View.java revision f7280ccbfe6d71686a4e609ee7628f84e514a32d
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.content.ClipData; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Camera; 26import android.graphics.Canvas; 27import android.graphics.Interpolator; 28import android.graphics.LinearGradient; 29import android.graphics.Matrix; 30import android.graphics.Paint; 31import android.graphics.PixelFormat; 32import android.graphics.Point; 33import android.graphics.PorterDuff; 34import android.graphics.PorterDuffXfermode; 35import android.graphics.Rect; 36import android.graphics.RectF; 37import android.graphics.Region; 38import android.graphics.Shader; 39import android.graphics.drawable.ColorDrawable; 40import android.graphics.drawable.Drawable; 41import android.os.Handler; 42import android.os.IBinder; 43import android.os.Message; 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.*; 75 76import com.android.internal.R; 77import com.android.internal.util.Predicate; 78import com.android.internal.view.menu.MenuBuilder; 79 80import java.lang.ref.WeakReference; 81import java.lang.reflect.InvocationTargetException; 82import java.lang.reflect.Method; 83import java.util.ArrayList; 84import java.util.Arrays; 85import java.util.Locale; 86import java.util.concurrent.CopyOnWriteArrayList; 87 88/** 89 * <p> 90 * This class represents the basic building block for user interface components. A View 91 * occupies a rectangular area on the screen and is responsible for drawing and 92 * event handling. View is the base class for <em>widgets</em>, which are 93 * used to create interactive UI components (buttons, text fields, etc.). The 94 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 95 * are invisible containers that hold other Views (or other ViewGroups) and define 96 * their layout properties. 97 * </p> 98 * 99 * <div class="special reference"> 100 * <h3>Developer Guides</h3> 101 * <p>For information about using this class to develop your application's user interface, 102 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 103 * </div> 104 * 105 * <a name="Using"></a> 106 * <h3>Using Views</h3> 107 * <p> 108 * All of the views in a window are arranged in a single tree. You can add views 109 * either from code or by specifying a tree of views in one or more XML layout 110 * files. There are many specialized subclasses of views that act as controls or 111 * are capable of displaying text, images, or other content. 112 * </p> 113 * <p> 114 * Once you have created a tree of views, there are typically a few types of 115 * common operations you may wish to perform: 116 * <ul> 117 * <li><strong>Set properties:</strong> for example setting the text of a 118 * {@link android.widget.TextView}. The available properties and the methods 119 * that set them will vary among the different subclasses of views. Note that 120 * properties that are known at build time can be set in the XML layout 121 * files.</li> 122 * <li><strong>Set focus:</strong> The framework will handled moving focus in 123 * response to user input. To force focus to a specific view, call 124 * {@link #requestFocus}.</li> 125 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 126 * that will be notified when something interesting happens to the view. For 127 * example, all views will let you set a listener to be notified when the view 128 * gains or loses focus. You can register such a listener using 129 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 130 * Other view subclasses offer more specialized listeners. For example, a Button 131 * exposes a listener to notify clients when the button is clicked.</li> 132 * <li><strong>Set visibility:</strong> You can hide or show views using 133 * {@link #setVisibility(int)}.</li> 134 * </ul> 135 * </p> 136 * <p><em> 137 * Note: The Android framework is responsible for measuring, laying out and 138 * drawing views. You should not call methods that perform these actions on 139 * views yourself unless you are actually implementing a 140 * {@link android.view.ViewGroup}. 141 * </em></p> 142 * 143 * <a name="Lifecycle"></a> 144 * <h3>Implementing a Custom View</h3> 145 * 146 * <p> 147 * To implement a custom view, you will usually begin by providing overrides for 148 * some of the standard methods that the framework calls on all views. You do 149 * not need to override all of these methods. In fact, you can start by just 150 * overriding {@link #onDraw(android.graphics.Canvas)}. 151 * <table border="2" width="85%" align="center" cellpadding="5"> 152 * <thead> 153 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 154 * </thead> 155 * 156 * <tbody> 157 * <tr> 158 * <td rowspan="2">Creation</td> 159 * <td>Constructors</td> 160 * <td>There is a form of the constructor that are called when the view 161 * is created from code and a form that is called when the view is 162 * inflated from a layout file. The second form should parse and apply 163 * any attributes defined in the layout file. 164 * </td> 165 * </tr> 166 * <tr> 167 * <td><code>{@link #onFinishInflate()}</code></td> 168 * <td>Called after a view and all of its children has been inflated 169 * from XML.</td> 170 * </tr> 171 * 172 * <tr> 173 * <td rowspan="3">Layout</td> 174 * <td><code>{@link #onMeasure(int, int)}</code></td> 175 * <td>Called to determine the size requirements for this view and all 176 * of its children. 177 * </td> 178 * </tr> 179 * <tr> 180 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 181 * <td>Called when this view should assign a size and position to all 182 * of its children. 183 * </td> 184 * </tr> 185 * <tr> 186 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 187 * <td>Called when the size of this view has changed. 188 * </td> 189 * </tr> 190 * 191 * <tr> 192 * <td>Drawing</td> 193 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 194 * <td>Called when the view should render its content. 195 * </td> 196 * </tr> 197 * 198 * <tr> 199 * <td rowspan="4">Event processing</td> 200 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 201 * <td>Called when a new key event occurs. 202 * </td> 203 * </tr> 204 * <tr> 205 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 206 * <td>Called when a key up event occurs. 207 * </td> 208 * </tr> 209 * <tr> 210 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 211 * <td>Called when a trackball motion event occurs. 212 * </td> 213 * </tr> 214 * <tr> 215 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 216 * <td>Called when a touch screen motion event occurs. 217 * </td> 218 * </tr> 219 * 220 * <tr> 221 * <td rowspan="2">Focus</td> 222 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 223 * <td>Called when the view gains or loses focus. 224 * </td> 225 * </tr> 226 * 227 * <tr> 228 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 229 * <td>Called when the window containing the view gains or loses focus. 230 * </td> 231 * </tr> 232 * 233 * <tr> 234 * <td rowspan="3">Attaching</td> 235 * <td><code>{@link #onAttachedToWindow()}</code></td> 236 * <td>Called when the view is attached to a window. 237 * </td> 238 * </tr> 239 * 240 * <tr> 241 * <td><code>{@link #onDetachedFromWindow}</code></td> 242 * <td>Called when the view is detached from its window. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 248 * <td>Called when the visibility of the window containing the view 249 * has changed. 250 * </td> 251 * </tr> 252 * </tbody> 253 * 254 * </table> 255 * </p> 256 * 257 * <a name="IDs"></a> 258 * <h3>IDs</h3> 259 * Views may have an integer id associated with them. These ids are typically 260 * assigned in the layout XML files, and are used to find specific views within 261 * the view tree. A common pattern is to: 262 * <ul> 263 * <li>Define a Button in the layout file and assign it a unique ID. 264 * <pre> 265 * <Button 266 * android:id="@+id/my_button" 267 * android:layout_width="wrap_content" 268 * android:layout_height="wrap_content" 269 * android:text="@string/my_button_text"/> 270 * </pre></li> 271 * <li>From the onCreate method of an Activity, find the Button 272 * <pre class="prettyprint"> 273 * Button myButton = (Button) findViewById(R.id.my_button); 274 * </pre></li> 275 * </ul> 276 * <p> 277 * View IDs need not be unique throughout the tree, but it is good practice to 278 * ensure that they are at least unique within the part of the tree you are 279 * searching. 280 * </p> 281 * 282 * <a name="Position"></a> 283 * <h3>Position</h3> 284 * <p> 285 * The geometry of a view is that of a rectangle. A view has a location, 286 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 287 * two dimensions, expressed as a width and a height. The unit for location 288 * and dimensions is the pixel. 289 * </p> 290 * 291 * <p> 292 * It is possible to retrieve the location of a view by invoking the methods 293 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 294 * coordinate of the rectangle representing the view. The latter returns the 295 * top, or Y, coordinate of the rectangle representing the view. These methods 296 * both return the location of the view relative to its parent. For instance, 297 * when getLeft() returns 20, that means the view is located 20 pixels to the 298 * right of the left edge of its direct parent. 299 * </p> 300 * 301 * <p> 302 * In addition, several convenience methods are offered to avoid unnecessary 303 * computations, namely {@link #getRight()} and {@link #getBottom()}. 304 * These methods return the coordinates of the right and bottom edges of the 305 * rectangle representing the view. For instance, calling {@link #getRight()} 306 * is similar to the following computation: <code>getLeft() + getWidth()</code> 307 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 308 * </p> 309 * 310 * <a name="SizePaddingMargins"></a> 311 * <h3>Size, padding and margins</h3> 312 * <p> 313 * The size of a view is expressed with a width and a height. A view actually 314 * possess two pairs of width and height values. 315 * </p> 316 * 317 * <p> 318 * The first pair is known as <em>measured width</em> and 319 * <em>measured height</em>. These dimensions define how big a view wants to be 320 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 321 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 322 * and {@link #getMeasuredHeight()}. 323 * </p> 324 * 325 * <p> 326 * The second pair is simply known as <em>width</em> and <em>height</em>, or 327 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 328 * dimensions define the actual size of the view on screen, at drawing time and 329 * after layout. These values may, but do not have to, be different from the 330 * measured width and height. The width and height can be obtained by calling 331 * {@link #getWidth()} and {@link #getHeight()}. 332 * </p> 333 * 334 * <p> 335 * To measure its dimensions, a view takes into account its padding. The padding 336 * is expressed in pixels for the left, top, right and bottom parts of the view. 337 * Padding can be used to offset the content of the view by a specific amount of 338 * pixels. For instance, a left padding of 2 will push the view's content by 339 * 2 pixels to the right of the left edge. Padding can be set using the 340 * {@link #setPadding(int, int, int, int)} method and queried by calling 341 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 342 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}. 343 * </p> 344 * 345 * <p> 346 * Even though a view can define a padding, it does not provide any support for 347 * margins. However, view groups provide such a support. Refer to 348 * {@link android.view.ViewGroup} and 349 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 350 * </p> 351 * 352 * <a name="Layout"></a> 353 * <h3>Layout</h3> 354 * <p> 355 * Layout is a two pass process: a measure pass and a layout pass. The measuring 356 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 357 * of the view tree. Each view pushes dimension specifications down the tree 358 * during the recursion. At the end of the measure pass, every view has stored 359 * its measurements. The second pass happens in 360 * {@link #layout(int,int,int,int)} and is also top-down. During 361 * this pass each parent is responsible for positioning all of its children 362 * using the sizes computed in the measure pass. 363 * </p> 364 * 365 * <p> 366 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 367 * {@link #getMeasuredHeight()} values must be set, along with those for all of 368 * that view's descendants. A view's measured width and measured height values 369 * must respect the constraints imposed by the view's parents. This guarantees 370 * that at the end of the measure pass, all parents accept all of their 371 * children's measurements. A parent view may call measure() more than once on 372 * its children. For example, the parent may measure each child once with 373 * unspecified dimensions to find out how big they want to be, then call 374 * measure() on them again with actual numbers if the sum of all the children's 375 * unconstrained sizes is too big or too small. 376 * </p> 377 * 378 * <p> 379 * The measure pass uses two classes to communicate dimensions. The 380 * {@link MeasureSpec} class is used by views to tell their parents how they 381 * want to be measured and positioned. The base LayoutParams class just 382 * describes how big the view wants to be for both width and height. For each 383 * dimension, it can specify one of: 384 * <ul> 385 * <li> an exact number 386 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 387 * (minus padding) 388 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 389 * enclose its content (plus padding). 390 * </ul> 391 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 392 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 393 * an X and Y value. 394 * </p> 395 * 396 * <p> 397 * MeasureSpecs are used to push requirements down the tree from parent to 398 * child. A MeasureSpec can be in one of three modes: 399 * <ul> 400 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 401 * of a child view. For example, a LinearLayout may call measure() on its child 402 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 403 * tall the child view wants to be given a width of 240 pixels. 404 * <li>EXACTLY: This is used by the parent to impose an exact size on the 405 * child. The child must use this size, and guarantee that all of its 406 * descendants will fit within this size. 407 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 408 * child. The child must gurantee that it and all of its descendants will fit 409 * within this size. 410 * </ul> 411 * </p> 412 * 413 * <p> 414 * To intiate a layout, call {@link #requestLayout}. This method is typically 415 * called by a view on itself when it believes that is can no longer fit within 416 * its current bounds. 417 * </p> 418 * 419 * <a name="Drawing"></a> 420 * <h3>Drawing</h3> 421 * <p> 422 * Drawing is handled by walking the tree and rendering each view that 423 * intersects the invalid region. Because the tree is traversed in-order, 424 * this means that parents will draw before (i.e., behind) their children, with 425 * siblings drawn in the order they appear in the tree. 426 * If you set a background drawable for a View, then the View will draw it for you 427 * before calling back to its <code>onDraw()</code> method. 428 * </p> 429 * 430 * <p> 431 * Note that the framework will not draw views that are not in the invalid region. 432 * </p> 433 * 434 * <p> 435 * To force a view to draw, call {@link #invalidate()}. 436 * </p> 437 * 438 * <a name="EventHandlingThreading"></a> 439 * <h3>Event Handling and Threading</h3> 440 * <p> 441 * The basic cycle of a view is as follows: 442 * <ol> 443 * <li>An event comes in and is dispatched to the appropriate view. The view 444 * handles the event and notifies any listeners.</li> 445 * <li>If in the course of processing the event, the view's bounds may need 446 * to be changed, the view will call {@link #requestLayout()}.</li> 447 * <li>Similarly, if in the course of processing the event the view's appearance 448 * may need to be changed, the view will call {@link #invalidate()}.</li> 449 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 450 * the framework will take care of measuring, laying out, and drawing the tree 451 * as appropriate.</li> 452 * </ol> 453 * </p> 454 * 455 * <p><em>Note: The entire view tree is single threaded. You must always be on 456 * the UI thread when calling any method on any view.</em> 457 * If you are doing work on other threads and want to update the state of a view 458 * from that thread, you should use a {@link Handler}. 459 * </p> 460 * 461 * <a name="FocusHandling"></a> 462 * <h3>Focus Handling</h3> 463 * <p> 464 * The framework will handle routine focus movement in response to user input. 465 * This includes changing the focus as views are removed or hidden, or as new 466 * views become available. Views indicate their willingness to take focus 467 * through the {@link #isFocusable} method. To change whether a view can take 468 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 469 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 470 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 471 * </p> 472 * <p> 473 * Focus movement is based on an algorithm which finds the nearest neighbor in a 474 * given direction. In rare cases, the default algorithm may not match the 475 * intended behavior of the developer. In these situations, you can provide 476 * explicit overrides by using these XML attributes in the layout file: 477 * <pre> 478 * nextFocusDown 479 * nextFocusLeft 480 * nextFocusRight 481 * nextFocusUp 482 * </pre> 483 * </p> 484 * 485 * 486 * <p> 487 * To get a particular view to take focus, call {@link #requestFocus()}. 488 * </p> 489 * 490 * <a name="TouchMode"></a> 491 * <h3>Touch Mode</h3> 492 * <p> 493 * When a user is navigating a user interface via directional keys such as a D-pad, it is 494 * necessary to give focus to actionable items such as buttons so the user can see 495 * what will take input. If the device has touch capabilities, however, and the user 496 * begins interacting with the interface by touching it, it is no longer necessary to 497 * always highlight, or give focus to, a particular view. This motivates a mode 498 * for interaction named 'touch mode'. 499 * </p> 500 * <p> 501 * For a touch capable device, once the user touches the screen, the device 502 * will enter touch mode. From this point onward, only views for which 503 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 504 * Other views that are touchable, like buttons, will not take focus when touched; they will 505 * only fire the on click listeners. 506 * </p> 507 * <p> 508 * Any time a user hits a directional key, such as a D-pad direction, the view device will 509 * exit touch mode, and find a view to take focus, so that the user may resume interacting 510 * with the user interface without touching the screen again. 511 * </p> 512 * <p> 513 * The touch mode state is maintained across {@link android.app.Activity}s. Call 514 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 515 * </p> 516 * 517 * <a name="Scrolling"></a> 518 * <h3>Scrolling</h3> 519 * <p> 520 * The framework provides basic support for views that wish to internally 521 * scroll their content. This includes keeping track of the X and Y scroll 522 * offset as well as mechanisms for drawing scrollbars. See 523 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 524 * {@link #awakenScrollBars()} for more details. 525 * </p> 526 * 527 * <a name="Tags"></a> 528 * <h3>Tags</h3> 529 * <p> 530 * Unlike IDs, tags are not used to identify views. Tags are essentially an 531 * extra piece of information that can be associated with a view. They are most 532 * often used as a convenience to store data related to views in the views 533 * themselves rather than by putting them in a separate structure. 534 * </p> 535 * 536 * <a name="Animation"></a> 537 * <h3>Animation</h3> 538 * <p> 539 * You can attach an {@link Animation} object to a view using 540 * {@link #setAnimation(Animation)} or 541 * {@link #startAnimation(Animation)}. The animation can alter the scale, 542 * rotation, translation and alpha of a view over time. If the animation is 543 * attached to a view that has children, the animation will affect the entire 544 * subtree rooted by that node. When an animation is started, the framework will 545 * take care of redrawing the appropriate views until the animation completes. 546 * </p> 547 * <p> 548 * Starting with Android 3.0, the preferred way of animating views is to use the 549 * {@link android.animation} package APIs. 550 * </p> 551 * 552 * <a name="Security"></a> 553 * <h3>Security</h3> 554 * <p> 555 * Sometimes it is essential that an application be able to verify that an action 556 * is being performed with the full knowledge and consent of the user, such as 557 * granting a permission request, making a purchase or clicking on an advertisement. 558 * Unfortunately, a malicious application could try to spoof the user into 559 * performing these actions, unaware, by concealing the intended purpose of the view. 560 * As a remedy, the framework offers a touch filtering mechanism that can be used to 561 * improve the security of views that provide access to sensitive functionality. 562 * </p><p> 563 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 564 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 565 * will discard touches that are received whenever the view's window is obscured by 566 * another visible window. As a result, the view will not receive touches whenever a 567 * toast, dialog or other window appears above the view's window. 568 * </p><p> 569 * For more fine-grained control over security, consider overriding the 570 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 571 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 572 * </p> 573 * 574 * @attr ref android.R.styleable#View_alpha 575 * @attr ref android.R.styleable#View_background 576 * @attr ref android.R.styleable#View_clickable 577 * @attr ref android.R.styleable#View_contentDescription 578 * @attr ref android.R.styleable#View_drawingCacheQuality 579 * @attr ref android.R.styleable#View_duplicateParentState 580 * @attr ref android.R.styleable#View_id 581 * @attr ref android.R.styleable#View_requiresFadingEdge 582 * @attr ref android.R.styleable#View_fadingEdgeLength 583 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 584 * @attr ref android.R.styleable#View_fitsSystemWindows 585 * @attr ref android.R.styleable#View_isScrollContainer 586 * @attr ref android.R.styleable#View_focusable 587 * @attr ref android.R.styleable#View_focusableInTouchMode 588 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 589 * @attr ref android.R.styleable#View_keepScreenOn 590 * @attr ref android.R.styleable#View_layerType 591 * @attr ref android.R.styleable#View_longClickable 592 * @attr ref android.R.styleable#View_minHeight 593 * @attr ref android.R.styleable#View_minWidth 594 * @attr ref android.R.styleable#View_nextFocusDown 595 * @attr ref android.R.styleable#View_nextFocusLeft 596 * @attr ref android.R.styleable#View_nextFocusRight 597 * @attr ref android.R.styleable#View_nextFocusUp 598 * @attr ref android.R.styleable#View_onClick 599 * @attr ref android.R.styleable#View_padding 600 * @attr ref android.R.styleable#View_paddingBottom 601 * @attr ref android.R.styleable#View_paddingLeft 602 * @attr ref android.R.styleable#View_paddingRight 603 * @attr ref android.R.styleable#View_paddingTop 604 * @attr ref android.R.styleable#View_saveEnabled 605 * @attr ref android.R.styleable#View_rotation 606 * @attr ref android.R.styleable#View_rotationX 607 * @attr ref android.R.styleable#View_rotationY 608 * @attr ref android.R.styleable#View_scaleX 609 * @attr ref android.R.styleable#View_scaleY 610 * @attr ref android.R.styleable#View_scrollX 611 * @attr ref android.R.styleable#View_scrollY 612 * @attr ref android.R.styleable#View_scrollbarSize 613 * @attr ref android.R.styleable#View_scrollbarStyle 614 * @attr ref android.R.styleable#View_scrollbars 615 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 616 * @attr ref android.R.styleable#View_scrollbarFadeDuration 617 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 618 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 619 * @attr ref android.R.styleable#View_scrollbarThumbVertical 620 * @attr ref android.R.styleable#View_scrollbarTrackVertical 621 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 622 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 623 * @attr ref android.R.styleable#View_soundEffectsEnabled 624 * @attr ref android.R.styleable#View_tag 625 * @attr ref android.R.styleable#View_transformPivotX 626 * @attr ref android.R.styleable#View_transformPivotY 627 * @attr ref android.R.styleable#View_translationX 628 * @attr ref android.R.styleable#View_translationY 629 * @attr ref android.R.styleable#View_visibility 630 * 631 * @see android.view.ViewGroup 632 */ 633public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 634 AccessibilityEventSource { 635 private static final boolean DBG = false; 636 637 /** 638 * The logging tag used by this class with android.util.Log. 639 */ 640 protected static final String VIEW_LOG_TAG = "View"; 641 642 /** 643 * Used to mark a View that has no ID. 644 */ 645 public static final int NO_ID = -1; 646 647 /** 648 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 649 * calling setFlags. 650 */ 651 private static final int NOT_FOCUSABLE = 0x00000000; 652 653 /** 654 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 655 * setFlags. 656 */ 657 private static final int FOCUSABLE = 0x00000001; 658 659 /** 660 * Mask for use with setFlags indicating bits used for focus. 661 */ 662 private static final int FOCUSABLE_MASK = 0x00000001; 663 664 /** 665 * This view will adjust its padding to fit sytem windows (e.g. status bar) 666 */ 667 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 668 669 /** 670 * This view is visible. 671 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 672 * android:visibility}. 673 */ 674 public static final int VISIBLE = 0x00000000; 675 676 /** 677 * This view is invisible, but it still takes up space for layout purposes. 678 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 679 * android:visibility}. 680 */ 681 public static final int INVISIBLE = 0x00000004; 682 683 /** 684 * This view is invisible, and it doesn't take any space for layout 685 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 686 * android:visibility}. 687 */ 688 public static final int GONE = 0x00000008; 689 690 /** 691 * Mask for use with setFlags indicating bits used for visibility. 692 * {@hide} 693 */ 694 static final int VISIBILITY_MASK = 0x0000000C; 695 696 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 697 698 /** 699 * This view is enabled. Intrepretation varies by subclass. 700 * Use with ENABLED_MASK when calling setFlags. 701 * {@hide} 702 */ 703 static final int ENABLED = 0x00000000; 704 705 /** 706 * This view is disabled. Intrepretation varies by subclass. 707 * Use with ENABLED_MASK when calling setFlags. 708 * {@hide} 709 */ 710 static final int DISABLED = 0x00000020; 711 712 /** 713 * Mask for use with setFlags indicating bits used for indicating whether 714 * this view is enabled 715 * {@hide} 716 */ 717 static final int ENABLED_MASK = 0x00000020; 718 719 /** 720 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 721 * called and further optimizations will be performed. It is okay to have 722 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 723 * {@hide} 724 */ 725 static final int WILL_NOT_DRAW = 0x00000080; 726 727 /** 728 * Mask for use with setFlags indicating bits used for indicating whether 729 * this view is will draw 730 * {@hide} 731 */ 732 static final int DRAW_MASK = 0x00000080; 733 734 /** 735 * <p>This view doesn't show scrollbars.</p> 736 * {@hide} 737 */ 738 static final int SCROLLBARS_NONE = 0x00000000; 739 740 /** 741 * <p>This view shows horizontal scrollbars.</p> 742 * {@hide} 743 */ 744 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 745 746 /** 747 * <p>This view shows vertical scrollbars.</p> 748 * {@hide} 749 */ 750 static final int SCROLLBARS_VERTICAL = 0x00000200; 751 752 /** 753 * <p>Mask for use with setFlags indicating bits used for indicating which 754 * scrollbars are enabled.</p> 755 * {@hide} 756 */ 757 static final int SCROLLBARS_MASK = 0x00000300; 758 759 /** 760 * Indicates that the view should filter touches when its window is obscured. 761 * Refer to the class comments for more information about this security feature. 762 * {@hide} 763 */ 764 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 765 766 // note flag value 0x00000800 is now available for next flags... 767 768 /** 769 * <p>This view doesn't show fading edges.</p> 770 * {@hide} 771 */ 772 static final int FADING_EDGE_NONE = 0x00000000; 773 774 /** 775 * <p>This view shows horizontal fading edges.</p> 776 * {@hide} 777 */ 778 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 779 780 /** 781 * <p>This view shows vertical fading edges.</p> 782 * {@hide} 783 */ 784 static final int FADING_EDGE_VERTICAL = 0x00002000; 785 786 /** 787 * <p>Mask for use with setFlags indicating bits used for indicating which 788 * fading edges are enabled.</p> 789 * {@hide} 790 */ 791 static final int FADING_EDGE_MASK = 0x00003000; 792 793 /** 794 * <p>Indicates this view can be clicked. When clickable, a View reacts 795 * to clicks by notifying the OnClickListener.<p> 796 * {@hide} 797 */ 798 static final int CLICKABLE = 0x00004000; 799 800 /** 801 * <p>Indicates this view is caching its drawing into a bitmap.</p> 802 * {@hide} 803 */ 804 static final int DRAWING_CACHE_ENABLED = 0x00008000; 805 806 /** 807 * <p>Indicates that no icicle should be saved for this view.<p> 808 * {@hide} 809 */ 810 static final int SAVE_DISABLED = 0x000010000; 811 812 /** 813 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 814 * property.</p> 815 * {@hide} 816 */ 817 static final int SAVE_DISABLED_MASK = 0x000010000; 818 819 /** 820 * <p>Indicates that no drawing cache should ever be created for this view.<p> 821 * {@hide} 822 */ 823 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 824 825 /** 826 * <p>Indicates this view can take / keep focus when int touch mode.</p> 827 * {@hide} 828 */ 829 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 830 831 /** 832 * <p>Enables low quality mode for the drawing cache.</p> 833 */ 834 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 835 836 /** 837 * <p>Enables high quality mode for the drawing cache.</p> 838 */ 839 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 840 841 /** 842 * <p>Enables automatic quality mode for the drawing cache.</p> 843 */ 844 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 845 846 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 847 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 848 }; 849 850 /** 851 * <p>Mask for use with setFlags indicating bits used for the cache 852 * quality property.</p> 853 * {@hide} 854 */ 855 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 856 857 /** 858 * <p> 859 * Indicates this view can be long clicked. When long clickable, a View 860 * reacts to long clicks by notifying the OnLongClickListener or showing a 861 * context menu. 862 * </p> 863 * {@hide} 864 */ 865 static final int LONG_CLICKABLE = 0x00200000; 866 867 /** 868 * <p>Indicates that this view gets its drawable states from its direct parent 869 * and ignores its original internal states.</p> 870 * 871 * @hide 872 */ 873 static final int DUPLICATE_PARENT_STATE = 0x00400000; 874 875 /** 876 * The scrollbar style to display the scrollbars inside the content area, 877 * without increasing the padding. The scrollbars will be overlaid with 878 * translucency on the view's content. 879 */ 880 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 881 882 /** 883 * The scrollbar style to display the scrollbars inside the padded area, 884 * increasing the padding of the view. The scrollbars will not overlap the 885 * content area of the view. 886 */ 887 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 888 889 /** 890 * The scrollbar style to display the scrollbars at the edge of the view, 891 * without increasing the padding. The scrollbars will be overlaid with 892 * translucency. 893 */ 894 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 895 896 /** 897 * The scrollbar style to display the scrollbars at the edge of the view, 898 * increasing the padding of the view. The scrollbars will only overlap the 899 * background, if any. 900 */ 901 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 902 903 /** 904 * Mask to check if the scrollbar style is overlay or inset. 905 * {@hide} 906 */ 907 static final int SCROLLBARS_INSET_MASK = 0x01000000; 908 909 /** 910 * Mask to check if the scrollbar style is inside or outside. 911 * {@hide} 912 */ 913 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 914 915 /** 916 * Mask for scrollbar style. 917 * {@hide} 918 */ 919 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 920 921 /** 922 * View flag indicating that the screen should remain on while the 923 * window containing this view is visible to the user. This effectively 924 * takes care of automatically setting the WindowManager's 925 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 926 */ 927 public static final int KEEP_SCREEN_ON = 0x04000000; 928 929 /** 930 * View flag indicating whether this view should have sound effects enabled 931 * for events such as clicking and touching. 932 */ 933 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 934 935 /** 936 * View flag indicating whether this view should have haptic feedback 937 * enabled for events such as long presses. 938 */ 939 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 940 941 /** 942 * <p>Indicates that the view hierarchy should stop saving state when 943 * it reaches this view. If state saving is initiated immediately at 944 * the view, it will be allowed. 945 * {@hide} 946 */ 947 static final int PARENT_SAVE_DISABLED = 0x20000000; 948 949 /** 950 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 951 * {@hide} 952 */ 953 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 954 955 /** 956 * Horizontal direction of this view is from Left to Right. 957 * Use with {@link #setLayoutDirection}. 958 * {@hide} 959 */ 960 public static final int LAYOUT_DIRECTION_LTR = 0x00000000; 961 962 /** 963 * Horizontal direction of this view is from Right to Left. 964 * Use with {@link #setLayoutDirection}. 965 * {@hide} 966 */ 967 public static final int LAYOUT_DIRECTION_RTL = 0x40000000; 968 969 /** 970 * Horizontal direction of this view is inherited from its parent. 971 * Use with {@link #setLayoutDirection}. 972 * {@hide} 973 */ 974 public static final int LAYOUT_DIRECTION_INHERIT = 0x80000000; 975 976 /** 977 * Horizontal direction of this view is from deduced from the default language 978 * script for the locale. Use with {@link #setLayoutDirection}. 979 * {@hide} 980 */ 981 public static final int LAYOUT_DIRECTION_LOCALE = 0xC0000000; 982 983 /** 984 * Mask for use with setFlags indicating bits used for horizontalDirection. 985 * {@hide} 986 */ 987 static final int LAYOUT_DIRECTION_MASK = 0xC0000000; 988 989 /* 990 * Array of horizontal direction flags for mapping attribute "horizontalDirection" to correct 991 * flag value. 992 * {@hide} 993 */ 994 private static final int[] LAYOUT_DIRECTION_FLAGS = {LAYOUT_DIRECTION_LTR, 995 LAYOUT_DIRECTION_RTL, LAYOUT_DIRECTION_INHERIT, LAYOUT_DIRECTION_LOCALE}; 996 997 /** 998 * Default horizontalDirection. 999 * {@hide} 1000 */ 1001 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1002 1003 /** 1004 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1005 * should add all focusable Views regardless if they are focusable in touch mode. 1006 */ 1007 public static final int FOCUSABLES_ALL = 0x00000000; 1008 1009 /** 1010 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1011 * should add only Views focusable in touch mode. 1012 */ 1013 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1014 1015 /** 1016 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1017 * item. 1018 */ 1019 public static final int FOCUS_BACKWARD = 0x00000001; 1020 1021 /** 1022 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1023 * item. 1024 */ 1025 public static final int FOCUS_FORWARD = 0x00000002; 1026 1027 /** 1028 * Use with {@link #focusSearch(int)}. Move focus to the left. 1029 */ 1030 public static final int FOCUS_LEFT = 0x00000011; 1031 1032 /** 1033 * Use with {@link #focusSearch(int)}. Move focus up. 1034 */ 1035 public static final int FOCUS_UP = 0x00000021; 1036 1037 /** 1038 * Use with {@link #focusSearch(int)}. Move focus to the right. 1039 */ 1040 public static final int FOCUS_RIGHT = 0x00000042; 1041 1042 /** 1043 * Use with {@link #focusSearch(int)}. Move focus down. 1044 */ 1045 public static final int FOCUS_DOWN = 0x00000082; 1046 1047 /** 1048 * Bits of {@link #getMeasuredWidthAndState()} and 1049 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1050 */ 1051 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1052 1053 /** 1054 * Bits of {@link #getMeasuredWidthAndState()} and 1055 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1056 */ 1057 public static final int MEASURED_STATE_MASK = 0xff000000; 1058 1059 /** 1060 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1061 * for functions that combine both width and height into a single int, 1062 * such as {@link #getMeasuredState()} and the childState argument of 1063 * {@link #resolveSizeAndState(int, int, int)}. 1064 */ 1065 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1066 1067 /** 1068 * Bit of {@link #getMeasuredWidthAndState()} and 1069 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1070 * is smaller that the space the view would like to have. 1071 */ 1072 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1073 1074 /** 1075 * Base View state sets 1076 */ 1077 // Singles 1078 /** 1079 * Indicates the view has no states set. States are used with 1080 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1081 * view depending on its state. 1082 * 1083 * @see android.graphics.drawable.Drawable 1084 * @see #getDrawableState() 1085 */ 1086 protected static final int[] EMPTY_STATE_SET; 1087 /** 1088 * Indicates the view is enabled. States are used with 1089 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1090 * view depending on its state. 1091 * 1092 * @see android.graphics.drawable.Drawable 1093 * @see #getDrawableState() 1094 */ 1095 protected static final int[] ENABLED_STATE_SET; 1096 /** 1097 * Indicates the view is focused. States are used with 1098 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1099 * view depending on its state. 1100 * 1101 * @see android.graphics.drawable.Drawable 1102 * @see #getDrawableState() 1103 */ 1104 protected static final int[] FOCUSED_STATE_SET; 1105 /** 1106 * Indicates the view is selected. States are used with 1107 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1108 * view depending on its state. 1109 * 1110 * @see android.graphics.drawable.Drawable 1111 * @see #getDrawableState() 1112 */ 1113 protected static final int[] SELECTED_STATE_SET; 1114 /** 1115 * Indicates the view is pressed. States are used with 1116 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1117 * view depending on its state. 1118 * 1119 * @see android.graphics.drawable.Drawable 1120 * @see #getDrawableState() 1121 * @hide 1122 */ 1123 protected static final int[] PRESSED_STATE_SET; 1124 /** 1125 * Indicates the view's window has focus. 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[] WINDOW_FOCUSED_STATE_SET; 1133 // Doubles 1134 /** 1135 * Indicates the view is enabled and has the focus. 1136 * 1137 * @see #ENABLED_STATE_SET 1138 * @see #FOCUSED_STATE_SET 1139 */ 1140 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1141 /** 1142 * Indicates the view is enabled and selected. 1143 * 1144 * @see #ENABLED_STATE_SET 1145 * @see #SELECTED_STATE_SET 1146 */ 1147 protected static final int[] ENABLED_SELECTED_STATE_SET; 1148 /** 1149 * Indicates the view is enabled and that its window has focus. 1150 * 1151 * @see #ENABLED_STATE_SET 1152 * @see #WINDOW_FOCUSED_STATE_SET 1153 */ 1154 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1155 /** 1156 * Indicates the view is focused and selected. 1157 * 1158 * @see #FOCUSED_STATE_SET 1159 * @see #SELECTED_STATE_SET 1160 */ 1161 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1162 /** 1163 * Indicates the view has the focus and that its window has the focus. 1164 * 1165 * @see #FOCUSED_STATE_SET 1166 * @see #WINDOW_FOCUSED_STATE_SET 1167 */ 1168 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1169 /** 1170 * Indicates the view is selected and that its window has the focus. 1171 * 1172 * @see #SELECTED_STATE_SET 1173 * @see #WINDOW_FOCUSED_STATE_SET 1174 */ 1175 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1176 // Triples 1177 /** 1178 * Indicates the view is enabled, focused and selected. 1179 * 1180 * @see #ENABLED_STATE_SET 1181 * @see #FOCUSED_STATE_SET 1182 * @see #SELECTED_STATE_SET 1183 */ 1184 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1185 /** 1186 * Indicates the view is enabled, focused and its window has the focus. 1187 * 1188 * @see #ENABLED_STATE_SET 1189 * @see #FOCUSED_STATE_SET 1190 * @see #WINDOW_FOCUSED_STATE_SET 1191 */ 1192 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1193 /** 1194 * Indicates the view is enabled, selected and its window has the focus. 1195 * 1196 * @see #ENABLED_STATE_SET 1197 * @see #SELECTED_STATE_SET 1198 * @see #WINDOW_FOCUSED_STATE_SET 1199 */ 1200 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1201 /** 1202 * Indicates the view is focused, selected and its window has the focus. 1203 * 1204 * @see #FOCUSED_STATE_SET 1205 * @see #SELECTED_STATE_SET 1206 * @see #WINDOW_FOCUSED_STATE_SET 1207 */ 1208 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1209 /** 1210 * Indicates the view is enabled, focused, selected and its window 1211 * has the focus. 1212 * 1213 * @see #ENABLED_STATE_SET 1214 * @see #FOCUSED_STATE_SET 1215 * @see #SELECTED_STATE_SET 1216 * @see #WINDOW_FOCUSED_STATE_SET 1217 */ 1218 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1219 /** 1220 * Indicates the view is pressed and its window has the focus. 1221 * 1222 * @see #PRESSED_STATE_SET 1223 * @see #WINDOW_FOCUSED_STATE_SET 1224 */ 1225 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1226 /** 1227 * Indicates the view is pressed and selected. 1228 * 1229 * @see #PRESSED_STATE_SET 1230 * @see #SELECTED_STATE_SET 1231 */ 1232 protected static final int[] PRESSED_SELECTED_STATE_SET; 1233 /** 1234 * Indicates the view is pressed, selected and its window has the focus. 1235 * 1236 * @see #PRESSED_STATE_SET 1237 * @see #SELECTED_STATE_SET 1238 * @see #WINDOW_FOCUSED_STATE_SET 1239 */ 1240 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1241 /** 1242 * Indicates the view is pressed and focused. 1243 * 1244 * @see #PRESSED_STATE_SET 1245 * @see #FOCUSED_STATE_SET 1246 */ 1247 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1248 /** 1249 * Indicates the view is pressed, focused and its window has the focus. 1250 * 1251 * @see #PRESSED_STATE_SET 1252 * @see #FOCUSED_STATE_SET 1253 * @see #WINDOW_FOCUSED_STATE_SET 1254 */ 1255 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1256 /** 1257 * Indicates the view is pressed, focused and selected. 1258 * 1259 * @see #PRESSED_STATE_SET 1260 * @see #SELECTED_STATE_SET 1261 * @see #FOCUSED_STATE_SET 1262 */ 1263 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1264 /** 1265 * Indicates the view is pressed, focused, selected and its window has the focus. 1266 * 1267 * @see #PRESSED_STATE_SET 1268 * @see #FOCUSED_STATE_SET 1269 * @see #SELECTED_STATE_SET 1270 * @see #WINDOW_FOCUSED_STATE_SET 1271 */ 1272 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1273 /** 1274 * Indicates the view is pressed and enabled. 1275 * 1276 * @see #PRESSED_STATE_SET 1277 * @see #ENABLED_STATE_SET 1278 */ 1279 protected static final int[] PRESSED_ENABLED_STATE_SET; 1280 /** 1281 * Indicates the view is pressed, enabled and its window has the focus. 1282 * 1283 * @see #PRESSED_STATE_SET 1284 * @see #ENABLED_STATE_SET 1285 * @see #WINDOW_FOCUSED_STATE_SET 1286 */ 1287 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1288 /** 1289 * Indicates the view is pressed, enabled and selected. 1290 * 1291 * @see #PRESSED_STATE_SET 1292 * @see #ENABLED_STATE_SET 1293 * @see #SELECTED_STATE_SET 1294 */ 1295 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1296 /** 1297 * Indicates the view is pressed, enabled, selected and its window has the 1298 * focus. 1299 * 1300 * @see #PRESSED_STATE_SET 1301 * @see #ENABLED_STATE_SET 1302 * @see #SELECTED_STATE_SET 1303 * @see #WINDOW_FOCUSED_STATE_SET 1304 */ 1305 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1306 /** 1307 * Indicates the view is pressed, enabled and focused. 1308 * 1309 * @see #PRESSED_STATE_SET 1310 * @see #ENABLED_STATE_SET 1311 * @see #FOCUSED_STATE_SET 1312 */ 1313 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1314 /** 1315 * Indicates the view is pressed, enabled, focused and its window has the 1316 * focus. 1317 * 1318 * @see #PRESSED_STATE_SET 1319 * @see #ENABLED_STATE_SET 1320 * @see #FOCUSED_STATE_SET 1321 * @see #WINDOW_FOCUSED_STATE_SET 1322 */ 1323 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1324 /** 1325 * Indicates the view is pressed, enabled, focused and selected. 1326 * 1327 * @see #PRESSED_STATE_SET 1328 * @see #ENABLED_STATE_SET 1329 * @see #SELECTED_STATE_SET 1330 * @see #FOCUSED_STATE_SET 1331 */ 1332 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1333 /** 1334 * Indicates the view is pressed, enabled, focused, selected and its window 1335 * has the focus. 1336 * 1337 * @see #PRESSED_STATE_SET 1338 * @see #ENABLED_STATE_SET 1339 * @see #SELECTED_STATE_SET 1340 * @see #FOCUSED_STATE_SET 1341 * @see #WINDOW_FOCUSED_STATE_SET 1342 */ 1343 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1344 1345 /** 1346 * The order here is very important to {@link #getDrawableState()} 1347 */ 1348 private static final int[][] VIEW_STATE_SETS; 1349 1350 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1351 static final int VIEW_STATE_SELECTED = 1 << 1; 1352 static final int VIEW_STATE_FOCUSED = 1 << 2; 1353 static final int VIEW_STATE_ENABLED = 1 << 3; 1354 static final int VIEW_STATE_PRESSED = 1 << 4; 1355 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1356 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1357 static final int VIEW_STATE_HOVERED = 1 << 7; 1358 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1359 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1360 1361 static final int[] VIEW_STATE_IDS = new int[] { 1362 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1363 R.attr.state_selected, VIEW_STATE_SELECTED, 1364 R.attr.state_focused, VIEW_STATE_FOCUSED, 1365 R.attr.state_enabled, VIEW_STATE_ENABLED, 1366 R.attr.state_pressed, VIEW_STATE_PRESSED, 1367 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1368 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1369 R.attr.state_hovered, VIEW_STATE_HOVERED, 1370 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1371 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED, 1372 }; 1373 1374 static { 1375 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1376 throw new IllegalStateException( 1377 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1378 } 1379 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1380 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1381 int viewState = R.styleable.ViewDrawableStates[i]; 1382 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1383 if (VIEW_STATE_IDS[j] == viewState) { 1384 orderedIds[i * 2] = viewState; 1385 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1386 } 1387 } 1388 } 1389 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1390 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1391 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1392 int numBits = Integer.bitCount(i); 1393 int[] set = new int[numBits]; 1394 int pos = 0; 1395 for (int j = 0; j < orderedIds.length; j += 2) { 1396 if ((i & orderedIds[j+1]) != 0) { 1397 set[pos++] = orderedIds[j]; 1398 } 1399 } 1400 VIEW_STATE_SETS[i] = set; 1401 } 1402 1403 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1404 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1405 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1406 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1407 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1408 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1409 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1410 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1411 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1412 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1413 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1414 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1415 | VIEW_STATE_FOCUSED]; 1416 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1417 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1418 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1419 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1420 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1421 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1422 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1423 | VIEW_STATE_ENABLED]; 1424 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1425 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1426 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1427 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1428 | VIEW_STATE_ENABLED]; 1429 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1430 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1431 | VIEW_STATE_ENABLED]; 1432 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1433 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1434 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1435 1436 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1437 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1438 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1439 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1440 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1441 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1442 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1443 | VIEW_STATE_PRESSED]; 1444 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1445 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1446 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1448 | VIEW_STATE_PRESSED]; 1449 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1451 | VIEW_STATE_PRESSED]; 1452 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1453 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1454 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1455 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1456 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1457 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1459 | VIEW_STATE_PRESSED]; 1460 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1462 | VIEW_STATE_PRESSED]; 1463 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1464 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1465 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1466 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1467 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1468 | VIEW_STATE_PRESSED]; 1469 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1470 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1471 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1472 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1473 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1474 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1475 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1476 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1477 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1478 | VIEW_STATE_PRESSED]; 1479 } 1480 1481 /** 1482 * Accessibility event types that are dispatched for text population. 1483 */ 1484 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1485 AccessibilityEvent.TYPE_VIEW_CLICKED 1486 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1487 | AccessibilityEvent.TYPE_VIEW_SELECTED 1488 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1489 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1490 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1491 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1492 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1493 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED; 1494 1495 /** 1496 * Temporary Rect currently for use in setBackground(). This will probably 1497 * be extended in the future to hold our own class with more than just 1498 * a Rect. :) 1499 */ 1500 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1501 1502 /** 1503 * Map used to store views' tags. 1504 */ 1505 private SparseArray<Object> mKeyedTags; 1506 1507 /** 1508 * The next available accessiiblity id. 1509 */ 1510 private static int sNextAccessibilityViewId; 1511 1512 /** 1513 * The animation currently associated with this view. 1514 * @hide 1515 */ 1516 protected Animation mCurrentAnimation = null; 1517 1518 /** 1519 * Width as measured during measure pass. 1520 * {@hide} 1521 */ 1522 @ViewDebug.ExportedProperty(category = "measurement") 1523 int mMeasuredWidth; 1524 1525 /** 1526 * Height as measured during measure pass. 1527 * {@hide} 1528 */ 1529 @ViewDebug.ExportedProperty(category = "measurement") 1530 int mMeasuredHeight; 1531 1532 /** 1533 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1534 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1535 * its display list. This flag, used only when hw accelerated, allows us to clear the 1536 * flag while retaining this information until it's needed (at getDisplayList() time and 1537 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1538 * 1539 * {@hide} 1540 */ 1541 boolean mRecreateDisplayList = false; 1542 1543 /** 1544 * The view's identifier. 1545 * {@hide} 1546 * 1547 * @see #setId(int) 1548 * @see #getId() 1549 */ 1550 @ViewDebug.ExportedProperty(resolveId = true) 1551 int mID = NO_ID; 1552 1553 /** 1554 * The stable ID of this view for accessibility purposes. 1555 */ 1556 int mAccessibilityViewId = NO_ID; 1557 1558 /** 1559 * The view's tag. 1560 * {@hide} 1561 * 1562 * @see #setTag(Object) 1563 * @see #getTag() 1564 */ 1565 protected Object mTag; 1566 1567 // for mPrivateFlags: 1568 /** {@hide} */ 1569 static final int WANTS_FOCUS = 0x00000001; 1570 /** {@hide} */ 1571 static final int FOCUSED = 0x00000002; 1572 /** {@hide} */ 1573 static final int SELECTED = 0x00000004; 1574 /** {@hide} */ 1575 static final int IS_ROOT_NAMESPACE = 0x00000008; 1576 /** {@hide} */ 1577 static final int HAS_BOUNDS = 0x00000010; 1578 /** {@hide} */ 1579 static final int DRAWN = 0x00000020; 1580 /** 1581 * When this flag is set, this view is running an animation on behalf of its 1582 * children and should therefore not cancel invalidate requests, even if they 1583 * lie outside of this view's bounds. 1584 * 1585 * {@hide} 1586 */ 1587 static final int DRAW_ANIMATION = 0x00000040; 1588 /** {@hide} */ 1589 static final int SKIP_DRAW = 0x00000080; 1590 /** {@hide} */ 1591 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1592 /** {@hide} */ 1593 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1594 /** {@hide} */ 1595 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1596 /** {@hide} */ 1597 static final int MEASURED_DIMENSION_SET = 0x00000800; 1598 /** {@hide} */ 1599 static final int FORCE_LAYOUT = 0x00001000; 1600 /** {@hide} */ 1601 static final int LAYOUT_REQUIRED = 0x00002000; 1602 1603 private static final int PRESSED = 0x00004000; 1604 1605 /** {@hide} */ 1606 static final int DRAWING_CACHE_VALID = 0x00008000; 1607 /** 1608 * Flag used to indicate that this view should be drawn once more (and only once 1609 * more) after its animation has completed. 1610 * {@hide} 1611 */ 1612 static final int ANIMATION_STARTED = 0x00010000; 1613 1614 private static final int SAVE_STATE_CALLED = 0x00020000; 1615 1616 /** 1617 * Indicates that the View returned true when onSetAlpha() was called and that 1618 * the alpha must be restored. 1619 * {@hide} 1620 */ 1621 static final int ALPHA_SET = 0x00040000; 1622 1623 /** 1624 * Set by {@link #setScrollContainer(boolean)}. 1625 */ 1626 static final int SCROLL_CONTAINER = 0x00080000; 1627 1628 /** 1629 * Set by {@link #setScrollContainer(boolean)}. 1630 */ 1631 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1632 1633 /** 1634 * View flag indicating whether this view was invalidated (fully or partially.) 1635 * 1636 * @hide 1637 */ 1638 static final int DIRTY = 0x00200000; 1639 1640 /** 1641 * View flag indicating whether this view was invalidated by an opaque 1642 * invalidate request. 1643 * 1644 * @hide 1645 */ 1646 static final int DIRTY_OPAQUE = 0x00400000; 1647 1648 /** 1649 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1650 * 1651 * @hide 1652 */ 1653 static final int DIRTY_MASK = 0x00600000; 1654 1655 /** 1656 * Indicates whether the background is opaque. 1657 * 1658 * @hide 1659 */ 1660 static final int OPAQUE_BACKGROUND = 0x00800000; 1661 1662 /** 1663 * Indicates whether the scrollbars are opaque. 1664 * 1665 * @hide 1666 */ 1667 static final int OPAQUE_SCROLLBARS = 0x01000000; 1668 1669 /** 1670 * Indicates whether the view is opaque. 1671 * 1672 * @hide 1673 */ 1674 static final int OPAQUE_MASK = 0x01800000; 1675 1676 /** 1677 * Indicates a prepressed state; 1678 * the short time between ACTION_DOWN and recognizing 1679 * a 'real' press. Prepressed is used to recognize quick taps 1680 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1681 * 1682 * @hide 1683 */ 1684 private static final int PREPRESSED = 0x02000000; 1685 1686 /** 1687 * Indicates whether the view is temporarily detached. 1688 * 1689 * @hide 1690 */ 1691 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1692 1693 /** 1694 * Indicates that we should awaken scroll bars once attached 1695 * 1696 * @hide 1697 */ 1698 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1699 1700 /** 1701 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1702 * @hide 1703 */ 1704 private static final int HOVERED = 0x10000000; 1705 1706 /** 1707 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1708 * for transform operations 1709 * 1710 * @hide 1711 */ 1712 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1713 1714 /** {@hide} */ 1715 static final int ACTIVATED = 0x40000000; 1716 1717 /** 1718 * Indicates that this view was specifically invalidated, not just dirtied because some 1719 * child view was invalidated. The flag is used to determine when we need to recreate 1720 * a view's display list (as opposed to just returning a reference to its existing 1721 * display list). 1722 * 1723 * @hide 1724 */ 1725 static final int INVALIDATED = 0x80000000; 1726 1727 /* Masks for mPrivateFlags2 */ 1728 1729 /** 1730 * Indicates that this view has reported that it can accept the current drag's content. 1731 * Cleared when the drag operation concludes. 1732 * @hide 1733 */ 1734 static final int DRAG_CAN_ACCEPT = 0x00000001; 1735 1736 /** 1737 * Indicates that this view is currently directly under the drag location in a 1738 * drag-and-drop operation involving content that it can accept. Cleared when 1739 * the drag exits the view, or when the drag operation concludes. 1740 * @hide 1741 */ 1742 static final int DRAG_HOVERED = 0x00000002; 1743 1744 /** 1745 * Indicates whether the view layout direction has been resolved and drawn to the 1746 * right-to-left direction. 1747 * 1748 * @hide 1749 */ 1750 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 0x00000004; 1751 1752 /** 1753 * Indicates whether the view layout direction has been resolved. 1754 * 1755 * @hide 1756 */ 1757 static final int LAYOUT_DIRECTION_RESOLVED = 0x00000008; 1758 1759 1760 /* End of masks for mPrivateFlags2 */ 1761 1762 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 1763 1764 /** 1765 * Always allow a user to over-scroll this view, provided it is a 1766 * view that can scroll. 1767 * 1768 * @see #getOverScrollMode() 1769 * @see #setOverScrollMode(int) 1770 */ 1771 public static final int OVER_SCROLL_ALWAYS = 0; 1772 1773 /** 1774 * Allow a user to over-scroll this view only if the content is large 1775 * enough to meaningfully scroll, provided it is a view that can scroll. 1776 * 1777 * @see #getOverScrollMode() 1778 * @see #setOverScrollMode(int) 1779 */ 1780 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1781 1782 /** 1783 * Never allow a user to over-scroll this view. 1784 * 1785 * @see #getOverScrollMode() 1786 * @see #setOverScrollMode(int) 1787 */ 1788 public static final int OVER_SCROLL_NEVER = 2; 1789 1790 /** 1791 * View has requested the system UI (status bar) to be visible (the default). 1792 * 1793 * @see #setSystemUiVisibility(int) 1794 */ 1795 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 1796 1797 /** 1798 * View has requested the system UI to enter an unobtrusive "low profile" mode. 1799 * 1800 * This is for use in games, book readers, video players, or any other "immersive" application 1801 * where the usual system chrome is deemed too distracting. 1802 * 1803 * In low profile mode, the status bar and/or navigation icons may dim. 1804 * 1805 * @see #setSystemUiVisibility(int) 1806 */ 1807 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 1808 1809 /** 1810 * View has requested that the system navigation be temporarily hidden. 1811 * 1812 * This is an even less obtrusive state than that called for by 1813 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 1814 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 1815 * those to disappear. This is useful (in conjunction with the 1816 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 1817 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 1818 * window flags) for displaying content using every last pixel on the display. 1819 * 1820 * There is a limitation: because navigation controls are so important, the least user 1821 * interaction will cause them to reappear immediately. 1822 * 1823 * @see #setSystemUiVisibility(int) 1824 */ 1825 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 1826 1827 /** 1828 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 1829 */ 1830 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 1831 1832 /** 1833 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 1834 */ 1835 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 1836 1837 /** 1838 * @hide 1839 * 1840 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1841 * out of the public fields to keep the undefined bits out of the developer's way. 1842 * 1843 * Flag to make the status bar not expandable. Unless you also 1844 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 1845 */ 1846 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 1847 1848 /** 1849 * @hide 1850 * 1851 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1852 * out of the public fields to keep the undefined bits out of the developer's way. 1853 * 1854 * Flag to hide notification icons and scrolling ticker text. 1855 */ 1856 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 1857 1858 /** 1859 * @hide 1860 * 1861 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1862 * out of the public fields to keep the undefined bits out of the developer's way. 1863 * 1864 * Flag to disable incoming notification alerts. This will not block 1865 * icons, but it will block sound, vibrating and other visual or aural notifications. 1866 */ 1867 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 1868 1869 /** 1870 * @hide 1871 * 1872 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1873 * out of the public fields to keep the undefined bits out of the developer's way. 1874 * 1875 * Flag to hide only the scrolling ticker. Note that 1876 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 1877 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 1878 */ 1879 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 1880 1881 /** 1882 * @hide 1883 * 1884 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1885 * out of the public fields to keep the undefined bits out of the developer's way. 1886 * 1887 * Flag to hide the center system info area. 1888 */ 1889 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 1890 1891 /** 1892 * @hide 1893 * 1894 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1895 * out of the public fields to keep the undefined bits out of the developer's way. 1896 * 1897 * Flag to hide only the home button. Don't use this 1898 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1899 */ 1900 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 1901 1902 /** 1903 * @hide 1904 * 1905 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1906 * out of the public fields to keep the undefined bits out of the developer's way. 1907 * 1908 * Flag to hide only the back button. Don't use this 1909 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1910 */ 1911 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 1912 1913 /** 1914 * @hide 1915 * 1916 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1917 * out of the public fields to keep the undefined bits out of the developer's way. 1918 * 1919 * Flag to hide only the clock. You might use this if your activity has 1920 * its own clock making the status bar's clock redundant. 1921 */ 1922 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 1923 1924 /** 1925 * @hide 1926 * 1927 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1928 * out of the public fields to keep the undefined bits out of the developer's way. 1929 * 1930 * Flag to hide only the recent apps button. Don't use this 1931 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1932 */ 1933 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 1934 1935 /** 1936 * @hide 1937 * 1938 * NOTE: This flag may only be used in subtreeSystemUiVisibility, etc. etc. 1939 * 1940 * This hides HOME and RECENT and is provided for compatibility with interim implementations. 1941 */ 1942 @Deprecated 1943 public static final int STATUS_BAR_DISABLE_NAVIGATION = 1944 STATUS_BAR_DISABLE_HOME | STATUS_BAR_DISABLE_RECENT; 1945 1946 /** 1947 * @hide 1948 */ 1949 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 1950 1951 /** 1952 * These are the system UI flags that can be cleared by events outside 1953 * of an application. Currently this is just the ability to tap on the 1954 * screen while hiding the navigation bar to have it return. 1955 * @hide 1956 */ 1957 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 1958 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION; 1959 1960 /** 1961 * Find views that render the specified text. 1962 * 1963 * @see #findViewsWithText(ArrayList, CharSequence, int) 1964 */ 1965 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 1966 1967 /** 1968 * Find find views that contain the specified content description. 1969 * 1970 * @see #findViewsWithText(ArrayList, CharSequence, int) 1971 */ 1972 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 1973 1974 /** 1975 * Find views that contain {@link AccessibilityNodeProvider}. Such 1976 * a View is a root of virtual view hierarchy and may contain the searched 1977 * text. If this flag is set Views with providers are automatically 1978 * added and it is a responsibility of the client to call the APIs of 1979 * the provider to determine whether the virtual tree rooted at this View 1980 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 1981 * represeting the virtual views with this text. 1982 * 1983 * @see #findViewsWithText(ArrayList, CharSequence, int) 1984 * 1985 * @hide 1986 */ 1987 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 1988 1989 /** 1990 * Controls the over-scroll mode for this view. 1991 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1992 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1993 * and {@link #OVER_SCROLL_NEVER}. 1994 */ 1995 private int mOverScrollMode; 1996 1997 /** 1998 * The parent this view is attached to. 1999 * {@hide} 2000 * 2001 * @see #getParent() 2002 */ 2003 protected ViewParent mParent; 2004 2005 /** 2006 * {@hide} 2007 */ 2008 AttachInfo mAttachInfo; 2009 2010 /** 2011 * {@hide} 2012 */ 2013 @ViewDebug.ExportedProperty(flagMapping = { 2014 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2015 name = "FORCE_LAYOUT"), 2016 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2017 name = "LAYOUT_REQUIRED"), 2018 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2019 name = "DRAWING_CACHE_INVALID", outputIf = false), 2020 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2021 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2022 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2023 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2024 }) 2025 int mPrivateFlags; 2026 int mPrivateFlags2; 2027 2028 /** 2029 * This view's request for the visibility of the status bar. 2030 * @hide 2031 */ 2032 @ViewDebug.ExportedProperty(flagMapping = { 2033 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2034 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2035 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2036 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2037 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2038 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2039 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2040 equals = SYSTEM_UI_FLAG_VISIBLE, 2041 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2042 }) 2043 int mSystemUiVisibility; 2044 2045 /** 2046 * Count of how many windows this view has been attached to. 2047 */ 2048 int mWindowAttachCount; 2049 2050 /** 2051 * The layout parameters associated with this view and used by the parent 2052 * {@link android.view.ViewGroup} to determine how this view should be 2053 * laid out. 2054 * {@hide} 2055 */ 2056 protected ViewGroup.LayoutParams mLayoutParams; 2057 2058 /** 2059 * The view flags hold various views states. 2060 * {@hide} 2061 */ 2062 @ViewDebug.ExportedProperty 2063 int mViewFlags; 2064 2065 static class TransformationInfo { 2066 /** 2067 * The transform matrix for the View. This transform is calculated internally 2068 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2069 * is used by default. Do *not* use this variable directly; instead call 2070 * getMatrix(), which will automatically recalculate the matrix if necessary 2071 * to get the correct matrix based on the latest rotation and scale properties. 2072 */ 2073 private final Matrix mMatrix = new Matrix(); 2074 2075 /** 2076 * The transform matrix for the View. This transform is calculated internally 2077 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2078 * is used by default. Do *not* use this variable directly; instead call 2079 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2080 * to get the correct matrix based on the latest rotation and scale properties. 2081 */ 2082 private Matrix mInverseMatrix; 2083 2084 /** 2085 * An internal variable that tracks whether we need to recalculate the 2086 * transform matrix, based on whether the rotation or scaleX/Y properties 2087 * have changed since the matrix was last calculated. 2088 */ 2089 boolean mMatrixDirty = false; 2090 2091 /** 2092 * An internal variable that tracks whether we need to recalculate the 2093 * transform matrix, based on whether the rotation or scaleX/Y properties 2094 * have changed since the matrix was last calculated. 2095 */ 2096 private boolean mInverseMatrixDirty = true; 2097 2098 /** 2099 * A variable that tracks whether we need to recalculate the 2100 * transform matrix, based on whether the rotation or scaleX/Y properties 2101 * have changed since the matrix was last calculated. This variable 2102 * is only valid after a call to updateMatrix() or to a function that 2103 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2104 */ 2105 private boolean mMatrixIsIdentity = true; 2106 2107 /** 2108 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2109 */ 2110 private Camera mCamera = null; 2111 2112 /** 2113 * This matrix is used when computing the matrix for 3D rotations. 2114 */ 2115 private Matrix matrix3D = null; 2116 2117 /** 2118 * These prev values are used to recalculate a centered pivot point when necessary. The 2119 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2120 * set), so thes values are only used then as well. 2121 */ 2122 private int mPrevWidth = -1; 2123 private int mPrevHeight = -1; 2124 2125 /** 2126 * The degrees rotation around the vertical axis through the pivot point. 2127 */ 2128 @ViewDebug.ExportedProperty 2129 float mRotationY = 0f; 2130 2131 /** 2132 * The degrees rotation around the horizontal axis through the pivot point. 2133 */ 2134 @ViewDebug.ExportedProperty 2135 float mRotationX = 0f; 2136 2137 /** 2138 * The degrees rotation around the pivot point. 2139 */ 2140 @ViewDebug.ExportedProperty 2141 float mRotation = 0f; 2142 2143 /** 2144 * The amount of translation of the object away from its left property (post-layout). 2145 */ 2146 @ViewDebug.ExportedProperty 2147 float mTranslationX = 0f; 2148 2149 /** 2150 * The amount of translation of the object away from its top property (post-layout). 2151 */ 2152 @ViewDebug.ExportedProperty 2153 float mTranslationY = 0f; 2154 2155 /** 2156 * The amount of scale in the x direction around the pivot point. A 2157 * value of 1 means no scaling is applied. 2158 */ 2159 @ViewDebug.ExportedProperty 2160 float mScaleX = 1f; 2161 2162 /** 2163 * The amount of scale in the y direction around the pivot point. A 2164 * value of 1 means no scaling is applied. 2165 */ 2166 @ViewDebug.ExportedProperty 2167 float mScaleY = 1f; 2168 2169 /** 2170 * The x location of the point around which the view is rotated and scaled. 2171 */ 2172 @ViewDebug.ExportedProperty 2173 float mPivotX = 0f; 2174 2175 /** 2176 * The y location of the point around which the view is rotated and scaled. 2177 */ 2178 @ViewDebug.ExportedProperty 2179 float mPivotY = 0f; 2180 2181 /** 2182 * The opacity of the View. This is a value from 0 to 1, where 0 means 2183 * completely transparent and 1 means completely opaque. 2184 */ 2185 @ViewDebug.ExportedProperty 2186 float mAlpha = 1f; 2187 } 2188 2189 TransformationInfo mTransformationInfo; 2190 2191 private boolean mLastIsOpaque; 2192 2193 /** 2194 * Convenience value to check for float values that are close enough to zero to be considered 2195 * zero. 2196 */ 2197 private static final float NONZERO_EPSILON = .001f; 2198 2199 /** 2200 * The distance in pixels from the left edge of this view's parent 2201 * to the left edge of this view. 2202 * {@hide} 2203 */ 2204 @ViewDebug.ExportedProperty(category = "layout") 2205 protected int mLeft; 2206 /** 2207 * The distance in pixels from the left edge of this view's parent 2208 * to the right edge of this view. 2209 * {@hide} 2210 */ 2211 @ViewDebug.ExportedProperty(category = "layout") 2212 protected int mRight; 2213 /** 2214 * The distance in pixels from the top edge of this view's parent 2215 * to the top edge of this view. 2216 * {@hide} 2217 */ 2218 @ViewDebug.ExportedProperty(category = "layout") 2219 protected int mTop; 2220 /** 2221 * The distance in pixels from the top edge of this view's parent 2222 * to the bottom edge of this view. 2223 * {@hide} 2224 */ 2225 @ViewDebug.ExportedProperty(category = "layout") 2226 protected int mBottom; 2227 2228 /** 2229 * The offset, in pixels, by which the content of this view is scrolled 2230 * horizontally. 2231 * {@hide} 2232 */ 2233 @ViewDebug.ExportedProperty(category = "scrolling") 2234 protected int mScrollX; 2235 /** 2236 * The offset, in pixels, by which the content of this view is scrolled 2237 * vertically. 2238 * {@hide} 2239 */ 2240 @ViewDebug.ExportedProperty(category = "scrolling") 2241 protected int mScrollY; 2242 2243 /** 2244 * The left padding in pixels, that is the distance in pixels between the 2245 * left edge of this view and the left edge of its content. 2246 * {@hide} 2247 */ 2248 @ViewDebug.ExportedProperty(category = "padding") 2249 protected int mPaddingLeft; 2250 /** 2251 * The right padding in pixels, that is the distance in pixels between the 2252 * right edge of this view and the right edge of its content. 2253 * {@hide} 2254 */ 2255 @ViewDebug.ExportedProperty(category = "padding") 2256 protected int mPaddingRight; 2257 /** 2258 * The top padding in pixels, that is the distance in pixels between the 2259 * top edge of this view and the top edge of its content. 2260 * {@hide} 2261 */ 2262 @ViewDebug.ExportedProperty(category = "padding") 2263 protected int mPaddingTop; 2264 /** 2265 * The bottom padding in pixels, that is the distance in pixels between the 2266 * bottom edge of this view and the bottom edge of its content. 2267 * {@hide} 2268 */ 2269 @ViewDebug.ExportedProperty(category = "padding") 2270 protected int mPaddingBottom; 2271 2272 /** 2273 * Briefly describes the view and is primarily used for accessibility support. 2274 */ 2275 private CharSequence mContentDescription; 2276 2277 /** 2278 * Cache the paddingRight set by the user to append to the scrollbar's size. 2279 * 2280 * @hide 2281 */ 2282 @ViewDebug.ExportedProperty(category = "padding") 2283 protected int mUserPaddingRight; 2284 2285 /** 2286 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2287 * 2288 * @hide 2289 */ 2290 @ViewDebug.ExportedProperty(category = "padding") 2291 protected int mUserPaddingBottom; 2292 2293 /** 2294 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2295 * 2296 * @hide 2297 */ 2298 @ViewDebug.ExportedProperty(category = "padding") 2299 protected int mUserPaddingLeft; 2300 2301 /** 2302 * Cache if the user padding is relative. 2303 * 2304 */ 2305 @ViewDebug.ExportedProperty(category = "padding") 2306 boolean mUserPaddingRelative; 2307 2308 /** 2309 * Cache the paddingStart set by the user to append to the scrollbar's size. 2310 * 2311 */ 2312 @ViewDebug.ExportedProperty(category = "padding") 2313 int mUserPaddingStart; 2314 2315 /** 2316 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2317 * 2318 */ 2319 @ViewDebug.ExportedProperty(category = "padding") 2320 int mUserPaddingEnd; 2321 2322 /** 2323 * @hide 2324 */ 2325 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2326 /** 2327 * @hide 2328 */ 2329 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2330 2331 private Drawable mBGDrawable; 2332 2333 private int mBackgroundResource; 2334 private boolean mBackgroundSizeChanged; 2335 2336 static class ListenerInfo { 2337 /** 2338 * Listener used to dispatch focus change events. 2339 * This field should be made private, so it is hidden from the SDK. 2340 * {@hide} 2341 */ 2342 protected OnFocusChangeListener mOnFocusChangeListener; 2343 2344 /** 2345 * Listeners for layout change events. 2346 */ 2347 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2348 2349 /** 2350 * Listeners for attach events. 2351 */ 2352 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2353 2354 /** 2355 * Listener used to dispatch click events. 2356 * This field should be made private, so it is hidden from the SDK. 2357 * {@hide} 2358 */ 2359 public OnClickListener mOnClickListener; 2360 2361 /** 2362 * Listener used to dispatch long click events. 2363 * This field should be made private, so it is hidden from the SDK. 2364 * {@hide} 2365 */ 2366 protected OnLongClickListener mOnLongClickListener; 2367 2368 /** 2369 * Listener used to build the context menu. 2370 * This field should be made private, so it is hidden from the SDK. 2371 * {@hide} 2372 */ 2373 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2374 2375 private OnKeyListener mOnKeyListener; 2376 2377 private OnTouchListener mOnTouchListener; 2378 2379 private OnHoverListener mOnHoverListener; 2380 2381 private OnGenericMotionListener mOnGenericMotionListener; 2382 2383 private OnDragListener mOnDragListener; 2384 2385 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2386 } 2387 2388 ListenerInfo mListenerInfo; 2389 2390 /** 2391 * The application environment this view lives in. 2392 * This field should be made private, so it is hidden from the SDK. 2393 * {@hide} 2394 */ 2395 protected Context mContext; 2396 2397 private final Resources mResources; 2398 2399 private ScrollabilityCache mScrollCache; 2400 2401 private int[] mDrawableState = null; 2402 2403 /** 2404 * Set to true when drawing cache is enabled and cannot be created. 2405 * 2406 * @hide 2407 */ 2408 public boolean mCachingFailed; 2409 2410 private Bitmap mDrawingCache; 2411 private Bitmap mUnscaledDrawingCache; 2412 private HardwareLayer mHardwareLayer; 2413 DisplayList mDisplayList; 2414 2415 /** 2416 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2417 * the user may specify which view to go to next. 2418 */ 2419 private int mNextFocusLeftId = View.NO_ID; 2420 2421 /** 2422 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2423 * the user may specify which view to go to next. 2424 */ 2425 private int mNextFocusRightId = View.NO_ID; 2426 2427 /** 2428 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2429 * the user may specify which view to go to next. 2430 */ 2431 private int mNextFocusUpId = View.NO_ID; 2432 2433 /** 2434 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2435 * the user may specify which view to go to next. 2436 */ 2437 private int mNextFocusDownId = View.NO_ID; 2438 2439 /** 2440 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2441 * the user may specify which view to go to next. 2442 */ 2443 int mNextFocusForwardId = View.NO_ID; 2444 2445 private CheckForLongPress mPendingCheckForLongPress; 2446 private CheckForTap mPendingCheckForTap = null; 2447 private PerformClick mPerformClick; 2448 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2449 2450 private UnsetPressedState mUnsetPressedState; 2451 2452 /** 2453 * Whether the long press's action has been invoked. The tap's action is invoked on the 2454 * up event while a long press is invoked as soon as the long press duration is reached, so 2455 * a long press could be performed before the tap is checked, in which case the tap's action 2456 * should not be invoked. 2457 */ 2458 private boolean mHasPerformedLongPress; 2459 2460 /** 2461 * The minimum height of the view. We'll try our best to have the height 2462 * of this view to at least this amount. 2463 */ 2464 @ViewDebug.ExportedProperty(category = "measurement") 2465 private int mMinHeight; 2466 2467 /** 2468 * The minimum width of the view. We'll try our best to have the width 2469 * of this view to at least this amount. 2470 */ 2471 @ViewDebug.ExportedProperty(category = "measurement") 2472 private int mMinWidth; 2473 2474 /** 2475 * The delegate to handle touch events that are physically in this view 2476 * but should be handled by another view. 2477 */ 2478 private TouchDelegate mTouchDelegate = null; 2479 2480 /** 2481 * Solid color to use as a background when creating the drawing cache. Enables 2482 * the cache to use 16 bit bitmaps instead of 32 bit. 2483 */ 2484 private int mDrawingCacheBackgroundColor = 0; 2485 2486 /** 2487 * Special tree observer used when mAttachInfo is null. 2488 */ 2489 private ViewTreeObserver mFloatingTreeObserver; 2490 2491 /** 2492 * Cache the touch slop from the context that created the view. 2493 */ 2494 private int mTouchSlop; 2495 2496 /** 2497 * Object that handles automatic animation of view properties. 2498 */ 2499 private ViewPropertyAnimator mAnimator = null; 2500 2501 /** 2502 * Flag indicating that a drag can cross window boundaries. When 2503 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2504 * with this flag set, all visible applications will be able to participate 2505 * in the drag operation and receive the dragged content. 2506 * 2507 * @hide 2508 */ 2509 public static final int DRAG_FLAG_GLOBAL = 1; 2510 2511 /** 2512 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2513 */ 2514 private float mVerticalScrollFactor; 2515 2516 /** 2517 * Position of the vertical scroll bar. 2518 */ 2519 private int mVerticalScrollbarPosition; 2520 2521 /** 2522 * Position the scroll bar at the default position as determined by the system. 2523 */ 2524 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2525 2526 /** 2527 * Position the scroll bar along the left edge. 2528 */ 2529 public static final int SCROLLBAR_POSITION_LEFT = 1; 2530 2531 /** 2532 * Position the scroll bar along the right edge. 2533 */ 2534 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2535 2536 /** 2537 * Indicates that the view does not have a layer. 2538 * 2539 * @see #getLayerType() 2540 * @see #setLayerType(int, android.graphics.Paint) 2541 * @see #LAYER_TYPE_SOFTWARE 2542 * @see #LAYER_TYPE_HARDWARE 2543 */ 2544 public static final int LAYER_TYPE_NONE = 0; 2545 2546 /** 2547 * <p>Indicates that the view has a software layer. A software layer is backed 2548 * by a bitmap and causes the view to be rendered using Android's software 2549 * rendering pipeline, even if hardware acceleration is enabled.</p> 2550 * 2551 * <p>Software layers have various usages:</p> 2552 * <p>When the application is not using hardware acceleration, a software layer 2553 * is useful to apply a specific color filter and/or blending mode and/or 2554 * translucency to a view and all its children.</p> 2555 * <p>When the application is using hardware acceleration, a software layer 2556 * is useful to render drawing primitives not supported by the hardware 2557 * accelerated pipeline. It can also be used to cache a complex view tree 2558 * into a texture and reduce the complexity of drawing operations. For instance, 2559 * when animating a complex view tree with a translation, a software layer can 2560 * be used to render the view tree only once.</p> 2561 * <p>Software layers should be avoided when the affected view tree updates 2562 * often. Every update will require to re-render the software layer, which can 2563 * potentially be slow (particularly when hardware acceleration is turned on 2564 * since the layer will have to be uploaded into a hardware texture after every 2565 * update.)</p> 2566 * 2567 * @see #getLayerType() 2568 * @see #setLayerType(int, android.graphics.Paint) 2569 * @see #LAYER_TYPE_NONE 2570 * @see #LAYER_TYPE_HARDWARE 2571 */ 2572 public static final int LAYER_TYPE_SOFTWARE = 1; 2573 2574 /** 2575 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2576 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2577 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2578 * rendering pipeline, but only if hardware acceleration is turned on for the 2579 * view hierarchy. When hardware acceleration is turned off, hardware layers 2580 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2581 * 2582 * <p>A hardware layer is useful to apply a specific color filter and/or 2583 * blending mode and/or translucency to a view and all its children.</p> 2584 * <p>A hardware layer can be used to cache a complex view tree into a 2585 * texture and reduce the complexity of drawing operations. For instance, 2586 * when animating a complex view tree with a translation, a hardware layer can 2587 * be used to render the view tree only once.</p> 2588 * <p>A hardware layer can also be used to increase the rendering quality when 2589 * rotation transformations are applied on a view. It can also be used to 2590 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2591 * 2592 * @see #getLayerType() 2593 * @see #setLayerType(int, android.graphics.Paint) 2594 * @see #LAYER_TYPE_NONE 2595 * @see #LAYER_TYPE_SOFTWARE 2596 */ 2597 public static final int LAYER_TYPE_HARDWARE = 2; 2598 2599 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2600 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2601 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2602 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2603 }) 2604 int mLayerType = LAYER_TYPE_NONE; 2605 Paint mLayerPaint; 2606 Rect mLocalDirtyRect; 2607 2608 /** 2609 * Set to true when the view is sending hover accessibility events because it 2610 * is the innermost hovered view. 2611 */ 2612 private boolean mSendingHoverAccessibilityEvents; 2613 2614 /** 2615 * Delegate for injecting accessiblity functionality. 2616 */ 2617 AccessibilityDelegate mAccessibilityDelegate; 2618 2619 /** 2620 * Text direction is inherited thru {@link ViewGroup} 2621 */ 2622 public static final int TEXT_DIRECTION_INHERIT = 0; 2623 2624 /** 2625 * Text direction is using "first strong algorithm". The first strong directional character 2626 * determines the paragraph direction. If there is no strong directional character, the 2627 * paragraph direction is the view's resolved layout direction. 2628 * 2629 */ 2630 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 2631 2632 /** 2633 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 2634 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 2635 * If there are neither, the paragraph direction is the view's resolved layout direction. 2636 * 2637 */ 2638 public static final int TEXT_DIRECTION_ANY_RTL = 2; 2639 2640 /** 2641 * Text direction is forced to LTR. 2642 * 2643 */ 2644 public static final int TEXT_DIRECTION_LTR = 3; 2645 2646 /** 2647 * Text direction is forced to RTL. 2648 * 2649 */ 2650 public static final int TEXT_DIRECTION_RTL = 4; 2651 2652 /** 2653 * Text direction is coming from the system Locale. 2654 * 2655 */ 2656 public static final int TEXT_DIRECTION_LOCALE = 5; 2657 2658 /** 2659 * Default text direction is inherited 2660 * 2661 */ 2662 protected static int DEFAULT_TEXT_DIRECTION = TEXT_DIRECTION_INHERIT; 2663 2664 /** 2665 * The text direction that has been defined by {@link #setTextDirection(int)}. 2666 * 2667 */ 2668 @ViewDebug.ExportedProperty(category = "text", mapping = { 2669 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2670 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2671 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2672 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2673 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 2674 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 2675 }) 2676 private int mTextDirection = DEFAULT_TEXT_DIRECTION; 2677 2678 /** 2679 * The resolved text direction. This needs resolution if the value is 2680 * TEXT_DIRECTION_INHERIT. The resolution matches mTextDirection if it is 2681 * not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds up the parent 2682 * chain of the view. 2683 * 2684 */ 2685 @ViewDebug.ExportedProperty(category = "text", mapping = { 2686 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2687 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2688 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2689 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2690 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 2691 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 2692 }) 2693 private int mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 2694 2695 /** 2696 * Consistency verifier for debugging purposes. 2697 * @hide 2698 */ 2699 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 2700 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 2701 new InputEventConsistencyVerifier(this, 0) : null; 2702 2703 /** 2704 * Simple constructor to use when creating a view from code. 2705 * 2706 * @param context The Context the view is running in, through which it can 2707 * access the current theme, resources, etc. 2708 */ 2709 public View(Context context) { 2710 mContext = context; 2711 mResources = context != null ? context.getResources() : null; 2712 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED | LAYOUT_DIRECTION_INHERIT; 2713 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2714 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2715 mUserPaddingStart = -1; 2716 mUserPaddingEnd = -1; 2717 mUserPaddingRelative = false; 2718 } 2719 2720 /** 2721 * Constructor that is called when inflating a view from XML. This is called 2722 * when a view is being constructed from an XML file, supplying attributes 2723 * that were specified in the XML file. This version uses a default style of 2724 * 0, so the only attribute values applied are those in the Context's Theme 2725 * and the given AttributeSet. 2726 * 2727 * <p> 2728 * The method onFinishInflate() will be called after all children have been 2729 * added. 2730 * 2731 * @param context The Context the view is running in, through which it can 2732 * access the current theme, resources, etc. 2733 * @param attrs The attributes of the XML tag that is inflating the view. 2734 * @see #View(Context, AttributeSet, int) 2735 */ 2736 public View(Context context, AttributeSet attrs) { 2737 this(context, attrs, 0); 2738 } 2739 2740 /** 2741 * Perform inflation from XML and apply a class-specific base style. This 2742 * constructor of View allows subclasses to use their own base style when 2743 * they are inflating. For example, a Button class's constructor would call 2744 * this version of the super class constructor and supply 2745 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2746 * the theme's button style to modify all of the base view attributes (in 2747 * particular its background) as well as the Button class's attributes. 2748 * 2749 * @param context The Context the view is running in, through which it can 2750 * access the current theme, resources, etc. 2751 * @param attrs The attributes of the XML tag that is inflating the view. 2752 * @param defStyle The default style to apply to this view. If 0, no style 2753 * will be applied (beyond what is included in the theme). This may 2754 * either be an attribute resource, whose value will be retrieved 2755 * from the current theme, or an explicit style resource. 2756 * @see #View(Context, AttributeSet) 2757 */ 2758 public View(Context context, AttributeSet attrs, int defStyle) { 2759 this(context); 2760 2761 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2762 defStyle, 0); 2763 2764 Drawable background = null; 2765 2766 int leftPadding = -1; 2767 int topPadding = -1; 2768 int rightPadding = -1; 2769 int bottomPadding = -1; 2770 int startPadding = -1; 2771 int endPadding = -1; 2772 2773 int padding = -1; 2774 2775 int viewFlagValues = 0; 2776 int viewFlagMasks = 0; 2777 2778 boolean setScrollContainer = false; 2779 2780 int x = 0; 2781 int y = 0; 2782 2783 float tx = 0; 2784 float ty = 0; 2785 float rotation = 0; 2786 float rotationX = 0; 2787 float rotationY = 0; 2788 float sx = 1f; 2789 float sy = 1f; 2790 boolean transformSet = false; 2791 2792 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2793 2794 int overScrollMode = mOverScrollMode; 2795 final int N = a.getIndexCount(); 2796 for (int i = 0; i < N; i++) { 2797 int attr = a.getIndex(i); 2798 switch (attr) { 2799 case com.android.internal.R.styleable.View_background: 2800 background = a.getDrawable(attr); 2801 break; 2802 case com.android.internal.R.styleable.View_padding: 2803 padding = a.getDimensionPixelSize(attr, -1); 2804 break; 2805 case com.android.internal.R.styleable.View_paddingLeft: 2806 leftPadding = a.getDimensionPixelSize(attr, -1); 2807 break; 2808 case com.android.internal.R.styleable.View_paddingTop: 2809 topPadding = a.getDimensionPixelSize(attr, -1); 2810 break; 2811 case com.android.internal.R.styleable.View_paddingRight: 2812 rightPadding = a.getDimensionPixelSize(attr, -1); 2813 break; 2814 case com.android.internal.R.styleable.View_paddingBottom: 2815 bottomPadding = a.getDimensionPixelSize(attr, -1); 2816 break; 2817 case com.android.internal.R.styleable.View_paddingStart: 2818 startPadding = a.getDimensionPixelSize(attr, -1); 2819 break; 2820 case com.android.internal.R.styleable.View_paddingEnd: 2821 endPadding = a.getDimensionPixelSize(attr, -1); 2822 break; 2823 case com.android.internal.R.styleable.View_scrollX: 2824 x = a.getDimensionPixelOffset(attr, 0); 2825 break; 2826 case com.android.internal.R.styleable.View_scrollY: 2827 y = a.getDimensionPixelOffset(attr, 0); 2828 break; 2829 case com.android.internal.R.styleable.View_alpha: 2830 setAlpha(a.getFloat(attr, 1f)); 2831 break; 2832 case com.android.internal.R.styleable.View_transformPivotX: 2833 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2834 break; 2835 case com.android.internal.R.styleable.View_transformPivotY: 2836 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2837 break; 2838 case com.android.internal.R.styleable.View_translationX: 2839 tx = a.getDimensionPixelOffset(attr, 0); 2840 transformSet = true; 2841 break; 2842 case com.android.internal.R.styleable.View_translationY: 2843 ty = a.getDimensionPixelOffset(attr, 0); 2844 transformSet = true; 2845 break; 2846 case com.android.internal.R.styleable.View_rotation: 2847 rotation = a.getFloat(attr, 0); 2848 transformSet = true; 2849 break; 2850 case com.android.internal.R.styleable.View_rotationX: 2851 rotationX = a.getFloat(attr, 0); 2852 transformSet = true; 2853 break; 2854 case com.android.internal.R.styleable.View_rotationY: 2855 rotationY = a.getFloat(attr, 0); 2856 transformSet = true; 2857 break; 2858 case com.android.internal.R.styleable.View_scaleX: 2859 sx = a.getFloat(attr, 1f); 2860 transformSet = true; 2861 break; 2862 case com.android.internal.R.styleable.View_scaleY: 2863 sy = a.getFloat(attr, 1f); 2864 transformSet = true; 2865 break; 2866 case com.android.internal.R.styleable.View_id: 2867 mID = a.getResourceId(attr, NO_ID); 2868 break; 2869 case com.android.internal.R.styleable.View_tag: 2870 mTag = a.getText(attr); 2871 break; 2872 case com.android.internal.R.styleable.View_fitsSystemWindows: 2873 if (a.getBoolean(attr, false)) { 2874 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2875 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2876 } 2877 break; 2878 case com.android.internal.R.styleable.View_focusable: 2879 if (a.getBoolean(attr, false)) { 2880 viewFlagValues |= FOCUSABLE; 2881 viewFlagMasks |= FOCUSABLE_MASK; 2882 } 2883 break; 2884 case com.android.internal.R.styleable.View_focusableInTouchMode: 2885 if (a.getBoolean(attr, false)) { 2886 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2887 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2888 } 2889 break; 2890 case com.android.internal.R.styleable.View_clickable: 2891 if (a.getBoolean(attr, false)) { 2892 viewFlagValues |= CLICKABLE; 2893 viewFlagMasks |= CLICKABLE; 2894 } 2895 break; 2896 case com.android.internal.R.styleable.View_longClickable: 2897 if (a.getBoolean(attr, false)) { 2898 viewFlagValues |= LONG_CLICKABLE; 2899 viewFlagMasks |= LONG_CLICKABLE; 2900 } 2901 break; 2902 case com.android.internal.R.styleable.View_saveEnabled: 2903 if (!a.getBoolean(attr, true)) { 2904 viewFlagValues |= SAVE_DISABLED; 2905 viewFlagMasks |= SAVE_DISABLED_MASK; 2906 } 2907 break; 2908 case com.android.internal.R.styleable.View_duplicateParentState: 2909 if (a.getBoolean(attr, false)) { 2910 viewFlagValues |= DUPLICATE_PARENT_STATE; 2911 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2912 } 2913 break; 2914 case com.android.internal.R.styleable.View_visibility: 2915 final int visibility = a.getInt(attr, 0); 2916 if (visibility != 0) { 2917 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2918 viewFlagMasks |= VISIBILITY_MASK; 2919 } 2920 break; 2921 case com.android.internal.R.styleable.View_layoutDirection: 2922 // Clear any HORIZONTAL_DIRECTION flag already set 2923 viewFlagValues &= ~LAYOUT_DIRECTION_MASK; 2924 // Set the HORIZONTAL_DIRECTION flags depending on the value of the attribute 2925 final int layoutDirection = a.getInt(attr, -1); 2926 if (layoutDirection != -1) { 2927 viewFlagValues |= LAYOUT_DIRECTION_FLAGS[layoutDirection]; 2928 } else { 2929 // Set to default (LAYOUT_DIRECTION_INHERIT) 2930 viewFlagValues |= LAYOUT_DIRECTION_DEFAULT; 2931 } 2932 viewFlagMasks |= LAYOUT_DIRECTION_MASK; 2933 break; 2934 case com.android.internal.R.styleable.View_drawingCacheQuality: 2935 final int cacheQuality = a.getInt(attr, 0); 2936 if (cacheQuality != 0) { 2937 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2938 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2939 } 2940 break; 2941 case com.android.internal.R.styleable.View_contentDescription: 2942 mContentDescription = a.getString(attr); 2943 break; 2944 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2945 if (!a.getBoolean(attr, true)) { 2946 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2947 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2948 } 2949 break; 2950 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2951 if (!a.getBoolean(attr, true)) { 2952 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2953 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2954 } 2955 break; 2956 case R.styleable.View_scrollbars: 2957 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2958 if (scrollbars != SCROLLBARS_NONE) { 2959 viewFlagValues |= scrollbars; 2960 viewFlagMasks |= SCROLLBARS_MASK; 2961 initializeScrollbars(a); 2962 } 2963 break; 2964 //noinspection deprecation 2965 case R.styleable.View_fadingEdge: 2966 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 2967 // Ignore the attribute starting with ICS 2968 break; 2969 } 2970 // With builds < ICS, fall through and apply fading edges 2971 case R.styleable.View_requiresFadingEdge: 2972 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2973 if (fadingEdge != FADING_EDGE_NONE) { 2974 viewFlagValues |= fadingEdge; 2975 viewFlagMasks |= FADING_EDGE_MASK; 2976 initializeFadingEdge(a); 2977 } 2978 break; 2979 case R.styleable.View_scrollbarStyle: 2980 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2981 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2982 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2983 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2984 } 2985 break; 2986 case R.styleable.View_isScrollContainer: 2987 setScrollContainer = true; 2988 if (a.getBoolean(attr, false)) { 2989 setScrollContainer(true); 2990 } 2991 break; 2992 case com.android.internal.R.styleable.View_keepScreenOn: 2993 if (a.getBoolean(attr, false)) { 2994 viewFlagValues |= KEEP_SCREEN_ON; 2995 viewFlagMasks |= KEEP_SCREEN_ON; 2996 } 2997 break; 2998 case R.styleable.View_filterTouchesWhenObscured: 2999 if (a.getBoolean(attr, false)) { 3000 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3001 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3002 } 3003 break; 3004 case R.styleable.View_nextFocusLeft: 3005 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3006 break; 3007 case R.styleable.View_nextFocusRight: 3008 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3009 break; 3010 case R.styleable.View_nextFocusUp: 3011 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3012 break; 3013 case R.styleable.View_nextFocusDown: 3014 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3015 break; 3016 case R.styleable.View_nextFocusForward: 3017 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3018 break; 3019 case R.styleable.View_minWidth: 3020 mMinWidth = a.getDimensionPixelSize(attr, 0); 3021 break; 3022 case R.styleable.View_minHeight: 3023 mMinHeight = a.getDimensionPixelSize(attr, 0); 3024 break; 3025 case R.styleable.View_onClick: 3026 if (context.isRestricted()) { 3027 throw new IllegalStateException("The android:onClick attribute cannot " 3028 + "be used within a restricted context"); 3029 } 3030 3031 final String handlerName = a.getString(attr); 3032 if (handlerName != null) { 3033 setOnClickListener(new OnClickListener() { 3034 private Method mHandler; 3035 3036 public void onClick(View v) { 3037 if (mHandler == null) { 3038 try { 3039 mHandler = getContext().getClass().getMethod(handlerName, 3040 View.class); 3041 } catch (NoSuchMethodException e) { 3042 int id = getId(); 3043 String idText = id == NO_ID ? "" : " with id '" 3044 + getContext().getResources().getResourceEntryName( 3045 id) + "'"; 3046 throw new IllegalStateException("Could not find a method " + 3047 handlerName + "(View) in the activity " 3048 + getContext().getClass() + " for onClick handler" 3049 + " on view " + View.this.getClass() + idText, e); 3050 } 3051 } 3052 3053 try { 3054 mHandler.invoke(getContext(), View.this); 3055 } catch (IllegalAccessException e) { 3056 throw new IllegalStateException("Could not execute non " 3057 + "public method of the activity", e); 3058 } catch (InvocationTargetException e) { 3059 throw new IllegalStateException("Could not execute " 3060 + "method of the activity", e); 3061 } 3062 } 3063 }); 3064 } 3065 break; 3066 case R.styleable.View_overScrollMode: 3067 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3068 break; 3069 case R.styleable.View_verticalScrollbarPosition: 3070 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3071 break; 3072 case R.styleable.View_layerType: 3073 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3074 break; 3075 case R.styleable.View_textDirection: 3076 mTextDirection = a.getInt(attr, DEFAULT_TEXT_DIRECTION); 3077 break; 3078 } 3079 } 3080 3081 a.recycle(); 3082 3083 setOverScrollMode(overScrollMode); 3084 3085 if (background != null) { 3086 setBackgroundDrawable(background); 3087 } 3088 3089 mUserPaddingRelative = (startPadding >= 0 || endPadding >= 0); 3090 3091 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3092 // layout direction). Those cached values will be used later during padding resolution. 3093 mUserPaddingStart = startPadding; 3094 mUserPaddingEnd = endPadding; 3095 3096 if (padding >= 0) { 3097 leftPadding = padding; 3098 topPadding = padding; 3099 rightPadding = padding; 3100 bottomPadding = padding; 3101 } 3102 3103 // If the user specified the padding (either with android:padding or 3104 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3105 // use the default padding or the padding from the background drawable 3106 // (stored at this point in mPadding*) 3107 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3108 topPadding >= 0 ? topPadding : mPaddingTop, 3109 rightPadding >= 0 ? rightPadding : mPaddingRight, 3110 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3111 3112 if (viewFlagMasks != 0) { 3113 setFlags(viewFlagValues, viewFlagMasks); 3114 } 3115 3116 // Needs to be called after mViewFlags is set 3117 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3118 recomputePadding(); 3119 } 3120 3121 if (x != 0 || y != 0) { 3122 scrollTo(x, y); 3123 } 3124 3125 if (transformSet) { 3126 setTranslationX(tx); 3127 setTranslationY(ty); 3128 setRotation(rotation); 3129 setRotationX(rotationX); 3130 setRotationY(rotationY); 3131 setScaleX(sx); 3132 setScaleY(sy); 3133 } 3134 3135 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3136 setScrollContainer(true); 3137 } 3138 3139 computeOpaqueFlags(); 3140 } 3141 3142 /** 3143 * Non-public constructor for use in testing 3144 */ 3145 View() { 3146 mResources = null; 3147 } 3148 3149 /** 3150 * <p> 3151 * Initializes the fading edges from a given set of styled attributes. This 3152 * method should be called by subclasses that need fading edges and when an 3153 * instance of these subclasses is created programmatically rather than 3154 * being inflated from XML. This method is automatically called when the XML 3155 * is inflated. 3156 * </p> 3157 * 3158 * @param a the styled attributes set to initialize the fading edges from 3159 */ 3160 protected void initializeFadingEdge(TypedArray a) { 3161 initScrollCache(); 3162 3163 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3164 R.styleable.View_fadingEdgeLength, 3165 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3166 } 3167 3168 /** 3169 * Returns the size of the vertical faded edges used to indicate that more 3170 * content in this view is visible. 3171 * 3172 * @return The size in pixels of the vertical faded edge or 0 if vertical 3173 * faded edges are not enabled for this view. 3174 * @attr ref android.R.styleable#View_fadingEdgeLength 3175 */ 3176 public int getVerticalFadingEdgeLength() { 3177 if (isVerticalFadingEdgeEnabled()) { 3178 ScrollabilityCache cache = mScrollCache; 3179 if (cache != null) { 3180 return cache.fadingEdgeLength; 3181 } 3182 } 3183 return 0; 3184 } 3185 3186 /** 3187 * Set the size of the faded edge used to indicate that more content in this 3188 * view is available. Will not change whether the fading edge is enabled; use 3189 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3190 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3191 * for the vertical or horizontal fading edges. 3192 * 3193 * @param length The size in pixels of the faded edge used to indicate that more 3194 * content in this view is visible. 3195 */ 3196 public void setFadingEdgeLength(int length) { 3197 initScrollCache(); 3198 mScrollCache.fadingEdgeLength = length; 3199 } 3200 3201 /** 3202 * Returns the size of the horizontal faded edges used to indicate that more 3203 * content in this view is visible. 3204 * 3205 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3206 * faded edges are not enabled for this view. 3207 * @attr ref android.R.styleable#View_fadingEdgeLength 3208 */ 3209 public int getHorizontalFadingEdgeLength() { 3210 if (isHorizontalFadingEdgeEnabled()) { 3211 ScrollabilityCache cache = mScrollCache; 3212 if (cache != null) { 3213 return cache.fadingEdgeLength; 3214 } 3215 } 3216 return 0; 3217 } 3218 3219 /** 3220 * Returns the width of the vertical scrollbar. 3221 * 3222 * @return The width in pixels of the vertical scrollbar or 0 if there 3223 * is no vertical scrollbar. 3224 */ 3225 public int getVerticalScrollbarWidth() { 3226 ScrollabilityCache cache = mScrollCache; 3227 if (cache != null) { 3228 ScrollBarDrawable scrollBar = cache.scrollBar; 3229 if (scrollBar != null) { 3230 int size = scrollBar.getSize(true); 3231 if (size <= 0) { 3232 size = cache.scrollBarSize; 3233 } 3234 return size; 3235 } 3236 return 0; 3237 } 3238 return 0; 3239 } 3240 3241 /** 3242 * Returns the height of the horizontal scrollbar. 3243 * 3244 * @return The height in pixels of the horizontal scrollbar or 0 if 3245 * there is no horizontal scrollbar. 3246 */ 3247 protected int getHorizontalScrollbarHeight() { 3248 ScrollabilityCache cache = mScrollCache; 3249 if (cache != null) { 3250 ScrollBarDrawable scrollBar = cache.scrollBar; 3251 if (scrollBar != null) { 3252 int size = scrollBar.getSize(false); 3253 if (size <= 0) { 3254 size = cache.scrollBarSize; 3255 } 3256 return size; 3257 } 3258 return 0; 3259 } 3260 return 0; 3261 } 3262 3263 /** 3264 * <p> 3265 * Initializes the scrollbars from a given set of styled attributes. This 3266 * method should be called by subclasses that need scrollbars and when an 3267 * instance of these subclasses is created programmatically rather than 3268 * being inflated from XML. This method is automatically called when the XML 3269 * is inflated. 3270 * </p> 3271 * 3272 * @param a the styled attributes set to initialize the scrollbars from 3273 */ 3274 protected void initializeScrollbars(TypedArray a) { 3275 initScrollCache(); 3276 3277 final ScrollabilityCache scrollabilityCache = mScrollCache; 3278 3279 if (scrollabilityCache.scrollBar == null) { 3280 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3281 } 3282 3283 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3284 3285 if (!fadeScrollbars) { 3286 scrollabilityCache.state = ScrollabilityCache.ON; 3287 } 3288 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3289 3290 3291 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3292 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3293 .getScrollBarFadeDuration()); 3294 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3295 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3296 ViewConfiguration.getScrollDefaultDelay()); 3297 3298 3299 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3300 com.android.internal.R.styleable.View_scrollbarSize, 3301 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3302 3303 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3304 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3305 3306 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3307 if (thumb != null) { 3308 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3309 } 3310 3311 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3312 false); 3313 if (alwaysDraw) { 3314 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3315 } 3316 3317 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3318 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3319 3320 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3321 if (thumb != null) { 3322 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3323 } 3324 3325 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3326 false); 3327 if (alwaysDraw) { 3328 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3329 } 3330 3331 // Re-apply user/background padding so that scrollbar(s) get added 3332 resolvePadding(); 3333 } 3334 3335 /** 3336 * <p> 3337 * Initalizes the scrollability cache if necessary. 3338 * </p> 3339 */ 3340 private void initScrollCache() { 3341 if (mScrollCache == null) { 3342 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3343 } 3344 } 3345 3346 /** 3347 * Set the position of the vertical scroll bar. Should be one of 3348 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3349 * {@link #SCROLLBAR_POSITION_RIGHT}. 3350 * 3351 * @param position Where the vertical scroll bar should be positioned. 3352 */ 3353 public void setVerticalScrollbarPosition(int position) { 3354 if (mVerticalScrollbarPosition != position) { 3355 mVerticalScrollbarPosition = position; 3356 computeOpaqueFlags(); 3357 resolvePadding(); 3358 } 3359 } 3360 3361 /** 3362 * @return The position where the vertical scroll bar will show, if applicable. 3363 * @see #setVerticalScrollbarPosition(int) 3364 */ 3365 public int getVerticalScrollbarPosition() { 3366 return mVerticalScrollbarPosition; 3367 } 3368 3369 ListenerInfo getListenerInfo() { 3370 if (mListenerInfo != null) { 3371 return mListenerInfo; 3372 } 3373 mListenerInfo = new ListenerInfo(); 3374 return mListenerInfo; 3375 } 3376 3377 /** 3378 * Register a callback to be invoked when focus of this view changed. 3379 * 3380 * @param l The callback that will run. 3381 */ 3382 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3383 getListenerInfo().mOnFocusChangeListener = l; 3384 } 3385 3386 /** 3387 * Add a listener that will be called when the bounds of the view change due to 3388 * layout processing. 3389 * 3390 * @param listener The listener that will be called when layout bounds change. 3391 */ 3392 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3393 ListenerInfo li = getListenerInfo(); 3394 if (li.mOnLayoutChangeListeners == null) { 3395 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3396 } 3397 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3398 li.mOnLayoutChangeListeners.add(listener); 3399 } 3400 } 3401 3402 /** 3403 * Remove a listener for layout changes. 3404 * 3405 * @param listener The listener for layout bounds change. 3406 */ 3407 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3408 ListenerInfo li = mListenerInfo; 3409 if (li == null || li.mOnLayoutChangeListeners == null) { 3410 return; 3411 } 3412 li.mOnLayoutChangeListeners.remove(listener); 3413 } 3414 3415 /** 3416 * Add a listener for attach state changes. 3417 * 3418 * This listener will be called whenever this view is attached or detached 3419 * from a window. Remove the listener using 3420 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3421 * 3422 * @param listener Listener to attach 3423 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3424 */ 3425 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3426 ListenerInfo li = getListenerInfo(); 3427 if (li.mOnAttachStateChangeListeners == null) { 3428 li.mOnAttachStateChangeListeners 3429 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3430 } 3431 li.mOnAttachStateChangeListeners.add(listener); 3432 } 3433 3434 /** 3435 * Remove a listener for attach state changes. The listener will receive no further 3436 * notification of window attach/detach events. 3437 * 3438 * @param listener Listener to remove 3439 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3440 */ 3441 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3442 ListenerInfo li = mListenerInfo; 3443 if (li == null || li.mOnAttachStateChangeListeners == null) { 3444 return; 3445 } 3446 li.mOnAttachStateChangeListeners.remove(listener); 3447 } 3448 3449 /** 3450 * Returns the focus-change callback registered for this view. 3451 * 3452 * @return The callback, or null if one is not registered. 3453 */ 3454 public OnFocusChangeListener getOnFocusChangeListener() { 3455 ListenerInfo li = mListenerInfo; 3456 return li != null ? li.mOnFocusChangeListener : null; 3457 } 3458 3459 /** 3460 * Register a callback to be invoked when this view is clicked. If this view is not 3461 * clickable, it becomes clickable. 3462 * 3463 * @param l The callback that will run 3464 * 3465 * @see #setClickable(boolean) 3466 */ 3467 public void setOnClickListener(OnClickListener l) { 3468 if (!isClickable()) { 3469 setClickable(true); 3470 } 3471 getListenerInfo().mOnClickListener = l; 3472 } 3473 3474 /** 3475 * Return whether this view has an attached OnClickListener. Returns 3476 * true if there is a listener, false if there is none. 3477 */ 3478 public boolean hasOnClickListeners() { 3479 ListenerInfo li = mListenerInfo; 3480 return (li != null && li.mOnClickListener != null); 3481 } 3482 3483 /** 3484 * Register a callback to be invoked when this view is clicked and held. If this view is not 3485 * long clickable, it becomes long clickable. 3486 * 3487 * @param l The callback that will run 3488 * 3489 * @see #setLongClickable(boolean) 3490 */ 3491 public void setOnLongClickListener(OnLongClickListener l) { 3492 if (!isLongClickable()) { 3493 setLongClickable(true); 3494 } 3495 getListenerInfo().mOnLongClickListener = l; 3496 } 3497 3498 /** 3499 * Register a callback to be invoked when the context menu for this view is 3500 * being built. If this view is not long clickable, it becomes long clickable. 3501 * 3502 * @param l The callback that will run 3503 * 3504 */ 3505 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3506 if (!isLongClickable()) { 3507 setLongClickable(true); 3508 } 3509 getListenerInfo().mOnCreateContextMenuListener = l; 3510 } 3511 3512 /** 3513 * Call this view's OnClickListener, if it is defined. Performs all normal 3514 * actions associated with clicking: reporting accessibility event, playing 3515 * a sound, etc. 3516 * 3517 * @return True there was an assigned OnClickListener that was called, false 3518 * otherwise is returned. 3519 */ 3520 public boolean performClick() { 3521 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3522 3523 ListenerInfo li = mListenerInfo; 3524 if (li != null && li.mOnClickListener != null) { 3525 playSoundEffect(SoundEffectConstants.CLICK); 3526 li.mOnClickListener.onClick(this); 3527 return true; 3528 } 3529 3530 return false; 3531 } 3532 3533 /** 3534 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3535 * this only calls the listener, and does not do any associated clicking 3536 * actions like reporting an accessibility event. 3537 * 3538 * @return True there was an assigned OnClickListener that was called, false 3539 * otherwise is returned. 3540 */ 3541 public boolean callOnClick() { 3542 ListenerInfo li = mListenerInfo; 3543 if (li != null && li.mOnClickListener != null) { 3544 li.mOnClickListener.onClick(this); 3545 return true; 3546 } 3547 return false; 3548 } 3549 3550 /** 3551 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3552 * OnLongClickListener did not consume the event. 3553 * 3554 * @return True if one of the above receivers consumed the event, false otherwise. 3555 */ 3556 public boolean performLongClick() { 3557 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3558 3559 boolean handled = false; 3560 ListenerInfo li = mListenerInfo; 3561 if (li != null && li.mOnLongClickListener != null) { 3562 handled = li.mOnLongClickListener.onLongClick(View.this); 3563 } 3564 if (!handled) { 3565 handled = showContextMenu(); 3566 } 3567 if (handled) { 3568 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3569 } 3570 return handled; 3571 } 3572 3573 /** 3574 * Performs button-related actions during a touch down event. 3575 * 3576 * @param event The event. 3577 * @return True if the down was consumed. 3578 * 3579 * @hide 3580 */ 3581 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3582 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3583 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3584 return true; 3585 } 3586 } 3587 return false; 3588 } 3589 3590 /** 3591 * Bring up the context menu for this view. 3592 * 3593 * @return Whether a context menu was displayed. 3594 */ 3595 public boolean showContextMenu() { 3596 return getParent().showContextMenuForChild(this); 3597 } 3598 3599 /** 3600 * Bring up the context menu for this view, referring to the item under the specified point. 3601 * 3602 * @param x The referenced x coordinate. 3603 * @param y The referenced y coordinate. 3604 * @param metaState The keyboard modifiers that were pressed. 3605 * @return Whether a context menu was displayed. 3606 * 3607 * @hide 3608 */ 3609 public boolean showContextMenu(float x, float y, int metaState) { 3610 return showContextMenu(); 3611 } 3612 3613 /** 3614 * Start an action mode. 3615 * 3616 * @param callback Callback that will control the lifecycle of the action mode 3617 * @return The new action mode if it is started, null otherwise 3618 * 3619 * @see ActionMode 3620 */ 3621 public ActionMode startActionMode(ActionMode.Callback callback) { 3622 return getParent().startActionModeForChild(this, callback); 3623 } 3624 3625 /** 3626 * Register a callback to be invoked when a key is pressed in this view. 3627 * @param l the key listener to attach to this view 3628 */ 3629 public void setOnKeyListener(OnKeyListener l) { 3630 getListenerInfo().mOnKeyListener = l; 3631 } 3632 3633 /** 3634 * Register a callback to be invoked when a touch event is sent to this view. 3635 * @param l the touch listener to attach to this view 3636 */ 3637 public void setOnTouchListener(OnTouchListener l) { 3638 getListenerInfo().mOnTouchListener = l; 3639 } 3640 3641 /** 3642 * Register a callback to be invoked when a generic motion event is sent to this view. 3643 * @param l the generic motion listener to attach to this view 3644 */ 3645 public void setOnGenericMotionListener(OnGenericMotionListener l) { 3646 getListenerInfo().mOnGenericMotionListener = l; 3647 } 3648 3649 /** 3650 * Register a callback to be invoked when a hover event is sent to this view. 3651 * @param l the hover listener to attach to this view 3652 */ 3653 public void setOnHoverListener(OnHoverListener l) { 3654 getListenerInfo().mOnHoverListener = l; 3655 } 3656 3657 /** 3658 * Register a drag event listener callback object for this View. The parameter is 3659 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 3660 * View, the system calls the 3661 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 3662 * @param l An implementation of {@link android.view.View.OnDragListener}. 3663 */ 3664 public void setOnDragListener(OnDragListener l) { 3665 getListenerInfo().mOnDragListener = l; 3666 } 3667 3668 /** 3669 * Give this view focus. This will cause 3670 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3671 * 3672 * Note: this does not check whether this {@link View} should get focus, it just 3673 * gives it focus no matter what. It should only be called internally by framework 3674 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3675 * 3676 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 3677 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 3678 * focus moved when requestFocus() is called. It may not always 3679 * apply, in which case use the default View.FOCUS_DOWN. 3680 * @param previouslyFocusedRect The rectangle of the view that had focus 3681 * prior in this View's coordinate system. 3682 */ 3683 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3684 if (DBG) { 3685 System.out.println(this + " requestFocus()"); 3686 } 3687 3688 if ((mPrivateFlags & FOCUSED) == 0) { 3689 mPrivateFlags |= FOCUSED; 3690 3691 if (mParent != null) { 3692 mParent.requestChildFocus(this, this); 3693 } 3694 3695 onFocusChanged(true, direction, previouslyFocusedRect); 3696 refreshDrawableState(); 3697 } 3698 } 3699 3700 /** 3701 * Request that a rectangle of this view be visible on the screen, 3702 * scrolling if necessary just enough. 3703 * 3704 * <p>A View should call this if it maintains some notion of which part 3705 * of its content is interesting. For example, a text editing view 3706 * should call this when its cursor moves. 3707 * 3708 * @param rectangle The rectangle. 3709 * @return Whether any parent scrolled. 3710 */ 3711 public boolean requestRectangleOnScreen(Rect rectangle) { 3712 return requestRectangleOnScreen(rectangle, false); 3713 } 3714 3715 /** 3716 * Request that a rectangle of this view be visible on the screen, 3717 * scrolling if necessary just enough. 3718 * 3719 * <p>A View should call this if it maintains some notion of which part 3720 * of its content is interesting. For example, a text editing view 3721 * should call this when its cursor moves. 3722 * 3723 * <p>When <code>immediate</code> is set to true, scrolling will not be 3724 * animated. 3725 * 3726 * @param rectangle The rectangle. 3727 * @param immediate True to forbid animated scrolling, false otherwise 3728 * @return Whether any parent scrolled. 3729 */ 3730 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3731 View child = this; 3732 ViewParent parent = mParent; 3733 boolean scrolled = false; 3734 while (parent != null) { 3735 scrolled |= parent.requestChildRectangleOnScreen(child, 3736 rectangle, immediate); 3737 3738 // offset rect so next call has the rectangle in the 3739 // coordinate system of its direct child. 3740 rectangle.offset(child.getLeft(), child.getTop()); 3741 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3742 3743 if (!(parent instanceof View)) { 3744 break; 3745 } 3746 3747 child = (View) parent; 3748 parent = child.getParent(); 3749 } 3750 return scrolled; 3751 } 3752 3753 /** 3754 * Called when this view wants to give up focus. If focus is cleared 3755 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 3756 * <p> 3757 * <strong>Note:</strong> When a View clears focus the framework is trying 3758 * to give focus to the first focusable View from the top. Hence, if this 3759 * View is the first from the top that can take focus, then its focus will 3760 * not be cleared nor will the focus change callback be invoked. 3761 * </p> 3762 */ 3763 public void clearFocus() { 3764 if (DBG) { 3765 System.out.println(this + " clearFocus()"); 3766 } 3767 3768 if ((mPrivateFlags & FOCUSED) != 0) { 3769 mPrivateFlags &= ~FOCUSED; 3770 3771 if (mParent != null) { 3772 mParent.clearChildFocus(this); 3773 } 3774 3775 onFocusChanged(false, 0, null); 3776 refreshDrawableState(); 3777 } 3778 } 3779 3780 /** 3781 * Called to clear the focus of a view that is about to be removed. 3782 * Doesn't call clearChildFocus, which prevents this view from taking 3783 * focus again before it has been removed from the parent 3784 */ 3785 void clearFocusForRemoval() { 3786 if ((mPrivateFlags & FOCUSED) != 0) { 3787 mPrivateFlags &= ~FOCUSED; 3788 3789 onFocusChanged(false, 0, null); 3790 refreshDrawableState(); 3791 3792 // The view cleared focus and invoked the callbacks, so now is the 3793 // time to give focus to the the first focusable from the top to 3794 // ensure that the gain focus is announced after clear focus. 3795 getRootView().requestFocus(FOCUS_FORWARD); 3796 } 3797 } 3798 3799 /** 3800 * Called internally by the view system when a new view is getting focus. 3801 * This is what clears the old focus. 3802 */ 3803 void unFocus() { 3804 if (DBG) { 3805 System.out.println(this + " unFocus()"); 3806 } 3807 3808 if ((mPrivateFlags & FOCUSED) != 0) { 3809 mPrivateFlags &= ~FOCUSED; 3810 3811 onFocusChanged(false, 0, null); 3812 refreshDrawableState(); 3813 } 3814 } 3815 3816 /** 3817 * Returns true if this view has focus iteself, or is the ancestor of the 3818 * view that has focus. 3819 * 3820 * @return True if this view has or contains focus, false otherwise. 3821 */ 3822 @ViewDebug.ExportedProperty(category = "focus") 3823 public boolean hasFocus() { 3824 return (mPrivateFlags & FOCUSED) != 0; 3825 } 3826 3827 /** 3828 * Returns true if this view is focusable or if it contains a reachable View 3829 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3830 * is a View whose parents do not block descendants focus. 3831 * 3832 * Only {@link #VISIBLE} views are considered focusable. 3833 * 3834 * @return True if the view is focusable or if the view contains a focusable 3835 * View, false otherwise. 3836 * 3837 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3838 */ 3839 public boolean hasFocusable() { 3840 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3841 } 3842 3843 /** 3844 * Called by the view system when the focus state of this view changes. 3845 * When the focus change event is caused by directional navigation, direction 3846 * and previouslyFocusedRect provide insight into where the focus is coming from. 3847 * When overriding, be sure to call up through to the super class so that 3848 * the standard focus handling will occur. 3849 * 3850 * @param gainFocus True if the View has focus; false otherwise. 3851 * @param direction The direction focus has moved when requestFocus() 3852 * is called to give this view focus. Values are 3853 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3854 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3855 * It may not always apply, in which case use the default. 3856 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3857 * system, of the previously focused view. If applicable, this will be 3858 * passed in as finer grained information about where the focus is coming 3859 * from (in addition to direction). Will be <code>null</code> otherwise. 3860 */ 3861 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3862 if (gainFocus) { 3863 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3864 } 3865 3866 InputMethodManager imm = InputMethodManager.peekInstance(); 3867 if (!gainFocus) { 3868 if (isPressed()) { 3869 setPressed(false); 3870 } 3871 if (imm != null && mAttachInfo != null 3872 && mAttachInfo.mHasWindowFocus) { 3873 imm.focusOut(this); 3874 } 3875 onFocusLost(); 3876 } else if (imm != null && mAttachInfo != null 3877 && mAttachInfo.mHasWindowFocus) { 3878 imm.focusIn(this); 3879 } 3880 3881 invalidate(true); 3882 ListenerInfo li = mListenerInfo; 3883 if (li != null && li.mOnFocusChangeListener != null) { 3884 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 3885 } 3886 3887 if (mAttachInfo != null) { 3888 mAttachInfo.mKeyDispatchState.reset(this); 3889 } 3890 } 3891 3892 /** 3893 * Sends an accessibility event of the given type. If accessiiblity is 3894 * not enabled this method has no effect. The default implementation calls 3895 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 3896 * to populate information about the event source (this View), then calls 3897 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 3898 * populate the text content of the event source including its descendants, 3899 * and last calls 3900 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 3901 * on its parent to resuest sending of the event to interested parties. 3902 * <p> 3903 * If an {@link AccessibilityDelegate} has been specified via calling 3904 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3905 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 3906 * responsible for handling this call. 3907 * </p> 3908 * 3909 * @param eventType The type of the event to send, as defined by several types from 3910 * {@link android.view.accessibility.AccessibilityEvent}, such as 3911 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 3912 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 3913 * 3914 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 3915 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3916 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 3917 * @see AccessibilityDelegate 3918 */ 3919 public void sendAccessibilityEvent(int eventType) { 3920 if (mAccessibilityDelegate != null) { 3921 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 3922 } else { 3923 sendAccessibilityEventInternal(eventType); 3924 } 3925 } 3926 3927 /** 3928 * @see #sendAccessibilityEvent(int) 3929 * 3930 * Note: Called from the default {@link AccessibilityDelegate}. 3931 */ 3932 void sendAccessibilityEventInternal(int eventType) { 3933 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3934 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3935 } 3936 } 3937 3938 /** 3939 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 3940 * takes as an argument an empty {@link AccessibilityEvent} and does not 3941 * perform a check whether accessibility is enabled. 3942 * <p> 3943 * If an {@link AccessibilityDelegate} has been specified via calling 3944 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3945 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 3946 * is responsible for handling this call. 3947 * </p> 3948 * 3949 * @param event The event to send. 3950 * 3951 * @see #sendAccessibilityEvent(int) 3952 */ 3953 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3954 if (mAccessibilityDelegate != null) { 3955 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 3956 } else { 3957 sendAccessibilityEventUncheckedInternal(event); 3958 } 3959 } 3960 3961 /** 3962 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 3963 * 3964 * Note: Called from the default {@link AccessibilityDelegate}. 3965 */ 3966 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 3967 if (!isShown()) { 3968 return; 3969 } 3970 onInitializeAccessibilityEvent(event); 3971 // Only a subset of accessibility events populates text content. 3972 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 3973 dispatchPopulateAccessibilityEvent(event); 3974 } 3975 // In the beginning we called #isShown(), so we know that getParent() is not null. 3976 getParent().requestSendAccessibilityEvent(this, event); 3977 } 3978 3979 /** 3980 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 3981 * to its children for adding their text content to the event. Note that the 3982 * event text is populated in a separate dispatch path since we add to the 3983 * event not only the text of the source but also the text of all its descendants. 3984 * A typical implementation will call 3985 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 3986 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3987 * on each child. Override this method if custom population of the event text 3988 * content is required. 3989 * <p> 3990 * If an {@link AccessibilityDelegate} has been specified via calling 3991 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3992 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 3993 * is responsible for handling this call. 3994 * </p> 3995 * <p> 3996 * <em>Note:</em> Accessibility events of certain types are not dispatched for 3997 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 3998 * </p> 3999 * 4000 * @param event The event. 4001 * 4002 * @return True if the event population was completed. 4003 */ 4004 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4005 if (mAccessibilityDelegate != null) { 4006 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4007 } else { 4008 return dispatchPopulateAccessibilityEventInternal(event); 4009 } 4010 } 4011 4012 /** 4013 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4014 * 4015 * Note: Called from the default {@link AccessibilityDelegate}. 4016 */ 4017 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4018 onPopulateAccessibilityEvent(event); 4019 return false; 4020 } 4021 4022 /** 4023 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4024 * giving a chance to this View to populate the accessibility event with its 4025 * text content. While this method is free to modify event 4026 * attributes other than text content, doing so should normally be performed in 4027 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4028 * <p> 4029 * Example: Adding formatted date string to an accessibility event in addition 4030 * to the text added by the super implementation: 4031 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4032 * super.onPopulateAccessibilityEvent(event); 4033 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4034 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4035 * mCurrentDate.getTimeInMillis(), flags); 4036 * event.getText().add(selectedDateUtterance); 4037 * }</pre> 4038 * <p> 4039 * If an {@link AccessibilityDelegate} has been specified via calling 4040 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4041 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4042 * is responsible for handling this call. 4043 * </p> 4044 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4045 * information to the event, in case the default implementation has basic information to add. 4046 * </p> 4047 * 4048 * @param event The accessibility event which to populate. 4049 * 4050 * @see #sendAccessibilityEvent(int) 4051 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4052 */ 4053 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4054 if (mAccessibilityDelegate != null) { 4055 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4056 } else { 4057 onPopulateAccessibilityEventInternal(event); 4058 } 4059 } 4060 4061 /** 4062 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4063 * 4064 * Note: Called from the default {@link AccessibilityDelegate}. 4065 */ 4066 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4067 4068 } 4069 4070 /** 4071 * Initializes an {@link AccessibilityEvent} with information about 4072 * this View which is the event source. In other words, the source of 4073 * an accessibility event is the view whose state change triggered firing 4074 * the event. 4075 * <p> 4076 * Example: Setting the password property of an event in addition 4077 * to properties set by the super implementation: 4078 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4079 * super.onInitializeAccessibilityEvent(event); 4080 * event.setPassword(true); 4081 * }</pre> 4082 * <p> 4083 * If an {@link AccessibilityDelegate} has been specified via calling 4084 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4085 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4086 * is responsible for handling this call. 4087 * </p> 4088 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4089 * information to the event, in case the default implementation has basic information to add. 4090 * </p> 4091 * @param event The event to initialize. 4092 * 4093 * @see #sendAccessibilityEvent(int) 4094 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4095 */ 4096 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4097 if (mAccessibilityDelegate != null) { 4098 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4099 } else { 4100 onInitializeAccessibilityEventInternal(event); 4101 } 4102 } 4103 4104 /** 4105 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4106 * 4107 * Note: Called from the default {@link AccessibilityDelegate}. 4108 */ 4109 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4110 event.setSource(this); 4111 event.setClassName(View.class.getName()); 4112 event.setPackageName(getContext().getPackageName()); 4113 event.setEnabled(isEnabled()); 4114 event.setContentDescription(mContentDescription); 4115 4116 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4117 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 4118 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4119 FOCUSABLES_ALL); 4120 event.setItemCount(focusablesTempList.size()); 4121 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4122 focusablesTempList.clear(); 4123 } 4124 } 4125 4126 /** 4127 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4128 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4129 * This method is responsible for obtaining an accessibility node info from a 4130 * pool of reusable instances and calling 4131 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4132 * initialize the former. 4133 * <p> 4134 * Note: The client is responsible for recycling the obtained instance by calling 4135 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4136 * </p> 4137 * 4138 * @return A populated {@link AccessibilityNodeInfo}. 4139 * 4140 * @see AccessibilityNodeInfo 4141 */ 4142 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4143 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4144 if (provider != null) { 4145 return provider.createAccessibilityNodeInfo(View.NO_ID); 4146 } else { 4147 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4148 onInitializeAccessibilityNodeInfo(info); 4149 return info; 4150 } 4151 } 4152 4153 /** 4154 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4155 * The base implementation sets: 4156 * <ul> 4157 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4158 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4159 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4160 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4161 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4162 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4163 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4164 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4165 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4166 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4167 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4168 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4169 * </ul> 4170 * <p> 4171 * Subclasses should override this method, call the super implementation, 4172 * and set additional attributes. 4173 * </p> 4174 * <p> 4175 * If an {@link AccessibilityDelegate} has been specified via calling 4176 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4177 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4178 * is responsible for handling this call. 4179 * </p> 4180 * 4181 * @param info The instance to initialize. 4182 */ 4183 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4184 if (mAccessibilityDelegate != null) { 4185 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4186 } else { 4187 onInitializeAccessibilityNodeInfoInternal(info); 4188 } 4189 } 4190 4191 /** 4192 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4193 * 4194 * Note: Called from the default {@link AccessibilityDelegate}. 4195 */ 4196 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4197 Rect bounds = mAttachInfo.mTmpInvalRect; 4198 getDrawingRect(bounds); 4199 info.setBoundsInParent(bounds); 4200 4201 int[] locationOnScreen = mAttachInfo.mInvalidateChildLocation; 4202 getLocationOnScreen(locationOnScreen); 4203 bounds.offsetTo(0, 0); 4204 bounds.offset(locationOnScreen[0], locationOnScreen[1]); 4205 info.setBoundsInScreen(bounds); 4206 4207 if ((mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 4208 ViewParent parent = getParent(); 4209 if (parent instanceof View) { 4210 View parentView = (View) parent; 4211 info.setParent(parentView); 4212 } 4213 } 4214 4215 info.setPackageName(mContext.getPackageName()); 4216 info.setClassName(View.class.getName()); 4217 info.setContentDescription(getContentDescription()); 4218 4219 info.setEnabled(isEnabled()); 4220 info.setClickable(isClickable()); 4221 info.setFocusable(isFocusable()); 4222 info.setFocused(isFocused()); 4223 info.setSelected(isSelected()); 4224 info.setLongClickable(isLongClickable()); 4225 4226 // TODO: These make sense only if we are in an AdapterView but all 4227 // views can be selected. Maybe from accessiiblity perspective 4228 // we should report as selectable view in an AdapterView. 4229 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4230 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4231 4232 if (isFocusable()) { 4233 if (isFocused()) { 4234 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4235 } else { 4236 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4237 } 4238 } 4239 } 4240 4241 /** 4242 * Sets a delegate for implementing accessibility support via compositon as 4243 * opposed to inheritance. The delegate's primary use is for implementing 4244 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4245 * 4246 * @param delegate The delegate instance. 4247 * 4248 * @see AccessibilityDelegate 4249 */ 4250 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4251 mAccessibilityDelegate = delegate; 4252 } 4253 4254 /** 4255 * Gets the provider for managing a virtual view hierarchy rooted at this View 4256 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4257 * that explore the window content. 4258 * <p> 4259 * If this method returns an instance, this instance is responsible for managing 4260 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4261 * View including the one representing the View itself. Similarly the returned 4262 * instance is responsible for performing accessibility actions on any virtual 4263 * view or the root view itself. 4264 * </p> 4265 * <p> 4266 * If an {@link AccessibilityDelegate} has been specified via calling 4267 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4268 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4269 * is responsible for handling this call. 4270 * </p> 4271 * 4272 * @return The provider. 4273 * 4274 * @see AccessibilityNodeProvider 4275 */ 4276 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4277 if (mAccessibilityDelegate != null) { 4278 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4279 } else { 4280 return null; 4281 } 4282 } 4283 4284 /** 4285 * Gets the unique identifier of this view on the screen for accessibility purposes. 4286 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4287 * 4288 * @return The view accessibility id. 4289 * 4290 * @hide 4291 */ 4292 public int getAccessibilityViewId() { 4293 if (mAccessibilityViewId == NO_ID) { 4294 mAccessibilityViewId = sNextAccessibilityViewId++; 4295 } 4296 return mAccessibilityViewId; 4297 } 4298 4299 /** 4300 * Gets the unique identifier of the window in which this View reseides. 4301 * 4302 * @return The window accessibility id. 4303 * 4304 * @hide 4305 */ 4306 public int getAccessibilityWindowId() { 4307 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4308 } 4309 4310 /** 4311 * Gets the {@link View} description. It briefly describes the view and is 4312 * primarily used for accessibility support. Set this property to enable 4313 * better accessibility support for your application. This is especially 4314 * true for views that do not have textual representation (For example, 4315 * ImageButton). 4316 * 4317 * @return The content descriptiopn. 4318 * 4319 * @attr ref android.R.styleable#View_contentDescription 4320 */ 4321 public CharSequence getContentDescription() { 4322 return mContentDescription; 4323 } 4324 4325 /** 4326 * Sets the {@link View} description. It briefly describes the view and is 4327 * primarily used for accessibility support. Set this property to enable 4328 * better accessibility support for your application. This is especially 4329 * true for views that do not have textual representation (For example, 4330 * ImageButton). 4331 * 4332 * @param contentDescription The content description. 4333 * 4334 * @attr ref android.R.styleable#View_contentDescription 4335 */ 4336 @RemotableViewMethod 4337 public void setContentDescription(CharSequence contentDescription) { 4338 mContentDescription = contentDescription; 4339 } 4340 4341 /** 4342 * Invoked whenever this view loses focus, either by losing window focus or by losing 4343 * focus within its window. This method can be used to clear any state tied to the 4344 * focus. For instance, if a button is held pressed with the trackball and the window 4345 * loses focus, this method can be used to cancel the press. 4346 * 4347 * Subclasses of View overriding this method should always call super.onFocusLost(). 4348 * 4349 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4350 * @see #onWindowFocusChanged(boolean) 4351 * 4352 * @hide pending API council approval 4353 */ 4354 protected void onFocusLost() { 4355 resetPressedState(); 4356 } 4357 4358 private void resetPressedState() { 4359 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4360 return; 4361 } 4362 4363 if (isPressed()) { 4364 setPressed(false); 4365 4366 if (!mHasPerformedLongPress) { 4367 removeLongPressCallback(); 4368 } 4369 } 4370 } 4371 4372 /** 4373 * Returns true if this view has focus 4374 * 4375 * @return True if this view has focus, false otherwise. 4376 */ 4377 @ViewDebug.ExportedProperty(category = "focus") 4378 public boolean isFocused() { 4379 return (mPrivateFlags & FOCUSED) != 0; 4380 } 4381 4382 /** 4383 * Find the view in the hierarchy rooted at this view that currently has 4384 * focus. 4385 * 4386 * @return The view that currently has focus, or null if no focused view can 4387 * be found. 4388 */ 4389 public View findFocus() { 4390 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4391 } 4392 4393 /** 4394 * Change whether this view is one of the set of scrollable containers in 4395 * its window. This will be used to determine whether the window can 4396 * resize or must pan when a soft input area is open -- scrollable 4397 * containers allow the window to use resize mode since the container 4398 * will appropriately shrink. 4399 */ 4400 public void setScrollContainer(boolean isScrollContainer) { 4401 if (isScrollContainer) { 4402 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4403 mAttachInfo.mScrollContainers.add(this); 4404 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4405 } 4406 mPrivateFlags |= SCROLL_CONTAINER; 4407 } else { 4408 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4409 mAttachInfo.mScrollContainers.remove(this); 4410 } 4411 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4412 } 4413 } 4414 4415 /** 4416 * Returns the quality of the drawing cache. 4417 * 4418 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4419 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4420 * 4421 * @see #setDrawingCacheQuality(int) 4422 * @see #setDrawingCacheEnabled(boolean) 4423 * @see #isDrawingCacheEnabled() 4424 * 4425 * @attr ref android.R.styleable#View_drawingCacheQuality 4426 */ 4427 public int getDrawingCacheQuality() { 4428 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4429 } 4430 4431 /** 4432 * Set the drawing cache quality of this view. This value is used only when the 4433 * drawing cache is enabled 4434 * 4435 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4436 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4437 * 4438 * @see #getDrawingCacheQuality() 4439 * @see #setDrawingCacheEnabled(boolean) 4440 * @see #isDrawingCacheEnabled() 4441 * 4442 * @attr ref android.R.styleable#View_drawingCacheQuality 4443 */ 4444 public void setDrawingCacheQuality(int quality) { 4445 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 4446 } 4447 4448 /** 4449 * Returns whether the screen should remain on, corresponding to the current 4450 * value of {@link #KEEP_SCREEN_ON}. 4451 * 4452 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 4453 * 4454 * @see #setKeepScreenOn(boolean) 4455 * 4456 * @attr ref android.R.styleable#View_keepScreenOn 4457 */ 4458 public boolean getKeepScreenOn() { 4459 return (mViewFlags & KEEP_SCREEN_ON) != 0; 4460 } 4461 4462 /** 4463 * Controls whether the screen should remain on, modifying the 4464 * value of {@link #KEEP_SCREEN_ON}. 4465 * 4466 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 4467 * 4468 * @see #getKeepScreenOn() 4469 * 4470 * @attr ref android.R.styleable#View_keepScreenOn 4471 */ 4472 public void setKeepScreenOn(boolean keepScreenOn) { 4473 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 4474 } 4475 4476 /** 4477 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4478 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4479 * 4480 * @attr ref android.R.styleable#View_nextFocusLeft 4481 */ 4482 public int getNextFocusLeftId() { 4483 return mNextFocusLeftId; 4484 } 4485 4486 /** 4487 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4488 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 4489 * decide automatically. 4490 * 4491 * @attr ref android.R.styleable#View_nextFocusLeft 4492 */ 4493 public void setNextFocusLeftId(int nextFocusLeftId) { 4494 mNextFocusLeftId = nextFocusLeftId; 4495 } 4496 4497 /** 4498 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4499 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4500 * 4501 * @attr ref android.R.styleable#View_nextFocusRight 4502 */ 4503 public int getNextFocusRightId() { 4504 return mNextFocusRightId; 4505 } 4506 4507 /** 4508 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4509 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 4510 * decide automatically. 4511 * 4512 * @attr ref android.R.styleable#View_nextFocusRight 4513 */ 4514 public void setNextFocusRightId(int nextFocusRightId) { 4515 mNextFocusRightId = nextFocusRightId; 4516 } 4517 4518 /** 4519 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4520 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4521 * 4522 * @attr ref android.R.styleable#View_nextFocusUp 4523 */ 4524 public int getNextFocusUpId() { 4525 return mNextFocusUpId; 4526 } 4527 4528 /** 4529 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4530 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 4531 * decide automatically. 4532 * 4533 * @attr ref android.R.styleable#View_nextFocusUp 4534 */ 4535 public void setNextFocusUpId(int nextFocusUpId) { 4536 mNextFocusUpId = nextFocusUpId; 4537 } 4538 4539 /** 4540 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4541 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4542 * 4543 * @attr ref android.R.styleable#View_nextFocusDown 4544 */ 4545 public int getNextFocusDownId() { 4546 return mNextFocusDownId; 4547 } 4548 4549 /** 4550 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4551 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 4552 * decide automatically. 4553 * 4554 * @attr ref android.R.styleable#View_nextFocusDown 4555 */ 4556 public void setNextFocusDownId(int nextFocusDownId) { 4557 mNextFocusDownId = nextFocusDownId; 4558 } 4559 4560 /** 4561 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4562 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4563 * 4564 * @attr ref android.R.styleable#View_nextFocusForward 4565 */ 4566 public int getNextFocusForwardId() { 4567 return mNextFocusForwardId; 4568 } 4569 4570 /** 4571 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4572 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 4573 * decide automatically. 4574 * 4575 * @attr ref android.R.styleable#View_nextFocusForward 4576 */ 4577 public void setNextFocusForwardId(int nextFocusForwardId) { 4578 mNextFocusForwardId = nextFocusForwardId; 4579 } 4580 4581 /** 4582 * Returns the visibility of this view and all of its ancestors 4583 * 4584 * @return True if this view and all of its ancestors are {@link #VISIBLE} 4585 */ 4586 public boolean isShown() { 4587 View current = this; 4588 //noinspection ConstantConditions 4589 do { 4590 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4591 return false; 4592 } 4593 ViewParent parent = current.mParent; 4594 if (parent == null) { 4595 return false; // We are not attached to the view root 4596 } 4597 if (!(parent instanceof View)) { 4598 return true; 4599 } 4600 current = (View) parent; 4601 } while (current != null); 4602 4603 return false; 4604 } 4605 4606 /** 4607 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 4608 * is set 4609 * 4610 * @param insets Insets for system windows 4611 * 4612 * @return True if this view applied the insets, false otherwise 4613 */ 4614 protected boolean fitSystemWindows(Rect insets) { 4615 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 4616 mPaddingLeft = insets.left; 4617 mPaddingTop = insets.top; 4618 mPaddingRight = insets.right; 4619 mPaddingBottom = insets.bottom; 4620 requestLayout(); 4621 return true; 4622 } 4623 return false; 4624 } 4625 4626 /** 4627 * Set whether or not this view should account for system screen decorations 4628 * such as the status bar and inset its content. This allows this view to be 4629 * positioned in absolute screen coordinates and remain visible to the user. 4630 * 4631 * <p>This should only be used by top-level window decor views. 4632 * 4633 * @param fitSystemWindows true to inset content for system screen decorations, false for 4634 * default behavior. 4635 * 4636 * @attr ref android.R.styleable#View_fitsSystemWindows 4637 */ 4638 public void setFitsSystemWindows(boolean fitSystemWindows) { 4639 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 4640 } 4641 4642 /** 4643 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 4644 * will account for system screen decorations such as the status bar and inset its 4645 * content. This allows the view to be positioned in absolute screen coordinates 4646 * and remain visible to the user. 4647 * 4648 * @return true if this view will adjust its content bounds for system screen decorations. 4649 * 4650 * @attr ref android.R.styleable#View_fitsSystemWindows 4651 */ 4652 public boolean fitsSystemWindows() { 4653 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 4654 } 4655 4656 /** 4657 * Returns the visibility status for this view. 4658 * 4659 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4660 * @attr ref android.R.styleable#View_visibility 4661 */ 4662 @ViewDebug.ExportedProperty(mapping = { 4663 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 4664 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 4665 @ViewDebug.IntToString(from = GONE, to = "GONE") 4666 }) 4667 public int getVisibility() { 4668 return mViewFlags & VISIBILITY_MASK; 4669 } 4670 4671 /** 4672 * Set the enabled state of this view. 4673 * 4674 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4675 * @attr ref android.R.styleable#View_visibility 4676 */ 4677 @RemotableViewMethod 4678 public void setVisibility(int visibility) { 4679 setFlags(visibility, VISIBILITY_MASK); 4680 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 4681 } 4682 4683 /** 4684 * Returns the enabled status for this view. The interpretation of the 4685 * enabled state varies by subclass. 4686 * 4687 * @return True if this view is enabled, false otherwise. 4688 */ 4689 @ViewDebug.ExportedProperty 4690 public boolean isEnabled() { 4691 return (mViewFlags & ENABLED_MASK) == ENABLED; 4692 } 4693 4694 /** 4695 * Set the enabled state of this view. The interpretation of the enabled 4696 * state varies by subclass. 4697 * 4698 * @param enabled True if this view is enabled, false otherwise. 4699 */ 4700 @RemotableViewMethod 4701 public void setEnabled(boolean enabled) { 4702 if (enabled == isEnabled()) return; 4703 4704 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 4705 4706 /* 4707 * The View most likely has to change its appearance, so refresh 4708 * the drawable state. 4709 */ 4710 refreshDrawableState(); 4711 4712 // Invalidate too, since the default behavior for views is to be 4713 // be drawn at 50% alpha rather than to change the drawable. 4714 invalidate(true); 4715 } 4716 4717 /** 4718 * Set whether this view can receive the focus. 4719 * 4720 * Setting this to false will also ensure that this view is not focusable 4721 * in touch mode. 4722 * 4723 * @param focusable If true, this view can receive the focus. 4724 * 4725 * @see #setFocusableInTouchMode(boolean) 4726 * @attr ref android.R.styleable#View_focusable 4727 */ 4728 public void setFocusable(boolean focusable) { 4729 if (!focusable) { 4730 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 4731 } 4732 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 4733 } 4734 4735 /** 4736 * Set whether this view can receive focus while in touch mode. 4737 * 4738 * Setting this to true will also ensure that this view is focusable. 4739 * 4740 * @param focusableInTouchMode If true, this view can receive the focus while 4741 * in touch mode. 4742 * 4743 * @see #setFocusable(boolean) 4744 * @attr ref android.R.styleable#View_focusableInTouchMode 4745 */ 4746 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 4747 // Focusable in touch mode should always be set before the focusable flag 4748 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 4749 // which, in touch mode, will not successfully request focus on this view 4750 // because the focusable in touch mode flag is not set 4751 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 4752 if (focusableInTouchMode) { 4753 setFlags(FOCUSABLE, FOCUSABLE_MASK); 4754 } 4755 } 4756 4757 /** 4758 * Set whether this view should have sound effects enabled for events such as 4759 * clicking and touching. 4760 * 4761 * <p>You may wish to disable sound effects for a view if you already play sounds, 4762 * for instance, a dial key that plays dtmf tones. 4763 * 4764 * @param soundEffectsEnabled whether sound effects are enabled for this view. 4765 * @see #isSoundEffectsEnabled() 4766 * @see #playSoundEffect(int) 4767 * @attr ref android.R.styleable#View_soundEffectsEnabled 4768 */ 4769 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 4770 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 4771 } 4772 4773 /** 4774 * @return whether this view should have sound effects enabled for events such as 4775 * clicking and touching. 4776 * 4777 * @see #setSoundEffectsEnabled(boolean) 4778 * @see #playSoundEffect(int) 4779 * @attr ref android.R.styleable#View_soundEffectsEnabled 4780 */ 4781 @ViewDebug.ExportedProperty 4782 public boolean isSoundEffectsEnabled() { 4783 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 4784 } 4785 4786 /** 4787 * Set whether this view should have haptic feedback for events such as 4788 * long presses. 4789 * 4790 * <p>You may wish to disable haptic feedback if your view already controls 4791 * its own haptic feedback. 4792 * 4793 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 4794 * @see #isHapticFeedbackEnabled() 4795 * @see #performHapticFeedback(int) 4796 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4797 */ 4798 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 4799 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 4800 } 4801 4802 /** 4803 * @return whether this view should have haptic feedback enabled for events 4804 * long presses. 4805 * 4806 * @see #setHapticFeedbackEnabled(boolean) 4807 * @see #performHapticFeedback(int) 4808 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4809 */ 4810 @ViewDebug.ExportedProperty 4811 public boolean isHapticFeedbackEnabled() { 4812 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 4813 } 4814 4815 /** 4816 * Returns the layout direction for this view. 4817 * 4818 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 4819 * {@link #LAYOUT_DIRECTION_RTL}, 4820 * {@link #LAYOUT_DIRECTION_INHERIT} or 4821 * {@link #LAYOUT_DIRECTION_LOCALE}. 4822 * @attr ref android.R.styleable#View_layoutDirection 4823 * 4824 * @hide 4825 */ 4826 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4827 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 4828 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 4829 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 4830 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 4831 }) 4832 public int getLayoutDirection() { 4833 return mViewFlags & LAYOUT_DIRECTION_MASK; 4834 } 4835 4836 /** 4837 * Set the layout direction for this view. This will propagate a reset of layout direction 4838 * resolution to the view's children and resolve layout direction for this view. 4839 * 4840 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 4841 * {@link #LAYOUT_DIRECTION_RTL}, 4842 * {@link #LAYOUT_DIRECTION_INHERIT} or 4843 * {@link #LAYOUT_DIRECTION_LOCALE}. 4844 * 4845 * @attr ref android.R.styleable#View_layoutDirection 4846 * 4847 * @hide 4848 */ 4849 @RemotableViewMethod 4850 public void setLayoutDirection(int layoutDirection) { 4851 if (getLayoutDirection() != layoutDirection) { 4852 resetResolvedLayoutDirection(); 4853 // Setting the flag will also request a layout. 4854 setFlags(layoutDirection, LAYOUT_DIRECTION_MASK); 4855 } 4856 } 4857 4858 /** 4859 * Returns the resolved layout direction for this view. 4860 * 4861 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 4862 * {@link #LAYOUT_DIRECTION_LTR} id the layout direction is not RTL. 4863 * 4864 * @hide 4865 */ 4866 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4867 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 4868 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 4869 }) 4870 public int getResolvedLayoutDirection() { 4871 resolveLayoutDirectionIfNeeded(); 4872 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 4873 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 4874 } 4875 4876 /** 4877 * <p>Indicates whether or not this view's layout is right-to-left. This is resolved from 4878 * layout attribute and/or the inherited value from the parent.</p> 4879 * 4880 * @return true if the layout is right-to-left. 4881 * 4882 * @hide 4883 */ 4884 @ViewDebug.ExportedProperty(category = "layout") 4885 public boolean isLayoutRtl() { 4886 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 4887 } 4888 4889 /** 4890 * If this view doesn't do any drawing on its own, set this flag to 4891 * allow further optimizations. By default, this flag is not set on 4892 * View, but could be set on some View subclasses such as ViewGroup. 4893 * 4894 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 4895 * you should clear this flag. 4896 * 4897 * @param willNotDraw whether or not this View draw on its own 4898 */ 4899 public void setWillNotDraw(boolean willNotDraw) { 4900 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 4901 } 4902 4903 /** 4904 * Returns whether or not this View draws on its own. 4905 * 4906 * @return true if this view has nothing to draw, false otherwise 4907 */ 4908 @ViewDebug.ExportedProperty(category = "drawing") 4909 public boolean willNotDraw() { 4910 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 4911 } 4912 4913 /** 4914 * When a View's drawing cache is enabled, drawing is redirected to an 4915 * offscreen bitmap. Some views, like an ImageView, must be able to 4916 * bypass this mechanism if they already draw a single bitmap, to avoid 4917 * unnecessary usage of the memory. 4918 * 4919 * @param willNotCacheDrawing true if this view does not cache its 4920 * drawing, false otherwise 4921 */ 4922 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 4923 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 4924 } 4925 4926 /** 4927 * Returns whether or not this View can cache its drawing or not. 4928 * 4929 * @return true if this view does not cache its drawing, false otherwise 4930 */ 4931 @ViewDebug.ExportedProperty(category = "drawing") 4932 public boolean willNotCacheDrawing() { 4933 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 4934 } 4935 4936 /** 4937 * Indicates whether this view reacts to click events or not. 4938 * 4939 * @return true if the view is clickable, false otherwise 4940 * 4941 * @see #setClickable(boolean) 4942 * @attr ref android.R.styleable#View_clickable 4943 */ 4944 @ViewDebug.ExportedProperty 4945 public boolean isClickable() { 4946 return (mViewFlags & CLICKABLE) == CLICKABLE; 4947 } 4948 4949 /** 4950 * Enables or disables click events for this view. When a view 4951 * is clickable it will change its state to "pressed" on every click. 4952 * Subclasses should set the view clickable to visually react to 4953 * user's clicks. 4954 * 4955 * @param clickable true to make the view clickable, false otherwise 4956 * 4957 * @see #isClickable() 4958 * @attr ref android.R.styleable#View_clickable 4959 */ 4960 public void setClickable(boolean clickable) { 4961 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 4962 } 4963 4964 /** 4965 * Indicates whether this view reacts to long click events or not. 4966 * 4967 * @return true if the view is long clickable, false otherwise 4968 * 4969 * @see #setLongClickable(boolean) 4970 * @attr ref android.R.styleable#View_longClickable 4971 */ 4972 public boolean isLongClickable() { 4973 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 4974 } 4975 4976 /** 4977 * Enables or disables long click events for this view. When a view is long 4978 * clickable it reacts to the user holding down the button for a longer 4979 * duration than a tap. This event can either launch the listener or a 4980 * context menu. 4981 * 4982 * @param longClickable true to make the view long clickable, false otherwise 4983 * @see #isLongClickable() 4984 * @attr ref android.R.styleable#View_longClickable 4985 */ 4986 public void setLongClickable(boolean longClickable) { 4987 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 4988 } 4989 4990 /** 4991 * Sets the pressed state for this view. 4992 * 4993 * @see #isClickable() 4994 * @see #setClickable(boolean) 4995 * 4996 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 4997 * the View's internal state from a previously set "pressed" state. 4998 */ 4999 public void setPressed(boolean pressed) { 5000 if (pressed) { 5001 mPrivateFlags |= PRESSED; 5002 } else { 5003 mPrivateFlags &= ~PRESSED; 5004 } 5005 refreshDrawableState(); 5006 dispatchSetPressed(pressed); 5007 } 5008 5009 /** 5010 * Dispatch setPressed to all of this View's children. 5011 * 5012 * @see #setPressed(boolean) 5013 * 5014 * @param pressed The new pressed state 5015 */ 5016 protected void dispatchSetPressed(boolean pressed) { 5017 } 5018 5019 /** 5020 * Indicates whether the view is currently in pressed state. Unless 5021 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5022 * the pressed state. 5023 * 5024 * @see #setPressed(boolean) 5025 * @see #isClickable() 5026 * @see #setClickable(boolean) 5027 * 5028 * @return true if the view is currently pressed, false otherwise 5029 */ 5030 public boolean isPressed() { 5031 return (mPrivateFlags & PRESSED) == PRESSED; 5032 } 5033 5034 /** 5035 * Indicates whether this view will save its state (that is, 5036 * whether its {@link #onSaveInstanceState} method will be called). 5037 * 5038 * @return Returns true if the view state saving is enabled, else false. 5039 * 5040 * @see #setSaveEnabled(boolean) 5041 * @attr ref android.R.styleable#View_saveEnabled 5042 */ 5043 public boolean isSaveEnabled() { 5044 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5045 } 5046 5047 /** 5048 * Controls whether the saving of this view's state is 5049 * enabled (that is, whether its {@link #onSaveInstanceState} method 5050 * will be called). Note that even if freezing is enabled, the 5051 * view still must have an id assigned to it (via {@link #setId(int)}) 5052 * for its state to be saved. This flag can only disable the 5053 * saving of this view; any child views may still have their state saved. 5054 * 5055 * @param enabled Set to false to <em>disable</em> state saving, or true 5056 * (the default) to allow it. 5057 * 5058 * @see #isSaveEnabled() 5059 * @see #setId(int) 5060 * @see #onSaveInstanceState() 5061 * @attr ref android.R.styleable#View_saveEnabled 5062 */ 5063 public void setSaveEnabled(boolean enabled) { 5064 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5065 } 5066 5067 /** 5068 * Gets whether the framework should discard touches when the view's 5069 * window is obscured by another visible window. 5070 * Refer to the {@link View} security documentation for more details. 5071 * 5072 * @return True if touch filtering is enabled. 5073 * 5074 * @see #setFilterTouchesWhenObscured(boolean) 5075 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5076 */ 5077 @ViewDebug.ExportedProperty 5078 public boolean getFilterTouchesWhenObscured() { 5079 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5080 } 5081 5082 /** 5083 * Sets whether the framework should discard touches when the view's 5084 * window is obscured by another visible window. 5085 * Refer to the {@link View} security documentation for more details. 5086 * 5087 * @param enabled True if touch filtering should be enabled. 5088 * 5089 * @see #getFilterTouchesWhenObscured 5090 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5091 */ 5092 public void setFilterTouchesWhenObscured(boolean enabled) { 5093 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5094 FILTER_TOUCHES_WHEN_OBSCURED); 5095 } 5096 5097 /** 5098 * Indicates whether the entire hierarchy under this view will save its 5099 * state when a state saving traversal occurs from its parent. The default 5100 * is true; if false, these views will not be saved unless 5101 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5102 * 5103 * @return Returns true if the view state saving from parent is enabled, else false. 5104 * 5105 * @see #setSaveFromParentEnabled(boolean) 5106 */ 5107 public boolean isSaveFromParentEnabled() { 5108 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5109 } 5110 5111 /** 5112 * Controls whether the entire hierarchy under this view will save its 5113 * state when a state saving traversal occurs from its parent. The default 5114 * is true; if false, these views will not be saved unless 5115 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5116 * 5117 * @param enabled Set to false to <em>disable</em> state saving, or true 5118 * (the default) to allow it. 5119 * 5120 * @see #isSaveFromParentEnabled() 5121 * @see #setId(int) 5122 * @see #onSaveInstanceState() 5123 */ 5124 public void setSaveFromParentEnabled(boolean enabled) { 5125 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5126 } 5127 5128 5129 /** 5130 * Returns whether this View is able to take focus. 5131 * 5132 * @return True if this view can take focus, or false otherwise. 5133 * @attr ref android.R.styleable#View_focusable 5134 */ 5135 @ViewDebug.ExportedProperty(category = "focus") 5136 public final boolean isFocusable() { 5137 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5138 } 5139 5140 /** 5141 * When a view is focusable, it may not want to take focus when in touch mode. 5142 * For example, a button would like focus when the user is navigating via a D-pad 5143 * so that the user can click on it, but once the user starts touching the screen, 5144 * the button shouldn't take focus 5145 * @return Whether the view is focusable in touch mode. 5146 * @attr ref android.R.styleable#View_focusableInTouchMode 5147 */ 5148 @ViewDebug.ExportedProperty 5149 public final boolean isFocusableInTouchMode() { 5150 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5151 } 5152 5153 /** 5154 * Find the nearest view in the specified direction that can take focus. 5155 * This does not actually give focus to that view. 5156 * 5157 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5158 * 5159 * @return The nearest focusable in the specified direction, or null if none 5160 * can be found. 5161 */ 5162 public View focusSearch(int direction) { 5163 if (mParent != null) { 5164 return mParent.focusSearch(this, direction); 5165 } else { 5166 return null; 5167 } 5168 } 5169 5170 /** 5171 * This method is the last chance for the focused view and its ancestors to 5172 * respond to an arrow key. This is called when the focused view did not 5173 * consume the key internally, nor could the view system find a new view in 5174 * the requested direction to give focus to. 5175 * 5176 * @param focused The currently focused view. 5177 * @param direction The direction focus wants to move. One of FOCUS_UP, 5178 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5179 * @return True if the this view consumed this unhandled move. 5180 */ 5181 public boolean dispatchUnhandledMove(View focused, int direction) { 5182 return false; 5183 } 5184 5185 /** 5186 * If a user manually specified the next view id for a particular direction, 5187 * use the root to look up the view. 5188 * @param root The root view of the hierarchy containing this view. 5189 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5190 * or FOCUS_BACKWARD. 5191 * @return The user specified next view, or null if there is none. 5192 */ 5193 View findUserSetNextFocus(View root, int direction) { 5194 switch (direction) { 5195 case FOCUS_LEFT: 5196 if (mNextFocusLeftId == View.NO_ID) return null; 5197 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5198 case FOCUS_RIGHT: 5199 if (mNextFocusRightId == View.NO_ID) return null; 5200 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5201 case FOCUS_UP: 5202 if (mNextFocusUpId == View.NO_ID) return null; 5203 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5204 case FOCUS_DOWN: 5205 if (mNextFocusDownId == View.NO_ID) return null; 5206 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5207 case FOCUS_FORWARD: 5208 if (mNextFocusForwardId == View.NO_ID) return null; 5209 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5210 case FOCUS_BACKWARD: { 5211 final int id = mID; 5212 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5213 @Override 5214 public boolean apply(View t) { 5215 return t.mNextFocusForwardId == id; 5216 } 5217 }); 5218 } 5219 } 5220 return null; 5221 } 5222 5223 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5224 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5225 @Override 5226 public boolean apply(View t) { 5227 return t.mID == childViewId; 5228 } 5229 }); 5230 5231 if (result == null) { 5232 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5233 + "by user for id " + childViewId); 5234 } 5235 return result; 5236 } 5237 5238 /** 5239 * Find and return all focusable views that are descendants of this view, 5240 * possibly including this view if it is focusable itself. 5241 * 5242 * @param direction The direction of the focus 5243 * @return A list of focusable views 5244 */ 5245 public ArrayList<View> getFocusables(int direction) { 5246 ArrayList<View> result = new ArrayList<View>(24); 5247 addFocusables(result, direction); 5248 return result; 5249 } 5250 5251 /** 5252 * Add any focusable views that are descendants of this view (possibly 5253 * including this view if it is focusable itself) to views. If we are in touch mode, 5254 * only add views that are also focusable in touch mode. 5255 * 5256 * @param views Focusable views found so far 5257 * @param direction The direction of the focus 5258 */ 5259 public void addFocusables(ArrayList<View> views, int direction) { 5260 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 5261 } 5262 5263 /** 5264 * Adds any focusable views that are descendants of this view (possibly 5265 * including this view if it is focusable itself) to views. This method 5266 * adds all focusable views regardless if we are in touch mode or 5267 * only views focusable in touch mode if we are in touch mode depending on 5268 * the focusable mode paramater. 5269 * 5270 * @param views Focusable views found so far or null if all we are interested is 5271 * the number of focusables. 5272 * @param direction The direction of the focus. 5273 * @param focusableMode The type of focusables to be added. 5274 * 5275 * @see #FOCUSABLES_ALL 5276 * @see #FOCUSABLES_TOUCH_MODE 5277 */ 5278 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 5279 if (!isFocusable()) { 5280 return; 5281 } 5282 5283 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 5284 isInTouchMode() && !isFocusableInTouchMode()) { 5285 return; 5286 } 5287 5288 if (views != null) { 5289 views.add(this); 5290 } 5291 } 5292 5293 /** 5294 * Finds the Views that contain given text. The containment is case insensitive. 5295 * The search is performed by either the text that the View renders or the content 5296 * description that describes the view for accessibility purposes and the view does 5297 * not render or both. Clients can specify how the search is to be performed via 5298 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 5299 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 5300 * 5301 * @param outViews The output list of matching Views. 5302 * @param searched The text to match against. 5303 * 5304 * @see #FIND_VIEWS_WITH_TEXT 5305 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 5306 * @see #setContentDescription(CharSequence) 5307 */ 5308 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 5309 if (getAccessibilityNodeProvider() != null) { 5310 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 5311 outViews.add(this); 5312 } 5313 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 5314 && !TextUtils.isEmpty(searched) && !TextUtils.isEmpty(mContentDescription)) { 5315 String searchedLowerCase = searched.toString().toLowerCase(); 5316 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 5317 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 5318 outViews.add(this); 5319 } 5320 } 5321 } 5322 5323 /** 5324 * Find and return all touchable views that are descendants of this view, 5325 * possibly including this view if it is touchable itself. 5326 * 5327 * @return A list of touchable views 5328 */ 5329 public ArrayList<View> getTouchables() { 5330 ArrayList<View> result = new ArrayList<View>(); 5331 addTouchables(result); 5332 return result; 5333 } 5334 5335 /** 5336 * Add any touchable views that are descendants of this view (possibly 5337 * including this view if it is touchable itself) to views. 5338 * 5339 * @param views Touchable views found so far 5340 */ 5341 public void addTouchables(ArrayList<View> views) { 5342 final int viewFlags = mViewFlags; 5343 5344 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 5345 && (viewFlags & ENABLED_MASK) == ENABLED) { 5346 views.add(this); 5347 } 5348 } 5349 5350 /** 5351 * Call this to try to give focus to a specific view or to one of its 5352 * descendants. 5353 * 5354 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5355 * false), or if it is focusable and it is not focusable in touch mode 5356 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5357 * 5358 * See also {@link #focusSearch(int)}, which is what you call to say that you 5359 * have focus, and you want your parent to look for the next one. 5360 * 5361 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 5362 * {@link #FOCUS_DOWN} and <code>null</code>. 5363 * 5364 * @return Whether this view or one of its descendants actually took focus. 5365 */ 5366 public final boolean requestFocus() { 5367 return requestFocus(View.FOCUS_DOWN); 5368 } 5369 5370 5371 /** 5372 * Call this to try to give focus to a specific view or to one of its 5373 * descendants and give it a hint about what direction focus is heading. 5374 * 5375 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5376 * false), or if it is focusable and it is not focusable in touch mode 5377 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5378 * 5379 * See also {@link #focusSearch(int)}, which is what you call to say that you 5380 * have focus, and you want your parent to look for the next one. 5381 * 5382 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 5383 * <code>null</code> set for the previously focused rectangle. 5384 * 5385 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5386 * @return Whether this view or one of its descendants actually took focus. 5387 */ 5388 public final boolean requestFocus(int direction) { 5389 return requestFocus(direction, null); 5390 } 5391 5392 /** 5393 * Call this to try to give focus to a specific view or to one of its descendants 5394 * and give it hints about the direction and a specific rectangle that the focus 5395 * is coming from. The rectangle can help give larger views a finer grained hint 5396 * about where focus is coming from, and therefore, where to show selection, or 5397 * forward focus change internally. 5398 * 5399 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5400 * false), or if it is focusable and it is not focusable in touch mode 5401 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5402 * 5403 * A View will not take focus if it is not visible. 5404 * 5405 * A View will not take focus if one of its parents has 5406 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 5407 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 5408 * 5409 * See also {@link #focusSearch(int)}, which is what you call to say that you 5410 * have focus, and you want your parent to look for the next one. 5411 * 5412 * You may wish to override this method if your custom {@link View} has an internal 5413 * {@link View} that it wishes to forward the request to. 5414 * 5415 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5416 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 5417 * to give a finer grained hint about where focus is coming from. May be null 5418 * if there is no hint. 5419 * @return Whether this view or one of its descendants actually took focus. 5420 */ 5421 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 5422 // need to be focusable 5423 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 5424 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5425 return false; 5426 } 5427 5428 // need to be focusable in touch mode if in touch mode 5429 if (isInTouchMode() && 5430 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 5431 return false; 5432 } 5433 5434 // need to not have any parents blocking us 5435 if (hasAncestorThatBlocksDescendantFocus()) { 5436 return false; 5437 } 5438 5439 handleFocusGainInternal(direction, previouslyFocusedRect); 5440 return true; 5441 } 5442 5443 /** Gets the ViewAncestor, or null if not attached. */ 5444 /*package*/ ViewRootImpl getViewRootImpl() { 5445 View root = getRootView(); 5446 return root != null ? (ViewRootImpl)root.getParent() : null; 5447 } 5448 5449 /** 5450 * Call this to try to give focus to a specific view or to one of its descendants. This is a 5451 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 5452 * touch mode to request focus when they are touched. 5453 * 5454 * @return Whether this view or one of its descendants actually took focus. 5455 * 5456 * @see #isInTouchMode() 5457 * 5458 */ 5459 public final boolean requestFocusFromTouch() { 5460 // Leave touch mode if we need to 5461 if (isInTouchMode()) { 5462 ViewRootImpl viewRoot = getViewRootImpl(); 5463 if (viewRoot != null) { 5464 viewRoot.ensureTouchMode(false); 5465 } 5466 } 5467 return requestFocus(View.FOCUS_DOWN); 5468 } 5469 5470 /** 5471 * @return Whether any ancestor of this view blocks descendant focus. 5472 */ 5473 private boolean hasAncestorThatBlocksDescendantFocus() { 5474 ViewParent ancestor = mParent; 5475 while (ancestor instanceof ViewGroup) { 5476 final ViewGroup vgAncestor = (ViewGroup) ancestor; 5477 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 5478 return true; 5479 } else { 5480 ancestor = vgAncestor.getParent(); 5481 } 5482 } 5483 return false; 5484 } 5485 5486 /** 5487 * @hide 5488 */ 5489 public void dispatchStartTemporaryDetach() { 5490 onStartTemporaryDetach(); 5491 } 5492 5493 /** 5494 * This is called when a container is going to temporarily detach a child, with 5495 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 5496 * It will either be followed by {@link #onFinishTemporaryDetach()} or 5497 * {@link #onDetachedFromWindow()} when the container is done. 5498 */ 5499 public void onStartTemporaryDetach() { 5500 removeUnsetPressCallback(); 5501 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 5502 } 5503 5504 /** 5505 * @hide 5506 */ 5507 public void dispatchFinishTemporaryDetach() { 5508 onFinishTemporaryDetach(); 5509 } 5510 5511 /** 5512 * Called after {@link #onStartTemporaryDetach} when the container is done 5513 * changing the view. 5514 */ 5515 public void onFinishTemporaryDetach() { 5516 } 5517 5518 /** 5519 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 5520 * for this view's window. Returns null if the view is not currently attached 5521 * to the window. Normally you will not need to use this directly, but 5522 * just use the standard high-level event callbacks like 5523 * {@link #onKeyDown(int, KeyEvent)}. 5524 */ 5525 public KeyEvent.DispatcherState getKeyDispatcherState() { 5526 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 5527 } 5528 5529 /** 5530 * Dispatch a key event before it is processed by any input method 5531 * associated with the view hierarchy. This can be used to intercept 5532 * key events in special situations before the IME consumes them; a 5533 * typical example would be handling the BACK key to update the application's 5534 * UI instead of allowing the IME to see it and close itself. 5535 * 5536 * @param event The key event to be dispatched. 5537 * @return True if the event was handled, false otherwise. 5538 */ 5539 public boolean dispatchKeyEventPreIme(KeyEvent event) { 5540 return onKeyPreIme(event.getKeyCode(), event); 5541 } 5542 5543 /** 5544 * Dispatch a key event to the next view on the focus path. This path runs 5545 * from the top of the view tree down to the currently focused view. If this 5546 * view has focus, it will dispatch to itself. Otherwise it will dispatch 5547 * the next node down the focus path. This method also fires any key 5548 * listeners. 5549 * 5550 * @param event The key event to be dispatched. 5551 * @return True if the event was handled, false otherwise. 5552 */ 5553 public boolean dispatchKeyEvent(KeyEvent event) { 5554 if (mInputEventConsistencyVerifier != null) { 5555 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 5556 } 5557 5558 // Give any attached key listener a first crack at the event. 5559 //noinspection SimplifiableIfStatement 5560 ListenerInfo li = mListenerInfo; 5561 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5562 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 5563 return true; 5564 } 5565 5566 if (event.dispatch(this, mAttachInfo != null 5567 ? mAttachInfo.mKeyDispatchState : null, this)) { 5568 return true; 5569 } 5570 5571 if (mInputEventConsistencyVerifier != null) { 5572 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5573 } 5574 return false; 5575 } 5576 5577 /** 5578 * Dispatches a key shortcut event. 5579 * 5580 * @param event The key event to be dispatched. 5581 * @return True if the event was handled by the view, false otherwise. 5582 */ 5583 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 5584 return onKeyShortcut(event.getKeyCode(), event); 5585 } 5586 5587 /** 5588 * Pass the touch screen motion event down to the target view, or this 5589 * view if it is the target. 5590 * 5591 * @param event The motion event to be dispatched. 5592 * @return True if the event was handled by the view, false otherwise. 5593 */ 5594 public boolean dispatchTouchEvent(MotionEvent event) { 5595 if (mInputEventConsistencyVerifier != null) { 5596 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 5597 } 5598 5599 if (onFilterTouchEventForSecurity(event)) { 5600 //noinspection SimplifiableIfStatement 5601 ListenerInfo li = mListenerInfo; 5602 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5603 && li.mOnTouchListener.onTouch(this, event)) { 5604 return true; 5605 } 5606 5607 if (onTouchEvent(event)) { 5608 return true; 5609 } 5610 } 5611 5612 if (mInputEventConsistencyVerifier != null) { 5613 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5614 } 5615 return false; 5616 } 5617 5618 /** 5619 * Filter the touch event to apply security policies. 5620 * 5621 * @param event The motion event to be filtered. 5622 * @return True if the event should be dispatched, false if the event should be dropped. 5623 * 5624 * @see #getFilterTouchesWhenObscured 5625 */ 5626 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 5627 //noinspection RedundantIfStatement 5628 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 5629 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 5630 // Window is obscured, drop this touch. 5631 return false; 5632 } 5633 return true; 5634 } 5635 5636 /** 5637 * Pass a trackball motion event down to the focused view. 5638 * 5639 * @param event The motion event to be dispatched. 5640 * @return True if the event was handled by the view, false otherwise. 5641 */ 5642 public boolean dispatchTrackballEvent(MotionEvent event) { 5643 if (mInputEventConsistencyVerifier != null) { 5644 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 5645 } 5646 5647 return onTrackballEvent(event); 5648 } 5649 5650 /** 5651 * Dispatch a generic motion event. 5652 * <p> 5653 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5654 * are delivered to the view under the pointer. All other generic motion events are 5655 * delivered to the focused view. Hover events are handled specially and are delivered 5656 * to {@link #onHoverEvent(MotionEvent)}. 5657 * </p> 5658 * 5659 * @param event The motion event to be dispatched. 5660 * @return True if the event was handled by the view, false otherwise. 5661 */ 5662 public boolean dispatchGenericMotionEvent(MotionEvent event) { 5663 if (mInputEventConsistencyVerifier != null) { 5664 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 5665 } 5666 5667 final int source = event.getSource(); 5668 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5669 final int action = event.getAction(); 5670 if (action == MotionEvent.ACTION_HOVER_ENTER 5671 || action == MotionEvent.ACTION_HOVER_MOVE 5672 || action == MotionEvent.ACTION_HOVER_EXIT) { 5673 if (dispatchHoverEvent(event)) { 5674 return true; 5675 } 5676 } else if (dispatchGenericPointerEvent(event)) { 5677 return true; 5678 } 5679 } else if (dispatchGenericFocusedEvent(event)) { 5680 return true; 5681 } 5682 5683 if (dispatchGenericMotionEventInternal(event)) { 5684 return true; 5685 } 5686 5687 if (mInputEventConsistencyVerifier != null) { 5688 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5689 } 5690 return false; 5691 } 5692 5693 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 5694 //noinspection SimplifiableIfStatement 5695 ListenerInfo li = mListenerInfo; 5696 if (li != null && li.mOnGenericMotionListener != null 5697 && (mViewFlags & ENABLED_MASK) == ENABLED 5698 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 5699 return true; 5700 } 5701 5702 if (onGenericMotionEvent(event)) { 5703 return true; 5704 } 5705 5706 if (mInputEventConsistencyVerifier != null) { 5707 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5708 } 5709 return false; 5710 } 5711 5712 /** 5713 * Dispatch a hover event. 5714 * <p> 5715 * Do not call this method directly. 5716 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5717 * </p> 5718 * 5719 * @param event The motion event to be dispatched. 5720 * @return True if the event was handled by the view, false otherwise. 5721 */ 5722 protected boolean dispatchHoverEvent(MotionEvent event) { 5723 //noinspection SimplifiableIfStatement 5724 ListenerInfo li = mListenerInfo; 5725 if (li != null && li.mOnHoverListener != null 5726 && (mViewFlags & ENABLED_MASK) == ENABLED 5727 && li.mOnHoverListener.onHover(this, event)) { 5728 return true; 5729 } 5730 5731 return onHoverEvent(event); 5732 } 5733 5734 /** 5735 * Returns true if the view has a child to which it has recently sent 5736 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 5737 * it does not have a hovered child, then it must be the innermost hovered view. 5738 * @hide 5739 */ 5740 protected boolean hasHoveredChild() { 5741 return false; 5742 } 5743 5744 /** 5745 * Dispatch a generic motion event to the view under the first pointer. 5746 * <p> 5747 * Do not call this method directly. 5748 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5749 * </p> 5750 * 5751 * @param event The motion event to be dispatched. 5752 * @return True if the event was handled by the view, false otherwise. 5753 */ 5754 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 5755 return false; 5756 } 5757 5758 /** 5759 * Dispatch a generic motion event to the currently focused view. 5760 * <p> 5761 * Do not call this method directly. 5762 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5763 * </p> 5764 * 5765 * @param event The motion event to be dispatched. 5766 * @return True if the event was handled by the view, false otherwise. 5767 */ 5768 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 5769 return false; 5770 } 5771 5772 /** 5773 * Dispatch a pointer event. 5774 * <p> 5775 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 5776 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 5777 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 5778 * and should not be expected to handle other pointing device features. 5779 * </p> 5780 * 5781 * @param event The motion event to be dispatched. 5782 * @return True if the event was handled by the view, false otherwise. 5783 * @hide 5784 */ 5785 public final boolean dispatchPointerEvent(MotionEvent event) { 5786 if (event.isTouchEvent()) { 5787 return dispatchTouchEvent(event); 5788 } else { 5789 return dispatchGenericMotionEvent(event); 5790 } 5791 } 5792 5793 /** 5794 * Called when the window containing this view gains or loses window focus. 5795 * ViewGroups should override to route to their children. 5796 * 5797 * @param hasFocus True if the window containing this view now has focus, 5798 * false otherwise. 5799 */ 5800 public void dispatchWindowFocusChanged(boolean hasFocus) { 5801 onWindowFocusChanged(hasFocus); 5802 } 5803 5804 /** 5805 * Called when the window containing this view gains or loses focus. Note 5806 * that this is separate from view focus: to receive key events, both 5807 * your view and its window must have focus. If a window is displayed 5808 * on top of yours that takes input focus, then your own window will lose 5809 * focus but the view focus will remain unchanged. 5810 * 5811 * @param hasWindowFocus True if the window containing this view now has 5812 * focus, false otherwise. 5813 */ 5814 public void onWindowFocusChanged(boolean hasWindowFocus) { 5815 InputMethodManager imm = InputMethodManager.peekInstance(); 5816 if (!hasWindowFocus) { 5817 if (isPressed()) { 5818 setPressed(false); 5819 } 5820 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5821 imm.focusOut(this); 5822 } 5823 removeLongPressCallback(); 5824 removeTapCallback(); 5825 onFocusLost(); 5826 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5827 imm.focusIn(this); 5828 } 5829 refreshDrawableState(); 5830 } 5831 5832 /** 5833 * Returns true if this view is in a window that currently has window focus. 5834 * Note that this is not the same as the view itself having focus. 5835 * 5836 * @return True if this view is in a window that currently has window focus. 5837 */ 5838 public boolean hasWindowFocus() { 5839 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 5840 } 5841 5842 /** 5843 * Dispatch a view visibility change down the view hierarchy. 5844 * ViewGroups should override to route to their children. 5845 * @param changedView The view whose visibility changed. Could be 'this' or 5846 * an ancestor view. 5847 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5848 * {@link #INVISIBLE} or {@link #GONE}. 5849 */ 5850 protected void dispatchVisibilityChanged(View changedView, int visibility) { 5851 onVisibilityChanged(changedView, visibility); 5852 } 5853 5854 /** 5855 * Called when the visibility of the view or an ancestor of the view is changed. 5856 * @param changedView The view whose visibility changed. Could be 'this' or 5857 * an ancestor view. 5858 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5859 * {@link #INVISIBLE} or {@link #GONE}. 5860 */ 5861 protected void onVisibilityChanged(View changedView, int visibility) { 5862 if (visibility == VISIBLE) { 5863 if (mAttachInfo != null) { 5864 initialAwakenScrollBars(); 5865 } else { 5866 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 5867 } 5868 } 5869 } 5870 5871 /** 5872 * Dispatch a hint about whether this view is displayed. For instance, when 5873 * a View moves out of the screen, it might receives a display hint indicating 5874 * the view is not displayed. Applications should not <em>rely</em> on this hint 5875 * as there is no guarantee that they will receive one. 5876 * 5877 * @param hint A hint about whether or not this view is displayed: 5878 * {@link #VISIBLE} or {@link #INVISIBLE}. 5879 */ 5880 public void dispatchDisplayHint(int hint) { 5881 onDisplayHint(hint); 5882 } 5883 5884 /** 5885 * Gives this view a hint about whether is displayed or not. For instance, when 5886 * a View moves out of the screen, it might receives a display hint indicating 5887 * the view is not displayed. Applications should not <em>rely</em> on this hint 5888 * as there is no guarantee that they will receive one. 5889 * 5890 * @param hint A hint about whether or not this view is displayed: 5891 * {@link #VISIBLE} or {@link #INVISIBLE}. 5892 */ 5893 protected void onDisplayHint(int hint) { 5894 } 5895 5896 /** 5897 * Dispatch a window visibility change down the view hierarchy. 5898 * ViewGroups should override to route to their children. 5899 * 5900 * @param visibility The new visibility of the window. 5901 * 5902 * @see #onWindowVisibilityChanged(int) 5903 */ 5904 public void dispatchWindowVisibilityChanged(int visibility) { 5905 onWindowVisibilityChanged(visibility); 5906 } 5907 5908 /** 5909 * Called when the window containing has change its visibility 5910 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 5911 * that this tells you whether or not your window is being made visible 5912 * to the window manager; this does <em>not</em> tell you whether or not 5913 * your window is obscured by other windows on the screen, even if it 5914 * is itself visible. 5915 * 5916 * @param visibility The new visibility of the window. 5917 */ 5918 protected void onWindowVisibilityChanged(int visibility) { 5919 if (visibility == VISIBLE) { 5920 initialAwakenScrollBars(); 5921 } 5922 } 5923 5924 /** 5925 * Returns the current visibility of the window this view is attached to 5926 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 5927 * 5928 * @return Returns the current visibility of the view's window. 5929 */ 5930 public int getWindowVisibility() { 5931 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 5932 } 5933 5934 /** 5935 * Retrieve the overall visible display size in which the window this view is 5936 * attached to has been positioned in. This takes into account screen 5937 * decorations above the window, for both cases where the window itself 5938 * is being position inside of them or the window is being placed under 5939 * then and covered insets are used for the window to position its content 5940 * inside. In effect, this tells you the available area where content can 5941 * be placed and remain visible to users. 5942 * 5943 * <p>This function requires an IPC back to the window manager to retrieve 5944 * the requested information, so should not be used in performance critical 5945 * code like drawing. 5946 * 5947 * @param outRect Filled in with the visible display frame. If the view 5948 * is not attached to a window, this is simply the raw display size. 5949 */ 5950 public void getWindowVisibleDisplayFrame(Rect outRect) { 5951 if (mAttachInfo != null) { 5952 try { 5953 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 5954 } catch (RemoteException e) { 5955 return; 5956 } 5957 // XXX This is really broken, and probably all needs to be done 5958 // in the window manager, and we need to know more about whether 5959 // we want the area behind or in front of the IME. 5960 final Rect insets = mAttachInfo.mVisibleInsets; 5961 outRect.left += insets.left; 5962 outRect.top += insets.top; 5963 outRect.right -= insets.right; 5964 outRect.bottom -= insets.bottom; 5965 return; 5966 } 5967 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 5968 d.getRectSize(outRect); 5969 } 5970 5971 /** 5972 * Dispatch a notification about a resource configuration change down 5973 * the view hierarchy. 5974 * ViewGroups should override to route to their children. 5975 * 5976 * @param newConfig The new resource configuration. 5977 * 5978 * @see #onConfigurationChanged(android.content.res.Configuration) 5979 */ 5980 public void dispatchConfigurationChanged(Configuration newConfig) { 5981 onConfigurationChanged(newConfig); 5982 } 5983 5984 /** 5985 * Called when the current configuration of the resources being used 5986 * by the application have changed. You can use this to decide when 5987 * to reload resources that can changed based on orientation and other 5988 * configuration characterstics. You only need to use this if you are 5989 * not relying on the normal {@link android.app.Activity} mechanism of 5990 * recreating the activity instance upon a configuration change. 5991 * 5992 * @param newConfig The new resource configuration. 5993 */ 5994 protected void onConfigurationChanged(Configuration newConfig) { 5995 } 5996 5997 /** 5998 * Private function to aggregate all per-view attributes in to the view 5999 * root. 6000 */ 6001 void dispatchCollectViewAttributes(int visibility) { 6002 performCollectViewAttributes(visibility); 6003 } 6004 6005 void performCollectViewAttributes(int visibility) { 6006 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 6007 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 6008 mAttachInfo.mKeepScreenOn = true; 6009 } 6010 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 6011 ListenerInfo li = mListenerInfo; 6012 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 6013 mAttachInfo.mHasSystemUiListeners = true; 6014 } 6015 } 6016 } 6017 6018 void needGlobalAttributesUpdate(boolean force) { 6019 final AttachInfo ai = mAttachInfo; 6020 if (ai != null) { 6021 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 6022 || ai.mHasSystemUiListeners) { 6023 ai.mRecomputeGlobalAttributes = true; 6024 } 6025 } 6026 } 6027 6028 /** 6029 * Returns whether the device is currently in touch mode. Touch mode is entered 6030 * once the user begins interacting with the device by touch, and affects various 6031 * things like whether focus is always visible to the user. 6032 * 6033 * @return Whether the device is in touch mode. 6034 */ 6035 @ViewDebug.ExportedProperty 6036 public boolean isInTouchMode() { 6037 if (mAttachInfo != null) { 6038 return mAttachInfo.mInTouchMode; 6039 } else { 6040 return ViewRootImpl.isInTouchMode(); 6041 } 6042 } 6043 6044 /** 6045 * Returns the context the view is running in, through which it can 6046 * access the current theme, resources, etc. 6047 * 6048 * @return The view's Context. 6049 */ 6050 @ViewDebug.CapturedViewProperty 6051 public final Context getContext() { 6052 return mContext; 6053 } 6054 6055 /** 6056 * Handle a key event before it is processed by any input method 6057 * associated with the view hierarchy. This can be used to intercept 6058 * key events in special situations before the IME consumes them; a 6059 * typical example would be handling the BACK key to update the application's 6060 * UI instead of allowing the IME to see it and close itself. 6061 * 6062 * @param keyCode The value in event.getKeyCode(). 6063 * @param event Description of the key event. 6064 * @return If you handled the event, return true. If you want to allow the 6065 * event to be handled by the next receiver, return false. 6066 */ 6067 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 6068 return false; 6069 } 6070 6071 /** 6072 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 6073 * KeyEvent.Callback.onKeyDown()}: perform press of the view 6074 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 6075 * is released, if the view is enabled and clickable. 6076 * 6077 * @param keyCode A key code that represents the button pressed, from 6078 * {@link android.view.KeyEvent}. 6079 * @param event The KeyEvent object that defines the button action. 6080 */ 6081 public boolean onKeyDown(int keyCode, KeyEvent event) { 6082 boolean result = false; 6083 6084 switch (keyCode) { 6085 case KeyEvent.KEYCODE_DPAD_CENTER: 6086 case KeyEvent.KEYCODE_ENTER: { 6087 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 6088 return true; 6089 } 6090 // Long clickable items don't necessarily have to be clickable 6091 if (((mViewFlags & CLICKABLE) == CLICKABLE || 6092 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 6093 (event.getRepeatCount() == 0)) { 6094 setPressed(true); 6095 checkForLongClick(0); 6096 return true; 6097 } 6098 break; 6099 } 6100 } 6101 return result; 6102 } 6103 6104 /** 6105 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 6106 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 6107 * the event). 6108 */ 6109 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 6110 return false; 6111 } 6112 6113 /** 6114 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 6115 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 6116 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 6117 * {@link KeyEvent#KEYCODE_ENTER} is released. 6118 * 6119 * @param keyCode A key code that represents the button pressed, from 6120 * {@link android.view.KeyEvent}. 6121 * @param event The KeyEvent object that defines the button action. 6122 */ 6123 public boolean onKeyUp(int keyCode, KeyEvent event) { 6124 boolean result = false; 6125 6126 switch (keyCode) { 6127 case KeyEvent.KEYCODE_DPAD_CENTER: 6128 case KeyEvent.KEYCODE_ENTER: { 6129 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 6130 return true; 6131 } 6132 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 6133 setPressed(false); 6134 6135 if (!mHasPerformedLongPress) { 6136 // This is a tap, so remove the longpress check 6137 removeLongPressCallback(); 6138 6139 result = performClick(); 6140 } 6141 } 6142 break; 6143 } 6144 } 6145 return result; 6146 } 6147 6148 /** 6149 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 6150 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 6151 * the event). 6152 * 6153 * @param keyCode A key code that represents the button pressed, from 6154 * {@link android.view.KeyEvent}. 6155 * @param repeatCount The number of times the action was made. 6156 * @param event The KeyEvent object that defines the button action. 6157 */ 6158 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 6159 return false; 6160 } 6161 6162 /** 6163 * Called on the focused view when a key shortcut event is not handled. 6164 * Override this method to implement local key shortcuts for the View. 6165 * Key shortcuts can also be implemented by setting the 6166 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 6167 * 6168 * @param keyCode The value in event.getKeyCode(). 6169 * @param event Description of the key event. 6170 * @return If you handled the event, return true. If you want to allow the 6171 * event to be handled by the next receiver, return false. 6172 */ 6173 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 6174 return false; 6175 } 6176 6177 /** 6178 * Check whether the called view is a text editor, in which case it 6179 * would make sense to automatically display a soft input window for 6180 * it. Subclasses should override this if they implement 6181 * {@link #onCreateInputConnection(EditorInfo)} to return true if 6182 * a call on that method would return a non-null InputConnection, and 6183 * they are really a first-class editor that the user would normally 6184 * start typing on when the go into a window containing your view. 6185 * 6186 * <p>The default implementation always returns false. This does 6187 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 6188 * will not be called or the user can not otherwise perform edits on your 6189 * view; it is just a hint to the system that this is not the primary 6190 * purpose of this view. 6191 * 6192 * @return Returns true if this view is a text editor, else false. 6193 */ 6194 public boolean onCheckIsTextEditor() { 6195 return false; 6196 } 6197 6198 /** 6199 * Create a new InputConnection for an InputMethod to interact 6200 * with the view. The default implementation returns null, since it doesn't 6201 * support input methods. You can override this to implement such support. 6202 * This is only needed for views that take focus and text input. 6203 * 6204 * <p>When implementing this, you probably also want to implement 6205 * {@link #onCheckIsTextEditor()} to indicate you will return a 6206 * non-null InputConnection. 6207 * 6208 * @param outAttrs Fill in with attribute information about the connection. 6209 */ 6210 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 6211 return null; 6212 } 6213 6214 /** 6215 * Called by the {@link android.view.inputmethod.InputMethodManager} 6216 * when a view who is not the current 6217 * input connection target is trying to make a call on the manager. The 6218 * default implementation returns false; you can override this to return 6219 * true for certain views if you are performing InputConnection proxying 6220 * to them. 6221 * @param view The View that is making the InputMethodManager call. 6222 * @return Return true to allow the call, false to reject. 6223 */ 6224 public boolean checkInputConnectionProxy(View view) { 6225 return false; 6226 } 6227 6228 /** 6229 * Show the context menu for this view. It is not safe to hold on to the 6230 * menu after returning from this method. 6231 * 6232 * You should normally not overload this method. Overload 6233 * {@link #onCreateContextMenu(ContextMenu)} or define an 6234 * {@link OnCreateContextMenuListener} to add items to the context menu. 6235 * 6236 * @param menu The context menu to populate 6237 */ 6238 public void createContextMenu(ContextMenu menu) { 6239 ContextMenuInfo menuInfo = getContextMenuInfo(); 6240 6241 // Sets the current menu info so all items added to menu will have 6242 // my extra info set. 6243 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 6244 6245 onCreateContextMenu(menu); 6246 ListenerInfo li = mListenerInfo; 6247 if (li != null && li.mOnCreateContextMenuListener != null) { 6248 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 6249 } 6250 6251 // Clear the extra information so subsequent items that aren't mine don't 6252 // have my extra info. 6253 ((MenuBuilder)menu).setCurrentMenuInfo(null); 6254 6255 if (mParent != null) { 6256 mParent.createContextMenu(menu); 6257 } 6258 } 6259 6260 /** 6261 * Views should implement this if they have extra information to associate 6262 * with the context menu. The return result is supplied as a parameter to 6263 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 6264 * callback. 6265 * 6266 * @return Extra information about the item for which the context menu 6267 * should be shown. This information will vary across different 6268 * subclasses of View. 6269 */ 6270 protected ContextMenuInfo getContextMenuInfo() { 6271 return null; 6272 } 6273 6274 /** 6275 * Views should implement this if the view itself is going to add items to 6276 * the context menu. 6277 * 6278 * @param menu the context menu to populate 6279 */ 6280 protected void onCreateContextMenu(ContextMenu menu) { 6281 } 6282 6283 /** 6284 * Implement this method to handle trackball motion events. The 6285 * <em>relative</em> movement of the trackball since the last event 6286 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 6287 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 6288 * that a movement of 1 corresponds to the user pressing one DPAD key (so 6289 * they will often be fractional values, representing the more fine-grained 6290 * movement information available from a trackball). 6291 * 6292 * @param event The motion event. 6293 * @return True if the event was handled, false otherwise. 6294 */ 6295 public boolean onTrackballEvent(MotionEvent event) { 6296 return false; 6297 } 6298 6299 /** 6300 * Implement this method to handle generic motion events. 6301 * <p> 6302 * Generic motion events describe joystick movements, mouse hovers, track pad 6303 * touches, scroll wheel movements and other input events. The 6304 * {@link MotionEvent#getSource() source} of the motion event specifies 6305 * the class of input that was received. Implementations of this method 6306 * must examine the bits in the source before processing the event. 6307 * The following code example shows how this is done. 6308 * </p><p> 6309 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6310 * are delivered to the view under the pointer. All other generic motion events are 6311 * delivered to the focused view. 6312 * </p> 6313 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 6314 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 6315 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 6316 * // process the joystick movement... 6317 * return true; 6318 * } 6319 * } 6320 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6321 * switch (event.getAction()) { 6322 * case MotionEvent.ACTION_HOVER_MOVE: 6323 * // process the mouse hover movement... 6324 * return true; 6325 * case MotionEvent.ACTION_SCROLL: 6326 * // process the scroll wheel movement... 6327 * return true; 6328 * } 6329 * } 6330 * return super.onGenericMotionEvent(event); 6331 * }</pre> 6332 * 6333 * @param event The generic motion event being processed. 6334 * @return True if the event was handled, false otherwise. 6335 */ 6336 public boolean onGenericMotionEvent(MotionEvent event) { 6337 return false; 6338 } 6339 6340 /** 6341 * Implement this method to handle hover events. 6342 * <p> 6343 * This method is called whenever a pointer is hovering into, over, or out of the 6344 * bounds of a view and the view is not currently being touched. 6345 * Hover events are represented as pointer events with action 6346 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 6347 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 6348 * </p> 6349 * <ul> 6350 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 6351 * when the pointer enters the bounds of the view.</li> 6352 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 6353 * when the pointer has already entered the bounds of the view and has moved.</li> 6354 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 6355 * when the pointer has exited the bounds of the view or when the pointer is 6356 * about to go down due to a button click, tap, or similar user action that 6357 * causes the view to be touched.</li> 6358 * </ul> 6359 * <p> 6360 * The view should implement this method to return true to indicate that it is 6361 * handling the hover event, such as by changing its drawable state. 6362 * </p><p> 6363 * The default implementation calls {@link #setHovered} to update the hovered state 6364 * of the view when a hover enter or hover exit event is received, if the view 6365 * is enabled and is clickable. The default implementation also sends hover 6366 * accessibility events. 6367 * </p> 6368 * 6369 * @param event The motion event that describes the hover. 6370 * @return True if the view handled the hover event. 6371 * 6372 * @see #isHovered 6373 * @see #setHovered 6374 * @see #onHoverChanged 6375 */ 6376 public boolean onHoverEvent(MotionEvent event) { 6377 // The root view may receive hover (or touch) events that are outside the bounds of 6378 // the window. This code ensures that we only send accessibility events for 6379 // hovers that are actually within the bounds of the root view. 6380 final int action = event.getAction(); 6381 if (!mSendingHoverAccessibilityEvents) { 6382 if ((action == MotionEvent.ACTION_HOVER_ENTER 6383 || action == MotionEvent.ACTION_HOVER_MOVE) 6384 && !hasHoveredChild() 6385 && pointInView(event.getX(), event.getY())) { 6386 mSendingHoverAccessibilityEvents = true; 6387 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 6388 } 6389 } else { 6390 if (action == MotionEvent.ACTION_HOVER_EXIT 6391 || (action == MotionEvent.ACTION_HOVER_MOVE 6392 && !pointInView(event.getX(), event.getY()))) { 6393 mSendingHoverAccessibilityEvents = false; 6394 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 6395 } 6396 } 6397 6398 if (isHoverable()) { 6399 switch (action) { 6400 case MotionEvent.ACTION_HOVER_ENTER: 6401 setHovered(true); 6402 break; 6403 case MotionEvent.ACTION_HOVER_EXIT: 6404 setHovered(false); 6405 break; 6406 } 6407 6408 // Dispatch the event to onGenericMotionEvent before returning true. 6409 // This is to provide compatibility with existing applications that 6410 // handled HOVER_MOVE events in onGenericMotionEvent and that would 6411 // break because of the new default handling for hoverable views 6412 // in onHoverEvent. 6413 // Note that onGenericMotionEvent will be called by default when 6414 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 6415 dispatchGenericMotionEventInternal(event); 6416 return true; 6417 } 6418 return false; 6419 } 6420 6421 /** 6422 * Returns true if the view should handle {@link #onHoverEvent} 6423 * by calling {@link #setHovered} to change its hovered state. 6424 * 6425 * @return True if the view is hoverable. 6426 */ 6427 private boolean isHoverable() { 6428 final int viewFlags = mViewFlags; 6429 //noinspection SimplifiableIfStatement 6430 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6431 return false; 6432 } 6433 6434 return (viewFlags & CLICKABLE) == CLICKABLE 6435 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6436 } 6437 6438 /** 6439 * Returns true if the view is currently hovered. 6440 * 6441 * @return True if the view is currently hovered. 6442 * 6443 * @see #setHovered 6444 * @see #onHoverChanged 6445 */ 6446 @ViewDebug.ExportedProperty 6447 public boolean isHovered() { 6448 return (mPrivateFlags & HOVERED) != 0; 6449 } 6450 6451 /** 6452 * Sets whether the view is currently hovered. 6453 * <p> 6454 * Calling this method also changes the drawable state of the view. This 6455 * enables the view to react to hover by using different drawable resources 6456 * to change its appearance. 6457 * </p><p> 6458 * The {@link #onHoverChanged} method is called when the hovered state changes. 6459 * </p> 6460 * 6461 * @param hovered True if the view is hovered. 6462 * 6463 * @see #isHovered 6464 * @see #onHoverChanged 6465 */ 6466 public void setHovered(boolean hovered) { 6467 if (hovered) { 6468 if ((mPrivateFlags & HOVERED) == 0) { 6469 mPrivateFlags |= HOVERED; 6470 refreshDrawableState(); 6471 onHoverChanged(true); 6472 } 6473 } else { 6474 if ((mPrivateFlags & HOVERED) != 0) { 6475 mPrivateFlags &= ~HOVERED; 6476 refreshDrawableState(); 6477 onHoverChanged(false); 6478 } 6479 } 6480 } 6481 6482 /** 6483 * Implement this method to handle hover state changes. 6484 * <p> 6485 * This method is called whenever the hover state changes as a result of a 6486 * call to {@link #setHovered}. 6487 * </p> 6488 * 6489 * @param hovered The current hover state, as returned by {@link #isHovered}. 6490 * 6491 * @see #isHovered 6492 * @see #setHovered 6493 */ 6494 public void onHoverChanged(boolean hovered) { 6495 } 6496 6497 /** 6498 * Implement this method to handle touch screen motion events. 6499 * 6500 * @param event The motion event. 6501 * @return True if the event was handled, false otherwise. 6502 */ 6503 public boolean onTouchEvent(MotionEvent event) { 6504 final int viewFlags = mViewFlags; 6505 6506 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6507 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 6508 mPrivateFlags &= ~PRESSED; 6509 refreshDrawableState(); 6510 } 6511 // A disabled view that is clickable still consumes the touch 6512 // events, it just doesn't respond to them. 6513 return (((viewFlags & CLICKABLE) == CLICKABLE || 6514 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 6515 } 6516 6517 if (mTouchDelegate != null) { 6518 if (mTouchDelegate.onTouchEvent(event)) { 6519 return true; 6520 } 6521 } 6522 6523 if (((viewFlags & CLICKABLE) == CLICKABLE || 6524 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 6525 switch (event.getAction()) { 6526 case MotionEvent.ACTION_UP: 6527 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 6528 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 6529 // take focus if we don't have it already and we should in 6530 // touch mode. 6531 boolean focusTaken = false; 6532 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 6533 focusTaken = requestFocus(); 6534 } 6535 6536 if (prepressed) { 6537 // The button is being released before we actually 6538 // showed it as pressed. Make it show the pressed 6539 // state now (before scheduling the click) to ensure 6540 // the user sees it. 6541 mPrivateFlags |= PRESSED; 6542 refreshDrawableState(); 6543 } 6544 6545 if (!mHasPerformedLongPress) { 6546 // This is a tap, so remove the longpress check 6547 removeLongPressCallback(); 6548 6549 // Only perform take click actions if we were in the pressed state 6550 if (!focusTaken) { 6551 // Use a Runnable and post this rather than calling 6552 // performClick directly. This lets other visual state 6553 // of the view update before click actions start. 6554 if (mPerformClick == null) { 6555 mPerformClick = new PerformClick(); 6556 } 6557 if (!post(mPerformClick)) { 6558 performClick(); 6559 } 6560 } 6561 } 6562 6563 if (mUnsetPressedState == null) { 6564 mUnsetPressedState = new UnsetPressedState(); 6565 } 6566 6567 if (prepressed) { 6568 postDelayed(mUnsetPressedState, 6569 ViewConfiguration.getPressedStateDuration()); 6570 } else if (!post(mUnsetPressedState)) { 6571 // If the post failed, unpress right now 6572 mUnsetPressedState.run(); 6573 } 6574 removeTapCallback(); 6575 } 6576 break; 6577 6578 case MotionEvent.ACTION_DOWN: 6579 mHasPerformedLongPress = false; 6580 6581 if (performButtonActionOnTouchDown(event)) { 6582 break; 6583 } 6584 6585 // Walk up the hierarchy to determine if we're inside a scrolling container. 6586 boolean isInScrollingContainer = isInScrollingContainer(); 6587 6588 // For views inside a scrolling container, delay the pressed feedback for 6589 // a short period in case this is a scroll. 6590 if (isInScrollingContainer) { 6591 mPrivateFlags |= PREPRESSED; 6592 if (mPendingCheckForTap == null) { 6593 mPendingCheckForTap = new CheckForTap(); 6594 } 6595 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 6596 } else { 6597 // Not inside a scrolling container, so show the feedback right away 6598 mPrivateFlags |= PRESSED; 6599 refreshDrawableState(); 6600 checkForLongClick(0); 6601 } 6602 break; 6603 6604 case MotionEvent.ACTION_CANCEL: 6605 mPrivateFlags &= ~PRESSED; 6606 refreshDrawableState(); 6607 removeTapCallback(); 6608 break; 6609 6610 case MotionEvent.ACTION_MOVE: 6611 final int x = (int) event.getX(); 6612 final int y = (int) event.getY(); 6613 6614 // Be lenient about moving outside of buttons 6615 if (!pointInView(x, y, mTouchSlop)) { 6616 // Outside button 6617 removeTapCallback(); 6618 if ((mPrivateFlags & PRESSED) != 0) { 6619 // Remove any future long press/tap checks 6620 removeLongPressCallback(); 6621 6622 // Need to switch from pressed to not pressed 6623 mPrivateFlags &= ~PRESSED; 6624 refreshDrawableState(); 6625 } 6626 } 6627 break; 6628 } 6629 return true; 6630 } 6631 6632 return false; 6633 } 6634 6635 /** 6636 * @hide 6637 */ 6638 public boolean isInScrollingContainer() { 6639 ViewParent p = getParent(); 6640 while (p != null && p instanceof ViewGroup) { 6641 if (((ViewGroup) p).shouldDelayChildPressedState()) { 6642 return true; 6643 } 6644 p = p.getParent(); 6645 } 6646 return false; 6647 } 6648 6649 /** 6650 * Remove the longpress detection timer. 6651 */ 6652 private void removeLongPressCallback() { 6653 if (mPendingCheckForLongPress != null) { 6654 removeCallbacks(mPendingCheckForLongPress); 6655 } 6656 } 6657 6658 /** 6659 * Remove the pending click action 6660 */ 6661 private void removePerformClickCallback() { 6662 if (mPerformClick != null) { 6663 removeCallbacks(mPerformClick); 6664 } 6665 } 6666 6667 /** 6668 * Remove the prepress detection timer. 6669 */ 6670 private void removeUnsetPressCallback() { 6671 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 6672 setPressed(false); 6673 removeCallbacks(mUnsetPressedState); 6674 } 6675 } 6676 6677 /** 6678 * Remove the tap detection timer. 6679 */ 6680 private void removeTapCallback() { 6681 if (mPendingCheckForTap != null) { 6682 mPrivateFlags &= ~PREPRESSED; 6683 removeCallbacks(mPendingCheckForTap); 6684 } 6685 } 6686 6687 /** 6688 * Cancels a pending long press. Your subclass can use this if you 6689 * want the context menu to come up if the user presses and holds 6690 * at the same place, but you don't want it to come up if they press 6691 * and then move around enough to cause scrolling. 6692 */ 6693 public void cancelLongPress() { 6694 removeLongPressCallback(); 6695 6696 /* 6697 * The prepressed state handled by the tap callback is a display 6698 * construct, but the tap callback will post a long press callback 6699 * less its own timeout. Remove it here. 6700 */ 6701 removeTapCallback(); 6702 } 6703 6704 /** 6705 * Remove the pending callback for sending a 6706 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 6707 */ 6708 private void removeSendViewScrolledAccessibilityEventCallback() { 6709 if (mSendViewScrolledAccessibilityEvent != null) { 6710 removeCallbacks(mSendViewScrolledAccessibilityEvent); 6711 } 6712 } 6713 6714 /** 6715 * Sets the TouchDelegate for this View. 6716 */ 6717 public void setTouchDelegate(TouchDelegate delegate) { 6718 mTouchDelegate = delegate; 6719 } 6720 6721 /** 6722 * Gets the TouchDelegate for this View. 6723 */ 6724 public TouchDelegate getTouchDelegate() { 6725 return mTouchDelegate; 6726 } 6727 6728 /** 6729 * Set flags controlling behavior of this view. 6730 * 6731 * @param flags Constant indicating the value which should be set 6732 * @param mask Constant indicating the bit range that should be changed 6733 */ 6734 void setFlags(int flags, int mask) { 6735 int old = mViewFlags; 6736 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 6737 6738 int changed = mViewFlags ^ old; 6739 if (changed == 0) { 6740 return; 6741 } 6742 int privateFlags = mPrivateFlags; 6743 6744 /* Check if the FOCUSABLE bit has changed */ 6745 if (((changed & FOCUSABLE_MASK) != 0) && 6746 ((privateFlags & HAS_BOUNDS) !=0)) { 6747 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 6748 && ((privateFlags & FOCUSED) != 0)) { 6749 /* Give up focus if we are no longer focusable */ 6750 clearFocus(); 6751 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 6752 && ((privateFlags & FOCUSED) == 0)) { 6753 /* 6754 * Tell the view system that we are now available to take focus 6755 * if no one else already has it. 6756 */ 6757 if (mParent != null) mParent.focusableViewAvailable(this); 6758 } 6759 } 6760 6761 if ((flags & VISIBILITY_MASK) == VISIBLE) { 6762 if ((changed & VISIBILITY_MASK) != 0) { 6763 /* 6764 * If this view is becoming visible, invalidate it in case it changed while 6765 * it was not visible. Marking it drawn ensures that the invalidation will 6766 * go through. 6767 */ 6768 mPrivateFlags |= DRAWN; 6769 invalidate(true); 6770 6771 needGlobalAttributesUpdate(true); 6772 6773 // a view becoming visible is worth notifying the parent 6774 // about in case nothing has focus. even if this specific view 6775 // isn't focusable, it may contain something that is, so let 6776 // the root view try to give this focus if nothing else does. 6777 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 6778 mParent.focusableViewAvailable(this); 6779 } 6780 } 6781 } 6782 6783 /* Check if the GONE bit has changed */ 6784 if ((changed & GONE) != 0) { 6785 needGlobalAttributesUpdate(false); 6786 requestLayout(); 6787 6788 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 6789 if (hasFocus()) clearFocus(); 6790 destroyDrawingCache(); 6791 if (mParent instanceof View) { 6792 // GONE views noop invalidation, so invalidate the parent 6793 ((View) mParent).invalidate(true); 6794 } 6795 // Mark the view drawn to ensure that it gets invalidated properly the next 6796 // time it is visible and gets invalidated 6797 mPrivateFlags |= DRAWN; 6798 } 6799 if (mAttachInfo != null) { 6800 mAttachInfo.mViewVisibilityChanged = true; 6801 } 6802 } 6803 6804 /* Check if the VISIBLE bit has changed */ 6805 if ((changed & INVISIBLE) != 0) { 6806 needGlobalAttributesUpdate(false); 6807 /* 6808 * If this view is becoming invisible, set the DRAWN flag so that 6809 * the next invalidate() will not be skipped. 6810 */ 6811 mPrivateFlags |= DRAWN; 6812 6813 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 6814 // root view becoming invisible shouldn't clear focus 6815 if (getRootView() != this) { 6816 clearFocus(); 6817 } 6818 } 6819 if (mAttachInfo != null) { 6820 mAttachInfo.mViewVisibilityChanged = true; 6821 } 6822 } 6823 6824 if ((changed & VISIBILITY_MASK) != 0) { 6825 if (mParent instanceof ViewGroup) { 6826 ((ViewGroup) mParent).onChildVisibilityChanged(this, 6827 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 6828 ((View) mParent).invalidate(true); 6829 } else if (mParent != null) { 6830 mParent.invalidateChild(this, null); 6831 } 6832 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6833 } 6834 6835 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 6836 destroyDrawingCache(); 6837 } 6838 6839 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 6840 destroyDrawingCache(); 6841 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6842 invalidateParentCaches(); 6843 } 6844 6845 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 6846 destroyDrawingCache(); 6847 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6848 } 6849 6850 if ((changed & DRAW_MASK) != 0) { 6851 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 6852 if (mBGDrawable != null) { 6853 mPrivateFlags &= ~SKIP_DRAW; 6854 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 6855 } else { 6856 mPrivateFlags |= SKIP_DRAW; 6857 } 6858 } else { 6859 mPrivateFlags &= ~SKIP_DRAW; 6860 } 6861 requestLayout(); 6862 invalidate(true); 6863 } 6864 6865 if ((changed & KEEP_SCREEN_ON) != 0) { 6866 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 6867 mParent.recomputeViewAttributes(this); 6868 } 6869 } 6870 6871 if ((changed & LAYOUT_DIRECTION_MASK) != 0) { 6872 requestLayout(); 6873 } 6874 } 6875 6876 /** 6877 * Change the view's z order in the tree, so it's on top of other sibling 6878 * views 6879 */ 6880 public void bringToFront() { 6881 if (mParent != null) { 6882 mParent.bringChildToFront(this); 6883 } 6884 } 6885 6886 /** 6887 * This is called in response to an internal scroll in this view (i.e., the 6888 * view scrolled its own contents). This is typically as a result of 6889 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 6890 * called. 6891 * 6892 * @param l Current horizontal scroll origin. 6893 * @param t Current vertical scroll origin. 6894 * @param oldl Previous horizontal scroll origin. 6895 * @param oldt Previous vertical scroll origin. 6896 */ 6897 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 6898 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 6899 postSendViewScrolledAccessibilityEventCallback(); 6900 } 6901 6902 mBackgroundSizeChanged = true; 6903 6904 final AttachInfo ai = mAttachInfo; 6905 if (ai != null) { 6906 ai.mViewScrollChanged = true; 6907 } 6908 } 6909 6910 /** 6911 * Interface definition for a callback to be invoked when the layout bounds of a view 6912 * changes due to layout processing. 6913 */ 6914 public interface OnLayoutChangeListener { 6915 /** 6916 * Called when the focus state of a view has changed. 6917 * 6918 * @param v The view whose state has changed. 6919 * @param left The new value of the view's left property. 6920 * @param top The new value of the view's top property. 6921 * @param right The new value of the view's right property. 6922 * @param bottom The new value of the view's bottom property. 6923 * @param oldLeft The previous value of the view's left property. 6924 * @param oldTop The previous value of the view's top property. 6925 * @param oldRight The previous value of the view's right property. 6926 * @param oldBottom The previous value of the view's bottom property. 6927 */ 6928 void onLayoutChange(View v, int left, int top, int right, int bottom, 6929 int oldLeft, int oldTop, int oldRight, int oldBottom); 6930 } 6931 6932 /** 6933 * This is called during layout when the size of this view has changed. If 6934 * you were just added to the view hierarchy, you're called with the old 6935 * values of 0. 6936 * 6937 * @param w Current width of this view. 6938 * @param h Current height of this view. 6939 * @param oldw Old width of this view. 6940 * @param oldh Old height of this view. 6941 */ 6942 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 6943 } 6944 6945 /** 6946 * Called by draw to draw the child views. This may be overridden 6947 * by derived classes to gain control just before its children are drawn 6948 * (but after its own view has been drawn). 6949 * @param canvas the canvas on which to draw the view 6950 */ 6951 protected void dispatchDraw(Canvas canvas) { 6952 } 6953 6954 /** 6955 * Gets the parent of this view. Note that the parent is a 6956 * ViewParent and not necessarily a View. 6957 * 6958 * @return Parent of this view. 6959 */ 6960 public final ViewParent getParent() { 6961 return mParent; 6962 } 6963 6964 /** 6965 * Set the horizontal scrolled position of your view. This will cause a call to 6966 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6967 * invalidated. 6968 * @param value the x position to scroll to 6969 */ 6970 public void setScrollX(int value) { 6971 scrollTo(value, mScrollY); 6972 } 6973 6974 /** 6975 * Set the vertical scrolled position of your view. This will cause a call to 6976 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6977 * invalidated. 6978 * @param value the y position to scroll to 6979 */ 6980 public void setScrollY(int value) { 6981 scrollTo(mScrollX, value); 6982 } 6983 6984 /** 6985 * Return the scrolled left position of this view. This is the left edge of 6986 * the displayed part of your view. You do not need to draw any pixels 6987 * farther left, since those are outside of the frame of your view on 6988 * screen. 6989 * 6990 * @return The left edge of the displayed part of your view, in pixels. 6991 */ 6992 public final int getScrollX() { 6993 return mScrollX; 6994 } 6995 6996 /** 6997 * Return the scrolled top position of this view. This is the top edge of 6998 * the displayed part of your view. You do not need to draw any pixels above 6999 * it, since those are outside of the frame of your view on screen. 7000 * 7001 * @return The top edge of the displayed part of your view, in pixels. 7002 */ 7003 public final int getScrollY() { 7004 return mScrollY; 7005 } 7006 7007 /** 7008 * Return the width of the your view. 7009 * 7010 * @return The width of your view, in pixels. 7011 */ 7012 @ViewDebug.ExportedProperty(category = "layout") 7013 public final int getWidth() { 7014 return mRight - mLeft; 7015 } 7016 7017 /** 7018 * Return the height of your view. 7019 * 7020 * @return The height of your view, in pixels. 7021 */ 7022 @ViewDebug.ExportedProperty(category = "layout") 7023 public final int getHeight() { 7024 return mBottom - mTop; 7025 } 7026 7027 /** 7028 * Return the visible drawing bounds of your view. Fills in the output 7029 * rectangle with the values from getScrollX(), getScrollY(), 7030 * getWidth(), and getHeight(). 7031 * 7032 * @param outRect The (scrolled) drawing bounds of the view. 7033 */ 7034 public void getDrawingRect(Rect outRect) { 7035 outRect.left = mScrollX; 7036 outRect.top = mScrollY; 7037 outRect.right = mScrollX + (mRight - mLeft); 7038 outRect.bottom = mScrollY + (mBottom - mTop); 7039 } 7040 7041 /** 7042 * Like {@link #getMeasuredWidthAndState()}, but only returns the 7043 * raw width component (that is the result is masked by 7044 * {@link #MEASURED_SIZE_MASK}). 7045 * 7046 * @return The raw measured width of this view. 7047 */ 7048 public final int getMeasuredWidth() { 7049 return mMeasuredWidth & MEASURED_SIZE_MASK; 7050 } 7051 7052 /** 7053 * Return the full width measurement information for this view as computed 7054 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 7055 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 7056 * This should be used during measurement and layout calculations only. Use 7057 * {@link #getWidth()} to see how wide a view is after layout. 7058 * 7059 * @return The measured width of this view as a bit mask. 7060 */ 7061 public final int getMeasuredWidthAndState() { 7062 return mMeasuredWidth; 7063 } 7064 7065 /** 7066 * Like {@link #getMeasuredHeightAndState()}, but only returns the 7067 * raw width component (that is the result is masked by 7068 * {@link #MEASURED_SIZE_MASK}). 7069 * 7070 * @return The raw measured height of this view. 7071 */ 7072 public final int getMeasuredHeight() { 7073 return mMeasuredHeight & MEASURED_SIZE_MASK; 7074 } 7075 7076 /** 7077 * Return the full height measurement information for this view as computed 7078 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 7079 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 7080 * This should be used during measurement and layout calculations only. Use 7081 * {@link #getHeight()} to see how wide a view is after layout. 7082 * 7083 * @return The measured width of this view as a bit mask. 7084 */ 7085 public final int getMeasuredHeightAndState() { 7086 return mMeasuredHeight; 7087 } 7088 7089 /** 7090 * Return only the state bits of {@link #getMeasuredWidthAndState()} 7091 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 7092 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 7093 * and the height component is at the shifted bits 7094 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 7095 */ 7096 public final int getMeasuredState() { 7097 return (mMeasuredWidth&MEASURED_STATE_MASK) 7098 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 7099 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 7100 } 7101 7102 /** 7103 * The transform matrix of this view, which is calculated based on the current 7104 * roation, scale, and pivot properties. 7105 * 7106 * @see #getRotation() 7107 * @see #getScaleX() 7108 * @see #getScaleY() 7109 * @see #getPivotX() 7110 * @see #getPivotY() 7111 * @return The current transform matrix for the view 7112 */ 7113 public Matrix getMatrix() { 7114 if (mTransformationInfo != null) { 7115 updateMatrix(); 7116 return mTransformationInfo.mMatrix; 7117 } 7118 return Matrix.IDENTITY_MATRIX; 7119 } 7120 7121 /** 7122 * Utility function to determine if the value is far enough away from zero to be 7123 * considered non-zero. 7124 * @param value A floating point value to check for zero-ness 7125 * @return whether the passed-in value is far enough away from zero to be considered non-zero 7126 */ 7127 private static boolean nonzero(float value) { 7128 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 7129 } 7130 7131 /** 7132 * Returns true if the transform matrix is the identity matrix. 7133 * Recomputes the matrix if necessary. 7134 * 7135 * @return True if the transform matrix is the identity matrix, false otherwise. 7136 */ 7137 final boolean hasIdentityMatrix() { 7138 if (mTransformationInfo != null) { 7139 updateMatrix(); 7140 return mTransformationInfo.mMatrixIsIdentity; 7141 } 7142 return true; 7143 } 7144 7145 void ensureTransformationInfo() { 7146 if (mTransformationInfo == null) { 7147 mTransformationInfo = new TransformationInfo(); 7148 } 7149 } 7150 7151 /** 7152 * Recomputes the transform matrix if necessary. 7153 */ 7154 private void updateMatrix() { 7155 final TransformationInfo info = mTransformationInfo; 7156 if (info == null) { 7157 return; 7158 } 7159 if (info.mMatrixDirty) { 7160 // transform-related properties have changed since the last time someone 7161 // asked for the matrix; recalculate it with the current values 7162 7163 // Figure out if we need to update the pivot point 7164 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7165 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 7166 info.mPrevWidth = mRight - mLeft; 7167 info.mPrevHeight = mBottom - mTop; 7168 info.mPivotX = info.mPrevWidth / 2f; 7169 info.mPivotY = info.mPrevHeight / 2f; 7170 } 7171 } 7172 info.mMatrix.reset(); 7173 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 7174 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 7175 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 7176 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 7177 } else { 7178 if (info.mCamera == null) { 7179 info.mCamera = new Camera(); 7180 info.matrix3D = new Matrix(); 7181 } 7182 info.mCamera.save(); 7183 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 7184 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 7185 info.mCamera.getMatrix(info.matrix3D); 7186 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 7187 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 7188 info.mPivotY + info.mTranslationY); 7189 info.mMatrix.postConcat(info.matrix3D); 7190 info.mCamera.restore(); 7191 } 7192 info.mMatrixDirty = false; 7193 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 7194 info.mInverseMatrixDirty = true; 7195 } 7196 } 7197 7198 /** 7199 * Utility method to retrieve the inverse of the current mMatrix property. 7200 * We cache the matrix to avoid recalculating it when transform properties 7201 * have not changed. 7202 * 7203 * @return The inverse of the current matrix of this view. 7204 */ 7205 final Matrix getInverseMatrix() { 7206 final TransformationInfo info = mTransformationInfo; 7207 if (info != null) { 7208 updateMatrix(); 7209 if (info.mInverseMatrixDirty) { 7210 if (info.mInverseMatrix == null) { 7211 info.mInverseMatrix = new Matrix(); 7212 } 7213 info.mMatrix.invert(info.mInverseMatrix); 7214 info.mInverseMatrixDirty = false; 7215 } 7216 return info.mInverseMatrix; 7217 } 7218 return Matrix.IDENTITY_MATRIX; 7219 } 7220 7221 /** 7222 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 7223 * views are drawn) from the camera to this view. The camera's distance 7224 * affects 3D transformations, for instance rotations around the X and Y 7225 * axis. If the rotationX or rotationY properties are changed and this view is 7226 * large (more than half the size of the screen), it is recommended to always 7227 * use a camera distance that's greater than the height (X axis rotation) or 7228 * the width (Y axis rotation) of this view.</p> 7229 * 7230 * <p>The distance of the camera from the view plane can have an affect on the 7231 * perspective distortion of the view when it is rotated around the x or y axis. 7232 * For example, a large distance will result in a large viewing angle, and there 7233 * will not be much perspective distortion of the view as it rotates. A short 7234 * distance may cause much more perspective distortion upon rotation, and can 7235 * also result in some drawing artifacts if the rotated view ends up partially 7236 * behind the camera (which is why the recommendation is to use a distance at 7237 * least as far as the size of the view, if the view is to be rotated.)</p> 7238 * 7239 * <p>The distance is expressed in "depth pixels." The default distance depends 7240 * on the screen density. For instance, on a medium density display, the 7241 * default distance is 1280. On a high density display, the default distance 7242 * is 1920.</p> 7243 * 7244 * <p>If you want to specify a distance that leads to visually consistent 7245 * results across various densities, use the following formula:</p> 7246 * <pre> 7247 * float scale = context.getResources().getDisplayMetrics().density; 7248 * view.setCameraDistance(distance * scale); 7249 * </pre> 7250 * 7251 * <p>The density scale factor of a high density display is 1.5, 7252 * and 1920 = 1280 * 1.5.</p> 7253 * 7254 * @param distance The distance in "depth pixels", if negative the opposite 7255 * value is used 7256 * 7257 * @see #setRotationX(float) 7258 * @see #setRotationY(float) 7259 */ 7260 public void setCameraDistance(float distance) { 7261 invalidateParentCaches(); 7262 invalidate(false); 7263 7264 ensureTransformationInfo(); 7265 final float dpi = mResources.getDisplayMetrics().densityDpi; 7266 final TransformationInfo info = mTransformationInfo; 7267 if (info.mCamera == null) { 7268 info.mCamera = new Camera(); 7269 info.matrix3D = new Matrix(); 7270 } 7271 7272 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 7273 info.mMatrixDirty = true; 7274 7275 invalidate(false); 7276 } 7277 7278 /** 7279 * The degrees that the view is rotated around the pivot point. 7280 * 7281 * @see #setRotation(float) 7282 * @see #getPivotX() 7283 * @see #getPivotY() 7284 * 7285 * @return The degrees of rotation. 7286 */ 7287 @ViewDebug.ExportedProperty(category = "drawing") 7288 public float getRotation() { 7289 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 7290 } 7291 7292 /** 7293 * Sets the degrees that the view is rotated around the pivot point. Increasing values 7294 * result in clockwise rotation. 7295 * 7296 * @param rotation The degrees of rotation. 7297 * 7298 * @see #getRotation() 7299 * @see #getPivotX() 7300 * @see #getPivotY() 7301 * @see #setRotationX(float) 7302 * @see #setRotationY(float) 7303 * 7304 * @attr ref android.R.styleable#View_rotation 7305 */ 7306 public void setRotation(float rotation) { 7307 ensureTransformationInfo(); 7308 final TransformationInfo info = mTransformationInfo; 7309 if (info.mRotation != rotation) { 7310 invalidateParentCaches(); 7311 // Double-invalidation is necessary to capture view's old and new areas 7312 invalidate(false); 7313 info.mRotation = rotation; 7314 info.mMatrixDirty = true; 7315 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7316 invalidate(false); 7317 } 7318 } 7319 7320 /** 7321 * The degrees that the view is rotated around the vertical axis through the pivot point. 7322 * 7323 * @see #getPivotX() 7324 * @see #getPivotY() 7325 * @see #setRotationY(float) 7326 * 7327 * @return The degrees of Y rotation. 7328 */ 7329 @ViewDebug.ExportedProperty(category = "drawing") 7330 public float getRotationY() { 7331 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 7332 } 7333 7334 /** 7335 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 7336 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 7337 * down the y axis. 7338 * 7339 * When rotating large views, it is recommended to adjust the camera distance 7340 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7341 * 7342 * @param rotationY The degrees of Y rotation. 7343 * 7344 * @see #getRotationY() 7345 * @see #getPivotX() 7346 * @see #getPivotY() 7347 * @see #setRotation(float) 7348 * @see #setRotationX(float) 7349 * @see #setCameraDistance(float) 7350 * 7351 * @attr ref android.R.styleable#View_rotationY 7352 */ 7353 public void setRotationY(float rotationY) { 7354 ensureTransformationInfo(); 7355 final TransformationInfo info = mTransformationInfo; 7356 if (info.mRotationY != rotationY) { 7357 invalidateParentCaches(); 7358 // Double-invalidation is necessary to capture view's old and new areas 7359 invalidate(false); 7360 info.mRotationY = rotationY; 7361 info.mMatrixDirty = true; 7362 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7363 invalidate(false); 7364 } 7365 } 7366 7367 /** 7368 * The degrees that the view is rotated around the horizontal axis through the pivot point. 7369 * 7370 * @see #getPivotX() 7371 * @see #getPivotY() 7372 * @see #setRotationX(float) 7373 * 7374 * @return The degrees of X rotation. 7375 */ 7376 @ViewDebug.ExportedProperty(category = "drawing") 7377 public float getRotationX() { 7378 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 7379 } 7380 7381 /** 7382 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 7383 * Increasing values result in clockwise rotation from the viewpoint of looking down the 7384 * x axis. 7385 * 7386 * When rotating large views, it is recommended to adjust the camera distance 7387 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7388 * 7389 * @param rotationX The degrees of X rotation. 7390 * 7391 * @see #getRotationX() 7392 * @see #getPivotX() 7393 * @see #getPivotY() 7394 * @see #setRotation(float) 7395 * @see #setRotationY(float) 7396 * @see #setCameraDistance(float) 7397 * 7398 * @attr ref android.R.styleable#View_rotationX 7399 */ 7400 public void setRotationX(float rotationX) { 7401 ensureTransformationInfo(); 7402 final TransformationInfo info = mTransformationInfo; 7403 if (info.mRotationX != rotationX) { 7404 invalidateParentCaches(); 7405 // Double-invalidation is necessary to capture view's old and new areas 7406 invalidate(false); 7407 info.mRotationX = rotationX; 7408 info.mMatrixDirty = true; 7409 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7410 invalidate(false); 7411 } 7412 } 7413 7414 /** 7415 * The amount that the view is scaled in x around the pivot point, as a proportion of 7416 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 7417 * 7418 * <p>By default, this is 1.0f. 7419 * 7420 * @see #getPivotX() 7421 * @see #getPivotY() 7422 * @return The scaling factor. 7423 */ 7424 @ViewDebug.ExportedProperty(category = "drawing") 7425 public float getScaleX() { 7426 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 7427 } 7428 7429 /** 7430 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 7431 * the view's unscaled width. A value of 1 means that no scaling is applied. 7432 * 7433 * @param scaleX The scaling factor. 7434 * @see #getPivotX() 7435 * @see #getPivotY() 7436 * 7437 * @attr ref android.R.styleable#View_scaleX 7438 */ 7439 public void setScaleX(float scaleX) { 7440 ensureTransformationInfo(); 7441 final TransformationInfo info = mTransformationInfo; 7442 if (info.mScaleX != scaleX) { 7443 invalidateParentCaches(); 7444 // Double-invalidation is necessary to capture view's old and new areas 7445 invalidate(false); 7446 info.mScaleX = scaleX; 7447 info.mMatrixDirty = true; 7448 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7449 invalidate(false); 7450 } 7451 } 7452 7453 /** 7454 * The amount that the view is scaled in y around the pivot point, as a proportion of 7455 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 7456 * 7457 * <p>By default, this is 1.0f. 7458 * 7459 * @see #getPivotX() 7460 * @see #getPivotY() 7461 * @return The scaling factor. 7462 */ 7463 @ViewDebug.ExportedProperty(category = "drawing") 7464 public float getScaleY() { 7465 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 7466 } 7467 7468 /** 7469 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 7470 * the view's unscaled width. A value of 1 means that no scaling is applied. 7471 * 7472 * @param scaleY The scaling factor. 7473 * @see #getPivotX() 7474 * @see #getPivotY() 7475 * 7476 * @attr ref android.R.styleable#View_scaleY 7477 */ 7478 public void setScaleY(float scaleY) { 7479 ensureTransformationInfo(); 7480 final TransformationInfo info = mTransformationInfo; 7481 if (info.mScaleY != scaleY) { 7482 invalidateParentCaches(); 7483 // Double-invalidation is necessary to capture view's old and new areas 7484 invalidate(false); 7485 info.mScaleY = scaleY; 7486 info.mMatrixDirty = true; 7487 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7488 invalidate(false); 7489 } 7490 } 7491 7492 /** 7493 * The x location of the point around which the view is {@link #setRotation(float) rotated} 7494 * and {@link #setScaleX(float) scaled}. 7495 * 7496 * @see #getRotation() 7497 * @see #getScaleX() 7498 * @see #getScaleY() 7499 * @see #getPivotY() 7500 * @return The x location of the pivot point. 7501 */ 7502 @ViewDebug.ExportedProperty(category = "drawing") 7503 public float getPivotX() { 7504 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 7505 } 7506 7507 /** 7508 * Sets the x location of the point around which the view is 7509 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 7510 * By default, the pivot point is centered on the object. 7511 * Setting this property disables this behavior and causes the view to use only the 7512 * explicitly set pivotX and pivotY values. 7513 * 7514 * @param pivotX The x location of the pivot point. 7515 * @see #getRotation() 7516 * @see #getScaleX() 7517 * @see #getScaleY() 7518 * @see #getPivotY() 7519 * 7520 * @attr ref android.R.styleable#View_transformPivotX 7521 */ 7522 public void setPivotX(float pivotX) { 7523 ensureTransformationInfo(); 7524 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7525 final TransformationInfo info = mTransformationInfo; 7526 if (info.mPivotX != pivotX) { 7527 invalidateParentCaches(); 7528 // Double-invalidation is necessary to capture view's old and new areas 7529 invalidate(false); 7530 info.mPivotX = pivotX; 7531 info.mMatrixDirty = true; 7532 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7533 invalidate(false); 7534 } 7535 } 7536 7537 /** 7538 * The y location of the point around which the view is {@link #setRotation(float) rotated} 7539 * and {@link #setScaleY(float) scaled}. 7540 * 7541 * @see #getRotation() 7542 * @see #getScaleX() 7543 * @see #getScaleY() 7544 * @see #getPivotY() 7545 * @return The y location of the pivot point. 7546 */ 7547 @ViewDebug.ExportedProperty(category = "drawing") 7548 public float getPivotY() { 7549 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 7550 } 7551 7552 /** 7553 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 7554 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 7555 * Setting this property disables this behavior and causes the view to use only the 7556 * explicitly set pivotX and pivotY values. 7557 * 7558 * @param pivotY The y location of the pivot point. 7559 * @see #getRotation() 7560 * @see #getScaleX() 7561 * @see #getScaleY() 7562 * @see #getPivotY() 7563 * 7564 * @attr ref android.R.styleable#View_transformPivotY 7565 */ 7566 public void setPivotY(float pivotY) { 7567 ensureTransformationInfo(); 7568 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7569 final TransformationInfo info = mTransformationInfo; 7570 if (info.mPivotY != pivotY) { 7571 invalidateParentCaches(); 7572 // Double-invalidation is necessary to capture view's old and new areas 7573 invalidate(false); 7574 info.mPivotY = pivotY; 7575 info.mMatrixDirty = true; 7576 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7577 invalidate(false); 7578 } 7579 } 7580 7581 /** 7582 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 7583 * completely transparent and 1 means the view is completely opaque. 7584 * 7585 * <p>By default this is 1.0f. 7586 * @return The opacity of the view. 7587 */ 7588 @ViewDebug.ExportedProperty(category = "drawing") 7589 public float getAlpha() { 7590 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 7591 } 7592 7593 /** 7594 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 7595 * completely transparent and 1 means the view is completely opaque.</p> 7596 * 7597 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 7598 * responsible for applying the opacity itself. Otherwise, calling this method is 7599 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 7600 * setting a hardware layer.</p> 7601 * 7602 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 7603 * performance implications. It is generally best to use the alpha property sparingly and 7604 * transiently, as in the case of fading animations.</p> 7605 * 7606 * @param alpha The opacity of the view. 7607 * 7608 * @see #setLayerType(int, android.graphics.Paint) 7609 * 7610 * @attr ref android.R.styleable#View_alpha 7611 */ 7612 public void setAlpha(float alpha) { 7613 ensureTransformationInfo(); 7614 if (mTransformationInfo.mAlpha != alpha) { 7615 mTransformationInfo.mAlpha = alpha; 7616 invalidateParentCaches(); 7617 if (onSetAlpha((int) (alpha * 255))) { 7618 mPrivateFlags |= ALPHA_SET; 7619 // subclass is handling alpha - don't optimize rendering cache invalidation 7620 invalidate(true); 7621 } else { 7622 mPrivateFlags &= ~ALPHA_SET; 7623 invalidate(false); 7624 } 7625 } 7626 } 7627 7628 /** 7629 * Faster version of setAlpha() which performs the same steps except there are 7630 * no calls to invalidate(). The caller of this function should perform proper invalidation 7631 * on the parent and this object. The return value indicates whether the subclass handles 7632 * alpha (the return value for onSetAlpha()). 7633 * 7634 * @param alpha The new value for the alpha property 7635 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 7636 * the new value for the alpha property is different from the old value 7637 */ 7638 boolean setAlphaNoInvalidation(float alpha) { 7639 ensureTransformationInfo(); 7640 if (mTransformationInfo.mAlpha != alpha) { 7641 mTransformationInfo.mAlpha = alpha; 7642 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 7643 if (subclassHandlesAlpha) { 7644 mPrivateFlags |= ALPHA_SET; 7645 return true; 7646 } else { 7647 mPrivateFlags &= ~ALPHA_SET; 7648 } 7649 } 7650 return false; 7651 } 7652 7653 /** 7654 * Top position of this view relative to its parent. 7655 * 7656 * @return The top of this view, in pixels. 7657 */ 7658 @ViewDebug.CapturedViewProperty 7659 public final int getTop() { 7660 return mTop; 7661 } 7662 7663 /** 7664 * Sets the top position of this view relative to its parent. This method is meant to be called 7665 * by the layout system and should not generally be called otherwise, because the property 7666 * may be changed at any time by the layout. 7667 * 7668 * @param top The top of this view, in pixels. 7669 */ 7670 public final void setTop(int top) { 7671 if (top != mTop) { 7672 updateMatrix(); 7673 final boolean matrixIsIdentity = mTransformationInfo == null 7674 || mTransformationInfo.mMatrixIsIdentity; 7675 if (matrixIsIdentity) { 7676 if (mAttachInfo != null) { 7677 int minTop; 7678 int yLoc; 7679 if (top < mTop) { 7680 minTop = top; 7681 yLoc = top - mTop; 7682 } else { 7683 minTop = mTop; 7684 yLoc = 0; 7685 } 7686 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 7687 } 7688 } else { 7689 // Double-invalidation is necessary to capture view's old and new areas 7690 invalidate(true); 7691 } 7692 7693 int width = mRight - mLeft; 7694 int oldHeight = mBottom - mTop; 7695 7696 mTop = top; 7697 7698 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7699 7700 if (!matrixIsIdentity) { 7701 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7702 // A change in dimension means an auto-centered pivot point changes, too 7703 mTransformationInfo.mMatrixDirty = true; 7704 } 7705 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7706 invalidate(true); 7707 } 7708 mBackgroundSizeChanged = true; 7709 invalidateParentIfNeeded(); 7710 } 7711 } 7712 7713 /** 7714 * Bottom position of this view relative to its parent. 7715 * 7716 * @return The bottom of this view, in pixels. 7717 */ 7718 @ViewDebug.CapturedViewProperty 7719 public final int getBottom() { 7720 return mBottom; 7721 } 7722 7723 /** 7724 * True if this view has changed since the last time being drawn. 7725 * 7726 * @return The dirty state of this view. 7727 */ 7728 public boolean isDirty() { 7729 return (mPrivateFlags & DIRTY_MASK) != 0; 7730 } 7731 7732 /** 7733 * Sets the bottom position of this view relative to its parent. This method is meant to be 7734 * called by the layout system and should not generally be called otherwise, because the 7735 * property may be changed at any time by the layout. 7736 * 7737 * @param bottom The bottom of this view, in pixels. 7738 */ 7739 public final void setBottom(int bottom) { 7740 if (bottom != mBottom) { 7741 updateMatrix(); 7742 final boolean matrixIsIdentity = mTransformationInfo == null 7743 || mTransformationInfo.mMatrixIsIdentity; 7744 if (matrixIsIdentity) { 7745 if (mAttachInfo != null) { 7746 int maxBottom; 7747 if (bottom < mBottom) { 7748 maxBottom = mBottom; 7749 } else { 7750 maxBottom = bottom; 7751 } 7752 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 7753 } 7754 } else { 7755 // Double-invalidation is necessary to capture view's old and new areas 7756 invalidate(true); 7757 } 7758 7759 int width = mRight - mLeft; 7760 int oldHeight = mBottom - mTop; 7761 7762 mBottom = bottom; 7763 7764 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7765 7766 if (!matrixIsIdentity) { 7767 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7768 // A change in dimension means an auto-centered pivot point changes, too 7769 mTransformationInfo.mMatrixDirty = true; 7770 } 7771 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7772 invalidate(true); 7773 } 7774 mBackgroundSizeChanged = true; 7775 invalidateParentIfNeeded(); 7776 } 7777 } 7778 7779 /** 7780 * Left position of this view relative to its parent. 7781 * 7782 * @return The left edge of this view, in pixels. 7783 */ 7784 @ViewDebug.CapturedViewProperty 7785 public final int getLeft() { 7786 return mLeft; 7787 } 7788 7789 /** 7790 * Sets the left position of this view relative to its parent. This method is meant to be called 7791 * by the layout system and should not generally be called otherwise, because the property 7792 * may be changed at any time by the layout. 7793 * 7794 * @param left The bottom of this view, in pixels. 7795 */ 7796 public final void setLeft(int left) { 7797 if (left != mLeft) { 7798 updateMatrix(); 7799 final boolean matrixIsIdentity = mTransformationInfo == null 7800 || mTransformationInfo.mMatrixIsIdentity; 7801 if (matrixIsIdentity) { 7802 if (mAttachInfo != null) { 7803 int minLeft; 7804 int xLoc; 7805 if (left < mLeft) { 7806 minLeft = left; 7807 xLoc = left - mLeft; 7808 } else { 7809 minLeft = mLeft; 7810 xLoc = 0; 7811 } 7812 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 7813 } 7814 } else { 7815 // Double-invalidation is necessary to capture view's old and new areas 7816 invalidate(true); 7817 } 7818 7819 int oldWidth = mRight - mLeft; 7820 int height = mBottom - mTop; 7821 7822 mLeft = left; 7823 7824 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7825 7826 if (!matrixIsIdentity) { 7827 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7828 // A change in dimension means an auto-centered pivot point changes, too 7829 mTransformationInfo.mMatrixDirty = true; 7830 } 7831 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7832 invalidate(true); 7833 } 7834 mBackgroundSizeChanged = true; 7835 invalidateParentIfNeeded(); 7836 } 7837 } 7838 7839 /** 7840 * Right position of this view relative to its parent. 7841 * 7842 * @return The right edge of this view, in pixels. 7843 */ 7844 @ViewDebug.CapturedViewProperty 7845 public final int getRight() { 7846 return mRight; 7847 } 7848 7849 /** 7850 * Sets the right position of this view relative to its parent. This method is meant to be called 7851 * by the layout system and should not generally be called otherwise, because the property 7852 * may be changed at any time by the layout. 7853 * 7854 * @param right The bottom of this view, in pixels. 7855 */ 7856 public final void setRight(int right) { 7857 if (right != mRight) { 7858 updateMatrix(); 7859 final boolean matrixIsIdentity = mTransformationInfo == null 7860 || mTransformationInfo.mMatrixIsIdentity; 7861 if (matrixIsIdentity) { 7862 if (mAttachInfo != null) { 7863 int maxRight; 7864 if (right < mRight) { 7865 maxRight = mRight; 7866 } else { 7867 maxRight = right; 7868 } 7869 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 7870 } 7871 } else { 7872 // Double-invalidation is necessary to capture view's old and new areas 7873 invalidate(true); 7874 } 7875 7876 int oldWidth = mRight - mLeft; 7877 int height = mBottom - mTop; 7878 7879 mRight = right; 7880 7881 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7882 7883 if (!matrixIsIdentity) { 7884 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7885 // A change in dimension means an auto-centered pivot point changes, too 7886 mTransformationInfo.mMatrixDirty = true; 7887 } 7888 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7889 invalidate(true); 7890 } 7891 mBackgroundSizeChanged = true; 7892 invalidateParentIfNeeded(); 7893 } 7894 } 7895 7896 /** 7897 * The visual x position of this view, in pixels. This is equivalent to the 7898 * {@link #setTranslationX(float) translationX} property plus the current 7899 * {@link #getLeft() left} property. 7900 * 7901 * @return The visual x position of this view, in pixels. 7902 */ 7903 @ViewDebug.ExportedProperty(category = "drawing") 7904 public float getX() { 7905 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 7906 } 7907 7908 /** 7909 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 7910 * {@link #setTranslationX(float) translationX} property to be the difference between 7911 * the x value passed in and the current {@link #getLeft() left} property. 7912 * 7913 * @param x The visual x position of this view, in pixels. 7914 */ 7915 public void setX(float x) { 7916 setTranslationX(x - mLeft); 7917 } 7918 7919 /** 7920 * The visual y position of this view, in pixels. This is equivalent to the 7921 * {@link #setTranslationY(float) translationY} property plus the current 7922 * {@link #getTop() top} property. 7923 * 7924 * @return The visual y position of this view, in pixels. 7925 */ 7926 @ViewDebug.ExportedProperty(category = "drawing") 7927 public float getY() { 7928 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 7929 } 7930 7931 /** 7932 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 7933 * {@link #setTranslationY(float) translationY} property to be the difference between 7934 * the y value passed in and the current {@link #getTop() top} property. 7935 * 7936 * @param y The visual y position of this view, in pixels. 7937 */ 7938 public void setY(float y) { 7939 setTranslationY(y - mTop); 7940 } 7941 7942 7943 /** 7944 * The horizontal location of this view relative to its {@link #getLeft() left} position. 7945 * This position is post-layout, in addition to wherever the object's 7946 * layout placed it. 7947 * 7948 * @return The horizontal position of this view relative to its left position, in pixels. 7949 */ 7950 @ViewDebug.ExportedProperty(category = "drawing") 7951 public float getTranslationX() { 7952 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 7953 } 7954 7955 /** 7956 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 7957 * This effectively positions the object post-layout, in addition to wherever the object's 7958 * layout placed it. 7959 * 7960 * @param translationX The horizontal position of this view relative to its left position, 7961 * in pixels. 7962 * 7963 * @attr ref android.R.styleable#View_translationX 7964 */ 7965 public void setTranslationX(float translationX) { 7966 ensureTransformationInfo(); 7967 final TransformationInfo info = mTransformationInfo; 7968 if (info.mTranslationX != translationX) { 7969 invalidateParentCaches(); 7970 // Double-invalidation is necessary to capture view's old and new areas 7971 invalidate(false); 7972 info.mTranslationX = translationX; 7973 info.mMatrixDirty = true; 7974 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7975 invalidate(false); 7976 } 7977 } 7978 7979 /** 7980 * The horizontal location of this view relative to its {@link #getTop() top} position. 7981 * This position is post-layout, in addition to wherever the object's 7982 * layout placed it. 7983 * 7984 * @return The vertical position of this view relative to its top position, 7985 * in pixels. 7986 */ 7987 @ViewDebug.ExportedProperty(category = "drawing") 7988 public float getTranslationY() { 7989 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 7990 } 7991 7992 /** 7993 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 7994 * This effectively positions the object post-layout, in addition to wherever the object's 7995 * layout placed it. 7996 * 7997 * @param translationY The vertical position of this view relative to its top position, 7998 * in pixels. 7999 * 8000 * @attr ref android.R.styleable#View_translationY 8001 */ 8002 public void setTranslationY(float translationY) { 8003 ensureTransformationInfo(); 8004 final TransformationInfo info = mTransformationInfo; 8005 if (info.mTranslationY != translationY) { 8006 invalidateParentCaches(); 8007 // Double-invalidation is necessary to capture view's old and new areas 8008 invalidate(false); 8009 info.mTranslationY = translationY; 8010 info.mMatrixDirty = true; 8011 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8012 invalidate(false); 8013 } 8014 } 8015 8016 /** 8017 * Hit rectangle in parent's coordinates 8018 * 8019 * @param outRect The hit rectangle of the view. 8020 */ 8021 public void getHitRect(Rect outRect) { 8022 updateMatrix(); 8023 final TransformationInfo info = mTransformationInfo; 8024 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 8025 outRect.set(mLeft, mTop, mRight, mBottom); 8026 } else { 8027 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 8028 tmpRect.set(-info.mPivotX, -info.mPivotY, 8029 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 8030 info.mMatrix.mapRect(tmpRect); 8031 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 8032 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 8033 } 8034 } 8035 8036 /** 8037 * Determines whether the given point, in local coordinates is inside the view. 8038 */ 8039 /*package*/ final boolean pointInView(float localX, float localY) { 8040 return localX >= 0 && localX < (mRight - mLeft) 8041 && localY >= 0 && localY < (mBottom - mTop); 8042 } 8043 8044 /** 8045 * Utility method to determine whether the given point, in local coordinates, 8046 * is inside the view, where the area of the view is expanded by the slop factor. 8047 * This method is called while processing touch-move events to determine if the event 8048 * is still within the view. 8049 */ 8050 private boolean pointInView(float localX, float localY, float slop) { 8051 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 8052 localY < ((mBottom - mTop) + slop); 8053 } 8054 8055 /** 8056 * When a view has focus and the user navigates away from it, the next view is searched for 8057 * starting from the rectangle filled in by this method. 8058 * 8059 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 8060 * of the view. However, if your view maintains some idea of internal selection, 8061 * such as a cursor, or a selected row or column, you should override this method and 8062 * fill in a more specific rectangle. 8063 * 8064 * @param r The rectangle to fill in, in this view's coordinates. 8065 */ 8066 public void getFocusedRect(Rect r) { 8067 getDrawingRect(r); 8068 } 8069 8070 /** 8071 * If some part of this view is not clipped by any of its parents, then 8072 * return that area in r in global (root) coordinates. To convert r to local 8073 * coordinates (without taking possible View rotations into account), offset 8074 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 8075 * If the view is completely clipped or translated out, return false. 8076 * 8077 * @param r If true is returned, r holds the global coordinates of the 8078 * visible portion of this view. 8079 * @param globalOffset If true is returned, globalOffset holds the dx,dy 8080 * between this view and its root. globalOffet may be null. 8081 * @return true if r is non-empty (i.e. part of the view is visible at the 8082 * root level. 8083 */ 8084 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 8085 int width = mRight - mLeft; 8086 int height = mBottom - mTop; 8087 if (width > 0 && height > 0) { 8088 r.set(0, 0, width, height); 8089 if (globalOffset != null) { 8090 globalOffset.set(-mScrollX, -mScrollY); 8091 } 8092 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 8093 } 8094 return false; 8095 } 8096 8097 public final boolean getGlobalVisibleRect(Rect r) { 8098 return getGlobalVisibleRect(r, null); 8099 } 8100 8101 public final boolean getLocalVisibleRect(Rect r) { 8102 Point offset = new Point(); 8103 if (getGlobalVisibleRect(r, offset)) { 8104 r.offset(-offset.x, -offset.y); // make r local 8105 return true; 8106 } 8107 return false; 8108 } 8109 8110 /** 8111 * Offset this view's vertical location by the specified number of pixels. 8112 * 8113 * @param offset the number of pixels to offset the view by 8114 */ 8115 public void offsetTopAndBottom(int offset) { 8116 if (offset != 0) { 8117 updateMatrix(); 8118 final boolean matrixIsIdentity = mTransformationInfo == null 8119 || mTransformationInfo.mMatrixIsIdentity; 8120 if (matrixIsIdentity) { 8121 final ViewParent p = mParent; 8122 if (p != null && mAttachInfo != null) { 8123 final Rect r = mAttachInfo.mTmpInvalRect; 8124 int minTop; 8125 int maxBottom; 8126 int yLoc; 8127 if (offset < 0) { 8128 minTop = mTop + offset; 8129 maxBottom = mBottom; 8130 yLoc = offset; 8131 } else { 8132 minTop = mTop; 8133 maxBottom = mBottom + offset; 8134 yLoc = 0; 8135 } 8136 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 8137 p.invalidateChild(this, r); 8138 } 8139 } else { 8140 invalidate(false); 8141 } 8142 8143 mTop += offset; 8144 mBottom += offset; 8145 8146 if (!matrixIsIdentity) { 8147 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8148 invalidate(false); 8149 } 8150 invalidateParentIfNeeded(); 8151 } 8152 } 8153 8154 /** 8155 * Offset this view's horizontal location by the specified amount of pixels. 8156 * 8157 * @param offset the numer of pixels to offset the view by 8158 */ 8159 public void offsetLeftAndRight(int offset) { 8160 if (offset != 0) { 8161 updateMatrix(); 8162 final boolean matrixIsIdentity = mTransformationInfo == null 8163 || mTransformationInfo.mMatrixIsIdentity; 8164 if (matrixIsIdentity) { 8165 final ViewParent p = mParent; 8166 if (p != null && mAttachInfo != null) { 8167 final Rect r = mAttachInfo.mTmpInvalRect; 8168 int minLeft; 8169 int maxRight; 8170 if (offset < 0) { 8171 minLeft = mLeft + offset; 8172 maxRight = mRight; 8173 } else { 8174 minLeft = mLeft; 8175 maxRight = mRight + offset; 8176 } 8177 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 8178 p.invalidateChild(this, r); 8179 } 8180 } else { 8181 invalidate(false); 8182 } 8183 8184 mLeft += offset; 8185 mRight += offset; 8186 8187 if (!matrixIsIdentity) { 8188 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8189 invalidate(false); 8190 } 8191 invalidateParentIfNeeded(); 8192 } 8193 } 8194 8195 /** 8196 * Get the LayoutParams associated with this view. All views should have 8197 * layout parameters. These supply parameters to the <i>parent</i> of this 8198 * view specifying how it should be arranged. There are many subclasses of 8199 * ViewGroup.LayoutParams, and these correspond to the different subclasses 8200 * of ViewGroup that are responsible for arranging their children. 8201 * 8202 * This method may return null if this View is not attached to a parent 8203 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 8204 * was not invoked successfully. When a View is attached to a parent 8205 * ViewGroup, this method must not return null. 8206 * 8207 * @return The LayoutParams associated with this view, or null if no 8208 * parameters have been set yet 8209 */ 8210 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 8211 public ViewGroup.LayoutParams getLayoutParams() { 8212 return mLayoutParams; 8213 } 8214 8215 /** 8216 * Set the layout parameters associated with this view. These supply 8217 * parameters to the <i>parent</i> of this view specifying how it should be 8218 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 8219 * correspond to the different subclasses of ViewGroup that are responsible 8220 * for arranging their children. 8221 * 8222 * @param params The layout parameters for this view, cannot be null 8223 */ 8224 public void setLayoutParams(ViewGroup.LayoutParams params) { 8225 if (params == null) { 8226 throw new NullPointerException("Layout parameters cannot be null"); 8227 } 8228 mLayoutParams = params; 8229 if (mParent instanceof ViewGroup) { 8230 ((ViewGroup) mParent).onSetLayoutParams(this, params); 8231 } 8232 requestLayout(); 8233 } 8234 8235 /** 8236 * Set the scrolled position of your view. This will cause a call to 8237 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8238 * invalidated. 8239 * @param x the x position to scroll to 8240 * @param y the y position to scroll to 8241 */ 8242 public void scrollTo(int x, int y) { 8243 if (mScrollX != x || mScrollY != y) { 8244 int oldX = mScrollX; 8245 int oldY = mScrollY; 8246 mScrollX = x; 8247 mScrollY = y; 8248 invalidateParentCaches(); 8249 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 8250 if (!awakenScrollBars()) { 8251 invalidate(true); 8252 } 8253 } 8254 } 8255 8256 /** 8257 * Move the scrolled position of your view. This will cause a call to 8258 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8259 * invalidated. 8260 * @param x the amount of pixels to scroll by horizontally 8261 * @param y the amount of pixels to scroll by vertically 8262 */ 8263 public void scrollBy(int x, int y) { 8264 scrollTo(mScrollX + x, mScrollY + y); 8265 } 8266 8267 /** 8268 * <p>Trigger the scrollbars to draw. When invoked this method starts an 8269 * animation to fade the scrollbars out after a default delay. If a subclass 8270 * provides animated scrolling, the start delay should equal the duration 8271 * of the scrolling animation.</p> 8272 * 8273 * <p>The animation starts only if at least one of the scrollbars is 8274 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 8275 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8276 * this method returns true, and false otherwise. If the animation is 8277 * started, this method calls {@link #invalidate()}; in that case the 8278 * caller should not call {@link #invalidate()}.</p> 8279 * 8280 * <p>This method should be invoked every time a subclass directly updates 8281 * the scroll parameters.</p> 8282 * 8283 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 8284 * and {@link #scrollTo(int, int)}.</p> 8285 * 8286 * @return true if the animation is played, false otherwise 8287 * 8288 * @see #awakenScrollBars(int) 8289 * @see #scrollBy(int, int) 8290 * @see #scrollTo(int, int) 8291 * @see #isHorizontalScrollBarEnabled() 8292 * @see #isVerticalScrollBarEnabled() 8293 * @see #setHorizontalScrollBarEnabled(boolean) 8294 * @see #setVerticalScrollBarEnabled(boolean) 8295 */ 8296 protected boolean awakenScrollBars() { 8297 return mScrollCache != null && 8298 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 8299 } 8300 8301 /** 8302 * Trigger the scrollbars to draw. 8303 * This method differs from awakenScrollBars() only in its default duration. 8304 * initialAwakenScrollBars() will show the scroll bars for longer than 8305 * usual to give the user more of a chance to notice them. 8306 * 8307 * @return true if the animation is played, false otherwise. 8308 */ 8309 private boolean initialAwakenScrollBars() { 8310 return mScrollCache != null && 8311 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 8312 } 8313 8314 /** 8315 * <p> 8316 * Trigger the scrollbars to draw. When invoked this method starts an 8317 * animation to fade the scrollbars out after a fixed delay. If a subclass 8318 * provides animated scrolling, the start delay should equal the duration of 8319 * the scrolling animation. 8320 * </p> 8321 * 8322 * <p> 8323 * The animation starts only if at least one of the scrollbars is enabled, 8324 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8325 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8326 * this method returns true, and false otherwise. If the animation is 8327 * started, this method calls {@link #invalidate()}; in that case the caller 8328 * should not call {@link #invalidate()}. 8329 * </p> 8330 * 8331 * <p> 8332 * This method should be invoked everytime a subclass directly updates the 8333 * scroll parameters. 8334 * </p> 8335 * 8336 * @param startDelay the delay, in milliseconds, after which the animation 8337 * should start; when the delay is 0, the animation starts 8338 * immediately 8339 * @return true if the animation is played, false otherwise 8340 * 8341 * @see #scrollBy(int, int) 8342 * @see #scrollTo(int, int) 8343 * @see #isHorizontalScrollBarEnabled() 8344 * @see #isVerticalScrollBarEnabled() 8345 * @see #setHorizontalScrollBarEnabled(boolean) 8346 * @see #setVerticalScrollBarEnabled(boolean) 8347 */ 8348 protected boolean awakenScrollBars(int startDelay) { 8349 return awakenScrollBars(startDelay, true); 8350 } 8351 8352 /** 8353 * <p> 8354 * Trigger the scrollbars to draw. When invoked this method starts an 8355 * animation to fade the scrollbars out after a fixed delay. If a subclass 8356 * provides animated scrolling, the start delay should equal the duration of 8357 * the scrolling animation. 8358 * </p> 8359 * 8360 * <p> 8361 * The animation starts only if at least one of the scrollbars is enabled, 8362 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8363 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8364 * this method returns true, and false otherwise. If the animation is 8365 * started, this method calls {@link #invalidate()} if the invalidate parameter 8366 * is set to true; in that case the caller 8367 * should not call {@link #invalidate()}. 8368 * </p> 8369 * 8370 * <p> 8371 * This method should be invoked everytime a subclass directly updates the 8372 * scroll parameters. 8373 * </p> 8374 * 8375 * @param startDelay the delay, in milliseconds, after which the animation 8376 * should start; when the delay is 0, the animation starts 8377 * immediately 8378 * 8379 * @param invalidate Wheter this method should call invalidate 8380 * 8381 * @return true if the animation is played, false otherwise 8382 * 8383 * @see #scrollBy(int, int) 8384 * @see #scrollTo(int, int) 8385 * @see #isHorizontalScrollBarEnabled() 8386 * @see #isVerticalScrollBarEnabled() 8387 * @see #setHorizontalScrollBarEnabled(boolean) 8388 * @see #setVerticalScrollBarEnabled(boolean) 8389 */ 8390 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 8391 final ScrollabilityCache scrollCache = mScrollCache; 8392 8393 if (scrollCache == null || !scrollCache.fadeScrollBars) { 8394 return false; 8395 } 8396 8397 if (scrollCache.scrollBar == null) { 8398 scrollCache.scrollBar = new ScrollBarDrawable(); 8399 } 8400 8401 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 8402 8403 if (invalidate) { 8404 // Invalidate to show the scrollbars 8405 invalidate(true); 8406 } 8407 8408 if (scrollCache.state == ScrollabilityCache.OFF) { 8409 // FIXME: this is copied from WindowManagerService. 8410 // We should get this value from the system when it 8411 // is possible to do so. 8412 final int KEY_REPEAT_FIRST_DELAY = 750; 8413 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 8414 } 8415 8416 // Tell mScrollCache when we should start fading. This may 8417 // extend the fade start time if one was already scheduled 8418 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 8419 scrollCache.fadeStartTime = fadeStartTime; 8420 scrollCache.state = ScrollabilityCache.ON; 8421 8422 // Schedule our fader to run, unscheduling any old ones first 8423 if (mAttachInfo != null) { 8424 mAttachInfo.mHandler.removeCallbacks(scrollCache); 8425 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 8426 } 8427 8428 return true; 8429 } 8430 8431 return false; 8432 } 8433 8434 /** 8435 * Do not invalidate views which are not visible and which are not running an animation. They 8436 * will not get drawn and they should not set dirty flags as if they will be drawn 8437 */ 8438 private boolean skipInvalidate() { 8439 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 8440 (!(mParent instanceof ViewGroup) || 8441 !((ViewGroup) mParent).isViewTransitioning(this)); 8442 } 8443 /** 8444 * Mark the area defined by dirty as needing to be drawn. If the view is 8445 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 8446 * in the future. This must be called from a UI thread. To call from a non-UI 8447 * thread, call {@link #postInvalidate()}. 8448 * 8449 * WARNING: This method is destructive to dirty. 8450 * @param dirty the rectangle representing the bounds of the dirty region 8451 */ 8452 public void invalidate(Rect dirty) { 8453 if (ViewDebug.TRACE_HIERARCHY) { 8454 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8455 } 8456 8457 if (skipInvalidate()) { 8458 return; 8459 } 8460 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8461 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8462 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8463 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8464 mPrivateFlags |= INVALIDATED; 8465 mPrivateFlags |= DIRTY; 8466 final ViewParent p = mParent; 8467 final AttachInfo ai = mAttachInfo; 8468 //noinspection PointlessBooleanExpression,ConstantConditions 8469 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8470 if (p != null && ai != null && ai.mHardwareAccelerated) { 8471 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8472 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8473 p.invalidateChild(this, null); 8474 return; 8475 } 8476 } 8477 if (p != null && ai != null) { 8478 final int scrollX = mScrollX; 8479 final int scrollY = mScrollY; 8480 final Rect r = ai.mTmpInvalRect; 8481 r.set(dirty.left - scrollX, dirty.top - scrollY, 8482 dirty.right - scrollX, dirty.bottom - scrollY); 8483 mParent.invalidateChild(this, r); 8484 } 8485 } 8486 } 8487 8488 /** 8489 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 8490 * The coordinates of the dirty rect are relative to the view. 8491 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 8492 * will be called at some point in the future. This must be called from 8493 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 8494 * @param l the left position of the dirty region 8495 * @param t the top position of the dirty region 8496 * @param r the right position of the dirty region 8497 * @param b the bottom position of the dirty region 8498 */ 8499 public void invalidate(int l, int t, int r, int b) { 8500 if (ViewDebug.TRACE_HIERARCHY) { 8501 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8502 } 8503 8504 if (skipInvalidate()) { 8505 return; 8506 } 8507 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8508 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8509 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8510 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8511 mPrivateFlags |= INVALIDATED; 8512 mPrivateFlags |= DIRTY; 8513 final ViewParent p = mParent; 8514 final AttachInfo ai = mAttachInfo; 8515 //noinspection PointlessBooleanExpression,ConstantConditions 8516 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8517 if (p != null && ai != null && ai.mHardwareAccelerated) { 8518 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8519 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8520 p.invalidateChild(this, null); 8521 return; 8522 } 8523 } 8524 if (p != null && ai != null && l < r && t < b) { 8525 final int scrollX = mScrollX; 8526 final int scrollY = mScrollY; 8527 final Rect tmpr = ai.mTmpInvalRect; 8528 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 8529 p.invalidateChild(this, tmpr); 8530 } 8531 } 8532 } 8533 8534 /** 8535 * Invalidate the whole view. If the view is visible, 8536 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 8537 * the future. This must be called from a UI thread. To call from a non-UI thread, 8538 * call {@link #postInvalidate()}. 8539 */ 8540 public void invalidate() { 8541 invalidate(true); 8542 } 8543 8544 /** 8545 * This is where the invalidate() work actually happens. A full invalidate() 8546 * causes the drawing cache to be invalidated, but this function can be called with 8547 * invalidateCache set to false to skip that invalidation step for cases that do not 8548 * need it (for example, a component that remains at the same dimensions with the same 8549 * content). 8550 * 8551 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 8552 * well. This is usually true for a full invalidate, but may be set to false if the 8553 * View's contents or dimensions have not changed. 8554 */ 8555 void invalidate(boolean invalidateCache) { 8556 if (ViewDebug.TRACE_HIERARCHY) { 8557 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8558 } 8559 8560 if (skipInvalidate()) { 8561 return; 8562 } 8563 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8564 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 8565 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 8566 mLastIsOpaque = isOpaque(); 8567 mPrivateFlags &= ~DRAWN; 8568 mPrivateFlags |= DIRTY; 8569 if (invalidateCache) { 8570 mPrivateFlags |= INVALIDATED; 8571 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8572 } 8573 final AttachInfo ai = mAttachInfo; 8574 final ViewParent p = mParent; 8575 //noinspection PointlessBooleanExpression,ConstantConditions 8576 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8577 if (p != null && ai != null && ai.mHardwareAccelerated) { 8578 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8579 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8580 p.invalidateChild(this, null); 8581 return; 8582 } 8583 } 8584 8585 if (p != null && ai != null) { 8586 final Rect r = ai.mTmpInvalRect; 8587 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8588 // Don't call invalidate -- we don't want to internally scroll 8589 // our own bounds 8590 p.invalidateChild(this, r); 8591 } 8592 } 8593 } 8594 8595 /** 8596 * Used to indicate that the parent of this view should clear its caches. This functionality 8597 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8598 * which is necessary when various parent-managed properties of the view change, such as 8599 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 8600 * clears the parent caches and does not causes an invalidate event. 8601 * 8602 * @hide 8603 */ 8604 protected void invalidateParentCaches() { 8605 if (mParent instanceof View) { 8606 ((View) mParent).mPrivateFlags |= INVALIDATED; 8607 } 8608 } 8609 8610 /** 8611 * Used to indicate that the parent of this view should be invalidated. This functionality 8612 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8613 * which is necessary when various parent-managed properties of the view change, such as 8614 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 8615 * an invalidation event to the parent. 8616 * 8617 * @hide 8618 */ 8619 protected void invalidateParentIfNeeded() { 8620 if (isHardwareAccelerated() && mParent instanceof View) { 8621 ((View) mParent).invalidate(true); 8622 } 8623 } 8624 8625 /** 8626 * Indicates whether this View is opaque. An opaque View guarantees that it will 8627 * draw all the pixels overlapping its bounds using a fully opaque color. 8628 * 8629 * Subclasses of View should override this method whenever possible to indicate 8630 * whether an instance is opaque. Opaque Views are treated in a special way by 8631 * the View hierarchy, possibly allowing it to perform optimizations during 8632 * invalidate/draw passes. 8633 * 8634 * @return True if this View is guaranteed to be fully opaque, false otherwise. 8635 */ 8636 @ViewDebug.ExportedProperty(category = "drawing") 8637 public boolean isOpaque() { 8638 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 8639 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 8640 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 8641 } 8642 8643 /** 8644 * @hide 8645 */ 8646 protected void computeOpaqueFlags() { 8647 // Opaque if: 8648 // - Has a background 8649 // - Background is opaque 8650 // - Doesn't have scrollbars or scrollbars are inside overlay 8651 8652 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 8653 mPrivateFlags |= OPAQUE_BACKGROUND; 8654 } else { 8655 mPrivateFlags &= ~OPAQUE_BACKGROUND; 8656 } 8657 8658 final int flags = mViewFlags; 8659 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 8660 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 8661 mPrivateFlags |= OPAQUE_SCROLLBARS; 8662 } else { 8663 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 8664 } 8665 } 8666 8667 /** 8668 * @hide 8669 */ 8670 protected boolean hasOpaqueScrollbars() { 8671 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 8672 } 8673 8674 /** 8675 * @return A handler associated with the thread running the View. This 8676 * handler can be used to pump events in the UI events queue. 8677 */ 8678 public Handler getHandler() { 8679 if (mAttachInfo != null) { 8680 return mAttachInfo.mHandler; 8681 } 8682 return null; 8683 } 8684 8685 /** 8686 * <p>Causes the Runnable to be added to the message queue. 8687 * The runnable will be run on the user interface thread.</p> 8688 * 8689 * <p>This method can be invoked from outside of the UI thread 8690 * only when this View is attached to a window.</p> 8691 * 8692 * @param action The Runnable that will be executed. 8693 * 8694 * @return Returns true if the Runnable was successfully placed in to the 8695 * message queue. Returns false on failure, usually because the 8696 * looper processing the message queue is exiting. 8697 */ 8698 public boolean post(Runnable action) { 8699 Handler handler; 8700 AttachInfo attachInfo = mAttachInfo; 8701 if (attachInfo != null) { 8702 handler = attachInfo.mHandler; 8703 } else { 8704 // Assume that post will succeed later 8705 ViewRootImpl.getRunQueue().post(action); 8706 return true; 8707 } 8708 8709 return handler.post(action); 8710 } 8711 8712 /** 8713 * <p>Causes the Runnable to be added to the message queue, to be run 8714 * after the specified amount of time elapses. 8715 * The runnable will be run on the user interface thread.</p> 8716 * 8717 * <p>This method can be invoked from outside of the UI thread 8718 * only when this View is attached to a window.</p> 8719 * 8720 * @param action The Runnable that will be executed. 8721 * @param delayMillis The delay (in milliseconds) until the Runnable 8722 * will be executed. 8723 * 8724 * @return true if the Runnable was successfully placed in to the 8725 * message queue. Returns false on failure, usually because the 8726 * looper processing the message queue is exiting. Note that a 8727 * result of true does not mean the Runnable will be processed -- 8728 * if the looper is quit before the delivery time of the message 8729 * occurs then the message will be dropped. 8730 */ 8731 public boolean postDelayed(Runnable action, long delayMillis) { 8732 Handler handler; 8733 AttachInfo attachInfo = mAttachInfo; 8734 if (attachInfo != null) { 8735 handler = attachInfo.mHandler; 8736 } else { 8737 // Assume that post will succeed later 8738 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 8739 return true; 8740 } 8741 8742 return handler.postDelayed(action, delayMillis); 8743 } 8744 8745 /** 8746 * <p>Removes the specified Runnable from the message queue.</p> 8747 * 8748 * <p>This method can be invoked from outside of the UI thread 8749 * only when this View is attached to a window.</p> 8750 * 8751 * @param action The Runnable to remove from the message handling queue 8752 * 8753 * @return true if this view could ask the Handler to remove the Runnable, 8754 * false otherwise. When the returned value is true, the Runnable 8755 * may or may not have been actually removed from the message queue 8756 * (for instance, if the Runnable was not in the queue already.) 8757 */ 8758 public boolean removeCallbacks(Runnable action) { 8759 Handler handler; 8760 AttachInfo attachInfo = mAttachInfo; 8761 if (attachInfo != null) { 8762 handler = attachInfo.mHandler; 8763 } else { 8764 // Assume that post will succeed later 8765 ViewRootImpl.getRunQueue().removeCallbacks(action); 8766 return true; 8767 } 8768 8769 handler.removeCallbacks(action); 8770 return true; 8771 } 8772 8773 /** 8774 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 8775 * Use this to invalidate the View from a non-UI thread.</p> 8776 * 8777 * <p>This method can be invoked from outside of the UI thread 8778 * only when this View is attached to a window.</p> 8779 * 8780 * @see #invalidate() 8781 */ 8782 public void postInvalidate() { 8783 postInvalidateDelayed(0); 8784 } 8785 8786 /** 8787 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8788 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 8789 * 8790 * <p>This method can be invoked from outside of the UI thread 8791 * only when this View is attached to a window.</p> 8792 * 8793 * @param left The left coordinate of the rectangle to invalidate. 8794 * @param top The top coordinate of the rectangle to invalidate. 8795 * @param right The right coordinate of the rectangle to invalidate. 8796 * @param bottom The bottom coordinate of the rectangle to invalidate. 8797 * 8798 * @see #invalidate(int, int, int, int) 8799 * @see #invalidate(Rect) 8800 */ 8801 public void postInvalidate(int left, int top, int right, int bottom) { 8802 postInvalidateDelayed(0, left, top, right, bottom); 8803 } 8804 8805 /** 8806 * <p>Cause an invalidate to happen on a subsequent cycle through the event 8807 * loop. Waits for the specified amount of time.</p> 8808 * 8809 * <p>This method can be invoked from outside of the UI thread 8810 * only when this View is attached to a window.</p> 8811 * 8812 * @param delayMilliseconds the duration in milliseconds to delay the 8813 * invalidation by 8814 */ 8815 public void postInvalidateDelayed(long delayMilliseconds) { 8816 // We try only with the AttachInfo because there's no point in invalidating 8817 // if we are not attached to our window 8818 AttachInfo attachInfo = mAttachInfo; 8819 if (attachInfo != null) { 8820 Message msg = Message.obtain(); 8821 msg.what = AttachInfo.INVALIDATE_MSG; 8822 msg.obj = this; 8823 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8824 } 8825 } 8826 8827 /** 8828 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8829 * through the event loop. Waits for the specified amount of time.</p> 8830 * 8831 * <p>This method can be invoked from outside of the UI thread 8832 * only when this View is attached to a window.</p> 8833 * 8834 * @param delayMilliseconds the duration in milliseconds to delay the 8835 * invalidation by 8836 * @param left The left coordinate of the rectangle to invalidate. 8837 * @param top The top coordinate of the rectangle to invalidate. 8838 * @param right The right coordinate of the rectangle to invalidate. 8839 * @param bottom The bottom coordinate of the rectangle to invalidate. 8840 */ 8841 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 8842 int right, int bottom) { 8843 8844 // We try only with the AttachInfo because there's no point in invalidating 8845 // if we are not attached to our window 8846 AttachInfo attachInfo = mAttachInfo; 8847 if (attachInfo != null) { 8848 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 8849 info.target = this; 8850 info.left = left; 8851 info.top = top; 8852 info.right = right; 8853 info.bottom = bottom; 8854 8855 final Message msg = Message.obtain(); 8856 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 8857 msg.obj = info; 8858 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8859 } 8860 } 8861 8862 /** 8863 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 8864 * This event is sent at most once every 8865 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 8866 */ 8867 private void postSendViewScrolledAccessibilityEventCallback() { 8868 if (mSendViewScrolledAccessibilityEvent == null) { 8869 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 8870 } 8871 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 8872 mSendViewScrolledAccessibilityEvent.mIsPending = true; 8873 postDelayed(mSendViewScrolledAccessibilityEvent, 8874 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 8875 } 8876 } 8877 8878 /** 8879 * Called by a parent to request that a child update its values for mScrollX 8880 * and mScrollY if necessary. This will typically be done if the child is 8881 * animating a scroll using a {@link android.widget.Scroller Scroller} 8882 * object. 8883 */ 8884 public void computeScroll() { 8885 } 8886 8887 /** 8888 * <p>Indicate whether the horizontal edges are faded when the view is 8889 * scrolled horizontally.</p> 8890 * 8891 * @return true if the horizontal edges should are faded on scroll, false 8892 * otherwise 8893 * 8894 * @see #setHorizontalFadingEdgeEnabled(boolean) 8895 * @attr ref android.R.styleable#View_requiresFadingEdge 8896 */ 8897 public boolean isHorizontalFadingEdgeEnabled() { 8898 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 8899 } 8900 8901 /** 8902 * <p>Define whether the horizontal edges should be faded when this view 8903 * is scrolled horizontally.</p> 8904 * 8905 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 8906 * be faded when the view is scrolled 8907 * horizontally 8908 * 8909 * @see #isHorizontalFadingEdgeEnabled() 8910 * @attr ref android.R.styleable#View_requiresFadingEdge 8911 */ 8912 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 8913 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 8914 if (horizontalFadingEdgeEnabled) { 8915 initScrollCache(); 8916 } 8917 8918 mViewFlags ^= FADING_EDGE_HORIZONTAL; 8919 } 8920 } 8921 8922 /** 8923 * <p>Indicate whether the vertical edges are faded when the view is 8924 * scrolled horizontally.</p> 8925 * 8926 * @return true if the vertical edges should are faded on scroll, false 8927 * otherwise 8928 * 8929 * @see #setVerticalFadingEdgeEnabled(boolean) 8930 * @attr ref android.R.styleable#View_requiresFadingEdge 8931 */ 8932 public boolean isVerticalFadingEdgeEnabled() { 8933 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 8934 } 8935 8936 /** 8937 * <p>Define whether the vertical edges should be faded when this view 8938 * is scrolled vertically.</p> 8939 * 8940 * @param verticalFadingEdgeEnabled true if the vertical edges should 8941 * be faded when the view is scrolled 8942 * vertically 8943 * 8944 * @see #isVerticalFadingEdgeEnabled() 8945 * @attr ref android.R.styleable#View_requiresFadingEdge 8946 */ 8947 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 8948 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 8949 if (verticalFadingEdgeEnabled) { 8950 initScrollCache(); 8951 } 8952 8953 mViewFlags ^= FADING_EDGE_VERTICAL; 8954 } 8955 } 8956 8957 /** 8958 * Returns the strength, or intensity, of the top faded edge. The strength is 8959 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8960 * returns 0.0 or 1.0 but no value in between. 8961 * 8962 * Subclasses should override this method to provide a smoother fade transition 8963 * when scrolling occurs. 8964 * 8965 * @return the intensity of the top fade as a float between 0.0f and 1.0f 8966 */ 8967 protected float getTopFadingEdgeStrength() { 8968 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 8969 } 8970 8971 /** 8972 * Returns the strength, or intensity, of the bottom faded edge. The strength is 8973 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8974 * returns 0.0 or 1.0 but no value in between. 8975 * 8976 * Subclasses should override this method to provide a smoother fade transition 8977 * when scrolling occurs. 8978 * 8979 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 8980 */ 8981 protected float getBottomFadingEdgeStrength() { 8982 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 8983 computeVerticalScrollRange() ? 1.0f : 0.0f; 8984 } 8985 8986 /** 8987 * Returns the strength, or intensity, of the left faded edge. The strength is 8988 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8989 * returns 0.0 or 1.0 but no value in between. 8990 * 8991 * Subclasses should override this method to provide a smoother fade transition 8992 * when scrolling occurs. 8993 * 8994 * @return the intensity of the left fade as a float between 0.0f and 1.0f 8995 */ 8996 protected float getLeftFadingEdgeStrength() { 8997 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 8998 } 8999 9000 /** 9001 * Returns the strength, or intensity, of the right faded edge. The strength is 9002 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 9003 * returns 0.0 or 1.0 but no value in between. 9004 * 9005 * Subclasses should override this method to provide a smoother fade transition 9006 * when scrolling occurs. 9007 * 9008 * @return the intensity of the right fade as a float between 0.0f and 1.0f 9009 */ 9010 protected float getRightFadingEdgeStrength() { 9011 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 9012 computeHorizontalScrollRange() ? 1.0f : 0.0f; 9013 } 9014 9015 /** 9016 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 9017 * scrollbar is not drawn by default.</p> 9018 * 9019 * @return true if the horizontal scrollbar should be painted, false 9020 * otherwise 9021 * 9022 * @see #setHorizontalScrollBarEnabled(boolean) 9023 */ 9024 public boolean isHorizontalScrollBarEnabled() { 9025 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9026 } 9027 9028 /** 9029 * <p>Define whether the horizontal scrollbar should be drawn or not. The 9030 * scrollbar is not drawn by default.</p> 9031 * 9032 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 9033 * be painted 9034 * 9035 * @see #isHorizontalScrollBarEnabled() 9036 */ 9037 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 9038 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 9039 mViewFlags ^= SCROLLBARS_HORIZONTAL; 9040 computeOpaqueFlags(); 9041 resolvePadding(); 9042 } 9043 } 9044 9045 /** 9046 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 9047 * scrollbar is not drawn by default.</p> 9048 * 9049 * @return true if the vertical scrollbar should be painted, false 9050 * otherwise 9051 * 9052 * @see #setVerticalScrollBarEnabled(boolean) 9053 */ 9054 public boolean isVerticalScrollBarEnabled() { 9055 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 9056 } 9057 9058 /** 9059 * <p>Define whether the vertical scrollbar should be drawn or not. The 9060 * scrollbar is not drawn by default.</p> 9061 * 9062 * @param verticalScrollBarEnabled true if the vertical scrollbar should 9063 * be painted 9064 * 9065 * @see #isVerticalScrollBarEnabled() 9066 */ 9067 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 9068 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 9069 mViewFlags ^= SCROLLBARS_VERTICAL; 9070 computeOpaqueFlags(); 9071 resolvePadding(); 9072 } 9073 } 9074 9075 /** 9076 * @hide 9077 */ 9078 protected void recomputePadding() { 9079 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 9080 } 9081 9082 /** 9083 * Define whether scrollbars will fade when the view is not scrolling. 9084 * 9085 * @param fadeScrollbars wheter to enable fading 9086 * 9087 */ 9088 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 9089 initScrollCache(); 9090 final ScrollabilityCache scrollabilityCache = mScrollCache; 9091 scrollabilityCache.fadeScrollBars = fadeScrollbars; 9092 if (fadeScrollbars) { 9093 scrollabilityCache.state = ScrollabilityCache.OFF; 9094 } else { 9095 scrollabilityCache.state = ScrollabilityCache.ON; 9096 } 9097 } 9098 9099 /** 9100 * 9101 * Returns true if scrollbars will fade when this view is not scrolling 9102 * 9103 * @return true if scrollbar fading is enabled 9104 */ 9105 public boolean isScrollbarFadingEnabled() { 9106 return mScrollCache != null && mScrollCache.fadeScrollBars; 9107 } 9108 9109 /** 9110 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 9111 * inset. When inset, they add to the padding of the view. And the scrollbars 9112 * can be drawn inside the padding area or on the edge of the view. For example, 9113 * if a view has a background drawable and you want to draw the scrollbars 9114 * inside the padding specified by the drawable, you can use 9115 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 9116 * appear at the edge of the view, ignoring the padding, then you can use 9117 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 9118 * @param style the style of the scrollbars. Should be one of 9119 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 9120 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 9121 * @see #SCROLLBARS_INSIDE_OVERLAY 9122 * @see #SCROLLBARS_INSIDE_INSET 9123 * @see #SCROLLBARS_OUTSIDE_OVERLAY 9124 * @see #SCROLLBARS_OUTSIDE_INSET 9125 */ 9126 public void setScrollBarStyle(int style) { 9127 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 9128 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 9129 computeOpaqueFlags(); 9130 resolvePadding(); 9131 } 9132 } 9133 9134 /** 9135 * <p>Returns the current scrollbar style.</p> 9136 * @return the current scrollbar style 9137 * @see #SCROLLBARS_INSIDE_OVERLAY 9138 * @see #SCROLLBARS_INSIDE_INSET 9139 * @see #SCROLLBARS_OUTSIDE_OVERLAY 9140 * @see #SCROLLBARS_OUTSIDE_INSET 9141 */ 9142 @ViewDebug.ExportedProperty(mapping = { 9143 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 9144 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 9145 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 9146 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 9147 }) 9148 public int getScrollBarStyle() { 9149 return mViewFlags & SCROLLBARS_STYLE_MASK; 9150 } 9151 9152 /** 9153 * <p>Compute the horizontal range that the horizontal scrollbar 9154 * represents.</p> 9155 * 9156 * <p>The range is expressed in arbitrary units that must be the same as the 9157 * units used by {@link #computeHorizontalScrollExtent()} and 9158 * {@link #computeHorizontalScrollOffset()}.</p> 9159 * 9160 * <p>The default range is the drawing width of this view.</p> 9161 * 9162 * @return the total horizontal range represented by the horizontal 9163 * scrollbar 9164 * 9165 * @see #computeHorizontalScrollExtent() 9166 * @see #computeHorizontalScrollOffset() 9167 * @see android.widget.ScrollBarDrawable 9168 */ 9169 protected int computeHorizontalScrollRange() { 9170 return getWidth(); 9171 } 9172 9173 /** 9174 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 9175 * within the horizontal range. This value is used to compute the position 9176 * of the thumb within the scrollbar's track.</p> 9177 * 9178 * <p>The range is expressed in arbitrary units that must be the same as the 9179 * units used by {@link #computeHorizontalScrollRange()} and 9180 * {@link #computeHorizontalScrollExtent()}.</p> 9181 * 9182 * <p>The default offset is the scroll offset of this view.</p> 9183 * 9184 * @return the horizontal offset of the scrollbar's thumb 9185 * 9186 * @see #computeHorizontalScrollRange() 9187 * @see #computeHorizontalScrollExtent() 9188 * @see android.widget.ScrollBarDrawable 9189 */ 9190 protected int computeHorizontalScrollOffset() { 9191 return mScrollX; 9192 } 9193 9194 /** 9195 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 9196 * within the horizontal range. This value is used to compute the length 9197 * of the thumb within the scrollbar's track.</p> 9198 * 9199 * <p>The range is expressed in arbitrary units that must be the same as the 9200 * units used by {@link #computeHorizontalScrollRange()} and 9201 * {@link #computeHorizontalScrollOffset()}.</p> 9202 * 9203 * <p>The default extent is the drawing width of this view.</p> 9204 * 9205 * @return the horizontal extent of the scrollbar's thumb 9206 * 9207 * @see #computeHorizontalScrollRange() 9208 * @see #computeHorizontalScrollOffset() 9209 * @see android.widget.ScrollBarDrawable 9210 */ 9211 protected int computeHorizontalScrollExtent() { 9212 return getWidth(); 9213 } 9214 9215 /** 9216 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 9217 * 9218 * <p>The range is expressed in arbitrary units that must be the same as the 9219 * units used by {@link #computeVerticalScrollExtent()} and 9220 * {@link #computeVerticalScrollOffset()}.</p> 9221 * 9222 * @return the total vertical range represented by the vertical scrollbar 9223 * 9224 * <p>The default range is the drawing height of this view.</p> 9225 * 9226 * @see #computeVerticalScrollExtent() 9227 * @see #computeVerticalScrollOffset() 9228 * @see android.widget.ScrollBarDrawable 9229 */ 9230 protected int computeVerticalScrollRange() { 9231 return getHeight(); 9232 } 9233 9234 /** 9235 * <p>Compute the vertical offset of the vertical scrollbar's thumb 9236 * within the horizontal range. This value is used to compute the position 9237 * of the thumb within the scrollbar's track.</p> 9238 * 9239 * <p>The range is expressed in arbitrary units that must be the same as the 9240 * units used by {@link #computeVerticalScrollRange()} and 9241 * {@link #computeVerticalScrollExtent()}.</p> 9242 * 9243 * <p>The default offset is the scroll offset of this view.</p> 9244 * 9245 * @return the vertical offset of the scrollbar's thumb 9246 * 9247 * @see #computeVerticalScrollRange() 9248 * @see #computeVerticalScrollExtent() 9249 * @see android.widget.ScrollBarDrawable 9250 */ 9251 protected int computeVerticalScrollOffset() { 9252 return mScrollY; 9253 } 9254 9255 /** 9256 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 9257 * within the vertical range. This value is used to compute the length 9258 * of the thumb within the scrollbar's track.</p> 9259 * 9260 * <p>The range is expressed in arbitrary units that must be the same as the 9261 * units used by {@link #computeVerticalScrollRange()} and 9262 * {@link #computeVerticalScrollOffset()}.</p> 9263 * 9264 * <p>The default extent is the drawing height of this view.</p> 9265 * 9266 * @return the vertical extent of the scrollbar's thumb 9267 * 9268 * @see #computeVerticalScrollRange() 9269 * @see #computeVerticalScrollOffset() 9270 * @see android.widget.ScrollBarDrawable 9271 */ 9272 protected int computeVerticalScrollExtent() { 9273 return getHeight(); 9274 } 9275 9276 /** 9277 * Check if this view can be scrolled horizontally in a certain direction. 9278 * 9279 * @param direction Negative to check scrolling left, positive to check scrolling right. 9280 * @return true if this view can be scrolled in the specified direction, false otherwise. 9281 */ 9282 public boolean canScrollHorizontally(int direction) { 9283 final int offset = computeHorizontalScrollOffset(); 9284 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 9285 if (range == 0) return false; 9286 if (direction < 0) { 9287 return offset > 0; 9288 } else { 9289 return offset < range - 1; 9290 } 9291 } 9292 9293 /** 9294 * Check if this view can be scrolled vertically in a certain direction. 9295 * 9296 * @param direction Negative to check scrolling up, positive to check scrolling down. 9297 * @return true if this view can be scrolled in the specified direction, false otherwise. 9298 */ 9299 public boolean canScrollVertically(int direction) { 9300 final int offset = computeVerticalScrollOffset(); 9301 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 9302 if (range == 0) return false; 9303 if (direction < 0) { 9304 return offset > 0; 9305 } else { 9306 return offset < range - 1; 9307 } 9308 } 9309 9310 /** 9311 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 9312 * scrollbars are painted only if they have been awakened first.</p> 9313 * 9314 * @param canvas the canvas on which to draw the scrollbars 9315 * 9316 * @see #awakenScrollBars(int) 9317 */ 9318 protected final void onDrawScrollBars(Canvas canvas) { 9319 // scrollbars are drawn only when the animation is running 9320 final ScrollabilityCache cache = mScrollCache; 9321 if (cache != null) { 9322 9323 int state = cache.state; 9324 9325 if (state == ScrollabilityCache.OFF) { 9326 return; 9327 } 9328 9329 boolean invalidate = false; 9330 9331 if (state == ScrollabilityCache.FADING) { 9332 // We're fading -- get our fade interpolation 9333 if (cache.interpolatorValues == null) { 9334 cache.interpolatorValues = new float[1]; 9335 } 9336 9337 float[] values = cache.interpolatorValues; 9338 9339 // Stops the animation if we're done 9340 if (cache.scrollBarInterpolator.timeToValues(values) == 9341 Interpolator.Result.FREEZE_END) { 9342 cache.state = ScrollabilityCache.OFF; 9343 } else { 9344 cache.scrollBar.setAlpha(Math.round(values[0])); 9345 } 9346 9347 // This will make the scroll bars inval themselves after 9348 // drawing. We only want this when we're fading so that 9349 // we prevent excessive redraws 9350 invalidate = true; 9351 } else { 9352 // We're just on -- but we may have been fading before so 9353 // reset alpha 9354 cache.scrollBar.setAlpha(255); 9355 } 9356 9357 9358 final int viewFlags = mViewFlags; 9359 9360 final boolean drawHorizontalScrollBar = 9361 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9362 final boolean drawVerticalScrollBar = 9363 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 9364 && !isVerticalScrollBarHidden(); 9365 9366 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 9367 final int width = mRight - mLeft; 9368 final int height = mBottom - mTop; 9369 9370 final ScrollBarDrawable scrollBar = cache.scrollBar; 9371 9372 final int scrollX = mScrollX; 9373 final int scrollY = mScrollY; 9374 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 9375 9376 int left, top, right, bottom; 9377 9378 if (drawHorizontalScrollBar) { 9379 int size = scrollBar.getSize(false); 9380 if (size <= 0) { 9381 size = cache.scrollBarSize; 9382 } 9383 9384 scrollBar.setParameters(computeHorizontalScrollRange(), 9385 computeHorizontalScrollOffset(), 9386 computeHorizontalScrollExtent(), false); 9387 final int verticalScrollBarGap = drawVerticalScrollBar ? 9388 getVerticalScrollbarWidth() : 0; 9389 top = scrollY + height - size - (mUserPaddingBottom & inside); 9390 left = scrollX + (mPaddingLeft & inside); 9391 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 9392 bottom = top + size; 9393 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 9394 if (invalidate) { 9395 invalidate(left, top, right, bottom); 9396 } 9397 } 9398 9399 if (drawVerticalScrollBar) { 9400 int size = scrollBar.getSize(true); 9401 if (size <= 0) { 9402 size = cache.scrollBarSize; 9403 } 9404 9405 scrollBar.setParameters(computeVerticalScrollRange(), 9406 computeVerticalScrollOffset(), 9407 computeVerticalScrollExtent(), true); 9408 switch (mVerticalScrollbarPosition) { 9409 default: 9410 case SCROLLBAR_POSITION_DEFAULT: 9411 case SCROLLBAR_POSITION_RIGHT: 9412 left = scrollX + width - size - (mUserPaddingRight & inside); 9413 break; 9414 case SCROLLBAR_POSITION_LEFT: 9415 left = scrollX + (mUserPaddingLeft & inside); 9416 break; 9417 } 9418 top = scrollY + (mPaddingTop & inside); 9419 right = left + size; 9420 bottom = scrollY + height - (mUserPaddingBottom & inside); 9421 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 9422 if (invalidate) { 9423 invalidate(left, top, right, bottom); 9424 } 9425 } 9426 } 9427 } 9428 } 9429 9430 /** 9431 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 9432 * FastScroller is visible. 9433 * @return whether to temporarily hide the vertical scrollbar 9434 * @hide 9435 */ 9436 protected boolean isVerticalScrollBarHidden() { 9437 return false; 9438 } 9439 9440 /** 9441 * <p>Draw the horizontal scrollbar if 9442 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 9443 * 9444 * @param canvas the canvas on which to draw the scrollbar 9445 * @param scrollBar the scrollbar's drawable 9446 * 9447 * @see #isHorizontalScrollBarEnabled() 9448 * @see #computeHorizontalScrollRange() 9449 * @see #computeHorizontalScrollExtent() 9450 * @see #computeHorizontalScrollOffset() 9451 * @see android.widget.ScrollBarDrawable 9452 * @hide 9453 */ 9454 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 9455 int l, int t, int r, int b) { 9456 scrollBar.setBounds(l, t, r, b); 9457 scrollBar.draw(canvas); 9458 } 9459 9460 /** 9461 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 9462 * returns true.</p> 9463 * 9464 * @param canvas the canvas on which to draw the scrollbar 9465 * @param scrollBar the scrollbar's drawable 9466 * 9467 * @see #isVerticalScrollBarEnabled() 9468 * @see #computeVerticalScrollRange() 9469 * @see #computeVerticalScrollExtent() 9470 * @see #computeVerticalScrollOffset() 9471 * @see android.widget.ScrollBarDrawable 9472 * @hide 9473 */ 9474 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 9475 int l, int t, int r, int b) { 9476 scrollBar.setBounds(l, t, r, b); 9477 scrollBar.draw(canvas); 9478 } 9479 9480 /** 9481 * Implement this to do your drawing. 9482 * 9483 * @param canvas the canvas on which the background will be drawn 9484 */ 9485 protected void onDraw(Canvas canvas) { 9486 } 9487 9488 /* 9489 * Caller is responsible for calling requestLayout if necessary. 9490 * (This allows addViewInLayout to not request a new layout.) 9491 */ 9492 void assignParent(ViewParent parent) { 9493 if (mParent == null) { 9494 mParent = parent; 9495 } else if (parent == null) { 9496 mParent = null; 9497 } else { 9498 throw new RuntimeException("view " + this + " being added, but" 9499 + " it already has a parent"); 9500 } 9501 } 9502 9503 /** 9504 * This is called when the view is attached to a window. At this point it 9505 * has a Surface and will start drawing. Note that this function is 9506 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 9507 * however it may be called any time before the first onDraw -- including 9508 * before or after {@link #onMeasure(int, int)}. 9509 * 9510 * @see #onDetachedFromWindow() 9511 */ 9512 protected void onAttachedToWindow() { 9513 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 9514 mParent.requestTransparentRegion(this); 9515 } 9516 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 9517 initialAwakenScrollBars(); 9518 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 9519 } 9520 jumpDrawablesToCurrentState(); 9521 // Order is important here: LayoutDirection MUST be resolved before Padding 9522 // and TextDirection 9523 resolveLayoutDirectionIfNeeded(); 9524 resolvePadding(); 9525 resolveTextDirection(); 9526 if (isFocused()) { 9527 InputMethodManager imm = InputMethodManager.peekInstance(); 9528 imm.focusIn(this); 9529 } 9530 } 9531 9532 /** 9533 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 9534 * that the parent directionality can and will be resolved before its children. 9535 */ 9536 private void resolveLayoutDirectionIfNeeded() { 9537 // Do not resolve if it is not needed 9538 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) == LAYOUT_DIRECTION_RESOLVED) return; 9539 9540 // Clear any previous layout direction resolution 9541 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_RTL; 9542 9543 // Reset also TextDirection as a change into LayoutDirection may impact the selected 9544 // TextDirectionHeuristic 9545 resetResolvedTextDirection(); 9546 9547 // Set resolved depending on layout direction 9548 switch (getLayoutDirection()) { 9549 case LAYOUT_DIRECTION_INHERIT: 9550 // We cannot do the resolution if there is no parent 9551 if (mParent == null) return; 9552 9553 // If this is root view, no need to look at parent's layout dir. 9554 if (mParent instanceof ViewGroup) { 9555 ViewGroup viewGroup = ((ViewGroup) mParent); 9556 9557 // Check if the parent view group can resolve 9558 if (! viewGroup.canResolveLayoutDirection()) { 9559 return; 9560 } 9561 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 9562 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9563 } 9564 } 9565 break; 9566 case LAYOUT_DIRECTION_RTL: 9567 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9568 break; 9569 case LAYOUT_DIRECTION_LOCALE: 9570 if(isLayoutDirectionRtl(Locale.getDefault())) { 9571 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9572 } 9573 break; 9574 default: 9575 // Nothing to do, LTR by default 9576 } 9577 9578 // Set to resolved 9579 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 9580 } 9581 9582 /** 9583 * @hide 9584 */ 9585 protected void resolvePadding() { 9586 // If the user specified the absolute padding (either with android:padding or 9587 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 9588 // use the default padding or the padding from the background drawable 9589 // (stored at this point in mPadding*) 9590 switch (getResolvedLayoutDirection()) { 9591 case LAYOUT_DIRECTION_RTL: 9592 // Start user padding override Right user padding. Otherwise, if Right user 9593 // padding is not defined, use the default Right padding. If Right user padding 9594 // is defined, just use it. 9595 if (mUserPaddingStart >= 0) { 9596 mUserPaddingRight = mUserPaddingStart; 9597 } else if (mUserPaddingRight < 0) { 9598 mUserPaddingRight = mPaddingRight; 9599 } 9600 if (mUserPaddingEnd >= 0) { 9601 mUserPaddingLeft = mUserPaddingEnd; 9602 } else if (mUserPaddingLeft < 0) { 9603 mUserPaddingLeft = mPaddingLeft; 9604 } 9605 break; 9606 case LAYOUT_DIRECTION_LTR: 9607 default: 9608 // Start user padding override Left user padding. Otherwise, if Left user 9609 // padding is not defined, use the default left padding. If Left user padding 9610 // is defined, just use it. 9611 if (mUserPaddingStart >= 0) { 9612 mUserPaddingLeft = mUserPaddingStart; 9613 } else if (mUserPaddingLeft < 0) { 9614 mUserPaddingLeft = mPaddingLeft; 9615 } 9616 if (mUserPaddingEnd >= 0) { 9617 mUserPaddingRight = mUserPaddingEnd; 9618 } else if (mUserPaddingRight < 0) { 9619 mUserPaddingRight = mPaddingRight; 9620 } 9621 } 9622 9623 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 9624 9625 recomputePadding(); 9626 } 9627 9628 /** 9629 * Return true if layout direction resolution can be done 9630 * 9631 * @hide 9632 */ 9633 protected boolean canResolveLayoutDirection() { 9634 switch (getLayoutDirection()) { 9635 case LAYOUT_DIRECTION_INHERIT: 9636 return (mParent != null); 9637 default: 9638 return true; 9639 } 9640 } 9641 9642 /** 9643 * Reset the resolved layout direction. 9644 * 9645 * Subclasses need to override this method to clear cached information that depends on the 9646 * resolved layout direction, or to inform child views that inherit their layout direction. 9647 * Overrides must also call the superclass implementation at the start of their implementation. 9648 * 9649 * @hide 9650 */ 9651 protected void resetResolvedLayoutDirection() { 9652 // Reset the current View resolution 9653 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED; 9654 } 9655 9656 /** 9657 * Check if a Locale is corresponding to a RTL script. 9658 * 9659 * @param locale Locale to check 9660 * @return true if a Locale is corresponding to a RTL script. 9661 * 9662 * @hide 9663 */ 9664 protected static boolean isLayoutDirectionRtl(Locale locale) { 9665 return (LocaleUtil.TEXT_LAYOUT_DIRECTION_RTL_DO_NOT_USE == 9666 LocaleUtil.getLayoutDirectionFromLocale(locale)); 9667 } 9668 9669 /** 9670 * This is called when the view is detached from a window. At this point it 9671 * no longer has a surface for drawing. 9672 * 9673 * @see #onAttachedToWindow() 9674 */ 9675 protected void onDetachedFromWindow() { 9676 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 9677 9678 removeUnsetPressCallback(); 9679 removeLongPressCallback(); 9680 removePerformClickCallback(); 9681 removeSendViewScrolledAccessibilityEventCallback(); 9682 9683 destroyDrawingCache(); 9684 9685 destroyLayer(); 9686 9687 if (mDisplayList != null) { 9688 mDisplayList.invalidate(); 9689 } 9690 9691 if (mAttachInfo != null) { 9692 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 9693 } 9694 9695 mCurrentAnimation = null; 9696 9697 resetResolvedLayoutDirection(); 9698 resetResolvedTextDirection(); 9699 } 9700 9701 /** 9702 * @return The number of times this view has been attached to a window 9703 */ 9704 protected int getWindowAttachCount() { 9705 return mWindowAttachCount; 9706 } 9707 9708 /** 9709 * Retrieve a unique token identifying the window this view is attached to. 9710 * @return Return the window's token for use in 9711 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 9712 */ 9713 public IBinder getWindowToken() { 9714 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 9715 } 9716 9717 /** 9718 * Retrieve a unique token identifying the top-level "real" window of 9719 * the window that this view is attached to. That is, this is like 9720 * {@link #getWindowToken}, except if the window this view in is a panel 9721 * window (attached to another containing window), then the token of 9722 * the containing window is returned instead. 9723 * 9724 * @return Returns the associated window token, either 9725 * {@link #getWindowToken()} or the containing window's token. 9726 */ 9727 public IBinder getApplicationWindowToken() { 9728 AttachInfo ai = mAttachInfo; 9729 if (ai != null) { 9730 IBinder appWindowToken = ai.mPanelParentWindowToken; 9731 if (appWindowToken == null) { 9732 appWindowToken = ai.mWindowToken; 9733 } 9734 return appWindowToken; 9735 } 9736 return null; 9737 } 9738 9739 /** 9740 * Retrieve private session object this view hierarchy is using to 9741 * communicate with the window manager. 9742 * @return the session object to communicate with the window manager 9743 */ 9744 /*package*/ IWindowSession getWindowSession() { 9745 return mAttachInfo != null ? mAttachInfo.mSession : null; 9746 } 9747 9748 /** 9749 * @param info the {@link android.view.View.AttachInfo} to associated with 9750 * this view 9751 */ 9752 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 9753 //System.out.println("Attached! " + this); 9754 mAttachInfo = info; 9755 mWindowAttachCount++; 9756 // We will need to evaluate the drawable state at least once. 9757 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9758 if (mFloatingTreeObserver != null) { 9759 info.mTreeObserver.merge(mFloatingTreeObserver); 9760 mFloatingTreeObserver = null; 9761 } 9762 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 9763 mAttachInfo.mScrollContainers.add(this); 9764 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 9765 } 9766 performCollectViewAttributes(visibility); 9767 onAttachedToWindow(); 9768 9769 ListenerInfo li = mListenerInfo; 9770 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9771 li != null ? li.mOnAttachStateChangeListeners : null; 9772 if (listeners != null && listeners.size() > 0) { 9773 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9774 // perform the dispatching. The iterator is a safe guard against listeners that 9775 // could mutate the list by calling the various add/remove methods. This prevents 9776 // the array from being modified while we iterate it. 9777 for (OnAttachStateChangeListener listener : listeners) { 9778 listener.onViewAttachedToWindow(this); 9779 } 9780 } 9781 9782 int vis = info.mWindowVisibility; 9783 if (vis != GONE) { 9784 onWindowVisibilityChanged(vis); 9785 } 9786 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 9787 // If nobody has evaluated the drawable state yet, then do it now. 9788 refreshDrawableState(); 9789 } 9790 } 9791 9792 void dispatchDetachedFromWindow() { 9793 AttachInfo info = mAttachInfo; 9794 if (info != null) { 9795 int vis = info.mWindowVisibility; 9796 if (vis != GONE) { 9797 onWindowVisibilityChanged(GONE); 9798 } 9799 } 9800 9801 onDetachedFromWindow(); 9802 9803 ListenerInfo li = mListenerInfo; 9804 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9805 li != null ? li.mOnAttachStateChangeListeners : null; 9806 if (listeners != null && listeners.size() > 0) { 9807 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9808 // perform the dispatching. The iterator is a safe guard against listeners that 9809 // could mutate the list by calling the various add/remove methods. This prevents 9810 // the array from being modified while we iterate it. 9811 for (OnAttachStateChangeListener listener : listeners) { 9812 listener.onViewDetachedFromWindow(this); 9813 } 9814 } 9815 9816 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 9817 mAttachInfo.mScrollContainers.remove(this); 9818 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 9819 } 9820 9821 mAttachInfo = null; 9822 } 9823 9824 /** 9825 * Store this view hierarchy's frozen state into the given container. 9826 * 9827 * @param container The SparseArray in which to save the view's state. 9828 * 9829 * @see #restoreHierarchyState(android.util.SparseArray) 9830 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9831 * @see #onSaveInstanceState() 9832 */ 9833 public void saveHierarchyState(SparseArray<Parcelable> container) { 9834 dispatchSaveInstanceState(container); 9835 } 9836 9837 /** 9838 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 9839 * this view and its children. May be overridden to modify how freezing happens to a 9840 * view's children; for example, some views may want to not store state for their children. 9841 * 9842 * @param container The SparseArray in which to save the view's state. 9843 * 9844 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9845 * @see #saveHierarchyState(android.util.SparseArray) 9846 * @see #onSaveInstanceState() 9847 */ 9848 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 9849 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 9850 mPrivateFlags &= ~SAVE_STATE_CALLED; 9851 Parcelable state = onSaveInstanceState(); 9852 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9853 throw new IllegalStateException( 9854 "Derived class did not call super.onSaveInstanceState()"); 9855 } 9856 if (state != null) { 9857 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 9858 // + ": " + state); 9859 container.put(mID, state); 9860 } 9861 } 9862 } 9863 9864 /** 9865 * Hook allowing a view to generate a representation of its internal state 9866 * that can later be used to create a new instance with that same state. 9867 * This state should only contain information that is not persistent or can 9868 * not be reconstructed later. For example, you will never store your 9869 * current position on screen because that will be computed again when a 9870 * new instance of the view is placed in its view hierarchy. 9871 * <p> 9872 * Some examples of things you may store here: the current cursor position 9873 * in a text view (but usually not the text itself since that is stored in a 9874 * content provider or other persistent storage), the currently selected 9875 * item in a list view. 9876 * 9877 * @return Returns a Parcelable object containing the view's current dynamic 9878 * state, or null if there is nothing interesting to save. The 9879 * default implementation returns null. 9880 * @see #onRestoreInstanceState(android.os.Parcelable) 9881 * @see #saveHierarchyState(android.util.SparseArray) 9882 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9883 * @see #setSaveEnabled(boolean) 9884 */ 9885 protected Parcelable onSaveInstanceState() { 9886 mPrivateFlags |= SAVE_STATE_CALLED; 9887 return BaseSavedState.EMPTY_STATE; 9888 } 9889 9890 /** 9891 * Restore this view hierarchy's frozen state from the given container. 9892 * 9893 * @param container The SparseArray which holds previously frozen states. 9894 * 9895 * @see #saveHierarchyState(android.util.SparseArray) 9896 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9897 * @see #onRestoreInstanceState(android.os.Parcelable) 9898 */ 9899 public void restoreHierarchyState(SparseArray<Parcelable> container) { 9900 dispatchRestoreInstanceState(container); 9901 } 9902 9903 /** 9904 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 9905 * state for this view and its children. May be overridden to modify how restoring 9906 * happens to a view's children; for example, some views may want to not store state 9907 * for their children. 9908 * 9909 * @param container The SparseArray which holds previously saved state. 9910 * 9911 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9912 * @see #restoreHierarchyState(android.util.SparseArray) 9913 * @see #onRestoreInstanceState(android.os.Parcelable) 9914 */ 9915 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 9916 if (mID != NO_ID) { 9917 Parcelable state = container.get(mID); 9918 if (state != null) { 9919 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 9920 // + ": " + state); 9921 mPrivateFlags &= ~SAVE_STATE_CALLED; 9922 onRestoreInstanceState(state); 9923 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9924 throw new IllegalStateException( 9925 "Derived class did not call super.onRestoreInstanceState()"); 9926 } 9927 } 9928 } 9929 } 9930 9931 /** 9932 * Hook allowing a view to re-apply a representation of its internal state that had previously 9933 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 9934 * null state. 9935 * 9936 * @param state The frozen state that had previously been returned by 9937 * {@link #onSaveInstanceState}. 9938 * 9939 * @see #onSaveInstanceState() 9940 * @see #restoreHierarchyState(android.util.SparseArray) 9941 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9942 */ 9943 protected void onRestoreInstanceState(Parcelable state) { 9944 mPrivateFlags |= SAVE_STATE_CALLED; 9945 if (state != BaseSavedState.EMPTY_STATE && state != null) { 9946 throw new IllegalArgumentException("Wrong state class, expecting View State but " 9947 + "received " + state.getClass().toString() + " instead. This usually happens " 9948 + "when two views of different type have the same id in the same hierarchy. " 9949 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 9950 + "other views do not use the same id."); 9951 } 9952 } 9953 9954 /** 9955 * <p>Return the time at which the drawing of the view hierarchy started.</p> 9956 * 9957 * @return the drawing start time in milliseconds 9958 */ 9959 public long getDrawingTime() { 9960 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 9961 } 9962 9963 /** 9964 * <p>Enables or disables the duplication of the parent's state into this view. When 9965 * duplication is enabled, this view gets its drawable state from its parent rather 9966 * than from its own internal properties.</p> 9967 * 9968 * <p>Note: in the current implementation, setting this property to true after the 9969 * view was added to a ViewGroup might have no effect at all. This property should 9970 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 9971 * 9972 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 9973 * property is enabled, an exception will be thrown.</p> 9974 * 9975 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 9976 * parent, these states should not be affected by this method.</p> 9977 * 9978 * @param enabled True to enable duplication of the parent's drawable state, false 9979 * to disable it. 9980 * 9981 * @see #getDrawableState() 9982 * @see #isDuplicateParentStateEnabled() 9983 */ 9984 public void setDuplicateParentStateEnabled(boolean enabled) { 9985 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 9986 } 9987 9988 /** 9989 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 9990 * 9991 * @return True if this view's drawable state is duplicated from the parent, 9992 * false otherwise 9993 * 9994 * @see #getDrawableState() 9995 * @see #setDuplicateParentStateEnabled(boolean) 9996 */ 9997 public boolean isDuplicateParentStateEnabled() { 9998 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 9999 } 10000 10001 /** 10002 * <p>Specifies the type of layer backing this view. The layer can be 10003 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 10004 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 10005 * 10006 * <p>A layer is associated with an optional {@link android.graphics.Paint} 10007 * instance that controls how the layer is composed on screen. The following 10008 * properties of the paint are taken into account when composing the layer:</p> 10009 * <ul> 10010 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 10011 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 10012 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 10013 * </ul> 10014 * 10015 * <p>If this view has an alpha value set to < 1.0 by calling 10016 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 10017 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 10018 * equivalent to setting a hardware layer on this view and providing a paint with 10019 * the desired alpha value.<p> 10020 * 10021 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 10022 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 10023 * for more information on when and how to use layers.</p> 10024 * 10025 * @param layerType The ype of layer to use with this view, must be one of 10026 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 10027 * {@link #LAYER_TYPE_HARDWARE} 10028 * @param paint The paint used to compose the layer. This argument is optional 10029 * and can be null. It is ignored when the layer type is 10030 * {@link #LAYER_TYPE_NONE} 10031 * 10032 * @see #getLayerType() 10033 * @see #LAYER_TYPE_NONE 10034 * @see #LAYER_TYPE_SOFTWARE 10035 * @see #LAYER_TYPE_HARDWARE 10036 * @see #setAlpha(float) 10037 * 10038 * @attr ref android.R.styleable#View_layerType 10039 */ 10040 public void setLayerType(int layerType, Paint paint) { 10041 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 10042 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 10043 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 10044 } 10045 10046 if (layerType == mLayerType) { 10047 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 10048 mLayerPaint = paint == null ? new Paint() : paint; 10049 invalidateParentCaches(); 10050 invalidate(true); 10051 } 10052 return; 10053 } 10054 10055 // Destroy any previous software drawing cache if needed 10056 switch (mLayerType) { 10057 case LAYER_TYPE_HARDWARE: 10058 destroyLayer(); 10059 // fall through - non-accelerated views may use software layer mechanism instead 10060 case LAYER_TYPE_SOFTWARE: 10061 destroyDrawingCache(); 10062 break; 10063 default: 10064 break; 10065 } 10066 10067 mLayerType = layerType; 10068 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 10069 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 10070 mLocalDirtyRect = layerDisabled ? null : new Rect(); 10071 10072 invalidateParentCaches(); 10073 invalidate(true); 10074 } 10075 10076 /** 10077 * Indicates whether this view has a static layer. A view with layer type 10078 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 10079 * dynamic. 10080 */ 10081 boolean hasStaticLayer() { 10082 return mLayerType == LAYER_TYPE_NONE; 10083 } 10084 10085 /** 10086 * Indicates what type of layer is currently associated with this view. By default 10087 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 10088 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 10089 * for more information on the different types of layers. 10090 * 10091 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 10092 * {@link #LAYER_TYPE_HARDWARE} 10093 * 10094 * @see #setLayerType(int, android.graphics.Paint) 10095 * @see #buildLayer() 10096 * @see #LAYER_TYPE_NONE 10097 * @see #LAYER_TYPE_SOFTWARE 10098 * @see #LAYER_TYPE_HARDWARE 10099 */ 10100 public int getLayerType() { 10101 return mLayerType; 10102 } 10103 10104 /** 10105 * Forces this view's layer to be created and this view to be rendered 10106 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 10107 * invoking this method will have no effect. 10108 * 10109 * This method can for instance be used to render a view into its layer before 10110 * starting an animation. If this view is complex, rendering into the layer 10111 * before starting the animation will avoid skipping frames. 10112 * 10113 * @throws IllegalStateException If this view is not attached to a window 10114 * 10115 * @see #setLayerType(int, android.graphics.Paint) 10116 */ 10117 public void buildLayer() { 10118 if (mLayerType == LAYER_TYPE_NONE) return; 10119 10120 if (mAttachInfo == null) { 10121 throw new IllegalStateException("This view must be attached to a window first"); 10122 } 10123 10124 switch (mLayerType) { 10125 case LAYER_TYPE_HARDWARE: 10126 if (mAttachInfo.mHardwareRenderer != null && 10127 mAttachInfo.mHardwareRenderer.isEnabled() && 10128 mAttachInfo.mHardwareRenderer.validate()) { 10129 getHardwareLayer(); 10130 } 10131 break; 10132 case LAYER_TYPE_SOFTWARE: 10133 buildDrawingCache(true); 10134 break; 10135 } 10136 } 10137 10138 // Make sure the HardwareRenderer.validate() was invoked before calling this method 10139 void flushLayer() { 10140 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 10141 mHardwareLayer.flush(); 10142 } 10143 } 10144 10145 /** 10146 * <p>Returns a hardware layer that can be used to draw this view again 10147 * without executing its draw method.</p> 10148 * 10149 * @return A HardwareLayer ready to render, or null if an error occurred. 10150 */ 10151 HardwareLayer getHardwareLayer() { 10152 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 10153 !mAttachInfo.mHardwareRenderer.isEnabled()) { 10154 return null; 10155 } 10156 10157 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 10158 10159 final int width = mRight - mLeft; 10160 final int height = mBottom - mTop; 10161 10162 if (width == 0 || height == 0) { 10163 return null; 10164 } 10165 10166 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 10167 if (mHardwareLayer == null) { 10168 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 10169 width, height, isOpaque()); 10170 mLocalDirtyRect.setEmpty(); 10171 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 10172 mHardwareLayer.resize(width, height); 10173 mLocalDirtyRect.setEmpty(); 10174 } 10175 10176 // The layer is not valid if the underlying GPU resources cannot be allocated 10177 if (!mHardwareLayer.isValid()) { 10178 return null; 10179 } 10180 10181 HardwareCanvas currentCanvas = mAttachInfo.mHardwareCanvas; 10182 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 10183 10184 // Make sure all the GPU resources have been properly allocated 10185 if (canvas == null) { 10186 mHardwareLayer.end(currentCanvas); 10187 return null; 10188 } 10189 10190 mAttachInfo.mHardwareCanvas = canvas; 10191 try { 10192 canvas.setViewport(width, height); 10193 canvas.onPreDraw(mLocalDirtyRect); 10194 mLocalDirtyRect.setEmpty(); 10195 10196 final int restoreCount = canvas.save(); 10197 10198 computeScroll(); 10199 canvas.translate(-mScrollX, -mScrollY); 10200 10201 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10202 10203 // Fast path for layouts with no backgrounds 10204 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10205 mPrivateFlags &= ~DIRTY_MASK; 10206 dispatchDraw(canvas); 10207 } else { 10208 draw(canvas); 10209 } 10210 10211 canvas.restoreToCount(restoreCount); 10212 } finally { 10213 canvas.onPostDraw(); 10214 mHardwareLayer.end(currentCanvas); 10215 mAttachInfo.mHardwareCanvas = currentCanvas; 10216 } 10217 } 10218 10219 return mHardwareLayer; 10220 } 10221 10222 /** 10223 * Destroys this View's hardware layer if possible. 10224 * 10225 * @return True if the layer was destroyed, false otherwise. 10226 * 10227 * @see #setLayerType(int, android.graphics.Paint) 10228 * @see #LAYER_TYPE_HARDWARE 10229 */ 10230 boolean destroyLayer() { 10231 if (mHardwareLayer != null) { 10232 AttachInfo info = mAttachInfo; 10233 if (info != null && info.mHardwareRenderer != null && 10234 info.mHardwareRenderer.isEnabled() && info.mHardwareRenderer.validate()) { 10235 mHardwareLayer.destroy(); 10236 mHardwareLayer = null; 10237 10238 invalidate(true); 10239 invalidateParentCaches(); 10240 } 10241 return true; 10242 } 10243 return false; 10244 } 10245 10246 /** 10247 * Destroys all hardware rendering resources. This method is invoked 10248 * when the system needs to reclaim resources. Upon execution of this 10249 * method, you should free any OpenGL resources created by the view. 10250 * 10251 * Note: you <strong>must</strong> call 10252 * <code>super.destroyHardwareResources()</code> when overriding 10253 * this method. 10254 * 10255 * @hide 10256 */ 10257 protected void destroyHardwareResources() { 10258 destroyLayer(); 10259 } 10260 10261 /** 10262 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 10263 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 10264 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 10265 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 10266 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 10267 * null.</p> 10268 * 10269 * <p>Enabling the drawing cache is similar to 10270 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 10271 * acceleration is turned off. When hardware acceleration is turned on, enabling the 10272 * drawing cache has no effect on rendering because the system uses a different mechanism 10273 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 10274 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 10275 * for information on how to enable software and hardware layers.</p> 10276 * 10277 * <p>This API can be used to manually generate 10278 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 10279 * {@link #getDrawingCache()}.</p> 10280 * 10281 * @param enabled true to enable the drawing cache, false otherwise 10282 * 10283 * @see #isDrawingCacheEnabled() 10284 * @see #getDrawingCache() 10285 * @see #buildDrawingCache() 10286 * @see #setLayerType(int, android.graphics.Paint) 10287 */ 10288 public void setDrawingCacheEnabled(boolean enabled) { 10289 mCachingFailed = false; 10290 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 10291 } 10292 10293 /** 10294 * <p>Indicates whether the drawing cache is enabled for this view.</p> 10295 * 10296 * @return true if the drawing cache is enabled 10297 * 10298 * @see #setDrawingCacheEnabled(boolean) 10299 * @see #getDrawingCache() 10300 */ 10301 @ViewDebug.ExportedProperty(category = "drawing") 10302 public boolean isDrawingCacheEnabled() { 10303 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 10304 } 10305 10306 /** 10307 * Debugging utility which recursively outputs the dirty state of a view and its 10308 * descendants. 10309 * 10310 * @hide 10311 */ 10312 @SuppressWarnings({"UnusedDeclaration"}) 10313 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 10314 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 10315 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 10316 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 10317 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 10318 if (clear) { 10319 mPrivateFlags &= clearMask; 10320 } 10321 if (this instanceof ViewGroup) { 10322 ViewGroup parent = (ViewGroup) this; 10323 final int count = parent.getChildCount(); 10324 for (int i = 0; i < count; i++) { 10325 final View child = parent.getChildAt(i); 10326 child.outputDirtyFlags(indent + " ", clear, clearMask); 10327 } 10328 } 10329 } 10330 10331 /** 10332 * This method is used by ViewGroup to cause its children to restore or recreate their 10333 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 10334 * to recreate its own display list, which would happen if it went through the normal 10335 * draw/dispatchDraw mechanisms. 10336 * 10337 * @hide 10338 */ 10339 protected void dispatchGetDisplayList() {} 10340 10341 /** 10342 * A view that is not attached or hardware accelerated cannot create a display list. 10343 * This method checks these conditions and returns the appropriate result. 10344 * 10345 * @return true if view has the ability to create a display list, false otherwise. 10346 * 10347 * @hide 10348 */ 10349 public boolean canHaveDisplayList() { 10350 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 10351 } 10352 10353 /** 10354 * @return The HardwareRenderer associated with that view or null if hardware rendering 10355 * is not supported or this this has not been attached to a window. 10356 * 10357 * @hide 10358 */ 10359 public HardwareRenderer getHardwareRenderer() { 10360 if (mAttachInfo != null) { 10361 return mAttachInfo.mHardwareRenderer; 10362 } 10363 return null; 10364 } 10365 10366 /** 10367 * <p>Returns a display list that can be used to draw this view again 10368 * without executing its draw method.</p> 10369 * 10370 * @return A DisplayList ready to replay, or null if caching is not enabled. 10371 * 10372 * @hide 10373 */ 10374 public DisplayList getDisplayList() { 10375 if (!canHaveDisplayList()) { 10376 return null; 10377 } 10378 10379 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 10380 mDisplayList == null || !mDisplayList.isValid() || 10381 mRecreateDisplayList)) { 10382 // Don't need to recreate the display list, just need to tell our 10383 // children to restore/recreate theirs 10384 if (mDisplayList != null && mDisplayList.isValid() && 10385 !mRecreateDisplayList) { 10386 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10387 mPrivateFlags &= ~DIRTY_MASK; 10388 dispatchGetDisplayList(); 10389 10390 return mDisplayList; 10391 } 10392 10393 // If we got here, we're recreating it. Mark it as such to ensure that 10394 // we copy in child display lists into ours in drawChild() 10395 mRecreateDisplayList = true; 10396 if (mDisplayList == null) { 10397 final String name = getClass().getSimpleName(); 10398 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 10399 // If we're creating a new display list, make sure our parent gets invalidated 10400 // since they will need to recreate their display list to account for this 10401 // new child display list. 10402 invalidateParentCaches(); 10403 } 10404 10405 final HardwareCanvas canvas = mDisplayList.start(); 10406 int restoreCount = 0; 10407 try { 10408 int width = mRight - mLeft; 10409 int height = mBottom - mTop; 10410 10411 canvas.setViewport(width, height); 10412 // The dirty rect should always be null for a display list 10413 canvas.onPreDraw(null); 10414 10415 computeScroll(); 10416 10417 restoreCount = canvas.save(); 10418 canvas.translate(-mScrollX, -mScrollY); 10419 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10420 mPrivateFlags &= ~DIRTY_MASK; 10421 10422 // Fast path for layouts with no backgrounds 10423 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10424 dispatchDraw(canvas); 10425 } else { 10426 draw(canvas); 10427 } 10428 } finally { 10429 canvas.restoreToCount(restoreCount); 10430 canvas.onPostDraw(); 10431 10432 mDisplayList.end(); 10433 } 10434 } else { 10435 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10436 mPrivateFlags &= ~DIRTY_MASK; 10437 } 10438 10439 return mDisplayList; 10440 } 10441 10442 /** 10443 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 10444 * 10445 * @return A non-scaled bitmap representing this view or null if cache is disabled. 10446 * 10447 * @see #getDrawingCache(boolean) 10448 */ 10449 public Bitmap getDrawingCache() { 10450 return getDrawingCache(false); 10451 } 10452 10453 /** 10454 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 10455 * is null when caching is disabled. If caching is enabled and the cache is not ready, 10456 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 10457 * draw from the cache when the cache is enabled. To benefit from the cache, you must 10458 * request the drawing cache by calling this method and draw it on screen if the 10459 * returned bitmap is not null.</p> 10460 * 10461 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10462 * this method will create a bitmap of the same size as this view. Because this bitmap 10463 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10464 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10465 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10466 * size than the view. This implies that your application must be able to handle this 10467 * size.</p> 10468 * 10469 * @param autoScale Indicates whether the generated bitmap should be scaled based on 10470 * the current density of the screen when the application is in compatibility 10471 * mode. 10472 * 10473 * @return A bitmap representing this view or null if cache is disabled. 10474 * 10475 * @see #setDrawingCacheEnabled(boolean) 10476 * @see #isDrawingCacheEnabled() 10477 * @see #buildDrawingCache(boolean) 10478 * @see #destroyDrawingCache() 10479 */ 10480 public Bitmap getDrawingCache(boolean autoScale) { 10481 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 10482 return null; 10483 } 10484 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 10485 buildDrawingCache(autoScale); 10486 } 10487 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 10488 } 10489 10490 /** 10491 * <p>Frees the resources used by the drawing cache. If you call 10492 * {@link #buildDrawingCache()} manually without calling 10493 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10494 * should cleanup the cache with this method afterwards.</p> 10495 * 10496 * @see #setDrawingCacheEnabled(boolean) 10497 * @see #buildDrawingCache() 10498 * @see #getDrawingCache() 10499 */ 10500 public void destroyDrawingCache() { 10501 if (mDrawingCache != null) { 10502 mDrawingCache.recycle(); 10503 mDrawingCache = null; 10504 } 10505 if (mUnscaledDrawingCache != null) { 10506 mUnscaledDrawingCache.recycle(); 10507 mUnscaledDrawingCache = null; 10508 } 10509 } 10510 10511 /** 10512 * Setting a solid background color for the drawing cache's bitmaps will improve 10513 * performance and memory usage. Note, though that this should only be used if this 10514 * view will always be drawn on top of a solid color. 10515 * 10516 * @param color The background color to use for the drawing cache's bitmap 10517 * 10518 * @see #setDrawingCacheEnabled(boolean) 10519 * @see #buildDrawingCache() 10520 * @see #getDrawingCache() 10521 */ 10522 public void setDrawingCacheBackgroundColor(int color) { 10523 if (color != mDrawingCacheBackgroundColor) { 10524 mDrawingCacheBackgroundColor = color; 10525 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10526 } 10527 } 10528 10529 /** 10530 * @see #setDrawingCacheBackgroundColor(int) 10531 * 10532 * @return The background color to used for the drawing cache's bitmap 10533 */ 10534 public int getDrawingCacheBackgroundColor() { 10535 return mDrawingCacheBackgroundColor; 10536 } 10537 10538 /** 10539 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 10540 * 10541 * @see #buildDrawingCache(boolean) 10542 */ 10543 public void buildDrawingCache() { 10544 buildDrawingCache(false); 10545 } 10546 10547 /** 10548 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 10549 * 10550 * <p>If you call {@link #buildDrawingCache()} manually without calling 10551 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10552 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 10553 * 10554 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10555 * this method will create a bitmap of the same size as this view. Because this bitmap 10556 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10557 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10558 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10559 * size than the view. This implies that your application must be able to handle this 10560 * size.</p> 10561 * 10562 * <p>You should avoid calling this method when hardware acceleration is enabled. If 10563 * you do not need the drawing cache bitmap, calling this method will increase memory 10564 * usage and cause the view to be rendered in software once, thus negatively impacting 10565 * performance.</p> 10566 * 10567 * @see #getDrawingCache() 10568 * @see #destroyDrawingCache() 10569 */ 10570 public void buildDrawingCache(boolean autoScale) { 10571 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 10572 mDrawingCache == null : mUnscaledDrawingCache == null)) { 10573 mCachingFailed = false; 10574 10575 if (ViewDebug.TRACE_HIERARCHY) { 10576 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 10577 } 10578 10579 int width = mRight - mLeft; 10580 int height = mBottom - mTop; 10581 10582 final AttachInfo attachInfo = mAttachInfo; 10583 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 10584 10585 if (autoScale && scalingRequired) { 10586 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 10587 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 10588 } 10589 10590 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 10591 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 10592 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 10593 10594 if (width <= 0 || height <= 0 || 10595 // Projected bitmap size in bytes 10596 (width * height * (opaque && !use32BitCache ? 2 : 4) > 10597 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 10598 destroyDrawingCache(); 10599 mCachingFailed = true; 10600 return; 10601 } 10602 10603 boolean clear = true; 10604 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 10605 10606 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 10607 Bitmap.Config quality; 10608 if (!opaque) { 10609 // Never pick ARGB_4444 because it looks awful 10610 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 10611 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 10612 case DRAWING_CACHE_QUALITY_AUTO: 10613 quality = Bitmap.Config.ARGB_8888; 10614 break; 10615 case DRAWING_CACHE_QUALITY_LOW: 10616 quality = Bitmap.Config.ARGB_8888; 10617 break; 10618 case DRAWING_CACHE_QUALITY_HIGH: 10619 quality = Bitmap.Config.ARGB_8888; 10620 break; 10621 default: 10622 quality = Bitmap.Config.ARGB_8888; 10623 break; 10624 } 10625 } else { 10626 // Optimization for translucent windows 10627 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 10628 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 10629 } 10630 10631 // Try to cleanup memory 10632 if (bitmap != null) bitmap.recycle(); 10633 10634 try { 10635 bitmap = Bitmap.createBitmap(width, height, quality); 10636 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 10637 if (autoScale) { 10638 mDrawingCache = bitmap; 10639 } else { 10640 mUnscaledDrawingCache = bitmap; 10641 } 10642 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 10643 } catch (OutOfMemoryError e) { 10644 // If there is not enough memory to create the bitmap cache, just 10645 // ignore the issue as bitmap caches are not required to draw the 10646 // view hierarchy 10647 if (autoScale) { 10648 mDrawingCache = null; 10649 } else { 10650 mUnscaledDrawingCache = null; 10651 } 10652 mCachingFailed = true; 10653 return; 10654 } 10655 10656 clear = drawingCacheBackgroundColor != 0; 10657 } 10658 10659 Canvas canvas; 10660 if (attachInfo != null) { 10661 canvas = attachInfo.mCanvas; 10662 if (canvas == null) { 10663 canvas = new Canvas(); 10664 } 10665 canvas.setBitmap(bitmap); 10666 // Temporarily clobber the cached Canvas in case one of our children 10667 // is also using a drawing cache. Without this, the children would 10668 // steal the canvas by attaching their own bitmap to it and bad, bad 10669 // thing would happen (invisible views, corrupted drawings, etc.) 10670 attachInfo.mCanvas = null; 10671 } else { 10672 // This case should hopefully never or seldom happen 10673 canvas = new Canvas(bitmap); 10674 } 10675 10676 if (clear) { 10677 bitmap.eraseColor(drawingCacheBackgroundColor); 10678 } 10679 10680 computeScroll(); 10681 final int restoreCount = canvas.save(); 10682 10683 if (autoScale && scalingRequired) { 10684 final float scale = attachInfo.mApplicationScale; 10685 canvas.scale(scale, scale); 10686 } 10687 10688 canvas.translate(-mScrollX, -mScrollY); 10689 10690 mPrivateFlags |= DRAWN; 10691 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 10692 mLayerType != LAYER_TYPE_NONE) { 10693 mPrivateFlags |= DRAWING_CACHE_VALID; 10694 } 10695 10696 // Fast path for layouts with no backgrounds 10697 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10698 if (ViewDebug.TRACE_HIERARCHY) { 10699 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10700 } 10701 mPrivateFlags &= ~DIRTY_MASK; 10702 dispatchDraw(canvas); 10703 } else { 10704 draw(canvas); 10705 } 10706 10707 canvas.restoreToCount(restoreCount); 10708 canvas.setBitmap(null); 10709 10710 if (attachInfo != null) { 10711 // Restore the cached Canvas for our siblings 10712 attachInfo.mCanvas = canvas; 10713 } 10714 } 10715 } 10716 10717 /** 10718 * Create a snapshot of the view into a bitmap. We should probably make 10719 * some form of this public, but should think about the API. 10720 */ 10721 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 10722 int width = mRight - mLeft; 10723 int height = mBottom - mTop; 10724 10725 final AttachInfo attachInfo = mAttachInfo; 10726 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 10727 width = (int) ((width * scale) + 0.5f); 10728 height = (int) ((height * scale) + 0.5f); 10729 10730 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 10731 if (bitmap == null) { 10732 throw new OutOfMemoryError(); 10733 } 10734 10735 Resources resources = getResources(); 10736 if (resources != null) { 10737 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 10738 } 10739 10740 Canvas canvas; 10741 if (attachInfo != null) { 10742 canvas = attachInfo.mCanvas; 10743 if (canvas == null) { 10744 canvas = new Canvas(); 10745 } 10746 canvas.setBitmap(bitmap); 10747 // Temporarily clobber the cached Canvas in case one of our children 10748 // is also using a drawing cache. Without this, the children would 10749 // steal the canvas by attaching their own bitmap to it and bad, bad 10750 // things would happen (invisible views, corrupted drawings, etc.) 10751 attachInfo.mCanvas = null; 10752 } else { 10753 // This case should hopefully never or seldom happen 10754 canvas = new Canvas(bitmap); 10755 } 10756 10757 if ((backgroundColor & 0xff000000) != 0) { 10758 bitmap.eraseColor(backgroundColor); 10759 } 10760 10761 computeScroll(); 10762 final int restoreCount = canvas.save(); 10763 canvas.scale(scale, scale); 10764 canvas.translate(-mScrollX, -mScrollY); 10765 10766 // Temporarily remove the dirty mask 10767 int flags = mPrivateFlags; 10768 mPrivateFlags &= ~DIRTY_MASK; 10769 10770 // Fast path for layouts with no backgrounds 10771 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10772 dispatchDraw(canvas); 10773 } else { 10774 draw(canvas); 10775 } 10776 10777 mPrivateFlags = flags; 10778 10779 canvas.restoreToCount(restoreCount); 10780 canvas.setBitmap(null); 10781 10782 if (attachInfo != null) { 10783 // Restore the cached Canvas for our siblings 10784 attachInfo.mCanvas = canvas; 10785 } 10786 10787 return bitmap; 10788 } 10789 10790 /** 10791 * Indicates whether this View is currently in edit mode. A View is usually 10792 * in edit mode when displayed within a developer tool. For instance, if 10793 * this View is being drawn by a visual user interface builder, this method 10794 * should return true. 10795 * 10796 * Subclasses should check the return value of this method to provide 10797 * different behaviors if their normal behavior might interfere with the 10798 * host environment. For instance: the class spawns a thread in its 10799 * constructor, the drawing code relies on device-specific features, etc. 10800 * 10801 * This method is usually checked in the drawing code of custom widgets. 10802 * 10803 * @return True if this View is in edit mode, false otherwise. 10804 */ 10805 public boolean isInEditMode() { 10806 return false; 10807 } 10808 10809 /** 10810 * If the View draws content inside its padding and enables fading edges, 10811 * it needs to support padding offsets. Padding offsets are added to the 10812 * fading edges to extend the length of the fade so that it covers pixels 10813 * drawn inside the padding. 10814 * 10815 * Subclasses of this class should override this method if they need 10816 * to draw content inside the padding. 10817 * 10818 * @return True if padding offset must be applied, false otherwise. 10819 * 10820 * @see #getLeftPaddingOffset() 10821 * @see #getRightPaddingOffset() 10822 * @see #getTopPaddingOffset() 10823 * @see #getBottomPaddingOffset() 10824 * 10825 * @since CURRENT 10826 */ 10827 protected boolean isPaddingOffsetRequired() { 10828 return false; 10829 } 10830 10831 /** 10832 * Amount by which to extend the left fading region. Called only when 10833 * {@link #isPaddingOffsetRequired()} returns true. 10834 * 10835 * @return The left padding offset in pixels. 10836 * 10837 * @see #isPaddingOffsetRequired() 10838 * 10839 * @since CURRENT 10840 */ 10841 protected int getLeftPaddingOffset() { 10842 return 0; 10843 } 10844 10845 /** 10846 * Amount by which to extend the right fading region. Called only when 10847 * {@link #isPaddingOffsetRequired()} returns true. 10848 * 10849 * @return The right padding offset in pixels. 10850 * 10851 * @see #isPaddingOffsetRequired() 10852 * 10853 * @since CURRENT 10854 */ 10855 protected int getRightPaddingOffset() { 10856 return 0; 10857 } 10858 10859 /** 10860 * Amount by which to extend the top fading region. Called only when 10861 * {@link #isPaddingOffsetRequired()} returns true. 10862 * 10863 * @return The top padding offset in pixels. 10864 * 10865 * @see #isPaddingOffsetRequired() 10866 * 10867 * @since CURRENT 10868 */ 10869 protected int getTopPaddingOffset() { 10870 return 0; 10871 } 10872 10873 /** 10874 * Amount by which to extend the bottom fading region. Called only when 10875 * {@link #isPaddingOffsetRequired()} returns true. 10876 * 10877 * @return The bottom padding offset in pixels. 10878 * 10879 * @see #isPaddingOffsetRequired() 10880 * 10881 * @since CURRENT 10882 */ 10883 protected int getBottomPaddingOffset() { 10884 return 0; 10885 } 10886 10887 /** 10888 * @hide 10889 * @param offsetRequired 10890 */ 10891 protected int getFadeTop(boolean offsetRequired) { 10892 int top = mPaddingTop; 10893 if (offsetRequired) top += getTopPaddingOffset(); 10894 return top; 10895 } 10896 10897 /** 10898 * @hide 10899 * @param offsetRequired 10900 */ 10901 protected int getFadeHeight(boolean offsetRequired) { 10902 int padding = mPaddingTop; 10903 if (offsetRequired) padding += getTopPaddingOffset(); 10904 return mBottom - mTop - mPaddingBottom - padding; 10905 } 10906 10907 /** 10908 * <p>Indicates whether this view is attached to an hardware accelerated 10909 * window or not.</p> 10910 * 10911 * <p>Even if this method returns true, it does not mean that every call 10912 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 10913 * accelerated {@link android.graphics.Canvas}. For instance, if this view 10914 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 10915 * window is hardware accelerated, 10916 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 10917 * return false, and this method will return true.</p> 10918 * 10919 * @return True if the view is attached to a window and the window is 10920 * hardware accelerated; false in any other case. 10921 */ 10922 public boolean isHardwareAccelerated() { 10923 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 10924 } 10925 10926 /** 10927 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 10928 * case of an active Animation being run on the view. 10929 */ 10930 private boolean drawAnimation(ViewGroup parent, long drawingTime, 10931 Animation a, boolean scalingRequired) { 10932 Transformation invalidationTransform; 10933 final int flags = parent.mGroupFlags; 10934 final boolean initialized = a.isInitialized(); 10935 if (!initialized) { 10936 a.initialize(mRight - mLeft, mBottom - mTop, getWidth(), getHeight()); 10937 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 10938 onAnimationStart(); 10939 } 10940 10941 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 10942 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 10943 if (parent.mInvalidationTransformation == null) { 10944 parent.mInvalidationTransformation = new Transformation(); 10945 } 10946 invalidationTransform = parent.mInvalidationTransformation; 10947 a.getTransformation(drawingTime, invalidationTransform, 1f); 10948 } else { 10949 invalidationTransform = parent.mChildTransformation; 10950 } 10951 if (more) { 10952 if (!a.willChangeBounds()) { 10953 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 10954 parent.FLAG_OPTIMIZE_INVALIDATE) { 10955 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 10956 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 10957 // The child need to draw an animation, potentially offscreen, so 10958 // make sure we do not cancel invalidate requests 10959 parent.mPrivateFlags |= DRAW_ANIMATION; 10960 parent.invalidate(mLeft, mTop, mRight, mBottom); 10961 } 10962 } else { 10963 if (parent.mInvalidateRegion == null) { 10964 parent.mInvalidateRegion = new RectF(); 10965 } 10966 final RectF region = parent.mInvalidateRegion; 10967 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 10968 invalidationTransform); 10969 10970 // The child need to draw an animation, potentially offscreen, so 10971 // make sure we do not cancel invalidate requests 10972 parent.mPrivateFlags |= DRAW_ANIMATION; 10973 10974 final int left = mLeft + (int) region.left; 10975 final int top = mTop + (int) region.top; 10976 parent.invalidate(left, top, left + (int) (region.width() + .5f), 10977 top + (int) (region.height() + .5f)); 10978 } 10979 } 10980 return more; 10981 } 10982 10983 /** 10984 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 10985 * This draw() method is an implementation detail and is not intended to be overridden or 10986 * to be called from anywhere else other than ViewGroup.drawChild(). 10987 */ 10988 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 10989 boolean more = false; 10990 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 10991 final int flags = parent.mGroupFlags; 10992 10993 if ((flags & parent.FLAG_CLEAR_TRANSFORMATION) == parent.FLAG_CLEAR_TRANSFORMATION) { 10994 parent.mChildTransformation.clear(); 10995 parent.mGroupFlags &= ~parent.FLAG_CLEAR_TRANSFORMATION; 10996 } 10997 10998 Transformation transformToApply = null; 10999 boolean concatMatrix = false; 11000 11001 boolean scalingRequired = false; 11002 boolean caching; 11003 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 11004 11005 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 11006 if ((flags & parent.FLAG_CHILDREN_DRAWN_WITH_CACHE) == parent.FLAG_CHILDREN_DRAWN_WITH_CACHE || 11007 (flags & parent.FLAG_ALWAYS_DRAWN_WITH_CACHE) == parent.FLAG_ALWAYS_DRAWN_WITH_CACHE) { 11008 caching = true; 11009 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 11010 } else { 11011 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 11012 } 11013 11014 final Animation a = getAnimation(); 11015 if (a != null) { 11016 more = drawAnimation(parent, drawingTime, a, scalingRequired); 11017 concatMatrix = a.willChangeTransformationMatrix(); 11018 transformToApply = parent.mChildTransformation; 11019 } else if ((flags & parent.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 11020 parent.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 11021 final boolean hasTransform = 11022 parent.getChildStaticTransformation(this, parent.mChildTransformation); 11023 if (hasTransform) { 11024 final int transformType = parent.mChildTransformation.getTransformationType(); 11025 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 11026 parent.mChildTransformation : null; 11027 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 11028 } 11029 } 11030 11031 concatMatrix |= !childHasIdentityMatrix; 11032 11033 // Sets the flag as early as possible to allow draw() implementations 11034 // to call invalidate() successfully when doing animations 11035 mPrivateFlags |= DRAWN; 11036 11037 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 11038 (mPrivateFlags & DRAW_ANIMATION) == 0) { 11039 return more; 11040 } 11041 11042 if (hardwareAccelerated) { 11043 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 11044 // retain the flag's value temporarily in the mRecreateDisplayList flag 11045 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 11046 mPrivateFlags &= ~INVALIDATED; 11047 } 11048 11049 computeScroll(); 11050 11051 final int sx = mScrollX; 11052 final int sy = mScrollY; 11053 11054 DisplayList displayList = null; 11055 Bitmap cache = null; 11056 boolean hasDisplayList = false; 11057 if (caching) { 11058 if (!hardwareAccelerated) { 11059 if (layerType != LAYER_TYPE_NONE) { 11060 layerType = LAYER_TYPE_SOFTWARE; 11061 buildDrawingCache(true); 11062 } 11063 cache = getDrawingCache(true); 11064 } else { 11065 switch (layerType) { 11066 case LAYER_TYPE_SOFTWARE: 11067 buildDrawingCache(true); 11068 cache = getDrawingCache(true); 11069 break; 11070 case LAYER_TYPE_NONE: 11071 // Delay getting the display list until animation-driven alpha values are 11072 // set up and possibly passed on to the view 11073 hasDisplayList = canHaveDisplayList(); 11074 break; 11075 } 11076 } 11077 } 11078 11079 final boolean hasNoCache = cache == null || hasDisplayList; 11080 final boolean offsetForScroll = cache == null && !hasDisplayList && 11081 layerType != LAYER_TYPE_HARDWARE; 11082 11083 final int restoreTo = canvas.save(); 11084 if (offsetForScroll) { 11085 canvas.translate(mLeft - sx, mTop - sy); 11086 } else { 11087 canvas.translate(mLeft, mTop); 11088 if (scalingRequired) { 11089 // mAttachInfo cannot be null, otherwise scalingRequired == false 11090 final float scale = 1.0f / mAttachInfo.mApplicationScale; 11091 canvas.scale(scale, scale); 11092 } 11093 } 11094 11095 float alpha = getAlpha(); 11096 if (transformToApply != null || alpha < 1.0f || !hasIdentityMatrix()) { 11097 if (transformToApply != null || !childHasIdentityMatrix) { 11098 int transX = 0; 11099 int transY = 0; 11100 11101 if (offsetForScroll) { 11102 transX = -sx; 11103 transY = -sy; 11104 } 11105 11106 if (transformToApply != null) { 11107 if (concatMatrix) { 11108 // Undo the scroll translation, apply the transformation matrix, 11109 // then redo the scroll translate to get the correct result. 11110 canvas.translate(-transX, -transY); 11111 canvas.concat(transformToApply.getMatrix()); 11112 canvas.translate(transX, transY); 11113 parent.mGroupFlags |= parent.FLAG_CLEAR_TRANSFORMATION; 11114 } 11115 11116 float transformAlpha = transformToApply.getAlpha(); 11117 if (transformAlpha < 1.0f) { 11118 alpha *= transformToApply.getAlpha(); 11119 parent.mGroupFlags |= parent.FLAG_CLEAR_TRANSFORMATION; 11120 } 11121 } 11122 11123 if (!childHasIdentityMatrix) { 11124 canvas.translate(-transX, -transY); 11125 canvas.concat(getMatrix()); 11126 canvas.translate(transX, transY); 11127 } 11128 } 11129 11130 if (alpha < 1.0f) { 11131 parent.mGroupFlags |= parent.FLAG_CLEAR_TRANSFORMATION; 11132 if (hasNoCache) { 11133 final int multipliedAlpha = (int) (255 * alpha); 11134 if (!onSetAlpha(multipliedAlpha)) { 11135 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 11136 if ((flags & parent.FLAG_CLIP_CHILDREN) == parent.FLAG_CLIP_CHILDREN || 11137 layerType != LAYER_TYPE_NONE) { 11138 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 11139 } 11140 if (layerType == LAYER_TYPE_NONE) { 11141 final int scrollX = hasDisplayList ? 0 : sx; 11142 final int scrollY = hasDisplayList ? 0 : sy; 11143 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 11144 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 11145 } 11146 } else { 11147 // Alpha is handled by the child directly, clobber the layer's alpha 11148 mPrivateFlags |= ALPHA_SET; 11149 } 11150 } 11151 } 11152 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 11153 onSetAlpha(255); 11154 mPrivateFlags &= ~ALPHA_SET; 11155 } 11156 11157 if ((flags & parent.FLAG_CLIP_CHILDREN) == parent.FLAG_CLIP_CHILDREN) { 11158 if (offsetForScroll) { 11159 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 11160 } else { 11161 if (!scalingRequired || cache == null) { 11162 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 11163 } else { 11164 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 11165 } 11166 } 11167 } 11168 11169 if (hasDisplayList) { 11170 displayList = getDisplayList(); 11171 if (!displayList.isValid()) { 11172 // Uncommon, but possible. If a view is removed from the hierarchy during the call 11173 // to getDisplayList(), the display list will be marked invalid and we should not 11174 // try to use it again. 11175 displayList = null; 11176 hasDisplayList = false; 11177 } 11178 } 11179 11180 if (hasNoCache) { 11181 boolean layerRendered = false; 11182 if (layerType == LAYER_TYPE_HARDWARE) { 11183 final HardwareLayer layer = getHardwareLayer(); 11184 if (layer != null && layer.isValid()) { 11185 mLayerPaint.setAlpha((int) (alpha * 255)); 11186 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 11187 layerRendered = true; 11188 } else { 11189 final int scrollX = hasDisplayList ? 0 : sx; 11190 final int scrollY = hasDisplayList ? 0 : sy; 11191 canvas.saveLayer(scrollX, scrollY, 11192 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 11193 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 11194 } 11195 } 11196 11197 if (!layerRendered) { 11198 if (!hasDisplayList) { 11199 // Fast path for layouts with no backgrounds 11200 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 11201 if (ViewDebug.TRACE_HIERARCHY) { 11202 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 11203 } 11204 mPrivateFlags &= ~DIRTY_MASK; 11205 dispatchDraw(canvas); 11206 } else { 11207 draw(canvas); 11208 } 11209 } else { 11210 mPrivateFlags &= ~DIRTY_MASK; 11211 ((HardwareCanvas) canvas).drawDisplayList(displayList, 11212 mRight - mLeft, mBottom - mTop, null); 11213 } 11214 } 11215 } else if (cache != null) { 11216 mPrivateFlags &= ~DIRTY_MASK; 11217 Paint cachePaint; 11218 11219 if (layerType == LAYER_TYPE_NONE) { 11220 cachePaint = parent.mCachePaint; 11221 if (cachePaint == null) { 11222 cachePaint = new Paint(); 11223 cachePaint.setDither(false); 11224 parent.mCachePaint = cachePaint; 11225 } 11226 if (alpha < 1.0f) { 11227 cachePaint.setAlpha((int) (alpha * 255)); 11228 parent.mGroupFlags |= parent.FLAG_ALPHA_LOWER_THAN_ONE; 11229 } else if ((flags & parent.FLAG_ALPHA_LOWER_THAN_ONE) == 11230 parent.FLAG_ALPHA_LOWER_THAN_ONE) { 11231 cachePaint.setAlpha(255); 11232 parent.mGroupFlags &= ~parent.FLAG_ALPHA_LOWER_THAN_ONE; 11233 } 11234 } else { 11235 cachePaint = mLayerPaint; 11236 cachePaint.setAlpha((int) (alpha * 255)); 11237 } 11238 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 11239 } 11240 11241 canvas.restoreToCount(restoreTo); 11242 11243 if (a != null && !more) { 11244 if (!hardwareAccelerated && !a.getFillAfter()) { 11245 onSetAlpha(255); 11246 } 11247 parent.finishAnimatingView(this, a); 11248 } 11249 11250 if (more && hardwareAccelerated) { 11251 // invalidation is the trigger to recreate display lists, so if we're using 11252 // display lists to render, force an invalidate to allow the animation to 11253 // continue drawing another frame 11254 parent.invalidate(true); 11255 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 11256 // alpha animations should cause the child to recreate its display list 11257 invalidate(true); 11258 } 11259 } 11260 11261 mRecreateDisplayList = false; 11262 11263 return more; 11264 } 11265 11266 /** 11267 * Manually render this view (and all of its children) to the given Canvas. 11268 * The view must have already done a full layout before this function is 11269 * called. When implementing a view, implement 11270 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 11271 * If you do need to override this method, call the superclass version. 11272 * 11273 * @param canvas The Canvas to which the View is rendered. 11274 */ 11275 public void draw(Canvas canvas) { 11276 if (ViewDebug.TRACE_HIERARCHY) { 11277 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 11278 } 11279 11280 final int privateFlags = mPrivateFlags; 11281 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 11282 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 11283 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 11284 11285 /* 11286 * Draw traversal performs several drawing steps which must be executed 11287 * in the appropriate order: 11288 * 11289 * 1. Draw the background 11290 * 2. If necessary, save the canvas' layers to prepare for fading 11291 * 3. Draw view's content 11292 * 4. Draw children 11293 * 5. If necessary, draw the fading edges and restore layers 11294 * 6. Draw decorations (scrollbars for instance) 11295 */ 11296 11297 // Step 1, draw the background, if needed 11298 int saveCount; 11299 11300 if (!dirtyOpaque) { 11301 final Drawable background = mBGDrawable; 11302 if (background != null) { 11303 final int scrollX = mScrollX; 11304 final int scrollY = mScrollY; 11305 11306 if (mBackgroundSizeChanged) { 11307 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 11308 mBackgroundSizeChanged = false; 11309 } 11310 11311 if ((scrollX | scrollY) == 0) { 11312 background.draw(canvas); 11313 } else { 11314 canvas.translate(scrollX, scrollY); 11315 background.draw(canvas); 11316 canvas.translate(-scrollX, -scrollY); 11317 } 11318 } 11319 } 11320 11321 // skip step 2 & 5 if possible (common case) 11322 final int viewFlags = mViewFlags; 11323 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 11324 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 11325 if (!verticalEdges && !horizontalEdges) { 11326 // Step 3, draw the content 11327 if (!dirtyOpaque) onDraw(canvas); 11328 11329 // Step 4, draw the children 11330 dispatchDraw(canvas); 11331 11332 // Step 6, draw decorations (scrollbars) 11333 onDrawScrollBars(canvas); 11334 11335 // we're done... 11336 return; 11337 } 11338 11339 /* 11340 * Here we do the full fledged routine... 11341 * (this is an uncommon case where speed matters less, 11342 * this is why we repeat some of the tests that have been 11343 * done above) 11344 */ 11345 11346 boolean drawTop = false; 11347 boolean drawBottom = false; 11348 boolean drawLeft = false; 11349 boolean drawRight = false; 11350 11351 float topFadeStrength = 0.0f; 11352 float bottomFadeStrength = 0.0f; 11353 float leftFadeStrength = 0.0f; 11354 float rightFadeStrength = 0.0f; 11355 11356 // Step 2, save the canvas' layers 11357 int paddingLeft = mPaddingLeft; 11358 11359 final boolean offsetRequired = isPaddingOffsetRequired(); 11360 if (offsetRequired) { 11361 paddingLeft += getLeftPaddingOffset(); 11362 } 11363 11364 int left = mScrollX + paddingLeft; 11365 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 11366 int top = mScrollY + getFadeTop(offsetRequired); 11367 int bottom = top + getFadeHeight(offsetRequired); 11368 11369 if (offsetRequired) { 11370 right += getRightPaddingOffset(); 11371 bottom += getBottomPaddingOffset(); 11372 } 11373 11374 final ScrollabilityCache scrollabilityCache = mScrollCache; 11375 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 11376 int length = (int) fadeHeight; 11377 11378 // clip the fade length if top and bottom fades overlap 11379 // overlapping fades produce odd-looking artifacts 11380 if (verticalEdges && (top + length > bottom - length)) { 11381 length = (bottom - top) / 2; 11382 } 11383 11384 // also clip horizontal fades if necessary 11385 if (horizontalEdges && (left + length > right - length)) { 11386 length = (right - left) / 2; 11387 } 11388 11389 if (verticalEdges) { 11390 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 11391 drawTop = topFadeStrength * fadeHeight > 1.0f; 11392 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 11393 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 11394 } 11395 11396 if (horizontalEdges) { 11397 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 11398 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 11399 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 11400 drawRight = rightFadeStrength * fadeHeight > 1.0f; 11401 } 11402 11403 saveCount = canvas.getSaveCount(); 11404 11405 int solidColor = getSolidColor(); 11406 if (solidColor == 0) { 11407 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 11408 11409 if (drawTop) { 11410 canvas.saveLayer(left, top, right, top + length, null, flags); 11411 } 11412 11413 if (drawBottom) { 11414 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 11415 } 11416 11417 if (drawLeft) { 11418 canvas.saveLayer(left, top, left + length, bottom, null, flags); 11419 } 11420 11421 if (drawRight) { 11422 canvas.saveLayer(right - length, top, right, bottom, null, flags); 11423 } 11424 } else { 11425 scrollabilityCache.setFadeColor(solidColor); 11426 } 11427 11428 // Step 3, draw the content 11429 if (!dirtyOpaque) onDraw(canvas); 11430 11431 // Step 4, draw the children 11432 dispatchDraw(canvas); 11433 11434 // Step 5, draw the fade effect and restore layers 11435 final Paint p = scrollabilityCache.paint; 11436 final Matrix matrix = scrollabilityCache.matrix; 11437 final Shader fade = scrollabilityCache.shader; 11438 11439 if (drawTop) { 11440 matrix.setScale(1, fadeHeight * topFadeStrength); 11441 matrix.postTranslate(left, top); 11442 fade.setLocalMatrix(matrix); 11443 canvas.drawRect(left, top, right, top + length, p); 11444 } 11445 11446 if (drawBottom) { 11447 matrix.setScale(1, fadeHeight * bottomFadeStrength); 11448 matrix.postRotate(180); 11449 matrix.postTranslate(left, bottom); 11450 fade.setLocalMatrix(matrix); 11451 canvas.drawRect(left, bottom - length, right, bottom, p); 11452 } 11453 11454 if (drawLeft) { 11455 matrix.setScale(1, fadeHeight * leftFadeStrength); 11456 matrix.postRotate(-90); 11457 matrix.postTranslate(left, top); 11458 fade.setLocalMatrix(matrix); 11459 canvas.drawRect(left, top, left + length, bottom, p); 11460 } 11461 11462 if (drawRight) { 11463 matrix.setScale(1, fadeHeight * rightFadeStrength); 11464 matrix.postRotate(90); 11465 matrix.postTranslate(right, top); 11466 fade.setLocalMatrix(matrix); 11467 canvas.drawRect(right - length, top, right, bottom, p); 11468 } 11469 11470 canvas.restoreToCount(saveCount); 11471 11472 // Step 6, draw decorations (scrollbars) 11473 onDrawScrollBars(canvas); 11474 } 11475 11476 /** 11477 * Override this if your view is known to always be drawn on top of a solid color background, 11478 * and needs to draw fading edges. Returning a non-zero color enables the view system to 11479 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 11480 * should be set to 0xFF. 11481 * 11482 * @see #setVerticalFadingEdgeEnabled(boolean) 11483 * @see #setHorizontalFadingEdgeEnabled(boolean) 11484 * 11485 * @return The known solid color background for this view, or 0 if the color may vary 11486 */ 11487 @ViewDebug.ExportedProperty(category = "drawing") 11488 public int getSolidColor() { 11489 return 0; 11490 } 11491 11492 /** 11493 * Build a human readable string representation of the specified view flags. 11494 * 11495 * @param flags the view flags to convert to a string 11496 * @return a String representing the supplied flags 11497 */ 11498 private static String printFlags(int flags) { 11499 String output = ""; 11500 int numFlags = 0; 11501 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 11502 output += "TAKES_FOCUS"; 11503 numFlags++; 11504 } 11505 11506 switch (flags & VISIBILITY_MASK) { 11507 case INVISIBLE: 11508 if (numFlags > 0) { 11509 output += " "; 11510 } 11511 output += "INVISIBLE"; 11512 // USELESS HERE numFlags++; 11513 break; 11514 case GONE: 11515 if (numFlags > 0) { 11516 output += " "; 11517 } 11518 output += "GONE"; 11519 // USELESS HERE numFlags++; 11520 break; 11521 default: 11522 break; 11523 } 11524 return output; 11525 } 11526 11527 /** 11528 * Build a human readable string representation of the specified private 11529 * view flags. 11530 * 11531 * @param privateFlags the private view flags to convert to a string 11532 * @return a String representing the supplied flags 11533 */ 11534 private static String printPrivateFlags(int privateFlags) { 11535 String output = ""; 11536 int numFlags = 0; 11537 11538 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 11539 output += "WANTS_FOCUS"; 11540 numFlags++; 11541 } 11542 11543 if ((privateFlags & FOCUSED) == FOCUSED) { 11544 if (numFlags > 0) { 11545 output += " "; 11546 } 11547 output += "FOCUSED"; 11548 numFlags++; 11549 } 11550 11551 if ((privateFlags & SELECTED) == SELECTED) { 11552 if (numFlags > 0) { 11553 output += " "; 11554 } 11555 output += "SELECTED"; 11556 numFlags++; 11557 } 11558 11559 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 11560 if (numFlags > 0) { 11561 output += " "; 11562 } 11563 output += "IS_ROOT_NAMESPACE"; 11564 numFlags++; 11565 } 11566 11567 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 11568 if (numFlags > 0) { 11569 output += " "; 11570 } 11571 output += "HAS_BOUNDS"; 11572 numFlags++; 11573 } 11574 11575 if ((privateFlags & DRAWN) == DRAWN) { 11576 if (numFlags > 0) { 11577 output += " "; 11578 } 11579 output += "DRAWN"; 11580 // USELESS HERE numFlags++; 11581 } 11582 return output; 11583 } 11584 11585 /** 11586 * <p>Indicates whether or not this view's layout will be requested during 11587 * the next hierarchy layout pass.</p> 11588 * 11589 * @return true if the layout will be forced during next layout pass 11590 */ 11591 public boolean isLayoutRequested() { 11592 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 11593 } 11594 11595 /** 11596 * Assign a size and position to a view and all of its 11597 * descendants 11598 * 11599 * <p>This is the second phase of the layout mechanism. 11600 * (The first is measuring). In this phase, each parent calls 11601 * layout on all of its children to position them. 11602 * This is typically done using the child measurements 11603 * that were stored in the measure pass().</p> 11604 * 11605 * <p>Derived classes should not override this method. 11606 * Derived classes with children should override 11607 * onLayout. In that method, they should 11608 * call layout on each of their children.</p> 11609 * 11610 * @param l Left position, relative to parent 11611 * @param t Top position, relative to parent 11612 * @param r Right position, relative to parent 11613 * @param b Bottom position, relative to parent 11614 */ 11615 @SuppressWarnings({"unchecked"}) 11616 public void layout(int l, int t, int r, int b) { 11617 int oldL = mLeft; 11618 int oldT = mTop; 11619 int oldB = mBottom; 11620 int oldR = mRight; 11621 boolean changed = setFrame(l, t, r, b); 11622 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 11623 if (ViewDebug.TRACE_HIERARCHY) { 11624 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 11625 } 11626 11627 onLayout(changed, l, t, r, b); 11628 mPrivateFlags &= ~LAYOUT_REQUIRED; 11629 11630 ListenerInfo li = mListenerInfo; 11631 if (li != null && li.mOnLayoutChangeListeners != null) { 11632 ArrayList<OnLayoutChangeListener> listenersCopy = 11633 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 11634 int numListeners = listenersCopy.size(); 11635 for (int i = 0; i < numListeners; ++i) { 11636 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 11637 } 11638 } 11639 } 11640 mPrivateFlags &= ~FORCE_LAYOUT; 11641 } 11642 11643 /** 11644 * Called from layout when this view should 11645 * assign a size and position to each of its children. 11646 * 11647 * Derived classes with children should override 11648 * this method and call layout on each of 11649 * their children. 11650 * @param changed This is a new size or position for this view 11651 * @param left Left position, relative to parent 11652 * @param top Top position, relative to parent 11653 * @param right Right position, relative to parent 11654 * @param bottom Bottom position, relative to parent 11655 */ 11656 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 11657 } 11658 11659 /** 11660 * Assign a size and position to this view. 11661 * 11662 * This is called from layout. 11663 * 11664 * @param left Left position, relative to parent 11665 * @param top Top position, relative to parent 11666 * @param right Right position, relative to parent 11667 * @param bottom Bottom position, relative to parent 11668 * @return true if the new size and position are different than the 11669 * previous ones 11670 * {@hide} 11671 */ 11672 protected boolean setFrame(int left, int top, int right, int bottom) { 11673 boolean changed = false; 11674 11675 if (DBG) { 11676 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 11677 + right + "," + bottom + ")"); 11678 } 11679 11680 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 11681 changed = true; 11682 11683 // Remember our drawn bit 11684 int drawn = mPrivateFlags & DRAWN; 11685 11686 int oldWidth = mRight - mLeft; 11687 int oldHeight = mBottom - mTop; 11688 int newWidth = right - left; 11689 int newHeight = bottom - top; 11690 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 11691 11692 // Invalidate our old position 11693 invalidate(sizeChanged); 11694 11695 mLeft = left; 11696 mTop = top; 11697 mRight = right; 11698 mBottom = bottom; 11699 11700 mPrivateFlags |= HAS_BOUNDS; 11701 11702 11703 if (sizeChanged) { 11704 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 11705 // A change in dimension means an auto-centered pivot point changes, too 11706 if (mTransformationInfo != null) { 11707 mTransformationInfo.mMatrixDirty = true; 11708 } 11709 } 11710 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 11711 } 11712 11713 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 11714 // If we are visible, force the DRAWN bit to on so that 11715 // this invalidate will go through (at least to our parent). 11716 // This is because someone may have invalidated this view 11717 // before this call to setFrame came in, thereby clearing 11718 // the DRAWN bit. 11719 mPrivateFlags |= DRAWN; 11720 invalidate(sizeChanged); 11721 // parent display list may need to be recreated based on a change in the bounds 11722 // of any child 11723 invalidateParentCaches(); 11724 } 11725 11726 // Reset drawn bit to original value (invalidate turns it off) 11727 mPrivateFlags |= drawn; 11728 11729 mBackgroundSizeChanged = true; 11730 } 11731 return changed; 11732 } 11733 11734 /** 11735 * Finalize inflating a view from XML. This is called as the last phase 11736 * of inflation, after all child views have been added. 11737 * 11738 * <p>Even if the subclass overrides onFinishInflate, they should always be 11739 * sure to call the super method, so that we get called. 11740 */ 11741 protected void onFinishInflate() { 11742 } 11743 11744 /** 11745 * Returns the resources associated with this view. 11746 * 11747 * @return Resources object. 11748 */ 11749 public Resources getResources() { 11750 return mResources; 11751 } 11752 11753 /** 11754 * Invalidates the specified Drawable. 11755 * 11756 * @param drawable the drawable to invalidate 11757 */ 11758 public void invalidateDrawable(Drawable drawable) { 11759 if (verifyDrawable(drawable)) { 11760 final Rect dirty = drawable.getBounds(); 11761 final int scrollX = mScrollX; 11762 final int scrollY = mScrollY; 11763 11764 invalidate(dirty.left + scrollX, dirty.top + scrollY, 11765 dirty.right + scrollX, dirty.bottom + scrollY); 11766 } 11767 } 11768 11769 /** 11770 * Schedules an action on a drawable to occur at a specified time. 11771 * 11772 * @param who the recipient of the action 11773 * @param what the action to run on the drawable 11774 * @param when the time at which the action must occur. Uses the 11775 * {@link SystemClock#uptimeMillis} timebase. 11776 */ 11777 public void scheduleDrawable(Drawable who, Runnable what, long when) { 11778 if (verifyDrawable(who) && what != null) { 11779 if (mAttachInfo != null) { 11780 mAttachInfo.mHandler.postAtTime(what, who, when); 11781 } else { 11782 ViewRootImpl.getRunQueue().postDelayed(what, when - SystemClock.uptimeMillis()); 11783 } 11784 } 11785 } 11786 11787 /** 11788 * Cancels a scheduled action on a drawable. 11789 * 11790 * @param who the recipient of the action 11791 * @param what the action to cancel 11792 */ 11793 public void unscheduleDrawable(Drawable who, Runnable what) { 11794 if (verifyDrawable(who) && what != null) { 11795 if (mAttachInfo != null) { 11796 mAttachInfo.mHandler.removeCallbacks(what, who); 11797 } else { 11798 ViewRootImpl.getRunQueue().removeCallbacks(what); 11799 } 11800 } 11801 } 11802 11803 /** 11804 * Unschedule any events associated with the given Drawable. This can be 11805 * used when selecting a new Drawable into a view, so that the previous 11806 * one is completely unscheduled. 11807 * 11808 * @param who The Drawable to unschedule. 11809 * 11810 * @see #drawableStateChanged 11811 */ 11812 public void unscheduleDrawable(Drawable who) { 11813 if (mAttachInfo != null) { 11814 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 11815 } 11816 } 11817 11818 /** 11819 * Return the layout direction of a given Drawable. 11820 * 11821 * @param who the Drawable to query 11822 * 11823 * @hide 11824 */ 11825 public int getResolvedLayoutDirection(Drawable who) { 11826 return (who == mBGDrawable) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 11827 } 11828 11829 /** 11830 * If your view subclass is displaying its own Drawable objects, it should 11831 * override this function and return true for any Drawable it is 11832 * displaying. This allows animations for those drawables to be 11833 * scheduled. 11834 * 11835 * <p>Be sure to call through to the super class when overriding this 11836 * function. 11837 * 11838 * @param who The Drawable to verify. Return true if it is one you are 11839 * displaying, else return the result of calling through to the 11840 * super class. 11841 * 11842 * @return boolean If true than the Drawable is being displayed in the 11843 * view; else false and it is not allowed to animate. 11844 * 11845 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 11846 * @see #drawableStateChanged() 11847 */ 11848 protected boolean verifyDrawable(Drawable who) { 11849 return who == mBGDrawable; 11850 } 11851 11852 /** 11853 * This function is called whenever the state of the view changes in such 11854 * a way that it impacts the state of drawables being shown. 11855 * 11856 * <p>Be sure to call through to the superclass when overriding this 11857 * function. 11858 * 11859 * @see Drawable#setState(int[]) 11860 */ 11861 protected void drawableStateChanged() { 11862 Drawable d = mBGDrawable; 11863 if (d != null && d.isStateful()) { 11864 d.setState(getDrawableState()); 11865 } 11866 } 11867 11868 /** 11869 * Call this to force a view to update its drawable state. This will cause 11870 * drawableStateChanged to be called on this view. Views that are interested 11871 * in the new state should call getDrawableState. 11872 * 11873 * @see #drawableStateChanged 11874 * @see #getDrawableState 11875 */ 11876 public void refreshDrawableState() { 11877 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11878 drawableStateChanged(); 11879 11880 ViewParent parent = mParent; 11881 if (parent != null) { 11882 parent.childDrawableStateChanged(this); 11883 } 11884 } 11885 11886 /** 11887 * Return an array of resource IDs of the drawable states representing the 11888 * current state of the view. 11889 * 11890 * @return The current drawable state 11891 * 11892 * @see Drawable#setState(int[]) 11893 * @see #drawableStateChanged() 11894 * @see #onCreateDrawableState(int) 11895 */ 11896 public final int[] getDrawableState() { 11897 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 11898 return mDrawableState; 11899 } else { 11900 mDrawableState = onCreateDrawableState(0); 11901 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 11902 return mDrawableState; 11903 } 11904 } 11905 11906 /** 11907 * Generate the new {@link android.graphics.drawable.Drawable} state for 11908 * this view. This is called by the view 11909 * system when the cached Drawable state is determined to be invalid. To 11910 * retrieve the current state, you should use {@link #getDrawableState}. 11911 * 11912 * @param extraSpace if non-zero, this is the number of extra entries you 11913 * would like in the returned array in which you can place your own 11914 * states. 11915 * 11916 * @return Returns an array holding the current {@link Drawable} state of 11917 * the view. 11918 * 11919 * @see #mergeDrawableStates(int[], int[]) 11920 */ 11921 protected int[] onCreateDrawableState(int extraSpace) { 11922 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 11923 mParent instanceof View) { 11924 return ((View) mParent).onCreateDrawableState(extraSpace); 11925 } 11926 11927 int[] drawableState; 11928 11929 int privateFlags = mPrivateFlags; 11930 11931 int viewStateIndex = 0; 11932 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 11933 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 11934 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 11935 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 11936 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 11937 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 11938 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 11939 HardwareRenderer.isAvailable()) { 11940 // This is set if HW acceleration is requested, even if the current 11941 // process doesn't allow it. This is just to allow app preview 11942 // windows to better match their app. 11943 viewStateIndex |= VIEW_STATE_ACCELERATED; 11944 } 11945 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 11946 11947 final int privateFlags2 = mPrivateFlags2; 11948 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 11949 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 11950 11951 drawableState = VIEW_STATE_SETS[viewStateIndex]; 11952 11953 //noinspection ConstantIfStatement 11954 if (false) { 11955 Log.i("View", "drawableStateIndex=" + viewStateIndex); 11956 Log.i("View", toString() 11957 + " pressed=" + ((privateFlags & PRESSED) != 0) 11958 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 11959 + " fo=" + hasFocus() 11960 + " sl=" + ((privateFlags & SELECTED) != 0) 11961 + " wf=" + hasWindowFocus() 11962 + ": " + Arrays.toString(drawableState)); 11963 } 11964 11965 if (extraSpace == 0) { 11966 return drawableState; 11967 } 11968 11969 final int[] fullState; 11970 if (drawableState != null) { 11971 fullState = new int[drawableState.length + extraSpace]; 11972 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 11973 } else { 11974 fullState = new int[extraSpace]; 11975 } 11976 11977 return fullState; 11978 } 11979 11980 /** 11981 * Merge your own state values in <var>additionalState</var> into the base 11982 * state values <var>baseState</var> that were returned by 11983 * {@link #onCreateDrawableState(int)}. 11984 * 11985 * @param baseState The base state values returned by 11986 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 11987 * own additional state values. 11988 * 11989 * @param additionalState The additional state values you would like 11990 * added to <var>baseState</var>; this array is not modified. 11991 * 11992 * @return As a convenience, the <var>baseState</var> array you originally 11993 * passed into the function is returned. 11994 * 11995 * @see #onCreateDrawableState(int) 11996 */ 11997 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 11998 final int N = baseState.length; 11999 int i = N - 1; 12000 while (i >= 0 && baseState[i] == 0) { 12001 i--; 12002 } 12003 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 12004 return baseState; 12005 } 12006 12007 /** 12008 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 12009 * on all Drawable objects associated with this view. 12010 */ 12011 public void jumpDrawablesToCurrentState() { 12012 if (mBGDrawable != null) { 12013 mBGDrawable.jumpToCurrentState(); 12014 } 12015 } 12016 12017 /** 12018 * Sets the background color for this view. 12019 * @param color the color of the background 12020 */ 12021 @RemotableViewMethod 12022 public void setBackgroundColor(int color) { 12023 if (mBGDrawable instanceof ColorDrawable) { 12024 ((ColorDrawable) mBGDrawable).setColor(color); 12025 } else { 12026 setBackgroundDrawable(new ColorDrawable(color)); 12027 } 12028 } 12029 12030 /** 12031 * Set the background to a given resource. The resource should refer to 12032 * a Drawable object or 0 to remove the background. 12033 * @param resid The identifier of the resource. 12034 * @attr ref android.R.styleable#View_background 12035 */ 12036 @RemotableViewMethod 12037 public void setBackgroundResource(int resid) { 12038 if (resid != 0 && resid == mBackgroundResource) { 12039 return; 12040 } 12041 12042 Drawable d= null; 12043 if (resid != 0) { 12044 d = mResources.getDrawable(resid); 12045 } 12046 setBackgroundDrawable(d); 12047 12048 mBackgroundResource = resid; 12049 } 12050 12051 /** 12052 * Set the background to a given Drawable, or remove the background. If the 12053 * background has padding, this View's padding is set to the background's 12054 * padding. However, when a background is removed, this View's padding isn't 12055 * touched. If setting the padding is desired, please use 12056 * {@link #setPadding(int, int, int, int)}. 12057 * 12058 * @param d The Drawable to use as the background, or null to remove the 12059 * background 12060 */ 12061 public void setBackgroundDrawable(Drawable d) { 12062 if (d == mBGDrawable) { 12063 return; 12064 } 12065 12066 boolean requestLayout = false; 12067 12068 mBackgroundResource = 0; 12069 12070 /* 12071 * Regardless of whether we're setting a new background or not, we want 12072 * to clear the previous drawable. 12073 */ 12074 if (mBGDrawable != null) { 12075 mBGDrawable.setCallback(null); 12076 unscheduleDrawable(mBGDrawable); 12077 } 12078 12079 if (d != null) { 12080 Rect padding = sThreadLocal.get(); 12081 if (padding == null) { 12082 padding = new Rect(); 12083 sThreadLocal.set(padding); 12084 } 12085 if (d.getPadding(padding)) { 12086 switch (d.getResolvedLayoutDirectionSelf()) { 12087 case LAYOUT_DIRECTION_RTL: 12088 setPadding(padding.right, padding.top, padding.left, padding.bottom); 12089 break; 12090 case LAYOUT_DIRECTION_LTR: 12091 default: 12092 setPadding(padding.left, padding.top, padding.right, padding.bottom); 12093 } 12094 } 12095 12096 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 12097 // if it has a different minimum size, we should layout again 12098 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 12099 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 12100 requestLayout = true; 12101 } 12102 12103 d.setCallback(this); 12104 if (d.isStateful()) { 12105 d.setState(getDrawableState()); 12106 } 12107 d.setVisible(getVisibility() == VISIBLE, false); 12108 mBGDrawable = d; 12109 12110 if ((mPrivateFlags & SKIP_DRAW) != 0) { 12111 mPrivateFlags &= ~SKIP_DRAW; 12112 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 12113 requestLayout = true; 12114 } 12115 } else { 12116 /* Remove the background */ 12117 mBGDrawable = null; 12118 12119 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 12120 /* 12121 * This view ONLY drew the background before and we're removing 12122 * the background, so now it won't draw anything 12123 * (hence we SKIP_DRAW) 12124 */ 12125 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 12126 mPrivateFlags |= SKIP_DRAW; 12127 } 12128 12129 /* 12130 * When the background is set, we try to apply its padding to this 12131 * View. When the background is removed, we don't touch this View's 12132 * padding. This is noted in the Javadocs. Hence, we don't need to 12133 * requestLayout(), the invalidate() below is sufficient. 12134 */ 12135 12136 // The old background's minimum size could have affected this 12137 // View's layout, so let's requestLayout 12138 requestLayout = true; 12139 } 12140 12141 computeOpaqueFlags(); 12142 12143 if (requestLayout) { 12144 requestLayout(); 12145 } 12146 12147 mBackgroundSizeChanged = true; 12148 invalidate(true); 12149 } 12150 12151 /** 12152 * Gets the background drawable 12153 * @return The drawable used as the background for this view, if any. 12154 */ 12155 public Drawable getBackground() { 12156 return mBGDrawable; 12157 } 12158 12159 /** 12160 * Sets the padding. The view may add on the space required to display 12161 * the scrollbars, depending on the style and visibility of the scrollbars. 12162 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 12163 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 12164 * from the values set in this call. 12165 * 12166 * @attr ref android.R.styleable#View_padding 12167 * @attr ref android.R.styleable#View_paddingBottom 12168 * @attr ref android.R.styleable#View_paddingLeft 12169 * @attr ref android.R.styleable#View_paddingRight 12170 * @attr ref android.R.styleable#View_paddingTop 12171 * @param left the left padding in pixels 12172 * @param top the top padding in pixels 12173 * @param right the right padding in pixels 12174 * @param bottom the bottom padding in pixels 12175 */ 12176 public void setPadding(int left, int top, int right, int bottom) { 12177 boolean changed = false; 12178 12179 mUserPaddingRelative = false; 12180 12181 mUserPaddingLeft = left; 12182 mUserPaddingRight = right; 12183 mUserPaddingBottom = bottom; 12184 12185 final int viewFlags = mViewFlags; 12186 12187 // Common case is there are no scroll bars. 12188 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 12189 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 12190 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 12191 ? 0 : getVerticalScrollbarWidth(); 12192 switch (mVerticalScrollbarPosition) { 12193 case SCROLLBAR_POSITION_DEFAULT: 12194 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 12195 left += offset; 12196 } else { 12197 right += offset; 12198 } 12199 break; 12200 case SCROLLBAR_POSITION_RIGHT: 12201 right += offset; 12202 break; 12203 case SCROLLBAR_POSITION_LEFT: 12204 left += offset; 12205 break; 12206 } 12207 } 12208 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 12209 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 12210 ? 0 : getHorizontalScrollbarHeight(); 12211 } 12212 } 12213 12214 if (mPaddingLeft != left) { 12215 changed = true; 12216 mPaddingLeft = left; 12217 } 12218 if (mPaddingTop != top) { 12219 changed = true; 12220 mPaddingTop = top; 12221 } 12222 if (mPaddingRight != right) { 12223 changed = true; 12224 mPaddingRight = right; 12225 } 12226 if (mPaddingBottom != bottom) { 12227 changed = true; 12228 mPaddingBottom = bottom; 12229 } 12230 12231 if (changed) { 12232 requestLayout(); 12233 } 12234 } 12235 12236 /** 12237 * Sets the relative padding. The view may add on the space required to display 12238 * the scrollbars, depending on the style and visibility of the scrollbars. 12239 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 12240 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 12241 * from the values set in this call. 12242 * 12243 * @attr ref android.R.styleable#View_padding 12244 * @attr ref android.R.styleable#View_paddingBottom 12245 * @attr ref android.R.styleable#View_paddingStart 12246 * @attr ref android.R.styleable#View_paddingEnd 12247 * @attr ref android.R.styleable#View_paddingTop 12248 * @param start the start padding in pixels 12249 * @param top the top padding in pixels 12250 * @param end the end padding in pixels 12251 * @param bottom the bottom padding in pixels 12252 */ 12253 public void setPaddingRelative(int start, int top, int end, int bottom) { 12254 mUserPaddingRelative = true; 12255 12256 mUserPaddingStart = start; 12257 mUserPaddingEnd = end; 12258 12259 switch(getResolvedLayoutDirection()) { 12260 case LAYOUT_DIRECTION_RTL: 12261 setPadding(end, top, start, bottom); 12262 break; 12263 case LAYOUT_DIRECTION_LTR: 12264 default: 12265 setPadding(start, top, end, bottom); 12266 } 12267 } 12268 12269 /** 12270 * Returns the top padding of this view. 12271 * 12272 * @return the top padding in pixels 12273 */ 12274 public int getPaddingTop() { 12275 return mPaddingTop; 12276 } 12277 12278 /** 12279 * Returns the bottom padding of this view. If there are inset and enabled 12280 * scrollbars, this value may include the space required to display the 12281 * scrollbars as well. 12282 * 12283 * @return the bottom padding in pixels 12284 */ 12285 public int getPaddingBottom() { 12286 return mPaddingBottom; 12287 } 12288 12289 /** 12290 * Returns the left padding of this view. If there are inset and enabled 12291 * scrollbars, this value may include the space required to display the 12292 * scrollbars as well. 12293 * 12294 * @return the left padding in pixels 12295 */ 12296 public int getPaddingLeft() { 12297 return mPaddingLeft; 12298 } 12299 12300 /** 12301 * Returns the start padding of this view. If there are inset and enabled 12302 * scrollbars, this value may include the space required to display the 12303 * scrollbars as well. 12304 * 12305 * @return the start padding in pixels 12306 */ 12307 public int getPaddingStart() { 12308 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 12309 mPaddingRight : mPaddingLeft; 12310 } 12311 12312 /** 12313 * Returns the right padding of this view. If there are inset and enabled 12314 * scrollbars, this value may include the space required to display the 12315 * scrollbars as well. 12316 * 12317 * @return the right padding in pixels 12318 */ 12319 public int getPaddingRight() { 12320 return mPaddingRight; 12321 } 12322 12323 /** 12324 * Returns the end padding of this view. If there are inset and enabled 12325 * scrollbars, this value may include the space required to display the 12326 * scrollbars as well. 12327 * 12328 * @return the end padding in pixels 12329 */ 12330 public int getPaddingEnd() { 12331 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 12332 mPaddingLeft : mPaddingRight; 12333 } 12334 12335 /** 12336 * Return if the padding as been set thru relative values 12337 * {@link #setPaddingRelative(int, int, int, int)} or thru 12338 * @attr ref android.R.styleable#View_paddingStart or 12339 * @attr ref android.R.styleable#View_paddingEnd 12340 * 12341 * @return true if the padding is relative or false if it is not. 12342 */ 12343 public boolean isPaddingRelative() { 12344 return mUserPaddingRelative; 12345 } 12346 12347 /** 12348 * Changes the selection state of this view. A view can be selected or not. 12349 * Note that selection is not the same as focus. Views are typically 12350 * selected in the context of an AdapterView like ListView or GridView; 12351 * the selected view is the view that is highlighted. 12352 * 12353 * @param selected true if the view must be selected, false otherwise 12354 */ 12355 public void setSelected(boolean selected) { 12356 if (((mPrivateFlags & SELECTED) != 0) != selected) { 12357 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 12358 if (!selected) resetPressedState(); 12359 invalidate(true); 12360 refreshDrawableState(); 12361 dispatchSetSelected(selected); 12362 } 12363 } 12364 12365 /** 12366 * Dispatch setSelected to all of this View's children. 12367 * 12368 * @see #setSelected(boolean) 12369 * 12370 * @param selected The new selected state 12371 */ 12372 protected void dispatchSetSelected(boolean selected) { 12373 } 12374 12375 /** 12376 * Indicates the selection state of this view. 12377 * 12378 * @return true if the view is selected, false otherwise 12379 */ 12380 @ViewDebug.ExportedProperty 12381 public boolean isSelected() { 12382 return (mPrivateFlags & SELECTED) != 0; 12383 } 12384 12385 /** 12386 * Changes the activated state of this view. A view can be activated or not. 12387 * Note that activation is not the same as selection. Selection is 12388 * a transient property, representing the view (hierarchy) the user is 12389 * currently interacting with. Activation is a longer-term state that the 12390 * user can move views in and out of. For example, in a list view with 12391 * single or multiple selection enabled, the views in the current selection 12392 * set are activated. (Um, yeah, we are deeply sorry about the terminology 12393 * here.) The activated state is propagated down to children of the view it 12394 * is set on. 12395 * 12396 * @param activated true if the view must be activated, false otherwise 12397 */ 12398 public void setActivated(boolean activated) { 12399 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 12400 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 12401 invalidate(true); 12402 refreshDrawableState(); 12403 dispatchSetActivated(activated); 12404 } 12405 } 12406 12407 /** 12408 * Dispatch setActivated to all of this View's children. 12409 * 12410 * @see #setActivated(boolean) 12411 * 12412 * @param activated The new activated state 12413 */ 12414 protected void dispatchSetActivated(boolean activated) { 12415 } 12416 12417 /** 12418 * Indicates the activation state of this view. 12419 * 12420 * @return true if the view is activated, false otherwise 12421 */ 12422 @ViewDebug.ExportedProperty 12423 public boolean isActivated() { 12424 return (mPrivateFlags & ACTIVATED) != 0; 12425 } 12426 12427 /** 12428 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 12429 * observer can be used to get notifications when global events, like 12430 * layout, happen. 12431 * 12432 * The returned ViewTreeObserver observer is not guaranteed to remain 12433 * valid for the lifetime of this View. If the caller of this method keeps 12434 * a long-lived reference to ViewTreeObserver, it should always check for 12435 * the return value of {@link ViewTreeObserver#isAlive()}. 12436 * 12437 * @return The ViewTreeObserver for this view's hierarchy. 12438 */ 12439 public ViewTreeObserver getViewTreeObserver() { 12440 if (mAttachInfo != null) { 12441 return mAttachInfo.mTreeObserver; 12442 } 12443 if (mFloatingTreeObserver == null) { 12444 mFloatingTreeObserver = new ViewTreeObserver(); 12445 } 12446 return mFloatingTreeObserver; 12447 } 12448 12449 /** 12450 * <p>Finds the topmost view in the current view hierarchy.</p> 12451 * 12452 * @return the topmost view containing this view 12453 */ 12454 public View getRootView() { 12455 if (mAttachInfo != null) { 12456 final View v = mAttachInfo.mRootView; 12457 if (v != null) { 12458 return v; 12459 } 12460 } 12461 12462 View parent = this; 12463 12464 while (parent.mParent != null && parent.mParent instanceof View) { 12465 parent = (View) parent.mParent; 12466 } 12467 12468 return parent; 12469 } 12470 12471 /** 12472 * <p>Computes the coordinates of this view on the screen. The argument 12473 * must be an array of two integers. After the method returns, the array 12474 * contains the x and y location in that order.</p> 12475 * 12476 * @param location an array of two integers in which to hold the coordinates 12477 */ 12478 public void getLocationOnScreen(int[] location) { 12479 getLocationInWindow(location); 12480 12481 final AttachInfo info = mAttachInfo; 12482 if (info != null) { 12483 location[0] += info.mWindowLeft; 12484 location[1] += info.mWindowTop; 12485 } 12486 } 12487 12488 /** 12489 * <p>Computes the coordinates of this view in its window. The argument 12490 * must be an array of two integers. After the method returns, the array 12491 * contains the x and y location in that order.</p> 12492 * 12493 * @param location an array of two integers in which to hold the coordinates 12494 */ 12495 public void getLocationInWindow(int[] location) { 12496 if (location == null || location.length < 2) { 12497 throw new IllegalArgumentException("location must be an array of two integers"); 12498 } 12499 12500 if (mAttachInfo == null) { 12501 // When the view is not attached to a window, this method does not make sense 12502 location[0] = location[1] = 0; 12503 return; 12504 } 12505 12506 float[] position = mAttachInfo.mTmpTransformLocation; 12507 position[0] = position[1] = 0.0f; 12508 12509 if (!hasIdentityMatrix()) { 12510 getMatrix().mapPoints(position); 12511 } 12512 12513 position[0] += mLeft; 12514 position[1] += mTop; 12515 12516 ViewParent viewParent = mParent; 12517 while (viewParent instanceof View) { 12518 final View view = (View) viewParent; 12519 12520 position[0] -= view.mScrollX; 12521 position[1] -= view.mScrollY; 12522 12523 if (!view.hasIdentityMatrix()) { 12524 view.getMatrix().mapPoints(position); 12525 } 12526 12527 position[0] += view.mLeft; 12528 position[1] += view.mTop; 12529 12530 viewParent = view.mParent; 12531 } 12532 12533 if (viewParent instanceof ViewRootImpl) { 12534 // *cough* 12535 final ViewRootImpl vr = (ViewRootImpl) viewParent; 12536 position[1] -= vr.mCurScrollY; 12537 } 12538 12539 location[0] = (int) (position[0] + 0.5f); 12540 location[1] = (int) (position[1] + 0.5f); 12541 } 12542 12543 /** 12544 * {@hide} 12545 * @param id the id of the view to be found 12546 * @return the view of the specified id, null if cannot be found 12547 */ 12548 protected View findViewTraversal(int id) { 12549 if (id == mID) { 12550 return this; 12551 } 12552 return null; 12553 } 12554 12555 /** 12556 * {@hide} 12557 * @param tag the tag of the view to be found 12558 * @return the view of specified tag, null if cannot be found 12559 */ 12560 protected View findViewWithTagTraversal(Object tag) { 12561 if (tag != null && tag.equals(mTag)) { 12562 return this; 12563 } 12564 return null; 12565 } 12566 12567 /** 12568 * {@hide} 12569 * @param predicate The predicate to evaluate. 12570 * @param childToSkip If not null, ignores this child during the recursive traversal. 12571 * @return The first view that matches the predicate or null. 12572 */ 12573 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 12574 if (predicate.apply(this)) { 12575 return this; 12576 } 12577 return null; 12578 } 12579 12580 /** 12581 * Look for a child view with the given id. If this view has the given 12582 * id, return this view. 12583 * 12584 * @param id The id to search for. 12585 * @return The view that has the given id in the hierarchy or null 12586 */ 12587 public final View findViewById(int id) { 12588 if (id < 0) { 12589 return null; 12590 } 12591 return findViewTraversal(id); 12592 } 12593 12594 /** 12595 * Finds a view by its unuque and stable accessibility id. 12596 * 12597 * @param accessibilityId The searched accessibility id. 12598 * @return The found view. 12599 */ 12600 final View findViewByAccessibilityId(int accessibilityId) { 12601 if (accessibilityId < 0) { 12602 return null; 12603 } 12604 return findViewByAccessibilityIdTraversal(accessibilityId); 12605 } 12606 12607 /** 12608 * Performs the traversal to find a view by its unuque and stable accessibility id. 12609 * 12610 * <strong>Note:</strong>This method does not stop at the root namespace 12611 * boundary since the user can touch the screen at an arbitrary location 12612 * potentially crossing the root namespace bounday which will send an 12613 * accessibility event to accessibility services and they should be able 12614 * to obtain the event source. Also accessibility ids are guaranteed to be 12615 * unique in the window. 12616 * 12617 * @param accessibilityId The accessibility id. 12618 * @return The found view. 12619 */ 12620 View findViewByAccessibilityIdTraversal(int accessibilityId) { 12621 if (getAccessibilityViewId() == accessibilityId) { 12622 return this; 12623 } 12624 return null; 12625 } 12626 12627 /** 12628 * Look for a child view with the given tag. If this view has the given 12629 * tag, return this view. 12630 * 12631 * @param tag The tag to search for, using "tag.equals(getTag())". 12632 * @return The View that has the given tag in the hierarchy or null 12633 */ 12634 public final View findViewWithTag(Object tag) { 12635 if (tag == null) { 12636 return null; 12637 } 12638 return findViewWithTagTraversal(tag); 12639 } 12640 12641 /** 12642 * {@hide} 12643 * Look for a child view that matches the specified predicate. 12644 * If this view matches the predicate, return this view. 12645 * 12646 * @param predicate The predicate to evaluate. 12647 * @return The first view that matches the predicate or null. 12648 */ 12649 public final View findViewByPredicate(Predicate<View> predicate) { 12650 return findViewByPredicateTraversal(predicate, null); 12651 } 12652 12653 /** 12654 * {@hide} 12655 * Look for a child view that matches the specified predicate, 12656 * starting with the specified view and its descendents and then 12657 * recusively searching the ancestors and siblings of that view 12658 * until this view is reached. 12659 * 12660 * This method is useful in cases where the predicate does not match 12661 * a single unique view (perhaps multiple views use the same id) 12662 * and we are trying to find the view that is "closest" in scope to the 12663 * starting view. 12664 * 12665 * @param start The view to start from. 12666 * @param predicate The predicate to evaluate. 12667 * @return The first view that matches the predicate or null. 12668 */ 12669 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 12670 View childToSkip = null; 12671 for (;;) { 12672 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 12673 if (view != null || start == this) { 12674 return view; 12675 } 12676 12677 ViewParent parent = start.getParent(); 12678 if (parent == null || !(parent instanceof View)) { 12679 return null; 12680 } 12681 12682 childToSkip = start; 12683 start = (View) parent; 12684 } 12685 } 12686 12687 /** 12688 * Sets the identifier for this view. The identifier does not have to be 12689 * unique in this view's hierarchy. The identifier should be a positive 12690 * number. 12691 * 12692 * @see #NO_ID 12693 * @see #getId() 12694 * @see #findViewById(int) 12695 * 12696 * @param id a number used to identify the view 12697 * 12698 * @attr ref android.R.styleable#View_id 12699 */ 12700 public void setId(int id) { 12701 mID = id; 12702 } 12703 12704 /** 12705 * {@hide} 12706 * 12707 * @param isRoot true if the view belongs to the root namespace, false 12708 * otherwise 12709 */ 12710 public void setIsRootNamespace(boolean isRoot) { 12711 if (isRoot) { 12712 mPrivateFlags |= IS_ROOT_NAMESPACE; 12713 } else { 12714 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 12715 } 12716 } 12717 12718 /** 12719 * {@hide} 12720 * 12721 * @return true if the view belongs to the root namespace, false otherwise 12722 */ 12723 public boolean isRootNamespace() { 12724 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 12725 } 12726 12727 /** 12728 * Returns this view's identifier. 12729 * 12730 * @return a positive integer used to identify the view or {@link #NO_ID} 12731 * if the view has no ID 12732 * 12733 * @see #setId(int) 12734 * @see #findViewById(int) 12735 * @attr ref android.R.styleable#View_id 12736 */ 12737 @ViewDebug.CapturedViewProperty 12738 public int getId() { 12739 return mID; 12740 } 12741 12742 /** 12743 * Returns this view's tag. 12744 * 12745 * @return the Object stored in this view as a tag 12746 * 12747 * @see #setTag(Object) 12748 * @see #getTag(int) 12749 */ 12750 @ViewDebug.ExportedProperty 12751 public Object getTag() { 12752 return mTag; 12753 } 12754 12755 /** 12756 * Sets the tag associated with this view. A tag can be used to mark 12757 * a view in its hierarchy and does not have to be unique within the 12758 * hierarchy. Tags can also be used to store data within a view without 12759 * resorting to another data structure. 12760 * 12761 * @param tag an Object to tag the view with 12762 * 12763 * @see #getTag() 12764 * @see #setTag(int, Object) 12765 */ 12766 public void setTag(final Object tag) { 12767 mTag = tag; 12768 } 12769 12770 /** 12771 * Returns the tag associated with this view and the specified key. 12772 * 12773 * @param key The key identifying the tag 12774 * 12775 * @return the Object stored in this view as a tag 12776 * 12777 * @see #setTag(int, Object) 12778 * @see #getTag() 12779 */ 12780 public Object getTag(int key) { 12781 if (mKeyedTags != null) return mKeyedTags.get(key); 12782 return null; 12783 } 12784 12785 /** 12786 * Sets a tag associated with this view and a key. A tag can be used 12787 * to mark a view in its hierarchy and does not have to be unique within 12788 * the hierarchy. Tags can also be used to store data within a view 12789 * without resorting to another data structure. 12790 * 12791 * The specified key should be an id declared in the resources of the 12792 * application to ensure it is unique (see the <a 12793 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 12794 * Keys identified as belonging to 12795 * the Android framework or not associated with any package will cause 12796 * an {@link IllegalArgumentException} to be thrown. 12797 * 12798 * @param key The key identifying the tag 12799 * @param tag An Object to tag the view with 12800 * 12801 * @throws IllegalArgumentException If they specified key is not valid 12802 * 12803 * @see #setTag(Object) 12804 * @see #getTag(int) 12805 */ 12806 public void setTag(int key, final Object tag) { 12807 // If the package id is 0x00 or 0x01, it's either an undefined package 12808 // or a framework id 12809 if ((key >>> 24) < 2) { 12810 throw new IllegalArgumentException("The key must be an application-specific " 12811 + "resource id."); 12812 } 12813 12814 setKeyedTag(key, tag); 12815 } 12816 12817 /** 12818 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 12819 * framework id. 12820 * 12821 * @hide 12822 */ 12823 public void setTagInternal(int key, Object tag) { 12824 if ((key >>> 24) != 0x1) { 12825 throw new IllegalArgumentException("The key must be a framework-specific " 12826 + "resource id."); 12827 } 12828 12829 setKeyedTag(key, tag); 12830 } 12831 12832 private void setKeyedTag(int key, Object tag) { 12833 if (mKeyedTags == null) { 12834 mKeyedTags = new SparseArray<Object>(); 12835 } 12836 12837 mKeyedTags.put(key, tag); 12838 } 12839 12840 /** 12841 * @param consistency The type of consistency. See ViewDebug for more information. 12842 * 12843 * @hide 12844 */ 12845 protected boolean dispatchConsistencyCheck(int consistency) { 12846 return onConsistencyCheck(consistency); 12847 } 12848 12849 /** 12850 * Method that subclasses should implement to check their consistency. The type of 12851 * consistency check is indicated by the bit field passed as a parameter. 12852 * 12853 * @param consistency The type of consistency. See ViewDebug for more information. 12854 * 12855 * @throws IllegalStateException if the view is in an inconsistent state. 12856 * 12857 * @hide 12858 */ 12859 protected boolean onConsistencyCheck(int consistency) { 12860 boolean result = true; 12861 12862 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 12863 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 12864 12865 if (checkLayout) { 12866 if (getParent() == null) { 12867 result = false; 12868 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12869 "View " + this + " does not have a parent."); 12870 } 12871 12872 if (mAttachInfo == null) { 12873 result = false; 12874 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12875 "View " + this + " is not attached to a window."); 12876 } 12877 } 12878 12879 if (checkDrawing) { 12880 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 12881 // from their draw() method 12882 12883 if ((mPrivateFlags & DRAWN) != DRAWN && 12884 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 12885 result = false; 12886 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12887 "View " + this + " was invalidated but its drawing cache is valid."); 12888 } 12889 } 12890 12891 return result; 12892 } 12893 12894 /** 12895 * Prints information about this view in the log output, with the tag 12896 * {@link #VIEW_LOG_TAG}. 12897 * 12898 * @hide 12899 */ 12900 public void debug() { 12901 debug(0); 12902 } 12903 12904 /** 12905 * Prints information about this view in the log output, with the tag 12906 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 12907 * indentation defined by the <code>depth</code>. 12908 * 12909 * @param depth the indentation level 12910 * 12911 * @hide 12912 */ 12913 protected void debug(int depth) { 12914 String output = debugIndent(depth - 1); 12915 12916 output += "+ " + this; 12917 int id = getId(); 12918 if (id != -1) { 12919 output += " (id=" + id + ")"; 12920 } 12921 Object tag = getTag(); 12922 if (tag != null) { 12923 output += " (tag=" + tag + ")"; 12924 } 12925 Log.d(VIEW_LOG_TAG, output); 12926 12927 if ((mPrivateFlags & FOCUSED) != 0) { 12928 output = debugIndent(depth) + " FOCUSED"; 12929 Log.d(VIEW_LOG_TAG, output); 12930 } 12931 12932 output = debugIndent(depth); 12933 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 12934 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 12935 + "} "; 12936 Log.d(VIEW_LOG_TAG, output); 12937 12938 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 12939 || mPaddingBottom != 0) { 12940 output = debugIndent(depth); 12941 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 12942 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 12943 Log.d(VIEW_LOG_TAG, output); 12944 } 12945 12946 output = debugIndent(depth); 12947 output += "mMeasureWidth=" + mMeasuredWidth + 12948 " mMeasureHeight=" + mMeasuredHeight; 12949 Log.d(VIEW_LOG_TAG, output); 12950 12951 output = debugIndent(depth); 12952 if (mLayoutParams == null) { 12953 output += "BAD! no layout params"; 12954 } else { 12955 output = mLayoutParams.debug(output); 12956 } 12957 Log.d(VIEW_LOG_TAG, output); 12958 12959 output = debugIndent(depth); 12960 output += "flags={"; 12961 output += View.printFlags(mViewFlags); 12962 output += "}"; 12963 Log.d(VIEW_LOG_TAG, output); 12964 12965 output = debugIndent(depth); 12966 output += "privateFlags={"; 12967 output += View.printPrivateFlags(mPrivateFlags); 12968 output += "}"; 12969 Log.d(VIEW_LOG_TAG, output); 12970 } 12971 12972 /** 12973 * Creates an string of whitespaces used for indentation. 12974 * 12975 * @param depth the indentation level 12976 * @return a String containing (depth * 2 + 3) * 2 white spaces 12977 * 12978 * @hide 12979 */ 12980 protected static String debugIndent(int depth) { 12981 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 12982 for (int i = 0; i < (depth * 2) + 3; i++) { 12983 spaces.append(' ').append(' '); 12984 } 12985 return spaces.toString(); 12986 } 12987 12988 /** 12989 * <p>Return the offset of the widget's text baseline from the widget's top 12990 * boundary. If this widget does not support baseline alignment, this 12991 * method returns -1. </p> 12992 * 12993 * @return the offset of the baseline within the widget's bounds or -1 12994 * if baseline alignment is not supported 12995 */ 12996 @ViewDebug.ExportedProperty(category = "layout") 12997 public int getBaseline() { 12998 return -1; 12999 } 13000 13001 /** 13002 * Call this when something has changed which has invalidated the 13003 * layout of this view. This will schedule a layout pass of the view 13004 * tree. 13005 */ 13006 public void requestLayout() { 13007 if (ViewDebug.TRACE_HIERARCHY) { 13008 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 13009 } 13010 13011 if (getAccessibilityNodeProvider() != null) { 13012 throw new IllegalStateException("Views with AccessibilityNodeProvider" 13013 + " can't have children."); 13014 } 13015 13016 mPrivateFlags |= FORCE_LAYOUT; 13017 mPrivateFlags |= INVALIDATED; 13018 13019 if (mParent != null) { 13020 if (mLayoutParams != null) { 13021 mLayoutParams.resolveWithDirection(getResolvedLayoutDirection()); 13022 } 13023 if (!mParent.isLayoutRequested()) { 13024 mParent.requestLayout(); 13025 } 13026 } 13027 } 13028 13029 /** 13030 * Forces this view to be laid out during the next layout pass. 13031 * This method does not call requestLayout() or forceLayout() 13032 * on the parent. 13033 */ 13034 public void forceLayout() { 13035 mPrivateFlags |= FORCE_LAYOUT; 13036 mPrivateFlags |= INVALIDATED; 13037 } 13038 13039 /** 13040 * <p> 13041 * This is called to find out how big a view should be. The parent 13042 * supplies constraint information in the width and height parameters. 13043 * </p> 13044 * 13045 * <p> 13046 * The actual measurement work of a view is performed in 13047 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 13048 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 13049 * </p> 13050 * 13051 * 13052 * @param widthMeasureSpec Horizontal space requirements as imposed by the 13053 * parent 13054 * @param heightMeasureSpec Vertical space requirements as imposed by the 13055 * parent 13056 * 13057 * @see #onMeasure(int, int) 13058 */ 13059 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 13060 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 13061 widthMeasureSpec != mOldWidthMeasureSpec || 13062 heightMeasureSpec != mOldHeightMeasureSpec) { 13063 13064 // first clears the measured dimension flag 13065 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 13066 13067 if (ViewDebug.TRACE_HIERARCHY) { 13068 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 13069 } 13070 13071 // measure ourselves, this should set the measured dimension flag back 13072 onMeasure(widthMeasureSpec, heightMeasureSpec); 13073 13074 // flag not set, setMeasuredDimension() was not invoked, we raise 13075 // an exception to warn the developer 13076 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 13077 throw new IllegalStateException("onMeasure() did not set the" 13078 + " measured dimension by calling" 13079 + " setMeasuredDimension()"); 13080 } 13081 13082 mPrivateFlags |= LAYOUT_REQUIRED; 13083 } 13084 13085 mOldWidthMeasureSpec = widthMeasureSpec; 13086 mOldHeightMeasureSpec = heightMeasureSpec; 13087 } 13088 13089 /** 13090 * <p> 13091 * Measure the view and its content to determine the measured width and the 13092 * measured height. This method is invoked by {@link #measure(int, int)} and 13093 * should be overriden by subclasses to provide accurate and efficient 13094 * measurement of their contents. 13095 * </p> 13096 * 13097 * <p> 13098 * <strong>CONTRACT:</strong> When overriding this method, you 13099 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 13100 * measured width and height of this view. Failure to do so will trigger an 13101 * <code>IllegalStateException</code>, thrown by 13102 * {@link #measure(int, int)}. Calling the superclass' 13103 * {@link #onMeasure(int, int)} is a valid use. 13104 * </p> 13105 * 13106 * <p> 13107 * The base class implementation of measure defaults to the background size, 13108 * unless a larger size is allowed by the MeasureSpec. Subclasses should 13109 * override {@link #onMeasure(int, int)} to provide better measurements of 13110 * their content. 13111 * </p> 13112 * 13113 * <p> 13114 * If this method is overridden, it is the subclass's responsibility to make 13115 * sure the measured height and width are at least the view's minimum height 13116 * and width ({@link #getSuggestedMinimumHeight()} and 13117 * {@link #getSuggestedMinimumWidth()}). 13118 * </p> 13119 * 13120 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 13121 * The requirements are encoded with 13122 * {@link android.view.View.MeasureSpec}. 13123 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 13124 * The requirements are encoded with 13125 * {@link android.view.View.MeasureSpec}. 13126 * 13127 * @see #getMeasuredWidth() 13128 * @see #getMeasuredHeight() 13129 * @see #setMeasuredDimension(int, int) 13130 * @see #getSuggestedMinimumHeight() 13131 * @see #getSuggestedMinimumWidth() 13132 * @see android.view.View.MeasureSpec#getMode(int) 13133 * @see android.view.View.MeasureSpec#getSize(int) 13134 */ 13135 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 13136 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 13137 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 13138 } 13139 13140 /** 13141 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 13142 * measured width and measured height. Failing to do so will trigger an 13143 * exception at measurement time.</p> 13144 * 13145 * @param measuredWidth The measured width of this view. May be a complex 13146 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 13147 * {@link #MEASURED_STATE_TOO_SMALL}. 13148 * @param measuredHeight The measured height of this view. May be a complex 13149 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 13150 * {@link #MEASURED_STATE_TOO_SMALL}. 13151 */ 13152 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 13153 mMeasuredWidth = measuredWidth; 13154 mMeasuredHeight = measuredHeight; 13155 13156 mPrivateFlags |= MEASURED_DIMENSION_SET; 13157 } 13158 13159 /** 13160 * Merge two states as returned by {@link #getMeasuredState()}. 13161 * @param curState The current state as returned from a view or the result 13162 * of combining multiple views. 13163 * @param newState The new view state to combine. 13164 * @return Returns a new integer reflecting the combination of the two 13165 * states. 13166 */ 13167 public static int combineMeasuredStates(int curState, int newState) { 13168 return curState | newState; 13169 } 13170 13171 /** 13172 * Version of {@link #resolveSizeAndState(int, int, int)} 13173 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 13174 */ 13175 public static int resolveSize(int size, int measureSpec) { 13176 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 13177 } 13178 13179 /** 13180 * Utility to reconcile a desired size and state, with constraints imposed 13181 * by a MeasureSpec. Will take the desired size, unless a different size 13182 * is imposed by the constraints. The returned value is a compound integer, 13183 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 13184 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 13185 * size is smaller than the size the view wants to be. 13186 * 13187 * @param size How big the view wants to be 13188 * @param measureSpec Constraints imposed by the parent 13189 * @return Size information bit mask as defined by 13190 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 13191 */ 13192 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 13193 int result = size; 13194 int specMode = MeasureSpec.getMode(measureSpec); 13195 int specSize = MeasureSpec.getSize(measureSpec); 13196 switch (specMode) { 13197 case MeasureSpec.UNSPECIFIED: 13198 result = size; 13199 break; 13200 case MeasureSpec.AT_MOST: 13201 if (specSize < size) { 13202 result = specSize | MEASURED_STATE_TOO_SMALL; 13203 } else { 13204 result = size; 13205 } 13206 break; 13207 case MeasureSpec.EXACTLY: 13208 result = specSize; 13209 break; 13210 } 13211 return result | (childMeasuredState&MEASURED_STATE_MASK); 13212 } 13213 13214 /** 13215 * Utility to return a default size. Uses the supplied size if the 13216 * MeasureSpec imposed no constraints. Will get larger if allowed 13217 * by the MeasureSpec. 13218 * 13219 * @param size Default size for this view 13220 * @param measureSpec Constraints imposed by the parent 13221 * @return The size this view should be. 13222 */ 13223 public static int getDefaultSize(int size, int measureSpec) { 13224 int result = size; 13225 int specMode = MeasureSpec.getMode(measureSpec); 13226 int specSize = MeasureSpec.getSize(measureSpec); 13227 13228 switch (specMode) { 13229 case MeasureSpec.UNSPECIFIED: 13230 result = size; 13231 break; 13232 case MeasureSpec.AT_MOST: 13233 case MeasureSpec.EXACTLY: 13234 result = specSize; 13235 break; 13236 } 13237 return result; 13238 } 13239 13240 /** 13241 * Returns the suggested minimum height that the view should use. This 13242 * returns the maximum of the view's minimum height 13243 * and the background's minimum height 13244 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 13245 * <p> 13246 * When being used in {@link #onMeasure(int, int)}, the caller should still 13247 * ensure the returned height is within the requirements of the parent. 13248 * 13249 * @return The suggested minimum height of the view. 13250 */ 13251 protected int getSuggestedMinimumHeight() { 13252 int suggestedMinHeight = mMinHeight; 13253 13254 if (mBGDrawable != null) { 13255 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 13256 if (suggestedMinHeight < bgMinHeight) { 13257 suggestedMinHeight = bgMinHeight; 13258 } 13259 } 13260 13261 return suggestedMinHeight; 13262 } 13263 13264 /** 13265 * Returns the suggested minimum width that the view should use. This 13266 * returns the maximum of the view's minimum width) 13267 * and the background's minimum width 13268 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 13269 * <p> 13270 * When being used in {@link #onMeasure(int, int)}, the caller should still 13271 * ensure the returned width is within the requirements of the parent. 13272 * 13273 * @return The suggested minimum width of the view. 13274 */ 13275 protected int getSuggestedMinimumWidth() { 13276 int suggestedMinWidth = mMinWidth; 13277 13278 if (mBGDrawable != null) { 13279 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 13280 if (suggestedMinWidth < bgMinWidth) { 13281 suggestedMinWidth = bgMinWidth; 13282 } 13283 } 13284 13285 return suggestedMinWidth; 13286 } 13287 13288 /** 13289 * Sets the minimum height of the view. It is not guaranteed the view will 13290 * be able to achieve this minimum height (for example, if its parent layout 13291 * constrains it with less available height). 13292 * 13293 * @param minHeight The minimum height the view will try to be. 13294 */ 13295 public void setMinimumHeight(int minHeight) { 13296 mMinHeight = minHeight; 13297 } 13298 13299 /** 13300 * Sets the minimum width of the view. It is not guaranteed the view will 13301 * be able to achieve this minimum width (for example, if its parent layout 13302 * constrains it with less available width). 13303 * 13304 * @param minWidth The minimum width the view will try to be. 13305 */ 13306 public void setMinimumWidth(int minWidth) { 13307 mMinWidth = minWidth; 13308 } 13309 13310 /** 13311 * Get the animation currently associated with this view. 13312 * 13313 * @return The animation that is currently playing or 13314 * scheduled to play for this view. 13315 */ 13316 public Animation getAnimation() { 13317 return mCurrentAnimation; 13318 } 13319 13320 /** 13321 * Start the specified animation now. 13322 * 13323 * @param animation the animation to start now 13324 */ 13325 public void startAnimation(Animation animation) { 13326 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 13327 setAnimation(animation); 13328 invalidateParentCaches(); 13329 invalidate(true); 13330 } 13331 13332 /** 13333 * Cancels any animations for this view. 13334 */ 13335 public void clearAnimation() { 13336 if (mCurrentAnimation != null) { 13337 mCurrentAnimation.detach(); 13338 } 13339 mCurrentAnimation = null; 13340 invalidateParentIfNeeded(); 13341 } 13342 13343 /** 13344 * Sets the next animation to play for this view. 13345 * If you want the animation to play immediately, use 13346 * startAnimation. This method provides allows fine-grained 13347 * control over the start time and invalidation, but you 13348 * must make sure that 1) the animation has a start time set, and 13349 * 2) the view will be invalidated when the animation is supposed to 13350 * start. 13351 * 13352 * @param animation The next animation, or null. 13353 */ 13354 public void setAnimation(Animation animation) { 13355 mCurrentAnimation = animation; 13356 if (animation != null) { 13357 animation.reset(); 13358 } 13359 } 13360 13361 /** 13362 * Invoked by a parent ViewGroup to notify the start of the animation 13363 * currently associated with this view. If you override this method, 13364 * always call super.onAnimationStart(); 13365 * 13366 * @see #setAnimation(android.view.animation.Animation) 13367 * @see #getAnimation() 13368 */ 13369 protected void onAnimationStart() { 13370 mPrivateFlags |= ANIMATION_STARTED; 13371 } 13372 13373 /** 13374 * Invoked by a parent ViewGroup to notify the end of the animation 13375 * currently associated with this view. If you override this method, 13376 * always call super.onAnimationEnd(); 13377 * 13378 * @see #setAnimation(android.view.animation.Animation) 13379 * @see #getAnimation() 13380 */ 13381 protected void onAnimationEnd() { 13382 mPrivateFlags &= ~ANIMATION_STARTED; 13383 } 13384 13385 /** 13386 * Invoked if there is a Transform that involves alpha. Subclass that can 13387 * draw themselves with the specified alpha should return true, and then 13388 * respect that alpha when their onDraw() is called. If this returns false 13389 * then the view may be redirected to draw into an offscreen buffer to 13390 * fulfill the request, which will look fine, but may be slower than if the 13391 * subclass handles it internally. The default implementation returns false. 13392 * 13393 * @param alpha The alpha (0..255) to apply to the view's drawing 13394 * @return true if the view can draw with the specified alpha. 13395 */ 13396 protected boolean onSetAlpha(int alpha) { 13397 return false; 13398 } 13399 13400 /** 13401 * This is used by the RootView to perform an optimization when 13402 * the view hierarchy contains one or several SurfaceView. 13403 * SurfaceView is always considered transparent, but its children are not, 13404 * therefore all View objects remove themselves from the global transparent 13405 * region (passed as a parameter to this function). 13406 * 13407 * @param region The transparent region for this ViewAncestor (window). 13408 * 13409 * @return Returns true if the effective visibility of the view at this 13410 * point is opaque, regardless of the transparent region; returns false 13411 * if it is possible for underlying windows to be seen behind the view. 13412 * 13413 * {@hide} 13414 */ 13415 public boolean gatherTransparentRegion(Region region) { 13416 final AttachInfo attachInfo = mAttachInfo; 13417 if (region != null && attachInfo != null) { 13418 final int pflags = mPrivateFlags; 13419 if ((pflags & SKIP_DRAW) == 0) { 13420 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 13421 // remove it from the transparent region. 13422 final int[] location = attachInfo.mTransparentLocation; 13423 getLocationInWindow(location); 13424 region.op(location[0], location[1], location[0] + mRight - mLeft, 13425 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 13426 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 13427 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 13428 // exists, so we remove the background drawable's non-transparent 13429 // parts from this transparent region. 13430 applyDrawableToTransparentRegion(mBGDrawable, region); 13431 } 13432 } 13433 return true; 13434 } 13435 13436 /** 13437 * Play a sound effect for this view. 13438 * 13439 * <p>The framework will play sound effects for some built in actions, such as 13440 * clicking, but you may wish to play these effects in your widget, 13441 * for instance, for internal navigation. 13442 * 13443 * <p>The sound effect will only be played if sound effects are enabled by the user, and 13444 * {@link #isSoundEffectsEnabled()} is true. 13445 * 13446 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 13447 */ 13448 public void playSoundEffect(int soundConstant) { 13449 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 13450 return; 13451 } 13452 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 13453 } 13454 13455 /** 13456 * BZZZTT!!1! 13457 * 13458 * <p>Provide haptic feedback to the user for this view. 13459 * 13460 * <p>The framework will provide haptic feedback for some built in actions, 13461 * such as long presses, but you may wish to provide feedback for your 13462 * own widget. 13463 * 13464 * <p>The feedback will only be performed if 13465 * {@link #isHapticFeedbackEnabled()} is true. 13466 * 13467 * @param feedbackConstant One of the constants defined in 13468 * {@link HapticFeedbackConstants} 13469 */ 13470 public boolean performHapticFeedback(int feedbackConstant) { 13471 return performHapticFeedback(feedbackConstant, 0); 13472 } 13473 13474 /** 13475 * BZZZTT!!1! 13476 * 13477 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 13478 * 13479 * @param feedbackConstant One of the constants defined in 13480 * {@link HapticFeedbackConstants} 13481 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 13482 */ 13483 public boolean performHapticFeedback(int feedbackConstant, int flags) { 13484 if (mAttachInfo == null) { 13485 return false; 13486 } 13487 //noinspection SimplifiableIfStatement 13488 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 13489 && !isHapticFeedbackEnabled()) { 13490 return false; 13491 } 13492 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 13493 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 13494 } 13495 13496 /** 13497 * Request that the visibility of the status bar be changed. 13498 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13499 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13500 */ 13501 public void setSystemUiVisibility(int visibility) { 13502 if (visibility != mSystemUiVisibility) { 13503 mSystemUiVisibility = visibility; 13504 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 13505 mParent.recomputeViewAttributes(this); 13506 } 13507 } 13508 } 13509 13510 /** 13511 * Returns the status bar visibility that this view has requested. 13512 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13513 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13514 */ 13515 public int getSystemUiVisibility() { 13516 return mSystemUiVisibility; 13517 } 13518 13519 /** 13520 * Set a listener to receive callbacks when the visibility of the system bar changes. 13521 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 13522 */ 13523 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 13524 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 13525 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 13526 mParent.recomputeViewAttributes(this); 13527 } 13528 } 13529 13530 /** 13531 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 13532 * the view hierarchy. 13533 */ 13534 public void dispatchSystemUiVisibilityChanged(int visibility) { 13535 ListenerInfo li = mListenerInfo; 13536 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 13537 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 13538 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 13539 } 13540 } 13541 13542 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 13543 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 13544 if (val != mSystemUiVisibility) { 13545 setSystemUiVisibility(val); 13546 } 13547 } 13548 13549 /** 13550 * Creates an image that the system displays during the drag and drop 13551 * operation. This is called a "drag shadow". The default implementation 13552 * for a DragShadowBuilder based on a View returns an image that has exactly the same 13553 * appearance as the given View. The default also positions the center of the drag shadow 13554 * directly under the touch point. If no View is provided (the constructor with no parameters 13555 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 13556 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 13557 * default is an invisible drag shadow. 13558 * <p> 13559 * You are not required to use the View you provide to the constructor as the basis of the 13560 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 13561 * anything you want as the drag shadow. 13562 * </p> 13563 * <p> 13564 * You pass a DragShadowBuilder object to the system when you start the drag. The system 13565 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 13566 * size and position of the drag shadow. It uses this data to construct a 13567 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 13568 * so that your application can draw the shadow image in the Canvas. 13569 * </p> 13570 * 13571 * <div class="special reference"> 13572 * <h3>Developer Guides</h3> 13573 * <p>For a guide to implementing drag and drop features, read the 13574 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 13575 * </div> 13576 */ 13577 public static class DragShadowBuilder { 13578 private final WeakReference<View> mView; 13579 13580 /** 13581 * Constructs a shadow image builder based on a View. By default, the resulting drag 13582 * shadow will have the same appearance and dimensions as the View, with the touch point 13583 * over the center of the View. 13584 * @param view A View. Any View in scope can be used. 13585 */ 13586 public DragShadowBuilder(View view) { 13587 mView = new WeakReference<View>(view); 13588 } 13589 13590 /** 13591 * Construct a shadow builder object with no associated View. This 13592 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 13593 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 13594 * to supply the drag shadow's dimensions and appearance without 13595 * reference to any View object. If they are not overridden, then the result is an 13596 * invisible drag shadow. 13597 */ 13598 public DragShadowBuilder() { 13599 mView = new WeakReference<View>(null); 13600 } 13601 13602 /** 13603 * Returns the View object that had been passed to the 13604 * {@link #View.DragShadowBuilder(View)} 13605 * constructor. If that View parameter was {@code null} or if the 13606 * {@link #View.DragShadowBuilder()} 13607 * constructor was used to instantiate the builder object, this method will return 13608 * null. 13609 * 13610 * @return The View object associate with this builder object. 13611 */ 13612 @SuppressWarnings({"JavadocReference"}) 13613 final public View getView() { 13614 return mView.get(); 13615 } 13616 13617 /** 13618 * Provides the metrics for the shadow image. These include the dimensions of 13619 * the shadow image, and the point within that shadow that should 13620 * be centered under the touch location while dragging. 13621 * <p> 13622 * The default implementation sets the dimensions of the shadow to be the 13623 * same as the dimensions of the View itself and centers the shadow under 13624 * the touch point. 13625 * </p> 13626 * 13627 * @param shadowSize A {@link android.graphics.Point} containing the width and height 13628 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 13629 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 13630 * image. 13631 * 13632 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 13633 * shadow image that should be underneath the touch point during the drag and drop 13634 * operation. Your application must set {@link android.graphics.Point#x} to the 13635 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 13636 */ 13637 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 13638 final View view = mView.get(); 13639 if (view != null) { 13640 shadowSize.set(view.getWidth(), view.getHeight()); 13641 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 13642 } else { 13643 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 13644 } 13645 } 13646 13647 /** 13648 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 13649 * based on the dimensions it received from the 13650 * {@link #onProvideShadowMetrics(Point, Point)} callback. 13651 * 13652 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 13653 */ 13654 public void onDrawShadow(Canvas canvas) { 13655 final View view = mView.get(); 13656 if (view != null) { 13657 view.draw(canvas); 13658 } else { 13659 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 13660 } 13661 } 13662 } 13663 13664 /** 13665 * Starts a drag and drop operation. When your application calls this method, it passes a 13666 * {@link android.view.View.DragShadowBuilder} object to the system. The 13667 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 13668 * to get metrics for the drag shadow, and then calls the object's 13669 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 13670 * <p> 13671 * Once the system has the drag shadow, it begins the drag and drop operation by sending 13672 * drag events to all the View objects in your application that are currently visible. It does 13673 * this either by calling the View object's drag listener (an implementation of 13674 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 13675 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 13676 * Both are passed a {@link android.view.DragEvent} object that has a 13677 * {@link android.view.DragEvent#getAction()} value of 13678 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 13679 * </p> 13680 * <p> 13681 * Your application can invoke startDrag() on any attached View object. The View object does not 13682 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 13683 * be related to the View the user selected for dragging. 13684 * </p> 13685 * @param data A {@link android.content.ClipData} object pointing to the data to be 13686 * transferred by the drag and drop operation. 13687 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 13688 * drag shadow. 13689 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 13690 * drop operation. This Object is put into every DragEvent object sent by the system during the 13691 * current drag. 13692 * <p> 13693 * myLocalState is a lightweight mechanism for the sending information from the dragged View 13694 * to the target Views. For example, it can contain flags that differentiate between a 13695 * a copy operation and a move operation. 13696 * </p> 13697 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 13698 * so the parameter should be set to 0. 13699 * @return {@code true} if the method completes successfully, or 13700 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 13701 * do a drag, and so no drag operation is in progress. 13702 */ 13703 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 13704 Object myLocalState, int flags) { 13705 if (ViewDebug.DEBUG_DRAG) { 13706 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 13707 } 13708 boolean okay = false; 13709 13710 Point shadowSize = new Point(); 13711 Point shadowTouchPoint = new Point(); 13712 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 13713 13714 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 13715 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 13716 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 13717 } 13718 13719 if (ViewDebug.DEBUG_DRAG) { 13720 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 13721 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 13722 } 13723 Surface surface = new Surface(); 13724 try { 13725 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 13726 flags, shadowSize.x, shadowSize.y, surface); 13727 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 13728 + " surface=" + surface); 13729 if (token != null) { 13730 Canvas canvas = surface.lockCanvas(null); 13731 try { 13732 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 13733 shadowBuilder.onDrawShadow(canvas); 13734 } finally { 13735 surface.unlockCanvasAndPost(canvas); 13736 } 13737 13738 final ViewRootImpl root = getViewRootImpl(); 13739 13740 // Cache the local state object for delivery with DragEvents 13741 root.setLocalDragState(myLocalState); 13742 13743 // repurpose 'shadowSize' for the last touch point 13744 root.getLastTouchPoint(shadowSize); 13745 13746 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 13747 shadowSize.x, shadowSize.y, 13748 shadowTouchPoint.x, shadowTouchPoint.y, data); 13749 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 13750 13751 // Off and running! Release our local surface instance; the drag 13752 // shadow surface is now managed by the system process. 13753 surface.release(); 13754 } 13755 } catch (Exception e) { 13756 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 13757 surface.destroy(); 13758 } 13759 13760 return okay; 13761 } 13762 13763 /** 13764 * Handles drag events sent by the system following a call to 13765 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 13766 *<p> 13767 * When the system calls this method, it passes a 13768 * {@link android.view.DragEvent} object. A call to 13769 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 13770 * in DragEvent. The method uses these to determine what is happening in the drag and drop 13771 * operation. 13772 * @param event The {@link android.view.DragEvent} sent by the system. 13773 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 13774 * in DragEvent, indicating the type of drag event represented by this object. 13775 * @return {@code true} if the method was successful, otherwise {@code false}. 13776 * <p> 13777 * The method should return {@code true} in response to an action type of 13778 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 13779 * operation. 13780 * </p> 13781 * <p> 13782 * The method should also return {@code true} in response to an action type of 13783 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 13784 * {@code false} if it didn't. 13785 * </p> 13786 */ 13787 public boolean onDragEvent(DragEvent event) { 13788 return false; 13789 } 13790 13791 /** 13792 * Detects if this View is enabled and has a drag event listener. 13793 * If both are true, then it calls the drag event listener with the 13794 * {@link android.view.DragEvent} it received. If the drag event listener returns 13795 * {@code true}, then dispatchDragEvent() returns {@code true}. 13796 * <p> 13797 * For all other cases, the method calls the 13798 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 13799 * method and returns its result. 13800 * </p> 13801 * <p> 13802 * This ensures that a drag event is always consumed, even if the View does not have a drag 13803 * event listener. However, if the View has a listener and the listener returns true, then 13804 * onDragEvent() is not called. 13805 * </p> 13806 */ 13807 public boolean dispatchDragEvent(DragEvent event) { 13808 //noinspection SimplifiableIfStatement 13809 ListenerInfo li = mListenerInfo; 13810 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 13811 && li.mOnDragListener.onDrag(this, event)) { 13812 return true; 13813 } 13814 return onDragEvent(event); 13815 } 13816 13817 boolean canAcceptDrag() { 13818 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 13819 } 13820 13821 /** 13822 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 13823 * it is ever exposed at all. 13824 * @hide 13825 */ 13826 public void onCloseSystemDialogs(String reason) { 13827 } 13828 13829 /** 13830 * Given a Drawable whose bounds have been set to draw into this view, 13831 * update a Region being computed for 13832 * {@link #gatherTransparentRegion(android.graphics.Region)} so 13833 * that any non-transparent parts of the Drawable are removed from the 13834 * given transparent region. 13835 * 13836 * @param dr The Drawable whose transparency is to be applied to the region. 13837 * @param region A Region holding the current transparency information, 13838 * where any parts of the region that are set are considered to be 13839 * transparent. On return, this region will be modified to have the 13840 * transparency information reduced by the corresponding parts of the 13841 * Drawable that are not transparent. 13842 * {@hide} 13843 */ 13844 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 13845 if (DBG) { 13846 Log.i("View", "Getting transparent region for: " + this); 13847 } 13848 final Region r = dr.getTransparentRegion(); 13849 final Rect db = dr.getBounds(); 13850 final AttachInfo attachInfo = mAttachInfo; 13851 if (r != null && attachInfo != null) { 13852 final int w = getRight()-getLeft(); 13853 final int h = getBottom()-getTop(); 13854 if (db.left > 0) { 13855 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 13856 r.op(0, 0, db.left, h, Region.Op.UNION); 13857 } 13858 if (db.right < w) { 13859 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 13860 r.op(db.right, 0, w, h, Region.Op.UNION); 13861 } 13862 if (db.top > 0) { 13863 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 13864 r.op(0, 0, w, db.top, Region.Op.UNION); 13865 } 13866 if (db.bottom < h) { 13867 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 13868 r.op(0, db.bottom, w, h, Region.Op.UNION); 13869 } 13870 final int[] location = attachInfo.mTransparentLocation; 13871 getLocationInWindow(location); 13872 r.translate(location[0], location[1]); 13873 region.op(r, Region.Op.INTERSECT); 13874 } else { 13875 region.op(db, Region.Op.DIFFERENCE); 13876 } 13877 } 13878 13879 private void checkForLongClick(int delayOffset) { 13880 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 13881 mHasPerformedLongPress = false; 13882 13883 if (mPendingCheckForLongPress == null) { 13884 mPendingCheckForLongPress = new CheckForLongPress(); 13885 } 13886 mPendingCheckForLongPress.rememberWindowAttachCount(); 13887 postDelayed(mPendingCheckForLongPress, 13888 ViewConfiguration.getLongPressTimeout() - delayOffset); 13889 } 13890 } 13891 13892 /** 13893 * Inflate a view from an XML resource. This convenience method wraps the {@link 13894 * LayoutInflater} class, which provides a full range of options for view inflation. 13895 * 13896 * @param context The Context object for your activity or application. 13897 * @param resource The resource ID to inflate 13898 * @param root A view group that will be the parent. Used to properly inflate the 13899 * layout_* parameters. 13900 * @see LayoutInflater 13901 */ 13902 public static View inflate(Context context, int resource, ViewGroup root) { 13903 LayoutInflater factory = LayoutInflater.from(context); 13904 return factory.inflate(resource, root); 13905 } 13906 13907 /** 13908 * Scroll the view with standard behavior for scrolling beyond the normal 13909 * content boundaries. Views that call this method should override 13910 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 13911 * results of an over-scroll operation. 13912 * 13913 * Views can use this method to handle any touch or fling-based scrolling. 13914 * 13915 * @param deltaX Change in X in pixels 13916 * @param deltaY Change in Y in pixels 13917 * @param scrollX Current X scroll value in pixels before applying deltaX 13918 * @param scrollY Current Y scroll value in pixels before applying deltaY 13919 * @param scrollRangeX Maximum content scroll range along the X axis 13920 * @param scrollRangeY Maximum content scroll range along the Y axis 13921 * @param maxOverScrollX Number of pixels to overscroll by in either direction 13922 * along the X axis. 13923 * @param maxOverScrollY Number of pixels to overscroll by in either direction 13924 * along the Y axis. 13925 * @param isTouchEvent true if this scroll operation is the result of a touch event. 13926 * @return true if scrolling was clamped to an over-scroll boundary along either 13927 * axis, false otherwise. 13928 */ 13929 @SuppressWarnings({"UnusedParameters"}) 13930 protected boolean overScrollBy(int deltaX, int deltaY, 13931 int scrollX, int scrollY, 13932 int scrollRangeX, int scrollRangeY, 13933 int maxOverScrollX, int maxOverScrollY, 13934 boolean isTouchEvent) { 13935 final int overScrollMode = mOverScrollMode; 13936 final boolean canScrollHorizontal = 13937 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 13938 final boolean canScrollVertical = 13939 computeVerticalScrollRange() > computeVerticalScrollExtent(); 13940 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 13941 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 13942 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 13943 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 13944 13945 int newScrollX = scrollX + deltaX; 13946 if (!overScrollHorizontal) { 13947 maxOverScrollX = 0; 13948 } 13949 13950 int newScrollY = scrollY + deltaY; 13951 if (!overScrollVertical) { 13952 maxOverScrollY = 0; 13953 } 13954 13955 // Clamp values if at the limits and record 13956 final int left = -maxOverScrollX; 13957 final int right = maxOverScrollX + scrollRangeX; 13958 final int top = -maxOverScrollY; 13959 final int bottom = maxOverScrollY + scrollRangeY; 13960 13961 boolean clampedX = false; 13962 if (newScrollX > right) { 13963 newScrollX = right; 13964 clampedX = true; 13965 } else if (newScrollX < left) { 13966 newScrollX = left; 13967 clampedX = true; 13968 } 13969 13970 boolean clampedY = false; 13971 if (newScrollY > bottom) { 13972 newScrollY = bottom; 13973 clampedY = true; 13974 } else if (newScrollY < top) { 13975 newScrollY = top; 13976 clampedY = true; 13977 } 13978 13979 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 13980 13981 return clampedX || clampedY; 13982 } 13983 13984 /** 13985 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 13986 * respond to the results of an over-scroll operation. 13987 * 13988 * @param scrollX New X scroll value in pixels 13989 * @param scrollY New Y scroll value in pixels 13990 * @param clampedX True if scrollX was clamped to an over-scroll boundary 13991 * @param clampedY True if scrollY was clamped to an over-scroll boundary 13992 */ 13993 protected void onOverScrolled(int scrollX, int scrollY, 13994 boolean clampedX, boolean clampedY) { 13995 // Intentionally empty. 13996 } 13997 13998 /** 13999 * Returns the over-scroll mode for this view. The result will be 14000 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 14001 * (allow over-scrolling only if the view content is larger than the container), 14002 * or {@link #OVER_SCROLL_NEVER}. 14003 * 14004 * @return This view's over-scroll mode. 14005 */ 14006 public int getOverScrollMode() { 14007 return mOverScrollMode; 14008 } 14009 14010 /** 14011 * Set the over-scroll mode for this view. Valid over-scroll modes are 14012 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 14013 * (allow over-scrolling only if the view content is larger than the container), 14014 * or {@link #OVER_SCROLL_NEVER}. 14015 * 14016 * Setting the over-scroll mode of a view will have an effect only if the 14017 * view is capable of scrolling. 14018 * 14019 * @param overScrollMode The new over-scroll mode for this view. 14020 */ 14021 public void setOverScrollMode(int overScrollMode) { 14022 if (overScrollMode != OVER_SCROLL_ALWAYS && 14023 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 14024 overScrollMode != OVER_SCROLL_NEVER) { 14025 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 14026 } 14027 mOverScrollMode = overScrollMode; 14028 } 14029 14030 /** 14031 * Gets a scale factor that determines the distance the view should scroll 14032 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 14033 * @return The vertical scroll scale factor. 14034 * @hide 14035 */ 14036 protected float getVerticalScrollFactor() { 14037 if (mVerticalScrollFactor == 0) { 14038 TypedValue outValue = new TypedValue(); 14039 if (!mContext.getTheme().resolveAttribute( 14040 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 14041 throw new IllegalStateException( 14042 "Expected theme to define listPreferredItemHeight."); 14043 } 14044 mVerticalScrollFactor = outValue.getDimension( 14045 mContext.getResources().getDisplayMetrics()); 14046 } 14047 return mVerticalScrollFactor; 14048 } 14049 14050 /** 14051 * Gets a scale factor that determines the distance the view should scroll 14052 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 14053 * @return The horizontal scroll scale factor. 14054 * @hide 14055 */ 14056 protected float getHorizontalScrollFactor() { 14057 // TODO: Should use something else. 14058 return getVerticalScrollFactor(); 14059 } 14060 14061 /** 14062 * Return the value specifying the text direction or policy that was set with 14063 * {@link #setTextDirection(int)}. 14064 * 14065 * @return the defined text direction. It can be one of: 14066 * 14067 * {@link #TEXT_DIRECTION_INHERIT}, 14068 * {@link #TEXT_DIRECTION_FIRST_STRONG} 14069 * {@link #TEXT_DIRECTION_ANY_RTL}, 14070 * {@link #TEXT_DIRECTION_LTR}, 14071 * {@link #TEXT_DIRECTION_RTL}, 14072 * {@link #TEXT_DIRECTION_LOCALE}, 14073 * 14074 */ 14075 public int getTextDirection() { 14076 return mTextDirection; 14077 } 14078 14079 /** 14080 * Set the text direction. 14081 * 14082 * @param textDirection the direction to set. Should be one of: 14083 * 14084 * {@link #TEXT_DIRECTION_INHERIT}, 14085 * {@link #TEXT_DIRECTION_FIRST_STRONG} 14086 * {@link #TEXT_DIRECTION_ANY_RTL}, 14087 * {@link #TEXT_DIRECTION_LTR}, 14088 * {@link #TEXT_DIRECTION_RTL}, 14089 * {@link #TEXT_DIRECTION_LOCALE}, 14090 * 14091 */ 14092 public void setTextDirection(int textDirection) { 14093 if (textDirection != mTextDirection) { 14094 mTextDirection = textDirection; 14095 resetResolvedTextDirection(); 14096 requestLayout(); 14097 } 14098 } 14099 14100 /** 14101 * Return the resolved text direction. 14102 * 14103 * @return the resolved text direction. Return one of: 14104 * 14105 * {@link #TEXT_DIRECTION_FIRST_STRONG} 14106 * {@link #TEXT_DIRECTION_ANY_RTL}, 14107 * {@link #TEXT_DIRECTION_LTR}, 14108 * {@link #TEXT_DIRECTION_RTL}, 14109 * {@link #TEXT_DIRECTION_LOCALE}, 14110 * 14111 */ 14112 public int getResolvedTextDirection() { 14113 if (mResolvedTextDirection == TEXT_DIRECTION_INHERIT) { 14114 resolveTextDirection(); 14115 } 14116 return mResolvedTextDirection; 14117 } 14118 14119 /** 14120 * Resolve the text direction. 14121 * 14122 */ 14123 protected void resolveTextDirection() { 14124 if (mTextDirection != TEXT_DIRECTION_INHERIT) { 14125 mResolvedTextDirection = mTextDirection; 14126 return; 14127 } 14128 if (mParent != null && mParent instanceof ViewGroup) { 14129 mResolvedTextDirection = ((ViewGroup) mParent).getResolvedTextDirection(); 14130 return; 14131 } 14132 mResolvedTextDirection = TEXT_DIRECTION_FIRST_STRONG; 14133 } 14134 14135 /** 14136 * Reset resolved text direction. Will be resolved during a call to getResolvedTextDirection(). 14137 * 14138 */ 14139 protected void resetResolvedTextDirection() { 14140 mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 14141 } 14142 14143 // 14144 // Properties 14145 // 14146 /** 14147 * A Property wrapper around the <code>alpha</code> functionality handled by the 14148 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 14149 */ 14150 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 14151 @Override 14152 public void setValue(View object, float value) { 14153 object.setAlpha(value); 14154 } 14155 14156 @Override 14157 public Float get(View object) { 14158 return object.getAlpha(); 14159 } 14160 }; 14161 14162 /** 14163 * A Property wrapper around the <code>translationX</code> functionality handled by the 14164 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 14165 */ 14166 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 14167 @Override 14168 public void setValue(View object, float value) { 14169 object.setTranslationX(value); 14170 } 14171 14172 @Override 14173 public Float get(View object) { 14174 return object.getTranslationX(); 14175 } 14176 }; 14177 14178 /** 14179 * A Property wrapper around the <code>translationY</code> functionality handled by the 14180 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 14181 */ 14182 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 14183 @Override 14184 public void setValue(View object, float value) { 14185 object.setTranslationY(value); 14186 } 14187 14188 @Override 14189 public Float get(View object) { 14190 return object.getTranslationY(); 14191 } 14192 }; 14193 14194 /** 14195 * A Property wrapper around the <code>x</code> functionality handled by the 14196 * {@link View#setX(float)} and {@link View#getX()} methods. 14197 */ 14198 public static final Property<View, Float> X = new FloatProperty<View>("x") { 14199 @Override 14200 public void setValue(View object, float value) { 14201 object.setX(value); 14202 } 14203 14204 @Override 14205 public Float get(View object) { 14206 return object.getX(); 14207 } 14208 }; 14209 14210 /** 14211 * A Property wrapper around the <code>y</code> functionality handled by the 14212 * {@link View#setY(float)} and {@link View#getY()} methods. 14213 */ 14214 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 14215 @Override 14216 public void setValue(View object, float value) { 14217 object.setY(value); 14218 } 14219 14220 @Override 14221 public Float get(View object) { 14222 return object.getY(); 14223 } 14224 }; 14225 14226 /** 14227 * A Property wrapper around the <code>rotation</code> functionality handled by the 14228 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 14229 */ 14230 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 14231 @Override 14232 public void setValue(View object, float value) { 14233 object.setRotation(value); 14234 } 14235 14236 @Override 14237 public Float get(View object) { 14238 return object.getRotation(); 14239 } 14240 }; 14241 14242 /** 14243 * A Property wrapper around the <code>rotationX</code> functionality handled by the 14244 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 14245 */ 14246 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 14247 @Override 14248 public void setValue(View object, float value) { 14249 object.setRotationX(value); 14250 } 14251 14252 @Override 14253 public Float get(View object) { 14254 return object.getRotationX(); 14255 } 14256 }; 14257 14258 /** 14259 * A Property wrapper around the <code>rotationY</code> functionality handled by the 14260 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 14261 */ 14262 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 14263 @Override 14264 public void setValue(View object, float value) { 14265 object.setRotationY(value); 14266 } 14267 14268 @Override 14269 public Float get(View object) { 14270 return object.getRotationY(); 14271 } 14272 }; 14273 14274 /** 14275 * A Property wrapper around the <code>scaleX</code> functionality handled by the 14276 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 14277 */ 14278 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 14279 @Override 14280 public void setValue(View object, float value) { 14281 object.setScaleX(value); 14282 } 14283 14284 @Override 14285 public Float get(View object) { 14286 return object.getScaleX(); 14287 } 14288 }; 14289 14290 /** 14291 * A Property wrapper around the <code>scaleY</code> functionality handled by the 14292 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 14293 */ 14294 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 14295 @Override 14296 public void setValue(View object, float value) { 14297 object.setScaleY(value); 14298 } 14299 14300 @Override 14301 public Float get(View object) { 14302 return object.getScaleY(); 14303 } 14304 }; 14305 14306 /** 14307 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 14308 * Each MeasureSpec represents a requirement for either the width or the height. 14309 * A MeasureSpec is comprised of a size and a mode. There are three possible 14310 * modes: 14311 * <dl> 14312 * <dt>UNSPECIFIED</dt> 14313 * <dd> 14314 * The parent has not imposed any constraint on the child. It can be whatever size 14315 * it wants. 14316 * </dd> 14317 * 14318 * <dt>EXACTLY</dt> 14319 * <dd> 14320 * The parent has determined an exact size for the child. The child is going to be 14321 * given those bounds regardless of how big it wants to be. 14322 * </dd> 14323 * 14324 * <dt>AT_MOST</dt> 14325 * <dd> 14326 * The child can be as large as it wants up to the specified size. 14327 * </dd> 14328 * </dl> 14329 * 14330 * MeasureSpecs are implemented as ints to reduce object allocation. This class 14331 * is provided to pack and unpack the <size, mode> tuple into the int. 14332 */ 14333 public static class MeasureSpec { 14334 private static final int MODE_SHIFT = 30; 14335 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 14336 14337 /** 14338 * Measure specification mode: The parent has not imposed any constraint 14339 * on the child. It can be whatever size it wants. 14340 */ 14341 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 14342 14343 /** 14344 * Measure specification mode: The parent has determined an exact size 14345 * for the child. The child is going to be given those bounds regardless 14346 * of how big it wants to be. 14347 */ 14348 public static final int EXACTLY = 1 << MODE_SHIFT; 14349 14350 /** 14351 * Measure specification mode: The child can be as large as it wants up 14352 * to the specified size. 14353 */ 14354 public static final int AT_MOST = 2 << MODE_SHIFT; 14355 14356 /** 14357 * Creates a measure specification based on the supplied size and mode. 14358 * 14359 * The mode must always be one of the following: 14360 * <ul> 14361 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 14362 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 14363 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 14364 * </ul> 14365 * 14366 * @param size the size of the measure specification 14367 * @param mode the mode of the measure specification 14368 * @return the measure specification based on size and mode 14369 */ 14370 public static int makeMeasureSpec(int size, int mode) { 14371 return size + mode; 14372 } 14373 14374 /** 14375 * Extracts the mode from the supplied measure specification. 14376 * 14377 * @param measureSpec the measure specification to extract the mode from 14378 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 14379 * {@link android.view.View.MeasureSpec#AT_MOST} or 14380 * {@link android.view.View.MeasureSpec#EXACTLY} 14381 */ 14382 public static int getMode(int measureSpec) { 14383 return (measureSpec & MODE_MASK); 14384 } 14385 14386 /** 14387 * Extracts the size from the supplied measure specification. 14388 * 14389 * @param measureSpec the measure specification to extract the size from 14390 * @return the size in pixels defined in the supplied measure specification 14391 */ 14392 public static int getSize(int measureSpec) { 14393 return (measureSpec & ~MODE_MASK); 14394 } 14395 14396 /** 14397 * Returns a String representation of the specified measure 14398 * specification. 14399 * 14400 * @param measureSpec the measure specification to convert to a String 14401 * @return a String with the following format: "MeasureSpec: MODE SIZE" 14402 */ 14403 public static String toString(int measureSpec) { 14404 int mode = getMode(measureSpec); 14405 int size = getSize(measureSpec); 14406 14407 StringBuilder sb = new StringBuilder("MeasureSpec: "); 14408 14409 if (mode == UNSPECIFIED) 14410 sb.append("UNSPECIFIED "); 14411 else if (mode == EXACTLY) 14412 sb.append("EXACTLY "); 14413 else if (mode == AT_MOST) 14414 sb.append("AT_MOST "); 14415 else 14416 sb.append(mode).append(" "); 14417 14418 sb.append(size); 14419 return sb.toString(); 14420 } 14421 } 14422 14423 class CheckForLongPress implements Runnable { 14424 14425 private int mOriginalWindowAttachCount; 14426 14427 public void run() { 14428 if (isPressed() && (mParent != null) 14429 && mOriginalWindowAttachCount == mWindowAttachCount) { 14430 if (performLongClick()) { 14431 mHasPerformedLongPress = true; 14432 } 14433 } 14434 } 14435 14436 public void rememberWindowAttachCount() { 14437 mOriginalWindowAttachCount = mWindowAttachCount; 14438 } 14439 } 14440 14441 private final class CheckForTap implements Runnable { 14442 public void run() { 14443 mPrivateFlags &= ~PREPRESSED; 14444 mPrivateFlags |= PRESSED; 14445 refreshDrawableState(); 14446 checkForLongClick(ViewConfiguration.getTapTimeout()); 14447 } 14448 } 14449 14450 private final class PerformClick implements Runnable { 14451 public void run() { 14452 performClick(); 14453 } 14454 } 14455 14456 /** @hide */ 14457 public void hackTurnOffWindowResizeAnim(boolean off) { 14458 mAttachInfo.mTurnOffWindowResizeAnim = off; 14459 } 14460 14461 /** 14462 * This method returns a ViewPropertyAnimator object, which can be used to animate 14463 * specific properties on this View. 14464 * 14465 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 14466 */ 14467 public ViewPropertyAnimator animate() { 14468 if (mAnimator == null) { 14469 mAnimator = new ViewPropertyAnimator(this); 14470 } 14471 return mAnimator; 14472 } 14473 14474 /** 14475 * Interface definition for a callback to be invoked when a key event is 14476 * dispatched to this view. The callback will be invoked before the key 14477 * event is given to the view. 14478 */ 14479 public interface OnKeyListener { 14480 /** 14481 * Called when a key is dispatched to a view. This allows listeners to 14482 * get a chance to respond before the target view. 14483 * 14484 * @param v The view the key has been dispatched to. 14485 * @param keyCode The code for the physical key that was pressed 14486 * @param event The KeyEvent object containing full information about 14487 * the event. 14488 * @return True if the listener has consumed the event, false otherwise. 14489 */ 14490 boolean onKey(View v, int keyCode, KeyEvent event); 14491 } 14492 14493 /** 14494 * Interface definition for a callback to be invoked when a touch event is 14495 * dispatched to this view. The callback will be invoked before the touch 14496 * event is given to the view. 14497 */ 14498 public interface OnTouchListener { 14499 /** 14500 * Called when a touch event is dispatched to a view. This allows listeners to 14501 * get a chance to respond before the target view. 14502 * 14503 * @param v The view the touch event has been dispatched to. 14504 * @param event The MotionEvent object containing full information about 14505 * the event. 14506 * @return True if the listener has consumed the event, false otherwise. 14507 */ 14508 boolean onTouch(View v, MotionEvent event); 14509 } 14510 14511 /** 14512 * Interface definition for a callback to be invoked when a hover event is 14513 * dispatched to this view. The callback will be invoked before the hover 14514 * event is given to the view. 14515 */ 14516 public interface OnHoverListener { 14517 /** 14518 * Called when a hover event is dispatched to a view. This allows listeners to 14519 * get a chance to respond before the target view. 14520 * 14521 * @param v The view the hover event has been dispatched to. 14522 * @param event The MotionEvent object containing full information about 14523 * the event. 14524 * @return True if the listener has consumed the event, false otherwise. 14525 */ 14526 boolean onHover(View v, MotionEvent event); 14527 } 14528 14529 /** 14530 * Interface definition for a callback to be invoked when a generic motion event is 14531 * dispatched to this view. The callback will be invoked before the generic motion 14532 * event is given to the view. 14533 */ 14534 public interface OnGenericMotionListener { 14535 /** 14536 * Called when a generic motion event is dispatched to a view. This allows listeners to 14537 * get a chance to respond before the target view. 14538 * 14539 * @param v The view the generic motion event has been dispatched to. 14540 * @param event The MotionEvent object containing full information about 14541 * the event. 14542 * @return True if the listener has consumed the event, false otherwise. 14543 */ 14544 boolean onGenericMotion(View v, MotionEvent event); 14545 } 14546 14547 /** 14548 * Interface definition for a callback to be invoked when a view has been clicked and held. 14549 */ 14550 public interface OnLongClickListener { 14551 /** 14552 * Called when a view has been clicked and held. 14553 * 14554 * @param v The view that was clicked and held. 14555 * 14556 * @return true if the callback consumed the long click, false otherwise. 14557 */ 14558 boolean onLongClick(View v); 14559 } 14560 14561 /** 14562 * Interface definition for a callback to be invoked when a drag is being dispatched 14563 * to this view. The callback will be invoked before the hosting view's own 14564 * onDrag(event) method. If the listener wants to fall back to the hosting view's 14565 * onDrag(event) behavior, it should return 'false' from this callback. 14566 * 14567 * <div class="special reference"> 14568 * <h3>Developer Guides</h3> 14569 * <p>For a guide to implementing drag and drop features, read the 14570 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 14571 * </div> 14572 */ 14573 public interface OnDragListener { 14574 /** 14575 * Called when a drag event is dispatched to a view. This allows listeners 14576 * to get a chance to override base View behavior. 14577 * 14578 * @param v The View that received the drag event. 14579 * @param event The {@link android.view.DragEvent} object for the drag event. 14580 * @return {@code true} if the drag event was handled successfully, or {@code false} 14581 * if the drag event was not handled. Note that {@code false} will trigger the View 14582 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 14583 */ 14584 boolean onDrag(View v, DragEvent event); 14585 } 14586 14587 /** 14588 * Interface definition for a callback to be invoked when the focus state of 14589 * a view changed. 14590 */ 14591 public interface OnFocusChangeListener { 14592 /** 14593 * Called when the focus state of a view has changed. 14594 * 14595 * @param v The view whose state has changed. 14596 * @param hasFocus The new focus state of v. 14597 */ 14598 void onFocusChange(View v, boolean hasFocus); 14599 } 14600 14601 /** 14602 * Interface definition for a callback to be invoked when a view is clicked. 14603 */ 14604 public interface OnClickListener { 14605 /** 14606 * Called when a view has been clicked. 14607 * 14608 * @param v The view that was clicked. 14609 */ 14610 void onClick(View v); 14611 } 14612 14613 /** 14614 * Interface definition for a callback to be invoked when the context menu 14615 * for this view is being built. 14616 */ 14617 public interface OnCreateContextMenuListener { 14618 /** 14619 * Called when the context menu for this view is being built. It is not 14620 * safe to hold onto the menu after this method returns. 14621 * 14622 * @param menu The context menu that is being built 14623 * @param v The view for which the context menu is being built 14624 * @param menuInfo Extra information about the item for which the 14625 * context menu should be shown. This information will vary 14626 * depending on the class of v. 14627 */ 14628 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 14629 } 14630 14631 /** 14632 * Interface definition for a callback to be invoked when the status bar changes 14633 * visibility. This reports <strong>global</strong> changes to the system UI 14634 * state, not just what the application is requesting. 14635 * 14636 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 14637 */ 14638 public interface OnSystemUiVisibilityChangeListener { 14639 /** 14640 * Called when the status bar changes visibility because of a call to 14641 * {@link View#setSystemUiVisibility(int)}. 14642 * 14643 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 14644 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. This tells you the 14645 * <strong>global</strong> state of the UI visibility flags, not what your 14646 * app is currently applying. 14647 */ 14648 public void onSystemUiVisibilityChange(int visibility); 14649 } 14650 14651 /** 14652 * Interface definition for a callback to be invoked when this view is attached 14653 * or detached from its window. 14654 */ 14655 public interface OnAttachStateChangeListener { 14656 /** 14657 * Called when the view is attached to a window. 14658 * @param v The view that was attached 14659 */ 14660 public void onViewAttachedToWindow(View v); 14661 /** 14662 * Called when the view is detached from a window. 14663 * @param v The view that was detached 14664 */ 14665 public void onViewDetachedFromWindow(View v); 14666 } 14667 14668 private final class UnsetPressedState implements Runnable { 14669 public void run() { 14670 setPressed(false); 14671 } 14672 } 14673 14674 /** 14675 * Base class for derived classes that want to save and restore their own 14676 * state in {@link android.view.View#onSaveInstanceState()}. 14677 */ 14678 public static class BaseSavedState extends AbsSavedState { 14679 /** 14680 * Constructor used when reading from a parcel. Reads the state of the superclass. 14681 * 14682 * @param source 14683 */ 14684 public BaseSavedState(Parcel source) { 14685 super(source); 14686 } 14687 14688 /** 14689 * Constructor called by derived classes when creating their SavedState objects 14690 * 14691 * @param superState The state of the superclass of this view 14692 */ 14693 public BaseSavedState(Parcelable superState) { 14694 super(superState); 14695 } 14696 14697 public static final Parcelable.Creator<BaseSavedState> CREATOR = 14698 new Parcelable.Creator<BaseSavedState>() { 14699 public BaseSavedState createFromParcel(Parcel in) { 14700 return new BaseSavedState(in); 14701 } 14702 14703 public BaseSavedState[] newArray(int size) { 14704 return new BaseSavedState[size]; 14705 } 14706 }; 14707 } 14708 14709 /** 14710 * A set of information given to a view when it is attached to its parent 14711 * window. 14712 */ 14713 static class AttachInfo { 14714 interface Callbacks { 14715 void playSoundEffect(int effectId); 14716 boolean performHapticFeedback(int effectId, boolean always); 14717 } 14718 14719 /** 14720 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 14721 * to a Handler. This class contains the target (View) to invalidate and 14722 * the coordinates of the dirty rectangle. 14723 * 14724 * For performance purposes, this class also implements a pool of up to 14725 * POOL_LIMIT objects that get reused. This reduces memory allocations 14726 * whenever possible. 14727 */ 14728 static class InvalidateInfo implements Poolable<InvalidateInfo> { 14729 private static final int POOL_LIMIT = 10; 14730 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 14731 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 14732 public InvalidateInfo newInstance() { 14733 return new InvalidateInfo(); 14734 } 14735 14736 public void onAcquired(InvalidateInfo element) { 14737 } 14738 14739 public void onReleased(InvalidateInfo element) { 14740 element.target = null; 14741 } 14742 }, POOL_LIMIT) 14743 ); 14744 14745 private InvalidateInfo mNext; 14746 private boolean mIsPooled; 14747 14748 View target; 14749 14750 int left; 14751 int top; 14752 int right; 14753 int bottom; 14754 14755 public void setNextPoolable(InvalidateInfo element) { 14756 mNext = element; 14757 } 14758 14759 public InvalidateInfo getNextPoolable() { 14760 return mNext; 14761 } 14762 14763 static InvalidateInfo acquire() { 14764 return sPool.acquire(); 14765 } 14766 14767 void release() { 14768 sPool.release(this); 14769 } 14770 14771 public boolean isPooled() { 14772 return mIsPooled; 14773 } 14774 14775 public void setPooled(boolean isPooled) { 14776 mIsPooled = isPooled; 14777 } 14778 } 14779 14780 final IWindowSession mSession; 14781 14782 final IWindow mWindow; 14783 14784 final IBinder mWindowToken; 14785 14786 final Callbacks mRootCallbacks; 14787 14788 HardwareCanvas mHardwareCanvas; 14789 14790 /** 14791 * The top view of the hierarchy. 14792 */ 14793 View mRootView; 14794 14795 IBinder mPanelParentWindowToken; 14796 Surface mSurface; 14797 14798 boolean mHardwareAccelerated; 14799 boolean mHardwareAccelerationRequested; 14800 HardwareRenderer mHardwareRenderer; 14801 14802 /** 14803 * Scale factor used by the compatibility mode 14804 */ 14805 float mApplicationScale; 14806 14807 /** 14808 * Indicates whether the application is in compatibility mode 14809 */ 14810 boolean mScalingRequired; 14811 14812 /** 14813 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 14814 */ 14815 boolean mTurnOffWindowResizeAnim; 14816 14817 /** 14818 * Left position of this view's window 14819 */ 14820 int mWindowLeft; 14821 14822 /** 14823 * Top position of this view's window 14824 */ 14825 int mWindowTop; 14826 14827 /** 14828 * Indicates whether views need to use 32-bit drawing caches 14829 */ 14830 boolean mUse32BitDrawingCache; 14831 14832 /** 14833 * For windows that are full-screen but using insets to layout inside 14834 * of the screen decorations, these are the current insets for the 14835 * content of the window. 14836 */ 14837 final Rect mContentInsets = new Rect(); 14838 14839 /** 14840 * For windows that are full-screen but using insets to layout inside 14841 * of the screen decorations, these are the current insets for the 14842 * actual visible parts of the window. 14843 */ 14844 final Rect mVisibleInsets = new Rect(); 14845 14846 /** 14847 * The internal insets given by this window. This value is 14848 * supplied by the client (through 14849 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 14850 * be given to the window manager when changed to be used in laying 14851 * out windows behind it. 14852 */ 14853 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 14854 = new ViewTreeObserver.InternalInsetsInfo(); 14855 14856 /** 14857 * All views in the window's hierarchy that serve as scroll containers, 14858 * used to determine if the window can be resized or must be panned 14859 * to adjust for a soft input area. 14860 */ 14861 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 14862 14863 final KeyEvent.DispatcherState mKeyDispatchState 14864 = new KeyEvent.DispatcherState(); 14865 14866 /** 14867 * Indicates whether the view's window currently has the focus. 14868 */ 14869 boolean mHasWindowFocus; 14870 14871 /** 14872 * The current visibility of the window. 14873 */ 14874 int mWindowVisibility; 14875 14876 /** 14877 * Indicates the time at which drawing started to occur. 14878 */ 14879 long mDrawingTime; 14880 14881 /** 14882 * Indicates whether or not ignoring the DIRTY_MASK flags. 14883 */ 14884 boolean mIgnoreDirtyState; 14885 14886 /** 14887 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 14888 * to avoid clearing that flag prematurely. 14889 */ 14890 boolean mSetIgnoreDirtyState = false; 14891 14892 /** 14893 * Indicates whether the view's window is currently in touch mode. 14894 */ 14895 boolean mInTouchMode; 14896 14897 /** 14898 * Indicates that ViewAncestor should trigger a global layout change 14899 * the next time it performs a traversal 14900 */ 14901 boolean mRecomputeGlobalAttributes; 14902 14903 /** 14904 * Always report new attributes at next traversal. 14905 */ 14906 boolean mForceReportNewAttributes; 14907 14908 /** 14909 * Set during a traveral if any views want to keep the screen on. 14910 */ 14911 boolean mKeepScreenOn; 14912 14913 /** 14914 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 14915 */ 14916 int mSystemUiVisibility; 14917 14918 /** 14919 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 14920 * attached. 14921 */ 14922 boolean mHasSystemUiListeners; 14923 14924 /** 14925 * Set if the visibility of any views has changed. 14926 */ 14927 boolean mViewVisibilityChanged; 14928 14929 /** 14930 * Set to true if a view has been scrolled. 14931 */ 14932 boolean mViewScrollChanged; 14933 14934 /** 14935 * Global to the view hierarchy used as a temporary for dealing with 14936 * x/y points in the transparent region computations. 14937 */ 14938 final int[] mTransparentLocation = new int[2]; 14939 14940 /** 14941 * Global to the view hierarchy used as a temporary for dealing with 14942 * x/y points in the ViewGroup.invalidateChild implementation. 14943 */ 14944 final int[] mInvalidateChildLocation = new int[2]; 14945 14946 14947 /** 14948 * Global to the view hierarchy used as a temporary for dealing with 14949 * x/y location when view is transformed. 14950 */ 14951 final float[] mTmpTransformLocation = new float[2]; 14952 14953 /** 14954 * The view tree observer used to dispatch global events like 14955 * layout, pre-draw, touch mode change, etc. 14956 */ 14957 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 14958 14959 /** 14960 * A Canvas used by the view hierarchy to perform bitmap caching. 14961 */ 14962 Canvas mCanvas; 14963 14964 /** 14965 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 14966 * handler can be used to pump events in the UI events queue. 14967 */ 14968 final Handler mHandler; 14969 14970 /** 14971 * Identifier for messages requesting the view to be invalidated. 14972 * Such messages should be sent to {@link #mHandler}. 14973 */ 14974 static final int INVALIDATE_MSG = 0x1; 14975 14976 /** 14977 * Identifier for messages requesting the view to invalidate a region. 14978 * Such messages should be sent to {@link #mHandler}. 14979 */ 14980 static final int INVALIDATE_RECT_MSG = 0x2; 14981 14982 /** 14983 * Temporary for use in computing invalidate rectangles while 14984 * calling up the hierarchy. 14985 */ 14986 final Rect mTmpInvalRect = new Rect(); 14987 14988 /** 14989 * Temporary for use in computing hit areas with transformed views 14990 */ 14991 final RectF mTmpTransformRect = new RectF(); 14992 14993 /** 14994 * Temporary list for use in collecting focusable descendents of a view. 14995 */ 14996 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 14997 14998 /** 14999 * The id of the window for accessibility purposes. 15000 */ 15001 int mAccessibilityWindowId = View.NO_ID; 15002 15003 /** 15004 * Creates a new set of attachment information with the specified 15005 * events handler and thread. 15006 * 15007 * @param handler the events handler the view must use 15008 */ 15009 AttachInfo(IWindowSession session, IWindow window, 15010 Handler handler, Callbacks effectPlayer) { 15011 mSession = session; 15012 mWindow = window; 15013 mWindowToken = window.asBinder(); 15014 mHandler = handler; 15015 mRootCallbacks = effectPlayer; 15016 } 15017 } 15018 15019 /** 15020 * <p>ScrollabilityCache holds various fields used by a View when scrolling 15021 * is supported. This avoids keeping too many unused fields in most 15022 * instances of View.</p> 15023 */ 15024 private static class ScrollabilityCache implements Runnable { 15025 15026 /** 15027 * Scrollbars are not visible 15028 */ 15029 public static final int OFF = 0; 15030 15031 /** 15032 * Scrollbars are visible 15033 */ 15034 public static final int ON = 1; 15035 15036 /** 15037 * Scrollbars are fading away 15038 */ 15039 public static final int FADING = 2; 15040 15041 public boolean fadeScrollBars; 15042 15043 public int fadingEdgeLength; 15044 public int scrollBarDefaultDelayBeforeFade; 15045 public int scrollBarFadeDuration; 15046 15047 public int scrollBarSize; 15048 public ScrollBarDrawable scrollBar; 15049 public float[] interpolatorValues; 15050 public View host; 15051 15052 public final Paint paint; 15053 public final Matrix matrix; 15054 public Shader shader; 15055 15056 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 15057 15058 private static final float[] OPAQUE = { 255 }; 15059 private static final float[] TRANSPARENT = { 0.0f }; 15060 15061 /** 15062 * When fading should start. This time moves into the future every time 15063 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 15064 */ 15065 public long fadeStartTime; 15066 15067 15068 /** 15069 * The current state of the scrollbars: ON, OFF, or FADING 15070 */ 15071 public int state = OFF; 15072 15073 private int mLastColor; 15074 15075 public ScrollabilityCache(ViewConfiguration configuration, View host) { 15076 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 15077 scrollBarSize = configuration.getScaledScrollBarSize(); 15078 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 15079 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 15080 15081 paint = new Paint(); 15082 matrix = new Matrix(); 15083 // use use a height of 1, and then wack the matrix each time we 15084 // actually use it. 15085 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 15086 15087 paint.setShader(shader); 15088 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 15089 this.host = host; 15090 } 15091 15092 public void setFadeColor(int color) { 15093 if (color != 0 && color != mLastColor) { 15094 mLastColor = color; 15095 color |= 0xFF000000; 15096 15097 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 15098 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 15099 15100 paint.setShader(shader); 15101 // Restore the default transfer mode (src_over) 15102 paint.setXfermode(null); 15103 } 15104 } 15105 15106 public void run() { 15107 long now = AnimationUtils.currentAnimationTimeMillis(); 15108 if (now >= fadeStartTime) { 15109 15110 // the animation fades the scrollbars out by changing 15111 // the opacity (alpha) from fully opaque to fully 15112 // transparent 15113 int nextFrame = (int) now; 15114 int framesCount = 0; 15115 15116 Interpolator interpolator = scrollBarInterpolator; 15117 15118 // Start opaque 15119 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 15120 15121 // End transparent 15122 nextFrame += scrollBarFadeDuration; 15123 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 15124 15125 state = FADING; 15126 15127 // Kick off the fade animation 15128 host.invalidate(true); 15129 } 15130 } 15131 } 15132 15133 /** 15134 * Resuable callback for sending 15135 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 15136 */ 15137 private class SendViewScrolledAccessibilityEvent implements Runnable { 15138 public volatile boolean mIsPending; 15139 15140 public void run() { 15141 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 15142 mIsPending = false; 15143 } 15144 } 15145 15146 /** 15147 * <p> 15148 * This class represents a delegate that can be registered in a {@link View} 15149 * to enhance accessibility support via composition rather via inheritance. 15150 * It is specifically targeted to widget developers that extend basic View 15151 * classes i.e. classes in package android.view, that would like their 15152 * applications to be backwards compatible. 15153 * </p> 15154 * <p> 15155 * A scenario in which a developer would like to use an accessibility delegate 15156 * is overriding a method introduced in a later API version then the minimal API 15157 * version supported by the application. For example, the method 15158 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 15159 * in API version 4 when the accessibility APIs were first introduced. If a 15160 * developer would like his application to run on API version 4 devices (assuming 15161 * all other APIs used by the application are version 4 or lower) and take advantage 15162 * of this method, instead of overriding the method which would break the application's 15163 * backwards compatibility, he can override the corresponding method in this 15164 * delegate and register the delegate in the target View if the API version of 15165 * the system is high enough i.e. the API version is same or higher to the API 15166 * version that introduced 15167 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 15168 * </p> 15169 * <p> 15170 * Here is an example implementation: 15171 * </p> 15172 * <code><pre><p> 15173 * if (Build.VERSION.SDK_INT >= 14) { 15174 * // If the API version is equal of higher than the version in 15175 * // which onInitializeAccessibilityNodeInfo was introduced we 15176 * // register a delegate with a customized implementation. 15177 * View view = findViewById(R.id.view_id); 15178 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 15179 * public void onInitializeAccessibilityNodeInfo(View host, 15180 * AccessibilityNodeInfo info) { 15181 * // Let the default implementation populate the info. 15182 * super.onInitializeAccessibilityNodeInfo(host, info); 15183 * // Set some other information. 15184 * info.setEnabled(host.isEnabled()); 15185 * } 15186 * }); 15187 * } 15188 * </code></pre></p> 15189 * <p> 15190 * This delegate contains methods that correspond to the accessibility methods 15191 * in View. If a delegate has been specified the implementation in View hands 15192 * off handling to the corresponding method in this delegate. The default 15193 * implementation the delegate methods behaves exactly as the corresponding 15194 * method in View for the case of no accessibility delegate been set. Hence, 15195 * to customize the behavior of a View method, clients can override only the 15196 * corresponding delegate method without altering the behavior of the rest 15197 * accessibility related methods of the host view. 15198 * </p> 15199 */ 15200 public static class AccessibilityDelegate { 15201 15202 /** 15203 * Sends an accessibility event of the given type. If accessibility is not 15204 * enabled this method has no effect. 15205 * <p> 15206 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 15207 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 15208 * been set. 15209 * </p> 15210 * 15211 * @param host The View hosting the delegate. 15212 * @param eventType The type of the event to send. 15213 * 15214 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 15215 */ 15216 public void sendAccessibilityEvent(View host, int eventType) { 15217 host.sendAccessibilityEventInternal(eventType); 15218 } 15219 15220 /** 15221 * Sends an accessibility event. This method behaves exactly as 15222 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 15223 * empty {@link AccessibilityEvent} and does not perform a check whether 15224 * accessibility is enabled. 15225 * <p> 15226 * The default implementation behaves as 15227 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 15228 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 15229 * the case of no accessibility delegate been set. 15230 * </p> 15231 * 15232 * @param host The View hosting the delegate. 15233 * @param event The event to send. 15234 * 15235 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 15236 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 15237 */ 15238 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 15239 host.sendAccessibilityEventUncheckedInternal(event); 15240 } 15241 15242 /** 15243 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 15244 * to its children for adding their text content to the event. 15245 * <p> 15246 * The default implementation behaves as 15247 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 15248 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 15249 * the case of no accessibility delegate been set. 15250 * </p> 15251 * 15252 * @param host The View hosting the delegate. 15253 * @param event The event. 15254 * @return True if the event population was completed. 15255 * 15256 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 15257 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 15258 */ 15259 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 15260 return host.dispatchPopulateAccessibilityEventInternal(event); 15261 } 15262 15263 /** 15264 * Gives a chance to the host View to populate the accessibility event with its 15265 * text content. 15266 * <p> 15267 * The default implementation behaves as 15268 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 15269 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 15270 * the case of no accessibility delegate been set. 15271 * </p> 15272 * 15273 * @param host The View hosting the delegate. 15274 * @param event The accessibility event which to populate. 15275 * 15276 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 15277 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 15278 */ 15279 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 15280 host.onPopulateAccessibilityEventInternal(event); 15281 } 15282 15283 /** 15284 * Initializes an {@link AccessibilityEvent} with information about the 15285 * the host View which is the event source. 15286 * <p> 15287 * The default implementation behaves as 15288 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 15289 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 15290 * the case of no accessibility delegate been set. 15291 * </p> 15292 * 15293 * @param host The View hosting the delegate. 15294 * @param event The event to initialize. 15295 * 15296 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 15297 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 15298 */ 15299 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 15300 host.onInitializeAccessibilityEventInternal(event); 15301 } 15302 15303 /** 15304 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 15305 * <p> 15306 * The default implementation behaves as 15307 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 15308 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 15309 * the case of no accessibility delegate been set. 15310 * </p> 15311 * 15312 * @param host The View hosting the delegate. 15313 * @param info The instance to initialize. 15314 * 15315 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 15316 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 15317 */ 15318 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 15319 host.onInitializeAccessibilityNodeInfoInternal(info); 15320 } 15321 15322 /** 15323 * Called when a child of the host View has requested sending an 15324 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 15325 * to augment the event. 15326 * <p> 15327 * The default implementation behaves as 15328 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15329 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 15330 * the case of no accessibility delegate been set. 15331 * </p> 15332 * 15333 * @param host The View hosting the delegate. 15334 * @param child The child which requests sending the event. 15335 * @param event The event to be sent. 15336 * @return True if the event should be sent 15337 * 15338 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15339 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15340 */ 15341 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 15342 AccessibilityEvent event) { 15343 return host.onRequestSendAccessibilityEventInternal(child, event); 15344 } 15345 15346 /** 15347 * Gets the provider for managing a virtual view hierarchy rooted at this View 15348 * and reported to {@link android.accessibilityservice.AccessibilityService}s 15349 * that explore the window content. 15350 * <p> 15351 * The default implementation behaves as 15352 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 15353 * the case of no accessibility delegate been set. 15354 * </p> 15355 * 15356 * @return The provider. 15357 * 15358 * @see AccessibilityNodeProvider 15359 */ 15360 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 15361 return null; 15362 } 15363 } 15364} 15365