View.java revision dd29f8c4e3db3338bc055302145c3bc51a27566f
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 } 3793 3794 /** 3795 * Called internally by the view system when a new view is getting focus. 3796 * This is what clears the old focus. 3797 */ 3798 void unFocus() { 3799 if (DBG) { 3800 System.out.println(this + " unFocus()"); 3801 } 3802 3803 if ((mPrivateFlags & FOCUSED) != 0) { 3804 mPrivateFlags &= ~FOCUSED; 3805 3806 onFocusChanged(false, 0, null); 3807 refreshDrawableState(); 3808 } 3809 } 3810 3811 /** 3812 * Returns true if this view has focus iteself, or is the ancestor of the 3813 * view that has focus. 3814 * 3815 * @return True if this view has or contains focus, false otherwise. 3816 */ 3817 @ViewDebug.ExportedProperty(category = "focus") 3818 public boolean hasFocus() { 3819 return (mPrivateFlags & FOCUSED) != 0; 3820 } 3821 3822 /** 3823 * Returns true if this view is focusable or if it contains a reachable View 3824 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3825 * is a View whose parents do not block descendants focus. 3826 * 3827 * Only {@link #VISIBLE} views are considered focusable. 3828 * 3829 * @return True if the view is focusable or if the view contains a focusable 3830 * View, false otherwise. 3831 * 3832 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3833 */ 3834 public boolean hasFocusable() { 3835 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3836 } 3837 3838 /** 3839 * Called by the view system when the focus state of this view changes. 3840 * When the focus change event is caused by directional navigation, direction 3841 * and previouslyFocusedRect provide insight into where the focus is coming from. 3842 * When overriding, be sure to call up through to the super class so that 3843 * the standard focus handling will occur. 3844 * 3845 * @param gainFocus True if the View has focus; false otherwise. 3846 * @param direction The direction focus has moved when requestFocus() 3847 * is called to give this view focus. Values are 3848 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3849 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3850 * It may not always apply, in which case use the default. 3851 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3852 * system, of the previously focused view. If applicable, this will be 3853 * passed in as finer grained information about where the focus is coming 3854 * from (in addition to direction). Will be <code>null</code> otherwise. 3855 */ 3856 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3857 if (gainFocus) { 3858 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3859 } 3860 3861 InputMethodManager imm = InputMethodManager.peekInstance(); 3862 if (!gainFocus) { 3863 if (isPressed()) { 3864 setPressed(false); 3865 } 3866 if (imm != null && mAttachInfo != null 3867 && mAttachInfo.mHasWindowFocus) { 3868 imm.focusOut(this); 3869 } 3870 onFocusLost(); 3871 } else if (imm != null && mAttachInfo != null 3872 && mAttachInfo.mHasWindowFocus) { 3873 imm.focusIn(this); 3874 } 3875 3876 invalidate(true); 3877 ListenerInfo li = mListenerInfo; 3878 if (li != null && li.mOnFocusChangeListener != null) { 3879 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 3880 } 3881 3882 if (mAttachInfo != null) { 3883 mAttachInfo.mKeyDispatchState.reset(this); 3884 } 3885 } 3886 3887 /** 3888 * Sends an accessibility event of the given type. If accessiiblity is 3889 * not enabled this method has no effect. The default implementation calls 3890 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 3891 * to populate information about the event source (this View), then calls 3892 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 3893 * populate the text content of the event source including its descendants, 3894 * and last calls 3895 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 3896 * on its parent to resuest sending of the event to interested parties. 3897 * <p> 3898 * If an {@link AccessibilityDelegate} has been specified via calling 3899 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3900 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 3901 * responsible for handling this call. 3902 * </p> 3903 * 3904 * @param eventType The type of the event to send, as defined by several types from 3905 * {@link android.view.accessibility.AccessibilityEvent}, such as 3906 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 3907 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 3908 * 3909 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 3910 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3911 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 3912 * @see AccessibilityDelegate 3913 */ 3914 public void sendAccessibilityEvent(int eventType) { 3915 if (mAccessibilityDelegate != null) { 3916 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 3917 } else { 3918 sendAccessibilityEventInternal(eventType); 3919 } 3920 } 3921 3922 /** 3923 * @see #sendAccessibilityEvent(int) 3924 * 3925 * Note: Called from the default {@link AccessibilityDelegate}. 3926 */ 3927 void sendAccessibilityEventInternal(int eventType) { 3928 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3929 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3930 } 3931 } 3932 3933 /** 3934 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 3935 * takes as an argument an empty {@link AccessibilityEvent} and does not 3936 * perform a check whether accessibility is enabled. 3937 * <p> 3938 * If an {@link AccessibilityDelegate} has been specified via calling 3939 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3940 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 3941 * is responsible for handling this call. 3942 * </p> 3943 * 3944 * @param event The event to send. 3945 * 3946 * @see #sendAccessibilityEvent(int) 3947 */ 3948 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3949 if (mAccessibilityDelegate != null) { 3950 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 3951 } else { 3952 sendAccessibilityEventUncheckedInternal(event); 3953 } 3954 } 3955 3956 /** 3957 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 3958 * 3959 * Note: Called from the default {@link AccessibilityDelegate}. 3960 */ 3961 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 3962 if (!isShown()) { 3963 return; 3964 } 3965 onInitializeAccessibilityEvent(event); 3966 // Only a subset of accessibility events populates text content. 3967 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 3968 dispatchPopulateAccessibilityEvent(event); 3969 } 3970 // In the beginning we called #isShown(), so we know that getParent() is not null. 3971 getParent().requestSendAccessibilityEvent(this, event); 3972 } 3973 3974 /** 3975 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 3976 * to its children for adding their text content to the event. Note that the 3977 * event text is populated in a separate dispatch path since we add to the 3978 * event not only the text of the source but also the text of all its descendants. 3979 * A typical implementation will call 3980 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 3981 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3982 * on each child. Override this method if custom population of the event text 3983 * content is required. 3984 * <p> 3985 * If an {@link AccessibilityDelegate} has been specified via calling 3986 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3987 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 3988 * is responsible for handling this call. 3989 * </p> 3990 * <p> 3991 * <em>Note:</em> Accessibility events of certain types are not dispatched for 3992 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 3993 * </p> 3994 * 3995 * @param event The event. 3996 * 3997 * @return True if the event population was completed. 3998 */ 3999 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4000 if (mAccessibilityDelegate != null) { 4001 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4002 } else { 4003 return dispatchPopulateAccessibilityEventInternal(event); 4004 } 4005 } 4006 4007 /** 4008 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4009 * 4010 * Note: Called from the default {@link AccessibilityDelegate}. 4011 */ 4012 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4013 onPopulateAccessibilityEvent(event); 4014 return false; 4015 } 4016 4017 /** 4018 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4019 * giving a chance to this View to populate the accessibility event with its 4020 * text content. While this method is free to modify event 4021 * attributes other than text content, doing so should normally be performed in 4022 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4023 * <p> 4024 * Example: Adding formatted date string to an accessibility event in addition 4025 * to the text added by the super implementation: 4026 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4027 * super.onPopulateAccessibilityEvent(event); 4028 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4029 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4030 * mCurrentDate.getTimeInMillis(), flags); 4031 * event.getText().add(selectedDateUtterance); 4032 * }</pre> 4033 * <p> 4034 * If an {@link AccessibilityDelegate} has been specified via calling 4035 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4036 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4037 * is responsible for handling this call. 4038 * </p> 4039 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4040 * information to the event, in case the default implementation has basic information to add. 4041 * </p> 4042 * 4043 * @param event The accessibility event which to populate. 4044 * 4045 * @see #sendAccessibilityEvent(int) 4046 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4047 */ 4048 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4049 if (mAccessibilityDelegate != null) { 4050 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4051 } else { 4052 onPopulateAccessibilityEventInternal(event); 4053 } 4054 } 4055 4056 /** 4057 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4058 * 4059 * Note: Called from the default {@link AccessibilityDelegate}. 4060 */ 4061 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4062 4063 } 4064 4065 /** 4066 * Initializes an {@link AccessibilityEvent} with information about 4067 * this View which is the event source. In other words, the source of 4068 * an accessibility event is the view whose state change triggered firing 4069 * the event. 4070 * <p> 4071 * Example: Setting the password property of an event in addition 4072 * to properties set by the super implementation: 4073 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4074 * super.onInitializeAccessibilityEvent(event); 4075 * event.setPassword(true); 4076 * }</pre> 4077 * <p> 4078 * If an {@link AccessibilityDelegate} has been specified via calling 4079 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4080 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4081 * is responsible for handling this call. 4082 * </p> 4083 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4084 * information to the event, in case the default implementation has basic information to add. 4085 * </p> 4086 * @param event The event to initialize. 4087 * 4088 * @see #sendAccessibilityEvent(int) 4089 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4090 */ 4091 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4092 if (mAccessibilityDelegate != null) { 4093 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4094 } else { 4095 onInitializeAccessibilityEventInternal(event); 4096 } 4097 } 4098 4099 /** 4100 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4101 * 4102 * Note: Called from the default {@link AccessibilityDelegate}. 4103 */ 4104 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4105 event.setSource(this); 4106 event.setClassName(View.class.getName()); 4107 event.setPackageName(getContext().getPackageName()); 4108 event.setEnabled(isEnabled()); 4109 event.setContentDescription(mContentDescription); 4110 4111 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4112 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 4113 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4114 FOCUSABLES_ALL); 4115 event.setItemCount(focusablesTempList.size()); 4116 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4117 focusablesTempList.clear(); 4118 } 4119 } 4120 4121 /** 4122 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4123 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4124 * This method is responsible for obtaining an accessibility node info from a 4125 * pool of reusable instances and calling 4126 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4127 * initialize the former. 4128 * <p> 4129 * Note: The client is responsible for recycling the obtained instance by calling 4130 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4131 * </p> 4132 * 4133 * @return A populated {@link AccessibilityNodeInfo}. 4134 * 4135 * @see AccessibilityNodeInfo 4136 */ 4137 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4138 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4139 if (provider != null) { 4140 return provider.createAccessibilityNodeInfo(View.NO_ID); 4141 } else { 4142 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4143 onInitializeAccessibilityNodeInfo(info); 4144 return info; 4145 } 4146 } 4147 4148 /** 4149 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4150 * The base implementation sets: 4151 * <ul> 4152 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4153 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4154 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4155 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4156 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4157 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4158 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4159 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4160 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4161 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4162 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4163 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4164 * </ul> 4165 * <p> 4166 * Subclasses should override this method, call the super implementation, 4167 * and set additional attributes. 4168 * </p> 4169 * <p> 4170 * If an {@link AccessibilityDelegate} has been specified via calling 4171 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4172 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4173 * is responsible for handling this call. 4174 * </p> 4175 * 4176 * @param info The instance to initialize. 4177 */ 4178 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4179 if (mAccessibilityDelegate != null) { 4180 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4181 } else { 4182 onInitializeAccessibilityNodeInfoInternal(info); 4183 } 4184 } 4185 4186 /** 4187 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4188 * 4189 * Note: Called from the default {@link AccessibilityDelegate}. 4190 */ 4191 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4192 Rect bounds = mAttachInfo.mTmpInvalRect; 4193 getDrawingRect(bounds); 4194 info.setBoundsInParent(bounds); 4195 4196 int[] locationOnScreen = mAttachInfo.mInvalidateChildLocation; 4197 getLocationOnScreen(locationOnScreen); 4198 bounds.offsetTo(0, 0); 4199 bounds.offset(locationOnScreen[0], locationOnScreen[1]); 4200 info.setBoundsInScreen(bounds); 4201 4202 if ((mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 4203 ViewParent parent = getParent(); 4204 if (parent instanceof View) { 4205 View parentView = (View) parent; 4206 info.setParent(parentView); 4207 } 4208 } 4209 4210 info.setPackageName(mContext.getPackageName()); 4211 info.setClassName(View.class.getName()); 4212 info.setContentDescription(getContentDescription()); 4213 4214 info.setEnabled(isEnabled()); 4215 info.setClickable(isClickable()); 4216 info.setFocusable(isFocusable()); 4217 info.setFocused(isFocused()); 4218 info.setSelected(isSelected()); 4219 info.setLongClickable(isLongClickable()); 4220 4221 // TODO: These make sense only if we are in an AdapterView but all 4222 // views can be selected. Maybe from accessiiblity perspective 4223 // we should report as selectable view in an AdapterView. 4224 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4225 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4226 4227 if (isFocusable()) { 4228 if (isFocused()) { 4229 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4230 } else { 4231 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4232 } 4233 } 4234 } 4235 4236 /** 4237 * Sets a delegate for implementing accessibility support via compositon as 4238 * opposed to inheritance. The delegate's primary use is for implementing 4239 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4240 * 4241 * @param delegate The delegate instance. 4242 * 4243 * @see AccessibilityDelegate 4244 */ 4245 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4246 mAccessibilityDelegate = delegate; 4247 } 4248 4249 /** 4250 * Gets the provider for managing a virtual view hierarchy rooted at this View 4251 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4252 * that explore the window content. 4253 * <p> 4254 * If this method returns an instance, this instance is responsible for managing 4255 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4256 * View including the one representing the View itself. Similarly the returned 4257 * instance is responsible for performing accessibility actions on any virtual 4258 * view or the root view itself. 4259 * </p> 4260 * <p> 4261 * If an {@link AccessibilityDelegate} has been specified via calling 4262 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4263 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4264 * is responsible for handling this call. 4265 * </p> 4266 * 4267 * @return The provider. 4268 * 4269 * @see AccessibilityNodeProvider 4270 */ 4271 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4272 if (mAccessibilityDelegate != null) { 4273 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4274 } else { 4275 return null; 4276 } 4277 } 4278 4279 /** 4280 * Gets the unique identifier of this view on the screen for accessibility purposes. 4281 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4282 * 4283 * @return The view accessibility id. 4284 * 4285 * @hide 4286 */ 4287 public int getAccessibilityViewId() { 4288 if (mAccessibilityViewId == NO_ID) { 4289 mAccessibilityViewId = sNextAccessibilityViewId++; 4290 } 4291 return mAccessibilityViewId; 4292 } 4293 4294 /** 4295 * Gets the unique identifier of the window in which this View reseides. 4296 * 4297 * @return The window accessibility id. 4298 * 4299 * @hide 4300 */ 4301 public int getAccessibilityWindowId() { 4302 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4303 } 4304 4305 /** 4306 * Gets the {@link View} description. It briefly describes the view and is 4307 * primarily used for accessibility support. Set this property to enable 4308 * better accessibility support for your application. This is especially 4309 * true for views that do not have textual representation (For example, 4310 * ImageButton). 4311 * 4312 * @return The content descriptiopn. 4313 * 4314 * @attr ref android.R.styleable#View_contentDescription 4315 */ 4316 public CharSequence getContentDescription() { 4317 return mContentDescription; 4318 } 4319 4320 /** 4321 * Sets the {@link View} description. It briefly describes the view and is 4322 * primarily used for accessibility support. Set this property to enable 4323 * better accessibility support for your application. This is especially 4324 * true for views that do not have textual representation (For example, 4325 * ImageButton). 4326 * 4327 * @param contentDescription The content description. 4328 * 4329 * @attr ref android.R.styleable#View_contentDescription 4330 */ 4331 @RemotableViewMethod 4332 public void setContentDescription(CharSequence contentDescription) { 4333 mContentDescription = contentDescription; 4334 } 4335 4336 /** 4337 * Invoked whenever this view loses focus, either by losing window focus or by losing 4338 * focus within its window. This method can be used to clear any state tied to the 4339 * focus. For instance, if a button is held pressed with the trackball and the window 4340 * loses focus, this method can be used to cancel the press. 4341 * 4342 * Subclasses of View overriding this method should always call super.onFocusLost(). 4343 * 4344 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4345 * @see #onWindowFocusChanged(boolean) 4346 * 4347 * @hide pending API council approval 4348 */ 4349 protected void onFocusLost() { 4350 resetPressedState(); 4351 } 4352 4353 private void resetPressedState() { 4354 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4355 return; 4356 } 4357 4358 if (isPressed()) { 4359 setPressed(false); 4360 4361 if (!mHasPerformedLongPress) { 4362 removeLongPressCallback(); 4363 } 4364 } 4365 } 4366 4367 /** 4368 * Returns true if this view has focus 4369 * 4370 * @return True if this view has focus, false otherwise. 4371 */ 4372 @ViewDebug.ExportedProperty(category = "focus") 4373 public boolean isFocused() { 4374 return (mPrivateFlags & FOCUSED) != 0; 4375 } 4376 4377 /** 4378 * Find the view in the hierarchy rooted at this view that currently has 4379 * focus. 4380 * 4381 * @return The view that currently has focus, or null if no focused view can 4382 * be found. 4383 */ 4384 public View findFocus() { 4385 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4386 } 4387 4388 /** 4389 * Change whether this view is one of the set of scrollable containers in 4390 * its window. This will be used to determine whether the window can 4391 * resize or must pan when a soft input area is open -- scrollable 4392 * containers allow the window to use resize mode since the container 4393 * will appropriately shrink. 4394 */ 4395 public void setScrollContainer(boolean isScrollContainer) { 4396 if (isScrollContainer) { 4397 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4398 mAttachInfo.mScrollContainers.add(this); 4399 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4400 } 4401 mPrivateFlags |= SCROLL_CONTAINER; 4402 } else { 4403 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4404 mAttachInfo.mScrollContainers.remove(this); 4405 } 4406 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4407 } 4408 } 4409 4410 /** 4411 * Returns the quality of the drawing cache. 4412 * 4413 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4414 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4415 * 4416 * @see #setDrawingCacheQuality(int) 4417 * @see #setDrawingCacheEnabled(boolean) 4418 * @see #isDrawingCacheEnabled() 4419 * 4420 * @attr ref android.R.styleable#View_drawingCacheQuality 4421 */ 4422 public int getDrawingCacheQuality() { 4423 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4424 } 4425 4426 /** 4427 * Set the drawing cache quality of this view. This value is used only when the 4428 * drawing cache is enabled 4429 * 4430 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4431 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4432 * 4433 * @see #getDrawingCacheQuality() 4434 * @see #setDrawingCacheEnabled(boolean) 4435 * @see #isDrawingCacheEnabled() 4436 * 4437 * @attr ref android.R.styleable#View_drawingCacheQuality 4438 */ 4439 public void setDrawingCacheQuality(int quality) { 4440 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 4441 } 4442 4443 /** 4444 * Returns whether the screen should remain on, corresponding to the current 4445 * value of {@link #KEEP_SCREEN_ON}. 4446 * 4447 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 4448 * 4449 * @see #setKeepScreenOn(boolean) 4450 * 4451 * @attr ref android.R.styleable#View_keepScreenOn 4452 */ 4453 public boolean getKeepScreenOn() { 4454 return (mViewFlags & KEEP_SCREEN_ON) != 0; 4455 } 4456 4457 /** 4458 * Controls whether the screen should remain on, modifying the 4459 * value of {@link #KEEP_SCREEN_ON}. 4460 * 4461 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 4462 * 4463 * @see #getKeepScreenOn() 4464 * 4465 * @attr ref android.R.styleable#View_keepScreenOn 4466 */ 4467 public void setKeepScreenOn(boolean keepScreenOn) { 4468 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 4469 } 4470 4471 /** 4472 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4473 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4474 * 4475 * @attr ref android.R.styleable#View_nextFocusLeft 4476 */ 4477 public int getNextFocusLeftId() { 4478 return mNextFocusLeftId; 4479 } 4480 4481 /** 4482 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4483 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 4484 * decide automatically. 4485 * 4486 * @attr ref android.R.styleable#View_nextFocusLeft 4487 */ 4488 public void setNextFocusLeftId(int nextFocusLeftId) { 4489 mNextFocusLeftId = nextFocusLeftId; 4490 } 4491 4492 /** 4493 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4494 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4495 * 4496 * @attr ref android.R.styleable#View_nextFocusRight 4497 */ 4498 public int getNextFocusRightId() { 4499 return mNextFocusRightId; 4500 } 4501 4502 /** 4503 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4504 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 4505 * decide automatically. 4506 * 4507 * @attr ref android.R.styleable#View_nextFocusRight 4508 */ 4509 public void setNextFocusRightId(int nextFocusRightId) { 4510 mNextFocusRightId = nextFocusRightId; 4511 } 4512 4513 /** 4514 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4515 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4516 * 4517 * @attr ref android.R.styleable#View_nextFocusUp 4518 */ 4519 public int getNextFocusUpId() { 4520 return mNextFocusUpId; 4521 } 4522 4523 /** 4524 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4525 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 4526 * decide automatically. 4527 * 4528 * @attr ref android.R.styleable#View_nextFocusUp 4529 */ 4530 public void setNextFocusUpId(int nextFocusUpId) { 4531 mNextFocusUpId = nextFocusUpId; 4532 } 4533 4534 /** 4535 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4536 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4537 * 4538 * @attr ref android.R.styleable#View_nextFocusDown 4539 */ 4540 public int getNextFocusDownId() { 4541 return mNextFocusDownId; 4542 } 4543 4544 /** 4545 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4546 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 4547 * decide automatically. 4548 * 4549 * @attr ref android.R.styleable#View_nextFocusDown 4550 */ 4551 public void setNextFocusDownId(int nextFocusDownId) { 4552 mNextFocusDownId = nextFocusDownId; 4553 } 4554 4555 /** 4556 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4557 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4558 * 4559 * @attr ref android.R.styleable#View_nextFocusForward 4560 */ 4561 public int getNextFocusForwardId() { 4562 return mNextFocusForwardId; 4563 } 4564 4565 /** 4566 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4567 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 4568 * decide automatically. 4569 * 4570 * @attr ref android.R.styleable#View_nextFocusForward 4571 */ 4572 public void setNextFocusForwardId(int nextFocusForwardId) { 4573 mNextFocusForwardId = nextFocusForwardId; 4574 } 4575 4576 /** 4577 * Returns the visibility of this view and all of its ancestors 4578 * 4579 * @return True if this view and all of its ancestors are {@link #VISIBLE} 4580 */ 4581 public boolean isShown() { 4582 View current = this; 4583 //noinspection ConstantConditions 4584 do { 4585 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4586 return false; 4587 } 4588 ViewParent parent = current.mParent; 4589 if (parent == null) { 4590 return false; // We are not attached to the view root 4591 } 4592 if (!(parent instanceof View)) { 4593 return true; 4594 } 4595 current = (View) parent; 4596 } while (current != null); 4597 4598 return false; 4599 } 4600 4601 /** 4602 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 4603 * is set 4604 * 4605 * @param insets Insets for system windows 4606 * 4607 * @return True if this view applied the insets, false otherwise 4608 */ 4609 protected boolean fitSystemWindows(Rect insets) { 4610 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 4611 mPaddingLeft = insets.left; 4612 mPaddingTop = insets.top; 4613 mPaddingRight = insets.right; 4614 mPaddingBottom = insets.bottom; 4615 requestLayout(); 4616 return true; 4617 } 4618 return false; 4619 } 4620 4621 /** 4622 * Set whether or not this view should account for system screen decorations 4623 * such as the status bar and inset its content. This allows this view to be 4624 * positioned in absolute screen coordinates and remain visible to the user. 4625 * 4626 * <p>This should only be used by top-level window decor views. 4627 * 4628 * @param fitSystemWindows true to inset content for system screen decorations, false for 4629 * default behavior. 4630 * 4631 * @attr ref android.R.styleable#View_fitsSystemWindows 4632 */ 4633 public void setFitsSystemWindows(boolean fitSystemWindows) { 4634 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 4635 } 4636 4637 /** 4638 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 4639 * will account for system screen decorations such as the status bar and inset its 4640 * content. This allows the view to be positioned in absolute screen coordinates 4641 * and remain visible to the user. 4642 * 4643 * @return true if this view will adjust its content bounds for system screen decorations. 4644 * 4645 * @attr ref android.R.styleable#View_fitsSystemWindows 4646 */ 4647 public boolean fitsSystemWindows() { 4648 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 4649 } 4650 4651 /** 4652 * Returns the visibility status for this view. 4653 * 4654 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4655 * @attr ref android.R.styleable#View_visibility 4656 */ 4657 @ViewDebug.ExportedProperty(mapping = { 4658 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 4659 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 4660 @ViewDebug.IntToString(from = GONE, to = "GONE") 4661 }) 4662 public int getVisibility() { 4663 return mViewFlags & VISIBILITY_MASK; 4664 } 4665 4666 /** 4667 * Set the enabled state of this view. 4668 * 4669 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4670 * @attr ref android.R.styleable#View_visibility 4671 */ 4672 @RemotableViewMethod 4673 public void setVisibility(int visibility) { 4674 setFlags(visibility, VISIBILITY_MASK); 4675 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 4676 } 4677 4678 /** 4679 * Returns the enabled status for this view. The interpretation of the 4680 * enabled state varies by subclass. 4681 * 4682 * @return True if this view is enabled, false otherwise. 4683 */ 4684 @ViewDebug.ExportedProperty 4685 public boolean isEnabled() { 4686 return (mViewFlags & ENABLED_MASK) == ENABLED; 4687 } 4688 4689 /** 4690 * Set the enabled state of this view. The interpretation of the enabled 4691 * state varies by subclass. 4692 * 4693 * @param enabled True if this view is enabled, false otherwise. 4694 */ 4695 @RemotableViewMethod 4696 public void setEnabled(boolean enabled) { 4697 if (enabled == isEnabled()) return; 4698 4699 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 4700 4701 /* 4702 * The View most likely has to change its appearance, so refresh 4703 * the drawable state. 4704 */ 4705 refreshDrawableState(); 4706 4707 // Invalidate too, since the default behavior for views is to be 4708 // be drawn at 50% alpha rather than to change the drawable. 4709 invalidate(true); 4710 } 4711 4712 /** 4713 * Set whether this view can receive the focus. 4714 * 4715 * Setting this to false will also ensure that this view is not focusable 4716 * in touch mode. 4717 * 4718 * @param focusable If true, this view can receive the focus. 4719 * 4720 * @see #setFocusableInTouchMode(boolean) 4721 * @attr ref android.R.styleable#View_focusable 4722 */ 4723 public void setFocusable(boolean focusable) { 4724 if (!focusable) { 4725 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 4726 } 4727 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 4728 } 4729 4730 /** 4731 * Set whether this view can receive focus while in touch mode. 4732 * 4733 * Setting this to true will also ensure that this view is focusable. 4734 * 4735 * @param focusableInTouchMode If true, this view can receive the focus while 4736 * in touch mode. 4737 * 4738 * @see #setFocusable(boolean) 4739 * @attr ref android.R.styleable#View_focusableInTouchMode 4740 */ 4741 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 4742 // Focusable in touch mode should always be set before the focusable flag 4743 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 4744 // which, in touch mode, will not successfully request focus on this view 4745 // because the focusable in touch mode flag is not set 4746 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 4747 if (focusableInTouchMode) { 4748 setFlags(FOCUSABLE, FOCUSABLE_MASK); 4749 } 4750 } 4751 4752 /** 4753 * Set whether this view should have sound effects enabled for events such as 4754 * clicking and touching. 4755 * 4756 * <p>You may wish to disable sound effects for a view if you already play sounds, 4757 * for instance, a dial key that plays dtmf tones. 4758 * 4759 * @param soundEffectsEnabled whether sound effects are enabled for this view. 4760 * @see #isSoundEffectsEnabled() 4761 * @see #playSoundEffect(int) 4762 * @attr ref android.R.styleable#View_soundEffectsEnabled 4763 */ 4764 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 4765 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 4766 } 4767 4768 /** 4769 * @return whether this view should have sound effects enabled for events such as 4770 * clicking and touching. 4771 * 4772 * @see #setSoundEffectsEnabled(boolean) 4773 * @see #playSoundEffect(int) 4774 * @attr ref android.R.styleable#View_soundEffectsEnabled 4775 */ 4776 @ViewDebug.ExportedProperty 4777 public boolean isSoundEffectsEnabled() { 4778 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 4779 } 4780 4781 /** 4782 * Set whether this view should have haptic feedback for events such as 4783 * long presses. 4784 * 4785 * <p>You may wish to disable haptic feedback if your view already controls 4786 * its own haptic feedback. 4787 * 4788 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 4789 * @see #isHapticFeedbackEnabled() 4790 * @see #performHapticFeedback(int) 4791 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4792 */ 4793 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 4794 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 4795 } 4796 4797 /** 4798 * @return whether this view should have haptic feedback enabled for events 4799 * long presses. 4800 * 4801 * @see #setHapticFeedbackEnabled(boolean) 4802 * @see #performHapticFeedback(int) 4803 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4804 */ 4805 @ViewDebug.ExportedProperty 4806 public boolean isHapticFeedbackEnabled() { 4807 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 4808 } 4809 4810 /** 4811 * Returns the layout direction for this view. 4812 * 4813 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 4814 * {@link #LAYOUT_DIRECTION_RTL}, 4815 * {@link #LAYOUT_DIRECTION_INHERIT} or 4816 * {@link #LAYOUT_DIRECTION_LOCALE}. 4817 * @attr ref android.R.styleable#View_layoutDirection 4818 * 4819 * @hide 4820 */ 4821 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4822 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 4823 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 4824 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 4825 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 4826 }) 4827 public int getLayoutDirection() { 4828 return mViewFlags & LAYOUT_DIRECTION_MASK; 4829 } 4830 4831 /** 4832 * Set the layout direction for this view. This will propagate a reset of layout direction 4833 * resolution to the view's children and resolve layout direction for this view. 4834 * 4835 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 4836 * {@link #LAYOUT_DIRECTION_RTL}, 4837 * {@link #LAYOUT_DIRECTION_INHERIT} or 4838 * {@link #LAYOUT_DIRECTION_LOCALE}. 4839 * 4840 * @attr ref android.R.styleable#View_layoutDirection 4841 * 4842 * @hide 4843 */ 4844 @RemotableViewMethod 4845 public void setLayoutDirection(int layoutDirection) { 4846 if (getLayoutDirection() != layoutDirection) { 4847 resetResolvedLayoutDirection(); 4848 // Setting the flag will also request a layout. 4849 setFlags(layoutDirection, LAYOUT_DIRECTION_MASK); 4850 } 4851 } 4852 4853 /** 4854 * Returns the resolved layout direction for this view. 4855 * 4856 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 4857 * {@link #LAYOUT_DIRECTION_LTR} id the layout direction is not RTL. 4858 * 4859 * @hide 4860 */ 4861 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4862 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 4863 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 4864 }) 4865 public int getResolvedLayoutDirection() { 4866 resolveLayoutDirectionIfNeeded(); 4867 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 4868 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 4869 } 4870 4871 /** 4872 * <p>Indicates whether or not this view's layout is right-to-left. This is resolved from 4873 * layout attribute and/or the inherited value from the parent.</p> 4874 * 4875 * @return true if the layout is right-to-left. 4876 * 4877 * @hide 4878 */ 4879 @ViewDebug.ExportedProperty(category = "layout") 4880 public boolean isLayoutRtl() { 4881 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 4882 } 4883 4884 /** 4885 * If this view doesn't do any drawing on its own, set this flag to 4886 * allow further optimizations. By default, this flag is not set on 4887 * View, but could be set on some View subclasses such as ViewGroup. 4888 * 4889 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 4890 * you should clear this flag. 4891 * 4892 * @param willNotDraw whether or not this View draw on its own 4893 */ 4894 public void setWillNotDraw(boolean willNotDraw) { 4895 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 4896 } 4897 4898 /** 4899 * Returns whether or not this View draws on its own. 4900 * 4901 * @return true if this view has nothing to draw, false otherwise 4902 */ 4903 @ViewDebug.ExportedProperty(category = "drawing") 4904 public boolean willNotDraw() { 4905 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 4906 } 4907 4908 /** 4909 * When a View's drawing cache is enabled, drawing is redirected to an 4910 * offscreen bitmap. Some views, like an ImageView, must be able to 4911 * bypass this mechanism if they already draw a single bitmap, to avoid 4912 * unnecessary usage of the memory. 4913 * 4914 * @param willNotCacheDrawing true if this view does not cache its 4915 * drawing, false otherwise 4916 */ 4917 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 4918 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 4919 } 4920 4921 /** 4922 * Returns whether or not this View can cache its drawing or not. 4923 * 4924 * @return true if this view does not cache its drawing, false otherwise 4925 */ 4926 @ViewDebug.ExportedProperty(category = "drawing") 4927 public boolean willNotCacheDrawing() { 4928 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 4929 } 4930 4931 /** 4932 * Indicates whether this view reacts to click events or not. 4933 * 4934 * @return true if the view is clickable, false otherwise 4935 * 4936 * @see #setClickable(boolean) 4937 * @attr ref android.R.styleable#View_clickable 4938 */ 4939 @ViewDebug.ExportedProperty 4940 public boolean isClickable() { 4941 return (mViewFlags & CLICKABLE) == CLICKABLE; 4942 } 4943 4944 /** 4945 * Enables or disables click events for this view. When a view 4946 * is clickable it will change its state to "pressed" on every click. 4947 * Subclasses should set the view clickable to visually react to 4948 * user's clicks. 4949 * 4950 * @param clickable true to make the view clickable, false otherwise 4951 * 4952 * @see #isClickable() 4953 * @attr ref android.R.styleable#View_clickable 4954 */ 4955 public void setClickable(boolean clickable) { 4956 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 4957 } 4958 4959 /** 4960 * Indicates whether this view reacts to long click events or not. 4961 * 4962 * @return true if the view is long clickable, false otherwise 4963 * 4964 * @see #setLongClickable(boolean) 4965 * @attr ref android.R.styleable#View_longClickable 4966 */ 4967 public boolean isLongClickable() { 4968 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 4969 } 4970 4971 /** 4972 * Enables or disables long click events for this view. When a view is long 4973 * clickable it reacts to the user holding down the button for a longer 4974 * duration than a tap. This event can either launch the listener or a 4975 * context menu. 4976 * 4977 * @param longClickable true to make the view long clickable, false otherwise 4978 * @see #isLongClickable() 4979 * @attr ref android.R.styleable#View_longClickable 4980 */ 4981 public void setLongClickable(boolean longClickable) { 4982 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 4983 } 4984 4985 /** 4986 * Sets the pressed state for this view. 4987 * 4988 * @see #isClickable() 4989 * @see #setClickable(boolean) 4990 * 4991 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 4992 * the View's internal state from a previously set "pressed" state. 4993 */ 4994 public void setPressed(boolean pressed) { 4995 if (pressed) { 4996 mPrivateFlags |= PRESSED; 4997 } else { 4998 mPrivateFlags &= ~PRESSED; 4999 } 5000 refreshDrawableState(); 5001 dispatchSetPressed(pressed); 5002 } 5003 5004 /** 5005 * Dispatch setPressed to all of this View's children. 5006 * 5007 * @see #setPressed(boolean) 5008 * 5009 * @param pressed The new pressed state 5010 */ 5011 protected void dispatchSetPressed(boolean pressed) { 5012 } 5013 5014 /** 5015 * Indicates whether the view is currently in pressed state. Unless 5016 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5017 * the pressed state. 5018 * 5019 * @see #setPressed(boolean) 5020 * @see #isClickable() 5021 * @see #setClickable(boolean) 5022 * 5023 * @return true if the view is currently pressed, false otherwise 5024 */ 5025 public boolean isPressed() { 5026 return (mPrivateFlags & PRESSED) == PRESSED; 5027 } 5028 5029 /** 5030 * Indicates whether this view will save its state (that is, 5031 * whether its {@link #onSaveInstanceState} method will be called). 5032 * 5033 * @return Returns true if the view state saving is enabled, else false. 5034 * 5035 * @see #setSaveEnabled(boolean) 5036 * @attr ref android.R.styleable#View_saveEnabled 5037 */ 5038 public boolean isSaveEnabled() { 5039 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5040 } 5041 5042 /** 5043 * Controls whether the saving of this view's state is 5044 * enabled (that is, whether its {@link #onSaveInstanceState} method 5045 * will be called). Note that even if freezing is enabled, the 5046 * view still must have an id assigned to it (via {@link #setId(int)}) 5047 * for its state to be saved. This flag can only disable the 5048 * saving of this view; any child views may still have their state saved. 5049 * 5050 * @param enabled Set to false to <em>disable</em> state saving, or true 5051 * (the default) to allow it. 5052 * 5053 * @see #isSaveEnabled() 5054 * @see #setId(int) 5055 * @see #onSaveInstanceState() 5056 * @attr ref android.R.styleable#View_saveEnabled 5057 */ 5058 public void setSaveEnabled(boolean enabled) { 5059 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5060 } 5061 5062 /** 5063 * Gets whether the framework should discard touches when the view's 5064 * window is obscured by another visible window. 5065 * Refer to the {@link View} security documentation for more details. 5066 * 5067 * @return True if touch filtering is enabled. 5068 * 5069 * @see #setFilterTouchesWhenObscured(boolean) 5070 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5071 */ 5072 @ViewDebug.ExportedProperty 5073 public boolean getFilterTouchesWhenObscured() { 5074 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5075 } 5076 5077 /** 5078 * Sets whether the framework should discard touches when the view's 5079 * window is obscured by another visible window. 5080 * Refer to the {@link View} security documentation for more details. 5081 * 5082 * @param enabled True if touch filtering should be enabled. 5083 * 5084 * @see #getFilterTouchesWhenObscured 5085 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5086 */ 5087 public void setFilterTouchesWhenObscured(boolean enabled) { 5088 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5089 FILTER_TOUCHES_WHEN_OBSCURED); 5090 } 5091 5092 /** 5093 * Indicates whether the entire hierarchy under this view will save its 5094 * state when a state saving traversal occurs from its parent. The default 5095 * is true; if false, these views will not be saved unless 5096 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5097 * 5098 * @return Returns true if the view state saving from parent is enabled, else false. 5099 * 5100 * @see #setSaveFromParentEnabled(boolean) 5101 */ 5102 public boolean isSaveFromParentEnabled() { 5103 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5104 } 5105 5106 /** 5107 * Controls whether the entire hierarchy under this view will save its 5108 * state when a state saving traversal occurs from its parent. The default 5109 * is true; if false, these views will not be saved unless 5110 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5111 * 5112 * @param enabled Set to false to <em>disable</em> state saving, or true 5113 * (the default) to allow it. 5114 * 5115 * @see #isSaveFromParentEnabled() 5116 * @see #setId(int) 5117 * @see #onSaveInstanceState() 5118 */ 5119 public void setSaveFromParentEnabled(boolean enabled) { 5120 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5121 } 5122 5123 5124 /** 5125 * Returns whether this View is able to take focus. 5126 * 5127 * @return True if this view can take focus, or false otherwise. 5128 * @attr ref android.R.styleable#View_focusable 5129 */ 5130 @ViewDebug.ExportedProperty(category = "focus") 5131 public final boolean isFocusable() { 5132 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5133 } 5134 5135 /** 5136 * When a view is focusable, it may not want to take focus when in touch mode. 5137 * For example, a button would like focus when the user is navigating via a D-pad 5138 * so that the user can click on it, but once the user starts touching the screen, 5139 * the button shouldn't take focus 5140 * @return Whether the view is focusable in touch mode. 5141 * @attr ref android.R.styleable#View_focusableInTouchMode 5142 */ 5143 @ViewDebug.ExportedProperty 5144 public final boolean isFocusableInTouchMode() { 5145 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5146 } 5147 5148 /** 5149 * Find the nearest view in the specified direction that can take focus. 5150 * This does not actually give focus to that view. 5151 * 5152 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5153 * 5154 * @return The nearest focusable in the specified direction, or null if none 5155 * can be found. 5156 */ 5157 public View focusSearch(int direction) { 5158 if (mParent != null) { 5159 return mParent.focusSearch(this, direction); 5160 } else { 5161 return null; 5162 } 5163 } 5164 5165 /** 5166 * This method is the last chance for the focused view and its ancestors to 5167 * respond to an arrow key. This is called when the focused view did not 5168 * consume the key internally, nor could the view system find a new view in 5169 * the requested direction to give focus to. 5170 * 5171 * @param focused The currently focused view. 5172 * @param direction The direction focus wants to move. One of FOCUS_UP, 5173 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5174 * @return True if the this view consumed this unhandled move. 5175 */ 5176 public boolean dispatchUnhandledMove(View focused, int direction) { 5177 return false; 5178 } 5179 5180 /** 5181 * If a user manually specified the next view id for a particular direction, 5182 * use the root to look up the view. 5183 * @param root The root view of the hierarchy containing this view. 5184 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5185 * or FOCUS_BACKWARD. 5186 * @return The user specified next view, or null if there is none. 5187 */ 5188 View findUserSetNextFocus(View root, int direction) { 5189 switch (direction) { 5190 case FOCUS_LEFT: 5191 if (mNextFocusLeftId == View.NO_ID) return null; 5192 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5193 case FOCUS_RIGHT: 5194 if (mNextFocusRightId == View.NO_ID) return null; 5195 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5196 case FOCUS_UP: 5197 if (mNextFocusUpId == View.NO_ID) return null; 5198 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5199 case FOCUS_DOWN: 5200 if (mNextFocusDownId == View.NO_ID) return null; 5201 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5202 case FOCUS_FORWARD: 5203 if (mNextFocusForwardId == View.NO_ID) return null; 5204 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5205 case FOCUS_BACKWARD: { 5206 final int id = mID; 5207 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5208 @Override 5209 public boolean apply(View t) { 5210 return t.mNextFocusForwardId == id; 5211 } 5212 }); 5213 } 5214 } 5215 return null; 5216 } 5217 5218 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5219 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5220 @Override 5221 public boolean apply(View t) { 5222 return t.mID == childViewId; 5223 } 5224 }); 5225 5226 if (result == null) { 5227 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5228 + "by user for id " + childViewId); 5229 } 5230 return result; 5231 } 5232 5233 /** 5234 * Find and return all focusable views that are descendants of this view, 5235 * possibly including this view if it is focusable itself. 5236 * 5237 * @param direction The direction of the focus 5238 * @return A list of focusable views 5239 */ 5240 public ArrayList<View> getFocusables(int direction) { 5241 ArrayList<View> result = new ArrayList<View>(24); 5242 addFocusables(result, direction); 5243 return result; 5244 } 5245 5246 /** 5247 * Add any focusable views that are descendants of this view (possibly 5248 * including this view if it is focusable itself) to views. If we are in touch mode, 5249 * only add views that are also focusable in touch mode. 5250 * 5251 * @param views Focusable views found so far 5252 * @param direction The direction of the focus 5253 */ 5254 public void addFocusables(ArrayList<View> views, int direction) { 5255 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 5256 } 5257 5258 /** 5259 * Adds any focusable views that are descendants of this view (possibly 5260 * including this view if it is focusable itself) to views. This method 5261 * adds all focusable views regardless if we are in touch mode or 5262 * only views focusable in touch mode if we are in touch mode depending on 5263 * the focusable mode paramater. 5264 * 5265 * @param views Focusable views found so far or null if all we are interested is 5266 * the number of focusables. 5267 * @param direction The direction of the focus. 5268 * @param focusableMode The type of focusables to be added. 5269 * 5270 * @see #FOCUSABLES_ALL 5271 * @see #FOCUSABLES_TOUCH_MODE 5272 */ 5273 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 5274 if (!isFocusable()) { 5275 return; 5276 } 5277 5278 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 5279 isInTouchMode() && !isFocusableInTouchMode()) { 5280 return; 5281 } 5282 5283 if (views != null) { 5284 views.add(this); 5285 } 5286 } 5287 5288 /** 5289 * Finds the Views that contain given text. The containment is case insensitive. 5290 * The search is performed by either the text that the View renders or the content 5291 * description that describes the view for accessibility purposes and the view does 5292 * not render or both. Clients can specify how the search is to be performed via 5293 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 5294 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 5295 * 5296 * @param outViews The output list of matching Views. 5297 * @param searched The text to match against. 5298 * 5299 * @see #FIND_VIEWS_WITH_TEXT 5300 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 5301 * @see #setContentDescription(CharSequence) 5302 */ 5303 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 5304 if (getAccessibilityNodeProvider() != null) { 5305 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 5306 outViews.add(this); 5307 } 5308 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 5309 && !TextUtils.isEmpty(searched) && !TextUtils.isEmpty(mContentDescription)) { 5310 String searchedLowerCase = searched.toString().toLowerCase(); 5311 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 5312 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 5313 outViews.add(this); 5314 } 5315 } 5316 } 5317 5318 /** 5319 * Find and return all touchable views that are descendants of this view, 5320 * possibly including this view if it is touchable itself. 5321 * 5322 * @return A list of touchable views 5323 */ 5324 public ArrayList<View> getTouchables() { 5325 ArrayList<View> result = new ArrayList<View>(); 5326 addTouchables(result); 5327 return result; 5328 } 5329 5330 /** 5331 * Add any touchable views that are descendants of this view (possibly 5332 * including this view if it is touchable itself) to views. 5333 * 5334 * @param views Touchable views found so far 5335 */ 5336 public void addTouchables(ArrayList<View> views) { 5337 final int viewFlags = mViewFlags; 5338 5339 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 5340 && (viewFlags & ENABLED_MASK) == ENABLED) { 5341 views.add(this); 5342 } 5343 } 5344 5345 /** 5346 * Call this to try to give focus to a specific view or to one of its 5347 * descendants. 5348 * 5349 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5350 * false), or if it is focusable and it is not focusable in touch mode 5351 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5352 * 5353 * See also {@link #focusSearch(int)}, which is what you call to say that you 5354 * have focus, and you want your parent to look for the next one. 5355 * 5356 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 5357 * {@link #FOCUS_DOWN} and <code>null</code>. 5358 * 5359 * @return Whether this view or one of its descendants actually took focus. 5360 */ 5361 public final boolean requestFocus() { 5362 return requestFocus(View.FOCUS_DOWN); 5363 } 5364 5365 5366 /** 5367 * Call this to try to give focus to a specific view or to one of its 5368 * descendants and give it a hint about what direction focus is heading. 5369 * 5370 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5371 * false), or if it is focusable and it is not focusable in touch mode 5372 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5373 * 5374 * See also {@link #focusSearch(int)}, which is what you call to say that you 5375 * have focus, and you want your parent to look for the next one. 5376 * 5377 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 5378 * <code>null</code> set for the previously focused rectangle. 5379 * 5380 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5381 * @return Whether this view or one of its descendants actually took focus. 5382 */ 5383 public final boolean requestFocus(int direction) { 5384 return requestFocus(direction, null); 5385 } 5386 5387 /** 5388 * Call this to try to give focus to a specific view or to one of its descendants 5389 * and give it hints about the direction and a specific rectangle that the focus 5390 * is coming from. The rectangle can help give larger views a finer grained hint 5391 * about where focus is coming from, and therefore, where to show selection, or 5392 * forward focus change internally. 5393 * 5394 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5395 * false), or if it is focusable and it is not focusable in touch mode 5396 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5397 * 5398 * A View will not take focus if it is not visible. 5399 * 5400 * A View will not take focus if one of its parents has 5401 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 5402 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 5403 * 5404 * See also {@link #focusSearch(int)}, which is what you call to say that you 5405 * have focus, and you want your parent to look for the next one. 5406 * 5407 * You may wish to override this method if your custom {@link View} has an internal 5408 * {@link View} that it wishes to forward the request to. 5409 * 5410 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5411 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 5412 * to give a finer grained hint about where focus is coming from. May be null 5413 * if there is no hint. 5414 * @return Whether this view or one of its descendants actually took focus. 5415 */ 5416 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 5417 // need to be focusable 5418 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 5419 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5420 return false; 5421 } 5422 5423 // need to be focusable in touch mode if in touch mode 5424 if (isInTouchMode() && 5425 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 5426 return false; 5427 } 5428 5429 // need to not have any parents blocking us 5430 if (hasAncestorThatBlocksDescendantFocus()) { 5431 return false; 5432 } 5433 5434 handleFocusGainInternal(direction, previouslyFocusedRect); 5435 return true; 5436 } 5437 5438 /** Gets the ViewAncestor, or null if not attached. */ 5439 /*package*/ ViewRootImpl getViewRootImpl() { 5440 View root = getRootView(); 5441 return root != null ? (ViewRootImpl)root.getParent() : null; 5442 } 5443 5444 /** 5445 * Call this to try to give focus to a specific view or to one of its descendants. This is a 5446 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 5447 * touch mode to request focus when they are touched. 5448 * 5449 * @return Whether this view or one of its descendants actually took focus. 5450 * 5451 * @see #isInTouchMode() 5452 * 5453 */ 5454 public final boolean requestFocusFromTouch() { 5455 // Leave touch mode if we need to 5456 if (isInTouchMode()) { 5457 ViewRootImpl viewRoot = getViewRootImpl(); 5458 if (viewRoot != null) { 5459 viewRoot.ensureTouchMode(false); 5460 } 5461 } 5462 return requestFocus(View.FOCUS_DOWN); 5463 } 5464 5465 /** 5466 * @return Whether any ancestor of this view blocks descendant focus. 5467 */ 5468 private boolean hasAncestorThatBlocksDescendantFocus() { 5469 ViewParent ancestor = mParent; 5470 while (ancestor instanceof ViewGroup) { 5471 final ViewGroup vgAncestor = (ViewGroup) ancestor; 5472 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 5473 return true; 5474 } else { 5475 ancestor = vgAncestor.getParent(); 5476 } 5477 } 5478 return false; 5479 } 5480 5481 /** 5482 * @hide 5483 */ 5484 public void dispatchStartTemporaryDetach() { 5485 onStartTemporaryDetach(); 5486 } 5487 5488 /** 5489 * This is called when a container is going to temporarily detach a child, with 5490 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 5491 * It will either be followed by {@link #onFinishTemporaryDetach()} or 5492 * {@link #onDetachedFromWindow()} when the container is done. 5493 */ 5494 public void onStartTemporaryDetach() { 5495 removeUnsetPressCallback(); 5496 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 5497 } 5498 5499 /** 5500 * @hide 5501 */ 5502 public void dispatchFinishTemporaryDetach() { 5503 onFinishTemporaryDetach(); 5504 } 5505 5506 /** 5507 * Called after {@link #onStartTemporaryDetach} when the container is done 5508 * changing the view. 5509 */ 5510 public void onFinishTemporaryDetach() { 5511 } 5512 5513 /** 5514 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 5515 * for this view's window. Returns null if the view is not currently attached 5516 * to the window. Normally you will not need to use this directly, but 5517 * just use the standard high-level event callbacks like 5518 * {@link #onKeyDown(int, KeyEvent)}. 5519 */ 5520 public KeyEvent.DispatcherState getKeyDispatcherState() { 5521 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 5522 } 5523 5524 /** 5525 * Dispatch a key event before it is processed by any input method 5526 * associated with the view hierarchy. This can be used to intercept 5527 * key events in special situations before the IME consumes them; a 5528 * typical example would be handling the BACK key to update the application's 5529 * UI instead of allowing the IME to see it and close itself. 5530 * 5531 * @param event The key event to be dispatched. 5532 * @return True if the event was handled, false otherwise. 5533 */ 5534 public boolean dispatchKeyEventPreIme(KeyEvent event) { 5535 return onKeyPreIme(event.getKeyCode(), event); 5536 } 5537 5538 /** 5539 * Dispatch a key event to the next view on the focus path. This path runs 5540 * from the top of the view tree down to the currently focused view. If this 5541 * view has focus, it will dispatch to itself. Otherwise it will dispatch 5542 * the next node down the focus path. This method also fires any key 5543 * listeners. 5544 * 5545 * @param event The key event to be dispatched. 5546 * @return True if the event was handled, false otherwise. 5547 */ 5548 public boolean dispatchKeyEvent(KeyEvent event) { 5549 if (mInputEventConsistencyVerifier != null) { 5550 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 5551 } 5552 5553 // Give any attached key listener a first crack at the event. 5554 //noinspection SimplifiableIfStatement 5555 ListenerInfo li = mListenerInfo; 5556 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5557 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 5558 return true; 5559 } 5560 5561 if (event.dispatch(this, mAttachInfo != null 5562 ? mAttachInfo.mKeyDispatchState : null, this)) { 5563 return true; 5564 } 5565 5566 if (mInputEventConsistencyVerifier != null) { 5567 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5568 } 5569 return false; 5570 } 5571 5572 /** 5573 * Dispatches a key shortcut event. 5574 * 5575 * @param event The key event to be dispatched. 5576 * @return True if the event was handled by the view, false otherwise. 5577 */ 5578 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 5579 return onKeyShortcut(event.getKeyCode(), event); 5580 } 5581 5582 /** 5583 * Pass the touch screen motion event down to the target view, or this 5584 * view if it is the target. 5585 * 5586 * @param event The motion event to be dispatched. 5587 * @return True if the event was handled by the view, false otherwise. 5588 */ 5589 public boolean dispatchTouchEvent(MotionEvent event) { 5590 if (mInputEventConsistencyVerifier != null) { 5591 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 5592 } 5593 5594 if (onFilterTouchEventForSecurity(event)) { 5595 //noinspection SimplifiableIfStatement 5596 ListenerInfo li = mListenerInfo; 5597 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5598 && li.mOnTouchListener.onTouch(this, event)) { 5599 return true; 5600 } 5601 5602 if (onTouchEvent(event)) { 5603 return true; 5604 } 5605 } 5606 5607 if (mInputEventConsistencyVerifier != null) { 5608 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5609 } 5610 return false; 5611 } 5612 5613 /** 5614 * Filter the touch event to apply security policies. 5615 * 5616 * @param event The motion event to be filtered. 5617 * @return True if the event should be dispatched, false if the event should be dropped. 5618 * 5619 * @see #getFilterTouchesWhenObscured 5620 */ 5621 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 5622 //noinspection RedundantIfStatement 5623 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 5624 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 5625 // Window is obscured, drop this touch. 5626 return false; 5627 } 5628 return true; 5629 } 5630 5631 /** 5632 * Pass a trackball motion event down to the focused view. 5633 * 5634 * @param event The motion event to be dispatched. 5635 * @return True if the event was handled by the view, false otherwise. 5636 */ 5637 public boolean dispatchTrackballEvent(MotionEvent event) { 5638 if (mInputEventConsistencyVerifier != null) { 5639 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 5640 } 5641 5642 return onTrackballEvent(event); 5643 } 5644 5645 /** 5646 * Dispatch a generic motion event. 5647 * <p> 5648 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5649 * are delivered to the view under the pointer. All other generic motion events are 5650 * delivered to the focused view. Hover events are handled specially and are delivered 5651 * to {@link #onHoverEvent(MotionEvent)}. 5652 * </p> 5653 * 5654 * @param event The motion event to be dispatched. 5655 * @return True if the event was handled by the view, false otherwise. 5656 */ 5657 public boolean dispatchGenericMotionEvent(MotionEvent event) { 5658 if (mInputEventConsistencyVerifier != null) { 5659 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 5660 } 5661 5662 final int source = event.getSource(); 5663 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5664 final int action = event.getAction(); 5665 if (action == MotionEvent.ACTION_HOVER_ENTER 5666 || action == MotionEvent.ACTION_HOVER_MOVE 5667 || action == MotionEvent.ACTION_HOVER_EXIT) { 5668 if (dispatchHoverEvent(event)) { 5669 return true; 5670 } 5671 } else if (dispatchGenericPointerEvent(event)) { 5672 return true; 5673 } 5674 } else if (dispatchGenericFocusedEvent(event)) { 5675 return true; 5676 } 5677 5678 if (dispatchGenericMotionEventInternal(event)) { 5679 return true; 5680 } 5681 5682 if (mInputEventConsistencyVerifier != null) { 5683 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5684 } 5685 return false; 5686 } 5687 5688 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 5689 //noinspection SimplifiableIfStatement 5690 ListenerInfo li = mListenerInfo; 5691 if (li != null && li.mOnGenericMotionListener != null 5692 && (mViewFlags & ENABLED_MASK) == ENABLED 5693 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 5694 return true; 5695 } 5696 5697 if (onGenericMotionEvent(event)) { 5698 return true; 5699 } 5700 5701 if (mInputEventConsistencyVerifier != null) { 5702 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5703 } 5704 return false; 5705 } 5706 5707 /** 5708 * Dispatch a hover event. 5709 * <p> 5710 * Do not call this method directly. 5711 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5712 * </p> 5713 * 5714 * @param event The motion event to be dispatched. 5715 * @return True if the event was handled by the view, false otherwise. 5716 */ 5717 protected boolean dispatchHoverEvent(MotionEvent event) { 5718 //noinspection SimplifiableIfStatement 5719 ListenerInfo li = mListenerInfo; 5720 if (li != null && li.mOnHoverListener != null 5721 && (mViewFlags & ENABLED_MASK) == ENABLED 5722 && li.mOnHoverListener.onHover(this, event)) { 5723 return true; 5724 } 5725 5726 return onHoverEvent(event); 5727 } 5728 5729 /** 5730 * Returns true if the view has a child to which it has recently sent 5731 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 5732 * it does not have a hovered child, then it must be the innermost hovered view. 5733 * @hide 5734 */ 5735 protected boolean hasHoveredChild() { 5736 return false; 5737 } 5738 5739 /** 5740 * Dispatch a generic motion event to the view under the first pointer. 5741 * <p> 5742 * Do not call this method directly. 5743 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5744 * </p> 5745 * 5746 * @param event The motion event to be dispatched. 5747 * @return True if the event was handled by the view, false otherwise. 5748 */ 5749 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 5750 return false; 5751 } 5752 5753 /** 5754 * Dispatch a generic motion event to the currently focused view. 5755 * <p> 5756 * Do not call this method directly. 5757 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5758 * </p> 5759 * 5760 * @param event The motion event to be dispatched. 5761 * @return True if the event was handled by the view, false otherwise. 5762 */ 5763 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 5764 return false; 5765 } 5766 5767 /** 5768 * Dispatch a pointer event. 5769 * <p> 5770 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 5771 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 5772 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 5773 * and should not be expected to handle other pointing device features. 5774 * </p> 5775 * 5776 * @param event The motion event to be dispatched. 5777 * @return True if the event was handled by the view, false otherwise. 5778 * @hide 5779 */ 5780 public final boolean dispatchPointerEvent(MotionEvent event) { 5781 if (event.isTouchEvent()) { 5782 return dispatchTouchEvent(event); 5783 } else { 5784 return dispatchGenericMotionEvent(event); 5785 } 5786 } 5787 5788 /** 5789 * Called when the window containing this view gains or loses window focus. 5790 * ViewGroups should override to route to their children. 5791 * 5792 * @param hasFocus True if the window containing this view now has focus, 5793 * false otherwise. 5794 */ 5795 public void dispatchWindowFocusChanged(boolean hasFocus) { 5796 onWindowFocusChanged(hasFocus); 5797 } 5798 5799 /** 5800 * Called when the window containing this view gains or loses focus. Note 5801 * that this is separate from view focus: to receive key events, both 5802 * your view and its window must have focus. If a window is displayed 5803 * on top of yours that takes input focus, then your own window will lose 5804 * focus but the view focus will remain unchanged. 5805 * 5806 * @param hasWindowFocus True if the window containing this view now has 5807 * focus, false otherwise. 5808 */ 5809 public void onWindowFocusChanged(boolean hasWindowFocus) { 5810 InputMethodManager imm = InputMethodManager.peekInstance(); 5811 if (!hasWindowFocus) { 5812 if (isPressed()) { 5813 setPressed(false); 5814 } 5815 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5816 imm.focusOut(this); 5817 } 5818 removeLongPressCallback(); 5819 removeTapCallback(); 5820 onFocusLost(); 5821 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5822 imm.focusIn(this); 5823 } 5824 refreshDrawableState(); 5825 } 5826 5827 /** 5828 * Returns true if this view is in a window that currently has window focus. 5829 * Note that this is not the same as the view itself having focus. 5830 * 5831 * @return True if this view is in a window that currently has window focus. 5832 */ 5833 public boolean hasWindowFocus() { 5834 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 5835 } 5836 5837 /** 5838 * Dispatch a view visibility change down the view hierarchy. 5839 * ViewGroups should override to route to their children. 5840 * @param changedView The view whose visibility changed. Could be 'this' or 5841 * an ancestor view. 5842 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5843 * {@link #INVISIBLE} or {@link #GONE}. 5844 */ 5845 protected void dispatchVisibilityChanged(View changedView, int visibility) { 5846 onVisibilityChanged(changedView, visibility); 5847 } 5848 5849 /** 5850 * Called when the visibility of the view or an ancestor of the view is changed. 5851 * @param changedView The view whose visibility changed. Could be 'this' or 5852 * an ancestor view. 5853 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5854 * {@link #INVISIBLE} or {@link #GONE}. 5855 */ 5856 protected void onVisibilityChanged(View changedView, int visibility) { 5857 if (visibility == VISIBLE) { 5858 if (mAttachInfo != null) { 5859 initialAwakenScrollBars(); 5860 } else { 5861 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 5862 } 5863 } 5864 } 5865 5866 /** 5867 * Dispatch a hint about whether this view is displayed. For instance, when 5868 * a View moves out of the screen, it might receives a display hint indicating 5869 * the view is not displayed. Applications should not <em>rely</em> on this hint 5870 * as there is no guarantee that they will receive one. 5871 * 5872 * @param hint A hint about whether or not this view is displayed: 5873 * {@link #VISIBLE} or {@link #INVISIBLE}. 5874 */ 5875 public void dispatchDisplayHint(int hint) { 5876 onDisplayHint(hint); 5877 } 5878 5879 /** 5880 * Gives this view a hint about whether is displayed or not. For instance, when 5881 * a View moves out of the screen, it might receives a display hint indicating 5882 * the view is not displayed. Applications should not <em>rely</em> on this hint 5883 * as there is no guarantee that they will receive one. 5884 * 5885 * @param hint A hint about whether or not this view is displayed: 5886 * {@link #VISIBLE} or {@link #INVISIBLE}. 5887 */ 5888 protected void onDisplayHint(int hint) { 5889 } 5890 5891 /** 5892 * Dispatch a window visibility change down the view hierarchy. 5893 * ViewGroups should override to route to their children. 5894 * 5895 * @param visibility The new visibility of the window. 5896 * 5897 * @see #onWindowVisibilityChanged(int) 5898 */ 5899 public void dispatchWindowVisibilityChanged(int visibility) { 5900 onWindowVisibilityChanged(visibility); 5901 } 5902 5903 /** 5904 * Called when the window containing has change its visibility 5905 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 5906 * that this tells you whether or not your window is being made visible 5907 * to the window manager; this does <em>not</em> tell you whether or not 5908 * your window is obscured by other windows on the screen, even if it 5909 * is itself visible. 5910 * 5911 * @param visibility The new visibility of the window. 5912 */ 5913 protected void onWindowVisibilityChanged(int visibility) { 5914 if (visibility == VISIBLE) { 5915 initialAwakenScrollBars(); 5916 } 5917 } 5918 5919 /** 5920 * Returns the current visibility of the window this view is attached to 5921 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 5922 * 5923 * @return Returns the current visibility of the view's window. 5924 */ 5925 public int getWindowVisibility() { 5926 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 5927 } 5928 5929 /** 5930 * Retrieve the overall visible display size in which the window this view is 5931 * attached to has been positioned in. This takes into account screen 5932 * decorations above the window, for both cases where the window itself 5933 * is being position inside of them or the window is being placed under 5934 * then and covered insets are used for the window to position its content 5935 * inside. In effect, this tells you the available area where content can 5936 * be placed and remain visible to users. 5937 * 5938 * <p>This function requires an IPC back to the window manager to retrieve 5939 * the requested information, so should not be used in performance critical 5940 * code like drawing. 5941 * 5942 * @param outRect Filled in with the visible display frame. If the view 5943 * is not attached to a window, this is simply the raw display size. 5944 */ 5945 public void getWindowVisibleDisplayFrame(Rect outRect) { 5946 if (mAttachInfo != null) { 5947 try { 5948 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 5949 } catch (RemoteException e) { 5950 return; 5951 } 5952 // XXX This is really broken, and probably all needs to be done 5953 // in the window manager, and we need to know more about whether 5954 // we want the area behind or in front of the IME. 5955 final Rect insets = mAttachInfo.mVisibleInsets; 5956 outRect.left += insets.left; 5957 outRect.top += insets.top; 5958 outRect.right -= insets.right; 5959 outRect.bottom -= insets.bottom; 5960 return; 5961 } 5962 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 5963 d.getRectSize(outRect); 5964 } 5965 5966 /** 5967 * Dispatch a notification about a resource configuration change down 5968 * the view hierarchy. 5969 * ViewGroups should override to route to their children. 5970 * 5971 * @param newConfig The new resource configuration. 5972 * 5973 * @see #onConfigurationChanged(android.content.res.Configuration) 5974 */ 5975 public void dispatchConfigurationChanged(Configuration newConfig) { 5976 onConfigurationChanged(newConfig); 5977 } 5978 5979 /** 5980 * Called when the current configuration of the resources being used 5981 * by the application have changed. You can use this to decide when 5982 * to reload resources that can changed based on orientation and other 5983 * configuration characterstics. You only need to use this if you are 5984 * not relying on the normal {@link android.app.Activity} mechanism of 5985 * recreating the activity instance upon a configuration change. 5986 * 5987 * @param newConfig The new resource configuration. 5988 */ 5989 protected void onConfigurationChanged(Configuration newConfig) { 5990 } 5991 5992 /** 5993 * Private function to aggregate all per-view attributes in to the view 5994 * root. 5995 */ 5996 void dispatchCollectViewAttributes(int visibility) { 5997 performCollectViewAttributes(visibility); 5998 } 5999 6000 void performCollectViewAttributes(int visibility) { 6001 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 6002 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 6003 mAttachInfo.mKeepScreenOn = true; 6004 } 6005 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 6006 ListenerInfo li = mListenerInfo; 6007 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 6008 mAttachInfo.mHasSystemUiListeners = true; 6009 } 6010 } 6011 } 6012 6013 void needGlobalAttributesUpdate(boolean force) { 6014 final AttachInfo ai = mAttachInfo; 6015 if (ai != null) { 6016 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 6017 || ai.mHasSystemUiListeners) { 6018 ai.mRecomputeGlobalAttributes = true; 6019 } 6020 } 6021 } 6022 6023 /** 6024 * Returns whether the device is currently in touch mode. Touch mode is entered 6025 * once the user begins interacting with the device by touch, and affects various 6026 * things like whether focus is always visible to the user. 6027 * 6028 * @return Whether the device is in touch mode. 6029 */ 6030 @ViewDebug.ExportedProperty 6031 public boolean isInTouchMode() { 6032 if (mAttachInfo != null) { 6033 return mAttachInfo.mInTouchMode; 6034 } else { 6035 return ViewRootImpl.isInTouchMode(); 6036 } 6037 } 6038 6039 /** 6040 * Returns the context the view is running in, through which it can 6041 * access the current theme, resources, etc. 6042 * 6043 * @return The view's Context. 6044 */ 6045 @ViewDebug.CapturedViewProperty 6046 public final Context getContext() { 6047 return mContext; 6048 } 6049 6050 /** 6051 * Handle a key event before it is processed by any input method 6052 * associated with the view hierarchy. This can be used to intercept 6053 * key events in special situations before the IME consumes them; a 6054 * typical example would be handling the BACK key to update the application's 6055 * UI instead of allowing the IME to see it and close itself. 6056 * 6057 * @param keyCode The value in event.getKeyCode(). 6058 * @param event Description of the key event. 6059 * @return If you handled the event, return true. If you want to allow the 6060 * event to be handled by the next receiver, return false. 6061 */ 6062 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 6063 return false; 6064 } 6065 6066 /** 6067 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 6068 * KeyEvent.Callback.onKeyDown()}: perform press of the view 6069 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 6070 * is released, if the view is enabled and clickable. 6071 * 6072 * @param keyCode A key code that represents the button pressed, from 6073 * {@link android.view.KeyEvent}. 6074 * @param event The KeyEvent object that defines the button action. 6075 */ 6076 public boolean onKeyDown(int keyCode, KeyEvent event) { 6077 boolean result = false; 6078 6079 switch (keyCode) { 6080 case KeyEvent.KEYCODE_DPAD_CENTER: 6081 case KeyEvent.KEYCODE_ENTER: { 6082 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 6083 return true; 6084 } 6085 // Long clickable items don't necessarily have to be clickable 6086 if (((mViewFlags & CLICKABLE) == CLICKABLE || 6087 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 6088 (event.getRepeatCount() == 0)) { 6089 setPressed(true); 6090 checkForLongClick(0); 6091 return true; 6092 } 6093 break; 6094 } 6095 } 6096 return result; 6097 } 6098 6099 /** 6100 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 6101 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 6102 * the event). 6103 */ 6104 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 6105 return false; 6106 } 6107 6108 /** 6109 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 6110 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 6111 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 6112 * {@link KeyEvent#KEYCODE_ENTER} is released. 6113 * 6114 * @param keyCode A key code that represents the button pressed, from 6115 * {@link android.view.KeyEvent}. 6116 * @param event The KeyEvent object that defines the button action. 6117 */ 6118 public boolean onKeyUp(int keyCode, KeyEvent event) { 6119 boolean result = false; 6120 6121 switch (keyCode) { 6122 case KeyEvent.KEYCODE_DPAD_CENTER: 6123 case KeyEvent.KEYCODE_ENTER: { 6124 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 6125 return true; 6126 } 6127 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 6128 setPressed(false); 6129 6130 if (!mHasPerformedLongPress) { 6131 // This is a tap, so remove the longpress check 6132 removeLongPressCallback(); 6133 6134 result = performClick(); 6135 } 6136 } 6137 break; 6138 } 6139 } 6140 return result; 6141 } 6142 6143 /** 6144 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 6145 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 6146 * the event). 6147 * 6148 * @param keyCode A key code that represents the button pressed, from 6149 * {@link android.view.KeyEvent}. 6150 * @param repeatCount The number of times the action was made. 6151 * @param event The KeyEvent object that defines the button action. 6152 */ 6153 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 6154 return false; 6155 } 6156 6157 /** 6158 * Called on the focused view when a key shortcut event is not handled. 6159 * Override this method to implement local key shortcuts for the View. 6160 * Key shortcuts can also be implemented by setting the 6161 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 6162 * 6163 * @param keyCode The value in event.getKeyCode(). 6164 * @param event Description of the key event. 6165 * @return If you handled the event, return true. If you want to allow the 6166 * event to be handled by the next receiver, return false. 6167 */ 6168 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 6169 return false; 6170 } 6171 6172 /** 6173 * Check whether the called view is a text editor, in which case it 6174 * would make sense to automatically display a soft input window for 6175 * it. Subclasses should override this if they implement 6176 * {@link #onCreateInputConnection(EditorInfo)} to return true if 6177 * a call on that method would return a non-null InputConnection, and 6178 * they are really a first-class editor that the user would normally 6179 * start typing on when the go into a window containing your view. 6180 * 6181 * <p>The default implementation always returns false. This does 6182 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 6183 * will not be called or the user can not otherwise perform edits on your 6184 * view; it is just a hint to the system that this is not the primary 6185 * purpose of this view. 6186 * 6187 * @return Returns true if this view is a text editor, else false. 6188 */ 6189 public boolean onCheckIsTextEditor() { 6190 return false; 6191 } 6192 6193 /** 6194 * Create a new InputConnection for an InputMethod to interact 6195 * with the view. The default implementation returns null, since it doesn't 6196 * support input methods. You can override this to implement such support. 6197 * This is only needed for views that take focus and text input. 6198 * 6199 * <p>When implementing this, you probably also want to implement 6200 * {@link #onCheckIsTextEditor()} to indicate you will return a 6201 * non-null InputConnection. 6202 * 6203 * @param outAttrs Fill in with attribute information about the connection. 6204 */ 6205 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 6206 return null; 6207 } 6208 6209 /** 6210 * Called by the {@link android.view.inputmethod.InputMethodManager} 6211 * when a view who is not the current 6212 * input connection target is trying to make a call on the manager. The 6213 * default implementation returns false; you can override this to return 6214 * true for certain views if you are performing InputConnection proxying 6215 * to them. 6216 * @param view The View that is making the InputMethodManager call. 6217 * @return Return true to allow the call, false to reject. 6218 */ 6219 public boolean checkInputConnectionProxy(View view) { 6220 return false; 6221 } 6222 6223 /** 6224 * Show the context menu for this view. It is not safe to hold on to the 6225 * menu after returning from this method. 6226 * 6227 * You should normally not overload this method. Overload 6228 * {@link #onCreateContextMenu(ContextMenu)} or define an 6229 * {@link OnCreateContextMenuListener} to add items to the context menu. 6230 * 6231 * @param menu The context menu to populate 6232 */ 6233 public void createContextMenu(ContextMenu menu) { 6234 ContextMenuInfo menuInfo = getContextMenuInfo(); 6235 6236 // Sets the current menu info so all items added to menu will have 6237 // my extra info set. 6238 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 6239 6240 onCreateContextMenu(menu); 6241 ListenerInfo li = mListenerInfo; 6242 if (li != null && li.mOnCreateContextMenuListener != null) { 6243 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 6244 } 6245 6246 // Clear the extra information so subsequent items that aren't mine don't 6247 // have my extra info. 6248 ((MenuBuilder)menu).setCurrentMenuInfo(null); 6249 6250 if (mParent != null) { 6251 mParent.createContextMenu(menu); 6252 } 6253 } 6254 6255 /** 6256 * Views should implement this if they have extra information to associate 6257 * with the context menu. The return result is supplied as a parameter to 6258 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 6259 * callback. 6260 * 6261 * @return Extra information about the item for which the context menu 6262 * should be shown. This information will vary across different 6263 * subclasses of View. 6264 */ 6265 protected ContextMenuInfo getContextMenuInfo() { 6266 return null; 6267 } 6268 6269 /** 6270 * Views should implement this if the view itself is going to add items to 6271 * the context menu. 6272 * 6273 * @param menu the context menu to populate 6274 */ 6275 protected void onCreateContextMenu(ContextMenu menu) { 6276 } 6277 6278 /** 6279 * Implement this method to handle trackball motion events. The 6280 * <em>relative</em> movement of the trackball since the last event 6281 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 6282 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 6283 * that a movement of 1 corresponds to the user pressing one DPAD key (so 6284 * they will often be fractional values, representing the more fine-grained 6285 * movement information available from a trackball). 6286 * 6287 * @param event The motion event. 6288 * @return True if the event was handled, false otherwise. 6289 */ 6290 public boolean onTrackballEvent(MotionEvent event) { 6291 return false; 6292 } 6293 6294 /** 6295 * Implement this method to handle generic motion events. 6296 * <p> 6297 * Generic motion events describe joystick movements, mouse hovers, track pad 6298 * touches, scroll wheel movements and other input events. The 6299 * {@link MotionEvent#getSource() source} of the motion event specifies 6300 * the class of input that was received. Implementations of this method 6301 * must examine the bits in the source before processing the event. 6302 * The following code example shows how this is done. 6303 * </p><p> 6304 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6305 * are delivered to the view under the pointer. All other generic motion events are 6306 * delivered to the focused view. 6307 * </p> 6308 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 6309 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 6310 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 6311 * // process the joystick movement... 6312 * return true; 6313 * } 6314 * } 6315 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6316 * switch (event.getAction()) { 6317 * case MotionEvent.ACTION_HOVER_MOVE: 6318 * // process the mouse hover movement... 6319 * return true; 6320 * case MotionEvent.ACTION_SCROLL: 6321 * // process the scroll wheel movement... 6322 * return true; 6323 * } 6324 * } 6325 * return super.onGenericMotionEvent(event); 6326 * }</pre> 6327 * 6328 * @param event The generic motion event being processed. 6329 * @return True if the event was handled, false otherwise. 6330 */ 6331 public boolean onGenericMotionEvent(MotionEvent event) { 6332 return false; 6333 } 6334 6335 /** 6336 * Implement this method to handle hover events. 6337 * <p> 6338 * This method is called whenever a pointer is hovering into, over, or out of the 6339 * bounds of a view and the view is not currently being touched. 6340 * Hover events are represented as pointer events with action 6341 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 6342 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 6343 * </p> 6344 * <ul> 6345 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 6346 * when the pointer enters the bounds of the view.</li> 6347 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 6348 * when the pointer has already entered the bounds of the view and has moved.</li> 6349 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 6350 * when the pointer has exited the bounds of the view or when the pointer is 6351 * about to go down due to a button click, tap, or similar user action that 6352 * causes the view to be touched.</li> 6353 * </ul> 6354 * <p> 6355 * The view should implement this method to return true to indicate that it is 6356 * handling the hover event, such as by changing its drawable state. 6357 * </p><p> 6358 * The default implementation calls {@link #setHovered} to update the hovered state 6359 * of the view when a hover enter or hover exit event is received, if the view 6360 * is enabled and is clickable. The default implementation also sends hover 6361 * accessibility events. 6362 * </p> 6363 * 6364 * @param event The motion event that describes the hover. 6365 * @return True if the view handled the hover event. 6366 * 6367 * @see #isHovered 6368 * @see #setHovered 6369 * @see #onHoverChanged 6370 */ 6371 public boolean onHoverEvent(MotionEvent event) { 6372 // The root view may receive hover (or touch) events that are outside the bounds of 6373 // the window. This code ensures that we only send accessibility events for 6374 // hovers that are actually within the bounds of the root view. 6375 final int action = event.getAction(); 6376 if (!mSendingHoverAccessibilityEvents) { 6377 if ((action == MotionEvent.ACTION_HOVER_ENTER 6378 || action == MotionEvent.ACTION_HOVER_MOVE) 6379 && !hasHoveredChild() 6380 && pointInView(event.getX(), event.getY())) { 6381 mSendingHoverAccessibilityEvents = true; 6382 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 6383 } 6384 } else { 6385 if (action == MotionEvent.ACTION_HOVER_EXIT 6386 || (action == MotionEvent.ACTION_HOVER_MOVE 6387 && !pointInView(event.getX(), event.getY()))) { 6388 mSendingHoverAccessibilityEvents = false; 6389 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 6390 } 6391 } 6392 6393 if (isHoverable()) { 6394 switch (action) { 6395 case MotionEvent.ACTION_HOVER_ENTER: 6396 setHovered(true); 6397 break; 6398 case MotionEvent.ACTION_HOVER_EXIT: 6399 setHovered(false); 6400 break; 6401 } 6402 6403 // Dispatch the event to onGenericMotionEvent before returning true. 6404 // This is to provide compatibility with existing applications that 6405 // handled HOVER_MOVE events in onGenericMotionEvent and that would 6406 // break because of the new default handling for hoverable views 6407 // in onHoverEvent. 6408 // Note that onGenericMotionEvent will be called by default when 6409 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 6410 dispatchGenericMotionEventInternal(event); 6411 return true; 6412 } 6413 return false; 6414 } 6415 6416 /** 6417 * Returns true if the view should handle {@link #onHoverEvent} 6418 * by calling {@link #setHovered} to change its hovered state. 6419 * 6420 * @return True if the view is hoverable. 6421 */ 6422 private boolean isHoverable() { 6423 final int viewFlags = mViewFlags; 6424 //noinspection SimplifiableIfStatement 6425 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6426 return false; 6427 } 6428 6429 return (viewFlags & CLICKABLE) == CLICKABLE 6430 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6431 } 6432 6433 /** 6434 * Returns true if the view is currently hovered. 6435 * 6436 * @return True if the view is currently hovered. 6437 * 6438 * @see #setHovered 6439 * @see #onHoverChanged 6440 */ 6441 @ViewDebug.ExportedProperty 6442 public boolean isHovered() { 6443 return (mPrivateFlags & HOVERED) != 0; 6444 } 6445 6446 /** 6447 * Sets whether the view is currently hovered. 6448 * <p> 6449 * Calling this method also changes the drawable state of the view. This 6450 * enables the view to react to hover by using different drawable resources 6451 * to change its appearance. 6452 * </p><p> 6453 * The {@link #onHoverChanged} method is called when the hovered state changes. 6454 * </p> 6455 * 6456 * @param hovered True if the view is hovered. 6457 * 6458 * @see #isHovered 6459 * @see #onHoverChanged 6460 */ 6461 public void setHovered(boolean hovered) { 6462 if (hovered) { 6463 if ((mPrivateFlags & HOVERED) == 0) { 6464 mPrivateFlags |= HOVERED; 6465 refreshDrawableState(); 6466 onHoverChanged(true); 6467 } 6468 } else { 6469 if ((mPrivateFlags & HOVERED) != 0) { 6470 mPrivateFlags &= ~HOVERED; 6471 refreshDrawableState(); 6472 onHoverChanged(false); 6473 } 6474 } 6475 } 6476 6477 /** 6478 * Implement this method to handle hover state changes. 6479 * <p> 6480 * This method is called whenever the hover state changes as a result of a 6481 * call to {@link #setHovered}. 6482 * </p> 6483 * 6484 * @param hovered The current hover state, as returned by {@link #isHovered}. 6485 * 6486 * @see #isHovered 6487 * @see #setHovered 6488 */ 6489 public void onHoverChanged(boolean hovered) { 6490 } 6491 6492 /** 6493 * Implement this method to handle touch screen motion events. 6494 * 6495 * @param event The motion event. 6496 * @return True if the event was handled, false otherwise. 6497 */ 6498 public boolean onTouchEvent(MotionEvent event) { 6499 final int viewFlags = mViewFlags; 6500 6501 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6502 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 6503 mPrivateFlags &= ~PRESSED; 6504 refreshDrawableState(); 6505 } 6506 // A disabled view that is clickable still consumes the touch 6507 // events, it just doesn't respond to them. 6508 return (((viewFlags & CLICKABLE) == CLICKABLE || 6509 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 6510 } 6511 6512 if (mTouchDelegate != null) { 6513 if (mTouchDelegate.onTouchEvent(event)) { 6514 return true; 6515 } 6516 } 6517 6518 if (((viewFlags & CLICKABLE) == CLICKABLE || 6519 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 6520 switch (event.getAction()) { 6521 case MotionEvent.ACTION_UP: 6522 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 6523 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 6524 // take focus if we don't have it already and we should in 6525 // touch mode. 6526 boolean focusTaken = false; 6527 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 6528 focusTaken = requestFocus(); 6529 } 6530 6531 if (prepressed) { 6532 // The button is being released before we actually 6533 // showed it as pressed. Make it show the pressed 6534 // state now (before scheduling the click) to ensure 6535 // the user sees it. 6536 mPrivateFlags |= PRESSED; 6537 refreshDrawableState(); 6538 } 6539 6540 if (!mHasPerformedLongPress) { 6541 // This is a tap, so remove the longpress check 6542 removeLongPressCallback(); 6543 6544 // Only perform take click actions if we were in the pressed state 6545 if (!focusTaken) { 6546 // Use a Runnable and post this rather than calling 6547 // performClick directly. This lets other visual state 6548 // of the view update before click actions start. 6549 if (mPerformClick == null) { 6550 mPerformClick = new PerformClick(); 6551 } 6552 if (!post(mPerformClick)) { 6553 performClick(); 6554 } 6555 } 6556 } 6557 6558 if (mUnsetPressedState == null) { 6559 mUnsetPressedState = new UnsetPressedState(); 6560 } 6561 6562 if (prepressed) { 6563 postDelayed(mUnsetPressedState, 6564 ViewConfiguration.getPressedStateDuration()); 6565 } else if (!post(mUnsetPressedState)) { 6566 // If the post failed, unpress right now 6567 mUnsetPressedState.run(); 6568 } 6569 removeTapCallback(); 6570 } 6571 break; 6572 6573 case MotionEvent.ACTION_DOWN: 6574 mHasPerformedLongPress = false; 6575 6576 if (performButtonActionOnTouchDown(event)) { 6577 break; 6578 } 6579 6580 // Walk up the hierarchy to determine if we're inside a scrolling container. 6581 boolean isInScrollingContainer = isInScrollingContainer(); 6582 6583 // For views inside a scrolling container, delay the pressed feedback for 6584 // a short period in case this is a scroll. 6585 if (isInScrollingContainer) { 6586 mPrivateFlags |= PREPRESSED; 6587 if (mPendingCheckForTap == null) { 6588 mPendingCheckForTap = new CheckForTap(); 6589 } 6590 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 6591 } else { 6592 // Not inside a scrolling container, so show the feedback right away 6593 mPrivateFlags |= PRESSED; 6594 refreshDrawableState(); 6595 checkForLongClick(0); 6596 } 6597 break; 6598 6599 case MotionEvent.ACTION_CANCEL: 6600 mPrivateFlags &= ~PRESSED; 6601 refreshDrawableState(); 6602 removeTapCallback(); 6603 break; 6604 6605 case MotionEvent.ACTION_MOVE: 6606 final int x = (int) event.getX(); 6607 final int y = (int) event.getY(); 6608 6609 // Be lenient about moving outside of buttons 6610 if (!pointInView(x, y, mTouchSlop)) { 6611 // Outside button 6612 removeTapCallback(); 6613 if ((mPrivateFlags & PRESSED) != 0) { 6614 // Remove any future long press/tap checks 6615 removeLongPressCallback(); 6616 6617 // Need to switch from pressed to not pressed 6618 mPrivateFlags &= ~PRESSED; 6619 refreshDrawableState(); 6620 } 6621 } 6622 break; 6623 } 6624 return true; 6625 } 6626 6627 return false; 6628 } 6629 6630 /** 6631 * @hide 6632 */ 6633 public boolean isInScrollingContainer() { 6634 ViewParent p = getParent(); 6635 while (p != null && p instanceof ViewGroup) { 6636 if (((ViewGroup) p).shouldDelayChildPressedState()) { 6637 return true; 6638 } 6639 p = p.getParent(); 6640 } 6641 return false; 6642 } 6643 6644 /** 6645 * Remove the longpress detection timer. 6646 */ 6647 private void removeLongPressCallback() { 6648 if (mPendingCheckForLongPress != null) { 6649 removeCallbacks(mPendingCheckForLongPress); 6650 } 6651 } 6652 6653 /** 6654 * Remove the pending click action 6655 */ 6656 private void removePerformClickCallback() { 6657 if (mPerformClick != null) { 6658 removeCallbacks(mPerformClick); 6659 } 6660 } 6661 6662 /** 6663 * Remove the prepress detection timer. 6664 */ 6665 private void removeUnsetPressCallback() { 6666 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 6667 setPressed(false); 6668 removeCallbacks(mUnsetPressedState); 6669 } 6670 } 6671 6672 /** 6673 * Remove the tap detection timer. 6674 */ 6675 private void removeTapCallback() { 6676 if (mPendingCheckForTap != null) { 6677 mPrivateFlags &= ~PREPRESSED; 6678 removeCallbacks(mPendingCheckForTap); 6679 } 6680 } 6681 6682 /** 6683 * Cancels a pending long press. Your subclass can use this if you 6684 * want the context menu to come up if the user presses and holds 6685 * at the same place, but you don't want it to come up if they press 6686 * and then move around enough to cause scrolling. 6687 */ 6688 public void cancelLongPress() { 6689 removeLongPressCallback(); 6690 6691 /* 6692 * The prepressed state handled by the tap callback is a display 6693 * construct, but the tap callback will post a long press callback 6694 * less its own timeout. Remove it here. 6695 */ 6696 removeTapCallback(); 6697 } 6698 6699 /** 6700 * Remove the pending callback for sending a 6701 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 6702 */ 6703 private void removeSendViewScrolledAccessibilityEventCallback() { 6704 if (mSendViewScrolledAccessibilityEvent != null) { 6705 removeCallbacks(mSendViewScrolledAccessibilityEvent); 6706 } 6707 } 6708 6709 /** 6710 * Sets the TouchDelegate for this View. 6711 */ 6712 public void setTouchDelegate(TouchDelegate delegate) { 6713 mTouchDelegate = delegate; 6714 } 6715 6716 /** 6717 * Gets the TouchDelegate for this View. 6718 */ 6719 public TouchDelegate getTouchDelegate() { 6720 return mTouchDelegate; 6721 } 6722 6723 /** 6724 * Set flags controlling behavior of this view. 6725 * 6726 * @param flags Constant indicating the value which should be set 6727 * @param mask Constant indicating the bit range that should be changed 6728 */ 6729 void setFlags(int flags, int mask) { 6730 int old = mViewFlags; 6731 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 6732 6733 int changed = mViewFlags ^ old; 6734 if (changed == 0) { 6735 return; 6736 } 6737 int privateFlags = mPrivateFlags; 6738 6739 /* Check if the FOCUSABLE bit has changed */ 6740 if (((changed & FOCUSABLE_MASK) != 0) && 6741 ((privateFlags & HAS_BOUNDS) !=0)) { 6742 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 6743 && ((privateFlags & FOCUSED) != 0)) { 6744 /* Give up focus if we are no longer focusable */ 6745 clearFocus(); 6746 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 6747 && ((privateFlags & FOCUSED) == 0)) { 6748 /* 6749 * Tell the view system that we are now available to take focus 6750 * if no one else already has it. 6751 */ 6752 if (mParent != null) mParent.focusableViewAvailable(this); 6753 } 6754 } 6755 6756 if ((flags & VISIBILITY_MASK) == VISIBLE) { 6757 if ((changed & VISIBILITY_MASK) != 0) { 6758 /* 6759 * If this view is becoming visible, invalidate it in case it changed while 6760 * it was not visible. Marking it drawn ensures that the invalidation will 6761 * go through. 6762 */ 6763 mPrivateFlags |= DRAWN; 6764 invalidate(true); 6765 6766 needGlobalAttributesUpdate(true); 6767 6768 // a view becoming visible is worth notifying the parent 6769 // about in case nothing has focus. even if this specific view 6770 // isn't focusable, it may contain something that is, so let 6771 // the root view try to give this focus if nothing else does. 6772 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 6773 mParent.focusableViewAvailable(this); 6774 } 6775 } 6776 } 6777 6778 /* Check if the GONE bit has changed */ 6779 if ((changed & GONE) != 0) { 6780 needGlobalAttributesUpdate(false); 6781 requestLayout(); 6782 6783 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 6784 if (hasFocus()) clearFocus(); 6785 destroyDrawingCache(); 6786 if (mParent instanceof View) { 6787 // GONE views noop invalidation, so invalidate the parent 6788 ((View) mParent).invalidate(true); 6789 } 6790 // Mark the view drawn to ensure that it gets invalidated properly the next 6791 // time it is visible and gets invalidated 6792 mPrivateFlags |= DRAWN; 6793 } 6794 if (mAttachInfo != null) { 6795 mAttachInfo.mViewVisibilityChanged = true; 6796 } 6797 } 6798 6799 /* Check if the VISIBLE bit has changed */ 6800 if ((changed & INVISIBLE) != 0) { 6801 needGlobalAttributesUpdate(false); 6802 /* 6803 * If this view is becoming invisible, set the DRAWN flag so that 6804 * the next invalidate() will not be skipped. 6805 */ 6806 mPrivateFlags |= DRAWN; 6807 6808 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 6809 // root view becoming invisible shouldn't clear focus 6810 if (getRootView() != this) { 6811 clearFocus(); 6812 } 6813 } 6814 if (mAttachInfo != null) { 6815 mAttachInfo.mViewVisibilityChanged = true; 6816 } 6817 } 6818 6819 if ((changed & VISIBILITY_MASK) != 0) { 6820 if (mParent instanceof ViewGroup) { 6821 ((ViewGroup) mParent).onChildVisibilityChanged(this, (changed & VISIBILITY_MASK), 6822 (flags & VISIBILITY_MASK)); 6823 ((View) mParent).invalidate(true); 6824 } else if (mParent != null) { 6825 mParent.invalidateChild(this, null); 6826 } 6827 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6828 } 6829 6830 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 6831 destroyDrawingCache(); 6832 } 6833 6834 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 6835 destroyDrawingCache(); 6836 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6837 invalidateParentCaches(); 6838 } 6839 6840 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 6841 destroyDrawingCache(); 6842 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6843 } 6844 6845 if ((changed & DRAW_MASK) != 0) { 6846 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 6847 if (mBGDrawable != null) { 6848 mPrivateFlags &= ~SKIP_DRAW; 6849 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 6850 } else { 6851 mPrivateFlags |= SKIP_DRAW; 6852 } 6853 } else { 6854 mPrivateFlags &= ~SKIP_DRAW; 6855 } 6856 requestLayout(); 6857 invalidate(true); 6858 } 6859 6860 if ((changed & KEEP_SCREEN_ON) != 0) { 6861 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 6862 mParent.recomputeViewAttributes(this); 6863 } 6864 } 6865 6866 if ((changed & LAYOUT_DIRECTION_MASK) != 0) { 6867 requestLayout(); 6868 } 6869 } 6870 6871 /** 6872 * Change the view's z order in the tree, so it's on top of other sibling 6873 * views 6874 */ 6875 public void bringToFront() { 6876 if (mParent != null) { 6877 mParent.bringChildToFront(this); 6878 } 6879 } 6880 6881 /** 6882 * This is called in response to an internal scroll in this view (i.e., the 6883 * view scrolled its own contents). This is typically as a result of 6884 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 6885 * called. 6886 * 6887 * @param l Current horizontal scroll origin. 6888 * @param t Current vertical scroll origin. 6889 * @param oldl Previous horizontal scroll origin. 6890 * @param oldt Previous vertical scroll origin. 6891 */ 6892 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 6893 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 6894 postSendViewScrolledAccessibilityEventCallback(); 6895 } 6896 6897 mBackgroundSizeChanged = true; 6898 6899 final AttachInfo ai = mAttachInfo; 6900 if (ai != null) { 6901 ai.mViewScrollChanged = true; 6902 } 6903 } 6904 6905 /** 6906 * Interface definition for a callback to be invoked when the layout bounds of a view 6907 * changes due to layout processing. 6908 */ 6909 public interface OnLayoutChangeListener { 6910 /** 6911 * Called when the focus state of a view has changed. 6912 * 6913 * @param v The view whose state has changed. 6914 * @param left The new value of the view's left property. 6915 * @param top The new value of the view's top property. 6916 * @param right The new value of the view's right property. 6917 * @param bottom The new value of the view's bottom property. 6918 * @param oldLeft The previous value of the view's left property. 6919 * @param oldTop The previous value of the view's top property. 6920 * @param oldRight The previous value of the view's right property. 6921 * @param oldBottom The previous value of the view's bottom property. 6922 */ 6923 void onLayoutChange(View v, int left, int top, int right, int bottom, 6924 int oldLeft, int oldTop, int oldRight, int oldBottom); 6925 } 6926 6927 /** 6928 * This is called during layout when the size of this view has changed. If 6929 * you were just added to the view hierarchy, you're called with the old 6930 * values of 0. 6931 * 6932 * @param w Current width of this view. 6933 * @param h Current height of this view. 6934 * @param oldw Old width of this view. 6935 * @param oldh Old height of this view. 6936 */ 6937 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 6938 } 6939 6940 /** 6941 * Called by draw to draw the child views. This may be overridden 6942 * by derived classes to gain control just before its children are drawn 6943 * (but after its own view has been drawn). 6944 * @param canvas the canvas on which to draw the view 6945 */ 6946 protected void dispatchDraw(Canvas canvas) { 6947 } 6948 6949 /** 6950 * Gets the parent of this view. Note that the parent is a 6951 * ViewParent and not necessarily a View. 6952 * 6953 * @return Parent of this view. 6954 */ 6955 public final ViewParent getParent() { 6956 return mParent; 6957 } 6958 6959 /** 6960 * Set the horizontal scrolled position of your view. This will cause a call to 6961 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6962 * invalidated. 6963 * @param value the x position to scroll to 6964 */ 6965 public void setScrollX(int value) { 6966 scrollTo(value, mScrollY); 6967 } 6968 6969 /** 6970 * Set the vertical scrolled position of your view. This will cause a call to 6971 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6972 * invalidated. 6973 * @param value the y position to scroll to 6974 */ 6975 public void setScrollY(int value) { 6976 scrollTo(mScrollX, value); 6977 } 6978 6979 /** 6980 * Return the scrolled left position of this view. This is the left edge of 6981 * the displayed part of your view. You do not need to draw any pixels 6982 * farther left, since those are outside of the frame of your view on 6983 * screen. 6984 * 6985 * @return The left edge of the displayed part of your view, in pixels. 6986 */ 6987 public final int getScrollX() { 6988 return mScrollX; 6989 } 6990 6991 /** 6992 * Return the scrolled top position of this view. This is the top edge of 6993 * the displayed part of your view. You do not need to draw any pixels above 6994 * it, since those are outside of the frame of your view on screen. 6995 * 6996 * @return The top edge of the displayed part of your view, in pixels. 6997 */ 6998 public final int getScrollY() { 6999 return mScrollY; 7000 } 7001 7002 /** 7003 * Return the width of the your view. 7004 * 7005 * @return The width of your view, in pixels. 7006 */ 7007 @ViewDebug.ExportedProperty(category = "layout") 7008 public final int getWidth() { 7009 return mRight - mLeft; 7010 } 7011 7012 /** 7013 * Return the height of your view. 7014 * 7015 * @return The height of your view, in pixels. 7016 */ 7017 @ViewDebug.ExportedProperty(category = "layout") 7018 public final int getHeight() { 7019 return mBottom - mTop; 7020 } 7021 7022 /** 7023 * Return the visible drawing bounds of your view. Fills in the output 7024 * rectangle with the values from getScrollX(), getScrollY(), 7025 * getWidth(), and getHeight(). 7026 * 7027 * @param outRect The (scrolled) drawing bounds of the view. 7028 */ 7029 public void getDrawingRect(Rect outRect) { 7030 outRect.left = mScrollX; 7031 outRect.top = mScrollY; 7032 outRect.right = mScrollX + (mRight - mLeft); 7033 outRect.bottom = mScrollY + (mBottom - mTop); 7034 } 7035 7036 /** 7037 * Like {@link #getMeasuredWidthAndState()}, but only returns the 7038 * raw width component (that is the result is masked by 7039 * {@link #MEASURED_SIZE_MASK}). 7040 * 7041 * @return The raw measured width of this view. 7042 */ 7043 public final int getMeasuredWidth() { 7044 return mMeasuredWidth & MEASURED_SIZE_MASK; 7045 } 7046 7047 /** 7048 * Return the full width measurement information for this view as computed 7049 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 7050 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 7051 * This should be used during measurement and layout calculations only. Use 7052 * {@link #getWidth()} to see how wide a view is after layout. 7053 * 7054 * @return The measured width of this view as a bit mask. 7055 */ 7056 public final int getMeasuredWidthAndState() { 7057 return mMeasuredWidth; 7058 } 7059 7060 /** 7061 * Like {@link #getMeasuredHeightAndState()}, but only returns the 7062 * raw width component (that is the result is masked by 7063 * {@link #MEASURED_SIZE_MASK}). 7064 * 7065 * @return The raw measured height of this view. 7066 */ 7067 public final int getMeasuredHeight() { 7068 return mMeasuredHeight & MEASURED_SIZE_MASK; 7069 } 7070 7071 /** 7072 * Return the full height measurement information for this view as computed 7073 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 7074 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 7075 * This should be used during measurement and layout calculations only. Use 7076 * {@link #getHeight()} to see how wide a view is after layout. 7077 * 7078 * @return The measured width of this view as a bit mask. 7079 */ 7080 public final int getMeasuredHeightAndState() { 7081 return mMeasuredHeight; 7082 } 7083 7084 /** 7085 * Return only the state bits of {@link #getMeasuredWidthAndState()} 7086 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 7087 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 7088 * and the height component is at the shifted bits 7089 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 7090 */ 7091 public final int getMeasuredState() { 7092 return (mMeasuredWidth&MEASURED_STATE_MASK) 7093 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 7094 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 7095 } 7096 7097 /** 7098 * The transform matrix of this view, which is calculated based on the current 7099 * roation, scale, and pivot properties. 7100 * 7101 * @see #getRotation() 7102 * @see #getScaleX() 7103 * @see #getScaleY() 7104 * @see #getPivotX() 7105 * @see #getPivotY() 7106 * @return The current transform matrix for the view 7107 */ 7108 public Matrix getMatrix() { 7109 if (mTransformationInfo != null) { 7110 updateMatrix(); 7111 return mTransformationInfo.mMatrix; 7112 } 7113 return Matrix.IDENTITY_MATRIX; 7114 } 7115 7116 /** 7117 * Utility function to determine if the value is far enough away from zero to be 7118 * considered non-zero. 7119 * @param value A floating point value to check for zero-ness 7120 * @return whether the passed-in value is far enough away from zero to be considered non-zero 7121 */ 7122 private static boolean nonzero(float value) { 7123 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 7124 } 7125 7126 /** 7127 * Returns true if the transform matrix is the identity matrix. 7128 * Recomputes the matrix if necessary. 7129 * 7130 * @return True if the transform matrix is the identity matrix, false otherwise. 7131 */ 7132 final boolean hasIdentityMatrix() { 7133 if (mTransformationInfo != null) { 7134 updateMatrix(); 7135 return mTransformationInfo.mMatrixIsIdentity; 7136 } 7137 return true; 7138 } 7139 7140 void ensureTransformationInfo() { 7141 if (mTransformationInfo == null) { 7142 mTransformationInfo = new TransformationInfo(); 7143 } 7144 } 7145 7146 /** 7147 * Recomputes the transform matrix if necessary. 7148 */ 7149 private void updateMatrix() { 7150 final TransformationInfo info = mTransformationInfo; 7151 if (info == null) { 7152 return; 7153 } 7154 if (info.mMatrixDirty) { 7155 // transform-related properties have changed since the last time someone 7156 // asked for the matrix; recalculate it with the current values 7157 7158 // Figure out if we need to update the pivot point 7159 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7160 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 7161 info.mPrevWidth = mRight - mLeft; 7162 info.mPrevHeight = mBottom - mTop; 7163 info.mPivotX = info.mPrevWidth / 2f; 7164 info.mPivotY = info.mPrevHeight / 2f; 7165 } 7166 } 7167 info.mMatrix.reset(); 7168 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 7169 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 7170 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 7171 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 7172 } else { 7173 if (info.mCamera == null) { 7174 info.mCamera = new Camera(); 7175 info.matrix3D = new Matrix(); 7176 } 7177 info.mCamera.save(); 7178 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 7179 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 7180 info.mCamera.getMatrix(info.matrix3D); 7181 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 7182 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 7183 info.mPivotY + info.mTranslationY); 7184 info.mMatrix.postConcat(info.matrix3D); 7185 info.mCamera.restore(); 7186 } 7187 info.mMatrixDirty = false; 7188 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 7189 info.mInverseMatrixDirty = true; 7190 } 7191 } 7192 7193 /** 7194 * Utility method to retrieve the inverse of the current mMatrix property. 7195 * We cache the matrix to avoid recalculating it when transform properties 7196 * have not changed. 7197 * 7198 * @return The inverse of the current matrix of this view. 7199 */ 7200 final Matrix getInverseMatrix() { 7201 final TransformationInfo info = mTransformationInfo; 7202 if (info != null) { 7203 updateMatrix(); 7204 if (info.mInverseMatrixDirty) { 7205 if (info.mInverseMatrix == null) { 7206 info.mInverseMatrix = new Matrix(); 7207 } 7208 info.mMatrix.invert(info.mInverseMatrix); 7209 info.mInverseMatrixDirty = false; 7210 } 7211 return info.mInverseMatrix; 7212 } 7213 return Matrix.IDENTITY_MATRIX; 7214 } 7215 7216 /** 7217 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 7218 * views are drawn) from the camera to this view. The camera's distance 7219 * affects 3D transformations, for instance rotations around the X and Y 7220 * axis. If the rotationX or rotationY properties are changed and this view is 7221 * large (more than half the size of the screen), it is recommended to always 7222 * use a camera distance that's greater than the height (X axis rotation) or 7223 * the width (Y axis rotation) of this view.</p> 7224 * 7225 * <p>The distance of the camera from the view plane can have an affect on the 7226 * perspective distortion of the view when it is rotated around the x or y axis. 7227 * For example, a large distance will result in a large viewing angle, and there 7228 * will not be much perspective distortion of the view as it rotates. A short 7229 * distance may cause much more perspective distortion upon rotation, and can 7230 * also result in some drawing artifacts if the rotated view ends up partially 7231 * behind the camera (which is why the recommendation is to use a distance at 7232 * least as far as the size of the view, if the view is to be rotated.)</p> 7233 * 7234 * <p>The distance is expressed in "depth pixels." The default distance depends 7235 * on the screen density. For instance, on a medium density display, the 7236 * default distance is 1280. On a high density display, the default distance 7237 * is 1920.</p> 7238 * 7239 * <p>If you want to specify a distance that leads to visually consistent 7240 * results across various densities, use the following formula:</p> 7241 * <pre> 7242 * float scale = context.getResources().getDisplayMetrics().density; 7243 * view.setCameraDistance(distance * scale); 7244 * </pre> 7245 * 7246 * <p>The density scale factor of a high density display is 1.5, 7247 * and 1920 = 1280 * 1.5.</p> 7248 * 7249 * @param distance The distance in "depth pixels", if negative the opposite 7250 * value is used 7251 * 7252 * @see #setRotationX(float) 7253 * @see #setRotationY(float) 7254 */ 7255 public void setCameraDistance(float distance) { 7256 invalidateParentCaches(); 7257 invalidate(false); 7258 7259 ensureTransformationInfo(); 7260 final float dpi = mResources.getDisplayMetrics().densityDpi; 7261 final TransformationInfo info = mTransformationInfo; 7262 if (info.mCamera == null) { 7263 info.mCamera = new Camera(); 7264 info.matrix3D = new Matrix(); 7265 } 7266 7267 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 7268 info.mMatrixDirty = true; 7269 7270 invalidate(false); 7271 } 7272 7273 /** 7274 * The degrees that the view is rotated around the pivot point. 7275 * 7276 * @see #setRotation(float) 7277 * @see #getPivotX() 7278 * @see #getPivotY() 7279 * 7280 * @return The degrees of rotation. 7281 */ 7282 @ViewDebug.ExportedProperty(category = "drawing") 7283 public float getRotation() { 7284 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 7285 } 7286 7287 /** 7288 * Sets the degrees that the view is rotated around the pivot point. Increasing values 7289 * result in clockwise rotation. 7290 * 7291 * @param rotation The degrees of rotation. 7292 * 7293 * @see #getRotation() 7294 * @see #getPivotX() 7295 * @see #getPivotY() 7296 * @see #setRotationX(float) 7297 * @see #setRotationY(float) 7298 * 7299 * @attr ref android.R.styleable#View_rotation 7300 */ 7301 public void setRotation(float rotation) { 7302 ensureTransformationInfo(); 7303 final TransformationInfo info = mTransformationInfo; 7304 if (info.mRotation != rotation) { 7305 invalidateParentCaches(); 7306 // Double-invalidation is necessary to capture view's old and new areas 7307 invalidate(false); 7308 info.mRotation = rotation; 7309 info.mMatrixDirty = true; 7310 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7311 invalidate(false); 7312 } 7313 } 7314 7315 /** 7316 * The degrees that the view is rotated around the vertical axis through the pivot point. 7317 * 7318 * @see #getPivotX() 7319 * @see #getPivotY() 7320 * @see #setRotationY(float) 7321 * 7322 * @return The degrees of Y rotation. 7323 */ 7324 @ViewDebug.ExportedProperty(category = "drawing") 7325 public float getRotationY() { 7326 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 7327 } 7328 7329 /** 7330 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 7331 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 7332 * down the y axis. 7333 * 7334 * When rotating large views, it is recommended to adjust the camera distance 7335 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7336 * 7337 * @param rotationY The degrees of Y rotation. 7338 * 7339 * @see #getRotationY() 7340 * @see #getPivotX() 7341 * @see #getPivotY() 7342 * @see #setRotation(float) 7343 * @see #setRotationX(float) 7344 * @see #setCameraDistance(float) 7345 * 7346 * @attr ref android.R.styleable#View_rotationY 7347 */ 7348 public void setRotationY(float rotationY) { 7349 ensureTransformationInfo(); 7350 final TransformationInfo info = mTransformationInfo; 7351 if (info.mRotationY != rotationY) { 7352 invalidateParentCaches(); 7353 // Double-invalidation is necessary to capture view's old and new areas 7354 invalidate(false); 7355 info.mRotationY = rotationY; 7356 info.mMatrixDirty = true; 7357 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7358 invalidate(false); 7359 } 7360 } 7361 7362 /** 7363 * The degrees that the view is rotated around the horizontal axis through the pivot point. 7364 * 7365 * @see #getPivotX() 7366 * @see #getPivotY() 7367 * @see #setRotationX(float) 7368 * 7369 * @return The degrees of X rotation. 7370 */ 7371 @ViewDebug.ExportedProperty(category = "drawing") 7372 public float getRotationX() { 7373 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 7374 } 7375 7376 /** 7377 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 7378 * Increasing values result in clockwise rotation from the viewpoint of looking down the 7379 * x axis. 7380 * 7381 * When rotating large views, it is recommended to adjust the camera distance 7382 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7383 * 7384 * @param rotationX The degrees of X rotation. 7385 * 7386 * @see #getRotationX() 7387 * @see #getPivotX() 7388 * @see #getPivotY() 7389 * @see #setRotation(float) 7390 * @see #setRotationY(float) 7391 * @see #setCameraDistance(float) 7392 * 7393 * @attr ref android.R.styleable#View_rotationX 7394 */ 7395 public void setRotationX(float rotationX) { 7396 ensureTransformationInfo(); 7397 final TransformationInfo info = mTransformationInfo; 7398 if (info.mRotationX != rotationX) { 7399 invalidateParentCaches(); 7400 // Double-invalidation is necessary to capture view's old and new areas 7401 invalidate(false); 7402 info.mRotationX = rotationX; 7403 info.mMatrixDirty = true; 7404 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7405 invalidate(false); 7406 } 7407 } 7408 7409 /** 7410 * The amount that the view is scaled in x around the pivot point, as a proportion of 7411 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 7412 * 7413 * <p>By default, this is 1.0f. 7414 * 7415 * @see #getPivotX() 7416 * @see #getPivotY() 7417 * @return The scaling factor. 7418 */ 7419 @ViewDebug.ExportedProperty(category = "drawing") 7420 public float getScaleX() { 7421 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 7422 } 7423 7424 /** 7425 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 7426 * the view's unscaled width. A value of 1 means that no scaling is applied. 7427 * 7428 * @param scaleX The scaling factor. 7429 * @see #getPivotX() 7430 * @see #getPivotY() 7431 * 7432 * @attr ref android.R.styleable#View_scaleX 7433 */ 7434 public void setScaleX(float scaleX) { 7435 ensureTransformationInfo(); 7436 final TransformationInfo info = mTransformationInfo; 7437 if (info.mScaleX != scaleX) { 7438 invalidateParentCaches(); 7439 // Double-invalidation is necessary to capture view's old and new areas 7440 invalidate(false); 7441 info.mScaleX = scaleX; 7442 info.mMatrixDirty = true; 7443 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7444 invalidate(false); 7445 } 7446 } 7447 7448 /** 7449 * The amount that the view is scaled in y around the pivot point, as a proportion of 7450 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 7451 * 7452 * <p>By default, this is 1.0f. 7453 * 7454 * @see #getPivotX() 7455 * @see #getPivotY() 7456 * @return The scaling factor. 7457 */ 7458 @ViewDebug.ExportedProperty(category = "drawing") 7459 public float getScaleY() { 7460 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 7461 } 7462 7463 /** 7464 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 7465 * the view's unscaled width. A value of 1 means that no scaling is applied. 7466 * 7467 * @param scaleY The scaling factor. 7468 * @see #getPivotX() 7469 * @see #getPivotY() 7470 * 7471 * @attr ref android.R.styleable#View_scaleY 7472 */ 7473 public void setScaleY(float scaleY) { 7474 ensureTransformationInfo(); 7475 final TransformationInfo info = mTransformationInfo; 7476 if (info.mScaleY != scaleY) { 7477 invalidateParentCaches(); 7478 // Double-invalidation is necessary to capture view's old and new areas 7479 invalidate(false); 7480 info.mScaleY = scaleY; 7481 info.mMatrixDirty = true; 7482 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7483 invalidate(false); 7484 } 7485 } 7486 7487 /** 7488 * The x location of the point around which the view is {@link #setRotation(float) rotated} 7489 * and {@link #setScaleX(float) scaled}. 7490 * 7491 * @see #getRotation() 7492 * @see #getScaleX() 7493 * @see #getScaleY() 7494 * @see #getPivotY() 7495 * @return The x location of the pivot point. 7496 */ 7497 @ViewDebug.ExportedProperty(category = "drawing") 7498 public float getPivotX() { 7499 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 7500 } 7501 7502 /** 7503 * Sets the x location of the point around which the view is 7504 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 7505 * By default, the pivot point is centered on the object. 7506 * Setting this property disables this behavior and causes the view to use only the 7507 * explicitly set pivotX and pivotY values. 7508 * 7509 * @param pivotX The x location of the pivot point. 7510 * @see #getRotation() 7511 * @see #getScaleX() 7512 * @see #getScaleY() 7513 * @see #getPivotY() 7514 * 7515 * @attr ref android.R.styleable#View_transformPivotX 7516 */ 7517 public void setPivotX(float pivotX) { 7518 ensureTransformationInfo(); 7519 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7520 final TransformationInfo info = mTransformationInfo; 7521 if (info.mPivotX != pivotX) { 7522 invalidateParentCaches(); 7523 // Double-invalidation is necessary to capture view's old and new areas 7524 invalidate(false); 7525 info.mPivotX = pivotX; 7526 info.mMatrixDirty = true; 7527 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7528 invalidate(false); 7529 } 7530 } 7531 7532 /** 7533 * The y location of the point around which the view is {@link #setRotation(float) rotated} 7534 * and {@link #setScaleY(float) scaled}. 7535 * 7536 * @see #getRotation() 7537 * @see #getScaleX() 7538 * @see #getScaleY() 7539 * @see #getPivotY() 7540 * @return The y location of the pivot point. 7541 */ 7542 @ViewDebug.ExportedProperty(category = "drawing") 7543 public float getPivotY() { 7544 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 7545 } 7546 7547 /** 7548 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 7549 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 7550 * Setting this property disables this behavior and causes the view to use only the 7551 * explicitly set pivotX and pivotY values. 7552 * 7553 * @param pivotY The y location of the pivot point. 7554 * @see #getRotation() 7555 * @see #getScaleX() 7556 * @see #getScaleY() 7557 * @see #getPivotY() 7558 * 7559 * @attr ref android.R.styleable#View_transformPivotY 7560 */ 7561 public void setPivotY(float pivotY) { 7562 ensureTransformationInfo(); 7563 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7564 final TransformationInfo info = mTransformationInfo; 7565 if (info.mPivotY != pivotY) { 7566 invalidateParentCaches(); 7567 // Double-invalidation is necessary to capture view's old and new areas 7568 invalidate(false); 7569 info.mPivotY = pivotY; 7570 info.mMatrixDirty = true; 7571 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7572 invalidate(false); 7573 } 7574 } 7575 7576 /** 7577 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 7578 * completely transparent and 1 means the view is completely opaque. 7579 * 7580 * <p>By default this is 1.0f. 7581 * @return The opacity of the view. 7582 */ 7583 @ViewDebug.ExportedProperty(category = "drawing") 7584 public float getAlpha() { 7585 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 7586 } 7587 7588 /** 7589 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 7590 * completely transparent and 1 means the view is completely opaque.</p> 7591 * 7592 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 7593 * responsible for applying the opacity itself. Otherwise, calling this method is 7594 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 7595 * setting a hardware layer.</p> 7596 * 7597 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 7598 * performance implications. It is generally best to use the alpha property sparingly and 7599 * transiently, as in the case of fading animations.</p> 7600 * 7601 * @param alpha The opacity of the view. 7602 * 7603 * @see #setLayerType(int, android.graphics.Paint) 7604 * 7605 * @attr ref android.R.styleable#View_alpha 7606 */ 7607 public void setAlpha(float alpha) { 7608 ensureTransformationInfo(); 7609 if (mTransformationInfo.mAlpha != alpha) { 7610 mTransformationInfo.mAlpha = alpha; 7611 invalidateParentCaches(); 7612 if (onSetAlpha((int) (alpha * 255))) { 7613 mPrivateFlags |= ALPHA_SET; 7614 // subclass is handling alpha - don't optimize rendering cache invalidation 7615 invalidate(true); 7616 } else { 7617 mPrivateFlags &= ~ALPHA_SET; 7618 invalidate(false); 7619 } 7620 } 7621 } 7622 7623 /** 7624 * Faster version of setAlpha() which performs the same steps except there are 7625 * no calls to invalidate(). The caller of this function should perform proper invalidation 7626 * on the parent and this object. The return value indicates whether the subclass handles 7627 * alpha (the return value for onSetAlpha()). 7628 * 7629 * @param alpha The new value for the alpha property 7630 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 7631 * the new value for the alpha property is different from the old value 7632 */ 7633 boolean setAlphaNoInvalidation(float alpha) { 7634 ensureTransformationInfo(); 7635 if (mTransformationInfo.mAlpha != alpha) { 7636 mTransformationInfo.mAlpha = alpha; 7637 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 7638 if (subclassHandlesAlpha) { 7639 mPrivateFlags |= ALPHA_SET; 7640 return true; 7641 } else { 7642 mPrivateFlags &= ~ALPHA_SET; 7643 } 7644 } 7645 return false; 7646 } 7647 7648 /** 7649 * Top position of this view relative to its parent. 7650 * 7651 * @return The top of this view, in pixels. 7652 */ 7653 @ViewDebug.CapturedViewProperty 7654 public final int getTop() { 7655 return mTop; 7656 } 7657 7658 /** 7659 * Sets the top position of this view relative to its parent. This method is meant to be called 7660 * by the layout system and should not generally be called otherwise, because the property 7661 * may be changed at any time by the layout. 7662 * 7663 * @param top The top of this view, in pixels. 7664 */ 7665 public final void setTop(int top) { 7666 if (top != mTop) { 7667 updateMatrix(); 7668 final boolean matrixIsIdentity = mTransformationInfo == null 7669 || mTransformationInfo.mMatrixIsIdentity; 7670 if (matrixIsIdentity) { 7671 if (mAttachInfo != null) { 7672 int minTop; 7673 int yLoc; 7674 if (top < mTop) { 7675 minTop = top; 7676 yLoc = top - mTop; 7677 } else { 7678 minTop = mTop; 7679 yLoc = 0; 7680 } 7681 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 7682 } 7683 } else { 7684 // Double-invalidation is necessary to capture view's old and new areas 7685 invalidate(true); 7686 } 7687 7688 int width = mRight - mLeft; 7689 int oldHeight = mBottom - mTop; 7690 7691 mTop = top; 7692 7693 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7694 7695 if (!matrixIsIdentity) { 7696 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7697 // A change in dimension means an auto-centered pivot point changes, too 7698 mTransformationInfo.mMatrixDirty = true; 7699 } 7700 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7701 invalidate(true); 7702 } 7703 mBackgroundSizeChanged = true; 7704 invalidateParentIfNeeded(); 7705 } 7706 } 7707 7708 /** 7709 * Bottom position of this view relative to its parent. 7710 * 7711 * @return The bottom of this view, in pixels. 7712 */ 7713 @ViewDebug.CapturedViewProperty 7714 public final int getBottom() { 7715 return mBottom; 7716 } 7717 7718 /** 7719 * True if this view has changed since the last time being drawn. 7720 * 7721 * @return The dirty state of this view. 7722 */ 7723 public boolean isDirty() { 7724 return (mPrivateFlags & DIRTY_MASK) != 0; 7725 } 7726 7727 /** 7728 * Sets the bottom position of this view relative to its parent. This method is meant to be 7729 * called by the layout system and should not generally be called otherwise, because the 7730 * property may be changed at any time by the layout. 7731 * 7732 * @param bottom The bottom of this view, in pixels. 7733 */ 7734 public final void setBottom(int bottom) { 7735 if (bottom != mBottom) { 7736 updateMatrix(); 7737 final boolean matrixIsIdentity = mTransformationInfo == null 7738 || mTransformationInfo.mMatrixIsIdentity; 7739 if (matrixIsIdentity) { 7740 if (mAttachInfo != null) { 7741 int maxBottom; 7742 if (bottom < mBottom) { 7743 maxBottom = mBottom; 7744 } else { 7745 maxBottom = bottom; 7746 } 7747 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 7748 } 7749 } else { 7750 // Double-invalidation is necessary to capture view's old and new areas 7751 invalidate(true); 7752 } 7753 7754 int width = mRight - mLeft; 7755 int oldHeight = mBottom - mTop; 7756 7757 mBottom = bottom; 7758 7759 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7760 7761 if (!matrixIsIdentity) { 7762 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7763 // A change in dimension means an auto-centered pivot point changes, too 7764 mTransformationInfo.mMatrixDirty = true; 7765 } 7766 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7767 invalidate(true); 7768 } 7769 mBackgroundSizeChanged = true; 7770 invalidateParentIfNeeded(); 7771 } 7772 } 7773 7774 /** 7775 * Left position of this view relative to its parent. 7776 * 7777 * @return The left edge of this view, in pixels. 7778 */ 7779 @ViewDebug.CapturedViewProperty 7780 public final int getLeft() { 7781 return mLeft; 7782 } 7783 7784 /** 7785 * Sets the left position of this view relative to its parent. This method is meant to be called 7786 * by the layout system and should not generally be called otherwise, because the property 7787 * may be changed at any time by the layout. 7788 * 7789 * @param left The bottom of this view, in pixels. 7790 */ 7791 public final void setLeft(int left) { 7792 if (left != mLeft) { 7793 updateMatrix(); 7794 final boolean matrixIsIdentity = mTransformationInfo == null 7795 || mTransformationInfo.mMatrixIsIdentity; 7796 if (matrixIsIdentity) { 7797 if (mAttachInfo != null) { 7798 int minLeft; 7799 int xLoc; 7800 if (left < mLeft) { 7801 minLeft = left; 7802 xLoc = left - mLeft; 7803 } else { 7804 minLeft = mLeft; 7805 xLoc = 0; 7806 } 7807 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 7808 } 7809 } else { 7810 // Double-invalidation is necessary to capture view's old and new areas 7811 invalidate(true); 7812 } 7813 7814 int oldWidth = mRight - mLeft; 7815 int height = mBottom - mTop; 7816 7817 mLeft = left; 7818 7819 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7820 7821 if (!matrixIsIdentity) { 7822 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7823 // A change in dimension means an auto-centered pivot point changes, too 7824 mTransformationInfo.mMatrixDirty = true; 7825 } 7826 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7827 invalidate(true); 7828 } 7829 mBackgroundSizeChanged = true; 7830 invalidateParentIfNeeded(); 7831 } 7832 } 7833 7834 /** 7835 * Right position of this view relative to its parent. 7836 * 7837 * @return The right edge of this view, in pixels. 7838 */ 7839 @ViewDebug.CapturedViewProperty 7840 public final int getRight() { 7841 return mRight; 7842 } 7843 7844 /** 7845 * Sets the right position of this view relative to its parent. This method is meant to be called 7846 * by the layout system and should not generally be called otherwise, because the property 7847 * may be changed at any time by the layout. 7848 * 7849 * @param right The bottom of this view, in pixels. 7850 */ 7851 public final void setRight(int right) { 7852 if (right != mRight) { 7853 updateMatrix(); 7854 final boolean matrixIsIdentity = mTransformationInfo == null 7855 || mTransformationInfo.mMatrixIsIdentity; 7856 if (matrixIsIdentity) { 7857 if (mAttachInfo != null) { 7858 int maxRight; 7859 if (right < mRight) { 7860 maxRight = mRight; 7861 } else { 7862 maxRight = right; 7863 } 7864 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 7865 } 7866 } else { 7867 // Double-invalidation is necessary to capture view's old and new areas 7868 invalidate(true); 7869 } 7870 7871 int oldWidth = mRight - mLeft; 7872 int height = mBottom - mTop; 7873 7874 mRight = right; 7875 7876 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7877 7878 if (!matrixIsIdentity) { 7879 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7880 // A change in dimension means an auto-centered pivot point changes, too 7881 mTransformationInfo.mMatrixDirty = true; 7882 } 7883 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7884 invalidate(true); 7885 } 7886 mBackgroundSizeChanged = true; 7887 invalidateParentIfNeeded(); 7888 } 7889 } 7890 7891 /** 7892 * The visual x position of this view, in pixels. This is equivalent to the 7893 * {@link #setTranslationX(float) translationX} property plus the current 7894 * {@link #getLeft() left} property. 7895 * 7896 * @return The visual x position of this view, in pixels. 7897 */ 7898 @ViewDebug.ExportedProperty(category = "drawing") 7899 public float getX() { 7900 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 7901 } 7902 7903 /** 7904 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 7905 * {@link #setTranslationX(float) translationX} property to be the difference between 7906 * the x value passed in and the current {@link #getLeft() left} property. 7907 * 7908 * @param x The visual x position of this view, in pixels. 7909 */ 7910 public void setX(float x) { 7911 setTranslationX(x - mLeft); 7912 } 7913 7914 /** 7915 * The visual y position of this view, in pixels. This is equivalent to the 7916 * {@link #setTranslationY(float) translationY} property plus the current 7917 * {@link #getTop() top} property. 7918 * 7919 * @return The visual y position of this view, in pixels. 7920 */ 7921 @ViewDebug.ExportedProperty(category = "drawing") 7922 public float getY() { 7923 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 7924 } 7925 7926 /** 7927 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 7928 * {@link #setTranslationY(float) translationY} property to be the difference between 7929 * the y value passed in and the current {@link #getTop() top} property. 7930 * 7931 * @param y The visual y position of this view, in pixels. 7932 */ 7933 public void setY(float y) { 7934 setTranslationY(y - mTop); 7935 } 7936 7937 7938 /** 7939 * The horizontal location of this view relative to its {@link #getLeft() left} position. 7940 * This position is post-layout, in addition to wherever the object's 7941 * layout placed it. 7942 * 7943 * @return The horizontal position of this view relative to its left position, in pixels. 7944 */ 7945 @ViewDebug.ExportedProperty(category = "drawing") 7946 public float getTranslationX() { 7947 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 7948 } 7949 7950 /** 7951 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 7952 * This effectively positions the object post-layout, in addition to wherever the object's 7953 * layout placed it. 7954 * 7955 * @param translationX The horizontal position of this view relative to its left position, 7956 * in pixels. 7957 * 7958 * @attr ref android.R.styleable#View_translationX 7959 */ 7960 public void setTranslationX(float translationX) { 7961 ensureTransformationInfo(); 7962 final TransformationInfo info = mTransformationInfo; 7963 if (info.mTranslationX != translationX) { 7964 invalidateParentCaches(); 7965 // Double-invalidation is necessary to capture view's old and new areas 7966 invalidate(false); 7967 info.mTranslationX = translationX; 7968 info.mMatrixDirty = true; 7969 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7970 invalidate(false); 7971 } 7972 } 7973 7974 /** 7975 * The horizontal location of this view relative to its {@link #getTop() top} position. 7976 * This position is post-layout, in addition to wherever the object's 7977 * layout placed it. 7978 * 7979 * @return The vertical position of this view relative to its top position, 7980 * in pixels. 7981 */ 7982 @ViewDebug.ExportedProperty(category = "drawing") 7983 public float getTranslationY() { 7984 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 7985 } 7986 7987 /** 7988 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 7989 * This effectively positions the object post-layout, in addition to wherever the object's 7990 * layout placed it. 7991 * 7992 * @param translationY The vertical position of this view relative to its top position, 7993 * in pixels. 7994 * 7995 * @attr ref android.R.styleable#View_translationY 7996 */ 7997 public void setTranslationY(float translationY) { 7998 ensureTransformationInfo(); 7999 final TransformationInfo info = mTransformationInfo; 8000 if (info.mTranslationY != translationY) { 8001 invalidateParentCaches(); 8002 // Double-invalidation is necessary to capture view's old and new areas 8003 invalidate(false); 8004 info.mTranslationY = translationY; 8005 info.mMatrixDirty = true; 8006 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8007 invalidate(false); 8008 } 8009 } 8010 8011 /** 8012 * Hit rectangle in parent's coordinates 8013 * 8014 * @param outRect The hit rectangle of the view. 8015 */ 8016 public void getHitRect(Rect outRect) { 8017 updateMatrix(); 8018 final TransformationInfo info = mTransformationInfo; 8019 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 8020 outRect.set(mLeft, mTop, mRight, mBottom); 8021 } else { 8022 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 8023 tmpRect.set(-info.mPivotX, -info.mPivotY, 8024 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 8025 info.mMatrix.mapRect(tmpRect); 8026 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 8027 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 8028 } 8029 } 8030 8031 /** 8032 * Determines whether the given point, in local coordinates is inside the view. 8033 */ 8034 /*package*/ final boolean pointInView(float localX, float localY) { 8035 return localX >= 0 && localX < (mRight - mLeft) 8036 && localY >= 0 && localY < (mBottom - mTop); 8037 } 8038 8039 /** 8040 * Utility method to determine whether the given point, in local coordinates, 8041 * is inside the view, where the area of the view is expanded by the slop factor. 8042 * This method is called while processing touch-move events to determine if the event 8043 * is still within the view. 8044 */ 8045 private boolean pointInView(float localX, float localY, float slop) { 8046 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 8047 localY < ((mBottom - mTop) + slop); 8048 } 8049 8050 /** 8051 * When a view has focus and the user navigates away from it, the next view is searched for 8052 * starting from the rectangle filled in by this method. 8053 * 8054 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 8055 * of the view. However, if your view maintains some idea of internal selection, 8056 * such as a cursor, or a selected row or column, you should override this method and 8057 * fill in a more specific rectangle. 8058 * 8059 * @param r The rectangle to fill in, in this view's coordinates. 8060 */ 8061 public void getFocusedRect(Rect r) { 8062 getDrawingRect(r); 8063 } 8064 8065 /** 8066 * If some part of this view is not clipped by any of its parents, then 8067 * return that area in r in global (root) coordinates. To convert r to local 8068 * coordinates (without taking possible View rotations into account), offset 8069 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 8070 * If the view is completely clipped or translated out, return false. 8071 * 8072 * @param r If true is returned, r holds the global coordinates of the 8073 * visible portion of this view. 8074 * @param globalOffset If true is returned, globalOffset holds the dx,dy 8075 * between this view and its root. globalOffet may be null. 8076 * @return true if r is non-empty (i.e. part of the view is visible at the 8077 * root level. 8078 */ 8079 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 8080 int width = mRight - mLeft; 8081 int height = mBottom - mTop; 8082 if (width > 0 && height > 0) { 8083 r.set(0, 0, width, height); 8084 if (globalOffset != null) { 8085 globalOffset.set(-mScrollX, -mScrollY); 8086 } 8087 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 8088 } 8089 return false; 8090 } 8091 8092 public final boolean getGlobalVisibleRect(Rect r) { 8093 return getGlobalVisibleRect(r, null); 8094 } 8095 8096 public final boolean getLocalVisibleRect(Rect r) { 8097 Point offset = new Point(); 8098 if (getGlobalVisibleRect(r, offset)) { 8099 r.offset(-offset.x, -offset.y); // make r local 8100 return true; 8101 } 8102 return false; 8103 } 8104 8105 /** 8106 * Offset this view's vertical location by the specified number of pixels. 8107 * 8108 * @param offset the number of pixels to offset the view by 8109 */ 8110 public void offsetTopAndBottom(int offset) { 8111 if (offset != 0) { 8112 updateMatrix(); 8113 final boolean matrixIsIdentity = mTransformationInfo == null 8114 || mTransformationInfo.mMatrixIsIdentity; 8115 if (matrixIsIdentity) { 8116 final ViewParent p = mParent; 8117 if (p != null && mAttachInfo != null) { 8118 final Rect r = mAttachInfo.mTmpInvalRect; 8119 int minTop; 8120 int maxBottom; 8121 int yLoc; 8122 if (offset < 0) { 8123 minTop = mTop + offset; 8124 maxBottom = mBottom; 8125 yLoc = offset; 8126 } else { 8127 minTop = mTop; 8128 maxBottom = mBottom + offset; 8129 yLoc = 0; 8130 } 8131 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 8132 p.invalidateChild(this, r); 8133 } 8134 } else { 8135 invalidate(false); 8136 } 8137 8138 mTop += offset; 8139 mBottom += offset; 8140 8141 if (!matrixIsIdentity) { 8142 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8143 invalidate(false); 8144 } 8145 invalidateParentIfNeeded(); 8146 } 8147 } 8148 8149 /** 8150 * Offset this view's horizontal location by the specified amount of pixels. 8151 * 8152 * @param offset the numer of pixels to offset the view by 8153 */ 8154 public void offsetLeftAndRight(int offset) { 8155 if (offset != 0) { 8156 updateMatrix(); 8157 final boolean matrixIsIdentity = mTransformationInfo == null 8158 || mTransformationInfo.mMatrixIsIdentity; 8159 if (matrixIsIdentity) { 8160 final ViewParent p = mParent; 8161 if (p != null && mAttachInfo != null) { 8162 final Rect r = mAttachInfo.mTmpInvalRect; 8163 int minLeft; 8164 int maxRight; 8165 if (offset < 0) { 8166 minLeft = mLeft + offset; 8167 maxRight = mRight; 8168 } else { 8169 minLeft = mLeft; 8170 maxRight = mRight + offset; 8171 } 8172 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 8173 p.invalidateChild(this, r); 8174 } 8175 } else { 8176 invalidate(false); 8177 } 8178 8179 mLeft += offset; 8180 mRight += offset; 8181 8182 if (!matrixIsIdentity) { 8183 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8184 invalidate(false); 8185 } 8186 invalidateParentIfNeeded(); 8187 } 8188 } 8189 8190 /** 8191 * Get the LayoutParams associated with this view. All views should have 8192 * layout parameters. These supply parameters to the <i>parent</i> of this 8193 * view specifying how it should be arranged. There are many subclasses of 8194 * ViewGroup.LayoutParams, and these correspond to the different subclasses 8195 * of ViewGroup that are responsible for arranging their children. 8196 * 8197 * This method may return null if this View is not attached to a parent 8198 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 8199 * was not invoked successfully. When a View is attached to a parent 8200 * ViewGroup, this method must not return null. 8201 * 8202 * @return The LayoutParams associated with this view, or null if no 8203 * parameters have been set yet 8204 */ 8205 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 8206 public ViewGroup.LayoutParams getLayoutParams() { 8207 return mLayoutParams; 8208 } 8209 8210 /** 8211 * Set the layout parameters associated with this view. These supply 8212 * parameters to the <i>parent</i> of this view specifying how it should be 8213 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 8214 * correspond to the different subclasses of ViewGroup that are responsible 8215 * for arranging their children. 8216 * 8217 * @param params The layout parameters for this view, cannot be null 8218 */ 8219 public void setLayoutParams(ViewGroup.LayoutParams params) { 8220 if (params == null) { 8221 throw new NullPointerException("Layout parameters cannot be null"); 8222 } 8223 mLayoutParams = params; 8224 if (mParent instanceof ViewGroup) { 8225 ((ViewGroup) mParent).onSetLayoutParams(this, params); 8226 } 8227 requestLayout(); 8228 } 8229 8230 /** 8231 * Set the scrolled position of your view. This will cause a call to 8232 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8233 * invalidated. 8234 * @param x the x position to scroll to 8235 * @param y the y position to scroll to 8236 */ 8237 public void scrollTo(int x, int y) { 8238 if (mScrollX != x || mScrollY != y) { 8239 int oldX = mScrollX; 8240 int oldY = mScrollY; 8241 mScrollX = x; 8242 mScrollY = y; 8243 invalidateParentCaches(); 8244 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 8245 if (!awakenScrollBars()) { 8246 invalidate(true); 8247 } 8248 } 8249 } 8250 8251 /** 8252 * Move the scrolled position of your view. This will cause a call to 8253 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8254 * invalidated. 8255 * @param x the amount of pixels to scroll by horizontally 8256 * @param y the amount of pixels to scroll by vertically 8257 */ 8258 public void scrollBy(int x, int y) { 8259 scrollTo(mScrollX + x, mScrollY + y); 8260 } 8261 8262 /** 8263 * <p>Trigger the scrollbars to draw. When invoked this method starts an 8264 * animation to fade the scrollbars out after a default delay. If a subclass 8265 * provides animated scrolling, the start delay should equal the duration 8266 * of the scrolling animation.</p> 8267 * 8268 * <p>The animation starts only if at least one of the scrollbars is 8269 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 8270 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8271 * this method returns true, and false otherwise. If the animation is 8272 * started, this method calls {@link #invalidate()}; in that case the 8273 * caller should not call {@link #invalidate()}.</p> 8274 * 8275 * <p>This method should be invoked every time a subclass directly updates 8276 * the scroll parameters.</p> 8277 * 8278 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 8279 * and {@link #scrollTo(int, int)}.</p> 8280 * 8281 * @return true if the animation is played, false otherwise 8282 * 8283 * @see #awakenScrollBars(int) 8284 * @see #scrollBy(int, int) 8285 * @see #scrollTo(int, int) 8286 * @see #isHorizontalScrollBarEnabled() 8287 * @see #isVerticalScrollBarEnabled() 8288 * @see #setHorizontalScrollBarEnabled(boolean) 8289 * @see #setVerticalScrollBarEnabled(boolean) 8290 */ 8291 protected boolean awakenScrollBars() { 8292 return mScrollCache != null && 8293 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 8294 } 8295 8296 /** 8297 * Trigger the scrollbars to draw. 8298 * This method differs from awakenScrollBars() only in its default duration. 8299 * initialAwakenScrollBars() will show the scroll bars for longer than 8300 * usual to give the user more of a chance to notice them. 8301 * 8302 * @return true if the animation is played, false otherwise. 8303 */ 8304 private boolean initialAwakenScrollBars() { 8305 return mScrollCache != null && 8306 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 8307 } 8308 8309 /** 8310 * <p> 8311 * Trigger the scrollbars to draw. When invoked this method starts an 8312 * animation to fade the scrollbars out after a fixed delay. If a subclass 8313 * provides animated scrolling, the start delay should equal the duration of 8314 * the scrolling animation. 8315 * </p> 8316 * 8317 * <p> 8318 * The animation starts only if at least one of the scrollbars is enabled, 8319 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8320 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8321 * this method returns true, and false otherwise. If the animation is 8322 * started, this method calls {@link #invalidate()}; in that case the caller 8323 * should not call {@link #invalidate()}. 8324 * </p> 8325 * 8326 * <p> 8327 * This method should be invoked everytime a subclass directly updates the 8328 * scroll parameters. 8329 * </p> 8330 * 8331 * @param startDelay the delay, in milliseconds, after which the animation 8332 * should start; when the delay is 0, the animation starts 8333 * immediately 8334 * @return true if the animation is played, false otherwise 8335 * 8336 * @see #scrollBy(int, int) 8337 * @see #scrollTo(int, int) 8338 * @see #isHorizontalScrollBarEnabled() 8339 * @see #isVerticalScrollBarEnabled() 8340 * @see #setHorizontalScrollBarEnabled(boolean) 8341 * @see #setVerticalScrollBarEnabled(boolean) 8342 */ 8343 protected boolean awakenScrollBars(int startDelay) { 8344 return awakenScrollBars(startDelay, true); 8345 } 8346 8347 /** 8348 * <p> 8349 * Trigger the scrollbars to draw. When invoked this method starts an 8350 * animation to fade the scrollbars out after a fixed delay. If a subclass 8351 * provides animated scrolling, the start delay should equal the duration of 8352 * the scrolling animation. 8353 * </p> 8354 * 8355 * <p> 8356 * The animation starts only if at least one of the scrollbars is enabled, 8357 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8358 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8359 * this method returns true, and false otherwise. If the animation is 8360 * started, this method calls {@link #invalidate()} if the invalidate parameter 8361 * is set to true; in that case the caller 8362 * should not call {@link #invalidate()}. 8363 * </p> 8364 * 8365 * <p> 8366 * This method should be invoked everytime a subclass directly updates the 8367 * scroll parameters. 8368 * </p> 8369 * 8370 * @param startDelay the delay, in milliseconds, after which the animation 8371 * should start; when the delay is 0, the animation starts 8372 * immediately 8373 * 8374 * @param invalidate Wheter this method should call invalidate 8375 * 8376 * @return true if the animation is played, false otherwise 8377 * 8378 * @see #scrollBy(int, int) 8379 * @see #scrollTo(int, int) 8380 * @see #isHorizontalScrollBarEnabled() 8381 * @see #isVerticalScrollBarEnabled() 8382 * @see #setHorizontalScrollBarEnabled(boolean) 8383 * @see #setVerticalScrollBarEnabled(boolean) 8384 */ 8385 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 8386 final ScrollabilityCache scrollCache = mScrollCache; 8387 8388 if (scrollCache == null || !scrollCache.fadeScrollBars) { 8389 return false; 8390 } 8391 8392 if (scrollCache.scrollBar == null) { 8393 scrollCache.scrollBar = new ScrollBarDrawable(); 8394 } 8395 8396 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 8397 8398 if (invalidate) { 8399 // Invalidate to show the scrollbars 8400 invalidate(true); 8401 } 8402 8403 if (scrollCache.state == ScrollabilityCache.OFF) { 8404 // FIXME: this is copied from WindowManagerService. 8405 // We should get this value from the system when it 8406 // is possible to do so. 8407 final int KEY_REPEAT_FIRST_DELAY = 750; 8408 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 8409 } 8410 8411 // Tell mScrollCache when we should start fading. This may 8412 // extend the fade start time if one was already scheduled 8413 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 8414 scrollCache.fadeStartTime = fadeStartTime; 8415 scrollCache.state = ScrollabilityCache.ON; 8416 8417 // Schedule our fader to run, unscheduling any old ones first 8418 if (mAttachInfo != null) { 8419 mAttachInfo.mHandler.removeCallbacks(scrollCache); 8420 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 8421 } 8422 8423 return true; 8424 } 8425 8426 return false; 8427 } 8428 8429 /** 8430 * Do not invalidate views which are not visible and which are not running an animation. They 8431 * will not get drawn and they should not set dirty flags as if they will be drawn 8432 */ 8433 private boolean skipInvalidate() { 8434 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 8435 (!(mParent instanceof ViewGroup) || 8436 !((ViewGroup) mParent).isViewTransitioning(this)); 8437 } 8438 /** 8439 * Mark the area defined by dirty as needing to be drawn. If the view is 8440 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 8441 * in the future. This must be called from a UI thread. To call from a non-UI 8442 * thread, call {@link #postInvalidate()}. 8443 * 8444 * WARNING: This method is destructive to dirty. 8445 * @param dirty the rectangle representing the bounds of the dirty region 8446 */ 8447 public void invalidate(Rect dirty) { 8448 if (ViewDebug.TRACE_HIERARCHY) { 8449 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8450 } 8451 8452 if (skipInvalidate()) { 8453 return; 8454 } 8455 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8456 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8457 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8458 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8459 mPrivateFlags |= INVALIDATED; 8460 mPrivateFlags |= DIRTY; 8461 final ViewParent p = mParent; 8462 final AttachInfo ai = mAttachInfo; 8463 //noinspection PointlessBooleanExpression,ConstantConditions 8464 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8465 if (p != null && ai != null && ai.mHardwareAccelerated) { 8466 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8467 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8468 p.invalidateChild(this, null); 8469 return; 8470 } 8471 } 8472 if (p != null && ai != null) { 8473 final int scrollX = mScrollX; 8474 final int scrollY = mScrollY; 8475 final Rect r = ai.mTmpInvalRect; 8476 r.set(dirty.left - scrollX, dirty.top - scrollY, 8477 dirty.right - scrollX, dirty.bottom - scrollY); 8478 mParent.invalidateChild(this, r); 8479 } 8480 } 8481 } 8482 8483 /** 8484 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 8485 * The coordinates of the dirty rect are relative to the view. 8486 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 8487 * will be called at some point in the future. This must be called from 8488 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 8489 * @param l the left position of the dirty region 8490 * @param t the top position of the dirty region 8491 * @param r the right position of the dirty region 8492 * @param b the bottom position of the dirty region 8493 */ 8494 public void invalidate(int l, int t, int r, int b) { 8495 if (ViewDebug.TRACE_HIERARCHY) { 8496 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8497 } 8498 8499 if (skipInvalidate()) { 8500 return; 8501 } 8502 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8503 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8504 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8505 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8506 mPrivateFlags |= INVALIDATED; 8507 mPrivateFlags |= DIRTY; 8508 final ViewParent p = mParent; 8509 final AttachInfo ai = mAttachInfo; 8510 //noinspection PointlessBooleanExpression,ConstantConditions 8511 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8512 if (p != null && ai != null && ai.mHardwareAccelerated) { 8513 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8514 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8515 p.invalidateChild(this, null); 8516 return; 8517 } 8518 } 8519 if (p != null && ai != null && l < r && t < b) { 8520 final int scrollX = mScrollX; 8521 final int scrollY = mScrollY; 8522 final Rect tmpr = ai.mTmpInvalRect; 8523 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 8524 p.invalidateChild(this, tmpr); 8525 } 8526 } 8527 } 8528 8529 /** 8530 * Invalidate the whole view. If the view is visible, 8531 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 8532 * the future. This must be called from a UI thread. To call from a non-UI thread, 8533 * call {@link #postInvalidate()}. 8534 */ 8535 public void invalidate() { 8536 invalidate(true); 8537 } 8538 8539 /** 8540 * This is where the invalidate() work actually happens. A full invalidate() 8541 * causes the drawing cache to be invalidated, but this function can be called with 8542 * invalidateCache set to false to skip that invalidation step for cases that do not 8543 * need it (for example, a component that remains at the same dimensions with the same 8544 * content). 8545 * 8546 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 8547 * well. This is usually true for a full invalidate, but may be set to false if the 8548 * View's contents or dimensions have not changed. 8549 */ 8550 void invalidate(boolean invalidateCache) { 8551 if (ViewDebug.TRACE_HIERARCHY) { 8552 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8553 } 8554 8555 if (skipInvalidate()) { 8556 return; 8557 } 8558 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8559 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 8560 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 8561 mLastIsOpaque = isOpaque(); 8562 mPrivateFlags &= ~DRAWN; 8563 mPrivateFlags |= DIRTY; 8564 if (invalidateCache) { 8565 mPrivateFlags |= INVALIDATED; 8566 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8567 } 8568 final AttachInfo ai = mAttachInfo; 8569 final ViewParent p = mParent; 8570 //noinspection PointlessBooleanExpression,ConstantConditions 8571 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8572 if (p != null && ai != null && ai.mHardwareAccelerated) { 8573 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8574 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8575 p.invalidateChild(this, null); 8576 return; 8577 } 8578 } 8579 8580 if (p != null && ai != null) { 8581 final Rect r = ai.mTmpInvalRect; 8582 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8583 // Don't call invalidate -- we don't want to internally scroll 8584 // our own bounds 8585 p.invalidateChild(this, r); 8586 } 8587 } 8588 } 8589 8590 /** 8591 * Used to indicate that the parent of this view should clear its caches. This functionality 8592 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8593 * which is necessary when various parent-managed properties of the view change, such as 8594 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 8595 * clears the parent caches and does not causes an invalidate event. 8596 * 8597 * @hide 8598 */ 8599 protected void invalidateParentCaches() { 8600 if (mParent instanceof View) { 8601 ((View) mParent).mPrivateFlags |= INVALIDATED; 8602 } 8603 } 8604 8605 /** 8606 * Used to indicate that the parent of this view should be invalidated. This functionality 8607 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8608 * which is necessary when various parent-managed properties of the view change, such as 8609 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 8610 * an invalidation event to the parent. 8611 * 8612 * @hide 8613 */ 8614 protected void invalidateParentIfNeeded() { 8615 if (isHardwareAccelerated() && mParent instanceof View) { 8616 ((View) mParent).invalidate(true); 8617 } 8618 } 8619 8620 /** 8621 * Indicates whether this View is opaque. An opaque View guarantees that it will 8622 * draw all the pixels overlapping its bounds using a fully opaque color. 8623 * 8624 * Subclasses of View should override this method whenever possible to indicate 8625 * whether an instance is opaque. Opaque Views are treated in a special way by 8626 * the View hierarchy, possibly allowing it to perform optimizations during 8627 * invalidate/draw passes. 8628 * 8629 * @return True if this View is guaranteed to be fully opaque, false otherwise. 8630 */ 8631 @ViewDebug.ExportedProperty(category = "drawing") 8632 public boolean isOpaque() { 8633 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 8634 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 8635 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 8636 } 8637 8638 /** 8639 * @hide 8640 */ 8641 protected void computeOpaqueFlags() { 8642 // Opaque if: 8643 // - Has a background 8644 // - Background is opaque 8645 // - Doesn't have scrollbars or scrollbars are inside overlay 8646 8647 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 8648 mPrivateFlags |= OPAQUE_BACKGROUND; 8649 } else { 8650 mPrivateFlags &= ~OPAQUE_BACKGROUND; 8651 } 8652 8653 final int flags = mViewFlags; 8654 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 8655 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 8656 mPrivateFlags |= OPAQUE_SCROLLBARS; 8657 } else { 8658 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 8659 } 8660 } 8661 8662 /** 8663 * @hide 8664 */ 8665 protected boolean hasOpaqueScrollbars() { 8666 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 8667 } 8668 8669 /** 8670 * @return A handler associated with the thread running the View. This 8671 * handler can be used to pump events in the UI events queue. 8672 */ 8673 public Handler getHandler() { 8674 if (mAttachInfo != null) { 8675 return mAttachInfo.mHandler; 8676 } 8677 return null; 8678 } 8679 8680 /** 8681 * <p>Causes the Runnable to be added to the message queue. 8682 * The runnable will be run on the user interface thread.</p> 8683 * 8684 * <p>This method can be invoked from outside of the UI thread 8685 * only when this View is attached to a window.</p> 8686 * 8687 * @param action The Runnable that will be executed. 8688 * 8689 * @return Returns true if the Runnable was successfully placed in to the 8690 * message queue. Returns false on failure, usually because the 8691 * looper processing the message queue is exiting. 8692 */ 8693 public boolean post(Runnable action) { 8694 Handler handler; 8695 AttachInfo attachInfo = mAttachInfo; 8696 if (attachInfo != null) { 8697 handler = attachInfo.mHandler; 8698 } else { 8699 // Assume that post will succeed later 8700 ViewRootImpl.getRunQueue().post(action); 8701 return true; 8702 } 8703 8704 return handler.post(action); 8705 } 8706 8707 /** 8708 * <p>Causes the Runnable to be added to the message queue, to be run 8709 * after the specified amount of time elapses. 8710 * The runnable will be run on the user interface thread.</p> 8711 * 8712 * <p>This method can be invoked from outside of the UI thread 8713 * only when this View is attached to a window.</p> 8714 * 8715 * @param action The Runnable that will be executed. 8716 * @param delayMillis The delay (in milliseconds) until the Runnable 8717 * will be executed. 8718 * 8719 * @return true if the Runnable was successfully placed in to the 8720 * message queue. Returns false on failure, usually because the 8721 * looper processing the message queue is exiting. Note that a 8722 * result of true does not mean the Runnable will be processed -- 8723 * if the looper is quit before the delivery time of the message 8724 * occurs then the message will be dropped. 8725 */ 8726 public boolean postDelayed(Runnable action, long delayMillis) { 8727 Handler handler; 8728 AttachInfo attachInfo = mAttachInfo; 8729 if (attachInfo != null) { 8730 handler = attachInfo.mHandler; 8731 } else { 8732 // Assume that post will succeed later 8733 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 8734 return true; 8735 } 8736 8737 return handler.postDelayed(action, delayMillis); 8738 } 8739 8740 /** 8741 * <p>Removes the specified Runnable from the message queue.</p> 8742 * 8743 * <p>This method can be invoked from outside of the UI thread 8744 * only when this View is attached to a window.</p> 8745 * 8746 * @param action The Runnable to remove from the message handling queue 8747 * 8748 * @return true if this view could ask the Handler to remove the Runnable, 8749 * false otherwise. When the returned value is true, the Runnable 8750 * may or may not have been actually removed from the message queue 8751 * (for instance, if the Runnable was not in the queue already.) 8752 */ 8753 public boolean removeCallbacks(Runnable action) { 8754 Handler handler; 8755 AttachInfo attachInfo = mAttachInfo; 8756 if (attachInfo != null) { 8757 handler = attachInfo.mHandler; 8758 } else { 8759 // Assume that post will succeed later 8760 ViewRootImpl.getRunQueue().removeCallbacks(action); 8761 return true; 8762 } 8763 8764 handler.removeCallbacks(action); 8765 return true; 8766 } 8767 8768 /** 8769 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 8770 * Use this to invalidate the View from a non-UI thread.</p> 8771 * 8772 * <p>This method can be invoked from outside of the UI thread 8773 * only when this View is attached to a window.</p> 8774 * 8775 * @see #invalidate() 8776 */ 8777 public void postInvalidate() { 8778 postInvalidateDelayed(0); 8779 } 8780 8781 /** 8782 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8783 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 8784 * 8785 * <p>This method can be invoked from outside of the UI thread 8786 * only when this View is attached to a window.</p> 8787 * 8788 * @param left The left coordinate of the rectangle to invalidate. 8789 * @param top The top coordinate of the rectangle to invalidate. 8790 * @param right The right coordinate of the rectangle to invalidate. 8791 * @param bottom The bottom coordinate of the rectangle to invalidate. 8792 * 8793 * @see #invalidate(int, int, int, int) 8794 * @see #invalidate(Rect) 8795 */ 8796 public void postInvalidate(int left, int top, int right, int bottom) { 8797 postInvalidateDelayed(0, left, top, right, bottom); 8798 } 8799 8800 /** 8801 * <p>Cause an invalidate to happen on a subsequent cycle through the event 8802 * loop. Waits for the specified amount of time.</p> 8803 * 8804 * <p>This method can be invoked from outside of the UI thread 8805 * only when this View is attached to a window.</p> 8806 * 8807 * @param delayMilliseconds the duration in milliseconds to delay the 8808 * invalidation by 8809 */ 8810 public void postInvalidateDelayed(long delayMilliseconds) { 8811 // We try only with the AttachInfo because there's no point in invalidating 8812 // if we are not attached to our window 8813 AttachInfo attachInfo = mAttachInfo; 8814 if (attachInfo != null) { 8815 Message msg = Message.obtain(); 8816 msg.what = AttachInfo.INVALIDATE_MSG; 8817 msg.obj = this; 8818 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8819 } 8820 } 8821 8822 /** 8823 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8824 * through the event loop. Waits for the specified amount of time.</p> 8825 * 8826 * <p>This method can be invoked from outside of the UI thread 8827 * only when this View is attached to a window.</p> 8828 * 8829 * @param delayMilliseconds the duration in milliseconds to delay the 8830 * invalidation by 8831 * @param left The left coordinate of the rectangle to invalidate. 8832 * @param top The top coordinate of the rectangle to invalidate. 8833 * @param right The right coordinate of the rectangle to invalidate. 8834 * @param bottom The bottom coordinate of the rectangle to invalidate. 8835 */ 8836 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 8837 int right, int bottom) { 8838 8839 // We try only with the AttachInfo because there's no point in invalidating 8840 // if we are not attached to our window 8841 AttachInfo attachInfo = mAttachInfo; 8842 if (attachInfo != null) { 8843 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 8844 info.target = this; 8845 info.left = left; 8846 info.top = top; 8847 info.right = right; 8848 info.bottom = bottom; 8849 8850 final Message msg = Message.obtain(); 8851 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 8852 msg.obj = info; 8853 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8854 } 8855 } 8856 8857 /** 8858 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 8859 * This event is sent at most once every 8860 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 8861 */ 8862 private void postSendViewScrolledAccessibilityEventCallback() { 8863 if (mSendViewScrolledAccessibilityEvent == null) { 8864 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 8865 } 8866 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 8867 mSendViewScrolledAccessibilityEvent.mIsPending = true; 8868 postDelayed(mSendViewScrolledAccessibilityEvent, 8869 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 8870 } 8871 } 8872 8873 /** 8874 * Called by a parent to request that a child update its values for mScrollX 8875 * and mScrollY if necessary. This will typically be done if the child is 8876 * animating a scroll using a {@link android.widget.Scroller Scroller} 8877 * object. 8878 */ 8879 public void computeScroll() { 8880 } 8881 8882 /** 8883 * <p>Indicate whether the horizontal edges are faded when the view is 8884 * scrolled horizontally.</p> 8885 * 8886 * @return true if the horizontal edges should are faded on scroll, false 8887 * otherwise 8888 * 8889 * @see #setHorizontalFadingEdgeEnabled(boolean) 8890 * @attr ref android.R.styleable#View_requiresFadingEdge 8891 */ 8892 public boolean isHorizontalFadingEdgeEnabled() { 8893 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 8894 } 8895 8896 /** 8897 * <p>Define whether the horizontal edges should be faded when this view 8898 * is scrolled horizontally.</p> 8899 * 8900 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 8901 * be faded when the view is scrolled 8902 * horizontally 8903 * 8904 * @see #isHorizontalFadingEdgeEnabled() 8905 * @attr ref android.R.styleable#View_requiresFadingEdge 8906 */ 8907 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 8908 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 8909 if (horizontalFadingEdgeEnabled) { 8910 initScrollCache(); 8911 } 8912 8913 mViewFlags ^= FADING_EDGE_HORIZONTAL; 8914 } 8915 } 8916 8917 /** 8918 * <p>Indicate whether the vertical edges are faded when the view is 8919 * scrolled horizontally.</p> 8920 * 8921 * @return true if the vertical edges should are faded on scroll, false 8922 * otherwise 8923 * 8924 * @see #setVerticalFadingEdgeEnabled(boolean) 8925 * @attr ref android.R.styleable#View_requiresFadingEdge 8926 */ 8927 public boolean isVerticalFadingEdgeEnabled() { 8928 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 8929 } 8930 8931 /** 8932 * <p>Define whether the vertical edges should be faded when this view 8933 * is scrolled vertically.</p> 8934 * 8935 * @param verticalFadingEdgeEnabled true if the vertical edges should 8936 * be faded when the view is scrolled 8937 * vertically 8938 * 8939 * @see #isVerticalFadingEdgeEnabled() 8940 * @attr ref android.R.styleable#View_requiresFadingEdge 8941 */ 8942 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 8943 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 8944 if (verticalFadingEdgeEnabled) { 8945 initScrollCache(); 8946 } 8947 8948 mViewFlags ^= FADING_EDGE_VERTICAL; 8949 } 8950 } 8951 8952 /** 8953 * Returns the strength, or intensity, of the top faded edge. The strength is 8954 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8955 * returns 0.0 or 1.0 but no value in between. 8956 * 8957 * Subclasses should override this method to provide a smoother fade transition 8958 * when scrolling occurs. 8959 * 8960 * @return the intensity of the top fade as a float between 0.0f and 1.0f 8961 */ 8962 protected float getTopFadingEdgeStrength() { 8963 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 8964 } 8965 8966 /** 8967 * Returns the strength, or intensity, of the bottom faded edge. The strength is 8968 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8969 * returns 0.0 or 1.0 but no value in between. 8970 * 8971 * Subclasses should override this method to provide a smoother fade transition 8972 * when scrolling occurs. 8973 * 8974 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 8975 */ 8976 protected float getBottomFadingEdgeStrength() { 8977 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 8978 computeVerticalScrollRange() ? 1.0f : 0.0f; 8979 } 8980 8981 /** 8982 * Returns the strength, or intensity, of the left faded edge. The strength is 8983 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8984 * returns 0.0 or 1.0 but no value in between. 8985 * 8986 * Subclasses should override this method to provide a smoother fade transition 8987 * when scrolling occurs. 8988 * 8989 * @return the intensity of the left fade as a float between 0.0f and 1.0f 8990 */ 8991 protected float getLeftFadingEdgeStrength() { 8992 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 8993 } 8994 8995 /** 8996 * Returns the strength, or intensity, of the right faded edge. The strength is 8997 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8998 * returns 0.0 or 1.0 but no value in between. 8999 * 9000 * Subclasses should override this method to provide a smoother fade transition 9001 * when scrolling occurs. 9002 * 9003 * @return the intensity of the right fade as a float between 0.0f and 1.0f 9004 */ 9005 protected float getRightFadingEdgeStrength() { 9006 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 9007 computeHorizontalScrollRange() ? 1.0f : 0.0f; 9008 } 9009 9010 /** 9011 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 9012 * scrollbar is not drawn by default.</p> 9013 * 9014 * @return true if the horizontal scrollbar should be painted, false 9015 * otherwise 9016 * 9017 * @see #setHorizontalScrollBarEnabled(boolean) 9018 */ 9019 public boolean isHorizontalScrollBarEnabled() { 9020 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9021 } 9022 9023 /** 9024 * <p>Define whether the horizontal scrollbar should be drawn or not. The 9025 * scrollbar is not drawn by default.</p> 9026 * 9027 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 9028 * be painted 9029 * 9030 * @see #isHorizontalScrollBarEnabled() 9031 */ 9032 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 9033 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 9034 mViewFlags ^= SCROLLBARS_HORIZONTAL; 9035 computeOpaqueFlags(); 9036 resolvePadding(); 9037 } 9038 } 9039 9040 /** 9041 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 9042 * scrollbar is not drawn by default.</p> 9043 * 9044 * @return true if the vertical scrollbar should be painted, false 9045 * otherwise 9046 * 9047 * @see #setVerticalScrollBarEnabled(boolean) 9048 */ 9049 public boolean isVerticalScrollBarEnabled() { 9050 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 9051 } 9052 9053 /** 9054 * <p>Define whether the vertical scrollbar should be drawn or not. The 9055 * scrollbar is not drawn by default.</p> 9056 * 9057 * @param verticalScrollBarEnabled true if the vertical scrollbar should 9058 * be painted 9059 * 9060 * @see #isVerticalScrollBarEnabled() 9061 */ 9062 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 9063 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 9064 mViewFlags ^= SCROLLBARS_VERTICAL; 9065 computeOpaqueFlags(); 9066 resolvePadding(); 9067 } 9068 } 9069 9070 /** 9071 * @hide 9072 */ 9073 protected void recomputePadding() { 9074 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 9075 } 9076 9077 /** 9078 * Define whether scrollbars will fade when the view is not scrolling. 9079 * 9080 * @param fadeScrollbars wheter to enable fading 9081 * 9082 */ 9083 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 9084 initScrollCache(); 9085 final ScrollabilityCache scrollabilityCache = mScrollCache; 9086 scrollabilityCache.fadeScrollBars = fadeScrollbars; 9087 if (fadeScrollbars) { 9088 scrollabilityCache.state = ScrollabilityCache.OFF; 9089 } else { 9090 scrollabilityCache.state = ScrollabilityCache.ON; 9091 } 9092 } 9093 9094 /** 9095 * 9096 * Returns true if scrollbars will fade when this view is not scrolling 9097 * 9098 * @return true if scrollbar fading is enabled 9099 */ 9100 public boolean isScrollbarFadingEnabled() { 9101 return mScrollCache != null && mScrollCache.fadeScrollBars; 9102 } 9103 9104 /** 9105 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 9106 * inset. When inset, they add to the padding of the view. And the scrollbars 9107 * can be drawn inside the padding area or on the edge of the view. For example, 9108 * if a view has a background drawable and you want to draw the scrollbars 9109 * inside the padding specified by the drawable, you can use 9110 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 9111 * appear at the edge of the view, ignoring the padding, then you can use 9112 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 9113 * @param style the style of the scrollbars. Should be one of 9114 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 9115 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 9116 * @see #SCROLLBARS_INSIDE_OVERLAY 9117 * @see #SCROLLBARS_INSIDE_INSET 9118 * @see #SCROLLBARS_OUTSIDE_OVERLAY 9119 * @see #SCROLLBARS_OUTSIDE_INSET 9120 */ 9121 public void setScrollBarStyle(int style) { 9122 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 9123 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 9124 computeOpaqueFlags(); 9125 resolvePadding(); 9126 } 9127 } 9128 9129 /** 9130 * <p>Returns the current scrollbar style.</p> 9131 * @return the current scrollbar style 9132 * @see #SCROLLBARS_INSIDE_OVERLAY 9133 * @see #SCROLLBARS_INSIDE_INSET 9134 * @see #SCROLLBARS_OUTSIDE_OVERLAY 9135 * @see #SCROLLBARS_OUTSIDE_INSET 9136 */ 9137 @ViewDebug.ExportedProperty(mapping = { 9138 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 9139 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 9140 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 9141 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 9142 }) 9143 public int getScrollBarStyle() { 9144 return mViewFlags & SCROLLBARS_STYLE_MASK; 9145 } 9146 9147 /** 9148 * <p>Compute the horizontal range that the horizontal scrollbar 9149 * represents.</p> 9150 * 9151 * <p>The range is expressed in arbitrary units that must be the same as the 9152 * units used by {@link #computeHorizontalScrollExtent()} and 9153 * {@link #computeHorizontalScrollOffset()}.</p> 9154 * 9155 * <p>The default range is the drawing width of this view.</p> 9156 * 9157 * @return the total horizontal range represented by the horizontal 9158 * scrollbar 9159 * 9160 * @see #computeHorizontalScrollExtent() 9161 * @see #computeHorizontalScrollOffset() 9162 * @see android.widget.ScrollBarDrawable 9163 */ 9164 protected int computeHorizontalScrollRange() { 9165 return getWidth(); 9166 } 9167 9168 /** 9169 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 9170 * within the horizontal range. This value is used to compute the position 9171 * of the thumb within the scrollbar's track.</p> 9172 * 9173 * <p>The range is expressed in arbitrary units that must be the same as the 9174 * units used by {@link #computeHorizontalScrollRange()} and 9175 * {@link #computeHorizontalScrollExtent()}.</p> 9176 * 9177 * <p>The default offset is the scroll offset of this view.</p> 9178 * 9179 * @return the horizontal offset of the scrollbar's thumb 9180 * 9181 * @see #computeHorizontalScrollRange() 9182 * @see #computeHorizontalScrollExtent() 9183 * @see android.widget.ScrollBarDrawable 9184 */ 9185 protected int computeHorizontalScrollOffset() { 9186 return mScrollX; 9187 } 9188 9189 /** 9190 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 9191 * within the horizontal range. This value is used to compute the length 9192 * of the thumb within the scrollbar's track.</p> 9193 * 9194 * <p>The range is expressed in arbitrary units that must be the same as the 9195 * units used by {@link #computeHorizontalScrollRange()} and 9196 * {@link #computeHorizontalScrollOffset()}.</p> 9197 * 9198 * <p>The default extent is the drawing width of this view.</p> 9199 * 9200 * @return the horizontal extent of the scrollbar's thumb 9201 * 9202 * @see #computeHorizontalScrollRange() 9203 * @see #computeHorizontalScrollOffset() 9204 * @see android.widget.ScrollBarDrawable 9205 */ 9206 protected int computeHorizontalScrollExtent() { 9207 return getWidth(); 9208 } 9209 9210 /** 9211 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 9212 * 9213 * <p>The range is expressed in arbitrary units that must be the same as the 9214 * units used by {@link #computeVerticalScrollExtent()} and 9215 * {@link #computeVerticalScrollOffset()}.</p> 9216 * 9217 * @return the total vertical range represented by the vertical scrollbar 9218 * 9219 * <p>The default range is the drawing height of this view.</p> 9220 * 9221 * @see #computeVerticalScrollExtent() 9222 * @see #computeVerticalScrollOffset() 9223 * @see android.widget.ScrollBarDrawable 9224 */ 9225 protected int computeVerticalScrollRange() { 9226 return getHeight(); 9227 } 9228 9229 /** 9230 * <p>Compute the vertical offset of the vertical scrollbar's thumb 9231 * within the horizontal range. This value is used to compute the position 9232 * of the thumb within the scrollbar's track.</p> 9233 * 9234 * <p>The range is expressed in arbitrary units that must be the same as the 9235 * units used by {@link #computeVerticalScrollRange()} and 9236 * {@link #computeVerticalScrollExtent()}.</p> 9237 * 9238 * <p>The default offset is the scroll offset of this view.</p> 9239 * 9240 * @return the vertical offset of the scrollbar's thumb 9241 * 9242 * @see #computeVerticalScrollRange() 9243 * @see #computeVerticalScrollExtent() 9244 * @see android.widget.ScrollBarDrawable 9245 */ 9246 protected int computeVerticalScrollOffset() { 9247 return mScrollY; 9248 } 9249 9250 /** 9251 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 9252 * within the vertical range. This value is used to compute the length 9253 * of the thumb within the scrollbar's track.</p> 9254 * 9255 * <p>The range is expressed in arbitrary units that must be the same as the 9256 * units used by {@link #computeVerticalScrollRange()} and 9257 * {@link #computeVerticalScrollOffset()}.</p> 9258 * 9259 * <p>The default extent is the drawing height of this view.</p> 9260 * 9261 * @return the vertical extent of the scrollbar's thumb 9262 * 9263 * @see #computeVerticalScrollRange() 9264 * @see #computeVerticalScrollOffset() 9265 * @see android.widget.ScrollBarDrawable 9266 */ 9267 protected int computeVerticalScrollExtent() { 9268 return getHeight(); 9269 } 9270 9271 /** 9272 * Check if this view can be scrolled horizontally in a certain direction. 9273 * 9274 * @param direction Negative to check scrolling left, positive to check scrolling right. 9275 * @return true if this view can be scrolled in the specified direction, false otherwise. 9276 */ 9277 public boolean canScrollHorizontally(int direction) { 9278 final int offset = computeHorizontalScrollOffset(); 9279 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 9280 if (range == 0) return false; 9281 if (direction < 0) { 9282 return offset > 0; 9283 } else { 9284 return offset < range - 1; 9285 } 9286 } 9287 9288 /** 9289 * Check if this view can be scrolled vertically in a certain direction. 9290 * 9291 * @param direction Negative to check scrolling up, positive to check scrolling down. 9292 * @return true if this view can be scrolled in the specified direction, false otherwise. 9293 */ 9294 public boolean canScrollVertically(int direction) { 9295 final int offset = computeVerticalScrollOffset(); 9296 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 9297 if (range == 0) return false; 9298 if (direction < 0) { 9299 return offset > 0; 9300 } else { 9301 return offset < range - 1; 9302 } 9303 } 9304 9305 /** 9306 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 9307 * scrollbars are painted only if they have been awakened first.</p> 9308 * 9309 * @param canvas the canvas on which to draw the scrollbars 9310 * 9311 * @see #awakenScrollBars(int) 9312 */ 9313 protected final void onDrawScrollBars(Canvas canvas) { 9314 // scrollbars are drawn only when the animation is running 9315 final ScrollabilityCache cache = mScrollCache; 9316 if (cache != null) { 9317 9318 int state = cache.state; 9319 9320 if (state == ScrollabilityCache.OFF) { 9321 return; 9322 } 9323 9324 boolean invalidate = false; 9325 9326 if (state == ScrollabilityCache.FADING) { 9327 // We're fading -- get our fade interpolation 9328 if (cache.interpolatorValues == null) { 9329 cache.interpolatorValues = new float[1]; 9330 } 9331 9332 float[] values = cache.interpolatorValues; 9333 9334 // Stops the animation if we're done 9335 if (cache.scrollBarInterpolator.timeToValues(values) == 9336 Interpolator.Result.FREEZE_END) { 9337 cache.state = ScrollabilityCache.OFF; 9338 } else { 9339 cache.scrollBar.setAlpha(Math.round(values[0])); 9340 } 9341 9342 // This will make the scroll bars inval themselves after 9343 // drawing. We only want this when we're fading so that 9344 // we prevent excessive redraws 9345 invalidate = true; 9346 } else { 9347 // We're just on -- but we may have been fading before so 9348 // reset alpha 9349 cache.scrollBar.setAlpha(255); 9350 } 9351 9352 9353 final int viewFlags = mViewFlags; 9354 9355 final boolean drawHorizontalScrollBar = 9356 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9357 final boolean drawVerticalScrollBar = 9358 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 9359 && !isVerticalScrollBarHidden(); 9360 9361 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 9362 final int width = mRight - mLeft; 9363 final int height = mBottom - mTop; 9364 9365 final ScrollBarDrawable scrollBar = cache.scrollBar; 9366 9367 final int scrollX = mScrollX; 9368 final int scrollY = mScrollY; 9369 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 9370 9371 int left, top, right, bottom; 9372 9373 if (drawHorizontalScrollBar) { 9374 int size = scrollBar.getSize(false); 9375 if (size <= 0) { 9376 size = cache.scrollBarSize; 9377 } 9378 9379 scrollBar.setParameters(computeHorizontalScrollRange(), 9380 computeHorizontalScrollOffset(), 9381 computeHorizontalScrollExtent(), false); 9382 final int verticalScrollBarGap = drawVerticalScrollBar ? 9383 getVerticalScrollbarWidth() : 0; 9384 top = scrollY + height - size - (mUserPaddingBottom & inside); 9385 left = scrollX + (mPaddingLeft & inside); 9386 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 9387 bottom = top + size; 9388 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 9389 if (invalidate) { 9390 invalidate(left, top, right, bottom); 9391 } 9392 } 9393 9394 if (drawVerticalScrollBar) { 9395 int size = scrollBar.getSize(true); 9396 if (size <= 0) { 9397 size = cache.scrollBarSize; 9398 } 9399 9400 scrollBar.setParameters(computeVerticalScrollRange(), 9401 computeVerticalScrollOffset(), 9402 computeVerticalScrollExtent(), true); 9403 switch (mVerticalScrollbarPosition) { 9404 default: 9405 case SCROLLBAR_POSITION_DEFAULT: 9406 case SCROLLBAR_POSITION_RIGHT: 9407 left = scrollX + width - size - (mUserPaddingRight & inside); 9408 break; 9409 case SCROLLBAR_POSITION_LEFT: 9410 left = scrollX + (mUserPaddingLeft & inside); 9411 break; 9412 } 9413 top = scrollY + (mPaddingTop & inside); 9414 right = left + size; 9415 bottom = scrollY + height - (mUserPaddingBottom & inside); 9416 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 9417 if (invalidate) { 9418 invalidate(left, top, right, bottom); 9419 } 9420 } 9421 } 9422 } 9423 } 9424 9425 /** 9426 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 9427 * FastScroller is visible. 9428 * @return whether to temporarily hide the vertical scrollbar 9429 * @hide 9430 */ 9431 protected boolean isVerticalScrollBarHidden() { 9432 return false; 9433 } 9434 9435 /** 9436 * <p>Draw the horizontal scrollbar if 9437 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 9438 * 9439 * @param canvas the canvas on which to draw the scrollbar 9440 * @param scrollBar the scrollbar's drawable 9441 * 9442 * @see #isHorizontalScrollBarEnabled() 9443 * @see #computeHorizontalScrollRange() 9444 * @see #computeHorizontalScrollExtent() 9445 * @see #computeHorizontalScrollOffset() 9446 * @see android.widget.ScrollBarDrawable 9447 * @hide 9448 */ 9449 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 9450 int l, int t, int r, int b) { 9451 scrollBar.setBounds(l, t, r, b); 9452 scrollBar.draw(canvas); 9453 } 9454 9455 /** 9456 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 9457 * returns true.</p> 9458 * 9459 * @param canvas the canvas on which to draw the scrollbar 9460 * @param scrollBar the scrollbar's drawable 9461 * 9462 * @see #isVerticalScrollBarEnabled() 9463 * @see #computeVerticalScrollRange() 9464 * @see #computeVerticalScrollExtent() 9465 * @see #computeVerticalScrollOffset() 9466 * @see android.widget.ScrollBarDrawable 9467 * @hide 9468 */ 9469 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 9470 int l, int t, int r, int b) { 9471 scrollBar.setBounds(l, t, r, b); 9472 scrollBar.draw(canvas); 9473 } 9474 9475 /** 9476 * Implement this to do your drawing. 9477 * 9478 * @param canvas the canvas on which the background will be drawn 9479 */ 9480 protected void onDraw(Canvas canvas) { 9481 } 9482 9483 /* 9484 * Caller is responsible for calling requestLayout if necessary. 9485 * (This allows addViewInLayout to not request a new layout.) 9486 */ 9487 void assignParent(ViewParent parent) { 9488 if (mParent == null) { 9489 mParent = parent; 9490 } else if (parent == null) { 9491 mParent = null; 9492 } else { 9493 throw new RuntimeException("view " + this + " being added, but" 9494 + " it already has a parent"); 9495 } 9496 } 9497 9498 /** 9499 * This is called when the view is attached to a window. At this point it 9500 * has a Surface and will start drawing. Note that this function is 9501 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 9502 * however it may be called any time before the first onDraw -- including 9503 * before or after {@link #onMeasure(int, int)}. 9504 * 9505 * @see #onDetachedFromWindow() 9506 */ 9507 protected void onAttachedToWindow() { 9508 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 9509 mParent.requestTransparentRegion(this); 9510 } 9511 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 9512 initialAwakenScrollBars(); 9513 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 9514 } 9515 jumpDrawablesToCurrentState(); 9516 // Order is important here: LayoutDirection MUST be resolved before Padding 9517 // and TextDirection 9518 resolveLayoutDirectionIfNeeded(); 9519 resolvePadding(); 9520 resolveTextDirection(); 9521 if (isFocused()) { 9522 InputMethodManager imm = InputMethodManager.peekInstance(); 9523 imm.focusIn(this); 9524 } 9525 } 9526 9527 /** 9528 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 9529 * that the parent directionality can and will be resolved before its children. 9530 */ 9531 private void resolveLayoutDirectionIfNeeded() { 9532 // Do not resolve if it is not needed 9533 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) == LAYOUT_DIRECTION_RESOLVED) return; 9534 9535 // Clear any previous layout direction resolution 9536 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_RTL; 9537 9538 // Reset also TextDirection as a change into LayoutDirection may impact the selected 9539 // TextDirectionHeuristic 9540 resetResolvedTextDirection(); 9541 9542 // Set resolved depending on layout direction 9543 switch (getLayoutDirection()) { 9544 case LAYOUT_DIRECTION_INHERIT: 9545 // We cannot do the resolution if there is no parent 9546 if (mParent == null) return; 9547 9548 // If this is root view, no need to look at parent's layout dir. 9549 if (mParent instanceof ViewGroup) { 9550 ViewGroup viewGroup = ((ViewGroup) mParent); 9551 9552 // Check if the parent view group can resolve 9553 if (! viewGroup.canResolveLayoutDirection()) { 9554 return; 9555 } 9556 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 9557 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9558 } 9559 } 9560 break; 9561 case LAYOUT_DIRECTION_RTL: 9562 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9563 break; 9564 case LAYOUT_DIRECTION_LOCALE: 9565 if(isLayoutDirectionRtl(Locale.getDefault())) { 9566 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9567 } 9568 break; 9569 default: 9570 // Nothing to do, LTR by default 9571 } 9572 9573 // Set to resolved 9574 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 9575 } 9576 9577 /** 9578 * @hide 9579 */ 9580 protected void resolvePadding() { 9581 // If the user specified the absolute padding (either with android:padding or 9582 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 9583 // use the default padding or the padding from the background drawable 9584 // (stored at this point in mPadding*) 9585 switch (getResolvedLayoutDirection()) { 9586 case LAYOUT_DIRECTION_RTL: 9587 // Start user padding override Right user padding. Otherwise, if Right user 9588 // padding is not defined, use the default Right padding. If Right user padding 9589 // is defined, just use it. 9590 if (mUserPaddingStart >= 0) { 9591 mUserPaddingRight = mUserPaddingStart; 9592 } else if (mUserPaddingRight < 0) { 9593 mUserPaddingRight = mPaddingRight; 9594 } 9595 if (mUserPaddingEnd >= 0) { 9596 mUserPaddingLeft = mUserPaddingEnd; 9597 } else if (mUserPaddingLeft < 0) { 9598 mUserPaddingLeft = mPaddingLeft; 9599 } 9600 break; 9601 case LAYOUT_DIRECTION_LTR: 9602 default: 9603 // Start user padding override Left user padding. Otherwise, if Left user 9604 // padding is not defined, use the default left padding. If Left user padding 9605 // is defined, just use it. 9606 if (mUserPaddingStart >= 0) { 9607 mUserPaddingLeft = mUserPaddingStart; 9608 } else if (mUserPaddingLeft < 0) { 9609 mUserPaddingLeft = mPaddingLeft; 9610 } 9611 if (mUserPaddingEnd >= 0) { 9612 mUserPaddingRight = mUserPaddingEnd; 9613 } else if (mUserPaddingRight < 0) { 9614 mUserPaddingRight = mPaddingRight; 9615 } 9616 } 9617 9618 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 9619 9620 recomputePadding(); 9621 } 9622 9623 /** 9624 * Return true if layout direction resolution can be done 9625 * 9626 * @hide 9627 */ 9628 protected boolean canResolveLayoutDirection() { 9629 switch (getLayoutDirection()) { 9630 case LAYOUT_DIRECTION_INHERIT: 9631 return (mParent != null); 9632 default: 9633 return true; 9634 } 9635 } 9636 9637 /** 9638 * Reset the resolved layout direction. 9639 * 9640 * Subclasses need to override this method to clear cached information that depends on the 9641 * resolved layout direction, or to inform child views that inherit their layout direction. 9642 * Overrides must also call the superclass implementation at the start of their implementation. 9643 * 9644 * @hide 9645 */ 9646 protected void resetResolvedLayoutDirection() { 9647 // Reset the current View resolution 9648 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED; 9649 } 9650 9651 /** 9652 * Check if a Locale is corresponding to a RTL script. 9653 * 9654 * @param locale Locale to check 9655 * @return true if a Locale is corresponding to a RTL script. 9656 * 9657 * @hide 9658 */ 9659 protected static boolean isLayoutDirectionRtl(Locale locale) { 9660 return (LocaleUtil.TEXT_LAYOUT_DIRECTION_RTL_DO_NOT_USE == 9661 LocaleUtil.getLayoutDirectionFromLocale(locale)); 9662 } 9663 9664 /** 9665 * This is called when the view is detached from a window. At this point it 9666 * no longer has a surface for drawing. 9667 * 9668 * @see #onAttachedToWindow() 9669 */ 9670 protected void onDetachedFromWindow() { 9671 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 9672 9673 removeUnsetPressCallback(); 9674 removeLongPressCallback(); 9675 removePerformClickCallback(); 9676 removeSendViewScrolledAccessibilityEventCallback(); 9677 9678 destroyDrawingCache(); 9679 9680 destroyLayer(); 9681 9682 if (mDisplayList != null) { 9683 mDisplayList.invalidate(); 9684 } 9685 9686 if (mAttachInfo != null) { 9687 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 9688 } 9689 9690 mCurrentAnimation = null; 9691 9692 resetResolvedLayoutDirection(); 9693 resetResolvedTextDirection(); 9694 } 9695 9696 /** 9697 * @return The number of times this view has been attached to a window 9698 */ 9699 protected int getWindowAttachCount() { 9700 return mWindowAttachCount; 9701 } 9702 9703 /** 9704 * Retrieve a unique token identifying the window this view is attached to. 9705 * @return Return the window's token for use in 9706 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 9707 */ 9708 public IBinder getWindowToken() { 9709 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 9710 } 9711 9712 /** 9713 * Retrieve a unique token identifying the top-level "real" window of 9714 * the window that this view is attached to. That is, this is like 9715 * {@link #getWindowToken}, except if the window this view in is a panel 9716 * window (attached to another containing window), then the token of 9717 * the containing window is returned instead. 9718 * 9719 * @return Returns the associated window token, either 9720 * {@link #getWindowToken()} or the containing window's token. 9721 */ 9722 public IBinder getApplicationWindowToken() { 9723 AttachInfo ai = mAttachInfo; 9724 if (ai != null) { 9725 IBinder appWindowToken = ai.mPanelParentWindowToken; 9726 if (appWindowToken == null) { 9727 appWindowToken = ai.mWindowToken; 9728 } 9729 return appWindowToken; 9730 } 9731 return null; 9732 } 9733 9734 /** 9735 * Retrieve private session object this view hierarchy is using to 9736 * communicate with the window manager. 9737 * @return the session object to communicate with the window manager 9738 */ 9739 /*package*/ IWindowSession getWindowSession() { 9740 return mAttachInfo != null ? mAttachInfo.mSession : null; 9741 } 9742 9743 /** 9744 * @param info the {@link android.view.View.AttachInfo} to associated with 9745 * this view 9746 */ 9747 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 9748 //System.out.println("Attached! " + this); 9749 mAttachInfo = info; 9750 mWindowAttachCount++; 9751 // We will need to evaluate the drawable state at least once. 9752 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9753 if (mFloatingTreeObserver != null) { 9754 info.mTreeObserver.merge(mFloatingTreeObserver); 9755 mFloatingTreeObserver = null; 9756 } 9757 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 9758 mAttachInfo.mScrollContainers.add(this); 9759 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 9760 } 9761 performCollectViewAttributes(visibility); 9762 onAttachedToWindow(); 9763 9764 ListenerInfo li = mListenerInfo; 9765 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9766 li != null ? li.mOnAttachStateChangeListeners : null; 9767 if (listeners != null && listeners.size() > 0) { 9768 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9769 // perform the dispatching. The iterator is a safe guard against listeners that 9770 // could mutate the list by calling the various add/remove methods. This prevents 9771 // the array from being modified while we iterate it. 9772 for (OnAttachStateChangeListener listener : listeners) { 9773 listener.onViewAttachedToWindow(this); 9774 } 9775 } 9776 9777 int vis = info.mWindowVisibility; 9778 if (vis != GONE) { 9779 onWindowVisibilityChanged(vis); 9780 } 9781 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 9782 // If nobody has evaluated the drawable state yet, then do it now. 9783 refreshDrawableState(); 9784 } 9785 } 9786 9787 void dispatchDetachedFromWindow() { 9788 AttachInfo info = mAttachInfo; 9789 if (info != null) { 9790 int vis = info.mWindowVisibility; 9791 if (vis != GONE) { 9792 onWindowVisibilityChanged(GONE); 9793 } 9794 } 9795 9796 onDetachedFromWindow(); 9797 9798 ListenerInfo li = mListenerInfo; 9799 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9800 li != null ? li.mOnAttachStateChangeListeners : null; 9801 if (listeners != null && listeners.size() > 0) { 9802 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9803 // perform the dispatching. The iterator is a safe guard against listeners that 9804 // could mutate the list by calling the various add/remove methods. This prevents 9805 // the array from being modified while we iterate it. 9806 for (OnAttachStateChangeListener listener : listeners) { 9807 listener.onViewDetachedFromWindow(this); 9808 } 9809 } 9810 9811 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 9812 mAttachInfo.mScrollContainers.remove(this); 9813 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 9814 } 9815 9816 mAttachInfo = null; 9817 } 9818 9819 /** 9820 * Store this view hierarchy's frozen state into the given container. 9821 * 9822 * @param container The SparseArray in which to save the view's state. 9823 * 9824 * @see #restoreHierarchyState(android.util.SparseArray) 9825 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9826 * @see #onSaveInstanceState() 9827 */ 9828 public void saveHierarchyState(SparseArray<Parcelable> container) { 9829 dispatchSaveInstanceState(container); 9830 } 9831 9832 /** 9833 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 9834 * this view and its children. May be overridden to modify how freezing happens to a 9835 * view's children; for example, some views may want to not store state for their children. 9836 * 9837 * @param container The SparseArray in which to save the view's state. 9838 * 9839 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9840 * @see #saveHierarchyState(android.util.SparseArray) 9841 * @see #onSaveInstanceState() 9842 */ 9843 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 9844 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 9845 mPrivateFlags &= ~SAVE_STATE_CALLED; 9846 Parcelable state = onSaveInstanceState(); 9847 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9848 throw new IllegalStateException( 9849 "Derived class did not call super.onSaveInstanceState()"); 9850 } 9851 if (state != null) { 9852 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 9853 // + ": " + state); 9854 container.put(mID, state); 9855 } 9856 } 9857 } 9858 9859 /** 9860 * Hook allowing a view to generate a representation of its internal state 9861 * that can later be used to create a new instance with that same state. 9862 * This state should only contain information that is not persistent or can 9863 * not be reconstructed later. For example, you will never store your 9864 * current position on screen because that will be computed again when a 9865 * new instance of the view is placed in its view hierarchy. 9866 * <p> 9867 * Some examples of things you may store here: the current cursor position 9868 * in a text view (but usually not the text itself since that is stored in a 9869 * content provider or other persistent storage), the currently selected 9870 * item in a list view. 9871 * 9872 * @return Returns a Parcelable object containing the view's current dynamic 9873 * state, or null if there is nothing interesting to save. The 9874 * default implementation returns null. 9875 * @see #onRestoreInstanceState(android.os.Parcelable) 9876 * @see #saveHierarchyState(android.util.SparseArray) 9877 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9878 * @see #setSaveEnabled(boolean) 9879 */ 9880 protected Parcelable onSaveInstanceState() { 9881 mPrivateFlags |= SAVE_STATE_CALLED; 9882 return BaseSavedState.EMPTY_STATE; 9883 } 9884 9885 /** 9886 * Restore this view hierarchy's frozen state from the given container. 9887 * 9888 * @param container The SparseArray which holds previously frozen states. 9889 * 9890 * @see #saveHierarchyState(android.util.SparseArray) 9891 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9892 * @see #onRestoreInstanceState(android.os.Parcelable) 9893 */ 9894 public void restoreHierarchyState(SparseArray<Parcelable> container) { 9895 dispatchRestoreInstanceState(container); 9896 } 9897 9898 /** 9899 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 9900 * state for this view and its children. May be overridden to modify how restoring 9901 * happens to a view's children; for example, some views may want to not store state 9902 * for their children. 9903 * 9904 * @param container The SparseArray which holds previously saved state. 9905 * 9906 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9907 * @see #restoreHierarchyState(android.util.SparseArray) 9908 * @see #onRestoreInstanceState(android.os.Parcelable) 9909 */ 9910 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 9911 if (mID != NO_ID) { 9912 Parcelable state = container.get(mID); 9913 if (state != null) { 9914 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 9915 // + ": " + state); 9916 mPrivateFlags &= ~SAVE_STATE_CALLED; 9917 onRestoreInstanceState(state); 9918 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9919 throw new IllegalStateException( 9920 "Derived class did not call super.onRestoreInstanceState()"); 9921 } 9922 } 9923 } 9924 } 9925 9926 /** 9927 * Hook allowing a view to re-apply a representation of its internal state that had previously 9928 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 9929 * null state. 9930 * 9931 * @param state The frozen state that had previously been returned by 9932 * {@link #onSaveInstanceState}. 9933 * 9934 * @see #onSaveInstanceState() 9935 * @see #restoreHierarchyState(android.util.SparseArray) 9936 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9937 */ 9938 protected void onRestoreInstanceState(Parcelable state) { 9939 mPrivateFlags |= SAVE_STATE_CALLED; 9940 if (state != BaseSavedState.EMPTY_STATE && state != null) { 9941 throw new IllegalArgumentException("Wrong state class, expecting View State but " 9942 + "received " + state.getClass().toString() + " instead. This usually happens " 9943 + "when two views of different type have the same id in the same hierarchy. " 9944 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 9945 + "other views do not use the same id."); 9946 } 9947 } 9948 9949 /** 9950 * <p>Return the time at which the drawing of the view hierarchy started.</p> 9951 * 9952 * @return the drawing start time in milliseconds 9953 */ 9954 public long getDrawingTime() { 9955 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 9956 } 9957 9958 /** 9959 * <p>Enables or disables the duplication of the parent's state into this view. When 9960 * duplication is enabled, this view gets its drawable state from its parent rather 9961 * than from its own internal properties.</p> 9962 * 9963 * <p>Note: in the current implementation, setting this property to true after the 9964 * view was added to a ViewGroup might have no effect at all. This property should 9965 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 9966 * 9967 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 9968 * property is enabled, an exception will be thrown.</p> 9969 * 9970 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 9971 * parent, these states should not be affected by this method.</p> 9972 * 9973 * @param enabled True to enable duplication of the parent's drawable state, false 9974 * to disable it. 9975 * 9976 * @see #getDrawableState() 9977 * @see #isDuplicateParentStateEnabled() 9978 */ 9979 public void setDuplicateParentStateEnabled(boolean enabled) { 9980 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 9981 } 9982 9983 /** 9984 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 9985 * 9986 * @return True if this view's drawable state is duplicated from the parent, 9987 * false otherwise 9988 * 9989 * @see #getDrawableState() 9990 * @see #setDuplicateParentStateEnabled(boolean) 9991 */ 9992 public boolean isDuplicateParentStateEnabled() { 9993 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 9994 } 9995 9996 /** 9997 * <p>Specifies the type of layer backing this view. The layer can be 9998 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 9999 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 10000 * 10001 * <p>A layer is associated with an optional {@link android.graphics.Paint} 10002 * instance that controls how the layer is composed on screen. The following 10003 * properties of the paint are taken into account when composing the layer:</p> 10004 * <ul> 10005 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 10006 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 10007 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 10008 * </ul> 10009 * 10010 * <p>If this view has an alpha value set to < 1.0 by calling 10011 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 10012 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 10013 * equivalent to setting a hardware layer on this view and providing a paint with 10014 * the desired alpha value.<p> 10015 * 10016 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 10017 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 10018 * for more information on when and how to use layers.</p> 10019 * 10020 * @param layerType The ype of layer to use with this view, must be one of 10021 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 10022 * {@link #LAYER_TYPE_HARDWARE} 10023 * @param paint The paint used to compose the layer. This argument is optional 10024 * and can be null. It is ignored when the layer type is 10025 * {@link #LAYER_TYPE_NONE} 10026 * 10027 * @see #getLayerType() 10028 * @see #LAYER_TYPE_NONE 10029 * @see #LAYER_TYPE_SOFTWARE 10030 * @see #LAYER_TYPE_HARDWARE 10031 * @see #setAlpha(float) 10032 * 10033 * @attr ref android.R.styleable#View_layerType 10034 */ 10035 public void setLayerType(int layerType, Paint paint) { 10036 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 10037 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 10038 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 10039 } 10040 10041 if (layerType == mLayerType) { 10042 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 10043 mLayerPaint = paint == null ? new Paint() : paint; 10044 invalidateParentCaches(); 10045 invalidate(true); 10046 } 10047 return; 10048 } 10049 10050 // Destroy any previous software drawing cache if needed 10051 switch (mLayerType) { 10052 case LAYER_TYPE_HARDWARE: 10053 destroyLayer(); 10054 // fall through - non-accelerated views may use software layer mechanism instead 10055 case LAYER_TYPE_SOFTWARE: 10056 destroyDrawingCache(); 10057 break; 10058 default: 10059 break; 10060 } 10061 10062 mLayerType = layerType; 10063 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 10064 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 10065 mLocalDirtyRect = layerDisabled ? null : new Rect(); 10066 10067 invalidateParentCaches(); 10068 invalidate(true); 10069 } 10070 10071 /** 10072 * Indicates whether this view has a static layer. A view with layer type 10073 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 10074 * dynamic. 10075 */ 10076 boolean hasStaticLayer() { 10077 return mLayerType == LAYER_TYPE_NONE; 10078 } 10079 10080 /** 10081 * Indicates what type of layer is currently associated with this view. By default 10082 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 10083 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 10084 * for more information on the different types of layers. 10085 * 10086 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 10087 * {@link #LAYER_TYPE_HARDWARE} 10088 * 10089 * @see #setLayerType(int, android.graphics.Paint) 10090 * @see #buildLayer() 10091 * @see #LAYER_TYPE_NONE 10092 * @see #LAYER_TYPE_SOFTWARE 10093 * @see #LAYER_TYPE_HARDWARE 10094 */ 10095 public int getLayerType() { 10096 return mLayerType; 10097 } 10098 10099 /** 10100 * Forces this view's layer to be created and this view to be rendered 10101 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 10102 * invoking this method will have no effect. 10103 * 10104 * This method can for instance be used to render a view into its layer before 10105 * starting an animation. If this view is complex, rendering into the layer 10106 * before starting the animation will avoid skipping frames. 10107 * 10108 * @throws IllegalStateException If this view is not attached to a window 10109 * 10110 * @see #setLayerType(int, android.graphics.Paint) 10111 */ 10112 public void buildLayer() { 10113 if (mLayerType == LAYER_TYPE_NONE) return; 10114 10115 if (mAttachInfo == null) { 10116 throw new IllegalStateException("This view must be attached to a window first"); 10117 } 10118 10119 switch (mLayerType) { 10120 case LAYER_TYPE_HARDWARE: 10121 if (mAttachInfo.mHardwareRenderer != null && 10122 mAttachInfo.mHardwareRenderer.isEnabled() && 10123 mAttachInfo.mHardwareRenderer.validate()) { 10124 getHardwareLayer(); 10125 } 10126 break; 10127 case LAYER_TYPE_SOFTWARE: 10128 buildDrawingCache(true); 10129 break; 10130 } 10131 } 10132 10133 // Make sure the HardwareRenderer.validate() was invoked before calling this method 10134 void flushLayer() { 10135 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 10136 mHardwareLayer.flush(); 10137 } 10138 } 10139 10140 /** 10141 * <p>Returns a hardware layer that can be used to draw this view again 10142 * without executing its draw method.</p> 10143 * 10144 * @return A HardwareLayer ready to render, or null if an error occurred. 10145 */ 10146 HardwareLayer getHardwareLayer() { 10147 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 10148 !mAttachInfo.mHardwareRenderer.isEnabled()) { 10149 return null; 10150 } 10151 10152 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 10153 10154 final int width = mRight - mLeft; 10155 final int height = mBottom - mTop; 10156 10157 if (width == 0 || height == 0) { 10158 return null; 10159 } 10160 10161 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 10162 if (mHardwareLayer == null) { 10163 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 10164 width, height, isOpaque()); 10165 mLocalDirtyRect.setEmpty(); 10166 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 10167 mHardwareLayer.resize(width, height); 10168 mLocalDirtyRect.setEmpty(); 10169 } 10170 10171 // The layer is not valid if the underlying GPU resources cannot be allocated 10172 if (!mHardwareLayer.isValid()) { 10173 return null; 10174 } 10175 10176 HardwareCanvas currentCanvas = mAttachInfo.mHardwareCanvas; 10177 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 10178 10179 // Make sure all the GPU resources have been properly allocated 10180 if (canvas == null) { 10181 mHardwareLayer.end(currentCanvas); 10182 return null; 10183 } 10184 10185 mAttachInfo.mHardwareCanvas = canvas; 10186 try { 10187 canvas.setViewport(width, height); 10188 canvas.onPreDraw(mLocalDirtyRect); 10189 mLocalDirtyRect.setEmpty(); 10190 10191 final int restoreCount = canvas.save(); 10192 10193 computeScroll(); 10194 canvas.translate(-mScrollX, -mScrollY); 10195 10196 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10197 10198 // Fast path for layouts with no backgrounds 10199 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10200 mPrivateFlags &= ~DIRTY_MASK; 10201 dispatchDraw(canvas); 10202 } else { 10203 draw(canvas); 10204 } 10205 10206 canvas.restoreToCount(restoreCount); 10207 } finally { 10208 canvas.onPostDraw(); 10209 mHardwareLayer.end(currentCanvas); 10210 mAttachInfo.mHardwareCanvas = currentCanvas; 10211 } 10212 } 10213 10214 return mHardwareLayer; 10215 } 10216 10217 /** 10218 * Destroys this View's hardware layer if possible. 10219 * 10220 * @return True if the layer was destroyed, false otherwise. 10221 * 10222 * @see #setLayerType(int, android.graphics.Paint) 10223 * @see #LAYER_TYPE_HARDWARE 10224 */ 10225 boolean destroyLayer() { 10226 if (mHardwareLayer != null) { 10227 AttachInfo info = mAttachInfo; 10228 if (info != null && info.mHardwareRenderer != null && 10229 info.mHardwareRenderer.isEnabled() && info.mHardwareRenderer.validate()) { 10230 mHardwareLayer.destroy(); 10231 mHardwareLayer = null; 10232 10233 invalidate(true); 10234 invalidateParentCaches(); 10235 } 10236 return true; 10237 } 10238 return false; 10239 } 10240 10241 /** 10242 * Destroys all hardware rendering resources. This method is invoked 10243 * when the system needs to reclaim resources. Upon execution of this 10244 * method, you should free any OpenGL resources created by the view. 10245 * 10246 * Note: you <strong>must</strong> call 10247 * <code>super.destroyHardwareResources()</code> when overriding 10248 * this method. 10249 * 10250 * @hide 10251 */ 10252 protected void destroyHardwareResources() { 10253 destroyLayer(); 10254 } 10255 10256 /** 10257 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 10258 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 10259 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 10260 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 10261 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 10262 * null.</p> 10263 * 10264 * <p>Enabling the drawing cache is similar to 10265 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 10266 * acceleration is turned off. When hardware acceleration is turned on, enabling the 10267 * drawing cache has no effect on rendering because the system uses a different mechanism 10268 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 10269 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 10270 * for information on how to enable software and hardware layers.</p> 10271 * 10272 * <p>This API can be used to manually generate 10273 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 10274 * {@link #getDrawingCache()}.</p> 10275 * 10276 * @param enabled true to enable the drawing cache, false otherwise 10277 * 10278 * @see #isDrawingCacheEnabled() 10279 * @see #getDrawingCache() 10280 * @see #buildDrawingCache() 10281 * @see #setLayerType(int, android.graphics.Paint) 10282 */ 10283 public void setDrawingCacheEnabled(boolean enabled) { 10284 mCachingFailed = false; 10285 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 10286 } 10287 10288 /** 10289 * <p>Indicates whether the drawing cache is enabled for this view.</p> 10290 * 10291 * @return true if the drawing cache is enabled 10292 * 10293 * @see #setDrawingCacheEnabled(boolean) 10294 * @see #getDrawingCache() 10295 */ 10296 @ViewDebug.ExportedProperty(category = "drawing") 10297 public boolean isDrawingCacheEnabled() { 10298 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 10299 } 10300 10301 /** 10302 * Debugging utility which recursively outputs the dirty state of a view and its 10303 * descendants. 10304 * 10305 * @hide 10306 */ 10307 @SuppressWarnings({"UnusedDeclaration"}) 10308 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 10309 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 10310 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 10311 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 10312 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 10313 if (clear) { 10314 mPrivateFlags &= clearMask; 10315 } 10316 if (this instanceof ViewGroup) { 10317 ViewGroup parent = (ViewGroup) this; 10318 final int count = parent.getChildCount(); 10319 for (int i = 0; i < count; i++) { 10320 final View child = parent.getChildAt(i); 10321 child.outputDirtyFlags(indent + " ", clear, clearMask); 10322 } 10323 } 10324 } 10325 10326 /** 10327 * This method is used by ViewGroup to cause its children to restore or recreate their 10328 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 10329 * to recreate its own display list, which would happen if it went through the normal 10330 * draw/dispatchDraw mechanisms. 10331 * 10332 * @hide 10333 */ 10334 protected void dispatchGetDisplayList() {} 10335 10336 /** 10337 * A view that is not attached or hardware accelerated cannot create a display list. 10338 * This method checks these conditions and returns the appropriate result. 10339 * 10340 * @return true if view has the ability to create a display list, false otherwise. 10341 * 10342 * @hide 10343 */ 10344 public boolean canHaveDisplayList() { 10345 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 10346 } 10347 10348 /** 10349 * @return The HardwareRenderer associated with that view or null if hardware rendering 10350 * is not supported or this this has not been attached to a window. 10351 * 10352 * @hide 10353 */ 10354 public HardwareRenderer getHardwareRenderer() { 10355 if (mAttachInfo != null) { 10356 return mAttachInfo.mHardwareRenderer; 10357 } 10358 return null; 10359 } 10360 10361 /** 10362 * <p>Returns a display list that can be used to draw this view again 10363 * without executing its draw method.</p> 10364 * 10365 * @return A DisplayList ready to replay, or null if caching is not enabled. 10366 * 10367 * @hide 10368 */ 10369 public DisplayList getDisplayList() { 10370 if (!canHaveDisplayList()) { 10371 return null; 10372 } 10373 10374 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 10375 mDisplayList == null || !mDisplayList.isValid() || 10376 mRecreateDisplayList)) { 10377 // Don't need to recreate the display list, just need to tell our 10378 // children to restore/recreate theirs 10379 if (mDisplayList != null && mDisplayList.isValid() && 10380 !mRecreateDisplayList) { 10381 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10382 mPrivateFlags &= ~DIRTY_MASK; 10383 dispatchGetDisplayList(); 10384 10385 return mDisplayList; 10386 } 10387 10388 // If we got here, we're recreating it. Mark it as such to ensure that 10389 // we copy in child display lists into ours in drawChild() 10390 mRecreateDisplayList = true; 10391 if (mDisplayList == null) { 10392 final String name = getClass().getSimpleName(); 10393 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 10394 // If we're creating a new display list, make sure our parent gets invalidated 10395 // since they will need to recreate their display list to account for this 10396 // new child display list. 10397 invalidateParentCaches(); 10398 } 10399 10400 final HardwareCanvas canvas = mDisplayList.start(); 10401 int restoreCount = 0; 10402 try { 10403 int width = mRight - mLeft; 10404 int height = mBottom - mTop; 10405 10406 canvas.setViewport(width, height); 10407 // The dirty rect should always be null for a display list 10408 canvas.onPreDraw(null); 10409 10410 computeScroll(); 10411 10412 restoreCount = canvas.save(); 10413 canvas.translate(-mScrollX, -mScrollY); 10414 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10415 mPrivateFlags &= ~DIRTY_MASK; 10416 10417 // Fast path for layouts with no backgrounds 10418 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10419 dispatchDraw(canvas); 10420 } else { 10421 draw(canvas); 10422 } 10423 } finally { 10424 canvas.restoreToCount(restoreCount); 10425 canvas.onPostDraw(); 10426 10427 mDisplayList.end(); 10428 } 10429 } else { 10430 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10431 mPrivateFlags &= ~DIRTY_MASK; 10432 } 10433 10434 return mDisplayList; 10435 } 10436 10437 /** 10438 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 10439 * 10440 * @return A non-scaled bitmap representing this view or null if cache is disabled. 10441 * 10442 * @see #getDrawingCache(boolean) 10443 */ 10444 public Bitmap getDrawingCache() { 10445 return getDrawingCache(false); 10446 } 10447 10448 /** 10449 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 10450 * is null when caching is disabled. If caching is enabled and the cache is not ready, 10451 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 10452 * draw from the cache when the cache is enabled. To benefit from the cache, you must 10453 * request the drawing cache by calling this method and draw it on screen if the 10454 * returned bitmap is not null.</p> 10455 * 10456 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10457 * this method will create a bitmap of the same size as this view. Because this bitmap 10458 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10459 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10460 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10461 * size than the view. This implies that your application must be able to handle this 10462 * size.</p> 10463 * 10464 * @param autoScale Indicates whether the generated bitmap should be scaled based on 10465 * the current density of the screen when the application is in compatibility 10466 * mode. 10467 * 10468 * @return A bitmap representing this view or null if cache is disabled. 10469 * 10470 * @see #setDrawingCacheEnabled(boolean) 10471 * @see #isDrawingCacheEnabled() 10472 * @see #buildDrawingCache(boolean) 10473 * @see #destroyDrawingCache() 10474 */ 10475 public Bitmap getDrawingCache(boolean autoScale) { 10476 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 10477 return null; 10478 } 10479 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 10480 buildDrawingCache(autoScale); 10481 } 10482 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 10483 } 10484 10485 /** 10486 * <p>Frees the resources used by the drawing cache. If you call 10487 * {@link #buildDrawingCache()} manually without calling 10488 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10489 * should cleanup the cache with this method afterwards.</p> 10490 * 10491 * @see #setDrawingCacheEnabled(boolean) 10492 * @see #buildDrawingCache() 10493 * @see #getDrawingCache() 10494 */ 10495 public void destroyDrawingCache() { 10496 if (mDrawingCache != null) { 10497 mDrawingCache.recycle(); 10498 mDrawingCache = null; 10499 } 10500 if (mUnscaledDrawingCache != null) { 10501 mUnscaledDrawingCache.recycle(); 10502 mUnscaledDrawingCache = null; 10503 } 10504 } 10505 10506 /** 10507 * Setting a solid background color for the drawing cache's bitmaps will improve 10508 * performance and memory usage. Note, though that this should only be used if this 10509 * view will always be drawn on top of a solid color. 10510 * 10511 * @param color The background color to use for the drawing cache's bitmap 10512 * 10513 * @see #setDrawingCacheEnabled(boolean) 10514 * @see #buildDrawingCache() 10515 * @see #getDrawingCache() 10516 */ 10517 public void setDrawingCacheBackgroundColor(int color) { 10518 if (color != mDrawingCacheBackgroundColor) { 10519 mDrawingCacheBackgroundColor = color; 10520 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10521 } 10522 } 10523 10524 /** 10525 * @see #setDrawingCacheBackgroundColor(int) 10526 * 10527 * @return The background color to used for the drawing cache's bitmap 10528 */ 10529 public int getDrawingCacheBackgroundColor() { 10530 return mDrawingCacheBackgroundColor; 10531 } 10532 10533 /** 10534 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 10535 * 10536 * @see #buildDrawingCache(boolean) 10537 */ 10538 public void buildDrawingCache() { 10539 buildDrawingCache(false); 10540 } 10541 10542 /** 10543 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 10544 * 10545 * <p>If you call {@link #buildDrawingCache()} manually without calling 10546 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10547 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 10548 * 10549 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10550 * this method will create a bitmap of the same size as this view. Because this bitmap 10551 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10552 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10553 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10554 * size than the view. This implies that your application must be able to handle this 10555 * size.</p> 10556 * 10557 * <p>You should avoid calling this method when hardware acceleration is enabled. If 10558 * you do not need the drawing cache bitmap, calling this method will increase memory 10559 * usage and cause the view to be rendered in software once, thus negatively impacting 10560 * performance.</p> 10561 * 10562 * @see #getDrawingCache() 10563 * @see #destroyDrawingCache() 10564 */ 10565 public void buildDrawingCache(boolean autoScale) { 10566 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 10567 mDrawingCache == null : mUnscaledDrawingCache == null)) { 10568 mCachingFailed = false; 10569 10570 if (ViewDebug.TRACE_HIERARCHY) { 10571 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 10572 } 10573 10574 int width = mRight - mLeft; 10575 int height = mBottom - mTop; 10576 10577 final AttachInfo attachInfo = mAttachInfo; 10578 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 10579 10580 if (autoScale && scalingRequired) { 10581 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 10582 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 10583 } 10584 10585 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 10586 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 10587 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 10588 10589 if (width <= 0 || height <= 0 || 10590 // Projected bitmap size in bytes 10591 (width * height * (opaque && !use32BitCache ? 2 : 4) > 10592 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 10593 destroyDrawingCache(); 10594 mCachingFailed = true; 10595 return; 10596 } 10597 10598 boolean clear = true; 10599 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 10600 10601 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 10602 Bitmap.Config quality; 10603 if (!opaque) { 10604 // Never pick ARGB_4444 because it looks awful 10605 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 10606 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 10607 case DRAWING_CACHE_QUALITY_AUTO: 10608 quality = Bitmap.Config.ARGB_8888; 10609 break; 10610 case DRAWING_CACHE_QUALITY_LOW: 10611 quality = Bitmap.Config.ARGB_8888; 10612 break; 10613 case DRAWING_CACHE_QUALITY_HIGH: 10614 quality = Bitmap.Config.ARGB_8888; 10615 break; 10616 default: 10617 quality = Bitmap.Config.ARGB_8888; 10618 break; 10619 } 10620 } else { 10621 // Optimization for translucent windows 10622 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 10623 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 10624 } 10625 10626 // Try to cleanup memory 10627 if (bitmap != null) bitmap.recycle(); 10628 10629 try { 10630 bitmap = Bitmap.createBitmap(width, height, quality); 10631 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 10632 if (autoScale) { 10633 mDrawingCache = bitmap; 10634 } else { 10635 mUnscaledDrawingCache = bitmap; 10636 } 10637 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 10638 } catch (OutOfMemoryError e) { 10639 // If there is not enough memory to create the bitmap cache, just 10640 // ignore the issue as bitmap caches are not required to draw the 10641 // view hierarchy 10642 if (autoScale) { 10643 mDrawingCache = null; 10644 } else { 10645 mUnscaledDrawingCache = null; 10646 } 10647 mCachingFailed = true; 10648 return; 10649 } 10650 10651 clear = drawingCacheBackgroundColor != 0; 10652 } 10653 10654 Canvas canvas; 10655 if (attachInfo != null) { 10656 canvas = attachInfo.mCanvas; 10657 if (canvas == null) { 10658 canvas = new Canvas(); 10659 } 10660 canvas.setBitmap(bitmap); 10661 // Temporarily clobber the cached Canvas in case one of our children 10662 // is also using a drawing cache. Without this, the children would 10663 // steal the canvas by attaching their own bitmap to it and bad, bad 10664 // thing would happen (invisible views, corrupted drawings, etc.) 10665 attachInfo.mCanvas = null; 10666 } else { 10667 // This case should hopefully never or seldom happen 10668 canvas = new Canvas(bitmap); 10669 } 10670 10671 if (clear) { 10672 bitmap.eraseColor(drawingCacheBackgroundColor); 10673 } 10674 10675 computeScroll(); 10676 final int restoreCount = canvas.save(); 10677 10678 if (autoScale && scalingRequired) { 10679 final float scale = attachInfo.mApplicationScale; 10680 canvas.scale(scale, scale); 10681 } 10682 10683 canvas.translate(-mScrollX, -mScrollY); 10684 10685 mPrivateFlags |= DRAWN; 10686 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 10687 mLayerType != LAYER_TYPE_NONE) { 10688 mPrivateFlags |= DRAWING_CACHE_VALID; 10689 } 10690 10691 // Fast path for layouts with no backgrounds 10692 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10693 if (ViewDebug.TRACE_HIERARCHY) { 10694 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10695 } 10696 mPrivateFlags &= ~DIRTY_MASK; 10697 dispatchDraw(canvas); 10698 } else { 10699 draw(canvas); 10700 } 10701 10702 canvas.restoreToCount(restoreCount); 10703 canvas.setBitmap(null); 10704 10705 if (attachInfo != null) { 10706 // Restore the cached Canvas for our siblings 10707 attachInfo.mCanvas = canvas; 10708 } 10709 } 10710 } 10711 10712 /** 10713 * Create a snapshot of the view into a bitmap. We should probably make 10714 * some form of this public, but should think about the API. 10715 */ 10716 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 10717 int width = mRight - mLeft; 10718 int height = mBottom - mTop; 10719 10720 final AttachInfo attachInfo = mAttachInfo; 10721 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 10722 width = (int) ((width * scale) + 0.5f); 10723 height = (int) ((height * scale) + 0.5f); 10724 10725 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 10726 if (bitmap == null) { 10727 throw new OutOfMemoryError(); 10728 } 10729 10730 Resources resources = getResources(); 10731 if (resources != null) { 10732 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 10733 } 10734 10735 Canvas canvas; 10736 if (attachInfo != null) { 10737 canvas = attachInfo.mCanvas; 10738 if (canvas == null) { 10739 canvas = new Canvas(); 10740 } 10741 canvas.setBitmap(bitmap); 10742 // Temporarily clobber the cached Canvas in case one of our children 10743 // is also using a drawing cache. Without this, the children would 10744 // steal the canvas by attaching their own bitmap to it and bad, bad 10745 // things would happen (invisible views, corrupted drawings, etc.) 10746 attachInfo.mCanvas = null; 10747 } else { 10748 // This case should hopefully never or seldom happen 10749 canvas = new Canvas(bitmap); 10750 } 10751 10752 if ((backgroundColor & 0xff000000) != 0) { 10753 bitmap.eraseColor(backgroundColor); 10754 } 10755 10756 computeScroll(); 10757 final int restoreCount = canvas.save(); 10758 canvas.scale(scale, scale); 10759 canvas.translate(-mScrollX, -mScrollY); 10760 10761 // Temporarily remove the dirty mask 10762 int flags = mPrivateFlags; 10763 mPrivateFlags &= ~DIRTY_MASK; 10764 10765 // Fast path for layouts with no backgrounds 10766 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10767 dispatchDraw(canvas); 10768 } else { 10769 draw(canvas); 10770 } 10771 10772 mPrivateFlags = flags; 10773 10774 canvas.restoreToCount(restoreCount); 10775 canvas.setBitmap(null); 10776 10777 if (attachInfo != null) { 10778 // Restore the cached Canvas for our siblings 10779 attachInfo.mCanvas = canvas; 10780 } 10781 10782 return bitmap; 10783 } 10784 10785 /** 10786 * Indicates whether this View is currently in edit mode. A View is usually 10787 * in edit mode when displayed within a developer tool. For instance, if 10788 * this View is being drawn by a visual user interface builder, this method 10789 * should return true. 10790 * 10791 * Subclasses should check the return value of this method to provide 10792 * different behaviors if their normal behavior might interfere with the 10793 * host environment. For instance: the class spawns a thread in its 10794 * constructor, the drawing code relies on device-specific features, etc. 10795 * 10796 * This method is usually checked in the drawing code of custom widgets. 10797 * 10798 * @return True if this View is in edit mode, false otherwise. 10799 */ 10800 public boolean isInEditMode() { 10801 return false; 10802 } 10803 10804 /** 10805 * If the View draws content inside its padding and enables fading edges, 10806 * it needs to support padding offsets. Padding offsets are added to the 10807 * fading edges to extend the length of the fade so that it covers pixels 10808 * drawn inside the padding. 10809 * 10810 * Subclasses of this class should override this method if they need 10811 * to draw content inside the padding. 10812 * 10813 * @return True if padding offset must be applied, false otherwise. 10814 * 10815 * @see #getLeftPaddingOffset() 10816 * @see #getRightPaddingOffset() 10817 * @see #getTopPaddingOffset() 10818 * @see #getBottomPaddingOffset() 10819 * 10820 * @since CURRENT 10821 */ 10822 protected boolean isPaddingOffsetRequired() { 10823 return false; 10824 } 10825 10826 /** 10827 * Amount by which to extend the left fading region. Called only when 10828 * {@link #isPaddingOffsetRequired()} returns true. 10829 * 10830 * @return The left padding offset in pixels. 10831 * 10832 * @see #isPaddingOffsetRequired() 10833 * 10834 * @since CURRENT 10835 */ 10836 protected int getLeftPaddingOffset() { 10837 return 0; 10838 } 10839 10840 /** 10841 * Amount by which to extend the right fading region. Called only when 10842 * {@link #isPaddingOffsetRequired()} returns true. 10843 * 10844 * @return The right padding offset in pixels. 10845 * 10846 * @see #isPaddingOffsetRequired() 10847 * 10848 * @since CURRENT 10849 */ 10850 protected int getRightPaddingOffset() { 10851 return 0; 10852 } 10853 10854 /** 10855 * Amount by which to extend the top fading region. Called only when 10856 * {@link #isPaddingOffsetRequired()} returns true. 10857 * 10858 * @return The top padding offset in pixels. 10859 * 10860 * @see #isPaddingOffsetRequired() 10861 * 10862 * @since CURRENT 10863 */ 10864 protected int getTopPaddingOffset() { 10865 return 0; 10866 } 10867 10868 /** 10869 * Amount by which to extend the bottom fading region. Called only when 10870 * {@link #isPaddingOffsetRequired()} returns true. 10871 * 10872 * @return The bottom padding offset in pixels. 10873 * 10874 * @see #isPaddingOffsetRequired() 10875 * 10876 * @since CURRENT 10877 */ 10878 protected int getBottomPaddingOffset() { 10879 return 0; 10880 } 10881 10882 /** 10883 * @hide 10884 * @param offsetRequired 10885 */ 10886 protected int getFadeTop(boolean offsetRequired) { 10887 int top = mPaddingTop; 10888 if (offsetRequired) top += getTopPaddingOffset(); 10889 return top; 10890 } 10891 10892 /** 10893 * @hide 10894 * @param offsetRequired 10895 */ 10896 protected int getFadeHeight(boolean offsetRequired) { 10897 int padding = mPaddingTop; 10898 if (offsetRequired) padding += getTopPaddingOffset(); 10899 return mBottom - mTop - mPaddingBottom - padding; 10900 } 10901 10902 /** 10903 * <p>Indicates whether this view is attached to an hardware accelerated 10904 * window or not.</p> 10905 * 10906 * <p>Even if this method returns true, it does not mean that every call 10907 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 10908 * accelerated {@link android.graphics.Canvas}. For instance, if this view 10909 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 10910 * window is hardware accelerated, 10911 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 10912 * return false, and this method will return true.</p> 10913 * 10914 * @return True if the view is attached to a window and the window is 10915 * hardware accelerated; false in any other case. 10916 */ 10917 public boolean isHardwareAccelerated() { 10918 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 10919 } 10920 10921 /** 10922 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 10923 * case of an active Animation being run on the view. 10924 */ 10925 private boolean drawAnimation(ViewGroup parent, long drawingTime, 10926 Animation a, boolean scalingRequired) { 10927 Transformation invalidationTransform; 10928 final int flags = parent.mGroupFlags; 10929 final boolean initialized = a.isInitialized(); 10930 if (!initialized) { 10931 a.initialize(mRight - mLeft, mBottom - mTop, getWidth(), getHeight()); 10932 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 10933 onAnimationStart(); 10934 } 10935 10936 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 10937 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 10938 if (parent.mInvalidationTransformation == null) { 10939 parent.mInvalidationTransformation = new Transformation(); 10940 } 10941 invalidationTransform = parent.mInvalidationTransformation; 10942 a.getTransformation(drawingTime, invalidationTransform, 1f); 10943 } else { 10944 invalidationTransform = parent.mChildTransformation; 10945 } 10946 if (more) { 10947 if (!a.willChangeBounds()) { 10948 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 10949 parent.FLAG_OPTIMIZE_INVALIDATE) { 10950 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 10951 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 10952 // The child need to draw an animation, potentially offscreen, so 10953 // make sure we do not cancel invalidate requests 10954 parent.mPrivateFlags |= DRAW_ANIMATION; 10955 parent.invalidate(mLeft, mTop, mRight, mBottom); 10956 } 10957 } else { 10958 if (parent.mInvalidateRegion == null) { 10959 parent.mInvalidateRegion = new RectF(); 10960 } 10961 final RectF region = parent.mInvalidateRegion; 10962 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 10963 invalidationTransform); 10964 10965 // The child need to draw an animation, potentially offscreen, so 10966 // make sure we do not cancel invalidate requests 10967 parent.mPrivateFlags |= DRAW_ANIMATION; 10968 10969 final int left = mLeft + (int) region.left; 10970 final int top = mTop + (int) region.top; 10971 parent.invalidate(left, top, left + (int) (region.width() + .5f), 10972 top + (int) (region.height() + .5f)); 10973 } 10974 } 10975 return more; 10976 } 10977 10978 /** 10979 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 10980 * This draw() method is an implementation detail and is not intended to be overridden or 10981 * to be called from anywhere else other than ViewGroup.drawChild(). 10982 */ 10983 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 10984 boolean more = false; 10985 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 10986 final int flags = parent.mGroupFlags; 10987 10988 if ((flags & parent.FLAG_CLEAR_TRANSFORMATION) == parent.FLAG_CLEAR_TRANSFORMATION) { 10989 parent.mChildTransformation.clear(); 10990 parent.mGroupFlags &= ~parent.FLAG_CLEAR_TRANSFORMATION; 10991 } 10992 10993 Transformation transformToApply = null; 10994 boolean concatMatrix = false; 10995 10996 boolean scalingRequired = false; 10997 boolean caching; 10998 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 10999 11000 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 11001 if ((flags & parent.FLAG_CHILDREN_DRAWN_WITH_CACHE) == parent.FLAG_CHILDREN_DRAWN_WITH_CACHE || 11002 (flags & parent.FLAG_ALWAYS_DRAWN_WITH_CACHE) == parent.FLAG_ALWAYS_DRAWN_WITH_CACHE) { 11003 caching = true; 11004 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 11005 } else { 11006 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 11007 } 11008 11009 final Animation a = getAnimation(); 11010 if (a != null) { 11011 more = drawAnimation(parent, drawingTime, a, scalingRequired); 11012 concatMatrix = a.willChangeTransformationMatrix(); 11013 transformToApply = parent.mChildTransformation; 11014 } else if ((flags & parent.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 11015 parent.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 11016 final boolean hasTransform = 11017 parent.getChildStaticTransformation(this, parent.mChildTransformation); 11018 if (hasTransform) { 11019 final int transformType = parent.mChildTransformation.getTransformationType(); 11020 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 11021 parent.mChildTransformation : null; 11022 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 11023 } 11024 } 11025 11026 concatMatrix |= !childHasIdentityMatrix; 11027 11028 // Sets the flag as early as possible to allow draw() implementations 11029 // to call invalidate() successfully when doing animations 11030 mPrivateFlags |= DRAWN; 11031 11032 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 11033 (mPrivateFlags & DRAW_ANIMATION) == 0) { 11034 return more; 11035 } 11036 11037 if (hardwareAccelerated) { 11038 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 11039 // retain the flag's value temporarily in the mRecreateDisplayList flag 11040 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 11041 mPrivateFlags &= ~INVALIDATED; 11042 } 11043 11044 computeScroll(); 11045 11046 final int sx = mScrollX; 11047 final int sy = mScrollY; 11048 11049 DisplayList displayList = null; 11050 Bitmap cache = null; 11051 boolean hasDisplayList = false; 11052 if (caching) { 11053 if (!hardwareAccelerated) { 11054 if (layerType != LAYER_TYPE_NONE) { 11055 layerType = LAYER_TYPE_SOFTWARE; 11056 buildDrawingCache(true); 11057 } 11058 cache = getDrawingCache(true); 11059 } else { 11060 switch (layerType) { 11061 case LAYER_TYPE_SOFTWARE: 11062 buildDrawingCache(true); 11063 cache = getDrawingCache(true); 11064 break; 11065 case LAYER_TYPE_NONE: 11066 // Delay getting the display list until animation-driven alpha values are 11067 // set up and possibly passed on to the view 11068 hasDisplayList = canHaveDisplayList(); 11069 break; 11070 } 11071 } 11072 } 11073 11074 final boolean hasNoCache = cache == null || hasDisplayList; 11075 final boolean offsetForScroll = cache == null && !hasDisplayList && 11076 layerType != LAYER_TYPE_HARDWARE; 11077 11078 final int restoreTo = canvas.save(); 11079 if (offsetForScroll) { 11080 canvas.translate(mLeft - sx, mTop - sy); 11081 } else { 11082 canvas.translate(mLeft, mTop); 11083 if (scalingRequired) { 11084 // mAttachInfo cannot be null, otherwise scalingRequired == false 11085 final float scale = 1.0f / mAttachInfo.mApplicationScale; 11086 canvas.scale(scale, scale); 11087 } 11088 } 11089 11090 float alpha = getAlpha(); 11091 if (transformToApply != null || alpha < 1.0f || !hasIdentityMatrix()) { 11092 if (transformToApply != null || !childHasIdentityMatrix) { 11093 int transX = 0; 11094 int transY = 0; 11095 11096 if (offsetForScroll) { 11097 transX = -sx; 11098 transY = -sy; 11099 } 11100 11101 if (transformToApply != null) { 11102 if (concatMatrix) { 11103 // Undo the scroll translation, apply the transformation matrix, 11104 // then redo the scroll translate to get the correct result. 11105 canvas.translate(-transX, -transY); 11106 canvas.concat(transformToApply.getMatrix()); 11107 canvas.translate(transX, transY); 11108 parent.mGroupFlags |= parent.FLAG_CLEAR_TRANSFORMATION; 11109 } 11110 11111 float transformAlpha = transformToApply.getAlpha(); 11112 if (transformAlpha < 1.0f) { 11113 alpha *= transformToApply.getAlpha(); 11114 parent.mGroupFlags |= parent.FLAG_CLEAR_TRANSFORMATION; 11115 } 11116 } 11117 11118 if (!childHasIdentityMatrix) { 11119 canvas.translate(-transX, -transY); 11120 canvas.concat(getMatrix()); 11121 canvas.translate(transX, transY); 11122 } 11123 } 11124 11125 if (alpha < 1.0f) { 11126 parent.mGroupFlags |= parent.FLAG_CLEAR_TRANSFORMATION; 11127 if (hasNoCache) { 11128 final int multipliedAlpha = (int) (255 * alpha); 11129 if (!onSetAlpha(multipliedAlpha)) { 11130 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 11131 if ((flags & parent.FLAG_CLIP_CHILDREN) == parent.FLAG_CLIP_CHILDREN || 11132 layerType != LAYER_TYPE_NONE) { 11133 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 11134 } 11135 if (layerType == LAYER_TYPE_NONE) { 11136 final int scrollX = hasDisplayList ? 0 : sx; 11137 final int scrollY = hasDisplayList ? 0 : sy; 11138 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 11139 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 11140 } 11141 } else { 11142 // Alpha is handled by the child directly, clobber the layer's alpha 11143 mPrivateFlags |= ALPHA_SET; 11144 } 11145 } 11146 } 11147 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 11148 onSetAlpha(255); 11149 mPrivateFlags &= ~ALPHA_SET; 11150 } 11151 11152 if ((flags & parent.FLAG_CLIP_CHILDREN) == parent.FLAG_CLIP_CHILDREN) { 11153 if (offsetForScroll) { 11154 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 11155 } else { 11156 if (!scalingRequired || cache == null) { 11157 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 11158 } else { 11159 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 11160 } 11161 } 11162 } 11163 11164 if (hasDisplayList) { 11165 displayList = getDisplayList(); 11166 if (!displayList.isValid()) { 11167 // Uncommon, but possible. If a view is removed from the hierarchy during the call 11168 // to getDisplayList(), the display list will be marked invalid and we should not 11169 // try to use it again. 11170 displayList = null; 11171 hasDisplayList = false; 11172 } 11173 } 11174 11175 if (hasNoCache) { 11176 boolean layerRendered = false; 11177 if (layerType == LAYER_TYPE_HARDWARE) { 11178 final HardwareLayer layer = getHardwareLayer(); 11179 if (layer != null && layer.isValid()) { 11180 mLayerPaint.setAlpha((int) (alpha * 255)); 11181 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 11182 layerRendered = true; 11183 } else { 11184 final int scrollX = hasDisplayList ? 0 : sx; 11185 final int scrollY = hasDisplayList ? 0 : sy; 11186 canvas.saveLayer(scrollX, scrollY, 11187 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 11188 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 11189 } 11190 } 11191 11192 if (!layerRendered) { 11193 if (!hasDisplayList) { 11194 // Fast path for layouts with no backgrounds 11195 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 11196 if (ViewDebug.TRACE_HIERARCHY) { 11197 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 11198 } 11199 mPrivateFlags &= ~DIRTY_MASK; 11200 dispatchDraw(canvas); 11201 } else { 11202 draw(canvas); 11203 } 11204 } else { 11205 mPrivateFlags &= ~DIRTY_MASK; 11206 ((HardwareCanvas) canvas).drawDisplayList(displayList, 11207 mRight - mLeft, mBottom - mTop, null); 11208 } 11209 } 11210 } else if (cache != null) { 11211 mPrivateFlags &= ~DIRTY_MASK; 11212 Paint cachePaint; 11213 11214 if (layerType == LAYER_TYPE_NONE) { 11215 cachePaint = parent.mCachePaint; 11216 if (cachePaint == null) { 11217 cachePaint = new Paint(); 11218 cachePaint.setDither(false); 11219 parent.mCachePaint = cachePaint; 11220 } 11221 if (alpha < 1.0f) { 11222 cachePaint.setAlpha((int) (alpha * 255)); 11223 parent.mGroupFlags |= parent.FLAG_ALPHA_LOWER_THAN_ONE; 11224 } else if ((flags & parent.FLAG_ALPHA_LOWER_THAN_ONE) == 11225 parent.FLAG_ALPHA_LOWER_THAN_ONE) { 11226 cachePaint.setAlpha(255); 11227 parent.mGroupFlags &= ~parent.FLAG_ALPHA_LOWER_THAN_ONE; 11228 } 11229 } else { 11230 cachePaint = mLayerPaint; 11231 cachePaint.setAlpha((int) (alpha * 255)); 11232 } 11233 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 11234 } 11235 11236 canvas.restoreToCount(restoreTo); 11237 11238 if (a != null && !more) { 11239 if (!hardwareAccelerated && !a.getFillAfter()) { 11240 onSetAlpha(255); 11241 } 11242 parent.finishAnimatingView(this, a); 11243 } 11244 11245 if (more && hardwareAccelerated) { 11246 // invalidation is the trigger to recreate display lists, so if we're using 11247 // display lists to render, force an invalidate to allow the animation to 11248 // continue drawing another frame 11249 parent.invalidate(true); 11250 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 11251 // alpha animations should cause the child to recreate its display list 11252 invalidate(true); 11253 } 11254 } 11255 11256 mRecreateDisplayList = false; 11257 11258 return more; 11259 } 11260 11261 /** 11262 * Manually render this view (and all of its children) to the given Canvas. 11263 * The view must have already done a full layout before this function is 11264 * called. When implementing a view, implement 11265 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 11266 * If you do need to override this method, call the superclass version. 11267 * 11268 * @param canvas The Canvas to which the View is rendered. 11269 */ 11270 public void draw(Canvas canvas) { 11271 if (ViewDebug.TRACE_HIERARCHY) { 11272 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 11273 } 11274 11275 final int privateFlags = mPrivateFlags; 11276 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 11277 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 11278 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 11279 11280 /* 11281 * Draw traversal performs several drawing steps which must be executed 11282 * in the appropriate order: 11283 * 11284 * 1. Draw the background 11285 * 2. If necessary, save the canvas' layers to prepare for fading 11286 * 3. Draw view's content 11287 * 4. Draw children 11288 * 5. If necessary, draw the fading edges and restore layers 11289 * 6. Draw decorations (scrollbars for instance) 11290 */ 11291 11292 // Step 1, draw the background, if needed 11293 int saveCount; 11294 11295 if (!dirtyOpaque) { 11296 final Drawable background = mBGDrawable; 11297 if (background != null) { 11298 final int scrollX = mScrollX; 11299 final int scrollY = mScrollY; 11300 11301 if (mBackgroundSizeChanged) { 11302 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 11303 mBackgroundSizeChanged = false; 11304 } 11305 11306 if ((scrollX | scrollY) == 0) { 11307 background.draw(canvas); 11308 } else { 11309 canvas.translate(scrollX, scrollY); 11310 background.draw(canvas); 11311 canvas.translate(-scrollX, -scrollY); 11312 } 11313 } 11314 } 11315 11316 // skip step 2 & 5 if possible (common case) 11317 final int viewFlags = mViewFlags; 11318 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 11319 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 11320 if (!verticalEdges && !horizontalEdges) { 11321 // Step 3, draw the content 11322 if (!dirtyOpaque) onDraw(canvas); 11323 11324 // Step 4, draw the children 11325 dispatchDraw(canvas); 11326 11327 // Step 6, draw decorations (scrollbars) 11328 onDrawScrollBars(canvas); 11329 11330 // we're done... 11331 return; 11332 } 11333 11334 /* 11335 * Here we do the full fledged routine... 11336 * (this is an uncommon case where speed matters less, 11337 * this is why we repeat some of the tests that have been 11338 * done above) 11339 */ 11340 11341 boolean drawTop = false; 11342 boolean drawBottom = false; 11343 boolean drawLeft = false; 11344 boolean drawRight = false; 11345 11346 float topFadeStrength = 0.0f; 11347 float bottomFadeStrength = 0.0f; 11348 float leftFadeStrength = 0.0f; 11349 float rightFadeStrength = 0.0f; 11350 11351 // Step 2, save the canvas' layers 11352 int paddingLeft = mPaddingLeft; 11353 11354 final boolean offsetRequired = isPaddingOffsetRequired(); 11355 if (offsetRequired) { 11356 paddingLeft += getLeftPaddingOffset(); 11357 } 11358 11359 int left = mScrollX + paddingLeft; 11360 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 11361 int top = mScrollY + getFadeTop(offsetRequired); 11362 int bottom = top + getFadeHeight(offsetRequired); 11363 11364 if (offsetRequired) { 11365 right += getRightPaddingOffset(); 11366 bottom += getBottomPaddingOffset(); 11367 } 11368 11369 final ScrollabilityCache scrollabilityCache = mScrollCache; 11370 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 11371 int length = (int) fadeHeight; 11372 11373 // clip the fade length if top and bottom fades overlap 11374 // overlapping fades produce odd-looking artifacts 11375 if (verticalEdges && (top + length > bottom - length)) { 11376 length = (bottom - top) / 2; 11377 } 11378 11379 // also clip horizontal fades if necessary 11380 if (horizontalEdges && (left + length > right - length)) { 11381 length = (right - left) / 2; 11382 } 11383 11384 if (verticalEdges) { 11385 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 11386 drawTop = topFadeStrength * fadeHeight > 1.0f; 11387 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 11388 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 11389 } 11390 11391 if (horizontalEdges) { 11392 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 11393 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 11394 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 11395 drawRight = rightFadeStrength * fadeHeight > 1.0f; 11396 } 11397 11398 saveCount = canvas.getSaveCount(); 11399 11400 int solidColor = getSolidColor(); 11401 if (solidColor == 0) { 11402 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 11403 11404 if (drawTop) { 11405 canvas.saveLayer(left, top, right, top + length, null, flags); 11406 } 11407 11408 if (drawBottom) { 11409 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 11410 } 11411 11412 if (drawLeft) { 11413 canvas.saveLayer(left, top, left + length, bottom, null, flags); 11414 } 11415 11416 if (drawRight) { 11417 canvas.saveLayer(right - length, top, right, bottom, null, flags); 11418 } 11419 } else { 11420 scrollabilityCache.setFadeColor(solidColor); 11421 } 11422 11423 // Step 3, draw the content 11424 if (!dirtyOpaque) onDraw(canvas); 11425 11426 // Step 4, draw the children 11427 dispatchDraw(canvas); 11428 11429 // Step 5, draw the fade effect and restore layers 11430 final Paint p = scrollabilityCache.paint; 11431 final Matrix matrix = scrollabilityCache.matrix; 11432 final Shader fade = scrollabilityCache.shader; 11433 11434 if (drawTop) { 11435 matrix.setScale(1, fadeHeight * topFadeStrength); 11436 matrix.postTranslate(left, top); 11437 fade.setLocalMatrix(matrix); 11438 canvas.drawRect(left, top, right, top + length, p); 11439 } 11440 11441 if (drawBottom) { 11442 matrix.setScale(1, fadeHeight * bottomFadeStrength); 11443 matrix.postRotate(180); 11444 matrix.postTranslate(left, bottom); 11445 fade.setLocalMatrix(matrix); 11446 canvas.drawRect(left, bottom - length, right, bottom, p); 11447 } 11448 11449 if (drawLeft) { 11450 matrix.setScale(1, fadeHeight * leftFadeStrength); 11451 matrix.postRotate(-90); 11452 matrix.postTranslate(left, top); 11453 fade.setLocalMatrix(matrix); 11454 canvas.drawRect(left, top, left + length, bottom, p); 11455 } 11456 11457 if (drawRight) { 11458 matrix.setScale(1, fadeHeight * rightFadeStrength); 11459 matrix.postRotate(90); 11460 matrix.postTranslate(right, top); 11461 fade.setLocalMatrix(matrix); 11462 canvas.drawRect(right - length, top, right, bottom, p); 11463 } 11464 11465 canvas.restoreToCount(saveCount); 11466 11467 // Step 6, draw decorations (scrollbars) 11468 onDrawScrollBars(canvas); 11469 } 11470 11471 /** 11472 * Override this if your view is known to always be drawn on top of a solid color background, 11473 * and needs to draw fading edges. Returning a non-zero color enables the view system to 11474 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 11475 * should be set to 0xFF. 11476 * 11477 * @see #setVerticalFadingEdgeEnabled(boolean) 11478 * @see #setHorizontalFadingEdgeEnabled(boolean) 11479 * 11480 * @return The known solid color background for this view, or 0 if the color may vary 11481 */ 11482 @ViewDebug.ExportedProperty(category = "drawing") 11483 public int getSolidColor() { 11484 return 0; 11485 } 11486 11487 /** 11488 * Build a human readable string representation of the specified view flags. 11489 * 11490 * @param flags the view flags to convert to a string 11491 * @return a String representing the supplied flags 11492 */ 11493 private static String printFlags(int flags) { 11494 String output = ""; 11495 int numFlags = 0; 11496 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 11497 output += "TAKES_FOCUS"; 11498 numFlags++; 11499 } 11500 11501 switch (flags & VISIBILITY_MASK) { 11502 case INVISIBLE: 11503 if (numFlags > 0) { 11504 output += " "; 11505 } 11506 output += "INVISIBLE"; 11507 // USELESS HERE numFlags++; 11508 break; 11509 case GONE: 11510 if (numFlags > 0) { 11511 output += " "; 11512 } 11513 output += "GONE"; 11514 // USELESS HERE numFlags++; 11515 break; 11516 default: 11517 break; 11518 } 11519 return output; 11520 } 11521 11522 /** 11523 * Build a human readable string representation of the specified private 11524 * view flags. 11525 * 11526 * @param privateFlags the private view flags to convert to a string 11527 * @return a String representing the supplied flags 11528 */ 11529 private static String printPrivateFlags(int privateFlags) { 11530 String output = ""; 11531 int numFlags = 0; 11532 11533 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 11534 output += "WANTS_FOCUS"; 11535 numFlags++; 11536 } 11537 11538 if ((privateFlags & FOCUSED) == FOCUSED) { 11539 if (numFlags > 0) { 11540 output += " "; 11541 } 11542 output += "FOCUSED"; 11543 numFlags++; 11544 } 11545 11546 if ((privateFlags & SELECTED) == SELECTED) { 11547 if (numFlags > 0) { 11548 output += " "; 11549 } 11550 output += "SELECTED"; 11551 numFlags++; 11552 } 11553 11554 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 11555 if (numFlags > 0) { 11556 output += " "; 11557 } 11558 output += "IS_ROOT_NAMESPACE"; 11559 numFlags++; 11560 } 11561 11562 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 11563 if (numFlags > 0) { 11564 output += " "; 11565 } 11566 output += "HAS_BOUNDS"; 11567 numFlags++; 11568 } 11569 11570 if ((privateFlags & DRAWN) == DRAWN) { 11571 if (numFlags > 0) { 11572 output += " "; 11573 } 11574 output += "DRAWN"; 11575 // USELESS HERE numFlags++; 11576 } 11577 return output; 11578 } 11579 11580 /** 11581 * <p>Indicates whether or not this view's layout will be requested during 11582 * the next hierarchy layout pass.</p> 11583 * 11584 * @return true if the layout will be forced during next layout pass 11585 */ 11586 public boolean isLayoutRequested() { 11587 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 11588 } 11589 11590 /** 11591 * Assign a size and position to a view and all of its 11592 * descendants 11593 * 11594 * <p>This is the second phase of the layout mechanism. 11595 * (The first is measuring). In this phase, each parent calls 11596 * layout on all of its children to position them. 11597 * This is typically done using the child measurements 11598 * that were stored in the measure pass().</p> 11599 * 11600 * <p>Derived classes should not override this method. 11601 * Derived classes with children should override 11602 * onLayout. In that method, they should 11603 * call layout on each of their children.</p> 11604 * 11605 * @param l Left position, relative to parent 11606 * @param t Top position, relative to parent 11607 * @param r Right position, relative to parent 11608 * @param b Bottom position, relative to parent 11609 */ 11610 @SuppressWarnings({"unchecked"}) 11611 public void layout(int l, int t, int r, int b) { 11612 int oldL = mLeft; 11613 int oldT = mTop; 11614 int oldB = mBottom; 11615 int oldR = mRight; 11616 boolean changed = setFrame(l, t, r, b); 11617 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 11618 if (ViewDebug.TRACE_HIERARCHY) { 11619 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 11620 } 11621 11622 onLayout(changed, l, t, r, b); 11623 mPrivateFlags &= ~LAYOUT_REQUIRED; 11624 11625 ListenerInfo li = mListenerInfo; 11626 if (li != null && li.mOnLayoutChangeListeners != null) { 11627 ArrayList<OnLayoutChangeListener> listenersCopy = 11628 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 11629 int numListeners = listenersCopy.size(); 11630 for (int i = 0; i < numListeners; ++i) { 11631 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 11632 } 11633 } 11634 } 11635 mPrivateFlags &= ~FORCE_LAYOUT; 11636 } 11637 11638 /** 11639 * Called from layout when this view should 11640 * assign a size and position to each of its children. 11641 * 11642 * Derived classes with children should override 11643 * this method and call layout on each of 11644 * their children. 11645 * @param changed This is a new size or position for this view 11646 * @param left Left position, relative to parent 11647 * @param top Top position, relative to parent 11648 * @param right Right position, relative to parent 11649 * @param bottom Bottom position, relative to parent 11650 */ 11651 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 11652 } 11653 11654 /** 11655 * Assign a size and position to this view. 11656 * 11657 * This is called from layout. 11658 * 11659 * @param left Left position, relative to parent 11660 * @param top Top position, relative to parent 11661 * @param right Right position, relative to parent 11662 * @param bottom Bottom position, relative to parent 11663 * @return true if the new size and position are different than the 11664 * previous ones 11665 * {@hide} 11666 */ 11667 protected boolean setFrame(int left, int top, int right, int bottom) { 11668 boolean changed = false; 11669 11670 if (DBG) { 11671 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 11672 + right + "," + bottom + ")"); 11673 } 11674 11675 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 11676 changed = true; 11677 11678 // Remember our drawn bit 11679 int drawn = mPrivateFlags & DRAWN; 11680 11681 int oldWidth = mRight - mLeft; 11682 int oldHeight = mBottom - mTop; 11683 int newWidth = right - left; 11684 int newHeight = bottom - top; 11685 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 11686 11687 // Invalidate our old position 11688 invalidate(sizeChanged); 11689 11690 mLeft = left; 11691 mTop = top; 11692 mRight = right; 11693 mBottom = bottom; 11694 11695 mPrivateFlags |= HAS_BOUNDS; 11696 11697 11698 if (sizeChanged) { 11699 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 11700 // A change in dimension means an auto-centered pivot point changes, too 11701 if (mTransformationInfo != null) { 11702 mTransformationInfo.mMatrixDirty = true; 11703 } 11704 } 11705 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 11706 } 11707 11708 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 11709 // If we are visible, force the DRAWN bit to on so that 11710 // this invalidate will go through (at least to our parent). 11711 // This is because someone may have invalidated this view 11712 // before this call to setFrame came in, thereby clearing 11713 // the DRAWN bit. 11714 mPrivateFlags |= DRAWN; 11715 invalidate(sizeChanged); 11716 // parent display list may need to be recreated based on a change in the bounds 11717 // of any child 11718 invalidateParentCaches(); 11719 } 11720 11721 // Reset drawn bit to original value (invalidate turns it off) 11722 mPrivateFlags |= drawn; 11723 11724 mBackgroundSizeChanged = true; 11725 } 11726 return changed; 11727 } 11728 11729 /** 11730 * Finalize inflating a view from XML. This is called as the last phase 11731 * of inflation, after all child views have been added. 11732 * 11733 * <p>Even if the subclass overrides onFinishInflate, they should always be 11734 * sure to call the super method, so that we get called. 11735 */ 11736 protected void onFinishInflate() { 11737 } 11738 11739 /** 11740 * Returns the resources associated with this view. 11741 * 11742 * @return Resources object. 11743 */ 11744 public Resources getResources() { 11745 return mResources; 11746 } 11747 11748 /** 11749 * Invalidates the specified Drawable. 11750 * 11751 * @param drawable the drawable to invalidate 11752 */ 11753 public void invalidateDrawable(Drawable drawable) { 11754 if (verifyDrawable(drawable)) { 11755 final Rect dirty = drawable.getBounds(); 11756 final int scrollX = mScrollX; 11757 final int scrollY = mScrollY; 11758 11759 invalidate(dirty.left + scrollX, dirty.top + scrollY, 11760 dirty.right + scrollX, dirty.bottom + scrollY); 11761 } 11762 } 11763 11764 /** 11765 * Schedules an action on a drawable to occur at a specified time. 11766 * 11767 * @param who the recipient of the action 11768 * @param what the action to run on the drawable 11769 * @param when the time at which the action must occur. Uses the 11770 * {@link SystemClock#uptimeMillis} timebase. 11771 */ 11772 public void scheduleDrawable(Drawable who, Runnable what, long when) { 11773 if (verifyDrawable(who) && what != null) { 11774 if (mAttachInfo != null) { 11775 mAttachInfo.mHandler.postAtTime(what, who, when); 11776 } else { 11777 ViewRootImpl.getRunQueue().postDelayed(what, when - SystemClock.uptimeMillis()); 11778 } 11779 } 11780 } 11781 11782 /** 11783 * Cancels a scheduled action on a drawable. 11784 * 11785 * @param who the recipient of the action 11786 * @param what the action to cancel 11787 */ 11788 public void unscheduleDrawable(Drawable who, Runnable what) { 11789 if (verifyDrawable(who) && what != null) { 11790 if (mAttachInfo != null) { 11791 mAttachInfo.mHandler.removeCallbacks(what, who); 11792 } else { 11793 ViewRootImpl.getRunQueue().removeCallbacks(what); 11794 } 11795 } 11796 } 11797 11798 /** 11799 * Unschedule any events associated with the given Drawable. This can be 11800 * used when selecting a new Drawable into a view, so that the previous 11801 * one is completely unscheduled. 11802 * 11803 * @param who The Drawable to unschedule. 11804 * 11805 * @see #drawableStateChanged 11806 */ 11807 public void unscheduleDrawable(Drawable who) { 11808 if (mAttachInfo != null) { 11809 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 11810 } 11811 } 11812 11813 /** 11814 * Return the layout direction of a given Drawable. 11815 * 11816 * @param who the Drawable to query 11817 * 11818 * @hide 11819 */ 11820 public int getResolvedLayoutDirection(Drawable who) { 11821 return (who == mBGDrawable) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 11822 } 11823 11824 /** 11825 * If your view subclass is displaying its own Drawable objects, it should 11826 * override this function and return true for any Drawable it is 11827 * displaying. This allows animations for those drawables to be 11828 * scheduled. 11829 * 11830 * <p>Be sure to call through to the super class when overriding this 11831 * function. 11832 * 11833 * @param who The Drawable to verify. Return true if it is one you are 11834 * displaying, else return the result of calling through to the 11835 * super class. 11836 * 11837 * @return boolean If true than the Drawable is being displayed in the 11838 * view; else false and it is not allowed to animate. 11839 * 11840 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 11841 * @see #drawableStateChanged() 11842 */ 11843 protected boolean verifyDrawable(Drawable who) { 11844 return who == mBGDrawable; 11845 } 11846 11847 /** 11848 * This function is called whenever the state of the view changes in such 11849 * a way that it impacts the state of drawables being shown. 11850 * 11851 * <p>Be sure to call through to the superclass when overriding this 11852 * function. 11853 * 11854 * @see Drawable#setState(int[]) 11855 */ 11856 protected void drawableStateChanged() { 11857 Drawable d = mBGDrawable; 11858 if (d != null && d.isStateful()) { 11859 d.setState(getDrawableState()); 11860 } 11861 } 11862 11863 /** 11864 * Call this to force a view to update its drawable state. This will cause 11865 * drawableStateChanged to be called on this view. Views that are interested 11866 * in the new state should call getDrawableState. 11867 * 11868 * @see #drawableStateChanged 11869 * @see #getDrawableState 11870 */ 11871 public void refreshDrawableState() { 11872 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11873 drawableStateChanged(); 11874 11875 ViewParent parent = mParent; 11876 if (parent != null) { 11877 parent.childDrawableStateChanged(this); 11878 } 11879 } 11880 11881 /** 11882 * Return an array of resource IDs of the drawable states representing the 11883 * current state of the view. 11884 * 11885 * @return The current drawable state 11886 * 11887 * @see Drawable#setState(int[]) 11888 * @see #drawableStateChanged() 11889 * @see #onCreateDrawableState(int) 11890 */ 11891 public final int[] getDrawableState() { 11892 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 11893 return mDrawableState; 11894 } else { 11895 mDrawableState = onCreateDrawableState(0); 11896 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 11897 return mDrawableState; 11898 } 11899 } 11900 11901 /** 11902 * Generate the new {@link android.graphics.drawable.Drawable} state for 11903 * this view. This is called by the view 11904 * system when the cached Drawable state is determined to be invalid. To 11905 * retrieve the current state, you should use {@link #getDrawableState}. 11906 * 11907 * @param extraSpace if non-zero, this is the number of extra entries you 11908 * would like in the returned array in which you can place your own 11909 * states. 11910 * 11911 * @return Returns an array holding the current {@link Drawable} state of 11912 * the view. 11913 * 11914 * @see #mergeDrawableStates(int[], int[]) 11915 */ 11916 protected int[] onCreateDrawableState(int extraSpace) { 11917 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 11918 mParent instanceof View) { 11919 return ((View) mParent).onCreateDrawableState(extraSpace); 11920 } 11921 11922 int[] drawableState; 11923 11924 int privateFlags = mPrivateFlags; 11925 11926 int viewStateIndex = 0; 11927 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 11928 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 11929 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 11930 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 11931 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 11932 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 11933 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 11934 HardwareRenderer.isAvailable()) { 11935 // This is set if HW acceleration is requested, even if the current 11936 // process doesn't allow it. This is just to allow app preview 11937 // windows to better match their app. 11938 viewStateIndex |= VIEW_STATE_ACCELERATED; 11939 } 11940 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 11941 11942 final int privateFlags2 = mPrivateFlags2; 11943 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 11944 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 11945 11946 drawableState = VIEW_STATE_SETS[viewStateIndex]; 11947 11948 //noinspection ConstantIfStatement 11949 if (false) { 11950 Log.i("View", "drawableStateIndex=" + viewStateIndex); 11951 Log.i("View", toString() 11952 + " pressed=" + ((privateFlags & PRESSED) != 0) 11953 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 11954 + " fo=" + hasFocus() 11955 + " sl=" + ((privateFlags & SELECTED) != 0) 11956 + " wf=" + hasWindowFocus() 11957 + ": " + Arrays.toString(drawableState)); 11958 } 11959 11960 if (extraSpace == 0) { 11961 return drawableState; 11962 } 11963 11964 final int[] fullState; 11965 if (drawableState != null) { 11966 fullState = new int[drawableState.length + extraSpace]; 11967 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 11968 } else { 11969 fullState = new int[extraSpace]; 11970 } 11971 11972 return fullState; 11973 } 11974 11975 /** 11976 * Merge your own state values in <var>additionalState</var> into the base 11977 * state values <var>baseState</var> that were returned by 11978 * {@link #onCreateDrawableState(int)}. 11979 * 11980 * @param baseState The base state values returned by 11981 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 11982 * own additional state values. 11983 * 11984 * @param additionalState The additional state values you would like 11985 * added to <var>baseState</var>; this array is not modified. 11986 * 11987 * @return As a convenience, the <var>baseState</var> array you originally 11988 * passed into the function is returned. 11989 * 11990 * @see #onCreateDrawableState(int) 11991 */ 11992 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 11993 final int N = baseState.length; 11994 int i = N - 1; 11995 while (i >= 0 && baseState[i] == 0) { 11996 i--; 11997 } 11998 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 11999 return baseState; 12000 } 12001 12002 /** 12003 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 12004 * on all Drawable objects associated with this view. 12005 */ 12006 public void jumpDrawablesToCurrentState() { 12007 if (mBGDrawable != null) { 12008 mBGDrawable.jumpToCurrentState(); 12009 } 12010 } 12011 12012 /** 12013 * Sets the background color for this view. 12014 * @param color the color of the background 12015 */ 12016 @RemotableViewMethod 12017 public void setBackgroundColor(int color) { 12018 if (mBGDrawable instanceof ColorDrawable) { 12019 ((ColorDrawable) mBGDrawable).setColor(color); 12020 } else { 12021 setBackgroundDrawable(new ColorDrawable(color)); 12022 } 12023 } 12024 12025 /** 12026 * Set the background to a given resource. The resource should refer to 12027 * a Drawable object or 0 to remove the background. 12028 * @param resid The identifier of the resource. 12029 * @attr ref android.R.styleable#View_background 12030 */ 12031 @RemotableViewMethod 12032 public void setBackgroundResource(int resid) { 12033 if (resid != 0 && resid == mBackgroundResource) { 12034 return; 12035 } 12036 12037 Drawable d= null; 12038 if (resid != 0) { 12039 d = mResources.getDrawable(resid); 12040 } 12041 setBackgroundDrawable(d); 12042 12043 mBackgroundResource = resid; 12044 } 12045 12046 /** 12047 * Set the background to a given Drawable, or remove the background. If the 12048 * background has padding, this View's padding is set to the background's 12049 * padding. However, when a background is removed, this View's padding isn't 12050 * touched. If setting the padding is desired, please use 12051 * {@link #setPadding(int, int, int, int)}. 12052 * 12053 * @param d The Drawable to use as the background, or null to remove the 12054 * background 12055 */ 12056 public void setBackgroundDrawable(Drawable d) { 12057 if (d == mBGDrawable) { 12058 return; 12059 } 12060 12061 boolean requestLayout = false; 12062 12063 mBackgroundResource = 0; 12064 12065 /* 12066 * Regardless of whether we're setting a new background or not, we want 12067 * to clear the previous drawable. 12068 */ 12069 if (mBGDrawable != null) { 12070 mBGDrawable.setCallback(null); 12071 unscheduleDrawable(mBGDrawable); 12072 } 12073 12074 if (d != null) { 12075 Rect padding = sThreadLocal.get(); 12076 if (padding == null) { 12077 padding = new Rect(); 12078 sThreadLocal.set(padding); 12079 } 12080 if (d.getPadding(padding)) { 12081 switch (d.getResolvedLayoutDirectionSelf()) { 12082 case LAYOUT_DIRECTION_RTL: 12083 setPadding(padding.right, padding.top, padding.left, padding.bottom); 12084 break; 12085 case LAYOUT_DIRECTION_LTR: 12086 default: 12087 setPadding(padding.left, padding.top, padding.right, padding.bottom); 12088 } 12089 } 12090 12091 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 12092 // if it has a different minimum size, we should layout again 12093 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 12094 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 12095 requestLayout = true; 12096 } 12097 12098 d.setCallback(this); 12099 if (d.isStateful()) { 12100 d.setState(getDrawableState()); 12101 } 12102 d.setVisible(getVisibility() == VISIBLE, false); 12103 mBGDrawable = d; 12104 12105 if ((mPrivateFlags & SKIP_DRAW) != 0) { 12106 mPrivateFlags &= ~SKIP_DRAW; 12107 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 12108 requestLayout = true; 12109 } 12110 } else { 12111 /* Remove the background */ 12112 mBGDrawable = null; 12113 12114 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 12115 /* 12116 * This view ONLY drew the background before and we're removing 12117 * the background, so now it won't draw anything 12118 * (hence we SKIP_DRAW) 12119 */ 12120 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 12121 mPrivateFlags |= SKIP_DRAW; 12122 } 12123 12124 /* 12125 * When the background is set, we try to apply its padding to this 12126 * View. When the background is removed, we don't touch this View's 12127 * padding. This is noted in the Javadocs. Hence, we don't need to 12128 * requestLayout(), the invalidate() below is sufficient. 12129 */ 12130 12131 // The old background's minimum size could have affected this 12132 // View's layout, so let's requestLayout 12133 requestLayout = true; 12134 } 12135 12136 computeOpaqueFlags(); 12137 12138 if (requestLayout) { 12139 requestLayout(); 12140 } 12141 12142 mBackgroundSizeChanged = true; 12143 invalidate(true); 12144 } 12145 12146 /** 12147 * Gets the background drawable 12148 * @return The drawable used as the background for this view, if any. 12149 */ 12150 public Drawable getBackground() { 12151 return mBGDrawable; 12152 } 12153 12154 /** 12155 * Sets the padding. The view may add on the space required to display 12156 * the scrollbars, depending on the style and visibility of the scrollbars. 12157 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 12158 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 12159 * from the values set in this call. 12160 * 12161 * @attr ref android.R.styleable#View_padding 12162 * @attr ref android.R.styleable#View_paddingBottom 12163 * @attr ref android.R.styleable#View_paddingLeft 12164 * @attr ref android.R.styleable#View_paddingRight 12165 * @attr ref android.R.styleable#View_paddingTop 12166 * @param left the left padding in pixels 12167 * @param top the top padding in pixels 12168 * @param right the right padding in pixels 12169 * @param bottom the bottom padding in pixels 12170 */ 12171 public void setPadding(int left, int top, int right, int bottom) { 12172 boolean changed = false; 12173 12174 mUserPaddingRelative = false; 12175 12176 mUserPaddingLeft = left; 12177 mUserPaddingRight = right; 12178 mUserPaddingBottom = bottom; 12179 12180 final int viewFlags = mViewFlags; 12181 12182 // Common case is there are no scroll bars. 12183 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 12184 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 12185 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 12186 ? 0 : getVerticalScrollbarWidth(); 12187 switch (mVerticalScrollbarPosition) { 12188 case SCROLLBAR_POSITION_DEFAULT: 12189 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 12190 left += offset; 12191 } else { 12192 right += offset; 12193 } 12194 break; 12195 case SCROLLBAR_POSITION_RIGHT: 12196 right += offset; 12197 break; 12198 case SCROLLBAR_POSITION_LEFT: 12199 left += offset; 12200 break; 12201 } 12202 } 12203 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 12204 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 12205 ? 0 : getHorizontalScrollbarHeight(); 12206 } 12207 } 12208 12209 if (mPaddingLeft != left) { 12210 changed = true; 12211 mPaddingLeft = left; 12212 } 12213 if (mPaddingTop != top) { 12214 changed = true; 12215 mPaddingTop = top; 12216 } 12217 if (mPaddingRight != right) { 12218 changed = true; 12219 mPaddingRight = right; 12220 } 12221 if (mPaddingBottom != bottom) { 12222 changed = true; 12223 mPaddingBottom = bottom; 12224 } 12225 12226 if (changed) { 12227 requestLayout(); 12228 } 12229 } 12230 12231 /** 12232 * Sets the relative padding. The view may add on the space required to display 12233 * the scrollbars, depending on the style and visibility of the scrollbars. 12234 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 12235 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 12236 * from the values set in this call. 12237 * 12238 * @attr ref android.R.styleable#View_padding 12239 * @attr ref android.R.styleable#View_paddingBottom 12240 * @attr ref android.R.styleable#View_paddingStart 12241 * @attr ref android.R.styleable#View_paddingEnd 12242 * @attr ref android.R.styleable#View_paddingTop 12243 * @param start the start padding in pixels 12244 * @param top the top padding in pixels 12245 * @param end the end padding in pixels 12246 * @param bottom the bottom padding in pixels 12247 * 12248 * @hide 12249 */ 12250 public void setPaddingRelative(int start, int top, int end, int bottom) { 12251 mUserPaddingRelative = true; 12252 12253 mUserPaddingStart = start; 12254 mUserPaddingEnd = end; 12255 12256 switch(getResolvedLayoutDirection()) { 12257 case LAYOUT_DIRECTION_RTL: 12258 setPadding(end, top, start, bottom); 12259 break; 12260 case LAYOUT_DIRECTION_LTR: 12261 default: 12262 setPadding(start, top, end, bottom); 12263 } 12264 } 12265 12266 /** 12267 * Returns the top padding of this view. 12268 * 12269 * @return the top padding in pixels 12270 */ 12271 public int getPaddingTop() { 12272 return mPaddingTop; 12273 } 12274 12275 /** 12276 * Returns the bottom padding of this view. If there are inset and enabled 12277 * scrollbars, this value may include the space required to display the 12278 * scrollbars as well. 12279 * 12280 * @return the bottom padding in pixels 12281 */ 12282 public int getPaddingBottom() { 12283 return mPaddingBottom; 12284 } 12285 12286 /** 12287 * Returns the left padding of this view. If there are inset and enabled 12288 * scrollbars, this value may include the space required to display the 12289 * scrollbars as well. 12290 * 12291 * @return the left padding in pixels 12292 */ 12293 public int getPaddingLeft() { 12294 return mPaddingLeft; 12295 } 12296 12297 /** 12298 * Returns the start padding of this view. If there are inset and enabled 12299 * scrollbars, this value may include the space required to display the 12300 * scrollbars as well. 12301 * 12302 * @return the start padding in pixels 12303 * 12304 * @hide 12305 */ 12306 public int getPaddingStart() { 12307 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 12308 mPaddingRight : mPaddingLeft; 12309 } 12310 12311 /** 12312 * Returns the right padding of this view. If there are inset and enabled 12313 * scrollbars, this value may include the space required to display the 12314 * scrollbars as well. 12315 * 12316 * @return the right padding in pixels 12317 */ 12318 public int getPaddingRight() { 12319 return mPaddingRight; 12320 } 12321 12322 /** 12323 * Returns the end padding of this view. If there are inset and enabled 12324 * scrollbars, this value may include the space required to display the 12325 * scrollbars as well. 12326 * 12327 * @return the end padding in pixels 12328 * 12329 * @hide 12330 */ 12331 public int getPaddingEnd() { 12332 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 12333 mPaddingLeft : mPaddingRight; 12334 } 12335 12336 /** 12337 * Return if the padding as been set thru relative values 12338 * {@link #setPaddingRelative(int, int, int, int)} or thru 12339 * @attr ref android.R.styleable#View_paddingStart or 12340 * @attr ref android.R.styleable#View_paddingEnd 12341 * 12342 * @return true if the padding is relative or false if it is not. 12343 * 12344 * @hide 12345 */ 12346 public boolean isPaddingRelative() { 12347 return mUserPaddingRelative; 12348 } 12349 12350 /** 12351 * Changes the selection state of this view. A view can be selected or not. 12352 * Note that selection is not the same as focus. Views are typically 12353 * selected in the context of an AdapterView like ListView or GridView; 12354 * the selected view is the view that is highlighted. 12355 * 12356 * @param selected true if the view must be selected, false otherwise 12357 */ 12358 public void setSelected(boolean selected) { 12359 if (((mPrivateFlags & SELECTED) != 0) != selected) { 12360 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 12361 if (!selected) resetPressedState(); 12362 invalidate(true); 12363 refreshDrawableState(); 12364 dispatchSetSelected(selected); 12365 } 12366 } 12367 12368 /** 12369 * Dispatch setSelected to all of this View's children. 12370 * 12371 * @see #setSelected(boolean) 12372 * 12373 * @param selected The new selected state 12374 */ 12375 protected void dispatchSetSelected(boolean selected) { 12376 } 12377 12378 /** 12379 * Indicates the selection state of this view. 12380 * 12381 * @return true if the view is selected, false otherwise 12382 */ 12383 @ViewDebug.ExportedProperty 12384 public boolean isSelected() { 12385 return (mPrivateFlags & SELECTED) != 0; 12386 } 12387 12388 /** 12389 * Changes the activated state of this view. A view can be activated or not. 12390 * Note that activation is not the same as selection. Selection is 12391 * a transient property, representing the view (hierarchy) the user is 12392 * currently interacting with. Activation is a longer-term state that the 12393 * user can move views in and out of. For example, in a list view with 12394 * single or multiple selection enabled, the views in the current selection 12395 * set are activated. (Um, yeah, we are deeply sorry about the terminology 12396 * here.) The activated state is propagated down to children of the view it 12397 * is set on. 12398 * 12399 * @param activated true if the view must be activated, false otherwise 12400 */ 12401 public void setActivated(boolean activated) { 12402 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 12403 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 12404 invalidate(true); 12405 refreshDrawableState(); 12406 dispatchSetActivated(activated); 12407 } 12408 } 12409 12410 /** 12411 * Dispatch setActivated to all of this View's children. 12412 * 12413 * @see #setActivated(boolean) 12414 * 12415 * @param activated The new activated state 12416 */ 12417 protected void dispatchSetActivated(boolean activated) { 12418 } 12419 12420 /** 12421 * Indicates the activation state of this view. 12422 * 12423 * @return true if the view is activated, false otherwise 12424 */ 12425 @ViewDebug.ExportedProperty 12426 public boolean isActivated() { 12427 return (mPrivateFlags & ACTIVATED) != 0; 12428 } 12429 12430 /** 12431 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 12432 * observer can be used to get notifications when global events, like 12433 * layout, happen. 12434 * 12435 * The returned ViewTreeObserver observer is not guaranteed to remain 12436 * valid for the lifetime of this View. If the caller of this method keeps 12437 * a long-lived reference to ViewTreeObserver, it should always check for 12438 * the return value of {@link ViewTreeObserver#isAlive()}. 12439 * 12440 * @return The ViewTreeObserver for this view's hierarchy. 12441 */ 12442 public ViewTreeObserver getViewTreeObserver() { 12443 if (mAttachInfo != null) { 12444 return mAttachInfo.mTreeObserver; 12445 } 12446 if (mFloatingTreeObserver == null) { 12447 mFloatingTreeObserver = new ViewTreeObserver(); 12448 } 12449 return mFloatingTreeObserver; 12450 } 12451 12452 /** 12453 * <p>Finds the topmost view in the current view hierarchy.</p> 12454 * 12455 * @return the topmost view containing this view 12456 */ 12457 public View getRootView() { 12458 if (mAttachInfo != null) { 12459 final View v = mAttachInfo.mRootView; 12460 if (v != null) { 12461 return v; 12462 } 12463 } 12464 12465 View parent = this; 12466 12467 while (parent.mParent != null && parent.mParent instanceof View) { 12468 parent = (View) parent.mParent; 12469 } 12470 12471 return parent; 12472 } 12473 12474 /** 12475 * <p>Computes the coordinates of this view on the screen. The argument 12476 * must be an array of two integers. After the method returns, the array 12477 * contains the x and y location in that order.</p> 12478 * 12479 * @param location an array of two integers in which to hold the coordinates 12480 */ 12481 public void getLocationOnScreen(int[] location) { 12482 getLocationInWindow(location); 12483 12484 final AttachInfo info = mAttachInfo; 12485 if (info != null) { 12486 location[0] += info.mWindowLeft; 12487 location[1] += info.mWindowTop; 12488 } 12489 } 12490 12491 /** 12492 * <p>Computes the coordinates of this view in its window. The argument 12493 * must be an array of two integers. After the method returns, the array 12494 * contains the x and y location in that order.</p> 12495 * 12496 * @param location an array of two integers in which to hold the coordinates 12497 */ 12498 public void getLocationInWindow(int[] location) { 12499 if (location == null || location.length < 2) { 12500 throw new IllegalArgumentException("location must be an array of two integers"); 12501 } 12502 12503 if (mAttachInfo == null) { 12504 // When the view is not attached to a window, this method does not make sense 12505 location[0] = location[1] = 0; 12506 return; 12507 } 12508 12509 float[] position = mAttachInfo.mTmpTransformLocation; 12510 position[0] = position[1] = 0.0f; 12511 12512 if (!hasIdentityMatrix()) { 12513 getMatrix().mapPoints(position); 12514 } 12515 12516 position[0] += mLeft; 12517 position[1] += mTop; 12518 12519 ViewParent viewParent = mParent; 12520 while (viewParent instanceof View) { 12521 final View view = (View) viewParent; 12522 12523 position[0] -= view.mScrollX; 12524 position[1] -= view.mScrollY; 12525 12526 if (!view.hasIdentityMatrix()) { 12527 view.getMatrix().mapPoints(position); 12528 } 12529 12530 position[0] += view.mLeft; 12531 position[1] += view.mTop; 12532 12533 viewParent = view.mParent; 12534 } 12535 12536 if (viewParent instanceof ViewRootImpl) { 12537 // *cough* 12538 final ViewRootImpl vr = (ViewRootImpl) viewParent; 12539 position[1] -= vr.mCurScrollY; 12540 } 12541 12542 location[0] = (int) (position[0] + 0.5f); 12543 location[1] = (int) (position[1] + 0.5f); 12544 } 12545 12546 /** 12547 * {@hide} 12548 * @param id the id of the view to be found 12549 * @return the view of the specified id, null if cannot be found 12550 */ 12551 protected View findViewTraversal(int id) { 12552 if (id == mID) { 12553 return this; 12554 } 12555 return null; 12556 } 12557 12558 /** 12559 * {@hide} 12560 * @param tag the tag of the view to be found 12561 * @return the view of specified tag, null if cannot be found 12562 */ 12563 protected View findViewWithTagTraversal(Object tag) { 12564 if (tag != null && tag.equals(mTag)) { 12565 return this; 12566 } 12567 return null; 12568 } 12569 12570 /** 12571 * {@hide} 12572 * @param predicate The predicate to evaluate. 12573 * @param childToSkip If not null, ignores this child during the recursive traversal. 12574 * @return The first view that matches the predicate or null. 12575 */ 12576 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 12577 if (predicate.apply(this)) { 12578 return this; 12579 } 12580 return null; 12581 } 12582 12583 /** 12584 * Look for a child view with the given id. If this view has the given 12585 * id, return this view. 12586 * 12587 * @param id The id to search for. 12588 * @return The view that has the given id in the hierarchy or null 12589 */ 12590 public final View findViewById(int id) { 12591 if (id < 0) { 12592 return null; 12593 } 12594 return findViewTraversal(id); 12595 } 12596 12597 /** 12598 * Finds a view by its unuque and stable accessibility id. 12599 * 12600 * @param accessibilityId The searched accessibility id. 12601 * @return The found view. 12602 */ 12603 final View findViewByAccessibilityId(int accessibilityId) { 12604 if (accessibilityId < 0) { 12605 return null; 12606 } 12607 return findViewByAccessibilityIdTraversal(accessibilityId); 12608 } 12609 12610 /** 12611 * Performs the traversal to find a view by its unuque and stable accessibility id. 12612 * 12613 * <strong>Note:</strong>This method does not stop at the root namespace 12614 * boundary since the user can touch the screen at an arbitrary location 12615 * potentially crossing the root namespace bounday which will send an 12616 * accessibility event to accessibility services and they should be able 12617 * to obtain the event source. Also accessibility ids are guaranteed to be 12618 * unique in the window. 12619 * 12620 * @param accessibilityId The accessibility id. 12621 * @return The found view. 12622 */ 12623 View findViewByAccessibilityIdTraversal(int accessibilityId) { 12624 if (getAccessibilityViewId() == accessibilityId) { 12625 return this; 12626 } 12627 return null; 12628 } 12629 12630 /** 12631 * Look for a child view with the given tag. If this view has the given 12632 * tag, return this view. 12633 * 12634 * @param tag The tag to search for, using "tag.equals(getTag())". 12635 * @return The View that has the given tag in the hierarchy or null 12636 */ 12637 public final View findViewWithTag(Object tag) { 12638 if (tag == null) { 12639 return null; 12640 } 12641 return findViewWithTagTraversal(tag); 12642 } 12643 12644 /** 12645 * {@hide} 12646 * Look for a child view that matches the specified predicate. 12647 * If this view matches the predicate, return this view. 12648 * 12649 * @param predicate The predicate to evaluate. 12650 * @return The first view that matches the predicate or null. 12651 */ 12652 public final View findViewByPredicate(Predicate<View> predicate) { 12653 return findViewByPredicateTraversal(predicate, null); 12654 } 12655 12656 /** 12657 * {@hide} 12658 * Look for a child view that matches the specified predicate, 12659 * starting with the specified view and its descendents and then 12660 * recusively searching the ancestors and siblings of that view 12661 * until this view is reached. 12662 * 12663 * This method is useful in cases where the predicate does not match 12664 * a single unique view (perhaps multiple views use the same id) 12665 * and we are trying to find the view that is "closest" in scope to the 12666 * starting view. 12667 * 12668 * @param start The view to start from. 12669 * @param predicate The predicate to evaluate. 12670 * @return The first view that matches the predicate or null. 12671 */ 12672 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 12673 View childToSkip = null; 12674 for (;;) { 12675 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 12676 if (view != null || start == this) { 12677 return view; 12678 } 12679 12680 ViewParent parent = start.getParent(); 12681 if (parent == null || !(parent instanceof View)) { 12682 return null; 12683 } 12684 12685 childToSkip = start; 12686 start = (View) parent; 12687 } 12688 } 12689 12690 /** 12691 * Sets the identifier for this view. The identifier does not have to be 12692 * unique in this view's hierarchy. The identifier should be a positive 12693 * number. 12694 * 12695 * @see #NO_ID 12696 * @see #getId() 12697 * @see #findViewById(int) 12698 * 12699 * @param id a number used to identify the view 12700 * 12701 * @attr ref android.R.styleable#View_id 12702 */ 12703 public void setId(int id) { 12704 mID = id; 12705 } 12706 12707 /** 12708 * {@hide} 12709 * 12710 * @param isRoot true if the view belongs to the root namespace, false 12711 * otherwise 12712 */ 12713 public void setIsRootNamespace(boolean isRoot) { 12714 if (isRoot) { 12715 mPrivateFlags |= IS_ROOT_NAMESPACE; 12716 } else { 12717 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 12718 } 12719 } 12720 12721 /** 12722 * {@hide} 12723 * 12724 * @return true if the view belongs to the root namespace, false otherwise 12725 */ 12726 public boolean isRootNamespace() { 12727 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 12728 } 12729 12730 /** 12731 * Returns this view's identifier. 12732 * 12733 * @return a positive integer used to identify the view or {@link #NO_ID} 12734 * if the view has no ID 12735 * 12736 * @see #setId(int) 12737 * @see #findViewById(int) 12738 * @attr ref android.R.styleable#View_id 12739 */ 12740 @ViewDebug.CapturedViewProperty 12741 public int getId() { 12742 return mID; 12743 } 12744 12745 /** 12746 * Returns this view's tag. 12747 * 12748 * @return the Object stored in this view as a tag 12749 * 12750 * @see #setTag(Object) 12751 * @see #getTag(int) 12752 */ 12753 @ViewDebug.ExportedProperty 12754 public Object getTag() { 12755 return mTag; 12756 } 12757 12758 /** 12759 * Sets the tag associated with this view. A tag can be used to mark 12760 * a view in its hierarchy and does not have to be unique within the 12761 * hierarchy. Tags can also be used to store data within a view without 12762 * resorting to another data structure. 12763 * 12764 * @param tag an Object to tag the view with 12765 * 12766 * @see #getTag() 12767 * @see #setTag(int, Object) 12768 */ 12769 public void setTag(final Object tag) { 12770 mTag = tag; 12771 } 12772 12773 /** 12774 * Returns the tag associated with this view and the specified key. 12775 * 12776 * @param key The key identifying the tag 12777 * 12778 * @return the Object stored in this view as a tag 12779 * 12780 * @see #setTag(int, Object) 12781 * @see #getTag() 12782 */ 12783 public Object getTag(int key) { 12784 if (mKeyedTags != null) return mKeyedTags.get(key); 12785 return null; 12786 } 12787 12788 /** 12789 * Sets a tag associated with this view and a key. A tag can be used 12790 * to mark a view in its hierarchy and does not have to be unique within 12791 * the hierarchy. Tags can also be used to store data within a view 12792 * without resorting to another data structure. 12793 * 12794 * The specified key should be an id declared in the resources of the 12795 * application to ensure it is unique (see the <a 12796 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 12797 * Keys identified as belonging to 12798 * the Android framework or not associated with any package will cause 12799 * an {@link IllegalArgumentException} to be thrown. 12800 * 12801 * @param key The key identifying the tag 12802 * @param tag An Object to tag the view with 12803 * 12804 * @throws IllegalArgumentException If they specified key is not valid 12805 * 12806 * @see #setTag(Object) 12807 * @see #getTag(int) 12808 */ 12809 public void setTag(int key, final Object tag) { 12810 // If the package id is 0x00 or 0x01, it's either an undefined package 12811 // or a framework id 12812 if ((key >>> 24) < 2) { 12813 throw new IllegalArgumentException("The key must be an application-specific " 12814 + "resource id."); 12815 } 12816 12817 setKeyedTag(key, tag); 12818 } 12819 12820 /** 12821 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 12822 * framework id. 12823 * 12824 * @hide 12825 */ 12826 public void setTagInternal(int key, Object tag) { 12827 if ((key >>> 24) != 0x1) { 12828 throw new IllegalArgumentException("The key must be a framework-specific " 12829 + "resource id."); 12830 } 12831 12832 setKeyedTag(key, tag); 12833 } 12834 12835 private void setKeyedTag(int key, Object tag) { 12836 if (mKeyedTags == null) { 12837 mKeyedTags = new SparseArray<Object>(); 12838 } 12839 12840 mKeyedTags.put(key, tag); 12841 } 12842 12843 /** 12844 * @param consistency The type of consistency. See ViewDebug for more information. 12845 * 12846 * @hide 12847 */ 12848 protected boolean dispatchConsistencyCheck(int consistency) { 12849 return onConsistencyCheck(consistency); 12850 } 12851 12852 /** 12853 * Method that subclasses should implement to check their consistency. The type of 12854 * consistency check is indicated by the bit field passed as a parameter. 12855 * 12856 * @param consistency The type of consistency. See ViewDebug for more information. 12857 * 12858 * @throws IllegalStateException if the view is in an inconsistent state. 12859 * 12860 * @hide 12861 */ 12862 protected boolean onConsistencyCheck(int consistency) { 12863 boolean result = true; 12864 12865 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 12866 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 12867 12868 if (checkLayout) { 12869 if (getParent() == null) { 12870 result = false; 12871 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12872 "View " + this + " does not have a parent."); 12873 } 12874 12875 if (mAttachInfo == null) { 12876 result = false; 12877 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12878 "View " + this + " is not attached to a window."); 12879 } 12880 } 12881 12882 if (checkDrawing) { 12883 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 12884 // from their draw() method 12885 12886 if ((mPrivateFlags & DRAWN) != DRAWN && 12887 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 12888 result = false; 12889 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12890 "View " + this + " was invalidated but its drawing cache is valid."); 12891 } 12892 } 12893 12894 return result; 12895 } 12896 12897 /** 12898 * Prints information about this view in the log output, with the tag 12899 * {@link #VIEW_LOG_TAG}. 12900 * 12901 * @hide 12902 */ 12903 public void debug() { 12904 debug(0); 12905 } 12906 12907 /** 12908 * Prints information about this view in the log output, with the tag 12909 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 12910 * indentation defined by the <code>depth</code>. 12911 * 12912 * @param depth the indentation level 12913 * 12914 * @hide 12915 */ 12916 protected void debug(int depth) { 12917 String output = debugIndent(depth - 1); 12918 12919 output += "+ " + this; 12920 int id = getId(); 12921 if (id != -1) { 12922 output += " (id=" + id + ")"; 12923 } 12924 Object tag = getTag(); 12925 if (tag != null) { 12926 output += " (tag=" + tag + ")"; 12927 } 12928 Log.d(VIEW_LOG_TAG, output); 12929 12930 if ((mPrivateFlags & FOCUSED) != 0) { 12931 output = debugIndent(depth) + " FOCUSED"; 12932 Log.d(VIEW_LOG_TAG, output); 12933 } 12934 12935 output = debugIndent(depth); 12936 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 12937 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 12938 + "} "; 12939 Log.d(VIEW_LOG_TAG, output); 12940 12941 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 12942 || mPaddingBottom != 0) { 12943 output = debugIndent(depth); 12944 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 12945 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 12946 Log.d(VIEW_LOG_TAG, output); 12947 } 12948 12949 output = debugIndent(depth); 12950 output += "mMeasureWidth=" + mMeasuredWidth + 12951 " mMeasureHeight=" + mMeasuredHeight; 12952 Log.d(VIEW_LOG_TAG, output); 12953 12954 output = debugIndent(depth); 12955 if (mLayoutParams == null) { 12956 output += "BAD! no layout params"; 12957 } else { 12958 output = mLayoutParams.debug(output); 12959 } 12960 Log.d(VIEW_LOG_TAG, output); 12961 12962 output = debugIndent(depth); 12963 output += "flags={"; 12964 output += View.printFlags(mViewFlags); 12965 output += "}"; 12966 Log.d(VIEW_LOG_TAG, output); 12967 12968 output = debugIndent(depth); 12969 output += "privateFlags={"; 12970 output += View.printPrivateFlags(mPrivateFlags); 12971 output += "}"; 12972 Log.d(VIEW_LOG_TAG, output); 12973 } 12974 12975 /** 12976 * Creates an string of whitespaces used for indentation. 12977 * 12978 * @param depth the indentation level 12979 * @return a String containing (depth * 2 + 3) * 2 white spaces 12980 * 12981 * @hide 12982 */ 12983 protected static String debugIndent(int depth) { 12984 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 12985 for (int i = 0; i < (depth * 2) + 3; i++) { 12986 spaces.append(' ').append(' '); 12987 } 12988 return spaces.toString(); 12989 } 12990 12991 /** 12992 * <p>Return the offset of the widget's text baseline from the widget's top 12993 * boundary. If this widget does not support baseline alignment, this 12994 * method returns -1. </p> 12995 * 12996 * @return the offset of the baseline within the widget's bounds or -1 12997 * if baseline alignment is not supported 12998 */ 12999 @ViewDebug.ExportedProperty(category = "layout") 13000 public int getBaseline() { 13001 return -1; 13002 } 13003 13004 /** 13005 * Call this when something has changed which has invalidated the 13006 * layout of this view. This will schedule a layout pass of the view 13007 * tree. 13008 */ 13009 public void requestLayout() { 13010 if (ViewDebug.TRACE_HIERARCHY) { 13011 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 13012 } 13013 13014 if (getAccessibilityNodeProvider() != null) { 13015 throw new IllegalStateException("Views with AccessibilityNodeProvider" 13016 + " can't have children."); 13017 } 13018 13019 mPrivateFlags |= FORCE_LAYOUT; 13020 mPrivateFlags |= INVALIDATED; 13021 13022 if (mParent != null) { 13023 if (mLayoutParams != null) { 13024 mLayoutParams.resolveWithDirection(getResolvedLayoutDirection()); 13025 } 13026 if (!mParent.isLayoutRequested()) { 13027 mParent.requestLayout(); 13028 } 13029 } 13030 } 13031 13032 /** 13033 * Forces this view to be laid out during the next layout pass. 13034 * This method does not call requestLayout() or forceLayout() 13035 * on the parent. 13036 */ 13037 public void forceLayout() { 13038 mPrivateFlags |= FORCE_LAYOUT; 13039 mPrivateFlags |= INVALIDATED; 13040 } 13041 13042 /** 13043 * <p> 13044 * This is called to find out how big a view should be. The parent 13045 * supplies constraint information in the width and height parameters. 13046 * </p> 13047 * 13048 * <p> 13049 * The actual measurement work of a view is performed in 13050 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 13051 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 13052 * </p> 13053 * 13054 * 13055 * @param widthMeasureSpec Horizontal space requirements as imposed by the 13056 * parent 13057 * @param heightMeasureSpec Vertical space requirements as imposed by the 13058 * parent 13059 * 13060 * @see #onMeasure(int, int) 13061 */ 13062 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 13063 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 13064 widthMeasureSpec != mOldWidthMeasureSpec || 13065 heightMeasureSpec != mOldHeightMeasureSpec) { 13066 13067 // first clears the measured dimension flag 13068 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 13069 13070 if (ViewDebug.TRACE_HIERARCHY) { 13071 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 13072 } 13073 13074 // measure ourselves, this should set the measured dimension flag back 13075 onMeasure(widthMeasureSpec, heightMeasureSpec); 13076 13077 // flag not set, setMeasuredDimension() was not invoked, we raise 13078 // an exception to warn the developer 13079 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 13080 throw new IllegalStateException("onMeasure() did not set the" 13081 + " measured dimension by calling" 13082 + " setMeasuredDimension()"); 13083 } 13084 13085 mPrivateFlags |= LAYOUT_REQUIRED; 13086 } 13087 13088 mOldWidthMeasureSpec = widthMeasureSpec; 13089 mOldHeightMeasureSpec = heightMeasureSpec; 13090 } 13091 13092 /** 13093 * <p> 13094 * Measure the view and its content to determine the measured width and the 13095 * measured height. This method is invoked by {@link #measure(int, int)} and 13096 * should be overriden by subclasses to provide accurate and efficient 13097 * measurement of their contents. 13098 * </p> 13099 * 13100 * <p> 13101 * <strong>CONTRACT:</strong> When overriding this method, you 13102 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 13103 * measured width and height of this view. Failure to do so will trigger an 13104 * <code>IllegalStateException</code>, thrown by 13105 * {@link #measure(int, int)}. Calling the superclass' 13106 * {@link #onMeasure(int, int)} is a valid use. 13107 * </p> 13108 * 13109 * <p> 13110 * The base class implementation of measure defaults to the background size, 13111 * unless a larger size is allowed by the MeasureSpec. Subclasses should 13112 * override {@link #onMeasure(int, int)} to provide better measurements of 13113 * their content. 13114 * </p> 13115 * 13116 * <p> 13117 * If this method is overridden, it is the subclass's responsibility to make 13118 * sure the measured height and width are at least the view's minimum height 13119 * and width ({@link #getSuggestedMinimumHeight()} and 13120 * {@link #getSuggestedMinimumWidth()}). 13121 * </p> 13122 * 13123 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 13124 * The requirements are encoded with 13125 * {@link android.view.View.MeasureSpec}. 13126 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 13127 * The requirements are encoded with 13128 * {@link android.view.View.MeasureSpec}. 13129 * 13130 * @see #getMeasuredWidth() 13131 * @see #getMeasuredHeight() 13132 * @see #setMeasuredDimension(int, int) 13133 * @see #getSuggestedMinimumHeight() 13134 * @see #getSuggestedMinimumWidth() 13135 * @see android.view.View.MeasureSpec#getMode(int) 13136 * @see android.view.View.MeasureSpec#getSize(int) 13137 */ 13138 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 13139 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 13140 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 13141 } 13142 13143 /** 13144 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 13145 * measured width and measured height. Failing to do so will trigger an 13146 * exception at measurement time.</p> 13147 * 13148 * @param measuredWidth The measured width 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 * @param measuredHeight The measured height of this view. May be a complex 13152 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 13153 * {@link #MEASURED_STATE_TOO_SMALL}. 13154 */ 13155 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 13156 mMeasuredWidth = measuredWidth; 13157 mMeasuredHeight = measuredHeight; 13158 13159 mPrivateFlags |= MEASURED_DIMENSION_SET; 13160 } 13161 13162 /** 13163 * Merge two states as returned by {@link #getMeasuredState()}. 13164 * @param curState The current state as returned from a view or the result 13165 * of combining multiple views. 13166 * @param newState The new view state to combine. 13167 * @return Returns a new integer reflecting the combination of the two 13168 * states. 13169 */ 13170 public static int combineMeasuredStates(int curState, int newState) { 13171 return curState | newState; 13172 } 13173 13174 /** 13175 * Version of {@link #resolveSizeAndState(int, int, int)} 13176 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 13177 */ 13178 public static int resolveSize(int size, int measureSpec) { 13179 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 13180 } 13181 13182 /** 13183 * Utility to reconcile a desired size and state, with constraints imposed 13184 * by a MeasureSpec. Will take the desired size, unless a different size 13185 * is imposed by the constraints. The returned value is a compound integer, 13186 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 13187 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 13188 * size is smaller than the size the view wants to be. 13189 * 13190 * @param size How big the view wants to be 13191 * @param measureSpec Constraints imposed by the parent 13192 * @return Size information bit mask as defined by 13193 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 13194 */ 13195 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 13196 int result = size; 13197 int specMode = MeasureSpec.getMode(measureSpec); 13198 int specSize = MeasureSpec.getSize(measureSpec); 13199 switch (specMode) { 13200 case MeasureSpec.UNSPECIFIED: 13201 result = size; 13202 break; 13203 case MeasureSpec.AT_MOST: 13204 if (specSize < size) { 13205 result = specSize | MEASURED_STATE_TOO_SMALL; 13206 } else { 13207 result = size; 13208 } 13209 break; 13210 case MeasureSpec.EXACTLY: 13211 result = specSize; 13212 break; 13213 } 13214 return result | (childMeasuredState&MEASURED_STATE_MASK); 13215 } 13216 13217 /** 13218 * Utility to return a default size. Uses the supplied size if the 13219 * MeasureSpec imposed no constraints. Will get larger if allowed 13220 * by the MeasureSpec. 13221 * 13222 * @param size Default size for this view 13223 * @param measureSpec Constraints imposed by the parent 13224 * @return The size this view should be. 13225 */ 13226 public static int getDefaultSize(int size, int measureSpec) { 13227 int result = size; 13228 int specMode = MeasureSpec.getMode(measureSpec); 13229 int specSize = MeasureSpec.getSize(measureSpec); 13230 13231 switch (specMode) { 13232 case MeasureSpec.UNSPECIFIED: 13233 result = size; 13234 break; 13235 case MeasureSpec.AT_MOST: 13236 case MeasureSpec.EXACTLY: 13237 result = specSize; 13238 break; 13239 } 13240 return result; 13241 } 13242 13243 /** 13244 * Returns the suggested minimum height that the view should use. This 13245 * returns the maximum of the view's minimum height 13246 * and the background's minimum height 13247 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 13248 * <p> 13249 * When being used in {@link #onMeasure(int, int)}, the caller should still 13250 * ensure the returned height is within the requirements of the parent. 13251 * 13252 * @return The suggested minimum height of the view. 13253 */ 13254 protected int getSuggestedMinimumHeight() { 13255 int suggestedMinHeight = mMinHeight; 13256 13257 if (mBGDrawable != null) { 13258 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 13259 if (suggestedMinHeight < bgMinHeight) { 13260 suggestedMinHeight = bgMinHeight; 13261 } 13262 } 13263 13264 return suggestedMinHeight; 13265 } 13266 13267 /** 13268 * Returns the suggested minimum width that the view should use. This 13269 * returns the maximum of the view's minimum width) 13270 * and the background's minimum width 13271 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 13272 * <p> 13273 * When being used in {@link #onMeasure(int, int)}, the caller should still 13274 * ensure the returned width is within the requirements of the parent. 13275 * 13276 * @return The suggested minimum width of the view. 13277 */ 13278 protected int getSuggestedMinimumWidth() { 13279 int suggestedMinWidth = mMinWidth; 13280 13281 if (mBGDrawable != null) { 13282 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 13283 if (suggestedMinWidth < bgMinWidth) { 13284 suggestedMinWidth = bgMinWidth; 13285 } 13286 } 13287 13288 return suggestedMinWidth; 13289 } 13290 13291 /** 13292 * Sets the minimum height of the view. It is not guaranteed the view will 13293 * be able to achieve this minimum height (for example, if its parent layout 13294 * constrains it with less available height). 13295 * 13296 * @param minHeight The minimum height the view will try to be. 13297 */ 13298 public void setMinimumHeight(int minHeight) { 13299 mMinHeight = minHeight; 13300 } 13301 13302 /** 13303 * Sets the minimum width of the view. It is not guaranteed the view will 13304 * be able to achieve this minimum width (for example, if its parent layout 13305 * constrains it with less available width). 13306 * 13307 * @param minWidth The minimum width the view will try to be. 13308 */ 13309 public void setMinimumWidth(int minWidth) { 13310 mMinWidth = minWidth; 13311 } 13312 13313 /** 13314 * Get the animation currently associated with this view. 13315 * 13316 * @return The animation that is currently playing or 13317 * scheduled to play for this view. 13318 */ 13319 public Animation getAnimation() { 13320 return mCurrentAnimation; 13321 } 13322 13323 /** 13324 * Start the specified animation now. 13325 * 13326 * @param animation the animation to start now 13327 */ 13328 public void startAnimation(Animation animation) { 13329 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 13330 setAnimation(animation); 13331 invalidateParentCaches(); 13332 invalidate(true); 13333 } 13334 13335 /** 13336 * Cancels any animations for this view. 13337 */ 13338 public void clearAnimation() { 13339 if (mCurrentAnimation != null) { 13340 mCurrentAnimation.detach(); 13341 } 13342 mCurrentAnimation = null; 13343 invalidateParentIfNeeded(); 13344 } 13345 13346 /** 13347 * Sets the next animation to play for this view. 13348 * If you want the animation to play immediately, use 13349 * startAnimation. This method provides allows fine-grained 13350 * control over the start time and invalidation, but you 13351 * must make sure that 1) the animation has a start time set, and 13352 * 2) the view will be invalidated when the animation is supposed to 13353 * start. 13354 * 13355 * @param animation The next animation, or null. 13356 */ 13357 public void setAnimation(Animation animation) { 13358 mCurrentAnimation = animation; 13359 if (animation != null) { 13360 animation.reset(); 13361 } 13362 } 13363 13364 /** 13365 * Invoked by a parent ViewGroup to notify the start of the animation 13366 * currently associated with this view. If you override this method, 13367 * always call super.onAnimationStart(); 13368 * 13369 * @see #setAnimation(android.view.animation.Animation) 13370 * @see #getAnimation() 13371 */ 13372 protected void onAnimationStart() { 13373 mPrivateFlags |= ANIMATION_STARTED; 13374 } 13375 13376 /** 13377 * Invoked by a parent ViewGroup to notify the end of the animation 13378 * currently associated with this view. If you override this method, 13379 * always call super.onAnimationEnd(); 13380 * 13381 * @see #setAnimation(android.view.animation.Animation) 13382 * @see #getAnimation() 13383 */ 13384 protected void onAnimationEnd() { 13385 mPrivateFlags &= ~ANIMATION_STARTED; 13386 } 13387 13388 /** 13389 * Invoked if there is a Transform that involves alpha. Subclass that can 13390 * draw themselves with the specified alpha should return true, and then 13391 * respect that alpha when their onDraw() is called. If this returns false 13392 * then the view may be redirected to draw into an offscreen buffer to 13393 * fulfill the request, which will look fine, but may be slower than if the 13394 * subclass handles it internally. The default implementation returns false. 13395 * 13396 * @param alpha The alpha (0..255) to apply to the view's drawing 13397 * @return true if the view can draw with the specified alpha. 13398 */ 13399 protected boolean onSetAlpha(int alpha) { 13400 return false; 13401 } 13402 13403 /** 13404 * This is used by the RootView to perform an optimization when 13405 * the view hierarchy contains one or several SurfaceView. 13406 * SurfaceView is always considered transparent, but its children are not, 13407 * therefore all View objects remove themselves from the global transparent 13408 * region (passed as a parameter to this function). 13409 * 13410 * @param region The transparent region for this ViewAncestor (window). 13411 * 13412 * @return Returns true if the effective visibility of the view at this 13413 * point is opaque, regardless of the transparent region; returns false 13414 * if it is possible for underlying windows to be seen behind the view. 13415 * 13416 * {@hide} 13417 */ 13418 public boolean gatherTransparentRegion(Region region) { 13419 final AttachInfo attachInfo = mAttachInfo; 13420 if (region != null && attachInfo != null) { 13421 final int pflags = mPrivateFlags; 13422 if ((pflags & SKIP_DRAW) == 0) { 13423 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 13424 // remove it from the transparent region. 13425 final int[] location = attachInfo.mTransparentLocation; 13426 getLocationInWindow(location); 13427 region.op(location[0], location[1], location[0] + mRight - mLeft, 13428 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 13429 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 13430 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 13431 // exists, so we remove the background drawable's non-transparent 13432 // parts from this transparent region. 13433 applyDrawableToTransparentRegion(mBGDrawable, region); 13434 } 13435 } 13436 return true; 13437 } 13438 13439 /** 13440 * Play a sound effect for this view. 13441 * 13442 * <p>The framework will play sound effects for some built in actions, such as 13443 * clicking, but you may wish to play these effects in your widget, 13444 * for instance, for internal navigation. 13445 * 13446 * <p>The sound effect will only be played if sound effects are enabled by the user, and 13447 * {@link #isSoundEffectsEnabled()} is true. 13448 * 13449 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 13450 */ 13451 public void playSoundEffect(int soundConstant) { 13452 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 13453 return; 13454 } 13455 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 13456 } 13457 13458 /** 13459 * BZZZTT!!1! 13460 * 13461 * <p>Provide haptic feedback to the user for this view. 13462 * 13463 * <p>The framework will provide haptic feedback for some built in actions, 13464 * such as long presses, but you may wish to provide feedback for your 13465 * own widget. 13466 * 13467 * <p>The feedback will only be performed if 13468 * {@link #isHapticFeedbackEnabled()} is true. 13469 * 13470 * @param feedbackConstant One of the constants defined in 13471 * {@link HapticFeedbackConstants} 13472 */ 13473 public boolean performHapticFeedback(int feedbackConstant) { 13474 return performHapticFeedback(feedbackConstant, 0); 13475 } 13476 13477 /** 13478 * BZZZTT!!1! 13479 * 13480 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 13481 * 13482 * @param feedbackConstant One of the constants defined in 13483 * {@link HapticFeedbackConstants} 13484 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 13485 */ 13486 public boolean performHapticFeedback(int feedbackConstant, int flags) { 13487 if (mAttachInfo == null) { 13488 return false; 13489 } 13490 //noinspection SimplifiableIfStatement 13491 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 13492 && !isHapticFeedbackEnabled()) { 13493 return false; 13494 } 13495 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 13496 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 13497 } 13498 13499 /** 13500 * Request that the visibility of the status bar be changed. 13501 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13502 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13503 */ 13504 public void setSystemUiVisibility(int visibility) { 13505 if (visibility != mSystemUiVisibility) { 13506 mSystemUiVisibility = visibility; 13507 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 13508 mParent.recomputeViewAttributes(this); 13509 } 13510 } 13511 } 13512 13513 /** 13514 * Returns the status bar visibility that this view has requested. 13515 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13516 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13517 */ 13518 public int getSystemUiVisibility() { 13519 return mSystemUiVisibility; 13520 } 13521 13522 /** 13523 * Set a listener to receive callbacks when the visibility of the system bar changes. 13524 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 13525 */ 13526 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 13527 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 13528 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 13529 mParent.recomputeViewAttributes(this); 13530 } 13531 } 13532 13533 /** 13534 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 13535 * the view hierarchy. 13536 */ 13537 public void dispatchSystemUiVisibilityChanged(int visibility) { 13538 ListenerInfo li = mListenerInfo; 13539 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 13540 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 13541 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 13542 } 13543 } 13544 13545 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 13546 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 13547 if (val != mSystemUiVisibility) { 13548 setSystemUiVisibility(val); 13549 } 13550 } 13551 13552 /** 13553 * Creates an image that the system displays during the drag and drop 13554 * operation. This is called a "drag shadow". The default implementation 13555 * for a DragShadowBuilder based on a View returns an image that has exactly the same 13556 * appearance as the given View. The default also positions the center of the drag shadow 13557 * directly under the touch point. If no View is provided (the constructor with no parameters 13558 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 13559 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 13560 * default is an invisible drag shadow. 13561 * <p> 13562 * You are not required to use the View you provide to the constructor as the basis of the 13563 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 13564 * anything you want as the drag shadow. 13565 * </p> 13566 * <p> 13567 * You pass a DragShadowBuilder object to the system when you start the drag. The system 13568 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 13569 * size and position of the drag shadow. It uses this data to construct a 13570 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 13571 * so that your application can draw the shadow image in the Canvas. 13572 * </p> 13573 * 13574 * <div class="special reference"> 13575 * <h3>Developer Guides</h3> 13576 * <p>For a guide to implementing drag and drop features, read the 13577 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 13578 * </div> 13579 */ 13580 public static class DragShadowBuilder { 13581 private final WeakReference<View> mView; 13582 13583 /** 13584 * Constructs a shadow image builder based on a View. By default, the resulting drag 13585 * shadow will have the same appearance and dimensions as the View, with the touch point 13586 * over the center of the View. 13587 * @param view A View. Any View in scope can be used. 13588 */ 13589 public DragShadowBuilder(View view) { 13590 mView = new WeakReference<View>(view); 13591 } 13592 13593 /** 13594 * Construct a shadow builder object with no associated View. This 13595 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 13596 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 13597 * to supply the drag shadow's dimensions and appearance without 13598 * reference to any View object. If they are not overridden, then the result is an 13599 * invisible drag shadow. 13600 */ 13601 public DragShadowBuilder() { 13602 mView = new WeakReference<View>(null); 13603 } 13604 13605 /** 13606 * Returns the View object that had been passed to the 13607 * {@link #View.DragShadowBuilder(View)} 13608 * constructor. If that View parameter was {@code null} or if the 13609 * {@link #View.DragShadowBuilder()} 13610 * constructor was used to instantiate the builder object, this method will return 13611 * null. 13612 * 13613 * @return The View object associate with this builder object. 13614 */ 13615 @SuppressWarnings({"JavadocReference"}) 13616 final public View getView() { 13617 return mView.get(); 13618 } 13619 13620 /** 13621 * Provides the metrics for the shadow image. These include the dimensions of 13622 * the shadow image, and the point within that shadow that should 13623 * be centered under the touch location while dragging. 13624 * <p> 13625 * The default implementation sets the dimensions of the shadow to be the 13626 * same as the dimensions of the View itself and centers the shadow under 13627 * the touch point. 13628 * </p> 13629 * 13630 * @param shadowSize A {@link android.graphics.Point} containing the width and height 13631 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 13632 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 13633 * image. 13634 * 13635 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 13636 * shadow image that should be underneath the touch point during the drag and drop 13637 * operation. Your application must set {@link android.graphics.Point#x} to the 13638 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 13639 */ 13640 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 13641 final View view = mView.get(); 13642 if (view != null) { 13643 shadowSize.set(view.getWidth(), view.getHeight()); 13644 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 13645 } else { 13646 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 13647 } 13648 } 13649 13650 /** 13651 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 13652 * based on the dimensions it received from the 13653 * {@link #onProvideShadowMetrics(Point, Point)} callback. 13654 * 13655 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 13656 */ 13657 public void onDrawShadow(Canvas canvas) { 13658 final View view = mView.get(); 13659 if (view != null) { 13660 view.draw(canvas); 13661 } else { 13662 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 13663 } 13664 } 13665 } 13666 13667 /** 13668 * Starts a drag and drop operation. When your application calls this method, it passes a 13669 * {@link android.view.View.DragShadowBuilder} object to the system. The 13670 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 13671 * to get metrics for the drag shadow, and then calls the object's 13672 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 13673 * <p> 13674 * Once the system has the drag shadow, it begins the drag and drop operation by sending 13675 * drag events to all the View objects in your application that are currently visible. It does 13676 * this either by calling the View object's drag listener (an implementation of 13677 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 13678 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 13679 * Both are passed a {@link android.view.DragEvent} object that has a 13680 * {@link android.view.DragEvent#getAction()} value of 13681 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 13682 * </p> 13683 * <p> 13684 * Your application can invoke startDrag() on any attached View object. The View object does not 13685 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 13686 * be related to the View the user selected for dragging. 13687 * </p> 13688 * @param data A {@link android.content.ClipData} object pointing to the data to be 13689 * transferred by the drag and drop operation. 13690 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 13691 * drag shadow. 13692 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 13693 * drop operation. This Object is put into every DragEvent object sent by the system during the 13694 * current drag. 13695 * <p> 13696 * myLocalState is a lightweight mechanism for the sending information from the dragged View 13697 * to the target Views. For example, it can contain flags that differentiate between a 13698 * a copy operation and a move operation. 13699 * </p> 13700 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 13701 * so the parameter should be set to 0. 13702 * @return {@code true} if the method completes successfully, or 13703 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 13704 * do a drag, and so no drag operation is in progress. 13705 */ 13706 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 13707 Object myLocalState, int flags) { 13708 if (ViewDebug.DEBUG_DRAG) { 13709 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 13710 } 13711 boolean okay = false; 13712 13713 Point shadowSize = new Point(); 13714 Point shadowTouchPoint = new Point(); 13715 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 13716 13717 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 13718 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 13719 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 13720 } 13721 13722 if (ViewDebug.DEBUG_DRAG) { 13723 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 13724 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 13725 } 13726 Surface surface = new Surface(); 13727 try { 13728 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 13729 flags, shadowSize.x, shadowSize.y, surface); 13730 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 13731 + " surface=" + surface); 13732 if (token != null) { 13733 Canvas canvas = surface.lockCanvas(null); 13734 try { 13735 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 13736 shadowBuilder.onDrawShadow(canvas); 13737 } finally { 13738 surface.unlockCanvasAndPost(canvas); 13739 } 13740 13741 final ViewRootImpl root = getViewRootImpl(); 13742 13743 // Cache the local state object for delivery with DragEvents 13744 root.setLocalDragState(myLocalState); 13745 13746 // repurpose 'shadowSize' for the last touch point 13747 root.getLastTouchPoint(shadowSize); 13748 13749 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 13750 shadowSize.x, shadowSize.y, 13751 shadowTouchPoint.x, shadowTouchPoint.y, data); 13752 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 13753 13754 // Off and running! Release our local surface instance; the drag 13755 // shadow surface is now managed by the system process. 13756 surface.release(); 13757 } 13758 } catch (Exception e) { 13759 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 13760 surface.destroy(); 13761 } 13762 13763 return okay; 13764 } 13765 13766 /** 13767 * Handles drag events sent by the system following a call to 13768 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 13769 *<p> 13770 * When the system calls this method, it passes a 13771 * {@link android.view.DragEvent} object. A call to 13772 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 13773 * in DragEvent. The method uses these to determine what is happening in the drag and drop 13774 * operation. 13775 * @param event The {@link android.view.DragEvent} sent by the system. 13776 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 13777 * in DragEvent, indicating the type of drag event represented by this object. 13778 * @return {@code true} if the method was successful, otherwise {@code false}. 13779 * <p> 13780 * The method should return {@code true} in response to an action type of 13781 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 13782 * operation. 13783 * </p> 13784 * <p> 13785 * The method should also return {@code true} in response to an action type of 13786 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 13787 * {@code false} if it didn't. 13788 * </p> 13789 */ 13790 public boolean onDragEvent(DragEvent event) { 13791 return false; 13792 } 13793 13794 /** 13795 * Detects if this View is enabled and has a drag event listener. 13796 * If both are true, then it calls the drag event listener with the 13797 * {@link android.view.DragEvent} it received. If the drag event listener returns 13798 * {@code true}, then dispatchDragEvent() returns {@code true}. 13799 * <p> 13800 * For all other cases, the method calls the 13801 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 13802 * method and returns its result. 13803 * </p> 13804 * <p> 13805 * This ensures that a drag event is always consumed, even if the View does not have a drag 13806 * event listener. However, if the View has a listener and the listener returns true, then 13807 * onDragEvent() is not called. 13808 * </p> 13809 */ 13810 public boolean dispatchDragEvent(DragEvent event) { 13811 //noinspection SimplifiableIfStatement 13812 ListenerInfo li = mListenerInfo; 13813 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 13814 && li.mOnDragListener.onDrag(this, event)) { 13815 return true; 13816 } 13817 return onDragEvent(event); 13818 } 13819 13820 boolean canAcceptDrag() { 13821 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 13822 } 13823 13824 /** 13825 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 13826 * it is ever exposed at all. 13827 * @hide 13828 */ 13829 public void onCloseSystemDialogs(String reason) { 13830 } 13831 13832 /** 13833 * Given a Drawable whose bounds have been set to draw into this view, 13834 * update a Region being computed for 13835 * {@link #gatherTransparentRegion(android.graphics.Region)} so 13836 * that any non-transparent parts of the Drawable are removed from the 13837 * given transparent region. 13838 * 13839 * @param dr The Drawable whose transparency is to be applied to the region. 13840 * @param region A Region holding the current transparency information, 13841 * where any parts of the region that are set are considered to be 13842 * transparent. On return, this region will be modified to have the 13843 * transparency information reduced by the corresponding parts of the 13844 * Drawable that are not transparent. 13845 * {@hide} 13846 */ 13847 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 13848 if (DBG) { 13849 Log.i("View", "Getting transparent region for: " + this); 13850 } 13851 final Region r = dr.getTransparentRegion(); 13852 final Rect db = dr.getBounds(); 13853 final AttachInfo attachInfo = mAttachInfo; 13854 if (r != null && attachInfo != null) { 13855 final int w = getRight()-getLeft(); 13856 final int h = getBottom()-getTop(); 13857 if (db.left > 0) { 13858 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 13859 r.op(0, 0, db.left, h, Region.Op.UNION); 13860 } 13861 if (db.right < w) { 13862 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 13863 r.op(db.right, 0, w, h, Region.Op.UNION); 13864 } 13865 if (db.top > 0) { 13866 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 13867 r.op(0, 0, w, db.top, Region.Op.UNION); 13868 } 13869 if (db.bottom < h) { 13870 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 13871 r.op(0, db.bottom, w, h, Region.Op.UNION); 13872 } 13873 final int[] location = attachInfo.mTransparentLocation; 13874 getLocationInWindow(location); 13875 r.translate(location[0], location[1]); 13876 region.op(r, Region.Op.INTERSECT); 13877 } else { 13878 region.op(db, Region.Op.DIFFERENCE); 13879 } 13880 } 13881 13882 private void checkForLongClick(int delayOffset) { 13883 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 13884 mHasPerformedLongPress = false; 13885 13886 if (mPendingCheckForLongPress == null) { 13887 mPendingCheckForLongPress = new CheckForLongPress(); 13888 } 13889 mPendingCheckForLongPress.rememberWindowAttachCount(); 13890 postDelayed(mPendingCheckForLongPress, 13891 ViewConfiguration.getLongPressTimeout() - delayOffset); 13892 } 13893 } 13894 13895 /** 13896 * Inflate a view from an XML resource. This convenience method wraps the {@link 13897 * LayoutInflater} class, which provides a full range of options for view inflation. 13898 * 13899 * @param context The Context object for your activity or application. 13900 * @param resource The resource ID to inflate 13901 * @param root A view group that will be the parent. Used to properly inflate the 13902 * layout_* parameters. 13903 * @see LayoutInflater 13904 */ 13905 public static View inflate(Context context, int resource, ViewGroup root) { 13906 LayoutInflater factory = LayoutInflater.from(context); 13907 return factory.inflate(resource, root); 13908 } 13909 13910 /** 13911 * Scroll the view with standard behavior for scrolling beyond the normal 13912 * content boundaries. Views that call this method should override 13913 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 13914 * results of an over-scroll operation. 13915 * 13916 * Views can use this method to handle any touch or fling-based scrolling. 13917 * 13918 * @param deltaX Change in X in pixels 13919 * @param deltaY Change in Y in pixels 13920 * @param scrollX Current X scroll value in pixels before applying deltaX 13921 * @param scrollY Current Y scroll value in pixels before applying deltaY 13922 * @param scrollRangeX Maximum content scroll range along the X axis 13923 * @param scrollRangeY Maximum content scroll range along the Y axis 13924 * @param maxOverScrollX Number of pixels to overscroll by in either direction 13925 * along the X axis. 13926 * @param maxOverScrollY Number of pixels to overscroll by in either direction 13927 * along the Y axis. 13928 * @param isTouchEvent true if this scroll operation is the result of a touch event. 13929 * @return true if scrolling was clamped to an over-scroll boundary along either 13930 * axis, false otherwise. 13931 */ 13932 @SuppressWarnings({"UnusedParameters"}) 13933 protected boolean overScrollBy(int deltaX, int deltaY, 13934 int scrollX, int scrollY, 13935 int scrollRangeX, int scrollRangeY, 13936 int maxOverScrollX, int maxOverScrollY, 13937 boolean isTouchEvent) { 13938 final int overScrollMode = mOverScrollMode; 13939 final boolean canScrollHorizontal = 13940 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 13941 final boolean canScrollVertical = 13942 computeVerticalScrollRange() > computeVerticalScrollExtent(); 13943 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 13944 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 13945 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 13946 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 13947 13948 int newScrollX = scrollX + deltaX; 13949 if (!overScrollHorizontal) { 13950 maxOverScrollX = 0; 13951 } 13952 13953 int newScrollY = scrollY + deltaY; 13954 if (!overScrollVertical) { 13955 maxOverScrollY = 0; 13956 } 13957 13958 // Clamp values if at the limits and record 13959 final int left = -maxOverScrollX; 13960 final int right = maxOverScrollX + scrollRangeX; 13961 final int top = -maxOverScrollY; 13962 final int bottom = maxOverScrollY + scrollRangeY; 13963 13964 boolean clampedX = false; 13965 if (newScrollX > right) { 13966 newScrollX = right; 13967 clampedX = true; 13968 } else if (newScrollX < left) { 13969 newScrollX = left; 13970 clampedX = true; 13971 } 13972 13973 boolean clampedY = false; 13974 if (newScrollY > bottom) { 13975 newScrollY = bottom; 13976 clampedY = true; 13977 } else if (newScrollY < top) { 13978 newScrollY = top; 13979 clampedY = true; 13980 } 13981 13982 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 13983 13984 return clampedX || clampedY; 13985 } 13986 13987 /** 13988 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 13989 * respond to the results of an over-scroll operation. 13990 * 13991 * @param scrollX New X scroll value in pixels 13992 * @param scrollY New Y scroll value in pixels 13993 * @param clampedX True if scrollX was clamped to an over-scroll boundary 13994 * @param clampedY True if scrollY was clamped to an over-scroll boundary 13995 */ 13996 protected void onOverScrolled(int scrollX, int scrollY, 13997 boolean clampedX, boolean clampedY) { 13998 // Intentionally empty. 13999 } 14000 14001 /** 14002 * Returns the over-scroll mode for this view. The result will be 14003 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 14004 * (allow over-scrolling only if the view content is larger than the container), 14005 * or {@link #OVER_SCROLL_NEVER}. 14006 * 14007 * @return This view's over-scroll mode. 14008 */ 14009 public int getOverScrollMode() { 14010 return mOverScrollMode; 14011 } 14012 14013 /** 14014 * Set the over-scroll mode for this view. Valid over-scroll modes are 14015 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 14016 * (allow over-scrolling only if the view content is larger than the container), 14017 * or {@link #OVER_SCROLL_NEVER}. 14018 * 14019 * Setting the over-scroll mode of a view will have an effect only if the 14020 * view is capable of scrolling. 14021 * 14022 * @param overScrollMode The new over-scroll mode for this view. 14023 */ 14024 public void setOverScrollMode(int overScrollMode) { 14025 if (overScrollMode != OVER_SCROLL_ALWAYS && 14026 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 14027 overScrollMode != OVER_SCROLL_NEVER) { 14028 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 14029 } 14030 mOverScrollMode = overScrollMode; 14031 } 14032 14033 /** 14034 * Gets a scale factor that determines the distance the view should scroll 14035 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 14036 * @return The vertical scroll scale factor. 14037 * @hide 14038 */ 14039 protected float getVerticalScrollFactor() { 14040 if (mVerticalScrollFactor == 0) { 14041 TypedValue outValue = new TypedValue(); 14042 if (!mContext.getTheme().resolveAttribute( 14043 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 14044 throw new IllegalStateException( 14045 "Expected theme to define listPreferredItemHeight."); 14046 } 14047 mVerticalScrollFactor = outValue.getDimension( 14048 mContext.getResources().getDisplayMetrics()); 14049 } 14050 return mVerticalScrollFactor; 14051 } 14052 14053 /** 14054 * Gets a scale factor that determines the distance the view should scroll 14055 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 14056 * @return The horizontal scroll scale factor. 14057 * @hide 14058 */ 14059 protected float getHorizontalScrollFactor() { 14060 // TODO: Should use something else. 14061 return getVerticalScrollFactor(); 14062 } 14063 14064 /** 14065 * Return the value specifying the text direction or policy that was set with 14066 * {@link #setTextDirection(int)}. 14067 * 14068 * @return the defined text direction. It can be one of: 14069 * 14070 * {@link #TEXT_DIRECTION_INHERIT}, 14071 * {@link #TEXT_DIRECTION_FIRST_STRONG} 14072 * {@link #TEXT_DIRECTION_ANY_RTL}, 14073 * {@link #TEXT_DIRECTION_LTR}, 14074 * {@link #TEXT_DIRECTION_RTL}, 14075 * {@link #TEXT_DIRECTION_LOCALE}, 14076 * 14077 */ 14078 public int getTextDirection() { 14079 return mTextDirection; 14080 } 14081 14082 /** 14083 * Set the text direction. 14084 * 14085 * @param textDirection the direction to set. Should be one of: 14086 * 14087 * {@link #TEXT_DIRECTION_INHERIT}, 14088 * {@link #TEXT_DIRECTION_FIRST_STRONG} 14089 * {@link #TEXT_DIRECTION_ANY_RTL}, 14090 * {@link #TEXT_DIRECTION_LTR}, 14091 * {@link #TEXT_DIRECTION_RTL}, 14092 * {@link #TEXT_DIRECTION_LOCALE}, 14093 * 14094 */ 14095 public void setTextDirection(int textDirection) { 14096 if (textDirection != mTextDirection) { 14097 mTextDirection = textDirection; 14098 resetResolvedTextDirection(); 14099 requestLayout(); 14100 } 14101 } 14102 14103 /** 14104 * Return the resolved text direction. 14105 * 14106 * @return the resolved text direction. Return one of: 14107 * 14108 * {@link #TEXT_DIRECTION_FIRST_STRONG} 14109 * {@link #TEXT_DIRECTION_ANY_RTL}, 14110 * {@link #TEXT_DIRECTION_LTR}, 14111 * {@link #TEXT_DIRECTION_RTL}, 14112 * {@link #TEXT_DIRECTION_LOCALE}, 14113 * 14114 */ 14115 public int getResolvedTextDirection() { 14116 if (mResolvedTextDirection == TEXT_DIRECTION_INHERIT) { 14117 resolveTextDirection(); 14118 } 14119 return mResolvedTextDirection; 14120 } 14121 14122 /** 14123 * Resolve the text direction. 14124 * 14125 */ 14126 protected void resolveTextDirection() { 14127 if (mTextDirection != TEXT_DIRECTION_INHERIT) { 14128 mResolvedTextDirection = mTextDirection; 14129 return; 14130 } 14131 if (mParent != null && mParent instanceof ViewGroup) { 14132 mResolvedTextDirection = ((ViewGroup) mParent).getResolvedTextDirection(); 14133 return; 14134 } 14135 mResolvedTextDirection = TEXT_DIRECTION_FIRST_STRONG; 14136 } 14137 14138 /** 14139 * Reset resolved text direction. Will be resolved during a call to getResolvedTextDirection(). 14140 * 14141 */ 14142 protected void resetResolvedTextDirection() { 14143 mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 14144 } 14145 14146 // 14147 // Properties 14148 // 14149 /** 14150 * A Property wrapper around the <code>alpha</code> functionality handled by the 14151 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 14152 */ 14153 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 14154 @Override 14155 public void setValue(View object, float value) { 14156 object.setAlpha(value); 14157 } 14158 14159 @Override 14160 public Float get(View object) { 14161 return object.getAlpha(); 14162 } 14163 }; 14164 14165 /** 14166 * A Property wrapper around the <code>translationX</code> functionality handled by the 14167 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 14168 */ 14169 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 14170 @Override 14171 public void setValue(View object, float value) { 14172 object.setTranslationX(value); 14173 } 14174 14175 @Override 14176 public Float get(View object) { 14177 return object.getTranslationX(); 14178 } 14179 }; 14180 14181 /** 14182 * A Property wrapper around the <code>translationY</code> functionality handled by the 14183 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 14184 */ 14185 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 14186 @Override 14187 public void setValue(View object, float value) { 14188 object.setTranslationY(value); 14189 } 14190 14191 @Override 14192 public Float get(View object) { 14193 return object.getTranslationY(); 14194 } 14195 }; 14196 14197 /** 14198 * A Property wrapper around the <code>x</code> functionality handled by the 14199 * {@link View#setX(float)} and {@link View#getX()} methods. 14200 */ 14201 public static final Property<View, Float> X = new FloatProperty<View>("x") { 14202 @Override 14203 public void setValue(View object, float value) { 14204 object.setX(value); 14205 } 14206 14207 @Override 14208 public Float get(View object) { 14209 return object.getX(); 14210 } 14211 }; 14212 14213 /** 14214 * A Property wrapper around the <code>y</code> functionality handled by the 14215 * {@link View#setY(float)} and {@link View#getY()} methods. 14216 */ 14217 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 14218 @Override 14219 public void setValue(View object, float value) { 14220 object.setY(value); 14221 } 14222 14223 @Override 14224 public Float get(View object) { 14225 return object.getY(); 14226 } 14227 }; 14228 14229 /** 14230 * A Property wrapper around the <code>rotation</code> functionality handled by the 14231 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 14232 */ 14233 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 14234 @Override 14235 public void setValue(View object, float value) { 14236 object.setRotation(value); 14237 } 14238 14239 @Override 14240 public Float get(View object) { 14241 return object.getRotation(); 14242 } 14243 }; 14244 14245 /** 14246 * A Property wrapper around the <code>rotationX</code> functionality handled by the 14247 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 14248 */ 14249 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 14250 @Override 14251 public void setValue(View object, float value) { 14252 object.setRotationX(value); 14253 } 14254 14255 @Override 14256 public Float get(View object) { 14257 return object.getRotationX(); 14258 } 14259 }; 14260 14261 /** 14262 * A Property wrapper around the <code>rotationY</code> functionality handled by the 14263 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 14264 */ 14265 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 14266 @Override 14267 public void setValue(View object, float value) { 14268 object.setRotationY(value); 14269 } 14270 14271 @Override 14272 public Float get(View object) { 14273 return object.getRotationY(); 14274 } 14275 }; 14276 14277 /** 14278 * A Property wrapper around the <code>scaleX</code> functionality handled by the 14279 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 14280 */ 14281 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 14282 @Override 14283 public void setValue(View object, float value) { 14284 object.setScaleX(value); 14285 } 14286 14287 @Override 14288 public Float get(View object) { 14289 return object.getScaleX(); 14290 } 14291 }; 14292 14293 /** 14294 * A Property wrapper around the <code>scaleY</code> functionality handled by the 14295 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 14296 */ 14297 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 14298 @Override 14299 public void setValue(View object, float value) { 14300 object.setScaleY(value); 14301 } 14302 14303 @Override 14304 public Float get(View object) { 14305 return object.getScaleY(); 14306 } 14307 }; 14308 14309 /** 14310 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 14311 * Each MeasureSpec represents a requirement for either the width or the height. 14312 * A MeasureSpec is comprised of a size and a mode. There are three possible 14313 * modes: 14314 * <dl> 14315 * <dt>UNSPECIFIED</dt> 14316 * <dd> 14317 * The parent has not imposed any constraint on the child. It can be whatever size 14318 * it wants. 14319 * </dd> 14320 * 14321 * <dt>EXACTLY</dt> 14322 * <dd> 14323 * The parent has determined an exact size for the child. The child is going to be 14324 * given those bounds regardless of how big it wants to be. 14325 * </dd> 14326 * 14327 * <dt>AT_MOST</dt> 14328 * <dd> 14329 * The child can be as large as it wants up to the specified size. 14330 * </dd> 14331 * </dl> 14332 * 14333 * MeasureSpecs are implemented as ints to reduce object allocation. This class 14334 * is provided to pack and unpack the <size, mode> tuple into the int. 14335 */ 14336 public static class MeasureSpec { 14337 private static final int MODE_SHIFT = 30; 14338 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 14339 14340 /** 14341 * Measure specification mode: The parent has not imposed any constraint 14342 * on the child. It can be whatever size it wants. 14343 */ 14344 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 14345 14346 /** 14347 * Measure specification mode: The parent has determined an exact size 14348 * for the child. The child is going to be given those bounds regardless 14349 * of how big it wants to be. 14350 */ 14351 public static final int EXACTLY = 1 << MODE_SHIFT; 14352 14353 /** 14354 * Measure specification mode: The child can be as large as it wants up 14355 * to the specified size. 14356 */ 14357 public static final int AT_MOST = 2 << MODE_SHIFT; 14358 14359 /** 14360 * Creates a measure specification based on the supplied size and mode. 14361 * 14362 * The mode must always be one of the following: 14363 * <ul> 14364 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 14365 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 14366 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 14367 * </ul> 14368 * 14369 * @param size the size of the measure specification 14370 * @param mode the mode of the measure specification 14371 * @return the measure specification based on size and mode 14372 */ 14373 public static int makeMeasureSpec(int size, int mode) { 14374 return size + mode; 14375 } 14376 14377 /** 14378 * Extracts the mode from the supplied measure specification. 14379 * 14380 * @param measureSpec the measure specification to extract the mode from 14381 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 14382 * {@link android.view.View.MeasureSpec#AT_MOST} or 14383 * {@link android.view.View.MeasureSpec#EXACTLY} 14384 */ 14385 public static int getMode(int measureSpec) { 14386 return (measureSpec & MODE_MASK); 14387 } 14388 14389 /** 14390 * Extracts the size from the supplied measure specification. 14391 * 14392 * @param measureSpec the measure specification to extract the size from 14393 * @return the size in pixels defined in the supplied measure specification 14394 */ 14395 public static int getSize(int measureSpec) { 14396 return (measureSpec & ~MODE_MASK); 14397 } 14398 14399 /** 14400 * Returns a String representation of the specified measure 14401 * specification. 14402 * 14403 * @param measureSpec the measure specification to convert to a String 14404 * @return a String with the following format: "MeasureSpec: MODE SIZE" 14405 */ 14406 public static String toString(int measureSpec) { 14407 int mode = getMode(measureSpec); 14408 int size = getSize(measureSpec); 14409 14410 StringBuilder sb = new StringBuilder("MeasureSpec: "); 14411 14412 if (mode == UNSPECIFIED) 14413 sb.append("UNSPECIFIED "); 14414 else if (mode == EXACTLY) 14415 sb.append("EXACTLY "); 14416 else if (mode == AT_MOST) 14417 sb.append("AT_MOST "); 14418 else 14419 sb.append(mode).append(" "); 14420 14421 sb.append(size); 14422 return sb.toString(); 14423 } 14424 } 14425 14426 class CheckForLongPress implements Runnable { 14427 14428 private int mOriginalWindowAttachCount; 14429 14430 public void run() { 14431 if (isPressed() && (mParent != null) 14432 && mOriginalWindowAttachCount == mWindowAttachCount) { 14433 if (performLongClick()) { 14434 mHasPerformedLongPress = true; 14435 } 14436 } 14437 } 14438 14439 public void rememberWindowAttachCount() { 14440 mOriginalWindowAttachCount = mWindowAttachCount; 14441 } 14442 } 14443 14444 private final class CheckForTap implements Runnable { 14445 public void run() { 14446 mPrivateFlags &= ~PREPRESSED; 14447 mPrivateFlags |= PRESSED; 14448 refreshDrawableState(); 14449 checkForLongClick(ViewConfiguration.getTapTimeout()); 14450 } 14451 } 14452 14453 private final class PerformClick implements Runnable { 14454 public void run() { 14455 performClick(); 14456 } 14457 } 14458 14459 /** @hide */ 14460 public void hackTurnOffWindowResizeAnim(boolean off) { 14461 mAttachInfo.mTurnOffWindowResizeAnim = off; 14462 } 14463 14464 /** 14465 * This method returns a ViewPropertyAnimator object, which can be used to animate 14466 * specific properties on this View. 14467 * 14468 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 14469 */ 14470 public ViewPropertyAnimator animate() { 14471 if (mAnimator == null) { 14472 mAnimator = new ViewPropertyAnimator(this); 14473 } 14474 return mAnimator; 14475 } 14476 14477 /** 14478 * Interface definition for a callback to be invoked when a key event is 14479 * dispatched to this view. The callback will be invoked before the key 14480 * event is given to the view. 14481 */ 14482 public interface OnKeyListener { 14483 /** 14484 * Called when a key is dispatched to a view. This allows listeners to 14485 * get a chance to respond before the target view. 14486 * 14487 * @param v The view the key has been dispatched to. 14488 * @param keyCode The code for the physical key that was pressed 14489 * @param event The KeyEvent object containing full information about 14490 * the event. 14491 * @return True if the listener has consumed the event, false otherwise. 14492 */ 14493 boolean onKey(View v, int keyCode, KeyEvent event); 14494 } 14495 14496 /** 14497 * Interface definition for a callback to be invoked when a touch event is 14498 * dispatched to this view. The callback will be invoked before the touch 14499 * event is given to the view. 14500 */ 14501 public interface OnTouchListener { 14502 /** 14503 * Called when a touch event is dispatched to a view. This allows listeners to 14504 * get a chance to respond before the target view. 14505 * 14506 * @param v The view the touch event has been dispatched to. 14507 * @param event The MotionEvent object containing full information about 14508 * the event. 14509 * @return True if the listener has consumed the event, false otherwise. 14510 */ 14511 boolean onTouch(View v, MotionEvent event); 14512 } 14513 14514 /** 14515 * Interface definition for a callback to be invoked when a hover event is 14516 * dispatched to this view. The callback will be invoked before the hover 14517 * event is given to the view. 14518 */ 14519 public interface OnHoverListener { 14520 /** 14521 * Called when a hover event is dispatched to a view. This allows listeners to 14522 * get a chance to respond before the target view. 14523 * 14524 * @param v The view the hover event has been dispatched to. 14525 * @param event The MotionEvent object containing full information about 14526 * the event. 14527 * @return True if the listener has consumed the event, false otherwise. 14528 */ 14529 boolean onHover(View v, MotionEvent event); 14530 } 14531 14532 /** 14533 * Interface definition for a callback to be invoked when a generic motion event is 14534 * dispatched to this view. The callback will be invoked before the generic motion 14535 * event is given to the view. 14536 */ 14537 public interface OnGenericMotionListener { 14538 /** 14539 * Called when a generic motion event is dispatched to a view. This allows listeners to 14540 * get a chance to respond before the target view. 14541 * 14542 * @param v The view the generic motion event has been dispatched to. 14543 * @param event The MotionEvent object containing full information about 14544 * the event. 14545 * @return True if the listener has consumed the event, false otherwise. 14546 */ 14547 boolean onGenericMotion(View v, MotionEvent event); 14548 } 14549 14550 /** 14551 * Interface definition for a callback to be invoked when a view has been clicked and held. 14552 */ 14553 public interface OnLongClickListener { 14554 /** 14555 * Called when a view has been clicked and held. 14556 * 14557 * @param v The view that was clicked and held. 14558 * 14559 * @return true if the callback consumed the long click, false otherwise. 14560 */ 14561 boolean onLongClick(View v); 14562 } 14563 14564 /** 14565 * Interface definition for a callback to be invoked when a drag is being dispatched 14566 * to this view. The callback will be invoked before the hosting view's own 14567 * onDrag(event) method. If the listener wants to fall back to the hosting view's 14568 * onDrag(event) behavior, it should return 'false' from this callback. 14569 * 14570 * <div class="special reference"> 14571 * <h3>Developer Guides</h3> 14572 * <p>For a guide to implementing drag and drop features, read the 14573 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 14574 * </div> 14575 */ 14576 public interface OnDragListener { 14577 /** 14578 * Called when a drag event is dispatched to a view. This allows listeners 14579 * to get a chance to override base View behavior. 14580 * 14581 * @param v The View that received the drag event. 14582 * @param event The {@link android.view.DragEvent} object for the drag event. 14583 * @return {@code true} if the drag event was handled successfully, or {@code false} 14584 * if the drag event was not handled. Note that {@code false} will trigger the View 14585 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 14586 */ 14587 boolean onDrag(View v, DragEvent event); 14588 } 14589 14590 /** 14591 * Interface definition for a callback to be invoked when the focus state of 14592 * a view changed. 14593 */ 14594 public interface OnFocusChangeListener { 14595 /** 14596 * Called when the focus state of a view has changed. 14597 * 14598 * @param v The view whose state has changed. 14599 * @param hasFocus The new focus state of v. 14600 */ 14601 void onFocusChange(View v, boolean hasFocus); 14602 } 14603 14604 /** 14605 * Interface definition for a callback to be invoked when a view is clicked. 14606 */ 14607 public interface OnClickListener { 14608 /** 14609 * Called when a view has been clicked. 14610 * 14611 * @param v The view that was clicked. 14612 */ 14613 void onClick(View v); 14614 } 14615 14616 /** 14617 * Interface definition for a callback to be invoked when the context menu 14618 * for this view is being built. 14619 */ 14620 public interface OnCreateContextMenuListener { 14621 /** 14622 * Called when the context menu for this view is being built. It is not 14623 * safe to hold onto the menu after this method returns. 14624 * 14625 * @param menu The context menu that is being built 14626 * @param v The view for which the context menu is being built 14627 * @param menuInfo Extra information about the item for which the 14628 * context menu should be shown. This information will vary 14629 * depending on the class of v. 14630 */ 14631 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 14632 } 14633 14634 /** 14635 * Interface definition for a callback to be invoked when the status bar changes 14636 * visibility. This reports <strong>global</strong> changes to the system UI 14637 * state, not just what the application is requesting. 14638 * 14639 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 14640 */ 14641 public interface OnSystemUiVisibilityChangeListener { 14642 /** 14643 * Called when the status bar changes visibility because of a call to 14644 * {@link View#setSystemUiVisibility(int)}. 14645 * 14646 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 14647 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. This tells you the 14648 * <strong>global</strong> state of the UI visibility flags, not what your 14649 * app is currently applying. 14650 */ 14651 public void onSystemUiVisibilityChange(int visibility); 14652 } 14653 14654 /** 14655 * Interface definition for a callback to be invoked when this view is attached 14656 * or detached from its window. 14657 */ 14658 public interface OnAttachStateChangeListener { 14659 /** 14660 * Called when the view is attached to a window. 14661 * @param v The view that was attached 14662 */ 14663 public void onViewAttachedToWindow(View v); 14664 /** 14665 * Called when the view is detached from a window. 14666 * @param v The view that was detached 14667 */ 14668 public void onViewDetachedFromWindow(View v); 14669 } 14670 14671 private final class UnsetPressedState implements Runnable { 14672 public void run() { 14673 setPressed(false); 14674 } 14675 } 14676 14677 /** 14678 * Base class for derived classes that want to save and restore their own 14679 * state in {@link android.view.View#onSaveInstanceState()}. 14680 */ 14681 public static class BaseSavedState extends AbsSavedState { 14682 /** 14683 * Constructor used when reading from a parcel. Reads the state of the superclass. 14684 * 14685 * @param source 14686 */ 14687 public BaseSavedState(Parcel source) { 14688 super(source); 14689 } 14690 14691 /** 14692 * Constructor called by derived classes when creating their SavedState objects 14693 * 14694 * @param superState The state of the superclass of this view 14695 */ 14696 public BaseSavedState(Parcelable superState) { 14697 super(superState); 14698 } 14699 14700 public static final Parcelable.Creator<BaseSavedState> CREATOR = 14701 new Parcelable.Creator<BaseSavedState>() { 14702 public BaseSavedState createFromParcel(Parcel in) { 14703 return new BaseSavedState(in); 14704 } 14705 14706 public BaseSavedState[] newArray(int size) { 14707 return new BaseSavedState[size]; 14708 } 14709 }; 14710 } 14711 14712 /** 14713 * A set of information given to a view when it is attached to its parent 14714 * window. 14715 */ 14716 static class AttachInfo { 14717 interface Callbacks { 14718 void playSoundEffect(int effectId); 14719 boolean performHapticFeedback(int effectId, boolean always); 14720 } 14721 14722 /** 14723 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 14724 * to a Handler. This class contains the target (View) to invalidate and 14725 * the coordinates of the dirty rectangle. 14726 * 14727 * For performance purposes, this class also implements a pool of up to 14728 * POOL_LIMIT objects that get reused. This reduces memory allocations 14729 * whenever possible. 14730 */ 14731 static class InvalidateInfo implements Poolable<InvalidateInfo> { 14732 private static final int POOL_LIMIT = 10; 14733 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 14734 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 14735 public InvalidateInfo newInstance() { 14736 return new InvalidateInfo(); 14737 } 14738 14739 public void onAcquired(InvalidateInfo element) { 14740 } 14741 14742 public void onReleased(InvalidateInfo element) { 14743 element.target = null; 14744 } 14745 }, POOL_LIMIT) 14746 ); 14747 14748 private InvalidateInfo mNext; 14749 private boolean mIsPooled; 14750 14751 View target; 14752 14753 int left; 14754 int top; 14755 int right; 14756 int bottom; 14757 14758 public void setNextPoolable(InvalidateInfo element) { 14759 mNext = element; 14760 } 14761 14762 public InvalidateInfo getNextPoolable() { 14763 return mNext; 14764 } 14765 14766 static InvalidateInfo acquire() { 14767 return sPool.acquire(); 14768 } 14769 14770 void release() { 14771 sPool.release(this); 14772 } 14773 14774 public boolean isPooled() { 14775 return mIsPooled; 14776 } 14777 14778 public void setPooled(boolean isPooled) { 14779 mIsPooled = isPooled; 14780 } 14781 } 14782 14783 final IWindowSession mSession; 14784 14785 final IWindow mWindow; 14786 14787 final IBinder mWindowToken; 14788 14789 final Callbacks mRootCallbacks; 14790 14791 HardwareCanvas mHardwareCanvas; 14792 14793 /** 14794 * The top view of the hierarchy. 14795 */ 14796 View mRootView; 14797 14798 IBinder mPanelParentWindowToken; 14799 Surface mSurface; 14800 14801 boolean mHardwareAccelerated; 14802 boolean mHardwareAccelerationRequested; 14803 HardwareRenderer mHardwareRenderer; 14804 14805 /** 14806 * Scale factor used by the compatibility mode 14807 */ 14808 float mApplicationScale; 14809 14810 /** 14811 * Indicates whether the application is in compatibility mode 14812 */ 14813 boolean mScalingRequired; 14814 14815 /** 14816 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 14817 */ 14818 boolean mTurnOffWindowResizeAnim; 14819 14820 /** 14821 * Left position of this view's window 14822 */ 14823 int mWindowLeft; 14824 14825 /** 14826 * Top position of this view's window 14827 */ 14828 int mWindowTop; 14829 14830 /** 14831 * Indicates whether views need to use 32-bit drawing caches 14832 */ 14833 boolean mUse32BitDrawingCache; 14834 14835 /** 14836 * For windows that are full-screen but using insets to layout inside 14837 * of the screen decorations, these are the current insets for the 14838 * content of the window. 14839 */ 14840 final Rect mContentInsets = new Rect(); 14841 14842 /** 14843 * For windows that are full-screen but using insets to layout inside 14844 * of the screen decorations, these are the current insets for the 14845 * actual visible parts of the window. 14846 */ 14847 final Rect mVisibleInsets = new Rect(); 14848 14849 /** 14850 * The internal insets given by this window. This value is 14851 * supplied by the client (through 14852 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 14853 * be given to the window manager when changed to be used in laying 14854 * out windows behind it. 14855 */ 14856 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 14857 = new ViewTreeObserver.InternalInsetsInfo(); 14858 14859 /** 14860 * All views in the window's hierarchy that serve as scroll containers, 14861 * used to determine if the window can be resized or must be panned 14862 * to adjust for a soft input area. 14863 */ 14864 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 14865 14866 final KeyEvent.DispatcherState mKeyDispatchState 14867 = new KeyEvent.DispatcherState(); 14868 14869 /** 14870 * Indicates whether the view's window currently has the focus. 14871 */ 14872 boolean mHasWindowFocus; 14873 14874 /** 14875 * The current visibility of the window. 14876 */ 14877 int mWindowVisibility; 14878 14879 /** 14880 * Indicates the time at which drawing started to occur. 14881 */ 14882 long mDrawingTime; 14883 14884 /** 14885 * Indicates whether or not ignoring the DIRTY_MASK flags. 14886 */ 14887 boolean mIgnoreDirtyState; 14888 14889 /** 14890 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 14891 * to avoid clearing that flag prematurely. 14892 */ 14893 boolean mSetIgnoreDirtyState = false; 14894 14895 /** 14896 * Indicates whether the view's window is currently in touch mode. 14897 */ 14898 boolean mInTouchMode; 14899 14900 /** 14901 * Indicates that ViewAncestor should trigger a global layout change 14902 * the next time it performs a traversal 14903 */ 14904 boolean mRecomputeGlobalAttributes; 14905 14906 /** 14907 * Always report new attributes at next traversal. 14908 */ 14909 boolean mForceReportNewAttributes; 14910 14911 /** 14912 * Set during a traveral if any views want to keep the screen on. 14913 */ 14914 boolean mKeepScreenOn; 14915 14916 /** 14917 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 14918 */ 14919 int mSystemUiVisibility; 14920 14921 /** 14922 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 14923 * attached. 14924 */ 14925 boolean mHasSystemUiListeners; 14926 14927 /** 14928 * Set if the visibility of any views has changed. 14929 */ 14930 boolean mViewVisibilityChanged; 14931 14932 /** 14933 * Set to true if a view has been scrolled. 14934 */ 14935 boolean mViewScrollChanged; 14936 14937 /** 14938 * Global to the view hierarchy used as a temporary for dealing with 14939 * x/y points in the transparent region computations. 14940 */ 14941 final int[] mTransparentLocation = new int[2]; 14942 14943 /** 14944 * Global to the view hierarchy used as a temporary for dealing with 14945 * x/y points in the ViewGroup.invalidateChild implementation. 14946 */ 14947 final int[] mInvalidateChildLocation = new int[2]; 14948 14949 14950 /** 14951 * Global to the view hierarchy used as a temporary for dealing with 14952 * x/y location when view is transformed. 14953 */ 14954 final float[] mTmpTransformLocation = new float[2]; 14955 14956 /** 14957 * The view tree observer used to dispatch global events like 14958 * layout, pre-draw, touch mode change, etc. 14959 */ 14960 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 14961 14962 /** 14963 * A Canvas used by the view hierarchy to perform bitmap caching. 14964 */ 14965 Canvas mCanvas; 14966 14967 /** 14968 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 14969 * handler can be used to pump events in the UI events queue. 14970 */ 14971 final Handler mHandler; 14972 14973 /** 14974 * Identifier for messages requesting the view to be invalidated. 14975 * Such messages should be sent to {@link #mHandler}. 14976 */ 14977 static final int INVALIDATE_MSG = 0x1; 14978 14979 /** 14980 * Identifier for messages requesting the view to invalidate a region. 14981 * Such messages should be sent to {@link #mHandler}. 14982 */ 14983 static final int INVALIDATE_RECT_MSG = 0x2; 14984 14985 /** 14986 * Temporary for use in computing invalidate rectangles while 14987 * calling up the hierarchy. 14988 */ 14989 final Rect mTmpInvalRect = new Rect(); 14990 14991 /** 14992 * Temporary for use in computing hit areas with transformed views 14993 */ 14994 final RectF mTmpTransformRect = new RectF(); 14995 14996 /** 14997 * Temporary list for use in collecting focusable descendents of a view. 14998 */ 14999 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 15000 15001 /** 15002 * The id of the window for accessibility purposes. 15003 */ 15004 int mAccessibilityWindowId = View.NO_ID; 15005 15006 /** 15007 * Creates a new set of attachment information with the specified 15008 * events handler and thread. 15009 * 15010 * @param handler the events handler the view must use 15011 */ 15012 AttachInfo(IWindowSession session, IWindow window, 15013 Handler handler, Callbacks effectPlayer) { 15014 mSession = session; 15015 mWindow = window; 15016 mWindowToken = window.asBinder(); 15017 mHandler = handler; 15018 mRootCallbacks = effectPlayer; 15019 } 15020 } 15021 15022 /** 15023 * <p>ScrollabilityCache holds various fields used by a View when scrolling 15024 * is supported. This avoids keeping too many unused fields in most 15025 * instances of View.</p> 15026 */ 15027 private static class ScrollabilityCache implements Runnable { 15028 15029 /** 15030 * Scrollbars are not visible 15031 */ 15032 public static final int OFF = 0; 15033 15034 /** 15035 * Scrollbars are visible 15036 */ 15037 public static final int ON = 1; 15038 15039 /** 15040 * Scrollbars are fading away 15041 */ 15042 public static final int FADING = 2; 15043 15044 public boolean fadeScrollBars; 15045 15046 public int fadingEdgeLength; 15047 public int scrollBarDefaultDelayBeforeFade; 15048 public int scrollBarFadeDuration; 15049 15050 public int scrollBarSize; 15051 public ScrollBarDrawable scrollBar; 15052 public float[] interpolatorValues; 15053 public View host; 15054 15055 public final Paint paint; 15056 public final Matrix matrix; 15057 public Shader shader; 15058 15059 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 15060 15061 private static final float[] OPAQUE = { 255 }; 15062 private static final float[] TRANSPARENT = { 0.0f }; 15063 15064 /** 15065 * When fading should start. This time moves into the future every time 15066 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 15067 */ 15068 public long fadeStartTime; 15069 15070 15071 /** 15072 * The current state of the scrollbars: ON, OFF, or FADING 15073 */ 15074 public int state = OFF; 15075 15076 private int mLastColor; 15077 15078 public ScrollabilityCache(ViewConfiguration configuration, View host) { 15079 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 15080 scrollBarSize = configuration.getScaledScrollBarSize(); 15081 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 15082 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 15083 15084 paint = new Paint(); 15085 matrix = new Matrix(); 15086 // use use a height of 1, and then wack the matrix each time we 15087 // actually use it. 15088 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 15089 15090 paint.setShader(shader); 15091 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 15092 this.host = host; 15093 } 15094 15095 public void setFadeColor(int color) { 15096 if (color != 0 && color != mLastColor) { 15097 mLastColor = color; 15098 color |= 0xFF000000; 15099 15100 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 15101 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 15102 15103 paint.setShader(shader); 15104 // Restore the default transfer mode (src_over) 15105 paint.setXfermode(null); 15106 } 15107 } 15108 15109 public void run() { 15110 long now = AnimationUtils.currentAnimationTimeMillis(); 15111 if (now >= fadeStartTime) { 15112 15113 // the animation fades the scrollbars out by changing 15114 // the opacity (alpha) from fully opaque to fully 15115 // transparent 15116 int nextFrame = (int) now; 15117 int framesCount = 0; 15118 15119 Interpolator interpolator = scrollBarInterpolator; 15120 15121 // Start opaque 15122 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 15123 15124 // End transparent 15125 nextFrame += scrollBarFadeDuration; 15126 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 15127 15128 state = FADING; 15129 15130 // Kick off the fade animation 15131 host.invalidate(true); 15132 } 15133 } 15134 } 15135 15136 /** 15137 * Resuable callback for sending 15138 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 15139 */ 15140 private class SendViewScrolledAccessibilityEvent implements Runnable { 15141 public volatile boolean mIsPending; 15142 15143 public void run() { 15144 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 15145 mIsPending = false; 15146 } 15147 } 15148 15149 /** 15150 * <p> 15151 * This class represents a delegate that can be registered in a {@link View} 15152 * to enhance accessibility support via composition rather via inheritance. 15153 * It is specifically targeted to widget developers that extend basic View 15154 * classes i.e. classes in package android.view, that would like their 15155 * applications to be backwards compatible. 15156 * </p> 15157 * <p> 15158 * A scenario in which a developer would like to use an accessibility delegate 15159 * is overriding a method introduced in a later API version then the minimal API 15160 * version supported by the application. For example, the method 15161 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 15162 * in API version 4 when the accessibility APIs were first introduced. If a 15163 * developer would like his application to run on API version 4 devices (assuming 15164 * all other APIs used by the application are version 4 or lower) and take advantage 15165 * of this method, instead of overriding the method which would break the application's 15166 * backwards compatibility, he can override the corresponding method in this 15167 * delegate and register the delegate in the target View if the API version of 15168 * the system is high enough i.e. the API version is same or higher to the API 15169 * version that introduced 15170 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 15171 * </p> 15172 * <p> 15173 * Here is an example implementation: 15174 * </p> 15175 * <code><pre><p> 15176 * if (Build.VERSION.SDK_INT >= 14) { 15177 * // If the API version is equal of higher than the version in 15178 * // which onInitializeAccessibilityNodeInfo was introduced we 15179 * // register a delegate with a customized implementation. 15180 * View view = findViewById(R.id.view_id); 15181 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 15182 * public void onInitializeAccessibilityNodeInfo(View host, 15183 * AccessibilityNodeInfo info) { 15184 * // Let the default implementation populate the info. 15185 * super.onInitializeAccessibilityNodeInfo(host, info); 15186 * // Set some other information. 15187 * info.setEnabled(host.isEnabled()); 15188 * } 15189 * }); 15190 * } 15191 * </code></pre></p> 15192 * <p> 15193 * This delegate contains methods that correspond to the accessibility methods 15194 * in View. If a delegate has been specified the implementation in View hands 15195 * off handling to the corresponding method in this delegate. The default 15196 * implementation the delegate methods behaves exactly as the corresponding 15197 * method in View for the case of no accessibility delegate been set. Hence, 15198 * to customize the behavior of a View method, clients can override only the 15199 * corresponding delegate method without altering the behavior of the rest 15200 * accessibility related methods of the host view. 15201 * </p> 15202 */ 15203 public static class AccessibilityDelegate { 15204 15205 /** 15206 * Sends an accessibility event of the given type. If accessibility is not 15207 * enabled this method has no effect. 15208 * <p> 15209 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 15210 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 15211 * been set. 15212 * </p> 15213 * 15214 * @param host The View hosting the delegate. 15215 * @param eventType The type of the event to send. 15216 * 15217 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 15218 */ 15219 public void sendAccessibilityEvent(View host, int eventType) { 15220 host.sendAccessibilityEventInternal(eventType); 15221 } 15222 15223 /** 15224 * Sends an accessibility event. This method behaves exactly as 15225 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 15226 * empty {@link AccessibilityEvent} and does not perform a check whether 15227 * accessibility is enabled. 15228 * <p> 15229 * The default implementation behaves as 15230 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 15231 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 15232 * the case of no accessibility delegate been set. 15233 * </p> 15234 * 15235 * @param host The View hosting the delegate. 15236 * @param event The event to send. 15237 * 15238 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 15239 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 15240 */ 15241 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 15242 host.sendAccessibilityEventUncheckedInternal(event); 15243 } 15244 15245 /** 15246 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 15247 * to its children for adding their text content to the event. 15248 * <p> 15249 * The default implementation behaves as 15250 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 15251 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 15252 * the case of no accessibility delegate been set. 15253 * </p> 15254 * 15255 * @param host The View hosting the delegate. 15256 * @param event The event. 15257 * @return True if the event population was completed. 15258 * 15259 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 15260 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 15261 */ 15262 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 15263 return host.dispatchPopulateAccessibilityEventInternal(event); 15264 } 15265 15266 /** 15267 * Gives a chance to the host View to populate the accessibility event with its 15268 * text content. 15269 * <p> 15270 * The default implementation behaves as 15271 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 15272 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 15273 * the case of no accessibility delegate been set. 15274 * </p> 15275 * 15276 * @param host The View hosting the delegate. 15277 * @param event The accessibility event which to populate. 15278 * 15279 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 15280 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 15281 */ 15282 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 15283 host.onPopulateAccessibilityEventInternal(event); 15284 } 15285 15286 /** 15287 * Initializes an {@link AccessibilityEvent} with information about the 15288 * the host View which is the event source. 15289 * <p> 15290 * The default implementation behaves as 15291 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 15292 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 15293 * the case of no accessibility delegate been set. 15294 * </p> 15295 * 15296 * @param host The View hosting the delegate. 15297 * @param event The event to initialize. 15298 * 15299 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 15300 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 15301 */ 15302 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 15303 host.onInitializeAccessibilityEventInternal(event); 15304 } 15305 15306 /** 15307 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 15308 * <p> 15309 * The default implementation behaves as 15310 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 15311 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 15312 * the case of no accessibility delegate been set. 15313 * </p> 15314 * 15315 * @param host The View hosting the delegate. 15316 * @param info The instance to initialize. 15317 * 15318 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 15319 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 15320 */ 15321 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 15322 host.onInitializeAccessibilityNodeInfoInternal(info); 15323 } 15324 15325 /** 15326 * Called when a child of the host View has requested sending an 15327 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 15328 * to augment the event. 15329 * <p> 15330 * The default implementation behaves as 15331 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15332 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 15333 * the case of no accessibility delegate been set. 15334 * </p> 15335 * 15336 * @param host The View hosting the delegate. 15337 * @param child The child which requests sending the event. 15338 * @param event The event to be sent. 15339 * @return True if the event should be sent 15340 * 15341 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15342 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15343 */ 15344 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 15345 AccessibilityEvent event) { 15346 return host.onRequestSendAccessibilityEventInternal(child, event); 15347 } 15348 15349 /** 15350 * Gets the provider for managing a virtual view hierarchy rooted at this View 15351 * and reported to {@link android.accessibilityservice.AccessibilityService}s 15352 * that explore the window content. 15353 * <p> 15354 * The default implementation behaves as 15355 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 15356 * the case of no accessibility delegate been set. 15357 * </p> 15358 * 15359 * @return The provider. 15360 * 15361 * @see AccessibilityNodeProvider 15362 */ 15363 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 15364 return null; 15365 } 15366 } 15367} 15368