202 * <td>Called when a new key event occurs. 203 * </td> 204 * </tr> 205 * <tr> 206 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 207 * <td>Called when a key up event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 212 * <td>Called when a trackball motion event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 217 * <td>Called when a touch screen motion event occurs. 218 * </td> 219 * </tr> 220 * 221 * <tr> 222 * <td rowspan="2">Focus</td> 223 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 224 * <td>Called when the view gains or loses focus. 225 * </td> 226 * </tr> 227 * 228 * <tr> 229 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 230 * <td>Called when the window containing the view gains or loses focus. 231 * </td> 232 * </tr> 233 * 234 * <tr> 235 * <td rowspan="3">Attaching</td> 236 * <td><code>{@link #onAttachedToWindow()}</code></td> 237 * <td>Called when the view is attached to a window. 238 * </td> 239 * </tr> 240 * 241 * <tr> 242 * <td><code>{@link #onDetachedFromWindow}</code></td> 243 * <td>Called when the view is detached from its window. 244 * </td> 245 * </tr> 246 * 247 * <tr> 248 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 249 * <td>Called when the visibility of the window containing the view 250 * has changed. 251 * </td> 252 * </tr> 253 * </tbody> 254 * 255 * </table> 256 * </p> 257 * 258 * <a name="IDs"></a> 259 * <h3>IDs</h3> 260 * Views may have an integer id associated with them. These ids are typically 261 * assigned in the layout XML files, and are used to find specific views within 262 * the view tree. A common pattern is to: 263 * <ul> 264 * <li>Define a Button in the layout file and assign it a unique ID. 265 * <pre> 266 * <Button 267 * android:id="@+id/my_button" 268 * android:layout_width="wrap_content" 269 * android:layout_height="wrap_content" 270 * android:text="@string/my_button_text"/> 271 * </pre></li> 272 * <li>From the onCreate method of an Activity, find the Button 273 * <pre class="prettyprint"> 274 * Button myButton = (Button) findViewById(R.id.my_button); 275 * </pre></li> 276 * </ul> 277 * <p> 278 * View IDs need not be unique throughout the tree, but it is good practice to 279 * ensure that they are at least unique within the part of the tree you are 280 * searching. 281 * </p> 282 * 283 * <a name="Position"></a> 284 * <h3>Position</h3> 285 * <p> 286 * The geometry of a view is that of a rectangle. A view has a location, 287 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 288 * two dimensions, expressed as a width and a height. The unit for location 289 * and dimensions is the pixel. 290 * </p> 291 * 292 * <p> 293 * It is possible to retrieve the location of a view by invoking the methods 294 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 295 * coordinate of the rectangle representing the view. The latter returns the 296 * top, or Y, coordinate of the rectangle representing the view. These methods 297 * both return the location of the view relative to its parent. For instance, 298 * when getLeft() returns 20, that means the view is located 20 pixels to the 299 * right of the left edge of its direct parent. 300 * </p> 301 * 302 * <p> 303 * In addition, several convenience methods are offered to avoid unnecessary 304 * computations, namely {@link #getRight()} and {@link #getBottom()}. 305 * These methods return the coordinates of the right and bottom edges of the 306 * rectangle representing the view. For instance, calling {@link #getRight()} 307 * is similar to the following computation: <code>getLeft() + getWidth()</code> 308 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 309 * </p> 310 * 311 * <a name="SizePaddingMargins"></a> 312 * <h3>Size, padding and margins</h3> 313 * <p> 314 * The size of a view is expressed with a width and a height. A view actually 315 * possess two pairs of width and height values. 316 * </p> 317 * 318 * <p> 319 * The first pair is known as <em>measured width</em> and 320 * <em>measured height</em>. These dimensions define how big a view wants to be 321 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 322 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 323 * and {@link #getMeasuredHeight()}. 324 * </p> 325 * 326 * <p> 327 * The second pair is simply known as <em>width</em> and <em>height</em>, or 328 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 329 * dimensions define the actual size of the view on screen, at drawing time and 330 * after layout. These values may, but do not have to, be different from the 331 * measured width and height. The width and height can be obtained by calling 332 * {@link #getWidth()} and {@link #getHeight()}. 333 * </p> 334 * 335 * <p> 336 * To measure its dimensions, a view takes into account its padding. The padding 337 * is expressed in pixels for the left, top, right and bottom parts of the view. 338 * Padding can be used to offset the content of the view by a specific amount of 339 * pixels. For instance, a left padding of 2 will push the view's content by 340 * 2 pixels to the right of the left edge. Padding can be set using the 341 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 342 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 343 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 344 * {@link #getPaddingEnd()}. 345 * </p> 346 * 347 * <p> 348 * Even though a view can define a padding, it does not provide any support for 349 * margins. However, view groups provide such a support. Refer to 350 * {@link android.view.ViewGroup} and 351 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 352 * </p> 353 * 354 * <a name="Layout"></a> 355 * <h3>Layout</h3> 356 * <p> 357 * Layout is a two pass process: a measure pass and a layout pass. The measuring 358 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 359 * of the view tree. Each view pushes dimension specifications down the tree 360 * during the recursion. At the end of the measure pass, every view has stored 361 * its measurements. The second pass happens in 362 * {@link #layout(int,int,int,int)} and is also top-down. During 363 * this pass each parent is responsible for positioning all of its children 364 * using the sizes computed in the measure pass. 365 * </p> 366 * 367 * <p> 368 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 369 * {@link #getMeasuredHeight()} values must be set, along with those for all of 370 * that view's descendants. A view's measured width and measured height values 371 * must respect the constraints imposed by the view's parents. This guarantees 372 * that at the end of the measure pass, all parents accept all of their 373 * children's measurements. A parent view may call measure() more than once on 374 * its children. For example, the parent may measure each child once with 375 * unspecified dimensions to find out how big they want to be, then call 376 * measure() on them again with actual numbers if the sum of all the children's 377 * unconstrained sizes is too big or too small. 378 * </p> 379 * 380 * <p> 381 * The measure pass uses two classes to communicate dimensions. The 382 * {@link MeasureSpec} class is used by views to tell their parents how they 383 * want to be measured and positioned. The base LayoutParams class just 384 * describes how big the view wants to be for both width and height. For each 385 * dimension, it can specify one of: 386 * <ul> 387 * <li> an exact number 388 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 389 * (minus padding) 390 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 391 * enclose its content (plus padding). 392 * </ul> 393 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 394 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 395 * an X and Y value. 396 * </p> 397 * 398 * <p> 399 * MeasureSpecs are used to push requirements down the tree from parent to 400 * child. A MeasureSpec can be in one of three modes: 401 * <ul> 402 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 403 * of a child view. For example, a LinearLayout may call measure() on its child 404 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 405 * tall the child view wants to be given a width of 240 pixels. 406 * <li>EXACTLY: This is used by the parent to impose an exact size on the 407 * child. The child must use this size, and guarantee that all of its 408 * descendants will fit within this size. 409 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 410 * child. The child must gurantee that it and all of its descendants will fit 411 * within this size. 412 * </ul> 413 * </p> 414 * 415 * <p> 416 * To intiate a layout, call {@link #requestLayout}. This method is typically 417 * called by a view on itself when it believes that is can no longer fit within 418 * its current bounds. 419 * </p> 420 * 421 * <a name="Drawing"></a> 422 * <h3>Drawing</h3> 423 * <p> 424 * Drawing is handled by walking the tree and rendering each view that 425 * intersects the invalid region. Because the tree is traversed in-order, 426 * this means that parents will draw before (i.e., behind) their children, with 427 * siblings drawn in the order they appear in the tree. 428 * If you set a background drawable for a View, then the View will draw it for you 429 * before calling back to its <code>onDraw()</code> method. 430 * </p> 431 * 432 * <p> 433 * Note that the framework will not draw views that are not in the invalid region. 434 * </p> 435 * 436 * <p> 437 * To force a view to draw, call {@link #invalidate()}. 438 * </p> 439 * 440 * <a name="EventHandlingThreading"></a> 441 * <h3>Event Handling and Threading</h3> 442 * <p> 443 * The basic cycle of a view is as follows: 444 * <ol> 445 * <li>An event comes in and is dispatched to the appropriate view. The view 446 * handles the event and notifies any listeners.</li> 447 * <li>If in the course of processing the event, the view's bounds may need 448 * to be changed, the view will call {@link #requestLayout()}.</li> 449 * <li>Similarly, if in the course of processing the event the view's appearance 450 * may need to be changed, the view will call {@link #invalidate()}.</li> 451 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 452 * the framework will take care of measuring, laying out, and drawing the tree 453 * as appropriate.</li> 454 * </ol> 455 * </p> 456 * 457 * <p><em>Note: The entire view tree is single threaded. You must always be on 458 * the UI thread when calling any method on any view.</em> 459 * If you are doing work on other threads and want to update the state of a view 460 * from that thread, you should use a {@link Handler}. 461 * </p> 462 * 463 * <a name="FocusHandling"></a> 464 * <h3>Focus Handling</h3> 465 * <p> 466 * The framework will handle routine focus movement in response to user input. 467 * This includes changing the focus as views are removed or hidden, or as new 468 * views become available. Views indicate their willingness to take focus 469 * through the {@link #isFocusable} method. To change whether a view can take 470 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 471 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 472 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 473 * </p> 474 * <p> 475 * Focus movement is based on an algorithm which finds the nearest neighbor in a 476 * given direction. In rare cases, the default algorithm may not match the 477 * intended behavior of the developer. In these situations, you can provide 478 * explicit overrides by using these XML attributes in the layout file: 479 * <pre> 480 * nextFocusDown 481 * nextFocusLeft 482 * nextFocusRight 483 * nextFocusUp 484 * </pre> 485 * </p> 486 * 487 * 488 * <p> 489 * To get a particular view to take focus, call {@link #requestFocus()}. 490 * </p> 491 * 492 * <a name="TouchMode"></a> 493 * <h3>Touch Mode</h3> 494 * <p> 495 * When a user is navigating a user interface via directional keys such as a D-pad, it is 496 * necessary to give focus to actionable items such as buttons so the user can see 497 * what will take input. If the device has touch capabilities, however, and the user 498 * begins interacting with the interface by touching it, it is no longer necessary to 499 * always highlight, or give focus to, a particular view. This motivates a mode 500 * for interaction named 'touch mode'. 501 * </p> 502 * <p> 503 * For a touch capable device, once the user touches the screen, the device 504 * will enter touch mode. From this point onward, only views for which 505 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 506 * Other views that are touchable, like buttons, will not take focus when touched; they will 507 * only fire the on click listeners. 508 * </p> 509 * <p> 510 * Any time a user hits a directional key, such as a D-pad direction, the view device will 511 * exit touch mode, and find a view to take focus, so that the user may resume interacting 512 * with the user interface without touching the screen again. 513 * </p> 514 * <p> 515 * The touch mode state is maintained across {@link android.app.Activity}s. Call 516 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 517 * </p> 518 * 519 * <a name="Scrolling"></a> 520 * <h3>Scrolling</h3> 521 * <p> 522 * The framework provides basic support for views that wish to internally 523 * scroll their content. This includes keeping track of the X and Y scroll 524 * offset as well as mechanisms for drawing scrollbars. See 525 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 526 * {@link #awakenScrollBars()} for more details. 527 * </p> 528 * 529 * <a name="Tags"></a> 530 * <h3>Tags</h3> 531 * <p> 532 * Unlike IDs, tags are not used to identify views. Tags are essentially an 533 * extra piece of information that can be associated with a view. They are most 534 * often used as a convenience to store data related to views in the views 535 * themselves rather than by putting them in a separate structure. 536 * </p> 537 * 538 * <a name="Animation"></a> 539 * <h3>Animation</h3> 540 * <p> 541 * You can attach an {@link Animation} object to a view using 542 * {@link #setAnimation(Animation)} or 543 * {@link #startAnimation(Animation)}. The animation can alter the scale, 544 * rotation, translation and alpha of a view over time. If the animation is 545 * attached to a view that has children, the animation will affect the entire 546 * subtree rooted by that node. When an animation is started, the framework will 547 * take care of redrawing the appropriate views until the animation completes. 548 * </p> 549 * <p> 550 * Starting with Android 3.0, the preferred way of animating views is to use the 551 * {@link android.animation} package APIs. 552 * </p> 553 * 554 * <a name="Security"></a> 555 * <h3>Security</h3> 556 * <p> 557 * Sometimes it is essential that an application be able to verify that an action 558 * is being performed with the full knowledge and consent of the user, such as 559 * granting a permission request, making a purchase or clicking on an advertisement. 560 * Unfortunately, a malicious application could try to spoof the user into 561 * performing these actions, unaware, by concealing the intended purpose of the view. 562 * As a remedy, the framework offers a touch filtering mechanism that can be used to 563 * improve the security of views that provide access to sensitive functionality. 564 * </p><p> 565 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 566 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 567 * will discard touches that are received whenever the view's window is obscured by 568 * another visible window. As a result, the view will not receive touches whenever a 569 * toast, dialog or other window appears above the view's window. 570 * </p><p> 571 * For more fine-grained control over security, consider overriding the 572 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 573 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 574 * </p> 575 * 576 * @attr ref android.R.styleable#View_alpha 577 * @attr ref android.R.styleable#View_background 578 * @attr ref android.R.styleable#View_clickable 579 * @attr ref android.R.styleable#View_contentDescription 580 * @attr ref android.R.styleable#View_drawingCacheQuality 581 * @attr ref android.R.styleable#View_duplicateParentState 582 * @attr ref android.R.styleable#View_id 583 * @attr ref android.R.styleable#View_requiresFadingEdge 584 * @attr ref android.R.styleable#View_fadeScrollbars 585 * @attr ref android.R.styleable#View_fadingEdgeLength 586 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 587 * @attr ref android.R.styleable#View_fitsSystemWindows 588 * @attr ref android.R.styleable#View_isScrollContainer 589 * @attr ref android.R.styleable#View_focusable 590 * @attr ref android.R.styleable#View_focusableInTouchMode 591 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 592 * @attr ref android.R.styleable#View_keepScreenOn 593 * @attr ref android.R.styleable#View_layerType 594 * @attr ref android.R.styleable#View_longClickable 595 * @attr ref android.R.styleable#View_minHeight 596 * @attr ref android.R.styleable#View_minWidth 597 * @attr ref android.R.styleable#View_nextFocusDown 598 * @attr ref android.R.styleable#View_nextFocusLeft 599 * @attr ref android.R.styleable#View_nextFocusRight 600 * @attr ref android.R.styleable#View_nextFocusUp 601 * @attr ref android.R.styleable#View_onClick 602 * @attr ref android.R.styleable#View_padding 603 * @attr ref android.R.styleable#View_paddingBottom 604 * @attr ref android.R.styleable#View_paddingLeft 605 * @attr ref android.R.styleable#View_paddingRight 606 * @attr ref android.R.styleable#View_paddingTop 607 * @attr ref android.R.styleable#View_paddingStart 608 * @attr ref android.R.styleable#View_paddingEnd 609 * @attr ref android.R.styleable#View_saveEnabled 610 * @attr ref android.R.styleable#View_rotation 611 * @attr ref android.R.styleable#View_rotationX 612 * @attr ref android.R.styleable#View_rotationY 613 * @attr ref android.R.styleable#View_scaleX 614 * @attr ref android.R.styleable#View_scaleY 615 * @attr ref android.R.styleable#View_scrollX 616 * @attr ref android.R.styleable#View_scrollY 617 * @attr ref android.R.styleable#View_scrollbarSize 618 * @attr ref android.R.styleable#View_scrollbarStyle 619 * @attr ref android.R.styleable#View_scrollbars 620 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 621 * @attr ref android.R.styleable#View_scrollbarFadeDuration 622 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 623 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 624 * @attr ref android.R.styleable#View_scrollbarThumbVertical 625 * @attr ref android.R.styleable#View_scrollbarTrackVertical 626 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 627 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 628 * @attr ref android.R.styleable#View_soundEffectsEnabled 629 * @attr ref android.R.styleable#View_tag 630 * @attr ref android.R.styleable#View_textAlignment 631 * @attr ref android.R.styleable#View_transformPivotX 632 * @attr ref android.R.styleable#View_transformPivotY 633 * @attr ref android.R.styleable#View_translationX 634 * @attr ref android.R.styleable#View_translationY 635 * @attr ref android.R.styleable#View_visibility 636 * 637 * @see android.view.ViewGroup 638 */ 639public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 640 AccessibilityEventSource { 641 private static final boolean DBG = false; 642 643 /** 644 * The logging tag used by this class with android.util.Log. 645 */ 646 protected static final String VIEW_LOG_TAG = "View"; 647 648 /** 649 * Used to mark a View that has no ID. 650 */ 651 public static final int NO_ID = -1; 652 653 /** 654 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 655 * calling setFlags. 656 */ 657 private static final int NOT_FOCUSABLE = 0x00000000; 658 659 /** 660 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 661 * setFlags. 662 */ 663 private static final int FOCUSABLE = 0x00000001; 664 665 /** 666 * Mask for use with setFlags indicating bits used for focus. 667 */ 668 private static final int FOCUSABLE_MASK = 0x00000001; 669 670 /** 671 * This view will adjust its padding to fit sytem windows (e.g. status bar) 672 */ 673 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 674 675 /** 676 * This view is visible. 677 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 678 * android:visibility}. 679 */ 680 public static final int VISIBLE = 0x00000000; 681 682 /** 683 * This view is invisible, but it still takes up space for layout purposes. 684 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 685 * android:visibility}. 686 */ 687 public static final int INVISIBLE = 0x00000004; 688 689 /** 690 * This view is invisible, and it doesn't take any space for layout 691 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 692 * android:visibility}. 693 */ 694 public static final int GONE = 0x00000008; 695 696 /** 697 * Mask for use with setFlags indicating bits used for visibility. 698 * {@hide} 699 */ 700 static final int VISIBILITY_MASK = 0x0000000C; 701 702 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 703 704 /** 705 * This view is enabled. Interpretation varies by subclass. 706 * Use with ENABLED_MASK when calling setFlags. 707 * {@hide} 708 */ 709 static final int ENABLED = 0x00000000; 710 711 /** 712 * This view is disabled. Interpretation varies by subclass. 713 * Use with ENABLED_MASK when calling setFlags. 714 * {@hide} 715 */ 716 static final int DISABLED = 0x00000020; 717 718 /** 719 * Mask for use with setFlags indicating bits used for indicating whether 720 * this view is enabled 721 * {@hide} 722 */ 723 static final int ENABLED_MASK = 0x00000020; 724 725 /** 726 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 727 * called and further optimizations will be performed. It is okay to have 728 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 729 * {@hide} 730 */ 731 static final int WILL_NOT_DRAW = 0x00000080; 732 733 /** 734 * Mask for use with setFlags indicating bits used for indicating whether 735 * this view is will draw 736 * {@hide} 737 */ 738 static final int DRAW_MASK = 0x00000080; 739 740 /** 741 * <p>This view doesn't show scrollbars.</p> 742 * {@hide} 743 */ 744 static final int SCROLLBARS_NONE = 0x00000000; 745 746 /** 747 * <p>This view shows horizontal scrollbars.</p> 748 * {@hide} 749 */ 750 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 751 752 /** 753 * <p>This view shows vertical scrollbars.</p> 754 * {@hide} 755 */ 756 static final int SCROLLBARS_VERTICAL = 0x00000200; 757 758 /** 759 * <p>Mask for use with setFlags indicating bits used for indicating which 760 * scrollbars are enabled.</p> 761 * {@hide} 762 */ 763 static final int SCROLLBARS_MASK = 0x00000300; 764 765 /** 766 * Indicates that the view should filter touches when its window is obscured. 767 * Refer to the class comments for more information about this security feature. 768 * {@hide} 769 */ 770 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 771 772 /** 773 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 774 * that they are optional and should be skipped if the window has 775 * requested system UI flags that ignore those insets for layout. 776 */ 777 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 778 779 /** 780 * <p>This view doesn't show fading edges.</p> 781 * {@hide} 782 */ 783 static final int FADING_EDGE_NONE = 0x00000000; 784 785 /** 786 * <p>This view shows horizontal fading edges.</p> 787 * {@hide} 788 */ 789 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 790 791 /** 792 * <p>This view shows vertical fading edges.</p> 793 * {@hide} 794 */ 795 static final int FADING_EDGE_VERTICAL = 0x00002000; 796 797 /** 798 * <p>Mask for use with setFlags indicating bits used for indicating which 799 * fading edges are enabled.</p> 800 * {@hide} 801 */ 802 static final int FADING_EDGE_MASK = 0x00003000; 803 804 /** 805 * <p>Indicates this view can be clicked. When clickable, a View reacts 806 * to clicks by notifying the OnClickListener.<p> 807 * {@hide} 808 */ 809 static final int CLICKABLE = 0x00004000; 810 811 /** 812 * <p>Indicates this view is caching its drawing into a bitmap.</p> 813 * {@hide} 814 */ 815 static final int DRAWING_CACHE_ENABLED = 0x00008000; 816 817 /** 818 * <p>Indicates that no icicle should be saved for this view.<p> 819 * {@hide} 820 */ 821 static final int SAVE_DISABLED = 0x000010000; 822 823 /** 824 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 825 * property.</p> 826 * {@hide} 827 */ 828 static final int SAVE_DISABLED_MASK = 0x000010000; 829 830 /** 831 * <p>Indicates that no drawing cache should ever be created for this view.<p> 832 * {@hide} 833 */ 834 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 835 836 /** 837 * <p>Indicates this view can take / keep focus when int touch mode.</p> 838 * {@hide} 839 */ 840 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 841 842 /** 843 * <p>Enables low quality mode for the drawing cache.</p> 844 */ 845 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 846 847 /** 848 * <p>Enables high quality mode for the drawing cache.</p> 849 */ 850 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 851 852 /** 853 * <p>Enables automatic quality mode for the drawing cache.</p> 854 */ 855 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 856 857 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 858 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 859 }; 860 861 /** 862 * <p>Mask for use with setFlags indicating bits used for the cache 863 * quality property.</p> 864 * {@hide} 865 */ 866 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 867 868 /** 869 * <p> 870 * Indicates this view can be long clicked. When long clickable, a View 871 * reacts to long clicks by notifying the OnLongClickListener or showing a 872 * context menu. 873 * </p> 874 * {@hide} 875 */ 876 static final int LONG_CLICKABLE = 0x00200000; 877 878 /** 879 * <p>Indicates that this view gets its drawable states from its direct parent 880 * and ignores its original internal states.</p> 881 * 882 * @hide 883 */ 884 static final int DUPLICATE_PARENT_STATE = 0x00400000; 885 886 /** 887 * The scrollbar style to display the scrollbars inside the content area, 888 * without increasing the padding. The scrollbars will be overlaid with 889 * translucency on the view's content. 890 */ 891 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 892 893 /** 894 * The scrollbar style to display the scrollbars inside the padded area, 895 * increasing the padding of the view. The scrollbars will not overlap the 896 * content area of the view. 897 */ 898 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 899 900 /** 901 * The scrollbar style to display the scrollbars at the edge of the view, 902 * without increasing the padding. The scrollbars will be overlaid with 903 * translucency. 904 */ 905 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 906 907 /** 908 * The scrollbar style to display the scrollbars at the edge of the view, 909 * increasing the padding of the view. The scrollbars will only overlap the 910 * background, if any. 911 */ 912 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 913 914 /** 915 * Mask to check if the scrollbar style is overlay or inset. 916 * {@hide} 917 */ 918 static final int SCROLLBARS_INSET_MASK = 0x01000000; 919 920 /** 921 * Mask to check if the scrollbar style is inside or outside. 922 * {@hide} 923 */ 924 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 925 926 /** 927 * Mask for scrollbar style. 928 * {@hide} 929 */ 930 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 931 932 /** 933 * View flag indicating that the screen should remain on while the 934 * window containing this view is visible to the user. This effectively 935 * takes care of automatically setting the WindowManager's 936 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 937 */ 938 public static final int KEEP_SCREEN_ON = 0x04000000; 939 940 /** 941 * View flag indicating whether this view should have sound effects enabled 942 * for events such as clicking and touching. 943 */ 944 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 945 946 /** 947 * View flag indicating whether this view should have haptic feedback 948 * enabled for events such as long presses. 949 */ 950 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 951 952 /** 953 * <p>Indicates that the view hierarchy should stop saving state when 954 * it reaches this view. If state saving is initiated immediately at 955 * the view, it will be allowed. 956 * {@hide} 957 */ 958 static final int PARENT_SAVE_DISABLED = 0x20000000; 959 960 /** 961 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 962 * {@hide} 963 */ 964 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 965 966 /** 967 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 968 * should add all focusable Views regardless if they are focusable in touch mode. 969 */ 970 public static final int FOCUSABLES_ALL = 0x00000000; 971 972 /** 973 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 974 * should add only Views focusable in touch mode. 975 */ 976 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 977 978 /** 979 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 980 * should add only accessibility focusable Views. 981 * 982 * @hide 983 */ 984 public static final int FOCUSABLES_ACCESSIBILITY = 0x00000002; 985 986 /** 987 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 988 * item. 989 */ 990 public static final int FOCUS_BACKWARD = 0x00000001; 991 992 /** 993 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 994 * item. 995 */ 996 public static final int FOCUS_FORWARD = 0x00000002; 997 998 /** 999 * Use with {@link #focusSearch(int)}. Move focus to the left. 1000 */ 1001 public static final int FOCUS_LEFT = 0x00000011; 1002 1003 /** 1004 * Use with {@link #focusSearch(int)}. Move focus up. 1005 */ 1006 public static final int FOCUS_UP = 0x00000021; 1007 1008 /** 1009 * Use with {@link #focusSearch(int)}. Move focus to the right. 1010 */ 1011 public static final int FOCUS_RIGHT = 0x00000042; 1012 1013 /** 1014 * Use with {@link #focusSearch(int)}. Move focus down. 1015 */ 1016 public static final int FOCUS_DOWN = 0x00000082; 1017 1018 // Accessibility focus directions. 1019 1020 /** 1021 * The accessibility focus which is the current user position when 1022 * interacting with the accessibility framework. 1023 */ 1024 public static final int FOCUS_ACCESSIBILITY = 0x00001000; 1025 1026 /** 1027 * Use with {@link #focusSearch(int)}. Move acessibility focus left. 1028 */ 1029 public static final int ACCESSIBILITY_FOCUS_LEFT = FOCUS_LEFT | FOCUS_ACCESSIBILITY; 1030 1031 /** 1032 * Use with {@link #focusSearch(int)}. Move acessibility focus up. 1033 */ 1034 public static final int ACCESSIBILITY_FOCUS_UP = FOCUS_UP | FOCUS_ACCESSIBILITY; 1035 1036 /** 1037 * Use with {@link #focusSearch(int)}. Move acessibility focus right. 1038 */ 1039 public static final int ACCESSIBILITY_FOCUS_RIGHT = FOCUS_RIGHT | FOCUS_ACCESSIBILITY; 1040 1041 /** 1042 * Use with {@link #focusSearch(int)}. Move acessibility focus down. 1043 */ 1044 public static final int ACCESSIBILITY_FOCUS_DOWN = FOCUS_DOWN | FOCUS_ACCESSIBILITY; 1045 1046 /** 1047 * Use with {@link #focusSearch(int)}. Move acessibility focus to the next view. 1048 */ 1049 public static final int ACCESSIBILITY_FOCUS_FORWARD = FOCUS_FORWARD | FOCUS_ACCESSIBILITY; 1050 1051 /** 1052 * Use with {@link #focusSearch(int)}. Move acessibility focus to the previous view. 1053 */ 1054 public static final int ACCESSIBILITY_FOCUS_BACKWARD = FOCUS_BACKWARD | FOCUS_ACCESSIBILITY; 1055 1056 /** 1057 * Use with {@link #focusSearch(int)}. Move acessibility focus in a view. 1058 */ 1059 public static final int ACCESSIBILITY_FOCUS_IN = 0x00000004 | FOCUS_ACCESSIBILITY; 1060 1061 /** 1062 * Use with {@link #focusSearch(int)}. Move acessibility focus out of a view. 1063 */ 1064 public static final int ACCESSIBILITY_FOCUS_OUT = 0x00000008 | FOCUS_ACCESSIBILITY; 1065 1066 /** 1067 * Bits of {@link #getMeasuredWidthAndState()} and 1068 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1069 */ 1070 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1071 1072 /** 1073 * Bits of {@link #getMeasuredWidthAndState()} and 1074 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1075 */ 1076 public static final int MEASURED_STATE_MASK = 0xff000000; 1077 1078 /** 1079 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1080 * for functions that combine both width and height into a single int, 1081 * such as {@link #getMeasuredState()} and the childState argument of 1082 * {@link #resolveSizeAndState(int, int, int)}. 1083 */ 1084 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1085 1086 /** 1087 * Bit of {@link #getMeasuredWidthAndState()} and 1088 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1089 * is smaller that the space the view would like to have. 1090 */ 1091 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1092 1093 /** 1094 * Base View state sets 1095 */ 1096 // Singles 1097 /** 1098 * Indicates the view has no states set. States are used with 1099 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1100 * view depending on its state. 1101 * 1102 * @see android.graphics.drawable.Drawable 1103 * @see #getDrawableState() 1104 */ 1105 protected static final int[] EMPTY_STATE_SET; 1106 /** 1107 * Indicates the view is enabled. States are used with 1108 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1109 * view depending on its state. 1110 * 1111 * @see android.graphics.drawable.Drawable 1112 * @see #getDrawableState() 1113 */ 1114 protected static final int[] ENABLED_STATE_SET; 1115 /** 1116 * Indicates the view is focused. States are used with 1117 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1118 * view depending on its state. 1119 * 1120 * @see android.graphics.drawable.Drawable 1121 * @see #getDrawableState() 1122 */ 1123 protected static final int[] FOCUSED_STATE_SET; 1124 /** 1125 * Indicates the view is selected. States are used with 1126 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1127 * view depending on its state. 1128 * 1129 * @see android.graphics.drawable.Drawable 1130 * @see #getDrawableState() 1131 */ 1132 protected static final int[] SELECTED_STATE_SET; 1133 /** 1134 * Indicates the view is pressed. States are used with 1135 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1136 * view depending on its state. 1137 * 1138 * @see android.graphics.drawable.Drawable 1139 * @see #getDrawableState() 1140 * @hide 1141 */ 1142 protected static final int[] PRESSED_STATE_SET; 1143 /** 1144 * Indicates the view's window has focus. States are used with 1145 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1146 * view depending on its state. 1147 * 1148 * @see android.graphics.drawable.Drawable 1149 * @see #getDrawableState() 1150 */ 1151 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1152 // Doubles 1153 /** 1154 * Indicates the view is enabled and has the focus. 1155 * 1156 * @see #ENABLED_STATE_SET 1157 * @see #FOCUSED_STATE_SET 1158 */ 1159 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1160 /** 1161 * Indicates the view is enabled and selected. 1162 * 1163 * @see #ENABLED_STATE_SET 1164 * @see #SELECTED_STATE_SET 1165 */ 1166 protected static final int[] ENABLED_SELECTED_STATE_SET; 1167 /** 1168 * Indicates the view is enabled and that its window has focus. 1169 * 1170 * @see #ENABLED_STATE_SET 1171 * @see #WINDOW_FOCUSED_STATE_SET 1172 */ 1173 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1174 /** 1175 * Indicates the view is focused and selected. 1176 * 1177 * @see #FOCUSED_STATE_SET 1178 * @see #SELECTED_STATE_SET 1179 */ 1180 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1181 /** 1182 * Indicates the view has the focus and that its window has the focus. 1183 * 1184 * @see #FOCUSED_STATE_SET 1185 * @see #WINDOW_FOCUSED_STATE_SET 1186 */ 1187 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1188 /** 1189 * Indicates the view is selected and that its window has the focus. 1190 * 1191 * @see #SELECTED_STATE_SET 1192 * @see #WINDOW_FOCUSED_STATE_SET 1193 */ 1194 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1195 // Triples 1196 /** 1197 * Indicates the view is enabled, focused and selected. 1198 * 1199 * @see #ENABLED_STATE_SET 1200 * @see #FOCUSED_STATE_SET 1201 * @see #SELECTED_STATE_SET 1202 */ 1203 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1204 /** 1205 * Indicates the view is enabled, focused and its window has the focus. 1206 * 1207 * @see #ENABLED_STATE_SET 1208 * @see #FOCUSED_STATE_SET 1209 * @see #WINDOW_FOCUSED_STATE_SET 1210 */ 1211 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1212 /** 1213 * Indicates the view is enabled, selected and its window has the focus. 1214 * 1215 * @see #ENABLED_STATE_SET 1216 * @see #SELECTED_STATE_SET 1217 * @see #WINDOW_FOCUSED_STATE_SET 1218 */ 1219 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1220 /** 1221 * Indicates the view is focused, selected and its window has the focus. 1222 * 1223 * @see #FOCUSED_STATE_SET 1224 * @see #SELECTED_STATE_SET 1225 * @see #WINDOW_FOCUSED_STATE_SET 1226 */ 1227 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1228 /** 1229 * Indicates the view is enabled, focused, selected and its window 1230 * has the focus. 1231 * 1232 * @see #ENABLED_STATE_SET 1233 * @see #FOCUSED_STATE_SET 1234 * @see #SELECTED_STATE_SET 1235 * @see #WINDOW_FOCUSED_STATE_SET 1236 */ 1237 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1238 /** 1239 * Indicates the view is pressed and its window has the focus. 1240 * 1241 * @see #PRESSED_STATE_SET 1242 * @see #WINDOW_FOCUSED_STATE_SET 1243 */ 1244 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1245 /** 1246 * Indicates the view is pressed and selected. 1247 * 1248 * @see #PRESSED_STATE_SET 1249 * @see #SELECTED_STATE_SET 1250 */ 1251 protected static final int[] PRESSED_SELECTED_STATE_SET; 1252 /** 1253 * Indicates the view is pressed, selected and its window has the focus. 1254 * 1255 * @see #PRESSED_STATE_SET 1256 * @see #SELECTED_STATE_SET 1257 * @see #WINDOW_FOCUSED_STATE_SET 1258 */ 1259 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1260 /** 1261 * Indicates the view is pressed and focused. 1262 * 1263 * @see #PRESSED_STATE_SET 1264 * @see #FOCUSED_STATE_SET 1265 */ 1266 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1267 /** 1268 * Indicates the view is pressed, focused and its window has the focus. 1269 * 1270 * @see #PRESSED_STATE_SET 1271 * @see #FOCUSED_STATE_SET 1272 * @see #WINDOW_FOCUSED_STATE_SET 1273 */ 1274 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1275 /** 1276 * Indicates the view is pressed, focused and selected. 1277 * 1278 * @see #PRESSED_STATE_SET 1279 * @see #SELECTED_STATE_SET 1280 * @see #FOCUSED_STATE_SET 1281 */ 1282 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1283 /** 1284 * Indicates the view is pressed, focused, selected and its window has the focus. 1285 * 1286 * @see #PRESSED_STATE_SET 1287 * @see #FOCUSED_STATE_SET 1288 * @see #SELECTED_STATE_SET 1289 * @see #WINDOW_FOCUSED_STATE_SET 1290 */ 1291 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1292 /** 1293 * Indicates the view is pressed and enabled. 1294 * 1295 * @see #PRESSED_STATE_SET 1296 * @see #ENABLED_STATE_SET 1297 */ 1298 protected static final int[] PRESSED_ENABLED_STATE_SET; 1299 /** 1300 * Indicates the view is pressed, enabled and its window has the focus. 1301 * 1302 * @see #PRESSED_STATE_SET 1303 * @see #ENABLED_STATE_SET 1304 * @see #WINDOW_FOCUSED_STATE_SET 1305 */ 1306 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1307 /** 1308 * Indicates the view is pressed, enabled and selected. 1309 * 1310 * @see #PRESSED_STATE_SET 1311 * @see #ENABLED_STATE_SET 1312 * @see #SELECTED_STATE_SET 1313 */ 1314 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1315 /** 1316 * Indicates the view is pressed, enabled, selected and its window has the 1317 * focus. 1318 * 1319 * @see #PRESSED_STATE_SET 1320 * @see #ENABLED_STATE_SET 1321 * @see #SELECTED_STATE_SET 1322 * @see #WINDOW_FOCUSED_STATE_SET 1323 */ 1324 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1325 /** 1326 * Indicates the view is pressed, enabled and focused. 1327 * 1328 * @see #PRESSED_STATE_SET 1329 * @see #ENABLED_STATE_SET 1330 * @see #FOCUSED_STATE_SET 1331 */ 1332 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1333 /** 1334 * Indicates the view is pressed, enabled, focused and its window has the 1335 * focus. 1336 * 1337 * @see #PRESSED_STATE_SET 1338 * @see #ENABLED_STATE_SET 1339 * @see #FOCUSED_STATE_SET 1340 * @see #WINDOW_FOCUSED_STATE_SET 1341 */ 1342 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1343 /** 1344 * Indicates the view is pressed, enabled, focused and selected. 1345 * 1346 * @see #PRESSED_STATE_SET 1347 * @see #ENABLED_STATE_SET 1348 * @see #SELECTED_STATE_SET 1349 * @see #FOCUSED_STATE_SET 1350 */ 1351 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1352 /** 1353 * Indicates the view is pressed, enabled, focused, selected and its window 1354 * has the focus. 1355 * 1356 * @see #PRESSED_STATE_SET 1357 * @see #ENABLED_STATE_SET 1358 * @see #SELECTED_STATE_SET 1359 * @see #FOCUSED_STATE_SET 1360 * @see #WINDOW_FOCUSED_STATE_SET 1361 */ 1362 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1363 1364 /** 1365 * The order here is very important to {@link #getDrawableState()} 1366 */ 1367 private static final int[][] VIEW_STATE_SETS; 1368 1369 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1370 static final int VIEW_STATE_SELECTED = 1 << 1; 1371 static final int VIEW_STATE_FOCUSED = 1 << 2; 1372 static final int VIEW_STATE_ENABLED = 1 << 3; 1373 static final int VIEW_STATE_PRESSED = 1 << 4; 1374 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1375 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1376 static final int VIEW_STATE_HOVERED = 1 << 7; 1377 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1378 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1379 1380 static final int[] VIEW_STATE_IDS = new int[] { 1381 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1382 R.attr.state_selected, VIEW_STATE_SELECTED, 1383 R.attr.state_focused, VIEW_STATE_FOCUSED, 1384 R.attr.state_enabled, VIEW_STATE_ENABLED, 1385 R.attr.state_pressed, VIEW_STATE_PRESSED, 1386 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1387 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1388 R.attr.state_hovered, VIEW_STATE_HOVERED, 1389 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1390 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1391 }; 1392 1393 static { 1394 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1395 throw new IllegalStateException( 1396 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1397 } 1398 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1399 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1400 int viewState = R.styleable.ViewDrawableStates[i]; 1401 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1402 if (VIEW_STATE_IDS[j] == viewState) { 1403 orderedIds[i * 2] = viewState; 1404 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1405 } 1406 } 1407 } 1408 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1409 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1410 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1411 int numBits = Integer.bitCount(i); 1412 int[] set = new int[numBits]; 1413 int pos = 0; 1414 for (int j = 0; j < orderedIds.length; j += 2) { 1415 if ((i & orderedIds[j+1]) != 0) { 1416 set[pos++] = orderedIds[j]; 1417 } 1418 } 1419 VIEW_STATE_SETS[i] = set; 1420 } 1421 1422 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1423 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1424 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1425 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1426 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1427 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1428 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1429 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1430 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1431 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1432 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1433 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1434 | VIEW_STATE_FOCUSED]; 1435 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1436 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1437 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1438 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1439 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1440 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1441 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1442 | VIEW_STATE_ENABLED]; 1443 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1444 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1445 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1446 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1447 | VIEW_STATE_ENABLED]; 1448 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1449 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1450 | VIEW_STATE_ENABLED]; 1451 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1452 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1453 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1454 1455 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1456 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1457 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1458 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1459 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1460 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1462 | VIEW_STATE_PRESSED]; 1463 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1464 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1465 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1467 | VIEW_STATE_PRESSED]; 1468 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1469 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1470 | VIEW_STATE_PRESSED]; 1471 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1472 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1473 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1474 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1475 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1476 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1477 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1478 | VIEW_STATE_PRESSED]; 1479 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1480 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1481 | VIEW_STATE_PRESSED]; 1482 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1483 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1484 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1485 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1486 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1487 | VIEW_STATE_PRESSED]; 1488 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1489 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1490 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1491 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1492 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1493 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1494 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1495 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1496 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1497 | VIEW_STATE_PRESSED]; 1498 } 1499 1500 /** 1501 * Accessibility event types that are dispatched for text population. 1502 */ 1503 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1504 AccessibilityEvent.TYPE_VIEW_CLICKED 1505 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1506 | AccessibilityEvent.TYPE_VIEW_SELECTED 1507 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1508 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1509 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1510 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1511 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1512 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1513 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED; 1514 1515 /** 1516 * Temporary Rect currently for use in setBackground(). This will probably 1517 * be extended in the future to hold our own class with more than just 1518 * a Rect. :) 1519 */ 1520 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1521 1522 /** 1523 * Temporary flag, used to enable processing of View properties in the native DisplayList 1524 * object instead of during draw(). Soon to be enabled by default for hardware-accelerated 1525 * apps. 1526 * @hide 1527 */ 1528 public static final boolean USE_DISPLAY_LIST_PROPERTIES = true; 1529 1530 /** 1531 * Map used to store views' tags. 1532 */ 1533 private SparseArray<Object> mKeyedTags; 1534 1535 /** 1536 * The next available accessiiblity id. 1537 */ 1538 private static int sNextAccessibilityViewId; 1539 1540 /** 1541 * The animation currently associated with this view. 1542 * @hide 1543 */ 1544 protected Animation mCurrentAnimation = null; 1545 1546 /** 1547 * Width as measured during measure pass. 1548 * {@hide} 1549 */ 1550 @ViewDebug.ExportedProperty(category = "measurement") 1551 int mMeasuredWidth; 1552 1553 /** 1554 * Height as measured during measure pass. 1555 * {@hide} 1556 */ 1557 @ViewDebug.ExportedProperty(category = "measurement") 1558 int mMeasuredHeight; 1559 1560 /** 1561 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1562 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1563 * its display list. This flag, used only when hw accelerated, allows us to clear the 1564 * flag while retaining this information until it's needed (at getDisplayList() time and 1565 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1566 * 1567 * {@hide} 1568 */ 1569 boolean mRecreateDisplayList = false; 1570 1571 /** 1572 * The view's identifier. 1573 * {@hide} 1574 * 1575 * @see #setId(int) 1576 * @see #getId() 1577 */ 1578 @ViewDebug.ExportedProperty(resolveId = true) 1579 int mID = NO_ID; 1580 1581 /** 1582 * The stable ID of this view for accessibility purposes. 1583 */ 1584 int mAccessibilityViewId = NO_ID; 1585 1586 /** 1587 * The view's tag. 1588 * {@hide} 1589 * 1590 * @see #setTag(Object) 1591 * @see #getTag() 1592 */ 1593 protected Object mTag; 1594 1595 // for mPrivateFlags: 1596 /** {@hide} */ 1597 static final int WANTS_FOCUS = 0x00000001; 1598 /** {@hide} */ 1599 static final int FOCUSED = 0x00000002; 1600 /** {@hide} */ 1601 static final int SELECTED = 0x00000004; 1602 /** {@hide} */ 1603 static final int IS_ROOT_NAMESPACE = 0x00000008; 1604 /** {@hide} */ 1605 static final int HAS_BOUNDS = 0x00000010; 1606 /** {@hide} */ 1607 static final int DRAWN = 0x00000020; 1608 /** 1609 * When this flag is set, this view is running an animation on behalf of its 1610 * children and should therefore not cancel invalidate requests, even if they 1611 * lie outside of this view's bounds. 1612 * 1613 * {@hide} 1614 */ 1615 static final int DRAW_ANIMATION = 0x00000040; 1616 /** {@hide} */ 1617 static final int SKIP_DRAW = 0x00000080; 1618 /** {@hide} */ 1619 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1620 /** {@hide} */ 1621 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1622 /** {@hide} */ 1623 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1624 /** {@hide} */ 1625 static final int MEASURED_DIMENSION_SET = 0x00000800; 1626 /** {@hide} */ 1627 static final int FORCE_LAYOUT = 0x00001000; 1628 /** {@hide} */ 1629 static final int LAYOUT_REQUIRED = 0x00002000; 1630 1631 private static final int PRESSED = 0x00004000; 1632 1633 /** {@hide} */ 1634 static final int DRAWING_CACHE_VALID = 0x00008000; 1635 /** 1636 * Flag used to indicate that this view should be drawn once more (and only once 1637 * more) after its animation has completed. 1638 * {@hide} 1639 */ 1640 static final int ANIMATION_STARTED = 0x00010000; 1641 1642 private static final int SAVE_STATE_CALLED = 0x00020000; 1643 1644 /** 1645 * Indicates that the View returned true when onSetAlpha() was called and that 1646 * the alpha must be restored. 1647 * {@hide} 1648 */ 1649 static final int ALPHA_SET = 0x00040000; 1650 1651 /** 1652 * Set by {@link #setScrollContainer(boolean)}. 1653 */ 1654 static final int SCROLL_CONTAINER = 0x00080000; 1655 1656 /** 1657 * Set by {@link #setScrollContainer(boolean)}. 1658 */ 1659 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1660 1661 /** 1662 * View flag indicating whether this view was invalidated (fully or partially.) 1663 * 1664 * @hide 1665 */ 1666 static final int DIRTY = 0x00200000; 1667 1668 /** 1669 * View flag indicating whether this view was invalidated by an opaque 1670 * invalidate request. 1671 * 1672 * @hide 1673 */ 1674 static final int DIRTY_OPAQUE = 0x00400000; 1675 1676 /** 1677 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1678 * 1679 * @hide 1680 */ 1681 static final int DIRTY_MASK = 0x00600000; 1682 1683 /** 1684 * Indicates whether the background is opaque. 1685 * 1686 * @hide 1687 */ 1688 static final int OPAQUE_BACKGROUND = 0x00800000; 1689 1690 /** 1691 * Indicates whether the scrollbars are opaque. 1692 * 1693 * @hide 1694 */ 1695 static final int OPAQUE_SCROLLBARS = 0x01000000; 1696 1697 /** 1698 * Indicates whether the view is opaque. 1699 * 1700 * @hide 1701 */ 1702 static final int OPAQUE_MASK = 0x01800000; 1703 1704 /** 1705 * Indicates a prepressed state; 1706 * the short time between ACTION_DOWN and recognizing 1707 * a 'real' press. Prepressed is used to recognize quick taps 1708 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1709 * 1710 * @hide 1711 */ 1712 private static final int PREPRESSED = 0x02000000; 1713 1714 /** 1715 * Indicates whether the view is temporarily detached. 1716 * 1717 * @hide 1718 */ 1719 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1720 1721 /** 1722 * Indicates that we should awaken scroll bars once attached 1723 * 1724 * @hide 1725 */ 1726 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1727 1728 /** 1729 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1730 * @hide 1731 */ 1732 private static final int HOVERED = 0x10000000; 1733 1734 /** 1735 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1736 * for transform operations 1737 * 1738 * @hide 1739 */ 1740 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1741 1742 /** {@hide} */ 1743 static final int ACTIVATED = 0x40000000; 1744 1745 /** 1746 * Indicates that this view was specifically invalidated, not just dirtied because some 1747 * child view was invalidated. The flag is used to determine when we need to recreate 1748 * a view's display list (as opposed to just returning a reference to its existing 1749 * display list). 1750 * 1751 * @hide 1752 */ 1753 static final int INVALIDATED = 0x80000000; 1754 1755 /* Masks for mPrivateFlags2 */ 1756 1757 /** 1758 * Indicates that this view has reported that it can accept the current drag's content. 1759 * Cleared when the drag operation concludes. 1760 * @hide 1761 */ 1762 static final int DRAG_CAN_ACCEPT = 0x00000001; 1763 1764 /** 1765 * Indicates that this view is currently directly under the drag location in a 1766 * drag-and-drop operation involving content that it can accept. Cleared when 1767 * the drag exits the view, or when the drag operation concludes. 1768 * @hide 1769 */ 1770 static final int DRAG_HOVERED = 0x00000002; 1771 1772 /** 1773 * Horizontal layout direction of this view is from Left to Right. 1774 * Use with {@link #setLayoutDirection}. 1775 */ 1776 public static final int LAYOUT_DIRECTION_LTR = 0; 1777 1778 /** 1779 * Horizontal layout direction of this view is from Right to Left. 1780 * Use with {@link #setLayoutDirection}. 1781 */ 1782 public static final int LAYOUT_DIRECTION_RTL = 1; 1783 1784 /** 1785 * Horizontal layout direction of this view is inherited from its parent. 1786 * Use with {@link #setLayoutDirection}. 1787 */ 1788 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1789 1790 /** 1791 * Horizontal layout direction of this view is from deduced from the default language 1792 * script for the locale. Use with {@link #setLayoutDirection}. 1793 */ 1794 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1795 1796 /** 1797 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1798 * @hide 1799 */ 1800 static final int LAYOUT_DIRECTION_MASK_SHIFT = 2; 1801 1802 /** 1803 * Mask for use with private flags indicating bits used for horizontal layout direction. 1804 * @hide 1805 */ 1806 static final int LAYOUT_DIRECTION_MASK = 0x00000003 << LAYOUT_DIRECTION_MASK_SHIFT; 1807 1808 /** 1809 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1810 * right-to-left direction. 1811 * @hide 1812 */ 1813 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 4 << LAYOUT_DIRECTION_MASK_SHIFT; 1814 1815 /** 1816 * Indicates whether the view horizontal layout direction has been resolved. 1817 * @hide 1818 */ 1819 static final int LAYOUT_DIRECTION_RESOLVED = 8 << LAYOUT_DIRECTION_MASK_SHIFT; 1820 1821 /** 1822 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1823 * @hide 1824 */ 1825 static final int LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C << LAYOUT_DIRECTION_MASK_SHIFT; 1826 1827 /* 1828 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1829 * flag value. 1830 * @hide 1831 */ 1832 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1833 LAYOUT_DIRECTION_LTR, 1834 LAYOUT_DIRECTION_RTL, 1835 LAYOUT_DIRECTION_INHERIT, 1836 LAYOUT_DIRECTION_LOCALE 1837 }; 1838 1839 /** 1840 * Default horizontal layout direction. 1841 * @hide 1842 */ 1843 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1844 1845 /** 1846 * Indicates that the view is tracking some sort of transient state 1847 * that the app should not need to be aware of, but that the framework 1848 * should take special care to preserve. 1849 * 1850 * @hide 1851 */ 1852 static final int HAS_TRANSIENT_STATE = 0x00000100; 1853 1854 1855 /** 1856 * Text direction is inherited thru {@link ViewGroup} 1857 */ 1858 public static final int TEXT_DIRECTION_INHERIT = 0; 1859 1860 /** 1861 * Text direction is using "first strong algorithm". The first strong directional character 1862 * determines the paragraph direction. If there is no strong directional character, the 1863 * paragraph direction is the view's resolved layout direction. 1864 */ 1865 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1866 1867 /** 1868 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1869 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1870 * If there are neither, the paragraph direction is the view's resolved layout direction. 1871 */ 1872 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1873 1874 /** 1875 * Text direction is forced to LTR. 1876 */ 1877 public static final int TEXT_DIRECTION_LTR = 3; 1878 1879 /** 1880 * Text direction is forced to RTL. 1881 */ 1882 public static final int TEXT_DIRECTION_RTL = 4; 1883 1884 /** 1885 * Text direction is coming from the system Locale. 1886 */ 1887 public static final int TEXT_DIRECTION_LOCALE = 5; 1888 1889 /** 1890 * Default text direction is inherited 1891 */ 1892 protected static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1893 1894 /** 1895 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1896 * @hide 1897 */ 1898 static final int TEXT_DIRECTION_MASK_SHIFT = 6; 1899 1900 /** 1901 * Mask for use with private flags indicating bits used for text direction. 1902 * @hide 1903 */ 1904 static final int TEXT_DIRECTION_MASK = 0x00000007 << TEXT_DIRECTION_MASK_SHIFT; 1905 1906 /** 1907 * Array of text direction flags for mapping attribute "textDirection" to correct 1908 * flag value. 1909 * @hide 1910 */ 1911 private static final int[] TEXT_DIRECTION_FLAGS = { 1912 TEXT_DIRECTION_INHERIT << TEXT_DIRECTION_MASK_SHIFT, 1913 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_MASK_SHIFT, 1914 TEXT_DIRECTION_ANY_RTL << TEXT_DIRECTION_MASK_SHIFT, 1915 TEXT_DIRECTION_LTR << TEXT_DIRECTION_MASK_SHIFT, 1916 TEXT_DIRECTION_RTL << TEXT_DIRECTION_MASK_SHIFT, 1917 TEXT_DIRECTION_LOCALE << TEXT_DIRECTION_MASK_SHIFT 1918 }; 1919 1920 /** 1921 * Indicates whether the view text direction has been resolved. 1922 * @hide 1923 */ 1924 static final int TEXT_DIRECTION_RESOLVED = 0x00000008 << TEXT_DIRECTION_MASK_SHIFT; 1925 1926 /** 1927 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1928 * @hide 1929 */ 1930 static final int TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1931 1932 /** 1933 * Mask for use with private flags indicating bits used for resolved text direction. 1934 * @hide 1935 */ 1936 static final int TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1937 1938 /** 1939 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1940 * @hide 1941 */ 1942 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = 1943 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1944 1945 /* 1946 * Default text alignment. The text alignment of this View is inherited from its parent. 1947 * Use with {@link #setTextAlignment(int)} 1948 */ 1949 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1950 1951 /** 1952 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1953 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1954 * 1955 * Use with {@link #setTextAlignment(int)} 1956 */ 1957 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1958 1959 /** 1960 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1961 * 1962 * Use with {@link #setTextAlignment(int)} 1963 */ 1964 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 1965 1966 /** 1967 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 1968 * 1969 * Use with {@link #setTextAlignment(int)} 1970 */ 1971 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 1972 1973 /** 1974 * Center the paragraph, e.g. ALIGN_CENTER. 1975 * 1976 * Use with {@link #setTextAlignment(int)} 1977 */ 1978 public static final int TEXT_ALIGNMENT_CENTER = 4; 1979 1980 /** 1981 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 1982 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 1983 * 1984 * Use with {@link #setTextAlignment(int)} 1985 */ 1986 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 1987 1988 /** 1989 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 1990 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 1991 * 1992 * Use with {@link #setTextAlignment(int)} 1993 */ 1994 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 1995 1996 /** 1997 * Default text alignment is inherited 1998 */ 1999 protected static int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2000 2001 /** 2002 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2003 * @hide 2004 */ 2005 static final int TEXT_ALIGNMENT_MASK_SHIFT = 13; 2006 2007 /** 2008 * Mask for use with private flags indicating bits used for text alignment. 2009 * @hide 2010 */ 2011 static final int TEXT_ALIGNMENT_MASK = 0x00000007 << TEXT_ALIGNMENT_MASK_SHIFT; 2012 2013 /** 2014 * Array of text direction flags for mapping attribute "textAlignment" to correct 2015 * flag value. 2016 * @hide 2017 */ 2018 private static final int[] TEXT_ALIGNMENT_FLAGS = { 2019 TEXT_ALIGNMENT_INHERIT << TEXT_ALIGNMENT_MASK_SHIFT, 2020 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_MASK_SHIFT, 2021 TEXT_ALIGNMENT_TEXT_START << TEXT_ALIGNMENT_MASK_SHIFT, 2022 TEXT_ALIGNMENT_TEXT_END << TEXT_ALIGNMENT_MASK_SHIFT, 2023 TEXT_ALIGNMENT_CENTER << TEXT_ALIGNMENT_MASK_SHIFT, 2024 TEXT_ALIGNMENT_VIEW_START << TEXT_ALIGNMENT_MASK_SHIFT, 2025 TEXT_ALIGNMENT_VIEW_END << TEXT_ALIGNMENT_MASK_SHIFT 2026 }; 2027 2028 /** 2029 * Indicates whether the view text alignment has been resolved. 2030 * @hide 2031 */ 2032 static final int TEXT_ALIGNMENT_RESOLVED = 0x00000008 << TEXT_ALIGNMENT_MASK_SHIFT; 2033 2034 /** 2035 * Bit shift to get the resolved text alignment. 2036 * @hide 2037 */ 2038 static final int TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2039 2040 /** 2041 * Mask for use with private flags indicating bits used for text alignment. 2042 * @hide 2043 */ 2044 static final int TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2045 2046 /** 2047 * Indicates whether if the view text alignment has been resolved to gravity 2048 */ 2049 public static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2050 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2051 2052 // Accessiblity constants for mPrivateFlags2 2053 2054 /** 2055 * Shift for accessibility related bits in {@link #mPrivateFlags2}. 2056 */ 2057 static final int IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2058 2059 /** 2060 * Automatically determine whether a view is important for accessibility. 2061 */ 2062 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2063 2064 /** 2065 * The view is important for accessibility. 2066 */ 2067 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2068 2069 /** 2070 * The view is not important for accessibility. 2071 */ 2072 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2073 2074 /** 2075 * The default whether the view is important for accessiblity. 2076 */ 2077 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2078 2079 /** 2080 * Mask for obtainig the bits which specify how to determine 2081 * whether a view is important for accessibility. 2082 */ 2083 static final int IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2084 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2085 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2086 2087 /** 2088 * Flag indicating whether a view has accessibility focus. 2089 */ 2090 static final int ACCESSIBILITY_FOCUSED = 0x00000040 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2091 2092 /** 2093 * Flag indicating whether a view state for accessibility has changed. 2094 */ 2095 static final int ACCESSIBILITY_STATE_CHANGED = 0x00000080 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2096 2097 /* End of masks for mPrivateFlags2 */ 2098 2099 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 2100 2101 /** 2102 * Always allow a user to over-scroll this view, provided it is a 2103 * view that can scroll. 2104 * 2105 * @see #getOverScrollMode() 2106 * @see #setOverScrollMode(int) 2107 */ 2108 public static final int OVER_SCROLL_ALWAYS = 0; 2109 2110 /** 2111 * Allow a user to over-scroll this view only if the content is large 2112 * enough to meaningfully scroll, provided it is a view that can scroll. 2113 * 2114 * @see #getOverScrollMode() 2115 * @see #setOverScrollMode(int) 2116 */ 2117 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2118 2119 /** 2120 * Never allow a user to over-scroll this view. 2121 * 2122 * @see #getOverScrollMode() 2123 * @see #setOverScrollMode(int) 2124 */ 2125 public static final int OVER_SCROLL_NEVER = 2; 2126 2127 /** 2128 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2129 * requested the system UI (status bar) to be visible (the default). 2130 * 2131 * @see #setSystemUiVisibility(int) 2132 */ 2133 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2134 2135 /** 2136 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2137 * system UI to enter an unobtrusive "low profile" mode. 2138 * 2139 * <p>This is for use in games, book readers, video players, or any other 2140 * "immersive" application where the usual system chrome is deemed too distracting. 2141 * 2142 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2143 * 2144 * @see #setSystemUiVisibility(int) 2145 */ 2146 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2147 2148 /** 2149 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2150 * system navigation be temporarily hidden. 2151 * 2152 * <p>This is an even less obtrusive state than that called for by 2153 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2154 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2155 * those to disappear. This is useful (in conjunction with the 2156 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2157 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2158 * window flags) for displaying content using every last pixel on the display. 2159 * 2160 * <p>There is a limitation: because navigation controls are so important, the least user 2161 * interaction will cause them to reappear immediately. When this happens, both 2162 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2163 * so that both elements reappear at the same time. 2164 * 2165 * @see #setSystemUiVisibility(int) 2166 */ 2167 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2168 2169 /** 2170 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2171 * into the normal fullscreen mode so that its content can take over the screen 2172 * while still allowing the user to interact with the application. 2173 * 2174 * <p>This has the same visual effect as 2175 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2176 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2177 * meaning that non-critical screen decorations (such as the status bar) will be 2178 * hidden while the user is in the View's window, focusing the experience on 2179 * that content. Unlike the window flag, if you are using ActionBar in 2180 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2181 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2182 * hide the action bar. 2183 * 2184 * <p>This approach to going fullscreen is best used over the window flag when 2185 * it is a transient state -- that is, the application does this at certain 2186 * points in its user interaction where it wants to allow the user to focus 2187 * on content, but not as a continuous state. For situations where the application 2188 * would like to simply stay full screen the entire time (such as a game that 2189 * wants to take over the screen), the 2190 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2191 * is usually a better approach. The state set here will be removed by the system 2192 * in various situations (such as the user moving to another application) like 2193 * the other system UI states. 2194 * 2195 * <p>When using this flag, the application should provide some easy facility 2196 * for the user to go out of it. A common example would be in an e-book 2197 * reader, where tapping on the screen brings back whatever screen and UI 2198 * decorations that had been hidden while the user was immersed in reading 2199 * the book. 2200 * 2201 * @see #setSystemUiVisibility(int) 2202 */ 2203 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2204 2205 /** 2206 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2207 * flags, we would like a stable view of the content insets given to 2208 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2209 * will always represent the worst case that the application can expect 2210 * as a continue state. In practice this means with any of system bar, 2211 * nav bar, and status bar shown, but not the space that would be needed 2212 * for an input method. 2213 * 2214 * <p>If you are using ActionBar in 2215 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2216 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2217 * insets it adds to those given to the application. 2218 */ 2219 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2220 2221 /** 2222 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2223 * to be layed out as if it has requested 2224 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2225 * allows it to avoid artifacts when switching in and out of that mode, at 2226 * the expense that some of its user interface may be covered by screen 2227 * decorations when they are shown. You can perform layout of your inner 2228 * UI elements to account for the navagation system UI through the 2229 * {@link #fitSystemWindows(Rect)} method. 2230 */ 2231 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2232 2233 /** 2234 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2235 * to be layed out as if it has requested 2236 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2237 * allows it to avoid artifacts when switching in and out of that mode, at 2238 * the expense that some of its user interface may be covered by screen 2239 * decorations when they are shown. You can perform layout of your inner 2240 * UI elements to account for non-fullscreen system UI through the 2241 * {@link #fitSystemWindows(Rect)} method. 2242 */ 2243 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2244 2245 /** 2246 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2247 */ 2248 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2249 2250 /** 2251 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2252 */ 2253 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2254 2255 /** 2256 * @hide 2257 * 2258 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2259 * out of the public fields to keep the undefined bits out of the developer's way. 2260 * 2261 * Flag to make the status bar not expandable. Unless you also 2262 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2263 */ 2264 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2265 2266 /** 2267 * @hide 2268 * 2269 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2270 * out of the public fields to keep the undefined bits out of the developer's way. 2271 * 2272 * Flag to hide notification icons and scrolling ticker text. 2273 */ 2274 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2275 2276 /** 2277 * @hide 2278 * 2279 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2280 * out of the public fields to keep the undefined bits out of the developer's way. 2281 * 2282 * Flag to disable incoming notification alerts. This will not block 2283 * icons, but it will block sound, vibrating and other visual or aural notifications. 2284 */ 2285 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2286 2287 /** 2288 * @hide 2289 * 2290 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2291 * out of the public fields to keep the undefined bits out of the developer's way. 2292 * 2293 * Flag to hide only the scrolling ticker. Note that 2294 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2295 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2296 */ 2297 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2298 2299 /** 2300 * @hide 2301 * 2302 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2303 * out of the public fields to keep the undefined bits out of the developer's way. 2304 * 2305 * Flag to hide the center system info area. 2306 */ 2307 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2308 2309 /** 2310 * @hide 2311 * 2312 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2313 * out of the public fields to keep the undefined bits out of the developer's way. 2314 * 2315 * Flag to hide only the home button. Don't use this 2316 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2317 */ 2318 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2319 2320 /** 2321 * @hide 2322 * 2323 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2324 * out of the public fields to keep the undefined bits out of the developer's way. 2325 * 2326 * Flag to hide only the back button. Don't use this 2327 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2328 */ 2329 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2330 2331 /** 2332 * @hide 2333 * 2334 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2335 * out of the public fields to keep the undefined bits out of the developer's way. 2336 * 2337 * Flag to hide only the clock. You might use this if your activity has 2338 * its own clock making the status bar's clock redundant. 2339 */ 2340 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2341 2342 /** 2343 * @hide 2344 * 2345 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2346 * out of the public fields to keep the undefined bits out of the developer's way. 2347 * 2348 * Flag to hide only the recent apps button. Don't use this 2349 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2350 */ 2351 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2352 2353 /** 2354 * @hide 2355 */ 2356 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2357 2358 /** 2359 * These are the system UI flags that can be cleared by events outside 2360 * of an application. Currently this is just the ability to tap on the 2361 * screen while hiding the navigation bar to have it return. 2362 * @hide 2363 */ 2364 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2365 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2366 | SYSTEM_UI_FLAG_FULLSCREEN; 2367 2368 /** 2369 * Flags that can impact the layout in relation to system UI. 2370 */ 2371 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2372 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2373 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2374 2375 /** 2376 * Find views that render the specified text. 2377 * 2378 * @see #findViewsWithText(ArrayList, CharSequence, int) 2379 */ 2380 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2381 2382 /** 2383 * Find find views that contain the specified content description. 2384 * 2385 * @see #findViewsWithText(ArrayList, CharSequence, int) 2386 */ 2387 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2388 2389 /** 2390 * Find views that contain {@link AccessibilityNodeProvider}. Such 2391 * a View is a root of virtual view hierarchy and may contain the searched 2392 * text. If this flag is set Views with providers are automatically 2393 * added and it is a responsibility of the client to call the APIs of 2394 * the provider to determine whether the virtual tree rooted at this View 2395 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2396 * represeting the virtual views with this text. 2397 * 2398 * @see #findViewsWithText(ArrayList, CharSequence, int) 2399 * 2400 * @hide 2401 */ 2402 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2403 2404 /** 2405 * Indicates that the screen has changed state and is now off. 2406 * 2407 * @see #onScreenStateChanged(int) 2408 */ 2409 public static final int SCREEN_STATE_OFF = 0x0; 2410 2411 /** 2412 * Indicates that the screen has changed state and is now on. 2413 * 2414 * @see #onScreenStateChanged(int) 2415 */ 2416 public static final int SCREEN_STATE_ON = 0x1; 2417 2418 /** 2419 * Controls the over-scroll mode for this view. 2420 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2421 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2422 * and {@link #OVER_SCROLL_NEVER}. 2423 */ 2424 private int mOverScrollMode; 2425 2426 /** 2427 * The parent this view is attached to. 2428 * {@hide} 2429 * 2430 * @see #getParent() 2431 */ 2432 protected ViewParent mParent; 2433 2434 /** 2435 * {@hide} 2436 */ 2437 AttachInfo mAttachInfo; 2438 2439 /** 2440 * {@hide} 2441 */ 2442 @ViewDebug.ExportedProperty(flagMapping = { 2443 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2444 name = "FORCE_LAYOUT"), 2445 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2446 name = "LAYOUT_REQUIRED"), 2447 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2448 name = "DRAWING_CACHE_INVALID", outputIf = false), 2449 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2450 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2451 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2452 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2453 }) 2454 int mPrivateFlags; 2455 int mPrivateFlags2; 2456 2457 /** 2458 * This view's request for the visibility of the status bar. 2459 * @hide 2460 */ 2461 @ViewDebug.ExportedProperty(flagMapping = { 2462 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2463 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2464 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2465 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2466 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2467 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2468 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2469 equals = SYSTEM_UI_FLAG_VISIBLE, 2470 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2471 }) 2472 int mSystemUiVisibility; 2473 2474 /** 2475 * Count of how many windows this view has been attached to. 2476 */ 2477 int mWindowAttachCount; 2478 2479 /** 2480 * The layout parameters associated with this view and used by the parent 2481 * {@link android.view.ViewGroup} to determine how this view should be 2482 * laid out. 2483 * {@hide} 2484 */ 2485 protected ViewGroup.LayoutParams mLayoutParams; 2486 2487 /** 2488 * The view flags hold various views states. 2489 * {@hide} 2490 */ 2491 @ViewDebug.ExportedProperty 2492 int mViewFlags; 2493 2494 static class TransformationInfo { 2495 /** 2496 * The transform matrix for the View. This transform is calculated internally 2497 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2498 * is used by default. Do *not* use this variable directly; instead call 2499 * getMatrix(), which will automatically recalculate the matrix if necessary 2500 * to get the correct matrix based on the latest rotation and scale properties. 2501 */ 2502 private final Matrix mMatrix = new Matrix(); 2503 2504 /** 2505 * The transform matrix for the View. This transform is calculated internally 2506 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2507 * is used by default. Do *not* use this variable directly; instead call 2508 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2509 * to get the correct matrix based on the latest rotation and scale properties. 2510 */ 2511 private Matrix mInverseMatrix; 2512 2513 /** 2514 * An internal variable that tracks whether we need to recalculate the 2515 * transform matrix, based on whether the rotation or scaleX/Y properties 2516 * have changed since the matrix was last calculated. 2517 */ 2518 boolean mMatrixDirty = false; 2519 2520 /** 2521 * An internal variable that tracks whether we need to recalculate the 2522 * transform matrix, based on whether the rotation or scaleX/Y properties 2523 * have changed since the matrix was last calculated. 2524 */ 2525 private boolean mInverseMatrixDirty = true; 2526 2527 /** 2528 * A variable that tracks whether we need to recalculate the 2529 * transform matrix, based on whether the rotation or scaleX/Y properties 2530 * have changed since the matrix was last calculated. This variable 2531 * is only valid after a call to updateMatrix() or to a function that 2532 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2533 */ 2534 private boolean mMatrixIsIdentity = true; 2535 2536 /** 2537 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2538 */ 2539 private Camera mCamera = null; 2540 2541 /** 2542 * This matrix is used when computing the matrix for 3D rotations. 2543 */ 2544 private Matrix matrix3D = null; 2545 2546 /** 2547 * These prev values are used to recalculate a centered pivot point when necessary. The 2548 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2549 * set), so thes values are only used then as well. 2550 */ 2551 private int mPrevWidth = -1; 2552 private int mPrevHeight = -1; 2553 2554 /** 2555 * The degrees rotation around the vertical axis through the pivot point. 2556 */ 2557 @ViewDebug.ExportedProperty 2558 float mRotationY = 0f; 2559 2560 /** 2561 * The degrees rotation around the horizontal axis through the pivot point. 2562 */ 2563 @ViewDebug.ExportedProperty 2564 float mRotationX = 0f; 2565 2566 /** 2567 * The degrees rotation around the pivot point. 2568 */ 2569 @ViewDebug.ExportedProperty 2570 float mRotation = 0f; 2571 2572 /** 2573 * The amount of translation of the object away from its left property (post-layout). 2574 */ 2575 @ViewDebug.ExportedProperty 2576 float mTranslationX = 0f; 2577 2578 /** 2579 * The amount of translation of the object away from its top property (post-layout). 2580 */ 2581 @ViewDebug.ExportedProperty 2582 float mTranslationY = 0f; 2583 2584 /** 2585 * The amount of scale in the x direction around the pivot point. A 2586 * value of 1 means no scaling is applied. 2587 */ 2588 @ViewDebug.ExportedProperty 2589 float mScaleX = 1f; 2590 2591 /** 2592 * The amount of scale in the y direction around the pivot point. A 2593 * value of 1 means no scaling is applied. 2594 */ 2595 @ViewDebug.ExportedProperty 2596 float mScaleY = 1f; 2597 2598 /** 2599 * The x location of the point around which the view is rotated and scaled. 2600 */ 2601 @ViewDebug.ExportedProperty 2602 float mPivotX = 0f; 2603 2604 /** 2605 * The y location of the point around which the view is rotated and scaled. 2606 */ 2607 @ViewDebug.ExportedProperty 2608 float mPivotY = 0f; 2609 2610 /** 2611 * The opacity of the View. This is a value from 0 to 1, where 0 means 2612 * completely transparent and 1 means completely opaque. 2613 */ 2614 @ViewDebug.ExportedProperty 2615 float mAlpha = 1f; 2616 } 2617 2618 TransformationInfo mTransformationInfo; 2619 2620 private boolean mLastIsOpaque; 2621 2622 /** 2623 * Convenience value to check for float values that are close enough to zero to be considered 2624 * zero. 2625 */ 2626 private static final float NONZERO_EPSILON = .001f; 2627 2628 /** 2629 * The distance in pixels from the left edge of this view's parent 2630 * to the left edge of this view. 2631 * {@hide} 2632 */ 2633 @ViewDebug.ExportedProperty(category = "layout") 2634 protected int mLeft; 2635 /** 2636 * The distance in pixels from the left edge of this view's parent 2637 * to the right edge of this view. 2638 * {@hide} 2639 */ 2640 @ViewDebug.ExportedProperty(category = "layout") 2641 protected int mRight; 2642 /** 2643 * The distance in pixels from the top edge of this view's parent 2644 * to the top edge of this view. 2645 * {@hide} 2646 */ 2647 @ViewDebug.ExportedProperty(category = "layout") 2648 protected int mTop; 2649 /** 2650 * The distance in pixels from the top edge of this view's parent 2651 * to the bottom edge of this view. 2652 * {@hide} 2653 */ 2654 @ViewDebug.ExportedProperty(category = "layout") 2655 protected int mBottom; 2656 2657 /** 2658 * The offset, in pixels, by which the content of this view is scrolled 2659 * horizontally. 2660 * {@hide} 2661 */ 2662 @ViewDebug.ExportedProperty(category = "scrolling") 2663 protected int mScrollX; 2664 /** 2665 * The offset, in pixels, by which the content of this view is scrolled 2666 * vertically. 2667 * {@hide} 2668 */ 2669 @ViewDebug.ExportedProperty(category = "scrolling") 2670 protected int mScrollY; 2671 2672 /** 2673 * The left padding in pixels, that is the distance in pixels between the 2674 * left edge of this view and the left edge of its content. 2675 * {@hide} 2676 */ 2677 @ViewDebug.ExportedProperty(category = "padding") 2678 protected int mPaddingLeft; 2679 /** 2680 * The right padding in pixels, that is the distance in pixels between the 2681 * right edge of this view and the right edge of its content. 2682 * {@hide} 2683 */ 2684 @ViewDebug.ExportedProperty(category = "padding") 2685 protected int mPaddingRight; 2686 /** 2687 * The top padding in pixels, that is the distance in pixels between the 2688 * top edge of this view and the top edge of its content. 2689 * {@hide} 2690 */ 2691 @ViewDebug.ExportedProperty(category = "padding") 2692 protected int mPaddingTop; 2693 /** 2694 * The bottom padding in pixels, that is the distance in pixels between the 2695 * bottom edge of this view and the bottom edge of its content. 2696 * {@hide} 2697 */ 2698 @ViewDebug.ExportedProperty(category = "padding") 2699 protected int mPaddingBottom; 2700 2701 /** 2702 * The layout insets in pixels, that is the distance in pixels between the 2703 * visible edges of this view its bounds. 2704 */ 2705 private Insets mLayoutInsets; 2706 2707 /** 2708 * Briefly describes the view and is primarily used for accessibility support. 2709 */ 2710 private CharSequence mContentDescription; 2711 2712 /** 2713 * Cache the paddingRight set by the user to append to the scrollbar's size. 2714 * 2715 * @hide 2716 */ 2717 @ViewDebug.ExportedProperty(category = "padding") 2718 protected int mUserPaddingRight; 2719 2720 /** 2721 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2722 * 2723 * @hide 2724 */ 2725 @ViewDebug.ExportedProperty(category = "padding") 2726 protected int mUserPaddingBottom; 2727 2728 /** 2729 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2730 * 2731 * @hide 2732 */ 2733 @ViewDebug.ExportedProperty(category = "padding") 2734 protected int mUserPaddingLeft; 2735 2736 /** 2737 * Cache if the user padding is relative. 2738 * 2739 */ 2740 @ViewDebug.ExportedProperty(category = "padding") 2741 boolean mUserPaddingRelative; 2742 2743 /** 2744 * Cache the paddingStart set by the user to append to the scrollbar's size. 2745 * 2746 */ 2747 @ViewDebug.ExportedProperty(category = "padding") 2748 int mUserPaddingStart; 2749 2750 /** 2751 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2752 * 2753 */ 2754 @ViewDebug.ExportedProperty(category = "padding") 2755 int mUserPaddingEnd; 2756 2757 /** 2758 * @hide 2759 */ 2760 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2761 /** 2762 * @hide 2763 */ 2764 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2765 2766 private Drawable mBackground; 2767 2768 private int mBackgroundResource; 2769 private boolean mBackgroundSizeChanged; 2770 2771 static class ListenerInfo { 2772 /** 2773 * Listener used to dispatch focus change events. 2774 * This field should be made private, so it is hidden from the SDK. 2775 * {@hide} 2776 */ 2777 protected OnFocusChangeListener mOnFocusChangeListener; 2778 2779 /** 2780 * Listeners for layout change events. 2781 */ 2782 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2783 2784 /** 2785 * Listeners for attach events. 2786 */ 2787 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2788 2789 /** 2790 * Listener used to dispatch click events. 2791 * This field should be made private, so it is hidden from the SDK. 2792 * {@hide} 2793 */ 2794 public OnClickListener mOnClickListener; 2795 2796 /** 2797 * Listener used to dispatch long click events. 2798 * This field should be made private, so it is hidden from the SDK. 2799 * {@hide} 2800 */ 2801 protected OnLongClickListener mOnLongClickListener; 2802 2803 /** 2804 * Listener used to build the context menu. 2805 * This field should be made private, so it is hidden from the SDK. 2806 * {@hide} 2807 */ 2808 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2809 2810 private OnKeyListener mOnKeyListener; 2811 2812 private OnTouchListener mOnTouchListener; 2813 2814 private OnHoverListener mOnHoverListener; 2815 2816 private OnGenericMotionListener mOnGenericMotionListener; 2817 2818 private OnDragListener mOnDragListener; 2819 2820 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2821 } 2822 2823 ListenerInfo mListenerInfo; 2824 2825 /** 2826 * The application environment this view lives in. 2827 * This field should be made private, so it is hidden from the SDK. 2828 * {@hide} 2829 */ 2830 protected Context mContext; 2831 2832 private final Resources mResources; 2833 2834 private ScrollabilityCache mScrollCache; 2835 2836 private int[] mDrawableState = null; 2837 2838 /** 2839 * Set to true when drawing cache is enabled and cannot be created. 2840 * 2841 * @hide 2842 */ 2843 public boolean mCachingFailed; 2844 2845 private Bitmap mDrawingCache; 2846 private Bitmap mUnscaledDrawingCache; 2847 private HardwareLayer mHardwareLayer; 2848 DisplayList mDisplayList; 2849 2850 /** 2851 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2852 * the user may specify which view to go to next. 2853 */ 2854 private int mNextFocusLeftId = View.NO_ID; 2855 2856 /** 2857 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2858 * the user may specify which view to go to next. 2859 */ 2860 private int mNextFocusRightId = View.NO_ID; 2861 2862 /** 2863 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2864 * the user may specify which view to go to next. 2865 */ 2866 private int mNextFocusUpId = View.NO_ID; 2867 2868 /** 2869 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2870 * the user may specify which view to go to next. 2871 */ 2872 private int mNextFocusDownId = View.NO_ID; 2873 2874 /** 2875 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2876 * the user may specify which view to go to next. 2877 */ 2878 int mNextFocusForwardId = View.NO_ID; 2879 2880 private CheckForLongPress mPendingCheckForLongPress; 2881 private CheckForTap mPendingCheckForTap = null; 2882 private PerformClick mPerformClick; 2883 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2884 2885 private UnsetPressedState mUnsetPressedState; 2886 2887 /** 2888 * Whether the long press's action has been invoked. The tap's action is invoked on the 2889 * up event while a long press is invoked as soon as the long press duration is reached, so 2890 * a long press could be performed before the tap is checked, in which case the tap's action 2891 * should not be invoked. 2892 */ 2893 private boolean mHasPerformedLongPress; 2894 2895 /** 2896 * The minimum height of the view. We'll try our best to have the height 2897 * of this view to at least this amount. 2898 */ 2899 @ViewDebug.ExportedProperty(category = "measurement") 2900 private int mMinHeight; 2901 2902 /** 2903 * The minimum width of the view. We'll try our best to have the width 2904 * of this view to at least this amount. 2905 */ 2906 @ViewDebug.ExportedProperty(category = "measurement") 2907 private int mMinWidth; 2908 2909 /** 2910 * The delegate to handle touch events that are physically in this view 2911 * but should be handled by another view. 2912 */ 2913 private TouchDelegate mTouchDelegate = null; 2914 2915 /** 2916 * Solid color to use as a background when creating the drawing cache. Enables 2917 * the cache to use 16 bit bitmaps instead of 32 bit. 2918 */ 2919 private int mDrawingCacheBackgroundColor = 0; 2920 2921 /** 2922 * Special tree observer used when mAttachInfo is null. 2923 */ 2924 private ViewTreeObserver mFloatingTreeObserver; 2925 2926 /** 2927 * Cache the touch slop from the context that created the view. 2928 */ 2929 private int mTouchSlop; 2930 2931 /** 2932 * Object that handles automatic animation of view properties. 2933 */ 2934 private ViewPropertyAnimator mAnimator = null; 2935 2936 /** 2937 * Flag indicating that a drag can cross window boundaries. When 2938 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2939 * with this flag set, all visible applications will be able to participate 2940 * in the drag operation and receive the dragged content. 2941 * 2942 * @hide 2943 */ 2944 public static final int DRAG_FLAG_GLOBAL = 1; 2945 2946 /** 2947 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2948 */ 2949 private float mVerticalScrollFactor; 2950 2951 /** 2952 * Position of the vertical scroll bar. 2953 */ 2954 private int mVerticalScrollbarPosition; 2955 2956 /** 2957 * Position the scroll bar at the default position as determined by the system. 2958 */ 2959 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2960 2961 /** 2962 * Position the scroll bar along the left edge. 2963 */ 2964 public static final int SCROLLBAR_POSITION_LEFT = 1; 2965 2966 /** 2967 * Position the scroll bar along the right edge. 2968 */ 2969 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2970 2971 /** 2972 * Indicates that the view does not have a layer. 2973 * 2974 * @see #getLayerType() 2975 * @see #setLayerType(int, android.graphics.Paint) 2976 * @see #LAYER_TYPE_SOFTWARE 2977 * @see #LAYER_TYPE_HARDWARE 2978 */ 2979 public static final int LAYER_TYPE_NONE = 0; 2980 2981 /** 2982 * <p>Indicates that the view has a software layer. A software layer is backed 2983 * by a bitmap and causes the view to be rendered using Android's software 2984 * rendering pipeline, even if hardware acceleration is enabled.</p> 2985 * 2986 * <p>Software layers have various usages:</p> 2987 * <p>When the application is not using hardware acceleration, a software layer 2988 * is useful to apply a specific color filter and/or blending mode and/or 2989 * translucency to a view and all its children.</p> 2990 * <p>When the application is using hardware acceleration, a software layer 2991 * is useful to render drawing primitives not supported by the hardware 2992 * accelerated pipeline. It can also be used to cache a complex view tree 2993 * into a texture and reduce the complexity of drawing operations. For instance, 2994 * when animating a complex view tree with a translation, a software layer can 2995 * be used to render the view tree only once.</p> 2996 * <p>Software layers should be avoided when the affected view tree updates 2997 * often. Every update will require to re-render the software layer, which can 2998 * potentially be slow (particularly when hardware acceleration is turned on 2999 * since the layer will have to be uploaded into a hardware texture after every 3000 * update.)</p> 3001 * 3002 * @see #getLayerType() 3003 * @see #setLayerType(int, android.graphics.Paint) 3004 * @see #LAYER_TYPE_NONE 3005 * @see #LAYER_TYPE_HARDWARE 3006 */ 3007 public static final int LAYER_TYPE_SOFTWARE = 1; 3008 3009 /** 3010 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3011 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3012 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3013 * rendering pipeline, but only if hardware acceleration is turned on for the 3014 * view hierarchy. When hardware acceleration is turned off, hardware layers 3015 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3016 * 3017 * <p>A hardware layer is useful to apply a specific color filter and/or 3018 * blending mode and/or translucency to a view and all its children.</p> 3019 * <p>A hardware layer can be used to cache a complex view tree into a 3020 * texture and reduce the complexity of drawing operations. For instance, 3021 * when animating a complex view tree with a translation, a hardware layer can 3022 * be used to render the view tree only once.</p> 3023 * <p>A hardware layer can also be used to increase the rendering quality when 3024 * rotation transformations are applied on a view. It can also be used to 3025 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3026 * 3027 * @see #getLayerType() 3028 * @see #setLayerType(int, android.graphics.Paint) 3029 * @see #LAYER_TYPE_NONE 3030 * @see #LAYER_TYPE_SOFTWARE 3031 */ 3032 public static final int LAYER_TYPE_HARDWARE = 2; 3033 3034 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3035 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3036 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3037 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3038 }) 3039 int mLayerType = LAYER_TYPE_NONE; 3040 Paint mLayerPaint; 3041 Rect mLocalDirtyRect; 3042 3043 /** 3044 * Set to true when the view is sending hover accessibility events because it 3045 * is the innermost hovered view. 3046 */ 3047 private boolean mSendingHoverAccessibilityEvents; 3048 3049 /** 3050 * Simple constructor to use when creating a view from code. 3051 * 3052 * @param context The Context the view is running in, through which it can 3053 * access the current theme, resources, etc. 3054 */ 3055 public View(Context context) { 3056 mContext = context; 3057 mResources = context != null ? context.getResources() : null; 3058 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3059 // Set layout and text direction defaults 3060 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3061 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3062 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3063 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3064 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3065 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3066 mUserPaddingStart = -1; 3067 mUserPaddingEnd = -1; 3068 mUserPaddingRelative = false; 3069 } 3070 3071 /** 3072 * Delegate for injecting accessiblity functionality. 3073 */ 3074 AccessibilityDelegate mAccessibilityDelegate; 3075 3076 /** 3077 * Consistency verifier for debugging purposes. 3078 * @hide 3079 */ 3080 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3081 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3082 new InputEventConsistencyVerifier(this, 0) : null; 3083 3084 /** 3085 * Constructor that is called when inflating a view from XML. This is called 3086 * when a view is being constructed from an XML file, supplying attributes 3087 * that were specified in the XML file. This version uses a default style of 3088 * 0, so the only attribute values applied are those in the Context's Theme 3089 * and the given AttributeSet. 3090 * 3091 * <p> 3092 * The method onFinishInflate() will be called after all children have been 3093 * added. 3094 * 3095 * @param context The Context the view is running in, through which it can 3096 * access the current theme, resources, etc. 3097 * @param attrs The attributes of the XML tag that is inflating the view. 3098 * @see #View(Context, AttributeSet, int) 3099 */ 3100 public View(Context context, AttributeSet attrs) { 3101 this(context, attrs, 0); 3102 } 3103 3104 /** 3105 * Perform inflation from XML and apply a class-specific base style. This 3106 * constructor of View allows subclasses to use their own base style when 3107 * they are inflating. For example, a Button class's constructor would call 3108 * this version of the super class constructor and supply 3109 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3110 * the theme's button style to modify all of the base view attributes (in 3111 * particular its background) as well as the Button class's attributes. 3112 * 3113 * @param context The Context the view is running in, through which it can 3114 * access the current theme, resources, etc. 3115 * @param attrs The attributes of the XML tag that is inflating the view. 3116 * @param defStyle The default style to apply to this view. If 0, no style 3117 * will be applied (beyond what is included in the theme). This may 3118 * either be an attribute resource, whose value will be retrieved 3119 * from the current theme, or an explicit style resource. 3120 * @see #View(Context, AttributeSet) 3121 */ 3122 public View(Context context, AttributeSet attrs, int defStyle) { 3123 this(context); 3124 3125 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3126 defStyle, 0); 3127 3128 Drawable background = null; 3129 3130 int leftPadding = -1; 3131 int topPadding = -1; 3132 int rightPadding = -1; 3133 int bottomPadding = -1; 3134 int startPadding = -1; 3135 int endPadding = -1; 3136 3137 int padding = -1; 3138 3139 int viewFlagValues = 0; 3140 int viewFlagMasks = 0; 3141 3142 boolean setScrollContainer = false; 3143 3144 int x = 0; 3145 int y = 0; 3146 3147 float tx = 0; 3148 float ty = 0; 3149 float rotation = 0; 3150 float rotationX = 0; 3151 float rotationY = 0; 3152 float sx = 1f; 3153 float sy = 1f; 3154 boolean transformSet = false; 3155 3156 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3157 3158 int overScrollMode = mOverScrollMode; 3159 final int N = a.getIndexCount(); 3160 for (int i = 0; i < N; i++) { 3161 int attr = a.getIndex(i); 3162 switch (attr) { 3163 case com.android.internal.R.styleable.View_background: 3164 background = a.getDrawable(attr); 3165 break; 3166 case com.android.internal.R.styleable.View_padding: 3167 padding = a.getDimensionPixelSize(attr, -1); 3168 break; 3169 case com.android.internal.R.styleable.View_paddingLeft: 3170 leftPadding = a.getDimensionPixelSize(attr, -1); 3171 break; 3172 case com.android.internal.R.styleable.View_paddingTop: 3173 topPadding = a.getDimensionPixelSize(attr, -1); 3174 break; 3175 case com.android.internal.R.styleable.View_paddingRight: 3176 rightPadding = a.getDimensionPixelSize(attr, -1); 3177 break; 3178 case com.android.internal.R.styleable.View_paddingBottom: 3179 bottomPadding = a.getDimensionPixelSize(attr, -1); 3180 break; 3181 case com.android.internal.R.styleable.View_paddingStart: 3182 startPadding = a.getDimensionPixelSize(attr, -1); 3183 break; 3184 case com.android.internal.R.styleable.View_paddingEnd: 3185 endPadding = a.getDimensionPixelSize(attr, -1); 3186 break; 3187 case com.android.internal.R.styleable.View_scrollX: 3188 x = a.getDimensionPixelOffset(attr, 0); 3189 break; 3190 case com.android.internal.R.styleable.View_scrollY: 3191 y = a.getDimensionPixelOffset(attr, 0); 3192 break; 3193 case com.android.internal.R.styleable.View_alpha: 3194 setAlpha(a.getFloat(attr, 1f)); 3195 break; 3196 case com.android.internal.R.styleable.View_transformPivotX: 3197 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3198 break; 3199 case com.android.internal.R.styleable.View_transformPivotY: 3200 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3201 break; 3202 case com.android.internal.R.styleable.View_translationX: 3203 tx = a.getDimensionPixelOffset(attr, 0); 3204 transformSet = true; 3205 break; 3206 case com.android.internal.R.styleable.View_translationY: 3207 ty = a.getDimensionPixelOffset(attr, 0); 3208 transformSet = true; 3209 break; 3210 case com.android.internal.R.styleable.View_rotation: 3211 rotation = a.getFloat(attr, 0); 3212 transformSet = true; 3213 break; 3214 case com.android.internal.R.styleable.View_rotationX: 3215 rotationX = a.getFloat(attr, 0); 3216 transformSet = true; 3217 break; 3218 case com.android.internal.R.styleable.View_rotationY: 3219 rotationY = a.getFloat(attr, 0); 3220 transformSet = true; 3221 break; 3222 case com.android.internal.R.styleable.View_scaleX: 3223 sx = a.getFloat(attr, 1f); 3224 transformSet = true; 3225 break; 3226 case com.android.internal.R.styleable.View_scaleY: 3227 sy = a.getFloat(attr, 1f); 3228 transformSet = true; 3229 break; 3230 case com.android.internal.R.styleable.View_id: 3231 mID = a.getResourceId(attr, NO_ID); 3232 break; 3233 case com.android.internal.R.styleable.View_tag: 3234 mTag = a.getText(attr); 3235 break; 3236 case com.android.internal.R.styleable.View_fitsSystemWindows: 3237 if (a.getBoolean(attr, false)) { 3238 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3239 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3240 } 3241 break; 3242 case com.android.internal.R.styleable.View_focusable: 3243 if (a.getBoolean(attr, false)) { 3244 viewFlagValues |= FOCUSABLE; 3245 viewFlagMasks |= FOCUSABLE_MASK; 3246 } 3247 break; 3248 case com.android.internal.R.styleable.View_focusableInTouchMode: 3249 if (a.getBoolean(attr, false)) { 3250 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3251 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3252 } 3253 break; 3254 case com.android.internal.R.styleable.View_clickable: 3255 if (a.getBoolean(attr, false)) { 3256 viewFlagValues |= CLICKABLE; 3257 viewFlagMasks |= CLICKABLE; 3258 } 3259 break; 3260 case com.android.internal.R.styleable.View_longClickable: 3261 if (a.getBoolean(attr, false)) { 3262 viewFlagValues |= LONG_CLICKABLE; 3263 viewFlagMasks |= LONG_CLICKABLE; 3264 } 3265 break; 3266 case com.android.internal.R.styleable.View_saveEnabled: 3267 if (!a.getBoolean(attr, true)) { 3268 viewFlagValues |= SAVE_DISABLED; 3269 viewFlagMasks |= SAVE_DISABLED_MASK; 3270 } 3271 break; 3272 case com.android.internal.R.styleable.View_duplicateParentState: 3273 if (a.getBoolean(attr, false)) { 3274 viewFlagValues |= DUPLICATE_PARENT_STATE; 3275 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3276 } 3277 break; 3278 case com.android.internal.R.styleable.View_visibility: 3279 final int visibility = a.getInt(attr, 0); 3280 if (visibility != 0) { 3281 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3282 viewFlagMasks |= VISIBILITY_MASK; 3283 } 3284 break; 3285 case com.android.internal.R.styleable.View_layoutDirection: 3286 // Clear any layout direction flags (included resolved bits) already set 3287 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3288 // Set the layout direction flags depending on the value of the attribute 3289 final int layoutDirection = a.getInt(attr, -1); 3290 final int value = (layoutDirection != -1) ? 3291 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3292 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3293 break; 3294 case com.android.internal.R.styleable.View_drawingCacheQuality: 3295 final int cacheQuality = a.getInt(attr, 0); 3296 if (cacheQuality != 0) { 3297 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3298 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3299 } 3300 break; 3301 case com.android.internal.R.styleable.View_contentDescription: 3302 mContentDescription = a.getString(attr); 3303 break; 3304 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3305 if (!a.getBoolean(attr, true)) { 3306 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3307 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3308 } 3309 break; 3310 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3311 if (!a.getBoolean(attr, true)) { 3312 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3313 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3314 } 3315 break; 3316 case R.styleable.View_scrollbars: 3317 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3318 if (scrollbars != SCROLLBARS_NONE) { 3319 viewFlagValues |= scrollbars; 3320 viewFlagMasks |= SCROLLBARS_MASK; 3321 initializeScrollbars(a); 3322 } 3323 break; 3324 //noinspection deprecation 3325 case R.styleable.View_fadingEdge: 3326 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3327 // Ignore the attribute starting with ICS 3328 break; 3329 } 3330 // With builds < ICS, fall through and apply fading edges 3331 case R.styleable.View_requiresFadingEdge: 3332 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3333 if (fadingEdge != FADING_EDGE_NONE) { 3334 viewFlagValues |= fadingEdge; 3335 viewFlagMasks |= FADING_EDGE_MASK; 3336 initializeFadingEdge(a); 3337 } 3338 break; 3339 case R.styleable.View_scrollbarStyle: 3340 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3341 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3342 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3343 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3344 } 3345 break; 3346 case R.styleable.View_isScrollContainer: 3347 setScrollContainer = true; 3348 if (a.getBoolean(attr, false)) { 3349 setScrollContainer(true); 3350 } 3351 break; 3352 case com.android.internal.R.styleable.View_keepScreenOn: 3353 if (a.getBoolean(attr, false)) { 3354 viewFlagValues |= KEEP_SCREEN_ON; 3355 viewFlagMasks |= KEEP_SCREEN_ON; 3356 } 3357 break; 3358 case R.styleable.View_filterTouchesWhenObscured: 3359 if (a.getBoolean(attr, false)) { 3360 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3361 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3362 } 3363 break; 3364 case R.styleable.View_nextFocusLeft: 3365 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3366 break; 3367 case R.styleable.View_nextFocusRight: 3368 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3369 break; 3370 case R.styleable.View_nextFocusUp: 3371 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3372 break; 3373 case R.styleable.View_nextFocusDown: 3374 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3375 break; 3376 case R.styleable.View_nextFocusForward: 3377 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3378 break; 3379 case R.styleable.View_minWidth: 3380 mMinWidth = a.getDimensionPixelSize(attr, 0); 3381 break; 3382 case R.styleable.View_minHeight: 3383 mMinHeight = a.getDimensionPixelSize(attr, 0); 3384 break; 3385 case R.styleable.View_onClick: 3386 if (context.isRestricted()) { 3387 throw new IllegalStateException("The android:onClick attribute cannot " 3388 + "be used within a restricted context"); 3389 } 3390 3391 final String handlerName = a.getString(attr); 3392 if (handlerName != null) { 3393 setOnClickListener(new OnClickListener() { 3394 private Method mHandler; 3395 3396 public void onClick(View v) { 3397 if (mHandler == null) { 3398 try { 3399 mHandler = getContext().getClass().getMethod(handlerName, 3400 View.class); 3401 } catch (NoSuchMethodException e) { 3402 int id = getId(); 3403 String idText = id == NO_ID ? "" : " with id '" 3404 + getContext().getResources().getResourceEntryName( 3405 id) + "'"; 3406 throw new IllegalStateException("Could not find a method " + 3407 handlerName + "(View) in the activity " 3408 + getContext().getClass() + " for onClick handler" 3409 + " on view " + View.this.getClass() + idText, e); 3410 } 3411 } 3412 3413 try { 3414 mHandler.invoke(getContext(), View.this); 3415 } catch (IllegalAccessException e) { 3416 throw new IllegalStateException("Could not execute non " 3417 + "public method of the activity", e); 3418 } catch (InvocationTargetException e) { 3419 throw new IllegalStateException("Could not execute " 3420 + "method of the activity", e); 3421 } 3422 } 3423 }); 3424 } 3425 break; 3426 case R.styleable.View_overScrollMode: 3427 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3428 break; 3429 case R.styleable.View_verticalScrollbarPosition: 3430 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3431 break; 3432 case R.styleable.View_layerType: 3433 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3434 break; 3435 case R.styleable.View_textDirection: 3436 // Clear any text direction flag already set 3437 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3438 // Set the text direction flags depending on the value of the attribute 3439 final int textDirection = a.getInt(attr, -1); 3440 if (textDirection != -1) { 3441 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3442 } 3443 break; 3444 case R.styleable.View_textAlignment: 3445 // Clear any text alignment flag already set 3446 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3447 // Set the text alignment flag depending on the value of the attribute 3448 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3449 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3450 break; 3451 case R.styleable.View_importantForAccessibility: 3452 setImportantForAccessibility(a.getInt(attr, 3453 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3454 } 3455 } 3456 3457 a.recycle(); 3458 3459 setOverScrollMode(overScrollMode); 3460 3461 if (background != null) { 3462 setBackground(background); 3463 } 3464 3465 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3466 // layout direction). Those cached values will be used later during padding resolution. 3467 mUserPaddingStart = startPadding; 3468 mUserPaddingEnd = endPadding; 3469 3470 updateUserPaddingRelative(); 3471 3472 if (padding >= 0) { 3473 leftPadding = padding; 3474 topPadding = padding; 3475 rightPadding = padding; 3476 bottomPadding = padding; 3477 } 3478 3479 // If the user specified the padding (either with android:padding or 3480 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3481 // use the default padding or the padding from the background drawable 3482 // (stored at this point in mPadding*) 3483 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3484 topPadding >= 0 ? topPadding : mPaddingTop, 3485 rightPadding >= 0 ? rightPadding : mPaddingRight, 3486 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3487 3488 if (viewFlagMasks != 0) { 3489 setFlags(viewFlagValues, viewFlagMasks); 3490 } 3491 3492 // Needs to be called after mViewFlags is set 3493 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3494 recomputePadding(); 3495 } 3496 3497 if (x != 0 || y != 0) { 3498 scrollTo(x, y); 3499 } 3500 3501 if (transformSet) { 3502 setTranslationX(tx); 3503 setTranslationY(ty); 3504 setRotation(rotation); 3505 setRotationX(rotationX); 3506 setRotationY(rotationY); 3507 setScaleX(sx); 3508 setScaleY(sy); 3509 } 3510 3511 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3512 setScrollContainer(true); 3513 } 3514 3515 computeOpaqueFlags(); 3516 } 3517 3518 private void updateUserPaddingRelative() { 3519 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3520 } 3521 3522 /** 3523 * Non-public constructor for use in testing 3524 */ 3525 View() { 3526 mResources = null; 3527 } 3528 3529 /** 3530 * <p> 3531 * Initializes the fading edges from a given set of styled attributes. This 3532 * method should be called by subclasses that need fading edges and when an 3533 * instance of these subclasses is created programmatically rather than 3534 * being inflated from XML. This method is automatically called when the XML 3535 * is inflated. 3536 * </p> 3537 * 3538 * @param a the styled attributes set to initialize the fading edges from 3539 */ 3540 protected void initializeFadingEdge(TypedArray a) { 3541 initScrollCache(); 3542 3543 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3544 R.styleable.View_fadingEdgeLength, 3545 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3546 } 3547 3548 /** 3549 * Returns the size of the vertical faded edges used to indicate that more 3550 * content in this view is visible. 3551 * 3552 * @return The size in pixels of the vertical faded edge or 0 if vertical 3553 * faded edges are not enabled for this view. 3554 * @attr ref android.R.styleable#View_fadingEdgeLength 3555 */ 3556 public int getVerticalFadingEdgeLength() { 3557 if (isVerticalFadingEdgeEnabled()) { 3558 ScrollabilityCache cache = mScrollCache; 3559 if (cache != null) { 3560 return cache.fadingEdgeLength; 3561 } 3562 } 3563 return 0; 3564 } 3565 3566 /** 3567 * Set the size of the faded edge used to indicate that more content in this 3568 * view is available. Will not change whether the fading edge is enabled; use 3569 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3570 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3571 * for the vertical or horizontal fading edges. 3572 * 3573 * @param length The size in pixels of the faded edge used to indicate that more 3574 * content in this view is visible. 3575 */ 3576 public void setFadingEdgeLength(int length) { 3577 initScrollCache(); 3578 mScrollCache.fadingEdgeLength = length; 3579 } 3580 3581 /** 3582 * Returns the size of the horizontal faded edges used to indicate that more 3583 * content in this view is visible. 3584 * 3585 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3586 * faded edges are not enabled for this view. 3587 * @attr ref android.R.styleable#View_fadingEdgeLength 3588 */ 3589 public int getHorizontalFadingEdgeLength() { 3590 if (isHorizontalFadingEdgeEnabled()) { 3591 ScrollabilityCache cache = mScrollCache; 3592 if (cache != null) { 3593 return cache.fadingEdgeLength; 3594 } 3595 } 3596 return 0; 3597 } 3598 3599 /** 3600 * Returns the width of the vertical scrollbar. 3601 * 3602 * @return The width in pixels of the vertical scrollbar or 0 if there 3603 * is no vertical scrollbar. 3604 */ 3605 public int getVerticalScrollbarWidth() { 3606 ScrollabilityCache cache = mScrollCache; 3607 if (cache != null) { 3608 ScrollBarDrawable scrollBar = cache.scrollBar; 3609 if (scrollBar != null) { 3610 int size = scrollBar.getSize(true); 3611 if (size <= 0) { 3612 size = cache.scrollBarSize; 3613 } 3614 return size; 3615 } 3616 return 0; 3617 } 3618 return 0; 3619 } 3620 3621 /** 3622 * Returns the height of the horizontal scrollbar. 3623 * 3624 * @return The height in pixels of the horizontal scrollbar or 0 if 3625 * there is no horizontal scrollbar. 3626 */ 3627 protected int getHorizontalScrollbarHeight() { 3628 ScrollabilityCache cache = mScrollCache; 3629 if (cache != null) { 3630 ScrollBarDrawable scrollBar = cache.scrollBar; 3631 if (scrollBar != null) { 3632 int size = scrollBar.getSize(false); 3633 if (size <= 0) { 3634 size = cache.scrollBarSize; 3635 } 3636 return size; 3637 } 3638 return 0; 3639 } 3640 return 0; 3641 } 3642 3643 /** 3644 * <p> 3645 * Initializes the scrollbars from a given set of styled attributes. This 3646 * method should be called by subclasses that need scrollbars and when an 3647 * instance of these subclasses is created programmatically rather than 3648 * being inflated from XML. This method is automatically called when the XML 3649 * is inflated. 3650 * </p> 3651 * 3652 * @param a the styled attributes set to initialize the scrollbars from 3653 */ 3654 protected void initializeScrollbars(TypedArray a) { 3655 initScrollCache(); 3656 3657 final ScrollabilityCache scrollabilityCache = mScrollCache; 3658 3659 if (scrollabilityCache.scrollBar == null) { 3660 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3661 } 3662 3663 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3664 3665 if (!fadeScrollbars) { 3666 scrollabilityCache.state = ScrollabilityCache.ON; 3667 } 3668 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3669 3670 3671 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3672 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3673 .getScrollBarFadeDuration()); 3674 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3675 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3676 ViewConfiguration.getScrollDefaultDelay()); 3677 3678 3679 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3680 com.android.internal.R.styleable.View_scrollbarSize, 3681 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3682 3683 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3684 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3685 3686 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3687 if (thumb != null) { 3688 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3689 } 3690 3691 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3692 false); 3693 if (alwaysDraw) { 3694 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3695 } 3696 3697 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3698 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3699 3700 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3701 if (thumb != null) { 3702 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3703 } 3704 3705 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3706 false); 3707 if (alwaysDraw) { 3708 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3709 } 3710 3711 // Re-apply user/background padding so that scrollbar(s) get added 3712 resolvePadding(); 3713 } 3714 3715 /** 3716 * <p> 3717 * Initalizes the scrollability cache if necessary. 3718 * </p> 3719 */ 3720 private void initScrollCache() { 3721 if (mScrollCache == null) { 3722 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3723 } 3724 } 3725 3726 private ScrollabilityCache getScrollCache() { 3727 initScrollCache(); 3728 return mScrollCache; 3729 } 3730 3731 /** 3732 * Set the position of the vertical scroll bar. Should be one of 3733 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3734 * {@link #SCROLLBAR_POSITION_RIGHT}. 3735 * 3736 * @param position Where the vertical scroll bar should be positioned. 3737 */ 3738 public void setVerticalScrollbarPosition(int position) { 3739 if (mVerticalScrollbarPosition != position) { 3740 mVerticalScrollbarPosition = position; 3741 computeOpaqueFlags(); 3742 resolvePadding(); 3743 } 3744 } 3745 3746 /** 3747 * @return The position where the vertical scroll bar will show, if applicable. 3748 * @see #setVerticalScrollbarPosition(int) 3749 */ 3750 public int getVerticalScrollbarPosition() { 3751 return mVerticalScrollbarPosition; 3752 } 3753 3754 ListenerInfo getListenerInfo() { 3755 if (mListenerInfo != null) { 3756 return mListenerInfo; 3757 } 3758 mListenerInfo = new ListenerInfo(); 3759 return mListenerInfo; 3760 } 3761 3762 /** 3763 * Register a callback to be invoked when focus of this view changed. 3764 * 3765 * @param l The callback that will run. 3766 */ 3767 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3768 getListenerInfo().mOnFocusChangeListener = l; 3769 } 3770 3771 /** 3772 * Add a listener that will be called when the bounds of the view change due to 3773 * layout processing. 3774 * 3775 * @param listener The listener that will be called when layout bounds change. 3776 */ 3777 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3778 ListenerInfo li = getListenerInfo(); 3779 if (li.mOnLayoutChangeListeners == null) { 3780 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3781 } 3782 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3783 li.mOnLayoutChangeListeners.add(listener); 3784 } 3785 } 3786 3787 /** 3788 * Remove a listener for layout changes. 3789 * 3790 * @param listener The listener for layout bounds change. 3791 */ 3792 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3793 ListenerInfo li = mListenerInfo; 3794 if (li == null || li.mOnLayoutChangeListeners == null) { 3795 return; 3796 } 3797 li.mOnLayoutChangeListeners.remove(listener); 3798 } 3799 3800 /** 3801 * Add a listener for attach state changes. 3802 * 3803 * This listener will be called whenever this view is attached or detached 3804 * from a window. Remove the listener using 3805 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3806 * 3807 * @param listener Listener to attach 3808 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3809 */ 3810 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3811 ListenerInfo li = getListenerInfo(); 3812 if (li.mOnAttachStateChangeListeners == null) { 3813 li.mOnAttachStateChangeListeners 3814 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3815 } 3816 li.mOnAttachStateChangeListeners.add(listener); 3817 } 3818 3819 /** 3820 * Remove a listener for attach state changes. The listener will receive no further 3821 * notification of window attach/detach events. 3822 * 3823 * @param listener Listener to remove 3824 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3825 */ 3826 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3827 ListenerInfo li = mListenerInfo; 3828 if (li == null || li.mOnAttachStateChangeListeners == null) { 3829 return; 3830 } 3831 li.mOnAttachStateChangeListeners.remove(listener); 3832 } 3833 3834 /** 3835 * Returns the focus-change callback registered for this view. 3836 * 3837 * @return The callback, or null if one is not registered. 3838 */ 3839 public OnFocusChangeListener getOnFocusChangeListener() { 3840 ListenerInfo li = mListenerInfo; 3841 return li != null ? li.mOnFocusChangeListener : null; 3842 } 3843 3844 /** 3845 * Register a callback to be invoked when this view is clicked. If this view is not 3846 * clickable, it becomes clickable. 3847 * 3848 * @param l The callback that will run 3849 * 3850 * @see #setClickable(boolean) 3851 */ 3852 public void setOnClickListener(OnClickListener l) { 3853 if (!isClickable()) { 3854 setClickable(true); 3855 } 3856 getListenerInfo().mOnClickListener = l; 3857 } 3858 3859 /** 3860 * Return whether this view has an attached OnClickListener. Returns 3861 * true if there is a listener, false if there is none. 3862 */ 3863 public boolean hasOnClickListeners() { 3864 ListenerInfo li = mListenerInfo; 3865 return (li != null && li.mOnClickListener != null); 3866 } 3867 3868 /** 3869 * Register a callback to be invoked when this view is clicked and held. If this view is not 3870 * long clickable, it becomes long clickable. 3871 * 3872 * @param l The callback that will run 3873 * 3874 * @see #setLongClickable(boolean) 3875 */ 3876 public void setOnLongClickListener(OnLongClickListener l) { 3877 if (!isLongClickable()) { 3878 setLongClickable(true); 3879 } 3880 getListenerInfo().mOnLongClickListener = l; 3881 } 3882 3883 /** 3884 * Register a callback to be invoked when the context menu for this view is 3885 * being built. If this view is not long clickable, it becomes long clickable. 3886 * 3887 * @param l The callback that will run 3888 * 3889 */ 3890 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3891 if (!isLongClickable()) { 3892 setLongClickable(true); 3893 } 3894 getListenerInfo().mOnCreateContextMenuListener = l; 3895 } 3896 3897 /** 3898 * Call this view's OnClickListener, if it is defined. Performs all normal 3899 * actions associated with clicking: reporting accessibility event, playing 3900 * a sound, etc. 3901 * 3902 * @return True there was an assigned OnClickListener that was called, false 3903 * otherwise is returned. 3904 */ 3905 public boolean performClick() { 3906 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3907 3908 ListenerInfo li = mListenerInfo; 3909 if (li != null && li.mOnClickListener != null) { 3910 playSoundEffect(SoundEffectConstants.CLICK); 3911 li.mOnClickListener.onClick(this); 3912 return true; 3913 } 3914 3915 return false; 3916 } 3917 3918 /** 3919 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3920 * this only calls the listener, and does not do any associated clicking 3921 * actions like reporting an accessibility event. 3922 * 3923 * @return True there was an assigned OnClickListener that was called, false 3924 * otherwise is returned. 3925 */ 3926 public boolean callOnClick() { 3927 ListenerInfo li = mListenerInfo; 3928 if (li != null && li.mOnClickListener != null) { 3929 li.mOnClickListener.onClick(this); 3930 return true; 3931 } 3932 return false; 3933 } 3934 3935 /** 3936 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3937 * OnLongClickListener did not consume the event. 3938 * 3939 * @return True if one of the above receivers consumed the event, false otherwise. 3940 */ 3941 public boolean performLongClick() { 3942 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3943 3944 boolean handled = false; 3945 ListenerInfo li = mListenerInfo; 3946 if (li != null && li.mOnLongClickListener != null) { 3947 handled = li.mOnLongClickListener.onLongClick(View.this); 3948 } 3949 if (!handled) { 3950 handled = showContextMenu(); 3951 } 3952 if (handled) { 3953 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3954 } 3955 return handled; 3956 } 3957 3958 /** 3959 * Performs button-related actions during a touch down event. 3960 * 3961 * @param event The event. 3962 * @return True if the down was consumed. 3963 * 3964 * @hide 3965 */ 3966 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3967 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3968 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3969 return true; 3970 } 3971 } 3972 return false; 3973 } 3974 3975 /** 3976 * Bring up the context menu for this view. 3977 * 3978 * @return Whether a context menu was displayed. 3979 */ 3980 public boolean showContextMenu() { 3981 return getParent().showContextMenuForChild(this); 3982 } 3983 3984 /** 3985 * Bring up the context menu for this view, referring to the item under the specified point. 3986 * 3987 * @param x The referenced x coordinate. 3988 * @param y The referenced y coordinate. 3989 * @param metaState The keyboard modifiers that were pressed. 3990 * @return Whether a context menu was displayed. 3991 * 3992 * @hide 3993 */ 3994 public boolean showContextMenu(float x, float y, int metaState) { 3995 return showContextMenu(); 3996 } 3997 3998 /** 3999 * Start an action mode. 4000 * 4001 * @param callback Callback that will control the lifecycle of the action mode 4002 * @return The new action mode if it is started, null otherwise 4003 * 4004 * @see ActionMode 4005 */ 4006 public ActionMode startActionMode(ActionMode.Callback callback) { 4007 ViewParent parent = getParent(); 4008 if (parent == null) return null; 4009 return parent.startActionModeForChild(this, callback); 4010 } 4011 4012 /** 4013 * Register a callback to be invoked when a key is pressed in this view. 4014 * @param l the key listener to attach to this view 4015 */ 4016 public void setOnKeyListener(OnKeyListener l) { 4017 getListenerInfo().mOnKeyListener = l; 4018 } 4019 4020 /** 4021 * Register a callback to be invoked when a touch event is sent to this view. 4022 * @param l the touch listener to attach to this view 4023 */ 4024 public void setOnTouchListener(OnTouchListener l) { 4025 getListenerInfo().mOnTouchListener = l; 4026 } 4027 4028 /** 4029 * Register a callback to be invoked when a generic motion event is sent to this view. 4030 * @param l the generic motion listener to attach to this view 4031 */ 4032 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4033 getListenerInfo().mOnGenericMotionListener = l; 4034 } 4035 4036 /** 4037 * Register a callback to be invoked when a hover event is sent to this view. 4038 * @param l the hover listener to attach to this view 4039 */ 4040 public void setOnHoverListener(OnHoverListener l) { 4041 getListenerInfo().mOnHoverListener = l; 4042 } 4043 4044 /** 4045 * Register a drag event listener callback object for this View. The parameter is 4046 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4047 * View, the system calls the 4048 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4049 * @param l An implementation of {@link android.view.View.OnDragListener}. 4050 */ 4051 public void setOnDragListener(OnDragListener l) { 4052 getListenerInfo().mOnDragListener = l; 4053 } 4054 4055 /** 4056 * Give this view focus. This will cause 4057 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4058 * 4059 * Note: this does not check whether this {@link View} should get focus, it just 4060 * gives it focus no matter what. It should only be called internally by framework 4061 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4062 * 4063 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4064 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4065 * focus moved when requestFocus() is called. It may not always 4066 * apply, in which case use the default View.FOCUS_DOWN. 4067 * @param previouslyFocusedRect The rectangle of the view that had focus 4068 * prior in this View's coordinate system. 4069 */ 4070 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4071 if (DBG) { 4072 System.out.println(this + " requestFocus()"); 4073 } 4074 4075 if ((mPrivateFlags & FOCUSED) == 0) { 4076 mPrivateFlags |= FOCUSED; 4077 4078 if (mParent != null) { 4079 mParent.requestChildFocus(this, this); 4080 } 4081 4082 onFocusChanged(true, direction, previouslyFocusedRect); 4083 refreshDrawableState(); 4084 4085 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4086 notifyAccessibilityStateChanged(); 4087 } 4088 } 4089 } 4090 4091 /** 4092 * Request that a rectangle of this view be visible on the screen, 4093 * scrolling if necessary just enough. 4094 * 4095 * <p>A View should call this if it maintains some notion of which part 4096 * of its content is interesting. For example, a text editing view 4097 * should call this when its cursor moves. 4098 * 4099 * @param rectangle The rectangle. 4100 * @return Whether any parent scrolled. 4101 */ 4102 public boolean requestRectangleOnScreen(Rect rectangle) { 4103 return requestRectangleOnScreen(rectangle, false); 4104 } 4105 4106 /** 4107 * Request that a rectangle of this view be visible on the screen, 4108 * scrolling if necessary just enough. 4109 * 4110 * <p>A View should call this if it maintains some notion of which part 4111 * of its content is interesting. For example, a text editing view 4112 * should call this when its cursor moves. 4113 * 4114 * <p>When <code>immediate</code> is set to true, scrolling will not be 4115 * animated. 4116 * 4117 * @param rectangle The rectangle. 4118 * @param immediate True to forbid animated scrolling, false otherwise 4119 * @return Whether any parent scrolled. 4120 */ 4121 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4122 View child = this; 4123 ViewParent parent = mParent; 4124 boolean scrolled = false; 4125 while (parent != null) { 4126 scrolled |= parent.requestChildRectangleOnScreen(child, 4127 rectangle, immediate); 4128 4129 // offset rect so next call has the rectangle in the 4130 // coordinate system of its direct child. 4131 rectangle.offset(child.getLeft(), child.getTop()); 4132 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4133 4134 if (!(parent instanceof View)) { 4135 break; 4136 } 4137 4138 child = (View) parent; 4139 parent = child.getParent(); 4140 } 4141 return scrolled; 4142 } 4143 4144 /** 4145 * Called when this view wants to give up focus. If focus is cleared 4146 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4147 * <p> 4148 * <strong>Note:</strong> When a View clears focus the framework is trying 4149 * to give focus to the first focusable View from the top. Hence, if this 4150 * View is the first from the top that can take focus, then all callbacks 4151 * related to clearing focus will be invoked after wich the framework will 4152 * give focus to this view. 4153 * </p> 4154 */ 4155 public void clearFocus() { 4156 if (DBG) { 4157 System.out.println(this + " clearFocus()"); 4158 } 4159 4160 if ((mPrivateFlags & FOCUSED) != 0) { 4161 mPrivateFlags &= ~FOCUSED; 4162 4163 if (mParent != null) { 4164 mParent.clearChildFocus(this); 4165 } 4166 4167 onFocusChanged(false, 0, null); 4168 4169 refreshDrawableState(); 4170 4171 ensureInputFocusOnFirstFocusable(); 4172 4173 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4174 notifyAccessibilityStateChanged(); 4175 } 4176 } 4177 } 4178 4179 void ensureInputFocusOnFirstFocusable() { 4180 View root = getRootView(); 4181 if (root != null) { 4182 root.requestFocus(); 4183 } 4184 } 4185 4186 /** 4187 * Called internally by the view system when a new view is getting focus. 4188 * This is what clears the old focus. 4189 */ 4190 void unFocus() { 4191 if (DBG) { 4192 System.out.println(this + " unFocus()"); 4193 } 4194 4195 if ((mPrivateFlags & FOCUSED) != 0) { 4196 mPrivateFlags &= ~FOCUSED; 4197 4198 onFocusChanged(false, 0, null); 4199 refreshDrawableState(); 4200 4201 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4202 notifyAccessibilityStateChanged(); 4203 } 4204 } 4205 } 4206 4207 /** 4208 * Returns true if this view has focus iteself, or is the ancestor of the 4209 * view that has focus. 4210 * 4211 * @return True if this view has or contains focus, false otherwise. 4212 */ 4213 @ViewDebug.ExportedProperty(category = "focus") 4214 public boolean hasFocus() { 4215 return (mPrivateFlags & FOCUSED) != 0; 4216 } 4217 4218 /** 4219 * Returns true if this view is focusable or if it contains a reachable View 4220 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4221 * is a View whose parents do not block descendants focus. 4222 * 4223 * Only {@link #VISIBLE} views are considered focusable. 4224 * 4225 * @return True if the view is focusable or if the view contains a focusable 4226 * View, false otherwise. 4227 * 4228 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4229 */ 4230 public boolean hasFocusable() { 4231 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4232 } 4233 4234 /** 4235 * Called by the view system when the focus state of this view changes. 4236 * When the focus change event is caused by directional navigation, direction 4237 * and previouslyFocusedRect provide insight into where the focus is coming from. 4238 * When overriding, be sure to call up through to the super class so that 4239 * the standard focus handling will occur. 4240 * 4241 * @param gainFocus True if the View has focus; false otherwise. 4242 * @param direction The direction focus has moved when requestFocus() 4243 * is called to give this view focus. Values are 4244 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4245 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4246 * It may not always apply, in which case use the default. 4247 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4248 * system, of the previously focused view. If applicable, this will be 4249 * passed in as finer grained information about where the focus is coming 4250 * from (in addition to direction). Will be <code>null</code> otherwise. 4251 */ 4252 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4253 if (gainFocus) { 4254 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4255 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4256 requestAccessibilityFocus(); 4257 } 4258 } 4259 4260 InputMethodManager imm = InputMethodManager.peekInstance(); 4261 if (!gainFocus) { 4262 if (isPressed()) { 4263 setPressed(false); 4264 } 4265 if (imm != null && mAttachInfo != null 4266 && mAttachInfo.mHasWindowFocus) { 4267 imm.focusOut(this); 4268 } 4269 onFocusLost(); 4270 } else if (imm != null && mAttachInfo != null 4271 && mAttachInfo.mHasWindowFocus) { 4272 imm.focusIn(this); 4273 } 4274 4275 invalidate(true); 4276 ListenerInfo li = mListenerInfo; 4277 if (li != null && li.mOnFocusChangeListener != null) { 4278 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4279 } 4280 4281 if (mAttachInfo != null) { 4282 mAttachInfo.mKeyDispatchState.reset(this); 4283 } 4284 } 4285 4286 /** 4287 * Sends an accessibility event of the given type. If accessiiblity is 4288 * not enabled this method has no effect. The default implementation calls 4289 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4290 * to populate information about the event source (this View), then calls 4291 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4292 * populate the text content of the event source including its descendants, 4293 * and last calls 4294 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4295 * on its parent to resuest sending of the event to interested parties. 4296 * <p> 4297 * If an {@link AccessibilityDelegate} has been specified via calling 4298 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4299 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4300 * responsible for handling this call. 4301 * </p> 4302 * 4303 * @param eventType The type of the event to send, as defined by several types from 4304 * {@link android.view.accessibility.AccessibilityEvent}, such as 4305 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4306 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4307 * 4308 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4309 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4310 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4311 * @see AccessibilityDelegate 4312 */ 4313 public void sendAccessibilityEvent(int eventType) { 4314 if (mAccessibilityDelegate != null) { 4315 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4316 } else { 4317 sendAccessibilityEventInternal(eventType); 4318 } 4319 } 4320 4321 /** 4322 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4323 * {@link AccessibilityEvent} to make an announcement which is related to some 4324 * sort of a context change for which none of the events representing UI transitions 4325 * is a good fit. For example, announcing a new page in a book. If accessibility 4326 * is not enabled this method does nothing. 4327 * 4328 * @param text The announcement text. 4329 */ 4330 public void announceForAccessibility(CharSequence text) { 4331 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4332 AccessibilityEvent event = AccessibilityEvent.obtain( 4333 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4334 event.getText().add(text); 4335 sendAccessibilityEventUnchecked(event); 4336 } 4337 } 4338 4339 /** 4340 * @see #sendAccessibilityEvent(int) 4341 * 4342 * Note: Called from the default {@link AccessibilityDelegate}. 4343 */ 4344 void sendAccessibilityEventInternal(int eventType) { 4345 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4346 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4347 } 4348 } 4349 4350 /** 4351 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4352 * takes as an argument an empty {@link AccessibilityEvent} and does not 4353 * perform a check whether accessibility is enabled. 4354 * <p> 4355 * If an {@link AccessibilityDelegate} has been specified via calling 4356 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4357 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4358 * is responsible for handling this call. 4359 * </p> 4360 * 4361 * @param event The event to send. 4362 * 4363 * @see #sendAccessibilityEvent(int) 4364 */ 4365 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4366 if (mAccessibilityDelegate != null) { 4367 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4368 } else { 4369 sendAccessibilityEventUncheckedInternal(event); 4370 } 4371 } 4372 4373 /** 4374 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4375 * 4376 * Note: Called from the default {@link AccessibilityDelegate}. 4377 */ 4378 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4379 if (!isShown()) { 4380 return; 4381 } 4382 onInitializeAccessibilityEvent(event); 4383 // Only a subset of accessibility events populates text content. 4384 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4385 dispatchPopulateAccessibilityEvent(event); 4386 } 4387 // Intercept accessibility focus events fired by virtual nodes to keep 4388 // track of accessibility focus position in such nodes. 4389 final int eventType = event.getEventType(); 4390 switch (eventType) { 4391 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED: { 4392 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4393 event.getSourceNodeId()); 4394 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4395 ViewRootImpl viewRootImpl = getViewRootImpl(); 4396 if (viewRootImpl != null) { 4397 viewRootImpl.setAccessibilityFocusedHost(this); 4398 } 4399 } 4400 } break; 4401 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: { 4402 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4403 event.getSourceNodeId()); 4404 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4405 ViewRootImpl viewRootImpl = getViewRootImpl(); 4406 if (viewRootImpl != null) { 4407 viewRootImpl.setAccessibilityFocusedHost(null); 4408 } 4409 } 4410 } break; 4411 } 4412 // In the beginning we called #isShown(), so we know that getParent() is not null. 4413 getParent().requestSendAccessibilityEvent(this, event); 4414 } 4415 4416 /** 4417 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4418 * to its children for adding their text content to the event. Note that the 4419 * event text is populated in a separate dispatch path since we add to the 4420 * event not only the text of the source but also the text of all its descendants. 4421 * A typical implementation will call 4422 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4423 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4424 * on each child. Override this method if custom population of the event text 4425 * content is required. 4426 * <p> 4427 * If an {@link AccessibilityDelegate} has been specified via calling 4428 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4429 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4430 * is responsible for handling this call. 4431 * </p> 4432 * <p> 4433 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4434 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4435 * </p> 4436 * 4437 * @param event The event. 4438 * 4439 * @return True if the event population was completed. 4440 */ 4441 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4442 if (mAccessibilityDelegate != null) { 4443 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4444 } else { 4445 return dispatchPopulateAccessibilityEventInternal(event); 4446 } 4447 } 4448 4449 /** 4450 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4451 * 4452 * Note: Called from the default {@link AccessibilityDelegate}. 4453 */ 4454 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4455 onPopulateAccessibilityEvent(event); 4456 return false; 4457 } 4458 4459 /** 4460 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4461 * giving a chance to this View to populate the accessibility event with its 4462 * text content. While this method is free to modify event 4463 * attributes other than text content, doing so should normally be performed in 4464 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4465 * <p> 4466 * Example: Adding formatted date string to an accessibility event in addition 4467 * to the text added by the super implementation: 4468 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4469 * super.onPopulateAccessibilityEvent(event); 4470 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4471 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4472 * mCurrentDate.getTimeInMillis(), flags); 4473 * event.getText().add(selectedDateUtterance); 4474 * }</pre> 4475 * <p> 4476 * If an {@link AccessibilityDelegate} has been specified via calling 4477 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4478 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4479 * is responsible for handling this call. 4480 * </p> 4481 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4482 * information to the event, in case the default implementation has basic information to add. 4483 * </p> 4484 * 4485 * @param event The accessibility event which to populate. 4486 * 4487 * @see #sendAccessibilityEvent(int) 4488 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4489 */ 4490 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4491 if (mAccessibilityDelegate != null) { 4492 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4493 } else { 4494 onPopulateAccessibilityEventInternal(event); 4495 } 4496 } 4497 4498 /** 4499 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4500 * 4501 * Note: Called from the default {@link AccessibilityDelegate}. 4502 */ 4503 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4504 4505 } 4506 4507 /** 4508 * Initializes an {@link AccessibilityEvent} with information about 4509 * this View which is the event source. In other words, the source of 4510 * an accessibility event is the view whose state change triggered firing 4511 * the event. 4512 * <p> 4513 * Example: Setting the password property of an event in addition 4514 * to properties set by the super implementation: 4515 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4516 * super.onInitializeAccessibilityEvent(event); 4517 * event.setPassword(true); 4518 * }</pre> 4519 * <p> 4520 * If an {@link AccessibilityDelegate} has been specified via calling 4521 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4522 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4523 * is responsible for handling this call. 4524 * </p> 4525 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4526 * information to the event, in case the default implementation has basic information to add. 4527 * </p> 4528 * @param event The event to initialize. 4529 * 4530 * @see #sendAccessibilityEvent(int) 4531 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4532 */ 4533 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4534 if (mAccessibilityDelegate != null) { 4535 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4536 } else { 4537 onInitializeAccessibilityEventInternal(event); 4538 } 4539 } 4540 4541 /** 4542 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4543 * 4544 * Note: Called from the default {@link AccessibilityDelegate}. 4545 */ 4546 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4547 event.setSource(this); 4548 event.setClassName(View.class.getName()); 4549 event.setPackageName(getContext().getPackageName()); 4550 event.setEnabled(isEnabled()); 4551 event.setContentDescription(mContentDescription); 4552 4553 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4554 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4555 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4556 FOCUSABLES_ALL); 4557 event.setItemCount(focusablesTempList.size()); 4558 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4559 focusablesTempList.clear(); 4560 } 4561 } 4562 4563 /** 4564 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4565 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4566 * This method is responsible for obtaining an accessibility node info from a 4567 * pool of reusable instances and calling 4568 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4569 * initialize the former. 4570 * <p> 4571 * Note: The client is responsible for recycling the obtained instance by calling 4572 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4573 * </p> 4574 * 4575 * @return A populated {@link AccessibilityNodeInfo}. 4576 * 4577 * @see AccessibilityNodeInfo 4578 */ 4579 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4580 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4581 if (provider != null) { 4582 return provider.createAccessibilityNodeInfo(View.NO_ID); 4583 } else { 4584 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4585 onInitializeAccessibilityNodeInfo(info); 4586 return info; 4587 } 4588 } 4589 4590 /** 4591 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4592 * The base implementation sets: 4593 * <ul> 4594 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4595 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4596 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4597 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4598 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4599 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4600 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4601 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4602 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4603 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4604 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4605 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4606 * </ul> 4607 * <p> 4608 * Subclasses should override this method, call the super implementation, 4609 * and set additional attributes. 4610 * </p> 4611 * <p> 4612 * If an {@link AccessibilityDelegate} has been specified via calling 4613 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4614 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4615 * is responsible for handling this call. 4616 * </p> 4617 * 4618 * @param info The instance to initialize. 4619 */ 4620 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4621 if (mAccessibilityDelegate != null) { 4622 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4623 } else { 4624 onInitializeAccessibilityNodeInfoInternal(info); 4625 } 4626 } 4627 4628 /** 4629 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4630 * 4631 * Note: Called from the default {@link AccessibilityDelegate}. 4632 */ 4633 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4634 Rect bounds = mAttachInfo.mTmpInvalRect; 4635 getDrawingRect(bounds); 4636 info.setBoundsInParent(bounds); 4637 4638 getGlobalVisibleRect(bounds); 4639 bounds.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4640 info.setBoundsInScreen(bounds); 4641 4642 if ((mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 4643 ViewParent parent = getParentForAccessibility(); 4644 if (parent instanceof View) { 4645 info.setParent((View) parent); 4646 } 4647 } 4648 4649 info.setPackageName(mContext.getPackageName()); 4650 info.setClassName(View.class.getName()); 4651 info.setContentDescription(getContentDescription()); 4652 4653 info.setEnabled(isEnabled()); 4654 info.setClickable(isClickable()); 4655 info.setFocusable(isFocusable()); 4656 info.setFocused(isFocused()); 4657 info.setAccessibilityFocused(isAccessibilityFocused()); 4658 info.setSelected(isSelected()); 4659 info.setLongClickable(isLongClickable()); 4660 4661 // TODO: These make sense only if we are in an AdapterView but all 4662 // views can be selected. Maybe from accessiiblity perspective 4663 // we should report as selectable view in an AdapterView. 4664 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4665 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4666 4667 if (isFocusable()) { 4668 if (isFocused()) { 4669 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4670 } else { 4671 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4672 } 4673 } 4674 } 4675 4676 /** 4677 * Sets a delegate for implementing accessibility support via compositon as 4678 * opposed to inheritance. The delegate's primary use is for implementing 4679 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4680 * 4681 * @param delegate The delegate instance. 4682 * 4683 * @see AccessibilityDelegate 4684 */ 4685 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4686 mAccessibilityDelegate = delegate; 4687 } 4688 4689 /** 4690 * Gets the provider for managing a virtual view hierarchy rooted at this View 4691 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4692 * that explore the window content. 4693 * <p> 4694 * If this method returns an instance, this instance is responsible for managing 4695 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4696 * View including the one representing the View itself. Similarly the returned 4697 * instance is responsible for performing accessibility actions on any virtual 4698 * view or the root view itself. 4699 * </p> 4700 * <p> 4701 * If an {@link AccessibilityDelegate} has been specified via calling 4702 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4703 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4704 * is responsible for handling this call. 4705 * </p> 4706 * 4707 * @return The provider. 4708 * 4709 * @see AccessibilityNodeProvider 4710 */ 4711 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4712 if (mAccessibilityDelegate != null) { 4713 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4714 } else { 4715 return null; 4716 } 4717 } 4718 4719 /** 4720 * Gets the unique identifier of this view on the screen for accessibility purposes. 4721 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4722 * 4723 * @return The view accessibility id. 4724 * 4725 * @hide 4726 */ 4727 public int getAccessibilityViewId() { 4728 if (mAccessibilityViewId == NO_ID) { 4729 mAccessibilityViewId = sNextAccessibilityViewId++; 4730 } 4731 return mAccessibilityViewId; 4732 } 4733 4734 /** 4735 * Gets the unique identifier of the window in which this View reseides. 4736 * 4737 * @return The window accessibility id. 4738 * 4739 * @hide 4740 */ 4741 public int getAccessibilityWindowId() { 4742 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4743 } 4744 4745 /** 4746 * Gets the {@link View} description. It briefly describes the view and is 4747 * primarily used for accessibility support. Set this property to enable 4748 * better accessibility support for your application. This is especially 4749 * true for views that do not have textual representation (For example, 4750 * ImageButton). 4751 * 4752 * @return The content description. 4753 * 4754 * @attr ref android.R.styleable#View_contentDescription 4755 */ 4756 @ViewDebug.ExportedProperty(category = "accessibility") 4757 public CharSequence getContentDescription() { 4758 return mContentDescription; 4759 } 4760 4761 /** 4762 * Sets the {@link View} description. It briefly describes the view and is 4763 * primarily used for accessibility support. Set this property to enable 4764 * better accessibility support for your application. This is especially 4765 * true for views that do not have textual representation (For example, 4766 * ImageButton). 4767 * 4768 * @param contentDescription The content description. 4769 * 4770 * @attr ref android.R.styleable#View_contentDescription 4771 */ 4772 @RemotableViewMethod 4773 public void setContentDescription(CharSequence contentDescription) { 4774 mContentDescription = contentDescription; 4775 } 4776 4777 /** 4778 * Invoked whenever this view loses focus, either by losing window focus or by losing 4779 * focus within its window. This method can be used to clear any state tied to the 4780 * focus. For instance, if a button is held pressed with the trackball and the window 4781 * loses focus, this method can be used to cancel the press. 4782 * 4783 * Subclasses of View overriding this method should always call super.onFocusLost(). 4784 * 4785 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4786 * @see #onWindowFocusChanged(boolean) 4787 * 4788 * @hide pending API council approval 4789 */ 4790 protected void onFocusLost() { 4791 resetPressedState(); 4792 } 4793 4794 private void resetPressedState() { 4795 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4796 return; 4797 } 4798 4799 if (isPressed()) { 4800 setPressed(false); 4801 4802 if (!mHasPerformedLongPress) { 4803 removeLongPressCallback(); 4804 } 4805 } 4806 } 4807 4808 /** 4809 * Returns true if this view has focus 4810 * 4811 * @return True if this view has focus, false otherwise. 4812 */ 4813 @ViewDebug.ExportedProperty(category = "focus") 4814 public boolean isFocused() { 4815 return (mPrivateFlags & FOCUSED) != 0; 4816 } 4817 4818 /** 4819 * Find the view in the hierarchy rooted at this view that currently has 4820 * focus. 4821 * 4822 * @return The view that currently has focus, or null if no focused view can 4823 * be found. 4824 */ 4825 public View findFocus() { 4826 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4827 } 4828 4829 /** 4830 * Indicates whether this view is one of the set of scrollable containers in 4831 * its window. 4832 * 4833 * @return whether this view is one of the set of scrollable containers in 4834 * its window 4835 * 4836 * @attr ref android.R.styleable#View_isScrollContainer 4837 */ 4838 public boolean isScrollContainer() { 4839 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 4840 } 4841 4842 /** 4843 * Change whether this view is one of the set of scrollable containers in 4844 * its window. This will be used to determine whether the window can 4845 * resize or must pan when a soft input area is open -- scrollable 4846 * containers allow the window to use resize mode since the container 4847 * will appropriately shrink. 4848 * 4849 * @attr ref android.R.styleable#View_isScrollContainer 4850 */ 4851 public void setScrollContainer(boolean isScrollContainer) { 4852 if (isScrollContainer) { 4853 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4854 mAttachInfo.mScrollContainers.add(this); 4855 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4856 } 4857 mPrivateFlags |= SCROLL_CONTAINER; 4858 } else { 4859 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4860 mAttachInfo.mScrollContainers.remove(this); 4861 } 4862 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4863 } 4864 } 4865 4866 /** 4867 * Returns the quality of the drawing cache. 4868 * 4869 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4870 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4871 * 4872 * @see #setDrawingCacheQuality(int) 4873 * @see #setDrawingCacheEnabled(boolean) 4874 * @see #isDrawingCacheEnabled() 4875 * 4876 * @attr ref android.R.styleable#View_drawingCacheQuality 4877 */ 4878 public int getDrawingCacheQuality() { 4879 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4880 } 4881 4882 /** 4883 * Set the drawing cache quality of this view. This value is used only when the 4884 * drawing cache is enabled 4885 * 4886 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4887 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4888 * 4889 * @see #getDrawingCacheQuality() 4890 * @see #setDrawingCacheEnabled(boolean) 4891 * @see #isDrawingCacheEnabled() 4892 * 4893 * @attr ref android.R.styleable#View_drawingCacheQuality 4894 */ 4895 public void setDrawingCacheQuality(int quality) { 4896 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 4897 } 4898 4899 /** 4900 * Returns whether the screen should remain on, corresponding to the current 4901 * value of {@link #KEEP_SCREEN_ON}. 4902 * 4903 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 4904 * 4905 * @see #setKeepScreenOn(boolean) 4906 * 4907 * @attr ref android.R.styleable#View_keepScreenOn 4908 */ 4909 public boolean getKeepScreenOn() { 4910 return (mViewFlags & KEEP_SCREEN_ON) != 0; 4911 } 4912 4913 /** 4914 * Controls whether the screen should remain on, modifying the 4915 * value of {@link #KEEP_SCREEN_ON}. 4916 * 4917 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 4918 * 4919 * @see #getKeepScreenOn() 4920 * 4921 * @attr ref android.R.styleable#View_keepScreenOn 4922 */ 4923 public void setKeepScreenOn(boolean keepScreenOn) { 4924 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 4925 } 4926 4927 /** 4928 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4929 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4930 * 4931 * @attr ref android.R.styleable#View_nextFocusLeft 4932 */ 4933 public int getNextFocusLeftId() { 4934 return mNextFocusLeftId; 4935 } 4936 4937 /** 4938 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4939 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 4940 * decide automatically. 4941 * 4942 * @attr ref android.R.styleable#View_nextFocusLeft 4943 */ 4944 public void setNextFocusLeftId(int nextFocusLeftId) { 4945 mNextFocusLeftId = nextFocusLeftId; 4946 } 4947 4948 /** 4949 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4950 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4951 * 4952 * @attr ref android.R.styleable#View_nextFocusRight 4953 */ 4954 public int getNextFocusRightId() { 4955 return mNextFocusRightId; 4956 } 4957 4958 /** 4959 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4960 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 4961 * decide automatically. 4962 * 4963 * @attr ref android.R.styleable#View_nextFocusRight 4964 */ 4965 public void setNextFocusRightId(int nextFocusRightId) { 4966 mNextFocusRightId = nextFocusRightId; 4967 } 4968 4969 /** 4970 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4971 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4972 * 4973 * @attr ref android.R.styleable#View_nextFocusUp 4974 */ 4975 public int getNextFocusUpId() { 4976 return mNextFocusUpId; 4977 } 4978 4979 /** 4980 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4981 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 4982 * decide automatically. 4983 * 4984 * @attr ref android.R.styleable#View_nextFocusUp 4985 */ 4986 public void setNextFocusUpId(int nextFocusUpId) { 4987 mNextFocusUpId = nextFocusUpId; 4988 } 4989 4990 /** 4991 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4992 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4993 * 4994 * @attr ref android.R.styleable#View_nextFocusDown 4995 */ 4996 public int getNextFocusDownId() { 4997 return mNextFocusDownId; 4998 } 4999 5000 /** 5001 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5002 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5003 * decide automatically. 5004 * 5005 * @attr ref android.R.styleable#View_nextFocusDown 5006 */ 5007 public void setNextFocusDownId(int nextFocusDownId) { 5008 mNextFocusDownId = nextFocusDownId; 5009 } 5010 5011 /** 5012 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5013 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5014 * 5015 * @attr ref android.R.styleable#View_nextFocusForward 5016 */ 5017 public int getNextFocusForwardId() { 5018 return mNextFocusForwardId; 5019 } 5020 5021 /** 5022 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5023 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5024 * decide automatically. 5025 * 5026 * @attr ref android.R.styleable#View_nextFocusForward 5027 */ 5028 public void setNextFocusForwardId(int nextFocusForwardId) { 5029 mNextFocusForwardId = nextFocusForwardId; 5030 } 5031 5032 /** 5033 * Returns the visibility of this view and all of its ancestors 5034 * 5035 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5036 */ 5037 public boolean isShown() { 5038 View current = this; 5039 //noinspection ConstantConditions 5040 do { 5041 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5042 return false; 5043 } 5044 ViewParent parent = current.mParent; 5045 if (parent == null) { 5046 return false; // We are not attached to the view root 5047 } 5048 if (!(parent instanceof View)) { 5049 return true; 5050 } 5051 current = (View) parent; 5052 } while (current != null); 5053 5054 return false; 5055 } 5056 5057 /** 5058 * Called by the view hierarchy when the content insets for a window have 5059 * changed, to allow it to adjust its content to fit within those windows. 5060 * The content insets tell you the space that the status bar, input method, 5061 * and other system windows infringe on the application's window. 5062 * 5063 * <p>You do not normally need to deal with this function, since the default 5064 * window decoration given to applications takes care of applying it to the 5065 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5066 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5067 * and your content can be placed under those system elements. You can then 5068 * use this method within your view hierarchy if you have parts of your UI 5069 * which you would like to ensure are not being covered. 5070 * 5071 * <p>The default implementation of this method simply applies the content 5072 * inset's to the view's padding. This can be enabled through 5073 * {@link #setFitsSystemWindows(boolean)}. Alternatively, you can override 5074 * the method and handle the insets however you would like. Note that the 5075 * insets provided by the framework are always relative to the far edges 5076 * of the window, not accounting for the location of the called view within 5077 * that window. (In fact when this method is called you do not yet know 5078 * where the layout will place the view, as it is done before layout happens.) 5079 * 5080 * <p>Note: unlike many View methods, there is no dispatch phase to this 5081 * call. If you are overriding it in a ViewGroup and want to allow the 5082 * call to continue to your children, you must be sure to call the super 5083 * implementation. 5084 * 5085 * @param insets Current content insets of the window. Prior to 5086 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5087 * the insets or else you and Android will be unhappy. 5088 * 5089 * @return Return true if this view applied the insets and it should not 5090 * continue propagating further down the hierarchy, false otherwise. 5091 */ 5092 protected boolean fitSystemWindows(Rect insets) { 5093 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5094 mUserPaddingStart = -1; 5095 mUserPaddingEnd = -1; 5096 mUserPaddingRelative = false; 5097 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5098 || mAttachInfo == null 5099 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5100 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5101 return true; 5102 } else { 5103 internalSetPadding(0, 0, 0, 0); 5104 return false; 5105 } 5106 } 5107 return false; 5108 } 5109 5110 /** 5111 * Set whether or not this view should account for system screen decorations 5112 * such as the status bar and inset its content. This allows this view to be 5113 * positioned in absolute screen coordinates and remain visible to the user. 5114 * 5115 * <p>This should only be used by top-level window decor views. 5116 * 5117 * @param fitSystemWindows true to inset content for system screen decorations, false for 5118 * default behavior. 5119 * 5120 * @attr ref android.R.styleable#View_fitsSystemWindows 5121 */ 5122 public void setFitsSystemWindows(boolean fitSystemWindows) { 5123 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5124 } 5125 5126 /** 5127 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 5128 * will account for system screen decorations such as the status bar and inset its 5129 * content. This allows the view to be positioned in absolute screen coordinates 5130 * and remain visible to the user. 5131 * 5132 * @return true if this view will adjust its content bounds for system screen decorations. 5133 * 5134 * @attr ref android.R.styleable#View_fitsSystemWindows 5135 */ 5136 public boolean fitsSystemWindows() { 5137 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5138 } 5139 5140 /** 5141 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5142 */ 5143 public void requestFitSystemWindows() { 5144 if (mParent != null) { 5145 mParent.requestFitSystemWindows(); 5146 } 5147 } 5148 5149 /** 5150 * For use by PhoneWindow to make its own system window fitting optional. 5151 * @hide 5152 */ 5153 public void makeOptionalFitsSystemWindows() { 5154 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5155 } 5156 5157 /** 5158 * Returns the visibility status for this view. 5159 * 5160 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5161 * @attr ref android.R.styleable#View_visibility 5162 */ 5163 @ViewDebug.ExportedProperty(mapping = { 5164 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5165 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5166 @ViewDebug.IntToString(from = GONE, to = "GONE") 5167 }) 5168 public int getVisibility() { 5169 return mViewFlags & VISIBILITY_MASK; 5170 } 5171 5172 /** 5173 * Set the enabled state of this view. 5174 * 5175 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5176 * @attr ref android.R.styleable#View_visibility 5177 */ 5178 @RemotableViewMethod 5179 public void setVisibility(int visibility) { 5180 setFlags(visibility, VISIBILITY_MASK); 5181 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5182 } 5183 5184 /** 5185 * Returns the enabled status for this view. The interpretation of the 5186 * enabled state varies by subclass. 5187 * 5188 * @return True if this view is enabled, false otherwise. 5189 */ 5190 @ViewDebug.ExportedProperty 5191 public boolean isEnabled() { 5192 return (mViewFlags & ENABLED_MASK) == ENABLED; 5193 } 5194 5195 /** 5196 * Set the enabled state of this view. The interpretation of the enabled 5197 * state varies by subclass. 5198 * 5199 * @param enabled True if this view is enabled, false otherwise. 5200 */ 5201 @RemotableViewMethod 5202 public void setEnabled(boolean enabled) { 5203 if (enabled == isEnabled()) return; 5204 5205 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5206 5207 /* 5208 * The View most likely has to change its appearance, so refresh 5209 * the drawable state. 5210 */ 5211 refreshDrawableState(); 5212 5213 // Invalidate too, since the default behavior for views is to be 5214 // be drawn at 50% alpha rather than to change the drawable. 5215 invalidate(true); 5216 } 5217 5218 /** 5219 * Set whether this view can receive the focus. 5220 * 5221 * Setting this to false will also ensure that this view is not focusable 5222 * in touch mode. 5223 * 5224 * @param focusable If true, this view can receive the focus. 5225 * 5226 * @see #setFocusableInTouchMode(boolean) 5227 * @attr ref android.R.styleable#View_focusable 5228 */ 5229 public void setFocusable(boolean focusable) { 5230 if (!focusable) { 5231 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5232 } 5233 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5234 } 5235 5236 /** 5237 * Set whether this view can receive focus while in touch mode. 5238 * 5239 * Setting this to true will also ensure that this view is focusable. 5240 * 5241 * @param focusableInTouchMode If true, this view can receive the focus while 5242 * in touch mode. 5243 * 5244 * @see #setFocusable(boolean) 5245 * @attr ref android.R.styleable#View_focusableInTouchMode 5246 */ 5247 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5248 // Focusable in touch mode should always be set before the focusable flag 5249 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5250 // which, in touch mode, will not successfully request focus on this view 5251 // because the focusable in touch mode flag is not set 5252 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5253 if (focusableInTouchMode) { 5254 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5255 } 5256 } 5257 5258 /** 5259 * Set whether this view should have sound effects enabled for events such as 5260 * clicking and touching. 5261 * 5262 * <p>You may wish to disable sound effects for a view if you already play sounds, 5263 * for instance, a dial key that plays dtmf tones. 5264 * 5265 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5266 * @see #isSoundEffectsEnabled() 5267 * @see #playSoundEffect(int) 5268 * @attr ref android.R.styleable#View_soundEffectsEnabled 5269 */ 5270 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5271 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5272 } 5273 5274 /** 5275 * @return whether this view should have sound effects enabled for events such as 5276 * clicking and touching. 5277 * 5278 * @see #setSoundEffectsEnabled(boolean) 5279 * @see #playSoundEffect(int) 5280 * @attr ref android.R.styleable#View_soundEffectsEnabled 5281 */ 5282 @ViewDebug.ExportedProperty 5283 public boolean isSoundEffectsEnabled() { 5284 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5285 } 5286 5287 /** 5288 * Set whether this view should have haptic feedback for events such as 5289 * long presses. 5290 * 5291 * <p>You may wish to disable haptic feedback if your view already controls 5292 * its own haptic feedback. 5293 * 5294 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5295 * @see #isHapticFeedbackEnabled() 5296 * @see #performHapticFeedback(int) 5297 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5298 */ 5299 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5300 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5301 } 5302 5303 /** 5304 * @return whether this view should have haptic feedback enabled for events 5305 * long presses. 5306 * 5307 * @see #setHapticFeedbackEnabled(boolean) 5308 * @see #performHapticFeedback(int) 5309 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5310 */ 5311 @ViewDebug.ExportedProperty 5312 public boolean isHapticFeedbackEnabled() { 5313 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5314 } 5315 5316 /** 5317 * Returns the layout direction for this view. 5318 * 5319 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5320 * {@link #LAYOUT_DIRECTION_RTL}, 5321 * {@link #LAYOUT_DIRECTION_INHERIT} or 5322 * {@link #LAYOUT_DIRECTION_LOCALE}. 5323 * @attr ref android.R.styleable#View_layoutDirection 5324 */ 5325 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5326 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5327 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5328 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5329 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5330 }) 5331 public int getLayoutDirection() { 5332 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5333 } 5334 5335 /** 5336 * Set the layout direction for this view. This will propagate a reset of layout direction 5337 * resolution to the view's children and resolve layout direction for this view. 5338 * 5339 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5340 * {@link #LAYOUT_DIRECTION_RTL}, 5341 * {@link #LAYOUT_DIRECTION_INHERIT} or 5342 * {@link #LAYOUT_DIRECTION_LOCALE}. 5343 * 5344 * @attr ref android.R.styleable#View_layoutDirection 5345 */ 5346 @RemotableViewMethod 5347 public void setLayoutDirection(int layoutDirection) { 5348 if (getLayoutDirection() != layoutDirection) { 5349 // Reset the current layout direction and the resolved one 5350 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5351 resetResolvedLayoutDirection(); 5352 // Set the new layout direction (filtered) and ask for a layout pass 5353 mPrivateFlags2 |= 5354 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5355 requestLayout(); 5356 } 5357 } 5358 5359 /** 5360 * Returns the resolved layout direction for this view. 5361 * 5362 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5363 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5364 */ 5365 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5366 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5367 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5368 }) 5369 public int getResolvedLayoutDirection() { 5370 // The layout diretion will be resolved only if needed 5371 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5372 resolveLayoutDirection(); 5373 } 5374 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5375 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5376 } 5377 5378 /** 5379 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5380 * layout attribute and/or the inherited value from the parent 5381 * 5382 * @return true if the layout is right-to-left. 5383 */ 5384 @ViewDebug.ExportedProperty(category = "layout") 5385 public boolean isLayoutRtl() { 5386 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5387 } 5388 5389 /** 5390 * Indicates whether the view is currently tracking transient state that the 5391 * app should not need to concern itself with saving and restoring, but that 5392 * the framework should take special note to preserve when possible. 5393 * 5394 * @return true if the view has transient state 5395 */ 5396 @ViewDebug.ExportedProperty(category = "layout") 5397 public boolean hasTransientState() { 5398 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5399 } 5400 5401 /** 5402 * Set whether this view is currently tracking transient state that the 5403 * framework should attempt to preserve when possible. 5404 * 5405 * @param hasTransientState true if this view has transient state 5406 */ 5407 public void setHasTransientState(boolean hasTransientState) { 5408 if (hasTransientState() == hasTransientState) return; 5409 5410 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5411 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5412 if (mParent != null) { 5413 try { 5414 mParent.childHasTransientStateChanged(this, hasTransientState); 5415 } catch (AbstractMethodError e) { 5416 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5417 " does not fully implement ViewParent", e); 5418 } 5419 } 5420 } 5421 5422 /** 5423 * If this view doesn't do any drawing on its own, set this flag to 5424 * allow further optimizations. By default, this flag is not set on 5425 * View, but could be set on some View subclasses such as ViewGroup. 5426 * 5427 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5428 * you should clear this flag. 5429 * 5430 * @param willNotDraw whether or not this View draw on its own 5431 */ 5432 public void setWillNotDraw(boolean willNotDraw) { 5433 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5434 } 5435 5436 /** 5437 * Returns whether or not this View draws on its own. 5438 * 5439 * @return true if this view has nothing to draw, false otherwise 5440 */ 5441 @ViewDebug.ExportedProperty(category = "drawing") 5442 public boolean willNotDraw() { 5443 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5444 } 5445 5446 /** 5447 * When a View's drawing cache is enabled, drawing is redirected to an 5448 * offscreen bitmap. Some views, like an ImageView, must be able to 5449 * bypass this mechanism if they already draw a single bitmap, to avoid 5450 * unnecessary usage of the memory. 5451 * 5452 * @param willNotCacheDrawing true if this view does not cache its 5453 * drawing, false otherwise 5454 */ 5455 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5456 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5457 } 5458 5459 /** 5460 * Returns whether or not this View can cache its drawing or not. 5461 * 5462 * @return true if this view does not cache its drawing, false otherwise 5463 */ 5464 @ViewDebug.ExportedProperty(category = "drawing") 5465 public boolean willNotCacheDrawing() { 5466 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5467 } 5468 5469 /** 5470 * Indicates whether this view reacts to click events or not. 5471 * 5472 * @return true if the view is clickable, false otherwise 5473 * 5474 * @see #setClickable(boolean) 5475 * @attr ref android.R.styleable#View_clickable 5476 */ 5477 @ViewDebug.ExportedProperty 5478 public boolean isClickable() { 5479 return (mViewFlags & CLICKABLE) == CLICKABLE; 5480 } 5481 5482 /** 5483 * Enables or disables click events for this view. When a view 5484 * is clickable it will change its state to "pressed" on every click. 5485 * Subclasses should set the view clickable to visually react to 5486 * user's clicks. 5487 * 5488 * @param clickable true to make the view clickable, false otherwise 5489 * 5490 * @see #isClickable() 5491 * @attr ref android.R.styleable#View_clickable 5492 */ 5493 public void setClickable(boolean clickable) { 5494 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5495 } 5496 5497 /** 5498 * Indicates whether this view reacts to long click events or not. 5499 * 5500 * @return true if the view is long clickable, false otherwise 5501 * 5502 * @see #setLongClickable(boolean) 5503 * @attr ref android.R.styleable#View_longClickable 5504 */ 5505 public boolean isLongClickable() { 5506 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5507 } 5508 5509 /** 5510 * Enables or disables long click events for this view. When a view is long 5511 * clickable it reacts to the user holding down the button for a longer 5512 * duration than a tap. This event can either launch the listener or a 5513 * context menu. 5514 * 5515 * @param longClickable true to make the view long clickable, false otherwise 5516 * @see #isLongClickable() 5517 * @attr ref android.R.styleable#View_longClickable 5518 */ 5519 public void setLongClickable(boolean longClickable) { 5520 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5521 } 5522 5523 /** 5524 * Sets the pressed state for this view. 5525 * 5526 * @see #isClickable() 5527 * @see #setClickable(boolean) 5528 * 5529 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5530 * the View's internal state from a previously set "pressed" state. 5531 */ 5532 public void setPressed(boolean pressed) { 5533 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5534 5535 if (pressed) { 5536 mPrivateFlags |= PRESSED; 5537 } else { 5538 mPrivateFlags &= ~PRESSED; 5539 } 5540 5541 if (needsRefresh) { 5542 refreshDrawableState(); 5543 } 5544 dispatchSetPressed(pressed); 5545 } 5546 5547 /** 5548 * Dispatch setPressed to all of this View's children. 5549 * 5550 * @see #setPressed(boolean) 5551 * 5552 * @param pressed The new pressed state 5553 */ 5554 protected void dispatchSetPressed(boolean pressed) { 5555 } 5556 5557 /** 5558 * Indicates whether the view is currently in pressed state. Unless 5559 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5560 * the pressed state. 5561 * 5562 * @see #setPressed(boolean) 5563 * @see #isClickable() 5564 * @see #setClickable(boolean) 5565 * 5566 * @return true if the view is currently pressed, false otherwise 5567 */ 5568 public boolean isPressed() { 5569 return (mPrivateFlags & PRESSED) == PRESSED; 5570 } 5571 5572 /** 5573 * Indicates whether this view will save its state (that is, 5574 * whether its {@link #onSaveInstanceState} method will be called). 5575 * 5576 * @return Returns true if the view state saving is enabled, else false. 5577 * 5578 * @see #setSaveEnabled(boolean) 5579 * @attr ref android.R.styleable#View_saveEnabled 5580 */ 5581 public boolean isSaveEnabled() { 5582 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5583 } 5584 5585 /** 5586 * Controls whether the saving of this view's state is 5587 * enabled (that is, whether its {@link #onSaveInstanceState} method 5588 * will be called). Note that even if freezing is enabled, the 5589 * view still must have an id assigned to it (via {@link #setId(int)}) 5590 * for its state to be saved. This flag can only disable the 5591 * saving of this view; any child views may still have their state saved. 5592 * 5593 * @param enabled Set to false to <em>disable</em> state saving, or true 5594 * (the default) to allow it. 5595 * 5596 * @see #isSaveEnabled() 5597 * @see #setId(int) 5598 * @see #onSaveInstanceState() 5599 * @attr ref android.R.styleable#View_saveEnabled 5600 */ 5601 public void setSaveEnabled(boolean enabled) { 5602 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5603 } 5604 5605 /** 5606 * Gets whether the framework should discard touches when the view's 5607 * window is obscured by another visible window. 5608 * Refer to the {@link View} security documentation for more details. 5609 * 5610 * @return True if touch filtering is enabled. 5611 * 5612 * @see #setFilterTouchesWhenObscured(boolean) 5613 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5614 */ 5615 @ViewDebug.ExportedProperty 5616 public boolean getFilterTouchesWhenObscured() { 5617 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5618 } 5619 5620 /** 5621 * Sets whether the framework should discard touches when the view's 5622 * window is obscured by another visible window. 5623 * Refer to the {@link View} security documentation for more details. 5624 * 5625 * @param enabled True if touch filtering should be enabled. 5626 * 5627 * @see #getFilterTouchesWhenObscured 5628 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5629 */ 5630 public void setFilterTouchesWhenObscured(boolean enabled) { 5631 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5632 FILTER_TOUCHES_WHEN_OBSCURED); 5633 } 5634 5635 /** 5636 * Indicates whether the entire hierarchy under this view will save its 5637 * state when a state saving traversal occurs from its parent. The default 5638 * is true; if false, these views will not be saved unless 5639 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5640 * 5641 * @return Returns true if the view state saving from parent is enabled, else false. 5642 * 5643 * @see #setSaveFromParentEnabled(boolean) 5644 */ 5645 public boolean isSaveFromParentEnabled() { 5646 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5647 } 5648 5649 /** 5650 * Controls whether the entire hierarchy under this view will save its 5651 * state when a state saving traversal occurs from its parent. The default 5652 * is true; if false, these views will not be saved unless 5653 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5654 * 5655 * @param enabled Set to false to <em>disable</em> state saving, or true 5656 * (the default) to allow it. 5657 * 5658 * @see #isSaveFromParentEnabled() 5659 * @see #setId(int) 5660 * @see #onSaveInstanceState() 5661 */ 5662 public void setSaveFromParentEnabled(boolean enabled) { 5663 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5664 } 5665 5666 5667 /** 5668 * Returns whether this View is able to take focus. 5669 * 5670 * @return True if this view can take focus, or false otherwise. 5671 * @attr ref android.R.styleable#View_focusable 5672 */ 5673 @ViewDebug.ExportedProperty(category = "focus") 5674 public final boolean isFocusable() { 5675 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5676 } 5677 5678 /** 5679 * When a view is focusable, it may not want to take focus when in touch mode. 5680 * For example, a button would like focus when the user is navigating via a D-pad 5681 * so that the user can click on it, but once the user starts touching the screen, 5682 * the button shouldn't take focus 5683 * @return Whether the view is focusable in touch mode. 5684 * @attr ref android.R.styleable#View_focusableInTouchMode 5685 */ 5686 @ViewDebug.ExportedProperty 5687 public final boolean isFocusableInTouchMode() { 5688 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5689 } 5690 5691 /** 5692 * Find the nearest view in the specified direction that can take focus. 5693 * This does not actually give focus to that view. 5694 * 5695 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5696 * 5697 * @return The nearest focusable in the specified direction, or null if none 5698 * can be found. 5699 */ 5700 public View focusSearch(int direction) { 5701 if (mParent != null) { 5702 return mParent.focusSearch(this, direction); 5703 } else { 5704 return null; 5705 } 5706 } 5707 5708 /** 5709 * This method is the last chance for the focused view and its ancestors to 5710 * respond to an arrow key. This is called when the focused view did not 5711 * consume the key internally, nor could the view system find a new view in 5712 * the requested direction to give focus to. 5713 * 5714 * @param focused The currently focused view. 5715 * @param direction The direction focus wants to move. One of FOCUS_UP, 5716 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5717 * @return True if the this view consumed this unhandled move. 5718 */ 5719 public boolean dispatchUnhandledMove(View focused, int direction) { 5720 return false; 5721 } 5722 5723 /** 5724 * If a user manually specified the next view id for a particular direction, 5725 * use the root to look up the view. 5726 * @param root The root view of the hierarchy containing this view. 5727 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5728 * or FOCUS_BACKWARD. 5729 * @return The user specified next view, or null if there is none. 5730 */ 5731 View findUserSetNextFocus(View root, int direction) { 5732 switch (direction) { 5733 case FOCUS_LEFT: 5734 if (mNextFocusLeftId == View.NO_ID) return null; 5735 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5736 case FOCUS_RIGHT: 5737 if (mNextFocusRightId == View.NO_ID) return null; 5738 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5739 case FOCUS_UP: 5740 if (mNextFocusUpId == View.NO_ID) return null; 5741 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5742 case FOCUS_DOWN: 5743 if (mNextFocusDownId == View.NO_ID) return null; 5744 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5745 case FOCUS_FORWARD: 5746 if (mNextFocusForwardId == View.NO_ID) return null; 5747 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5748 case FOCUS_BACKWARD: { 5749 if (mID == View.NO_ID) return null; 5750 final int id = mID; 5751 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5752 @Override 5753 public boolean apply(View t) { 5754 return t.mNextFocusForwardId == id; 5755 } 5756 }); 5757 } 5758 } 5759 return null; 5760 } 5761 5762 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5763 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5764 @Override 5765 public boolean apply(View t) { 5766 return t.mID == childViewId; 5767 } 5768 }); 5769 5770 if (result == null) { 5771 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5772 + "by user for id " + childViewId); 5773 } 5774 return result; 5775 } 5776 5777 /** 5778 * Find and return all focusable views that are descendants of this view, 5779 * possibly including this view if it is focusable itself. 5780 * 5781 * @param direction The direction of the focus 5782 * @return A list of focusable views 5783 */ 5784 public ArrayList<View> getFocusables(int direction) { 5785 ArrayList<View> result = new ArrayList<View>(24); 5786 addFocusables(result, direction); 5787 return result; 5788 } 5789 5790 /** 5791 * Add any focusable views that are descendants of this view (possibly 5792 * including this view if it is focusable itself) to views. If we are in touch mode, 5793 * only add views that are also focusable in touch mode. 5794 * 5795 * @param views Focusable views found so far 5796 * @param direction The direction of the focus 5797 */ 5798 public void addFocusables(ArrayList<View> views, int direction) { 5799 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 5800 } 5801 5802 /** 5803 * Adds any focusable views that are descendants of this view (possibly 5804 * including this view if it is focusable itself) to views. This method 5805 * adds all focusable views regardless if we are in touch mode or 5806 * only views focusable in touch mode if we are in touch mode or 5807 * only views that can take accessibility focus if accessibility is enabeld 5808 * depending on the focusable mode paramater. 5809 * 5810 * @param views Focusable views found so far or null if all we are interested is 5811 * the number of focusables. 5812 * @param direction The direction of the focus. 5813 * @param focusableMode The type of focusables to be added. 5814 * 5815 * @see #FOCUSABLES_ALL 5816 * @see #FOCUSABLES_TOUCH_MODE 5817 */ 5818 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 5819 if (views == null) { 5820 return; 5821 } 5822 if ((focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 5823 if (AccessibilityManager.getInstance(mContext).isEnabled() 5824 && includeForAccessibility()) { 5825 views.add(this); 5826 return; 5827 } 5828 } 5829 if (!isFocusable()) { 5830 return; 5831 } 5832 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 5833 && isInTouchMode() && !isFocusableInTouchMode()) { 5834 return; 5835 } 5836 views.add(this); 5837 } 5838 5839 /** 5840 * Finds the Views that contain given text. The containment is case insensitive. 5841 * The search is performed by either the text that the View renders or the content 5842 * description that describes the view for accessibility purposes and the view does 5843 * not render or both. Clients can specify how the search is to be performed via 5844 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 5845 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 5846 * 5847 * @param outViews The output list of matching Views. 5848 * @param searched The text to match against. 5849 * 5850 * @see #FIND_VIEWS_WITH_TEXT 5851 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 5852 * @see #setContentDescription(CharSequence) 5853 */ 5854 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 5855 if (getAccessibilityNodeProvider() != null) { 5856 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 5857 outViews.add(this); 5858 } 5859 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 5860 && !TextUtils.isEmpty(searched) && !TextUtils.isEmpty(mContentDescription)) { 5861 String searchedLowerCase = searched.toString().toLowerCase(); 5862 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 5863 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 5864 outViews.add(this); 5865 } 5866 } 5867 } 5868 5869 /** 5870 * Find and return all touchable views that are descendants of this view, 5871 * possibly including this view if it is touchable itself. 5872 * 5873 * @return A list of touchable views 5874 */ 5875 public ArrayList<View> getTouchables() { 5876 ArrayList<View> result = new ArrayList<View>(); 5877 addTouchables(result); 5878 return result; 5879 } 5880 5881 /** 5882 * Add any touchable views that are descendants of this view (possibly 5883 * including this view if it is touchable itself) to views. 5884 * 5885 * @param views Touchable views found so far 5886 */ 5887 public void addTouchables(ArrayList<View> views) { 5888 final int viewFlags = mViewFlags; 5889 5890 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 5891 && (viewFlags & ENABLED_MASK) == ENABLED) { 5892 views.add(this); 5893 } 5894 } 5895 5896 /** 5897 * Returns whether this View is accessibility focused. 5898 * 5899 * @return True if this View is accessibility focused. 5900 */ 5901 boolean isAccessibilityFocused() { 5902 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 5903 } 5904 5905 /** 5906 * Call this to try to give accessibility focus to this view. 5907 * 5908 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 5909 * returns false or the view is no visible or the view already has accessibility 5910 * focus. 5911 * 5912 * See also {@link #focusSearch(int)}, which is what you call to say that you 5913 * have focus, and you want your parent to look for the next one. 5914 * 5915 * @return Whether this view actually took accessibility focus. 5916 * 5917 * @hide 5918 */ 5919 public boolean requestAccessibilityFocus() { 5920 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 5921 return false; 5922 } 5923 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5924 return false; 5925 } 5926 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 5927 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 5928 ViewRootImpl viewRootImpl = getViewRootImpl(); 5929 if (viewRootImpl != null) { 5930 viewRootImpl.setAccessibilityFocusedHost(this); 5931 } 5932 invalidate(); 5933 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 5934 notifyAccessibilityStateChanged(); 5935 // Try to give input focus to this view - not a descendant. 5936 requestFocusNoSearch(View.FOCUS_DOWN, null); 5937 return true; 5938 } 5939 return false; 5940 } 5941 5942 /** 5943 * Call this to try to clear accessibility focus of this view. 5944 * 5945 * See also {@link #focusSearch(int)}, which is what you call to say that you 5946 * have focus, and you want your parent to look for the next one. 5947 * 5948 * @hide 5949 */ 5950 public void clearAccessibilityFocus() { 5951 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 5952 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 5953 ViewRootImpl viewRootImpl = getViewRootImpl(); 5954 if (viewRootImpl != null) { 5955 viewRootImpl.setAccessibilityFocusedHost(null); 5956 } 5957 invalidate(); 5958 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 5959 notifyAccessibilityStateChanged(); 5960 // Try to move accessibility focus to the input focus. 5961 View rootView = getRootView(); 5962 if (rootView != null) { 5963 View inputFocus = rootView.findFocus(); 5964 if (inputFocus != null) { 5965 inputFocus.requestAccessibilityFocus(); 5966 } 5967 } 5968 } 5969 } 5970 5971 /** 5972 * Find the best view to take accessibility focus from a hover. 5973 * This function finds the deepest actionable view and if that 5974 * fails ask the parent to take accessibility focus from hover. 5975 * 5976 * @param x The X hovered location in this view coorditantes. 5977 * @param y The Y hovered location in this view coorditantes. 5978 * @return Whether the request was handled. 5979 * 5980 * @hide 5981 */ 5982 public boolean requestAccessibilityFocusFromHover(float x, float y) { 5983 if (onRequestAccessibilityFocusFromHover(x, y)) { 5984 return true; 5985 } 5986 ViewParent parent = mParent; 5987 if (parent instanceof View) { 5988 View parentView = (View) parent; 5989 5990 float[] position = mAttachInfo.mTmpTransformLocation; 5991 position[0] = x; 5992 position[1] = y; 5993 5994 // Compensate for the transformation of the current matrix. 5995 if (!hasIdentityMatrix()) { 5996 getMatrix().mapPoints(position); 5997 } 5998 5999 // Compensate for the parent scroll and the offset 6000 // of this view stop from the parent top. 6001 position[0] += mLeft - parentView.mScrollX; 6002 position[1] += mTop - parentView.mScrollY; 6003 6004 return parentView.requestAccessibilityFocusFromHover(position[0], position[1]); 6005 } 6006 return false; 6007 } 6008 6009 /** 6010 * Requests to give this View focus from hover. 6011 * 6012 * @param x The X hovered location in this view coorditantes. 6013 * @param y The Y hovered location in this view coorditantes. 6014 * @return Whether the request was handled. 6015 * 6016 * @hide 6017 */ 6018 public boolean onRequestAccessibilityFocusFromHover(float x, float y) { 6019 if (includeForAccessibility() 6020 && (isActionableForAccessibility() || hasListenersForAccessibility())) { 6021 return requestAccessibilityFocus(); 6022 } 6023 return false; 6024 } 6025 6026 /** 6027 * Clears accessibility focus without calling any callback methods 6028 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6029 * is used for clearing accessibility focus when giving this focus to 6030 * another view. 6031 */ 6032 void clearAccessibilityFocusNoCallbacks() { 6033 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6034 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6035 invalidate(); 6036 } 6037 } 6038 6039 /** 6040 * Call this to try to give focus to a specific view or to one of its 6041 * descendants. 6042 * 6043 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6044 * false), or if it is focusable and it is not focusable in touch mode 6045 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6046 * 6047 * See also {@link #focusSearch(int)}, which is what you call to say that you 6048 * have focus, and you want your parent to look for the next one. 6049 * 6050 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6051 * {@link #FOCUS_DOWN} and <code>null</code>. 6052 * 6053 * @return Whether this view or one of its descendants actually took focus. 6054 */ 6055 public final boolean requestFocus() { 6056 return requestFocus(View.FOCUS_DOWN); 6057 } 6058 6059 /** 6060 * Call this to try to give focus to a specific view or to one of its 6061 * descendants and give it a hint about what direction focus is heading. 6062 * 6063 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6064 * false), or if it is focusable and it is not focusable in touch mode 6065 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6066 * 6067 * See also {@link #focusSearch(int)}, which is what you call to say that you 6068 * have focus, and you want your parent to look for the next one. 6069 * 6070 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6071 * <code>null</code> set for the previously focused rectangle. 6072 * 6073 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6074 * @return Whether this view or one of its descendants actually took focus. 6075 */ 6076 public final boolean requestFocus(int direction) { 6077 return requestFocus(direction, null); 6078 } 6079 6080 /** 6081 * Call this to try to give focus to a specific view or to one of its descendants 6082 * and give it hints about the direction and a specific rectangle that the focus 6083 * is coming from. The rectangle can help give larger views a finer grained hint 6084 * about where focus is coming from, and therefore, where to show selection, or 6085 * forward focus change internally. 6086 * 6087 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6088 * false), or if it is focusable and it is not focusable in touch mode 6089 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6090 * 6091 * A View will not take focus if it is not visible. 6092 * 6093 * A View will not take focus if one of its parents has 6094 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6095 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6096 * 6097 * See also {@link #focusSearch(int)}, which is what you call to say that you 6098 * have focus, and you want your parent to look for the next one. 6099 * 6100 * You may wish to override this method if your custom {@link View} has an internal 6101 * {@link View} that it wishes to forward the request to. 6102 * 6103 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6104 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6105 * to give a finer grained hint about where focus is coming from. May be null 6106 * if there is no hint. 6107 * @return Whether this view or one of its descendants actually took focus. 6108 */ 6109 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6110 return requestFocusNoSearch(direction, previouslyFocusedRect); 6111 } 6112 6113 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6114 // need to be focusable 6115 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6116 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6117 return false; 6118 } 6119 6120 // need to be focusable in touch mode if in touch mode 6121 if (isInTouchMode() && 6122 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6123 return false; 6124 } 6125 6126 // need to not have any parents blocking us 6127 if (hasAncestorThatBlocksDescendantFocus()) { 6128 return false; 6129 } 6130 6131 handleFocusGainInternal(direction, previouslyFocusedRect); 6132 return true; 6133 } 6134 6135 /** 6136 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6137 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6138 * touch mode to request focus when they are touched. 6139 * 6140 * @return Whether this view or one of its descendants actually took focus. 6141 * 6142 * @see #isInTouchMode() 6143 * 6144 */ 6145 public final boolean requestFocusFromTouch() { 6146 // Leave touch mode if we need to 6147 if (isInTouchMode()) { 6148 ViewRootImpl viewRoot = getViewRootImpl(); 6149 if (viewRoot != null) { 6150 viewRoot.ensureTouchMode(false); 6151 } 6152 } 6153 return requestFocus(View.FOCUS_DOWN); 6154 } 6155 6156 /** 6157 * @return Whether any ancestor of this view blocks descendant focus. 6158 */ 6159 private boolean hasAncestorThatBlocksDescendantFocus() { 6160 ViewParent ancestor = mParent; 6161 while (ancestor instanceof ViewGroup) { 6162 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6163 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6164 return true; 6165 } else { 6166 ancestor = vgAncestor.getParent(); 6167 } 6168 } 6169 return false; 6170 } 6171 6172 /** 6173 * Gets the mode for determining whether this View is important for accessibility 6174 * which is if it fires accessibility events and if it is reported to 6175 * accessibility services that query the screen. 6176 * 6177 * @return The mode for determining whether a View is important for accessibility. 6178 * 6179 * @attr ref android.R.styleable#View_importantForAccessibility 6180 * 6181 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6182 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6183 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6184 */ 6185 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6186 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, 6187 to = "IMPORTANT_FOR_ACCESSIBILITY_AUTO"), 6188 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, 6189 to = "IMPORTANT_FOR_ACCESSIBILITY_YES"), 6190 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, 6191 to = "IMPORTANT_FOR_ACCESSIBILITY_NO") 6192 }) 6193 public int getImportantForAccessibility() { 6194 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6195 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6196 } 6197 6198 /** 6199 * Sets how to determine whether this view is important for accessibility 6200 * which is if it fires accessibility events and if it is reported to 6201 * accessibility services that query the screen. 6202 * 6203 * @param mode How to determine whether this view is important for accessibility. 6204 * 6205 * @attr ref android.R.styleable#View_importantForAccessibility 6206 * 6207 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6208 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6209 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6210 */ 6211 public void setImportantForAccessibility(int mode) { 6212 if (mode != getImportantForAccessibility()) { 6213 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6214 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6215 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6216 notifyAccessibilityStateChanged(); 6217 } 6218 } 6219 6220 /** 6221 * Gets whether this view should be exposed for accessibility. 6222 * 6223 * @return Whether the view is exposed for accessibility. 6224 * 6225 * @hide 6226 */ 6227 public boolean isImportantForAccessibility() { 6228 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6229 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6230 switch (mode) { 6231 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6232 return true; 6233 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6234 return false; 6235 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6236 return isActionableForAccessibility() || hasListenersForAccessibility(); 6237 default: 6238 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6239 + mode); 6240 } 6241 } 6242 6243 /** 6244 * Gets the parent for accessibility purposes. Note that the parent for 6245 * accessibility is not necessary the immediate parent. It is the first 6246 * predecessor that is important for accessibility. 6247 * 6248 * @return The parent for accessibility purposes. 6249 */ 6250 public ViewParent getParentForAccessibility() { 6251 if (mParent instanceof View) { 6252 View parentView = (View) mParent; 6253 if (parentView.includeForAccessibility()) { 6254 return mParent; 6255 } else { 6256 return mParent.getParentForAccessibility(); 6257 } 6258 } 6259 return null; 6260 } 6261 6262 /** 6263 * Adds the children of a given View for accessibility. Since some Views are 6264 * not important for accessibility the children for accessibility are not 6265 * necessarily direct children of the riew, rather they are the first level of 6266 * descendants important for accessibility. 6267 * 6268 * @param children The list of children for accessibility. 6269 */ 6270 public void addChildrenForAccessibility(ArrayList<View> children) { 6271 if (includeForAccessibility()) { 6272 children.add(this); 6273 } 6274 } 6275 6276 /** 6277 * Whether to regard this view for accessibility. A view is regarded for 6278 * accessibility if it is important for accessibility or the querying 6279 * accessibility service has explicitly requested that view not 6280 * important for accessibility are regarded. 6281 * 6282 * @return Whether to regard the view for accessibility. 6283 */ 6284 boolean includeForAccessibility() { 6285 if (mAttachInfo != null) { 6286 if (!mAttachInfo.mIncludeNotImportantViews) { 6287 return isImportantForAccessibility(); 6288 } else { 6289 return true; 6290 } 6291 } 6292 return false; 6293 } 6294 6295 /** 6296 * Returns whether the View is considered actionable from 6297 * accessibility perspective. Such view are important for 6298 * accessiiblity. 6299 * 6300 * @return True if the view is actionable for accessibility. 6301 */ 6302 private boolean isActionableForAccessibility() { 6303 return (isClickable() || isLongClickable() || isFocusable()); 6304 } 6305 6306 /** 6307 * Returns whether the View has registered callbacks wich makes it 6308 * important for accessiiblity. 6309 * 6310 * @return True if the view is actionable for accessibility. 6311 */ 6312 private boolean hasListenersForAccessibility() { 6313 ListenerInfo info = getListenerInfo(); 6314 return mTouchDelegate != null || info.mOnKeyListener != null 6315 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6316 || info.mOnHoverListener != null || info.mOnDragListener != null; 6317 } 6318 6319 /** 6320 * Notifies accessibility services that some view's important for 6321 * accessibility state has changed. Note that such notifications 6322 * are made at most once every 6323 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6324 * to avoid unnecessary load to the system. Also once a view has 6325 * made a notifucation this method is a NOP until the notification has 6326 * been sent to clients. 6327 * 6328 * @hide 6329 * 6330 * TODO: Makse sure this method is called for any view state change 6331 * that is interesting for accessilility purposes. 6332 */ 6333 public void notifyAccessibilityStateChanged() { 6334 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6335 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6336 if (mParent != null) { 6337 mParent.childAccessibilityStateChanged(this); 6338 } 6339 } 6340 } 6341 6342 /** 6343 * Reset the state indicating the this view has requested clients 6344 * interested in its accessiblity state to be notified. 6345 * 6346 * @hide 6347 */ 6348 public void resetAccessibilityStateChanged() { 6349 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6350 } 6351 6352 /** 6353 * Performs the specified accessibility action on the view. For 6354 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6355 * 6356 * @param action The action to perform. 6357 * @return Whether the action was performed. 6358 */ 6359 public boolean performAccessibilityAction(int action) { 6360 switch (action) { 6361 case AccessibilityNodeInfo.ACTION_CLICK: { 6362 if (isClickable()) { 6363 performClick(); 6364 } 6365 } break; 6366 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6367 if (isLongClickable()) { 6368 performLongClick(); 6369 } 6370 } break; 6371 case AccessibilityNodeInfo.ACTION_FOCUS: { 6372 if (!hasFocus()) { 6373 // Get out of touch mode since accessibility 6374 // wants to move focus around. 6375 getViewRootImpl().ensureTouchMode(false); 6376 return requestFocus(); 6377 } 6378 } break; 6379 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6380 if (hasFocus()) { 6381 clearFocus(); 6382 return !isFocused(); 6383 } 6384 } break; 6385 case AccessibilityNodeInfo.ACTION_SELECT: { 6386 if (!isSelected()) { 6387 setSelected(true); 6388 return isSelected(); 6389 } 6390 } break; 6391 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6392 if (isSelected()) { 6393 setSelected(false); 6394 return !isSelected(); 6395 } 6396 } break; 6397 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6398 if (!isAccessibilityFocused()) { 6399 return requestAccessibilityFocus(); 6400 } 6401 } break; 6402 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6403 if (isAccessibilityFocused()) { 6404 clearAccessibilityFocus(); 6405 return true; 6406 } 6407 } break; 6408 } 6409 return false; 6410 } 6411 6412 /** 6413 * @hide 6414 */ 6415 public void dispatchStartTemporaryDetach() { 6416 onStartTemporaryDetach(); 6417 } 6418 6419 /** 6420 * This is called when a container is going to temporarily detach a child, with 6421 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6422 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6423 * {@link #onDetachedFromWindow()} when the container is done. 6424 */ 6425 public void onStartTemporaryDetach() { 6426 removeUnsetPressCallback(); 6427 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6428 } 6429 6430 /** 6431 * @hide 6432 */ 6433 public void dispatchFinishTemporaryDetach() { 6434 onFinishTemporaryDetach(); 6435 } 6436 6437 /** 6438 * Called after {@link #onStartTemporaryDetach} when the container is done 6439 * changing the view. 6440 */ 6441 public void onFinishTemporaryDetach() { 6442 } 6443 6444 /** 6445 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6446 * for this view's window. Returns null if the view is not currently attached 6447 * to the window. Normally you will not need to use this directly, but 6448 * just use the standard high-level event callbacks like 6449 * {@link #onKeyDown(int, KeyEvent)}. 6450 */ 6451 public KeyEvent.DispatcherState getKeyDispatcherState() { 6452 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6453 } 6454 6455 /** 6456 * Dispatch a key event before it is processed by any input method 6457 * associated with the view hierarchy. This can be used to intercept 6458 * key events in special situations before the IME consumes them; a 6459 * typical example would be handling the BACK key to update the application's 6460 * UI instead of allowing the IME to see it and close itself. 6461 * 6462 * @param event The key event to be dispatched. 6463 * @return True if the event was handled, false otherwise. 6464 */ 6465 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6466 return onKeyPreIme(event.getKeyCode(), event); 6467 } 6468 6469 /** 6470 * Dispatch a key event to the next view on the focus path. This path runs 6471 * from the top of the view tree down to the currently focused view. If this 6472 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6473 * the next node down the focus path. This method also fires any key 6474 * listeners. 6475 * 6476 * @param event The key event to be dispatched. 6477 * @return True if the event was handled, false otherwise. 6478 */ 6479 public boolean dispatchKeyEvent(KeyEvent event) { 6480 if (mInputEventConsistencyVerifier != null) { 6481 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6482 } 6483 6484 // Give any attached key listener a first crack at the event. 6485 //noinspection SimplifiableIfStatement 6486 ListenerInfo li = mListenerInfo; 6487 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6488 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6489 return true; 6490 } 6491 6492 if (event.dispatch(this, mAttachInfo != null 6493 ? mAttachInfo.mKeyDispatchState : null, this)) { 6494 return true; 6495 } 6496 6497 if (mInputEventConsistencyVerifier != null) { 6498 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6499 } 6500 return false; 6501 } 6502 6503 /** 6504 * Dispatches a key shortcut event. 6505 * 6506 * @param event The key event to be dispatched. 6507 * @return True if the event was handled by the view, false otherwise. 6508 */ 6509 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6510 return onKeyShortcut(event.getKeyCode(), event); 6511 } 6512 6513 /** 6514 * Pass the touch screen motion event down to the target view, or this 6515 * view if it is the target. 6516 * 6517 * @param event The motion event to be dispatched. 6518 * @return True if the event was handled by the view, false otherwise. 6519 */ 6520 public boolean dispatchTouchEvent(MotionEvent event) { 6521 if (mInputEventConsistencyVerifier != null) { 6522 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6523 } 6524 6525 if (onFilterTouchEventForSecurity(event)) { 6526 //noinspection SimplifiableIfStatement 6527 ListenerInfo li = mListenerInfo; 6528 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6529 && li.mOnTouchListener.onTouch(this, event)) { 6530 return true; 6531 } 6532 6533 if (onTouchEvent(event)) { 6534 return true; 6535 } 6536 } 6537 6538 if (mInputEventConsistencyVerifier != null) { 6539 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6540 } 6541 return false; 6542 } 6543 6544 /** 6545 * Filter the touch event to apply security policies. 6546 * 6547 * @param event The motion event to be filtered. 6548 * @return True if the event should be dispatched, false if the event should be dropped. 6549 * 6550 * @see #getFilterTouchesWhenObscured 6551 */ 6552 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6553 //noinspection RedundantIfStatement 6554 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6555 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6556 // Window is obscured, drop this touch. 6557 return false; 6558 } 6559 return true; 6560 } 6561 6562 /** 6563 * Pass a trackball motion event down to the focused view. 6564 * 6565 * @param event The motion event to be dispatched. 6566 * @return True if the event was handled by the view, false otherwise. 6567 */ 6568 public boolean dispatchTrackballEvent(MotionEvent event) { 6569 if (mInputEventConsistencyVerifier != null) { 6570 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6571 } 6572 6573 return onTrackballEvent(event); 6574 } 6575 6576 /** 6577 * Dispatch a generic motion event. 6578 * <p> 6579 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6580 * are delivered to the view under the pointer. All other generic motion events are 6581 * delivered to the focused view. Hover events are handled specially and are delivered 6582 * to {@link #onHoverEvent(MotionEvent)}. 6583 * </p> 6584 * 6585 * @param event The motion event to be dispatched. 6586 * @return True if the event was handled by the view, false otherwise. 6587 */ 6588 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6589 if (mInputEventConsistencyVerifier != null) { 6590 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6591 } 6592 6593 final int source = event.getSource(); 6594 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6595 final int action = event.getAction(); 6596 if (action == MotionEvent.ACTION_HOVER_ENTER 6597 || action == MotionEvent.ACTION_HOVER_MOVE 6598 || action == MotionEvent.ACTION_HOVER_EXIT) { 6599 if (dispatchHoverEvent(event)) { 6600 return true; 6601 } 6602 } else if (dispatchGenericPointerEvent(event)) { 6603 return true; 6604 } 6605 } else if (dispatchGenericFocusedEvent(event)) { 6606 return true; 6607 } 6608 6609 if (dispatchGenericMotionEventInternal(event)) { 6610 return true; 6611 } 6612 6613 if (mInputEventConsistencyVerifier != null) { 6614 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6615 } 6616 return false; 6617 } 6618 6619 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 6620 //noinspection SimplifiableIfStatement 6621 ListenerInfo li = mListenerInfo; 6622 if (li != null && li.mOnGenericMotionListener != null 6623 && (mViewFlags & ENABLED_MASK) == ENABLED 6624 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 6625 return true; 6626 } 6627 6628 if (onGenericMotionEvent(event)) { 6629 return true; 6630 } 6631 6632 if (mInputEventConsistencyVerifier != null) { 6633 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6634 } 6635 return false; 6636 } 6637 6638 /** 6639 * Dispatch a hover event. 6640 * <p> 6641 * Do not call this method directly. 6642 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6643 * </p> 6644 * 6645 * @param event The motion event to be dispatched. 6646 * @return True if the event was handled by the view, false otherwise. 6647 */ 6648 protected boolean dispatchHoverEvent(MotionEvent event) { 6649 //noinspection SimplifiableIfStatement 6650 ListenerInfo li = mListenerInfo; 6651 if (li != null && li.mOnHoverListener != null 6652 && (mViewFlags & ENABLED_MASK) == ENABLED 6653 && li.mOnHoverListener.onHover(this, event)) { 6654 return true; 6655 } 6656 6657 return onHoverEvent(event); 6658 } 6659 6660 /** 6661 * Returns true if the view has a child to which it has recently sent 6662 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 6663 * it does not have a hovered child, then it must be the innermost hovered view. 6664 * @hide 6665 */ 6666 protected boolean hasHoveredChild() { 6667 return false; 6668 } 6669 6670 /** 6671 * Dispatch a generic motion event to the view under the first pointer. 6672 * <p> 6673 * Do not call this method directly. 6674 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6675 * </p> 6676 * 6677 * @param event The motion event to be dispatched. 6678 * @return True if the event was handled by the view, false otherwise. 6679 */ 6680 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 6681 return false; 6682 } 6683 6684 /** 6685 * Dispatch a generic motion event to the currently focused view. 6686 * <p> 6687 * Do not call this method directly. 6688 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6689 * </p> 6690 * 6691 * @param event The motion event to be dispatched. 6692 * @return True if the event was handled by the view, false otherwise. 6693 */ 6694 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 6695 return false; 6696 } 6697 6698 /** 6699 * Dispatch a pointer event. 6700 * <p> 6701 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 6702 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 6703 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 6704 * and should not be expected to handle other pointing device features. 6705 * </p> 6706 * 6707 * @param event The motion event to be dispatched. 6708 * @return True if the event was handled by the view, false otherwise. 6709 * @hide 6710 */ 6711 public final boolean dispatchPointerEvent(MotionEvent event) { 6712 if (event.isTouchEvent()) { 6713 return dispatchTouchEvent(event); 6714 } else { 6715 return dispatchGenericMotionEvent(event); 6716 } 6717 } 6718 6719 /** 6720 * Called when the window containing this view gains or loses window focus. 6721 * ViewGroups should override to route to their children. 6722 * 6723 * @param hasFocus True if the window containing this view now has focus, 6724 * false otherwise. 6725 */ 6726 public void dispatchWindowFocusChanged(boolean hasFocus) { 6727 onWindowFocusChanged(hasFocus); 6728 } 6729 6730 /** 6731 * Called when the window containing this view gains or loses focus. Note 6732 * that this is separate from view focus: to receive key events, both 6733 * your view and its window must have focus. If a window is displayed 6734 * on top of yours that takes input focus, then your own window will lose 6735 * focus but the view focus will remain unchanged. 6736 * 6737 * @param hasWindowFocus True if the window containing this view now has 6738 * focus, false otherwise. 6739 */ 6740 public void onWindowFocusChanged(boolean hasWindowFocus) { 6741 InputMethodManager imm = InputMethodManager.peekInstance(); 6742 if (!hasWindowFocus) { 6743 if (isPressed()) { 6744 setPressed(false); 6745 } 6746 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 6747 imm.focusOut(this); 6748 } 6749 removeLongPressCallback(); 6750 removeTapCallback(); 6751 onFocusLost(); 6752 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 6753 imm.focusIn(this); 6754 } 6755 refreshDrawableState(); 6756 } 6757 6758 /** 6759 * Returns true if this view is in a window that currently has window focus. 6760 * Note that this is not the same as the view itself having focus. 6761 * 6762 * @return True if this view is in a window that currently has window focus. 6763 */ 6764 public boolean hasWindowFocus() { 6765 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 6766 } 6767 6768 /** 6769 * Dispatch a view visibility change down the view hierarchy. 6770 * ViewGroups should override to route to their children. 6771 * @param changedView The view whose visibility changed. Could be 'this' or 6772 * an ancestor view. 6773 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 6774 * {@link #INVISIBLE} or {@link #GONE}. 6775 */ 6776 protected void dispatchVisibilityChanged(View changedView, int visibility) { 6777 onVisibilityChanged(changedView, visibility); 6778 } 6779 6780 /** 6781 * Called when the visibility of the view or an ancestor of the view is changed. 6782 * @param changedView The view whose visibility changed. Could be 'this' or 6783 * an ancestor view. 6784 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 6785 * {@link #INVISIBLE} or {@link #GONE}. 6786 */ 6787 protected void onVisibilityChanged(View changedView, int visibility) { 6788 if (visibility == VISIBLE) { 6789 if (mAttachInfo != null) { 6790 initialAwakenScrollBars(); 6791 } else { 6792 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 6793 } 6794 } 6795 } 6796 6797 /** 6798 * Dispatch a hint about whether this view is displayed. For instance, when 6799 * a View moves out of the screen, it might receives a display hint indicating 6800 * the view is not displayed. Applications should not <em>rely</em> on this hint 6801 * as there is no guarantee that they will receive one. 6802 * 6803 * @param hint A hint about whether or not this view is displayed: 6804 * {@link #VISIBLE} or {@link #INVISIBLE}. 6805 */ 6806 public void dispatchDisplayHint(int hint) { 6807 onDisplayHint(hint); 6808 } 6809 6810 /** 6811 * Gives this view a hint about whether is displayed or not. For instance, when 6812 * a View moves out of the screen, it might receives a display hint indicating 6813 * the view is not displayed. Applications should not <em>rely</em> on this hint 6814 * as there is no guarantee that they will receive one. 6815 * 6816 * @param hint A hint about whether or not this view is displayed: 6817 * {@link #VISIBLE} or {@link #INVISIBLE}. 6818 */ 6819 protected void onDisplayHint(int hint) { 6820 } 6821 6822 /** 6823 * Dispatch a window visibility change down the view hierarchy. 6824 * ViewGroups should override to route to their children. 6825 * 6826 * @param visibility The new visibility of the window. 6827 * 6828 * @see #onWindowVisibilityChanged(int) 6829 */ 6830 public void dispatchWindowVisibilityChanged(int visibility) { 6831 onWindowVisibilityChanged(visibility); 6832 } 6833 6834 /** 6835 * Called when the window containing has change its visibility 6836 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 6837 * that this tells you whether or not your window is being made visible 6838 * to the window manager; this does <em>not</em> tell you whether or not 6839 * your window is obscured by other windows on the screen, even if it 6840 * is itself visible. 6841 * 6842 * @param visibility The new visibility of the window. 6843 */ 6844 protected void onWindowVisibilityChanged(int visibility) { 6845 if (visibility == VISIBLE) { 6846 initialAwakenScrollBars(); 6847 } 6848 } 6849 6850 /** 6851 * Returns the current visibility of the window this view is attached to 6852 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 6853 * 6854 * @return Returns the current visibility of the view's window. 6855 */ 6856 public int getWindowVisibility() { 6857 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 6858 } 6859 6860 /** 6861 * Retrieve the overall visible display size in which the window this view is 6862 * attached to has been positioned in. This takes into account screen 6863 * decorations above the window, for both cases where the window itself 6864 * is being position inside of them or the window is being placed under 6865 * then and covered insets are used for the window to position its content 6866 * inside. In effect, this tells you the available area where content can 6867 * be placed and remain visible to users. 6868 * 6869 * <p>This function requires an IPC back to the window manager to retrieve 6870 * the requested information, so should not be used in performance critical 6871 * code like drawing. 6872 * 6873 * @param outRect Filled in with the visible display frame. If the view 6874 * is not attached to a window, this is simply the raw display size. 6875 */ 6876 public void getWindowVisibleDisplayFrame(Rect outRect) { 6877 if (mAttachInfo != null) { 6878 try { 6879 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 6880 } catch (RemoteException e) { 6881 return; 6882 } 6883 // XXX This is really broken, and probably all needs to be done 6884 // in the window manager, and we need to know more about whether 6885 // we want the area behind or in front of the IME. 6886 final Rect insets = mAttachInfo.mVisibleInsets; 6887 outRect.left += insets.left; 6888 outRect.top += insets.top; 6889 outRect.right -= insets.right; 6890 outRect.bottom -= insets.bottom; 6891 return; 6892 } 6893 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 6894 d.getRectSize(outRect); 6895 } 6896 6897 /** 6898 * Dispatch a notification about a resource configuration change down 6899 * the view hierarchy. 6900 * ViewGroups should override to route to their children. 6901 * 6902 * @param newConfig The new resource configuration. 6903 * 6904 * @see #onConfigurationChanged(android.content.res.Configuration) 6905 */ 6906 public void dispatchConfigurationChanged(Configuration newConfig) { 6907 onConfigurationChanged(newConfig); 6908 } 6909 6910 /** 6911 * Called when the current configuration of the resources being used 6912 * by the application have changed. You can use this to decide when 6913 * to reload resources that can changed based on orientation and other 6914 * configuration characterstics. You only need to use this if you are 6915 * not relying on the normal {@link android.app.Activity} mechanism of 6916 * recreating the activity instance upon a configuration change. 6917 * 6918 * @param newConfig The new resource configuration. 6919 */ 6920 protected void onConfigurationChanged(Configuration newConfig) { 6921 } 6922 6923 /** 6924 * Private function to aggregate all per-view attributes in to the view 6925 * root. 6926 */ 6927 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 6928 performCollectViewAttributes(attachInfo, visibility); 6929 } 6930 6931 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 6932 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 6933 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 6934 attachInfo.mKeepScreenOn = true; 6935 } 6936 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 6937 ListenerInfo li = mListenerInfo; 6938 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 6939 attachInfo.mHasSystemUiListeners = true; 6940 } 6941 } 6942 } 6943 6944 void needGlobalAttributesUpdate(boolean force) { 6945 final AttachInfo ai = mAttachInfo; 6946 if (ai != null) { 6947 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 6948 || ai.mHasSystemUiListeners) { 6949 ai.mRecomputeGlobalAttributes = true; 6950 } 6951 } 6952 } 6953 6954 /** 6955 * Returns whether the device is currently in touch mode. Touch mode is entered 6956 * once the user begins interacting with the device by touch, and affects various 6957 * things like whether focus is always visible to the user. 6958 * 6959 * @return Whether the device is in touch mode. 6960 */ 6961 @ViewDebug.ExportedProperty 6962 public boolean isInTouchMode() { 6963 if (mAttachInfo != null) { 6964 return mAttachInfo.mInTouchMode; 6965 } else { 6966 return ViewRootImpl.isInTouchMode(); 6967 } 6968 } 6969 6970 /** 6971 * Returns the context the view is running in, through which it can 6972 * access the current theme, resources, etc. 6973 * 6974 * @return The view's Context. 6975 */ 6976 @ViewDebug.CapturedViewProperty 6977 public final Context getContext() { 6978 return mContext; 6979 } 6980 6981 /** 6982 * Handle a key event before it is processed by any input method 6983 * associated with the view hierarchy. This can be used to intercept 6984 * key events in special situations before the IME consumes them; a 6985 * typical example would be handling the BACK key to update the application's 6986 * UI instead of allowing the IME to see it and close itself. 6987 * 6988 * @param keyCode The value in event.getKeyCode(). 6989 * @param event Description of the key event. 6990 * @return If you handled the event, return true. If you want to allow the 6991 * event to be handled by the next receiver, return false. 6992 */ 6993 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 6994 return false; 6995 } 6996 6997 /** 6998 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 6999 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7000 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7001 * is released, if the view is enabled and clickable. 7002 * 7003 * @param keyCode A key code that represents the button pressed, from 7004 * {@link android.view.KeyEvent}. 7005 * @param event The KeyEvent object that defines the button action. 7006 */ 7007 public boolean onKeyDown(int keyCode, KeyEvent event) { 7008 boolean result = false; 7009 7010 switch (keyCode) { 7011 case KeyEvent.KEYCODE_DPAD_CENTER: 7012 case KeyEvent.KEYCODE_ENTER: { 7013 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7014 return true; 7015 } 7016 // Long clickable items don't necessarily have to be clickable 7017 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7018 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7019 (event.getRepeatCount() == 0)) { 7020 setPressed(true); 7021 checkForLongClick(0); 7022 return true; 7023 } 7024 break; 7025 } 7026 } 7027 return result; 7028 } 7029 7030 /** 7031 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7032 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7033 * the event). 7034 */ 7035 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7036 return false; 7037 } 7038 7039 /** 7040 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7041 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7042 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7043 * {@link KeyEvent#KEYCODE_ENTER} is released. 7044 * 7045 * @param keyCode A key code that represents the button pressed, from 7046 * {@link android.view.KeyEvent}. 7047 * @param event The KeyEvent object that defines the button action. 7048 */ 7049 public boolean onKeyUp(int keyCode, KeyEvent event) { 7050 boolean result = false; 7051 7052 switch (keyCode) { 7053 case KeyEvent.KEYCODE_DPAD_CENTER: 7054 case KeyEvent.KEYCODE_ENTER: { 7055 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7056 return true; 7057 } 7058 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7059 setPressed(false); 7060 7061 if (!mHasPerformedLongPress) { 7062 // This is a tap, so remove the longpress check 7063 removeLongPressCallback(); 7064 7065 result = performClick(); 7066 } 7067 } 7068 break; 7069 } 7070 } 7071 return result; 7072 } 7073 7074 /** 7075 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7076 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7077 * the event). 7078 * 7079 * @param keyCode A key code that represents the button pressed, from 7080 * {@link android.view.KeyEvent}. 7081 * @param repeatCount The number of times the action was made. 7082 * @param event The KeyEvent object that defines the button action. 7083 */ 7084 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7085 return false; 7086 } 7087 7088 /** 7089 * Called on the focused view when a key shortcut event is not handled. 7090 * Override this method to implement local key shortcuts for the View. 7091 * Key shortcuts can also be implemented by setting the 7092 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7093 * 7094 * @param keyCode The value in event.getKeyCode(). 7095 * @param event Description of the key event. 7096 * @return If you handled the event, return true. If you want to allow the 7097 * event to be handled by the next receiver, return false. 7098 */ 7099 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7100 return false; 7101 } 7102 7103 /** 7104 * Check whether the called view is a text editor, in which case it 7105 * would make sense to automatically display a soft input window for 7106 * it. Subclasses should override this if they implement 7107 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7108 * a call on that method would return a non-null InputConnection, and 7109 * they are really a first-class editor that the user would normally 7110 * start typing on when the go into a window containing your view. 7111 * 7112 * <p>The default implementation always returns false. This does 7113 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7114 * will not be called or the user can not otherwise perform edits on your 7115 * view; it is just a hint to the system that this is not the primary 7116 * purpose of this view. 7117 * 7118 * @return Returns true if this view is a text editor, else false. 7119 */ 7120 public boolean onCheckIsTextEditor() { 7121 return false; 7122 } 7123 7124 /** 7125 * Create a new InputConnection for an InputMethod to interact 7126 * with the view. The default implementation returns null, since it doesn't 7127 * support input methods. You can override this to implement such support. 7128 * This is only needed for views that take focus and text input. 7129 * 7130 * <p>When implementing this, you probably also want to implement 7131 * {@link #onCheckIsTextEditor()} to indicate you will return a 7132 * non-null InputConnection. 7133 * 7134 * @param outAttrs Fill in with attribute information about the connection. 7135 */ 7136 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7137 return null; 7138 } 7139 7140 /** 7141 * Called by the {@link android.view.inputmethod.InputMethodManager} 7142 * when a view who is not the current 7143 * input connection target is trying to make a call on the manager. The 7144 * default implementation returns false; you can override this to return 7145 * true for certain views if you are performing InputConnection proxying 7146 * to them. 7147 * @param view The View that is making the InputMethodManager call. 7148 * @return Return true to allow the call, false to reject. 7149 */ 7150 public boolean checkInputConnectionProxy(View view) { 7151 return false; 7152 } 7153 7154 /** 7155 * Show the context menu for this view. It is not safe to hold on to the 7156 * menu after returning from this method. 7157 * 7158 * You should normally not overload this method. Overload 7159 * {@link #onCreateContextMenu(ContextMenu)} or define an 7160 * {@link OnCreateContextMenuListener} to add items to the context menu. 7161 * 7162 * @param menu The context menu to populate 7163 */ 7164 public void createContextMenu(ContextMenu menu) { 7165 ContextMenuInfo menuInfo = getContextMenuInfo(); 7166 7167 // Sets the current menu info so all items added to menu will have 7168 // my extra info set. 7169 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7170 7171 onCreateContextMenu(menu); 7172 ListenerInfo li = mListenerInfo; 7173 if (li != null && li.mOnCreateContextMenuListener != null) { 7174 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7175 } 7176 7177 // Clear the extra information so subsequent items that aren't mine don't 7178 // have my extra info. 7179 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7180 7181 if (mParent != null) { 7182 mParent.createContextMenu(menu); 7183 } 7184 } 7185 7186 /** 7187 * Views should implement this if they have extra information to associate 7188 * with the context menu. The return result is supplied as a parameter to 7189 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7190 * callback. 7191 * 7192 * @return Extra information about the item for which the context menu 7193 * should be shown. This information will vary across different 7194 * subclasses of View. 7195 */ 7196 protected ContextMenuInfo getContextMenuInfo() { 7197 return null; 7198 } 7199 7200 /** 7201 * Views should implement this if the view itself is going to add items to 7202 * the context menu. 7203 * 7204 * @param menu the context menu to populate 7205 */ 7206 protected void onCreateContextMenu(ContextMenu menu) { 7207 } 7208 7209 /** 7210 * Implement this method to handle trackball motion events. The 7211 * <em>relative</em> movement of the trackball since the last event 7212 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7213 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7214 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7215 * they will often be fractional values, representing the more fine-grained 7216 * movement information available from a trackball). 7217 * 7218 * @param event The motion event. 7219 * @return True if the event was handled, false otherwise. 7220 */ 7221 public boolean onTrackballEvent(MotionEvent event) { 7222 return false; 7223 } 7224 7225 /** 7226 * Implement this method to handle generic motion events. 7227 * <p> 7228 * Generic motion events describe joystick movements, mouse hovers, track pad 7229 * touches, scroll wheel movements and other input events. The 7230 * {@link MotionEvent#getSource() source} of the motion event specifies 7231 * the class of input that was received. Implementations of this method 7232 * must examine the bits in the source before processing the event. 7233 * The following code example shows how this is done. 7234 * </p><p> 7235 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7236 * are delivered to the view under the pointer. All other generic motion events are 7237 * delivered to the focused view. 7238 * </p> 7239 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7240 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7241 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7242 * // process the joystick movement... 7243 * return true; 7244 * } 7245 * } 7246 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7247 * switch (event.getAction()) { 7248 * case MotionEvent.ACTION_HOVER_MOVE: 7249 * // process the mouse hover movement... 7250 * return true; 7251 * case MotionEvent.ACTION_SCROLL: 7252 * // process the scroll wheel movement... 7253 * return true; 7254 * } 7255 * } 7256 * return super.onGenericMotionEvent(event); 7257 * }</pre> 7258 * 7259 * @param event The generic motion event being processed. 7260 * @return True if the event was handled, false otherwise. 7261 */ 7262 public boolean onGenericMotionEvent(MotionEvent event) { 7263 return false; 7264 } 7265 7266 /** 7267 * Implement this method to handle hover events. 7268 * <p> 7269 * This method is called whenever a pointer is hovering into, over, or out of the 7270 * bounds of a view and the view is not currently being touched. 7271 * Hover events are represented as pointer events with action 7272 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7273 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7274 * </p> 7275 * <ul> 7276 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7277 * when the pointer enters the bounds of the view.</li> 7278 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7279 * when the pointer has already entered the bounds of the view and has moved.</li> 7280 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7281 * when the pointer has exited the bounds of the view or when the pointer is 7282 * about to go down due to a button click, tap, or similar user action that 7283 * causes the view to be touched.</li> 7284 * </ul> 7285 * <p> 7286 * The view should implement this method to return true to indicate that it is 7287 * handling the hover event, such as by changing its drawable state. 7288 * </p><p> 7289 * The default implementation calls {@link #setHovered} to update the hovered state 7290 * of the view when a hover enter or hover exit event is received, if the view 7291 * is enabled and is clickable. The default implementation also sends hover 7292 * accessibility events. 7293 * </p> 7294 * 7295 * @param event The motion event that describes the hover. 7296 * @return True if the view handled the hover event. 7297 * 7298 * @see #isHovered 7299 * @see #setHovered 7300 * @see #onHoverChanged 7301 */ 7302 public boolean onHoverEvent(MotionEvent event) { 7303 // The root view may receive hover (or touch) events that are outside the bounds of 7304 // the window. This code ensures that we only send accessibility events for 7305 // hovers that are actually within the bounds of the root view. 7306 final int action = event.getActionMasked(); 7307 if (!mSendingHoverAccessibilityEvents) { 7308 if ((action == MotionEvent.ACTION_HOVER_ENTER 7309 || action == MotionEvent.ACTION_HOVER_MOVE) 7310 && !hasHoveredChild() 7311 && pointInView(event.getX(), event.getY())) { 7312 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7313 mSendingHoverAccessibilityEvents = true; 7314 requestAccessibilityFocusFromHover((int) event.getX(), (int) event.getY()); 7315 } 7316 } else { 7317 if (action == MotionEvent.ACTION_HOVER_EXIT 7318 || (action == MotionEvent.ACTION_MOVE 7319 && !pointInView(event.getX(), event.getY()))) { 7320 mSendingHoverAccessibilityEvents = false; 7321 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7322 // If the window does not have input focus we take away accessibility 7323 // focus as soon as the user stop hovering over the view. 7324 if (!mAttachInfo.mHasWindowFocus) { 7325 getViewRootImpl().setAccessibilityFocusedHost(null); 7326 } 7327 } 7328 } 7329 7330 if (isHoverable()) { 7331 switch (action) { 7332 case MotionEvent.ACTION_HOVER_ENTER: 7333 setHovered(true); 7334 break; 7335 case MotionEvent.ACTION_HOVER_EXIT: 7336 setHovered(false); 7337 break; 7338 } 7339 7340 // Dispatch the event to onGenericMotionEvent before returning true. 7341 // This is to provide compatibility with existing applications that 7342 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7343 // break because of the new default handling for hoverable views 7344 // in onHoverEvent. 7345 // Note that onGenericMotionEvent will be called by default when 7346 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7347 dispatchGenericMotionEventInternal(event); 7348 return true; 7349 } 7350 7351 return false; 7352 } 7353 7354 /** 7355 * Returns true if the view should handle {@link #onHoverEvent} 7356 * by calling {@link #setHovered} to change its hovered state. 7357 * 7358 * @return True if the view is hoverable. 7359 */ 7360 private boolean isHoverable() { 7361 final int viewFlags = mViewFlags; 7362 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7363 return false; 7364 } 7365 7366 return (viewFlags & CLICKABLE) == CLICKABLE 7367 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7368 } 7369 7370 /** 7371 * Returns true if the view is currently hovered. 7372 * 7373 * @return True if the view is currently hovered. 7374 * 7375 * @see #setHovered 7376 * @see #onHoverChanged 7377 */ 7378 @ViewDebug.ExportedProperty 7379 public boolean isHovered() { 7380 return (mPrivateFlags & HOVERED) != 0; 7381 } 7382 7383 /** 7384 * Sets whether the view is currently hovered. 7385 * <p> 7386 * Calling this method also changes the drawable state of the view. This 7387 * enables the view to react to hover by using different drawable resources 7388 * to change its appearance. 7389 * </p><p> 7390 * The {@link #onHoverChanged} method is called when the hovered state changes. 7391 * </p> 7392 * 7393 * @param hovered True if the view is hovered. 7394 * 7395 * @see #isHovered 7396 * @see #onHoverChanged 7397 */ 7398 public void setHovered(boolean hovered) { 7399 if (hovered) { 7400 if ((mPrivateFlags & HOVERED) == 0) { 7401 mPrivateFlags |= HOVERED; 7402 refreshDrawableState(); 7403 onHoverChanged(true); 7404 } 7405 } else { 7406 if ((mPrivateFlags & HOVERED) != 0) { 7407 mPrivateFlags &= ~HOVERED; 7408 refreshDrawableState(); 7409 onHoverChanged(false); 7410 } 7411 } 7412 } 7413 7414 /** 7415 * Implement this method to handle hover state changes. 7416 * <p> 7417 * This method is called whenever the hover state changes as a result of a 7418 * call to {@link #setHovered}. 7419 * </p> 7420 * 7421 * @param hovered The current hover state, as returned by {@link #isHovered}. 7422 * 7423 * @see #isHovered 7424 * @see #setHovered 7425 */ 7426 public void onHoverChanged(boolean hovered) { 7427 } 7428 7429 /** 7430 * Implement this method to handle touch screen motion events. 7431 * 7432 * @param event The motion event. 7433 * @return True if the event was handled, false otherwise. 7434 */ 7435 public boolean onTouchEvent(MotionEvent event) { 7436 final int viewFlags = mViewFlags; 7437 7438 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7439 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7440 setPressed(false); 7441 } 7442 // A disabled view that is clickable still consumes the touch 7443 // events, it just doesn't respond to them. 7444 return (((viewFlags & CLICKABLE) == CLICKABLE || 7445 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7446 } 7447 7448 if (mTouchDelegate != null) { 7449 if (mTouchDelegate.onTouchEvent(event)) { 7450 return true; 7451 } 7452 } 7453 7454 if (((viewFlags & CLICKABLE) == CLICKABLE || 7455 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7456 switch (event.getAction()) { 7457 case MotionEvent.ACTION_UP: 7458 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7459 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7460 // take focus if we don't have it already and we should in 7461 // touch mode. 7462 boolean focusTaken = false; 7463 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7464 focusTaken = requestFocus(); 7465 } 7466 7467 if (prepressed) { 7468 // The button is being released before we actually 7469 // showed it as pressed. Make it show the pressed 7470 // state now (before scheduling the click) to ensure 7471 // the user sees it. 7472 setPressed(true); 7473 } 7474 7475 if (!mHasPerformedLongPress) { 7476 // This is a tap, so remove the longpress check 7477 removeLongPressCallback(); 7478 7479 // Only perform take click actions if we were in the pressed state 7480 if (!focusTaken) { 7481 // Use a Runnable and post this rather than calling 7482 // performClick directly. This lets other visual state 7483 // of the view update before click actions start. 7484 if (mPerformClick == null) { 7485 mPerformClick = new PerformClick(); 7486 } 7487 if (!post(mPerformClick)) { 7488 performClick(); 7489 } 7490 } 7491 } 7492 7493 if (mUnsetPressedState == null) { 7494 mUnsetPressedState = new UnsetPressedState(); 7495 } 7496 7497 if (prepressed) { 7498 postDelayed(mUnsetPressedState, 7499 ViewConfiguration.getPressedStateDuration()); 7500 } else if (!post(mUnsetPressedState)) { 7501 // If the post failed, unpress right now 7502 mUnsetPressedState.run(); 7503 } 7504 removeTapCallback(); 7505 } 7506 break; 7507 7508 case MotionEvent.ACTION_DOWN: 7509 mHasPerformedLongPress = false; 7510 7511 if (performButtonActionOnTouchDown(event)) { 7512 break; 7513 } 7514 7515 // Walk up the hierarchy to determine if we're inside a scrolling container. 7516 boolean isInScrollingContainer = isInScrollingContainer(); 7517 7518 // For views inside a scrolling container, delay the pressed feedback for 7519 // a short period in case this is a scroll. 7520 if (isInScrollingContainer) { 7521 mPrivateFlags |= PREPRESSED; 7522 if (mPendingCheckForTap == null) { 7523 mPendingCheckForTap = new CheckForTap(); 7524 } 7525 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7526 } else { 7527 // Not inside a scrolling container, so show the feedback right away 7528 setPressed(true); 7529 checkForLongClick(0); 7530 } 7531 break; 7532 7533 case MotionEvent.ACTION_CANCEL: 7534 setPressed(false); 7535 removeTapCallback(); 7536 break; 7537 7538 case MotionEvent.ACTION_MOVE: 7539 final int x = (int) event.getX(); 7540 final int y = (int) event.getY(); 7541 7542 // Be lenient about moving outside of buttons 7543 if (!pointInView(x, y, mTouchSlop)) { 7544 // Outside button 7545 removeTapCallback(); 7546 if ((mPrivateFlags & PRESSED) != 0) { 7547 // Remove any future long press/tap checks 7548 removeLongPressCallback(); 7549 7550 setPressed(false); 7551 } 7552 } 7553 break; 7554 } 7555 return true; 7556 } 7557 7558 return false; 7559 } 7560 7561 /** 7562 * @hide 7563 */ 7564 public boolean isInScrollingContainer() { 7565 ViewParent p = getParent(); 7566 while (p != null && p instanceof ViewGroup) { 7567 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7568 return true; 7569 } 7570 p = p.getParent(); 7571 } 7572 return false; 7573 } 7574 7575 /** 7576 * Remove the longpress detection timer. 7577 */ 7578 private void removeLongPressCallback() { 7579 if (mPendingCheckForLongPress != null) { 7580 removeCallbacks(mPendingCheckForLongPress); 7581 } 7582 } 7583 7584 /** 7585 * Remove the pending click action 7586 */ 7587 private void removePerformClickCallback() { 7588 if (mPerformClick != null) { 7589 removeCallbacks(mPerformClick); 7590 } 7591 } 7592 7593 /** 7594 * Remove the prepress detection timer. 7595 */ 7596 private void removeUnsetPressCallback() { 7597 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7598 setPressed(false); 7599 removeCallbacks(mUnsetPressedState); 7600 } 7601 } 7602 7603 /** 7604 * Remove the tap detection timer. 7605 */ 7606 private void removeTapCallback() { 7607 if (mPendingCheckForTap != null) { 7608 mPrivateFlags &= ~PREPRESSED; 7609 removeCallbacks(mPendingCheckForTap); 7610 } 7611 } 7612 7613 /** 7614 * Cancels a pending long press. Your subclass can use this if you 7615 * want the context menu to come up if the user presses and holds 7616 * at the same place, but you don't want it to come up if they press 7617 * and then move around enough to cause scrolling. 7618 */ 7619 public void cancelLongPress() { 7620 removeLongPressCallback(); 7621 7622 /* 7623 * The prepressed state handled by the tap callback is a display 7624 * construct, but the tap callback will post a long press callback 7625 * less its own timeout. Remove it here. 7626 */ 7627 removeTapCallback(); 7628 } 7629 7630 /** 7631 * Remove the pending callback for sending a 7632 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 7633 */ 7634 private void removeSendViewScrolledAccessibilityEventCallback() { 7635 if (mSendViewScrolledAccessibilityEvent != null) { 7636 removeCallbacks(mSendViewScrolledAccessibilityEvent); 7637 } 7638 } 7639 7640 /** 7641 * Sets the TouchDelegate for this View. 7642 */ 7643 public void setTouchDelegate(TouchDelegate delegate) { 7644 mTouchDelegate = delegate; 7645 } 7646 7647 /** 7648 * Gets the TouchDelegate for this View. 7649 */ 7650 public TouchDelegate getTouchDelegate() { 7651 return mTouchDelegate; 7652 } 7653 7654 /** 7655 * Set flags controlling behavior of this view. 7656 * 7657 * @param flags Constant indicating the value which should be set 7658 * @param mask Constant indicating the bit range that should be changed 7659 */ 7660 void setFlags(int flags, int mask) { 7661 int old = mViewFlags; 7662 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 7663 7664 int changed = mViewFlags ^ old; 7665 if (changed == 0) { 7666 return; 7667 } 7668 int privateFlags = mPrivateFlags; 7669 7670 /* Check if the FOCUSABLE bit has changed */ 7671 if (((changed & FOCUSABLE_MASK) != 0) && 7672 ((privateFlags & HAS_BOUNDS) !=0)) { 7673 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 7674 && ((privateFlags & FOCUSED) != 0)) { 7675 /* Give up focus if we are no longer focusable */ 7676 clearFocus(); 7677 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 7678 && ((privateFlags & FOCUSED) == 0)) { 7679 /* 7680 * Tell the view system that we are now available to take focus 7681 * if no one else already has it. 7682 */ 7683 if (mParent != null) mParent.focusableViewAvailable(this); 7684 } 7685 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 7686 notifyAccessibilityStateChanged(); 7687 } 7688 } 7689 7690 if ((flags & VISIBILITY_MASK) == VISIBLE) { 7691 if ((changed & VISIBILITY_MASK) != 0) { 7692 /* 7693 * If this view is becoming visible, invalidate it in case it changed while 7694 * it was not visible. Marking it drawn ensures that the invalidation will 7695 * go through. 7696 */ 7697 mPrivateFlags |= DRAWN; 7698 invalidate(true); 7699 7700 needGlobalAttributesUpdate(true); 7701 7702 // a view becoming visible is worth notifying the parent 7703 // about in case nothing has focus. even if this specific view 7704 // isn't focusable, it may contain something that is, so let 7705 // the root view try to give this focus if nothing else does. 7706 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 7707 mParent.focusableViewAvailable(this); 7708 } 7709 } 7710 } 7711 7712 /* Check if the GONE bit has changed */ 7713 if ((changed & GONE) != 0) { 7714 needGlobalAttributesUpdate(false); 7715 requestLayout(); 7716 7717 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 7718 if (hasFocus()) clearFocus(); 7719 clearAccessibilityFocus(); 7720 destroyDrawingCache(); 7721 if (mParent instanceof View) { 7722 // GONE views noop invalidation, so invalidate the parent 7723 ((View) mParent).invalidate(true); 7724 } 7725 // Mark the view drawn to ensure that it gets invalidated properly the next 7726 // time it is visible and gets invalidated 7727 mPrivateFlags |= DRAWN; 7728 } 7729 if (mAttachInfo != null) { 7730 mAttachInfo.mViewVisibilityChanged = true; 7731 } 7732 } 7733 7734 /* Check if the VISIBLE bit has changed */ 7735 if ((changed & INVISIBLE) != 0) { 7736 needGlobalAttributesUpdate(false); 7737 /* 7738 * If this view is becoming invisible, set the DRAWN flag so that 7739 * the next invalidate() will not be skipped. 7740 */ 7741 mPrivateFlags |= DRAWN; 7742 7743 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 7744 // root view becoming invisible shouldn't clear focus and accessibility focus 7745 if (getRootView() != this) { 7746 clearFocus(); 7747 clearAccessibilityFocus(); 7748 } 7749 } 7750 if (mAttachInfo != null) { 7751 mAttachInfo.mViewVisibilityChanged = true; 7752 } 7753 } 7754 7755 if ((changed & VISIBILITY_MASK) != 0) { 7756 if (mParent instanceof ViewGroup) { 7757 ((ViewGroup) mParent).onChildVisibilityChanged(this, 7758 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 7759 ((View) mParent).invalidate(true); 7760 } else if (mParent != null) { 7761 mParent.invalidateChild(this, null); 7762 } 7763 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 7764 } 7765 7766 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 7767 destroyDrawingCache(); 7768 } 7769 7770 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 7771 destroyDrawingCache(); 7772 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7773 invalidateParentCaches(); 7774 } 7775 7776 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 7777 destroyDrawingCache(); 7778 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7779 } 7780 7781 if ((changed & DRAW_MASK) != 0) { 7782 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 7783 if (mBackground != null) { 7784 mPrivateFlags &= ~SKIP_DRAW; 7785 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 7786 } else { 7787 mPrivateFlags |= SKIP_DRAW; 7788 } 7789 } else { 7790 mPrivateFlags &= ~SKIP_DRAW; 7791 } 7792 requestLayout(); 7793 invalidate(true); 7794 } 7795 7796 if ((changed & KEEP_SCREEN_ON) != 0) { 7797 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 7798 mParent.recomputeViewAttributes(this); 7799 } 7800 } 7801 7802 if (AccessibilityManager.getInstance(mContext).isEnabled() 7803 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 7804 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 7805 notifyAccessibilityStateChanged(); 7806 } 7807 } 7808 7809 /** 7810 * Change the view's z order in the tree, so it's on top of other sibling 7811 * views 7812 */ 7813 public void bringToFront() { 7814 if (mParent != null) { 7815 mParent.bringChildToFront(this); 7816 } 7817 } 7818 7819 /** 7820 * This is called in response to an internal scroll in this view (i.e., the 7821 * view scrolled its own contents). This is typically as a result of 7822 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 7823 * called. 7824 * 7825 * @param l Current horizontal scroll origin. 7826 * @param t Current vertical scroll origin. 7827 * @param oldl Previous horizontal scroll origin. 7828 * @param oldt Previous vertical scroll origin. 7829 */ 7830 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 7831 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 7832 postSendViewScrolledAccessibilityEventCallback(); 7833 } 7834 7835 mBackgroundSizeChanged = true; 7836 7837 final AttachInfo ai = mAttachInfo; 7838 if (ai != null) { 7839 ai.mViewScrollChanged = true; 7840 } 7841 } 7842 7843 /** 7844 * Interface definition for a callback to be invoked when the layout bounds of a view 7845 * changes due to layout processing. 7846 */ 7847 public interface OnLayoutChangeListener { 7848 /** 7849 * Called when the focus state of a view has changed. 7850 * 7851 * @param v The view whose state has changed. 7852 * @param left The new value of the view's left property. 7853 * @param top The new value of the view's top property. 7854 * @param right The new value of the view's right property. 7855 * @param bottom The new value of the view's bottom property. 7856 * @param oldLeft The previous value of the view's left property. 7857 * @param oldTop The previous value of the view's top property. 7858 * @param oldRight The previous value of the view's right property. 7859 * @param oldBottom The previous value of the view's bottom property. 7860 */ 7861 void onLayoutChange(View v, int left, int top, int right, int bottom, 7862 int oldLeft, int oldTop, int oldRight, int oldBottom); 7863 } 7864 7865 /** 7866 * This is called during layout when the size of this view has changed. If 7867 * you were just added to the view hierarchy, you're called with the old 7868 * values of 0. 7869 * 7870 * @param w Current width of this view. 7871 * @param h Current height of this view. 7872 * @param oldw Old width of this view. 7873 * @param oldh Old height of this view. 7874 */ 7875 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 7876 } 7877 7878 /** 7879 * Called by draw to draw the child views. This may be overridden 7880 * by derived classes to gain control just before its children are drawn 7881 * (but after its own view has been drawn). 7882 * @param canvas the canvas on which to draw the view 7883 */ 7884 protected void dispatchDraw(Canvas canvas) { 7885 7886 } 7887 7888 /** 7889 * Gets the parent of this view. Note that the parent is a 7890 * ViewParent and not necessarily a View. 7891 * 7892 * @return Parent of this view. 7893 */ 7894 public final ViewParent getParent() { 7895 return mParent; 7896 } 7897 7898 /** 7899 * Set the horizontal scrolled position of your view. This will cause a call to 7900 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7901 * invalidated. 7902 * @param value the x position to scroll to 7903 */ 7904 public void setScrollX(int value) { 7905 scrollTo(value, mScrollY); 7906 } 7907 7908 /** 7909 * Set the vertical scrolled position of your view. This will cause a call to 7910 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7911 * invalidated. 7912 * @param value the y position to scroll to 7913 */ 7914 public void setScrollY(int value) { 7915 scrollTo(mScrollX, value); 7916 } 7917 7918 /** 7919 * Return the scrolled left position of this view. This is the left edge of 7920 * the displayed part of your view. You do not need to draw any pixels 7921 * farther left, since those are outside of the frame of your view on 7922 * screen. 7923 * 7924 * @return The left edge of the displayed part of your view, in pixels. 7925 */ 7926 public final int getScrollX() { 7927 return mScrollX; 7928 } 7929 7930 /** 7931 * Return the scrolled top position of this view. This is the top edge of 7932 * the displayed part of your view. You do not need to draw any pixels above 7933 * it, since those are outside of the frame of your view on screen. 7934 * 7935 * @return The top edge of the displayed part of your view, in pixels. 7936 */ 7937 public final int getScrollY() { 7938 return mScrollY; 7939 } 7940 7941 /** 7942 * Return the width of the your view. 7943 * 7944 * @return The width of your view, in pixels. 7945 */ 7946 @ViewDebug.ExportedProperty(category = "layout") 7947 public final int getWidth() { 7948 return mRight - mLeft; 7949 } 7950 7951 /** 7952 * Return the height of your view. 7953 * 7954 * @return The height of your view, in pixels. 7955 */ 7956 @ViewDebug.ExportedProperty(category = "layout") 7957 public final int getHeight() { 7958 return mBottom - mTop; 7959 } 7960 7961 /** 7962 * Return the visible drawing bounds of your view. Fills in the output 7963 * rectangle with the values from getScrollX(), getScrollY(), 7964 * getWidth(), and getHeight(). 7965 * 7966 * @param outRect The (scrolled) drawing bounds of the view. 7967 */ 7968 public void getDrawingRect(Rect outRect) { 7969 outRect.left = mScrollX; 7970 outRect.top = mScrollY; 7971 outRect.right = mScrollX + (mRight - mLeft); 7972 outRect.bottom = mScrollY + (mBottom - mTop); 7973 } 7974 7975 /** 7976 * Like {@link #getMeasuredWidthAndState()}, but only returns the 7977 * raw width component (that is the result is masked by 7978 * {@link #MEASURED_SIZE_MASK}). 7979 * 7980 * @return The raw measured width of this view. 7981 */ 7982 public final int getMeasuredWidth() { 7983 return mMeasuredWidth & MEASURED_SIZE_MASK; 7984 } 7985 7986 /** 7987 * Return the full width measurement information for this view as computed 7988 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 7989 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 7990 * This should be used during measurement and layout calculations only. Use 7991 * {@link #getWidth()} to see how wide a view is after layout. 7992 * 7993 * @return The measured width of this view as a bit mask. 7994 */ 7995 public final int getMeasuredWidthAndState() { 7996 return mMeasuredWidth; 7997 } 7998 7999 /** 8000 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8001 * raw width component (that is the result is masked by 8002 * {@link #MEASURED_SIZE_MASK}). 8003 * 8004 * @return The raw measured height of this view. 8005 */ 8006 public final int getMeasuredHeight() { 8007 return mMeasuredHeight & MEASURED_SIZE_MASK; 8008 } 8009 8010 /** 8011 * Return the full height measurement information for this view as computed 8012 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8013 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8014 * This should be used during measurement and layout calculations only. Use 8015 * {@link #getHeight()} to see how wide a view is after layout. 8016 * 8017 * @return The measured width of this view as a bit mask. 8018 */ 8019 public final int getMeasuredHeightAndState() { 8020 return mMeasuredHeight; 8021 } 8022 8023 /** 8024 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8025 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8026 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8027 * and the height component is at the shifted bits 8028 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8029 */ 8030 public final int getMeasuredState() { 8031 return (mMeasuredWidth&MEASURED_STATE_MASK) 8032 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8033 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8034 } 8035 8036 /** 8037 * The transform matrix of this view, which is calculated based on the current 8038 * roation, scale, and pivot properties. 8039 * 8040 * @see #getRotation() 8041 * @see #getScaleX() 8042 * @see #getScaleY() 8043 * @see #getPivotX() 8044 * @see #getPivotY() 8045 * @return The current transform matrix for the view 8046 */ 8047 public Matrix getMatrix() { 8048 if (mTransformationInfo != null) { 8049 updateMatrix(); 8050 return mTransformationInfo.mMatrix; 8051 } 8052 return Matrix.IDENTITY_MATRIX; 8053 } 8054 8055 /** 8056 * Utility function to determine if the value is far enough away from zero to be 8057 * considered non-zero. 8058 * @param value A floating point value to check for zero-ness 8059 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8060 */ 8061 private static boolean nonzero(float value) { 8062 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8063 } 8064 8065 /** 8066 * Returns true if the transform matrix is the identity matrix. 8067 * Recomputes the matrix if necessary. 8068 * 8069 * @return True if the transform matrix is the identity matrix, false otherwise. 8070 */ 8071 final boolean hasIdentityMatrix() { 8072 if (mTransformationInfo != null) { 8073 updateMatrix(); 8074 return mTransformationInfo.mMatrixIsIdentity; 8075 } 8076 return true; 8077 } 8078 8079 void ensureTransformationInfo() { 8080 if (mTransformationInfo == null) { 8081 mTransformationInfo = new TransformationInfo(); 8082 } 8083 } 8084 8085 /** 8086 * Recomputes the transform matrix if necessary. 8087 */ 8088 private void updateMatrix() { 8089 final TransformationInfo info = mTransformationInfo; 8090 if (info == null) { 8091 return; 8092 } 8093 if (info.mMatrixDirty) { 8094 // transform-related properties have changed since the last time someone 8095 // asked for the matrix; recalculate it with the current values 8096 8097 // Figure out if we need to update the pivot point 8098 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8099 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8100 info.mPrevWidth = mRight - mLeft; 8101 info.mPrevHeight = mBottom - mTop; 8102 info.mPivotX = info.mPrevWidth / 2f; 8103 info.mPivotY = info.mPrevHeight / 2f; 8104 } 8105 } 8106 info.mMatrix.reset(); 8107 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8108 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8109 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8110 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8111 } else { 8112 if (info.mCamera == null) { 8113 info.mCamera = new Camera(); 8114 info.matrix3D = new Matrix(); 8115 } 8116 info.mCamera.save(); 8117 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8118 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8119 info.mCamera.getMatrix(info.matrix3D); 8120 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8121 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8122 info.mPivotY + info.mTranslationY); 8123 info.mMatrix.postConcat(info.matrix3D); 8124 info.mCamera.restore(); 8125 } 8126 info.mMatrixDirty = false; 8127 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8128 info.mInverseMatrixDirty = true; 8129 } 8130 } 8131 8132 /** 8133 * Utility method to retrieve the inverse of the current mMatrix property. 8134 * We cache the matrix to avoid recalculating it when transform properties 8135 * have not changed. 8136 * 8137 * @return The inverse of the current matrix of this view. 8138 */ 8139 final Matrix getInverseMatrix() { 8140 final TransformationInfo info = mTransformationInfo; 8141 if (info != null) { 8142 updateMatrix(); 8143 if (info.mInverseMatrixDirty) { 8144 if (info.mInverseMatrix == null) { 8145 info.mInverseMatrix = new Matrix(); 8146 } 8147 info.mMatrix.invert(info.mInverseMatrix); 8148 info.mInverseMatrixDirty = false; 8149 } 8150 return info.mInverseMatrix; 8151 } 8152 return Matrix.IDENTITY_MATRIX; 8153 } 8154 8155 /** 8156 * Gets the distance along the Z axis from the camera to this view. 8157 * 8158 * @see #setCameraDistance(float) 8159 * 8160 * @return The distance along the Z axis. 8161 */ 8162 public float getCameraDistance() { 8163 ensureTransformationInfo(); 8164 final float dpi = mResources.getDisplayMetrics().densityDpi; 8165 final TransformationInfo info = mTransformationInfo; 8166 if (info.mCamera == null) { 8167 info.mCamera = new Camera(); 8168 info.matrix3D = new Matrix(); 8169 } 8170 return -(info.mCamera.getLocationZ() * dpi); 8171 } 8172 8173 /** 8174 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8175 * views are drawn) from the camera to this view. The camera's distance 8176 * affects 3D transformations, for instance rotations around the X and Y 8177 * axis. If the rotationX or rotationY properties are changed and this view is 8178 * large (more than half the size of the screen), it is recommended to always 8179 * use a camera distance that's greater than the height (X axis rotation) or 8180 * the width (Y axis rotation) of this view.</p> 8181 * 8182 * <p>The distance of the camera from the view plane can have an affect on the 8183 * perspective distortion of the view when it is rotated around the x or y axis. 8184 * For example, a large distance will result in a large viewing angle, and there 8185 * will not be much perspective distortion of the view as it rotates. A short 8186 * distance may cause much more perspective distortion upon rotation, and can 8187 * also result in some drawing artifacts if the rotated view ends up partially 8188 * behind the camera (which is why the recommendation is to use a distance at 8189 * least as far as the size of the view, if the view is to be rotated.)</p> 8190 * 8191 * <p>The distance is expressed in "depth pixels." The default distance depends 8192 * on the screen density. For instance, on a medium density display, the 8193 * default distance is 1280. On a high density display, the default distance 8194 * is 1920.</p> 8195 * 8196 * <p>If you want to specify a distance that leads to visually consistent 8197 * results across various densities, use the following formula:</p> 8198 * <pre> 8199 * float scale = context.getResources().getDisplayMetrics().density; 8200 * view.setCameraDistance(distance * scale); 8201 * </pre> 8202 * 8203 * <p>The density scale factor of a high density display is 1.5, 8204 * and 1920 = 1280 * 1.5.</p> 8205 * 8206 * @param distance The distance in "depth pixels", if negative the opposite 8207 * value is used 8208 * 8209 * @see #setRotationX(float) 8210 * @see #setRotationY(float) 8211 */ 8212 public void setCameraDistance(float distance) { 8213 invalidateViewProperty(true, false); 8214 8215 ensureTransformationInfo(); 8216 final float dpi = mResources.getDisplayMetrics().densityDpi; 8217 final TransformationInfo info = mTransformationInfo; 8218 if (info.mCamera == null) { 8219 info.mCamera = new Camera(); 8220 info.matrix3D = new Matrix(); 8221 } 8222 8223 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8224 info.mMatrixDirty = true; 8225 8226 invalidateViewProperty(false, false); 8227 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8228 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8229 } 8230 } 8231 8232 /** 8233 * The degrees that the view is rotated around the pivot point. 8234 * 8235 * @see #setRotation(float) 8236 * @see #getPivotX() 8237 * @see #getPivotY() 8238 * 8239 * @return The degrees of rotation. 8240 */ 8241 @ViewDebug.ExportedProperty(category = "drawing") 8242 public float getRotation() { 8243 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8244 } 8245 8246 /** 8247 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8248 * result in clockwise rotation. 8249 * 8250 * @param rotation The degrees of rotation. 8251 * 8252 * @see #getRotation() 8253 * @see #getPivotX() 8254 * @see #getPivotY() 8255 * @see #setRotationX(float) 8256 * @see #setRotationY(float) 8257 * 8258 * @attr ref android.R.styleable#View_rotation 8259 */ 8260 public void setRotation(float rotation) { 8261 ensureTransformationInfo(); 8262 final TransformationInfo info = mTransformationInfo; 8263 if (info.mRotation != rotation) { 8264 // Double-invalidation is necessary to capture view's old and new areas 8265 invalidateViewProperty(true, false); 8266 info.mRotation = rotation; 8267 info.mMatrixDirty = true; 8268 invalidateViewProperty(false, true); 8269 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8270 mDisplayList.setRotation(rotation); 8271 } 8272 } 8273 } 8274 8275 /** 8276 * The degrees that the view is rotated around the vertical axis through the pivot point. 8277 * 8278 * @see #getPivotX() 8279 * @see #getPivotY() 8280 * @see #setRotationY(float) 8281 * 8282 * @return The degrees of Y rotation. 8283 */ 8284 @ViewDebug.ExportedProperty(category = "drawing") 8285 public float getRotationY() { 8286 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8287 } 8288 8289 /** 8290 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8291 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8292 * down the y axis. 8293 * 8294 * When rotating large views, it is recommended to adjust the camera distance 8295 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8296 * 8297 * @param rotationY The degrees of Y rotation. 8298 * 8299 * @see #getRotationY() 8300 * @see #getPivotX() 8301 * @see #getPivotY() 8302 * @see #setRotation(float) 8303 * @see #setRotationX(float) 8304 * @see #setCameraDistance(float) 8305 * 8306 * @attr ref android.R.styleable#View_rotationY 8307 */ 8308 public void setRotationY(float rotationY) { 8309 ensureTransformationInfo(); 8310 final TransformationInfo info = mTransformationInfo; 8311 if (info.mRotationY != rotationY) { 8312 invalidateViewProperty(true, false); 8313 info.mRotationY = rotationY; 8314 info.mMatrixDirty = true; 8315 invalidateViewProperty(false, true); 8316 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8317 mDisplayList.setRotationY(rotationY); 8318 } 8319 } 8320 } 8321 8322 /** 8323 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8324 * 8325 * @see #getPivotX() 8326 * @see #getPivotY() 8327 * @see #setRotationX(float) 8328 * 8329 * @return The degrees of X rotation. 8330 */ 8331 @ViewDebug.ExportedProperty(category = "drawing") 8332 public float getRotationX() { 8333 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8334 } 8335 8336 /** 8337 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8338 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8339 * x axis. 8340 * 8341 * When rotating large views, it is recommended to adjust the camera distance 8342 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8343 * 8344 * @param rotationX The degrees of X rotation. 8345 * 8346 * @see #getRotationX() 8347 * @see #getPivotX() 8348 * @see #getPivotY() 8349 * @see #setRotation(float) 8350 * @see #setRotationY(float) 8351 * @see #setCameraDistance(float) 8352 * 8353 * @attr ref android.R.styleable#View_rotationX 8354 */ 8355 public void setRotationX(float rotationX) { 8356 ensureTransformationInfo(); 8357 final TransformationInfo info = mTransformationInfo; 8358 if (info.mRotationX != rotationX) { 8359 invalidateViewProperty(true, false); 8360 info.mRotationX = rotationX; 8361 info.mMatrixDirty = true; 8362 invalidateViewProperty(false, true); 8363 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8364 mDisplayList.setRotationX(rotationX); 8365 } 8366 } 8367 } 8368 8369 /** 8370 * The amount that the view is scaled in x around the pivot point, as a proportion of 8371 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8372 * 8373 * <p>By default, this is 1.0f. 8374 * 8375 * @see #getPivotX() 8376 * @see #getPivotY() 8377 * @return The scaling factor. 8378 */ 8379 @ViewDebug.ExportedProperty(category = "drawing") 8380 public float getScaleX() { 8381 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8382 } 8383 8384 /** 8385 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8386 * the view's unscaled width. A value of 1 means that no scaling is applied. 8387 * 8388 * @param scaleX The scaling factor. 8389 * @see #getPivotX() 8390 * @see #getPivotY() 8391 * 8392 * @attr ref android.R.styleable#View_scaleX 8393 */ 8394 public void setScaleX(float scaleX) { 8395 ensureTransformationInfo(); 8396 final TransformationInfo info = mTransformationInfo; 8397 if (info.mScaleX != scaleX) { 8398 invalidateViewProperty(true, false); 8399 info.mScaleX = scaleX; 8400 info.mMatrixDirty = true; 8401 invalidateViewProperty(false, true); 8402 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8403 mDisplayList.setScaleX(scaleX); 8404 } 8405 } 8406 } 8407 8408 /** 8409 * The amount that the view is scaled in y around the pivot point, as a proportion of 8410 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8411 * 8412 * <p>By default, this is 1.0f. 8413 * 8414 * @see #getPivotX() 8415 * @see #getPivotY() 8416 * @return The scaling factor. 8417 */ 8418 @ViewDebug.ExportedProperty(category = "drawing") 8419 public float getScaleY() { 8420 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8421 } 8422 8423 /** 8424 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8425 * the view's unscaled width. A value of 1 means that no scaling is applied. 8426 * 8427 * @param scaleY The scaling factor. 8428 * @see #getPivotX() 8429 * @see #getPivotY() 8430 * 8431 * @attr ref android.R.styleable#View_scaleY 8432 */ 8433 public void setScaleY(float scaleY) { 8434 ensureTransformationInfo(); 8435 final TransformationInfo info = mTransformationInfo; 8436 if (info.mScaleY != scaleY) { 8437 invalidateViewProperty(true, false); 8438 info.mScaleY = scaleY; 8439 info.mMatrixDirty = true; 8440 invalidateViewProperty(false, true); 8441 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8442 mDisplayList.setScaleY(scaleY); 8443 } 8444 } 8445 } 8446 8447 /** 8448 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8449 * and {@link #setScaleX(float) scaled}. 8450 * 8451 * @see #getRotation() 8452 * @see #getScaleX() 8453 * @see #getScaleY() 8454 * @see #getPivotY() 8455 * @return The x location of the pivot point. 8456 * 8457 * @attr ref android.R.styleable#View_transformPivotX 8458 */ 8459 @ViewDebug.ExportedProperty(category = "drawing") 8460 public float getPivotX() { 8461 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8462 } 8463 8464 /** 8465 * Sets the x location of the point around which the view is 8466 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8467 * By default, the pivot point is centered on the object. 8468 * Setting this property disables this behavior and causes the view to use only the 8469 * explicitly set pivotX and pivotY values. 8470 * 8471 * @param pivotX The x location of the pivot point. 8472 * @see #getRotation() 8473 * @see #getScaleX() 8474 * @see #getScaleY() 8475 * @see #getPivotY() 8476 * 8477 * @attr ref android.R.styleable#View_transformPivotX 8478 */ 8479 public void setPivotX(float pivotX) { 8480 ensureTransformationInfo(); 8481 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8482 final TransformationInfo info = mTransformationInfo; 8483 if (info.mPivotX != pivotX) { 8484 invalidateViewProperty(true, false); 8485 info.mPivotX = pivotX; 8486 info.mMatrixDirty = true; 8487 invalidateViewProperty(false, true); 8488 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8489 mDisplayList.setPivotX(pivotX); 8490 } 8491 } 8492 } 8493 8494 /** 8495 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8496 * and {@link #setScaleY(float) scaled}. 8497 * 8498 * @see #getRotation() 8499 * @see #getScaleX() 8500 * @see #getScaleY() 8501 * @see #getPivotY() 8502 * @return The y location of the pivot point. 8503 * 8504 * @attr ref android.R.styleable#View_transformPivotY 8505 */ 8506 @ViewDebug.ExportedProperty(category = "drawing") 8507 public float getPivotY() { 8508 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8509 } 8510 8511 /** 8512 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8513 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8514 * Setting this property disables this behavior and causes the view to use only the 8515 * explicitly set pivotX and pivotY values. 8516 * 8517 * @param pivotY The y location of the pivot point. 8518 * @see #getRotation() 8519 * @see #getScaleX() 8520 * @see #getScaleY() 8521 * @see #getPivotY() 8522 * 8523 * @attr ref android.R.styleable#View_transformPivotY 8524 */ 8525 public void setPivotY(float pivotY) { 8526 ensureTransformationInfo(); 8527 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8528 final TransformationInfo info = mTransformationInfo; 8529 if (info.mPivotY != pivotY) { 8530 invalidateViewProperty(true, false); 8531 info.mPivotY = pivotY; 8532 info.mMatrixDirty = true; 8533 invalidateViewProperty(false, true); 8534 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8535 mDisplayList.setPivotY(pivotY); 8536 } 8537 } 8538 } 8539 8540 /** 8541 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8542 * completely transparent and 1 means the view is completely opaque. 8543 * 8544 * <p>By default this is 1.0f. 8545 * @return The opacity of the view. 8546 */ 8547 @ViewDebug.ExportedProperty(category = "drawing") 8548 public float getAlpha() { 8549 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8550 } 8551 8552 /** 8553 * Returns whether this View has content which overlaps. This function, intended to be 8554 * overridden by specific View types, is an optimization when alpha is set on a view. If 8555 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8556 * and then composited it into place, which can be expensive. If the view has no overlapping 8557 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8558 * An example of overlapping rendering is a TextView with a background image, such as a 8559 * Button. An example of non-overlapping rendering is a TextView with no background, or 8560 * an ImageView with only the foreground image. The default implementation returns true; 8561 * subclasses should override if they have cases which can be optimized. 8562 * 8563 * @return true if the content in this view might overlap, false otherwise. 8564 */ 8565 public boolean hasOverlappingRendering() { 8566 return true; 8567 } 8568 8569 /** 8570 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8571 * completely transparent and 1 means the view is completely opaque.</p> 8572 * 8573 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8574 * responsible for applying the opacity itself. Otherwise, calling this method is 8575 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8576 * setting a hardware layer.</p> 8577 * 8578 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8579 * performance implications. It is generally best to use the alpha property sparingly and 8580 * transiently, as in the case of fading animations.</p> 8581 * 8582 * @param alpha The opacity of the view. 8583 * 8584 * @see #setLayerType(int, android.graphics.Paint) 8585 * 8586 * @attr ref android.R.styleable#View_alpha 8587 */ 8588 public void setAlpha(float alpha) { 8589 ensureTransformationInfo(); 8590 if (mTransformationInfo.mAlpha != alpha) { 8591 mTransformationInfo.mAlpha = alpha; 8592 if (onSetAlpha((int) (alpha * 255))) { 8593 mPrivateFlags |= ALPHA_SET; 8594 // subclass is handling alpha - don't optimize rendering cache invalidation 8595 invalidateParentCaches(); 8596 invalidate(true); 8597 } else { 8598 mPrivateFlags &= ~ALPHA_SET; 8599 invalidateViewProperty(true, false); 8600 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8601 mDisplayList.setAlpha(alpha); 8602 } 8603 } 8604 } 8605 } 8606 8607 /** 8608 * Faster version of setAlpha() which performs the same steps except there are 8609 * no calls to invalidate(). The caller of this function should perform proper invalidation 8610 * on the parent and this object. The return value indicates whether the subclass handles 8611 * alpha (the return value for onSetAlpha()). 8612 * 8613 * @param alpha The new value for the alpha property 8614 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 8615 * the new value for the alpha property is different from the old value 8616 */ 8617 boolean setAlphaNoInvalidation(float alpha) { 8618 ensureTransformationInfo(); 8619 if (mTransformationInfo.mAlpha != alpha) { 8620 mTransformationInfo.mAlpha = alpha; 8621 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 8622 if (subclassHandlesAlpha) { 8623 mPrivateFlags |= ALPHA_SET; 8624 return true; 8625 } else { 8626 mPrivateFlags &= ~ALPHA_SET; 8627 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8628 mDisplayList.setAlpha(alpha); 8629 } 8630 } 8631 } 8632 return false; 8633 } 8634 8635 /** 8636 * Top position of this view relative to its parent. 8637 * 8638 * @return The top of this view, in pixels. 8639 */ 8640 @ViewDebug.CapturedViewProperty 8641 public final int getTop() { 8642 return mTop; 8643 } 8644 8645 /** 8646 * Sets the top position of this view relative to its parent. This method is meant to be called 8647 * by the layout system and should not generally be called otherwise, because the property 8648 * may be changed at any time by the layout. 8649 * 8650 * @param top The top of this view, in pixels. 8651 */ 8652 public final void setTop(int top) { 8653 if (top != mTop) { 8654 updateMatrix(); 8655 final boolean matrixIsIdentity = mTransformationInfo == null 8656 || mTransformationInfo.mMatrixIsIdentity; 8657 if (matrixIsIdentity) { 8658 if (mAttachInfo != null) { 8659 int minTop; 8660 int yLoc; 8661 if (top < mTop) { 8662 minTop = top; 8663 yLoc = top - mTop; 8664 } else { 8665 minTop = mTop; 8666 yLoc = 0; 8667 } 8668 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 8669 } 8670 } else { 8671 // Double-invalidation is necessary to capture view's old and new areas 8672 invalidate(true); 8673 } 8674 8675 int width = mRight - mLeft; 8676 int oldHeight = mBottom - mTop; 8677 8678 mTop = top; 8679 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8680 mDisplayList.setTop(mTop); 8681 } 8682 8683 onSizeChanged(width, mBottom - mTop, width, oldHeight); 8684 8685 if (!matrixIsIdentity) { 8686 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8687 // A change in dimension means an auto-centered pivot point changes, too 8688 mTransformationInfo.mMatrixDirty = true; 8689 } 8690 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8691 invalidate(true); 8692 } 8693 mBackgroundSizeChanged = true; 8694 invalidateParentIfNeeded(); 8695 } 8696 } 8697 8698 /** 8699 * Bottom position of this view relative to its parent. 8700 * 8701 * @return The bottom of this view, in pixels. 8702 */ 8703 @ViewDebug.CapturedViewProperty 8704 public final int getBottom() { 8705 return mBottom; 8706 } 8707 8708 /** 8709 * True if this view has changed since the last time being drawn. 8710 * 8711 * @return The dirty state of this view. 8712 */ 8713 public boolean isDirty() { 8714 return (mPrivateFlags & DIRTY_MASK) != 0; 8715 } 8716 8717 /** 8718 * Sets the bottom position of this view relative to its parent. This method is meant to be 8719 * called by the layout system and should not generally be called otherwise, because the 8720 * property may be changed at any time by the layout. 8721 * 8722 * @param bottom The bottom of this view, in pixels. 8723 */ 8724 public final void setBottom(int bottom) { 8725 if (bottom != mBottom) { 8726 updateMatrix(); 8727 final boolean matrixIsIdentity = mTransformationInfo == null 8728 || mTransformationInfo.mMatrixIsIdentity; 8729 if (matrixIsIdentity) { 8730 if (mAttachInfo != null) { 8731 int maxBottom; 8732 if (bottom < mBottom) { 8733 maxBottom = mBottom; 8734 } else { 8735 maxBottom = bottom; 8736 } 8737 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 8738 } 8739 } else { 8740 // Double-invalidation is necessary to capture view's old and new areas 8741 invalidate(true); 8742 } 8743 8744 int width = mRight - mLeft; 8745 int oldHeight = mBottom - mTop; 8746 8747 mBottom = bottom; 8748 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8749 mDisplayList.setBottom(mBottom); 8750 } 8751 8752 onSizeChanged(width, mBottom - mTop, width, oldHeight); 8753 8754 if (!matrixIsIdentity) { 8755 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8756 // A change in dimension means an auto-centered pivot point changes, too 8757 mTransformationInfo.mMatrixDirty = true; 8758 } 8759 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8760 invalidate(true); 8761 } 8762 mBackgroundSizeChanged = true; 8763 invalidateParentIfNeeded(); 8764 } 8765 } 8766 8767 /** 8768 * Left position of this view relative to its parent. 8769 * 8770 * @return The left edge of this view, in pixels. 8771 */ 8772 @ViewDebug.CapturedViewProperty 8773 public final int getLeft() { 8774 return mLeft; 8775 } 8776 8777 /** 8778 * Sets the left position of this view relative to its parent. This method is meant to be called 8779 * by the layout system and should not generally be called otherwise, because the property 8780 * may be changed at any time by the layout. 8781 * 8782 * @param left The bottom of this view, in pixels. 8783 */ 8784 public final void setLeft(int left) { 8785 if (left != mLeft) { 8786 updateMatrix(); 8787 final boolean matrixIsIdentity = mTransformationInfo == null 8788 || mTransformationInfo.mMatrixIsIdentity; 8789 if (matrixIsIdentity) { 8790 if (mAttachInfo != null) { 8791 int minLeft; 8792 int xLoc; 8793 if (left < mLeft) { 8794 minLeft = left; 8795 xLoc = left - mLeft; 8796 } else { 8797 minLeft = mLeft; 8798 xLoc = 0; 8799 } 8800 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 8801 } 8802 } else { 8803 // Double-invalidation is necessary to capture view's old and new areas 8804 invalidate(true); 8805 } 8806 8807 int oldWidth = mRight - mLeft; 8808 int height = mBottom - mTop; 8809 8810 mLeft = left; 8811 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8812 mDisplayList.setLeft(left); 8813 } 8814 8815 onSizeChanged(mRight - mLeft, height, oldWidth, height); 8816 8817 if (!matrixIsIdentity) { 8818 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8819 // A change in dimension means an auto-centered pivot point changes, too 8820 mTransformationInfo.mMatrixDirty = true; 8821 } 8822 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8823 invalidate(true); 8824 } 8825 mBackgroundSizeChanged = true; 8826 invalidateParentIfNeeded(); 8827 if (USE_DISPLAY_LIST_PROPERTIES) { 8828 8829 } 8830 } 8831 } 8832 8833 /** 8834 * Right position of this view relative to its parent. 8835 * 8836 * @return The right edge of this view, in pixels. 8837 */ 8838 @ViewDebug.CapturedViewProperty 8839 public final int getRight() { 8840 return mRight; 8841 } 8842 8843 /** 8844 * Sets the right position of this view relative to its parent. This method is meant to be called 8845 * by the layout system and should not generally be called otherwise, because the property 8846 * may be changed at any time by the layout. 8847 * 8848 * @param right The bottom of this view, in pixels. 8849 */ 8850 public final void setRight(int right) { 8851 if (right != mRight) { 8852 updateMatrix(); 8853 final boolean matrixIsIdentity = mTransformationInfo == null 8854 || mTransformationInfo.mMatrixIsIdentity; 8855 if (matrixIsIdentity) { 8856 if (mAttachInfo != null) { 8857 int maxRight; 8858 if (right < mRight) { 8859 maxRight = mRight; 8860 } else { 8861 maxRight = right; 8862 } 8863 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 8864 } 8865 } else { 8866 // Double-invalidation is necessary to capture view's old and new areas 8867 invalidate(true); 8868 } 8869 8870 int oldWidth = mRight - mLeft; 8871 int height = mBottom - mTop; 8872 8873 mRight = right; 8874 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8875 mDisplayList.setRight(mRight); 8876 } 8877 8878 onSizeChanged(mRight - mLeft, height, oldWidth, height); 8879 8880 if (!matrixIsIdentity) { 8881 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8882 // A change in dimension means an auto-centered pivot point changes, too 8883 mTransformationInfo.mMatrixDirty = true; 8884 } 8885 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8886 invalidate(true); 8887 } 8888 mBackgroundSizeChanged = true; 8889 invalidateParentIfNeeded(); 8890 } 8891 } 8892 8893 /** 8894 * The visual x position of this view, in pixels. This is equivalent to the 8895 * {@link #setTranslationX(float) translationX} property plus the current 8896 * {@link #getLeft() left} property. 8897 * 8898 * @return The visual x position of this view, in pixels. 8899 */ 8900 @ViewDebug.ExportedProperty(category = "drawing") 8901 public float getX() { 8902 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 8903 } 8904 8905 /** 8906 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 8907 * {@link #setTranslationX(float) translationX} property to be the difference between 8908 * the x value passed in and the current {@link #getLeft() left} property. 8909 * 8910 * @param x The visual x position of this view, in pixels. 8911 */ 8912 public void setX(float x) { 8913 setTranslationX(x - mLeft); 8914 } 8915 8916 /** 8917 * The visual y position of this view, in pixels. This is equivalent to the 8918 * {@link #setTranslationY(float) translationY} property plus the current 8919 * {@link #getTop() top} property. 8920 * 8921 * @return The visual y position of this view, in pixels. 8922 */ 8923 @ViewDebug.ExportedProperty(category = "drawing") 8924 public float getY() { 8925 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 8926 } 8927 8928 /** 8929 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 8930 * {@link #setTranslationY(float) translationY} property to be the difference between 8931 * the y value passed in and the current {@link #getTop() top} property. 8932 * 8933 * @param y The visual y position of this view, in pixels. 8934 */ 8935 public void setY(float y) { 8936 setTranslationY(y - mTop); 8937 } 8938 8939 8940 /** 8941 * The horizontal location of this view relative to its {@link #getLeft() left} position. 8942 * This position is post-layout, in addition to wherever the object's 8943 * layout placed it. 8944 * 8945 * @return The horizontal position of this view relative to its left position, in pixels. 8946 */ 8947 @ViewDebug.ExportedProperty(category = "drawing") 8948 public float getTranslationX() { 8949 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 8950 } 8951 8952 /** 8953 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 8954 * This effectively positions the object post-layout, in addition to wherever the object's 8955 * layout placed it. 8956 * 8957 * @param translationX The horizontal position of this view relative to its left position, 8958 * in pixels. 8959 * 8960 * @attr ref android.R.styleable#View_translationX 8961 */ 8962 public void setTranslationX(float translationX) { 8963 ensureTransformationInfo(); 8964 final TransformationInfo info = mTransformationInfo; 8965 if (info.mTranslationX != translationX) { 8966 // Double-invalidation is necessary to capture view's old and new areas 8967 invalidateViewProperty(true, false); 8968 info.mTranslationX = translationX; 8969 info.mMatrixDirty = true; 8970 invalidateViewProperty(false, true); 8971 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 8972 mDisplayList.setTranslationX(translationX); 8973 } 8974 } 8975 } 8976 8977 /** 8978 * The horizontal location of this view relative to its {@link #getTop() top} position. 8979 * This position is post-layout, in addition to wherever the object's 8980 * layout placed it. 8981 * 8982 * @return The vertical position of this view relative to its top position, 8983 * in pixels. 8984 */ 8985 @ViewDebug.ExportedProperty(category = "drawing") 8986 public float getTranslationY() { 8987 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 8988 } 8989 8990 /** 8991 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 8992 * This effectively positions the object post-layout, in addition to wherever the object's 8993 * layout placed it. 8994 * 8995 * @param translationY The vertical position of this view relative to its top position, 8996 * in pixels. 8997 * 8998 * @attr ref android.R.styleable#View_translationY 8999 */ 9000 public void setTranslationY(float translationY) { 9001 ensureTransformationInfo(); 9002 final TransformationInfo info = mTransformationInfo; 9003 if (info.mTranslationY != translationY) { 9004 invalidateViewProperty(true, false); 9005 info.mTranslationY = translationY; 9006 info.mMatrixDirty = true; 9007 invalidateViewProperty(false, true); 9008 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 9009 mDisplayList.setTranslationY(translationY); 9010 } 9011 } 9012 } 9013 9014 /** 9015 * Hit rectangle in parent's coordinates 9016 * 9017 * @param outRect The hit rectangle of the view. 9018 */ 9019 public void getHitRect(Rect outRect) { 9020 updateMatrix(); 9021 final TransformationInfo info = mTransformationInfo; 9022 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9023 outRect.set(mLeft, mTop, mRight, mBottom); 9024 } else { 9025 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9026 tmpRect.set(-info.mPivotX, -info.mPivotY, 9027 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9028 info.mMatrix.mapRect(tmpRect); 9029 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9030 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9031 } 9032 } 9033 9034 /** 9035 * Determines whether the given point, in local coordinates is inside the view. 9036 */ 9037 /*package*/ final boolean pointInView(float localX, float localY) { 9038 return localX >= 0 && localX < (mRight - mLeft) 9039 && localY >= 0 && localY < (mBottom - mTop); 9040 } 9041 9042 /** 9043 * Utility method to determine whether the given point, in local coordinates, 9044 * is inside the view, where the area of the view is expanded by the slop factor. 9045 * This method is called while processing touch-move events to determine if the event 9046 * is still within the view. 9047 */ 9048 private boolean pointInView(float localX, float localY, float slop) { 9049 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9050 localY < ((mBottom - mTop) + slop); 9051 } 9052 9053 /** 9054 * When a view has focus and the user navigates away from it, the next view is searched for 9055 * starting from the rectangle filled in by this method. 9056 * 9057 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9058 * of the view. However, if your view maintains some idea of internal selection, 9059 * such as a cursor, or a selected row or column, you should override this method and 9060 * fill in a more specific rectangle. 9061 * 9062 * @param r The rectangle to fill in, in this view's coordinates. 9063 */ 9064 public void getFocusedRect(Rect r) { 9065 getDrawingRect(r); 9066 } 9067 9068 /** 9069 * If some part of this view is not clipped by any of its parents, then 9070 * return that area in r in global (root) coordinates. To convert r to local 9071 * coordinates (without taking possible View rotations into account), offset 9072 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9073 * If the view is completely clipped or translated out, return false. 9074 * 9075 * @param r If true is returned, r holds the global coordinates of the 9076 * visible portion of this view. 9077 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9078 * between this view and its root. globalOffet may be null. 9079 * @return true if r is non-empty (i.e. part of the view is visible at the 9080 * root level. 9081 */ 9082 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9083 int width = mRight - mLeft; 9084 int height = mBottom - mTop; 9085 if (width > 0 && height > 0) { 9086 r.set(0, 0, width, height); 9087 if (globalOffset != null) { 9088 globalOffset.set(-mScrollX, -mScrollY); 9089 } 9090 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9091 } 9092 return false; 9093 } 9094 9095 public final boolean getGlobalVisibleRect(Rect r) { 9096 return getGlobalVisibleRect(r, null); 9097 } 9098 9099 public final boolean getLocalVisibleRect(Rect r) { 9100 Point offset = new Point(); 9101 if (getGlobalVisibleRect(r, offset)) { 9102 r.offset(-offset.x, -offset.y); // make r local 9103 return true; 9104 } 9105 return false; 9106 } 9107 9108 /** 9109 * Offset this view's vertical location by the specified number of pixels. 9110 * 9111 * @param offset the number of pixels to offset the view by 9112 */ 9113 public void offsetTopAndBottom(int offset) { 9114 if (offset != 0) { 9115 updateMatrix(); 9116 final boolean matrixIsIdentity = mTransformationInfo == null 9117 || mTransformationInfo.mMatrixIsIdentity; 9118 if (matrixIsIdentity) { 9119 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 9120 invalidateViewProperty(false, false); 9121 } else { 9122 final ViewParent p = mParent; 9123 if (p != null && mAttachInfo != null) { 9124 final Rect r = mAttachInfo.mTmpInvalRect; 9125 int minTop; 9126 int maxBottom; 9127 int yLoc; 9128 if (offset < 0) { 9129 minTop = mTop + offset; 9130 maxBottom = mBottom; 9131 yLoc = offset; 9132 } else { 9133 minTop = mTop; 9134 maxBottom = mBottom + offset; 9135 yLoc = 0; 9136 } 9137 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9138 p.invalidateChild(this, r); 9139 } 9140 } 9141 } else { 9142 invalidateViewProperty(false, false); 9143 } 9144 9145 mTop += offset; 9146 mBottom += offset; 9147 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 9148 mDisplayList.offsetTopBottom(offset); 9149 invalidateViewProperty(false, false); 9150 } else { 9151 if (!matrixIsIdentity) { 9152 invalidateViewProperty(false, true); 9153 } 9154 invalidateParentIfNeeded(); 9155 } 9156 } 9157 } 9158 9159 /** 9160 * Offset this view's horizontal location by the specified amount of pixels. 9161 * 9162 * @param offset the numer of pixels to offset the view by 9163 */ 9164 public void offsetLeftAndRight(int offset) { 9165 if (offset != 0) { 9166 updateMatrix(); 9167 final boolean matrixIsIdentity = mTransformationInfo == null 9168 || mTransformationInfo.mMatrixIsIdentity; 9169 if (matrixIsIdentity) { 9170 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 9171 invalidateViewProperty(false, false); 9172 } else { 9173 final ViewParent p = mParent; 9174 if (p != null && mAttachInfo != null) { 9175 final Rect r = mAttachInfo.mTmpInvalRect; 9176 int minLeft; 9177 int maxRight; 9178 if (offset < 0) { 9179 minLeft = mLeft + offset; 9180 maxRight = mRight; 9181 } else { 9182 minLeft = mLeft; 9183 maxRight = mRight + offset; 9184 } 9185 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9186 p.invalidateChild(this, r); 9187 } 9188 } 9189 } else { 9190 invalidateViewProperty(false, false); 9191 } 9192 9193 mLeft += offset; 9194 mRight += offset; 9195 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 9196 mDisplayList.offsetLeftRight(offset); 9197 invalidateViewProperty(false, false); 9198 } else { 9199 if (!matrixIsIdentity) { 9200 invalidateViewProperty(false, true); 9201 } 9202 invalidateParentIfNeeded(); 9203 } 9204 } 9205 } 9206 9207 /** 9208 * Get the LayoutParams associated with this view. All views should have 9209 * layout parameters. These supply parameters to the <i>parent</i> of this 9210 * view specifying how it should be arranged. There are many subclasses of 9211 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9212 * of ViewGroup that are responsible for arranging their children. 9213 * 9214 * This method may return null if this View is not attached to a parent 9215 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9216 * was not invoked successfully. When a View is attached to a parent 9217 * ViewGroup, this method must not return null. 9218 * 9219 * @return The LayoutParams associated with this view, or null if no 9220 * parameters have been set yet 9221 */ 9222 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9223 public ViewGroup.LayoutParams getLayoutParams() { 9224 return mLayoutParams; 9225 } 9226 9227 /** 9228 * Set the layout parameters associated with this view. These supply 9229 * parameters to the <i>parent</i> of this view specifying how it should be 9230 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9231 * correspond to the different subclasses of ViewGroup that are responsible 9232 * for arranging their children. 9233 * 9234 * @param params The layout parameters for this view, cannot be null 9235 */ 9236 public void setLayoutParams(ViewGroup.LayoutParams params) { 9237 if (params == null) { 9238 throw new NullPointerException("Layout parameters cannot be null"); 9239 } 9240 mLayoutParams = params; 9241 if (mParent instanceof ViewGroup) { 9242 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9243 } 9244 requestLayout(); 9245 } 9246 9247 /** 9248 * Set the scrolled position of your view. This will cause a call to 9249 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9250 * invalidated. 9251 * @param x the x position to scroll to 9252 * @param y the y position to scroll to 9253 */ 9254 public void scrollTo(int x, int y) { 9255 if (mScrollX != x || mScrollY != y) { 9256 int oldX = mScrollX; 9257 int oldY = mScrollY; 9258 mScrollX = x; 9259 mScrollY = y; 9260 invalidateParentCaches(); 9261 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9262 if (!awakenScrollBars()) { 9263 postInvalidateOnAnimation(); 9264 } 9265 } 9266 } 9267 9268 /** 9269 * Move the scrolled position of your view. This will cause a call to 9270 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9271 * invalidated. 9272 * @param x the amount of pixels to scroll by horizontally 9273 * @param y the amount of pixels to scroll by vertically 9274 */ 9275 public void scrollBy(int x, int y) { 9276 scrollTo(mScrollX + x, mScrollY + y); 9277 } 9278 9279 /** 9280 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9281 * animation to fade the scrollbars out after a default delay. If a subclass 9282 * provides animated scrolling, the start delay should equal the duration 9283 * of the scrolling animation.</p> 9284 * 9285 * <p>The animation starts only if at least one of the scrollbars is 9286 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9287 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9288 * this method returns true, and false otherwise. If the animation is 9289 * started, this method calls {@link #invalidate()}; in that case the 9290 * caller should not call {@link #invalidate()}.</p> 9291 * 9292 * <p>This method should be invoked every time a subclass directly updates 9293 * the scroll parameters.</p> 9294 * 9295 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9296 * and {@link #scrollTo(int, int)}.</p> 9297 * 9298 * @return true if the animation is played, false otherwise 9299 * 9300 * @see #awakenScrollBars(int) 9301 * @see #scrollBy(int, int) 9302 * @see #scrollTo(int, int) 9303 * @see #isHorizontalScrollBarEnabled() 9304 * @see #isVerticalScrollBarEnabled() 9305 * @see #setHorizontalScrollBarEnabled(boolean) 9306 * @see #setVerticalScrollBarEnabled(boolean) 9307 */ 9308 protected boolean awakenScrollBars() { 9309 return mScrollCache != null && 9310 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9311 } 9312 9313 /** 9314 * Trigger the scrollbars to draw. 9315 * This method differs from awakenScrollBars() only in its default duration. 9316 * initialAwakenScrollBars() will show the scroll bars for longer than 9317 * usual to give the user more of a chance to notice them. 9318 * 9319 * @return true if the animation is played, false otherwise. 9320 */ 9321 private boolean initialAwakenScrollBars() { 9322 return mScrollCache != null && 9323 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9324 } 9325 9326 /** 9327 * <p> 9328 * Trigger the scrollbars to draw. When invoked this method starts an 9329 * animation to fade the scrollbars out after a fixed delay. If a subclass 9330 * provides animated scrolling, the start delay should equal the duration of 9331 * the scrolling animation. 9332 * </p> 9333 * 9334 * <p> 9335 * The animation starts only if at least one of the scrollbars is enabled, 9336 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9337 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9338 * this method returns true, and false otherwise. If the animation is 9339 * started, this method calls {@link #invalidate()}; in that case the caller 9340 * should not call {@link #invalidate()}. 9341 * </p> 9342 * 9343 * <p> 9344 * This method should be invoked everytime a subclass directly updates the 9345 * scroll parameters. 9346 * </p> 9347 * 9348 * @param startDelay the delay, in milliseconds, after which the animation 9349 * should start; when the delay is 0, the animation starts 9350 * immediately 9351 * @return true if the animation is played, false otherwise 9352 * 9353 * @see #scrollBy(int, int) 9354 * @see #scrollTo(int, int) 9355 * @see #isHorizontalScrollBarEnabled() 9356 * @see #isVerticalScrollBarEnabled() 9357 * @see #setHorizontalScrollBarEnabled(boolean) 9358 * @see #setVerticalScrollBarEnabled(boolean) 9359 */ 9360 protected boolean awakenScrollBars(int startDelay) { 9361 return awakenScrollBars(startDelay, true); 9362 } 9363 9364 /** 9365 * <p> 9366 * Trigger the scrollbars to draw. When invoked this method starts an 9367 * animation to fade the scrollbars out after a fixed delay. If a subclass 9368 * provides animated scrolling, the start delay should equal the duration of 9369 * the scrolling animation. 9370 * </p> 9371 * 9372 * <p> 9373 * The animation starts only if at least one of the scrollbars is enabled, 9374 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9375 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9376 * this method returns true, and false otherwise. If the animation is 9377 * started, this method calls {@link #invalidate()} if the invalidate parameter 9378 * is set to true; in that case the caller 9379 * should not call {@link #invalidate()}. 9380 * </p> 9381 * 9382 * <p> 9383 * This method should be invoked everytime a subclass directly updates the 9384 * scroll parameters. 9385 * </p> 9386 * 9387 * @param startDelay the delay, in milliseconds, after which the animation 9388 * should start; when the delay is 0, the animation starts 9389 * immediately 9390 * 9391 * @param invalidate Wheter this method should call invalidate 9392 * 9393 * @return true if the animation is played, false otherwise 9394 * 9395 * @see #scrollBy(int, int) 9396 * @see #scrollTo(int, int) 9397 * @see #isHorizontalScrollBarEnabled() 9398 * @see #isVerticalScrollBarEnabled() 9399 * @see #setHorizontalScrollBarEnabled(boolean) 9400 * @see #setVerticalScrollBarEnabled(boolean) 9401 */ 9402 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9403 final ScrollabilityCache scrollCache = mScrollCache; 9404 9405 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9406 return false; 9407 } 9408 9409 if (scrollCache.scrollBar == null) { 9410 scrollCache.scrollBar = new ScrollBarDrawable(); 9411 } 9412 9413 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9414 9415 if (invalidate) { 9416 // Invalidate to show the scrollbars 9417 postInvalidateOnAnimation(); 9418 } 9419 9420 if (scrollCache.state == ScrollabilityCache.OFF) { 9421 // FIXME: this is copied from WindowManagerService. 9422 // We should get this value from the system when it 9423 // is possible to do so. 9424 final int KEY_REPEAT_FIRST_DELAY = 750; 9425 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9426 } 9427 9428 // Tell mScrollCache when we should start fading. This may 9429 // extend the fade start time if one was already scheduled 9430 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9431 scrollCache.fadeStartTime = fadeStartTime; 9432 scrollCache.state = ScrollabilityCache.ON; 9433 9434 // Schedule our fader to run, unscheduling any old ones first 9435 if (mAttachInfo != null) { 9436 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9437 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9438 } 9439 9440 return true; 9441 } 9442 9443 return false; 9444 } 9445 9446 /** 9447 * Do not invalidate views which are not visible and which are not running an animation. They 9448 * will not get drawn and they should not set dirty flags as if they will be drawn 9449 */ 9450 private boolean skipInvalidate() { 9451 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9452 (!(mParent instanceof ViewGroup) || 9453 !((ViewGroup) mParent).isViewTransitioning(this)); 9454 } 9455 /** 9456 * Mark the area defined by dirty as needing to be drawn. If the view is 9457 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9458 * in the future. This must be called from a UI thread. To call from a non-UI 9459 * thread, call {@link #postInvalidate()}. 9460 * 9461 * WARNING: This method is destructive to dirty. 9462 * @param dirty the rectangle representing the bounds of the dirty region 9463 */ 9464 public void invalidate(Rect dirty) { 9465 if (ViewDebug.TRACE_HIERARCHY) { 9466 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9467 } 9468 9469 if (skipInvalidate()) { 9470 return; 9471 } 9472 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9473 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9474 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9475 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9476 mPrivateFlags |= INVALIDATED; 9477 mPrivateFlags |= DIRTY; 9478 final ViewParent p = mParent; 9479 final AttachInfo ai = mAttachInfo; 9480 //noinspection PointlessBooleanExpression,ConstantConditions 9481 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9482 if (p != null && ai != null && ai.mHardwareAccelerated) { 9483 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9484 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9485 p.invalidateChild(this, null); 9486 return; 9487 } 9488 } 9489 if (p != null && ai != null) { 9490 final int scrollX = mScrollX; 9491 final int scrollY = mScrollY; 9492 final Rect r = ai.mTmpInvalRect; 9493 r.set(dirty.left - scrollX, dirty.top - scrollY, 9494 dirty.right - scrollX, dirty.bottom - scrollY); 9495 mParent.invalidateChild(this, r); 9496 } 9497 } 9498 } 9499 9500 /** 9501 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9502 * The coordinates of the dirty rect are relative to the view. 9503 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9504 * will be called at some point in the future. This must be called from 9505 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9506 * @param l the left position of the dirty region 9507 * @param t the top position of the dirty region 9508 * @param r the right position of the dirty region 9509 * @param b the bottom position of the dirty region 9510 */ 9511 public void invalidate(int l, int t, int r, int b) { 9512 if (ViewDebug.TRACE_HIERARCHY) { 9513 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9514 } 9515 9516 if (skipInvalidate()) { 9517 return; 9518 } 9519 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9520 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9521 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9522 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9523 mPrivateFlags |= INVALIDATED; 9524 mPrivateFlags |= DIRTY; 9525 final ViewParent p = mParent; 9526 final AttachInfo ai = mAttachInfo; 9527 //noinspection PointlessBooleanExpression,ConstantConditions 9528 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9529 if (p != null && ai != null && ai.mHardwareAccelerated) { 9530 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9531 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9532 p.invalidateChild(this, null); 9533 return; 9534 } 9535 } 9536 if (p != null && ai != null && l < r && t < b) { 9537 final int scrollX = mScrollX; 9538 final int scrollY = mScrollY; 9539 final Rect tmpr = ai.mTmpInvalRect; 9540 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9541 p.invalidateChild(this, tmpr); 9542 } 9543 } 9544 } 9545 9546 /** 9547 * Invalidate the whole view. If the view is visible, 9548 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9549 * the future. This must be called from a UI thread. To call from a non-UI thread, 9550 * call {@link #postInvalidate()}. 9551 */ 9552 public void invalidate() { 9553 invalidate(true); 9554 } 9555 9556 /** 9557 * This is where the invalidate() work actually happens. A full invalidate() 9558 * causes the drawing cache to be invalidated, but this function can be called with 9559 * invalidateCache set to false to skip that invalidation step for cases that do not 9560 * need it (for example, a component that remains at the same dimensions with the same 9561 * content). 9562 * 9563 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9564 * well. This is usually true for a full invalidate, but may be set to false if the 9565 * View's contents or dimensions have not changed. 9566 */ 9567 void invalidate(boolean invalidateCache) { 9568 if (ViewDebug.TRACE_HIERARCHY) { 9569 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9570 } 9571 9572 if (skipInvalidate()) { 9573 return; 9574 } 9575 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9576 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 9577 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 9578 mLastIsOpaque = isOpaque(); 9579 mPrivateFlags &= ~DRAWN; 9580 mPrivateFlags |= DIRTY; 9581 if (invalidateCache) { 9582 mPrivateFlags |= INVALIDATED; 9583 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9584 } 9585 final AttachInfo ai = mAttachInfo; 9586 final ViewParent p = mParent; 9587 //noinspection PointlessBooleanExpression,ConstantConditions 9588 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9589 if (p != null && ai != null && ai.mHardwareAccelerated) { 9590 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9591 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9592 p.invalidateChild(this, null); 9593 return; 9594 } 9595 } 9596 9597 if (p != null && ai != null) { 9598 final Rect r = ai.mTmpInvalRect; 9599 r.set(0, 0, mRight - mLeft, mBottom - mTop); 9600 // Don't call invalidate -- we don't want to internally scroll 9601 // our own bounds 9602 p.invalidateChild(this, r); 9603 } 9604 } 9605 } 9606 9607 /** 9608 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 9609 * set any flags or handle all of the cases handled by the default invalidation methods. 9610 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 9611 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 9612 * walk up the hierarchy, transforming the dirty rect as necessary. 9613 * 9614 * The method also handles normal invalidation logic if display list properties are not 9615 * being used in this view. The invalidateParent and forceRedraw flags are used by that 9616 * backup approach, to handle these cases used in the various property-setting methods. 9617 * 9618 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 9619 * are not being used in this view 9620 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 9621 * list properties are not being used in this view 9622 */ 9623 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 9624 if (!USE_DISPLAY_LIST_PROPERTIES || mDisplayList == null || 9625 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 9626 if (invalidateParent) { 9627 invalidateParentCaches(); 9628 } 9629 if (forceRedraw) { 9630 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9631 } 9632 invalidate(false); 9633 } else { 9634 final AttachInfo ai = mAttachInfo; 9635 final ViewParent p = mParent; 9636 if (p != null && ai != null) { 9637 final Rect r = ai.mTmpInvalRect; 9638 r.set(0, 0, mRight - mLeft, mBottom - mTop); 9639 if (mParent instanceof ViewGroup) { 9640 ((ViewGroup) mParent).invalidateChildFast(this, r); 9641 } else { 9642 mParent.invalidateChild(this, r); 9643 } 9644 } 9645 } 9646 } 9647 9648 /** 9649 * Utility method to transform a given Rect by the current matrix of this view. 9650 */ 9651 void transformRect(final Rect rect) { 9652 if (!getMatrix().isIdentity()) { 9653 RectF boundingRect = mAttachInfo.mTmpTransformRect; 9654 boundingRect.set(rect); 9655 getMatrix().mapRect(boundingRect); 9656 rect.set((int) (boundingRect.left - 0.5f), 9657 (int) (boundingRect.top - 0.5f), 9658 (int) (boundingRect.right + 0.5f), 9659 (int) (boundingRect.bottom + 0.5f)); 9660 } 9661 } 9662 9663 /** 9664 * Used to indicate that the parent of this view should clear its caches. This functionality 9665 * is used to force the parent to rebuild its display list (when hardware-accelerated), 9666 * which is necessary when various parent-managed properties of the view change, such as 9667 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 9668 * clears the parent caches and does not causes an invalidate event. 9669 * 9670 * @hide 9671 */ 9672 protected void invalidateParentCaches() { 9673 if (mParent instanceof View) { 9674 ((View) mParent).mPrivateFlags |= INVALIDATED; 9675 } 9676 } 9677 9678 /** 9679 * Used to indicate that the parent of this view should be invalidated. This functionality 9680 * is used to force the parent to rebuild its display list (when hardware-accelerated), 9681 * which is necessary when various parent-managed properties of the view change, such as 9682 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 9683 * an invalidation event to the parent. 9684 * 9685 * @hide 9686 */ 9687 protected void invalidateParentIfNeeded() { 9688 if (isHardwareAccelerated() && mParent instanceof View) { 9689 ((View) mParent).invalidate(true); 9690 } 9691 } 9692 9693 /** 9694 * Indicates whether this View is opaque. An opaque View guarantees that it will 9695 * draw all the pixels overlapping its bounds using a fully opaque color. 9696 * 9697 * Subclasses of View should override this method whenever possible to indicate 9698 * whether an instance is opaque. Opaque Views are treated in a special way by 9699 * the View hierarchy, possibly allowing it to perform optimizations during 9700 * invalidate/draw passes. 9701 * 9702 * @return True if this View is guaranteed to be fully opaque, false otherwise. 9703 */ 9704 @ViewDebug.ExportedProperty(category = "drawing") 9705 public boolean isOpaque() { 9706 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 9707 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 9708 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 9709 } 9710 9711 /** 9712 * @hide 9713 */ 9714 protected void computeOpaqueFlags() { 9715 // Opaque if: 9716 // - Has a background 9717 // - Background is opaque 9718 // - Doesn't have scrollbars or scrollbars are inside overlay 9719 9720 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 9721 mPrivateFlags |= OPAQUE_BACKGROUND; 9722 } else { 9723 mPrivateFlags &= ~OPAQUE_BACKGROUND; 9724 } 9725 9726 final int flags = mViewFlags; 9727 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 9728 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 9729 mPrivateFlags |= OPAQUE_SCROLLBARS; 9730 } else { 9731 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 9732 } 9733 } 9734 9735 /** 9736 * @hide 9737 */ 9738 protected boolean hasOpaqueScrollbars() { 9739 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 9740 } 9741 9742 /** 9743 * @return A handler associated with the thread running the View. This 9744 * handler can be used to pump events in the UI events queue. 9745 */ 9746 public Handler getHandler() { 9747 if (mAttachInfo != null) { 9748 return mAttachInfo.mHandler; 9749 } 9750 return null; 9751 } 9752 9753 /** 9754 * Gets the view root associated with the View. 9755 * @return The view root, or null if none. 9756 * @hide 9757 */ 9758 public ViewRootImpl getViewRootImpl() { 9759 if (mAttachInfo != null) { 9760 return mAttachInfo.mViewRootImpl; 9761 } 9762 return null; 9763 } 9764 9765 /** 9766 * <p>Causes the Runnable to be added to the message queue. 9767 * The runnable will be run on the user interface thread.</p> 9768 * 9769 * <p>This method can be invoked from outside of the UI thread 9770 * only when this View is attached to a window.</p> 9771 * 9772 * @param action The Runnable that will be executed. 9773 * 9774 * @return Returns true if the Runnable was successfully placed in to the 9775 * message queue. Returns false on failure, usually because the 9776 * looper processing the message queue is exiting. 9777 * 9778 * @see #postDelayed 9779 * @see #removeCallbacks 9780 */ 9781 public boolean post(Runnable action) { 9782 final AttachInfo attachInfo = mAttachInfo; 9783 if (attachInfo != null) { 9784 return attachInfo.mHandler.post(action); 9785 } 9786 // Assume that post will succeed later 9787 ViewRootImpl.getRunQueue().post(action); 9788 return true; 9789 } 9790 9791 /** 9792 * <p>Causes the Runnable to be added to the message queue, to be run 9793 * after the specified amount of time elapses. 9794 * The runnable will be run on the user interface thread.</p> 9795 * 9796 * <p>This method can be invoked from outside of the UI thread 9797 * only when this View is attached to a window.</p> 9798 * 9799 * @param action The Runnable that will be executed. 9800 * @param delayMillis The delay (in milliseconds) until the Runnable 9801 * will be executed. 9802 * 9803 * @return true if the Runnable was successfully placed in to the 9804 * message queue. Returns false on failure, usually because the 9805 * looper processing the message queue is exiting. Note that a 9806 * result of true does not mean the Runnable will be processed -- 9807 * if the looper is quit before the delivery time of the message 9808 * occurs then the message will be dropped. 9809 * 9810 * @see #post 9811 * @see #removeCallbacks 9812 */ 9813 public boolean postDelayed(Runnable action, long delayMillis) { 9814 final AttachInfo attachInfo = mAttachInfo; 9815 if (attachInfo != null) { 9816 return attachInfo.mHandler.postDelayed(action, delayMillis); 9817 } 9818 // Assume that post will succeed later 9819 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 9820 return true; 9821 } 9822 9823 /** 9824 * <p>Causes the Runnable to execute on the next animation time step. 9825 * The runnable will be run on the user interface thread.</p> 9826 * 9827 * <p>This method can be invoked from outside of the UI thread 9828 * only when this View is attached to a window.</p> 9829 * 9830 * @param action The Runnable that will be executed. 9831 * 9832 * @see #postOnAnimationDelayed 9833 * @see #removeCallbacks 9834 */ 9835 public void postOnAnimation(Runnable action) { 9836 final AttachInfo attachInfo = mAttachInfo; 9837 if (attachInfo != null) { 9838 attachInfo.mViewRootImpl.mChoreographer.postCallback( 9839 Choreographer.CALLBACK_ANIMATION, action, null); 9840 } else { 9841 // Assume that post will succeed later 9842 ViewRootImpl.getRunQueue().post(action); 9843 } 9844 } 9845 9846 /** 9847 * <p>Causes the Runnable to execute on the next animation time step, 9848 * after the specified amount of time elapses. 9849 * The runnable will be run on the user interface thread.</p> 9850 * 9851 * <p>This method can be invoked from outside of the UI thread 9852 * only when this View is attached to a window.</p> 9853 * 9854 * @param action The Runnable that will be executed. 9855 * @param delayMillis The delay (in milliseconds) until the Runnable 9856 * will be executed. 9857 * 9858 * @see #postOnAnimation 9859 * @see #removeCallbacks 9860 */ 9861 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 9862 final AttachInfo attachInfo = mAttachInfo; 9863 if (attachInfo != null) { 9864 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 9865 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 9866 } else { 9867 // Assume that post will succeed later 9868 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 9869 } 9870 } 9871 9872 /** 9873 * <p>Removes the specified Runnable from the message queue.</p> 9874 * 9875 * <p>This method can be invoked from outside of the UI thread 9876 * only when this View is attached to a window.</p> 9877 * 9878 * @param action The Runnable to remove from the message handling queue 9879 * 9880 * @return true if this view could ask the Handler to remove the Runnable, 9881 * false otherwise. When the returned value is true, the Runnable 9882 * may or may not have been actually removed from the message queue 9883 * (for instance, if the Runnable was not in the queue already.) 9884 * 9885 * @see #post 9886 * @see #postDelayed 9887 * @see #postOnAnimation 9888 * @see #postOnAnimationDelayed 9889 */ 9890 public boolean removeCallbacks(Runnable action) { 9891 if (action != null) { 9892 final AttachInfo attachInfo = mAttachInfo; 9893 if (attachInfo != null) { 9894 attachInfo.mHandler.removeCallbacks(action); 9895 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 9896 Choreographer.CALLBACK_ANIMATION, action, null); 9897 } else { 9898 // Assume that post will succeed later 9899 ViewRootImpl.getRunQueue().removeCallbacks(action); 9900 } 9901 } 9902 return true; 9903 } 9904 9905 /** 9906 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 9907 * Use this to invalidate the View from a non-UI thread.</p> 9908 * 9909 * <p>This method can be invoked from outside of the UI thread 9910 * only when this View is attached to a window.</p> 9911 * 9912 * @see #invalidate() 9913 * @see #postInvalidateDelayed(long) 9914 */ 9915 public void postInvalidate() { 9916 postInvalidateDelayed(0); 9917 } 9918 9919 /** 9920 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 9921 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 9922 * 9923 * <p>This method can be invoked from outside of the UI thread 9924 * only when this View is attached to a window.</p> 9925 * 9926 * @param left The left coordinate of the rectangle to invalidate. 9927 * @param top The top coordinate of the rectangle to invalidate. 9928 * @param right The right coordinate of the rectangle to invalidate. 9929 * @param bottom The bottom coordinate of the rectangle to invalidate. 9930 * 9931 * @see #invalidate(int, int, int, int) 9932 * @see #invalidate(Rect) 9933 * @see #postInvalidateDelayed(long, int, int, int, int) 9934 */ 9935 public void postInvalidate(int left, int top, int right, int bottom) { 9936 postInvalidateDelayed(0, left, top, right, bottom); 9937 } 9938 9939 /** 9940 * <p>Cause an invalidate to happen on a subsequent cycle through the event 9941 * loop. Waits for the specified amount of time.</p> 9942 * 9943 * <p>This method can be invoked from outside of the UI thread 9944 * only when this View is attached to a window.</p> 9945 * 9946 * @param delayMilliseconds the duration in milliseconds to delay the 9947 * invalidation by 9948 * 9949 * @see #invalidate() 9950 * @see #postInvalidate() 9951 */ 9952 public void postInvalidateDelayed(long delayMilliseconds) { 9953 // We try only with the AttachInfo because there's no point in invalidating 9954 // if we are not attached to our window 9955 final AttachInfo attachInfo = mAttachInfo; 9956 if (attachInfo != null) { 9957 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 9958 } 9959 } 9960 9961 /** 9962 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 9963 * through the event loop. Waits for the specified amount of time.</p> 9964 * 9965 * <p>This method can be invoked from outside of the UI thread 9966 * only when this View is attached to a window.</p> 9967 * 9968 * @param delayMilliseconds the duration in milliseconds to delay the 9969 * invalidation by 9970 * @param left The left coordinate of the rectangle to invalidate. 9971 * @param top The top coordinate of the rectangle to invalidate. 9972 * @param right The right coordinate of the rectangle to invalidate. 9973 * @param bottom The bottom coordinate of the rectangle to invalidate. 9974 * 9975 * @see #invalidate(int, int, int, int) 9976 * @see #invalidate(Rect) 9977 * @see #postInvalidate(int, int, int, int) 9978 */ 9979 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 9980 int right, int bottom) { 9981 9982 // We try only with the AttachInfo because there's no point in invalidating 9983 // if we are not attached to our window 9984 final AttachInfo attachInfo = mAttachInfo; 9985 if (attachInfo != null) { 9986 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 9987 info.target = this; 9988 info.left = left; 9989 info.top = top; 9990 info.right = right; 9991 info.bottom = bottom; 9992 9993 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 9994 } 9995 } 9996 9997 /** 9998 * <p>Cause an invalidate to happen on the next animation time step, typically the 9999 * next display frame.</p> 10000 * 10001 * <p>This method can be invoked from outside of the UI thread 10002 * only when this View is attached to a window.</p> 10003 * 10004 * @see #invalidate() 10005 */ 10006 public void postInvalidateOnAnimation() { 10007 // We try only with the AttachInfo because there's no point in invalidating 10008 // if we are not attached to our window 10009 final AttachInfo attachInfo = mAttachInfo; 10010 if (attachInfo != null) { 10011 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10012 } 10013 } 10014 10015 /** 10016 * <p>Cause an invalidate of the specified area to happen on the next animation 10017 * time step, typically the next display frame.</p> 10018 * 10019 * <p>This method can be invoked from outside of the UI thread 10020 * only when this View is attached to a window.</p> 10021 * 10022 * @param left The left coordinate of the rectangle to invalidate. 10023 * @param top The top coordinate of the rectangle to invalidate. 10024 * @param right The right coordinate of the rectangle to invalidate. 10025 * @param bottom The bottom coordinate of the rectangle to invalidate. 10026 * 10027 * @see #invalidate(int, int, int, int) 10028 * @see #invalidate(Rect) 10029 */ 10030 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10031 // We try only with the AttachInfo because there's no point in invalidating 10032 // if we are not attached to our window 10033 final AttachInfo attachInfo = mAttachInfo; 10034 if (attachInfo != null) { 10035 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10036 info.target = this; 10037 info.left = left; 10038 info.top = top; 10039 info.right = right; 10040 info.bottom = bottom; 10041 10042 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10043 } 10044 } 10045 10046 /** 10047 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10048 * This event is sent at most once every 10049 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10050 */ 10051 private void postSendViewScrolledAccessibilityEventCallback() { 10052 if (mSendViewScrolledAccessibilityEvent == null) { 10053 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10054 } 10055 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10056 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10057 postDelayed(mSendViewScrolledAccessibilityEvent, 10058 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10059 } 10060 } 10061 10062 /** 10063 * Called by a parent to request that a child update its values for mScrollX 10064 * and mScrollY if necessary. This will typically be done if the child is 10065 * animating a scroll using a {@link android.widget.Scroller Scroller} 10066 * object. 10067 */ 10068 public void computeScroll() { 10069 } 10070 10071 /** 10072 * <p>Indicate whether the horizontal edges are faded when the view is 10073 * scrolled horizontally.</p> 10074 * 10075 * @return true if the horizontal edges should are faded on scroll, false 10076 * otherwise 10077 * 10078 * @see #setHorizontalFadingEdgeEnabled(boolean) 10079 * 10080 * @attr ref android.R.styleable#View_requiresFadingEdge 10081 */ 10082 public boolean isHorizontalFadingEdgeEnabled() { 10083 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10084 } 10085 10086 /** 10087 * <p>Define whether the horizontal edges should be faded when this view 10088 * is scrolled horizontally.</p> 10089 * 10090 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10091 * be faded when the view is scrolled 10092 * horizontally 10093 * 10094 * @see #isHorizontalFadingEdgeEnabled() 10095 * 10096 * @attr ref android.R.styleable#View_requiresFadingEdge 10097 */ 10098 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10099 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10100 if (horizontalFadingEdgeEnabled) { 10101 initScrollCache(); 10102 } 10103 10104 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10105 } 10106 } 10107 10108 /** 10109 * <p>Indicate whether the vertical edges are faded when the view is 10110 * scrolled horizontally.</p> 10111 * 10112 * @return true if the vertical edges should are faded on scroll, false 10113 * otherwise 10114 * 10115 * @see #setVerticalFadingEdgeEnabled(boolean) 10116 * 10117 * @attr ref android.R.styleable#View_requiresFadingEdge 10118 */ 10119 public boolean isVerticalFadingEdgeEnabled() { 10120 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10121 } 10122 10123 /** 10124 * <p>Define whether the vertical edges should be faded when this view 10125 * is scrolled vertically.</p> 10126 * 10127 * @param verticalFadingEdgeEnabled true if the vertical edges should 10128 * be faded when the view is scrolled 10129 * vertically 10130 * 10131 * @see #isVerticalFadingEdgeEnabled() 10132 * 10133 * @attr ref android.R.styleable#View_requiresFadingEdge 10134 */ 10135 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10136 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10137 if (verticalFadingEdgeEnabled) { 10138 initScrollCache(); 10139 } 10140 10141 mViewFlags ^= FADING_EDGE_VERTICAL; 10142 } 10143 } 10144 10145 /** 10146 * Returns the strength, or intensity, of the top faded edge. The strength is 10147 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10148 * returns 0.0 or 1.0 but no value in between. 10149 * 10150 * Subclasses should override this method to provide a smoother fade transition 10151 * when scrolling occurs. 10152 * 10153 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10154 */ 10155 protected float getTopFadingEdgeStrength() { 10156 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10157 } 10158 10159 /** 10160 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10161 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10162 * returns 0.0 or 1.0 but no value in between. 10163 * 10164 * Subclasses should override this method to provide a smoother fade transition 10165 * when scrolling occurs. 10166 * 10167 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10168 */ 10169 protected float getBottomFadingEdgeStrength() { 10170 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10171 computeVerticalScrollRange() ? 1.0f : 0.0f; 10172 } 10173 10174 /** 10175 * Returns the strength, or intensity, of the left faded edge. The strength is 10176 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10177 * returns 0.0 or 1.0 but no value in between. 10178 * 10179 * Subclasses should override this method to provide a smoother fade transition 10180 * when scrolling occurs. 10181 * 10182 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10183 */ 10184 protected float getLeftFadingEdgeStrength() { 10185 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10186 } 10187 10188 /** 10189 * Returns the strength, or intensity, of the right faded edge. The strength is 10190 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10191 * returns 0.0 or 1.0 but no value in between. 10192 * 10193 * Subclasses should override this method to provide a smoother fade transition 10194 * when scrolling occurs. 10195 * 10196 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10197 */ 10198 protected float getRightFadingEdgeStrength() { 10199 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10200 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10201 } 10202 10203 /** 10204 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10205 * scrollbar is not drawn by default.</p> 10206 * 10207 * @return true if the horizontal scrollbar should be painted, false 10208 * otherwise 10209 * 10210 * @see #setHorizontalScrollBarEnabled(boolean) 10211 */ 10212 public boolean isHorizontalScrollBarEnabled() { 10213 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10214 } 10215 10216 /** 10217 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10218 * scrollbar is not drawn by default.</p> 10219 * 10220 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10221 * be painted 10222 * 10223 * @see #isHorizontalScrollBarEnabled() 10224 */ 10225 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10226 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10227 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10228 computeOpaqueFlags(); 10229 resolvePadding(); 10230 } 10231 } 10232 10233 /** 10234 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10235 * scrollbar is not drawn by default.</p> 10236 * 10237 * @return true if the vertical scrollbar should be painted, false 10238 * otherwise 10239 * 10240 * @see #setVerticalScrollBarEnabled(boolean) 10241 */ 10242 public boolean isVerticalScrollBarEnabled() { 10243 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10244 } 10245 10246 /** 10247 * <p>Define whether the vertical scrollbar should be drawn or not. The 10248 * scrollbar is not drawn by default.</p> 10249 * 10250 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10251 * be painted 10252 * 10253 * @see #isVerticalScrollBarEnabled() 10254 */ 10255 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10256 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10257 mViewFlags ^= SCROLLBARS_VERTICAL; 10258 computeOpaqueFlags(); 10259 resolvePadding(); 10260 } 10261 } 10262 10263 /** 10264 * @hide 10265 */ 10266 protected void recomputePadding() { 10267 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10268 } 10269 10270 /** 10271 * Define whether scrollbars will fade when the view is not scrolling. 10272 * 10273 * @param fadeScrollbars wheter to enable fading 10274 * 10275 * @attr ref android.R.styleable#View_fadeScrollbars 10276 */ 10277 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10278 initScrollCache(); 10279 final ScrollabilityCache scrollabilityCache = mScrollCache; 10280 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10281 if (fadeScrollbars) { 10282 scrollabilityCache.state = ScrollabilityCache.OFF; 10283 } else { 10284 scrollabilityCache.state = ScrollabilityCache.ON; 10285 } 10286 } 10287 10288 /** 10289 * 10290 * Returns true if scrollbars will fade when this view is not scrolling 10291 * 10292 * @return true if scrollbar fading is enabled 10293 * 10294 * @attr ref android.R.styleable#View_fadeScrollbars 10295 */ 10296 public boolean isScrollbarFadingEnabled() { 10297 return mScrollCache != null && mScrollCache.fadeScrollBars; 10298 } 10299 10300 /** 10301 * 10302 * Returns the delay before scrollbars fade. 10303 * 10304 * @return the delay before scrollbars fade 10305 * 10306 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10307 */ 10308 public int getScrollBarDefaultDelayBeforeFade() { 10309 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10310 mScrollCache.scrollBarDefaultDelayBeforeFade; 10311 } 10312 10313 /** 10314 * Define the delay before scrollbars fade. 10315 * 10316 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10317 * 10318 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10319 */ 10320 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10321 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10322 } 10323 10324 /** 10325 * 10326 * Returns the scrollbar fade duration. 10327 * 10328 * @return the scrollbar fade duration 10329 * 10330 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10331 */ 10332 public int getScrollBarFadeDuration() { 10333 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10334 mScrollCache.scrollBarFadeDuration; 10335 } 10336 10337 /** 10338 * Define the scrollbar fade duration. 10339 * 10340 * @param scrollBarFadeDuration - the scrollbar fade duration 10341 * 10342 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10343 */ 10344 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10345 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10346 } 10347 10348 /** 10349 * 10350 * Returns the scrollbar size. 10351 * 10352 * @return the scrollbar size 10353 * 10354 * @attr ref android.R.styleable#View_scrollbarSize 10355 */ 10356 public int getScrollBarSize() { 10357 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10358 mScrollCache.scrollBarSize; 10359 } 10360 10361 /** 10362 * Define the scrollbar size. 10363 * 10364 * @param scrollBarSize - the scrollbar size 10365 * 10366 * @attr ref android.R.styleable#View_scrollbarSize 10367 */ 10368 public void setScrollBarSize(int scrollBarSize) { 10369 getScrollCache().scrollBarSize = scrollBarSize; 10370 } 10371 10372 /** 10373 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10374 * inset. When inset, they add to the padding of the view. And the scrollbars 10375 * can be drawn inside the padding area or on the edge of the view. For example, 10376 * if a view has a background drawable and you want to draw the scrollbars 10377 * inside the padding specified by the drawable, you can use 10378 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10379 * appear at the edge of the view, ignoring the padding, then you can use 10380 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10381 * @param style the style of the scrollbars. Should be one of 10382 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10383 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10384 * @see #SCROLLBARS_INSIDE_OVERLAY 10385 * @see #SCROLLBARS_INSIDE_INSET 10386 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10387 * @see #SCROLLBARS_OUTSIDE_INSET 10388 * 10389 * @attr ref android.R.styleable#View_scrollbarStyle 10390 */ 10391 public void setScrollBarStyle(int style) { 10392 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10393 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10394 computeOpaqueFlags(); 10395 resolvePadding(); 10396 } 10397 } 10398 10399 /** 10400 * <p>Returns the current scrollbar style.</p> 10401 * @return the current scrollbar style 10402 * @see #SCROLLBARS_INSIDE_OVERLAY 10403 * @see #SCROLLBARS_INSIDE_INSET 10404 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10405 * @see #SCROLLBARS_OUTSIDE_INSET 10406 * 10407 * @attr ref android.R.styleable#View_scrollbarStyle 10408 */ 10409 @ViewDebug.ExportedProperty(mapping = { 10410 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10411 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10412 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10413 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10414 }) 10415 public int getScrollBarStyle() { 10416 return mViewFlags & SCROLLBARS_STYLE_MASK; 10417 } 10418 10419 /** 10420 * <p>Compute the horizontal range that the horizontal scrollbar 10421 * represents.</p> 10422 * 10423 * <p>The range is expressed in arbitrary units that must be the same as the 10424 * units used by {@link #computeHorizontalScrollExtent()} and 10425 * {@link #computeHorizontalScrollOffset()}.</p> 10426 * 10427 * <p>The default range is the drawing width of this view.</p> 10428 * 10429 * @return the total horizontal range represented by the horizontal 10430 * scrollbar 10431 * 10432 * @see #computeHorizontalScrollExtent() 10433 * @see #computeHorizontalScrollOffset() 10434 * @see android.widget.ScrollBarDrawable 10435 */ 10436 protected int computeHorizontalScrollRange() { 10437 return getWidth(); 10438 } 10439 10440 /** 10441 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10442 * within the horizontal range. This value is used to compute the position 10443 * of the thumb within the scrollbar's track.</p> 10444 * 10445 * <p>The range is expressed in arbitrary units that must be the same as the 10446 * units used by {@link #computeHorizontalScrollRange()} and 10447 * {@link #computeHorizontalScrollExtent()}.</p> 10448 * 10449 * <p>The default offset is the scroll offset of this view.</p> 10450 * 10451 * @return the horizontal offset of the scrollbar's thumb 10452 * 10453 * @see #computeHorizontalScrollRange() 10454 * @see #computeHorizontalScrollExtent() 10455 * @see android.widget.ScrollBarDrawable 10456 */ 10457 protected int computeHorizontalScrollOffset() { 10458 return mScrollX; 10459 } 10460 10461 /** 10462 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10463 * within the horizontal range. This value is used to compute the length 10464 * of the thumb within the scrollbar's track.</p> 10465 * 10466 * <p>The range is expressed in arbitrary units that must be the same as the 10467 * units used by {@link #computeHorizontalScrollRange()} and 10468 * {@link #computeHorizontalScrollOffset()}.</p> 10469 * 10470 * <p>The default extent is the drawing width of this view.</p> 10471 * 10472 * @return the horizontal extent of the scrollbar's thumb 10473 * 10474 * @see #computeHorizontalScrollRange() 10475 * @see #computeHorizontalScrollOffset() 10476 * @see android.widget.ScrollBarDrawable 10477 */ 10478 protected int computeHorizontalScrollExtent() { 10479 return getWidth(); 10480 } 10481 10482 /** 10483 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10484 * 10485 * <p>The range is expressed in arbitrary units that must be the same as the 10486 * units used by {@link #computeVerticalScrollExtent()} and 10487 * {@link #computeVerticalScrollOffset()}.</p> 10488 * 10489 * @return the total vertical range represented by the vertical scrollbar 10490 * 10491 * <p>The default range is the drawing height of this view.</p> 10492 * 10493 * @see #computeVerticalScrollExtent() 10494 * @see #computeVerticalScrollOffset() 10495 * @see android.widget.ScrollBarDrawable 10496 */ 10497 protected int computeVerticalScrollRange() { 10498 return getHeight(); 10499 } 10500 10501 /** 10502 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10503 * within the horizontal range. This value is used to compute the position 10504 * of the thumb within the scrollbar's track.</p> 10505 * 10506 * <p>The range is expressed in arbitrary units that must be the same as the 10507 * units used by {@link #computeVerticalScrollRange()} and 10508 * {@link #computeVerticalScrollExtent()}.</p> 10509 * 10510 * <p>The default offset is the scroll offset of this view.</p> 10511 * 10512 * @return the vertical offset of the scrollbar's thumb 10513 * 10514 * @see #computeVerticalScrollRange() 10515 * @see #computeVerticalScrollExtent() 10516 * @see android.widget.ScrollBarDrawable 10517 */ 10518 protected int computeVerticalScrollOffset() { 10519 return mScrollY; 10520 } 10521 10522 /** 10523 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10524 * within the vertical range. This value is used to compute the length 10525 * of the thumb within the scrollbar's track.</p> 10526 * 10527 * <p>The range is expressed in arbitrary units that must be the same as the 10528 * units used by {@link #computeVerticalScrollRange()} and 10529 * {@link #computeVerticalScrollOffset()}.</p> 10530 * 10531 * <p>The default extent is the drawing height of this view.</p> 10532 * 10533 * @return the vertical extent of the scrollbar's thumb 10534 * 10535 * @see #computeVerticalScrollRange() 10536 * @see #computeVerticalScrollOffset() 10537 * @see android.widget.ScrollBarDrawable 10538 */ 10539 protected int computeVerticalScrollExtent() { 10540 return getHeight(); 10541 } 10542 10543 /** 10544 * Check if this view can be scrolled horizontally in a certain direction. 10545 * 10546 * @param direction Negative to check scrolling left, positive to check scrolling right. 10547 * @return true if this view can be scrolled in the specified direction, false otherwise. 10548 */ 10549 public boolean canScrollHorizontally(int direction) { 10550 final int offset = computeHorizontalScrollOffset(); 10551 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10552 if (range == 0) return false; 10553 if (direction < 0) { 10554 return offset > 0; 10555 } else { 10556 return offset < range - 1; 10557 } 10558 } 10559 10560 /** 10561 * Check if this view can be scrolled vertically in a certain direction. 10562 * 10563 * @param direction Negative to check scrolling up, positive to check scrolling down. 10564 * @return true if this view can be scrolled in the specified direction, false otherwise. 10565 */ 10566 public boolean canScrollVertically(int direction) { 10567 final int offset = computeVerticalScrollOffset(); 10568 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10569 if (range == 0) return false; 10570 if (direction < 0) { 10571 return offset > 0; 10572 } else { 10573 return offset < range - 1; 10574 } 10575 } 10576 10577 /** 10578 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 10579 * scrollbars are painted only if they have been awakened first.</p> 10580 * 10581 * @param canvas the canvas on which to draw the scrollbars 10582 * 10583 * @see #awakenScrollBars(int) 10584 */ 10585 protected final void onDrawScrollBars(Canvas canvas) { 10586 // scrollbars are drawn only when the animation is running 10587 final ScrollabilityCache cache = mScrollCache; 10588 if (cache != null) { 10589 10590 int state = cache.state; 10591 10592 if (state == ScrollabilityCache.OFF) { 10593 return; 10594 } 10595 10596 boolean invalidate = false; 10597 10598 if (state == ScrollabilityCache.FADING) { 10599 // We're fading -- get our fade interpolation 10600 if (cache.interpolatorValues == null) { 10601 cache.interpolatorValues = new float[1]; 10602 } 10603 10604 float[] values = cache.interpolatorValues; 10605 10606 // Stops the animation if we're done 10607 if (cache.scrollBarInterpolator.timeToValues(values) == 10608 Interpolator.Result.FREEZE_END) { 10609 cache.state = ScrollabilityCache.OFF; 10610 } else { 10611 cache.scrollBar.setAlpha(Math.round(values[0])); 10612 } 10613 10614 // This will make the scroll bars inval themselves after 10615 // drawing. We only want this when we're fading so that 10616 // we prevent excessive redraws 10617 invalidate = true; 10618 } else { 10619 // We're just on -- but we may have been fading before so 10620 // reset alpha 10621 cache.scrollBar.setAlpha(255); 10622 } 10623 10624 10625 final int viewFlags = mViewFlags; 10626 10627 final boolean drawHorizontalScrollBar = 10628 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10629 final boolean drawVerticalScrollBar = 10630 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 10631 && !isVerticalScrollBarHidden(); 10632 10633 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 10634 final int width = mRight - mLeft; 10635 final int height = mBottom - mTop; 10636 10637 final ScrollBarDrawable scrollBar = cache.scrollBar; 10638 10639 final int scrollX = mScrollX; 10640 final int scrollY = mScrollY; 10641 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 10642 10643 int left, top, right, bottom; 10644 10645 if (drawHorizontalScrollBar) { 10646 int size = scrollBar.getSize(false); 10647 if (size <= 0) { 10648 size = cache.scrollBarSize; 10649 } 10650 10651 scrollBar.setParameters(computeHorizontalScrollRange(), 10652 computeHorizontalScrollOffset(), 10653 computeHorizontalScrollExtent(), false); 10654 final int verticalScrollBarGap = drawVerticalScrollBar ? 10655 getVerticalScrollbarWidth() : 0; 10656 top = scrollY + height - size - (mUserPaddingBottom & inside); 10657 left = scrollX + (mPaddingLeft & inside); 10658 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 10659 bottom = top + size; 10660 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 10661 if (invalidate) { 10662 invalidate(left, top, right, bottom); 10663 } 10664 } 10665 10666 if (drawVerticalScrollBar) { 10667 int size = scrollBar.getSize(true); 10668 if (size <= 0) { 10669 size = cache.scrollBarSize; 10670 } 10671 10672 scrollBar.setParameters(computeVerticalScrollRange(), 10673 computeVerticalScrollOffset(), 10674 computeVerticalScrollExtent(), true); 10675 switch (mVerticalScrollbarPosition) { 10676 default: 10677 case SCROLLBAR_POSITION_DEFAULT: 10678 case SCROLLBAR_POSITION_RIGHT: 10679 left = scrollX + width - size - (mUserPaddingRight & inside); 10680 break; 10681 case SCROLLBAR_POSITION_LEFT: 10682 left = scrollX + (mUserPaddingLeft & inside); 10683 break; 10684 } 10685 top = scrollY + (mPaddingTop & inside); 10686 right = left + size; 10687 bottom = scrollY + height - (mUserPaddingBottom & inside); 10688 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 10689 if (invalidate) { 10690 invalidate(left, top, right, bottom); 10691 } 10692 } 10693 } 10694 } 10695 } 10696 10697 /** 10698 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 10699 * FastScroller is visible. 10700 * @return whether to temporarily hide the vertical scrollbar 10701 * @hide 10702 */ 10703 protected boolean isVerticalScrollBarHidden() { 10704 return false; 10705 } 10706 10707 /** 10708 * <p>Draw the horizontal scrollbar if 10709 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 10710 * 10711 * @param canvas the canvas on which to draw the scrollbar 10712 * @param scrollBar the scrollbar's drawable 10713 * 10714 * @see #isHorizontalScrollBarEnabled() 10715 * @see #computeHorizontalScrollRange() 10716 * @see #computeHorizontalScrollExtent() 10717 * @see #computeHorizontalScrollOffset() 10718 * @see android.widget.ScrollBarDrawable 10719 * @hide 10720 */ 10721 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 10722 int l, int t, int r, int b) { 10723 scrollBar.setBounds(l, t, r, b); 10724 scrollBar.draw(canvas); 10725 } 10726 10727 /** 10728 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 10729 * returns true.</p> 10730 * 10731 * @param canvas the canvas on which to draw the scrollbar 10732 * @param scrollBar the scrollbar's drawable 10733 * 10734 * @see #isVerticalScrollBarEnabled() 10735 * @see #computeVerticalScrollRange() 10736 * @see #computeVerticalScrollExtent() 10737 * @see #computeVerticalScrollOffset() 10738 * @see android.widget.ScrollBarDrawable 10739 * @hide 10740 */ 10741 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 10742 int l, int t, int r, int b) { 10743 scrollBar.setBounds(l, t, r, b); 10744 scrollBar.draw(canvas); 10745 } 10746 10747 /** 10748 * Implement this to do your drawing. 10749 * 10750 * @param canvas the canvas on which the background will be drawn 10751 */ 10752 protected void onDraw(Canvas canvas) { 10753 } 10754 10755 /* 10756 * Caller is responsible for calling requestLayout if necessary. 10757 * (This allows addViewInLayout to not request a new layout.) 10758 */ 10759 void assignParent(ViewParent parent) { 10760 if (mParent == null) { 10761 mParent = parent; 10762 } else if (parent == null) { 10763 mParent = null; 10764 } else { 10765 throw new RuntimeException("view " + this + " being added, but" 10766 + " it already has a parent"); 10767 } 10768 } 10769 10770 /** 10771 * This is called when the view is attached to a window. At this point it 10772 * has a Surface and will start drawing. Note that this function is 10773 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 10774 * however it may be called any time before the first onDraw -- including 10775 * before or after {@link #onMeasure(int, int)}. 10776 * 10777 * @see #onDetachedFromWindow() 10778 */ 10779 protected void onAttachedToWindow() { 10780 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 10781 mParent.requestTransparentRegion(this); 10782 } 10783 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 10784 initialAwakenScrollBars(); 10785 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 10786 } 10787 jumpDrawablesToCurrentState(); 10788 // Order is important here: LayoutDirection MUST be resolved before Padding 10789 // and TextDirection 10790 resolveLayoutDirection(); 10791 resolvePadding(); 10792 resolveTextDirection(); 10793 resolveTextAlignment(); 10794 clearAccessibilityFocus(); 10795 if (isFocused()) { 10796 InputMethodManager imm = InputMethodManager.peekInstance(); 10797 imm.focusIn(this); 10798 } 10799 } 10800 10801 /** 10802 * @see #onScreenStateChanged(int) 10803 */ 10804 void dispatchScreenStateChanged(int screenState) { 10805 onScreenStateChanged(screenState); 10806 } 10807 10808 /** 10809 * This method is called whenever the state of the screen this view is 10810 * attached to changes. A state change will usually occurs when the screen 10811 * turns on or off (whether it happens automatically or the user does it 10812 * manually.) 10813 * 10814 * @param screenState The new state of the screen. Can be either 10815 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 10816 */ 10817 public void onScreenStateChanged(int screenState) { 10818 } 10819 10820 /** 10821 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 10822 */ 10823 private boolean hasRtlSupport() { 10824 return mContext.getApplicationInfo().hasRtlSupport(); 10825 } 10826 10827 /** 10828 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 10829 * that the parent directionality can and will be resolved before its children. 10830 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 10831 */ 10832 public void resolveLayoutDirection() { 10833 // Clear any previous layout direction resolution 10834 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 10835 10836 if (hasRtlSupport()) { 10837 // Set resolved depending on layout direction 10838 switch (getLayoutDirection()) { 10839 case LAYOUT_DIRECTION_INHERIT: 10840 // If this is root view, no need to look at parent's layout dir. 10841 if (canResolveLayoutDirection()) { 10842 ViewGroup viewGroup = ((ViewGroup) mParent); 10843 10844 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 10845 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 10846 } 10847 } else { 10848 // Nothing to do, LTR by default 10849 } 10850 break; 10851 case LAYOUT_DIRECTION_RTL: 10852 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 10853 break; 10854 case LAYOUT_DIRECTION_LOCALE: 10855 if(isLayoutDirectionRtl(Locale.getDefault())) { 10856 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 10857 } 10858 break; 10859 default: 10860 // Nothing to do, LTR by default 10861 } 10862 } 10863 10864 // Set to resolved 10865 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 10866 onResolvedLayoutDirectionChanged(); 10867 // Resolve padding 10868 resolvePadding(); 10869 } 10870 10871 /** 10872 * Called when layout direction has been resolved. 10873 * 10874 * The default implementation does nothing. 10875 */ 10876 public void onResolvedLayoutDirectionChanged() { 10877 } 10878 10879 /** 10880 * Resolve padding depending on layout direction. 10881 */ 10882 public void resolvePadding() { 10883 // If the user specified the absolute padding (either with android:padding or 10884 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 10885 // use the default padding or the padding from the background drawable 10886 // (stored at this point in mPadding*) 10887 int resolvedLayoutDirection = getResolvedLayoutDirection(); 10888 switch (resolvedLayoutDirection) { 10889 case LAYOUT_DIRECTION_RTL: 10890 // Start user padding override Right user padding. Otherwise, if Right user 10891 // padding is not defined, use the default Right padding. If Right user padding 10892 // is defined, just use it. 10893 if (mUserPaddingStart >= 0) { 10894 mUserPaddingRight = mUserPaddingStart; 10895 } else if (mUserPaddingRight < 0) { 10896 mUserPaddingRight = mPaddingRight; 10897 } 10898 if (mUserPaddingEnd >= 0) { 10899 mUserPaddingLeft = mUserPaddingEnd; 10900 } else if (mUserPaddingLeft < 0) { 10901 mUserPaddingLeft = mPaddingLeft; 10902 } 10903 break; 10904 case LAYOUT_DIRECTION_LTR: 10905 default: 10906 // Start user padding override Left user padding. Otherwise, if Left user 10907 // padding is not defined, use the default left padding. If Left user padding 10908 // is defined, just use it. 10909 if (mUserPaddingStart >= 0) { 10910 mUserPaddingLeft = mUserPaddingStart; 10911 } else if (mUserPaddingLeft < 0) { 10912 mUserPaddingLeft = mPaddingLeft; 10913 } 10914 if (mUserPaddingEnd >= 0) { 10915 mUserPaddingRight = mUserPaddingEnd; 10916 } else if (mUserPaddingRight < 0) { 10917 mUserPaddingRight = mPaddingRight; 10918 } 10919 } 10920 10921 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 10922 10923 if(isPaddingRelative()) { 10924 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 10925 } else { 10926 recomputePadding(); 10927 } 10928 onPaddingChanged(resolvedLayoutDirection); 10929 } 10930 10931 /** 10932 * Resolve padding depending on the layout direction. Subclasses that care about 10933 * padding resolution should override this method. The default implementation does 10934 * nothing. 10935 * 10936 * @param layoutDirection the direction of the layout 10937 * 10938 * @see {@link #LAYOUT_DIRECTION_LTR} 10939 * @see {@link #LAYOUT_DIRECTION_RTL} 10940 */ 10941 public void onPaddingChanged(int layoutDirection) { 10942 } 10943 10944 /** 10945 * Check if layout direction resolution can be done. 10946 * 10947 * @return true if layout direction resolution can be done otherwise return false. 10948 */ 10949 public boolean canResolveLayoutDirection() { 10950 switch (getLayoutDirection()) { 10951 case LAYOUT_DIRECTION_INHERIT: 10952 return (mParent != null) && (mParent instanceof ViewGroup); 10953 default: 10954 return true; 10955 } 10956 } 10957 10958 /** 10959 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 10960 * when reset is done. 10961 */ 10962 public void resetResolvedLayoutDirection() { 10963 // Reset the current resolved bits 10964 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 10965 onResolvedLayoutDirectionReset(); 10966 // Reset also the text direction 10967 resetResolvedTextDirection(); 10968 } 10969 10970 /** 10971 * Called during reset of resolved layout direction. 10972 * 10973 * Subclasses need to override this method to clear cached information that depends on the 10974 * resolved layout direction, or to inform child views that inherit their layout direction. 10975 * 10976 * The default implementation does nothing. 10977 */ 10978 public void onResolvedLayoutDirectionReset() { 10979 } 10980 10981 /** 10982 * Check if a Locale uses an RTL script. 10983 * 10984 * @param locale Locale to check 10985 * @return true if the Locale uses an RTL script. 10986 */ 10987 protected static boolean isLayoutDirectionRtl(Locale locale) { 10988 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 10989 } 10990 10991 /** 10992 * This is called when the view is detached from a window. At this point it 10993 * no longer has a surface for drawing. 10994 * 10995 * @see #onAttachedToWindow() 10996 */ 10997 protected void onDetachedFromWindow() { 10998 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 10999 11000 removeUnsetPressCallback(); 11001 removeLongPressCallback(); 11002 removePerformClickCallback(); 11003 removeSendViewScrolledAccessibilityEventCallback(); 11004 11005 destroyDrawingCache(); 11006 11007 destroyLayer(false); 11008 11009 if (mAttachInfo != null) { 11010 if (mDisplayList != null) { 11011 mAttachInfo.mViewRootImpl.invalidateDisplayList(mDisplayList); 11012 } 11013 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11014 } else { 11015 if (mDisplayList != null) { 11016 // Should never happen 11017 mDisplayList.invalidate(); 11018 } 11019 } 11020 11021 mCurrentAnimation = null; 11022 11023 resetResolvedLayoutDirection(); 11024 resetResolvedTextAlignment(); 11025 resetAccessibilityStateChanged(); 11026 clearAccessibilityFocus(); 11027 } 11028 11029 /** 11030 * @return The number of times this view has been attached to a window 11031 */ 11032 protected int getWindowAttachCount() { 11033 return mWindowAttachCount; 11034 } 11035 11036 /** 11037 * Retrieve a unique token identifying the window this view is attached to. 11038 * @return Return the window's token for use in 11039 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11040 */ 11041 public IBinder getWindowToken() { 11042 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11043 } 11044 11045 /** 11046 * Retrieve a unique token identifying the top-level "real" window of 11047 * the window that this view is attached to. That is, this is like 11048 * {@link #getWindowToken}, except if the window this view in is a panel 11049 * window (attached to another containing window), then the token of 11050 * the containing window is returned instead. 11051 * 11052 * @return Returns the associated window token, either 11053 * {@link #getWindowToken()} or the containing window's token. 11054 */ 11055 public IBinder getApplicationWindowToken() { 11056 AttachInfo ai = mAttachInfo; 11057 if (ai != null) { 11058 IBinder appWindowToken = ai.mPanelParentWindowToken; 11059 if (appWindowToken == null) { 11060 appWindowToken = ai.mWindowToken; 11061 } 11062 return appWindowToken; 11063 } 11064 return null; 11065 } 11066 11067 /** 11068 * Retrieve private session object this view hierarchy is using to 11069 * communicate with the window manager. 11070 * @return the session object to communicate with the window manager 11071 */ 11072 /*package*/ IWindowSession getWindowSession() { 11073 return mAttachInfo != null ? mAttachInfo.mSession : null; 11074 } 11075 11076 /** 11077 * @param info the {@link android.view.View.AttachInfo} to associated with 11078 * this view 11079 */ 11080 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11081 //System.out.println("Attached! " + this); 11082 mAttachInfo = info; 11083 mWindowAttachCount++; 11084 // We will need to evaluate the drawable state at least once. 11085 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11086 if (mFloatingTreeObserver != null) { 11087 info.mTreeObserver.merge(mFloatingTreeObserver); 11088 mFloatingTreeObserver = null; 11089 } 11090 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11091 mAttachInfo.mScrollContainers.add(this); 11092 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11093 } 11094 performCollectViewAttributes(mAttachInfo, visibility); 11095 onAttachedToWindow(); 11096 11097 ListenerInfo li = mListenerInfo; 11098 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11099 li != null ? li.mOnAttachStateChangeListeners : null; 11100 if (listeners != null && listeners.size() > 0) { 11101 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11102 // perform the dispatching. The iterator is a safe guard against listeners that 11103 // could mutate the list by calling the various add/remove methods. This prevents 11104 // the array from being modified while we iterate it. 11105 for (OnAttachStateChangeListener listener : listeners) { 11106 listener.onViewAttachedToWindow(this); 11107 } 11108 } 11109 11110 int vis = info.mWindowVisibility; 11111 if (vis != GONE) { 11112 onWindowVisibilityChanged(vis); 11113 } 11114 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11115 // If nobody has evaluated the drawable state yet, then do it now. 11116 refreshDrawableState(); 11117 } 11118 } 11119 11120 void dispatchDetachedFromWindow() { 11121 AttachInfo info = mAttachInfo; 11122 if (info != null) { 11123 int vis = info.mWindowVisibility; 11124 if (vis != GONE) { 11125 onWindowVisibilityChanged(GONE); 11126 } 11127 } 11128 11129 onDetachedFromWindow(); 11130 11131 ListenerInfo li = mListenerInfo; 11132 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11133 li != null ? li.mOnAttachStateChangeListeners : null; 11134 if (listeners != null && listeners.size() > 0) { 11135 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11136 // perform the dispatching. The iterator is a safe guard against listeners that 11137 // could mutate the list by calling the various add/remove methods. This prevents 11138 // the array from being modified while we iterate it. 11139 for (OnAttachStateChangeListener listener : listeners) { 11140 listener.onViewDetachedFromWindow(this); 11141 } 11142 } 11143 11144 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11145 mAttachInfo.mScrollContainers.remove(this); 11146 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11147 } 11148 11149 mAttachInfo = null; 11150 } 11151 11152 /** 11153 * Store this view hierarchy's frozen state into the given container. 11154 * 11155 * @param container The SparseArray in which to save the view's state. 11156 * 11157 * @see #restoreHierarchyState(android.util.SparseArray) 11158 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11159 * @see #onSaveInstanceState() 11160 */ 11161 public void saveHierarchyState(SparseArray<Parcelable> container) { 11162 dispatchSaveInstanceState(container); 11163 } 11164 11165 /** 11166 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11167 * this view and its children. May be overridden to modify how freezing happens to a 11168 * view's children; for example, some views may want to not store state for their children. 11169 * 11170 * @param container The SparseArray in which to save the view's state. 11171 * 11172 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11173 * @see #saveHierarchyState(android.util.SparseArray) 11174 * @see #onSaveInstanceState() 11175 */ 11176 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11177 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11178 mPrivateFlags &= ~SAVE_STATE_CALLED; 11179 Parcelable state = onSaveInstanceState(); 11180 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11181 throw new IllegalStateException( 11182 "Derived class did not call super.onSaveInstanceState()"); 11183 } 11184 if (state != null) { 11185 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11186 // + ": " + state); 11187 container.put(mID, state); 11188 } 11189 } 11190 } 11191 11192 /** 11193 * Hook allowing a view to generate a representation of its internal state 11194 * that can later be used to create a new instance with that same state. 11195 * This state should only contain information that is not persistent or can 11196 * not be reconstructed later. For example, you will never store your 11197 * current position on screen because that will be computed again when a 11198 * new instance of the view is placed in its view hierarchy. 11199 * <p> 11200 * Some examples of things you may store here: the current cursor position 11201 * in a text view (but usually not the text itself since that is stored in a 11202 * content provider or other persistent storage), the currently selected 11203 * item in a list view. 11204 * 11205 * @return Returns a Parcelable object containing the view's current dynamic 11206 * state, or null if there is nothing interesting to save. The 11207 * default implementation returns null. 11208 * @see #onRestoreInstanceState(android.os.Parcelable) 11209 * @see #saveHierarchyState(android.util.SparseArray) 11210 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11211 * @see #setSaveEnabled(boolean) 11212 */ 11213 protected Parcelable onSaveInstanceState() { 11214 mPrivateFlags |= SAVE_STATE_CALLED; 11215 return BaseSavedState.EMPTY_STATE; 11216 } 11217 11218 /** 11219 * Restore this view hierarchy's frozen state from the given container. 11220 * 11221 * @param container The SparseArray which holds previously frozen states. 11222 * 11223 * @see #saveHierarchyState(android.util.SparseArray) 11224 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11225 * @see #onRestoreInstanceState(android.os.Parcelable) 11226 */ 11227 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11228 dispatchRestoreInstanceState(container); 11229 } 11230 11231 /** 11232 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11233 * state for this view and its children. May be overridden to modify how restoring 11234 * happens to a view's children; for example, some views may want to not store state 11235 * for their children. 11236 * 11237 * @param container The SparseArray which holds previously saved state. 11238 * 11239 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11240 * @see #restoreHierarchyState(android.util.SparseArray) 11241 * @see #onRestoreInstanceState(android.os.Parcelable) 11242 */ 11243 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11244 if (mID != NO_ID) { 11245 Parcelable state = container.get(mID); 11246 if (state != null) { 11247 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11248 // + ": " + state); 11249 mPrivateFlags &= ~SAVE_STATE_CALLED; 11250 onRestoreInstanceState(state); 11251 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11252 throw new IllegalStateException( 11253 "Derived class did not call super.onRestoreInstanceState()"); 11254 } 11255 } 11256 } 11257 } 11258 11259 /** 11260 * Hook allowing a view to re-apply a representation of its internal state that had previously 11261 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11262 * null state. 11263 * 11264 * @param state The frozen state that had previously been returned by 11265 * {@link #onSaveInstanceState}. 11266 * 11267 * @see #onSaveInstanceState() 11268 * @see #restoreHierarchyState(android.util.SparseArray) 11269 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11270 */ 11271 protected void onRestoreInstanceState(Parcelable state) { 11272 mPrivateFlags |= SAVE_STATE_CALLED; 11273 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11274 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11275 + "received " + state.getClass().toString() + " instead. This usually happens " 11276 + "when two views of different type have the same id in the same hierarchy. " 11277 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11278 + "other views do not use the same id."); 11279 } 11280 } 11281 11282 /** 11283 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11284 * 11285 * @return the drawing start time in milliseconds 11286 */ 11287 public long getDrawingTime() { 11288 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11289 } 11290 11291 /** 11292 * <p>Enables or disables the duplication of the parent's state into this view. When 11293 * duplication is enabled, this view gets its drawable state from its parent rather 11294 * than from its own internal properties.</p> 11295 * 11296 * <p>Note: in the current implementation, setting this property to true after the 11297 * view was added to a ViewGroup might have no effect at all. This property should 11298 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11299 * 11300 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11301 * property is enabled, an exception will be thrown.</p> 11302 * 11303 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11304 * parent, these states should not be affected by this method.</p> 11305 * 11306 * @param enabled True to enable duplication of the parent's drawable state, false 11307 * to disable it. 11308 * 11309 * @see #getDrawableState() 11310 * @see #isDuplicateParentStateEnabled() 11311 */ 11312 public void setDuplicateParentStateEnabled(boolean enabled) { 11313 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11314 } 11315 11316 /** 11317 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11318 * 11319 * @return True if this view's drawable state is duplicated from the parent, 11320 * false otherwise 11321 * 11322 * @see #getDrawableState() 11323 * @see #setDuplicateParentStateEnabled(boolean) 11324 */ 11325 public boolean isDuplicateParentStateEnabled() { 11326 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11327 } 11328 11329 /** 11330 * <p>Specifies the type of layer backing this view. The layer can be 11331 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11332 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11333 * 11334 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11335 * instance that controls how the layer is composed on screen. The following 11336 * properties of the paint are taken into account when composing the layer:</p> 11337 * <ul> 11338 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11339 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11340 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11341 * </ul> 11342 * 11343 * <p>If this view has an alpha value set to < 1.0 by calling 11344 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11345 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11346 * equivalent to setting a hardware layer on this view and providing a paint with 11347 * the desired alpha value.<p> 11348 * 11349 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11350 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11351 * for more information on when and how to use layers.</p> 11352 * 11353 * @param layerType The ype of layer to use with this view, must be one of 11354 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11355 * {@link #LAYER_TYPE_HARDWARE} 11356 * @param paint The paint used to compose the layer. This argument is optional 11357 * and can be null. It is ignored when the layer type is 11358 * {@link #LAYER_TYPE_NONE} 11359 * 11360 * @see #getLayerType() 11361 * @see #LAYER_TYPE_NONE 11362 * @see #LAYER_TYPE_SOFTWARE 11363 * @see #LAYER_TYPE_HARDWARE 11364 * @see #setAlpha(float) 11365 * 11366 * @attr ref android.R.styleable#View_layerType 11367 */ 11368 public void setLayerType(int layerType, Paint paint) { 11369 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11370 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11371 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11372 } 11373 11374 if (layerType == mLayerType) { 11375 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11376 mLayerPaint = paint == null ? new Paint() : paint; 11377 invalidateParentCaches(); 11378 invalidate(true); 11379 } 11380 return; 11381 } 11382 11383 // Destroy any previous software drawing cache if needed 11384 switch (mLayerType) { 11385 case LAYER_TYPE_HARDWARE: 11386 destroyLayer(false); 11387 // fall through - non-accelerated views may use software layer mechanism instead 11388 case LAYER_TYPE_SOFTWARE: 11389 destroyDrawingCache(); 11390 break; 11391 default: 11392 break; 11393 } 11394 11395 mLayerType = layerType; 11396 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11397 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11398 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11399 11400 invalidateParentCaches(); 11401 invalidate(true); 11402 } 11403 11404 /** 11405 * Indicates whether this view has a static layer. A view with layer type 11406 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11407 * dynamic. 11408 */ 11409 boolean hasStaticLayer() { 11410 return true; 11411 } 11412 11413 /** 11414 * Indicates what type of layer is currently associated with this view. By default 11415 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11416 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11417 * for more information on the different types of layers. 11418 * 11419 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11420 * {@link #LAYER_TYPE_HARDWARE} 11421 * 11422 * @see #setLayerType(int, android.graphics.Paint) 11423 * @see #buildLayer() 11424 * @see #LAYER_TYPE_NONE 11425 * @see #LAYER_TYPE_SOFTWARE 11426 * @see #LAYER_TYPE_HARDWARE 11427 */ 11428 public int getLayerType() { 11429 return mLayerType; 11430 } 11431 11432 /** 11433 * Forces this view's layer to be created and this view to be rendered 11434 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11435 * invoking this method will have no effect. 11436 * 11437 * This method can for instance be used to render a view into its layer before 11438 * starting an animation. If this view is complex, rendering into the layer 11439 * before starting the animation will avoid skipping frames. 11440 * 11441 * @throws IllegalStateException If this view is not attached to a window 11442 * 11443 * @see #setLayerType(int, android.graphics.Paint) 11444 */ 11445 public void buildLayer() { 11446 if (mLayerType == LAYER_TYPE_NONE) return; 11447 11448 if (mAttachInfo == null) { 11449 throw new IllegalStateException("This view must be attached to a window first"); 11450 } 11451 11452 switch (mLayerType) { 11453 case LAYER_TYPE_HARDWARE: 11454 if (mAttachInfo.mHardwareRenderer != null && 11455 mAttachInfo.mHardwareRenderer.isEnabled() && 11456 mAttachInfo.mHardwareRenderer.validate()) { 11457 getHardwareLayer(); 11458 } 11459 break; 11460 case LAYER_TYPE_SOFTWARE: 11461 buildDrawingCache(true); 11462 break; 11463 } 11464 } 11465 11466 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11467 void flushLayer() { 11468 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11469 mHardwareLayer.flush(); 11470 } 11471 } 11472 11473 /** 11474 * <p>Returns a hardware layer that can be used to draw this view again 11475 * without executing its draw method.</p> 11476 * 11477 * @return A HardwareLayer ready to render, or null if an error occurred. 11478 */ 11479 HardwareLayer getHardwareLayer() { 11480 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11481 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11482 return null; 11483 } 11484 11485 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11486 11487 final int width = mRight - mLeft; 11488 final int height = mBottom - mTop; 11489 11490 if (width == 0 || height == 0) { 11491 return null; 11492 } 11493 11494 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11495 if (mHardwareLayer == null) { 11496 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11497 width, height, isOpaque()); 11498 mLocalDirtyRect.set(0, 0, width, height); 11499 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11500 mHardwareLayer.resize(width, height); 11501 mLocalDirtyRect.set(0, 0, width, height); 11502 } 11503 11504 // The layer is not valid if the underlying GPU resources cannot be allocated 11505 if (!mHardwareLayer.isValid()) { 11506 return null; 11507 } 11508 11509 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11510 mLocalDirtyRect.setEmpty(); 11511 } 11512 11513 return mHardwareLayer; 11514 } 11515 11516 /** 11517 * Destroys this View's hardware layer if possible. 11518 * 11519 * @return True if the layer was destroyed, false otherwise. 11520 * 11521 * @see #setLayerType(int, android.graphics.Paint) 11522 * @see #LAYER_TYPE_HARDWARE 11523 */ 11524 boolean destroyLayer(boolean valid) { 11525 if (mHardwareLayer != null) { 11526 AttachInfo info = mAttachInfo; 11527 if (info != null && info.mHardwareRenderer != null && 11528 info.mHardwareRenderer.isEnabled() && 11529 (valid || info.mHardwareRenderer.validate())) { 11530 mHardwareLayer.destroy(); 11531 mHardwareLayer = null; 11532 11533 invalidate(true); 11534 invalidateParentCaches(); 11535 } 11536 return true; 11537 } 11538 return false; 11539 } 11540 11541 /** 11542 * Destroys all hardware rendering resources. This method is invoked 11543 * when the system needs to reclaim resources. Upon execution of this 11544 * method, you should free any OpenGL resources created by the view. 11545 * 11546 * Note: you <strong>must</strong> call 11547 * <code>super.destroyHardwareResources()</code> when overriding 11548 * this method. 11549 * 11550 * @hide 11551 */ 11552 protected void destroyHardwareResources() { 11553 destroyLayer(true); 11554 } 11555 11556 /** 11557 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 11558 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 11559 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 11560 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 11561 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 11562 * null.</p> 11563 * 11564 * <p>Enabling the drawing cache is similar to 11565 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 11566 * acceleration is turned off. When hardware acceleration is turned on, enabling the 11567 * drawing cache has no effect on rendering because the system uses a different mechanism 11568 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 11569 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 11570 * for information on how to enable software and hardware layers.</p> 11571 * 11572 * <p>This API can be used to manually generate 11573 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 11574 * {@link #getDrawingCache()}.</p> 11575 * 11576 * @param enabled true to enable the drawing cache, false otherwise 11577 * 11578 * @see #isDrawingCacheEnabled() 11579 * @see #getDrawingCache() 11580 * @see #buildDrawingCache() 11581 * @see #setLayerType(int, android.graphics.Paint) 11582 */ 11583 public void setDrawingCacheEnabled(boolean enabled) { 11584 mCachingFailed = false; 11585 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 11586 } 11587 11588 /** 11589 * <p>Indicates whether the drawing cache is enabled for this view.</p> 11590 * 11591 * @return true if the drawing cache is enabled 11592 * 11593 * @see #setDrawingCacheEnabled(boolean) 11594 * @see #getDrawingCache() 11595 */ 11596 @ViewDebug.ExportedProperty(category = "drawing") 11597 public boolean isDrawingCacheEnabled() { 11598 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 11599 } 11600 11601 /** 11602 * Debugging utility which recursively outputs the dirty state of a view and its 11603 * descendants. 11604 * 11605 * @hide 11606 */ 11607 @SuppressWarnings({"UnusedDeclaration"}) 11608 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 11609 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 11610 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 11611 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 11612 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 11613 if (clear) { 11614 mPrivateFlags &= clearMask; 11615 } 11616 if (this instanceof ViewGroup) { 11617 ViewGroup parent = (ViewGroup) this; 11618 final int count = parent.getChildCount(); 11619 for (int i = 0; i < count; i++) { 11620 final View child = parent.getChildAt(i); 11621 child.outputDirtyFlags(indent + " ", clear, clearMask); 11622 } 11623 } 11624 } 11625 11626 /** 11627 * This method is used by ViewGroup to cause its children to restore or recreate their 11628 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 11629 * to recreate its own display list, which would happen if it went through the normal 11630 * draw/dispatchDraw mechanisms. 11631 * 11632 * @hide 11633 */ 11634 protected void dispatchGetDisplayList() {} 11635 11636 /** 11637 * A view that is not attached or hardware accelerated cannot create a display list. 11638 * This method checks these conditions and returns the appropriate result. 11639 * 11640 * @return true if view has the ability to create a display list, false otherwise. 11641 * 11642 * @hide 11643 */ 11644 public boolean canHaveDisplayList() { 11645 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 11646 } 11647 11648 /** 11649 * @return The HardwareRenderer associated with that view or null if hardware rendering 11650 * is not supported or this this has not been attached to a window. 11651 * 11652 * @hide 11653 */ 11654 public HardwareRenderer getHardwareRenderer() { 11655 if (mAttachInfo != null) { 11656 return mAttachInfo.mHardwareRenderer; 11657 } 11658 return null; 11659 } 11660 11661 /** 11662 * Returns a DisplayList. If the incoming displayList is null, one will be created. 11663 * Otherwise, the same display list will be returned (after having been rendered into 11664 * along the way, depending on the invalidation state of the view). 11665 * 11666 * @param displayList The previous version of this displayList, could be null. 11667 * @param isLayer Whether the requester of the display list is a layer. If so, 11668 * the view will avoid creating a layer inside the resulting display list. 11669 * @return A new or reused DisplayList object. 11670 */ 11671 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 11672 if (!canHaveDisplayList()) { 11673 return null; 11674 } 11675 11676 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 11677 displayList == null || !displayList.isValid() || 11678 (!isLayer && mRecreateDisplayList))) { 11679 // Don't need to recreate the display list, just need to tell our 11680 // children to restore/recreate theirs 11681 if (displayList != null && displayList.isValid() && 11682 !isLayer && !mRecreateDisplayList) { 11683 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 11684 mPrivateFlags &= ~DIRTY_MASK; 11685 dispatchGetDisplayList(); 11686 11687 return displayList; 11688 } 11689 11690 if (!isLayer) { 11691 // If we got here, we're recreating it. Mark it as such to ensure that 11692 // we copy in child display lists into ours in drawChild() 11693 mRecreateDisplayList = true; 11694 } 11695 if (displayList == null) { 11696 final String name = getClass().getSimpleName(); 11697 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 11698 // If we're creating a new display list, make sure our parent gets invalidated 11699 // since they will need to recreate their display list to account for this 11700 // new child display list. 11701 invalidateParentCaches(); 11702 } 11703 11704 boolean caching = false; 11705 final HardwareCanvas canvas = displayList.start(); 11706 int restoreCount = 0; 11707 int width = mRight - mLeft; 11708 int height = mBottom - mTop; 11709 11710 try { 11711 canvas.setViewport(width, height); 11712 // The dirty rect should always be null for a display list 11713 canvas.onPreDraw(null); 11714 int layerType = ( 11715 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 11716 getLayerType() : LAYER_TYPE_NONE; 11717 if (!isLayer && layerType != LAYER_TYPE_NONE && USE_DISPLAY_LIST_PROPERTIES) { 11718 if (layerType == LAYER_TYPE_HARDWARE) { 11719 final HardwareLayer layer = getHardwareLayer(); 11720 if (layer != null && layer.isValid()) { 11721 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 11722 } else { 11723 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 11724 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 11725 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 11726 } 11727 caching = true; 11728 } else { 11729 buildDrawingCache(true); 11730 Bitmap cache = getDrawingCache(true); 11731 if (cache != null) { 11732 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 11733 caching = true; 11734 } 11735 } 11736 } else { 11737 11738 computeScroll(); 11739 11740 if (!USE_DISPLAY_LIST_PROPERTIES) { 11741 restoreCount = canvas.save(); 11742 } 11743 canvas.translate(-mScrollX, -mScrollY); 11744 if (!isLayer) { 11745 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 11746 mPrivateFlags &= ~DIRTY_MASK; 11747 } 11748 11749 // Fast path for layouts with no backgrounds 11750 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 11751 dispatchDraw(canvas); 11752 } else { 11753 draw(canvas); 11754 } 11755 } 11756 } finally { 11757 if (USE_DISPLAY_LIST_PROPERTIES) { 11758 canvas.restoreToCount(restoreCount); 11759 } 11760 canvas.onPostDraw(); 11761 11762 displayList.end(); 11763 if (USE_DISPLAY_LIST_PROPERTIES) { 11764 displayList.setCaching(caching); 11765 } 11766 if (isLayer && USE_DISPLAY_LIST_PROPERTIES) { 11767 displayList.setLeftTopRightBottom(0, 0, width, height); 11768 } else { 11769 setDisplayListProperties(displayList); 11770 } 11771 } 11772 } else if (!isLayer) { 11773 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 11774 mPrivateFlags &= ~DIRTY_MASK; 11775 } 11776 11777 return displayList; 11778 } 11779 11780 /** 11781 * Get the DisplayList for the HardwareLayer 11782 * 11783 * @param layer The HardwareLayer whose DisplayList we want 11784 * @return A DisplayList fopr the specified HardwareLayer 11785 */ 11786 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 11787 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 11788 layer.setDisplayList(displayList); 11789 return displayList; 11790 } 11791 11792 11793 /** 11794 * <p>Returns a display list that can be used to draw this view again 11795 * without executing its draw method.</p> 11796 * 11797 * @return A DisplayList ready to replay, or null if caching is not enabled. 11798 * 11799 * @hide 11800 */ 11801 public DisplayList getDisplayList() { 11802 mDisplayList = getDisplayList(mDisplayList, false); 11803 return mDisplayList; 11804 } 11805 11806 /** 11807 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 11808 * 11809 * @return A non-scaled bitmap representing this view or null if cache is disabled. 11810 * 11811 * @see #getDrawingCache(boolean) 11812 */ 11813 public Bitmap getDrawingCache() { 11814 return getDrawingCache(false); 11815 } 11816 11817 /** 11818 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 11819 * is null when caching is disabled. If caching is enabled and the cache is not ready, 11820 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 11821 * draw from the cache when the cache is enabled. To benefit from the cache, you must 11822 * request the drawing cache by calling this method and draw it on screen if the 11823 * returned bitmap is not null.</p> 11824 * 11825 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 11826 * this method will create a bitmap of the same size as this view. Because this bitmap 11827 * will be drawn scaled by the parent ViewGroup, the result on screen might show 11828 * scaling artifacts. To avoid such artifacts, you should call this method by setting 11829 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 11830 * size than the view. This implies that your application must be able to handle this 11831 * size.</p> 11832 * 11833 * @param autoScale Indicates whether the generated bitmap should be scaled based on 11834 * the current density of the screen when the application is in compatibility 11835 * mode. 11836 * 11837 * @return A bitmap representing this view or null if cache is disabled. 11838 * 11839 * @see #setDrawingCacheEnabled(boolean) 11840 * @see #isDrawingCacheEnabled() 11841 * @see #buildDrawingCache(boolean) 11842 * @see #destroyDrawingCache() 11843 */ 11844 public Bitmap getDrawingCache(boolean autoScale) { 11845 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 11846 return null; 11847 } 11848 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 11849 buildDrawingCache(autoScale); 11850 } 11851 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 11852 } 11853 11854 /** 11855 * <p>Frees the resources used by the drawing cache. If you call 11856 * {@link #buildDrawingCache()} manually without calling 11857 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 11858 * should cleanup the cache with this method afterwards.</p> 11859 * 11860 * @see #setDrawingCacheEnabled(boolean) 11861 * @see #buildDrawingCache() 11862 * @see #getDrawingCache() 11863 */ 11864 public void destroyDrawingCache() { 11865 if (mDrawingCache != null) { 11866 mDrawingCache.recycle(); 11867 mDrawingCache = null; 11868 } 11869 if (mUnscaledDrawingCache != null) { 11870 mUnscaledDrawingCache.recycle(); 11871 mUnscaledDrawingCache = null; 11872 } 11873 } 11874 11875 /** 11876 * Setting a solid background color for the drawing cache's bitmaps will improve 11877 * performance and memory usage. Note, though that this should only be used if this 11878 * view will always be drawn on top of a solid color. 11879 * 11880 * @param color The background color to use for the drawing cache's bitmap 11881 * 11882 * @see #setDrawingCacheEnabled(boolean) 11883 * @see #buildDrawingCache() 11884 * @see #getDrawingCache() 11885 */ 11886 public void setDrawingCacheBackgroundColor(int color) { 11887 if (color != mDrawingCacheBackgroundColor) { 11888 mDrawingCacheBackgroundColor = color; 11889 mPrivateFlags &= ~DRAWING_CACHE_VALID; 11890 } 11891 } 11892 11893 /** 11894 * @see #setDrawingCacheBackgroundColor(int) 11895 * 11896 * @return The background color to used for the drawing cache's bitmap 11897 */ 11898 public int getDrawingCacheBackgroundColor() { 11899 return mDrawingCacheBackgroundColor; 11900 } 11901 11902 /** 11903 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 11904 * 11905 * @see #buildDrawingCache(boolean) 11906 */ 11907 public void buildDrawingCache() { 11908 buildDrawingCache(false); 11909 } 11910 11911 /** 11912 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 11913 * 11914 * <p>If you call {@link #buildDrawingCache()} manually without calling 11915 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 11916 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 11917 * 11918 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 11919 * this method will create a bitmap of the same size as this view. Because this bitmap 11920 * will be drawn scaled by the parent ViewGroup, the result on screen might show 11921 * scaling artifacts. To avoid such artifacts, you should call this method by setting 11922 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 11923 * size than the view. This implies that your application must be able to handle this 11924 * size.</p> 11925 * 11926 * <p>You should avoid calling this method when hardware acceleration is enabled. If 11927 * you do not need the drawing cache bitmap, calling this method will increase memory 11928 * usage and cause the view to be rendered in software once, thus negatively impacting 11929 * performance.</p> 11930 * 11931 * @see #getDrawingCache() 11932 * @see #destroyDrawingCache() 11933 */ 11934 public void buildDrawingCache(boolean autoScale) { 11935 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 11936 mDrawingCache == null : mUnscaledDrawingCache == null)) { 11937 mCachingFailed = false; 11938 11939 if (ViewDebug.TRACE_HIERARCHY) { 11940 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 11941 } 11942 11943 int width = mRight - mLeft; 11944 int height = mBottom - mTop; 11945 11946 final AttachInfo attachInfo = mAttachInfo; 11947 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 11948 11949 if (autoScale && scalingRequired) { 11950 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 11951 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 11952 } 11953 11954 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 11955 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 11956 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 11957 11958 if (width <= 0 || height <= 0 || 11959 // Projected bitmap size in bytes 11960 (width * height * (opaque && !use32BitCache ? 2 : 4) > 11961 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 11962 destroyDrawingCache(); 11963 mCachingFailed = true; 11964 return; 11965 } 11966 11967 boolean clear = true; 11968 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 11969 11970 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 11971 Bitmap.Config quality; 11972 if (!opaque) { 11973 // Never pick ARGB_4444 because it looks awful 11974 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 11975 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 11976 case DRAWING_CACHE_QUALITY_AUTO: 11977 quality = Bitmap.Config.ARGB_8888; 11978 break; 11979 case DRAWING_CACHE_QUALITY_LOW: 11980 quality = Bitmap.Config.ARGB_8888; 11981 break; 11982 case DRAWING_CACHE_QUALITY_HIGH: 11983 quality = Bitmap.Config.ARGB_8888; 11984 break; 11985 default: 11986 quality = Bitmap.Config.ARGB_8888; 11987 break; 11988 } 11989 } else { 11990 // Optimization for translucent windows 11991 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 11992 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 11993 } 11994 11995 // Try to cleanup memory 11996 if (bitmap != null) bitmap.recycle(); 11997 11998 try { 11999 bitmap = Bitmap.createBitmap(width, height, quality); 12000 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12001 if (autoScale) { 12002 mDrawingCache = bitmap; 12003 } else { 12004 mUnscaledDrawingCache = bitmap; 12005 } 12006 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12007 } catch (OutOfMemoryError e) { 12008 // If there is not enough memory to create the bitmap cache, just 12009 // ignore the issue as bitmap caches are not required to draw the 12010 // view hierarchy 12011 if (autoScale) { 12012 mDrawingCache = null; 12013 } else { 12014 mUnscaledDrawingCache = null; 12015 } 12016 mCachingFailed = true; 12017 return; 12018 } 12019 12020 clear = drawingCacheBackgroundColor != 0; 12021 } 12022 12023 Canvas canvas; 12024 if (attachInfo != null) { 12025 canvas = attachInfo.mCanvas; 12026 if (canvas == null) { 12027 canvas = new Canvas(); 12028 } 12029 canvas.setBitmap(bitmap); 12030 // Temporarily clobber the cached Canvas in case one of our children 12031 // is also using a drawing cache. Without this, the children would 12032 // steal the canvas by attaching their own bitmap to it and bad, bad 12033 // thing would happen (invisible views, corrupted drawings, etc.) 12034 attachInfo.mCanvas = null; 12035 } else { 12036 // This case should hopefully never or seldom happen 12037 canvas = new Canvas(bitmap); 12038 } 12039 12040 if (clear) { 12041 bitmap.eraseColor(drawingCacheBackgroundColor); 12042 } 12043 12044 computeScroll(); 12045 final int restoreCount = canvas.save(); 12046 12047 if (autoScale && scalingRequired) { 12048 final float scale = attachInfo.mApplicationScale; 12049 canvas.scale(scale, scale); 12050 } 12051 12052 canvas.translate(-mScrollX, -mScrollY); 12053 12054 mPrivateFlags |= DRAWN; 12055 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12056 mLayerType != LAYER_TYPE_NONE) { 12057 mPrivateFlags |= DRAWING_CACHE_VALID; 12058 } 12059 12060 // Fast path for layouts with no backgrounds 12061 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12062 if (ViewDebug.TRACE_HIERARCHY) { 12063 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12064 } 12065 mPrivateFlags &= ~DIRTY_MASK; 12066 dispatchDraw(canvas); 12067 } else { 12068 draw(canvas); 12069 } 12070 12071 canvas.restoreToCount(restoreCount); 12072 canvas.setBitmap(null); 12073 12074 if (attachInfo != null) { 12075 // Restore the cached Canvas for our siblings 12076 attachInfo.mCanvas = canvas; 12077 } 12078 } 12079 } 12080 12081 /** 12082 * Create a snapshot of the view into a bitmap. We should probably make 12083 * some form of this public, but should think about the API. 12084 */ 12085 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12086 int width = mRight - mLeft; 12087 int height = mBottom - mTop; 12088 12089 final AttachInfo attachInfo = mAttachInfo; 12090 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12091 width = (int) ((width * scale) + 0.5f); 12092 height = (int) ((height * scale) + 0.5f); 12093 12094 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12095 if (bitmap == null) { 12096 throw new OutOfMemoryError(); 12097 } 12098 12099 Resources resources = getResources(); 12100 if (resources != null) { 12101 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12102 } 12103 12104 Canvas canvas; 12105 if (attachInfo != null) { 12106 canvas = attachInfo.mCanvas; 12107 if (canvas == null) { 12108 canvas = new Canvas(); 12109 } 12110 canvas.setBitmap(bitmap); 12111 // Temporarily clobber the cached Canvas in case one of our children 12112 // is also using a drawing cache. Without this, the children would 12113 // steal the canvas by attaching their own bitmap to it and bad, bad 12114 // things would happen (invisible views, corrupted drawings, etc.) 12115 attachInfo.mCanvas = null; 12116 } else { 12117 // This case should hopefully never or seldom happen 12118 canvas = new Canvas(bitmap); 12119 } 12120 12121 if ((backgroundColor & 0xff000000) != 0) { 12122 bitmap.eraseColor(backgroundColor); 12123 } 12124 12125 computeScroll(); 12126 final int restoreCount = canvas.save(); 12127 canvas.scale(scale, scale); 12128 canvas.translate(-mScrollX, -mScrollY); 12129 12130 // Temporarily remove the dirty mask 12131 int flags = mPrivateFlags; 12132 mPrivateFlags &= ~DIRTY_MASK; 12133 12134 // Fast path for layouts with no backgrounds 12135 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12136 dispatchDraw(canvas); 12137 } else { 12138 draw(canvas); 12139 } 12140 12141 mPrivateFlags = flags; 12142 12143 canvas.restoreToCount(restoreCount); 12144 canvas.setBitmap(null); 12145 12146 if (attachInfo != null) { 12147 // Restore the cached Canvas for our siblings 12148 attachInfo.mCanvas = canvas; 12149 } 12150 12151 return bitmap; 12152 } 12153 12154 /** 12155 * Indicates whether this View is currently in edit mode. A View is usually 12156 * in edit mode when displayed within a developer tool. For instance, if 12157 * this View is being drawn by a visual user interface builder, this method 12158 * should return true. 12159 * 12160 * Subclasses should check the return value of this method to provide 12161 * different behaviors if their normal behavior might interfere with the 12162 * host environment. For instance: the class spawns a thread in its 12163 * constructor, the drawing code relies on device-specific features, etc. 12164 * 12165 * This method is usually checked in the drawing code of custom widgets. 12166 * 12167 * @return True if this View is in edit mode, false otherwise. 12168 */ 12169 public boolean isInEditMode() { 12170 return false; 12171 } 12172 12173 /** 12174 * If the View draws content inside its padding and enables fading edges, 12175 * it needs to support padding offsets. Padding offsets are added to the 12176 * fading edges to extend the length of the fade so that it covers pixels 12177 * drawn inside the padding. 12178 * 12179 * Subclasses of this class should override this method if they need 12180 * to draw content inside the padding. 12181 * 12182 * @return True if padding offset must be applied, false otherwise. 12183 * 12184 * @see #getLeftPaddingOffset() 12185 * @see #getRightPaddingOffset() 12186 * @see #getTopPaddingOffset() 12187 * @see #getBottomPaddingOffset() 12188 * 12189 * @since CURRENT 12190 */ 12191 protected boolean isPaddingOffsetRequired() { 12192 return false; 12193 } 12194 12195 /** 12196 * Amount by which to extend the left fading region. Called only when 12197 * {@link #isPaddingOffsetRequired()} returns true. 12198 * 12199 * @return The left padding offset in pixels. 12200 * 12201 * @see #isPaddingOffsetRequired() 12202 * 12203 * @since CURRENT 12204 */ 12205 protected int getLeftPaddingOffset() { 12206 return 0; 12207 } 12208 12209 /** 12210 * Amount by which to extend the right fading region. Called only when 12211 * {@link #isPaddingOffsetRequired()} returns true. 12212 * 12213 * @return The right padding offset in pixels. 12214 * 12215 * @see #isPaddingOffsetRequired() 12216 * 12217 * @since CURRENT 12218 */ 12219 protected int getRightPaddingOffset() { 12220 return 0; 12221 } 12222 12223 /** 12224 * Amount by which to extend the top fading region. Called only when 12225 * {@link #isPaddingOffsetRequired()} returns true. 12226 * 12227 * @return The top padding offset in pixels. 12228 * 12229 * @see #isPaddingOffsetRequired() 12230 * 12231 * @since CURRENT 12232 */ 12233 protected int getTopPaddingOffset() { 12234 return 0; 12235 } 12236 12237 /** 12238 * Amount by which to extend the bottom fading region. Called only when 12239 * {@link #isPaddingOffsetRequired()} returns true. 12240 * 12241 * @return The bottom padding offset in pixels. 12242 * 12243 * @see #isPaddingOffsetRequired() 12244 * 12245 * @since CURRENT 12246 */ 12247 protected int getBottomPaddingOffset() { 12248 return 0; 12249 } 12250 12251 /** 12252 * @hide 12253 * @param offsetRequired 12254 */ 12255 protected int getFadeTop(boolean offsetRequired) { 12256 int top = mPaddingTop; 12257 if (offsetRequired) top += getTopPaddingOffset(); 12258 return top; 12259 } 12260 12261 /** 12262 * @hide 12263 * @param offsetRequired 12264 */ 12265 protected int getFadeHeight(boolean offsetRequired) { 12266 int padding = mPaddingTop; 12267 if (offsetRequired) padding += getTopPaddingOffset(); 12268 return mBottom - mTop - mPaddingBottom - padding; 12269 } 12270 12271 /** 12272 * <p>Indicates whether this view is attached to a hardware accelerated 12273 * window or not.</p> 12274 * 12275 * <p>Even if this method returns true, it does not mean that every call 12276 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12277 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12278 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12279 * window is hardware accelerated, 12280 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12281 * return false, and this method will return true.</p> 12282 * 12283 * @return True if the view is attached to a window and the window is 12284 * hardware accelerated; false in any other case. 12285 */ 12286 public boolean isHardwareAccelerated() { 12287 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12288 } 12289 12290 /** 12291 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12292 * case of an active Animation being run on the view. 12293 */ 12294 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12295 Animation a, boolean scalingRequired) { 12296 Transformation invalidationTransform; 12297 final int flags = parent.mGroupFlags; 12298 final boolean initialized = a.isInitialized(); 12299 if (!initialized) { 12300 a.initialize(mRight - mLeft, mBottom - mTop, getWidth(), getHeight()); 12301 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12302 onAnimationStart(); 12303 } 12304 12305 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12306 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12307 if (parent.mInvalidationTransformation == null) { 12308 parent.mInvalidationTransformation = new Transformation(); 12309 } 12310 invalidationTransform = parent.mInvalidationTransformation; 12311 a.getTransformation(drawingTime, invalidationTransform, 1f); 12312 } else { 12313 invalidationTransform = parent.mChildTransformation; 12314 } 12315 if (more) { 12316 if (!a.willChangeBounds()) { 12317 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12318 parent.FLAG_OPTIMIZE_INVALIDATE) { 12319 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12320 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12321 // The child need to draw an animation, potentially offscreen, so 12322 // make sure we do not cancel invalidate requests 12323 parent.mPrivateFlags |= DRAW_ANIMATION; 12324 parent.invalidate(mLeft, mTop, mRight, mBottom); 12325 } 12326 } else { 12327 if (parent.mInvalidateRegion == null) { 12328 parent.mInvalidateRegion = new RectF(); 12329 } 12330 final RectF region = parent.mInvalidateRegion; 12331 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12332 invalidationTransform); 12333 12334 // The child need to draw an animation, potentially offscreen, so 12335 // make sure we do not cancel invalidate requests 12336 parent.mPrivateFlags |= DRAW_ANIMATION; 12337 12338 final int left = mLeft + (int) region.left; 12339 final int top = mTop + (int) region.top; 12340 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12341 top + (int) (region.height() + .5f)); 12342 } 12343 } 12344 return more; 12345 } 12346 12347 void setDisplayListProperties() { 12348 setDisplayListProperties(mDisplayList); 12349 } 12350 12351 /** 12352 * This method is called by getDisplayList() when a display list is created or re-rendered. 12353 * It sets or resets the current value of all properties on that display list (resetting is 12354 * necessary when a display list is being re-created, because we need to make sure that 12355 * previously-set transform values 12356 */ 12357 void setDisplayListProperties(DisplayList displayList) { 12358 if (USE_DISPLAY_LIST_PROPERTIES && displayList != null) { 12359 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12360 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12361 if (mParent instanceof ViewGroup) { 12362 displayList.setClipChildren( 12363 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12364 } 12365 float alpha = 1; 12366 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12367 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12368 ViewGroup parentVG = (ViewGroup) mParent; 12369 final boolean hasTransform = 12370 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12371 if (hasTransform) { 12372 Transformation transform = parentVG.mChildTransformation; 12373 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12374 if (transformType != Transformation.TYPE_IDENTITY) { 12375 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12376 alpha = transform.getAlpha(); 12377 } 12378 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12379 displayList.setStaticMatrix(transform.getMatrix()); 12380 } 12381 } 12382 } 12383 } 12384 if (mTransformationInfo != null) { 12385 alpha *= mTransformationInfo.mAlpha; 12386 if (alpha < 1) { 12387 final int multipliedAlpha = (int) (255 * alpha); 12388 if (onSetAlpha(multipliedAlpha)) { 12389 alpha = 1; 12390 } 12391 } 12392 displayList.setTransformationInfo(alpha, 12393 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12394 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12395 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12396 mTransformationInfo.mScaleY); 12397 if (mTransformationInfo.mCamera == null) { 12398 mTransformationInfo.mCamera = new Camera(); 12399 mTransformationInfo.matrix3D = new Matrix(); 12400 } 12401 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12402 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12403 displayList.setPivotX(getPivotX()); 12404 displayList.setPivotY(getPivotY()); 12405 } 12406 } else if (alpha < 1) { 12407 displayList.setAlpha(alpha); 12408 } 12409 } 12410 } 12411 12412 /** 12413 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12414 * This draw() method is an implementation detail and is not intended to be overridden or 12415 * to be called from anywhere else other than ViewGroup.drawChild(). 12416 */ 12417 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12418 boolean useDisplayListProperties = USE_DISPLAY_LIST_PROPERTIES && mAttachInfo != null && 12419 mAttachInfo.mHardwareAccelerated; 12420 boolean more = false; 12421 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12422 final int flags = parent.mGroupFlags; 12423 12424 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12425 parent.mChildTransformation.clear(); 12426 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12427 } 12428 12429 Transformation transformToApply = null; 12430 boolean concatMatrix = false; 12431 12432 boolean scalingRequired = false; 12433 boolean caching; 12434 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 12435 12436 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12437 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12438 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12439 caching = true; 12440 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12441 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12442 } else { 12443 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12444 } 12445 12446 final Animation a = getAnimation(); 12447 if (a != null) { 12448 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12449 concatMatrix = a.willChangeTransformationMatrix(); 12450 transformToApply = parent.mChildTransformation; 12451 } else if (!useDisplayListProperties && 12452 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12453 final boolean hasTransform = 12454 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12455 if (hasTransform) { 12456 final int transformType = parent.mChildTransformation.getTransformationType(); 12457 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12458 parent.mChildTransformation : null; 12459 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12460 } 12461 } 12462 12463 concatMatrix |= !childHasIdentityMatrix; 12464 12465 // Sets the flag as early as possible to allow draw() implementations 12466 // to call invalidate() successfully when doing animations 12467 mPrivateFlags |= DRAWN; 12468 12469 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12470 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12471 return more; 12472 } 12473 12474 if (hardwareAccelerated) { 12475 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12476 // retain the flag's value temporarily in the mRecreateDisplayList flag 12477 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12478 mPrivateFlags &= ~INVALIDATED; 12479 } 12480 12481 computeScroll(); 12482 12483 final int sx = mScrollX; 12484 final int sy = mScrollY; 12485 12486 DisplayList displayList = null; 12487 Bitmap cache = null; 12488 boolean hasDisplayList = false; 12489 if (caching) { 12490 if (!hardwareAccelerated) { 12491 if (layerType != LAYER_TYPE_NONE) { 12492 layerType = LAYER_TYPE_SOFTWARE; 12493 buildDrawingCache(true); 12494 } 12495 cache = getDrawingCache(true); 12496 } else { 12497 switch (layerType) { 12498 case LAYER_TYPE_SOFTWARE: 12499 if (useDisplayListProperties) { 12500 hasDisplayList = canHaveDisplayList(); 12501 } else { 12502 buildDrawingCache(true); 12503 cache = getDrawingCache(true); 12504 } 12505 break; 12506 case LAYER_TYPE_HARDWARE: 12507 if (useDisplayListProperties) { 12508 hasDisplayList = canHaveDisplayList(); 12509 } 12510 break; 12511 case LAYER_TYPE_NONE: 12512 // Delay getting the display list until animation-driven alpha values are 12513 // set up and possibly passed on to the view 12514 hasDisplayList = canHaveDisplayList(); 12515 break; 12516 } 12517 } 12518 } 12519 useDisplayListProperties &= hasDisplayList; 12520 if (useDisplayListProperties) { 12521 displayList = getDisplayList(); 12522 if (!displayList.isValid()) { 12523 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12524 // to getDisplayList(), the display list will be marked invalid and we should not 12525 // try to use it again. 12526 displayList = null; 12527 hasDisplayList = false; 12528 useDisplayListProperties = false; 12529 } 12530 } 12531 12532 final boolean hasNoCache = cache == null || hasDisplayList; 12533 final boolean offsetForScroll = cache == null && !hasDisplayList && 12534 layerType != LAYER_TYPE_HARDWARE; 12535 12536 int restoreTo = -1; 12537 if (!useDisplayListProperties || transformToApply != null) { 12538 restoreTo = canvas.save(); 12539 } 12540 if (offsetForScroll) { 12541 canvas.translate(mLeft - sx, mTop - sy); 12542 } else { 12543 if (!useDisplayListProperties) { 12544 canvas.translate(mLeft, mTop); 12545 } 12546 if (scalingRequired) { 12547 if (useDisplayListProperties) { 12548 // TODO: Might not need this if we put everything inside the DL 12549 restoreTo = canvas.save(); 12550 } 12551 // mAttachInfo cannot be null, otherwise scalingRequired == false 12552 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12553 canvas.scale(scale, scale); 12554 } 12555 } 12556 12557 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12558 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix()) { 12559 if (transformToApply != null || !childHasIdentityMatrix) { 12560 int transX = 0; 12561 int transY = 0; 12562 12563 if (offsetForScroll) { 12564 transX = -sx; 12565 transY = -sy; 12566 } 12567 12568 if (transformToApply != null) { 12569 if (concatMatrix) { 12570 if (useDisplayListProperties) { 12571 displayList.setAnimationMatrix(transformToApply.getMatrix()); 12572 } else { 12573 // Undo the scroll translation, apply the transformation matrix, 12574 // then redo the scroll translate to get the correct result. 12575 canvas.translate(-transX, -transY); 12576 canvas.concat(transformToApply.getMatrix()); 12577 canvas.translate(transX, transY); 12578 } 12579 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12580 } 12581 12582 float transformAlpha = transformToApply.getAlpha(); 12583 if (transformAlpha < 1) { 12584 alpha *= transformToApply.getAlpha(); 12585 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12586 } 12587 } 12588 12589 if (!childHasIdentityMatrix && !useDisplayListProperties) { 12590 canvas.translate(-transX, -transY); 12591 canvas.concat(getMatrix()); 12592 canvas.translate(transX, transY); 12593 } 12594 } 12595 12596 if (alpha < 1) { 12597 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12598 if (hasNoCache) { 12599 final int multipliedAlpha = (int) (255 * alpha); 12600 if (!onSetAlpha(multipliedAlpha)) { 12601 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 12602 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 12603 layerType != LAYER_TYPE_NONE) { 12604 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 12605 } 12606 if (useDisplayListProperties) { 12607 displayList.setAlpha(alpha * getAlpha()); 12608 } else if (layerType == LAYER_TYPE_NONE) { 12609 final int scrollX = hasDisplayList ? 0 : sx; 12610 final int scrollY = hasDisplayList ? 0 : sy; 12611 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 12612 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 12613 } 12614 } else { 12615 // Alpha is handled by the child directly, clobber the layer's alpha 12616 mPrivateFlags |= ALPHA_SET; 12617 } 12618 } 12619 } 12620 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 12621 onSetAlpha(255); 12622 mPrivateFlags &= ~ALPHA_SET; 12623 } 12624 12625 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 12626 !useDisplayListProperties) { 12627 if (offsetForScroll) { 12628 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 12629 } else { 12630 if (!scalingRequired || cache == null) { 12631 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 12632 } else { 12633 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 12634 } 12635 } 12636 } 12637 12638 if (!useDisplayListProperties && hasDisplayList) { 12639 displayList = getDisplayList(); 12640 if (!displayList.isValid()) { 12641 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12642 // to getDisplayList(), the display list will be marked invalid and we should not 12643 // try to use it again. 12644 displayList = null; 12645 hasDisplayList = false; 12646 } 12647 } 12648 12649 if (hasNoCache) { 12650 boolean layerRendered = false; 12651 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 12652 final HardwareLayer layer = getHardwareLayer(); 12653 if (layer != null && layer.isValid()) { 12654 mLayerPaint.setAlpha((int) (alpha * 255)); 12655 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 12656 layerRendered = true; 12657 } else { 12658 final int scrollX = hasDisplayList ? 0 : sx; 12659 final int scrollY = hasDisplayList ? 0 : sy; 12660 canvas.saveLayer(scrollX, scrollY, 12661 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 12662 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12663 } 12664 } 12665 12666 if (!layerRendered) { 12667 if (!hasDisplayList) { 12668 // Fast path for layouts with no backgrounds 12669 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12670 if (ViewDebug.TRACE_HIERARCHY) { 12671 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 12672 } 12673 mPrivateFlags &= ~DIRTY_MASK; 12674 dispatchDraw(canvas); 12675 } else { 12676 draw(canvas); 12677 } 12678 } else { 12679 mPrivateFlags &= ~DIRTY_MASK; 12680 ((HardwareCanvas) canvas).drawDisplayList(displayList, 12681 mRight - mLeft, mBottom - mTop, null, flags); 12682 } 12683 } 12684 } else if (cache != null) { 12685 mPrivateFlags &= ~DIRTY_MASK; 12686 Paint cachePaint; 12687 12688 if (layerType == LAYER_TYPE_NONE) { 12689 cachePaint = parent.mCachePaint; 12690 if (cachePaint == null) { 12691 cachePaint = new Paint(); 12692 cachePaint.setDither(false); 12693 parent.mCachePaint = cachePaint; 12694 } 12695 if (alpha < 1) { 12696 cachePaint.setAlpha((int) (alpha * 255)); 12697 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 12698 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 12699 cachePaint.setAlpha(255); 12700 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 12701 } 12702 } else { 12703 cachePaint = mLayerPaint; 12704 cachePaint.setAlpha((int) (alpha * 255)); 12705 } 12706 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 12707 } 12708 12709 if (restoreTo >= 0) { 12710 canvas.restoreToCount(restoreTo); 12711 } 12712 12713 if (a != null && !more) { 12714 if (!hardwareAccelerated && !a.getFillAfter()) { 12715 onSetAlpha(255); 12716 } 12717 parent.finishAnimatingView(this, a); 12718 } 12719 12720 if (more && hardwareAccelerated) { 12721 // invalidation is the trigger to recreate display lists, so if we're using 12722 // display lists to render, force an invalidate to allow the animation to 12723 // continue drawing another frame 12724 parent.invalidate(true); 12725 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 12726 // alpha animations should cause the child to recreate its display list 12727 invalidate(true); 12728 } 12729 } 12730 12731 mRecreateDisplayList = false; 12732 12733 return more; 12734 } 12735 12736 /** 12737 * Manually render this view (and all of its children) to the given Canvas. 12738 * The view must have already done a full layout before this function is 12739 * called. When implementing a view, implement 12740 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 12741 * If you do need to override this method, call the superclass version. 12742 * 12743 * @param canvas The Canvas to which the View is rendered. 12744 */ 12745 public void draw(Canvas canvas) { 12746 if (ViewDebug.TRACE_HIERARCHY) { 12747 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12748 } 12749 12750 final int privateFlags = mPrivateFlags; 12751 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 12752 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 12753 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 12754 12755 /* 12756 * Draw traversal performs several drawing steps which must be executed 12757 * in the appropriate order: 12758 * 12759 * 1. Draw the background 12760 * 2. If necessary, save the canvas' layers to prepare for fading 12761 * 3. Draw view's content 12762 * 4. Draw children 12763 * 5. If necessary, draw the fading edges and restore layers 12764 * 6. Draw decorations (scrollbars for instance) 12765 */ 12766 12767 // Step 1, draw the background, if needed 12768 int saveCount; 12769 12770 if (!dirtyOpaque) { 12771 final Drawable background = mBackground; 12772 if (background != null) { 12773 final int scrollX = mScrollX; 12774 final int scrollY = mScrollY; 12775 12776 if (mBackgroundSizeChanged) { 12777 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 12778 mBackgroundSizeChanged = false; 12779 } 12780 12781 if ((scrollX | scrollY) == 0) { 12782 background.draw(canvas); 12783 } else { 12784 canvas.translate(scrollX, scrollY); 12785 background.draw(canvas); 12786 canvas.translate(-scrollX, -scrollY); 12787 } 12788 } 12789 } 12790 12791 // skip step 2 & 5 if possible (common case) 12792 final int viewFlags = mViewFlags; 12793 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 12794 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 12795 if (!verticalEdges && !horizontalEdges) { 12796 // Step 3, draw the content 12797 if (!dirtyOpaque) onDraw(canvas); 12798 12799 // Step 4, draw the children 12800 dispatchDraw(canvas); 12801 12802 // Step 6, draw decorations (scrollbars) 12803 onDrawScrollBars(canvas); 12804 12805 // we're done... 12806 return; 12807 } 12808 12809 /* 12810 * Here we do the full fledged routine... 12811 * (this is an uncommon case where speed matters less, 12812 * this is why we repeat some of the tests that have been 12813 * done above) 12814 */ 12815 12816 boolean drawTop = false; 12817 boolean drawBottom = false; 12818 boolean drawLeft = false; 12819 boolean drawRight = false; 12820 12821 float topFadeStrength = 0.0f; 12822 float bottomFadeStrength = 0.0f; 12823 float leftFadeStrength = 0.0f; 12824 float rightFadeStrength = 0.0f; 12825 12826 // Step 2, save the canvas' layers 12827 int paddingLeft = mPaddingLeft; 12828 12829 final boolean offsetRequired = isPaddingOffsetRequired(); 12830 if (offsetRequired) { 12831 paddingLeft += getLeftPaddingOffset(); 12832 } 12833 12834 int left = mScrollX + paddingLeft; 12835 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 12836 int top = mScrollY + getFadeTop(offsetRequired); 12837 int bottom = top + getFadeHeight(offsetRequired); 12838 12839 if (offsetRequired) { 12840 right += getRightPaddingOffset(); 12841 bottom += getBottomPaddingOffset(); 12842 } 12843 12844 final ScrollabilityCache scrollabilityCache = mScrollCache; 12845 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 12846 int length = (int) fadeHeight; 12847 12848 // clip the fade length if top and bottom fades overlap 12849 // overlapping fades produce odd-looking artifacts 12850 if (verticalEdges && (top + length > bottom - length)) { 12851 length = (bottom - top) / 2; 12852 } 12853 12854 // also clip horizontal fades if necessary 12855 if (horizontalEdges && (left + length > right - length)) { 12856 length = (right - left) / 2; 12857 } 12858 12859 if (verticalEdges) { 12860 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 12861 drawTop = topFadeStrength * fadeHeight > 1.0f; 12862 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 12863 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 12864 } 12865 12866 if (horizontalEdges) { 12867 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 12868 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 12869 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 12870 drawRight = rightFadeStrength * fadeHeight > 1.0f; 12871 } 12872 12873 saveCount = canvas.getSaveCount(); 12874 12875 int solidColor = getSolidColor(); 12876 if (solidColor == 0) { 12877 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 12878 12879 if (drawTop) { 12880 canvas.saveLayer(left, top, right, top + length, null, flags); 12881 } 12882 12883 if (drawBottom) { 12884 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 12885 } 12886 12887 if (drawLeft) { 12888 canvas.saveLayer(left, top, left + length, bottom, null, flags); 12889 } 12890 12891 if (drawRight) { 12892 canvas.saveLayer(right - length, top, right, bottom, null, flags); 12893 } 12894 } else { 12895 scrollabilityCache.setFadeColor(solidColor); 12896 } 12897 12898 // Step 3, draw the content 12899 if (!dirtyOpaque) onDraw(canvas); 12900 12901 // Step 4, draw the children 12902 dispatchDraw(canvas); 12903 12904 // Step 5, draw the fade effect and restore layers 12905 final Paint p = scrollabilityCache.paint; 12906 final Matrix matrix = scrollabilityCache.matrix; 12907 final Shader fade = scrollabilityCache.shader; 12908 12909 if (drawTop) { 12910 matrix.setScale(1, fadeHeight * topFadeStrength); 12911 matrix.postTranslate(left, top); 12912 fade.setLocalMatrix(matrix); 12913 canvas.drawRect(left, top, right, top + length, p); 12914 } 12915 12916 if (drawBottom) { 12917 matrix.setScale(1, fadeHeight * bottomFadeStrength); 12918 matrix.postRotate(180); 12919 matrix.postTranslate(left, bottom); 12920 fade.setLocalMatrix(matrix); 12921 canvas.drawRect(left, bottom - length, right, bottom, p); 12922 } 12923 12924 if (drawLeft) { 12925 matrix.setScale(1, fadeHeight * leftFadeStrength); 12926 matrix.postRotate(-90); 12927 matrix.postTranslate(left, top); 12928 fade.setLocalMatrix(matrix); 12929 canvas.drawRect(left, top, left + length, bottom, p); 12930 } 12931 12932 if (drawRight) { 12933 matrix.setScale(1, fadeHeight * rightFadeStrength); 12934 matrix.postRotate(90); 12935 matrix.postTranslate(right, top); 12936 fade.setLocalMatrix(matrix); 12937 canvas.drawRect(right - length, top, right, bottom, p); 12938 } 12939 12940 canvas.restoreToCount(saveCount); 12941 12942 // Step 6, draw decorations (scrollbars) 12943 onDrawScrollBars(canvas); 12944 } 12945 12946 /** 12947 * Override this if your view is known to always be drawn on top of a solid color background, 12948 * and needs to draw fading edges. Returning a non-zero color enables the view system to 12949 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 12950 * should be set to 0xFF. 12951 * 12952 * @see #setVerticalFadingEdgeEnabled(boolean) 12953 * @see #setHorizontalFadingEdgeEnabled(boolean) 12954 * 12955 * @return The known solid color background for this view, or 0 if the color may vary 12956 */ 12957 @ViewDebug.ExportedProperty(category = "drawing") 12958 public int getSolidColor() { 12959 return 0; 12960 } 12961 12962 /** 12963 * Build a human readable string representation of the specified view flags. 12964 * 12965 * @param flags the view flags to convert to a string 12966 * @return a String representing the supplied flags 12967 */ 12968 private static String printFlags(int flags) { 12969 String output = ""; 12970 int numFlags = 0; 12971 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 12972 output += "TAKES_FOCUS"; 12973 numFlags++; 12974 } 12975 12976 switch (flags & VISIBILITY_MASK) { 12977 case INVISIBLE: 12978 if (numFlags > 0) { 12979 output += " "; 12980 } 12981 output += "INVISIBLE"; 12982 // USELESS HERE numFlags++; 12983 break; 12984 case GONE: 12985 if (numFlags > 0) { 12986 output += " "; 12987 } 12988 output += "GONE"; 12989 // USELESS HERE numFlags++; 12990 break; 12991 default: 12992 break; 12993 } 12994 return output; 12995 } 12996 12997 /** 12998 * Build a human readable string representation of the specified private 12999 * view flags. 13000 * 13001 * @param privateFlags the private view flags to convert to a string 13002 * @return a String representing the supplied flags 13003 */ 13004 private static String printPrivateFlags(int privateFlags) { 13005 String output = ""; 13006 int numFlags = 0; 13007 13008 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13009 output += "WANTS_FOCUS"; 13010 numFlags++; 13011 } 13012 13013 if ((privateFlags & FOCUSED) == FOCUSED) { 13014 if (numFlags > 0) { 13015 output += " "; 13016 } 13017 output += "FOCUSED"; 13018 numFlags++; 13019 } 13020 13021 if ((privateFlags & SELECTED) == SELECTED) { 13022 if (numFlags > 0) { 13023 output += " "; 13024 } 13025 output += "SELECTED"; 13026 numFlags++; 13027 } 13028 13029 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13030 if (numFlags > 0) { 13031 output += " "; 13032 } 13033 output += "IS_ROOT_NAMESPACE"; 13034 numFlags++; 13035 } 13036 13037 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13038 if (numFlags > 0) { 13039 output += " "; 13040 } 13041 output += "HAS_BOUNDS"; 13042 numFlags++; 13043 } 13044 13045 if ((privateFlags & DRAWN) == DRAWN) { 13046 if (numFlags > 0) { 13047 output += " "; 13048 } 13049 output += "DRAWN"; 13050 // USELESS HERE numFlags++; 13051 } 13052 return output; 13053 } 13054 13055 /** 13056 * <p>Indicates whether or not this view's layout will be requested during 13057 * the next hierarchy layout pass.</p> 13058 * 13059 * @return true if the layout will be forced during next layout pass 13060 */ 13061 public boolean isLayoutRequested() { 13062 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13063 } 13064 13065 /** 13066 * Assign a size and position to a view and all of its 13067 * descendants 13068 * 13069 * <p>This is the second phase of the layout mechanism. 13070 * (The first is measuring). In this phase, each parent calls 13071 * layout on all of its children to position them. 13072 * This is typically done using the child measurements 13073 * that were stored in the measure pass().</p> 13074 * 13075 * <p>Derived classes should not override this method. 13076 * Derived classes with children should override 13077 * onLayout. In that method, they should 13078 * call layout on each of their children.</p> 13079 * 13080 * @param l Left position, relative to parent 13081 * @param t Top position, relative to parent 13082 * @param r Right position, relative to parent 13083 * @param b Bottom position, relative to parent 13084 */ 13085 @SuppressWarnings({"unchecked"}) 13086 public void layout(int l, int t, int r, int b) { 13087 int oldL = mLeft; 13088 int oldT = mTop; 13089 int oldB = mBottom; 13090 int oldR = mRight; 13091 boolean changed = setFrame(l, t, r, b); 13092 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13093 if (ViewDebug.TRACE_HIERARCHY) { 13094 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 13095 } 13096 13097 onLayout(changed, l, t, r, b); 13098 mPrivateFlags &= ~LAYOUT_REQUIRED; 13099 13100 ListenerInfo li = mListenerInfo; 13101 if (li != null && li.mOnLayoutChangeListeners != null) { 13102 ArrayList<OnLayoutChangeListener> listenersCopy = 13103 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13104 int numListeners = listenersCopy.size(); 13105 for (int i = 0; i < numListeners; ++i) { 13106 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13107 } 13108 } 13109 } 13110 mPrivateFlags &= ~FORCE_LAYOUT; 13111 } 13112 13113 /** 13114 * Called from layout when this view should 13115 * assign a size and position to each of its children. 13116 * 13117 * Derived classes with children should override 13118 * this method and call layout on each of 13119 * their children. 13120 * @param changed This is a new size or position for this view 13121 * @param left Left position, relative to parent 13122 * @param top Top position, relative to parent 13123 * @param right Right position, relative to parent 13124 * @param bottom Bottom position, relative to parent 13125 */ 13126 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13127 } 13128 13129 /** 13130 * Assign a size and position to this view. 13131 * 13132 * This is called from layout. 13133 * 13134 * @param left Left position, relative to parent 13135 * @param top Top position, relative to parent 13136 * @param right Right position, relative to parent 13137 * @param bottom Bottom position, relative to parent 13138 * @return true if the new size and position are different than the 13139 * previous ones 13140 * {@hide} 13141 */ 13142 protected boolean setFrame(int left, int top, int right, int bottom) { 13143 boolean changed = false; 13144 13145 if (DBG) { 13146 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13147 + right + "," + bottom + ")"); 13148 } 13149 13150 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13151 changed = true; 13152 13153 // Remember our drawn bit 13154 int drawn = mPrivateFlags & DRAWN; 13155 13156 int oldWidth = mRight - mLeft; 13157 int oldHeight = mBottom - mTop; 13158 int newWidth = right - left; 13159 int newHeight = bottom - top; 13160 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13161 13162 // Invalidate our old position 13163 invalidate(sizeChanged); 13164 13165 mLeft = left; 13166 mTop = top; 13167 mRight = right; 13168 mBottom = bottom; 13169 if (USE_DISPLAY_LIST_PROPERTIES && mDisplayList != null) { 13170 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13171 } 13172 13173 mPrivateFlags |= HAS_BOUNDS; 13174 13175 13176 if (sizeChanged) { 13177 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13178 // A change in dimension means an auto-centered pivot point changes, too 13179 if (mTransformationInfo != null) { 13180 mTransformationInfo.mMatrixDirty = true; 13181 } 13182 } 13183 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13184 } 13185 13186 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13187 // If we are visible, force the DRAWN bit to on so that 13188 // this invalidate will go through (at least to our parent). 13189 // This is because someone may have invalidated this view 13190 // before this call to setFrame came in, thereby clearing 13191 // the DRAWN bit. 13192 mPrivateFlags |= DRAWN; 13193 invalidate(sizeChanged); 13194 // parent display list may need to be recreated based on a change in the bounds 13195 // of any child 13196 invalidateParentCaches(); 13197 } 13198 13199 // Reset drawn bit to original value (invalidate turns it off) 13200 mPrivateFlags |= drawn; 13201 13202 mBackgroundSizeChanged = true; 13203 } 13204 return changed; 13205 } 13206 13207 /** 13208 * Finalize inflating a view from XML. This is called as the last phase 13209 * of inflation, after all child views have been added. 13210 * 13211 * <p>Even if the subclass overrides onFinishInflate, they should always be 13212 * sure to call the super method, so that we get called. 13213 */ 13214 protected void onFinishInflate() { 13215 } 13216 13217 /** 13218 * Returns the resources associated with this view. 13219 * 13220 * @return Resources object. 13221 */ 13222 public Resources getResources() { 13223 return mResources; 13224 } 13225 13226 /** 13227 * Invalidates the specified Drawable. 13228 * 13229 * @param drawable the drawable to invalidate 13230 */ 13231 public void invalidateDrawable(Drawable drawable) { 13232 if (verifyDrawable(drawable)) { 13233 final Rect dirty = drawable.getBounds(); 13234 final int scrollX = mScrollX; 13235 final int scrollY = mScrollY; 13236 13237 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13238 dirty.right + scrollX, dirty.bottom + scrollY); 13239 } 13240 } 13241 13242 /** 13243 * Schedules an action on a drawable to occur at a specified time. 13244 * 13245 * @param who the recipient of the action 13246 * @param what the action to run on the drawable 13247 * @param when the time at which the action must occur. Uses the 13248 * {@link SystemClock#uptimeMillis} timebase. 13249 */ 13250 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13251 if (verifyDrawable(who) && what != null) { 13252 final long delay = when - SystemClock.uptimeMillis(); 13253 if (mAttachInfo != null) { 13254 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13255 Choreographer.CALLBACK_ANIMATION, what, who, 13256 Choreographer.subtractFrameDelay(delay)); 13257 } else { 13258 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13259 } 13260 } 13261 } 13262 13263 /** 13264 * Cancels a scheduled action on a drawable. 13265 * 13266 * @param who the recipient of the action 13267 * @param what the action to cancel 13268 */ 13269 public void unscheduleDrawable(Drawable who, Runnable what) { 13270 if (verifyDrawable(who) && what != null) { 13271 if (mAttachInfo != null) { 13272 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13273 Choreographer.CALLBACK_ANIMATION, what, who); 13274 } else { 13275 ViewRootImpl.getRunQueue().removeCallbacks(what); 13276 } 13277 } 13278 } 13279 13280 /** 13281 * Unschedule any events associated with the given Drawable. This can be 13282 * used when selecting a new Drawable into a view, so that the previous 13283 * one is completely unscheduled. 13284 * 13285 * @param who The Drawable to unschedule. 13286 * 13287 * @see #drawableStateChanged 13288 */ 13289 public void unscheduleDrawable(Drawable who) { 13290 if (mAttachInfo != null && who != null) { 13291 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13292 Choreographer.CALLBACK_ANIMATION, null, who); 13293 } 13294 } 13295 13296 /** 13297 * Return the layout direction of a given Drawable. 13298 * 13299 * @param who the Drawable to query 13300 */ 13301 public int getResolvedLayoutDirection(Drawable who) { 13302 return (who == mBackground) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 13303 } 13304 13305 /** 13306 * If your view subclass is displaying its own Drawable objects, it should 13307 * override this function and return true for any Drawable it is 13308 * displaying. This allows animations for those drawables to be 13309 * scheduled. 13310 * 13311 * <p>Be sure to call through to the super class when overriding this 13312 * function. 13313 * 13314 * @param who The Drawable to verify. Return true if it is one you are 13315 * displaying, else return the result of calling through to the 13316 * super class. 13317 * 13318 * @return boolean If true than the Drawable is being displayed in the 13319 * view; else false and it is not allowed to animate. 13320 * 13321 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13322 * @see #drawableStateChanged() 13323 */ 13324 protected boolean verifyDrawable(Drawable who) { 13325 return who == mBackground; 13326 } 13327 13328 /** 13329 * This function is called whenever the state of the view changes in such 13330 * a way that it impacts the state of drawables being shown. 13331 * 13332 * <p>Be sure to call through to the superclass when overriding this 13333 * function. 13334 * 13335 * @see Drawable#setState(int[]) 13336 */ 13337 protected void drawableStateChanged() { 13338 Drawable d = mBackground; 13339 if (d != null && d.isStateful()) { 13340 d.setState(getDrawableState()); 13341 } 13342 } 13343 13344 /** 13345 * Call this to force a view to update its drawable state. This will cause 13346 * drawableStateChanged to be called on this view. Views that are interested 13347 * in the new state should call getDrawableState. 13348 * 13349 * @see #drawableStateChanged 13350 * @see #getDrawableState 13351 */ 13352 public void refreshDrawableState() { 13353 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13354 drawableStateChanged(); 13355 13356 ViewParent parent = mParent; 13357 if (parent != null) { 13358 parent.childDrawableStateChanged(this); 13359 } 13360 } 13361 13362 /** 13363 * Return an array of resource IDs of the drawable states representing the 13364 * current state of the view. 13365 * 13366 * @return The current drawable state 13367 * 13368 * @see Drawable#setState(int[]) 13369 * @see #drawableStateChanged() 13370 * @see #onCreateDrawableState(int) 13371 */ 13372 public final int[] getDrawableState() { 13373 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13374 return mDrawableState; 13375 } else { 13376 mDrawableState = onCreateDrawableState(0); 13377 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13378 return mDrawableState; 13379 } 13380 } 13381 13382 /** 13383 * Generate the new {@link android.graphics.drawable.Drawable} state for 13384 * this view. This is called by the view 13385 * system when the cached Drawable state is determined to be invalid. To 13386 * retrieve the current state, you should use {@link #getDrawableState}. 13387 * 13388 * @param extraSpace if non-zero, this is the number of extra entries you 13389 * would like in the returned array in which you can place your own 13390 * states. 13391 * 13392 * @return Returns an array holding the current {@link Drawable} state of 13393 * the view. 13394 * 13395 * @see #mergeDrawableStates(int[], int[]) 13396 */ 13397 protected int[] onCreateDrawableState(int extraSpace) { 13398 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13399 mParent instanceof View) { 13400 return ((View) mParent).onCreateDrawableState(extraSpace); 13401 } 13402 13403 int[] drawableState; 13404 13405 int privateFlags = mPrivateFlags; 13406 13407 int viewStateIndex = 0; 13408 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13409 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13410 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13411 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13412 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13413 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13414 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13415 HardwareRenderer.isAvailable()) { 13416 // This is set if HW acceleration is requested, even if the current 13417 // process doesn't allow it. This is just to allow app preview 13418 // windows to better match their app. 13419 viewStateIndex |= VIEW_STATE_ACCELERATED; 13420 } 13421 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13422 13423 final int privateFlags2 = mPrivateFlags2; 13424 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13425 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13426 13427 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13428 13429 //noinspection ConstantIfStatement 13430 if (false) { 13431 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13432 Log.i("View", toString() 13433 + " pressed=" + ((privateFlags & PRESSED) != 0) 13434 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13435 + " fo=" + hasFocus() 13436 + " sl=" + ((privateFlags & SELECTED) != 0) 13437 + " wf=" + hasWindowFocus() 13438 + ": " + Arrays.toString(drawableState)); 13439 } 13440 13441 if (extraSpace == 0) { 13442 return drawableState; 13443 } 13444 13445 final int[] fullState; 13446 if (drawableState != null) { 13447 fullState = new int[drawableState.length + extraSpace]; 13448 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13449 } else { 13450 fullState = new int[extraSpace]; 13451 } 13452 13453 return fullState; 13454 } 13455 13456 /** 13457 * Merge your own state values in <var>additionalState</var> into the base 13458 * state values <var>baseState</var> that were returned by 13459 * {@link #onCreateDrawableState(int)}. 13460 * 13461 * @param baseState The base state values returned by 13462 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13463 * own additional state values. 13464 * 13465 * @param additionalState The additional state values you would like 13466 * added to <var>baseState</var>; this array is not modified. 13467 * 13468 * @return As a convenience, the <var>baseState</var> array you originally 13469 * passed into the function is returned. 13470 * 13471 * @see #onCreateDrawableState(int) 13472 */ 13473 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13474 final int N = baseState.length; 13475 int i = N - 1; 13476 while (i >= 0 && baseState[i] == 0) { 13477 i--; 13478 } 13479 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13480 return baseState; 13481 } 13482 13483 /** 13484 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13485 * on all Drawable objects associated with this view. 13486 */ 13487 public void jumpDrawablesToCurrentState() { 13488 if (mBackground != null) { 13489 mBackground.jumpToCurrentState(); 13490 } 13491 } 13492 13493 /** 13494 * Sets the background color for this view. 13495 * @param color the color of the background 13496 */ 13497 @RemotableViewMethod 13498 public void setBackgroundColor(int color) { 13499 if (mBackground instanceof ColorDrawable) { 13500 ((ColorDrawable) mBackground).setColor(color); 13501 } else { 13502 setBackground(new ColorDrawable(color)); 13503 } 13504 } 13505 13506 /** 13507 * Set the background to a given resource. The resource should refer to 13508 * a Drawable object or 0 to remove the background. 13509 * @param resid The identifier of the resource. 13510 * 13511 * @attr ref android.R.styleable#View_background 13512 */ 13513 @RemotableViewMethod 13514 public void setBackgroundResource(int resid) { 13515 if (resid != 0 && resid == mBackgroundResource) { 13516 return; 13517 } 13518 13519 Drawable d= null; 13520 if (resid != 0) { 13521 d = mResources.getDrawable(resid); 13522 } 13523 setBackground(d); 13524 13525 mBackgroundResource = resid; 13526 } 13527 13528 /** 13529 * Set the background to a given Drawable, or remove the background. If the 13530 * background has padding, this View's padding is set to the background's 13531 * padding. However, when a background is removed, this View's padding isn't 13532 * touched. If setting the padding is desired, please use 13533 * {@link #setPadding(int, int, int, int)}. 13534 * 13535 * @param background The Drawable to use as the background, or null to remove the 13536 * background 13537 */ 13538 public void setBackground(Drawable background) { 13539 //noinspection deprecation 13540 setBackgroundDrawable(background); 13541 } 13542 13543 /** 13544 * @deprecated use {@link #setBackground(Drawable)} instead 13545 */ 13546 @Deprecated 13547 public void setBackgroundDrawable(Drawable background) { 13548 if (background == mBackground) { 13549 return; 13550 } 13551 13552 boolean requestLayout = false; 13553 13554 mBackgroundResource = 0; 13555 13556 /* 13557 * Regardless of whether we're setting a new background or not, we want 13558 * to clear the previous drawable. 13559 */ 13560 if (mBackground != null) { 13561 mBackground.setCallback(null); 13562 unscheduleDrawable(mBackground); 13563 } 13564 13565 if (background != null) { 13566 Rect padding = sThreadLocal.get(); 13567 if (padding == null) { 13568 padding = new Rect(); 13569 sThreadLocal.set(padding); 13570 } 13571 if (background.getPadding(padding)) { 13572 switch (background.getResolvedLayoutDirectionSelf()) { 13573 case LAYOUT_DIRECTION_RTL: 13574 setPadding(padding.right, padding.top, padding.left, padding.bottom); 13575 break; 13576 case LAYOUT_DIRECTION_LTR: 13577 default: 13578 setPadding(padding.left, padding.top, padding.right, padding.bottom); 13579 } 13580 } 13581 13582 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 13583 // if it has a different minimum size, we should layout again 13584 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 13585 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 13586 requestLayout = true; 13587 } 13588 13589 background.setCallback(this); 13590 if (background.isStateful()) { 13591 background.setState(getDrawableState()); 13592 } 13593 background.setVisible(getVisibility() == VISIBLE, false); 13594 mBackground = background; 13595 13596 if ((mPrivateFlags & SKIP_DRAW) != 0) { 13597 mPrivateFlags &= ~SKIP_DRAW; 13598 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 13599 requestLayout = true; 13600 } 13601 } else { 13602 /* Remove the background */ 13603 mBackground = null; 13604 13605 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 13606 /* 13607 * This view ONLY drew the background before and we're removing 13608 * the background, so now it won't draw anything 13609 * (hence we SKIP_DRAW) 13610 */ 13611 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 13612 mPrivateFlags |= SKIP_DRAW; 13613 } 13614 13615 /* 13616 * When the background is set, we try to apply its padding to this 13617 * View. When the background is removed, we don't touch this View's 13618 * padding. This is noted in the Javadocs. Hence, we don't need to 13619 * requestLayout(), the invalidate() below is sufficient. 13620 */ 13621 13622 // The old background's minimum size could have affected this 13623 // View's layout, so let's requestLayout 13624 requestLayout = true; 13625 } 13626 13627 computeOpaqueFlags(); 13628 13629 if (requestLayout) { 13630 requestLayout(); 13631 } 13632 13633 mBackgroundSizeChanged = true; 13634 invalidate(true); 13635 } 13636 13637 /** 13638 * Gets the background drawable 13639 * 13640 * @return The drawable used as the background for this view, if any. 13641 * 13642 * @see #setBackground(Drawable) 13643 * 13644 * @attr ref android.R.styleable#View_background 13645 */ 13646 public Drawable getBackground() { 13647 return mBackground; 13648 } 13649 13650 /** 13651 * Sets the padding. The view may add on the space required to display 13652 * the scrollbars, depending on the style and visibility of the scrollbars. 13653 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 13654 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 13655 * from the values set in this call. 13656 * 13657 * @attr ref android.R.styleable#View_padding 13658 * @attr ref android.R.styleable#View_paddingBottom 13659 * @attr ref android.R.styleable#View_paddingLeft 13660 * @attr ref android.R.styleable#View_paddingRight 13661 * @attr ref android.R.styleable#View_paddingTop 13662 * @param left the left padding in pixels 13663 * @param top the top padding in pixels 13664 * @param right the right padding in pixels 13665 * @param bottom the bottom padding in pixels 13666 */ 13667 public void setPadding(int left, int top, int right, int bottom) { 13668 mUserPaddingStart = -1; 13669 mUserPaddingEnd = -1; 13670 mUserPaddingRelative = false; 13671 13672 internalSetPadding(left, top, right, bottom); 13673 } 13674 13675 private void internalSetPadding(int left, int top, int right, int bottom) { 13676 mUserPaddingLeft = left; 13677 mUserPaddingRight = right; 13678 mUserPaddingBottom = bottom; 13679 13680 final int viewFlags = mViewFlags; 13681 boolean changed = false; 13682 13683 // Common case is there are no scroll bars. 13684 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 13685 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 13686 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 13687 ? 0 : getVerticalScrollbarWidth(); 13688 switch (mVerticalScrollbarPosition) { 13689 case SCROLLBAR_POSITION_DEFAULT: 13690 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 13691 left += offset; 13692 } else { 13693 right += offset; 13694 } 13695 break; 13696 case SCROLLBAR_POSITION_RIGHT: 13697 right += offset; 13698 break; 13699 case SCROLLBAR_POSITION_LEFT: 13700 left += offset; 13701 break; 13702 } 13703 } 13704 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 13705 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 13706 ? 0 : getHorizontalScrollbarHeight(); 13707 } 13708 } 13709 13710 if (mPaddingLeft != left) { 13711 changed = true; 13712 mPaddingLeft = left; 13713 } 13714 if (mPaddingTop != top) { 13715 changed = true; 13716 mPaddingTop = top; 13717 } 13718 if (mPaddingRight != right) { 13719 changed = true; 13720 mPaddingRight = right; 13721 } 13722 if (mPaddingBottom != bottom) { 13723 changed = true; 13724 mPaddingBottom = bottom; 13725 } 13726 13727 if (changed) { 13728 requestLayout(); 13729 } 13730 } 13731 13732 /** 13733 * Sets the relative padding. The view may add on the space required to display 13734 * the scrollbars, depending on the style and visibility of the scrollbars. 13735 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 13736 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 13737 * from the values set in this call. 13738 * 13739 * @attr ref android.R.styleable#View_padding 13740 * @attr ref android.R.styleable#View_paddingBottom 13741 * @attr ref android.R.styleable#View_paddingStart 13742 * @attr ref android.R.styleable#View_paddingEnd 13743 * @attr ref android.R.styleable#View_paddingTop 13744 * @param start the start padding in pixels 13745 * @param top the top padding in pixels 13746 * @param end the end padding in pixels 13747 * @param bottom the bottom padding in pixels 13748 */ 13749 public void setPaddingRelative(int start, int top, int end, int bottom) { 13750 mUserPaddingStart = start; 13751 mUserPaddingEnd = end; 13752 mUserPaddingRelative = true; 13753 13754 switch(getResolvedLayoutDirection()) { 13755 case LAYOUT_DIRECTION_RTL: 13756 internalSetPadding(end, top, start, bottom); 13757 break; 13758 case LAYOUT_DIRECTION_LTR: 13759 default: 13760 internalSetPadding(start, top, end, bottom); 13761 } 13762 } 13763 13764 /** 13765 * Returns the top padding of this view. 13766 * 13767 * @return the top padding in pixels 13768 */ 13769 public int getPaddingTop() { 13770 return mPaddingTop; 13771 } 13772 13773 /** 13774 * Returns the bottom padding of this view. If there are inset and enabled 13775 * scrollbars, this value may include the space required to display the 13776 * scrollbars as well. 13777 * 13778 * @return the bottom padding in pixels 13779 */ 13780 public int getPaddingBottom() { 13781 return mPaddingBottom; 13782 } 13783 13784 /** 13785 * Returns the left padding of this view. If there are inset and enabled 13786 * scrollbars, this value may include the space required to display the 13787 * scrollbars as well. 13788 * 13789 * @return the left padding in pixels 13790 */ 13791 public int getPaddingLeft() { 13792 return mPaddingLeft; 13793 } 13794 13795 /** 13796 * Returns the start padding of this view depending on its resolved layout direction. 13797 * If there are inset and enabled scrollbars, this value may include the space 13798 * required to display the scrollbars as well. 13799 * 13800 * @return the start padding in pixels 13801 */ 13802 public int getPaddingStart() { 13803 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 13804 mPaddingRight : mPaddingLeft; 13805 } 13806 13807 /** 13808 * Returns the right padding of this view. If there are inset and enabled 13809 * scrollbars, this value may include the space required to display the 13810 * scrollbars as well. 13811 * 13812 * @return the right padding in pixels 13813 */ 13814 public int getPaddingRight() { 13815 return mPaddingRight; 13816 } 13817 13818 /** 13819 * Returns the end padding of this view depending on its resolved layout direction. 13820 * If there are inset and enabled scrollbars, this value may include the space 13821 * required to display the scrollbars as well. 13822 * 13823 * @return the end padding in pixels 13824 */ 13825 public int getPaddingEnd() { 13826 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 13827 mPaddingLeft : mPaddingRight; 13828 } 13829 13830 /** 13831 * Return if the padding as been set thru relative values 13832 * {@link #setPaddingRelative(int, int, int, int)} or thru 13833 * @attr ref android.R.styleable#View_paddingStart or 13834 * @attr ref android.R.styleable#View_paddingEnd 13835 * 13836 * @return true if the padding is relative or false if it is not. 13837 */ 13838 public boolean isPaddingRelative() { 13839 return mUserPaddingRelative; 13840 } 13841 13842 /** 13843 * @hide 13844 */ 13845 public Insets getLayoutInsets() { 13846 if (mLayoutInsets == null) { 13847 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 13848 } 13849 return mLayoutInsets; 13850 } 13851 13852 /** 13853 * @hide 13854 */ 13855 public void setLayoutInsets(Insets layoutInsets) { 13856 mLayoutInsets = layoutInsets; 13857 } 13858 13859 /** 13860 * Changes the selection state of this view. A view can be selected or not. 13861 * Note that selection is not the same as focus. Views are typically 13862 * selected in the context of an AdapterView like ListView or GridView; 13863 * the selected view is the view that is highlighted. 13864 * 13865 * @param selected true if the view must be selected, false otherwise 13866 */ 13867 public void setSelected(boolean selected) { 13868 if (((mPrivateFlags & SELECTED) != 0) != selected) { 13869 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 13870 if (!selected) resetPressedState(); 13871 invalidate(true); 13872 refreshDrawableState(); 13873 dispatchSetSelected(selected); 13874 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 13875 notifyAccessibilityStateChanged(); 13876 } 13877 } 13878 } 13879 13880 /** 13881 * Dispatch setSelected to all of this View's children. 13882 * 13883 * @see #setSelected(boolean) 13884 * 13885 * @param selected The new selected state 13886 */ 13887 protected void dispatchSetSelected(boolean selected) { 13888 } 13889 13890 /** 13891 * Indicates the selection state of this view. 13892 * 13893 * @return true if the view is selected, false otherwise 13894 */ 13895 @ViewDebug.ExportedProperty 13896 public boolean isSelected() { 13897 return (mPrivateFlags & SELECTED) != 0; 13898 } 13899 13900 /** 13901 * Changes the activated state of this view. A view can be activated or not. 13902 * Note that activation is not the same as selection. Selection is 13903 * a transient property, representing the view (hierarchy) the user is 13904 * currently interacting with. Activation is a longer-term state that the 13905 * user can move views in and out of. For example, in a list view with 13906 * single or multiple selection enabled, the views in the current selection 13907 * set are activated. (Um, yeah, we are deeply sorry about the terminology 13908 * here.) The activated state is propagated down to children of the view it 13909 * is set on. 13910 * 13911 * @param activated true if the view must be activated, false otherwise 13912 */ 13913 public void setActivated(boolean activated) { 13914 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 13915 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 13916 invalidate(true); 13917 refreshDrawableState(); 13918 dispatchSetActivated(activated); 13919 } 13920 } 13921 13922 /** 13923 * Dispatch setActivated to all of this View's children. 13924 * 13925 * @see #setActivated(boolean) 13926 * 13927 * @param activated The new activated state 13928 */ 13929 protected void dispatchSetActivated(boolean activated) { 13930 } 13931 13932 /** 13933 * Indicates the activation state of this view. 13934 * 13935 * @return true if the view is activated, false otherwise 13936 */ 13937 @ViewDebug.ExportedProperty 13938 public boolean isActivated() { 13939 return (mPrivateFlags & ACTIVATED) != 0; 13940 } 13941 13942 /** 13943 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 13944 * observer can be used to get notifications when global events, like 13945 * layout, happen. 13946 * 13947 * The returned ViewTreeObserver observer is not guaranteed to remain 13948 * valid for the lifetime of this View. If the caller of this method keeps 13949 * a long-lived reference to ViewTreeObserver, it should always check for 13950 * the return value of {@link ViewTreeObserver#isAlive()}. 13951 * 13952 * @return The ViewTreeObserver for this view's hierarchy. 13953 */ 13954 public ViewTreeObserver getViewTreeObserver() { 13955 if (mAttachInfo != null) { 13956 return mAttachInfo.mTreeObserver; 13957 } 13958 if (mFloatingTreeObserver == null) { 13959 mFloatingTreeObserver = new ViewTreeObserver(); 13960 } 13961 return mFloatingTreeObserver; 13962 } 13963 13964 /** 13965 * <p>Finds the topmost view in the current view hierarchy.</p> 13966 * 13967 * @return the topmost view containing this view 13968 */ 13969 public View getRootView() { 13970 if (mAttachInfo != null) { 13971 final View v = mAttachInfo.mRootView; 13972 if (v != null) { 13973 return v; 13974 } 13975 } 13976 13977 View parent = this; 13978 13979 while (parent.mParent != null && parent.mParent instanceof View) { 13980 parent = (View) parent.mParent; 13981 } 13982 13983 return parent; 13984 } 13985 13986 /** 13987 * <p>Computes the coordinates of this view on the screen. The argument 13988 * must be an array of two integers. After the method returns, the array 13989 * contains the x and y location in that order.</p> 13990 * 13991 * @param location an array of two integers in which to hold the coordinates 13992 */ 13993 public void getLocationOnScreen(int[] location) { 13994 getLocationInWindow(location); 13995 13996 final AttachInfo info = mAttachInfo; 13997 if (info != null) { 13998 location[0] += info.mWindowLeft; 13999 location[1] += info.mWindowTop; 14000 } 14001 } 14002 14003 /** 14004 * <p>Computes the coordinates of this view in its window. The argument 14005 * must be an array of two integers. After the method returns, the array 14006 * contains the x and y location in that order.</p> 14007 * 14008 * @param location an array of two integers in which to hold the coordinates 14009 */ 14010 public void getLocationInWindow(int[] location) { 14011 if (location == null || location.length < 2) { 14012 throw new IllegalArgumentException("location must be an array of two integers"); 14013 } 14014 14015 if (mAttachInfo == null) { 14016 // When the view is not attached to a window, this method does not make sense 14017 location[0] = location[1] = 0; 14018 return; 14019 } 14020 14021 float[] position = mAttachInfo.mTmpTransformLocation; 14022 position[0] = position[1] = 0.0f; 14023 14024 if (!hasIdentityMatrix()) { 14025 getMatrix().mapPoints(position); 14026 } 14027 14028 position[0] += mLeft; 14029 position[1] += mTop; 14030 14031 ViewParent viewParent = mParent; 14032 while (viewParent instanceof View) { 14033 final View view = (View) viewParent; 14034 14035 position[0] -= view.mScrollX; 14036 position[1] -= view.mScrollY; 14037 14038 if (!view.hasIdentityMatrix()) { 14039 view.getMatrix().mapPoints(position); 14040 } 14041 14042 position[0] += view.mLeft; 14043 position[1] += view.mTop; 14044 14045 viewParent = view.mParent; 14046 } 14047 14048 if (viewParent instanceof ViewRootImpl) { 14049 // *cough* 14050 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14051 position[1] -= vr.mCurScrollY; 14052 } 14053 14054 location[0] = (int) (position[0] + 0.5f); 14055 location[1] = (int) (position[1] + 0.5f); 14056 } 14057 14058 /** 14059 * {@hide} 14060 * @param id the id of the view to be found 14061 * @return the view of the specified id, null if cannot be found 14062 */ 14063 protected View findViewTraversal(int id) { 14064 if (id == mID) { 14065 return this; 14066 } 14067 return null; 14068 } 14069 14070 /** 14071 * {@hide} 14072 * @param tag the tag of the view to be found 14073 * @return the view of specified tag, null if cannot be found 14074 */ 14075 protected View findViewWithTagTraversal(Object tag) { 14076 if (tag != null && tag.equals(mTag)) { 14077 return this; 14078 } 14079 return null; 14080 } 14081 14082 /** 14083 * {@hide} 14084 * @param predicate The predicate to evaluate. 14085 * @param childToSkip If not null, ignores this child during the recursive traversal. 14086 * @return The first view that matches the predicate or null. 14087 */ 14088 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14089 if (predicate.apply(this)) { 14090 return this; 14091 } 14092 return null; 14093 } 14094 14095 /** 14096 * Look for a child view with the given id. If this view has the given 14097 * id, return this view. 14098 * 14099 * @param id The id to search for. 14100 * @return The view that has the given id in the hierarchy or null 14101 */ 14102 public final View findViewById(int id) { 14103 if (id < 0) { 14104 return null; 14105 } 14106 return findViewTraversal(id); 14107 } 14108 14109 /** 14110 * Finds a view by its unuque and stable accessibility id. 14111 * 14112 * @param accessibilityId The searched accessibility id. 14113 * @return The found view. 14114 */ 14115 final View findViewByAccessibilityId(int accessibilityId) { 14116 if (accessibilityId < 0) { 14117 return null; 14118 } 14119 return findViewByAccessibilityIdTraversal(accessibilityId); 14120 } 14121 14122 /** 14123 * Performs the traversal to find a view by its unuque and stable accessibility id. 14124 * 14125 * <strong>Note:</strong>This method does not stop at the root namespace 14126 * boundary since the user can touch the screen at an arbitrary location 14127 * potentially crossing the root namespace bounday which will send an 14128 * accessibility event to accessibility services and they should be able 14129 * to obtain the event source. Also accessibility ids are guaranteed to be 14130 * unique in the window. 14131 * 14132 * @param accessibilityId The accessibility id. 14133 * @return The found view. 14134 */ 14135 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14136 if (getAccessibilityViewId() == accessibilityId) { 14137 return this; 14138 } 14139 return null; 14140 } 14141 14142 /** 14143 * Look for a child view with the given tag. If this view has the given 14144 * tag, return this view. 14145 * 14146 * @param tag The tag to search for, using "tag.equals(getTag())". 14147 * @return The View that has the given tag in the hierarchy or null 14148 */ 14149 public final View findViewWithTag(Object tag) { 14150 if (tag == null) { 14151 return null; 14152 } 14153 return findViewWithTagTraversal(tag); 14154 } 14155 14156 /** 14157 * {@hide} 14158 * Look for a child view that matches the specified predicate. 14159 * If this view matches the predicate, return this view. 14160 * 14161 * @param predicate The predicate to evaluate. 14162 * @return The first view that matches the predicate or null. 14163 */ 14164 public final View findViewByPredicate(Predicate<View> predicate) { 14165 return findViewByPredicateTraversal(predicate, null); 14166 } 14167 14168 /** 14169 * {@hide} 14170 * Look for a child view that matches the specified predicate, 14171 * starting with the specified view and its descendents and then 14172 * recusively searching the ancestors and siblings of that view 14173 * until this view is reached. 14174 * 14175 * This method is useful in cases where the predicate does not match 14176 * a single unique view (perhaps multiple views use the same id) 14177 * and we are trying to find the view that is "closest" in scope to the 14178 * starting view. 14179 * 14180 * @param start The view to start from. 14181 * @param predicate The predicate to evaluate. 14182 * @return The first view that matches the predicate or null. 14183 */ 14184 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14185 View childToSkip = null; 14186 for (;;) { 14187 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14188 if (view != null || start == this) { 14189 return view; 14190 } 14191 14192 ViewParent parent = start.getParent(); 14193 if (parent == null || !(parent instanceof View)) { 14194 return null; 14195 } 14196 14197 childToSkip = start; 14198 start = (View) parent; 14199 } 14200 } 14201 14202 /** 14203 * Sets the identifier for this view. The identifier does not have to be 14204 * unique in this view's hierarchy. The identifier should be a positive 14205 * number. 14206 * 14207 * @see #NO_ID 14208 * @see #getId() 14209 * @see #findViewById(int) 14210 * 14211 * @param id a number used to identify the view 14212 * 14213 * @attr ref android.R.styleable#View_id 14214 */ 14215 public void setId(int id) { 14216 mID = id; 14217 } 14218 14219 /** 14220 * {@hide} 14221 * 14222 * @param isRoot true if the view belongs to the root namespace, false 14223 * otherwise 14224 */ 14225 public void setIsRootNamespace(boolean isRoot) { 14226 if (isRoot) { 14227 mPrivateFlags |= IS_ROOT_NAMESPACE; 14228 } else { 14229 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14230 } 14231 } 14232 14233 /** 14234 * {@hide} 14235 * 14236 * @return true if the view belongs to the root namespace, false otherwise 14237 */ 14238 public boolean isRootNamespace() { 14239 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14240 } 14241 14242 /** 14243 * Returns this view's identifier. 14244 * 14245 * @return a positive integer used to identify the view or {@link #NO_ID} 14246 * if the view has no ID 14247 * 14248 * @see #setId(int) 14249 * @see #findViewById(int) 14250 * @attr ref android.R.styleable#View_id 14251 */ 14252 @ViewDebug.CapturedViewProperty 14253 public int getId() { 14254 return mID; 14255 } 14256 14257 /** 14258 * Returns this view's tag. 14259 * 14260 * @return the Object stored in this view as a tag 14261 * 14262 * @see #setTag(Object) 14263 * @see #getTag(int) 14264 */ 14265 @ViewDebug.ExportedProperty 14266 public Object getTag() { 14267 return mTag; 14268 } 14269 14270 /** 14271 * Sets the tag associated with this view. A tag can be used to mark 14272 * a view in its hierarchy and does not have to be unique within the 14273 * hierarchy. Tags can also be used to store data within a view without 14274 * resorting to another data structure. 14275 * 14276 * @param tag an Object to tag the view with 14277 * 14278 * @see #getTag() 14279 * @see #setTag(int, Object) 14280 */ 14281 public void setTag(final Object tag) { 14282 mTag = tag; 14283 } 14284 14285 /** 14286 * Returns the tag associated with this view and the specified key. 14287 * 14288 * @param key The key identifying the tag 14289 * 14290 * @return the Object stored in this view as a tag 14291 * 14292 * @see #setTag(int, Object) 14293 * @see #getTag() 14294 */ 14295 public Object getTag(int key) { 14296 if (mKeyedTags != null) return mKeyedTags.get(key); 14297 return null; 14298 } 14299 14300 /** 14301 * Sets a tag associated with this view and a key. A tag can be used 14302 * to mark a view in its hierarchy and does not have to be unique within 14303 * the hierarchy. Tags can also be used to store data within a view 14304 * without resorting to another data structure. 14305 * 14306 * The specified key should be an id declared in the resources of the 14307 * application to ensure it is unique (see the <a 14308 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14309 * Keys identified as belonging to 14310 * the Android framework or not associated with any package will cause 14311 * an {@link IllegalArgumentException} to be thrown. 14312 * 14313 * @param key The key identifying the tag 14314 * @param tag An Object to tag the view with 14315 * 14316 * @throws IllegalArgumentException If they specified key is not valid 14317 * 14318 * @see #setTag(Object) 14319 * @see #getTag(int) 14320 */ 14321 public void setTag(int key, final Object tag) { 14322 // If the package id is 0x00 or 0x01, it's either an undefined package 14323 // or a framework id 14324 if ((key >>> 24) < 2) { 14325 throw new IllegalArgumentException("The key must be an application-specific " 14326 + "resource id."); 14327 } 14328 14329 setKeyedTag(key, tag); 14330 } 14331 14332 /** 14333 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14334 * framework id. 14335 * 14336 * @hide 14337 */ 14338 public void setTagInternal(int key, Object tag) { 14339 if ((key >>> 24) != 0x1) { 14340 throw new IllegalArgumentException("The key must be a framework-specific " 14341 + "resource id."); 14342 } 14343 14344 setKeyedTag(key, tag); 14345 } 14346 14347 private void setKeyedTag(int key, Object tag) { 14348 if (mKeyedTags == null) { 14349 mKeyedTags = new SparseArray<Object>(); 14350 } 14351 14352 mKeyedTags.put(key, tag); 14353 } 14354 14355 /** 14356 * @param consistency The type of consistency. See ViewDebug for more information. 14357 * 14358 * @hide 14359 */ 14360 protected boolean dispatchConsistencyCheck(int consistency) { 14361 return onConsistencyCheck(consistency); 14362 } 14363 14364 /** 14365 * Method that subclasses should implement to check their consistency. The type of 14366 * consistency check is indicated by the bit field passed as a parameter. 14367 * 14368 * @param consistency The type of consistency. See ViewDebug for more information. 14369 * 14370 * @throws IllegalStateException if the view is in an inconsistent state. 14371 * 14372 * @hide 14373 */ 14374 protected boolean onConsistencyCheck(int consistency) { 14375 boolean result = true; 14376 14377 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 14378 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 14379 14380 if (checkLayout) { 14381 if (getParent() == null) { 14382 result = false; 14383 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14384 "View " + this + " does not have a parent."); 14385 } 14386 14387 if (mAttachInfo == null) { 14388 result = false; 14389 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14390 "View " + this + " is not attached to a window."); 14391 } 14392 } 14393 14394 if (checkDrawing) { 14395 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 14396 // from their draw() method 14397 14398 if ((mPrivateFlags & DRAWN) != DRAWN && 14399 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 14400 result = false; 14401 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14402 "View " + this + " was invalidated but its drawing cache is valid."); 14403 } 14404 } 14405 14406 return result; 14407 } 14408 14409 /** 14410 * Prints information about this view in the log output, with the tag 14411 * {@link #VIEW_LOG_TAG}. 14412 * 14413 * @hide 14414 */ 14415 public void debug() { 14416 debug(0); 14417 } 14418 14419 /** 14420 * Prints information about this view in the log output, with the tag 14421 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14422 * indentation defined by the <code>depth</code>. 14423 * 14424 * @param depth the indentation level 14425 * 14426 * @hide 14427 */ 14428 protected void debug(int depth) { 14429 String output = debugIndent(depth - 1); 14430 14431 output += "+ " + this; 14432 int id = getId(); 14433 if (id != -1) { 14434 output += " (id=" + id + ")"; 14435 } 14436 Object tag = getTag(); 14437 if (tag != null) { 14438 output += " (tag=" + tag + ")"; 14439 } 14440 Log.d(VIEW_LOG_TAG, output); 14441 14442 if ((mPrivateFlags & FOCUSED) != 0) { 14443 output = debugIndent(depth) + " FOCUSED"; 14444 Log.d(VIEW_LOG_TAG, output); 14445 } 14446 14447 output = debugIndent(depth); 14448 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14449 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14450 + "} "; 14451 Log.d(VIEW_LOG_TAG, output); 14452 14453 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14454 || mPaddingBottom != 0) { 14455 output = debugIndent(depth); 14456 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14457 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14458 Log.d(VIEW_LOG_TAG, output); 14459 } 14460 14461 output = debugIndent(depth); 14462 output += "mMeasureWidth=" + mMeasuredWidth + 14463 " mMeasureHeight=" + mMeasuredHeight; 14464 Log.d(VIEW_LOG_TAG, output); 14465 14466 output = debugIndent(depth); 14467 if (mLayoutParams == null) { 14468 output += "BAD! no layout params"; 14469 } else { 14470 output = mLayoutParams.debug(output); 14471 } 14472 Log.d(VIEW_LOG_TAG, output); 14473 14474 output = debugIndent(depth); 14475 output += "flags={"; 14476 output += View.printFlags(mViewFlags); 14477 output += "}"; 14478 Log.d(VIEW_LOG_TAG, output); 14479 14480 output = debugIndent(depth); 14481 output += "privateFlags={"; 14482 output += View.printPrivateFlags(mPrivateFlags); 14483 output += "}"; 14484 Log.d(VIEW_LOG_TAG, output); 14485 } 14486 14487 /** 14488 * Creates a string of whitespaces used for indentation. 14489 * 14490 * @param depth the indentation level 14491 * @return a String containing (depth * 2 + 3) * 2 white spaces 14492 * 14493 * @hide 14494 */ 14495 protected static String debugIndent(int depth) { 14496 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14497 for (int i = 0; i < (depth * 2) + 3; i++) { 14498 spaces.append(' ').append(' '); 14499 } 14500 return spaces.toString(); 14501 } 14502 14503 /** 14504 * <p>Return the offset of the widget's text baseline from the widget's top 14505 * boundary. If this widget does not support baseline alignment, this 14506 * method returns -1. </p> 14507 * 14508 * @return the offset of the baseline within the widget's bounds or -1 14509 * if baseline alignment is not supported 14510 */ 14511 @ViewDebug.ExportedProperty(category = "layout") 14512 public int getBaseline() { 14513 return -1; 14514 } 14515 14516 /** 14517 * Call this when something has changed which has invalidated the 14518 * layout of this view. This will schedule a layout pass of the view 14519 * tree. 14520 */ 14521 public void requestLayout() { 14522 if (ViewDebug.TRACE_HIERARCHY) { 14523 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 14524 } 14525 14526 mPrivateFlags |= FORCE_LAYOUT; 14527 mPrivateFlags |= INVALIDATED; 14528 14529 if (mLayoutParams != null) { 14530 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14531 } 14532 14533 if (mParent != null && !mParent.isLayoutRequested()) { 14534 mParent.requestLayout(); 14535 } 14536 } 14537 14538 /** 14539 * Forces this view to be laid out during the next layout pass. 14540 * This method does not call requestLayout() or forceLayout() 14541 * on the parent. 14542 */ 14543 public void forceLayout() { 14544 mPrivateFlags |= FORCE_LAYOUT; 14545 mPrivateFlags |= INVALIDATED; 14546 } 14547 14548 /** 14549 * <p> 14550 * This is called to find out how big a view should be. The parent 14551 * supplies constraint information in the width and height parameters. 14552 * </p> 14553 * 14554 * <p> 14555 * The actual measurement work of a view is performed in 14556 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14557 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14558 * </p> 14559 * 14560 * 14561 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14562 * parent 14563 * @param heightMeasureSpec Vertical space requirements as imposed by the 14564 * parent 14565 * 14566 * @see #onMeasure(int, int) 14567 */ 14568 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14569 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14570 widthMeasureSpec != mOldWidthMeasureSpec || 14571 heightMeasureSpec != mOldHeightMeasureSpec) { 14572 14573 // first clears the measured dimension flag 14574 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14575 14576 if (ViewDebug.TRACE_HIERARCHY) { 14577 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 14578 } 14579 14580 // measure ourselves, this should set the measured dimension flag back 14581 onMeasure(widthMeasureSpec, heightMeasureSpec); 14582 14583 // flag not set, setMeasuredDimension() was not invoked, we raise 14584 // an exception to warn the developer 14585 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 14586 throw new IllegalStateException("onMeasure() did not set the" 14587 + " measured dimension by calling" 14588 + " setMeasuredDimension()"); 14589 } 14590 14591 mPrivateFlags |= LAYOUT_REQUIRED; 14592 } 14593 14594 mOldWidthMeasureSpec = widthMeasureSpec; 14595 mOldHeightMeasureSpec = heightMeasureSpec; 14596 } 14597 14598 /** 14599 * <p> 14600 * Measure the view and its content to determine the measured width and the 14601 * measured height. This method is invoked by {@link #measure(int, int)} and 14602 * should be overriden by subclasses to provide accurate and efficient 14603 * measurement of their contents. 14604 * </p> 14605 * 14606 * <p> 14607 * <strong>CONTRACT:</strong> When overriding this method, you 14608 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 14609 * measured width and height of this view. Failure to do so will trigger an 14610 * <code>IllegalStateException</code>, thrown by 14611 * {@link #measure(int, int)}. Calling the superclass' 14612 * {@link #onMeasure(int, int)} is a valid use. 14613 * </p> 14614 * 14615 * <p> 14616 * The base class implementation of measure defaults to the background size, 14617 * unless a larger size is allowed by the MeasureSpec. Subclasses should 14618 * override {@link #onMeasure(int, int)} to provide better measurements of 14619 * their content. 14620 * </p> 14621 * 14622 * <p> 14623 * If this method is overridden, it is the subclass's responsibility to make 14624 * sure the measured height and width are at least the view's minimum height 14625 * and width ({@link #getSuggestedMinimumHeight()} and 14626 * {@link #getSuggestedMinimumWidth()}). 14627 * </p> 14628 * 14629 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 14630 * The requirements are encoded with 14631 * {@link android.view.View.MeasureSpec}. 14632 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 14633 * The requirements are encoded with 14634 * {@link android.view.View.MeasureSpec}. 14635 * 14636 * @see #getMeasuredWidth() 14637 * @see #getMeasuredHeight() 14638 * @see #setMeasuredDimension(int, int) 14639 * @see #getSuggestedMinimumHeight() 14640 * @see #getSuggestedMinimumWidth() 14641 * @see android.view.View.MeasureSpec#getMode(int) 14642 * @see android.view.View.MeasureSpec#getSize(int) 14643 */ 14644 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 14645 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 14646 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 14647 } 14648 14649 /** 14650 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 14651 * measured width and measured height. Failing to do so will trigger an 14652 * exception at measurement time.</p> 14653 * 14654 * @param measuredWidth The measured width of this view. May be a complex 14655 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 14656 * {@link #MEASURED_STATE_TOO_SMALL}. 14657 * @param measuredHeight The measured height of this view. May be a complex 14658 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 14659 * {@link #MEASURED_STATE_TOO_SMALL}. 14660 */ 14661 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 14662 mMeasuredWidth = measuredWidth; 14663 mMeasuredHeight = measuredHeight; 14664 14665 mPrivateFlags |= MEASURED_DIMENSION_SET; 14666 } 14667 14668 /** 14669 * Merge two states as returned by {@link #getMeasuredState()}. 14670 * @param curState The current state as returned from a view or the result 14671 * of combining multiple views. 14672 * @param newState The new view state to combine. 14673 * @return Returns a new integer reflecting the combination of the two 14674 * states. 14675 */ 14676 public static int combineMeasuredStates(int curState, int newState) { 14677 return curState | newState; 14678 } 14679 14680 /** 14681 * Version of {@link #resolveSizeAndState(int, int, int)} 14682 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 14683 */ 14684 public static int resolveSize(int size, int measureSpec) { 14685 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 14686 } 14687 14688 /** 14689 * Utility to reconcile a desired size and state, with constraints imposed 14690 * by a MeasureSpec. Will take the desired size, unless a different size 14691 * is imposed by the constraints. The returned value is a compound integer, 14692 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 14693 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 14694 * size is smaller than the size the view wants to be. 14695 * 14696 * @param size How big the view wants to be 14697 * @param measureSpec Constraints imposed by the parent 14698 * @return Size information bit mask as defined by 14699 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 14700 */ 14701 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 14702 int result = size; 14703 int specMode = MeasureSpec.getMode(measureSpec); 14704 int specSize = MeasureSpec.getSize(measureSpec); 14705 switch (specMode) { 14706 case MeasureSpec.UNSPECIFIED: 14707 result = size; 14708 break; 14709 case MeasureSpec.AT_MOST: 14710 if (specSize < size) { 14711 result = specSize | MEASURED_STATE_TOO_SMALL; 14712 } else { 14713 result = size; 14714 } 14715 break; 14716 case MeasureSpec.EXACTLY: 14717 result = specSize; 14718 break; 14719 } 14720 return result | (childMeasuredState&MEASURED_STATE_MASK); 14721 } 14722 14723 /** 14724 * Utility to return a default size. Uses the supplied size if the 14725 * MeasureSpec imposed no constraints. Will get larger if allowed 14726 * by the MeasureSpec. 14727 * 14728 * @param size Default size for this view 14729 * @param measureSpec Constraints imposed by the parent 14730 * @return The size this view should be. 14731 */ 14732 public static int getDefaultSize(int size, int measureSpec) { 14733 int result = size; 14734 int specMode = MeasureSpec.getMode(measureSpec); 14735 int specSize = MeasureSpec.getSize(measureSpec); 14736 14737 switch (specMode) { 14738 case MeasureSpec.UNSPECIFIED: 14739 result = size; 14740 break; 14741 case MeasureSpec.AT_MOST: 14742 case MeasureSpec.EXACTLY: 14743 result = specSize; 14744 break; 14745 } 14746 return result; 14747 } 14748 14749 /** 14750 * Returns the suggested minimum height that the view should use. This 14751 * returns the maximum of the view's minimum height 14752 * and the background's minimum height 14753 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 14754 * <p> 14755 * When being used in {@link #onMeasure(int, int)}, the caller should still 14756 * ensure the returned height is within the requirements of the parent. 14757 * 14758 * @return The suggested minimum height of the view. 14759 */ 14760 protected int getSuggestedMinimumHeight() { 14761 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 14762 14763 } 14764 14765 /** 14766 * Returns the suggested minimum width that the view should use. This 14767 * returns the maximum of the view's minimum width) 14768 * and the background's minimum width 14769 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 14770 * <p> 14771 * When being used in {@link #onMeasure(int, int)}, the caller should still 14772 * ensure the returned width is within the requirements of the parent. 14773 * 14774 * @return The suggested minimum width of the view. 14775 */ 14776 protected int getSuggestedMinimumWidth() { 14777 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 14778 } 14779 14780 /** 14781 * Returns the minimum height of the view. 14782 * 14783 * @return the minimum height the view will try to be. 14784 * 14785 * @see #setMinimumHeight(int) 14786 * 14787 * @attr ref android.R.styleable#View_minHeight 14788 */ 14789 public int getMinimumHeight() { 14790 return mMinHeight; 14791 } 14792 14793 /** 14794 * Sets the minimum height of the view. It is not guaranteed the view will 14795 * be able to achieve this minimum height (for example, if its parent layout 14796 * constrains it with less available height). 14797 * 14798 * @param minHeight The minimum height the view will try to be. 14799 * 14800 * @see #getMinimumHeight() 14801 * 14802 * @attr ref android.R.styleable#View_minHeight 14803 */ 14804 public void setMinimumHeight(int minHeight) { 14805 mMinHeight = minHeight; 14806 requestLayout(); 14807 } 14808 14809 /** 14810 * Returns the minimum width of the view. 14811 * 14812 * @return the minimum width the view will try to be. 14813 * 14814 * @see #setMinimumWidth(int) 14815 * 14816 * @attr ref android.R.styleable#View_minWidth 14817 */ 14818 public int getMinimumWidth() { 14819 return mMinWidth; 14820 } 14821 14822 /** 14823 * Sets the minimum width of the view. It is not guaranteed the view will 14824 * be able to achieve this minimum width (for example, if its parent layout 14825 * constrains it with less available width). 14826 * 14827 * @param minWidth The minimum width the view will try to be. 14828 * 14829 * @see #getMinimumWidth() 14830 * 14831 * @attr ref android.R.styleable#View_minWidth 14832 */ 14833 public void setMinimumWidth(int minWidth) { 14834 mMinWidth = minWidth; 14835 requestLayout(); 14836 14837 } 14838 14839 /** 14840 * Get the animation currently associated with this view. 14841 * 14842 * @return The animation that is currently playing or 14843 * scheduled to play for this view. 14844 */ 14845 public Animation getAnimation() { 14846 return mCurrentAnimation; 14847 } 14848 14849 /** 14850 * Start the specified animation now. 14851 * 14852 * @param animation the animation to start now 14853 */ 14854 public void startAnimation(Animation animation) { 14855 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 14856 setAnimation(animation); 14857 invalidateParentCaches(); 14858 invalidate(true); 14859 } 14860 14861 /** 14862 * Cancels any animations for this view. 14863 */ 14864 public void clearAnimation() { 14865 if (mCurrentAnimation != null) { 14866 mCurrentAnimation.detach(); 14867 } 14868 mCurrentAnimation = null; 14869 invalidateParentIfNeeded(); 14870 } 14871 14872 /** 14873 * Sets the next animation to play for this view. 14874 * If you want the animation to play immediately, use 14875 * startAnimation. This method provides allows fine-grained 14876 * control over the start time and invalidation, but you 14877 * must make sure that 1) the animation has a start time set, and 14878 * 2) the view will be invalidated when the animation is supposed to 14879 * start. 14880 * 14881 * @param animation The next animation, or null. 14882 */ 14883 public void setAnimation(Animation animation) { 14884 mCurrentAnimation = animation; 14885 14886 if (animation != null) { 14887 // If the screen is off assume the animation start time is now instead of 14888 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 14889 // would cause the animation to start when the screen turns back on 14890 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 14891 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 14892 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 14893 } 14894 animation.reset(); 14895 } 14896 } 14897 14898 /** 14899 * Invoked by a parent ViewGroup to notify the start of the animation 14900 * currently associated with this view. If you override this method, 14901 * always call super.onAnimationStart(); 14902 * 14903 * @see #setAnimation(android.view.animation.Animation) 14904 * @see #getAnimation() 14905 */ 14906 protected void onAnimationStart() { 14907 mPrivateFlags |= ANIMATION_STARTED; 14908 } 14909 14910 /** 14911 * Invoked by a parent ViewGroup to notify the end of the animation 14912 * currently associated with this view. If you override this method, 14913 * always call super.onAnimationEnd(); 14914 * 14915 * @see #setAnimation(android.view.animation.Animation) 14916 * @see #getAnimation() 14917 */ 14918 protected void onAnimationEnd() { 14919 mPrivateFlags &= ~ANIMATION_STARTED; 14920 } 14921 14922 /** 14923 * Invoked if there is a Transform that involves alpha. Subclass that can 14924 * draw themselves with the specified alpha should return true, and then 14925 * respect that alpha when their onDraw() is called. If this returns false 14926 * then the view may be redirected to draw into an offscreen buffer to 14927 * fulfill the request, which will look fine, but may be slower than if the 14928 * subclass handles it internally. The default implementation returns false. 14929 * 14930 * @param alpha The alpha (0..255) to apply to the view's drawing 14931 * @return true if the view can draw with the specified alpha. 14932 */ 14933 protected boolean onSetAlpha(int alpha) { 14934 return false; 14935 } 14936 14937 /** 14938 * This is used by the RootView to perform an optimization when 14939 * the view hierarchy contains one or several SurfaceView. 14940 * SurfaceView is always considered transparent, but its children are not, 14941 * therefore all View objects remove themselves from the global transparent 14942 * region (passed as a parameter to this function). 14943 * 14944 * @param region The transparent region for this ViewAncestor (window). 14945 * 14946 * @return Returns true if the effective visibility of the view at this 14947 * point is opaque, regardless of the transparent region; returns false 14948 * if it is possible for underlying windows to be seen behind the view. 14949 * 14950 * {@hide} 14951 */ 14952 public boolean gatherTransparentRegion(Region region) { 14953 final AttachInfo attachInfo = mAttachInfo; 14954 if (region != null && attachInfo != null) { 14955 final int pflags = mPrivateFlags; 14956 if ((pflags & SKIP_DRAW) == 0) { 14957 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 14958 // remove it from the transparent region. 14959 final int[] location = attachInfo.mTransparentLocation; 14960 getLocationInWindow(location); 14961 region.op(location[0], location[1], location[0] + mRight - mLeft, 14962 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 14963 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 14964 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 14965 // exists, so we remove the background drawable's non-transparent 14966 // parts from this transparent region. 14967 applyDrawableToTransparentRegion(mBackground, region); 14968 } 14969 } 14970 return true; 14971 } 14972 14973 /** 14974 * Play a sound effect for this view. 14975 * 14976 * <p>The framework will play sound effects for some built in actions, such as 14977 * clicking, but you may wish to play these effects in your widget, 14978 * for instance, for internal navigation. 14979 * 14980 * <p>The sound effect will only be played if sound effects are enabled by the user, and 14981 * {@link #isSoundEffectsEnabled()} is true. 14982 * 14983 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 14984 */ 14985 public void playSoundEffect(int soundConstant) { 14986 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 14987 return; 14988 } 14989 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 14990 } 14991 14992 /** 14993 * BZZZTT!!1! 14994 * 14995 * <p>Provide haptic feedback to the user for this view. 14996 * 14997 * <p>The framework will provide haptic feedback for some built in actions, 14998 * such as long presses, but you may wish to provide feedback for your 14999 * own widget. 15000 * 15001 * <p>The feedback will only be performed if 15002 * {@link #isHapticFeedbackEnabled()} is true. 15003 * 15004 * @param feedbackConstant One of the constants defined in 15005 * {@link HapticFeedbackConstants} 15006 */ 15007 public boolean performHapticFeedback(int feedbackConstant) { 15008 return performHapticFeedback(feedbackConstant, 0); 15009 } 15010 15011 /** 15012 * BZZZTT!!1! 15013 * 15014 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15015 * 15016 * @param feedbackConstant One of the constants defined in 15017 * {@link HapticFeedbackConstants} 15018 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15019 */ 15020 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15021 if (mAttachInfo == null) { 15022 return false; 15023 } 15024 //noinspection SimplifiableIfStatement 15025 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15026 && !isHapticFeedbackEnabled()) { 15027 return false; 15028 } 15029 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15030 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15031 } 15032 15033 /** 15034 * Request that the visibility of the status bar or other screen/window 15035 * decorations be changed. 15036 * 15037 * <p>This method is used to put the over device UI into temporary modes 15038 * where the user's attention is focused more on the application content, 15039 * by dimming or hiding surrounding system affordances. This is typically 15040 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15041 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15042 * to be placed behind the action bar (and with these flags other system 15043 * affordances) so that smooth transitions between hiding and showing them 15044 * can be done. 15045 * 15046 * <p>Two representative examples of the use of system UI visibility is 15047 * implementing a content browsing application (like a magazine reader) 15048 * and a video playing application. 15049 * 15050 * <p>The first code shows a typical implementation of a View in a content 15051 * browsing application. In this implementation, the application goes 15052 * into a content-oriented mode by hiding the status bar and action bar, 15053 * and putting the navigation elements into lights out mode. The user can 15054 * then interact with content while in this mode. Such an application should 15055 * provide an easy way for the user to toggle out of the mode (such as to 15056 * check information in the status bar or access notifications). In the 15057 * implementation here, this is done simply by tapping on the content. 15058 * 15059 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15060 * content} 15061 * 15062 * <p>This second code sample shows a typical implementation of a View 15063 * in a video playing application. In this situation, while the video is 15064 * playing the application would like to go into a complete full-screen mode, 15065 * to use as much of the display as possible for the video. When in this state 15066 * the user can not interact with the application; the system intercepts 15067 * touching on the screen to pop the UI out of full screen mode. 15068 * 15069 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15070 * content} 15071 * 15072 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15073 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15074 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15075 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15076 */ 15077 public void setSystemUiVisibility(int visibility) { 15078 if (visibility != mSystemUiVisibility) { 15079 mSystemUiVisibility = visibility; 15080 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15081 mParent.recomputeViewAttributes(this); 15082 } 15083 } 15084 } 15085 15086 /** 15087 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15088 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15089 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15090 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15091 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15092 */ 15093 public int getSystemUiVisibility() { 15094 return mSystemUiVisibility; 15095 } 15096 15097 /** 15098 * Returns the current system UI visibility that is currently set for 15099 * the entire window. This is the combination of the 15100 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15101 * views in the window. 15102 */ 15103 public int getWindowSystemUiVisibility() { 15104 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15105 } 15106 15107 /** 15108 * Override to find out when the window's requested system UI visibility 15109 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15110 * This is different from the callbacks recieved through 15111 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15112 * in that this is only telling you about the local request of the window, 15113 * not the actual values applied by the system. 15114 */ 15115 public void onWindowSystemUiVisibilityChanged(int visible) { 15116 } 15117 15118 /** 15119 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15120 * the view hierarchy. 15121 */ 15122 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15123 onWindowSystemUiVisibilityChanged(visible); 15124 } 15125 15126 /** 15127 * Set a listener to receive callbacks when the visibility of the system bar changes. 15128 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15129 */ 15130 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15131 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15132 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15133 mParent.recomputeViewAttributes(this); 15134 } 15135 } 15136 15137 /** 15138 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15139 * the view hierarchy. 15140 */ 15141 public void dispatchSystemUiVisibilityChanged(int visibility) { 15142 ListenerInfo li = mListenerInfo; 15143 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15144 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15145 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15146 } 15147 } 15148 15149 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 15150 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15151 if (val != mSystemUiVisibility) { 15152 setSystemUiVisibility(val); 15153 } 15154 } 15155 15156 /** 15157 * Creates an image that the system displays during the drag and drop 15158 * operation. This is called a "drag shadow". The default implementation 15159 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15160 * appearance as the given View. The default also positions the center of the drag shadow 15161 * directly under the touch point. If no View is provided (the constructor with no parameters 15162 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15163 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15164 * default is an invisible drag shadow. 15165 * <p> 15166 * You are not required to use the View you provide to the constructor as the basis of the 15167 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15168 * anything you want as the drag shadow. 15169 * </p> 15170 * <p> 15171 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15172 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15173 * size and position of the drag shadow. It uses this data to construct a 15174 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15175 * so that your application can draw the shadow image in the Canvas. 15176 * </p> 15177 * 15178 * <div class="special reference"> 15179 * <h3>Developer Guides</h3> 15180 * <p>For a guide to implementing drag and drop features, read the 15181 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15182 * </div> 15183 */ 15184 public static class DragShadowBuilder { 15185 private final WeakReference<View> mView; 15186 15187 /** 15188 * Constructs a shadow image builder based on a View. By default, the resulting drag 15189 * shadow will have the same appearance and dimensions as the View, with the touch point 15190 * over the center of the View. 15191 * @param view A View. Any View in scope can be used. 15192 */ 15193 public DragShadowBuilder(View view) { 15194 mView = new WeakReference<View>(view); 15195 } 15196 15197 /** 15198 * Construct a shadow builder object with no associated View. This 15199 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15200 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15201 * to supply the drag shadow's dimensions and appearance without 15202 * reference to any View object. If they are not overridden, then the result is an 15203 * invisible drag shadow. 15204 */ 15205 public DragShadowBuilder() { 15206 mView = new WeakReference<View>(null); 15207 } 15208 15209 /** 15210 * Returns the View object that had been passed to the 15211 * {@link #View.DragShadowBuilder(View)} 15212 * constructor. If that View parameter was {@code null} or if the 15213 * {@link #View.DragShadowBuilder()} 15214 * constructor was used to instantiate the builder object, this method will return 15215 * null. 15216 * 15217 * @return The View object associate with this builder object. 15218 */ 15219 @SuppressWarnings({"JavadocReference"}) 15220 final public View getView() { 15221 return mView.get(); 15222 } 15223 15224 /** 15225 * Provides the metrics for the shadow image. These include the dimensions of 15226 * the shadow image, and the point within that shadow that should 15227 * be centered under the touch location while dragging. 15228 * <p> 15229 * The default implementation sets the dimensions of the shadow to be the 15230 * same as the dimensions of the View itself and centers the shadow under 15231 * the touch point. 15232 * </p> 15233 * 15234 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15235 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15236 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15237 * image. 15238 * 15239 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15240 * shadow image that should be underneath the touch point during the drag and drop 15241 * operation. Your application must set {@link android.graphics.Point#x} to the 15242 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15243 */ 15244 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15245 final View view = mView.get(); 15246 if (view != null) { 15247 shadowSize.set(view.getWidth(), view.getHeight()); 15248 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15249 } else { 15250 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15251 } 15252 } 15253 15254 /** 15255 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15256 * based on the dimensions it received from the 15257 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15258 * 15259 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15260 */ 15261 public void onDrawShadow(Canvas canvas) { 15262 final View view = mView.get(); 15263 if (view != null) { 15264 view.draw(canvas); 15265 } else { 15266 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15267 } 15268 } 15269 } 15270 15271 /** 15272 * Starts a drag and drop operation. When your application calls this method, it passes a 15273 * {@link android.view.View.DragShadowBuilder} object to the system. The 15274 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15275 * to get metrics for the drag shadow, and then calls the object's 15276 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15277 * <p> 15278 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15279 * drag events to all the View objects in your application that are currently visible. It does 15280 * this either by calling the View object's drag listener (an implementation of 15281 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15282 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15283 * Both are passed a {@link android.view.DragEvent} object that has a 15284 * {@link android.view.DragEvent#getAction()} value of 15285 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15286 * </p> 15287 * <p> 15288 * Your application can invoke startDrag() on any attached View object. The View object does not 15289 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15290 * be related to the View the user selected for dragging. 15291 * </p> 15292 * @param data A {@link android.content.ClipData} object pointing to the data to be 15293 * transferred by the drag and drop operation. 15294 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15295 * drag shadow. 15296 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15297 * drop operation. This Object is put into every DragEvent object sent by the system during the 15298 * current drag. 15299 * <p> 15300 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15301 * to the target Views. For example, it can contain flags that differentiate between a 15302 * a copy operation and a move operation. 15303 * </p> 15304 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15305 * so the parameter should be set to 0. 15306 * @return {@code true} if the method completes successfully, or 15307 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15308 * do a drag, and so no drag operation is in progress. 15309 */ 15310 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15311 Object myLocalState, int flags) { 15312 if (ViewDebug.DEBUG_DRAG) { 15313 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15314 } 15315 boolean okay = false; 15316 15317 Point shadowSize = new Point(); 15318 Point shadowTouchPoint = new Point(); 15319 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15320 15321 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15322 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15323 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15324 } 15325 15326 if (ViewDebug.DEBUG_DRAG) { 15327 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15328 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15329 } 15330 Surface surface = new Surface(); 15331 try { 15332 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15333 flags, shadowSize.x, shadowSize.y, surface); 15334 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15335 + " surface=" + surface); 15336 if (token != null) { 15337 Canvas canvas = surface.lockCanvas(null); 15338 try { 15339 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15340 shadowBuilder.onDrawShadow(canvas); 15341 } finally { 15342 surface.unlockCanvasAndPost(canvas); 15343 } 15344 15345 final ViewRootImpl root = getViewRootImpl(); 15346 15347 // Cache the local state object for delivery with DragEvents 15348 root.setLocalDragState(myLocalState); 15349 15350 // repurpose 'shadowSize' for the last touch point 15351 root.getLastTouchPoint(shadowSize); 15352 15353 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15354 shadowSize.x, shadowSize.y, 15355 shadowTouchPoint.x, shadowTouchPoint.y, data); 15356 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15357 15358 // Off and running! Release our local surface instance; the drag 15359 // shadow surface is now managed by the system process. 15360 surface.release(); 15361 } 15362 } catch (Exception e) { 15363 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15364 surface.destroy(); 15365 } 15366 15367 return okay; 15368 } 15369 15370 /** 15371 * Handles drag events sent by the system following a call to 15372 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15373 *<p> 15374 * When the system calls this method, it passes a 15375 * {@link android.view.DragEvent} object. A call to 15376 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15377 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15378 * operation. 15379 * @param event The {@link android.view.DragEvent} sent by the system. 15380 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15381 * in DragEvent, indicating the type of drag event represented by this object. 15382 * @return {@code true} if the method was successful, otherwise {@code false}. 15383 * <p> 15384 * The method should return {@code true} in response to an action type of 15385 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15386 * operation. 15387 * </p> 15388 * <p> 15389 * The method should also return {@code true} in response to an action type of 15390 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15391 * {@code false} if it didn't. 15392 * </p> 15393 */ 15394 public boolean onDragEvent(DragEvent event) { 15395 return false; 15396 } 15397 15398 /** 15399 * Detects if this View is enabled and has a drag event listener. 15400 * If both are true, then it calls the drag event listener with the 15401 * {@link android.view.DragEvent} it received. If the drag event listener returns 15402 * {@code true}, then dispatchDragEvent() returns {@code true}. 15403 * <p> 15404 * For all other cases, the method calls the 15405 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15406 * method and returns its result. 15407 * </p> 15408 * <p> 15409 * This ensures that a drag event is always consumed, even if the View does not have a drag 15410 * event listener. However, if the View has a listener and the listener returns true, then 15411 * onDragEvent() is not called. 15412 * </p> 15413 */ 15414 public boolean dispatchDragEvent(DragEvent event) { 15415 //noinspection SimplifiableIfStatement 15416 ListenerInfo li = mListenerInfo; 15417 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15418 && li.mOnDragListener.onDrag(this, event)) { 15419 return true; 15420 } 15421 return onDragEvent(event); 15422 } 15423 15424 boolean canAcceptDrag() { 15425 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15426 } 15427 15428 /** 15429 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15430 * it is ever exposed at all. 15431 * @hide 15432 */ 15433 public void onCloseSystemDialogs(String reason) { 15434 } 15435 15436 /** 15437 * Given a Drawable whose bounds have been set to draw into this view, 15438 * update a Region being computed for 15439 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15440 * that any non-transparent parts of the Drawable are removed from the 15441 * given transparent region. 15442 * 15443 * @param dr The Drawable whose transparency is to be applied to the region. 15444 * @param region A Region holding the current transparency information, 15445 * where any parts of the region that are set are considered to be 15446 * transparent. On return, this region will be modified to have the 15447 * transparency information reduced by the corresponding parts of the 15448 * Drawable that are not transparent. 15449 * {@hide} 15450 */ 15451 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15452 if (DBG) { 15453 Log.i("View", "Getting transparent region for: " + this); 15454 } 15455 final Region r = dr.getTransparentRegion(); 15456 final Rect db = dr.getBounds(); 15457 final AttachInfo attachInfo = mAttachInfo; 15458 if (r != null && attachInfo != null) { 15459 final int w = getRight()-getLeft(); 15460 final int h = getBottom()-getTop(); 15461 if (db.left > 0) { 15462 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15463 r.op(0, 0, db.left, h, Region.Op.UNION); 15464 } 15465 if (db.right < w) { 15466 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15467 r.op(db.right, 0, w, h, Region.Op.UNION); 15468 } 15469 if (db.top > 0) { 15470 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15471 r.op(0, 0, w, db.top, Region.Op.UNION); 15472 } 15473 if (db.bottom < h) { 15474 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15475 r.op(0, db.bottom, w, h, Region.Op.UNION); 15476 } 15477 final int[] location = attachInfo.mTransparentLocation; 15478 getLocationInWindow(location); 15479 r.translate(location[0], location[1]); 15480 region.op(r, Region.Op.INTERSECT); 15481 } else { 15482 region.op(db, Region.Op.DIFFERENCE); 15483 } 15484 } 15485 15486 private void checkForLongClick(int delayOffset) { 15487 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15488 mHasPerformedLongPress = false; 15489 15490 if (mPendingCheckForLongPress == null) { 15491 mPendingCheckForLongPress = new CheckForLongPress(); 15492 } 15493 mPendingCheckForLongPress.rememberWindowAttachCount(); 15494 postDelayed(mPendingCheckForLongPress, 15495 ViewConfiguration.getLongPressTimeout() - delayOffset); 15496 } 15497 } 15498 15499 /** 15500 * Inflate a view from an XML resource. This convenience method wraps the {@link 15501 * LayoutInflater} class, which provides a full range of options for view inflation. 15502 * 15503 * @param context The Context object for your activity or application. 15504 * @param resource The resource ID to inflate 15505 * @param root A view group that will be the parent. Used to properly inflate the 15506 * layout_* parameters. 15507 * @see LayoutInflater 15508 */ 15509 public static View inflate(Context context, int resource, ViewGroup root) { 15510 LayoutInflater factory = LayoutInflater.from(context); 15511 return factory.inflate(resource, root); 15512 } 15513 15514 /** 15515 * Scroll the view with standard behavior for scrolling beyond the normal 15516 * content boundaries. Views that call this method should override 15517 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15518 * results of an over-scroll operation. 15519 * 15520 * Views can use this method to handle any touch or fling-based scrolling. 15521 * 15522 * @param deltaX Change in X in pixels 15523 * @param deltaY Change in Y in pixels 15524 * @param scrollX Current X scroll value in pixels before applying deltaX 15525 * @param scrollY Current Y scroll value in pixels before applying deltaY 15526 * @param scrollRangeX Maximum content scroll range along the X axis 15527 * @param scrollRangeY Maximum content scroll range along the Y axis 15528 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15529 * along the X axis. 15530 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15531 * along the Y axis. 15532 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15533 * @return true if scrolling was clamped to an over-scroll boundary along either 15534 * axis, false otherwise. 15535 */ 15536 @SuppressWarnings({"UnusedParameters"}) 15537 protected boolean overScrollBy(int deltaX, int deltaY, 15538 int scrollX, int scrollY, 15539 int scrollRangeX, int scrollRangeY, 15540 int maxOverScrollX, int maxOverScrollY, 15541 boolean isTouchEvent) { 15542 final int overScrollMode = mOverScrollMode; 15543 final boolean canScrollHorizontal = 15544 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15545 final boolean canScrollVertical = 15546 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15547 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15548 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15549 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15550 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15551 15552 int newScrollX = scrollX + deltaX; 15553 if (!overScrollHorizontal) { 15554 maxOverScrollX = 0; 15555 } 15556 15557 int newScrollY = scrollY + deltaY; 15558 if (!overScrollVertical) { 15559 maxOverScrollY = 0; 15560 } 15561 15562 // Clamp values if at the limits and record 15563 final int left = -maxOverScrollX; 15564 final int right = maxOverScrollX + scrollRangeX; 15565 final int top = -maxOverScrollY; 15566 final int bottom = maxOverScrollY + scrollRangeY; 15567 15568 boolean clampedX = false; 15569 if (newScrollX > right) { 15570 newScrollX = right; 15571 clampedX = true; 15572 } else if (newScrollX < left) { 15573 newScrollX = left; 15574 clampedX = true; 15575 } 15576 15577 boolean clampedY = false; 15578 if (newScrollY > bottom) { 15579 newScrollY = bottom; 15580 clampedY = true; 15581 } else if (newScrollY < top) { 15582 newScrollY = top; 15583 clampedY = true; 15584 } 15585 15586 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 15587 15588 return clampedX || clampedY; 15589 } 15590 15591 /** 15592 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 15593 * respond to the results of an over-scroll operation. 15594 * 15595 * @param scrollX New X scroll value in pixels 15596 * @param scrollY New Y scroll value in pixels 15597 * @param clampedX True if scrollX was clamped to an over-scroll boundary 15598 * @param clampedY True if scrollY was clamped to an over-scroll boundary 15599 */ 15600 protected void onOverScrolled(int scrollX, int scrollY, 15601 boolean clampedX, boolean clampedY) { 15602 // Intentionally empty. 15603 } 15604 15605 /** 15606 * Returns the over-scroll mode for this view. The result will be 15607 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15608 * (allow over-scrolling only if the view content is larger than the container), 15609 * or {@link #OVER_SCROLL_NEVER}. 15610 * 15611 * @return This view's over-scroll mode. 15612 */ 15613 public int getOverScrollMode() { 15614 return mOverScrollMode; 15615 } 15616 15617 /** 15618 * Set the over-scroll mode for this view. Valid over-scroll modes are 15619 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15620 * (allow over-scrolling only if the view content is larger than the container), 15621 * or {@link #OVER_SCROLL_NEVER}. 15622 * 15623 * Setting the over-scroll mode of a view will have an effect only if the 15624 * view is capable of scrolling. 15625 * 15626 * @param overScrollMode The new over-scroll mode for this view. 15627 */ 15628 public void setOverScrollMode(int overScrollMode) { 15629 if (overScrollMode != OVER_SCROLL_ALWAYS && 15630 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 15631 overScrollMode != OVER_SCROLL_NEVER) { 15632 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 15633 } 15634 mOverScrollMode = overScrollMode; 15635 } 15636 15637 /** 15638 * Gets a scale factor that determines the distance the view should scroll 15639 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 15640 * @return The vertical scroll scale factor. 15641 * @hide 15642 */ 15643 protected float getVerticalScrollFactor() { 15644 if (mVerticalScrollFactor == 0) { 15645 TypedValue outValue = new TypedValue(); 15646 if (!mContext.getTheme().resolveAttribute( 15647 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 15648 throw new IllegalStateException( 15649 "Expected theme to define listPreferredItemHeight."); 15650 } 15651 mVerticalScrollFactor = outValue.getDimension( 15652 mContext.getResources().getDisplayMetrics()); 15653 } 15654 return mVerticalScrollFactor; 15655 } 15656 15657 /** 15658 * Gets a scale factor that determines the distance the view should scroll 15659 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 15660 * @return The horizontal scroll scale factor. 15661 * @hide 15662 */ 15663 protected float getHorizontalScrollFactor() { 15664 // TODO: Should use something else. 15665 return getVerticalScrollFactor(); 15666 } 15667 15668 /** 15669 * Return the value specifying the text direction or policy that was set with 15670 * {@link #setTextDirection(int)}. 15671 * 15672 * @return the defined text direction. It can be one of: 15673 * 15674 * {@link #TEXT_DIRECTION_INHERIT}, 15675 * {@link #TEXT_DIRECTION_FIRST_STRONG} 15676 * {@link #TEXT_DIRECTION_ANY_RTL}, 15677 * {@link #TEXT_DIRECTION_LTR}, 15678 * {@link #TEXT_DIRECTION_RTL}, 15679 * {@link #TEXT_DIRECTION_LOCALE} 15680 */ 15681 @ViewDebug.ExportedProperty(category = "text", mapping = { 15682 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 15683 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 15684 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 15685 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 15686 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 15687 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 15688 }) 15689 public int getTextDirection() { 15690 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 15691 } 15692 15693 /** 15694 * Set the text direction. 15695 * 15696 * @param textDirection the direction to set. Should be one of: 15697 * 15698 * {@link #TEXT_DIRECTION_INHERIT}, 15699 * {@link #TEXT_DIRECTION_FIRST_STRONG} 15700 * {@link #TEXT_DIRECTION_ANY_RTL}, 15701 * {@link #TEXT_DIRECTION_LTR}, 15702 * {@link #TEXT_DIRECTION_RTL}, 15703 * {@link #TEXT_DIRECTION_LOCALE} 15704 */ 15705 public void setTextDirection(int textDirection) { 15706 if (getTextDirection() != textDirection) { 15707 // Reset the current text direction and the resolved one 15708 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 15709 resetResolvedTextDirection(); 15710 // Set the new text direction 15711 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 15712 // Refresh 15713 requestLayout(); 15714 invalidate(true); 15715 } 15716 } 15717 15718 /** 15719 * Return the resolved text direction. 15720 * 15721 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 15722 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 15723 * up the parent chain of the view. if there is no parent, then it will return the default 15724 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 15725 * 15726 * @return the resolved text direction. Returns one of: 15727 * 15728 * {@link #TEXT_DIRECTION_FIRST_STRONG} 15729 * {@link #TEXT_DIRECTION_ANY_RTL}, 15730 * {@link #TEXT_DIRECTION_LTR}, 15731 * {@link #TEXT_DIRECTION_RTL}, 15732 * {@link #TEXT_DIRECTION_LOCALE} 15733 */ 15734 public int getResolvedTextDirection() { 15735 // The text direction will be resolved only if needed 15736 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 15737 resolveTextDirection(); 15738 } 15739 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 15740 } 15741 15742 /** 15743 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 15744 * resolution is done. 15745 */ 15746 public void resolveTextDirection() { 15747 // Reset any previous text direction resolution 15748 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 15749 15750 if (hasRtlSupport()) { 15751 // Set resolved text direction flag depending on text direction flag 15752 final int textDirection = getTextDirection(); 15753 switch(textDirection) { 15754 case TEXT_DIRECTION_INHERIT: 15755 if (canResolveTextDirection()) { 15756 ViewGroup viewGroup = ((ViewGroup) mParent); 15757 15758 // Set current resolved direction to the same value as the parent's one 15759 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 15760 switch (parentResolvedDirection) { 15761 case TEXT_DIRECTION_FIRST_STRONG: 15762 case TEXT_DIRECTION_ANY_RTL: 15763 case TEXT_DIRECTION_LTR: 15764 case TEXT_DIRECTION_RTL: 15765 case TEXT_DIRECTION_LOCALE: 15766 mPrivateFlags2 |= 15767 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 15768 break; 15769 default: 15770 // Default resolved direction is "first strong" heuristic 15771 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 15772 } 15773 } else { 15774 // We cannot do the resolution if there is no parent, so use the default one 15775 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 15776 } 15777 break; 15778 case TEXT_DIRECTION_FIRST_STRONG: 15779 case TEXT_DIRECTION_ANY_RTL: 15780 case TEXT_DIRECTION_LTR: 15781 case TEXT_DIRECTION_RTL: 15782 case TEXT_DIRECTION_LOCALE: 15783 // Resolved direction is the same as text direction 15784 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 15785 break; 15786 default: 15787 // Default resolved direction is "first strong" heuristic 15788 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 15789 } 15790 } else { 15791 // Default resolved direction is "first strong" heuristic 15792 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 15793 } 15794 15795 // Set to resolved 15796 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 15797 onResolvedTextDirectionChanged(); 15798 } 15799 15800 /** 15801 * Called when text direction has been resolved. Subclasses that care about text direction 15802 * resolution should override this method. 15803 * 15804 * The default implementation does nothing. 15805 */ 15806 public void onResolvedTextDirectionChanged() { 15807 } 15808 15809 /** 15810 * Check if text direction resolution can be done. 15811 * 15812 * @return true if text direction resolution can be done otherwise return false. 15813 */ 15814 public boolean canResolveTextDirection() { 15815 switch (getTextDirection()) { 15816 case TEXT_DIRECTION_INHERIT: 15817 return (mParent != null) && (mParent instanceof ViewGroup); 15818 default: 15819 return true; 15820 } 15821 } 15822 15823 /** 15824 * Reset resolved text direction. Text direction can be resolved with a call to 15825 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 15826 * reset is done. 15827 */ 15828 public void resetResolvedTextDirection() { 15829 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 15830 onResolvedTextDirectionReset(); 15831 } 15832 15833 /** 15834 * Called when text direction is reset. Subclasses that care about text direction reset should 15835 * override this method and do a reset of the text direction of their children. The default 15836 * implementation does nothing. 15837 */ 15838 public void onResolvedTextDirectionReset() { 15839 } 15840 15841 /** 15842 * Return the value specifying the text alignment or policy that was set with 15843 * {@link #setTextAlignment(int)}. 15844 * 15845 * @return the defined text alignment. It can be one of: 15846 * 15847 * {@link #TEXT_ALIGNMENT_INHERIT}, 15848 * {@link #TEXT_ALIGNMENT_GRAVITY}, 15849 * {@link #TEXT_ALIGNMENT_CENTER}, 15850 * {@link #TEXT_ALIGNMENT_TEXT_START}, 15851 * {@link #TEXT_ALIGNMENT_TEXT_END}, 15852 * {@link #TEXT_ALIGNMENT_VIEW_START}, 15853 * {@link #TEXT_ALIGNMENT_VIEW_END} 15854 */ 15855 @ViewDebug.ExportedProperty(category = "text", mapping = { 15856 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 15857 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 15858 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 15859 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 15860 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 15861 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 15862 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 15863 }) 15864 public int getTextAlignment() { 15865 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 15866 } 15867 15868 /** 15869 * Set the text alignment. 15870 * 15871 * @param textAlignment The text alignment to set. Should be one of 15872 * 15873 * {@link #TEXT_ALIGNMENT_INHERIT}, 15874 * {@link #TEXT_ALIGNMENT_GRAVITY}, 15875 * {@link #TEXT_ALIGNMENT_CENTER}, 15876 * {@link #TEXT_ALIGNMENT_TEXT_START}, 15877 * {@link #TEXT_ALIGNMENT_TEXT_END}, 15878 * {@link #TEXT_ALIGNMENT_VIEW_START}, 15879 * {@link #TEXT_ALIGNMENT_VIEW_END} 15880 * 15881 * @attr ref android.R.styleable#View_textAlignment 15882 */ 15883 public void setTextAlignment(int textAlignment) { 15884 if (textAlignment != getTextAlignment()) { 15885 // Reset the current and resolved text alignment 15886 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 15887 resetResolvedTextAlignment(); 15888 // Set the new text alignment 15889 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 15890 // Refresh 15891 requestLayout(); 15892 invalidate(true); 15893 } 15894 } 15895 15896 /** 15897 * Return the resolved text alignment. 15898 * 15899 * The resolved text alignment. This needs resolution if the value is 15900 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 15901 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 15902 * 15903 * @return the resolved text alignment. Returns one of: 15904 * 15905 * {@link #TEXT_ALIGNMENT_GRAVITY}, 15906 * {@link #TEXT_ALIGNMENT_CENTER}, 15907 * {@link #TEXT_ALIGNMENT_TEXT_START}, 15908 * {@link #TEXT_ALIGNMENT_TEXT_END}, 15909 * {@link #TEXT_ALIGNMENT_VIEW_START}, 15910 * {@link #TEXT_ALIGNMENT_VIEW_END} 15911 */ 15912 @ViewDebug.ExportedProperty(category = "text", mapping = { 15913 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 15914 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 15915 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 15916 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 15917 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 15918 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 15919 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 15920 }) 15921 public int getResolvedTextAlignment() { 15922 // If text alignment is not resolved, then resolve it 15923 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 15924 resolveTextAlignment(); 15925 } 15926 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 15927 } 15928 15929 /** 15930 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 15931 * resolution is done. 15932 */ 15933 public void resolveTextAlignment() { 15934 // Reset any previous text alignment resolution 15935 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 15936 15937 if (hasRtlSupport()) { 15938 // Set resolved text alignment flag depending on text alignment flag 15939 final int textAlignment = getTextAlignment(); 15940 switch (textAlignment) { 15941 case TEXT_ALIGNMENT_INHERIT: 15942 // Check if we can resolve the text alignment 15943 if (canResolveLayoutDirection() && mParent instanceof View) { 15944 View view = (View) mParent; 15945 15946 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 15947 switch (parentResolvedTextAlignment) { 15948 case TEXT_ALIGNMENT_GRAVITY: 15949 case TEXT_ALIGNMENT_TEXT_START: 15950 case TEXT_ALIGNMENT_TEXT_END: 15951 case TEXT_ALIGNMENT_CENTER: 15952 case TEXT_ALIGNMENT_VIEW_START: 15953 case TEXT_ALIGNMENT_VIEW_END: 15954 // Resolved text alignment is the same as the parent resolved 15955 // text alignment 15956 mPrivateFlags2 |= 15957 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 15958 break; 15959 default: 15960 // Use default resolved text alignment 15961 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 15962 } 15963 } 15964 else { 15965 // We cannot do the resolution if there is no parent so use the default 15966 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 15967 } 15968 break; 15969 case TEXT_ALIGNMENT_GRAVITY: 15970 case TEXT_ALIGNMENT_TEXT_START: 15971 case TEXT_ALIGNMENT_TEXT_END: 15972 case TEXT_ALIGNMENT_CENTER: 15973 case TEXT_ALIGNMENT_VIEW_START: 15974 case TEXT_ALIGNMENT_VIEW_END: 15975 // Resolved text alignment is the same as text alignment 15976 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 15977 break; 15978 default: 15979 // Use default resolved text alignment 15980 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 15981 } 15982 } else { 15983 // Use default resolved text alignment 15984 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 15985 } 15986 15987 // Set the resolved 15988 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 15989 onResolvedTextAlignmentChanged(); 15990 } 15991 15992 /** 15993 * Check if text alignment resolution can be done. 15994 * 15995 * @return true if text alignment resolution can be done otherwise return false. 15996 */ 15997 public boolean canResolveTextAlignment() { 15998 switch (getTextAlignment()) { 15999 case TEXT_DIRECTION_INHERIT: 16000 return (mParent != null); 16001 default: 16002 return true; 16003 } 16004 } 16005 16006 /** 16007 * Called when text alignment has been resolved. Subclasses that care about text alignment 16008 * resolution should override this method. 16009 * 16010 * The default implementation does nothing. 16011 */ 16012 public void onResolvedTextAlignmentChanged() { 16013 } 16014 16015 /** 16016 * Reset resolved text alignment. Text alignment can be resolved with a call to 16017 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16018 * reset is done. 16019 */ 16020 public void resetResolvedTextAlignment() { 16021 // Reset any previous text alignment resolution 16022 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16023 onResolvedTextAlignmentReset(); 16024 } 16025 16026 /** 16027 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16028 * override this method and do a reset of the text alignment of their children. The default 16029 * implementation does nothing. 16030 */ 16031 public void onResolvedTextAlignmentReset() { 16032 } 16033 16034 // 16035 // Properties 16036 // 16037 /** 16038 * A Property wrapper around the <code>alpha</code> functionality handled by the 16039 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16040 */ 16041 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16042 @Override 16043 public void setValue(View object, float value) { 16044 object.setAlpha(value); 16045 } 16046 16047 @Override 16048 public Float get(View object) { 16049 return object.getAlpha(); 16050 } 16051 }; 16052 16053 /** 16054 * A Property wrapper around the <code>translationX</code> functionality handled by the 16055 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16056 */ 16057 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16058 @Override 16059 public void setValue(View object, float value) { 16060 object.setTranslationX(value); 16061 } 16062 16063 @Override 16064 public Float get(View object) { 16065 return object.getTranslationX(); 16066 } 16067 }; 16068 16069 /** 16070 * A Property wrapper around the <code>translationY</code> functionality handled by the 16071 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16072 */ 16073 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16074 @Override 16075 public void setValue(View object, float value) { 16076 object.setTranslationY(value); 16077 } 16078 16079 @Override 16080 public Float get(View object) { 16081 return object.getTranslationY(); 16082 } 16083 }; 16084 16085 /** 16086 * A Property wrapper around the <code>x</code> functionality handled by the 16087 * {@link View#setX(float)} and {@link View#getX()} methods. 16088 */ 16089 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16090 @Override 16091 public void setValue(View object, float value) { 16092 object.setX(value); 16093 } 16094 16095 @Override 16096 public Float get(View object) { 16097 return object.getX(); 16098 } 16099 }; 16100 16101 /** 16102 * A Property wrapper around the <code>y</code> functionality handled by the 16103 * {@link View#setY(float)} and {@link View#getY()} methods. 16104 */ 16105 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16106 @Override 16107 public void setValue(View object, float value) { 16108 object.setY(value); 16109 } 16110 16111 @Override 16112 public Float get(View object) { 16113 return object.getY(); 16114 } 16115 }; 16116 16117 /** 16118 * A Property wrapper around the <code>rotation</code> functionality handled by the 16119 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16120 */ 16121 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16122 @Override 16123 public void setValue(View object, float value) { 16124 object.setRotation(value); 16125 } 16126 16127 @Override 16128 public Float get(View object) { 16129 return object.getRotation(); 16130 } 16131 }; 16132 16133 /** 16134 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16135 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16136 */ 16137 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16138 @Override 16139 public void setValue(View object, float value) { 16140 object.setRotationX(value); 16141 } 16142 16143 @Override 16144 public Float get(View object) { 16145 return object.getRotationX(); 16146 } 16147 }; 16148 16149 /** 16150 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16151 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16152 */ 16153 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16154 @Override 16155 public void setValue(View object, float value) { 16156 object.setRotationY(value); 16157 } 16158 16159 @Override 16160 public Float get(View object) { 16161 return object.getRotationY(); 16162 } 16163 }; 16164 16165 /** 16166 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16167 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16168 */ 16169 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16170 @Override 16171 public void setValue(View object, float value) { 16172 object.setScaleX(value); 16173 } 16174 16175 @Override 16176 public Float get(View object) { 16177 return object.getScaleX(); 16178 } 16179 }; 16180 16181 /** 16182 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16183 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16184 */ 16185 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16186 @Override 16187 public void setValue(View object, float value) { 16188 object.setScaleY(value); 16189 } 16190 16191 @Override 16192 public Float get(View object) { 16193 return object.getScaleY(); 16194 } 16195 }; 16196 16197 /** 16198 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16199 * Each MeasureSpec represents a requirement for either the width or the height. 16200 * A MeasureSpec is comprised of a size and a mode. There are three possible 16201 * modes: 16202 * <dl> 16203 * <dt>UNSPECIFIED</dt> 16204 * <dd> 16205 * The parent has not imposed any constraint on the child. It can be whatever size 16206 * it wants. 16207 * </dd> 16208 * 16209 * <dt>EXACTLY</dt> 16210 * <dd> 16211 * The parent has determined an exact size for the child. The child is going to be 16212 * given those bounds regardless of how big it wants to be. 16213 * </dd> 16214 * 16215 * <dt>AT_MOST</dt> 16216 * <dd> 16217 * The child can be as large as it wants up to the specified size. 16218 * </dd> 16219 * </dl> 16220 * 16221 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16222 * is provided to pack and unpack the <size, mode> tuple into the int. 16223 */ 16224 public static class MeasureSpec { 16225 private static final int MODE_SHIFT = 30; 16226 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16227 16228 /** 16229 * Measure specification mode: The parent has not imposed any constraint 16230 * on the child. It can be whatever size it wants. 16231 */ 16232 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16233 16234 /** 16235 * Measure specification mode: The parent has determined an exact size 16236 * for the child. The child is going to be given those bounds regardless 16237 * of how big it wants to be. 16238 */ 16239 public static final int EXACTLY = 1 << MODE_SHIFT; 16240 16241 /** 16242 * Measure specification mode: The child can be as large as it wants up 16243 * to the specified size. 16244 */ 16245 public static final int AT_MOST = 2 << MODE_SHIFT; 16246 16247 /** 16248 * Creates a measure specification based on the supplied size and mode. 16249 * 16250 * The mode must always be one of the following: 16251 * <ul> 16252 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16253 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16254 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16255 * </ul> 16256 * 16257 * @param size the size of the measure specification 16258 * @param mode the mode of the measure specification 16259 * @return the measure specification based on size and mode 16260 */ 16261 public static int makeMeasureSpec(int size, int mode) { 16262 return size + mode; 16263 } 16264 16265 /** 16266 * Extracts the mode from the supplied measure specification. 16267 * 16268 * @param measureSpec the measure specification to extract the mode from 16269 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16270 * {@link android.view.View.MeasureSpec#AT_MOST} or 16271 * {@link android.view.View.MeasureSpec#EXACTLY} 16272 */ 16273 public static int getMode(int measureSpec) { 16274 return (measureSpec & MODE_MASK); 16275 } 16276 16277 /** 16278 * Extracts the size from the supplied measure specification. 16279 * 16280 * @param measureSpec the measure specification to extract the size from 16281 * @return the size in pixels defined in the supplied measure specification 16282 */ 16283 public static int getSize(int measureSpec) { 16284 return (measureSpec & ~MODE_MASK); 16285 } 16286 16287 /** 16288 * Returns a String representation of the specified measure 16289 * specification. 16290 * 16291 * @param measureSpec the measure specification to convert to a String 16292 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16293 */ 16294 public static String toString(int measureSpec) { 16295 int mode = getMode(measureSpec); 16296 int size = getSize(measureSpec); 16297 16298 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16299 16300 if (mode == UNSPECIFIED) 16301 sb.append("UNSPECIFIED "); 16302 else if (mode == EXACTLY) 16303 sb.append("EXACTLY "); 16304 else if (mode == AT_MOST) 16305 sb.append("AT_MOST "); 16306 else 16307 sb.append(mode).append(" "); 16308 16309 sb.append(size); 16310 return sb.toString(); 16311 } 16312 } 16313 16314 class CheckForLongPress implements Runnable { 16315 16316 private int mOriginalWindowAttachCount; 16317 16318 public void run() { 16319 if (isPressed() && (mParent != null) 16320 && mOriginalWindowAttachCount == mWindowAttachCount) { 16321 if (performLongClick()) { 16322 mHasPerformedLongPress = true; 16323 } 16324 } 16325 } 16326 16327 public void rememberWindowAttachCount() { 16328 mOriginalWindowAttachCount = mWindowAttachCount; 16329 } 16330 } 16331 16332 private final class CheckForTap implements Runnable { 16333 public void run() { 16334 mPrivateFlags &= ~PREPRESSED; 16335 setPressed(true); 16336 checkForLongClick(ViewConfiguration.getTapTimeout()); 16337 } 16338 } 16339 16340 private final class PerformClick implements Runnable { 16341 public void run() { 16342 performClick(); 16343 } 16344 } 16345 16346 /** @hide */ 16347 public void hackTurnOffWindowResizeAnim(boolean off) { 16348 mAttachInfo.mTurnOffWindowResizeAnim = off; 16349 } 16350 16351 /** 16352 * This method returns a ViewPropertyAnimator object, which can be used to animate 16353 * specific properties on this View. 16354 * 16355 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16356 */ 16357 public ViewPropertyAnimator animate() { 16358 if (mAnimator == null) { 16359 mAnimator = new ViewPropertyAnimator(this); 16360 } 16361 return mAnimator; 16362 } 16363 16364 /** 16365 * Interface definition for a callback to be invoked when a key event is 16366 * dispatched to this view. The callback will be invoked before the key 16367 * event is given to the view. 16368 */ 16369 public interface OnKeyListener { 16370 /** 16371 * Called when a key is dispatched to a view. This allows listeners to 16372 * get a chance to respond before the target view. 16373 * 16374 * @param v The view the key has been dispatched to. 16375 * @param keyCode The code for the physical key that was pressed 16376 * @param event The KeyEvent object containing full information about 16377 * the event. 16378 * @return True if the listener has consumed the event, false otherwise. 16379 */ 16380 boolean onKey(View v, int keyCode, KeyEvent event); 16381 } 16382 16383 /** 16384 * Interface definition for a callback to be invoked when a touch event is 16385 * dispatched to this view. The callback will be invoked before the touch 16386 * event is given to the view. 16387 */ 16388 public interface OnTouchListener { 16389 /** 16390 * Called when a touch event is dispatched to a view. This allows listeners to 16391 * get a chance to respond before the target view. 16392 * 16393 * @param v The view the touch event has been dispatched to. 16394 * @param event The MotionEvent object containing full information about 16395 * the event. 16396 * @return True if the listener has consumed the event, false otherwise. 16397 */ 16398 boolean onTouch(View v, MotionEvent event); 16399 } 16400 16401 /** 16402 * Interface definition for a callback to be invoked when a hover event is 16403 * dispatched to this view. The callback will be invoked before the hover 16404 * event is given to the view. 16405 */ 16406 public interface OnHoverListener { 16407 /** 16408 * Called when a hover event is dispatched to a view. This allows listeners to 16409 * get a chance to respond before the target view. 16410 * 16411 * @param v The view the hover event has been dispatched to. 16412 * @param event The MotionEvent object containing full information about 16413 * the event. 16414 * @return True if the listener has consumed the event, false otherwise. 16415 */ 16416 boolean onHover(View v, MotionEvent event); 16417 } 16418 16419 /** 16420 * Interface definition for a callback to be invoked when a generic motion event is 16421 * dispatched to this view. The callback will be invoked before the generic motion 16422 * event is given to the view. 16423 */ 16424 public interface OnGenericMotionListener { 16425 /** 16426 * Called when a generic motion event is dispatched to a view. This allows listeners to 16427 * get a chance to respond before the target view. 16428 * 16429 * @param v The view the generic motion event has been dispatched to. 16430 * @param event The MotionEvent object containing full information about 16431 * the event. 16432 * @return True if the listener has consumed the event, false otherwise. 16433 */ 16434 boolean onGenericMotion(View v, MotionEvent event); 16435 } 16436 16437 /** 16438 * Interface definition for a callback to be invoked when a view has been clicked and held. 16439 */ 16440 public interface OnLongClickListener { 16441 /** 16442 * Called when a view has been clicked and held. 16443 * 16444 * @param v The view that was clicked and held. 16445 * 16446 * @return true if the callback consumed the long click, false otherwise. 16447 */ 16448 boolean onLongClick(View v); 16449 } 16450 16451 /** 16452 * Interface definition for a callback to be invoked when a drag is being dispatched 16453 * to this view. The callback will be invoked before the hosting view's own 16454 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16455 * onDrag(event) behavior, it should return 'false' from this callback. 16456 * 16457 * <div class="special reference"> 16458 * <h3>Developer Guides</h3> 16459 * <p>For a guide to implementing drag and drop features, read the 16460 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16461 * </div> 16462 */ 16463 public interface OnDragListener { 16464 /** 16465 * Called when a drag event is dispatched to a view. This allows listeners 16466 * to get a chance to override base View behavior. 16467 * 16468 * @param v The View that received the drag event. 16469 * @param event The {@link android.view.DragEvent} object for the drag event. 16470 * @return {@code true} if the drag event was handled successfully, or {@code false} 16471 * if the drag event was not handled. Note that {@code false} will trigger the View 16472 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16473 */ 16474 boolean onDrag(View v, DragEvent event); 16475 } 16476 16477 /** 16478 * Interface definition for a callback to be invoked when the focus state of 16479 * a view changed. 16480 */ 16481 public interface OnFocusChangeListener { 16482 /** 16483 * Called when the focus state of a view has changed. 16484 * 16485 * @param v The view whose state has changed. 16486 * @param hasFocus The new focus state of v. 16487 */ 16488 void onFocusChange(View v, boolean hasFocus); 16489 } 16490 16491 /** 16492 * Interface definition for a callback to be invoked when a view is clicked. 16493 */ 16494 public interface OnClickListener { 16495 /** 16496 * Called when a view has been clicked. 16497 * 16498 * @param v The view that was clicked. 16499 */ 16500 void onClick(View v); 16501 } 16502 16503 /** 16504 * Interface definition for a callback to be invoked when the context menu 16505 * for this view is being built. 16506 */ 16507 public interface OnCreateContextMenuListener { 16508 /** 16509 * Called when the context menu for this view is being built. It is not 16510 * safe to hold onto the menu after this method returns. 16511 * 16512 * @param menu The context menu that is being built 16513 * @param v The view for which the context menu is being built 16514 * @param menuInfo Extra information about the item for which the 16515 * context menu should be shown. This information will vary 16516 * depending on the class of v. 16517 */ 16518 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16519 } 16520 16521 /** 16522 * Interface definition for a callback to be invoked when the status bar changes 16523 * visibility. This reports <strong>global</strong> changes to the system UI 16524 * state, not just what the application is requesting. 16525 * 16526 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16527 */ 16528 public interface OnSystemUiVisibilityChangeListener { 16529 /** 16530 * Called when the status bar changes visibility because of a call to 16531 * {@link View#setSystemUiVisibility(int)}. 16532 * 16533 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 16534 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. This tells you the 16535 * <strong>global</strong> state of the UI visibility flags, not what your 16536 * app is currently applying. 16537 */ 16538 public void onSystemUiVisibilityChange(int visibility); 16539 } 16540 16541 /** 16542 * Interface definition for a callback to be invoked when this view is attached 16543 * or detached from its window. 16544 */ 16545 public interface OnAttachStateChangeListener { 16546 /** 16547 * Called when the view is attached to a window. 16548 * @param v The view that was attached 16549 */ 16550 public void onViewAttachedToWindow(View v); 16551 /** 16552 * Called when the view is detached from a window. 16553 * @param v The view that was detached 16554 */ 16555 public void onViewDetachedFromWindow(View v); 16556 } 16557 16558 private final class UnsetPressedState implements Runnable { 16559 public void run() { 16560 setPressed(false); 16561 } 16562 } 16563 16564 /** 16565 * Base class for derived classes that want to save and restore their own 16566 * state in {@link android.view.View#onSaveInstanceState()}. 16567 */ 16568 public static class BaseSavedState extends AbsSavedState { 16569 /** 16570 * Constructor used when reading from a parcel. Reads the state of the superclass. 16571 * 16572 * @param source 16573 */ 16574 public BaseSavedState(Parcel source) { 16575 super(source); 16576 } 16577 16578 /** 16579 * Constructor called by derived classes when creating their SavedState objects 16580 * 16581 * @param superState The state of the superclass of this view 16582 */ 16583 public BaseSavedState(Parcelable superState) { 16584 super(superState); 16585 } 16586 16587 public static final Parcelable.Creator<BaseSavedState> CREATOR = 16588 new Parcelable.Creator<BaseSavedState>() { 16589 public BaseSavedState createFromParcel(Parcel in) { 16590 return new BaseSavedState(in); 16591 } 16592 16593 public BaseSavedState[] newArray(int size) { 16594 return new BaseSavedState[size]; 16595 } 16596 }; 16597 } 16598 16599 /** 16600 * A set of information given to a view when it is attached to its parent 16601 * window. 16602 */ 16603 static class AttachInfo { 16604 interface Callbacks { 16605 void playSoundEffect(int effectId); 16606 boolean performHapticFeedback(int effectId, boolean always); 16607 } 16608 16609 /** 16610 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 16611 * to a Handler. This class contains the target (View) to invalidate and 16612 * the coordinates of the dirty rectangle. 16613 * 16614 * For performance purposes, this class also implements a pool of up to 16615 * POOL_LIMIT objects that get reused. This reduces memory allocations 16616 * whenever possible. 16617 */ 16618 static class InvalidateInfo implements Poolable<InvalidateInfo> { 16619 private static final int POOL_LIMIT = 10; 16620 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 16621 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 16622 public InvalidateInfo newInstance() { 16623 return new InvalidateInfo(); 16624 } 16625 16626 public void onAcquired(InvalidateInfo element) { 16627 } 16628 16629 public void onReleased(InvalidateInfo element) { 16630 element.target = null; 16631 } 16632 }, POOL_LIMIT) 16633 ); 16634 16635 private InvalidateInfo mNext; 16636 private boolean mIsPooled; 16637 16638 View target; 16639 16640 int left; 16641 int top; 16642 int right; 16643 int bottom; 16644 16645 public void setNextPoolable(InvalidateInfo element) { 16646 mNext = element; 16647 } 16648 16649 public InvalidateInfo getNextPoolable() { 16650 return mNext; 16651 } 16652 16653 static InvalidateInfo acquire() { 16654 return sPool.acquire(); 16655 } 16656 16657 void release() { 16658 sPool.release(this); 16659 } 16660 16661 public boolean isPooled() { 16662 return mIsPooled; 16663 } 16664 16665 public void setPooled(boolean isPooled) { 16666 mIsPooled = isPooled; 16667 } 16668 } 16669 16670 final IWindowSession mSession; 16671 16672 final IWindow mWindow; 16673 16674 final IBinder mWindowToken; 16675 16676 final Callbacks mRootCallbacks; 16677 16678 HardwareCanvas mHardwareCanvas; 16679 16680 /** 16681 * The top view of the hierarchy. 16682 */ 16683 View mRootView; 16684 16685 IBinder mPanelParentWindowToken; 16686 Surface mSurface; 16687 16688 boolean mHardwareAccelerated; 16689 boolean mHardwareAccelerationRequested; 16690 HardwareRenderer mHardwareRenderer; 16691 16692 boolean mScreenOn; 16693 16694 /** 16695 * Scale factor used by the compatibility mode 16696 */ 16697 float mApplicationScale; 16698 16699 /** 16700 * Indicates whether the application is in compatibility mode 16701 */ 16702 boolean mScalingRequired; 16703 16704 /** 16705 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 16706 */ 16707 boolean mTurnOffWindowResizeAnim; 16708 16709 /** 16710 * Left position of this view's window 16711 */ 16712 int mWindowLeft; 16713 16714 /** 16715 * Top position of this view's window 16716 */ 16717 int mWindowTop; 16718 16719 /** 16720 * Indicates whether views need to use 32-bit drawing caches 16721 */ 16722 boolean mUse32BitDrawingCache; 16723 16724 /** 16725 * For windows that are full-screen but using insets to layout inside 16726 * of the screen decorations, these are the current insets for the 16727 * content of the window. 16728 */ 16729 final Rect mContentInsets = new Rect(); 16730 16731 /** 16732 * For windows that are full-screen but using insets to layout inside 16733 * of the screen decorations, these are the current insets for the 16734 * actual visible parts of the window. 16735 */ 16736 final Rect mVisibleInsets = new Rect(); 16737 16738 /** 16739 * The internal insets given by this window. This value is 16740 * supplied by the client (through 16741 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 16742 * be given to the window manager when changed to be used in laying 16743 * out windows behind it. 16744 */ 16745 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 16746 = new ViewTreeObserver.InternalInsetsInfo(); 16747 16748 /** 16749 * All views in the window's hierarchy that serve as scroll containers, 16750 * used to determine if the window can be resized or must be panned 16751 * to adjust for a soft input area. 16752 */ 16753 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 16754 16755 final KeyEvent.DispatcherState mKeyDispatchState 16756 = new KeyEvent.DispatcherState(); 16757 16758 /** 16759 * Indicates whether the view's window currently has the focus. 16760 */ 16761 boolean mHasWindowFocus; 16762 16763 /** 16764 * The current visibility of the window. 16765 */ 16766 int mWindowVisibility; 16767 16768 /** 16769 * Indicates the time at which drawing started to occur. 16770 */ 16771 long mDrawingTime; 16772 16773 /** 16774 * Indicates whether or not ignoring the DIRTY_MASK flags. 16775 */ 16776 boolean mIgnoreDirtyState; 16777 16778 /** 16779 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 16780 * to avoid clearing that flag prematurely. 16781 */ 16782 boolean mSetIgnoreDirtyState = false; 16783 16784 /** 16785 * Indicates whether the view's window is currently in touch mode. 16786 */ 16787 boolean mInTouchMode; 16788 16789 /** 16790 * Indicates that ViewAncestor should trigger a global layout change 16791 * the next time it performs a traversal 16792 */ 16793 boolean mRecomputeGlobalAttributes; 16794 16795 /** 16796 * Always report new attributes at next traversal. 16797 */ 16798 boolean mForceReportNewAttributes; 16799 16800 /** 16801 * Set during a traveral if any views want to keep the screen on. 16802 */ 16803 boolean mKeepScreenOn; 16804 16805 /** 16806 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 16807 */ 16808 int mSystemUiVisibility; 16809 16810 /** 16811 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 16812 * attached. 16813 */ 16814 boolean mHasSystemUiListeners; 16815 16816 /** 16817 * Set if the visibility of any views has changed. 16818 */ 16819 boolean mViewVisibilityChanged; 16820 16821 /** 16822 * Set to true if a view has been scrolled. 16823 */ 16824 boolean mViewScrollChanged; 16825 16826 /** 16827 * Global to the view hierarchy used as a temporary for dealing with 16828 * x/y points in the transparent region computations. 16829 */ 16830 final int[] mTransparentLocation = new int[2]; 16831 16832 /** 16833 * Global to the view hierarchy used as a temporary for dealing with 16834 * x/y points in the ViewGroup.invalidateChild implementation. 16835 */ 16836 final int[] mInvalidateChildLocation = new int[2]; 16837 16838 16839 /** 16840 * Global to the view hierarchy used as a temporary for dealing with 16841 * x/y location when view is transformed. 16842 */ 16843 final float[] mTmpTransformLocation = new float[2]; 16844 16845 /** 16846 * The view tree observer used to dispatch global events like 16847 * layout, pre-draw, touch mode change, etc. 16848 */ 16849 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 16850 16851 /** 16852 * A Canvas used by the view hierarchy to perform bitmap caching. 16853 */ 16854 Canvas mCanvas; 16855 16856 /** 16857 * The view root impl. 16858 */ 16859 final ViewRootImpl mViewRootImpl; 16860 16861 /** 16862 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 16863 * handler can be used to pump events in the UI events queue. 16864 */ 16865 final Handler mHandler; 16866 16867 /** 16868 * Temporary for use in computing invalidate rectangles while 16869 * calling up the hierarchy. 16870 */ 16871 final Rect mTmpInvalRect = new Rect(); 16872 16873 /** 16874 * Temporary for use in computing hit areas with transformed views 16875 */ 16876 final RectF mTmpTransformRect = new RectF(); 16877 16878 /** 16879 * Temporary list for use in collecting focusable descendents of a view. 16880 */ 16881 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 16882 16883 /** 16884 * The id of the window for accessibility purposes. 16885 */ 16886 int mAccessibilityWindowId = View.NO_ID; 16887 16888 /** 16889 * Whether to ingore not exposed for accessibility Views when 16890 * reporting the view tree to accessibility services. 16891 */ 16892 boolean mIncludeNotImportantViews; 16893 16894 /** 16895 * The drawable for highlighting accessibility focus. 16896 */ 16897 Drawable mAccessibilityFocusDrawable; 16898 16899 /** 16900 * Creates a new set of attachment information with the specified 16901 * events handler and thread. 16902 * 16903 * @param handler the events handler the view must use 16904 */ 16905 AttachInfo(IWindowSession session, IWindow window, 16906 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 16907 mSession = session; 16908 mWindow = window; 16909 mWindowToken = window.asBinder(); 16910 mViewRootImpl = viewRootImpl; 16911 mHandler = handler; 16912 mRootCallbacks = effectPlayer; 16913 } 16914 } 16915 16916 /** 16917 * <p>ScrollabilityCache holds various fields used by a View when scrolling 16918 * is supported. This avoids keeping too many unused fields in most 16919 * instances of View.</p> 16920 */ 16921 private static class ScrollabilityCache implements Runnable { 16922 16923 /** 16924 * Scrollbars are not visible 16925 */ 16926 public static final int OFF = 0; 16927 16928 /** 16929 * Scrollbars are visible 16930 */ 16931 public static final int ON = 1; 16932 16933 /** 16934 * Scrollbars are fading away 16935 */ 16936 public static final int FADING = 2; 16937 16938 public boolean fadeScrollBars; 16939 16940 public int fadingEdgeLength; 16941 public int scrollBarDefaultDelayBeforeFade; 16942 public int scrollBarFadeDuration; 16943 16944 public int scrollBarSize; 16945 public ScrollBarDrawable scrollBar; 16946 public float[] interpolatorValues; 16947 public View host; 16948 16949 public final Paint paint; 16950 public final Matrix matrix; 16951 public Shader shader; 16952 16953 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 16954 16955 private static final float[] OPAQUE = { 255 }; 16956 private static final float[] TRANSPARENT = { 0.0f }; 16957 16958 /** 16959 * When fading should start. This time moves into the future every time 16960 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 16961 */ 16962 public long fadeStartTime; 16963 16964 16965 /** 16966 * The current state of the scrollbars: ON, OFF, or FADING 16967 */ 16968 public int state = OFF; 16969 16970 private int mLastColor; 16971 16972 public ScrollabilityCache(ViewConfiguration configuration, View host) { 16973 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 16974 scrollBarSize = configuration.getScaledScrollBarSize(); 16975 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 16976 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 16977 16978 paint = new Paint(); 16979 matrix = new Matrix(); 16980 // use use a height of 1, and then wack the matrix each time we 16981 // actually use it. 16982 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 16983 16984 paint.setShader(shader); 16985 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 16986 this.host = host; 16987 } 16988 16989 public void setFadeColor(int color) { 16990 if (color != 0 && color != mLastColor) { 16991 mLastColor = color; 16992 color |= 0xFF000000; 16993 16994 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 16995 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 16996 16997 paint.setShader(shader); 16998 // Restore the default transfer mode (src_over) 16999 paint.setXfermode(null); 17000 } 17001 } 17002 17003 public void run() { 17004 long now = AnimationUtils.currentAnimationTimeMillis(); 17005 if (now >= fadeStartTime) { 17006 17007 // the animation fades the scrollbars out by changing 17008 // the opacity (alpha) from fully opaque to fully 17009 // transparent 17010 int nextFrame = (int) now; 17011 int framesCount = 0; 17012 17013 Interpolator interpolator = scrollBarInterpolator; 17014 17015 // Start opaque 17016 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17017 17018 // End transparent 17019 nextFrame += scrollBarFadeDuration; 17020 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17021 17022 state = FADING; 17023 17024 // Kick off the fade animation 17025 host.invalidate(true); 17026 } 17027 } 17028 } 17029 17030 /** 17031 * Resuable callback for sending 17032 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17033 */ 17034 private class SendViewScrolledAccessibilityEvent implements Runnable { 17035 public volatile boolean mIsPending; 17036 17037 public void run() { 17038 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17039 mIsPending = false; 17040 } 17041 } 17042 17043 /** 17044 * <p> 17045 * This class represents a delegate that can be registered in a {@link View} 17046 * to enhance accessibility support via composition rather via inheritance. 17047 * It is specifically targeted to widget developers that extend basic View 17048 * classes i.e. classes in package android.view, that would like their 17049 * applications to be backwards compatible. 17050 * </p> 17051 * <div class="special reference"> 17052 * <h3>Developer Guides</h3> 17053 * <p>For more information about making applications accessible, read the 17054 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17055 * developer guide.</p> 17056 * </div> 17057 * <p> 17058 * A scenario in which a developer would like to use an accessibility delegate 17059 * is overriding a method introduced in a later API version then the minimal API 17060 * version supported by the application. For example, the method 17061 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17062 * in API version 4 when the accessibility APIs were first introduced. If a 17063 * developer would like his application to run on API version 4 devices (assuming 17064 * all other APIs used by the application are version 4 or lower) and take advantage 17065 * of this method, instead of overriding the method which would break the application's 17066 * backwards compatibility, he can override the corresponding method in this 17067 * delegate and register the delegate in the target View if the API version of 17068 * the system is high enough i.e. the API version is same or higher to the API 17069 * version that introduced 17070 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17071 * </p> 17072 * <p> 17073 * Here is an example implementation: 17074 * </p> 17075 * <code><pre><p> 17076 * if (Build.VERSION.SDK_INT >= 14) { 17077 * // If the API version is equal of higher than the version in 17078 * // which onInitializeAccessibilityNodeInfo was introduced we 17079 * // register a delegate with a customized implementation. 17080 * View view = findViewById(R.id.view_id); 17081 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17082 * public void onInitializeAccessibilityNodeInfo(View host, 17083 * AccessibilityNodeInfo info) { 17084 * // Let the default implementation populate the info. 17085 * super.onInitializeAccessibilityNodeInfo(host, info); 17086 * // Set some other information. 17087 * info.setEnabled(host.isEnabled()); 17088 * } 17089 * }); 17090 * } 17091 * </code></pre></p> 17092 * <p> 17093 * This delegate contains methods that correspond to the accessibility methods 17094 * in View. If a delegate has been specified the implementation in View hands 17095 * off handling to the corresponding method in this delegate. The default 17096 * implementation the delegate methods behaves exactly as the corresponding 17097 * method in View for the case of no accessibility delegate been set. Hence, 17098 * to customize the behavior of a View method, clients can override only the 17099 * corresponding delegate method without altering the behavior of the rest 17100 * accessibility related methods of the host view. 17101 * </p> 17102 */ 17103 public static class AccessibilityDelegate { 17104 17105 /** 17106 * Sends an accessibility event of the given type. If accessibility is not 17107 * enabled this method has no effect. 17108 * <p> 17109 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17110 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17111 * been set. 17112 * </p> 17113 * 17114 * @param host The View hosting the delegate. 17115 * @param eventType The type of the event to send. 17116 * 17117 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17118 */ 17119 public void sendAccessibilityEvent(View host, int eventType) { 17120 host.sendAccessibilityEventInternal(eventType); 17121 } 17122 17123 /** 17124 * Sends an accessibility event. This method behaves exactly as 17125 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17126 * empty {@link AccessibilityEvent} and does not perform a check whether 17127 * accessibility is enabled. 17128 * <p> 17129 * The default implementation behaves as 17130 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17131 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17132 * the case of no accessibility delegate been set. 17133 * </p> 17134 * 17135 * @param host The View hosting the delegate. 17136 * @param event The event to send. 17137 * 17138 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17139 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17140 */ 17141 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17142 host.sendAccessibilityEventUncheckedInternal(event); 17143 } 17144 17145 /** 17146 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17147 * to its children for adding their text content to the event. 17148 * <p> 17149 * The default implementation behaves as 17150 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17151 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17152 * the case of no accessibility delegate been set. 17153 * </p> 17154 * 17155 * @param host The View hosting the delegate. 17156 * @param event The event. 17157 * @return True if the event population was completed. 17158 * 17159 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17160 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17161 */ 17162 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17163 return host.dispatchPopulateAccessibilityEventInternal(event); 17164 } 17165 17166 /** 17167 * Gives a chance to the host View to populate the accessibility event with its 17168 * text content. 17169 * <p> 17170 * The default implementation behaves as 17171 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17172 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17173 * the case of no accessibility delegate been set. 17174 * </p> 17175 * 17176 * @param host The View hosting the delegate. 17177 * @param event The accessibility event which to populate. 17178 * 17179 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17180 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17181 */ 17182 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17183 host.onPopulateAccessibilityEventInternal(event); 17184 } 17185 17186 /** 17187 * Initializes an {@link AccessibilityEvent} with information about the 17188 * the host View which is the event source. 17189 * <p> 17190 * The default implementation behaves as 17191 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17192 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17193 * the case of no accessibility delegate been set. 17194 * </p> 17195 * 17196 * @param host The View hosting the delegate. 17197 * @param event The event to initialize. 17198 * 17199 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17200 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17201 */ 17202 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17203 host.onInitializeAccessibilityEventInternal(event); 17204 } 17205 17206 /** 17207 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17208 * <p> 17209 * The default implementation behaves as 17210 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17211 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17212 * the case of no accessibility delegate been set. 17213 * </p> 17214 * 17215 * @param host The View hosting the delegate. 17216 * @param info The instance to initialize. 17217 * 17218 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17219 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17220 */ 17221 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17222 host.onInitializeAccessibilityNodeInfoInternal(info); 17223 } 17224 17225 /** 17226 * Called when a child of the host View has requested sending an 17227 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17228 * to augment the event. 17229 * <p> 17230 * The default implementation behaves as 17231 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17232 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17233 * the case of no accessibility delegate been set. 17234 * </p> 17235 * 17236 * @param host The View hosting the delegate. 17237 * @param child The child which requests sending the event. 17238 * @param event The event to be sent. 17239 * @return True if the event should be sent 17240 * 17241 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17242 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17243 */ 17244 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17245 AccessibilityEvent event) { 17246 return host.onRequestSendAccessibilityEventInternal(child, event); 17247 } 17248 17249 /** 17250 * Gets the provider for managing a virtual view hierarchy rooted at this View 17251 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17252 * that explore the window content. 17253 * <p> 17254 * The default implementation behaves as 17255 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17256 * the case of no accessibility delegate been set. 17257 * </p> 17258 * 17259 * @return The provider. 17260 * 17261 * @see AccessibilityNodeProvider 17262 */ 17263 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17264 return null; 17265 } 17266 } 17267} 17268