View.java revision 6704c233390743890d23338a2329dcda5709b810
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.content.ClipData; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Camera; 26import android.graphics.Canvas; 27import android.graphics.Insets; 28import android.graphics.Interpolator; 29import android.graphics.LinearGradient; 30import android.graphics.Matrix; 31import android.graphics.Paint; 32import android.graphics.PixelFormat; 33import android.graphics.Point; 34import android.graphics.PorterDuff; 35import android.graphics.PorterDuffXfermode; 36import android.graphics.Rect; 37import android.graphics.RectF; 38import android.graphics.Region; 39import android.graphics.Shader; 40import android.graphics.drawable.ColorDrawable; 41import android.graphics.drawable.Drawable; 42import android.os.Bundle; 43import android.os.Handler; 44import android.os.IBinder; 45import android.os.Parcel; 46import android.os.Parcelable; 47import android.os.RemoteException; 48import android.os.SystemClock; 49import android.os.SystemProperties; 50import android.util.AttributeSet; 51import android.util.FloatProperty; 52import android.util.LocaleUtil; 53import android.util.Log; 54import android.util.Pool; 55import android.util.Poolable; 56import android.util.PoolableManager; 57import android.util.Pools; 58import android.util.Property; 59import android.util.SparseArray; 60import android.util.TypedValue; 61import android.view.ContextMenu.ContextMenuInfo; 62import android.view.AccessibilityIterators.TextSegmentIterator; 63import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 64import android.view.AccessibilityIterators.WordTextSegmentIterator; 65import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 66import android.view.accessibility.AccessibilityEvent; 67import android.view.accessibility.AccessibilityEventSource; 68import android.view.accessibility.AccessibilityManager; 69import android.view.accessibility.AccessibilityNodeInfo; 70import android.view.accessibility.AccessibilityNodeProvider; 71import android.view.animation.Animation; 72import android.view.animation.AnimationUtils; 73import android.view.animation.Transformation; 74import android.view.inputmethod.EditorInfo; 75import android.view.inputmethod.InputConnection; 76import android.view.inputmethod.InputMethodManager; 77import android.widget.ScrollBarDrawable; 78 79import static android.os.Build.VERSION_CODES.*; 80import static java.lang.Math.max; 81 82import com.android.internal.R; 83import com.android.internal.util.Predicate; 84import com.android.internal.view.menu.MenuBuilder; 85 86import java.lang.ref.WeakReference; 87import java.lang.reflect.InvocationTargetException; 88import java.lang.reflect.Method; 89import java.util.ArrayList; 90import java.util.Arrays; 91import java.util.Locale; 92import java.util.concurrent.CopyOnWriteArrayList; 93 94/** 95 * <p> 96 * This class represents the basic building block for user interface components. A View 97 * occupies a rectangular area on the screen and is responsible for drawing and 98 * event handling. View is the base class for <em>widgets</em>, which are 99 * used to create interactive UI components (buttons, text fields, etc.). The 100 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 101 * are invisible containers that hold other Views (or other ViewGroups) and define 102 * their layout properties. 103 * </p> 104 * 105 * <div class="special reference"> 106 * <h3>Developer Guides</h3> 107 * <p>For information about using this class to develop your application's user interface, 108 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 109 * </div> 110 * 111 * <a name="Using"></a> 112 * <h3>Using Views</h3> 113 * <p> 114 * All of the views in a window are arranged in a single tree. You can add views 115 * either from code or by specifying a tree of views in one or more XML layout 116 * files. There are many specialized subclasses of views that act as controls or 117 * are capable of displaying text, images, or other content. 118 * </p> 119 * <p> 120 * Once you have created a tree of views, there are typically a few types of 121 * common operations you may wish to perform: 122 * <ul> 123 * <li><strong>Set properties:</strong> for example setting the text of a 124 * {@link android.widget.TextView}. The available properties and the methods 125 * that set them will vary among the different subclasses of views. Note that 126 * properties that are known at build time can be set in the XML layout 127 * files.</li> 128 * <li><strong>Set focus:</strong> The framework will handled moving focus in 129 * response to user input. To force focus to a specific view, call 130 * {@link #requestFocus}.</li> 131 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 132 * that will be notified when something interesting happens to the view. For 133 * example, all views will let you set a listener to be notified when the view 134 * gains or loses focus. You can register such a listener using 135 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 136 * Other view subclasses offer more specialized listeners. For example, a Button 137 * exposes a listener to notify clients when the button is clicked.</li> 138 * <li><strong>Set visibility:</strong> You can hide or show views using 139 * {@link #setVisibility(int)}.</li> 140 * </ul> 141 * </p> 142 * <p><em> 143 * Note: The Android framework is responsible for measuring, laying out and 144 * drawing views. You should not call methods that perform these actions on 145 * views yourself unless you are actually implementing a 146 * {@link android.view.ViewGroup}. 147 * </em></p> 148 * 149 * <a name="Lifecycle"></a> 150 * <h3>Implementing a Custom View</h3> 151 * 152 * <p> 153 * To implement a custom view, you will usually begin by providing overrides for 154 * some of the standard methods that the framework calls on all views. You do 155 * not need to override all of these methods. In fact, you can start by just 156 * overriding {@link #onDraw(android.graphics.Canvas)}. 157 * <table border="2" width="85%" align="center" cellpadding="5"> 158 * <thead> 159 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 160 * </thead> 161 * 162 * <tbody> 163 * <tr> 164 * <td rowspan="2">Creation</td> 165 * <td>Constructors</td> 166 * <td>There is a form of the constructor that are called when the view 167 * is created from code and a form that is called when the view is 168 * inflated from a layout file. The second form should parse and apply 169 * any attributes defined in the layout file. 170 * </td> 171 * </tr> 172 * <tr> 173 * <td><code>{@link #onFinishInflate()}</code></td> 174 * <td>Called after a view and all of its children has been inflated 175 * from XML.</td> 176 * </tr> 177 * 178 * <tr> 179 * <td rowspan="3">Layout</td> 180 * <td><code>{@link #onMeasure(int, int)}</code></td> 181 * <td>Called to determine the size requirements for this view and all 182 * of its children. 183 * </td> 184 * </tr> 185 * <tr> 186 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 187 * <td>Called when this view should assign a size and position to all 188 * of its children. 189 * </td> 190 * </tr> 191 * <tr> 192 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 193 * <td>Called when the size of this view has changed. 194 * </td> 195 * </tr> 196 * 197 * <tr> 198 * <td>Drawing</td> 199 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 200 * <td>Called when the view should render its content. 201 * </td> 202 * </tr> 203 * 204 * <tr> 205 * <td rowspan="4">Event processing</td> 206 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 207 * <td>Called when a new key event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 212 * <td>Called when a key up event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 217 * <td>Called when a trackball motion event occurs. 218 * </td> 219 * </tr> 220 * <tr> 221 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 222 * <td>Called when a touch screen motion event occurs. 223 * </td> 224 * </tr> 225 * 226 * <tr> 227 * <td rowspan="2">Focus</td> 228 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 229 * <td>Called when the view gains or loses focus. 230 * </td> 231 * </tr> 232 * 233 * <tr> 234 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 235 * <td>Called when the window containing the view gains or loses focus. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td rowspan="3">Attaching</td> 241 * <td><code>{@link #onAttachedToWindow()}</code></td> 242 * <td>Called when the view is attached to a window. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td><code>{@link #onDetachedFromWindow}</code></td> 248 * <td>Called when the view is detached from its window. 249 * </td> 250 * </tr> 251 * 252 * <tr> 253 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 254 * <td>Called when the visibility of the window containing the view 255 * has changed. 256 * </td> 257 * </tr> 258 * </tbody> 259 * 260 * </table> 261 * </p> 262 * 263 * <a name="IDs"></a> 264 * <h3>IDs</h3> 265 * Views may have an integer id associated with them. These ids are typically 266 * assigned in the layout XML files, and are used to find specific views within 267 * the view tree. A common pattern is to: 268 * <ul> 269 * <li>Define a Button in the layout file and assign it a unique ID. 270 * <pre> 271 * <Button 272 * android:id="@+id/my_button" 273 * android:layout_width="wrap_content" 274 * android:layout_height="wrap_content" 275 * android:text="@string/my_button_text"/> 276 * </pre></li> 277 * <li>From the onCreate method of an Activity, find the Button 278 * <pre class="prettyprint"> 279 * Button myButton = (Button) findViewById(R.id.my_button); 280 * </pre></li> 281 * </ul> 282 * <p> 283 * View IDs need not be unique throughout the tree, but it is good practice to 284 * ensure that they are at least unique within the part of the tree you are 285 * searching. 286 * </p> 287 * 288 * <a name="Position"></a> 289 * <h3>Position</h3> 290 * <p> 291 * The geometry of a view is that of a rectangle. A view has a location, 292 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 293 * two dimensions, expressed as a width and a height. The unit for location 294 * and dimensions is the pixel. 295 * </p> 296 * 297 * <p> 298 * It is possible to retrieve the location of a view by invoking the methods 299 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 300 * coordinate of the rectangle representing the view. The latter returns the 301 * top, or Y, coordinate of the rectangle representing the view. These methods 302 * both return the location of the view relative to its parent. For instance, 303 * when getLeft() returns 20, that means the view is located 20 pixels to the 304 * right of the left edge of its direct parent. 305 * </p> 306 * 307 * <p> 308 * In addition, several convenience methods are offered to avoid unnecessary 309 * computations, namely {@link #getRight()} and {@link #getBottom()}. 310 * These methods return the coordinates of the right and bottom edges of the 311 * rectangle representing the view. For instance, calling {@link #getRight()} 312 * is similar to the following computation: <code>getLeft() + getWidth()</code> 313 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 314 * </p> 315 * 316 * <a name="SizePaddingMargins"></a> 317 * <h3>Size, padding and margins</h3> 318 * <p> 319 * The size of a view is expressed with a width and a height. A view actually 320 * possess two pairs of width and height values. 321 * </p> 322 * 323 * <p> 324 * The first pair is known as <em>measured width</em> and 325 * <em>measured height</em>. These dimensions define how big a view wants to be 326 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 327 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 328 * and {@link #getMeasuredHeight()}. 329 * </p> 330 * 331 * <p> 332 * The second pair is simply known as <em>width</em> and <em>height</em>, or 333 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 334 * dimensions define the actual size of the view on screen, at drawing time and 335 * after layout. These values may, but do not have to, be different from the 336 * measured width and height. The width and height can be obtained by calling 337 * {@link #getWidth()} and {@link #getHeight()}. 338 * </p> 339 * 340 * <p> 341 * To measure its dimensions, a view takes into account its padding. The padding 342 * is expressed in pixels for the left, top, right and bottom parts of the view. 343 * Padding can be used to offset the content of the view by a specific amount of 344 * pixels. For instance, a left padding of 2 will push the view's content by 345 * 2 pixels to the right of the left edge. Padding can be set using the 346 * {@link #setPadding(int, int, int, int)} method and queried by calling 347 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, {@link #getPaddingRight()}, 348 * {@link #getPaddingBottom()}. 349 * </p> 350 * 351 * <p> 352 * Even though a view can define a padding, it does not provide any support for 353 * margins. However, view groups provide such a support. Refer to 354 * {@link android.view.ViewGroup} and 355 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 356 * </p> 357 * 358 * <a name="Layout"></a> 359 * <h3>Layout</h3> 360 * <p> 361 * Layout is a two pass process: a measure pass and a layout pass. The measuring 362 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 363 * of the view tree. Each view pushes dimension specifications down the tree 364 * during the recursion. At the end of the measure pass, every view has stored 365 * its measurements. The second pass happens in 366 * {@link #layout(int,int,int,int)} and is also top-down. During 367 * this pass each parent is responsible for positioning all of its children 368 * using the sizes computed in the measure pass. 369 * </p> 370 * 371 * <p> 372 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 373 * {@link #getMeasuredHeight()} values must be set, along with those for all of 374 * that view's descendants. A view's measured width and measured height values 375 * must respect the constraints imposed by the view's parents. This guarantees 376 * that at the end of the measure pass, all parents accept all of their 377 * children's measurements. A parent view may call measure() more than once on 378 * its children. For example, the parent may measure each child once with 379 * unspecified dimensions to find out how big they want to be, then call 380 * measure() on them again with actual numbers if the sum of all the children's 381 * unconstrained sizes is too big or too small. 382 * </p> 383 * 384 * <p> 385 * The measure pass uses two classes to communicate dimensions. The 386 * {@link MeasureSpec} class is used by views to tell their parents how they 387 * want to be measured and positioned. The base LayoutParams class just 388 * describes how big the view wants to be for both width and height. For each 389 * dimension, it can specify one of: 390 * <ul> 391 * <li> an exact number 392 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 393 * (minus padding) 394 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 395 * enclose its content (plus padding). 396 * </ul> 397 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 398 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 399 * an X and Y value. 400 * </p> 401 * 402 * <p> 403 * MeasureSpecs are used to push requirements down the tree from parent to 404 * child. A MeasureSpec can be in one of three modes: 405 * <ul> 406 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 407 * of a child view. For example, a LinearLayout may call measure() on its child 408 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 409 * tall the child view wants to be given a width of 240 pixels. 410 * <li>EXACTLY: This is used by the parent to impose an exact size on the 411 * child. The child must use this size, and guarantee that all of its 412 * descendants will fit within this size. 413 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 414 * child. The child must gurantee that it and all of its descendants will fit 415 * within this size. 416 * </ul> 417 * </p> 418 * 419 * <p> 420 * To intiate a layout, call {@link #requestLayout}. This method is typically 421 * called by a view on itself when it believes that is can no longer fit within 422 * its current bounds. 423 * </p> 424 * 425 * <a name="Drawing"></a> 426 * <h3>Drawing</h3> 427 * <p> 428 * Drawing is handled by walking the tree and rendering each view that 429 * intersects the invalid region. Because the tree is traversed in-order, 430 * this means that parents will draw before (i.e., behind) their children, with 431 * siblings drawn in the order they appear in the tree. 432 * If you set a background drawable for a View, then the View will draw it for you 433 * before calling back to its <code>onDraw()</code> method. 434 * </p> 435 * 436 * <p> 437 * Note that the framework will not draw views that are not in the invalid region. 438 * </p> 439 * 440 * <p> 441 * To force a view to draw, call {@link #invalidate()}. 442 * </p> 443 * 444 * <a name="EventHandlingThreading"></a> 445 * <h3>Event Handling and Threading</h3> 446 * <p> 447 * The basic cycle of a view is as follows: 448 * <ol> 449 * <li>An event comes in and is dispatched to the appropriate view. The view 450 * handles the event and notifies any listeners.</li> 451 * <li>If in the course of processing the event, the view's bounds may need 452 * to be changed, the view will call {@link #requestLayout()}.</li> 453 * <li>Similarly, if in the course of processing the event the view's appearance 454 * may need to be changed, the view will call {@link #invalidate()}.</li> 455 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 456 * the framework will take care of measuring, laying out, and drawing the tree 457 * as appropriate.</li> 458 * </ol> 459 * </p> 460 * 461 * <p><em>Note: The entire view tree is single threaded. You must always be on 462 * the UI thread when calling any method on any view.</em> 463 * If you are doing work on other threads and want to update the state of a view 464 * from that thread, you should use a {@link Handler}. 465 * </p> 466 * 467 * <a name="FocusHandling"></a> 468 * <h3>Focus Handling</h3> 469 * <p> 470 * The framework will handle routine focus movement in response to user input. 471 * This includes changing the focus as views are removed or hidden, or as new 472 * views become available. Views indicate their willingness to take focus 473 * through the {@link #isFocusable} method. To change whether a view can take 474 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 475 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 476 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 477 * </p> 478 * <p> 479 * Focus movement is based on an algorithm which finds the nearest neighbor in a 480 * given direction. In rare cases, the default algorithm may not match the 481 * intended behavior of the developer. In these situations, you can provide 482 * explicit overrides by using these XML attributes in the layout file: 483 * <pre> 484 * nextFocusDown 485 * nextFocusLeft 486 * nextFocusRight 487 * nextFocusUp 488 * </pre> 489 * </p> 490 * 491 * 492 * <p> 493 * To get a particular view to take focus, call {@link #requestFocus()}. 494 * </p> 495 * 496 * <a name="TouchMode"></a> 497 * <h3>Touch Mode</h3> 498 * <p> 499 * When a user is navigating a user interface via directional keys such as a D-pad, it is 500 * necessary to give focus to actionable items such as buttons so the user can see 501 * what will take input. If the device has touch capabilities, however, and the user 502 * begins interacting with the interface by touching it, it is no longer necessary to 503 * always highlight, or give focus to, a particular view. This motivates a mode 504 * for interaction named 'touch mode'. 505 * </p> 506 * <p> 507 * For a touch capable device, once the user touches the screen, the device 508 * will enter touch mode. From this point onward, only views for which 509 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 510 * Other views that are touchable, like buttons, will not take focus when touched; they will 511 * only fire the on click listeners. 512 * </p> 513 * <p> 514 * Any time a user hits a directional key, such as a D-pad direction, the view device will 515 * exit touch mode, and find a view to take focus, so that the user may resume interacting 516 * with the user interface without touching the screen again. 517 * </p> 518 * <p> 519 * The touch mode state is maintained across {@link android.app.Activity}s. Call 520 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 521 * </p> 522 * 523 * <a name="Scrolling"></a> 524 * <h3>Scrolling</h3> 525 * <p> 526 * The framework provides basic support for views that wish to internally 527 * scroll their content. This includes keeping track of the X and Y scroll 528 * offset as well as mechanisms for drawing scrollbars. See 529 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 530 * {@link #awakenScrollBars()} for more details. 531 * </p> 532 * 533 * <a name="Tags"></a> 534 * <h3>Tags</h3> 535 * <p> 536 * Unlike IDs, tags are not used to identify views. Tags are essentially an 537 * extra piece of information that can be associated with a view. They are most 538 * often used as a convenience to store data related to views in the views 539 * themselves rather than by putting them in a separate structure. 540 * </p> 541 * 542 * <a name="Properties"></a> 543 * <h3>Properties</h3> 544 * <p> 545 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 546 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 547 * available both in the {@link Property} form as well as in similarly-named setter/getter 548 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 549 * be used to set persistent state associated with these rendering-related properties on the view. 550 * The properties and methods can also be used in conjunction with 551 * {@link android.animation.Animator Animator}-based animations, described more in the 552 * <a href="#Animation">Animation</a> section. 553 * </p> 554 * 555 * <a name="Animation"></a> 556 * <h3>Animation</h3> 557 * <p> 558 * Starting with Android 3.0, the preferred way of animating views is to use the 559 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 560 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 561 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 562 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 563 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 564 * makes animating these View properties particularly easy and efficient. 565 * </p> 566 * <p> 567 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 568 * You can attach an {@link Animation} object to a view using 569 * {@link #setAnimation(Animation)} or 570 * {@link #startAnimation(Animation)}. The animation can alter the scale, 571 * rotation, translation and alpha of a view over time. If the animation is 572 * attached to a view that has children, the animation will affect the entire 573 * subtree rooted by that node. When an animation is started, the framework will 574 * take care of redrawing the appropriate views until the animation completes. 575 * </p> 576 * 577 * <a name="Security"></a> 578 * <h3>Security</h3> 579 * <p> 580 * Sometimes it is essential that an application be able to verify that an action 581 * is being performed with the full knowledge and consent of the user, such as 582 * granting a permission request, making a purchase or clicking on an advertisement. 583 * Unfortunately, a malicious application could try to spoof the user into 584 * performing these actions, unaware, by concealing the intended purpose of the view. 585 * As a remedy, the framework offers a touch filtering mechanism that can be used to 586 * improve the security of views that provide access to sensitive functionality. 587 * </p><p> 588 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 589 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 590 * will discard touches that are received whenever the view's window is obscured by 591 * another visible window. As a result, the view will not receive touches whenever a 592 * toast, dialog or other window appears above the view's window. 593 * </p><p> 594 * For more fine-grained control over security, consider overriding the 595 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 596 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 597 * </p> 598 * 599 * @attr ref android.R.styleable#View_alpha 600 * @attr ref android.R.styleable#View_background 601 * @attr ref android.R.styleable#View_clickable 602 * @attr ref android.R.styleable#View_contentDescription 603 * @attr ref android.R.styleable#View_drawingCacheQuality 604 * @attr ref android.R.styleable#View_duplicateParentState 605 * @attr ref android.R.styleable#View_id 606 * @attr ref android.R.styleable#View_requiresFadingEdge 607 * @attr ref android.R.styleable#View_fadeScrollbars 608 * @attr ref android.R.styleable#View_fadingEdgeLength 609 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 610 * @attr ref android.R.styleable#View_fitsSystemWindows 611 * @attr ref android.R.styleable#View_isScrollContainer 612 * @attr ref android.R.styleable#View_focusable 613 * @attr ref android.R.styleable#View_focusableInTouchMode 614 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 615 * @attr ref android.R.styleable#View_keepScreenOn 616 * @attr ref android.R.styleable#View_layerType 617 * @attr ref android.R.styleable#View_longClickable 618 * @attr ref android.R.styleable#View_minHeight 619 * @attr ref android.R.styleable#View_minWidth 620 * @attr ref android.R.styleable#View_nextFocusDown 621 * @attr ref android.R.styleable#View_nextFocusLeft 622 * @attr ref android.R.styleable#View_nextFocusRight 623 * @attr ref android.R.styleable#View_nextFocusUp 624 * @attr ref android.R.styleable#View_onClick 625 * @attr ref android.R.styleable#View_padding 626 * @attr ref android.R.styleable#View_paddingBottom 627 * @attr ref android.R.styleable#View_paddingLeft 628 * @attr ref android.R.styleable#View_paddingRight 629 * @attr ref android.R.styleable#View_paddingTop 630 * @attr ref android.R.styleable#View_saveEnabled 631 * @attr ref android.R.styleable#View_rotation 632 * @attr ref android.R.styleable#View_rotationX 633 * @attr ref android.R.styleable#View_rotationY 634 * @attr ref android.R.styleable#View_scaleX 635 * @attr ref android.R.styleable#View_scaleY 636 * @attr ref android.R.styleable#View_scrollX 637 * @attr ref android.R.styleable#View_scrollY 638 * @attr ref android.R.styleable#View_scrollbarSize 639 * @attr ref android.R.styleable#View_scrollbarStyle 640 * @attr ref android.R.styleable#View_scrollbars 641 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 642 * @attr ref android.R.styleable#View_scrollbarFadeDuration 643 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 644 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 645 * @attr ref android.R.styleable#View_scrollbarThumbVertical 646 * @attr ref android.R.styleable#View_scrollbarTrackVertical 647 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 648 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 649 * @attr ref android.R.styleable#View_soundEffectsEnabled 650 * @attr ref android.R.styleable#View_tag 651 * @attr ref android.R.styleable#View_transformPivotX 652 * @attr ref android.R.styleable#View_transformPivotY 653 * @attr ref android.R.styleable#View_translationX 654 * @attr ref android.R.styleable#View_translationY 655 * @attr ref android.R.styleable#View_visibility 656 * 657 * @see android.view.ViewGroup 658 */ 659public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 660 AccessibilityEventSource { 661 private static final boolean DBG = false; 662 663 /** 664 * The logging tag used by this class with android.util.Log. 665 */ 666 protected static final String VIEW_LOG_TAG = "View"; 667 668 /** 669 * When set to true, apps will draw debugging information about their layouts. 670 * 671 * @hide 672 */ 673 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 674 675 /** 676 * Used to mark a View that has no ID. 677 */ 678 public static final int NO_ID = -1; 679 680 /** 681 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 682 * calling setFlags. 683 */ 684 private static final int NOT_FOCUSABLE = 0x00000000; 685 686 /** 687 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 688 * setFlags. 689 */ 690 private static final int FOCUSABLE = 0x00000001; 691 692 /** 693 * Mask for use with setFlags indicating bits used for focus. 694 */ 695 private static final int FOCUSABLE_MASK = 0x00000001; 696 697 /** 698 * This view will adjust its padding to fit sytem windows (e.g. status bar) 699 */ 700 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 701 702 /** 703 * This view is visible. 704 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 705 * android:visibility}. 706 */ 707 public static final int VISIBLE = 0x00000000; 708 709 /** 710 * This view is invisible, but it still takes up space for layout purposes. 711 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 712 * android:visibility}. 713 */ 714 public static final int INVISIBLE = 0x00000004; 715 716 /** 717 * This view is invisible, and it doesn't take any space for layout 718 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 719 * android:visibility}. 720 */ 721 public static final int GONE = 0x00000008; 722 723 /** 724 * Mask for use with setFlags indicating bits used for visibility. 725 * {@hide} 726 */ 727 static final int VISIBILITY_MASK = 0x0000000C; 728 729 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 730 731 /** 732 * This view is enabled. Interpretation varies by subclass. 733 * Use with ENABLED_MASK when calling setFlags. 734 * {@hide} 735 */ 736 static final int ENABLED = 0x00000000; 737 738 /** 739 * This view is disabled. Interpretation varies by subclass. 740 * Use with ENABLED_MASK when calling setFlags. 741 * {@hide} 742 */ 743 static final int DISABLED = 0x00000020; 744 745 /** 746 * Mask for use with setFlags indicating bits used for indicating whether 747 * this view is enabled 748 * {@hide} 749 */ 750 static final int ENABLED_MASK = 0x00000020; 751 752 /** 753 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 754 * called and further optimizations will be performed. It is okay to have 755 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 756 * {@hide} 757 */ 758 static final int WILL_NOT_DRAW = 0x00000080; 759 760 /** 761 * Mask for use with setFlags indicating bits used for indicating whether 762 * this view is will draw 763 * {@hide} 764 */ 765 static final int DRAW_MASK = 0x00000080; 766 767 /** 768 * <p>This view doesn't show scrollbars.</p> 769 * {@hide} 770 */ 771 static final int SCROLLBARS_NONE = 0x00000000; 772 773 /** 774 * <p>This view shows horizontal scrollbars.</p> 775 * {@hide} 776 */ 777 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 778 779 /** 780 * <p>This view shows vertical scrollbars.</p> 781 * {@hide} 782 */ 783 static final int SCROLLBARS_VERTICAL = 0x00000200; 784 785 /** 786 * <p>Mask for use with setFlags indicating bits used for indicating which 787 * scrollbars are enabled.</p> 788 * {@hide} 789 */ 790 static final int SCROLLBARS_MASK = 0x00000300; 791 792 /** 793 * Indicates that the view should filter touches when its window is obscured. 794 * Refer to the class comments for more information about this security feature. 795 * {@hide} 796 */ 797 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 798 799 /** 800 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 801 * that they are optional and should be skipped if the window has 802 * requested system UI flags that ignore those insets for layout. 803 */ 804 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 805 806 /** 807 * <p>This view doesn't show fading edges.</p> 808 * {@hide} 809 */ 810 static final int FADING_EDGE_NONE = 0x00000000; 811 812 /** 813 * <p>This view shows horizontal fading edges.</p> 814 * {@hide} 815 */ 816 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 817 818 /** 819 * <p>This view shows vertical fading edges.</p> 820 * {@hide} 821 */ 822 static final int FADING_EDGE_VERTICAL = 0x00002000; 823 824 /** 825 * <p>Mask for use with setFlags indicating bits used for indicating which 826 * fading edges are enabled.</p> 827 * {@hide} 828 */ 829 static final int FADING_EDGE_MASK = 0x00003000; 830 831 /** 832 * <p>Indicates this view can be clicked. When clickable, a View reacts 833 * to clicks by notifying the OnClickListener.<p> 834 * {@hide} 835 */ 836 static final int CLICKABLE = 0x00004000; 837 838 /** 839 * <p>Indicates this view is caching its drawing into a bitmap.</p> 840 * {@hide} 841 */ 842 static final int DRAWING_CACHE_ENABLED = 0x00008000; 843 844 /** 845 * <p>Indicates that no icicle should be saved for this view.<p> 846 * {@hide} 847 */ 848 static final int SAVE_DISABLED = 0x000010000; 849 850 /** 851 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 852 * property.</p> 853 * {@hide} 854 */ 855 static final int SAVE_DISABLED_MASK = 0x000010000; 856 857 /** 858 * <p>Indicates that no drawing cache should ever be created for this view.<p> 859 * {@hide} 860 */ 861 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 862 863 /** 864 * <p>Indicates this view can take / keep focus when int touch mode.</p> 865 * {@hide} 866 */ 867 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 868 869 /** 870 * <p>Enables low quality mode for the drawing cache.</p> 871 */ 872 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 873 874 /** 875 * <p>Enables high quality mode for the drawing cache.</p> 876 */ 877 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 878 879 /** 880 * <p>Enables automatic quality mode for the drawing cache.</p> 881 */ 882 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 883 884 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 885 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 886 }; 887 888 /** 889 * <p>Mask for use with setFlags indicating bits used for the cache 890 * quality property.</p> 891 * {@hide} 892 */ 893 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 894 895 /** 896 * <p> 897 * Indicates this view can be long clicked. When long clickable, a View 898 * reacts to long clicks by notifying the OnLongClickListener or showing a 899 * context menu. 900 * </p> 901 * {@hide} 902 */ 903 static final int LONG_CLICKABLE = 0x00200000; 904 905 /** 906 * <p>Indicates that this view gets its drawable states from its direct parent 907 * and ignores its original internal states.</p> 908 * 909 * @hide 910 */ 911 static final int DUPLICATE_PARENT_STATE = 0x00400000; 912 913 /** 914 * The scrollbar style to display the scrollbars inside the content area, 915 * without increasing the padding. The scrollbars will be overlaid with 916 * translucency on the view's content. 917 */ 918 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 919 920 /** 921 * The scrollbar style to display the scrollbars inside the padded area, 922 * increasing the padding of the view. The scrollbars will not overlap the 923 * content area of the view. 924 */ 925 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 926 927 /** 928 * The scrollbar style to display the scrollbars at the edge of the view, 929 * without increasing the padding. The scrollbars will be overlaid with 930 * translucency. 931 */ 932 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 933 934 /** 935 * The scrollbar style to display the scrollbars at the edge of the view, 936 * increasing the padding of the view. The scrollbars will only overlap the 937 * background, if any. 938 */ 939 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 940 941 /** 942 * Mask to check if the scrollbar style is overlay or inset. 943 * {@hide} 944 */ 945 static final int SCROLLBARS_INSET_MASK = 0x01000000; 946 947 /** 948 * Mask to check if the scrollbar style is inside or outside. 949 * {@hide} 950 */ 951 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 952 953 /** 954 * Mask for scrollbar style. 955 * {@hide} 956 */ 957 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 958 959 /** 960 * View flag indicating that the screen should remain on while the 961 * window containing this view is visible to the user. This effectively 962 * takes care of automatically setting the WindowManager's 963 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 964 */ 965 public static final int KEEP_SCREEN_ON = 0x04000000; 966 967 /** 968 * View flag indicating whether this view should have sound effects enabled 969 * for events such as clicking and touching. 970 */ 971 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 972 973 /** 974 * View flag indicating whether this view should have haptic feedback 975 * enabled for events such as long presses. 976 */ 977 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 978 979 /** 980 * <p>Indicates that the view hierarchy should stop saving state when 981 * it reaches this view. If state saving is initiated immediately at 982 * the view, it will be allowed. 983 * {@hide} 984 */ 985 static final int PARENT_SAVE_DISABLED = 0x20000000; 986 987 /** 988 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 989 * {@hide} 990 */ 991 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 992 993 /** 994 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 995 * should add all focusable Views regardless if they are focusable in touch mode. 996 */ 997 public static final int FOCUSABLES_ALL = 0x00000000; 998 999 /** 1000 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1001 * should add only Views focusable in touch mode. 1002 */ 1003 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1004 1005 /** 1006 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1007 * should add only accessibility focusable Views. 1008 * 1009 * @hide 1010 */ 1011 public static final int FOCUSABLES_ACCESSIBILITY = 0x00000002; 1012 1013 /** 1014 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1015 * item. 1016 */ 1017 public static final int FOCUS_BACKWARD = 0x00000001; 1018 1019 /** 1020 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1021 * item. 1022 */ 1023 public static final int FOCUS_FORWARD = 0x00000002; 1024 1025 /** 1026 * Use with {@link #focusSearch(int)}. Move focus to the left. 1027 */ 1028 public static final int FOCUS_LEFT = 0x00000011; 1029 1030 /** 1031 * Use with {@link #focusSearch(int)}. Move focus up. 1032 */ 1033 public static final int FOCUS_UP = 0x00000021; 1034 1035 /** 1036 * Use with {@link #focusSearch(int)}. Move focus to the right. 1037 */ 1038 public static final int FOCUS_RIGHT = 0x00000042; 1039 1040 /** 1041 * Use with {@link #focusSearch(int)}. Move focus down. 1042 */ 1043 public static final int FOCUS_DOWN = 0x00000082; 1044 1045 // Accessibility focus directions. 1046 1047 /** 1048 * The accessibility focus which is the current user position when 1049 * interacting with the accessibility framework. 1050 */ 1051 public static final int FOCUS_ACCESSIBILITY = 0x00001000; 1052 1053 /** 1054 * Use with {@link #focusSearch(int)}. Move acessibility focus left. 1055 */ 1056 public static final int ACCESSIBILITY_FOCUS_LEFT = FOCUS_LEFT | FOCUS_ACCESSIBILITY; 1057 1058 /** 1059 * Use with {@link #focusSearch(int)}. Move acessibility focus up. 1060 */ 1061 public static final int ACCESSIBILITY_FOCUS_UP = FOCUS_UP | FOCUS_ACCESSIBILITY; 1062 1063 /** 1064 * Use with {@link #focusSearch(int)}. Move acessibility focus right. 1065 */ 1066 public static final int ACCESSIBILITY_FOCUS_RIGHT = FOCUS_RIGHT | FOCUS_ACCESSIBILITY; 1067 1068 /** 1069 * Use with {@link #focusSearch(int)}. Move acessibility focus down. 1070 */ 1071 public static final int ACCESSIBILITY_FOCUS_DOWN = FOCUS_DOWN | FOCUS_ACCESSIBILITY; 1072 1073 /** 1074 * Use with {@link #focusSearch(int)}. Move acessibility focus forward. 1075 */ 1076 public static final int ACCESSIBILITY_FOCUS_FORWARD = FOCUS_FORWARD | FOCUS_ACCESSIBILITY; 1077 1078 /** 1079 * Use with {@link #focusSearch(int)}. Move acessibility focus backward. 1080 */ 1081 public static final int ACCESSIBILITY_FOCUS_BACKWARD = FOCUS_BACKWARD | FOCUS_ACCESSIBILITY; 1082 1083 /** 1084 * Bits of {@link #getMeasuredWidthAndState()} and 1085 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1086 */ 1087 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1088 1089 /** 1090 * Bits of {@link #getMeasuredWidthAndState()} and 1091 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1092 */ 1093 public static final int MEASURED_STATE_MASK = 0xff000000; 1094 1095 /** 1096 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1097 * for functions that combine both width and height into a single int, 1098 * such as {@link #getMeasuredState()} and the childState argument of 1099 * {@link #resolveSizeAndState(int, int, int)}. 1100 */ 1101 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1102 1103 /** 1104 * Bit of {@link #getMeasuredWidthAndState()} and 1105 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1106 * is smaller that the space the view would like to have. 1107 */ 1108 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1109 1110 /** 1111 * Base View state sets 1112 */ 1113 // Singles 1114 /** 1115 * Indicates the view has no states set. 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 */ 1122 protected static final int[] EMPTY_STATE_SET; 1123 /** 1124 * Indicates the view is enabled. States are used with 1125 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1126 * view depending on its state. 1127 * 1128 * @see android.graphics.drawable.Drawable 1129 * @see #getDrawableState() 1130 */ 1131 protected static final int[] ENABLED_STATE_SET; 1132 /** 1133 * Indicates the view is focused. States are used with 1134 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1135 * view depending on its state. 1136 * 1137 * @see android.graphics.drawable.Drawable 1138 * @see #getDrawableState() 1139 */ 1140 protected static final int[] FOCUSED_STATE_SET; 1141 /** 1142 * Indicates the view is selected. States are used with 1143 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1144 * view depending on its state. 1145 * 1146 * @see android.graphics.drawable.Drawable 1147 * @see #getDrawableState() 1148 */ 1149 protected static final int[] SELECTED_STATE_SET; 1150 /** 1151 * Indicates the view is pressed. States are used with 1152 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1153 * view depending on its state. 1154 * 1155 * @see android.graphics.drawable.Drawable 1156 * @see #getDrawableState() 1157 * @hide 1158 */ 1159 protected static final int[] PRESSED_STATE_SET; 1160 /** 1161 * Indicates the view's window has focus. States are used with 1162 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1163 * view depending on its state. 1164 * 1165 * @see android.graphics.drawable.Drawable 1166 * @see #getDrawableState() 1167 */ 1168 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1169 // Doubles 1170 /** 1171 * Indicates the view is enabled and has the focus. 1172 * 1173 * @see #ENABLED_STATE_SET 1174 * @see #FOCUSED_STATE_SET 1175 */ 1176 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1177 /** 1178 * Indicates the view is enabled and selected. 1179 * 1180 * @see #ENABLED_STATE_SET 1181 * @see #SELECTED_STATE_SET 1182 */ 1183 protected static final int[] ENABLED_SELECTED_STATE_SET; 1184 /** 1185 * Indicates the view is enabled and that its window has focus. 1186 * 1187 * @see #ENABLED_STATE_SET 1188 * @see #WINDOW_FOCUSED_STATE_SET 1189 */ 1190 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1191 /** 1192 * Indicates the view is focused and selected. 1193 * 1194 * @see #FOCUSED_STATE_SET 1195 * @see #SELECTED_STATE_SET 1196 */ 1197 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1198 /** 1199 * Indicates the view has the focus and that its window has the focus. 1200 * 1201 * @see #FOCUSED_STATE_SET 1202 * @see #WINDOW_FOCUSED_STATE_SET 1203 */ 1204 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1205 /** 1206 * Indicates the view is selected and that its window has the focus. 1207 * 1208 * @see #SELECTED_STATE_SET 1209 * @see #WINDOW_FOCUSED_STATE_SET 1210 */ 1211 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1212 // Triples 1213 /** 1214 * Indicates the view is enabled, focused and selected. 1215 * 1216 * @see #ENABLED_STATE_SET 1217 * @see #FOCUSED_STATE_SET 1218 * @see #SELECTED_STATE_SET 1219 */ 1220 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1221 /** 1222 * Indicates the view is enabled, focused and its window has the focus. 1223 * 1224 * @see #ENABLED_STATE_SET 1225 * @see #FOCUSED_STATE_SET 1226 * @see #WINDOW_FOCUSED_STATE_SET 1227 */ 1228 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1229 /** 1230 * Indicates the view is enabled, selected and its window has the focus. 1231 * 1232 * @see #ENABLED_STATE_SET 1233 * @see #SELECTED_STATE_SET 1234 * @see #WINDOW_FOCUSED_STATE_SET 1235 */ 1236 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1237 /** 1238 * Indicates the view is focused, selected and its window has the focus. 1239 * 1240 * @see #FOCUSED_STATE_SET 1241 * @see #SELECTED_STATE_SET 1242 * @see #WINDOW_FOCUSED_STATE_SET 1243 */ 1244 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1245 /** 1246 * Indicates the view is enabled, focused, selected and its window 1247 * has the focus. 1248 * 1249 * @see #ENABLED_STATE_SET 1250 * @see #FOCUSED_STATE_SET 1251 * @see #SELECTED_STATE_SET 1252 * @see #WINDOW_FOCUSED_STATE_SET 1253 */ 1254 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1255 /** 1256 * Indicates the view is pressed and its window has the focus. 1257 * 1258 * @see #PRESSED_STATE_SET 1259 * @see #WINDOW_FOCUSED_STATE_SET 1260 */ 1261 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1262 /** 1263 * Indicates the view is pressed and selected. 1264 * 1265 * @see #PRESSED_STATE_SET 1266 * @see #SELECTED_STATE_SET 1267 */ 1268 protected static final int[] PRESSED_SELECTED_STATE_SET; 1269 /** 1270 * Indicates the view is pressed, selected and its window has the focus. 1271 * 1272 * @see #PRESSED_STATE_SET 1273 * @see #SELECTED_STATE_SET 1274 * @see #WINDOW_FOCUSED_STATE_SET 1275 */ 1276 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1277 /** 1278 * Indicates the view is pressed and focused. 1279 * 1280 * @see #PRESSED_STATE_SET 1281 * @see #FOCUSED_STATE_SET 1282 */ 1283 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1284 /** 1285 * Indicates the view is pressed, focused and its window has the focus. 1286 * 1287 * @see #PRESSED_STATE_SET 1288 * @see #FOCUSED_STATE_SET 1289 * @see #WINDOW_FOCUSED_STATE_SET 1290 */ 1291 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1292 /** 1293 * Indicates the view is pressed, focused and selected. 1294 * 1295 * @see #PRESSED_STATE_SET 1296 * @see #SELECTED_STATE_SET 1297 * @see #FOCUSED_STATE_SET 1298 */ 1299 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1300 /** 1301 * Indicates the view is pressed, focused, selected and its window has the focus. 1302 * 1303 * @see #PRESSED_STATE_SET 1304 * @see #FOCUSED_STATE_SET 1305 * @see #SELECTED_STATE_SET 1306 * @see #WINDOW_FOCUSED_STATE_SET 1307 */ 1308 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1309 /** 1310 * Indicates the view is pressed and enabled. 1311 * 1312 * @see #PRESSED_STATE_SET 1313 * @see #ENABLED_STATE_SET 1314 */ 1315 protected static final int[] PRESSED_ENABLED_STATE_SET; 1316 /** 1317 * Indicates the view is pressed, enabled and its window has the focus. 1318 * 1319 * @see #PRESSED_STATE_SET 1320 * @see #ENABLED_STATE_SET 1321 * @see #WINDOW_FOCUSED_STATE_SET 1322 */ 1323 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1324 /** 1325 * Indicates the view is pressed, enabled and selected. 1326 * 1327 * @see #PRESSED_STATE_SET 1328 * @see #ENABLED_STATE_SET 1329 * @see #SELECTED_STATE_SET 1330 */ 1331 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1332 /** 1333 * Indicates the view is pressed, enabled, selected and its window has the 1334 * focus. 1335 * 1336 * @see #PRESSED_STATE_SET 1337 * @see #ENABLED_STATE_SET 1338 * @see #SELECTED_STATE_SET 1339 * @see #WINDOW_FOCUSED_STATE_SET 1340 */ 1341 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1342 /** 1343 * Indicates the view is pressed, enabled and focused. 1344 * 1345 * @see #PRESSED_STATE_SET 1346 * @see #ENABLED_STATE_SET 1347 * @see #FOCUSED_STATE_SET 1348 */ 1349 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1350 /** 1351 * Indicates the view is pressed, enabled, focused and its window has the 1352 * focus. 1353 * 1354 * @see #PRESSED_STATE_SET 1355 * @see #ENABLED_STATE_SET 1356 * @see #FOCUSED_STATE_SET 1357 * @see #WINDOW_FOCUSED_STATE_SET 1358 */ 1359 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1360 /** 1361 * Indicates the view is pressed, enabled, focused and selected. 1362 * 1363 * @see #PRESSED_STATE_SET 1364 * @see #ENABLED_STATE_SET 1365 * @see #SELECTED_STATE_SET 1366 * @see #FOCUSED_STATE_SET 1367 */ 1368 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1369 /** 1370 * Indicates the view is pressed, enabled, focused, selected and its window 1371 * has the focus. 1372 * 1373 * @see #PRESSED_STATE_SET 1374 * @see #ENABLED_STATE_SET 1375 * @see #SELECTED_STATE_SET 1376 * @see #FOCUSED_STATE_SET 1377 * @see #WINDOW_FOCUSED_STATE_SET 1378 */ 1379 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1380 1381 /** 1382 * The order here is very important to {@link #getDrawableState()} 1383 */ 1384 private static final int[][] VIEW_STATE_SETS; 1385 1386 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1387 static final int VIEW_STATE_SELECTED = 1 << 1; 1388 static final int VIEW_STATE_FOCUSED = 1 << 2; 1389 static final int VIEW_STATE_ENABLED = 1 << 3; 1390 static final int VIEW_STATE_PRESSED = 1 << 4; 1391 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1392 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1393 static final int VIEW_STATE_HOVERED = 1 << 7; 1394 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1395 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1396 1397 static final int[] VIEW_STATE_IDS = new int[] { 1398 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1399 R.attr.state_selected, VIEW_STATE_SELECTED, 1400 R.attr.state_focused, VIEW_STATE_FOCUSED, 1401 R.attr.state_enabled, VIEW_STATE_ENABLED, 1402 R.attr.state_pressed, VIEW_STATE_PRESSED, 1403 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1404 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1405 R.attr.state_hovered, VIEW_STATE_HOVERED, 1406 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1407 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1408 }; 1409 1410 static { 1411 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1412 throw new IllegalStateException( 1413 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1414 } 1415 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1416 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1417 int viewState = R.styleable.ViewDrawableStates[i]; 1418 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1419 if (VIEW_STATE_IDS[j] == viewState) { 1420 orderedIds[i * 2] = viewState; 1421 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1422 } 1423 } 1424 } 1425 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1426 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1427 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1428 int numBits = Integer.bitCount(i); 1429 int[] set = new int[numBits]; 1430 int pos = 0; 1431 for (int j = 0; j < orderedIds.length; j += 2) { 1432 if ((i & orderedIds[j+1]) != 0) { 1433 set[pos++] = orderedIds[j]; 1434 } 1435 } 1436 VIEW_STATE_SETS[i] = set; 1437 } 1438 1439 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1440 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1441 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1442 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1443 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1444 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1445 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1446 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1447 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1448 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1449 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1451 | VIEW_STATE_FOCUSED]; 1452 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1453 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1454 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1455 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1456 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1457 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1459 | VIEW_STATE_ENABLED]; 1460 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1462 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1463 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1464 | VIEW_STATE_ENABLED]; 1465 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1467 | VIEW_STATE_ENABLED]; 1468 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1469 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1470 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1471 1472 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1473 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1474 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1475 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1476 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1477 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1479 | VIEW_STATE_PRESSED]; 1480 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1481 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1482 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1483 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1484 | VIEW_STATE_PRESSED]; 1485 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1486 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1487 | VIEW_STATE_PRESSED]; 1488 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1489 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1490 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1491 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1492 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1493 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1494 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1495 | VIEW_STATE_PRESSED]; 1496 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1497 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1498 | VIEW_STATE_PRESSED]; 1499 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1500 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1501 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1502 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1503 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1504 | VIEW_STATE_PRESSED]; 1505 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1506 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1507 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1508 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1509 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1510 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1511 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1512 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1513 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1514 | VIEW_STATE_PRESSED]; 1515 } 1516 1517 /** 1518 * Accessibility event types that are dispatched for text population. 1519 */ 1520 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1521 AccessibilityEvent.TYPE_VIEW_CLICKED 1522 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1523 | AccessibilityEvent.TYPE_VIEW_SELECTED 1524 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1525 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1526 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1527 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1528 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1529 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1530 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1531 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1532 1533 /** 1534 * Temporary Rect currently for use in setBackground(). This will probably 1535 * be extended in the future to hold our own class with more than just 1536 * a Rect. :) 1537 */ 1538 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1539 1540 /** 1541 * Map used to store views' tags. 1542 */ 1543 private SparseArray<Object> mKeyedTags; 1544 1545 /** 1546 * The next available accessiiblity id. 1547 */ 1548 private static int sNextAccessibilityViewId; 1549 1550 /** 1551 * The animation currently associated with this view. 1552 * @hide 1553 */ 1554 protected Animation mCurrentAnimation = null; 1555 1556 /** 1557 * Width as measured during measure pass. 1558 * {@hide} 1559 */ 1560 @ViewDebug.ExportedProperty(category = "measurement") 1561 int mMeasuredWidth; 1562 1563 /** 1564 * Height as measured during measure pass. 1565 * {@hide} 1566 */ 1567 @ViewDebug.ExportedProperty(category = "measurement") 1568 int mMeasuredHeight; 1569 1570 /** 1571 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1572 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1573 * its display list. This flag, used only when hw accelerated, allows us to clear the 1574 * flag while retaining this information until it's needed (at getDisplayList() time and 1575 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1576 * 1577 * {@hide} 1578 */ 1579 boolean mRecreateDisplayList = false; 1580 1581 /** 1582 * The view's identifier. 1583 * {@hide} 1584 * 1585 * @see #setId(int) 1586 * @see #getId() 1587 */ 1588 @ViewDebug.ExportedProperty(resolveId = true) 1589 int mID = NO_ID; 1590 1591 /** 1592 * The stable ID of this view for accessibility purposes. 1593 */ 1594 int mAccessibilityViewId = NO_ID; 1595 1596 /** 1597 * @hide 1598 */ 1599 private int mAccessibilityCursorPosition = -1; 1600 1601 /** 1602 * The view's tag. 1603 * {@hide} 1604 * 1605 * @see #setTag(Object) 1606 * @see #getTag() 1607 */ 1608 protected Object mTag; 1609 1610 // for mPrivateFlags: 1611 /** {@hide} */ 1612 static final int WANTS_FOCUS = 0x00000001; 1613 /** {@hide} */ 1614 static final int FOCUSED = 0x00000002; 1615 /** {@hide} */ 1616 static final int SELECTED = 0x00000004; 1617 /** {@hide} */ 1618 static final int IS_ROOT_NAMESPACE = 0x00000008; 1619 /** {@hide} */ 1620 static final int HAS_BOUNDS = 0x00000010; 1621 /** {@hide} */ 1622 static final int DRAWN = 0x00000020; 1623 /** 1624 * When this flag is set, this view is running an animation on behalf of its 1625 * children and should therefore not cancel invalidate requests, even if they 1626 * lie outside of this view's bounds. 1627 * 1628 * {@hide} 1629 */ 1630 static final int DRAW_ANIMATION = 0x00000040; 1631 /** {@hide} */ 1632 static final int SKIP_DRAW = 0x00000080; 1633 /** {@hide} */ 1634 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1635 /** {@hide} */ 1636 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1637 /** {@hide} */ 1638 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1639 /** {@hide} */ 1640 static final int MEASURED_DIMENSION_SET = 0x00000800; 1641 /** {@hide} */ 1642 static final int FORCE_LAYOUT = 0x00001000; 1643 /** {@hide} */ 1644 static final int LAYOUT_REQUIRED = 0x00002000; 1645 1646 private static final int PRESSED = 0x00004000; 1647 1648 /** {@hide} */ 1649 static final int DRAWING_CACHE_VALID = 0x00008000; 1650 /** 1651 * Flag used to indicate that this view should be drawn once more (and only once 1652 * more) after its animation has completed. 1653 * {@hide} 1654 */ 1655 static final int ANIMATION_STARTED = 0x00010000; 1656 1657 private static final int SAVE_STATE_CALLED = 0x00020000; 1658 1659 /** 1660 * Indicates that the View returned true when onSetAlpha() was called and that 1661 * the alpha must be restored. 1662 * {@hide} 1663 */ 1664 static final int ALPHA_SET = 0x00040000; 1665 1666 /** 1667 * Set by {@link #setScrollContainer(boolean)}. 1668 */ 1669 static final int SCROLL_CONTAINER = 0x00080000; 1670 1671 /** 1672 * Set by {@link #setScrollContainer(boolean)}. 1673 */ 1674 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1675 1676 /** 1677 * View flag indicating whether this view was invalidated (fully or partially.) 1678 * 1679 * @hide 1680 */ 1681 static final int DIRTY = 0x00200000; 1682 1683 /** 1684 * View flag indicating whether this view was invalidated by an opaque 1685 * invalidate request. 1686 * 1687 * @hide 1688 */ 1689 static final int DIRTY_OPAQUE = 0x00400000; 1690 1691 /** 1692 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1693 * 1694 * @hide 1695 */ 1696 static final int DIRTY_MASK = 0x00600000; 1697 1698 /** 1699 * Indicates whether the background is opaque. 1700 * 1701 * @hide 1702 */ 1703 static final int OPAQUE_BACKGROUND = 0x00800000; 1704 1705 /** 1706 * Indicates whether the scrollbars are opaque. 1707 * 1708 * @hide 1709 */ 1710 static final int OPAQUE_SCROLLBARS = 0x01000000; 1711 1712 /** 1713 * Indicates whether the view is opaque. 1714 * 1715 * @hide 1716 */ 1717 static final int OPAQUE_MASK = 0x01800000; 1718 1719 /** 1720 * Indicates a prepressed state; 1721 * the short time between ACTION_DOWN and recognizing 1722 * a 'real' press. Prepressed is used to recognize quick taps 1723 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1724 * 1725 * @hide 1726 */ 1727 private static final int PREPRESSED = 0x02000000; 1728 1729 /** 1730 * Indicates whether the view is temporarily detached. 1731 * 1732 * @hide 1733 */ 1734 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1735 1736 /** 1737 * Indicates that we should awaken scroll bars once attached 1738 * 1739 * @hide 1740 */ 1741 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1742 1743 /** 1744 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1745 * @hide 1746 */ 1747 private static final int HOVERED = 0x10000000; 1748 1749 /** 1750 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1751 * for transform operations 1752 * 1753 * @hide 1754 */ 1755 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1756 1757 /** {@hide} */ 1758 static final int ACTIVATED = 0x40000000; 1759 1760 /** 1761 * Indicates that this view was specifically invalidated, not just dirtied because some 1762 * child view was invalidated. The flag is used to determine when we need to recreate 1763 * a view's display list (as opposed to just returning a reference to its existing 1764 * display list). 1765 * 1766 * @hide 1767 */ 1768 static final int INVALIDATED = 0x80000000; 1769 1770 /* Masks for mPrivateFlags2 */ 1771 1772 /** 1773 * Indicates that this view has reported that it can accept the current drag's content. 1774 * Cleared when the drag operation concludes. 1775 * @hide 1776 */ 1777 static final int DRAG_CAN_ACCEPT = 0x00000001; 1778 1779 /** 1780 * Indicates that this view is currently directly under the drag location in a 1781 * drag-and-drop operation involving content that it can accept. Cleared when 1782 * the drag exits the view, or when the drag operation concludes. 1783 * @hide 1784 */ 1785 static final int DRAG_HOVERED = 0x00000002; 1786 1787 /** 1788 * Horizontal layout direction of this view is from Left to Right. 1789 * Use with {@link #setLayoutDirection}. 1790 * @hide 1791 */ 1792 public static final int LAYOUT_DIRECTION_LTR = 0; 1793 1794 /** 1795 * Horizontal layout direction of this view is from Right to Left. 1796 * Use with {@link #setLayoutDirection}. 1797 * @hide 1798 */ 1799 public static final int LAYOUT_DIRECTION_RTL = 1; 1800 1801 /** 1802 * Horizontal layout direction of this view is inherited from its parent. 1803 * Use with {@link #setLayoutDirection}. 1804 * @hide 1805 */ 1806 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1807 1808 /** 1809 * Horizontal layout direction of this view is from deduced from the default language 1810 * script for the locale. Use with {@link #setLayoutDirection}. 1811 * @hide 1812 */ 1813 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1814 1815 /** 1816 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1817 * @hide 1818 */ 1819 static final int LAYOUT_DIRECTION_MASK_SHIFT = 2; 1820 1821 /** 1822 * Mask for use with private flags indicating bits used for horizontal layout direction. 1823 * @hide 1824 */ 1825 static final int LAYOUT_DIRECTION_MASK = 0x00000003 << LAYOUT_DIRECTION_MASK_SHIFT; 1826 1827 /** 1828 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1829 * right-to-left direction. 1830 * @hide 1831 */ 1832 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 4 << LAYOUT_DIRECTION_MASK_SHIFT; 1833 1834 /** 1835 * Indicates whether the view horizontal layout direction has been resolved. 1836 * @hide 1837 */ 1838 static final int LAYOUT_DIRECTION_RESOLVED = 8 << LAYOUT_DIRECTION_MASK_SHIFT; 1839 1840 /** 1841 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1842 * @hide 1843 */ 1844 static final int LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C << LAYOUT_DIRECTION_MASK_SHIFT; 1845 1846 /* 1847 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1848 * flag value. 1849 * @hide 1850 */ 1851 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1852 LAYOUT_DIRECTION_LTR, 1853 LAYOUT_DIRECTION_RTL, 1854 LAYOUT_DIRECTION_INHERIT, 1855 LAYOUT_DIRECTION_LOCALE 1856 }; 1857 1858 /** 1859 * Default horizontal layout direction. 1860 * @hide 1861 */ 1862 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1863 1864 /** 1865 * Indicates that the view is tracking some sort of transient state 1866 * that the app should not need to be aware of, but that the framework 1867 * should take special care to preserve. 1868 * 1869 * @hide 1870 */ 1871 static final int HAS_TRANSIENT_STATE = 0x00000100; 1872 1873 1874 /** 1875 * Text direction is inherited thru {@link ViewGroup} 1876 * @hide 1877 */ 1878 public static final int TEXT_DIRECTION_INHERIT = 0; 1879 1880 /** 1881 * Text direction is using "first strong algorithm". The first strong directional character 1882 * determines the paragraph direction. If there is no strong directional character, the 1883 * paragraph direction is the view's resolved layout direction. 1884 * @hide 1885 */ 1886 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1887 1888 /** 1889 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1890 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1891 * If there are neither, the paragraph direction is the view's resolved layout direction. 1892 * @hide 1893 */ 1894 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1895 1896 /** 1897 * Text direction is forced to LTR. 1898 * @hide 1899 */ 1900 public static final int TEXT_DIRECTION_LTR = 3; 1901 1902 /** 1903 * Text direction is forced to RTL. 1904 * @hide 1905 */ 1906 public static final int TEXT_DIRECTION_RTL = 4; 1907 1908 /** 1909 * Text direction is coming from the system Locale. 1910 * @hide 1911 */ 1912 public static final int TEXT_DIRECTION_LOCALE = 5; 1913 1914 /** 1915 * Default text direction is inherited 1916 * @hide 1917 */ 1918 protected static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1919 1920 /** 1921 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1922 * @hide 1923 */ 1924 static final int TEXT_DIRECTION_MASK_SHIFT = 6; 1925 1926 /** 1927 * Mask for use with private flags indicating bits used for text direction. 1928 * @hide 1929 */ 1930 static final int TEXT_DIRECTION_MASK = 0x00000007 << TEXT_DIRECTION_MASK_SHIFT; 1931 1932 /** 1933 * Array of text direction flags for mapping attribute "textDirection" to correct 1934 * flag value. 1935 * @hide 1936 */ 1937 private static final int[] TEXT_DIRECTION_FLAGS = { 1938 TEXT_DIRECTION_INHERIT << TEXT_DIRECTION_MASK_SHIFT, 1939 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_MASK_SHIFT, 1940 TEXT_DIRECTION_ANY_RTL << TEXT_DIRECTION_MASK_SHIFT, 1941 TEXT_DIRECTION_LTR << TEXT_DIRECTION_MASK_SHIFT, 1942 TEXT_DIRECTION_RTL << TEXT_DIRECTION_MASK_SHIFT, 1943 TEXT_DIRECTION_LOCALE << TEXT_DIRECTION_MASK_SHIFT 1944 }; 1945 1946 /** 1947 * Indicates whether the view text direction has been resolved. 1948 * @hide 1949 */ 1950 static final int TEXT_DIRECTION_RESOLVED = 0x00000008 << TEXT_DIRECTION_MASK_SHIFT; 1951 1952 /** 1953 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1954 * @hide 1955 */ 1956 static final int TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1957 1958 /** 1959 * Mask for use with private flags indicating bits used for resolved text direction. 1960 * @hide 1961 */ 1962 static final int TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1963 1964 /** 1965 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1966 * @hide 1967 */ 1968 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = 1969 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1970 1971 /* 1972 * Default text alignment. The text alignment of this View is inherited from its parent. 1973 * Use with {@link #setTextAlignment(int)} 1974 * @hide 1975 */ 1976 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1977 1978 /** 1979 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1980 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1981 * 1982 * Use with {@link #setTextAlignment(int)} 1983 * @hide 1984 */ 1985 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1986 1987 /** 1988 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1989 * 1990 * Use with {@link #setTextAlignment(int)} 1991 * @hide 1992 */ 1993 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 1994 1995 /** 1996 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 1997 * 1998 * Use with {@link #setTextAlignment(int)} 1999 * @hide 2000 */ 2001 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2002 2003 /** 2004 * Center the paragraph, e.g. ALIGN_CENTER. 2005 * 2006 * Use with {@link #setTextAlignment(int)} 2007 * @hide 2008 */ 2009 public static final int TEXT_ALIGNMENT_CENTER = 4; 2010 2011 /** 2012 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2013 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2014 * 2015 * Use with {@link #setTextAlignment(int)} 2016 * @hide 2017 */ 2018 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2019 2020 /** 2021 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2022 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2023 * 2024 * Use with {@link #setTextAlignment(int)} 2025 * @hide 2026 */ 2027 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2028 2029 /** 2030 * Default text alignment is inherited 2031 * @hide 2032 */ 2033 protected static int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2034 2035 /** 2036 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2037 * @hide 2038 */ 2039 static final int TEXT_ALIGNMENT_MASK_SHIFT = 13; 2040 2041 /** 2042 * Mask for use with private flags indicating bits used for text alignment. 2043 * @hide 2044 */ 2045 static final int TEXT_ALIGNMENT_MASK = 0x00000007 << TEXT_ALIGNMENT_MASK_SHIFT; 2046 2047 /** 2048 * Array of text direction flags for mapping attribute "textAlignment" to correct 2049 * flag value. 2050 * @hide 2051 */ 2052 private static final int[] TEXT_ALIGNMENT_FLAGS = { 2053 TEXT_ALIGNMENT_INHERIT << TEXT_ALIGNMENT_MASK_SHIFT, 2054 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_MASK_SHIFT, 2055 TEXT_ALIGNMENT_TEXT_START << TEXT_ALIGNMENT_MASK_SHIFT, 2056 TEXT_ALIGNMENT_TEXT_END << TEXT_ALIGNMENT_MASK_SHIFT, 2057 TEXT_ALIGNMENT_CENTER << TEXT_ALIGNMENT_MASK_SHIFT, 2058 TEXT_ALIGNMENT_VIEW_START << TEXT_ALIGNMENT_MASK_SHIFT, 2059 TEXT_ALIGNMENT_VIEW_END << TEXT_ALIGNMENT_MASK_SHIFT 2060 }; 2061 2062 /** 2063 * Indicates whether the view text alignment has been resolved. 2064 * @hide 2065 */ 2066 static final int TEXT_ALIGNMENT_RESOLVED = 0x00000008 << TEXT_ALIGNMENT_MASK_SHIFT; 2067 2068 /** 2069 * Bit shift to get the resolved text alignment. 2070 * @hide 2071 */ 2072 static final int TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2073 2074 /** 2075 * Mask for use with private flags indicating bits used for text alignment. 2076 * @hide 2077 */ 2078 static final int TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2079 2080 /** 2081 * Indicates whether if the view text alignment has been resolved to gravity 2082 */ 2083 public static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2084 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2085 2086 // Accessiblity constants for mPrivateFlags2 2087 2088 /** 2089 * Shift for accessibility related bits in {@link #mPrivateFlags2}. 2090 */ 2091 static final int IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2092 2093 /** 2094 * Automatically determine whether a view is important for accessibility. 2095 */ 2096 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2097 2098 /** 2099 * The view is important for accessibility. 2100 */ 2101 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2102 2103 /** 2104 * The view is not important for accessibility. 2105 */ 2106 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2107 2108 /** 2109 * The default whether the view is important for accessiblity. 2110 */ 2111 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2112 2113 /** 2114 * Mask for obtainig the bits which specify how to determine 2115 * whether a view is important for accessibility. 2116 */ 2117 static final int IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2118 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2119 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2120 2121 /** 2122 * Flag indicating whether a view has accessibility focus. 2123 */ 2124 static final int ACCESSIBILITY_FOCUSED = 0x00000040 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2125 2126 /** 2127 * Flag indicating whether a view state for accessibility has changed. 2128 */ 2129 static final int ACCESSIBILITY_STATE_CHANGED = 0x00000080 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2130 2131 /* End of masks for mPrivateFlags2 */ 2132 2133 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 2134 2135 /** 2136 * Always allow a user to over-scroll this view, provided it is a 2137 * view that can scroll. 2138 * 2139 * @see #getOverScrollMode() 2140 * @see #setOverScrollMode(int) 2141 */ 2142 public static final int OVER_SCROLL_ALWAYS = 0; 2143 2144 /** 2145 * Allow a user to over-scroll this view only if the content is large 2146 * enough to meaningfully scroll, provided it is a view that can scroll. 2147 * 2148 * @see #getOverScrollMode() 2149 * @see #setOverScrollMode(int) 2150 */ 2151 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2152 2153 /** 2154 * Never allow a user to over-scroll this view. 2155 * 2156 * @see #getOverScrollMode() 2157 * @see #setOverScrollMode(int) 2158 */ 2159 public static final int OVER_SCROLL_NEVER = 2; 2160 2161 /** 2162 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2163 * requested the system UI (status bar) to be visible (the default). 2164 * 2165 * @see #setSystemUiVisibility(int) 2166 */ 2167 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2168 2169 /** 2170 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2171 * system UI to enter an unobtrusive "low profile" mode. 2172 * 2173 * <p>This is for use in games, book readers, video players, or any other 2174 * "immersive" application where the usual system chrome is deemed too distracting. 2175 * 2176 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2177 * 2178 * @see #setSystemUiVisibility(int) 2179 */ 2180 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2181 2182 /** 2183 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2184 * system navigation be temporarily hidden. 2185 * 2186 * <p>This is an even less obtrusive state than that called for by 2187 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2188 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2189 * those to disappear. This is useful (in conjunction with the 2190 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2191 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2192 * window flags) for displaying content using every last pixel on the display. 2193 * 2194 * <p>There is a limitation: because navigation controls are so important, the least user 2195 * interaction will cause them to reappear immediately. When this happens, both 2196 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2197 * so that both elements reappear at the same time. 2198 * 2199 * @see #setSystemUiVisibility(int) 2200 */ 2201 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2202 2203 /** 2204 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2205 * into the normal fullscreen mode so that its content can take over the screen 2206 * while still allowing the user to interact with the application. 2207 * 2208 * <p>This has the same visual effect as 2209 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2210 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2211 * meaning that non-critical screen decorations (such as the status bar) will be 2212 * hidden while the user is in the View's window, focusing the experience on 2213 * that content. Unlike the window flag, if you are using ActionBar in 2214 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2215 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2216 * hide the action bar. 2217 * 2218 * <p>This approach to going fullscreen is best used over the window flag when 2219 * it is a transient state -- that is, the application does this at certain 2220 * points in its user interaction where it wants to allow the user to focus 2221 * on content, but not as a continuous state. For situations where the application 2222 * would like to simply stay full screen the entire time (such as a game that 2223 * wants to take over the screen), the 2224 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2225 * is usually a better approach. The state set here will be removed by the system 2226 * in various situations (such as the user moving to another application) like 2227 * the other system UI states. 2228 * 2229 * <p>When using this flag, the application should provide some easy facility 2230 * for the user to go out of it. A common example would be in an e-book 2231 * reader, where tapping on the screen brings back whatever screen and UI 2232 * decorations that had been hidden while the user was immersed in reading 2233 * the book. 2234 * 2235 * @see #setSystemUiVisibility(int) 2236 */ 2237 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2238 2239 /** 2240 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2241 * flags, we would like a stable view of the content insets given to 2242 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2243 * will always represent the worst case that the application can expect 2244 * as a continue state. In practice this means with any of system bar, 2245 * nav bar, and status bar shown, but not the space that would be needed 2246 * for an input method. 2247 * 2248 * <p>If you are using ActionBar in 2249 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2250 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2251 * insets it adds to those given to the application. 2252 */ 2253 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2254 2255 /** 2256 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2257 * to be layed out as if it has requested 2258 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2259 * allows it to avoid artifacts when switching in and out of that mode, at 2260 * the expense that some of its user interface may be covered by screen 2261 * decorations when they are shown. You can perform layout of your inner 2262 * UI elements to account for the navagation system UI through the 2263 * {@link #fitSystemWindows(Rect)} method. 2264 */ 2265 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2266 2267 /** 2268 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2269 * to be layed out as if it has requested 2270 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2271 * allows it to avoid artifacts when switching in and out of that mode, at 2272 * the expense that some of its user interface may be covered by screen 2273 * decorations when they are shown. You can perform layout of your inner 2274 * UI elements to account for non-fullscreen system UI through the 2275 * {@link #fitSystemWindows(Rect)} method. 2276 */ 2277 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2278 2279 /** 2280 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2281 */ 2282 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2283 2284 /** 2285 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2286 */ 2287 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2288 2289 /** 2290 * @hide 2291 * 2292 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2293 * out of the public fields to keep the undefined bits out of the developer's way. 2294 * 2295 * Flag to make the status bar not expandable. Unless you also 2296 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2297 */ 2298 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2299 2300 /** 2301 * @hide 2302 * 2303 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2304 * out of the public fields to keep the undefined bits out of the developer's way. 2305 * 2306 * Flag to hide notification icons and scrolling ticker text. 2307 */ 2308 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2309 2310 /** 2311 * @hide 2312 * 2313 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2314 * out of the public fields to keep the undefined bits out of the developer's way. 2315 * 2316 * Flag to disable incoming notification alerts. This will not block 2317 * icons, but it will block sound, vibrating and other visual or aural notifications. 2318 */ 2319 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2320 2321 /** 2322 * @hide 2323 * 2324 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2325 * out of the public fields to keep the undefined bits out of the developer's way. 2326 * 2327 * Flag to hide only the scrolling ticker. Note that 2328 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2329 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2330 */ 2331 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2332 2333 /** 2334 * @hide 2335 * 2336 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2337 * out of the public fields to keep the undefined bits out of the developer's way. 2338 * 2339 * Flag to hide the center system info area. 2340 */ 2341 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2342 2343 /** 2344 * @hide 2345 * 2346 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2347 * out of the public fields to keep the undefined bits out of the developer's way. 2348 * 2349 * Flag to hide only the home button. Don't use this 2350 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2351 */ 2352 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2353 2354 /** 2355 * @hide 2356 * 2357 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2358 * out of the public fields to keep the undefined bits out of the developer's way. 2359 * 2360 * Flag to hide only the back button. Don't use this 2361 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2362 */ 2363 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2364 2365 /** 2366 * @hide 2367 * 2368 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2369 * out of the public fields to keep the undefined bits out of the developer's way. 2370 * 2371 * Flag to hide only the clock. You might use this if your activity has 2372 * its own clock making the status bar's clock redundant. 2373 */ 2374 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2375 2376 /** 2377 * @hide 2378 * 2379 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2380 * out of the public fields to keep the undefined bits out of the developer's way. 2381 * 2382 * Flag to hide only the recent apps button. Don't use this 2383 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2384 */ 2385 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2386 2387 /** 2388 * @hide 2389 */ 2390 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2391 2392 /** 2393 * These are the system UI flags that can be cleared by events outside 2394 * of an application. Currently this is just the ability to tap on the 2395 * screen while hiding the navigation bar to have it return. 2396 * @hide 2397 */ 2398 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2399 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2400 | SYSTEM_UI_FLAG_FULLSCREEN; 2401 2402 /** 2403 * Flags that can impact the layout in relation to system UI. 2404 */ 2405 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2406 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2407 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2408 2409 /** 2410 * Find views that render the specified text. 2411 * 2412 * @see #findViewsWithText(ArrayList, CharSequence, int) 2413 */ 2414 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2415 2416 /** 2417 * Find find views that contain the specified content description. 2418 * 2419 * @see #findViewsWithText(ArrayList, CharSequence, int) 2420 */ 2421 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2422 2423 /** 2424 * Find views that contain {@link AccessibilityNodeProvider}. Such 2425 * a View is a root of virtual view hierarchy and may contain the searched 2426 * text. If this flag is set Views with providers are automatically 2427 * added and it is a responsibility of the client to call the APIs of 2428 * the provider to determine whether the virtual tree rooted at this View 2429 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2430 * represeting the virtual views with this text. 2431 * 2432 * @see #findViewsWithText(ArrayList, CharSequence, int) 2433 * 2434 * @hide 2435 */ 2436 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2437 2438 /** 2439 * Indicates that the screen has changed state and is now off. 2440 * 2441 * @see #onScreenStateChanged(int) 2442 */ 2443 public static final int SCREEN_STATE_OFF = 0x0; 2444 2445 /** 2446 * Indicates that the screen has changed state and is now on. 2447 * 2448 * @see #onScreenStateChanged(int) 2449 */ 2450 public static final int SCREEN_STATE_ON = 0x1; 2451 2452 /** 2453 * Controls the over-scroll mode for this view. 2454 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2455 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2456 * and {@link #OVER_SCROLL_NEVER}. 2457 */ 2458 private int mOverScrollMode; 2459 2460 /** 2461 * The parent this view is attached to. 2462 * {@hide} 2463 * 2464 * @see #getParent() 2465 */ 2466 protected ViewParent mParent; 2467 2468 /** 2469 * {@hide} 2470 */ 2471 AttachInfo mAttachInfo; 2472 2473 /** 2474 * {@hide} 2475 */ 2476 @ViewDebug.ExportedProperty(flagMapping = { 2477 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2478 name = "FORCE_LAYOUT"), 2479 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2480 name = "LAYOUT_REQUIRED"), 2481 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2482 name = "DRAWING_CACHE_INVALID", outputIf = false), 2483 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2484 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2485 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2486 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2487 }) 2488 int mPrivateFlags; 2489 int mPrivateFlags2; 2490 2491 /** 2492 * This view's request for the visibility of the status bar. 2493 * @hide 2494 */ 2495 @ViewDebug.ExportedProperty(flagMapping = { 2496 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2497 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2498 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2499 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2500 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2501 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2502 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2503 equals = SYSTEM_UI_FLAG_VISIBLE, 2504 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2505 }) 2506 int mSystemUiVisibility; 2507 2508 /** 2509 * Reference count for transient state. 2510 * @see #setHasTransientState(boolean) 2511 */ 2512 int mTransientStateCount = 0; 2513 2514 /** 2515 * Count of how many windows this view has been attached to. 2516 */ 2517 int mWindowAttachCount; 2518 2519 /** 2520 * The layout parameters associated with this view and used by the parent 2521 * {@link android.view.ViewGroup} to determine how this view should be 2522 * laid out. 2523 * {@hide} 2524 */ 2525 protected ViewGroup.LayoutParams mLayoutParams; 2526 2527 /** 2528 * The view flags hold various views states. 2529 * {@hide} 2530 */ 2531 @ViewDebug.ExportedProperty 2532 int mViewFlags; 2533 2534 static class TransformationInfo { 2535 /** 2536 * The transform matrix for the View. This transform is calculated internally 2537 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2538 * is used by default. Do *not* use this variable directly; instead call 2539 * getMatrix(), which will automatically recalculate the matrix if necessary 2540 * to get the correct matrix based on the latest rotation and scale properties. 2541 */ 2542 private final Matrix mMatrix = new Matrix(); 2543 2544 /** 2545 * The transform matrix for the View. This transform is calculated internally 2546 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2547 * is used by default. Do *not* use this variable directly; instead call 2548 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2549 * to get the correct matrix based on the latest rotation and scale properties. 2550 */ 2551 private Matrix mInverseMatrix; 2552 2553 /** 2554 * An internal variable that tracks whether we need to recalculate the 2555 * transform matrix, based on whether the rotation or scaleX/Y properties 2556 * have changed since the matrix was last calculated. 2557 */ 2558 boolean mMatrixDirty = false; 2559 2560 /** 2561 * An internal variable that tracks whether we need to recalculate the 2562 * transform matrix, based on whether the rotation or scaleX/Y properties 2563 * have changed since the matrix was last calculated. 2564 */ 2565 private boolean mInverseMatrixDirty = true; 2566 2567 /** 2568 * A variable that tracks whether we need to recalculate the 2569 * transform matrix, based on whether the rotation or scaleX/Y properties 2570 * have changed since the matrix was last calculated. This variable 2571 * is only valid after a call to updateMatrix() or to a function that 2572 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2573 */ 2574 private boolean mMatrixIsIdentity = true; 2575 2576 /** 2577 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2578 */ 2579 private Camera mCamera = null; 2580 2581 /** 2582 * This matrix is used when computing the matrix for 3D rotations. 2583 */ 2584 private Matrix matrix3D = null; 2585 2586 /** 2587 * These prev values are used to recalculate a centered pivot point when necessary. The 2588 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2589 * set), so thes values are only used then as well. 2590 */ 2591 private int mPrevWidth = -1; 2592 private int mPrevHeight = -1; 2593 2594 /** 2595 * The degrees rotation around the vertical axis through the pivot point. 2596 */ 2597 @ViewDebug.ExportedProperty 2598 float mRotationY = 0f; 2599 2600 /** 2601 * The degrees rotation around the horizontal axis through the pivot point. 2602 */ 2603 @ViewDebug.ExportedProperty 2604 float mRotationX = 0f; 2605 2606 /** 2607 * The degrees rotation around the pivot point. 2608 */ 2609 @ViewDebug.ExportedProperty 2610 float mRotation = 0f; 2611 2612 /** 2613 * The amount of translation of the object away from its left property (post-layout). 2614 */ 2615 @ViewDebug.ExportedProperty 2616 float mTranslationX = 0f; 2617 2618 /** 2619 * The amount of translation of the object away from its top property (post-layout). 2620 */ 2621 @ViewDebug.ExportedProperty 2622 float mTranslationY = 0f; 2623 2624 /** 2625 * The amount of scale in the x direction around the pivot point. A 2626 * value of 1 means no scaling is applied. 2627 */ 2628 @ViewDebug.ExportedProperty 2629 float mScaleX = 1f; 2630 2631 /** 2632 * The amount of scale in the y direction around the pivot point. A 2633 * value of 1 means no scaling is applied. 2634 */ 2635 @ViewDebug.ExportedProperty 2636 float mScaleY = 1f; 2637 2638 /** 2639 * The x location of the point around which the view is rotated and scaled. 2640 */ 2641 @ViewDebug.ExportedProperty 2642 float mPivotX = 0f; 2643 2644 /** 2645 * The y location of the point around which the view is rotated and scaled. 2646 */ 2647 @ViewDebug.ExportedProperty 2648 float mPivotY = 0f; 2649 2650 /** 2651 * The opacity of the View. This is a value from 0 to 1, where 0 means 2652 * completely transparent and 1 means completely opaque. 2653 */ 2654 @ViewDebug.ExportedProperty 2655 float mAlpha = 1f; 2656 } 2657 2658 TransformationInfo mTransformationInfo; 2659 2660 private boolean mLastIsOpaque; 2661 2662 /** 2663 * Convenience value to check for float values that are close enough to zero to be considered 2664 * zero. 2665 */ 2666 private static final float NONZERO_EPSILON = .001f; 2667 2668 /** 2669 * The distance in pixels from the left edge of this view's parent 2670 * to the left edge of this view. 2671 * {@hide} 2672 */ 2673 @ViewDebug.ExportedProperty(category = "layout") 2674 protected int mLeft; 2675 /** 2676 * The distance in pixels from the left edge of this view's parent 2677 * to the right edge of this view. 2678 * {@hide} 2679 */ 2680 @ViewDebug.ExportedProperty(category = "layout") 2681 protected int mRight; 2682 /** 2683 * The distance in pixels from the top edge of this view's parent 2684 * to the top edge of this view. 2685 * {@hide} 2686 */ 2687 @ViewDebug.ExportedProperty(category = "layout") 2688 protected int mTop; 2689 /** 2690 * The distance in pixels from the top edge of this view's parent 2691 * to the bottom edge of this view. 2692 * {@hide} 2693 */ 2694 @ViewDebug.ExportedProperty(category = "layout") 2695 protected int mBottom; 2696 2697 /** 2698 * The offset, in pixels, by which the content of this view is scrolled 2699 * horizontally. 2700 * {@hide} 2701 */ 2702 @ViewDebug.ExportedProperty(category = "scrolling") 2703 protected int mScrollX; 2704 /** 2705 * The offset, in pixels, by which the content of this view is scrolled 2706 * vertically. 2707 * {@hide} 2708 */ 2709 @ViewDebug.ExportedProperty(category = "scrolling") 2710 protected int mScrollY; 2711 2712 /** 2713 * The left padding in pixels, that is the distance in pixels between the 2714 * left edge of this view and the left edge of its content. 2715 * {@hide} 2716 */ 2717 @ViewDebug.ExportedProperty(category = "padding") 2718 protected int mPaddingLeft; 2719 /** 2720 * The right padding in pixels, that is the distance in pixels between the 2721 * right edge of this view and the right edge of its content. 2722 * {@hide} 2723 */ 2724 @ViewDebug.ExportedProperty(category = "padding") 2725 protected int mPaddingRight; 2726 /** 2727 * The top padding in pixels, that is the distance in pixels between the 2728 * top edge of this view and the top edge of its content. 2729 * {@hide} 2730 */ 2731 @ViewDebug.ExportedProperty(category = "padding") 2732 protected int mPaddingTop; 2733 /** 2734 * The bottom padding in pixels, that is the distance in pixels between the 2735 * bottom edge of this view and the bottom edge of its content. 2736 * {@hide} 2737 */ 2738 @ViewDebug.ExportedProperty(category = "padding") 2739 protected int mPaddingBottom; 2740 2741 /** 2742 * The layout insets in pixels, that is the distance in pixels between the 2743 * visible edges of this view its bounds. 2744 */ 2745 private Insets mLayoutInsets; 2746 2747 /** 2748 * Briefly describes the view and is primarily used for accessibility support. 2749 */ 2750 private CharSequence mContentDescription; 2751 2752 /** 2753 * Cache the paddingRight set by the user to append to the scrollbar's size. 2754 * 2755 * @hide 2756 */ 2757 @ViewDebug.ExportedProperty(category = "padding") 2758 protected int mUserPaddingRight; 2759 2760 /** 2761 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2762 * 2763 * @hide 2764 */ 2765 @ViewDebug.ExportedProperty(category = "padding") 2766 protected int mUserPaddingBottom; 2767 2768 /** 2769 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2770 * 2771 * @hide 2772 */ 2773 @ViewDebug.ExportedProperty(category = "padding") 2774 protected int mUserPaddingLeft; 2775 2776 /** 2777 * Cache if the user padding is relative. 2778 * 2779 */ 2780 @ViewDebug.ExportedProperty(category = "padding") 2781 boolean mUserPaddingRelative; 2782 2783 /** 2784 * Cache the paddingStart set by the user to append to the scrollbar's size. 2785 * 2786 */ 2787 @ViewDebug.ExportedProperty(category = "padding") 2788 int mUserPaddingStart; 2789 2790 /** 2791 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2792 * 2793 */ 2794 @ViewDebug.ExportedProperty(category = "padding") 2795 int mUserPaddingEnd; 2796 2797 /** 2798 * @hide 2799 */ 2800 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2801 /** 2802 * @hide 2803 */ 2804 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2805 2806 private Drawable mBackground; 2807 2808 private int mBackgroundResource; 2809 private boolean mBackgroundSizeChanged; 2810 2811 static class ListenerInfo { 2812 /** 2813 * Listener used to dispatch focus change events. 2814 * This field should be made private, so it is hidden from the SDK. 2815 * {@hide} 2816 */ 2817 protected OnFocusChangeListener mOnFocusChangeListener; 2818 2819 /** 2820 * Listeners for layout change events. 2821 */ 2822 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2823 2824 /** 2825 * Listeners for attach events. 2826 */ 2827 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2828 2829 /** 2830 * Listener used to dispatch click events. 2831 * This field should be made private, so it is hidden from the SDK. 2832 * {@hide} 2833 */ 2834 public OnClickListener mOnClickListener; 2835 2836 /** 2837 * Listener used to dispatch long click events. 2838 * This field should be made private, so it is hidden from the SDK. 2839 * {@hide} 2840 */ 2841 protected OnLongClickListener mOnLongClickListener; 2842 2843 /** 2844 * Listener used to build the context menu. 2845 * This field should be made private, so it is hidden from the SDK. 2846 * {@hide} 2847 */ 2848 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2849 2850 private OnKeyListener mOnKeyListener; 2851 2852 private OnTouchListener mOnTouchListener; 2853 2854 private OnHoverListener mOnHoverListener; 2855 2856 private OnGenericMotionListener mOnGenericMotionListener; 2857 2858 private OnDragListener mOnDragListener; 2859 2860 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2861 } 2862 2863 ListenerInfo mListenerInfo; 2864 2865 /** 2866 * The application environment this view lives in. 2867 * This field should be made private, so it is hidden from the SDK. 2868 * {@hide} 2869 */ 2870 protected Context mContext; 2871 2872 private final Resources mResources; 2873 2874 private ScrollabilityCache mScrollCache; 2875 2876 private int[] mDrawableState = null; 2877 2878 /** 2879 * Set to true when drawing cache is enabled and cannot be created. 2880 * 2881 * @hide 2882 */ 2883 public boolean mCachingFailed; 2884 2885 private Bitmap mDrawingCache; 2886 private Bitmap mUnscaledDrawingCache; 2887 private HardwareLayer mHardwareLayer; 2888 DisplayList mDisplayList; 2889 2890 /** 2891 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2892 * the user may specify which view to go to next. 2893 */ 2894 private int mNextFocusLeftId = View.NO_ID; 2895 2896 /** 2897 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2898 * the user may specify which view to go to next. 2899 */ 2900 private int mNextFocusRightId = View.NO_ID; 2901 2902 /** 2903 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2904 * the user may specify which view to go to next. 2905 */ 2906 private int mNextFocusUpId = View.NO_ID; 2907 2908 /** 2909 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2910 * the user may specify which view to go to next. 2911 */ 2912 private int mNextFocusDownId = View.NO_ID; 2913 2914 /** 2915 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2916 * the user may specify which view to go to next. 2917 */ 2918 int mNextFocusForwardId = View.NO_ID; 2919 2920 private CheckForLongPress mPendingCheckForLongPress; 2921 private CheckForTap mPendingCheckForTap = null; 2922 private PerformClick mPerformClick; 2923 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2924 2925 private UnsetPressedState mUnsetPressedState; 2926 2927 /** 2928 * Whether the long press's action has been invoked. The tap's action is invoked on the 2929 * up event while a long press is invoked as soon as the long press duration is reached, so 2930 * a long press could be performed before the tap is checked, in which case the tap's action 2931 * should not be invoked. 2932 */ 2933 private boolean mHasPerformedLongPress; 2934 2935 /** 2936 * The minimum height of the view. We'll try our best to have the height 2937 * of this view to at least this amount. 2938 */ 2939 @ViewDebug.ExportedProperty(category = "measurement") 2940 private int mMinHeight; 2941 2942 /** 2943 * The minimum width of the view. We'll try our best to have the width 2944 * of this view to at least this amount. 2945 */ 2946 @ViewDebug.ExportedProperty(category = "measurement") 2947 private int mMinWidth; 2948 2949 /** 2950 * The delegate to handle touch events that are physically in this view 2951 * but should be handled by another view. 2952 */ 2953 private TouchDelegate mTouchDelegate = null; 2954 2955 /** 2956 * Solid color to use as a background when creating the drawing cache. Enables 2957 * the cache to use 16 bit bitmaps instead of 32 bit. 2958 */ 2959 private int mDrawingCacheBackgroundColor = 0; 2960 2961 /** 2962 * Special tree observer used when mAttachInfo is null. 2963 */ 2964 private ViewTreeObserver mFloatingTreeObserver; 2965 2966 /** 2967 * Cache the touch slop from the context that created the view. 2968 */ 2969 private int mTouchSlop; 2970 2971 /** 2972 * Object that handles automatic animation of view properties. 2973 */ 2974 private ViewPropertyAnimator mAnimator = null; 2975 2976 /** 2977 * Flag indicating that a drag can cross window boundaries. When 2978 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2979 * with this flag set, all visible applications will be able to participate 2980 * in the drag operation and receive the dragged content. 2981 * 2982 * @hide 2983 */ 2984 public static final int DRAG_FLAG_GLOBAL = 1; 2985 2986 /** 2987 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2988 */ 2989 private float mVerticalScrollFactor; 2990 2991 /** 2992 * Position of the vertical scroll bar. 2993 */ 2994 private int mVerticalScrollbarPosition; 2995 2996 /** 2997 * Position the scroll bar at the default position as determined by the system. 2998 */ 2999 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3000 3001 /** 3002 * Position the scroll bar along the left edge. 3003 */ 3004 public static final int SCROLLBAR_POSITION_LEFT = 1; 3005 3006 /** 3007 * Position the scroll bar along the right edge. 3008 */ 3009 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3010 3011 /** 3012 * Indicates that the view does not have a layer. 3013 * 3014 * @see #getLayerType() 3015 * @see #setLayerType(int, android.graphics.Paint) 3016 * @see #LAYER_TYPE_SOFTWARE 3017 * @see #LAYER_TYPE_HARDWARE 3018 */ 3019 public static final int LAYER_TYPE_NONE = 0; 3020 3021 /** 3022 * <p>Indicates that the view has a software layer. A software layer is backed 3023 * by a bitmap and causes the view to be rendered using Android's software 3024 * rendering pipeline, even if hardware acceleration is enabled.</p> 3025 * 3026 * <p>Software layers have various usages:</p> 3027 * <p>When the application is not using hardware acceleration, a software layer 3028 * is useful to apply a specific color filter and/or blending mode and/or 3029 * translucency to a view and all its children.</p> 3030 * <p>When the application is using hardware acceleration, a software layer 3031 * is useful to render drawing primitives not supported by the hardware 3032 * accelerated pipeline. It can also be used to cache a complex view tree 3033 * into a texture and reduce the complexity of drawing operations. For instance, 3034 * when animating a complex view tree with a translation, a software layer can 3035 * be used to render the view tree only once.</p> 3036 * <p>Software layers should be avoided when the affected view tree updates 3037 * often. Every update will require to re-render the software layer, which can 3038 * potentially be slow (particularly when hardware acceleration is turned on 3039 * since the layer will have to be uploaded into a hardware texture after every 3040 * update.)</p> 3041 * 3042 * @see #getLayerType() 3043 * @see #setLayerType(int, android.graphics.Paint) 3044 * @see #LAYER_TYPE_NONE 3045 * @see #LAYER_TYPE_HARDWARE 3046 */ 3047 public static final int LAYER_TYPE_SOFTWARE = 1; 3048 3049 /** 3050 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3051 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3052 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3053 * rendering pipeline, but only if hardware acceleration is turned on for the 3054 * view hierarchy. When hardware acceleration is turned off, hardware layers 3055 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3056 * 3057 * <p>A hardware layer is useful to apply a specific color filter and/or 3058 * blending mode and/or translucency to a view and all its children.</p> 3059 * <p>A hardware layer can be used to cache a complex view tree into a 3060 * texture and reduce the complexity of drawing operations. For instance, 3061 * when animating a complex view tree with a translation, a hardware layer can 3062 * be used to render the view tree only once.</p> 3063 * <p>A hardware layer can also be used to increase the rendering quality when 3064 * rotation transformations are applied on a view. It can also be used to 3065 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3066 * 3067 * @see #getLayerType() 3068 * @see #setLayerType(int, android.graphics.Paint) 3069 * @see #LAYER_TYPE_NONE 3070 * @see #LAYER_TYPE_SOFTWARE 3071 */ 3072 public static final int LAYER_TYPE_HARDWARE = 2; 3073 3074 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3075 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3076 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3077 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3078 }) 3079 int mLayerType = LAYER_TYPE_NONE; 3080 Paint mLayerPaint; 3081 Rect mLocalDirtyRect; 3082 3083 /** 3084 * Set to true when the view is sending hover accessibility events because it 3085 * is the innermost hovered view. 3086 */ 3087 private boolean mSendingHoverAccessibilityEvents; 3088 3089 /** 3090 * Simple constructor to use when creating a view from code. 3091 * 3092 * @param context The Context the view is running in, through which it can 3093 * access the current theme, resources, etc. 3094 */ 3095 public View(Context context) { 3096 mContext = context; 3097 mResources = context != null ? context.getResources() : null; 3098 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3099 // Set layout and text direction defaults 3100 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3101 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3102 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3103 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3104 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3105 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3106 mUserPaddingStart = -1; 3107 mUserPaddingEnd = -1; 3108 mUserPaddingRelative = false; 3109 } 3110 3111 /** 3112 * Delegate for injecting accessiblity functionality. 3113 */ 3114 AccessibilityDelegate mAccessibilityDelegate; 3115 3116 /** 3117 * Consistency verifier for debugging purposes. 3118 * @hide 3119 */ 3120 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3121 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3122 new InputEventConsistencyVerifier(this, 0) : null; 3123 3124 /** 3125 * Constructor that is called when inflating a view from XML. This is called 3126 * when a view is being constructed from an XML file, supplying attributes 3127 * that were specified in the XML file. This version uses a default style of 3128 * 0, so the only attribute values applied are those in the Context's Theme 3129 * and the given AttributeSet. 3130 * 3131 * <p> 3132 * The method onFinishInflate() will be called after all children have been 3133 * added. 3134 * 3135 * @param context The Context the view is running in, through which it can 3136 * access the current theme, resources, etc. 3137 * @param attrs The attributes of the XML tag that is inflating the view. 3138 * @see #View(Context, AttributeSet, int) 3139 */ 3140 public View(Context context, AttributeSet attrs) { 3141 this(context, attrs, 0); 3142 } 3143 3144 /** 3145 * Perform inflation from XML and apply a class-specific base style. This 3146 * constructor of View allows subclasses to use their own base style when 3147 * they are inflating. For example, a Button class's constructor would call 3148 * this version of the super class constructor and supply 3149 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3150 * the theme's button style to modify all of the base view attributes (in 3151 * particular its background) as well as the Button class's attributes. 3152 * 3153 * @param context The Context the view is running in, through which it can 3154 * access the current theme, resources, etc. 3155 * @param attrs The attributes of the XML tag that is inflating the view. 3156 * @param defStyle The default style to apply to this view. If 0, no style 3157 * will be applied (beyond what is included in the theme). This may 3158 * either be an attribute resource, whose value will be retrieved 3159 * from the current theme, or an explicit style resource. 3160 * @see #View(Context, AttributeSet) 3161 */ 3162 public View(Context context, AttributeSet attrs, int defStyle) { 3163 this(context); 3164 3165 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3166 defStyle, 0); 3167 3168 Drawable background = null; 3169 3170 int leftPadding = -1; 3171 int topPadding = -1; 3172 int rightPadding = -1; 3173 int bottomPadding = -1; 3174 int startPadding = -1; 3175 int endPadding = -1; 3176 3177 int padding = -1; 3178 3179 int viewFlagValues = 0; 3180 int viewFlagMasks = 0; 3181 3182 boolean setScrollContainer = false; 3183 3184 int x = 0; 3185 int y = 0; 3186 3187 float tx = 0; 3188 float ty = 0; 3189 float rotation = 0; 3190 float rotationX = 0; 3191 float rotationY = 0; 3192 float sx = 1f; 3193 float sy = 1f; 3194 boolean transformSet = false; 3195 3196 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3197 3198 int overScrollMode = mOverScrollMode; 3199 final int N = a.getIndexCount(); 3200 for (int i = 0; i < N; i++) { 3201 int attr = a.getIndex(i); 3202 switch (attr) { 3203 case com.android.internal.R.styleable.View_background: 3204 background = a.getDrawable(attr); 3205 break; 3206 case com.android.internal.R.styleable.View_padding: 3207 padding = a.getDimensionPixelSize(attr, -1); 3208 break; 3209 case com.android.internal.R.styleable.View_paddingLeft: 3210 leftPadding = a.getDimensionPixelSize(attr, -1); 3211 break; 3212 case com.android.internal.R.styleable.View_paddingTop: 3213 topPadding = a.getDimensionPixelSize(attr, -1); 3214 break; 3215 case com.android.internal.R.styleable.View_paddingRight: 3216 rightPadding = a.getDimensionPixelSize(attr, -1); 3217 break; 3218 case com.android.internal.R.styleable.View_paddingBottom: 3219 bottomPadding = a.getDimensionPixelSize(attr, -1); 3220 break; 3221 case com.android.internal.R.styleable.View_paddingStart: 3222 startPadding = a.getDimensionPixelSize(attr, -1); 3223 break; 3224 case com.android.internal.R.styleable.View_paddingEnd: 3225 endPadding = a.getDimensionPixelSize(attr, -1); 3226 break; 3227 case com.android.internal.R.styleable.View_scrollX: 3228 x = a.getDimensionPixelOffset(attr, 0); 3229 break; 3230 case com.android.internal.R.styleable.View_scrollY: 3231 y = a.getDimensionPixelOffset(attr, 0); 3232 break; 3233 case com.android.internal.R.styleable.View_alpha: 3234 setAlpha(a.getFloat(attr, 1f)); 3235 break; 3236 case com.android.internal.R.styleable.View_transformPivotX: 3237 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3238 break; 3239 case com.android.internal.R.styleable.View_transformPivotY: 3240 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3241 break; 3242 case com.android.internal.R.styleable.View_translationX: 3243 tx = a.getDimensionPixelOffset(attr, 0); 3244 transformSet = true; 3245 break; 3246 case com.android.internal.R.styleable.View_translationY: 3247 ty = a.getDimensionPixelOffset(attr, 0); 3248 transformSet = true; 3249 break; 3250 case com.android.internal.R.styleable.View_rotation: 3251 rotation = a.getFloat(attr, 0); 3252 transformSet = true; 3253 break; 3254 case com.android.internal.R.styleable.View_rotationX: 3255 rotationX = a.getFloat(attr, 0); 3256 transformSet = true; 3257 break; 3258 case com.android.internal.R.styleable.View_rotationY: 3259 rotationY = a.getFloat(attr, 0); 3260 transformSet = true; 3261 break; 3262 case com.android.internal.R.styleable.View_scaleX: 3263 sx = a.getFloat(attr, 1f); 3264 transformSet = true; 3265 break; 3266 case com.android.internal.R.styleable.View_scaleY: 3267 sy = a.getFloat(attr, 1f); 3268 transformSet = true; 3269 break; 3270 case com.android.internal.R.styleable.View_id: 3271 mID = a.getResourceId(attr, NO_ID); 3272 break; 3273 case com.android.internal.R.styleable.View_tag: 3274 mTag = a.getText(attr); 3275 break; 3276 case com.android.internal.R.styleable.View_fitsSystemWindows: 3277 if (a.getBoolean(attr, false)) { 3278 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3279 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3280 } 3281 break; 3282 case com.android.internal.R.styleable.View_focusable: 3283 if (a.getBoolean(attr, false)) { 3284 viewFlagValues |= FOCUSABLE; 3285 viewFlagMasks |= FOCUSABLE_MASK; 3286 } 3287 break; 3288 case com.android.internal.R.styleable.View_focusableInTouchMode: 3289 if (a.getBoolean(attr, false)) { 3290 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3291 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3292 } 3293 break; 3294 case com.android.internal.R.styleable.View_clickable: 3295 if (a.getBoolean(attr, false)) { 3296 viewFlagValues |= CLICKABLE; 3297 viewFlagMasks |= CLICKABLE; 3298 } 3299 break; 3300 case com.android.internal.R.styleable.View_longClickable: 3301 if (a.getBoolean(attr, false)) { 3302 viewFlagValues |= LONG_CLICKABLE; 3303 viewFlagMasks |= LONG_CLICKABLE; 3304 } 3305 break; 3306 case com.android.internal.R.styleable.View_saveEnabled: 3307 if (!a.getBoolean(attr, true)) { 3308 viewFlagValues |= SAVE_DISABLED; 3309 viewFlagMasks |= SAVE_DISABLED_MASK; 3310 } 3311 break; 3312 case com.android.internal.R.styleable.View_duplicateParentState: 3313 if (a.getBoolean(attr, false)) { 3314 viewFlagValues |= DUPLICATE_PARENT_STATE; 3315 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3316 } 3317 break; 3318 case com.android.internal.R.styleable.View_visibility: 3319 final int visibility = a.getInt(attr, 0); 3320 if (visibility != 0) { 3321 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3322 viewFlagMasks |= VISIBILITY_MASK; 3323 } 3324 break; 3325 case com.android.internal.R.styleable.View_layoutDirection: 3326 // Clear any layout direction flags (included resolved bits) already set 3327 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3328 // Set the layout direction flags depending on the value of the attribute 3329 final int layoutDirection = a.getInt(attr, -1); 3330 final int value = (layoutDirection != -1) ? 3331 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3332 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3333 break; 3334 case com.android.internal.R.styleable.View_drawingCacheQuality: 3335 final int cacheQuality = a.getInt(attr, 0); 3336 if (cacheQuality != 0) { 3337 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3338 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3339 } 3340 break; 3341 case com.android.internal.R.styleable.View_contentDescription: 3342 mContentDescription = a.getString(attr); 3343 break; 3344 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3345 if (!a.getBoolean(attr, true)) { 3346 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3347 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3348 } 3349 break; 3350 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3351 if (!a.getBoolean(attr, true)) { 3352 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3353 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3354 } 3355 break; 3356 case R.styleable.View_scrollbars: 3357 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3358 if (scrollbars != SCROLLBARS_NONE) { 3359 viewFlagValues |= scrollbars; 3360 viewFlagMasks |= SCROLLBARS_MASK; 3361 initializeScrollbars(a); 3362 } 3363 break; 3364 //noinspection deprecation 3365 case R.styleable.View_fadingEdge: 3366 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3367 // Ignore the attribute starting with ICS 3368 break; 3369 } 3370 // With builds < ICS, fall through and apply fading edges 3371 case R.styleable.View_requiresFadingEdge: 3372 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3373 if (fadingEdge != FADING_EDGE_NONE) { 3374 viewFlagValues |= fadingEdge; 3375 viewFlagMasks |= FADING_EDGE_MASK; 3376 initializeFadingEdge(a); 3377 } 3378 break; 3379 case R.styleable.View_scrollbarStyle: 3380 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3381 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3382 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3383 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3384 } 3385 break; 3386 case R.styleable.View_isScrollContainer: 3387 setScrollContainer = true; 3388 if (a.getBoolean(attr, false)) { 3389 setScrollContainer(true); 3390 } 3391 break; 3392 case com.android.internal.R.styleable.View_keepScreenOn: 3393 if (a.getBoolean(attr, false)) { 3394 viewFlagValues |= KEEP_SCREEN_ON; 3395 viewFlagMasks |= KEEP_SCREEN_ON; 3396 } 3397 break; 3398 case R.styleable.View_filterTouchesWhenObscured: 3399 if (a.getBoolean(attr, false)) { 3400 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3401 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3402 } 3403 break; 3404 case R.styleable.View_nextFocusLeft: 3405 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3406 break; 3407 case R.styleable.View_nextFocusRight: 3408 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3409 break; 3410 case R.styleable.View_nextFocusUp: 3411 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3412 break; 3413 case R.styleable.View_nextFocusDown: 3414 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3415 break; 3416 case R.styleable.View_nextFocusForward: 3417 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3418 break; 3419 case R.styleable.View_minWidth: 3420 mMinWidth = a.getDimensionPixelSize(attr, 0); 3421 break; 3422 case R.styleable.View_minHeight: 3423 mMinHeight = a.getDimensionPixelSize(attr, 0); 3424 break; 3425 case R.styleable.View_onClick: 3426 if (context.isRestricted()) { 3427 throw new IllegalStateException("The android:onClick attribute cannot " 3428 + "be used within a restricted context"); 3429 } 3430 3431 final String handlerName = a.getString(attr); 3432 if (handlerName != null) { 3433 setOnClickListener(new OnClickListener() { 3434 private Method mHandler; 3435 3436 public void onClick(View v) { 3437 if (mHandler == null) { 3438 try { 3439 mHandler = getContext().getClass().getMethod(handlerName, 3440 View.class); 3441 } catch (NoSuchMethodException e) { 3442 int id = getId(); 3443 String idText = id == NO_ID ? "" : " with id '" 3444 + getContext().getResources().getResourceEntryName( 3445 id) + "'"; 3446 throw new IllegalStateException("Could not find a method " + 3447 handlerName + "(View) in the activity " 3448 + getContext().getClass() + " for onClick handler" 3449 + " on view " + View.this.getClass() + idText, e); 3450 } 3451 } 3452 3453 try { 3454 mHandler.invoke(getContext(), View.this); 3455 } catch (IllegalAccessException e) { 3456 throw new IllegalStateException("Could not execute non " 3457 + "public method of the activity", e); 3458 } catch (InvocationTargetException e) { 3459 throw new IllegalStateException("Could not execute " 3460 + "method of the activity", e); 3461 } 3462 } 3463 }); 3464 } 3465 break; 3466 case R.styleable.View_overScrollMode: 3467 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3468 break; 3469 case R.styleable.View_verticalScrollbarPosition: 3470 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3471 break; 3472 case R.styleable.View_layerType: 3473 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3474 break; 3475 case R.styleable.View_textDirection: 3476 // Clear any text direction flag already set 3477 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3478 // Set the text direction flags depending on the value of the attribute 3479 final int textDirection = a.getInt(attr, -1); 3480 if (textDirection != -1) { 3481 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3482 } 3483 break; 3484 case R.styleable.View_textAlignment: 3485 // Clear any text alignment flag already set 3486 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3487 // Set the text alignment flag depending on the value of the attribute 3488 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3489 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3490 break; 3491 case R.styleable.View_importantForAccessibility: 3492 setImportantForAccessibility(a.getInt(attr, 3493 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3494 } 3495 } 3496 3497 a.recycle(); 3498 3499 setOverScrollMode(overScrollMode); 3500 3501 if (background != null) { 3502 setBackground(background); 3503 } 3504 3505 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3506 // layout direction). Those cached values will be used later during padding resolution. 3507 mUserPaddingStart = startPadding; 3508 mUserPaddingEnd = endPadding; 3509 3510 updateUserPaddingRelative(); 3511 3512 if (padding >= 0) { 3513 leftPadding = padding; 3514 topPadding = padding; 3515 rightPadding = padding; 3516 bottomPadding = padding; 3517 } 3518 3519 // If the user specified the padding (either with android:padding or 3520 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3521 // use the default padding or the padding from the background drawable 3522 // (stored at this point in mPadding*) 3523 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3524 topPadding >= 0 ? topPadding : mPaddingTop, 3525 rightPadding >= 0 ? rightPadding : mPaddingRight, 3526 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3527 3528 if (viewFlagMasks != 0) { 3529 setFlags(viewFlagValues, viewFlagMasks); 3530 } 3531 3532 // Needs to be called after mViewFlags is set 3533 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3534 recomputePadding(); 3535 } 3536 3537 if (x != 0 || y != 0) { 3538 scrollTo(x, y); 3539 } 3540 3541 if (transformSet) { 3542 setTranslationX(tx); 3543 setTranslationY(ty); 3544 setRotation(rotation); 3545 setRotationX(rotationX); 3546 setRotationY(rotationY); 3547 setScaleX(sx); 3548 setScaleY(sy); 3549 } 3550 3551 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3552 setScrollContainer(true); 3553 } 3554 3555 computeOpaqueFlags(); 3556 } 3557 3558 private void updateUserPaddingRelative() { 3559 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3560 } 3561 3562 /** 3563 * Non-public constructor for use in testing 3564 */ 3565 View() { 3566 mResources = null; 3567 } 3568 3569 /** 3570 * <p> 3571 * Initializes the fading edges from a given set of styled attributes. This 3572 * method should be called by subclasses that need fading edges and when an 3573 * instance of these subclasses is created programmatically rather than 3574 * being inflated from XML. This method is automatically called when the XML 3575 * is inflated. 3576 * </p> 3577 * 3578 * @param a the styled attributes set to initialize the fading edges from 3579 */ 3580 protected void initializeFadingEdge(TypedArray a) { 3581 initScrollCache(); 3582 3583 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3584 R.styleable.View_fadingEdgeLength, 3585 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3586 } 3587 3588 /** 3589 * Returns the size of the vertical faded edges used to indicate that more 3590 * content in this view is visible. 3591 * 3592 * @return The size in pixels of the vertical faded edge or 0 if vertical 3593 * faded edges are not enabled for this view. 3594 * @attr ref android.R.styleable#View_fadingEdgeLength 3595 */ 3596 public int getVerticalFadingEdgeLength() { 3597 if (isVerticalFadingEdgeEnabled()) { 3598 ScrollabilityCache cache = mScrollCache; 3599 if (cache != null) { 3600 return cache.fadingEdgeLength; 3601 } 3602 } 3603 return 0; 3604 } 3605 3606 /** 3607 * Set the size of the faded edge used to indicate that more content in this 3608 * view is available. Will not change whether the fading edge is enabled; use 3609 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3610 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3611 * for the vertical or horizontal fading edges. 3612 * 3613 * @param length The size in pixels of the faded edge used to indicate that more 3614 * content in this view is visible. 3615 */ 3616 public void setFadingEdgeLength(int length) { 3617 initScrollCache(); 3618 mScrollCache.fadingEdgeLength = length; 3619 } 3620 3621 /** 3622 * Returns the size of the horizontal faded edges used to indicate that more 3623 * content in this view is visible. 3624 * 3625 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3626 * faded edges are not enabled for this view. 3627 * @attr ref android.R.styleable#View_fadingEdgeLength 3628 */ 3629 public int getHorizontalFadingEdgeLength() { 3630 if (isHorizontalFadingEdgeEnabled()) { 3631 ScrollabilityCache cache = mScrollCache; 3632 if (cache != null) { 3633 return cache.fadingEdgeLength; 3634 } 3635 } 3636 return 0; 3637 } 3638 3639 /** 3640 * Returns the width of the vertical scrollbar. 3641 * 3642 * @return The width in pixels of the vertical scrollbar or 0 if there 3643 * is no vertical scrollbar. 3644 */ 3645 public int getVerticalScrollbarWidth() { 3646 ScrollabilityCache cache = mScrollCache; 3647 if (cache != null) { 3648 ScrollBarDrawable scrollBar = cache.scrollBar; 3649 if (scrollBar != null) { 3650 int size = scrollBar.getSize(true); 3651 if (size <= 0) { 3652 size = cache.scrollBarSize; 3653 } 3654 return size; 3655 } 3656 return 0; 3657 } 3658 return 0; 3659 } 3660 3661 /** 3662 * Returns the height of the horizontal scrollbar. 3663 * 3664 * @return The height in pixels of the horizontal scrollbar or 0 if 3665 * there is no horizontal scrollbar. 3666 */ 3667 protected int getHorizontalScrollbarHeight() { 3668 ScrollabilityCache cache = mScrollCache; 3669 if (cache != null) { 3670 ScrollBarDrawable scrollBar = cache.scrollBar; 3671 if (scrollBar != null) { 3672 int size = scrollBar.getSize(false); 3673 if (size <= 0) { 3674 size = cache.scrollBarSize; 3675 } 3676 return size; 3677 } 3678 return 0; 3679 } 3680 return 0; 3681 } 3682 3683 /** 3684 * <p> 3685 * Initializes the scrollbars from a given set of styled attributes. This 3686 * method should be called by subclasses that need scrollbars and when an 3687 * instance of these subclasses is created programmatically rather than 3688 * being inflated from XML. This method is automatically called when the XML 3689 * is inflated. 3690 * </p> 3691 * 3692 * @param a the styled attributes set to initialize the scrollbars from 3693 */ 3694 protected void initializeScrollbars(TypedArray a) { 3695 initScrollCache(); 3696 3697 final ScrollabilityCache scrollabilityCache = mScrollCache; 3698 3699 if (scrollabilityCache.scrollBar == null) { 3700 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3701 } 3702 3703 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3704 3705 if (!fadeScrollbars) { 3706 scrollabilityCache.state = ScrollabilityCache.ON; 3707 } 3708 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3709 3710 3711 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3712 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3713 .getScrollBarFadeDuration()); 3714 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3715 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3716 ViewConfiguration.getScrollDefaultDelay()); 3717 3718 3719 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3720 com.android.internal.R.styleable.View_scrollbarSize, 3721 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3722 3723 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3724 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3725 3726 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3727 if (thumb != null) { 3728 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3729 } 3730 3731 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3732 false); 3733 if (alwaysDraw) { 3734 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3735 } 3736 3737 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3738 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3739 3740 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3741 if (thumb != null) { 3742 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3743 } 3744 3745 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3746 false); 3747 if (alwaysDraw) { 3748 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3749 } 3750 3751 // Re-apply user/background padding so that scrollbar(s) get added 3752 resolvePadding(); 3753 } 3754 3755 /** 3756 * <p> 3757 * Initalizes the scrollability cache if necessary. 3758 * </p> 3759 */ 3760 private void initScrollCache() { 3761 if (mScrollCache == null) { 3762 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3763 } 3764 } 3765 3766 private ScrollabilityCache getScrollCache() { 3767 initScrollCache(); 3768 return mScrollCache; 3769 } 3770 3771 /** 3772 * Set the position of the vertical scroll bar. Should be one of 3773 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3774 * {@link #SCROLLBAR_POSITION_RIGHT}. 3775 * 3776 * @param position Where the vertical scroll bar should be positioned. 3777 */ 3778 public void setVerticalScrollbarPosition(int position) { 3779 if (mVerticalScrollbarPosition != position) { 3780 mVerticalScrollbarPosition = position; 3781 computeOpaqueFlags(); 3782 resolvePadding(); 3783 } 3784 } 3785 3786 /** 3787 * @return The position where the vertical scroll bar will show, if applicable. 3788 * @see #setVerticalScrollbarPosition(int) 3789 */ 3790 public int getVerticalScrollbarPosition() { 3791 return mVerticalScrollbarPosition; 3792 } 3793 3794 ListenerInfo getListenerInfo() { 3795 if (mListenerInfo != null) { 3796 return mListenerInfo; 3797 } 3798 mListenerInfo = new ListenerInfo(); 3799 return mListenerInfo; 3800 } 3801 3802 /** 3803 * Register a callback to be invoked when focus of this view changed. 3804 * 3805 * @param l The callback that will run. 3806 */ 3807 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3808 getListenerInfo().mOnFocusChangeListener = l; 3809 } 3810 3811 /** 3812 * Add a listener that will be called when the bounds of the view change due to 3813 * layout processing. 3814 * 3815 * @param listener The listener that will be called when layout bounds change. 3816 */ 3817 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3818 ListenerInfo li = getListenerInfo(); 3819 if (li.mOnLayoutChangeListeners == null) { 3820 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3821 } 3822 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3823 li.mOnLayoutChangeListeners.add(listener); 3824 } 3825 } 3826 3827 /** 3828 * Remove a listener for layout changes. 3829 * 3830 * @param listener The listener for layout bounds change. 3831 */ 3832 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3833 ListenerInfo li = mListenerInfo; 3834 if (li == null || li.mOnLayoutChangeListeners == null) { 3835 return; 3836 } 3837 li.mOnLayoutChangeListeners.remove(listener); 3838 } 3839 3840 /** 3841 * Add a listener for attach state changes. 3842 * 3843 * This listener will be called whenever this view is attached or detached 3844 * from a window. Remove the listener using 3845 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3846 * 3847 * @param listener Listener to attach 3848 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3849 */ 3850 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3851 ListenerInfo li = getListenerInfo(); 3852 if (li.mOnAttachStateChangeListeners == null) { 3853 li.mOnAttachStateChangeListeners 3854 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3855 } 3856 li.mOnAttachStateChangeListeners.add(listener); 3857 } 3858 3859 /** 3860 * Remove a listener for attach state changes. The listener will receive no further 3861 * notification of window attach/detach events. 3862 * 3863 * @param listener Listener to remove 3864 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3865 */ 3866 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3867 ListenerInfo li = mListenerInfo; 3868 if (li == null || li.mOnAttachStateChangeListeners == null) { 3869 return; 3870 } 3871 li.mOnAttachStateChangeListeners.remove(listener); 3872 } 3873 3874 /** 3875 * Returns the focus-change callback registered for this view. 3876 * 3877 * @return The callback, or null if one is not registered. 3878 */ 3879 public OnFocusChangeListener getOnFocusChangeListener() { 3880 ListenerInfo li = mListenerInfo; 3881 return li != null ? li.mOnFocusChangeListener : null; 3882 } 3883 3884 /** 3885 * Register a callback to be invoked when this view is clicked. If this view is not 3886 * clickable, it becomes clickable. 3887 * 3888 * @param l The callback that will run 3889 * 3890 * @see #setClickable(boolean) 3891 */ 3892 public void setOnClickListener(OnClickListener l) { 3893 if (!isClickable()) { 3894 setClickable(true); 3895 } 3896 getListenerInfo().mOnClickListener = l; 3897 } 3898 3899 /** 3900 * Return whether this view has an attached OnClickListener. Returns 3901 * true if there is a listener, false if there is none. 3902 */ 3903 public boolean hasOnClickListeners() { 3904 ListenerInfo li = mListenerInfo; 3905 return (li != null && li.mOnClickListener != null); 3906 } 3907 3908 /** 3909 * Register a callback to be invoked when this view is clicked and held. If this view is not 3910 * long clickable, it becomes long clickable. 3911 * 3912 * @param l The callback that will run 3913 * 3914 * @see #setLongClickable(boolean) 3915 */ 3916 public void setOnLongClickListener(OnLongClickListener l) { 3917 if (!isLongClickable()) { 3918 setLongClickable(true); 3919 } 3920 getListenerInfo().mOnLongClickListener = l; 3921 } 3922 3923 /** 3924 * Register a callback to be invoked when the context menu for this view is 3925 * being built. If this view is not long clickable, it becomes long clickable. 3926 * 3927 * @param l The callback that will run 3928 * 3929 */ 3930 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3931 if (!isLongClickable()) { 3932 setLongClickable(true); 3933 } 3934 getListenerInfo().mOnCreateContextMenuListener = l; 3935 } 3936 3937 /** 3938 * Call this view's OnClickListener, if it is defined. Performs all normal 3939 * actions associated with clicking: reporting accessibility event, playing 3940 * a sound, etc. 3941 * 3942 * @return True there was an assigned OnClickListener that was called, false 3943 * otherwise is returned. 3944 */ 3945 public boolean performClick() { 3946 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3947 3948 ListenerInfo li = mListenerInfo; 3949 if (li != null && li.mOnClickListener != null) { 3950 playSoundEffect(SoundEffectConstants.CLICK); 3951 li.mOnClickListener.onClick(this); 3952 return true; 3953 } 3954 3955 return false; 3956 } 3957 3958 /** 3959 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3960 * this only calls the listener, and does not do any associated clicking 3961 * actions like reporting an accessibility event. 3962 * 3963 * @return True there was an assigned OnClickListener that was called, false 3964 * otherwise is returned. 3965 */ 3966 public boolean callOnClick() { 3967 ListenerInfo li = mListenerInfo; 3968 if (li != null && li.mOnClickListener != null) { 3969 li.mOnClickListener.onClick(this); 3970 return true; 3971 } 3972 return false; 3973 } 3974 3975 /** 3976 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3977 * OnLongClickListener did not consume the event. 3978 * 3979 * @return True if one of the above receivers consumed the event, false otherwise. 3980 */ 3981 public boolean performLongClick() { 3982 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3983 3984 boolean handled = false; 3985 ListenerInfo li = mListenerInfo; 3986 if (li != null && li.mOnLongClickListener != null) { 3987 handled = li.mOnLongClickListener.onLongClick(View.this); 3988 } 3989 if (!handled) { 3990 handled = showContextMenu(); 3991 } 3992 if (handled) { 3993 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3994 } 3995 return handled; 3996 } 3997 3998 /** 3999 * Performs button-related actions during a touch down event. 4000 * 4001 * @param event The event. 4002 * @return True if the down was consumed. 4003 * 4004 * @hide 4005 */ 4006 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4007 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4008 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4009 return true; 4010 } 4011 } 4012 return false; 4013 } 4014 4015 /** 4016 * Bring up the context menu for this view. 4017 * 4018 * @return Whether a context menu was displayed. 4019 */ 4020 public boolean showContextMenu() { 4021 return getParent().showContextMenuForChild(this); 4022 } 4023 4024 /** 4025 * Bring up the context menu for this view, referring to the item under the specified point. 4026 * 4027 * @param x The referenced x coordinate. 4028 * @param y The referenced y coordinate. 4029 * @param metaState The keyboard modifiers that were pressed. 4030 * @return Whether a context menu was displayed. 4031 * 4032 * @hide 4033 */ 4034 public boolean showContextMenu(float x, float y, int metaState) { 4035 return showContextMenu(); 4036 } 4037 4038 /** 4039 * Start an action mode. 4040 * 4041 * @param callback Callback that will control the lifecycle of the action mode 4042 * @return The new action mode if it is started, null otherwise 4043 * 4044 * @see ActionMode 4045 */ 4046 public ActionMode startActionMode(ActionMode.Callback callback) { 4047 ViewParent parent = getParent(); 4048 if (parent == null) return null; 4049 return parent.startActionModeForChild(this, callback); 4050 } 4051 4052 /** 4053 * Register a callback to be invoked when a key is pressed in this view. 4054 * @param l the key listener to attach to this view 4055 */ 4056 public void setOnKeyListener(OnKeyListener l) { 4057 getListenerInfo().mOnKeyListener = l; 4058 } 4059 4060 /** 4061 * Register a callback to be invoked when a touch event is sent to this view. 4062 * @param l the touch listener to attach to this view 4063 */ 4064 public void setOnTouchListener(OnTouchListener l) { 4065 getListenerInfo().mOnTouchListener = l; 4066 } 4067 4068 /** 4069 * Register a callback to be invoked when a generic motion event is sent to this view. 4070 * @param l the generic motion listener to attach to this view 4071 */ 4072 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4073 getListenerInfo().mOnGenericMotionListener = l; 4074 } 4075 4076 /** 4077 * Register a callback to be invoked when a hover event is sent to this view. 4078 * @param l the hover listener to attach to this view 4079 */ 4080 public void setOnHoverListener(OnHoverListener l) { 4081 getListenerInfo().mOnHoverListener = l; 4082 } 4083 4084 /** 4085 * Register a drag event listener callback object for this View. The parameter is 4086 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4087 * View, the system calls the 4088 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4089 * @param l An implementation of {@link android.view.View.OnDragListener}. 4090 */ 4091 public void setOnDragListener(OnDragListener l) { 4092 getListenerInfo().mOnDragListener = l; 4093 } 4094 4095 /** 4096 * Give this view focus. This will cause 4097 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4098 * 4099 * Note: this does not check whether this {@link View} should get focus, it just 4100 * gives it focus no matter what. It should only be called internally by framework 4101 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4102 * 4103 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4104 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4105 * focus moved when requestFocus() is called. It may not always 4106 * apply, in which case use the default View.FOCUS_DOWN. 4107 * @param previouslyFocusedRect The rectangle of the view that had focus 4108 * prior in this View's coordinate system. 4109 */ 4110 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4111 if (DBG) { 4112 System.out.println(this + " requestFocus()"); 4113 } 4114 4115 if ((mPrivateFlags & FOCUSED) == 0) { 4116 mPrivateFlags |= FOCUSED; 4117 4118 if (mParent != null) { 4119 mParent.requestChildFocus(this, this); 4120 } 4121 4122 onFocusChanged(true, direction, previouslyFocusedRect); 4123 refreshDrawableState(); 4124 4125 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4126 notifyAccessibilityStateChanged(); 4127 } 4128 } 4129 } 4130 4131 /** 4132 * Request that a rectangle of this view be visible on the screen, 4133 * scrolling if necessary just enough. 4134 * 4135 * <p>A View should call this if it maintains some notion of which part 4136 * of its content is interesting. For example, a text editing view 4137 * should call this when its cursor moves. 4138 * 4139 * @param rectangle The rectangle. 4140 * @return Whether any parent scrolled. 4141 */ 4142 public boolean requestRectangleOnScreen(Rect rectangle) { 4143 return requestRectangleOnScreen(rectangle, false); 4144 } 4145 4146 /** 4147 * Request that a rectangle of this view be visible on the screen, 4148 * scrolling if necessary just enough. 4149 * 4150 * <p>A View should call this if it maintains some notion of which part 4151 * of its content is interesting. For example, a text editing view 4152 * should call this when its cursor moves. 4153 * 4154 * <p>When <code>immediate</code> is set to true, scrolling will not be 4155 * animated. 4156 * 4157 * @param rectangle The rectangle. 4158 * @param immediate True to forbid animated scrolling, false otherwise 4159 * @return Whether any parent scrolled. 4160 */ 4161 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4162 View child = this; 4163 ViewParent parent = mParent; 4164 boolean scrolled = false; 4165 while (parent != null) { 4166 scrolled |= parent.requestChildRectangleOnScreen(child, 4167 rectangle, immediate); 4168 4169 // offset rect so next call has the rectangle in the 4170 // coordinate system of its direct child. 4171 rectangle.offset(child.getLeft(), child.getTop()); 4172 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4173 4174 if (!(parent instanceof View)) { 4175 break; 4176 } 4177 4178 child = (View) parent; 4179 parent = child.getParent(); 4180 } 4181 return scrolled; 4182 } 4183 4184 /** 4185 * Called when this view wants to give up focus. If focus is cleared 4186 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4187 * <p> 4188 * <strong>Note:</strong> When a View clears focus the framework is trying 4189 * to give focus to the first focusable View from the top. Hence, if this 4190 * View is the first from the top that can take focus, then all callbacks 4191 * related to clearing focus will be invoked after wich the framework will 4192 * give focus to this view. 4193 * </p> 4194 */ 4195 public void clearFocus() { 4196 if (DBG) { 4197 System.out.println(this + " clearFocus()"); 4198 } 4199 4200 if ((mPrivateFlags & FOCUSED) != 0) { 4201 mPrivateFlags &= ~FOCUSED; 4202 4203 if (mParent != null) { 4204 mParent.clearChildFocus(this); 4205 } 4206 4207 onFocusChanged(false, 0, null); 4208 4209 refreshDrawableState(); 4210 4211 ensureInputFocusOnFirstFocusable(); 4212 4213 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4214 notifyAccessibilityStateChanged(); 4215 } 4216 } 4217 } 4218 4219 void ensureInputFocusOnFirstFocusable() { 4220 View root = getRootView(); 4221 if (root != null) { 4222 root.requestFocus(); 4223 } 4224 } 4225 4226 /** 4227 * Called internally by the view system when a new view is getting focus. 4228 * This is what clears the old focus. 4229 */ 4230 void unFocus() { 4231 if (DBG) { 4232 System.out.println(this + " unFocus()"); 4233 } 4234 4235 if ((mPrivateFlags & FOCUSED) != 0) { 4236 mPrivateFlags &= ~FOCUSED; 4237 4238 onFocusChanged(false, 0, null); 4239 refreshDrawableState(); 4240 4241 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4242 notifyAccessibilityStateChanged(); 4243 } 4244 } 4245 } 4246 4247 /** 4248 * Returns true if this view has focus iteself, or is the ancestor of the 4249 * view that has focus. 4250 * 4251 * @return True if this view has or contains focus, false otherwise. 4252 */ 4253 @ViewDebug.ExportedProperty(category = "focus") 4254 public boolean hasFocus() { 4255 return (mPrivateFlags & FOCUSED) != 0; 4256 } 4257 4258 /** 4259 * Returns true if this view is focusable or if it contains a reachable View 4260 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4261 * is a View whose parents do not block descendants focus. 4262 * 4263 * Only {@link #VISIBLE} views are considered focusable. 4264 * 4265 * @return True if the view is focusable or if the view contains a focusable 4266 * View, false otherwise. 4267 * 4268 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4269 */ 4270 public boolean hasFocusable() { 4271 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4272 } 4273 4274 /** 4275 * Called by the view system when the focus state of this view changes. 4276 * When the focus change event is caused by directional navigation, direction 4277 * and previouslyFocusedRect provide insight into where the focus is coming from. 4278 * When overriding, be sure to call up through to the super class so that 4279 * the standard focus handling will occur. 4280 * 4281 * @param gainFocus True if the View has focus; false otherwise. 4282 * @param direction The direction focus has moved when requestFocus() 4283 * is called to give this view focus. Values are 4284 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4285 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4286 * It may not always apply, in which case use the default. 4287 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4288 * system, of the previously focused view. If applicable, this will be 4289 * passed in as finer grained information about where the focus is coming 4290 * from (in addition to direction). Will be <code>null</code> otherwise. 4291 */ 4292 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4293 if (gainFocus) { 4294 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4295 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4296 requestAccessibilityFocus(); 4297 } 4298 } 4299 4300 InputMethodManager imm = InputMethodManager.peekInstance(); 4301 if (!gainFocus) { 4302 if (isPressed()) { 4303 setPressed(false); 4304 } 4305 if (imm != null && mAttachInfo != null 4306 && mAttachInfo.mHasWindowFocus) { 4307 imm.focusOut(this); 4308 } 4309 onFocusLost(); 4310 } else if (imm != null && mAttachInfo != null 4311 && mAttachInfo.mHasWindowFocus) { 4312 imm.focusIn(this); 4313 } 4314 4315 invalidate(true); 4316 ListenerInfo li = mListenerInfo; 4317 if (li != null && li.mOnFocusChangeListener != null) { 4318 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4319 } 4320 4321 if (mAttachInfo != null) { 4322 mAttachInfo.mKeyDispatchState.reset(this); 4323 } 4324 } 4325 4326 /** 4327 * Sends an accessibility event of the given type. If accessiiblity is 4328 * not enabled this method has no effect. The default implementation calls 4329 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4330 * to populate information about the event source (this View), then calls 4331 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4332 * populate the text content of the event source including its descendants, 4333 * and last calls 4334 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4335 * on its parent to resuest sending of the event to interested parties. 4336 * <p> 4337 * If an {@link AccessibilityDelegate} has been specified via calling 4338 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4339 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4340 * responsible for handling this call. 4341 * </p> 4342 * 4343 * @param eventType The type of the event to send, as defined by several types from 4344 * {@link android.view.accessibility.AccessibilityEvent}, such as 4345 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4346 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4347 * 4348 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4349 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4350 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4351 * @see AccessibilityDelegate 4352 */ 4353 public void sendAccessibilityEvent(int eventType) { 4354 if (mAccessibilityDelegate != null) { 4355 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4356 } else { 4357 sendAccessibilityEventInternal(eventType); 4358 } 4359 } 4360 4361 /** 4362 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4363 * {@link AccessibilityEvent} to make an announcement which is related to some 4364 * sort of a context change for which none of the events representing UI transitions 4365 * is a good fit. For example, announcing a new page in a book. If accessibility 4366 * is not enabled this method does nothing. 4367 * 4368 * @param text The announcement text. 4369 */ 4370 public void announceForAccessibility(CharSequence text) { 4371 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4372 AccessibilityEvent event = AccessibilityEvent.obtain( 4373 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4374 event.getText().add(text); 4375 sendAccessibilityEventUnchecked(event); 4376 } 4377 } 4378 4379 /** 4380 * @see #sendAccessibilityEvent(int) 4381 * 4382 * Note: Called from the default {@link AccessibilityDelegate}. 4383 */ 4384 void sendAccessibilityEventInternal(int eventType) { 4385 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4386 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4387 } 4388 } 4389 4390 /** 4391 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4392 * takes as an argument an empty {@link AccessibilityEvent} and does not 4393 * perform a check whether accessibility is enabled. 4394 * <p> 4395 * If an {@link AccessibilityDelegate} has been specified via calling 4396 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4397 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4398 * is responsible for handling this call. 4399 * </p> 4400 * 4401 * @param event The event to send. 4402 * 4403 * @see #sendAccessibilityEvent(int) 4404 */ 4405 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4406 if (mAccessibilityDelegate != null) { 4407 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4408 } else { 4409 sendAccessibilityEventUncheckedInternal(event); 4410 } 4411 } 4412 4413 /** 4414 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4415 * 4416 * Note: Called from the default {@link AccessibilityDelegate}. 4417 */ 4418 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4419 if (!isShown()) { 4420 return; 4421 } 4422 onInitializeAccessibilityEvent(event); 4423 // Only a subset of accessibility events populates text content. 4424 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4425 dispatchPopulateAccessibilityEvent(event); 4426 } 4427 // Intercept accessibility focus events fired by virtual nodes to keep 4428 // track of accessibility focus position in such nodes. 4429 final int eventType = event.getEventType(); 4430 switch (eventType) { 4431 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED: { 4432 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4433 event.getSourceNodeId()); 4434 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4435 ViewRootImpl viewRootImpl = getViewRootImpl(); 4436 if (viewRootImpl != null) { 4437 viewRootImpl.setAccessibilityFocusedHost(this); 4438 } 4439 } 4440 } break; 4441 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: { 4442 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4443 event.getSourceNodeId()); 4444 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4445 ViewRootImpl viewRootImpl = getViewRootImpl(); 4446 if (viewRootImpl != null) { 4447 viewRootImpl.setAccessibilityFocusedHost(null); 4448 } 4449 } 4450 } break; 4451 } 4452 // In the beginning we called #isShown(), so we know that getParent() is not null. 4453 getParent().requestSendAccessibilityEvent(this, event); 4454 } 4455 4456 /** 4457 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4458 * to its children for adding their text content to the event. Note that the 4459 * event text is populated in a separate dispatch path since we add to the 4460 * event not only the text of the source but also the text of all its descendants. 4461 * A typical implementation will call 4462 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4463 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4464 * on each child. Override this method if custom population of the event text 4465 * content is required. 4466 * <p> 4467 * If an {@link AccessibilityDelegate} has been specified via calling 4468 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4469 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4470 * is responsible for handling this call. 4471 * </p> 4472 * <p> 4473 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4474 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4475 * </p> 4476 * 4477 * @param event The event. 4478 * 4479 * @return True if the event population was completed. 4480 */ 4481 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4482 if (mAccessibilityDelegate != null) { 4483 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4484 } else { 4485 return dispatchPopulateAccessibilityEventInternal(event); 4486 } 4487 } 4488 4489 /** 4490 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4491 * 4492 * Note: Called from the default {@link AccessibilityDelegate}. 4493 */ 4494 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4495 onPopulateAccessibilityEvent(event); 4496 return false; 4497 } 4498 4499 /** 4500 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4501 * giving a chance to this View to populate the accessibility event with its 4502 * text content. While this method is free to modify event 4503 * attributes other than text content, doing so should normally be performed in 4504 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4505 * <p> 4506 * Example: Adding formatted date string to an accessibility event in addition 4507 * to the text added by the super implementation: 4508 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4509 * super.onPopulateAccessibilityEvent(event); 4510 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4511 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4512 * mCurrentDate.getTimeInMillis(), flags); 4513 * event.getText().add(selectedDateUtterance); 4514 * }</pre> 4515 * <p> 4516 * If an {@link AccessibilityDelegate} has been specified via calling 4517 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4518 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4519 * is responsible for handling this call. 4520 * </p> 4521 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4522 * information to the event, in case the default implementation has basic information to add. 4523 * </p> 4524 * 4525 * @param event The accessibility event which to populate. 4526 * 4527 * @see #sendAccessibilityEvent(int) 4528 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4529 */ 4530 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4531 if (mAccessibilityDelegate != null) { 4532 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4533 } else { 4534 onPopulateAccessibilityEventInternal(event); 4535 } 4536 } 4537 4538 /** 4539 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4540 * 4541 * Note: Called from the default {@link AccessibilityDelegate}. 4542 */ 4543 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4544 4545 } 4546 4547 /** 4548 * Initializes an {@link AccessibilityEvent} with information about 4549 * this View which is the event source. In other words, the source of 4550 * an accessibility event is the view whose state change triggered firing 4551 * the event. 4552 * <p> 4553 * Example: Setting the password property of an event in addition 4554 * to properties set by the super implementation: 4555 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4556 * super.onInitializeAccessibilityEvent(event); 4557 * event.setPassword(true); 4558 * }</pre> 4559 * <p> 4560 * If an {@link AccessibilityDelegate} has been specified via calling 4561 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4562 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4563 * is responsible for handling this call. 4564 * </p> 4565 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4566 * information to the event, in case the default implementation has basic information to add. 4567 * </p> 4568 * @param event The event to initialize. 4569 * 4570 * @see #sendAccessibilityEvent(int) 4571 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4572 */ 4573 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4574 if (mAccessibilityDelegate != null) { 4575 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4576 } else { 4577 onInitializeAccessibilityEventInternal(event); 4578 } 4579 } 4580 4581 /** 4582 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4583 * 4584 * Note: Called from the default {@link AccessibilityDelegate}. 4585 */ 4586 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4587 event.setSource(this); 4588 event.setClassName(View.class.getName()); 4589 event.setPackageName(getContext().getPackageName()); 4590 event.setEnabled(isEnabled()); 4591 event.setContentDescription(mContentDescription); 4592 4593 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4594 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4595 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4596 FOCUSABLES_ALL); 4597 event.setItemCount(focusablesTempList.size()); 4598 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4599 focusablesTempList.clear(); 4600 } 4601 } 4602 4603 /** 4604 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4605 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4606 * This method is responsible for obtaining an accessibility node info from a 4607 * pool of reusable instances and calling 4608 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4609 * initialize the former. 4610 * <p> 4611 * Note: The client is responsible for recycling the obtained instance by calling 4612 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4613 * </p> 4614 * 4615 * @return A populated {@link AccessibilityNodeInfo}. 4616 * 4617 * @see AccessibilityNodeInfo 4618 */ 4619 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4620 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4621 if (provider != null) { 4622 return provider.createAccessibilityNodeInfo(View.NO_ID); 4623 } else { 4624 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4625 onInitializeAccessibilityNodeInfo(info); 4626 return info; 4627 } 4628 } 4629 4630 /** 4631 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4632 * The base implementation sets: 4633 * <ul> 4634 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4635 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4636 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4637 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4638 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4639 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4640 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4641 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4642 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4643 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4644 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4645 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4646 * </ul> 4647 * <p> 4648 * Subclasses should override this method, call the super implementation, 4649 * and set additional attributes. 4650 * </p> 4651 * <p> 4652 * If an {@link AccessibilityDelegate} has been specified via calling 4653 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4654 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4655 * is responsible for handling this call. 4656 * </p> 4657 * 4658 * @param info The instance to initialize. 4659 */ 4660 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4661 if (mAccessibilityDelegate != null) { 4662 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4663 } else { 4664 onInitializeAccessibilityNodeInfoInternal(info); 4665 } 4666 } 4667 4668 /** 4669 * Gets the location of this view in screen coordintates. 4670 * 4671 * @param outRect The output location 4672 */ 4673 private void getBoundsOnScreen(Rect outRect) { 4674 if (mAttachInfo == null) { 4675 return; 4676 } 4677 4678 RectF position = mAttachInfo.mTmpTransformRect; 4679 position.setEmpty(); 4680 4681 if (!hasIdentityMatrix()) { 4682 getMatrix().mapRect(position); 4683 } 4684 4685 position.offset(mLeft, mRight); 4686 4687 ViewParent parent = mParent; 4688 while (parent instanceof View) { 4689 View parentView = (View) parent; 4690 4691 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4692 4693 if (!parentView.hasIdentityMatrix()) { 4694 parentView.getMatrix().mapRect(position); 4695 } 4696 4697 position.offset(parentView.mLeft, parentView.mTop); 4698 4699 parent = parentView.mParent; 4700 } 4701 4702 if (parent instanceof ViewRootImpl) { 4703 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 4704 position.offset(0, -viewRootImpl.mCurScrollY); 4705 } 4706 4707 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4708 4709 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 4710 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 4711 } 4712 4713 /** 4714 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4715 * 4716 * Note: Called from the default {@link AccessibilityDelegate}. 4717 */ 4718 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4719 Rect bounds = mAttachInfo.mTmpInvalRect; 4720 getDrawingRect(bounds); 4721 info.setBoundsInParent(bounds); 4722 4723 getBoundsOnScreen(bounds); 4724 info.setBoundsInScreen(bounds); 4725 4726 if ((mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 4727 ViewParent parent = getParentForAccessibility(); 4728 if (parent instanceof View) { 4729 info.setParent((View) parent); 4730 } 4731 } 4732 4733 info.setVisibleToUser(isVisibleToUser()); 4734 4735 info.setPackageName(mContext.getPackageName()); 4736 info.setClassName(View.class.getName()); 4737 info.setContentDescription(getContentDescription()); 4738 4739 info.setEnabled(isEnabled()); 4740 info.setClickable(isClickable()); 4741 info.setFocusable(isFocusable()); 4742 info.setFocused(isFocused()); 4743 info.setAccessibilityFocused(isAccessibilityFocused()); 4744 info.setSelected(isSelected()); 4745 info.setLongClickable(isLongClickable()); 4746 4747 // TODO: These make sense only if we are in an AdapterView but all 4748 // views can be selected. Maybe from accessiiblity perspective 4749 // we should report as selectable view in an AdapterView. 4750 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4751 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4752 4753 if (isFocusable()) { 4754 if (isFocused()) { 4755 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4756 } else { 4757 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4758 } 4759 } 4760 4761 if (!isAccessibilityFocused()) { 4762 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4763 } else { 4764 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4765 } 4766 4767 if (isClickable()) { 4768 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4769 } 4770 4771 if (isLongClickable()) { 4772 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4773 } 4774 4775 if (mContentDescription != null && mContentDescription.length() > 0) { 4776 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 4777 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 4778 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 4779 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 4780 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 4781 } 4782 } 4783 4784 /** 4785 * Computes whether this view is visible to the user. Such a view is 4786 * attached, visible, all its predecessors are visible, it is not clipped 4787 * entirely by its predecessors, and has an alpha greater than zero. 4788 * 4789 * @return Whether the view is visible on the screen. 4790 */ 4791 private boolean isVisibleToUser() { 4792 // The first two checks are made also made by isShown() which 4793 // however traverses the tree up to the parent to catch that. 4794 // Therefore, we do some fail fast check to minimize the up 4795 // tree traversal. 4796 return (mAttachInfo != null 4797 && mAttachInfo.mWindowVisibility == View.VISIBLE 4798 && getAlpha() > 0 4799 && isShown() 4800 && getGlobalVisibleRect(mAttachInfo.mTmpInvalRect)); 4801 } 4802 4803 /** 4804 * Sets a delegate for implementing accessibility support via compositon as 4805 * opposed to inheritance. The delegate's primary use is for implementing 4806 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4807 * 4808 * @param delegate The delegate instance. 4809 * 4810 * @see AccessibilityDelegate 4811 */ 4812 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4813 mAccessibilityDelegate = delegate; 4814 } 4815 4816 /** 4817 * Gets the provider for managing a virtual view hierarchy rooted at this View 4818 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4819 * that explore the window content. 4820 * <p> 4821 * If this method returns an instance, this instance is responsible for managing 4822 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4823 * View including the one representing the View itself. Similarly the returned 4824 * instance is responsible for performing accessibility actions on any virtual 4825 * view or the root view itself. 4826 * </p> 4827 * <p> 4828 * If an {@link AccessibilityDelegate} has been specified via calling 4829 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4830 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4831 * is responsible for handling this call. 4832 * </p> 4833 * 4834 * @return The provider. 4835 * 4836 * @see AccessibilityNodeProvider 4837 */ 4838 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4839 if (mAccessibilityDelegate != null) { 4840 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4841 } else { 4842 return null; 4843 } 4844 } 4845 4846 /** 4847 * Gets the unique identifier of this view on the screen for accessibility purposes. 4848 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4849 * 4850 * @return The view accessibility id. 4851 * 4852 * @hide 4853 */ 4854 public int getAccessibilityViewId() { 4855 if (mAccessibilityViewId == NO_ID) { 4856 mAccessibilityViewId = sNextAccessibilityViewId++; 4857 } 4858 return mAccessibilityViewId; 4859 } 4860 4861 /** 4862 * Gets the unique identifier of the window in which this View reseides. 4863 * 4864 * @return The window accessibility id. 4865 * 4866 * @hide 4867 */ 4868 public int getAccessibilityWindowId() { 4869 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4870 } 4871 4872 /** 4873 * Gets the {@link View} description. It briefly describes the view and is 4874 * primarily used for accessibility support. Set this property to enable 4875 * better accessibility support for your application. This is especially 4876 * true for views that do not have textual representation (For example, 4877 * ImageButton). 4878 * 4879 * @return The content description. 4880 * 4881 * @attr ref android.R.styleable#View_contentDescription 4882 */ 4883 @ViewDebug.ExportedProperty(category = "accessibility") 4884 public CharSequence getContentDescription() { 4885 return mContentDescription; 4886 } 4887 4888 /** 4889 * Sets the {@link View} description. It briefly describes the view and is 4890 * primarily used for accessibility support. Set this property to enable 4891 * better accessibility support for your application. This is especially 4892 * true for views that do not have textual representation (For example, 4893 * ImageButton). 4894 * 4895 * @param contentDescription The content description. 4896 * 4897 * @attr ref android.R.styleable#View_contentDescription 4898 */ 4899 @RemotableViewMethod 4900 public void setContentDescription(CharSequence contentDescription) { 4901 mContentDescription = contentDescription; 4902 } 4903 4904 /** 4905 * Invoked whenever this view loses focus, either by losing window focus or by losing 4906 * focus within its window. This method can be used to clear any state tied to the 4907 * focus. For instance, if a button is held pressed with the trackball and the window 4908 * loses focus, this method can be used to cancel the press. 4909 * 4910 * Subclasses of View overriding this method should always call super.onFocusLost(). 4911 * 4912 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4913 * @see #onWindowFocusChanged(boolean) 4914 * 4915 * @hide pending API council approval 4916 */ 4917 protected void onFocusLost() { 4918 resetPressedState(); 4919 } 4920 4921 private void resetPressedState() { 4922 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4923 return; 4924 } 4925 4926 if (isPressed()) { 4927 setPressed(false); 4928 4929 if (!mHasPerformedLongPress) { 4930 removeLongPressCallback(); 4931 } 4932 } 4933 } 4934 4935 /** 4936 * Returns true if this view has focus 4937 * 4938 * @return True if this view has focus, false otherwise. 4939 */ 4940 @ViewDebug.ExportedProperty(category = "focus") 4941 public boolean isFocused() { 4942 return (mPrivateFlags & FOCUSED) != 0; 4943 } 4944 4945 /** 4946 * Find the view in the hierarchy rooted at this view that currently has 4947 * focus. 4948 * 4949 * @return The view that currently has focus, or null if no focused view can 4950 * be found. 4951 */ 4952 public View findFocus() { 4953 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4954 } 4955 4956 /** 4957 * Indicates whether this view is one of the set of scrollable containers in 4958 * its window. 4959 * 4960 * @return whether this view is one of the set of scrollable containers in 4961 * its window 4962 * 4963 * @attr ref android.R.styleable#View_isScrollContainer 4964 */ 4965 public boolean isScrollContainer() { 4966 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 4967 } 4968 4969 /** 4970 * Change whether this view is one of the set of scrollable containers in 4971 * its window. This will be used to determine whether the window can 4972 * resize or must pan when a soft input area is open -- scrollable 4973 * containers allow the window to use resize mode since the container 4974 * will appropriately shrink. 4975 * 4976 * @attr ref android.R.styleable#View_isScrollContainer 4977 */ 4978 public void setScrollContainer(boolean isScrollContainer) { 4979 if (isScrollContainer) { 4980 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4981 mAttachInfo.mScrollContainers.add(this); 4982 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4983 } 4984 mPrivateFlags |= SCROLL_CONTAINER; 4985 } else { 4986 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4987 mAttachInfo.mScrollContainers.remove(this); 4988 } 4989 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4990 } 4991 } 4992 4993 /** 4994 * Returns the quality of the drawing cache. 4995 * 4996 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4997 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4998 * 4999 * @see #setDrawingCacheQuality(int) 5000 * @see #setDrawingCacheEnabled(boolean) 5001 * @see #isDrawingCacheEnabled() 5002 * 5003 * @attr ref android.R.styleable#View_drawingCacheQuality 5004 */ 5005 public int getDrawingCacheQuality() { 5006 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5007 } 5008 5009 /** 5010 * Set the drawing cache quality of this view. This value is used only when the 5011 * drawing cache is enabled 5012 * 5013 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5014 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5015 * 5016 * @see #getDrawingCacheQuality() 5017 * @see #setDrawingCacheEnabled(boolean) 5018 * @see #isDrawingCacheEnabled() 5019 * 5020 * @attr ref android.R.styleable#View_drawingCacheQuality 5021 */ 5022 public void setDrawingCacheQuality(int quality) { 5023 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5024 } 5025 5026 /** 5027 * Returns whether the screen should remain on, corresponding to the current 5028 * value of {@link #KEEP_SCREEN_ON}. 5029 * 5030 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5031 * 5032 * @see #setKeepScreenOn(boolean) 5033 * 5034 * @attr ref android.R.styleable#View_keepScreenOn 5035 */ 5036 public boolean getKeepScreenOn() { 5037 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5038 } 5039 5040 /** 5041 * Controls whether the screen should remain on, modifying the 5042 * value of {@link #KEEP_SCREEN_ON}. 5043 * 5044 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5045 * 5046 * @see #getKeepScreenOn() 5047 * 5048 * @attr ref android.R.styleable#View_keepScreenOn 5049 */ 5050 public void setKeepScreenOn(boolean keepScreenOn) { 5051 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5052 } 5053 5054 /** 5055 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5056 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5057 * 5058 * @attr ref android.R.styleable#View_nextFocusLeft 5059 */ 5060 public int getNextFocusLeftId() { 5061 return mNextFocusLeftId; 5062 } 5063 5064 /** 5065 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5066 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5067 * decide automatically. 5068 * 5069 * @attr ref android.R.styleable#View_nextFocusLeft 5070 */ 5071 public void setNextFocusLeftId(int nextFocusLeftId) { 5072 mNextFocusLeftId = nextFocusLeftId; 5073 } 5074 5075 /** 5076 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5077 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5078 * 5079 * @attr ref android.R.styleable#View_nextFocusRight 5080 */ 5081 public int getNextFocusRightId() { 5082 return mNextFocusRightId; 5083 } 5084 5085 /** 5086 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5087 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5088 * decide automatically. 5089 * 5090 * @attr ref android.R.styleable#View_nextFocusRight 5091 */ 5092 public void setNextFocusRightId(int nextFocusRightId) { 5093 mNextFocusRightId = nextFocusRightId; 5094 } 5095 5096 /** 5097 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5098 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5099 * 5100 * @attr ref android.R.styleable#View_nextFocusUp 5101 */ 5102 public int getNextFocusUpId() { 5103 return mNextFocusUpId; 5104 } 5105 5106 /** 5107 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5108 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5109 * decide automatically. 5110 * 5111 * @attr ref android.R.styleable#View_nextFocusUp 5112 */ 5113 public void setNextFocusUpId(int nextFocusUpId) { 5114 mNextFocusUpId = nextFocusUpId; 5115 } 5116 5117 /** 5118 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5119 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5120 * 5121 * @attr ref android.R.styleable#View_nextFocusDown 5122 */ 5123 public int getNextFocusDownId() { 5124 return mNextFocusDownId; 5125 } 5126 5127 /** 5128 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5129 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5130 * decide automatically. 5131 * 5132 * @attr ref android.R.styleable#View_nextFocusDown 5133 */ 5134 public void setNextFocusDownId(int nextFocusDownId) { 5135 mNextFocusDownId = nextFocusDownId; 5136 } 5137 5138 /** 5139 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5140 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5141 * 5142 * @attr ref android.R.styleable#View_nextFocusForward 5143 */ 5144 public int getNextFocusForwardId() { 5145 return mNextFocusForwardId; 5146 } 5147 5148 /** 5149 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5150 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5151 * decide automatically. 5152 * 5153 * @attr ref android.R.styleable#View_nextFocusForward 5154 */ 5155 public void setNextFocusForwardId(int nextFocusForwardId) { 5156 mNextFocusForwardId = nextFocusForwardId; 5157 } 5158 5159 /** 5160 * Returns the visibility of this view and all of its ancestors 5161 * 5162 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5163 */ 5164 public boolean isShown() { 5165 View current = this; 5166 //noinspection ConstantConditions 5167 do { 5168 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5169 return false; 5170 } 5171 ViewParent parent = current.mParent; 5172 if (parent == null) { 5173 return false; // We are not attached to the view root 5174 } 5175 if (!(parent instanceof View)) { 5176 return true; 5177 } 5178 current = (View) parent; 5179 } while (current != null); 5180 5181 return false; 5182 } 5183 5184 /** 5185 * Called by the view hierarchy when the content insets for a window have 5186 * changed, to allow it to adjust its content to fit within those windows. 5187 * The content insets tell you the space that the status bar, input method, 5188 * and other system windows infringe on the application's window. 5189 * 5190 * <p>You do not normally need to deal with this function, since the default 5191 * window decoration given to applications takes care of applying it to the 5192 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5193 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5194 * and your content can be placed under those system elements. You can then 5195 * use this method within your view hierarchy if you have parts of your UI 5196 * which you would like to ensure are not being covered. 5197 * 5198 * <p>The default implementation of this method simply applies the content 5199 * inset's to the view's padding. This can be enabled through 5200 * {@link #setFitsSystemWindows(boolean)}. Alternatively, you can override 5201 * the method and handle the insets however you would like. Note that the 5202 * insets provided by the framework are always relative to the far edges 5203 * of the window, not accounting for the location of the called view within 5204 * that window. (In fact when this method is called you do not yet know 5205 * where the layout will place the view, as it is done before layout happens.) 5206 * 5207 * <p>Note: unlike many View methods, there is no dispatch phase to this 5208 * call. If you are overriding it in a ViewGroup and want to allow the 5209 * call to continue to your children, you must be sure to call the super 5210 * implementation. 5211 * 5212 * @param insets Current content insets of the window. Prior to 5213 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5214 * the insets or else you and Android will be unhappy. 5215 * 5216 * @return Return true if this view applied the insets and it should not 5217 * continue propagating further down the hierarchy, false otherwise. 5218 */ 5219 protected boolean fitSystemWindows(Rect insets) { 5220 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5221 mUserPaddingStart = -1; 5222 mUserPaddingEnd = -1; 5223 mUserPaddingRelative = false; 5224 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5225 || mAttachInfo == null 5226 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5227 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5228 return true; 5229 } else { 5230 internalSetPadding(0, 0, 0, 0); 5231 return false; 5232 } 5233 } 5234 return false; 5235 } 5236 5237 /** 5238 * Set whether or not this view should account for system screen decorations 5239 * such as the status bar and inset its content. This allows this view to be 5240 * positioned in absolute screen coordinates and remain visible to the user. 5241 * 5242 * <p>This should only be used by top-level window decor views. 5243 * 5244 * @param fitSystemWindows true to inset content for system screen decorations, false for 5245 * default behavior. 5246 * 5247 * @attr ref android.R.styleable#View_fitsSystemWindows 5248 */ 5249 public void setFitsSystemWindows(boolean fitSystemWindows) { 5250 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5251 } 5252 5253 /** 5254 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 5255 * will account for system screen decorations such as the status bar and inset its 5256 * content. This allows the view to be positioned in absolute screen coordinates 5257 * and remain visible to the user. 5258 * 5259 * @return true if this view will adjust its content bounds for system screen decorations. 5260 * 5261 * @attr ref android.R.styleable#View_fitsSystemWindows 5262 */ 5263 public boolean fitsSystemWindows() { 5264 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5265 } 5266 5267 /** 5268 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5269 */ 5270 public void requestFitSystemWindows() { 5271 if (mParent != null) { 5272 mParent.requestFitSystemWindows(); 5273 } 5274 } 5275 5276 /** 5277 * For use by PhoneWindow to make its own system window fitting optional. 5278 * @hide 5279 */ 5280 public void makeOptionalFitsSystemWindows() { 5281 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5282 } 5283 5284 /** 5285 * Returns the visibility status for this view. 5286 * 5287 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5288 * @attr ref android.R.styleable#View_visibility 5289 */ 5290 @ViewDebug.ExportedProperty(mapping = { 5291 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5292 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5293 @ViewDebug.IntToString(from = GONE, to = "GONE") 5294 }) 5295 public int getVisibility() { 5296 return mViewFlags & VISIBILITY_MASK; 5297 } 5298 5299 /** 5300 * Set the enabled state of this view. 5301 * 5302 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5303 * @attr ref android.R.styleable#View_visibility 5304 */ 5305 @RemotableViewMethod 5306 public void setVisibility(int visibility) { 5307 setFlags(visibility, VISIBILITY_MASK); 5308 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5309 } 5310 5311 /** 5312 * Returns the enabled status for this view. The interpretation of the 5313 * enabled state varies by subclass. 5314 * 5315 * @return True if this view is enabled, false otherwise. 5316 */ 5317 @ViewDebug.ExportedProperty 5318 public boolean isEnabled() { 5319 return (mViewFlags & ENABLED_MASK) == ENABLED; 5320 } 5321 5322 /** 5323 * Set the enabled state of this view. The interpretation of the enabled 5324 * state varies by subclass. 5325 * 5326 * @param enabled True if this view is enabled, false otherwise. 5327 */ 5328 @RemotableViewMethod 5329 public void setEnabled(boolean enabled) { 5330 if (enabled == isEnabled()) return; 5331 5332 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5333 5334 /* 5335 * The View most likely has to change its appearance, so refresh 5336 * the drawable state. 5337 */ 5338 refreshDrawableState(); 5339 5340 // Invalidate too, since the default behavior for views is to be 5341 // be drawn at 50% alpha rather than to change the drawable. 5342 invalidate(true); 5343 } 5344 5345 /** 5346 * Set whether this view can receive the focus. 5347 * 5348 * Setting this to false will also ensure that this view is not focusable 5349 * in touch mode. 5350 * 5351 * @param focusable If true, this view can receive the focus. 5352 * 5353 * @see #setFocusableInTouchMode(boolean) 5354 * @attr ref android.R.styleable#View_focusable 5355 */ 5356 public void setFocusable(boolean focusable) { 5357 if (!focusable) { 5358 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5359 } 5360 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5361 } 5362 5363 /** 5364 * Set whether this view can receive focus while in touch mode. 5365 * 5366 * Setting this to true will also ensure that this view is focusable. 5367 * 5368 * @param focusableInTouchMode If true, this view can receive the focus while 5369 * in touch mode. 5370 * 5371 * @see #setFocusable(boolean) 5372 * @attr ref android.R.styleable#View_focusableInTouchMode 5373 */ 5374 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5375 // Focusable in touch mode should always be set before the focusable flag 5376 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5377 // which, in touch mode, will not successfully request focus on this view 5378 // because the focusable in touch mode flag is not set 5379 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5380 if (focusableInTouchMode) { 5381 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5382 } 5383 } 5384 5385 /** 5386 * Set whether this view should have sound effects enabled for events such as 5387 * clicking and touching. 5388 * 5389 * <p>You may wish to disable sound effects for a view if you already play sounds, 5390 * for instance, a dial key that plays dtmf tones. 5391 * 5392 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5393 * @see #isSoundEffectsEnabled() 5394 * @see #playSoundEffect(int) 5395 * @attr ref android.R.styleable#View_soundEffectsEnabled 5396 */ 5397 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5398 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5399 } 5400 5401 /** 5402 * @return whether this view should have sound effects enabled for events such as 5403 * clicking and touching. 5404 * 5405 * @see #setSoundEffectsEnabled(boolean) 5406 * @see #playSoundEffect(int) 5407 * @attr ref android.R.styleable#View_soundEffectsEnabled 5408 */ 5409 @ViewDebug.ExportedProperty 5410 public boolean isSoundEffectsEnabled() { 5411 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5412 } 5413 5414 /** 5415 * Set whether this view should have haptic feedback for events such as 5416 * long presses. 5417 * 5418 * <p>You may wish to disable haptic feedback if your view already controls 5419 * its own haptic feedback. 5420 * 5421 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5422 * @see #isHapticFeedbackEnabled() 5423 * @see #performHapticFeedback(int) 5424 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5425 */ 5426 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5427 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5428 } 5429 5430 /** 5431 * @return whether this view should have haptic feedback enabled for events 5432 * long presses. 5433 * 5434 * @see #setHapticFeedbackEnabled(boolean) 5435 * @see #performHapticFeedback(int) 5436 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5437 */ 5438 @ViewDebug.ExportedProperty 5439 public boolean isHapticFeedbackEnabled() { 5440 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5441 } 5442 5443 /** 5444 * Returns the layout direction for this view. 5445 * 5446 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5447 * {@link #LAYOUT_DIRECTION_RTL}, 5448 * {@link #LAYOUT_DIRECTION_INHERIT} or 5449 * {@link #LAYOUT_DIRECTION_LOCALE}. 5450 * 5451 * @attr ref android.R.styleable#View_layoutDirection 5452 * @hide 5453 */ 5454 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5455 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5456 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5457 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5458 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5459 }) 5460 public int getLayoutDirection() { 5461 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5462 } 5463 5464 /** 5465 * Set the layout direction for this view. This will propagate a reset of layout direction 5466 * resolution to the view's children and resolve layout direction for this view. 5467 * 5468 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5469 * {@link #LAYOUT_DIRECTION_RTL}, 5470 * {@link #LAYOUT_DIRECTION_INHERIT} or 5471 * {@link #LAYOUT_DIRECTION_LOCALE}. 5472 * 5473 * @attr ref android.R.styleable#View_layoutDirection 5474 * @hide 5475 */ 5476 @RemotableViewMethod 5477 public void setLayoutDirection(int layoutDirection) { 5478 if (getLayoutDirection() != layoutDirection) { 5479 // Reset the current layout direction and the resolved one 5480 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5481 resetResolvedLayoutDirection(); 5482 // Set the new layout direction (filtered) and ask for a layout pass 5483 mPrivateFlags2 |= 5484 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5485 requestLayout(); 5486 } 5487 } 5488 5489 /** 5490 * Returns the resolved layout direction for this view. 5491 * 5492 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5493 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5494 * @hide 5495 */ 5496 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5497 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5498 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5499 }) 5500 public int getResolvedLayoutDirection() { 5501 // The layout diretion will be resolved only if needed 5502 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5503 resolveLayoutDirection(); 5504 } 5505 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5506 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5507 } 5508 5509 /** 5510 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5511 * layout attribute and/or the inherited value from the parent 5512 * 5513 * @return true if the layout is right-to-left. 5514 * @hide 5515 */ 5516 @ViewDebug.ExportedProperty(category = "layout") 5517 public boolean isLayoutRtl() { 5518 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5519 } 5520 5521 /** 5522 * Indicates whether the view is currently tracking transient state that the 5523 * app should not need to concern itself with saving and restoring, but that 5524 * the framework should take special note to preserve when possible. 5525 * 5526 * <p>A view with transient state cannot be trivially rebound from an external 5527 * data source, such as an adapter binding item views in a list. This may be 5528 * because the view is performing an animation, tracking user selection 5529 * of content, or similar.</p> 5530 * 5531 * @return true if the view has transient state 5532 */ 5533 @ViewDebug.ExportedProperty(category = "layout") 5534 public boolean hasTransientState() { 5535 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5536 } 5537 5538 /** 5539 * Set whether this view is currently tracking transient state that the 5540 * framework should attempt to preserve when possible. This flag is reference counted, 5541 * so every call to setHasTransientState(true) should be paired with a later call 5542 * to setHasTransientState(false). 5543 * 5544 * <p>A view with transient state cannot be trivially rebound from an external 5545 * data source, such as an adapter binding item views in a list. This may be 5546 * because the view is performing an animation, tracking user selection 5547 * of content, or similar.</p> 5548 * 5549 * @param hasTransientState true if this view has transient state 5550 */ 5551 public void setHasTransientState(boolean hasTransientState) { 5552 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5553 mTransientStateCount - 1; 5554 if (mTransientStateCount < 0) { 5555 mTransientStateCount = 0; 5556 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5557 "unmatched pair of setHasTransientState calls"); 5558 } 5559 if ((hasTransientState && mTransientStateCount == 1) || 5560 (hasTransientState && mTransientStateCount == 0)) { 5561 // update flag if we've just incremented up from 0 or decremented down to 0 5562 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5563 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5564 if (mParent != null) { 5565 try { 5566 mParent.childHasTransientStateChanged(this, hasTransientState); 5567 } catch (AbstractMethodError e) { 5568 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5569 " does not fully implement ViewParent", e); 5570 } 5571 } 5572 } 5573 } 5574 5575 /** 5576 * If this view doesn't do any drawing on its own, set this flag to 5577 * allow further optimizations. By default, this flag is not set on 5578 * View, but could be set on some View subclasses such as ViewGroup. 5579 * 5580 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5581 * you should clear this flag. 5582 * 5583 * @param willNotDraw whether or not this View draw on its own 5584 */ 5585 public void setWillNotDraw(boolean willNotDraw) { 5586 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5587 } 5588 5589 /** 5590 * Returns whether or not this View draws on its own. 5591 * 5592 * @return true if this view has nothing to draw, false otherwise 5593 */ 5594 @ViewDebug.ExportedProperty(category = "drawing") 5595 public boolean willNotDraw() { 5596 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5597 } 5598 5599 /** 5600 * When a View's drawing cache is enabled, drawing is redirected to an 5601 * offscreen bitmap. Some views, like an ImageView, must be able to 5602 * bypass this mechanism if they already draw a single bitmap, to avoid 5603 * unnecessary usage of the memory. 5604 * 5605 * @param willNotCacheDrawing true if this view does not cache its 5606 * drawing, false otherwise 5607 */ 5608 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5609 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5610 } 5611 5612 /** 5613 * Returns whether or not this View can cache its drawing or not. 5614 * 5615 * @return true if this view does not cache its drawing, false otherwise 5616 */ 5617 @ViewDebug.ExportedProperty(category = "drawing") 5618 public boolean willNotCacheDrawing() { 5619 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5620 } 5621 5622 /** 5623 * Indicates whether this view reacts to click events or not. 5624 * 5625 * @return true if the view is clickable, false otherwise 5626 * 5627 * @see #setClickable(boolean) 5628 * @attr ref android.R.styleable#View_clickable 5629 */ 5630 @ViewDebug.ExportedProperty 5631 public boolean isClickable() { 5632 return (mViewFlags & CLICKABLE) == CLICKABLE; 5633 } 5634 5635 /** 5636 * Enables or disables click events for this view. When a view 5637 * is clickable it will change its state to "pressed" on every click. 5638 * Subclasses should set the view clickable to visually react to 5639 * user's clicks. 5640 * 5641 * @param clickable true to make the view clickable, false otherwise 5642 * 5643 * @see #isClickable() 5644 * @attr ref android.R.styleable#View_clickable 5645 */ 5646 public void setClickable(boolean clickable) { 5647 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5648 } 5649 5650 /** 5651 * Indicates whether this view reacts to long click events or not. 5652 * 5653 * @return true if the view is long clickable, false otherwise 5654 * 5655 * @see #setLongClickable(boolean) 5656 * @attr ref android.R.styleable#View_longClickable 5657 */ 5658 public boolean isLongClickable() { 5659 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5660 } 5661 5662 /** 5663 * Enables or disables long click events for this view. When a view is long 5664 * clickable it reacts to the user holding down the button for a longer 5665 * duration than a tap. This event can either launch the listener or a 5666 * context menu. 5667 * 5668 * @param longClickable true to make the view long clickable, false otherwise 5669 * @see #isLongClickable() 5670 * @attr ref android.R.styleable#View_longClickable 5671 */ 5672 public void setLongClickable(boolean longClickable) { 5673 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5674 } 5675 5676 /** 5677 * Sets the pressed state for this view. 5678 * 5679 * @see #isClickable() 5680 * @see #setClickable(boolean) 5681 * 5682 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5683 * the View's internal state from a previously set "pressed" state. 5684 */ 5685 public void setPressed(boolean pressed) { 5686 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5687 5688 if (pressed) { 5689 mPrivateFlags |= PRESSED; 5690 } else { 5691 mPrivateFlags &= ~PRESSED; 5692 } 5693 5694 if (needsRefresh) { 5695 refreshDrawableState(); 5696 } 5697 dispatchSetPressed(pressed); 5698 } 5699 5700 /** 5701 * Dispatch setPressed to all of this View's children. 5702 * 5703 * @see #setPressed(boolean) 5704 * 5705 * @param pressed The new pressed state 5706 */ 5707 protected void dispatchSetPressed(boolean pressed) { 5708 } 5709 5710 /** 5711 * Indicates whether the view is currently in pressed state. Unless 5712 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5713 * the pressed state. 5714 * 5715 * @see #setPressed(boolean) 5716 * @see #isClickable() 5717 * @see #setClickable(boolean) 5718 * 5719 * @return true if the view is currently pressed, false otherwise 5720 */ 5721 public boolean isPressed() { 5722 return (mPrivateFlags & PRESSED) == PRESSED; 5723 } 5724 5725 /** 5726 * Indicates whether this view will save its state (that is, 5727 * whether its {@link #onSaveInstanceState} method will be called). 5728 * 5729 * @return Returns true if the view state saving is enabled, else false. 5730 * 5731 * @see #setSaveEnabled(boolean) 5732 * @attr ref android.R.styleable#View_saveEnabled 5733 */ 5734 public boolean isSaveEnabled() { 5735 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5736 } 5737 5738 /** 5739 * Controls whether the saving of this view's state is 5740 * enabled (that is, whether its {@link #onSaveInstanceState} method 5741 * will be called). Note that even if freezing is enabled, the 5742 * view still must have an id assigned to it (via {@link #setId(int)}) 5743 * for its state to be saved. This flag can only disable the 5744 * saving of this view; any child views may still have their state saved. 5745 * 5746 * @param enabled Set to false to <em>disable</em> state saving, or true 5747 * (the default) to allow it. 5748 * 5749 * @see #isSaveEnabled() 5750 * @see #setId(int) 5751 * @see #onSaveInstanceState() 5752 * @attr ref android.R.styleable#View_saveEnabled 5753 */ 5754 public void setSaveEnabled(boolean enabled) { 5755 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5756 } 5757 5758 /** 5759 * Gets whether the framework should discard touches when the view's 5760 * window is obscured by another visible window. 5761 * Refer to the {@link View} security documentation for more details. 5762 * 5763 * @return True if touch filtering is enabled. 5764 * 5765 * @see #setFilterTouchesWhenObscured(boolean) 5766 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5767 */ 5768 @ViewDebug.ExportedProperty 5769 public boolean getFilterTouchesWhenObscured() { 5770 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5771 } 5772 5773 /** 5774 * Sets whether the framework should discard touches when the view's 5775 * window is obscured by another visible window. 5776 * Refer to the {@link View} security documentation for more details. 5777 * 5778 * @param enabled True if touch filtering should be enabled. 5779 * 5780 * @see #getFilterTouchesWhenObscured 5781 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5782 */ 5783 public void setFilterTouchesWhenObscured(boolean enabled) { 5784 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5785 FILTER_TOUCHES_WHEN_OBSCURED); 5786 } 5787 5788 /** 5789 * Indicates whether the entire hierarchy under this view will save its 5790 * state when a state saving traversal occurs from its parent. The default 5791 * is true; if false, these views will not be saved unless 5792 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5793 * 5794 * @return Returns true if the view state saving from parent is enabled, else false. 5795 * 5796 * @see #setSaveFromParentEnabled(boolean) 5797 */ 5798 public boolean isSaveFromParentEnabled() { 5799 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5800 } 5801 5802 /** 5803 * Controls whether the entire hierarchy under this view will save its 5804 * state when a state saving traversal occurs from its parent. The default 5805 * is true; if false, these views will not be saved unless 5806 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5807 * 5808 * @param enabled Set to false to <em>disable</em> state saving, or true 5809 * (the default) to allow it. 5810 * 5811 * @see #isSaveFromParentEnabled() 5812 * @see #setId(int) 5813 * @see #onSaveInstanceState() 5814 */ 5815 public void setSaveFromParentEnabled(boolean enabled) { 5816 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5817 } 5818 5819 5820 /** 5821 * Returns whether this View is able to take focus. 5822 * 5823 * @return True if this view can take focus, or false otherwise. 5824 * @attr ref android.R.styleable#View_focusable 5825 */ 5826 @ViewDebug.ExportedProperty(category = "focus") 5827 public final boolean isFocusable() { 5828 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5829 } 5830 5831 /** 5832 * When a view is focusable, it may not want to take focus when in touch mode. 5833 * For example, a button would like focus when the user is navigating via a D-pad 5834 * so that the user can click on it, but once the user starts touching the screen, 5835 * the button shouldn't take focus 5836 * @return Whether the view is focusable in touch mode. 5837 * @attr ref android.R.styleable#View_focusableInTouchMode 5838 */ 5839 @ViewDebug.ExportedProperty 5840 public final boolean isFocusableInTouchMode() { 5841 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5842 } 5843 5844 /** 5845 * Find the nearest view in the specified direction that can take focus. 5846 * This does not actually give focus to that view. 5847 * 5848 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5849 * 5850 * @return The nearest focusable in the specified direction, or null if none 5851 * can be found. 5852 */ 5853 public View focusSearch(int direction) { 5854 if (mParent != null) { 5855 return mParent.focusSearch(this, direction); 5856 } else { 5857 return null; 5858 } 5859 } 5860 5861 /** 5862 * This method is the last chance for the focused view and its ancestors to 5863 * respond to an arrow key. This is called when the focused view did not 5864 * consume the key internally, nor could the view system find a new view in 5865 * the requested direction to give focus to. 5866 * 5867 * @param focused The currently focused view. 5868 * @param direction The direction focus wants to move. One of FOCUS_UP, 5869 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5870 * @return True if the this view consumed this unhandled move. 5871 */ 5872 public boolean dispatchUnhandledMove(View focused, int direction) { 5873 return false; 5874 } 5875 5876 /** 5877 * If a user manually specified the next view id for a particular direction, 5878 * use the root to look up the view. 5879 * @param root The root view of the hierarchy containing this view. 5880 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5881 * or FOCUS_BACKWARD. 5882 * @return The user specified next view, or null if there is none. 5883 */ 5884 View findUserSetNextFocus(View root, int direction) { 5885 switch (direction) { 5886 case FOCUS_LEFT: 5887 if (mNextFocusLeftId == View.NO_ID) return null; 5888 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5889 case FOCUS_RIGHT: 5890 if (mNextFocusRightId == View.NO_ID) return null; 5891 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5892 case FOCUS_UP: 5893 if (mNextFocusUpId == View.NO_ID) return null; 5894 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5895 case FOCUS_DOWN: 5896 if (mNextFocusDownId == View.NO_ID) return null; 5897 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5898 case FOCUS_FORWARD: 5899 if (mNextFocusForwardId == View.NO_ID) return null; 5900 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5901 case FOCUS_BACKWARD: { 5902 if (mID == View.NO_ID) return null; 5903 final int id = mID; 5904 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5905 @Override 5906 public boolean apply(View t) { 5907 return t.mNextFocusForwardId == id; 5908 } 5909 }); 5910 } 5911 } 5912 return null; 5913 } 5914 5915 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5916 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5917 @Override 5918 public boolean apply(View t) { 5919 return t.mID == childViewId; 5920 } 5921 }); 5922 5923 if (result == null) { 5924 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5925 + "by user for id " + childViewId); 5926 } 5927 return result; 5928 } 5929 5930 /** 5931 * Find and return all focusable views that are descendants of this view, 5932 * possibly including this view if it is focusable itself. 5933 * 5934 * @param direction The direction of the focus 5935 * @return A list of focusable views 5936 */ 5937 public ArrayList<View> getFocusables(int direction) { 5938 ArrayList<View> result = new ArrayList<View>(24); 5939 addFocusables(result, direction); 5940 return result; 5941 } 5942 5943 /** 5944 * Add any focusable views that are descendants of this view (possibly 5945 * including this view if it is focusable itself) to views. If we are in touch mode, 5946 * only add views that are also focusable in touch mode. 5947 * 5948 * @param views Focusable views found so far 5949 * @param direction The direction of the focus 5950 */ 5951 public void addFocusables(ArrayList<View> views, int direction) { 5952 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 5953 } 5954 5955 /** 5956 * Adds any focusable views that are descendants of this view (possibly 5957 * including this view if it is focusable itself) to views. This method 5958 * adds all focusable views regardless if we are in touch mode or 5959 * only views focusable in touch mode if we are in touch mode or 5960 * only views that can take accessibility focus if accessibility is enabeld 5961 * depending on the focusable mode paramater. 5962 * 5963 * @param views Focusable views found so far or null if all we are interested is 5964 * the number of focusables. 5965 * @param direction The direction of the focus. 5966 * @param focusableMode The type of focusables to be added. 5967 * 5968 * @see #FOCUSABLES_ALL 5969 * @see #FOCUSABLES_TOUCH_MODE 5970 */ 5971 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 5972 if (views == null) { 5973 return; 5974 } 5975 if ((focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 5976 if (AccessibilityManager.getInstance(mContext).isEnabled() 5977 && includeForAccessibility()) { 5978 views.add(this); 5979 return; 5980 } 5981 } 5982 if (!isFocusable()) { 5983 return; 5984 } 5985 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 5986 && isInTouchMode() && !isFocusableInTouchMode()) { 5987 return; 5988 } 5989 views.add(this); 5990 } 5991 5992 /** 5993 * Finds the Views that contain given text. The containment is case insensitive. 5994 * The search is performed by either the text that the View renders or the content 5995 * description that describes the view for accessibility purposes and the view does 5996 * not render or both. Clients can specify how the search is to be performed via 5997 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 5998 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 5999 * 6000 * @param outViews The output list of matching Views. 6001 * @param searched The text to match against. 6002 * 6003 * @see #FIND_VIEWS_WITH_TEXT 6004 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6005 * @see #setContentDescription(CharSequence) 6006 */ 6007 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6008 if (getAccessibilityNodeProvider() != null) { 6009 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6010 outViews.add(this); 6011 } 6012 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6013 && (searched != null && searched.length() > 0) 6014 && (mContentDescription != null && mContentDescription.length() > 0)) { 6015 String searchedLowerCase = searched.toString().toLowerCase(); 6016 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6017 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6018 outViews.add(this); 6019 } 6020 } 6021 } 6022 6023 /** 6024 * Find and return all touchable views that are descendants of this view, 6025 * possibly including this view if it is touchable itself. 6026 * 6027 * @return A list of touchable views 6028 */ 6029 public ArrayList<View> getTouchables() { 6030 ArrayList<View> result = new ArrayList<View>(); 6031 addTouchables(result); 6032 return result; 6033 } 6034 6035 /** 6036 * Add any touchable views that are descendants of this view (possibly 6037 * including this view if it is touchable itself) to views. 6038 * 6039 * @param views Touchable views found so far 6040 */ 6041 public void addTouchables(ArrayList<View> views) { 6042 final int viewFlags = mViewFlags; 6043 6044 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6045 && (viewFlags & ENABLED_MASK) == ENABLED) { 6046 views.add(this); 6047 } 6048 } 6049 6050 /** 6051 * Returns whether this View is accessibility focused. 6052 * 6053 * @return True if this View is accessibility focused. 6054 */ 6055 boolean isAccessibilityFocused() { 6056 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 6057 } 6058 6059 /** 6060 * Call this to try to give accessibility focus to this view. 6061 * 6062 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6063 * returns false or the view is no visible or the view already has accessibility 6064 * focus. 6065 * 6066 * See also {@link #focusSearch(int)}, which is what you call to say that you 6067 * have focus, and you want your parent to look for the next one. 6068 * 6069 * @return Whether this view actually took accessibility focus. 6070 * 6071 * @hide 6072 */ 6073 public boolean requestAccessibilityFocus() { 6074 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6075 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6076 return false; 6077 } 6078 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6079 return false; 6080 } 6081 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6082 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6083 ViewRootImpl viewRootImpl = getViewRootImpl(); 6084 if (viewRootImpl != null) { 6085 viewRootImpl.setAccessibilityFocusedHost(this); 6086 } 6087 invalidate(); 6088 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6089 notifyAccessibilityStateChanged(); 6090 // Try to give input focus to this view - not a descendant. 6091 requestFocusNoSearch(View.FOCUS_DOWN, null); 6092 return true; 6093 } 6094 return false; 6095 } 6096 6097 /** 6098 * Call this to try to clear accessibility focus of this view. 6099 * 6100 * See also {@link #focusSearch(int)}, which is what you call to say that you 6101 * have focus, and you want your parent to look for the next one. 6102 * 6103 * @hide 6104 */ 6105 public void clearAccessibilityFocus() { 6106 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6107 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6108 ViewRootImpl viewRootImpl = getViewRootImpl(); 6109 if (viewRootImpl != null) { 6110 viewRootImpl.setAccessibilityFocusedHost(null); 6111 } 6112 invalidate(); 6113 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6114 notifyAccessibilityStateChanged(); 6115 6116 // Clear the text navigation state. 6117 setAccessibilityCursorPosition(-1); 6118 6119 // Try to move accessibility focus to the input focus. 6120 View rootView = getRootView(); 6121 if (rootView != null) { 6122 View inputFocus = rootView.findFocus(); 6123 if (inputFocus != null) { 6124 inputFocus.requestAccessibilityFocus(); 6125 } 6126 } 6127 } 6128 } 6129 6130 /** 6131 * Find the best view to take accessibility focus from a hover. 6132 * This function finds the deepest actionable view and if that 6133 * fails ask the parent to take accessibility focus from hover. 6134 * 6135 * @param x The X hovered location in this view coorditantes. 6136 * @param y The Y hovered location in this view coorditantes. 6137 * @return Whether the request was handled. 6138 * 6139 * @hide 6140 */ 6141 public boolean requestAccessibilityFocusFromHover(float x, float y) { 6142 if (onRequestAccessibilityFocusFromHover(x, y)) { 6143 return true; 6144 } 6145 ViewParent parent = mParent; 6146 if (parent instanceof View) { 6147 View parentView = (View) parent; 6148 6149 float[] position = mAttachInfo.mTmpTransformLocation; 6150 position[0] = x; 6151 position[1] = y; 6152 6153 // Compensate for the transformation of the current matrix. 6154 if (!hasIdentityMatrix()) { 6155 getMatrix().mapPoints(position); 6156 } 6157 6158 // Compensate for the parent scroll and the offset 6159 // of this view stop from the parent top. 6160 position[0] += mLeft - parentView.mScrollX; 6161 position[1] += mTop - parentView.mScrollY; 6162 6163 return parentView.requestAccessibilityFocusFromHover(position[0], position[1]); 6164 } 6165 return false; 6166 } 6167 6168 /** 6169 * Requests to give this View focus from hover. 6170 * 6171 * @param x The X hovered location in this view coorditantes. 6172 * @param y The Y hovered location in this view coorditantes. 6173 * @return Whether the request was handled. 6174 * 6175 * @hide 6176 */ 6177 public boolean onRequestAccessibilityFocusFromHover(float x, float y) { 6178 if (includeForAccessibility() 6179 && (isActionableForAccessibility() || hasListenersForAccessibility())) { 6180 return requestAccessibilityFocus(); 6181 } 6182 return false; 6183 } 6184 6185 /** 6186 * Clears accessibility focus without calling any callback methods 6187 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6188 * is used for clearing accessibility focus when giving this focus to 6189 * another view. 6190 */ 6191 void clearAccessibilityFocusNoCallbacks() { 6192 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6193 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6194 invalidate(); 6195 } 6196 } 6197 6198 /** 6199 * Call this to try to give focus to a specific view or to one of its 6200 * descendants. 6201 * 6202 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6203 * false), or if it is focusable and it is not focusable in touch mode 6204 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6205 * 6206 * See also {@link #focusSearch(int)}, which is what you call to say that you 6207 * have focus, and you want your parent to look for the next one. 6208 * 6209 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6210 * {@link #FOCUS_DOWN} and <code>null</code>. 6211 * 6212 * @return Whether this view or one of its descendants actually took focus. 6213 */ 6214 public final boolean requestFocus() { 6215 return requestFocus(View.FOCUS_DOWN); 6216 } 6217 6218 /** 6219 * Call this to try to give focus to a specific view or to one of its 6220 * descendants and give it a hint about what direction focus is heading. 6221 * 6222 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6223 * false), or if it is focusable and it is not focusable in touch mode 6224 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6225 * 6226 * See also {@link #focusSearch(int)}, which is what you call to say that you 6227 * have focus, and you want your parent to look for the next one. 6228 * 6229 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6230 * <code>null</code> set for the previously focused rectangle. 6231 * 6232 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6233 * @return Whether this view or one of its descendants actually took focus. 6234 */ 6235 public final boolean requestFocus(int direction) { 6236 return requestFocus(direction, null); 6237 } 6238 6239 /** 6240 * Call this to try to give focus to a specific view or to one of its descendants 6241 * and give it hints about the direction and a specific rectangle that the focus 6242 * is coming from. The rectangle can help give larger views a finer grained hint 6243 * about where focus is coming from, and therefore, where to show selection, or 6244 * forward focus change internally. 6245 * 6246 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6247 * false), or if it is focusable and it is not focusable in touch mode 6248 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6249 * 6250 * A View will not take focus if it is not visible. 6251 * 6252 * A View will not take focus if one of its parents has 6253 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6254 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6255 * 6256 * See also {@link #focusSearch(int)}, which is what you call to say that you 6257 * have focus, and you want your parent to look for the next one. 6258 * 6259 * You may wish to override this method if your custom {@link View} has an internal 6260 * {@link View} that it wishes to forward the request to. 6261 * 6262 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6263 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6264 * to give a finer grained hint about where focus is coming from. May be null 6265 * if there is no hint. 6266 * @return Whether this view or one of its descendants actually took focus. 6267 */ 6268 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6269 return requestFocusNoSearch(direction, previouslyFocusedRect); 6270 } 6271 6272 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6273 // need to be focusable 6274 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6275 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6276 return false; 6277 } 6278 6279 // need to be focusable in touch mode if in touch mode 6280 if (isInTouchMode() && 6281 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6282 return false; 6283 } 6284 6285 // need to not have any parents blocking us 6286 if (hasAncestorThatBlocksDescendantFocus()) { 6287 return false; 6288 } 6289 6290 handleFocusGainInternal(direction, previouslyFocusedRect); 6291 return true; 6292 } 6293 6294 /** 6295 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6296 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6297 * touch mode to request focus when they are touched. 6298 * 6299 * @return Whether this view or one of its descendants actually took focus. 6300 * 6301 * @see #isInTouchMode() 6302 * 6303 */ 6304 public final boolean requestFocusFromTouch() { 6305 // Leave touch mode if we need to 6306 if (isInTouchMode()) { 6307 ViewRootImpl viewRoot = getViewRootImpl(); 6308 if (viewRoot != null) { 6309 viewRoot.ensureTouchMode(false); 6310 } 6311 } 6312 return requestFocus(View.FOCUS_DOWN); 6313 } 6314 6315 /** 6316 * @return Whether any ancestor of this view blocks descendant focus. 6317 */ 6318 private boolean hasAncestorThatBlocksDescendantFocus() { 6319 ViewParent ancestor = mParent; 6320 while (ancestor instanceof ViewGroup) { 6321 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6322 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6323 return true; 6324 } else { 6325 ancestor = vgAncestor.getParent(); 6326 } 6327 } 6328 return false; 6329 } 6330 6331 /** 6332 * Gets the mode for determining whether this View is important for accessibility 6333 * which is if it fires accessibility events and if it is reported to 6334 * accessibility services that query the screen. 6335 * 6336 * @return The mode for determining whether a View is important for accessibility. 6337 * 6338 * @attr ref android.R.styleable#View_importantForAccessibility 6339 * 6340 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6341 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6342 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6343 */ 6344 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6345 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, 6346 to = "IMPORTANT_FOR_ACCESSIBILITY_AUTO"), 6347 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, 6348 to = "IMPORTANT_FOR_ACCESSIBILITY_YES"), 6349 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, 6350 to = "IMPORTANT_FOR_ACCESSIBILITY_NO") 6351 }) 6352 public int getImportantForAccessibility() { 6353 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6354 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6355 } 6356 6357 /** 6358 * Sets how to determine whether this view is important for accessibility 6359 * which is if it fires accessibility events and if it is reported to 6360 * accessibility services that query the screen. 6361 * 6362 * @param mode How to determine whether this view is important for accessibility. 6363 * 6364 * @attr ref android.R.styleable#View_importantForAccessibility 6365 * 6366 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6367 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6368 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6369 */ 6370 public void setImportantForAccessibility(int mode) { 6371 if (mode != getImportantForAccessibility()) { 6372 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6373 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6374 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6375 notifyAccessibilityStateChanged(); 6376 } 6377 } 6378 6379 /** 6380 * Gets whether this view should be exposed for accessibility. 6381 * 6382 * @return Whether the view is exposed for accessibility. 6383 * 6384 * @hide 6385 */ 6386 public boolean isImportantForAccessibility() { 6387 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6388 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6389 switch (mode) { 6390 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6391 return true; 6392 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6393 return false; 6394 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6395 return isActionableForAccessibility() || hasListenersForAccessibility(); 6396 default: 6397 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6398 + mode); 6399 } 6400 } 6401 6402 /** 6403 * Gets the parent for accessibility purposes. Note that the parent for 6404 * accessibility is not necessary the immediate parent. It is the first 6405 * predecessor that is important for accessibility. 6406 * 6407 * @return The parent for accessibility purposes. 6408 */ 6409 public ViewParent getParentForAccessibility() { 6410 if (mParent instanceof View) { 6411 View parentView = (View) mParent; 6412 if (parentView.includeForAccessibility()) { 6413 return mParent; 6414 } else { 6415 return mParent.getParentForAccessibility(); 6416 } 6417 } 6418 return null; 6419 } 6420 6421 /** 6422 * Adds the children of a given View for accessibility. Since some Views are 6423 * not important for accessibility the children for accessibility are not 6424 * necessarily direct children of the riew, rather they are the first level of 6425 * descendants important for accessibility. 6426 * 6427 * @param children The list of children for accessibility. 6428 */ 6429 public void addChildrenForAccessibility(ArrayList<View> children) { 6430 if (includeForAccessibility()) { 6431 children.add(this); 6432 } 6433 } 6434 6435 /** 6436 * Whether to regard this view for accessibility. A view is regarded for 6437 * accessibility if it is important for accessibility or the querying 6438 * accessibility service has explicitly requested that view not 6439 * important for accessibility are regarded. 6440 * 6441 * @return Whether to regard the view for accessibility. 6442 */ 6443 boolean includeForAccessibility() { 6444 if (mAttachInfo != null) { 6445 if (!mAttachInfo.mIncludeNotImportantViews) { 6446 return isImportantForAccessibility(); 6447 } else { 6448 return true; 6449 } 6450 } 6451 return false; 6452 } 6453 6454 /** 6455 * Returns whether the View is considered actionable from 6456 * accessibility perspective. Such view are important for 6457 * accessiiblity. 6458 * 6459 * @return True if the view is actionable for accessibility. 6460 */ 6461 private boolean isActionableForAccessibility() { 6462 return (isClickable() || isLongClickable() || isFocusable()); 6463 } 6464 6465 /** 6466 * Returns whether the View has registered callbacks wich makes it 6467 * important for accessiiblity. 6468 * 6469 * @return True if the view is actionable for accessibility. 6470 */ 6471 private boolean hasListenersForAccessibility() { 6472 ListenerInfo info = getListenerInfo(); 6473 return mTouchDelegate != null || info.mOnKeyListener != null 6474 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6475 || info.mOnHoverListener != null || info.mOnDragListener != null; 6476 } 6477 6478 /** 6479 * Notifies accessibility services that some view's important for 6480 * accessibility state has changed. Note that such notifications 6481 * are made at most once every 6482 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6483 * to avoid unnecessary load to the system. Also once a view has 6484 * made a notifucation this method is a NOP until the notification has 6485 * been sent to clients. 6486 * 6487 * @hide 6488 * 6489 * TODO: Makse sure this method is called for any view state change 6490 * that is interesting for accessilility purposes. 6491 */ 6492 public void notifyAccessibilityStateChanged() { 6493 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6494 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6495 if (mParent != null) { 6496 mParent.childAccessibilityStateChanged(this); 6497 } 6498 } 6499 } 6500 6501 /** 6502 * Reset the state indicating the this view has requested clients 6503 * interested in its accessiblity state to be notified. 6504 * 6505 * @hide 6506 */ 6507 public void resetAccessibilityStateChanged() { 6508 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6509 } 6510 6511 /** 6512 * Performs the specified accessibility action on the view. For 6513 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6514 * 6515 * @param action The action to perform. 6516 * @param arguments Optional action arguments. 6517 * @return Whether the action was performed. 6518 */ 6519 public boolean performAccessibilityAction(int action, Bundle arguments) { 6520 switch (action) { 6521 case AccessibilityNodeInfo.ACTION_CLICK: { 6522 if (isClickable()) { 6523 return performClick(); 6524 } 6525 } break; 6526 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6527 if (isLongClickable()) { 6528 return performLongClick(); 6529 } 6530 } break; 6531 case AccessibilityNodeInfo.ACTION_FOCUS: { 6532 if (!hasFocus()) { 6533 // Get out of touch mode since accessibility 6534 // wants to move focus around. 6535 getViewRootImpl().ensureTouchMode(false); 6536 return requestFocus(); 6537 } 6538 } break; 6539 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6540 if (hasFocus()) { 6541 clearFocus(); 6542 return !isFocused(); 6543 } 6544 } break; 6545 case AccessibilityNodeInfo.ACTION_SELECT: { 6546 if (!isSelected()) { 6547 setSelected(true); 6548 return isSelected(); 6549 } 6550 } break; 6551 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6552 if (isSelected()) { 6553 setSelected(false); 6554 return !isSelected(); 6555 } 6556 } break; 6557 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6558 if (!isAccessibilityFocused()) { 6559 return requestAccessibilityFocus(); 6560 } 6561 } break; 6562 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6563 if (isAccessibilityFocused()) { 6564 clearAccessibilityFocus(); 6565 return true; 6566 } 6567 } break; 6568 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6569 if (arguments != null) { 6570 final int granularity = arguments.getInt( 6571 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6572 return nextAtGranularity(granularity); 6573 } 6574 } break; 6575 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6576 if (arguments != null) { 6577 final int granularity = arguments.getInt( 6578 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6579 return previousAtGranularity(granularity); 6580 } 6581 } break; 6582 } 6583 return false; 6584 } 6585 6586 private boolean nextAtGranularity(int granularity) { 6587 CharSequence text = getIterableTextForAccessibility(); 6588 if (text != null && text.length() > 0) { 6589 return false; 6590 } 6591 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6592 if (iterator == null) { 6593 return false; 6594 } 6595 final int current = getAccessibilityCursorPosition(); 6596 final int[] range = iterator.following(current); 6597 if (range == null) { 6598 setAccessibilityCursorPosition(-1); 6599 return false; 6600 } 6601 final int start = range[0]; 6602 final int end = range[1]; 6603 setAccessibilityCursorPosition(start); 6604 sendViewTextTraversedAtGranularityEvent( 6605 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6606 granularity, start, end); 6607 return true; 6608 } 6609 6610 private boolean previousAtGranularity(int granularity) { 6611 CharSequence text = getIterableTextForAccessibility(); 6612 if (text != null && text.length() > 0) { 6613 return false; 6614 } 6615 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6616 if (iterator == null) { 6617 return false; 6618 } 6619 final int selectionStart = getAccessibilityCursorPosition(); 6620 final int current = selectionStart >= 0 ? selectionStart : text.length() + 1; 6621 final int[] range = iterator.preceding(current); 6622 if (range == null) { 6623 setAccessibilityCursorPosition(-1); 6624 return false; 6625 } 6626 final int start = range[0]; 6627 final int end = range[1]; 6628 setAccessibilityCursorPosition(end); 6629 sendViewTextTraversedAtGranularityEvent( 6630 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 6631 granularity, start, end); 6632 return true; 6633 } 6634 6635 /** 6636 * Gets the text reported for accessibility purposes. 6637 * 6638 * @return The accessibility text. 6639 * 6640 * @hide 6641 */ 6642 public CharSequence getIterableTextForAccessibility() { 6643 return mContentDescription; 6644 } 6645 6646 /** 6647 * @hide 6648 */ 6649 public int getAccessibilityCursorPosition() { 6650 return mAccessibilityCursorPosition; 6651 } 6652 6653 /** 6654 * @hide 6655 */ 6656 public void setAccessibilityCursorPosition(int position) { 6657 mAccessibilityCursorPosition = position; 6658 } 6659 6660 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 6661 int fromIndex, int toIndex) { 6662 if (mParent == null) { 6663 return; 6664 } 6665 AccessibilityEvent event = AccessibilityEvent.obtain( 6666 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 6667 onInitializeAccessibilityEvent(event); 6668 onPopulateAccessibilityEvent(event); 6669 event.setFromIndex(fromIndex); 6670 event.setToIndex(toIndex); 6671 event.setAction(action); 6672 event.setMovementGranularity(granularity); 6673 mParent.requestSendAccessibilityEvent(this, event); 6674 } 6675 6676 /** 6677 * @hide 6678 */ 6679 public TextSegmentIterator getIteratorForGranularity(int granularity) { 6680 switch (granularity) { 6681 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 6682 CharSequence text = getIterableTextForAccessibility(); 6683 if (text != null && text.length() > 0) { 6684 CharacterTextSegmentIterator iterator = 6685 CharacterTextSegmentIterator.getInstance(mContext); 6686 iterator.initialize(text.toString()); 6687 return iterator; 6688 } 6689 } break; 6690 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 6691 CharSequence text = getIterableTextForAccessibility(); 6692 if (text != null && text.length() > 0) { 6693 WordTextSegmentIterator iterator = 6694 WordTextSegmentIterator.getInstance(mContext); 6695 iterator.initialize(text.toString()); 6696 return iterator; 6697 } 6698 } break; 6699 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 6700 CharSequence text = getIterableTextForAccessibility(); 6701 if (text != null && text.length() > 0) { 6702 ParagraphTextSegmentIterator iterator = 6703 ParagraphTextSegmentIterator.getInstance(); 6704 iterator.initialize(text.toString()); 6705 return iterator; 6706 } 6707 } break; 6708 } 6709 return null; 6710 } 6711 6712 /** 6713 * @hide 6714 */ 6715 public void dispatchStartTemporaryDetach() { 6716 clearAccessibilityFocus(); 6717 onStartTemporaryDetach(); 6718 } 6719 6720 /** 6721 * This is called when a container is going to temporarily detach a child, with 6722 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6723 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6724 * {@link #onDetachedFromWindow()} when the container is done. 6725 */ 6726 public void onStartTemporaryDetach() { 6727 removeUnsetPressCallback(); 6728 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6729 } 6730 6731 /** 6732 * @hide 6733 */ 6734 public void dispatchFinishTemporaryDetach() { 6735 onFinishTemporaryDetach(); 6736 } 6737 6738 /** 6739 * Called after {@link #onStartTemporaryDetach} when the container is done 6740 * changing the view. 6741 */ 6742 public void onFinishTemporaryDetach() { 6743 } 6744 6745 /** 6746 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6747 * for this view's window. Returns null if the view is not currently attached 6748 * to the window. Normally you will not need to use this directly, but 6749 * just use the standard high-level event callbacks like 6750 * {@link #onKeyDown(int, KeyEvent)}. 6751 */ 6752 public KeyEvent.DispatcherState getKeyDispatcherState() { 6753 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6754 } 6755 6756 /** 6757 * Dispatch a key event before it is processed by any input method 6758 * associated with the view hierarchy. This can be used to intercept 6759 * key events in special situations before the IME consumes them; a 6760 * typical example would be handling the BACK key to update the application's 6761 * UI instead of allowing the IME to see it and close itself. 6762 * 6763 * @param event The key event to be dispatched. 6764 * @return True if the event was handled, false otherwise. 6765 */ 6766 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6767 return onKeyPreIme(event.getKeyCode(), event); 6768 } 6769 6770 /** 6771 * Dispatch a key event to the next view on the focus path. This path runs 6772 * from the top of the view tree down to the currently focused view. If this 6773 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6774 * the next node down the focus path. This method also fires any key 6775 * listeners. 6776 * 6777 * @param event The key event to be dispatched. 6778 * @return True if the event was handled, false otherwise. 6779 */ 6780 public boolean dispatchKeyEvent(KeyEvent event) { 6781 if (mInputEventConsistencyVerifier != null) { 6782 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6783 } 6784 6785 // Give any attached key listener a first crack at the event. 6786 //noinspection SimplifiableIfStatement 6787 ListenerInfo li = mListenerInfo; 6788 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6789 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6790 return true; 6791 } 6792 6793 if (event.dispatch(this, mAttachInfo != null 6794 ? mAttachInfo.mKeyDispatchState : null, this)) { 6795 return true; 6796 } 6797 6798 if (mInputEventConsistencyVerifier != null) { 6799 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6800 } 6801 return false; 6802 } 6803 6804 /** 6805 * Dispatches a key shortcut event. 6806 * 6807 * @param event The key event to be dispatched. 6808 * @return True if the event was handled by the view, false otherwise. 6809 */ 6810 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6811 return onKeyShortcut(event.getKeyCode(), event); 6812 } 6813 6814 /** 6815 * Pass the touch screen motion event down to the target view, or this 6816 * view if it is the target. 6817 * 6818 * @param event The motion event to be dispatched. 6819 * @return True if the event was handled by the view, false otherwise. 6820 */ 6821 public boolean dispatchTouchEvent(MotionEvent event) { 6822 if (mInputEventConsistencyVerifier != null) { 6823 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6824 } 6825 6826 if (onFilterTouchEventForSecurity(event)) { 6827 //noinspection SimplifiableIfStatement 6828 ListenerInfo li = mListenerInfo; 6829 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6830 && li.mOnTouchListener.onTouch(this, event)) { 6831 return true; 6832 } 6833 6834 if (onTouchEvent(event)) { 6835 return true; 6836 } 6837 } 6838 6839 if (mInputEventConsistencyVerifier != null) { 6840 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6841 } 6842 return false; 6843 } 6844 6845 /** 6846 * Filter the touch event to apply security policies. 6847 * 6848 * @param event The motion event to be filtered. 6849 * @return True if the event should be dispatched, false if the event should be dropped. 6850 * 6851 * @see #getFilterTouchesWhenObscured 6852 */ 6853 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6854 //noinspection RedundantIfStatement 6855 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6856 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6857 // Window is obscured, drop this touch. 6858 return false; 6859 } 6860 return true; 6861 } 6862 6863 /** 6864 * Pass a trackball motion event down to the focused view. 6865 * 6866 * @param event The motion event to be dispatched. 6867 * @return True if the event was handled by the view, false otherwise. 6868 */ 6869 public boolean dispatchTrackballEvent(MotionEvent event) { 6870 if (mInputEventConsistencyVerifier != null) { 6871 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6872 } 6873 6874 return onTrackballEvent(event); 6875 } 6876 6877 /** 6878 * Dispatch a generic motion event. 6879 * <p> 6880 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6881 * are delivered to the view under the pointer. All other generic motion events are 6882 * delivered to the focused view. Hover events are handled specially and are delivered 6883 * to {@link #onHoverEvent(MotionEvent)}. 6884 * </p> 6885 * 6886 * @param event The motion event to be dispatched. 6887 * @return True if the event was handled by the view, false otherwise. 6888 */ 6889 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6890 if (mInputEventConsistencyVerifier != null) { 6891 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6892 } 6893 6894 final int source = event.getSource(); 6895 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6896 final int action = event.getAction(); 6897 if (action == MotionEvent.ACTION_HOVER_ENTER 6898 || action == MotionEvent.ACTION_HOVER_MOVE 6899 || action == MotionEvent.ACTION_HOVER_EXIT) { 6900 if (dispatchHoverEvent(event)) { 6901 return true; 6902 } 6903 } else if (dispatchGenericPointerEvent(event)) { 6904 return true; 6905 } 6906 } else if (dispatchGenericFocusedEvent(event)) { 6907 return true; 6908 } 6909 6910 if (dispatchGenericMotionEventInternal(event)) { 6911 return true; 6912 } 6913 6914 if (mInputEventConsistencyVerifier != null) { 6915 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6916 } 6917 return false; 6918 } 6919 6920 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 6921 //noinspection SimplifiableIfStatement 6922 ListenerInfo li = mListenerInfo; 6923 if (li != null && li.mOnGenericMotionListener != null 6924 && (mViewFlags & ENABLED_MASK) == ENABLED 6925 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 6926 return true; 6927 } 6928 6929 if (onGenericMotionEvent(event)) { 6930 return true; 6931 } 6932 6933 if (mInputEventConsistencyVerifier != null) { 6934 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6935 } 6936 return false; 6937 } 6938 6939 /** 6940 * Dispatch a hover event. 6941 * <p> 6942 * Do not call this method directly. 6943 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6944 * </p> 6945 * 6946 * @param event The motion event to be dispatched. 6947 * @return True if the event was handled by the view, false otherwise. 6948 */ 6949 protected boolean dispatchHoverEvent(MotionEvent event) { 6950 //noinspection SimplifiableIfStatement 6951 ListenerInfo li = mListenerInfo; 6952 if (li != null && li.mOnHoverListener != null 6953 && (mViewFlags & ENABLED_MASK) == ENABLED 6954 && li.mOnHoverListener.onHover(this, event)) { 6955 return true; 6956 } 6957 6958 return onHoverEvent(event); 6959 } 6960 6961 /** 6962 * Returns true if the view has a child to which it has recently sent 6963 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 6964 * it does not have a hovered child, then it must be the innermost hovered view. 6965 * @hide 6966 */ 6967 protected boolean hasHoveredChild() { 6968 return false; 6969 } 6970 6971 /** 6972 * Dispatch a generic motion event to the view under the first pointer. 6973 * <p> 6974 * Do not call this method directly. 6975 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6976 * </p> 6977 * 6978 * @param event The motion event to be dispatched. 6979 * @return True if the event was handled by the view, false otherwise. 6980 */ 6981 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 6982 return false; 6983 } 6984 6985 /** 6986 * Dispatch a generic motion event to the currently focused view. 6987 * <p> 6988 * Do not call this method directly. 6989 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6990 * </p> 6991 * 6992 * @param event The motion event to be dispatched. 6993 * @return True if the event was handled by the view, false otherwise. 6994 */ 6995 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 6996 return false; 6997 } 6998 6999 /** 7000 * Dispatch a pointer event. 7001 * <p> 7002 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7003 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7004 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7005 * and should not be expected to handle other pointing device features. 7006 * </p> 7007 * 7008 * @param event The motion event to be dispatched. 7009 * @return True if the event was handled by the view, false otherwise. 7010 * @hide 7011 */ 7012 public final boolean dispatchPointerEvent(MotionEvent event) { 7013 if (event.isTouchEvent()) { 7014 return dispatchTouchEvent(event); 7015 } else { 7016 return dispatchGenericMotionEvent(event); 7017 } 7018 } 7019 7020 /** 7021 * Called when the window containing this view gains or loses window focus. 7022 * ViewGroups should override to route to their children. 7023 * 7024 * @param hasFocus True if the window containing this view now has focus, 7025 * false otherwise. 7026 */ 7027 public void dispatchWindowFocusChanged(boolean hasFocus) { 7028 onWindowFocusChanged(hasFocus); 7029 } 7030 7031 /** 7032 * Called when the window containing this view gains or loses focus. Note 7033 * that this is separate from view focus: to receive key events, both 7034 * your view and its window must have focus. If a window is displayed 7035 * on top of yours that takes input focus, then your own window will lose 7036 * focus but the view focus will remain unchanged. 7037 * 7038 * @param hasWindowFocus True if the window containing this view now has 7039 * focus, false otherwise. 7040 */ 7041 public void onWindowFocusChanged(boolean hasWindowFocus) { 7042 InputMethodManager imm = InputMethodManager.peekInstance(); 7043 if (!hasWindowFocus) { 7044 if (isPressed()) { 7045 setPressed(false); 7046 } 7047 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7048 imm.focusOut(this); 7049 } 7050 removeLongPressCallback(); 7051 removeTapCallback(); 7052 onFocusLost(); 7053 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7054 imm.focusIn(this); 7055 } 7056 refreshDrawableState(); 7057 } 7058 7059 /** 7060 * Returns true if this view is in a window that currently has window focus. 7061 * Note that this is not the same as the view itself having focus. 7062 * 7063 * @return True if this view is in a window that currently has window focus. 7064 */ 7065 public boolean hasWindowFocus() { 7066 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7067 } 7068 7069 /** 7070 * Dispatch a view visibility change down the view hierarchy. 7071 * ViewGroups should override to route to their children. 7072 * @param changedView The view whose visibility changed. Could be 'this' or 7073 * an ancestor view. 7074 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7075 * {@link #INVISIBLE} or {@link #GONE}. 7076 */ 7077 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7078 onVisibilityChanged(changedView, visibility); 7079 } 7080 7081 /** 7082 * Called when the visibility of the view or an ancestor of the view is changed. 7083 * @param changedView The view whose visibility changed. Could be 'this' or 7084 * an ancestor view. 7085 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7086 * {@link #INVISIBLE} or {@link #GONE}. 7087 */ 7088 protected void onVisibilityChanged(View changedView, int visibility) { 7089 if (visibility == VISIBLE) { 7090 if (mAttachInfo != null) { 7091 initialAwakenScrollBars(); 7092 } else { 7093 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 7094 } 7095 } 7096 } 7097 7098 /** 7099 * Dispatch a hint about whether this view is displayed. For instance, when 7100 * a View moves out of the screen, it might receives a display hint indicating 7101 * the view is not displayed. Applications should not <em>rely</em> on this hint 7102 * as there is no guarantee that they will receive one. 7103 * 7104 * @param hint A hint about whether or not this view is displayed: 7105 * {@link #VISIBLE} or {@link #INVISIBLE}. 7106 */ 7107 public void dispatchDisplayHint(int hint) { 7108 onDisplayHint(hint); 7109 } 7110 7111 /** 7112 * Gives this view a hint about whether is displayed or not. For instance, when 7113 * a View moves out of the screen, it might receives a display hint indicating 7114 * the view is not displayed. Applications should not <em>rely</em> on this hint 7115 * as there is no guarantee that they will receive one. 7116 * 7117 * @param hint A hint about whether or not this view is displayed: 7118 * {@link #VISIBLE} or {@link #INVISIBLE}. 7119 */ 7120 protected void onDisplayHint(int hint) { 7121 } 7122 7123 /** 7124 * Dispatch a window visibility change down the view hierarchy. 7125 * ViewGroups should override to route to their children. 7126 * 7127 * @param visibility The new visibility of the window. 7128 * 7129 * @see #onWindowVisibilityChanged(int) 7130 */ 7131 public void dispatchWindowVisibilityChanged(int visibility) { 7132 onWindowVisibilityChanged(visibility); 7133 } 7134 7135 /** 7136 * Called when the window containing has change its visibility 7137 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7138 * that this tells you whether or not your window is being made visible 7139 * to the window manager; this does <em>not</em> tell you whether or not 7140 * your window is obscured by other windows on the screen, even if it 7141 * is itself visible. 7142 * 7143 * @param visibility The new visibility of the window. 7144 */ 7145 protected void onWindowVisibilityChanged(int visibility) { 7146 if (visibility == VISIBLE) { 7147 initialAwakenScrollBars(); 7148 } 7149 } 7150 7151 /** 7152 * Returns the current visibility of the window this view is attached to 7153 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7154 * 7155 * @return Returns the current visibility of the view's window. 7156 */ 7157 public int getWindowVisibility() { 7158 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7159 } 7160 7161 /** 7162 * Retrieve the overall visible display size in which the window this view is 7163 * attached to has been positioned in. This takes into account screen 7164 * decorations above the window, for both cases where the window itself 7165 * is being position inside of them or the window is being placed under 7166 * then and covered insets are used for the window to position its content 7167 * inside. In effect, this tells you the available area where content can 7168 * be placed and remain visible to users. 7169 * 7170 * <p>This function requires an IPC back to the window manager to retrieve 7171 * the requested information, so should not be used in performance critical 7172 * code like drawing. 7173 * 7174 * @param outRect Filled in with the visible display frame. If the view 7175 * is not attached to a window, this is simply the raw display size. 7176 */ 7177 public void getWindowVisibleDisplayFrame(Rect outRect) { 7178 if (mAttachInfo != null) { 7179 try { 7180 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7181 } catch (RemoteException e) { 7182 return; 7183 } 7184 // XXX This is really broken, and probably all needs to be done 7185 // in the window manager, and we need to know more about whether 7186 // we want the area behind or in front of the IME. 7187 final Rect insets = mAttachInfo.mVisibleInsets; 7188 outRect.left += insets.left; 7189 outRect.top += insets.top; 7190 outRect.right -= insets.right; 7191 outRect.bottom -= insets.bottom; 7192 return; 7193 } 7194 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 7195 d.getRectSize(outRect); 7196 } 7197 7198 /** 7199 * Dispatch a notification about a resource configuration change down 7200 * the view hierarchy. 7201 * ViewGroups should override to route to their children. 7202 * 7203 * @param newConfig The new resource configuration. 7204 * 7205 * @see #onConfigurationChanged(android.content.res.Configuration) 7206 */ 7207 public void dispatchConfigurationChanged(Configuration newConfig) { 7208 onConfigurationChanged(newConfig); 7209 } 7210 7211 /** 7212 * Called when the current configuration of the resources being used 7213 * by the application have changed. You can use this to decide when 7214 * to reload resources that can changed based on orientation and other 7215 * configuration characterstics. You only need to use this if you are 7216 * not relying on the normal {@link android.app.Activity} mechanism of 7217 * recreating the activity instance upon a configuration change. 7218 * 7219 * @param newConfig The new resource configuration. 7220 */ 7221 protected void onConfigurationChanged(Configuration newConfig) { 7222 } 7223 7224 /** 7225 * Private function to aggregate all per-view attributes in to the view 7226 * root. 7227 */ 7228 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7229 performCollectViewAttributes(attachInfo, visibility); 7230 } 7231 7232 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7233 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7234 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7235 attachInfo.mKeepScreenOn = true; 7236 } 7237 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7238 ListenerInfo li = mListenerInfo; 7239 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7240 attachInfo.mHasSystemUiListeners = true; 7241 } 7242 } 7243 } 7244 7245 void needGlobalAttributesUpdate(boolean force) { 7246 final AttachInfo ai = mAttachInfo; 7247 if (ai != null) { 7248 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7249 || ai.mHasSystemUiListeners) { 7250 ai.mRecomputeGlobalAttributes = true; 7251 } 7252 } 7253 } 7254 7255 /** 7256 * Returns whether the device is currently in touch mode. Touch mode is entered 7257 * once the user begins interacting with the device by touch, and affects various 7258 * things like whether focus is always visible to the user. 7259 * 7260 * @return Whether the device is in touch mode. 7261 */ 7262 @ViewDebug.ExportedProperty 7263 public boolean isInTouchMode() { 7264 if (mAttachInfo != null) { 7265 return mAttachInfo.mInTouchMode; 7266 } else { 7267 return ViewRootImpl.isInTouchMode(); 7268 } 7269 } 7270 7271 /** 7272 * Returns the context the view is running in, through which it can 7273 * access the current theme, resources, etc. 7274 * 7275 * @return The view's Context. 7276 */ 7277 @ViewDebug.CapturedViewProperty 7278 public final Context getContext() { 7279 return mContext; 7280 } 7281 7282 /** 7283 * Handle a key event before it is processed by any input method 7284 * associated with the view hierarchy. This can be used to intercept 7285 * key events in special situations before the IME consumes them; a 7286 * typical example would be handling the BACK key to update the application's 7287 * UI instead of allowing the IME to see it and close itself. 7288 * 7289 * @param keyCode The value in event.getKeyCode(). 7290 * @param event Description of the key event. 7291 * @return If you handled the event, return true. If you want to allow the 7292 * event to be handled by the next receiver, return false. 7293 */ 7294 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7295 return false; 7296 } 7297 7298 /** 7299 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7300 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7301 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7302 * is released, if the view is enabled and clickable. 7303 * 7304 * @param keyCode A key code that represents the button pressed, from 7305 * {@link android.view.KeyEvent}. 7306 * @param event The KeyEvent object that defines the button action. 7307 */ 7308 public boolean onKeyDown(int keyCode, KeyEvent event) { 7309 boolean result = false; 7310 7311 switch (keyCode) { 7312 case KeyEvent.KEYCODE_DPAD_CENTER: 7313 case KeyEvent.KEYCODE_ENTER: { 7314 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7315 return true; 7316 } 7317 // Long clickable items don't necessarily have to be clickable 7318 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7319 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7320 (event.getRepeatCount() == 0)) { 7321 setPressed(true); 7322 checkForLongClick(0); 7323 return true; 7324 } 7325 break; 7326 } 7327 } 7328 return result; 7329 } 7330 7331 /** 7332 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7333 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7334 * the event). 7335 */ 7336 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7337 return false; 7338 } 7339 7340 /** 7341 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7342 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7343 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7344 * {@link KeyEvent#KEYCODE_ENTER} is released. 7345 * 7346 * @param keyCode A key code that represents the button pressed, from 7347 * {@link android.view.KeyEvent}. 7348 * @param event The KeyEvent object that defines the button action. 7349 */ 7350 public boolean onKeyUp(int keyCode, KeyEvent event) { 7351 boolean result = false; 7352 7353 switch (keyCode) { 7354 case KeyEvent.KEYCODE_DPAD_CENTER: 7355 case KeyEvent.KEYCODE_ENTER: { 7356 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7357 return true; 7358 } 7359 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7360 setPressed(false); 7361 7362 if (!mHasPerformedLongPress) { 7363 // This is a tap, so remove the longpress check 7364 removeLongPressCallback(); 7365 7366 result = performClick(); 7367 } 7368 } 7369 break; 7370 } 7371 } 7372 return result; 7373 } 7374 7375 /** 7376 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7377 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7378 * the event). 7379 * 7380 * @param keyCode A key code that represents the button pressed, from 7381 * {@link android.view.KeyEvent}. 7382 * @param repeatCount The number of times the action was made. 7383 * @param event The KeyEvent object that defines the button action. 7384 */ 7385 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7386 return false; 7387 } 7388 7389 /** 7390 * Called on the focused view when a key shortcut event is not handled. 7391 * Override this method to implement local key shortcuts for the View. 7392 * Key shortcuts can also be implemented by setting the 7393 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7394 * 7395 * @param keyCode The value in event.getKeyCode(). 7396 * @param event Description of the key event. 7397 * @return If you handled the event, return true. If you want to allow the 7398 * event to be handled by the next receiver, return false. 7399 */ 7400 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7401 return false; 7402 } 7403 7404 /** 7405 * Check whether the called view is a text editor, in which case it 7406 * would make sense to automatically display a soft input window for 7407 * it. Subclasses should override this if they implement 7408 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7409 * a call on that method would return a non-null InputConnection, and 7410 * they are really a first-class editor that the user would normally 7411 * start typing on when the go into a window containing your view. 7412 * 7413 * <p>The default implementation always returns false. This does 7414 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7415 * will not be called or the user can not otherwise perform edits on your 7416 * view; it is just a hint to the system that this is not the primary 7417 * purpose of this view. 7418 * 7419 * @return Returns true if this view is a text editor, else false. 7420 */ 7421 public boolean onCheckIsTextEditor() { 7422 return false; 7423 } 7424 7425 /** 7426 * Create a new InputConnection for an InputMethod to interact 7427 * with the view. The default implementation returns null, since it doesn't 7428 * support input methods. You can override this to implement such support. 7429 * This is only needed for views that take focus and text input. 7430 * 7431 * <p>When implementing this, you probably also want to implement 7432 * {@link #onCheckIsTextEditor()} to indicate you will return a 7433 * non-null InputConnection. 7434 * 7435 * @param outAttrs Fill in with attribute information about the connection. 7436 */ 7437 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7438 return null; 7439 } 7440 7441 /** 7442 * Called by the {@link android.view.inputmethod.InputMethodManager} 7443 * when a view who is not the current 7444 * input connection target is trying to make a call on the manager. The 7445 * default implementation returns false; you can override this to return 7446 * true for certain views if you are performing InputConnection proxying 7447 * to them. 7448 * @param view The View that is making the InputMethodManager call. 7449 * @return Return true to allow the call, false to reject. 7450 */ 7451 public boolean checkInputConnectionProxy(View view) { 7452 return false; 7453 } 7454 7455 /** 7456 * Show the context menu for this view. It is not safe to hold on to the 7457 * menu after returning from this method. 7458 * 7459 * You should normally not overload this method. Overload 7460 * {@link #onCreateContextMenu(ContextMenu)} or define an 7461 * {@link OnCreateContextMenuListener} to add items to the context menu. 7462 * 7463 * @param menu The context menu to populate 7464 */ 7465 public void createContextMenu(ContextMenu menu) { 7466 ContextMenuInfo menuInfo = getContextMenuInfo(); 7467 7468 // Sets the current menu info so all items added to menu will have 7469 // my extra info set. 7470 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7471 7472 onCreateContextMenu(menu); 7473 ListenerInfo li = mListenerInfo; 7474 if (li != null && li.mOnCreateContextMenuListener != null) { 7475 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7476 } 7477 7478 // Clear the extra information so subsequent items that aren't mine don't 7479 // have my extra info. 7480 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7481 7482 if (mParent != null) { 7483 mParent.createContextMenu(menu); 7484 } 7485 } 7486 7487 /** 7488 * Views should implement this if they have extra information to associate 7489 * with the context menu. The return result is supplied as a parameter to 7490 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7491 * callback. 7492 * 7493 * @return Extra information about the item for which the context menu 7494 * should be shown. This information will vary across different 7495 * subclasses of View. 7496 */ 7497 protected ContextMenuInfo getContextMenuInfo() { 7498 return null; 7499 } 7500 7501 /** 7502 * Views should implement this if the view itself is going to add items to 7503 * the context menu. 7504 * 7505 * @param menu the context menu to populate 7506 */ 7507 protected void onCreateContextMenu(ContextMenu menu) { 7508 } 7509 7510 /** 7511 * Implement this method to handle trackball motion events. The 7512 * <em>relative</em> movement of the trackball since the last event 7513 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7514 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7515 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7516 * they will often be fractional values, representing the more fine-grained 7517 * movement information available from a trackball). 7518 * 7519 * @param event The motion event. 7520 * @return True if the event was handled, false otherwise. 7521 */ 7522 public boolean onTrackballEvent(MotionEvent event) { 7523 return false; 7524 } 7525 7526 /** 7527 * Implement this method to handle generic motion events. 7528 * <p> 7529 * Generic motion events describe joystick movements, mouse hovers, track pad 7530 * touches, scroll wheel movements and other input events. The 7531 * {@link MotionEvent#getSource() source} of the motion event specifies 7532 * the class of input that was received. Implementations of this method 7533 * must examine the bits in the source before processing the event. 7534 * The following code example shows how this is done. 7535 * </p><p> 7536 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7537 * are delivered to the view under the pointer. All other generic motion events are 7538 * delivered to the focused view. 7539 * </p> 7540 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7541 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7542 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7543 * // process the joystick movement... 7544 * return true; 7545 * } 7546 * } 7547 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7548 * switch (event.getAction()) { 7549 * case MotionEvent.ACTION_HOVER_MOVE: 7550 * // process the mouse hover movement... 7551 * return true; 7552 * case MotionEvent.ACTION_SCROLL: 7553 * // process the scroll wheel movement... 7554 * return true; 7555 * } 7556 * } 7557 * return super.onGenericMotionEvent(event); 7558 * }</pre> 7559 * 7560 * @param event The generic motion event being processed. 7561 * @return True if the event was handled, false otherwise. 7562 */ 7563 public boolean onGenericMotionEvent(MotionEvent event) { 7564 return false; 7565 } 7566 7567 /** 7568 * Implement this method to handle hover events. 7569 * <p> 7570 * This method is called whenever a pointer is hovering into, over, or out of the 7571 * bounds of a view and the view is not currently being touched. 7572 * Hover events are represented as pointer events with action 7573 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7574 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7575 * </p> 7576 * <ul> 7577 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7578 * when the pointer enters the bounds of the view.</li> 7579 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7580 * when the pointer has already entered the bounds of the view and has moved.</li> 7581 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7582 * when the pointer has exited the bounds of the view or when the pointer is 7583 * about to go down due to a button click, tap, or similar user action that 7584 * causes the view to be touched.</li> 7585 * </ul> 7586 * <p> 7587 * The view should implement this method to return true to indicate that it is 7588 * handling the hover event, such as by changing its drawable state. 7589 * </p><p> 7590 * The default implementation calls {@link #setHovered} to update the hovered state 7591 * of the view when a hover enter or hover exit event is received, if the view 7592 * is enabled and is clickable. The default implementation also sends hover 7593 * accessibility events. 7594 * </p> 7595 * 7596 * @param event The motion event that describes the hover. 7597 * @return True if the view handled the hover event. 7598 * 7599 * @see #isHovered 7600 * @see #setHovered 7601 * @see #onHoverChanged 7602 */ 7603 public boolean onHoverEvent(MotionEvent event) { 7604 // The root view may receive hover (or touch) events that are outside the bounds of 7605 // the window. This code ensures that we only send accessibility events for 7606 // hovers that are actually within the bounds of the root view. 7607 final int action = event.getActionMasked(); 7608 if (!mSendingHoverAccessibilityEvents) { 7609 if ((action == MotionEvent.ACTION_HOVER_ENTER 7610 || action == MotionEvent.ACTION_HOVER_MOVE) 7611 && !hasHoveredChild() 7612 && pointInView(event.getX(), event.getY())) { 7613 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7614 mSendingHoverAccessibilityEvents = true; 7615 requestAccessibilityFocusFromHover((int) event.getX(), (int) event.getY()); 7616 } 7617 } else { 7618 if (action == MotionEvent.ACTION_HOVER_EXIT 7619 || (action == MotionEvent.ACTION_MOVE 7620 && !pointInView(event.getX(), event.getY()))) { 7621 mSendingHoverAccessibilityEvents = false; 7622 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7623 // If the window does not have input focus we take away accessibility 7624 // focus as soon as the user stop hovering over the view. 7625 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7626 getViewRootImpl().setAccessibilityFocusedHost(null); 7627 } 7628 } 7629 } 7630 7631 if (isHoverable()) { 7632 switch (action) { 7633 case MotionEvent.ACTION_HOVER_ENTER: 7634 setHovered(true); 7635 break; 7636 case MotionEvent.ACTION_HOVER_EXIT: 7637 setHovered(false); 7638 break; 7639 } 7640 7641 // Dispatch the event to onGenericMotionEvent before returning true. 7642 // This is to provide compatibility with existing applications that 7643 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7644 // break because of the new default handling for hoverable views 7645 // in onHoverEvent. 7646 // Note that onGenericMotionEvent will be called by default when 7647 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7648 dispatchGenericMotionEventInternal(event); 7649 return true; 7650 } 7651 7652 return false; 7653 } 7654 7655 /** 7656 * Returns true if the view should handle {@link #onHoverEvent} 7657 * by calling {@link #setHovered} to change its hovered state. 7658 * 7659 * @return True if the view is hoverable. 7660 */ 7661 private boolean isHoverable() { 7662 final int viewFlags = mViewFlags; 7663 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7664 return false; 7665 } 7666 7667 return (viewFlags & CLICKABLE) == CLICKABLE 7668 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7669 } 7670 7671 /** 7672 * Returns true if the view is currently hovered. 7673 * 7674 * @return True if the view is currently hovered. 7675 * 7676 * @see #setHovered 7677 * @see #onHoverChanged 7678 */ 7679 @ViewDebug.ExportedProperty 7680 public boolean isHovered() { 7681 return (mPrivateFlags & HOVERED) != 0; 7682 } 7683 7684 /** 7685 * Sets whether the view is currently hovered. 7686 * <p> 7687 * Calling this method also changes the drawable state of the view. This 7688 * enables the view to react to hover by using different drawable resources 7689 * to change its appearance. 7690 * </p><p> 7691 * The {@link #onHoverChanged} method is called when the hovered state changes. 7692 * </p> 7693 * 7694 * @param hovered True if the view is hovered. 7695 * 7696 * @see #isHovered 7697 * @see #onHoverChanged 7698 */ 7699 public void setHovered(boolean hovered) { 7700 if (hovered) { 7701 if ((mPrivateFlags & HOVERED) == 0) { 7702 mPrivateFlags |= HOVERED; 7703 refreshDrawableState(); 7704 onHoverChanged(true); 7705 } 7706 } else { 7707 if ((mPrivateFlags & HOVERED) != 0) { 7708 mPrivateFlags &= ~HOVERED; 7709 refreshDrawableState(); 7710 onHoverChanged(false); 7711 } 7712 } 7713 } 7714 7715 /** 7716 * Implement this method to handle hover state changes. 7717 * <p> 7718 * This method is called whenever the hover state changes as a result of a 7719 * call to {@link #setHovered}. 7720 * </p> 7721 * 7722 * @param hovered The current hover state, as returned by {@link #isHovered}. 7723 * 7724 * @see #isHovered 7725 * @see #setHovered 7726 */ 7727 public void onHoverChanged(boolean hovered) { 7728 } 7729 7730 /** 7731 * Implement this method to handle touch screen motion events. 7732 * 7733 * @param event The motion event. 7734 * @return True if the event was handled, false otherwise. 7735 */ 7736 public boolean onTouchEvent(MotionEvent event) { 7737 final int viewFlags = mViewFlags; 7738 7739 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7740 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7741 setPressed(false); 7742 } 7743 // A disabled view that is clickable still consumes the touch 7744 // events, it just doesn't respond to them. 7745 return (((viewFlags & CLICKABLE) == CLICKABLE || 7746 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7747 } 7748 7749 if (mTouchDelegate != null) { 7750 if (mTouchDelegate.onTouchEvent(event)) { 7751 return true; 7752 } 7753 } 7754 7755 if (((viewFlags & CLICKABLE) == CLICKABLE || 7756 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7757 switch (event.getAction()) { 7758 case MotionEvent.ACTION_UP: 7759 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7760 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7761 // take focus if we don't have it already and we should in 7762 // touch mode. 7763 boolean focusTaken = false; 7764 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7765 focusTaken = requestFocus(); 7766 } 7767 7768 if (prepressed) { 7769 // The button is being released before we actually 7770 // showed it as pressed. Make it show the pressed 7771 // state now (before scheduling the click) to ensure 7772 // the user sees it. 7773 setPressed(true); 7774 } 7775 7776 if (!mHasPerformedLongPress) { 7777 // This is a tap, so remove the longpress check 7778 removeLongPressCallback(); 7779 7780 // Only perform take click actions if we were in the pressed state 7781 if (!focusTaken) { 7782 // Use a Runnable and post this rather than calling 7783 // performClick directly. This lets other visual state 7784 // of the view update before click actions start. 7785 if (mPerformClick == null) { 7786 mPerformClick = new PerformClick(); 7787 } 7788 if (!post(mPerformClick)) { 7789 performClick(); 7790 } 7791 } 7792 } 7793 7794 if (mUnsetPressedState == null) { 7795 mUnsetPressedState = new UnsetPressedState(); 7796 } 7797 7798 if (prepressed) { 7799 postDelayed(mUnsetPressedState, 7800 ViewConfiguration.getPressedStateDuration()); 7801 } else if (!post(mUnsetPressedState)) { 7802 // If the post failed, unpress right now 7803 mUnsetPressedState.run(); 7804 } 7805 removeTapCallback(); 7806 } 7807 break; 7808 7809 case MotionEvent.ACTION_DOWN: 7810 mHasPerformedLongPress = false; 7811 7812 if (performButtonActionOnTouchDown(event)) { 7813 break; 7814 } 7815 7816 // Walk up the hierarchy to determine if we're inside a scrolling container. 7817 boolean isInScrollingContainer = isInScrollingContainer(); 7818 7819 // For views inside a scrolling container, delay the pressed feedback for 7820 // a short period in case this is a scroll. 7821 if (isInScrollingContainer) { 7822 mPrivateFlags |= PREPRESSED; 7823 if (mPendingCheckForTap == null) { 7824 mPendingCheckForTap = new CheckForTap(); 7825 } 7826 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7827 } else { 7828 // Not inside a scrolling container, so show the feedback right away 7829 setPressed(true); 7830 checkForLongClick(0); 7831 } 7832 break; 7833 7834 case MotionEvent.ACTION_CANCEL: 7835 setPressed(false); 7836 removeTapCallback(); 7837 break; 7838 7839 case MotionEvent.ACTION_MOVE: 7840 final int x = (int) event.getX(); 7841 final int y = (int) event.getY(); 7842 7843 // Be lenient about moving outside of buttons 7844 if (!pointInView(x, y, mTouchSlop)) { 7845 // Outside button 7846 removeTapCallback(); 7847 if ((mPrivateFlags & PRESSED) != 0) { 7848 // Remove any future long press/tap checks 7849 removeLongPressCallback(); 7850 7851 setPressed(false); 7852 } 7853 } 7854 break; 7855 } 7856 return true; 7857 } 7858 7859 return false; 7860 } 7861 7862 /** 7863 * @hide 7864 */ 7865 public boolean isInScrollingContainer() { 7866 ViewParent p = getParent(); 7867 while (p != null && p instanceof ViewGroup) { 7868 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7869 return true; 7870 } 7871 p = p.getParent(); 7872 } 7873 return false; 7874 } 7875 7876 /** 7877 * Remove the longpress detection timer. 7878 */ 7879 private void removeLongPressCallback() { 7880 if (mPendingCheckForLongPress != null) { 7881 removeCallbacks(mPendingCheckForLongPress); 7882 } 7883 } 7884 7885 /** 7886 * Remove the pending click action 7887 */ 7888 private void removePerformClickCallback() { 7889 if (mPerformClick != null) { 7890 removeCallbacks(mPerformClick); 7891 } 7892 } 7893 7894 /** 7895 * Remove the prepress detection timer. 7896 */ 7897 private void removeUnsetPressCallback() { 7898 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7899 setPressed(false); 7900 removeCallbacks(mUnsetPressedState); 7901 } 7902 } 7903 7904 /** 7905 * Remove the tap detection timer. 7906 */ 7907 private void removeTapCallback() { 7908 if (mPendingCheckForTap != null) { 7909 mPrivateFlags &= ~PREPRESSED; 7910 removeCallbacks(mPendingCheckForTap); 7911 } 7912 } 7913 7914 /** 7915 * Cancels a pending long press. Your subclass can use this if you 7916 * want the context menu to come up if the user presses and holds 7917 * at the same place, but you don't want it to come up if they press 7918 * and then move around enough to cause scrolling. 7919 */ 7920 public void cancelLongPress() { 7921 removeLongPressCallback(); 7922 7923 /* 7924 * The prepressed state handled by the tap callback is a display 7925 * construct, but the tap callback will post a long press callback 7926 * less its own timeout. Remove it here. 7927 */ 7928 removeTapCallback(); 7929 } 7930 7931 /** 7932 * Remove the pending callback for sending a 7933 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 7934 */ 7935 private void removeSendViewScrolledAccessibilityEventCallback() { 7936 if (mSendViewScrolledAccessibilityEvent != null) { 7937 removeCallbacks(mSendViewScrolledAccessibilityEvent); 7938 } 7939 } 7940 7941 /** 7942 * Sets the TouchDelegate for this View. 7943 */ 7944 public void setTouchDelegate(TouchDelegate delegate) { 7945 mTouchDelegate = delegate; 7946 } 7947 7948 /** 7949 * Gets the TouchDelegate for this View. 7950 */ 7951 public TouchDelegate getTouchDelegate() { 7952 return mTouchDelegate; 7953 } 7954 7955 /** 7956 * Set flags controlling behavior of this view. 7957 * 7958 * @param flags Constant indicating the value which should be set 7959 * @param mask Constant indicating the bit range that should be changed 7960 */ 7961 void setFlags(int flags, int mask) { 7962 int old = mViewFlags; 7963 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 7964 7965 int changed = mViewFlags ^ old; 7966 if (changed == 0) { 7967 return; 7968 } 7969 int privateFlags = mPrivateFlags; 7970 7971 /* Check if the FOCUSABLE bit has changed */ 7972 if (((changed & FOCUSABLE_MASK) != 0) && 7973 ((privateFlags & HAS_BOUNDS) !=0)) { 7974 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 7975 && ((privateFlags & FOCUSED) != 0)) { 7976 /* Give up focus if we are no longer focusable */ 7977 clearFocus(); 7978 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 7979 && ((privateFlags & FOCUSED) == 0)) { 7980 /* 7981 * Tell the view system that we are now available to take focus 7982 * if no one else already has it. 7983 */ 7984 if (mParent != null) mParent.focusableViewAvailable(this); 7985 } 7986 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 7987 notifyAccessibilityStateChanged(); 7988 } 7989 } 7990 7991 if ((flags & VISIBILITY_MASK) == VISIBLE) { 7992 if ((changed & VISIBILITY_MASK) != 0) { 7993 /* 7994 * If this view is becoming visible, invalidate it in case it changed while 7995 * it was not visible. Marking it drawn ensures that the invalidation will 7996 * go through. 7997 */ 7998 mPrivateFlags |= DRAWN; 7999 invalidate(true); 8000 8001 needGlobalAttributesUpdate(true); 8002 8003 // a view becoming visible is worth notifying the parent 8004 // about in case nothing has focus. even if this specific view 8005 // isn't focusable, it may contain something that is, so let 8006 // the root view try to give this focus if nothing else does. 8007 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8008 mParent.focusableViewAvailable(this); 8009 } 8010 } 8011 } 8012 8013 /* Check if the GONE bit has changed */ 8014 if ((changed & GONE) != 0) { 8015 needGlobalAttributesUpdate(false); 8016 requestLayout(); 8017 8018 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8019 if (hasFocus()) clearFocus(); 8020 clearAccessibilityFocus(); 8021 destroyDrawingCache(); 8022 if (mParent instanceof View) { 8023 // GONE views noop invalidation, so invalidate the parent 8024 ((View) mParent).invalidate(true); 8025 } 8026 // Mark the view drawn to ensure that it gets invalidated properly the next 8027 // time it is visible and gets invalidated 8028 mPrivateFlags |= DRAWN; 8029 } 8030 if (mAttachInfo != null) { 8031 mAttachInfo.mViewVisibilityChanged = true; 8032 } 8033 } 8034 8035 /* Check if the VISIBLE bit has changed */ 8036 if ((changed & INVISIBLE) != 0) { 8037 needGlobalAttributesUpdate(false); 8038 /* 8039 * If this view is becoming invisible, set the DRAWN flag so that 8040 * the next invalidate() will not be skipped. 8041 */ 8042 mPrivateFlags |= DRAWN; 8043 8044 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8045 // root view becoming invisible shouldn't clear focus and accessibility focus 8046 if (getRootView() != this) { 8047 clearFocus(); 8048 clearAccessibilityFocus(); 8049 } 8050 } 8051 if (mAttachInfo != null) { 8052 mAttachInfo.mViewVisibilityChanged = true; 8053 } 8054 } 8055 8056 if ((changed & VISIBILITY_MASK) != 0) { 8057 if (mParent instanceof ViewGroup) { 8058 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8059 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8060 ((View) mParent).invalidate(true); 8061 } else if (mParent != null) { 8062 mParent.invalidateChild(this, null); 8063 } 8064 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8065 } 8066 8067 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8068 destroyDrawingCache(); 8069 } 8070 8071 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8072 destroyDrawingCache(); 8073 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8074 invalidateParentCaches(); 8075 } 8076 8077 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8078 destroyDrawingCache(); 8079 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8080 } 8081 8082 if ((changed & DRAW_MASK) != 0) { 8083 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8084 if (mBackground != null) { 8085 mPrivateFlags &= ~SKIP_DRAW; 8086 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8087 } else { 8088 mPrivateFlags |= SKIP_DRAW; 8089 } 8090 } else { 8091 mPrivateFlags &= ~SKIP_DRAW; 8092 } 8093 requestLayout(); 8094 invalidate(true); 8095 } 8096 8097 if ((changed & KEEP_SCREEN_ON) != 0) { 8098 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8099 mParent.recomputeViewAttributes(this); 8100 } 8101 } 8102 8103 if (AccessibilityManager.getInstance(mContext).isEnabled() 8104 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8105 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8106 notifyAccessibilityStateChanged(); 8107 } 8108 } 8109 8110 /** 8111 * Change the view's z order in the tree, so it's on top of other sibling 8112 * views 8113 */ 8114 public void bringToFront() { 8115 if (mParent != null) { 8116 mParent.bringChildToFront(this); 8117 } 8118 } 8119 8120 /** 8121 * This is called in response to an internal scroll in this view (i.e., the 8122 * view scrolled its own contents). This is typically as a result of 8123 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8124 * called. 8125 * 8126 * @param l Current horizontal scroll origin. 8127 * @param t Current vertical scroll origin. 8128 * @param oldl Previous horizontal scroll origin. 8129 * @param oldt Previous vertical scroll origin. 8130 */ 8131 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8132 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8133 postSendViewScrolledAccessibilityEventCallback(); 8134 } 8135 8136 mBackgroundSizeChanged = true; 8137 8138 final AttachInfo ai = mAttachInfo; 8139 if (ai != null) { 8140 ai.mViewScrollChanged = true; 8141 } 8142 } 8143 8144 /** 8145 * Interface definition for a callback to be invoked when the layout bounds of a view 8146 * changes due to layout processing. 8147 */ 8148 public interface OnLayoutChangeListener { 8149 /** 8150 * Called when the focus state of a view has changed. 8151 * 8152 * @param v The view whose state has changed. 8153 * @param left The new value of the view's left property. 8154 * @param top The new value of the view's top property. 8155 * @param right The new value of the view's right property. 8156 * @param bottom The new value of the view's bottom property. 8157 * @param oldLeft The previous value of the view's left property. 8158 * @param oldTop The previous value of the view's top property. 8159 * @param oldRight The previous value of the view's right property. 8160 * @param oldBottom The previous value of the view's bottom property. 8161 */ 8162 void onLayoutChange(View v, int left, int top, int right, int bottom, 8163 int oldLeft, int oldTop, int oldRight, int oldBottom); 8164 } 8165 8166 /** 8167 * This is called during layout when the size of this view has changed. If 8168 * you were just added to the view hierarchy, you're called with the old 8169 * values of 0. 8170 * 8171 * @param w Current width of this view. 8172 * @param h Current height of this view. 8173 * @param oldw Old width of this view. 8174 * @param oldh Old height of this view. 8175 */ 8176 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8177 } 8178 8179 /** 8180 * Called by draw to draw the child views. This may be overridden 8181 * by derived classes to gain control just before its children are drawn 8182 * (but after its own view has been drawn). 8183 * @param canvas the canvas on which to draw the view 8184 */ 8185 protected void dispatchDraw(Canvas canvas) { 8186 8187 } 8188 8189 /** 8190 * Gets the parent of this view. Note that the parent is a 8191 * ViewParent and not necessarily a View. 8192 * 8193 * @return Parent of this view. 8194 */ 8195 public final ViewParent getParent() { 8196 return mParent; 8197 } 8198 8199 /** 8200 * Set the horizontal scrolled position of your view. This will cause a call to 8201 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8202 * invalidated. 8203 * @param value the x position to scroll to 8204 */ 8205 public void setScrollX(int value) { 8206 scrollTo(value, mScrollY); 8207 } 8208 8209 /** 8210 * Set the vertical scrolled position of your view. This will cause a call to 8211 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8212 * invalidated. 8213 * @param value the y position to scroll to 8214 */ 8215 public void setScrollY(int value) { 8216 scrollTo(mScrollX, value); 8217 } 8218 8219 /** 8220 * Return the scrolled left position of this view. This is the left edge of 8221 * the displayed part of your view. You do not need to draw any pixels 8222 * farther left, since those are outside of the frame of your view on 8223 * screen. 8224 * 8225 * @return The left edge of the displayed part of your view, in pixels. 8226 */ 8227 public final int getScrollX() { 8228 return mScrollX; 8229 } 8230 8231 /** 8232 * Return the scrolled top position of this view. This is the top edge of 8233 * the displayed part of your view. You do not need to draw any pixels above 8234 * it, since those are outside of the frame of your view on screen. 8235 * 8236 * @return The top edge of the displayed part of your view, in pixels. 8237 */ 8238 public final int getScrollY() { 8239 return mScrollY; 8240 } 8241 8242 /** 8243 * Return the width of the your view. 8244 * 8245 * @return The width of your view, in pixels. 8246 */ 8247 @ViewDebug.ExportedProperty(category = "layout") 8248 public final int getWidth() { 8249 return mRight - mLeft; 8250 } 8251 8252 /** 8253 * Return the height of your view. 8254 * 8255 * @return The height of your view, in pixels. 8256 */ 8257 @ViewDebug.ExportedProperty(category = "layout") 8258 public final int getHeight() { 8259 return mBottom - mTop; 8260 } 8261 8262 /** 8263 * Return the visible drawing bounds of your view. Fills in the output 8264 * rectangle with the values from getScrollX(), getScrollY(), 8265 * getWidth(), and getHeight(). 8266 * 8267 * @param outRect The (scrolled) drawing bounds of the view. 8268 */ 8269 public void getDrawingRect(Rect outRect) { 8270 outRect.left = mScrollX; 8271 outRect.top = mScrollY; 8272 outRect.right = mScrollX + (mRight - mLeft); 8273 outRect.bottom = mScrollY + (mBottom - mTop); 8274 } 8275 8276 /** 8277 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8278 * raw width component (that is the result is masked by 8279 * {@link #MEASURED_SIZE_MASK}). 8280 * 8281 * @return The raw measured width of this view. 8282 */ 8283 public final int getMeasuredWidth() { 8284 return mMeasuredWidth & MEASURED_SIZE_MASK; 8285 } 8286 8287 /** 8288 * Return the full width measurement information for this view as computed 8289 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8290 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8291 * This should be used during measurement and layout calculations only. Use 8292 * {@link #getWidth()} to see how wide a view is after layout. 8293 * 8294 * @return The measured width of this view as a bit mask. 8295 */ 8296 public final int getMeasuredWidthAndState() { 8297 return mMeasuredWidth; 8298 } 8299 8300 /** 8301 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8302 * raw width component (that is the result is masked by 8303 * {@link #MEASURED_SIZE_MASK}). 8304 * 8305 * @return The raw measured height of this view. 8306 */ 8307 public final int getMeasuredHeight() { 8308 return mMeasuredHeight & MEASURED_SIZE_MASK; 8309 } 8310 8311 /** 8312 * Return the full height measurement information for this view as computed 8313 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8314 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8315 * This should be used during measurement and layout calculations only. Use 8316 * {@link #getHeight()} to see how wide a view is after layout. 8317 * 8318 * @return The measured width of this view as a bit mask. 8319 */ 8320 public final int getMeasuredHeightAndState() { 8321 return mMeasuredHeight; 8322 } 8323 8324 /** 8325 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8326 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8327 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8328 * and the height component is at the shifted bits 8329 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8330 */ 8331 public final int getMeasuredState() { 8332 return (mMeasuredWidth&MEASURED_STATE_MASK) 8333 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8334 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8335 } 8336 8337 /** 8338 * The transform matrix of this view, which is calculated based on the current 8339 * roation, scale, and pivot properties. 8340 * 8341 * @see #getRotation() 8342 * @see #getScaleX() 8343 * @see #getScaleY() 8344 * @see #getPivotX() 8345 * @see #getPivotY() 8346 * @return The current transform matrix for the view 8347 */ 8348 public Matrix getMatrix() { 8349 if (mTransformationInfo != null) { 8350 updateMatrix(); 8351 return mTransformationInfo.mMatrix; 8352 } 8353 return Matrix.IDENTITY_MATRIX; 8354 } 8355 8356 /** 8357 * Utility function to determine if the value is far enough away from zero to be 8358 * considered non-zero. 8359 * @param value A floating point value to check for zero-ness 8360 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8361 */ 8362 private static boolean nonzero(float value) { 8363 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8364 } 8365 8366 /** 8367 * Returns true if the transform matrix is the identity matrix. 8368 * Recomputes the matrix if necessary. 8369 * 8370 * @return True if the transform matrix is the identity matrix, false otherwise. 8371 */ 8372 final boolean hasIdentityMatrix() { 8373 if (mTransformationInfo != null) { 8374 updateMatrix(); 8375 return mTransformationInfo.mMatrixIsIdentity; 8376 } 8377 return true; 8378 } 8379 8380 void ensureTransformationInfo() { 8381 if (mTransformationInfo == null) { 8382 mTransformationInfo = new TransformationInfo(); 8383 } 8384 } 8385 8386 /** 8387 * Recomputes the transform matrix if necessary. 8388 */ 8389 private void updateMatrix() { 8390 final TransformationInfo info = mTransformationInfo; 8391 if (info == null) { 8392 return; 8393 } 8394 if (info.mMatrixDirty) { 8395 // transform-related properties have changed since the last time someone 8396 // asked for the matrix; recalculate it with the current values 8397 8398 // Figure out if we need to update the pivot point 8399 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8400 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8401 info.mPrevWidth = mRight - mLeft; 8402 info.mPrevHeight = mBottom - mTop; 8403 info.mPivotX = info.mPrevWidth / 2f; 8404 info.mPivotY = info.mPrevHeight / 2f; 8405 } 8406 } 8407 info.mMatrix.reset(); 8408 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8409 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8410 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8411 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8412 } else { 8413 if (info.mCamera == null) { 8414 info.mCamera = new Camera(); 8415 info.matrix3D = new Matrix(); 8416 } 8417 info.mCamera.save(); 8418 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8419 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8420 info.mCamera.getMatrix(info.matrix3D); 8421 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8422 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8423 info.mPivotY + info.mTranslationY); 8424 info.mMatrix.postConcat(info.matrix3D); 8425 info.mCamera.restore(); 8426 } 8427 info.mMatrixDirty = false; 8428 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8429 info.mInverseMatrixDirty = true; 8430 } 8431 } 8432 8433 /** 8434 * Utility method to retrieve the inverse of the current mMatrix property. 8435 * We cache the matrix to avoid recalculating it when transform properties 8436 * have not changed. 8437 * 8438 * @return The inverse of the current matrix of this view. 8439 */ 8440 final Matrix getInverseMatrix() { 8441 final TransformationInfo info = mTransformationInfo; 8442 if (info != null) { 8443 updateMatrix(); 8444 if (info.mInverseMatrixDirty) { 8445 if (info.mInverseMatrix == null) { 8446 info.mInverseMatrix = new Matrix(); 8447 } 8448 info.mMatrix.invert(info.mInverseMatrix); 8449 info.mInverseMatrixDirty = false; 8450 } 8451 return info.mInverseMatrix; 8452 } 8453 return Matrix.IDENTITY_MATRIX; 8454 } 8455 8456 /** 8457 * Gets the distance along the Z axis from the camera to this view. 8458 * 8459 * @see #setCameraDistance(float) 8460 * 8461 * @return The distance along the Z axis. 8462 */ 8463 public float getCameraDistance() { 8464 ensureTransformationInfo(); 8465 final float dpi = mResources.getDisplayMetrics().densityDpi; 8466 final TransformationInfo info = mTransformationInfo; 8467 if (info.mCamera == null) { 8468 info.mCamera = new Camera(); 8469 info.matrix3D = new Matrix(); 8470 } 8471 return -(info.mCamera.getLocationZ() * dpi); 8472 } 8473 8474 /** 8475 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8476 * views are drawn) from the camera to this view. The camera's distance 8477 * affects 3D transformations, for instance rotations around the X and Y 8478 * axis. If the rotationX or rotationY properties are changed and this view is 8479 * large (more than half the size of the screen), it is recommended to always 8480 * use a camera distance that's greater than the height (X axis rotation) or 8481 * the width (Y axis rotation) of this view.</p> 8482 * 8483 * <p>The distance of the camera from the view plane can have an affect on the 8484 * perspective distortion of the view when it is rotated around the x or y axis. 8485 * For example, a large distance will result in a large viewing angle, and there 8486 * will not be much perspective distortion of the view as it rotates. A short 8487 * distance may cause much more perspective distortion upon rotation, and can 8488 * also result in some drawing artifacts if the rotated view ends up partially 8489 * behind the camera (which is why the recommendation is to use a distance at 8490 * least as far as the size of the view, if the view is to be rotated.)</p> 8491 * 8492 * <p>The distance is expressed in "depth pixels." The default distance depends 8493 * on the screen density. For instance, on a medium density display, the 8494 * default distance is 1280. On a high density display, the default distance 8495 * is 1920.</p> 8496 * 8497 * <p>If you want to specify a distance that leads to visually consistent 8498 * results across various densities, use the following formula:</p> 8499 * <pre> 8500 * float scale = context.getResources().getDisplayMetrics().density; 8501 * view.setCameraDistance(distance * scale); 8502 * </pre> 8503 * 8504 * <p>The density scale factor of a high density display is 1.5, 8505 * and 1920 = 1280 * 1.5.</p> 8506 * 8507 * @param distance The distance in "depth pixels", if negative the opposite 8508 * value is used 8509 * 8510 * @see #setRotationX(float) 8511 * @see #setRotationY(float) 8512 */ 8513 public void setCameraDistance(float distance) { 8514 invalidateViewProperty(true, false); 8515 8516 ensureTransformationInfo(); 8517 final float dpi = mResources.getDisplayMetrics().densityDpi; 8518 final TransformationInfo info = mTransformationInfo; 8519 if (info.mCamera == null) { 8520 info.mCamera = new Camera(); 8521 info.matrix3D = new Matrix(); 8522 } 8523 8524 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8525 info.mMatrixDirty = true; 8526 8527 invalidateViewProperty(false, false); 8528 if (mDisplayList != null) { 8529 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8530 } 8531 } 8532 8533 /** 8534 * The degrees that the view is rotated around the pivot point. 8535 * 8536 * @see #setRotation(float) 8537 * @see #getPivotX() 8538 * @see #getPivotY() 8539 * 8540 * @return The degrees of rotation. 8541 */ 8542 @ViewDebug.ExportedProperty(category = "drawing") 8543 public float getRotation() { 8544 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8545 } 8546 8547 /** 8548 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8549 * result in clockwise rotation. 8550 * 8551 * @param rotation The degrees of rotation. 8552 * 8553 * @see #getRotation() 8554 * @see #getPivotX() 8555 * @see #getPivotY() 8556 * @see #setRotationX(float) 8557 * @see #setRotationY(float) 8558 * 8559 * @attr ref android.R.styleable#View_rotation 8560 */ 8561 public void setRotation(float rotation) { 8562 ensureTransformationInfo(); 8563 final TransformationInfo info = mTransformationInfo; 8564 if (info.mRotation != rotation) { 8565 // Double-invalidation is necessary to capture view's old and new areas 8566 invalidateViewProperty(true, false); 8567 info.mRotation = rotation; 8568 info.mMatrixDirty = true; 8569 invalidateViewProperty(false, true); 8570 if (mDisplayList != null) { 8571 mDisplayList.setRotation(rotation); 8572 } 8573 } 8574 } 8575 8576 /** 8577 * The degrees that the view is rotated around the vertical axis through the pivot point. 8578 * 8579 * @see #getPivotX() 8580 * @see #getPivotY() 8581 * @see #setRotationY(float) 8582 * 8583 * @return The degrees of Y rotation. 8584 */ 8585 @ViewDebug.ExportedProperty(category = "drawing") 8586 public float getRotationY() { 8587 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8588 } 8589 8590 /** 8591 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8592 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8593 * down the y axis. 8594 * 8595 * When rotating large views, it is recommended to adjust the camera distance 8596 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8597 * 8598 * @param rotationY The degrees of Y rotation. 8599 * 8600 * @see #getRotationY() 8601 * @see #getPivotX() 8602 * @see #getPivotY() 8603 * @see #setRotation(float) 8604 * @see #setRotationX(float) 8605 * @see #setCameraDistance(float) 8606 * 8607 * @attr ref android.R.styleable#View_rotationY 8608 */ 8609 public void setRotationY(float rotationY) { 8610 ensureTransformationInfo(); 8611 final TransformationInfo info = mTransformationInfo; 8612 if (info.mRotationY != rotationY) { 8613 invalidateViewProperty(true, false); 8614 info.mRotationY = rotationY; 8615 info.mMatrixDirty = true; 8616 invalidateViewProperty(false, true); 8617 if (mDisplayList != null) { 8618 mDisplayList.setRotationY(rotationY); 8619 } 8620 } 8621 } 8622 8623 /** 8624 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8625 * 8626 * @see #getPivotX() 8627 * @see #getPivotY() 8628 * @see #setRotationX(float) 8629 * 8630 * @return The degrees of X rotation. 8631 */ 8632 @ViewDebug.ExportedProperty(category = "drawing") 8633 public float getRotationX() { 8634 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8635 } 8636 8637 /** 8638 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8639 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8640 * x axis. 8641 * 8642 * When rotating large views, it is recommended to adjust the camera distance 8643 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8644 * 8645 * @param rotationX The degrees of X rotation. 8646 * 8647 * @see #getRotationX() 8648 * @see #getPivotX() 8649 * @see #getPivotY() 8650 * @see #setRotation(float) 8651 * @see #setRotationY(float) 8652 * @see #setCameraDistance(float) 8653 * 8654 * @attr ref android.R.styleable#View_rotationX 8655 */ 8656 public void setRotationX(float rotationX) { 8657 ensureTransformationInfo(); 8658 final TransformationInfo info = mTransformationInfo; 8659 if (info.mRotationX != rotationX) { 8660 invalidateViewProperty(true, false); 8661 info.mRotationX = rotationX; 8662 info.mMatrixDirty = true; 8663 invalidateViewProperty(false, true); 8664 if (mDisplayList != null) { 8665 mDisplayList.setRotationX(rotationX); 8666 } 8667 } 8668 } 8669 8670 /** 8671 * The amount that the view is scaled in x around the pivot point, as a proportion of 8672 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8673 * 8674 * <p>By default, this is 1.0f. 8675 * 8676 * @see #getPivotX() 8677 * @see #getPivotY() 8678 * @return The scaling factor. 8679 */ 8680 @ViewDebug.ExportedProperty(category = "drawing") 8681 public float getScaleX() { 8682 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8683 } 8684 8685 /** 8686 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8687 * the view's unscaled width. A value of 1 means that no scaling is applied. 8688 * 8689 * @param scaleX The scaling factor. 8690 * @see #getPivotX() 8691 * @see #getPivotY() 8692 * 8693 * @attr ref android.R.styleable#View_scaleX 8694 */ 8695 public void setScaleX(float scaleX) { 8696 ensureTransformationInfo(); 8697 final TransformationInfo info = mTransformationInfo; 8698 if (info.mScaleX != scaleX) { 8699 invalidateViewProperty(true, false); 8700 info.mScaleX = scaleX; 8701 info.mMatrixDirty = true; 8702 invalidateViewProperty(false, true); 8703 if (mDisplayList != null) { 8704 mDisplayList.setScaleX(scaleX); 8705 } 8706 } 8707 } 8708 8709 /** 8710 * The amount that the view is scaled in y around the pivot point, as a proportion of 8711 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8712 * 8713 * <p>By default, this is 1.0f. 8714 * 8715 * @see #getPivotX() 8716 * @see #getPivotY() 8717 * @return The scaling factor. 8718 */ 8719 @ViewDebug.ExportedProperty(category = "drawing") 8720 public float getScaleY() { 8721 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8722 } 8723 8724 /** 8725 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8726 * the view's unscaled width. A value of 1 means that no scaling is applied. 8727 * 8728 * @param scaleY The scaling factor. 8729 * @see #getPivotX() 8730 * @see #getPivotY() 8731 * 8732 * @attr ref android.R.styleable#View_scaleY 8733 */ 8734 public void setScaleY(float scaleY) { 8735 ensureTransformationInfo(); 8736 final TransformationInfo info = mTransformationInfo; 8737 if (info.mScaleY != scaleY) { 8738 invalidateViewProperty(true, false); 8739 info.mScaleY = scaleY; 8740 info.mMatrixDirty = true; 8741 invalidateViewProperty(false, true); 8742 if (mDisplayList != null) { 8743 mDisplayList.setScaleY(scaleY); 8744 } 8745 } 8746 } 8747 8748 /** 8749 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8750 * and {@link #setScaleX(float) scaled}. 8751 * 8752 * @see #getRotation() 8753 * @see #getScaleX() 8754 * @see #getScaleY() 8755 * @see #getPivotY() 8756 * @return The x location of the pivot point. 8757 * 8758 * @attr ref android.R.styleable#View_transformPivotX 8759 */ 8760 @ViewDebug.ExportedProperty(category = "drawing") 8761 public float getPivotX() { 8762 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8763 } 8764 8765 /** 8766 * Sets the x location of the point around which the view is 8767 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8768 * By default, the pivot point is centered on the object. 8769 * Setting this property disables this behavior and causes the view to use only the 8770 * explicitly set pivotX and pivotY values. 8771 * 8772 * @param pivotX The x location of the pivot point. 8773 * @see #getRotation() 8774 * @see #getScaleX() 8775 * @see #getScaleY() 8776 * @see #getPivotY() 8777 * 8778 * @attr ref android.R.styleable#View_transformPivotX 8779 */ 8780 public void setPivotX(float pivotX) { 8781 ensureTransformationInfo(); 8782 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8783 final TransformationInfo info = mTransformationInfo; 8784 if (info.mPivotX != pivotX) { 8785 invalidateViewProperty(true, false); 8786 info.mPivotX = pivotX; 8787 info.mMatrixDirty = true; 8788 invalidateViewProperty(false, true); 8789 if (mDisplayList != null) { 8790 mDisplayList.setPivotX(pivotX); 8791 } 8792 } 8793 } 8794 8795 /** 8796 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8797 * and {@link #setScaleY(float) scaled}. 8798 * 8799 * @see #getRotation() 8800 * @see #getScaleX() 8801 * @see #getScaleY() 8802 * @see #getPivotY() 8803 * @return The y location of the pivot point. 8804 * 8805 * @attr ref android.R.styleable#View_transformPivotY 8806 */ 8807 @ViewDebug.ExportedProperty(category = "drawing") 8808 public float getPivotY() { 8809 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8810 } 8811 8812 /** 8813 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8814 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8815 * Setting this property disables this behavior and causes the view to use only the 8816 * explicitly set pivotX and pivotY values. 8817 * 8818 * @param pivotY The y location of the pivot point. 8819 * @see #getRotation() 8820 * @see #getScaleX() 8821 * @see #getScaleY() 8822 * @see #getPivotY() 8823 * 8824 * @attr ref android.R.styleable#View_transformPivotY 8825 */ 8826 public void setPivotY(float pivotY) { 8827 ensureTransformationInfo(); 8828 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8829 final TransformationInfo info = mTransformationInfo; 8830 if (info.mPivotY != pivotY) { 8831 invalidateViewProperty(true, false); 8832 info.mPivotY = pivotY; 8833 info.mMatrixDirty = true; 8834 invalidateViewProperty(false, true); 8835 if (mDisplayList != null) { 8836 mDisplayList.setPivotY(pivotY); 8837 } 8838 } 8839 } 8840 8841 /** 8842 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8843 * completely transparent and 1 means the view is completely opaque. 8844 * 8845 * <p>By default this is 1.0f. 8846 * @return The opacity of the view. 8847 */ 8848 @ViewDebug.ExportedProperty(category = "drawing") 8849 public float getAlpha() { 8850 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8851 } 8852 8853 /** 8854 * Returns whether this View has content which overlaps. This function, intended to be 8855 * overridden by specific View types, is an optimization when alpha is set on a view. If 8856 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8857 * and then composited it into place, which can be expensive. If the view has no overlapping 8858 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8859 * An example of overlapping rendering is a TextView with a background image, such as a 8860 * Button. An example of non-overlapping rendering is a TextView with no background, or 8861 * an ImageView with only the foreground image. The default implementation returns true; 8862 * subclasses should override if they have cases which can be optimized. 8863 * 8864 * @return true if the content in this view might overlap, false otherwise. 8865 */ 8866 public boolean hasOverlappingRendering() { 8867 return true; 8868 } 8869 8870 /** 8871 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8872 * completely transparent and 1 means the view is completely opaque.</p> 8873 * 8874 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8875 * responsible for applying the opacity itself. Otherwise, calling this method is 8876 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8877 * setting a hardware layer.</p> 8878 * 8879 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8880 * performance implications. It is generally best to use the alpha property sparingly and 8881 * transiently, as in the case of fading animations.</p> 8882 * 8883 * @param alpha The opacity of the view. 8884 * 8885 * @see #setLayerType(int, android.graphics.Paint) 8886 * 8887 * @attr ref android.R.styleable#View_alpha 8888 */ 8889 public void setAlpha(float alpha) { 8890 ensureTransformationInfo(); 8891 if (mTransformationInfo.mAlpha != alpha) { 8892 mTransformationInfo.mAlpha = alpha; 8893 if (onSetAlpha((int) (alpha * 255))) { 8894 mPrivateFlags |= ALPHA_SET; 8895 // subclass is handling alpha - don't optimize rendering cache invalidation 8896 invalidateParentCaches(); 8897 invalidate(true); 8898 } else { 8899 mPrivateFlags &= ~ALPHA_SET; 8900 invalidateViewProperty(true, false); 8901 if (mDisplayList != null) { 8902 mDisplayList.setAlpha(alpha); 8903 } 8904 } 8905 } 8906 } 8907 8908 /** 8909 * Faster version of setAlpha() which performs the same steps except there are 8910 * no calls to invalidate(). The caller of this function should perform proper invalidation 8911 * on the parent and this object. The return value indicates whether the subclass handles 8912 * alpha (the return value for onSetAlpha()). 8913 * 8914 * @param alpha The new value for the alpha property 8915 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 8916 * the new value for the alpha property is different from the old value 8917 */ 8918 boolean setAlphaNoInvalidation(float alpha) { 8919 ensureTransformationInfo(); 8920 if (mTransformationInfo.mAlpha != alpha) { 8921 mTransformationInfo.mAlpha = alpha; 8922 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 8923 if (subclassHandlesAlpha) { 8924 mPrivateFlags |= ALPHA_SET; 8925 return true; 8926 } else { 8927 mPrivateFlags &= ~ALPHA_SET; 8928 if (mDisplayList != null) { 8929 mDisplayList.setAlpha(alpha); 8930 } 8931 } 8932 } 8933 return false; 8934 } 8935 8936 /** 8937 * Top position of this view relative to its parent. 8938 * 8939 * @return The top of this view, in pixels. 8940 */ 8941 @ViewDebug.CapturedViewProperty 8942 public final int getTop() { 8943 return mTop; 8944 } 8945 8946 /** 8947 * Sets the top position of this view relative to its parent. This method is meant to be called 8948 * by the layout system and should not generally be called otherwise, because the property 8949 * may be changed at any time by the layout. 8950 * 8951 * @param top The top of this view, in pixels. 8952 */ 8953 public final void setTop(int top) { 8954 if (top != mTop) { 8955 updateMatrix(); 8956 final boolean matrixIsIdentity = mTransformationInfo == null 8957 || mTransformationInfo.mMatrixIsIdentity; 8958 if (matrixIsIdentity) { 8959 if (mAttachInfo != null) { 8960 int minTop; 8961 int yLoc; 8962 if (top < mTop) { 8963 minTop = top; 8964 yLoc = top - mTop; 8965 } else { 8966 minTop = mTop; 8967 yLoc = 0; 8968 } 8969 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 8970 } 8971 } else { 8972 // Double-invalidation is necessary to capture view's old and new areas 8973 invalidate(true); 8974 } 8975 8976 int width = mRight - mLeft; 8977 int oldHeight = mBottom - mTop; 8978 8979 mTop = top; 8980 if (mDisplayList != null) { 8981 mDisplayList.setTop(mTop); 8982 } 8983 8984 onSizeChanged(width, mBottom - mTop, width, oldHeight); 8985 8986 if (!matrixIsIdentity) { 8987 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8988 // A change in dimension means an auto-centered pivot point changes, too 8989 mTransformationInfo.mMatrixDirty = true; 8990 } 8991 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8992 invalidate(true); 8993 } 8994 mBackgroundSizeChanged = true; 8995 invalidateParentIfNeeded(); 8996 } 8997 } 8998 8999 /** 9000 * Bottom position of this view relative to its parent. 9001 * 9002 * @return The bottom of this view, in pixels. 9003 */ 9004 @ViewDebug.CapturedViewProperty 9005 public final int getBottom() { 9006 return mBottom; 9007 } 9008 9009 /** 9010 * True if this view has changed since the last time being drawn. 9011 * 9012 * @return The dirty state of this view. 9013 */ 9014 public boolean isDirty() { 9015 return (mPrivateFlags & DIRTY_MASK) != 0; 9016 } 9017 9018 /** 9019 * Sets the bottom position of this view relative to its parent. This method is meant to be 9020 * called by the layout system and should not generally be called otherwise, because the 9021 * property may be changed at any time by the layout. 9022 * 9023 * @param bottom The bottom of this view, in pixels. 9024 */ 9025 public final void setBottom(int bottom) { 9026 if (bottom != mBottom) { 9027 updateMatrix(); 9028 final boolean matrixIsIdentity = mTransformationInfo == null 9029 || mTransformationInfo.mMatrixIsIdentity; 9030 if (matrixIsIdentity) { 9031 if (mAttachInfo != null) { 9032 int maxBottom; 9033 if (bottom < mBottom) { 9034 maxBottom = mBottom; 9035 } else { 9036 maxBottom = bottom; 9037 } 9038 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9039 } 9040 } else { 9041 // Double-invalidation is necessary to capture view's old and new areas 9042 invalidate(true); 9043 } 9044 9045 int width = mRight - mLeft; 9046 int oldHeight = mBottom - mTop; 9047 9048 mBottom = bottom; 9049 if (mDisplayList != null) { 9050 mDisplayList.setBottom(mBottom); 9051 } 9052 9053 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9054 9055 if (!matrixIsIdentity) { 9056 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9057 // A change in dimension means an auto-centered pivot point changes, too 9058 mTransformationInfo.mMatrixDirty = true; 9059 } 9060 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9061 invalidate(true); 9062 } 9063 mBackgroundSizeChanged = true; 9064 invalidateParentIfNeeded(); 9065 } 9066 } 9067 9068 /** 9069 * Left position of this view relative to its parent. 9070 * 9071 * @return The left edge of this view, in pixels. 9072 */ 9073 @ViewDebug.CapturedViewProperty 9074 public final int getLeft() { 9075 return mLeft; 9076 } 9077 9078 /** 9079 * Sets the left position of this view relative to its parent. This method is meant to be called 9080 * by the layout system and should not generally be called otherwise, because the property 9081 * may be changed at any time by the layout. 9082 * 9083 * @param left The bottom of this view, in pixels. 9084 */ 9085 public final void setLeft(int left) { 9086 if (left != mLeft) { 9087 updateMatrix(); 9088 final boolean matrixIsIdentity = mTransformationInfo == null 9089 || mTransformationInfo.mMatrixIsIdentity; 9090 if (matrixIsIdentity) { 9091 if (mAttachInfo != null) { 9092 int minLeft; 9093 int xLoc; 9094 if (left < mLeft) { 9095 minLeft = left; 9096 xLoc = left - mLeft; 9097 } else { 9098 minLeft = mLeft; 9099 xLoc = 0; 9100 } 9101 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9102 } 9103 } else { 9104 // Double-invalidation is necessary to capture view's old and new areas 9105 invalidate(true); 9106 } 9107 9108 int oldWidth = mRight - mLeft; 9109 int height = mBottom - mTop; 9110 9111 mLeft = left; 9112 if (mDisplayList != null) { 9113 mDisplayList.setLeft(left); 9114 } 9115 9116 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9117 9118 if (!matrixIsIdentity) { 9119 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9120 // A change in dimension means an auto-centered pivot point changes, too 9121 mTransformationInfo.mMatrixDirty = true; 9122 } 9123 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9124 invalidate(true); 9125 } 9126 mBackgroundSizeChanged = true; 9127 invalidateParentIfNeeded(); 9128 } 9129 } 9130 9131 /** 9132 * Right position of this view relative to its parent. 9133 * 9134 * @return The right edge of this view, in pixels. 9135 */ 9136 @ViewDebug.CapturedViewProperty 9137 public final int getRight() { 9138 return mRight; 9139 } 9140 9141 /** 9142 * Sets the right position of this view relative to its parent. This method is meant to be called 9143 * by the layout system and should not generally be called otherwise, because the property 9144 * may be changed at any time by the layout. 9145 * 9146 * @param right The bottom of this view, in pixels. 9147 */ 9148 public final void setRight(int right) { 9149 if (right != mRight) { 9150 updateMatrix(); 9151 final boolean matrixIsIdentity = mTransformationInfo == null 9152 || mTransformationInfo.mMatrixIsIdentity; 9153 if (matrixIsIdentity) { 9154 if (mAttachInfo != null) { 9155 int maxRight; 9156 if (right < mRight) { 9157 maxRight = mRight; 9158 } else { 9159 maxRight = right; 9160 } 9161 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9162 } 9163 } else { 9164 // Double-invalidation is necessary to capture view's old and new areas 9165 invalidate(true); 9166 } 9167 9168 int oldWidth = mRight - mLeft; 9169 int height = mBottom - mTop; 9170 9171 mRight = right; 9172 if (mDisplayList != null) { 9173 mDisplayList.setRight(mRight); 9174 } 9175 9176 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9177 9178 if (!matrixIsIdentity) { 9179 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9180 // A change in dimension means an auto-centered pivot point changes, too 9181 mTransformationInfo.mMatrixDirty = true; 9182 } 9183 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9184 invalidate(true); 9185 } 9186 mBackgroundSizeChanged = true; 9187 invalidateParentIfNeeded(); 9188 } 9189 } 9190 9191 /** 9192 * The visual x position of this view, in pixels. This is equivalent to the 9193 * {@link #setTranslationX(float) translationX} property plus the current 9194 * {@link #getLeft() left} property. 9195 * 9196 * @return The visual x position of this view, in pixels. 9197 */ 9198 @ViewDebug.ExportedProperty(category = "drawing") 9199 public float getX() { 9200 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9201 } 9202 9203 /** 9204 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9205 * {@link #setTranslationX(float) translationX} property to be the difference between 9206 * the x value passed in and the current {@link #getLeft() left} property. 9207 * 9208 * @param x The visual x position of this view, in pixels. 9209 */ 9210 public void setX(float x) { 9211 setTranslationX(x - mLeft); 9212 } 9213 9214 /** 9215 * The visual y position of this view, in pixels. This is equivalent to the 9216 * {@link #setTranslationY(float) translationY} property plus the current 9217 * {@link #getTop() top} property. 9218 * 9219 * @return The visual y position of this view, in pixels. 9220 */ 9221 @ViewDebug.ExportedProperty(category = "drawing") 9222 public float getY() { 9223 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9224 } 9225 9226 /** 9227 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9228 * {@link #setTranslationY(float) translationY} property to be the difference between 9229 * the y value passed in and the current {@link #getTop() top} property. 9230 * 9231 * @param y The visual y position of this view, in pixels. 9232 */ 9233 public void setY(float y) { 9234 setTranslationY(y - mTop); 9235 } 9236 9237 9238 /** 9239 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9240 * This position is post-layout, in addition to wherever the object's 9241 * layout placed it. 9242 * 9243 * @return The horizontal position of this view relative to its left position, in pixels. 9244 */ 9245 @ViewDebug.ExportedProperty(category = "drawing") 9246 public float getTranslationX() { 9247 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9248 } 9249 9250 /** 9251 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9252 * This effectively positions the object post-layout, in addition to wherever the object's 9253 * layout placed it. 9254 * 9255 * @param translationX The horizontal position of this view relative to its left position, 9256 * in pixels. 9257 * 9258 * @attr ref android.R.styleable#View_translationX 9259 */ 9260 public void setTranslationX(float translationX) { 9261 ensureTransformationInfo(); 9262 final TransformationInfo info = mTransformationInfo; 9263 if (info.mTranslationX != translationX) { 9264 // Double-invalidation is necessary to capture view's old and new areas 9265 invalidateViewProperty(true, false); 9266 info.mTranslationX = translationX; 9267 info.mMatrixDirty = true; 9268 invalidateViewProperty(false, true); 9269 if (mDisplayList != null) { 9270 mDisplayList.setTranslationX(translationX); 9271 } 9272 } 9273 } 9274 9275 /** 9276 * The horizontal location of this view relative to its {@link #getTop() top} position. 9277 * This position is post-layout, in addition to wherever the object's 9278 * layout placed it. 9279 * 9280 * @return The vertical position of this view relative to its top position, 9281 * in pixels. 9282 */ 9283 @ViewDebug.ExportedProperty(category = "drawing") 9284 public float getTranslationY() { 9285 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9286 } 9287 9288 /** 9289 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9290 * This effectively positions the object post-layout, in addition to wherever the object's 9291 * layout placed it. 9292 * 9293 * @param translationY The vertical position of this view relative to its top position, 9294 * in pixels. 9295 * 9296 * @attr ref android.R.styleable#View_translationY 9297 */ 9298 public void setTranslationY(float translationY) { 9299 ensureTransformationInfo(); 9300 final TransformationInfo info = mTransformationInfo; 9301 if (info.mTranslationY != translationY) { 9302 invalidateViewProperty(true, false); 9303 info.mTranslationY = translationY; 9304 info.mMatrixDirty = true; 9305 invalidateViewProperty(false, true); 9306 if (mDisplayList != null) { 9307 mDisplayList.setTranslationY(translationY); 9308 } 9309 } 9310 } 9311 9312 /** 9313 * Hit rectangle in parent's coordinates 9314 * 9315 * @param outRect The hit rectangle of the view. 9316 */ 9317 public void getHitRect(Rect outRect) { 9318 updateMatrix(); 9319 final TransformationInfo info = mTransformationInfo; 9320 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9321 outRect.set(mLeft, mTop, mRight, mBottom); 9322 } else { 9323 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9324 tmpRect.set(-info.mPivotX, -info.mPivotY, 9325 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9326 info.mMatrix.mapRect(tmpRect); 9327 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9328 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9329 } 9330 } 9331 9332 /** 9333 * Determines whether the given point, in local coordinates is inside the view. 9334 */ 9335 /*package*/ final boolean pointInView(float localX, float localY) { 9336 return localX >= 0 && localX < (mRight - mLeft) 9337 && localY >= 0 && localY < (mBottom - mTop); 9338 } 9339 9340 /** 9341 * Utility method to determine whether the given point, in local coordinates, 9342 * is inside the view, where the area of the view is expanded by the slop factor. 9343 * This method is called while processing touch-move events to determine if the event 9344 * is still within the view. 9345 */ 9346 private boolean pointInView(float localX, float localY, float slop) { 9347 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9348 localY < ((mBottom - mTop) + slop); 9349 } 9350 9351 /** 9352 * When a view has focus and the user navigates away from it, the next view is searched for 9353 * starting from the rectangle filled in by this method. 9354 * 9355 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9356 * of the view. However, if your view maintains some idea of internal selection, 9357 * such as a cursor, or a selected row or column, you should override this method and 9358 * fill in a more specific rectangle. 9359 * 9360 * @param r The rectangle to fill in, in this view's coordinates. 9361 */ 9362 public void getFocusedRect(Rect r) { 9363 getDrawingRect(r); 9364 } 9365 9366 /** 9367 * If some part of this view is not clipped by any of its parents, then 9368 * return that area in r in global (root) coordinates. To convert r to local 9369 * coordinates (without taking possible View rotations into account), offset 9370 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9371 * If the view is completely clipped or translated out, return false. 9372 * 9373 * @param r If true is returned, r holds the global coordinates of the 9374 * visible portion of this view. 9375 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9376 * between this view and its root. globalOffet may be null. 9377 * @return true if r is non-empty (i.e. part of the view is visible at the 9378 * root level. 9379 */ 9380 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9381 int width = mRight - mLeft; 9382 int height = mBottom - mTop; 9383 if (width > 0 && height > 0) { 9384 r.set(0, 0, width, height); 9385 if (globalOffset != null) { 9386 globalOffset.set(-mScrollX, -mScrollY); 9387 } 9388 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9389 } 9390 return false; 9391 } 9392 9393 public final boolean getGlobalVisibleRect(Rect r) { 9394 return getGlobalVisibleRect(r, null); 9395 } 9396 9397 public final boolean getLocalVisibleRect(Rect r) { 9398 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9399 if (getGlobalVisibleRect(r, offset)) { 9400 r.offset(-offset.x, -offset.y); // make r local 9401 return true; 9402 } 9403 return false; 9404 } 9405 9406 /** 9407 * Offset this view's vertical location by the specified number of pixels. 9408 * 9409 * @param offset the number of pixels to offset the view by 9410 */ 9411 public void offsetTopAndBottom(int offset) { 9412 if (offset != 0) { 9413 updateMatrix(); 9414 final boolean matrixIsIdentity = mTransformationInfo == null 9415 || mTransformationInfo.mMatrixIsIdentity; 9416 if (matrixIsIdentity) { 9417 if (mDisplayList != null) { 9418 invalidateViewProperty(false, false); 9419 } else { 9420 final ViewParent p = mParent; 9421 if (p != null && mAttachInfo != null) { 9422 final Rect r = mAttachInfo.mTmpInvalRect; 9423 int minTop; 9424 int maxBottom; 9425 int yLoc; 9426 if (offset < 0) { 9427 minTop = mTop + offset; 9428 maxBottom = mBottom; 9429 yLoc = offset; 9430 } else { 9431 minTop = mTop; 9432 maxBottom = mBottom + offset; 9433 yLoc = 0; 9434 } 9435 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9436 p.invalidateChild(this, r); 9437 } 9438 } 9439 } else { 9440 invalidateViewProperty(false, false); 9441 } 9442 9443 mTop += offset; 9444 mBottom += offset; 9445 if (mDisplayList != null) { 9446 mDisplayList.offsetTopBottom(offset); 9447 invalidateViewProperty(false, false); 9448 } else { 9449 if (!matrixIsIdentity) { 9450 invalidateViewProperty(false, true); 9451 } 9452 invalidateParentIfNeeded(); 9453 } 9454 } 9455 } 9456 9457 /** 9458 * Offset this view's horizontal location by the specified amount of pixels. 9459 * 9460 * @param offset the numer of pixels to offset the view by 9461 */ 9462 public void offsetLeftAndRight(int offset) { 9463 if (offset != 0) { 9464 updateMatrix(); 9465 final boolean matrixIsIdentity = mTransformationInfo == null 9466 || mTransformationInfo.mMatrixIsIdentity; 9467 if (matrixIsIdentity) { 9468 if (mDisplayList != null) { 9469 invalidateViewProperty(false, false); 9470 } else { 9471 final ViewParent p = mParent; 9472 if (p != null && mAttachInfo != null) { 9473 final Rect r = mAttachInfo.mTmpInvalRect; 9474 int minLeft; 9475 int maxRight; 9476 if (offset < 0) { 9477 minLeft = mLeft + offset; 9478 maxRight = mRight; 9479 } else { 9480 minLeft = mLeft; 9481 maxRight = mRight + offset; 9482 } 9483 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9484 p.invalidateChild(this, r); 9485 } 9486 } 9487 } else { 9488 invalidateViewProperty(false, false); 9489 } 9490 9491 mLeft += offset; 9492 mRight += offset; 9493 if (mDisplayList != null) { 9494 mDisplayList.offsetLeftRight(offset); 9495 invalidateViewProperty(false, false); 9496 } else { 9497 if (!matrixIsIdentity) { 9498 invalidateViewProperty(false, true); 9499 } 9500 invalidateParentIfNeeded(); 9501 } 9502 } 9503 } 9504 9505 /** 9506 * Get the LayoutParams associated with this view. All views should have 9507 * layout parameters. These supply parameters to the <i>parent</i> of this 9508 * view specifying how it should be arranged. There are many subclasses of 9509 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9510 * of ViewGroup that are responsible for arranging their children. 9511 * 9512 * This method may return null if this View is not attached to a parent 9513 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9514 * was not invoked successfully. When a View is attached to a parent 9515 * ViewGroup, this method must not return null. 9516 * 9517 * @return The LayoutParams associated with this view, or null if no 9518 * parameters have been set yet 9519 */ 9520 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9521 public ViewGroup.LayoutParams getLayoutParams() { 9522 return mLayoutParams; 9523 } 9524 9525 /** 9526 * Set the layout parameters associated with this view. These supply 9527 * parameters to the <i>parent</i> of this view specifying how it should be 9528 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9529 * correspond to the different subclasses of ViewGroup that are responsible 9530 * for arranging their children. 9531 * 9532 * @param params The layout parameters for this view, cannot be null 9533 */ 9534 public void setLayoutParams(ViewGroup.LayoutParams params) { 9535 if (params == null) { 9536 throw new NullPointerException("Layout parameters cannot be null"); 9537 } 9538 mLayoutParams = params; 9539 if (mParent instanceof ViewGroup) { 9540 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9541 } 9542 requestLayout(); 9543 } 9544 9545 /** 9546 * Set the scrolled position of your view. This will cause a call to 9547 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9548 * invalidated. 9549 * @param x the x position to scroll to 9550 * @param y the y position to scroll to 9551 */ 9552 public void scrollTo(int x, int y) { 9553 if (mScrollX != x || mScrollY != y) { 9554 int oldX = mScrollX; 9555 int oldY = mScrollY; 9556 mScrollX = x; 9557 mScrollY = y; 9558 invalidateParentCaches(); 9559 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9560 if (!awakenScrollBars()) { 9561 postInvalidateOnAnimation(); 9562 } 9563 } 9564 } 9565 9566 /** 9567 * Move the scrolled position of your view. This will cause a call to 9568 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9569 * invalidated. 9570 * @param x the amount of pixels to scroll by horizontally 9571 * @param y the amount of pixels to scroll by vertically 9572 */ 9573 public void scrollBy(int x, int y) { 9574 scrollTo(mScrollX + x, mScrollY + y); 9575 } 9576 9577 /** 9578 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9579 * animation to fade the scrollbars out after a default delay. If a subclass 9580 * provides animated scrolling, the start delay should equal the duration 9581 * of the scrolling animation.</p> 9582 * 9583 * <p>The animation starts only if at least one of the scrollbars is 9584 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9585 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9586 * this method returns true, and false otherwise. If the animation is 9587 * started, this method calls {@link #invalidate()}; in that case the 9588 * caller should not call {@link #invalidate()}.</p> 9589 * 9590 * <p>This method should be invoked every time a subclass directly updates 9591 * the scroll parameters.</p> 9592 * 9593 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9594 * and {@link #scrollTo(int, int)}.</p> 9595 * 9596 * @return true if the animation is played, false otherwise 9597 * 9598 * @see #awakenScrollBars(int) 9599 * @see #scrollBy(int, int) 9600 * @see #scrollTo(int, int) 9601 * @see #isHorizontalScrollBarEnabled() 9602 * @see #isVerticalScrollBarEnabled() 9603 * @see #setHorizontalScrollBarEnabled(boolean) 9604 * @see #setVerticalScrollBarEnabled(boolean) 9605 */ 9606 protected boolean awakenScrollBars() { 9607 return mScrollCache != null && 9608 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9609 } 9610 9611 /** 9612 * Trigger the scrollbars to draw. 9613 * This method differs from awakenScrollBars() only in its default duration. 9614 * initialAwakenScrollBars() will show the scroll bars for longer than 9615 * usual to give the user more of a chance to notice them. 9616 * 9617 * @return true if the animation is played, false otherwise. 9618 */ 9619 private boolean initialAwakenScrollBars() { 9620 return mScrollCache != null && 9621 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9622 } 9623 9624 /** 9625 * <p> 9626 * Trigger the scrollbars to draw. When invoked this method starts an 9627 * animation to fade the scrollbars out after a fixed delay. If a subclass 9628 * provides animated scrolling, the start delay should equal the duration of 9629 * the scrolling animation. 9630 * </p> 9631 * 9632 * <p> 9633 * The animation starts only if at least one of the scrollbars is enabled, 9634 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9635 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9636 * this method returns true, and false otherwise. If the animation is 9637 * started, this method calls {@link #invalidate()}; in that case the caller 9638 * should not call {@link #invalidate()}. 9639 * </p> 9640 * 9641 * <p> 9642 * This method should be invoked everytime a subclass directly updates the 9643 * scroll parameters. 9644 * </p> 9645 * 9646 * @param startDelay the delay, in milliseconds, after which the animation 9647 * should start; when the delay is 0, the animation starts 9648 * immediately 9649 * @return true if the animation is played, false otherwise 9650 * 9651 * @see #scrollBy(int, int) 9652 * @see #scrollTo(int, int) 9653 * @see #isHorizontalScrollBarEnabled() 9654 * @see #isVerticalScrollBarEnabled() 9655 * @see #setHorizontalScrollBarEnabled(boolean) 9656 * @see #setVerticalScrollBarEnabled(boolean) 9657 */ 9658 protected boolean awakenScrollBars(int startDelay) { 9659 return awakenScrollBars(startDelay, true); 9660 } 9661 9662 /** 9663 * <p> 9664 * Trigger the scrollbars to draw. When invoked this method starts an 9665 * animation to fade the scrollbars out after a fixed delay. If a subclass 9666 * provides animated scrolling, the start delay should equal the duration of 9667 * the scrolling animation. 9668 * </p> 9669 * 9670 * <p> 9671 * The animation starts only if at least one of the scrollbars is enabled, 9672 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9673 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9674 * this method returns true, and false otherwise. If the animation is 9675 * started, this method calls {@link #invalidate()} if the invalidate parameter 9676 * is set to true; in that case the caller 9677 * should not call {@link #invalidate()}. 9678 * </p> 9679 * 9680 * <p> 9681 * This method should be invoked everytime a subclass directly updates the 9682 * scroll parameters. 9683 * </p> 9684 * 9685 * @param startDelay the delay, in milliseconds, after which the animation 9686 * should start; when the delay is 0, the animation starts 9687 * immediately 9688 * 9689 * @param invalidate Wheter this method should call invalidate 9690 * 9691 * @return true if the animation is played, false otherwise 9692 * 9693 * @see #scrollBy(int, int) 9694 * @see #scrollTo(int, int) 9695 * @see #isHorizontalScrollBarEnabled() 9696 * @see #isVerticalScrollBarEnabled() 9697 * @see #setHorizontalScrollBarEnabled(boolean) 9698 * @see #setVerticalScrollBarEnabled(boolean) 9699 */ 9700 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9701 final ScrollabilityCache scrollCache = mScrollCache; 9702 9703 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9704 return false; 9705 } 9706 9707 if (scrollCache.scrollBar == null) { 9708 scrollCache.scrollBar = new ScrollBarDrawable(); 9709 } 9710 9711 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9712 9713 if (invalidate) { 9714 // Invalidate to show the scrollbars 9715 postInvalidateOnAnimation(); 9716 } 9717 9718 if (scrollCache.state == ScrollabilityCache.OFF) { 9719 // FIXME: this is copied from WindowManagerService. 9720 // We should get this value from the system when it 9721 // is possible to do so. 9722 final int KEY_REPEAT_FIRST_DELAY = 750; 9723 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9724 } 9725 9726 // Tell mScrollCache when we should start fading. This may 9727 // extend the fade start time if one was already scheduled 9728 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9729 scrollCache.fadeStartTime = fadeStartTime; 9730 scrollCache.state = ScrollabilityCache.ON; 9731 9732 // Schedule our fader to run, unscheduling any old ones first 9733 if (mAttachInfo != null) { 9734 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9735 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9736 } 9737 9738 return true; 9739 } 9740 9741 return false; 9742 } 9743 9744 /** 9745 * Do not invalidate views which are not visible and which are not running an animation. They 9746 * will not get drawn and they should not set dirty flags as if they will be drawn 9747 */ 9748 private boolean skipInvalidate() { 9749 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9750 (!(mParent instanceof ViewGroup) || 9751 !((ViewGroup) mParent).isViewTransitioning(this)); 9752 } 9753 /** 9754 * Mark the area defined by dirty as needing to be drawn. If the view is 9755 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9756 * in the future. This must be called from a UI thread. To call from a non-UI 9757 * thread, call {@link #postInvalidate()}. 9758 * 9759 * WARNING: This method is destructive to dirty. 9760 * @param dirty the rectangle representing the bounds of the dirty region 9761 */ 9762 public void invalidate(Rect dirty) { 9763 if (ViewDebug.TRACE_HIERARCHY) { 9764 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9765 } 9766 9767 if (skipInvalidate()) { 9768 return; 9769 } 9770 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9771 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9772 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9773 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9774 mPrivateFlags |= INVALIDATED; 9775 mPrivateFlags |= DIRTY; 9776 final ViewParent p = mParent; 9777 final AttachInfo ai = mAttachInfo; 9778 //noinspection PointlessBooleanExpression,ConstantConditions 9779 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9780 if (p != null && ai != null && ai.mHardwareAccelerated) { 9781 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9782 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9783 p.invalidateChild(this, null); 9784 return; 9785 } 9786 } 9787 if (p != null && ai != null) { 9788 final int scrollX = mScrollX; 9789 final int scrollY = mScrollY; 9790 final Rect r = ai.mTmpInvalRect; 9791 r.set(dirty.left - scrollX, dirty.top - scrollY, 9792 dirty.right - scrollX, dirty.bottom - scrollY); 9793 mParent.invalidateChild(this, r); 9794 } 9795 } 9796 } 9797 9798 /** 9799 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9800 * The coordinates of the dirty rect are relative to the view. 9801 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9802 * will be called at some point in the future. This must be called from 9803 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9804 * @param l the left position of the dirty region 9805 * @param t the top position of the dirty region 9806 * @param r the right position of the dirty region 9807 * @param b the bottom position of the dirty region 9808 */ 9809 public void invalidate(int l, int t, int r, int b) { 9810 if (ViewDebug.TRACE_HIERARCHY) { 9811 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9812 } 9813 9814 if (skipInvalidate()) { 9815 return; 9816 } 9817 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9818 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9819 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9820 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9821 mPrivateFlags |= INVALIDATED; 9822 mPrivateFlags |= DIRTY; 9823 final ViewParent p = mParent; 9824 final AttachInfo ai = mAttachInfo; 9825 //noinspection PointlessBooleanExpression,ConstantConditions 9826 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9827 if (p != null && ai != null && ai.mHardwareAccelerated) { 9828 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9829 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9830 p.invalidateChild(this, null); 9831 return; 9832 } 9833 } 9834 if (p != null && ai != null && l < r && t < b) { 9835 final int scrollX = mScrollX; 9836 final int scrollY = mScrollY; 9837 final Rect tmpr = ai.mTmpInvalRect; 9838 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9839 p.invalidateChild(this, tmpr); 9840 } 9841 } 9842 } 9843 9844 /** 9845 * Invalidate the whole view. If the view is visible, 9846 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9847 * the future. This must be called from a UI thread. To call from a non-UI thread, 9848 * call {@link #postInvalidate()}. 9849 */ 9850 public void invalidate() { 9851 invalidate(true); 9852 } 9853 9854 /** 9855 * This is where the invalidate() work actually happens. A full invalidate() 9856 * causes the drawing cache to be invalidated, but this function can be called with 9857 * invalidateCache set to false to skip that invalidation step for cases that do not 9858 * need it (for example, a component that remains at the same dimensions with the same 9859 * content). 9860 * 9861 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9862 * well. This is usually true for a full invalidate, but may be set to false if the 9863 * View's contents or dimensions have not changed. 9864 */ 9865 void invalidate(boolean invalidateCache) { 9866 if (ViewDebug.TRACE_HIERARCHY) { 9867 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9868 } 9869 9870 if (skipInvalidate()) { 9871 return; 9872 } 9873 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9874 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 9875 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 9876 mLastIsOpaque = isOpaque(); 9877 mPrivateFlags &= ~DRAWN; 9878 mPrivateFlags |= DIRTY; 9879 if (invalidateCache) { 9880 mPrivateFlags |= INVALIDATED; 9881 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9882 } 9883 final AttachInfo ai = mAttachInfo; 9884 final ViewParent p = mParent; 9885 //noinspection PointlessBooleanExpression,ConstantConditions 9886 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9887 if (p != null && ai != null && ai.mHardwareAccelerated) { 9888 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9889 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9890 p.invalidateChild(this, null); 9891 return; 9892 } 9893 } 9894 9895 if (p != null && ai != null) { 9896 final Rect r = ai.mTmpInvalRect; 9897 r.set(0, 0, mRight - mLeft, mBottom - mTop); 9898 // Don't call invalidate -- we don't want to internally scroll 9899 // our own bounds 9900 p.invalidateChild(this, r); 9901 } 9902 } 9903 } 9904 9905 /** 9906 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 9907 * set any flags or handle all of the cases handled by the default invalidation methods. 9908 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 9909 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 9910 * walk up the hierarchy, transforming the dirty rect as necessary. 9911 * 9912 * The method also handles normal invalidation logic if display list properties are not 9913 * being used in this view. The invalidateParent and forceRedraw flags are used by that 9914 * backup approach, to handle these cases used in the various property-setting methods. 9915 * 9916 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 9917 * are not being used in this view 9918 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 9919 * list properties are not being used in this view 9920 */ 9921 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 9922 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 9923 if (invalidateParent) { 9924 invalidateParentCaches(); 9925 } 9926 if (forceRedraw) { 9927 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9928 } 9929 invalidate(false); 9930 } else { 9931 final AttachInfo ai = mAttachInfo; 9932 final ViewParent p = mParent; 9933 if (p != null && ai != null) { 9934 final Rect r = ai.mTmpInvalRect; 9935 r.set(0, 0, mRight - mLeft, mBottom - mTop); 9936 if (mParent instanceof ViewGroup) { 9937 ((ViewGroup) mParent).invalidateChildFast(this, r); 9938 } else { 9939 mParent.invalidateChild(this, r); 9940 } 9941 } 9942 } 9943 } 9944 9945 /** 9946 * Utility method to transform a given Rect by the current matrix of this view. 9947 */ 9948 void transformRect(final Rect rect) { 9949 if (!getMatrix().isIdentity()) { 9950 RectF boundingRect = mAttachInfo.mTmpTransformRect; 9951 boundingRect.set(rect); 9952 getMatrix().mapRect(boundingRect); 9953 rect.set((int) (boundingRect.left - 0.5f), 9954 (int) (boundingRect.top - 0.5f), 9955 (int) (boundingRect.right + 0.5f), 9956 (int) (boundingRect.bottom + 0.5f)); 9957 } 9958 } 9959 9960 /** 9961 * Used to indicate that the parent of this view should clear its caches. This functionality 9962 * is used to force the parent to rebuild its display list (when hardware-accelerated), 9963 * which is necessary when various parent-managed properties of the view change, such as 9964 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 9965 * clears the parent caches and does not causes an invalidate event. 9966 * 9967 * @hide 9968 */ 9969 protected void invalidateParentCaches() { 9970 if (mParent instanceof View) { 9971 ((View) mParent).mPrivateFlags |= INVALIDATED; 9972 } 9973 } 9974 9975 /** 9976 * Used to indicate that the parent of this view should be invalidated. This functionality 9977 * is used to force the parent to rebuild its display list (when hardware-accelerated), 9978 * which is necessary when various parent-managed properties of the view change, such as 9979 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 9980 * an invalidation event to the parent. 9981 * 9982 * @hide 9983 */ 9984 protected void invalidateParentIfNeeded() { 9985 if (isHardwareAccelerated() && mParent instanceof View) { 9986 ((View) mParent).invalidate(true); 9987 } 9988 } 9989 9990 /** 9991 * Indicates whether this View is opaque. An opaque View guarantees that it will 9992 * draw all the pixels overlapping its bounds using a fully opaque color. 9993 * 9994 * Subclasses of View should override this method whenever possible to indicate 9995 * whether an instance is opaque. Opaque Views are treated in a special way by 9996 * the View hierarchy, possibly allowing it to perform optimizations during 9997 * invalidate/draw passes. 9998 * 9999 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10000 */ 10001 @ViewDebug.ExportedProperty(category = "drawing") 10002 public boolean isOpaque() { 10003 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 10004 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 10005 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 10006 } 10007 10008 /** 10009 * @hide 10010 */ 10011 protected void computeOpaqueFlags() { 10012 // Opaque if: 10013 // - Has a background 10014 // - Background is opaque 10015 // - Doesn't have scrollbars or scrollbars are inside overlay 10016 10017 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10018 mPrivateFlags |= OPAQUE_BACKGROUND; 10019 } else { 10020 mPrivateFlags &= ~OPAQUE_BACKGROUND; 10021 } 10022 10023 final int flags = mViewFlags; 10024 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10025 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10026 mPrivateFlags |= OPAQUE_SCROLLBARS; 10027 } else { 10028 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 10029 } 10030 } 10031 10032 /** 10033 * @hide 10034 */ 10035 protected boolean hasOpaqueScrollbars() { 10036 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 10037 } 10038 10039 /** 10040 * @return A handler associated with the thread running the View. This 10041 * handler can be used to pump events in the UI events queue. 10042 */ 10043 public Handler getHandler() { 10044 if (mAttachInfo != null) { 10045 return mAttachInfo.mHandler; 10046 } 10047 return null; 10048 } 10049 10050 /** 10051 * Gets the view root associated with the View. 10052 * @return The view root, or null if none. 10053 * @hide 10054 */ 10055 public ViewRootImpl getViewRootImpl() { 10056 if (mAttachInfo != null) { 10057 return mAttachInfo.mViewRootImpl; 10058 } 10059 return null; 10060 } 10061 10062 /** 10063 * <p>Causes the Runnable to be added to the message queue. 10064 * The runnable will be run on the user interface thread.</p> 10065 * 10066 * <p>This method can be invoked from outside of the UI thread 10067 * only when this View is attached to a window.</p> 10068 * 10069 * @param action The Runnable that will be executed. 10070 * 10071 * @return Returns true if the Runnable was successfully placed in to the 10072 * message queue. Returns false on failure, usually because the 10073 * looper processing the message queue is exiting. 10074 * 10075 * @see #postDelayed 10076 * @see #removeCallbacks 10077 */ 10078 public boolean post(Runnable action) { 10079 final AttachInfo attachInfo = mAttachInfo; 10080 if (attachInfo != null) { 10081 return attachInfo.mHandler.post(action); 10082 } 10083 // Assume that post will succeed later 10084 ViewRootImpl.getRunQueue().post(action); 10085 return true; 10086 } 10087 10088 /** 10089 * <p>Causes the Runnable to be added to the message queue, to be run 10090 * after the specified amount of time elapses. 10091 * The runnable will be run on the user interface thread.</p> 10092 * 10093 * <p>This method can be invoked from outside of the UI thread 10094 * only when this View is attached to a window.</p> 10095 * 10096 * @param action The Runnable that will be executed. 10097 * @param delayMillis The delay (in milliseconds) until the Runnable 10098 * will be executed. 10099 * 10100 * @return true if the Runnable was successfully placed in to the 10101 * message queue. Returns false on failure, usually because the 10102 * looper processing the message queue is exiting. Note that a 10103 * result of true does not mean the Runnable will be processed -- 10104 * if the looper is quit before the delivery time of the message 10105 * occurs then the message will be dropped. 10106 * 10107 * @see #post 10108 * @see #removeCallbacks 10109 */ 10110 public boolean postDelayed(Runnable action, long delayMillis) { 10111 final AttachInfo attachInfo = mAttachInfo; 10112 if (attachInfo != null) { 10113 return attachInfo.mHandler.postDelayed(action, delayMillis); 10114 } 10115 // Assume that post will succeed later 10116 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10117 return true; 10118 } 10119 10120 /** 10121 * <p>Causes the Runnable to execute on the next animation time step. 10122 * The runnable will be run on the user interface thread.</p> 10123 * 10124 * <p>This method can be invoked from outside of the UI thread 10125 * only when this View is attached to a window.</p> 10126 * 10127 * @param action The Runnable that will be executed. 10128 * 10129 * @see #postOnAnimationDelayed 10130 * @see #removeCallbacks 10131 */ 10132 public void postOnAnimation(Runnable action) { 10133 final AttachInfo attachInfo = mAttachInfo; 10134 if (attachInfo != null) { 10135 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10136 Choreographer.CALLBACK_ANIMATION, action, null); 10137 } else { 10138 // Assume that post will succeed later 10139 ViewRootImpl.getRunQueue().post(action); 10140 } 10141 } 10142 10143 /** 10144 * <p>Causes the Runnable to execute on the next animation time step, 10145 * after the specified amount of time elapses. 10146 * The runnable will be run on the user interface thread.</p> 10147 * 10148 * <p>This method can be invoked from outside of the UI thread 10149 * only when this View is attached to a window.</p> 10150 * 10151 * @param action The Runnable that will be executed. 10152 * @param delayMillis The delay (in milliseconds) until the Runnable 10153 * will be executed. 10154 * 10155 * @see #postOnAnimation 10156 * @see #removeCallbacks 10157 */ 10158 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10159 final AttachInfo attachInfo = mAttachInfo; 10160 if (attachInfo != null) { 10161 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10162 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10163 } else { 10164 // Assume that post will succeed later 10165 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10166 } 10167 } 10168 10169 /** 10170 * <p>Removes the specified Runnable from the message queue.</p> 10171 * 10172 * <p>This method can be invoked from outside of the UI thread 10173 * only when this View is attached to a window.</p> 10174 * 10175 * @param action The Runnable to remove from the message handling queue 10176 * 10177 * @return true if this view could ask the Handler to remove the Runnable, 10178 * false otherwise. When the returned value is true, the Runnable 10179 * may or may not have been actually removed from the message queue 10180 * (for instance, if the Runnable was not in the queue already.) 10181 * 10182 * @see #post 10183 * @see #postDelayed 10184 * @see #postOnAnimation 10185 * @see #postOnAnimationDelayed 10186 */ 10187 public boolean removeCallbacks(Runnable action) { 10188 if (action != null) { 10189 final AttachInfo attachInfo = mAttachInfo; 10190 if (attachInfo != null) { 10191 attachInfo.mHandler.removeCallbacks(action); 10192 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10193 Choreographer.CALLBACK_ANIMATION, action, null); 10194 } else { 10195 // Assume that post will succeed later 10196 ViewRootImpl.getRunQueue().removeCallbacks(action); 10197 } 10198 } 10199 return true; 10200 } 10201 10202 /** 10203 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10204 * Use this to invalidate the View from a non-UI thread.</p> 10205 * 10206 * <p>This method can be invoked from outside of the UI thread 10207 * only when this View is attached to a window.</p> 10208 * 10209 * @see #invalidate() 10210 * @see #postInvalidateDelayed(long) 10211 */ 10212 public void postInvalidate() { 10213 postInvalidateDelayed(0); 10214 } 10215 10216 /** 10217 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10218 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10219 * 10220 * <p>This method can be invoked from outside of the UI thread 10221 * only when this View is attached to a window.</p> 10222 * 10223 * @param left The left coordinate of the rectangle to invalidate. 10224 * @param top The top coordinate of the rectangle to invalidate. 10225 * @param right The right coordinate of the rectangle to invalidate. 10226 * @param bottom The bottom coordinate of the rectangle to invalidate. 10227 * 10228 * @see #invalidate(int, int, int, int) 10229 * @see #invalidate(Rect) 10230 * @see #postInvalidateDelayed(long, int, int, int, int) 10231 */ 10232 public void postInvalidate(int left, int top, int right, int bottom) { 10233 postInvalidateDelayed(0, left, top, right, bottom); 10234 } 10235 10236 /** 10237 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10238 * loop. Waits for the specified amount of time.</p> 10239 * 10240 * <p>This method can be invoked from outside of the UI thread 10241 * only when this View is attached to a window.</p> 10242 * 10243 * @param delayMilliseconds the duration in milliseconds to delay the 10244 * invalidation by 10245 * 10246 * @see #invalidate() 10247 * @see #postInvalidate() 10248 */ 10249 public void postInvalidateDelayed(long delayMilliseconds) { 10250 // We try only with the AttachInfo because there's no point in invalidating 10251 // if we are not attached to our window 10252 final AttachInfo attachInfo = mAttachInfo; 10253 if (attachInfo != null) { 10254 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10255 } 10256 } 10257 10258 /** 10259 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10260 * through the event loop. Waits for the specified amount of time.</p> 10261 * 10262 * <p>This method can be invoked from outside of the UI thread 10263 * only when this View is attached to a window.</p> 10264 * 10265 * @param delayMilliseconds the duration in milliseconds to delay the 10266 * invalidation by 10267 * @param left The left coordinate of the rectangle to invalidate. 10268 * @param top The top coordinate of the rectangle to invalidate. 10269 * @param right The right coordinate of the rectangle to invalidate. 10270 * @param bottom The bottom coordinate of the rectangle to invalidate. 10271 * 10272 * @see #invalidate(int, int, int, int) 10273 * @see #invalidate(Rect) 10274 * @see #postInvalidate(int, int, int, int) 10275 */ 10276 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10277 int right, int bottom) { 10278 10279 // We try only with the AttachInfo because there's no point in invalidating 10280 // if we are not attached to our window 10281 final AttachInfo attachInfo = mAttachInfo; 10282 if (attachInfo != null) { 10283 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10284 info.target = this; 10285 info.left = left; 10286 info.top = top; 10287 info.right = right; 10288 info.bottom = bottom; 10289 10290 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10291 } 10292 } 10293 10294 /** 10295 * <p>Cause an invalidate to happen on the next animation time step, typically the 10296 * next display frame.</p> 10297 * 10298 * <p>This method can be invoked from outside of the UI thread 10299 * only when this View is attached to a window.</p> 10300 * 10301 * @see #invalidate() 10302 */ 10303 public void postInvalidateOnAnimation() { 10304 // We try only with the AttachInfo because there's no point in invalidating 10305 // if we are not attached to our window 10306 final AttachInfo attachInfo = mAttachInfo; 10307 if (attachInfo != null) { 10308 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10309 } 10310 } 10311 10312 /** 10313 * <p>Cause an invalidate of the specified area to happen on the next animation 10314 * time step, typically the next display frame.</p> 10315 * 10316 * <p>This method can be invoked from outside of the UI thread 10317 * only when this View is attached to a window.</p> 10318 * 10319 * @param left The left coordinate of the rectangle to invalidate. 10320 * @param top The top coordinate of the rectangle to invalidate. 10321 * @param right The right coordinate of the rectangle to invalidate. 10322 * @param bottom The bottom coordinate of the rectangle to invalidate. 10323 * 10324 * @see #invalidate(int, int, int, int) 10325 * @see #invalidate(Rect) 10326 */ 10327 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10328 // We try only with the AttachInfo because there's no point in invalidating 10329 // if we are not attached to our window 10330 final AttachInfo attachInfo = mAttachInfo; 10331 if (attachInfo != null) { 10332 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10333 info.target = this; 10334 info.left = left; 10335 info.top = top; 10336 info.right = right; 10337 info.bottom = bottom; 10338 10339 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10340 } 10341 } 10342 10343 /** 10344 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10345 * This event is sent at most once every 10346 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10347 */ 10348 private void postSendViewScrolledAccessibilityEventCallback() { 10349 if (mSendViewScrolledAccessibilityEvent == null) { 10350 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10351 } 10352 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10353 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10354 postDelayed(mSendViewScrolledAccessibilityEvent, 10355 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10356 } 10357 } 10358 10359 /** 10360 * Called by a parent to request that a child update its values for mScrollX 10361 * and mScrollY if necessary. This will typically be done if the child is 10362 * animating a scroll using a {@link android.widget.Scroller Scroller} 10363 * object. 10364 */ 10365 public void computeScroll() { 10366 } 10367 10368 /** 10369 * <p>Indicate whether the horizontal edges are faded when the view is 10370 * scrolled horizontally.</p> 10371 * 10372 * @return true if the horizontal edges should are faded on scroll, false 10373 * otherwise 10374 * 10375 * @see #setHorizontalFadingEdgeEnabled(boolean) 10376 * 10377 * @attr ref android.R.styleable#View_requiresFadingEdge 10378 */ 10379 public boolean isHorizontalFadingEdgeEnabled() { 10380 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10381 } 10382 10383 /** 10384 * <p>Define whether the horizontal edges should be faded when this view 10385 * is scrolled horizontally.</p> 10386 * 10387 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10388 * be faded when the view is scrolled 10389 * horizontally 10390 * 10391 * @see #isHorizontalFadingEdgeEnabled() 10392 * 10393 * @attr ref android.R.styleable#View_requiresFadingEdge 10394 */ 10395 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10396 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10397 if (horizontalFadingEdgeEnabled) { 10398 initScrollCache(); 10399 } 10400 10401 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10402 } 10403 } 10404 10405 /** 10406 * <p>Indicate whether the vertical edges are faded when the view is 10407 * scrolled horizontally.</p> 10408 * 10409 * @return true if the vertical edges should are faded on scroll, false 10410 * otherwise 10411 * 10412 * @see #setVerticalFadingEdgeEnabled(boolean) 10413 * 10414 * @attr ref android.R.styleable#View_requiresFadingEdge 10415 */ 10416 public boolean isVerticalFadingEdgeEnabled() { 10417 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10418 } 10419 10420 /** 10421 * <p>Define whether the vertical edges should be faded when this view 10422 * is scrolled vertically.</p> 10423 * 10424 * @param verticalFadingEdgeEnabled true if the vertical edges should 10425 * be faded when the view is scrolled 10426 * vertically 10427 * 10428 * @see #isVerticalFadingEdgeEnabled() 10429 * 10430 * @attr ref android.R.styleable#View_requiresFadingEdge 10431 */ 10432 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10433 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10434 if (verticalFadingEdgeEnabled) { 10435 initScrollCache(); 10436 } 10437 10438 mViewFlags ^= FADING_EDGE_VERTICAL; 10439 } 10440 } 10441 10442 /** 10443 * Returns the strength, or intensity, of the top faded edge. The strength is 10444 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10445 * returns 0.0 or 1.0 but no value in between. 10446 * 10447 * Subclasses should override this method to provide a smoother fade transition 10448 * when scrolling occurs. 10449 * 10450 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10451 */ 10452 protected float getTopFadingEdgeStrength() { 10453 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10454 } 10455 10456 /** 10457 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10458 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10459 * returns 0.0 or 1.0 but no value in between. 10460 * 10461 * Subclasses should override this method to provide a smoother fade transition 10462 * when scrolling occurs. 10463 * 10464 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10465 */ 10466 protected float getBottomFadingEdgeStrength() { 10467 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10468 computeVerticalScrollRange() ? 1.0f : 0.0f; 10469 } 10470 10471 /** 10472 * Returns the strength, or intensity, of the left faded edge. The strength is 10473 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10474 * returns 0.0 or 1.0 but no value in between. 10475 * 10476 * Subclasses should override this method to provide a smoother fade transition 10477 * when scrolling occurs. 10478 * 10479 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10480 */ 10481 protected float getLeftFadingEdgeStrength() { 10482 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10483 } 10484 10485 /** 10486 * Returns the strength, or intensity, of the right faded edge. The strength is 10487 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10488 * returns 0.0 or 1.0 but no value in between. 10489 * 10490 * Subclasses should override this method to provide a smoother fade transition 10491 * when scrolling occurs. 10492 * 10493 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10494 */ 10495 protected float getRightFadingEdgeStrength() { 10496 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10497 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10498 } 10499 10500 /** 10501 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10502 * scrollbar is not drawn by default.</p> 10503 * 10504 * @return true if the horizontal scrollbar should be painted, false 10505 * otherwise 10506 * 10507 * @see #setHorizontalScrollBarEnabled(boolean) 10508 */ 10509 public boolean isHorizontalScrollBarEnabled() { 10510 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10511 } 10512 10513 /** 10514 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10515 * scrollbar is not drawn by default.</p> 10516 * 10517 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10518 * be painted 10519 * 10520 * @see #isHorizontalScrollBarEnabled() 10521 */ 10522 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10523 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10524 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10525 computeOpaqueFlags(); 10526 resolvePadding(); 10527 } 10528 } 10529 10530 /** 10531 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10532 * scrollbar is not drawn by default.</p> 10533 * 10534 * @return true if the vertical scrollbar should be painted, false 10535 * otherwise 10536 * 10537 * @see #setVerticalScrollBarEnabled(boolean) 10538 */ 10539 public boolean isVerticalScrollBarEnabled() { 10540 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10541 } 10542 10543 /** 10544 * <p>Define whether the vertical scrollbar should be drawn or not. The 10545 * scrollbar is not drawn by default.</p> 10546 * 10547 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10548 * be painted 10549 * 10550 * @see #isVerticalScrollBarEnabled() 10551 */ 10552 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10553 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10554 mViewFlags ^= SCROLLBARS_VERTICAL; 10555 computeOpaqueFlags(); 10556 resolvePadding(); 10557 } 10558 } 10559 10560 /** 10561 * @hide 10562 */ 10563 protected void recomputePadding() { 10564 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10565 } 10566 10567 /** 10568 * Define whether scrollbars will fade when the view is not scrolling. 10569 * 10570 * @param fadeScrollbars wheter to enable fading 10571 * 10572 * @attr ref android.R.styleable#View_fadeScrollbars 10573 */ 10574 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10575 initScrollCache(); 10576 final ScrollabilityCache scrollabilityCache = mScrollCache; 10577 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10578 if (fadeScrollbars) { 10579 scrollabilityCache.state = ScrollabilityCache.OFF; 10580 } else { 10581 scrollabilityCache.state = ScrollabilityCache.ON; 10582 } 10583 } 10584 10585 /** 10586 * 10587 * Returns true if scrollbars will fade when this view is not scrolling 10588 * 10589 * @return true if scrollbar fading is enabled 10590 * 10591 * @attr ref android.R.styleable#View_fadeScrollbars 10592 */ 10593 public boolean isScrollbarFadingEnabled() { 10594 return mScrollCache != null && mScrollCache.fadeScrollBars; 10595 } 10596 10597 /** 10598 * 10599 * Returns the delay before scrollbars fade. 10600 * 10601 * @return the delay before scrollbars fade 10602 * 10603 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10604 */ 10605 public int getScrollBarDefaultDelayBeforeFade() { 10606 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10607 mScrollCache.scrollBarDefaultDelayBeforeFade; 10608 } 10609 10610 /** 10611 * Define the delay before scrollbars fade. 10612 * 10613 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10614 * 10615 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10616 */ 10617 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10618 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10619 } 10620 10621 /** 10622 * 10623 * Returns the scrollbar fade duration. 10624 * 10625 * @return the scrollbar fade duration 10626 * 10627 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10628 */ 10629 public int getScrollBarFadeDuration() { 10630 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10631 mScrollCache.scrollBarFadeDuration; 10632 } 10633 10634 /** 10635 * Define the scrollbar fade duration. 10636 * 10637 * @param scrollBarFadeDuration - the scrollbar fade duration 10638 * 10639 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10640 */ 10641 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10642 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10643 } 10644 10645 /** 10646 * 10647 * Returns the scrollbar size. 10648 * 10649 * @return the scrollbar size 10650 * 10651 * @attr ref android.R.styleable#View_scrollbarSize 10652 */ 10653 public int getScrollBarSize() { 10654 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10655 mScrollCache.scrollBarSize; 10656 } 10657 10658 /** 10659 * Define the scrollbar size. 10660 * 10661 * @param scrollBarSize - the scrollbar size 10662 * 10663 * @attr ref android.R.styleable#View_scrollbarSize 10664 */ 10665 public void setScrollBarSize(int scrollBarSize) { 10666 getScrollCache().scrollBarSize = scrollBarSize; 10667 } 10668 10669 /** 10670 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10671 * inset. When inset, they add to the padding of the view. And the scrollbars 10672 * can be drawn inside the padding area or on the edge of the view. For example, 10673 * if a view has a background drawable and you want to draw the scrollbars 10674 * inside the padding specified by the drawable, you can use 10675 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10676 * appear at the edge of the view, ignoring the padding, then you can use 10677 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10678 * @param style the style of the scrollbars. Should be one of 10679 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10680 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10681 * @see #SCROLLBARS_INSIDE_OVERLAY 10682 * @see #SCROLLBARS_INSIDE_INSET 10683 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10684 * @see #SCROLLBARS_OUTSIDE_INSET 10685 * 10686 * @attr ref android.R.styleable#View_scrollbarStyle 10687 */ 10688 public void setScrollBarStyle(int style) { 10689 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10690 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10691 computeOpaqueFlags(); 10692 resolvePadding(); 10693 } 10694 } 10695 10696 /** 10697 * <p>Returns the current scrollbar style.</p> 10698 * @return the current scrollbar style 10699 * @see #SCROLLBARS_INSIDE_OVERLAY 10700 * @see #SCROLLBARS_INSIDE_INSET 10701 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10702 * @see #SCROLLBARS_OUTSIDE_INSET 10703 * 10704 * @attr ref android.R.styleable#View_scrollbarStyle 10705 */ 10706 @ViewDebug.ExportedProperty(mapping = { 10707 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10708 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10709 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10710 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10711 }) 10712 public int getScrollBarStyle() { 10713 return mViewFlags & SCROLLBARS_STYLE_MASK; 10714 } 10715 10716 /** 10717 * <p>Compute the horizontal range that the horizontal scrollbar 10718 * represents.</p> 10719 * 10720 * <p>The range is expressed in arbitrary units that must be the same as the 10721 * units used by {@link #computeHorizontalScrollExtent()} and 10722 * {@link #computeHorizontalScrollOffset()}.</p> 10723 * 10724 * <p>The default range is the drawing width of this view.</p> 10725 * 10726 * @return the total horizontal range represented by the horizontal 10727 * scrollbar 10728 * 10729 * @see #computeHorizontalScrollExtent() 10730 * @see #computeHorizontalScrollOffset() 10731 * @see android.widget.ScrollBarDrawable 10732 */ 10733 protected int computeHorizontalScrollRange() { 10734 return getWidth(); 10735 } 10736 10737 /** 10738 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10739 * within the horizontal range. This value is used to compute the position 10740 * of the thumb within the scrollbar's track.</p> 10741 * 10742 * <p>The range is expressed in arbitrary units that must be the same as the 10743 * units used by {@link #computeHorizontalScrollRange()} and 10744 * {@link #computeHorizontalScrollExtent()}.</p> 10745 * 10746 * <p>The default offset is the scroll offset of this view.</p> 10747 * 10748 * @return the horizontal offset of the scrollbar's thumb 10749 * 10750 * @see #computeHorizontalScrollRange() 10751 * @see #computeHorizontalScrollExtent() 10752 * @see android.widget.ScrollBarDrawable 10753 */ 10754 protected int computeHorizontalScrollOffset() { 10755 return mScrollX; 10756 } 10757 10758 /** 10759 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10760 * within the horizontal range. This value is used to compute the length 10761 * of the thumb within the scrollbar's track.</p> 10762 * 10763 * <p>The range is expressed in arbitrary units that must be the same as the 10764 * units used by {@link #computeHorizontalScrollRange()} and 10765 * {@link #computeHorizontalScrollOffset()}.</p> 10766 * 10767 * <p>The default extent is the drawing width of this view.</p> 10768 * 10769 * @return the horizontal extent of the scrollbar's thumb 10770 * 10771 * @see #computeHorizontalScrollRange() 10772 * @see #computeHorizontalScrollOffset() 10773 * @see android.widget.ScrollBarDrawable 10774 */ 10775 protected int computeHorizontalScrollExtent() { 10776 return getWidth(); 10777 } 10778 10779 /** 10780 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10781 * 10782 * <p>The range is expressed in arbitrary units that must be the same as the 10783 * units used by {@link #computeVerticalScrollExtent()} and 10784 * {@link #computeVerticalScrollOffset()}.</p> 10785 * 10786 * @return the total vertical range represented by the vertical scrollbar 10787 * 10788 * <p>The default range is the drawing height of this view.</p> 10789 * 10790 * @see #computeVerticalScrollExtent() 10791 * @see #computeVerticalScrollOffset() 10792 * @see android.widget.ScrollBarDrawable 10793 */ 10794 protected int computeVerticalScrollRange() { 10795 return getHeight(); 10796 } 10797 10798 /** 10799 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10800 * within the horizontal range. This value is used to compute the position 10801 * of the thumb within the scrollbar's track.</p> 10802 * 10803 * <p>The range is expressed in arbitrary units that must be the same as the 10804 * units used by {@link #computeVerticalScrollRange()} and 10805 * {@link #computeVerticalScrollExtent()}.</p> 10806 * 10807 * <p>The default offset is the scroll offset of this view.</p> 10808 * 10809 * @return the vertical offset of the scrollbar's thumb 10810 * 10811 * @see #computeVerticalScrollRange() 10812 * @see #computeVerticalScrollExtent() 10813 * @see android.widget.ScrollBarDrawable 10814 */ 10815 protected int computeVerticalScrollOffset() { 10816 return mScrollY; 10817 } 10818 10819 /** 10820 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10821 * within the vertical range. This value is used to compute the length 10822 * of the thumb within the scrollbar's track.</p> 10823 * 10824 * <p>The range is expressed in arbitrary units that must be the same as the 10825 * units used by {@link #computeVerticalScrollRange()} and 10826 * {@link #computeVerticalScrollOffset()}.</p> 10827 * 10828 * <p>The default extent is the drawing height of this view.</p> 10829 * 10830 * @return the vertical extent of the scrollbar's thumb 10831 * 10832 * @see #computeVerticalScrollRange() 10833 * @see #computeVerticalScrollOffset() 10834 * @see android.widget.ScrollBarDrawable 10835 */ 10836 protected int computeVerticalScrollExtent() { 10837 return getHeight(); 10838 } 10839 10840 /** 10841 * Check if this view can be scrolled horizontally in a certain direction. 10842 * 10843 * @param direction Negative to check scrolling left, positive to check scrolling right. 10844 * @return true if this view can be scrolled in the specified direction, false otherwise. 10845 */ 10846 public boolean canScrollHorizontally(int direction) { 10847 final int offset = computeHorizontalScrollOffset(); 10848 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10849 if (range == 0) return false; 10850 if (direction < 0) { 10851 return offset > 0; 10852 } else { 10853 return offset < range - 1; 10854 } 10855 } 10856 10857 /** 10858 * Check if this view can be scrolled vertically in a certain direction. 10859 * 10860 * @param direction Negative to check scrolling up, positive to check scrolling down. 10861 * @return true if this view can be scrolled in the specified direction, false otherwise. 10862 */ 10863 public boolean canScrollVertically(int direction) { 10864 final int offset = computeVerticalScrollOffset(); 10865 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10866 if (range == 0) return false; 10867 if (direction < 0) { 10868 return offset > 0; 10869 } else { 10870 return offset < range - 1; 10871 } 10872 } 10873 10874 /** 10875 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 10876 * scrollbars are painted only if they have been awakened first.</p> 10877 * 10878 * @param canvas the canvas on which to draw the scrollbars 10879 * 10880 * @see #awakenScrollBars(int) 10881 */ 10882 protected final void onDrawScrollBars(Canvas canvas) { 10883 // scrollbars are drawn only when the animation is running 10884 final ScrollabilityCache cache = mScrollCache; 10885 if (cache != null) { 10886 10887 int state = cache.state; 10888 10889 if (state == ScrollabilityCache.OFF) { 10890 return; 10891 } 10892 10893 boolean invalidate = false; 10894 10895 if (state == ScrollabilityCache.FADING) { 10896 // We're fading -- get our fade interpolation 10897 if (cache.interpolatorValues == null) { 10898 cache.interpolatorValues = new float[1]; 10899 } 10900 10901 float[] values = cache.interpolatorValues; 10902 10903 // Stops the animation if we're done 10904 if (cache.scrollBarInterpolator.timeToValues(values) == 10905 Interpolator.Result.FREEZE_END) { 10906 cache.state = ScrollabilityCache.OFF; 10907 } else { 10908 cache.scrollBar.setAlpha(Math.round(values[0])); 10909 } 10910 10911 // This will make the scroll bars inval themselves after 10912 // drawing. We only want this when we're fading so that 10913 // we prevent excessive redraws 10914 invalidate = true; 10915 } else { 10916 // We're just on -- but we may have been fading before so 10917 // reset alpha 10918 cache.scrollBar.setAlpha(255); 10919 } 10920 10921 10922 final int viewFlags = mViewFlags; 10923 10924 final boolean drawHorizontalScrollBar = 10925 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10926 final boolean drawVerticalScrollBar = 10927 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 10928 && !isVerticalScrollBarHidden(); 10929 10930 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 10931 final int width = mRight - mLeft; 10932 final int height = mBottom - mTop; 10933 10934 final ScrollBarDrawable scrollBar = cache.scrollBar; 10935 10936 final int scrollX = mScrollX; 10937 final int scrollY = mScrollY; 10938 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 10939 10940 int left, top, right, bottom; 10941 10942 if (drawHorizontalScrollBar) { 10943 int size = scrollBar.getSize(false); 10944 if (size <= 0) { 10945 size = cache.scrollBarSize; 10946 } 10947 10948 scrollBar.setParameters(computeHorizontalScrollRange(), 10949 computeHorizontalScrollOffset(), 10950 computeHorizontalScrollExtent(), false); 10951 final int verticalScrollBarGap = drawVerticalScrollBar ? 10952 getVerticalScrollbarWidth() : 0; 10953 top = scrollY + height - size - (mUserPaddingBottom & inside); 10954 left = scrollX + (mPaddingLeft & inside); 10955 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 10956 bottom = top + size; 10957 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 10958 if (invalidate) { 10959 invalidate(left, top, right, bottom); 10960 } 10961 } 10962 10963 if (drawVerticalScrollBar) { 10964 int size = scrollBar.getSize(true); 10965 if (size <= 0) { 10966 size = cache.scrollBarSize; 10967 } 10968 10969 scrollBar.setParameters(computeVerticalScrollRange(), 10970 computeVerticalScrollOffset(), 10971 computeVerticalScrollExtent(), true); 10972 switch (mVerticalScrollbarPosition) { 10973 default: 10974 case SCROLLBAR_POSITION_DEFAULT: 10975 case SCROLLBAR_POSITION_RIGHT: 10976 left = scrollX + width - size - (mUserPaddingRight & inside); 10977 break; 10978 case SCROLLBAR_POSITION_LEFT: 10979 left = scrollX + (mUserPaddingLeft & inside); 10980 break; 10981 } 10982 top = scrollY + (mPaddingTop & inside); 10983 right = left + size; 10984 bottom = scrollY + height - (mUserPaddingBottom & inside); 10985 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 10986 if (invalidate) { 10987 invalidate(left, top, right, bottom); 10988 } 10989 } 10990 } 10991 } 10992 } 10993 10994 /** 10995 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 10996 * FastScroller is visible. 10997 * @return whether to temporarily hide the vertical scrollbar 10998 * @hide 10999 */ 11000 protected boolean isVerticalScrollBarHidden() { 11001 return false; 11002 } 11003 11004 /** 11005 * <p>Draw the horizontal scrollbar if 11006 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11007 * 11008 * @param canvas the canvas on which to draw the scrollbar 11009 * @param scrollBar the scrollbar's drawable 11010 * 11011 * @see #isHorizontalScrollBarEnabled() 11012 * @see #computeHorizontalScrollRange() 11013 * @see #computeHorizontalScrollExtent() 11014 * @see #computeHorizontalScrollOffset() 11015 * @see android.widget.ScrollBarDrawable 11016 * @hide 11017 */ 11018 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11019 int l, int t, int r, int b) { 11020 scrollBar.setBounds(l, t, r, b); 11021 scrollBar.draw(canvas); 11022 } 11023 11024 /** 11025 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11026 * returns true.</p> 11027 * 11028 * @param canvas the canvas on which to draw the scrollbar 11029 * @param scrollBar the scrollbar's drawable 11030 * 11031 * @see #isVerticalScrollBarEnabled() 11032 * @see #computeVerticalScrollRange() 11033 * @see #computeVerticalScrollExtent() 11034 * @see #computeVerticalScrollOffset() 11035 * @see android.widget.ScrollBarDrawable 11036 * @hide 11037 */ 11038 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11039 int l, int t, int r, int b) { 11040 scrollBar.setBounds(l, t, r, b); 11041 scrollBar.draw(canvas); 11042 } 11043 11044 /** 11045 * Implement this to do your drawing. 11046 * 11047 * @param canvas the canvas on which the background will be drawn 11048 */ 11049 protected void onDraw(Canvas canvas) { 11050 } 11051 11052 /* 11053 * Caller is responsible for calling requestLayout if necessary. 11054 * (This allows addViewInLayout to not request a new layout.) 11055 */ 11056 void assignParent(ViewParent parent) { 11057 if (mParent == null) { 11058 mParent = parent; 11059 } else if (parent == null) { 11060 mParent = null; 11061 } else { 11062 throw new RuntimeException("view " + this + " being added, but" 11063 + " it already has a parent"); 11064 } 11065 } 11066 11067 /** 11068 * This is called when the view is attached to a window. At this point it 11069 * has a Surface and will start drawing. Note that this function is 11070 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11071 * however it may be called any time before the first onDraw -- including 11072 * before or after {@link #onMeasure(int, int)}. 11073 * 11074 * @see #onDetachedFromWindow() 11075 */ 11076 protected void onAttachedToWindow() { 11077 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 11078 mParent.requestTransparentRegion(this); 11079 } 11080 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11081 initialAwakenScrollBars(); 11082 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 11083 } 11084 jumpDrawablesToCurrentState(); 11085 // Order is important here: LayoutDirection MUST be resolved before Padding 11086 // and TextDirection 11087 resolveLayoutDirection(); 11088 resolvePadding(); 11089 resolveTextDirection(); 11090 resolveTextAlignment(); 11091 clearAccessibilityFocus(); 11092 if (isFocused()) { 11093 InputMethodManager imm = InputMethodManager.peekInstance(); 11094 imm.focusIn(this); 11095 } 11096 } 11097 11098 /** 11099 * @see #onScreenStateChanged(int) 11100 */ 11101 void dispatchScreenStateChanged(int screenState) { 11102 onScreenStateChanged(screenState); 11103 } 11104 11105 /** 11106 * This method is called whenever the state of the screen this view is 11107 * attached to changes. A state change will usually occurs when the screen 11108 * turns on or off (whether it happens automatically or the user does it 11109 * manually.) 11110 * 11111 * @param screenState The new state of the screen. Can be either 11112 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11113 */ 11114 public void onScreenStateChanged(int screenState) { 11115 } 11116 11117 /** 11118 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11119 */ 11120 private boolean hasRtlSupport() { 11121 return mContext.getApplicationInfo().hasRtlSupport(); 11122 } 11123 11124 /** 11125 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11126 * that the parent directionality can and will be resolved before its children. 11127 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 11128 * @hide 11129 */ 11130 public void resolveLayoutDirection() { 11131 // Clear any previous layout direction resolution 11132 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11133 11134 if (hasRtlSupport()) { 11135 // Set resolved depending on layout direction 11136 switch (getLayoutDirection()) { 11137 case LAYOUT_DIRECTION_INHERIT: 11138 // If this is root view, no need to look at parent's layout dir. 11139 if (canResolveLayoutDirection()) { 11140 ViewGroup viewGroup = ((ViewGroup) mParent); 11141 11142 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11143 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11144 } 11145 } else { 11146 // Nothing to do, LTR by default 11147 } 11148 break; 11149 case LAYOUT_DIRECTION_RTL: 11150 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11151 break; 11152 case LAYOUT_DIRECTION_LOCALE: 11153 if(isLayoutDirectionRtl(Locale.getDefault())) { 11154 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11155 } 11156 break; 11157 default: 11158 // Nothing to do, LTR by default 11159 } 11160 } 11161 11162 // Set to resolved 11163 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 11164 onResolvedLayoutDirectionChanged(); 11165 // Resolve padding 11166 resolvePadding(); 11167 } 11168 11169 /** 11170 * Called when layout direction has been resolved. 11171 * 11172 * The default implementation does nothing. 11173 * @hide 11174 */ 11175 public void onResolvedLayoutDirectionChanged() { 11176 } 11177 11178 /** 11179 * Resolve padding depending on layout direction. 11180 * @hide 11181 */ 11182 public void resolvePadding() { 11183 // If the user specified the absolute padding (either with android:padding or 11184 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 11185 // use the default padding or the padding from the background drawable 11186 // (stored at this point in mPadding*) 11187 int resolvedLayoutDirection = getResolvedLayoutDirection(); 11188 switch (resolvedLayoutDirection) { 11189 case LAYOUT_DIRECTION_RTL: 11190 // Start user padding override Right user padding. Otherwise, if Right user 11191 // padding is not defined, use the default Right padding. If Right user padding 11192 // is defined, just use it. 11193 if (mUserPaddingStart >= 0) { 11194 mUserPaddingRight = mUserPaddingStart; 11195 } else if (mUserPaddingRight < 0) { 11196 mUserPaddingRight = mPaddingRight; 11197 } 11198 if (mUserPaddingEnd >= 0) { 11199 mUserPaddingLeft = mUserPaddingEnd; 11200 } else if (mUserPaddingLeft < 0) { 11201 mUserPaddingLeft = mPaddingLeft; 11202 } 11203 break; 11204 case LAYOUT_DIRECTION_LTR: 11205 default: 11206 // Start user padding override Left user padding. Otherwise, if Left user 11207 // padding is not defined, use the default left padding. If Left user padding 11208 // is defined, just use it. 11209 if (mUserPaddingStart >= 0) { 11210 mUserPaddingLeft = mUserPaddingStart; 11211 } else if (mUserPaddingLeft < 0) { 11212 mUserPaddingLeft = mPaddingLeft; 11213 } 11214 if (mUserPaddingEnd >= 0) { 11215 mUserPaddingRight = mUserPaddingEnd; 11216 } else if (mUserPaddingRight < 0) { 11217 mUserPaddingRight = mPaddingRight; 11218 } 11219 } 11220 11221 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11222 11223 if(isPaddingRelative()) { 11224 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11225 } else { 11226 recomputePadding(); 11227 } 11228 onPaddingChanged(resolvedLayoutDirection); 11229 } 11230 11231 /** 11232 * Resolve padding depending on the layout direction. Subclasses that care about 11233 * padding resolution should override this method. The default implementation does 11234 * nothing. 11235 * 11236 * @param layoutDirection the direction of the layout 11237 * 11238 * @see {@link #LAYOUT_DIRECTION_LTR} 11239 * @see {@link #LAYOUT_DIRECTION_RTL} 11240 * @hide 11241 */ 11242 public void onPaddingChanged(int layoutDirection) { 11243 } 11244 11245 /** 11246 * Check if layout direction resolution can be done. 11247 * 11248 * @return true if layout direction resolution can be done otherwise return false. 11249 * @hide 11250 */ 11251 public boolean canResolveLayoutDirection() { 11252 switch (getLayoutDirection()) { 11253 case LAYOUT_DIRECTION_INHERIT: 11254 return (mParent != null) && (mParent instanceof ViewGroup); 11255 default: 11256 return true; 11257 } 11258 } 11259 11260 /** 11261 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11262 * when reset is done. 11263 * @hide 11264 */ 11265 public void resetResolvedLayoutDirection() { 11266 // Reset the current resolved bits 11267 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11268 onResolvedLayoutDirectionReset(); 11269 // Reset also the text direction 11270 resetResolvedTextDirection(); 11271 } 11272 11273 /** 11274 * Called during reset of resolved layout direction. 11275 * 11276 * Subclasses need to override this method to clear cached information that depends on the 11277 * resolved layout direction, or to inform child views that inherit their layout direction. 11278 * 11279 * The default implementation does nothing. 11280 * @hide 11281 */ 11282 public void onResolvedLayoutDirectionReset() { 11283 } 11284 11285 /** 11286 * Check if a Locale uses an RTL script. 11287 * 11288 * @param locale Locale to check 11289 * @return true if the Locale uses an RTL script. 11290 * @hide 11291 */ 11292 protected static boolean isLayoutDirectionRtl(Locale locale) { 11293 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11294 } 11295 11296 /** 11297 * This is called when the view is detached from a window. At this point it 11298 * no longer has a surface for drawing. 11299 * 11300 * @see #onAttachedToWindow() 11301 */ 11302 protected void onDetachedFromWindow() { 11303 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11304 11305 removeUnsetPressCallback(); 11306 removeLongPressCallback(); 11307 removePerformClickCallback(); 11308 removeSendViewScrolledAccessibilityEventCallback(); 11309 11310 destroyDrawingCache(); 11311 11312 destroyLayer(false); 11313 11314 if (mAttachInfo != null) { 11315 if (mDisplayList != null) { 11316 mAttachInfo.mViewRootImpl.invalidateDisplayList(mDisplayList); 11317 } 11318 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11319 } else { 11320 if (mDisplayList != null) { 11321 // Should never happen 11322 mDisplayList.invalidate(); 11323 } 11324 } 11325 11326 mCurrentAnimation = null; 11327 11328 resetResolvedLayoutDirection(); 11329 resetResolvedTextAlignment(); 11330 resetAccessibilityStateChanged(); 11331 } 11332 11333 /** 11334 * @return The number of times this view has been attached to a window 11335 */ 11336 protected int getWindowAttachCount() { 11337 return mWindowAttachCount; 11338 } 11339 11340 /** 11341 * Retrieve a unique token identifying the window this view is attached to. 11342 * @return Return the window's token for use in 11343 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11344 */ 11345 public IBinder getWindowToken() { 11346 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11347 } 11348 11349 /** 11350 * Retrieve a unique token identifying the top-level "real" window of 11351 * the window that this view is attached to. That is, this is like 11352 * {@link #getWindowToken}, except if the window this view in is a panel 11353 * window (attached to another containing window), then the token of 11354 * the containing window is returned instead. 11355 * 11356 * @return Returns the associated window token, either 11357 * {@link #getWindowToken()} or the containing window's token. 11358 */ 11359 public IBinder getApplicationWindowToken() { 11360 AttachInfo ai = mAttachInfo; 11361 if (ai != null) { 11362 IBinder appWindowToken = ai.mPanelParentWindowToken; 11363 if (appWindowToken == null) { 11364 appWindowToken = ai.mWindowToken; 11365 } 11366 return appWindowToken; 11367 } 11368 return null; 11369 } 11370 11371 /** 11372 * Retrieve private session object this view hierarchy is using to 11373 * communicate with the window manager. 11374 * @return the session object to communicate with the window manager 11375 */ 11376 /*package*/ IWindowSession getWindowSession() { 11377 return mAttachInfo != null ? mAttachInfo.mSession : null; 11378 } 11379 11380 /** 11381 * @param info the {@link android.view.View.AttachInfo} to associated with 11382 * this view 11383 */ 11384 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11385 //System.out.println("Attached! " + this); 11386 mAttachInfo = info; 11387 mWindowAttachCount++; 11388 // We will need to evaluate the drawable state at least once. 11389 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11390 if (mFloatingTreeObserver != null) { 11391 info.mTreeObserver.merge(mFloatingTreeObserver); 11392 mFloatingTreeObserver = null; 11393 } 11394 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11395 mAttachInfo.mScrollContainers.add(this); 11396 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11397 } 11398 performCollectViewAttributes(mAttachInfo, visibility); 11399 onAttachedToWindow(); 11400 11401 ListenerInfo li = mListenerInfo; 11402 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11403 li != null ? li.mOnAttachStateChangeListeners : null; 11404 if (listeners != null && listeners.size() > 0) { 11405 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11406 // perform the dispatching. The iterator is a safe guard against listeners that 11407 // could mutate the list by calling the various add/remove methods. This prevents 11408 // the array from being modified while we iterate it. 11409 for (OnAttachStateChangeListener listener : listeners) { 11410 listener.onViewAttachedToWindow(this); 11411 } 11412 } 11413 11414 int vis = info.mWindowVisibility; 11415 if (vis != GONE) { 11416 onWindowVisibilityChanged(vis); 11417 } 11418 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11419 // If nobody has evaluated the drawable state yet, then do it now. 11420 refreshDrawableState(); 11421 } 11422 } 11423 11424 void dispatchDetachedFromWindow() { 11425 AttachInfo info = mAttachInfo; 11426 if (info != null) { 11427 int vis = info.mWindowVisibility; 11428 if (vis != GONE) { 11429 onWindowVisibilityChanged(GONE); 11430 } 11431 } 11432 11433 onDetachedFromWindow(); 11434 11435 ListenerInfo li = mListenerInfo; 11436 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11437 li != null ? li.mOnAttachStateChangeListeners : null; 11438 if (listeners != null && listeners.size() > 0) { 11439 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11440 // perform the dispatching. The iterator is a safe guard against listeners that 11441 // could mutate the list by calling the various add/remove methods. This prevents 11442 // the array from being modified while we iterate it. 11443 for (OnAttachStateChangeListener listener : listeners) { 11444 listener.onViewDetachedFromWindow(this); 11445 } 11446 } 11447 11448 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11449 mAttachInfo.mScrollContainers.remove(this); 11450 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11451 } 11452 11453 mAttachInfo = null; 11454 } 11455 11456 /** 11457 * Store this view hierarchy's frozen state into the given container. 11458 * 11459 * @param container The SparseArray in which to save the view's state. 11460 * 11461 * @see #restoreHierarchyState(android.util.SparseArray) 11462 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11463 * @see #onSaveInstanceState() 11464 */ 11465 public void saveHierarchyState(SparseArray<Parcelable> container) { 11466 dispatchSaveInstanceState(container); 11467 } 11468 11469 /** 11470 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11471 * this view and its children. May be overridden to modify how freezing happens to a 11472 * view's children; for example, some views may want to not store state for their children. 11473 * 11474 * @param container The SparseArray in which to save the view's state. 11475 * 11476 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11477 * @see #saveHierarchyState(android.util.SparseArray) 11478 * @see #onSaveInstanceState() 11479 */ 11480 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11481 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11482 mPrivateFlags &= ~SAVE_STATE_CALLED; 11483 Parcelable state = onSaveInstanceState(); 11484 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11485 throw new IllegalStateException( 11486 "Derived class did not call super.onSaveInstanceState()"); 11487 } 11488 if (state != null) { 11489 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11490 // + ": " + state); 11491 container.put(mID, state); 11492 } 11493 } 11494 } 11495 11496 /** 11497 * Hook allowing a view to generate a representation of its internal state 11498 * that can later be used to create a new instance with that same state. 11499 * This state should only contain information that is not persistent or can 11500 * not be reconstructed later. For example, you will never store your 11501 * current position on screen because that will be computed again when a 11502 * new instance of the view is placed in its view hierarchy. 11503 * <p> 11504 * Some examples of things you may store here: the current cursor position 11505 * in a text view (but usually not the text itself since that is stored in a 11506 * content provider or other persistent storage), the currently selected 11507 * item in a list view. 11508 * 11509 * @return Returns a Parcelable object containing the view's current dynamic 11510 * state, or null if there is nothing interesting to save. The 11511 * default implementation returns null. 11512 * @see #onRestoreInstanceState(android.os.Parcelable) 11513 * @see #saveHierarchyState(android.util.SparseArray) 11514 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11515 * @see #setSaveEnabled(boolean) 11516 */ 11517 protected Parcelable onSaveInstanceState() { 11518 mPrivateFlags |= SAVE_STATE_CALLED; 11519 return BaseSavedState.EMPTY_STATE; 11520 } 11521 11522 /** 11523 * Restore this view hierarchy's frozen state from the given container. 11524 * 11525 * @param container The SparseArray which holds previously frozen states. 11526 * 11527 * @see #saveHierarchyState(android.util.SparseArray) 11528 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11529 * @see #onRestoreInstanceState(android.os.Parcelable) 11530 */ 11531 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11532 dispatchRestoreInstanceState(container); 11533 } 11534 11535 /** 11536 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11537 * state for this view and its children. May be overridden to modify how restoring 11538 * happens to a view's children; for example, some views may want to not store state 11539 * for their children. 11540 * 11541 * @param container The SparseArray which holds previously saved state. 11542 * 11543 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11544 * @see #restoreHierarchyState(android.util.SparseArray) 11545 * @see #onRestoreInstanceState(android.os.Parcelable) 11546 */ 11547 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11548 if (mID != NO_ID) { 11549 Parcelable state = container.get(mID); 11550 if (state != null) { 11551 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11552 // + ": " + state); 11553 mPrivateFlags &= ~SAVE_STATE_CALLED; 11554 onRestoreInstanceState(state); 11555 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11556 throw new IllegalStateException( 11557 "Derived class did not call super.onRestoreInstanceState()"); 11558 } 11559 } 11560 } 11561 } 11562 11563 /** 11564 * Hook allowing a view to re-apply a representation of its internal state that had previously 11565 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11566 * null state. 11567 * 11568 * @param state The frozen state that had previously been returned by 11569 * {@link #onSaveInstanceState}. 11570 * 11571 * @see #onSaveInstanceState() 11572 * @see #restoreHierarchyState(android.util.SparseArray) 11573 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11574 */ 11575 protected void onRestoreInstanceState(Parcelable state) { 11576 mPrivateFlags |= SAVE_STATE_CALLED; 11577 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11578 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11579 + "received " + state.getClass().toString() + " instead. This usually happens " 11580 + "when two views of different type have the same id in the same hierarchy. " 11581 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11582 + "other views do not use the same id."); 11583 } 11584 } 11585 11586 /** 11587 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11588 * 11589 * @return the drawing start time in milliseconds 11590 */ 11591 public long getDrawingTime() { 11592 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11593 } 11594 11595 /** 11596 * <p>Enables or disables the duplication of the parent's state into this view. When 11597 * duplication is enabled, this view gets its drawable state from its parent rather 11598 * than from its own internal properties.</p> 11599 * 11600 * <p>Note: in the current implementation, setting this property to true after the 11601 * view was added to a ViewGroup might have no effect at all. This property should 11602 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11603 * 11604 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11605 * property is enabled, an exception will be thrown.</p> 11606 * 11607 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11608 * parent, these states should not be affected by this method.</p> 11609 * 11610 * @param enabled True to enable duplication of the parent's drawable state, false 11611 * to disable it. 11612 * 11613 * @see #getDrawableState() 11614 * @see #isDuplicateParentStateEnabled() 11615 */ 11616 public void setDuplicateParentStateEnabled(boolean enabled) { 11617 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11618 } 11619 11620 /** 11621 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11622 * 11623 * @return True if this view's drawable state is duplicated from the parent, 11624 * false otherwise 11625 * 11626 * @see #getDrawableState() 11627 * @see #setDuplicateParentStateEnabled(boolean) 11628 */ 11629 public boolean isDuplicateParentStateEnabled() { 11630 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11631 } 11632 11633 /** 11634 * <p>Specifies the type of layer backing this view. The layer can be 11635 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11636 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11637 * 11638 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11639 * instance that controls how the layer is composed on screen. The following 11640 * properties of the paint are taken into account when composing the layer:</p> 11641 * <ul> 11642 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11643 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11644 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11645 * </ul> 11646 * 11647 * <p>If this view has an alpha value set to < 1.0 by calling 11648 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11649 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11650 * equivalent to setting a hardware layer on this view and providing a paint with 11651 * the desired alpha value.<p> 11652 * 11653 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11654 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11655 * for more information on when and how to use layers.</p> 11656 * 11657 * @param layerType The ype of layer to use with this view, must be one of 11658 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11659 * {@link #LAYER_TYPE_HARDWARE} 11660 * @param paint The paint used to compose the layer. This argument is optional 11661 * and can be null. It is ignored when the layer type is 11662 * {@link #LAYER_TYPE_NONE} 11663 * 11664 * @see #getLayerType() 11665 * @see #LAYER_TYPE_NONE 11666 * @see #LAYER_TYPE_SOFTWARE 11667 * @see #LAYER_TYPE_HARDWARE 11668 * @see #setAlpha(float) 11669 * 11670 * @attr ref android.R.styleable#View_layerType 11671 */ 11672 public void setLayerType(int layerType, Paint paint) { 11673 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11674 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11675 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11676 } 11677 11678 if (layerType == mLayerType) { 11679 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11680 mLayerPaint = paint == null ? new Paint() : paint; 11681 invalidateParentCaches(); 11682 invalidate(true); 11683 } 11684 return; 11685 } 11686 11687 // Destroy any previous software drawing cache if needed 11688 switch (mLayerType) { 11689 case LAYER_TYPE_HARDWARE: 11690 destroyLayer(false); 11691 // fall through - non-accelerated views may use software layer mechanism instead 11692 case LAYER_TYPE_SOFTWARE: 11693 destroyDrawingCache(); 11694 break; 11695 default: 11696 break; 11697 } 11698 11699 mLayerType = layerType; 11700 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11701 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11702 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11703 11704 invalidateParentCaches(); 11705 invalidate(true); 11706 } 11707 11708 /** 11709 * Indicates whether this view has a static layer. A view with layer type 11710 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11711 * dynamic. 11712 */ 11713 boolean hasStaticLayer() { 11714 return true; 11715 } 11716 11717 /** 11718 * Indicates what type of layer is currently associated with this view. By default 11719 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11720 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11721 * for more information on the different types of layers. 11722 * 11723 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11724 * {@link #LAYER_TYPE_HARDWARE} 11725 * 11726 * @see #setLayerType(int, android.graphics.Paint) 11727 * @see #buildLayer() 11728 * @see #LAYER_TYPE_NONE 11729 * @see #LAYER_TYPE_SOFTWARE 11730 * @see #LAYER_TYPE_HARDWARE 11731 */ 11732 public int getLayerType() { 11733 return mLayerType; 11734 } 11735 11736 /** 11737 * Forces this view's layer to be created and this view to be rendered 11738 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11739 * invoking this method will have no effect. 11740 * 11741 * This method can for instance be used to render a view into its layer before 11742 * starting an animation. If this view is complex, rendering into the layer 11743 * before starting the animation will avoid skipping frames. 11744 * 11745 * @throws IllegalStateException If this view is not attached to a window 11746 * 11747 * @see #setLayerType(int, android.graphics.Paint) 11748 */ 11749 public void buildLayer() { 11750 if (mLayerType == LAYER_TYPE_NONE) return; 11751 11752 if (mAttachInfo == null) { 11753 throw new IllegalStateException("This view must be attached to a window first"); 11754 } 11755 11756 switch (mLayerType) { 11757 case LAYER_TYPE_HARDWARE: 11758 if (mAttachInfo.mHardwareRenderer != null && 11759 mAttachInfo.mHardwareRenderer.isEnabled() && 11760 mAttachInfo.mHardwareRenderer.validate()) { 11761 getHardwareLayer(); 11762 } 11763 break; 11764 case LAYER_TYPE_SOFTWARE: 11765 buildDrawingCache(true); 11766 break; 11767 } 11768 } 11769 11770 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11771 void flushLayer() { 11772 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11773 mHardwareLayer.flush(); 11774 } 11775 } 11776 11777 /** 11778 * <p>Returns a hardware layer that can be used to draw this view again 11779 * without executing its draw method.</p> 11780 * 11781 * @return A HardwareLayer ready to render, or null if an error occurred. 11782 */ 11783 HardwareLayer getHardwareLayer() { 11784 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11785 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11786 return null; 11787 } 11788 11789 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11790 11791 final int width = mRight - mLeft; 11792 final int height = mBottom - mTop; 11793 11794 if (width == 0 || height == 0) { 11795 return null; 11796 } 11797 11798 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11799 if (mHardwareLayer == null) { 11800 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11801 width, height, isOpaque()); 11802 mLocalDirtyRect.set(0, 0, width, height); 11803 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11804 mHardwareLayer.resize(width, height); 11805 mLocalDirtyRect.set(0, 0, width, height); 11806 } 11807 11808 // The layer is not valid if the underlying GPU resources cannot be allocated 11809 if (!mHardwareLayer.isValid()) { 11810 return null; 11811 } 11812 11813 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11814 mLocalDirtyRect.setEmpty(); 11815 } 11816 11817 return mHardwareLayer; 11818 } 11819 11820 /** 11821 * Destroys this View's hardware layer if possible. 11822 * 11823 * @return True if the layer was destroyed, false otherwise. 11824 * 11825 * @see #setLayerType(int, android.graphics.Paint) 11826 * @see #LAYER_TYPE_HARDWARE 11827 */ 11828 boolean destroyLayer(boolean valid) { 11829 if (mHardwareLayer != null) { 11830 AttachInfo info = mAttachInfo; 11831 if (info != null && info.mHardwareRenderer != null && 11832 info.mHardwareRenderer.isEnabled() && 11833 (valid || info.mHardwareRenderer.validate())) { 11834 mHardwareLayer.destroy(); 11835 mHardwareLayer = null; 11836 11837 invalidate(true); 11838 invalidateParentCaches(); 11839 } 11840 return true; 11841 } 11842 return false; 11843 } 11844 11845 /** 11846 * Destroys all hardware rendering resources. This method is invoked 11847 * when the system needs to reclaim resources. Upon execution of this 11848 * method, you should free any OpenGL resources created by the view. 11849 * 11850 * Note: you <strong>must</strong> call 11851 * <code>super.destroyHardwareResources()</code> when overriding 11852 * this method. 11853 * 11854 * @hide 11855 */ 11856 protected void destroyHardwareResources() { 11857 destroyLayer(true); 11858 } 11859 11860 /** 11861 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 11862 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 11863 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 11864 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 11865 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 11866 * null.</p> 11867 * 11868 * <p>Enabling the drawing cache is similar to 11869 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 11870 * acceleration is turned off. When hardware acceleration is turned on, enabling the 11871 * drawing cache has no effect on rendering because the system uses a different mechanism 11872 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 11873 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 11874 * for information on how to enable software and hardware layers.</p> 11875 * 11876 * <p>This API can be used to manually generate 11877 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 11878 * {@link #getDrawingCache()}.</p> 11879 * 11880 * @param enabled true to enable the drawing cache, false otherwise 11881 * 11882 * @see #isDrawingCacheEnabled() 11883 * @see #getDrawingCache() 11884 * @see #buildDrawingCache() 11885 * @see #setLayerType(int, android.graphics.Paint) 11886 */ 11887 public void setDrawingCacheEnabled(boolean enabled) { 11888 mCachingFailed = false; 11889 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 11890 } 11891 11892 /** 11893 * <p>Indicates whether the drawing cache is enabled for this view.</p> 11894 * 11895 * @return true if the drawing cache is enabled 11896 * 11897 * @see #setDrawingCacheEnabled(boolean) 11898 * @see #getDrawingCache() 11899 */ 11900 @ViewDebug.ExportedProperty(category = "drawing") 11901 public boolean isDrawingCacheEnabled() { 11902 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 11903 } 11904 11905 /** 11906 * Debugging utility which recursively outputs the dirty state of a view and its 11907 * descendants. 11908 * 11909 * @hide 11910 */ 11911 @SuppressWarnings({"UnusedDeclaration"}) 11912 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 11913 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 11914 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 11915 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 11916 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 11917 if (clear) { 11918 mPrivateFlags &= clearMask; 11919 } 11920 if (this instanceof ViewGroup) { 11921 ViewGroup parent = (ViewGroup) this; 11922 final int count = parent.getChildCount(); 11923 for (int i = 0; i < count; i++) { 11924 final View child = parent.getChildAt(i); 11925 child.outputDirtyFlags(indent + " ", clear, clearMask); 11926 } 11927 } 11928 } 11929 11930 /** 11931 * This method is used by ViewGroup to cause its children to restore or recreate their 11932 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 11933 * to recreate its own display list, which would happen if it went through the normal 11934 * draw/dispatchDraw mechanisms. 11935 * 11936 * @hide 11937 */ 11938 protected void dispatchGetDisplayList() {} 11939 11940 /** 11941 * A view that is not attached or hardware accelerated cannot create a display list. 11942 * This method checks these conditions and returns the appropriate result. 11943 * 11944 * @return true if view has the ability to create a display list, false otherwise. 11945 * 11946 * @hide 11947 */ 11948 public boolean canHaveDisplayList() { 11949 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 11950 } 11951 11952 /** 11953 * @return The HardwareRenderer associated with that view or null if hardware rendering 11954 * is not supported or this this has not been attached to a window. 11955 * 11956 * @hide 11957 */ 11958 public HardwareRenderer getHardwareRenderer() { 11959 if (mAttachInfo != null) { 11960 return mAttachInfo.mHardwareRenderer; 11961 } 11962 return null; 11963 } 11964 11965 /** 11966 * Returns a DisplayList. If the incoming displayList is null, one will be created. 11967 * Otherwise, the same display list will be returned (after having been rendered into 11968 * along the way, depending on the invalidation state of the view). 11969 * 11970 * @param displayList The previous version of this displayList, could be null. 11971 * @param isLayer Whether the requester of the display list is a layer. If so, 11972 * the view will avoid creating a layer inside the resulting display list. 11973 * @return A new or reused DisplayList object. 11974 */ 11975 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 11976 if (!canHaveDisplayList()) { 11977 return null; 11978 } 11979 11980 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 11981 displayList == null || !displayList.isValid() || 11982 (!isLayer && mRecreateDisplayList))) { 11983 // Don't need to recreate the display list, just need to tell our 11984 // children to restore/recreate theirs 11985 if (displayList != null && displayList.isValid() && 11986 !isLayer && !mRecreateDisplayList) { 11987 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 11988 mPrivateFlags &= ~DIRTY_MASK; 11989 dispatchGetDisplayList(); 11990 11991 return displayList; 11992 } 11993 11994 if (!isLayer) { 11995 // If we got here, we're recreating it. Mark it as such to ensure that 11996 // we copy in child display lists into ours in drawChild() 11997 mRecreateDisplayList = true; 11998 } 11999 if (displayList == null) { 12000 final String name = getClass().getSimpleName(); 12001 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12002 // If we're creating a new display list, make sure our parent gets invalidated 12003 // since they will need to recreate their display list to account for this 12004 // new child display list. 12005 invalidateParentCaches(); 12006 } 12007 12008 boolean caching = false; 12009 final HardwareCanvas canvas = displayList.start(); 12010 int restoreCount = 0; 12011 int width = mRight - mLeft; 12012 int height = mBottom - mTop; 12013 12014 try { 12015 canvas.setViewport(width, height); 12016 // The dirty rect should always be null for a display list 12017 canvas.onPreDraw(null); 12018 int layerType = ( 12019 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 12020 getLayerType() : LAYER_TYPE_NONE; 12021 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12022 if (layerType == LAYER_TYPE_HARDWARE) { 12023 final HardwareLayer layer = getHardwareLayer(); 12024 if (layer != null && layer.isValid()) { 12025 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12026 } else { 12027 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12028 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12029 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12030 } 12031 caching = true; 12032 } else { 12033 buildDrawingCache(true); 12034 Bitmap cache = getDrawingCache(true); 12035 if (cache != null) { 12036 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12037 caching = true; 12038 } 12039 } 12040 } else { 12041 12042 computeScroll(); 12043 12044 canvas.translate(-mScrollX, -mScrollY); 12045 if (!isLayer) { 12046 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12047 mPrivateFlags &= ~DIRTY_MASK; 12048 } 12049 12050 // Fast path for layouts with no backgrounds 12051 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12052 dispatchDraw(canvas); 12053 } else { 12054 draw(canvas); 12055 } 12056 } 12057 } finally { 12058 canvas.onPostDraw(); 12059 12060 displayList.end(); 12061 displayList.setCaching(caching); 12062 if (isLayer) { 12063 displayList.setLeftTopRightBottom(0, 0, width, height); 12064 } else { 12065 setDisplayListProperties(displayList); 12066 } 12067 } 12068 } else if (!isLayer) { 12069 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12070 mPrivateFlags &= ~DIRTY_MASK; 12071 } 12072 12073 return displayList; 12074 } 12075 12076 /** 12077 * Get the DisplayList for the HardwareLayer 12078 * 12079 * @param layer The HardwareLayer whose DisplayList we want 12080 * @return A DisplayList fopr the specified HardwareLayer 12081 */ 12082 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12083 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12084 layer.setDisplayList(displayList); 12085 return displayList; 12086 } 12087 12088 12089 /** 12090 * <p>Returns a display list that can be used to draw this view again 12091 * without executing its draw method.</p> 12092 * 12093 * @return A DisplayList ready to replay, or null if caching is not enabled. 12094 * 12095 * @hide 12096 */ 12097 public DisplayList getDisplayList() { 12098 mDisplayList = getDisplayList(mDisplayList, false); 12099 return mDisplayList; 12100 } 12101 12102 /** 12103 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12104 * 12105 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12106 * 12107 * @see #getDrawingCache(boolean) 12108 */ 12109 public Bitmap getDrawingCache() { 12110 return getDrawingCache(false); 12111 } 12112 12113 /** 12114 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12115 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12116 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12117 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12118 * request the drawing cache by calling this method and draw it on screen if the 12119 * returned bitmap is not null.</p> 12120 * 12121 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12122 * this method will create a bitmap of the same size as this view. Because this bitmap 12123 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12124 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12125 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12126 * size than the view. This implies that your application must be able to handle this 12127 * size.</p> 12128 * 12129 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12130 * the current density of the screen when the application is in compatibility 12131 * mode. 12132 * 12133 * @return A bitmap representing this view or null if cache is disabled. 12134 * 12135 * @see #setDrawingCacheEnabled(boolean) 12136 * @see #isDrawingCacheEnabled() 12137 * @see #buildDrawingCache(boolean) 12138 * @see #destroyDrawingCache() 12139 */ 12140 public Bitmap getDrawingCache(boolean autoScale) { 12141 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12142 return null; 12143 } 12144 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12145 buildDrawingCache(autoScale); 12146 } 12147 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12148 } 12149 12150 /** 12151 * <p>Frees the resources used by the drawing cache. If you call 12152 * {@link #buildDrawingCache()} manually without calling 12153 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12154 * should cleanup the cache with this method afterwards.</p> 12155 * 12156 * @see #setDrawingCacheEnabled(boolean) 12157 * @see #buildDrawingCache() 12158 * @see #getDrawingCache() 12159 */ 12160 public void destroyDrawingCache() { 12161 if (mDrawingCache != null) { 12162 mDrawingCache.recycle(); 12163 mDrawingCache = null; 12164 } 12165 if (mUnscaledDrawingCache != null) { 12166 mUnscaledDrawingCache.recycle(); 12167 mUnscaledDrawingCache = null; 12168 } 12169 } 12170 12171 /** 12172 * Setting a solid background color for the drawing cache's bitmaps will improve 12173 * performance and memory usage. Note, though that this should only be used if this 12174 * view will always be drawn on top of a solid color. 12175 * 12176 * @param color The background color to use for the drawing cache's bitmap 12177 * 12178 * @see #setDrawingCacheEnabled(boolean) 12179 * @see #buildDrawingCache() 12180 * @see #getDrawingCache() 12181 */ 12182 public void setDrawingCacheBackgroundColor(int color) { 12183 if (color != mDrawingCacheBackgroundColor) { 12184 mDrawingCacheBackgroundColor = color; 12185 mPrivateFlags &= ~DRAWING_CACHE_VALID; 12186 } 12187 } 12188 12189 /** 12190 * @see #setDrawingCacheBackgroundColor(int) 12191 * 12192 * @return The background color to used for the drawing cache's bitmap 12193 */ 12194 public int getDrawingCacheBackgroundColor() { 12195 return mDrawingCacheBackgroundColor; 12196 } 12197 12198 /** 12199 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12200 * 12201 * @see #buildDrawingCache(boolean) 12202 */ 12203 public void buildDrawingCache() { 12204 buildDrawingCache(false); 12205 } 12206 12207 /** 12208 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12209 * 12210 * <p>If you call {@link #buildDrawingCache()} manually without calling 12211 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12212 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12213 * 12214 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12215 * this method will create a bitmap of the same size as this view. Because this bitmap 12216 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12217 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12218 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12219 * size than the view. This implies that your application must be able to handle this 12220 * size.</p> 12221 * 12222 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12223 * you do not need the drawing cache bitmap, calling this method will increase memory 12224 * usage and cause the view to be rendered in software once, thus negatively impacting 12225 * performance.</p> 12226 * 12227 * @see #getDrawingCache() 12228 * @see #destroyDrawingCache() 12229 */ 12230 public void buildDrawingCache(boolean autoScale) { 12231 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12232 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12233 mCachingFailed = false; 12234 12235 if (ViewDebug.TRACE_HIERARCHY) { 12236 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 12237 } 12238 12239 int width = mRight - mLeft; 12240 int height = mBottom - mTop; 12241 12242 final AttachInfo attachInfo = mAttachInfo; 12243 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12244 12245 if (autoScale && scalingRequired) { 12246 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12247 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12248 } 12249 12250 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12251 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12252 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12253 12254 if (width <= 0 || height <= 0 || 12255 // Projected bitmap size in bytes 12256 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12257 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12258 destroyDrawingCache(); 12259 mCachingFailed = true; 12260 return; 12261 } 12262 12263 boolean clear = true; 12264 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12265 12266 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12267 Bitmap.Config quality; 12268 if (!opaque) { 12269 // Never pick ARGB_4444 because it looks awful 12270 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12271 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12272 case DRAWING_CACHE_QUALITY_AUTO: 12273 quality = Bitmap.Config.ARGB_8888; 12274 break; 12275 case DRAWING_CACHE_QUALITY_LOW: 12276 quality = Bitmap.Config.ARGB_8888; 12277 break; 12278 case DRAWING_CACHE_QUALITY_HIGH: 12279 quality = Bitmap.Config.ARGB_8888; 12280 break; 12281 default: 12282 quality = Bitmap.Config.ARGB_8888; 12283 break; 12284 } 12285 } else { 12286 // Optimization for translucent windows 12287 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12288 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12289 } 12290 12291 // Try to cleanup memory 12292 if (bitmap != null) bitmap.recycle(); 12293 12294 try { 12295 bitmap = Bitmap.createBitmap(width, height, quality); 12296 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12297 if (autoScale) { 12298 mDrawingCache = bitmap; 12299 } else { 12300 mUnscaledDrawingCache = bitmap; 12301 } 12302 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12303 } catch (OutOfMemoryError e) { 12304 // If there is not enough memory to create the bitmap cache, just 12305 // ignore the issue as bitmap caches are not required to draw the 12306 // view hierarchy 12307 if (autoScale) { 12308 mDrawingCache = null; 12309 } else { 12310 mUnscaledDrawingCache = null; 12311 } 12312 mCachingFailed = true; 12313 return; 12314 } 12315 12316 clear = drawingCacheBackgroundColor != 0; 12317 } 12318 12319 Canvas canvas; 12320 if (attachInfo != null) { 12321 canvas = attachInfo.mCanvas; 12322 if (canvas == null) { 12323 canvas = new Canvas(); 12324 } 12325 canvas.setBitmap(bitmap); 12326 // Temporarily clobber the cached Canvas in case one of our children 12327 // is also using a drawing cache. Without this, the children would 12328 // steal the canvas by attaching their own bitmap to it and bad, bad 12329 // thing would happen (invisible views, corrupted drawings, etc.) 12330 attachInfo.mCanvas = null; 12331 } else { 12332 // This case should hopefully never or seldom happen 12333 canvas = new Canvas(bitmap); 12334 } 12335 12336 if (clear) { 12337 bitmap.eraseColor(drawingCacheBackgroundColor); 12338 } 12339 12340 computeScroll(); 12341 final int restoreCount = canvas.save(); 12342 12343 if (autoScale && scalingRequired) { 12344 final float scale = attachInfo.mApplicationScale; 12345 canvas.scale(scale, scale); 12346 } 12347 12348 canvas.translate(-mScrollX, -mScrollY); 12349 12350 mPrivateFlags |= DRAWN; 12351 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12352 mLayerType != LAYER_TYPE_NONE) { 12353 mPrivateFlags |= DRAWING_CACHE_VALID; 12354 } 12355 12356 // Fast path for layouts with no backgrounds 12357 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12358 if (ViewDebug.TRACE_HIERARCHY) { 12359 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12360 } 12361 mPrivateFlags &= ~DIRTY_MASK; 12362 dispatchDraw(canvas); 12363 } else { 12364 draw(canvas); 12365 } 12366 12367 canvas.restoreToCount(restoreCount); 12368 canvas.setBitmap(null); 12369 12370 if (attachInfo != null) { 12371 // Restore the cached Canvas for our siblings 12372 attachInfo.mCanvas = canvas; 12373 } 12374 } 12375 } 12376 12377 /** 12378 * Create a snapshot of the view into a bitmap. We should probably make 12379 * some form of this public, but should think about the API. 12380 */ 12381 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12382 int width = mRight - mLeft; 12383 int height = mBottom - mTop; 12384 12385 final AttachInfo attachInfo = mAttachInfo; 12386 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12387 width = (int) ((width * scale) + 0.5f); 12388 height = (int) ((height * scale) + 0.5f); 12389 12390 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12391 if (bitmap == null) { 12392 throw new OutOfMemoryError(); 12393 } 12394 12395 Resources resources = getResources(); 12396 if (resources != null) { 12397 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12398 } 12399 12400 Canvas canvas; 12401 if (attachInfo != null) { 12402 canvas = attachInfo.mCanvas; 12403 if (canvas == null) { 12404 canvas = new Canvas(); 12405 } 12406 canvas.setBitmap(bitmap); 12407 // Temporarily clobber the cached Canvas in case one of our children 12408 // is also using a drawing cache. Without this, the children would 12409 // steal the canvas by attaching their own bitmap to it and bad, bad 12410 // things would happen (invisible views, corrupted drawings, etc.) 12411 attachInfo.mCanvas = null; 12412 } else { 12413 // This case should hopefully never or seldom happen 12414 canvas = new Canvas(bitmap); 12415 } 12416 12417 if ((backgroundColor & 0xff000000) != 0) { 12418 bitmap.eraseColor(backgroundColor); 12419 } 12420 12421 computeScroll(); 12422 final int restoreCount = canvas.save(); 12423 canvas.scale(scale, scale); 12424 canvas.translate(-mScrollX, -mScrollY); 12425 12426 // Temporarily remove the dirty mask 12427 int flags = mPrivateFlags; 12428 mPrivateFlags &= ~DIRTY_MASK; 12429 12430 // Fast path for layouts with no backgrounds 12431 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12432 dispatchDraw(canvas); 12433 } else { 12434 draw(canvas); 12435 } 12436 12437 mPrivateFlags = flags; 12438 12439 canvas.restoreToCount(restoreCount); 12440 canvas.setBitmap(null); 12441 12442 if (attachInfo != null) { 12443 // Restore the cached Canvas for our siblings 12444 attachInfo.mCanvas = canvas; 12445 } 12446 12447 return bitmap; 12448 } 12449 12450 /** 12451 * Indicates whether this View is currently in edit mode. A View is usually 12452 * in edit mode when displayed within a developer tool. For instance, if 12453 * this View is being drawn by a visual user interface builder, this method 12454 * should return true. 12455 * 12456 * Subclasses should check the return value of this method to provide 12457 * different behaviors if their normal behavior might interfere with the 12458 * host environment. For instance: the class spawns a thread in its 12459 * constructor, the drawing code relies on device-specific features, etc. 12460 * 12461 * This method is usually checked in the drawing code of custom widgets. 12462 * 12463 * @return True if this View is in edit mode, false otherwise. 12464 */ 12465 public boolean isInEditMode() { 12466 return false; 12467 } 12468 12469 /** 12470 * If the View draws content inside its padding and enables fading edges, 12471 * it needs to support padding offsets. Padding offsets are added to the 12472 * fading edges to extend the length of the fade so that it covers pixels 12473 * drawn inside the padding. 12474 * 12475 * Subclasses of this class should override this method if they need 12476 * to draw content inside the padding. 12477 * 12478 * @return True if padding offset must be applied, false otherwise. 12479 * 12480 * @see #getLeftPaddingOffset() 12481 * @see #getRightPaddingOffset() 12482 * @see #getTopPaddingOffset() 12483 * @see #getBottomPaddingOffset() 12484 * 12485 * @since CURRENT 12486 */ 12487 protected boolean isPaddingOffsetRequired() { 12488 return false; 12489 } 12490 12491 /** 12492 * Amount by which to extend the left fading region. Called only when 12493 * {@link #isPaddingOffsetRequired()} returns true. 12494 * 12495 * @return The left padding offset in pixels. 12496 * 12497 * @see #isPaddingOffsetRequired() 12498 * 12499 * @since CURRENT 12500 */ 12501 protected int getLeftPaddingOffset() { 12502 return 0; 12503 } 12504 12505 /** 12506 * Amount by which to extend the right fading region. Called only when 12507 * {@link #isPaddingOffsetRequired()} returns true. 12508 * 12509 * @return The right padding offset in pixels. 12510 * 12511 * @see #isPaddingOffsetRequired() 12512 * 12513 * @since CURRENT 12514 */ 12515 protected int getRightPaddingOffset() { 12516 return 0; 12517 } 12518 12519 /** 12520 * Amount by which to extend the top fading region. Called only when 12521 * {@link #isPaddingOffsetRequired()} returns true. 12522 * 12523 * @return The top padding offset in pixels. 12524 * 12525 * @see #isPaddingOffsetRequired() 12526 * 12527 * @since CURRENT 12528 */ 12529 protected int getTopPaddingOffset() { 12530 return 0; 12531 } 12532 12533 /** 12534 * Amount by which to extend the bottom fading region. Called only when 12535 * {@link #isPaddingOffsetRequired()} returns true. 12536 * 12537 * @return The bottom padding offset in pixels. 12538 * 12539 * @see #isPaddingOffsetRequired() 12540 * 12541 * @since CURRENT 12542 */ 12543 protected int getBottomPaddingOffset() { 12544 return 0; 12545 } 12546 12547 /** 12548 * @hide 12549 * @param offsetRequired 12550 */ 12551 protected int getFadeTop(boolean offsetRequired) { 12552 int top = mPaddingTop; 12553 if (offsetRequired) top += getTopPaddingOffset(); 12554 return top; 12555 } 12556 12557 /** 12558 * @hide 12559 * @param offsetRequired 12560 */ 12561 protected int getFadeHeight(boolean offsetRequired) { 12562 int padding = mPaddingTop; 12563 if (offsetRequired) padding += getTopPaddingOffset(); 12564 return mBottom - mTop - mPaddingBottom - padding; 12565 } 12566 12567 /** 12568 * <p>Indicates whether this view is attached to a hardware accelerated 12569 * window or not.</p> 12570 * 12571 * <p>Even if this method returns true, it does not mean that every call 12572 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12573 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12574 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12575 * window is hardware accelerated, 12576 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12577 * return false, and this method will return true.</p> 12578 * 12579 * @return True if the view is attached to a window and the window is 12580 * hardware accelerated; false in any other case. 12581 */ 12582 public boolean isHardwareAccelerated() { 12583 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12584 } 12585 12586 /** 12587 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12588 * case of an active Animation being run on the view. 12589 */ 12590 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12591 Animation a, boolean scalingRequired) { 12592 Transformation invalidationTransform; 12593 final int flags = parent.mGroupFlags; 12594 final boolean initialized = a.isInitialized(); 12595 if (!initialized) { 12596 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12597 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12598 onAnimationStart(); 12599 } 12600 12601 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12602 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12603 if (parent.mInvalidationTransformation == null) { 12604 parent.mInvalidationTransformation = new Transformation(); 12605 } 12606 invalidationTransform = parent.mInvalidationTransformation; 12607 a.getTransformation(drawingTime, invalidationTransform, 1f); 12608 } else { 12609 invalidationTransform = parent.mChildTransformation; 12610 } 12611 if (more) { 12612 if (!a.willChangeBounds()) { 12613 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12614 parent.FLAG_OPTIMIZE_INVALIDATE) { 12615 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12616 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12617 // The child need to draw an animation, potentially offscreen, so 12618 // make sure we do not cancel invalidate requests 12619 parent.mPrivateFlags |= DRAW_ANIMATION; 12620 parent.invalidate(mLeft, mTop, mRight, mBottom); 12621 } 12622 } else { 12623 if (parent.mInvalidateRegion == null) { 12624 parent.mInvalidateRegion = new RectF(); 12625 } 12626 final RectF region = parent.mInvalidateRegion; 12627 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12628 invalidationTransform); 12629 12630 // The child need to draw an animation, potentially offscreen, so 12631 // make sure we do not cancel invalidate requests 12632 parent.mPrivateFlags |= DRAW_ANIMATION; 12633 12634 final int left = mLeft + (int) region.left; 12635 final int top = mTop + (int) region.top; 12636 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12637 top + (int) (region.height() + .5f)); 12638 } 12639 } 12640 return more; 12641 } 12642 12643 void setDisplayListProperties() { 12644 setDisplayListProperties(mDisplayList); 12645 } 12646 12647 /** 12648 * This method is called by getDisplayList() when a display list is created or re-rendered. 12649 * It sets or resets the current value of all properties on that display list (resetting is 12650 * necessary when a display list is being re-created, because we need to make sure that 12651 * previously-set transform values 12652 */ 12653 void setDisplayListProperties(DisplayList displayList) { 12654 if (displayList != null) { 12655 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12656 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12657 if (mParent instanceof ViewGroup) { 12658 displayList.setClipChildren( 12659 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12660 } 12661 float alpha = 1; 12662 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12663 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12664 ViewGroup parentVG = (ViewGroup) mParent; 12665 final boolean hasTransform = 12666 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12667 if (hasTransform) { 12668 Transformation transform = parentVG.mChildTransformation; 12669 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12670 if (transformType != Transformation.TYPE_IDENTITY) { 12671 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12672 alpha = transform.getAlpha(); 12673 } 12674 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12675 displayList.setStaticMatrix(transform.getMatrix()); 12676 } 12677 } 12678 } 12679 } 12680 if (mTransformationInfo != null) { 12681 alpha *= mTransformationInfo.mAlpha; 12682 if (alpha < 1) { 12683 final int multipliedAlpha = (int) (255 * alpha); 12684 if (onSetAlpha(multipliedAlpha)) { 12685 alpha = 1; 12686 } 12687 } 12688 displayList.setTransformationInfo(alpha, 12689 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12690 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12691 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12692 mTransformationInfo.mScaleY); 12693 if (mTransformationInfo.mCamera == null) { 12694 mTransformationInfo.mCamera = new Camera(); 12695 mTransformationInfo.matrix3D = new Matrix(); 12696 } 12697 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12698 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12699 displayList.setPivotX(getPivotX()); 12700 displayList.setPivotY(getPivotY()); 12701 } 12702 } else if (alpha < 1) { 12703 displayList.setAlpha(alpha); 12704 } 12705 } 12706 } 12707 12708 /** 12709 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12710 * This draw() method is an implementation detail and is not intended to be overridden or 12711 * to be called from anywhere else other than ViewGroup.drawChild(). 12712 */ 12713 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12714 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12715 boolean more = false; 12716 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12717 final int flags = parent.mGroupFlags; 12718 12719 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12720 parent.mChildTransformation.clear(); 12721 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12722 } 12723 12724 Transformation transformToApply = null; 12725 boolean concatMatrix = false; 12726 12727 boolean scalingRequired = false; 12728 boolean caching; 12729 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 12730 12731 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12732 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12733 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12734 caching = true; 12735 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12736 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12737 } else { 12738 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12739 } 12740 12741 final Animation a = getAnimation(); 12742 if (a != null) { 12743 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12744 concatMatrix = a.willChangeTransformationMatrix(); 12745 transformToApply = parent.mChildTransformation; 12746 } else if (!useDisplayListProperties && 12747 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12748 final boolean hasTransform = 12749 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12750 if (hasTransform) { 12751 final int transformType = parent.mChildTransformation.getTransformationType(); 12752 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12753 parent.mChildTransformation : null; 12754 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12755 } 12756 } 12757 12758 concatMatrix |= !childHasIdentityMatrix; 12759 12760 // Sets the flag as early as possible to allow draw() implementations 12761 // to call invalidate() successfully when doing animations 12762 mPrivateFlags |= DRAWN; 12763 12764 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12765 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12766 return more; 12767 } 12768 12769 if (hardwareAccelerated) { 12770 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12771 // retain the flag's value temporarily in the mRecreateDisplayList flag 12772 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12773 mPrivateFlags &= ~INVALIDATED; 12774 } 12775 12776 computeScroll(); 12777 12778 final int sx = mScrollX; 12779 final int sy = mScrollY; 12780 12781 DisplayList displayList = null; 12782 Bitmap cache = null; 12783 boolean hasDisplayList = false; 12784 if (caching) { 12785 if (!hardwareAccelerated) { 12786 if (layerType != LAYER_TYPE_NONE) { 12787 layerType = LAYER_TYPE_SOFTWARE; 12788 buildDrawingCache(true); 12789 } 12790 cache = getDrawingCache(true); 12791 } else { 12792 switch (layerType) { 12793 case LAYER_TYPE_SOFTWARE: 12794 if (useDisplayListProperties) { 12795 hasDisplayList = canHaveDisplayList(); 12796 } else { 12797 buildDrawingCache(true); 12798 cache = getDrawingCache(true); 12799 } 12800 break; 12801 case LAYER_TYPE_HARDWARE: 12802 if (useDisplayListProperties) { 12803 hasDisplayList = canHaveDisplayList(); 12804 } 12805 break; 12806 case LAYER_TYPE_NONE: 12807 // Delay getting the display list until animation-driven alpha values are 12808 // set up and possibly passed on to the view 12809 hasDisplayList = canHaveDisplayList(); 12810 break; 12811 } 12812 } 12813 } 12814 useDisplayListProperties &= hasDisplayList; 12815 if (useDisplayListProperties) { 12816 displayList = getDisplayList(); 12817 if (!displayList.isValid()) { 12818 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12819 // to getDisplayList(), the display list will be marked invalid and we should not 12820 // try to use it again. 12821 displayList = null; 12822 hasDisplayList = false; 12823 useDisplayListProperties = false; 12824 } 12825 } 12826 12827 final boolean hasNoCache = cache == null || hasDisplayList; 12828 final boolean offsetForScroll = cache == null && !hasDisplayList && 12829 layerType != LAYER_TYPE_HARDWARE; 12830 12831 int restoreTo = -1; 12832 if (!useDisplayListProperties || transformToApply != null) { 12833 restoreTo = canvas.save(); 12834 } 12835 if (offsetForScroll) { 12836 canvas.translate(mLeft - sx, mTop - sy); 12837 } else { 12838 if (!useDisplayListProperties) { 12839 canvas.translate(mLeft, mTop); 12840 } 12841 if (scalingRequired) { 12842 if (useDisplayListProperties) { 12843 // TODO: Might not need this if we put everything inside the DL 12844 restoreTo = canvas.save(); 12845 } 12846 // mAttachInfo cannot be null, otherwise scalingRequired == false 12847 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12848 canvas.scale(scale, scale); 12849 } 12850 } 12851 12852 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12853 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix()) { 12854 if (transformToApply != null || !childHasIdentityMatrix) { 12855 int transX = 0; 12856 int transY = 0; 12857 12858 if (offsetForScroll) { 12859 transX = -sx; 12860 transY = -sy; 12861 } 12862 12863 if (transformToApply != null) { 12864 if (concatMatrix) { 12865 if (useDisplayListProperties) { 12866 displayList.setAnimationMatrix(transformToApply.getMatrix()); 12867 } else { 12868 // Undo the scroll translation, apply the transformation matrix, 12869 // then redo the scroll translate to get the correct result. 12870 canvas.translate(-transX, -transY); 12871 canvas.concat(transformToApply.getMatrix()); 12872 canvas.translate(transX, transY); 12873 } 12874 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12875 } 12876 12877 float transformAlpha = transformToApply.getAlpha(); 12878 if (transformAlpha < 1) { 12879 alpha *= transformToApply.getAlpha(); 12880 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12881 } 12882 } 12883 12884 if (!childHasIdentityMatrix && !useDisplayListProperties) { 12885 canvas.translate(-transX, -transY); 12886 canvas.concat(getMatrix()); 12887 canvas.translate(transX, transY); 12888 } 12889 } 12890 12891 if (alpha < 1) { 12892 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12893 if (hasNoCache) { 12894 final int multipliedAlpha = (int) (255 * alpha); 12895 if (!onSetAlpha(multipliedAlpha)) { 12896 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 12897 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 12898 layerType != LAYER_TYPE_NONE) { 12899 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 12900 } 12901 if (useDisplayListProperties) { 12902 displayList.setAlpha(alpha * getAlpha()); 12903 } else if (layerType == LAYER_TYPE_NONE) { 12904 final int scrollX = hasDisplayList ? 0 : sx; 12905 final int scrollY = hasDisplayList ? 0 : sy; 12906 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 12907 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 12908 } 12909 } else { 12910 // Alpha is handled by the child directly, clobber the layer's alpha 12911 mPrivateFlags |= ALPHA_SET; 12912 } 12913 } 12914 } 12915 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 12916 onSetAlpha(255); 12917 mPrivateFlags &= ~ALPHA_SET; 12918 } 12919 12920 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 12921 !useDisplayListProperties) { 12922 if (offsetForScroll) { 12923 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 12924 } else { 12925 if (!scalingRequired || cache == null) { 12926 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 12927 } else { 12928 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 12929 } 12930 } 12931 } 12932 12933 if (!useDisplayListProperties && hasDisplayList) { 12934 displayList = getDisplayList(); 12935 if (!displayList.isValid()) { 12936 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12937 // to getDisplayList(), the display list will be marked invalid and we should not 12938 // try to use it again. 12939 displayList = null; 12940 hasDisplayList = false; 12941 } 12942 } 12943 12944 if (hasNoCache) { 12945 boolean layerRendered = false; 12946 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 12947 final HardwareLayer layer = getHardwareLayer(); 12948 if (layer != null && layer.isValid()) { 12949 mLayerPaint.setAlpha((int) (alpha * 255)); 12950 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 12951 layerRendered = true; 12952 } else { 12953 final int scrollX = hasDisplayList ? 0 : sx; 12954 final int scrollY = hasDisplayList ? 0 : sy; 12955 canvas.saveLayer(scrollX, scrollY, 12956 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 12957 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12958 } 12959 } 12960 12961 if (!layerRendered) { 12962 if (!hasDisplayList) { 12963 // Fast path for layouts with no backgrounds 12964 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12965 if (ViewDebug.TRACE_HIERARCHY) { 12966 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 12967 } 12968 mPrivateFlags &= ~DIRTY_MASK; 12969 dispatchDraw(canvas); 12970 } else { 12971 draw(canvas); 12972 } 12973 } else { 12974 mPrivateFlags &= ~DIRTY_MASK; 12975 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 12976 } 12977 } 12978 } else if (cache != null) { 12979 mPrivateFlags &= ~DIRTY_MASK; 12980 Paint cachePaint; 12981 12982 if (layerType == LAYER_TYPE_NONE) { 12983 cachePaint = parent.mCachePaint; 12984 if (cachePaint == null) { 12985 cachePaint = new Paint(); 12986 cachePaint.setDither(false); 12987 parent.mCachePaint = cachePaint; 12988 } 12989 if (alpha < 1) { 12990 cachePaint.setAlpha((int) (alpha * 255)); 12991 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 12992 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 12993 cachePaint.setAlpha(255); 12994 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 12995 } 12996 } else { 12997 cachePaint = mLayerPaint; 12998 cachePaint.setAlpha((int) (alpha * 255)); 12999 } 13000 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13001 } 13002 13003 if (restoreTo >= 0) { 13004 canvas.restoreToCount(restoreTo); 13005 } 13006 13007 if (a != null && !more) { 13008 if (!hardwareAccelerated && !a.getFillAfter()) { 13009 onSetAlpha(255); 13010 } 13011 parent.finishAnimatingView(this, a); 13012 } 13013 13014 if (more && hardwareAccelerated) { 13015 // invalidation is the trigger to recreate display lists, so if we're using 13016 // display lists to render, force an invalidate to allow the animation to 13017 // continue drawing another frame 13018 parent.invalidate(true); 13019 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13020 // alpha animations should cause the child to recreate its display list 13021 invalidate(true); 13022 } 13023 } 13024 13025 mRecreateDisplayList = false; 13026 13027 return more; 13028 } 13029 13030 /** 13031 * Manually render this view (and all of its children) to the given Canvas. 13032 * The view must have already done a full layout before this function is 13033 * called. When implementing a view, implement 13034 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13035 * If you do need to override this method, call the superclass version. 13036 * 13037 * @param canvas The Canvas to which the View is rendered. 13038 */ 13039 public void draw(Canvas canvas) { 13040 if (ViewDebug.TRACE_HIERARCHY) { 13041 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 13042 } 13043 13044 final int privateFlags = mPrivateFlags; 13045 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 13046 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13047 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 13048 13049 /* 13050 * Draw traversal performs several drawing steps which must be executed 13051 * in the appropriate order: 13052 * 13053 * 1. Draw the background 13054 * 2. If necessary, save the canvas' layers to prepare for fading 13055 * 3. Draw view's content 13056 * 4. Draw children 13057 * 5. If necessary, draw the fading edges and restore layers 13058 * 6. Draw decorations (scrollbars for instance) 13059 */ 13060 13061 // Step 1, draw the background, if needed 13062 int saveCount; 13063 13064 if (!dirtyOpaque) { 13065 final Drawable background = mBackground; 13066 if (background != null) { 13067 final int scrollX = mScrollX; 13068 final int scrollY = mScrollY; 13069 13070 if (mBackgroundSizeChanged) { 13071 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13072 mBackgroundSizeChanged = false; 13073 } 13074 13075 if ((scrollX | scrollY) == 0) { 13076 background.draw(canvas); 13077 } else { 13078 canvas.translate(scrollX, scrollY); 13079 background.draw(canvas); 13080 canvas.translate(-scrollX, -scrollY); 13081 } 13082 } 13083 } 13084 13085 // skip step 2 & 5 if possible (common case) 13086 final int viewFlags = mViewFlags; 13087 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13088 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13089 if (!verticalEdges && !horizontalEdges) { 13090 // Step 3, draw the content 13091 if (!dirtyOpaque) onDraw(canvas); 13092 13093 // Step 4, draw the children 13094 dispatchDraw(canvas); 13095 13096 // Step 6, draw decorations (scrollbars) 13097 onDrawScrollBars(canvas); 13098 13099 // we're done... 13100 return; 13101 } 13102 13103 /* 13104 * Here we do the full fledged routine... 13105 * (this is an uncommon case where speed matters less, 13106 * this is why we repeat some of the tests that have been 13107 * done above) 13108 */ 13109 13110 boolean drawTop = false; 13111 boolean drawBottom = false; 13112 boolean drawLeft = false; 13113 boolean drawRight = false; 13114 13115 float topFadeStrength = 0.0f; 13116 float bottomFadeStrength = 0.0f; 13117 float leftFadeStrength = 0.0f; 13118 float rightFadeStrength = 0.0f; 13119 13120 // Step 2, save the canvas' layers 13121 int paddingLeft = mPaddingLeft; 13122 13123 final boolean offsetRequired = isPaddingOffsetRequired(); 13124 if (offsetRequired) { 13125 paddingLeft += getLeftPaddingOffset(); 13126 } 13127 13128 int left = mScrollX + paddingLeft; 13129 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13130 int top = mScrollY + getFadeTop(offsetRequired); 13131 int bottom = top + getFadeHeight(offsetRequired); 13132 13133 if (offsetRequired) { 13134 right += getRightPaddingOffset(); 13135 bottom += getBottomPaddingOffset(); 13136 } 13137 13138 final ScrollabilityCache scrollabilityCache = mScrollCache; 13139 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13140 int length = (int) fadeHeight; 13141 13142 // clip the fade length if top and bottom fades overlap 13143 // overlapping fades produce odd-looking artifacts 13144 if (verticalEdges && (top + length > bottom - length)) { 13145 length = (bottom - top) / 2; 13146 } 13147 13148 // also clip horizontal fades if necessary 13149 if (horizontalEdges && (left + length > right - length)) { 13150 length = (right - left) / 2; 13151 } 13152 13153 if (verticalEdges) { 13154 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13155 drawTop = topFadeStrength * fadeHeight > 1.0f; 13156 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13157 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13158 } 13159 13160 if (horizontalEdges) { 13161 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13162 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13163 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13164 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13165 } 13166 13167 saveCount = canvas.getSaveCount(); 13168 13169 int solidColor = getSolidColor(); 13170 if (solidColor == 0) { 13171 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13172 13173 if (drawTop) { 13174 canvas.saveLayer(left, top, right, top + length, null, flags); 13175 } 13176 13177 if (drawBottom) { 13178 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13179 } 13180 13181 if (drawLeft) { 13182 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13183 } 13184 13185 if (drawRight) { 13186 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13187 } 13188 } else { 13189 scrollabilityCache.setFadeColor(solidColor); 13190 } 13191 13192 // Step 3, draw the content 13193 if (!dirtyOpaque) onDraw(canvas); 13194 13195 // Step 4, draw the children 13196 dispatchDraw(canvas); 13197 13198 // Step 5, draw the fade effect and restore layers 13199 final Paint p = scrollabilityCache.paint; 13200 final Matrix matrix = scrollabilityCache.matrix; 13201 final Shader fade = scrollabilityCache.shader; 13202 13203 if (drawTop) { 13204 matrix.setScale(1, fadeHeight * topFadeStrength); 13205 matrix.postTranslate(left, top); 13206 fade.setLocalMatrix(matrix); 13207 canvas.drawRect(left, top, right, top + length, p); 13208 } 13209 13210 if (drawBottom) { 13211 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13212 matrix.postRotate(180); 13213 matrix.postTranslate(left, bottom); 13214 fade.setLocalMatrix(matrix); 13215 canvas.drawRect(left, bottom - length, right, bottom, p); 13216 } 13217 13218 if (drawLeft) { 13219 matrix.setScale(1, fadeHeight * leftFadeStrength); 13220 matrix.postRotate(-90); 13221 matrix.postTranslate(left, top); 13222 fade.setLocalMatrix(matrix); 13223 canvas.drawRect(left, top, left + length, bottom, p); 13224 } 13225 13226 if (drawRight) { 13227 matrix.setScale(1, fadeHeight * rightFadeStrength); 13228 matrix.postRotate(90); 13229 matrix.postTranslate(right, top); 13230 fade.setLocalMatrix(matrix); 13231 canvas.drawRect(right - length, top, right, bottom, p); 13232 } 13233 13234 canvas.restoreToCount(saveCount); 13235 13236 // Step 6, draw decorations (scrollbars) 13237 onDrawScrollBars(canvas); 13238 } 13239 13240 /** 13241 * Override this if your view is known to always be drawn on top of a solid color background, 13242 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13243 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13244 * should be set to 0xFF. 13245 * 13246 * @see #setVerticalFadingEdgeEnabled(boolean) 13247 * @see #setHorizontalFadingEdgeEnabled(boolean) 13248 * 13249 * @return The known solid color background for this view, or 0 if the color may vary 13250 */ 13251 @ViewDebug.ExportedProperty(category = "drawing") 13252 public int getSolidColor() { 13253 return 0; 13254 } 13255 13256 /** 13257 * Build a human readable string representation of the specified view flags. 13258 * 13259 * @param flags the view flags to convert to a string 13260 * @return a String representing the supplied flags 13261 */ 13262 private static String printFlags(int flags) { 13263 String output = ""; 13264 int numFlags = 0; 13265 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13266 output += "TAKES_FOCUS"; 13267 numFlags++; 13268 } 13269 13270 switch (flags & VISIBILITY_MASK) { 13271 case INVISIBLE: 13272 if (numFlags > 0) { 13273 output += " "; 13274 } 13275 output += "INVISIBLE"; 13276 // USELESS HERE numFlags++; 13277 break; 13278 case GONE: 13279 if (numFlags > 0) { 13280 output += " "; 13281 } 13282 output += "GONE"; 13283 // USELESS HERE numFlags++; 13284 break; 13285 default: 13286 break; 13287 } 13288 return output; 13289 } 13290 13291 /** 13292 * Build a human readable string representation of the specified private 13293 * view flags. 13294 * 13295 * @param privateFlags the private view flags to convert to a string 13296 * @return a String representing the supplied flags 13297 */ 13298 private static String printPrivateFlags(int privateFlags) { 13299 String output = ""; 13300 int numFlags = 0; 13301 13302 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13303 output += "WANTS_FOCUS"; 13304 numFlags++; 13305 } 13306 13307 if ((privateFlags & FOCUSED) == FOCUSED) { 13308 if (numFlags > 0) { 13309 output += " "; 13310 } 13311 output += "FOCUSED"; 13312 numFlags++; 13313 } 13314 13315 if ((privateFlags & SELECTED) == SELECTED) { 13316 if (numFlags > 0) { 13317 output += " "; 13318 } 13319 output += "SELECTED"; 13320 numFlags++; 13321 } 13322 13323 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13324 if (numFlags > 0) { 13325 output += " "; 13326 } 13327 output += "IS_ROOT_NAMESPACE"; 13328 numFlags++; 13329 } 13330 13331 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13332 if (numFlags > 0) { 13333 output += " "; 13334 } 13335 output += "HAS_BOUNDS"; 13336 numFlags++; 13337 } 13338 13339 if ((privateFlags & DRAWN) == DRAWN) { 13340 if (numFlags > 0) { 13341 output += " "; 13342 } 13343 output += "DRAWN"; 13344 // USELESS HERE numFlags++; 13345 } 13346 return output; 13347 } 13348 13349 /** 13350 * <p>Indicates whether or not this view's layout will be requested during 13351 * the next hierarchy layout pass.</p> 13352 * 13353 * @return true if the layout will be forced during next layout pass 13354 */ 13355 public boolean isLayoutRequested() { 13356 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13357 } 13358 13359 /** 13360 * Assign a size and position to a view and all of its 13361 * descendants 13362 * 13363 * <p>This is the second phase of the layout mechanism. 13364 * (The first is measuring). In this phase, each parent calls 13365 * layout on all of its children to position them. 13366 * This is typically done using the child measurements 13367 * that were stored in the measure pass().</p> 13368 * 13369 * <p>Derived classes should not override this method. 13370 * Derived classes with children should override 13371 * onLayout. In that method, they should 13372 * call layout on each of their children.</p> 13373 * 13374 * @param l Left position, relative to parent 13375 * @param t Top position, relative to parent 13376 * @param r Right position, relative to parent 13377 * @param b Bottom position, relative to parent 13378 */ 13379 @SuppressWarnings({"unchecked"}) 13380 public void layout(int l, int t, int r, int b) { 13381 int oldL = mLeft; 13382 int oldT = mTop; 13383 int oldB = mBottom; 13384 int oldR = mRight; 13385 boolean changed = setFrame(l, t, r, b); 13386 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13387 if (ViewDebug.TRACE_HIERARCHY) { 13388 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 13389 } 13390 13391 onLayout(changed, l, t, r, b); 13392 mPrivateFlags &= ~LAYOUT_REQUIRED; 13393 13394 ListenerInfo li = mListenerInfo; 13395 if (li != null && li.mOnLayoutChangeListeners != null) { 13396 ArrayList<OnLayoutChangeListener> listenersCopy = 13397 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13398 int numListeners = listenersCopy.size(); 13399 for (int i = 0; i < numListeners; ++i) { 13400 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13401 } 13402 } 13403 } 13404 mPrivateFlags &= ~FORCE_LAYOUT; 13405 } 13406 13407 /** 13408 * Called from layout when this view should 13409 * assign a size and position to each of its children. 13410 * 13411 * Derived classes with children should override 13412 * this method and call layout on each of 13413 * their children. 13414 * @param changed This is a new size or position for this view 13415 * @param left Left position, relative to parent 13416 * @param top Top position, relative to parent 13417 * @param right Right position, relative to parent 13418 * @param bottom Bottom position, relative to parent 13419 */ 13420 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13421 } 13422 13423 /** 13424 * Assign a size and position to this view. 13425 * 13426 * This is called from layout. 13427 * 13428 * @param left Left position, relative to parent 13429 * @param top Top position, relative to parent 13430 * @param right Right position, relative to parent 13431 * @param bottom Bottom position, relative to parent 13432 * @return true if the new size and position are different than the 13433 * previous ones 13434 * {@hide} 13435 */ 13436 protected boolean setFrame(int left, int top, int right, int bottom) { 13437 boolean changed = false; 13438 13439 if (DBG) { 13440 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13441 + right + "," + bottom + ")"); 13442 } 13443 13444 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13445 changed = true; 13446 13447 // Remember our drawn bit 13448 int drawn = mPrivateFlags & DRAWN; 13449 13450 int oldWidth = mRight - mLeft; 13451 int oldHeight = mBottom - mTop; 13452 int newWidth = right - left; 13453 int newHeight = bottom - top; 13454 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13455 13456 // Invalidate our old position 13457 invalidate(sizeChanged); 13458 13459 mLeft = left; 13460 mTop = top; 13461 mRight = right; 13462 mBottom = bottom; 13463 if (mDisplayList != null) { 13464 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13465 } 13466 13467 mPrivateFlags |= HAS_BOUNDS; 13468 13469 13470 if (sizeChanged) { 13471 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13472 // A change in dimension means an auto-centered pivot point changes, too 13473 if (mTransformationInfo != null) { 13474 mTransformationInfo.mMatrixDirty = true; 13475 } 13476 } 13477 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13478 } 13479 13480 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13481 // If we are visible, force the DRAWN bit to on so that 13482 // this invalidate will go through (at least to our parent). 13483 // This is because someone may have invalidated this view 13484 // before this call to setFrame came in, thereby clearing 13485 // the DRAWN bit. 13486 mPrivateFlags |= DRAWN; 13487 invalidate(sizeChanged); 13488 // parent display list may need to be recreated based on a change in the bounds 13489 // of any child 13490 invalidateParentCaches(); 13491 } 13492 13493 // Reset drawn bit to original value (invalidate turns it off) 13494 mPrivateFlags |= drawn; 13495 13496 mBackgroundSizeChanged = true; 13497 } 13498 return changed; 13499 } 13500 13501 /** 13502 * Finalize inflating a view from XML. This is called as the last phase 13503 * of inflation, after all child views have been added. 13504 * 13505 * <p>Even if the subclass overrides onFinishInflate, they should always be 13506 * sure to call the super method, so that we get called. 13507 */ 13508 protected void onFinishInflate() { 13509 } 13510 13511 /** 13512 * Returns the resources associated with this view. 13513 * 13514 * @return Resources object. 13515 */ 13516 public Resources getResources() { 13517 return mResources; 13518 } 13519 13520 /** 13521 * Invalidates the specified Drawable. 13522 * 13523 * @param drawable the drawable to invalidate 13524 */ 13525 public void invalidateDrawable(Drawable drawable) { 13526 if (verifyDrawable(drawable)) { 13527 final Rect dirty = drawable.getBounds(); 13528 final int scrollX = mScrollX; 13529 final int scrollY = mScrollY; 13530 13531 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13532 dirty.right + scrollX, dirty.bottom + scrollY); 13533 } 13534 } 13535 13536 /** 13537 * Schedules an action on a drawable to occur at a specified time. 13538 * 13539 * @param who the recipient of the action 13540 * @param what the action to run on the drawable 13541 * @param when the time at which the action must occur. Uses the 13542 * {@link SystemClock#uptimeMillis} timebase. 13543 */ 13544 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13545 if (verifyDrawable(who) && what != null) { 13546 final long delay = when - SystemClock.uptimeMillis(); 13547 if (mAttachInfo != null) { 13548 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13549 Choreographer.CALLBACK_ANIMATION, what, who, 13550 Choreographer.subtractFrameDelay(delay)); 13551 } else { 13552 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13553 } 13554 } 13555 } 13556 13557 /** 13558 * Cancels a scheduled action on a drawable. 13559 * 13560 * @param who the recipient of the action 13561 * @param what the action to cancel 13562 */ 13563 public void unscheduleDrawable(Drawable who, Runnable what) { 13564 if (verifyDrawable(who) && what != null) { 13565 if (mAttachInfo != null) { 13566 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13567 Choreographer.CALLBACK_ANIMATION, what, who); 13568 } else { 13569 ViewRootImpl.getRunQueue().removeCallbacks(what); 13570 } 13571 } 13572 } 13573 13574 /** 13575 * Unschedule any events associated with the given Drawable. This can be 13576 * used when selecting a new Drawable into a view, so that the previous 13577 * one is completely unscheduled. 13578 * 13579 * @param who The Drawable to unschedule. 13580 * 13581 * @see #drawableStateChanged 13582 */ 13583 public void unscheduleDrawable(Drawable who) { 13584 if (mAttachInfo != null && who != null) { 13585 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13586 Choreographer.CALLBACK_ANIMATION, null, who); 13587 } 13588 } 13589 13590 /** 13591 * Return the layout direction of a given Drawable. 13592 * 13593 * @param who the Drawable to query 13594 * @hide 13595 */ 13596 public int getResolvedLayoutDirection(Drawable who) { 13597 return (who == mBackground) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 13598 } 13599 13600 /** 13601 * If your view subclass is displaying its own Drawable objects, it should 13602 * override this function and return true for any Drawable it is 13603 * displaying. This allows animations for those drawables to be 13604 * scheduled. 13605 * 13606 * <p>Be sure to call through to the super class when overriding this 13607 * function. 13608 * 13609 * @param who The Drawable to verify. Return true if it is one you are 13610 * displaying, else return the result of calling through to the 13611 * super class. 13612 * 13613 * @return boolean If true than the Drawable is being displayed in the 13614 * view; else false and it is not allowed to animate. 13615 * 13616 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13617 * @see #drawableStateChanged() 13618 */ 13619 protected boolean verifyDrawable(Drawable who) { 13620 return who == mBackground; 13621 } 13622 13623 /** 13624 * This function is called whenever the state of the view changes in such 13625 * a way that it impacts the state of drawables being shown. 13626 * 13627 * <p>Be sure to call through to the superclass when overriding this 13628 * function. 13629 * 13630 * @see Drawable#setState(int[]) 13631 */ 13632 protected void drawableStateChanged() { 13633 Drawable d = mBackground; 13634 if (d != null && d.isStateful()) { 13635 d.setState(getDrawableState()); 13636 } 13637 } 13638 13639 /** 13640 * Call this to force a view to update its drawable state. This will cause 13641 * drawableStateChanged to be called on this view. Views that are interested 13642 * in the new state should call getDrawableState. 13643 * 13644 * @see #drawableStateChanged 13645 * @see #getDrawableState 13646 */ 13647 public void refreshDrawableState() { 13648 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13649 drawableStateChanged(); 13650 13651 ViewParent parent = mParent; 13652 if (parent != null) { 13653 parent.childDrawableStateChanged(this); 13654 } 13655 } 13656 13657 /** 13658 * Return an array of resource IDs of the drawable states representing the 13659 * current state of the view. 13660 * 13661 * @return The current drawable state 13662 * 13663 * @see Drawable#setState(int[]) 13664 * @see #drawableStateChanged() 13665 * @see #onCreateDrawableState(int) 13666 */ 13667 public final int[] getDrawableState() { 13668 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13669 return mDrawableState; 13670 } else { 13671 mDrawableState = onCreateDrawableState(0); 13672 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13673 return mDrawableState; 13674 } 13675 } 13676 13677 /** 13678 * Generate the new {@link android.graphics.drawable.Drawable} state for 13679 * this view. This is called by the view 13680 * system when the cached Drawable state is determined to be invalid. To 13681 * retrieve the current state, you should use {@link #getDrawableState}. 13682 * 13683 * @param extraSpace if non-zero, this is the number of extra entries you 13684 * would like in the returned array in which you can place your own 13685 * states. 13686 * 13687 * @return Returns an array holding the current {@link Drawable} state of 13688 * the view. 13689 * 13690 * @see #mergeDrawableStates(int[], int[]) 13691 */ 13692 protected int[] onCreateDrawableState(int extraSpace) { 13693 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13694 mParent instanceof View) { 13695 return ((View) mParent).onCreateDrawableState(extraSpace); 13696 } 13697 13698 int[] drawableState; 13699 13700 int privateFlags = mPrivateFlags; 13701 13702 int viewStateIndex = 0; 13703 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13704 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13705 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13706 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13707 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13708 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13709 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13710 HardwareRenderer.isAvailable()) { 13711 // This is set if HW acceleration is requested, even if the current 13712 // process doesn't allow it. This is just to allow app preview 13713 // windows to better match their app. 13714 viewStateIndex |= VIEW_STATE_ACCELERATED; 13715 } 13716 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13717 13718 final int privateFlags2 = mPrivateFlags2; 13719 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13720 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13721 13722 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13723 13724 //noinspection ConstantIfStatement 13725 if (false) { 13726 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13727 Log.i("View", toString() 13728 + " pressed=" + ((privateFlags & PRESSED) != 0) 13729 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13730 + " fo=" + hasFocus() 13731 + " sl=" + ((privateFlags & SELECTED) != 0) 13732 + " wf=" + hasWindowFocus() 13733 + ": " + Arrays.toString(drawableState)); 13734 } 13735 13736 if (extraSpace == 0) { 13737 return drawableState; 13738 } 13739 13740 final int[] fullState; 13741 if (drawableState != null) { 13742 fullState = new int[drawableState.length + extraSpace]; 13743 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13744 } else { 13745 fullState = new int[extraSpace]; 13746 } 13747 13748 return fullState; 13749 } 13750 13751 /** 13752 * Merge your own state values in <var>additionalState</var> into the base 13753 * state values <var>baseState</var> that were returned by 13754 * {@link #onCreateDrawableState(int)}. 13755 * 13756 * @param baseState The base state values returned by 13757 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13758 * own additional state values. 13759 * 13760 * @param additionalState The additional state values you would like 13761 * added to <var>baseState</var>; this array is not modified. 13762 * 13763 * @return As a convenience, the <var>baseState</var> array you originally 13764 * passed into the function is returned. 13765 * 13766 * @see #onCreateDrawableState(int) 13767 */ 13768 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13769 final int N = baseState.length; 13770 int i = N - 1; 13771 while (i >= 0 && baseState[i] == 0) { 13772 i--; 13773 } 13774 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13775 return baseState; 13776 } 13777 13778 /** 13779 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13780 * on all Drawable objects associated with this view. 13781 */ 13782 public void jumpDrawablesToCurrentState() { 13783 if (mBackground != null) { 13784 mBackground.jumpToCurrentState(); 13785 } 13786 } 13787 13788 /** 13789 * Sets the background color for this view. 13790 * @param color the color of the background 13791 */ 13792 @RemotableViewMethod 13793 public void setBackgroundColor(int color) { 13794 if (mBackground instanceof ColorDrawable) { 13795 ((ColorDrawable) mBackground).setColor(color); 13796 } else { 13797 setBackground(new ColorDrawable(color)); 13798 } 13799 } 13800 13801 /** 13802 * Set the background to a given resource. The resource should refer to 13803 * a Drawable object or 0 to remove the background. 13804 * @param resid The identifier of the resource. 13805 * 13806 * @attr ref android.R.styleable#View_background 13807 */ 13808 @RemotableViewMethod 13809 public void setBackgroundResource(int resid) { 13810 if (resid != 0 && resid == mBackgroundResource) { 13811 return; 13812 } 13813 13814 Drawable d= null; 13815 if (resid != 0) { 13816 d = mResources.getDrawable(resid); 13817 } 13818 setBackground(d); 13819 13820 mBackgroundResource = resid; 13821 } 13822 13823 /** 13824 * Set the background to a given Drawable, or remove the background. If the 13825 * background has padding, this View's padding is set to the background's 13826 * padding. However, when a background is removed, this View's padding isn't 13827 * touched. If setting the padding is desired, please use 13828 * {@link #setPadding(int, int, int, int)}. 13829 * 13830 * @param background The Drawable to use as the background, or null to remove the 13831 * background 13832 */ 13833 public void setBackground(Drawable background) { 13834 //noinspection deprecation 13835 setBackgroundDrawable(background); 13836 } 13837 13838 /** 13839 * @deprecated use {@link #setBackground(Drawable)} instead 13840 */ 13841 @Deprecated 13842 public void setBackgroundDrawable(Drawable background) { 13843 if (background == mBackground) { 13844 return; 13845 } 13846 13847 boolean requestLayout = false; 13848 13849 mBackgroundResource = 0; 13850 13851 /* 13852 * Regardless of whether we're setting a new background or not, we want 13853 * to clear the previous drawable. 13854 */ 13855 if (mBackground != null) { 13856 mBackground.setCallback(null); 13857 unscheduleDrawable(mBackground); 13858 } 13859 13860 if (background != null) { 13861 Rect padding = sThreadLocal.get(); 13862 if (padding == null) { 13863 padding = new Rect(); 13864 sThreadLocal.set(padding); 13865 } 13866 if (background.getPadding(padding)) { 13867 switch (background.getResolvedLayoutDirectionSelf()) { 13868 case LAYOUT_DIRECTION_RTL: 13869 setPadding(padding.right, padding.top, padding.left, padding.bottom); 13870 break; 13871 case LAYOUT_DIRECTION_LTR: 13872 default: 13873 setPadding(padding.left, padding.top, padding.right, padding.bottom); 13874 } 13875 } 13876 13877 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 13878 // if it has a different minimum size, we should layout again 13879 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 13880 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 13881 requestLayout = true; 13882 } 13883 13884 background.setCallback(this); 13885 if (background.isStateful()) { 13886 background.setState(getDrawableState()); 13887 } 13888 background.setVisible(getVisibility() == VISIBLE, false); 13889 mBackground = background; 13890 13891 if ((mPrivateFlags & SKIP_DRAW) != 0) { 13892 mPrivateFlags &= ~SKIP_DRAW; 13893 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 13894 requestLayout = true; 13895 } 13896 } else { 13897 /* Remove the background */ 13898 mBackground = null; 13899 13900 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 13901 /* 13902 * This view ONLY drew the background before and we're removing 13903 * the background, so now it won't draw anything 13904 * (hence we SKIP_DRAW) 13905 */ 13906 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 13907 mPrivateFlags |= SKIP_DRAW; 13908 } 13909 13910 /* 13911 * When the background is set, we try to apply its padding to this 13912 * View. When the background is removed, we don't touch this View's 13913 * padding. This is noted in the Javadocs. Hence, we don't need to 13914 * requestLayout(), the invalidate() below is sufficient. 13915 */ 13916 13917 // The old background's minimum size could have affected this 13918 // View's layout, so let's requestLayout 13919 requestLayout = true; 13920 } 13921 13922 computeOpaqueFlags(); 13923 13924 if (requestLayout) { 13925 requestLayout(); 13926 } 13927 13928 mBackgroundSizeChanged = true; 13929 invalidate(true); 13930 } 13931 13932 /** 13933 * Gets the background drawable 13934 * 13935 * @return The drawable used as the background for this view, if any. 13936 * 13937 * @see #setBackground(Drawable) 13938 * 13939 * @attr ref android.R.styleable#View_background 13940 */ 13941 public Drawable getBackground() { 13942 return mBackground; 13943 } 13944 13945 /** 13946 * Sets the padding. The view may add on the space required to display 13947 * the scrollbars, depending on the style and visibility of the scrollbars. 13948 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 13949 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 13950 * from the values set in this call. 13951 * 13952 * @attr ref android.R.styleable#View_padding 13953 * @attr ref android.R.styleable#View_paddingBottom 13954 * @attr ref android.R.styleable#View_paddingLeft 13955 * @attr ref android.R.styleable#View_paddingRight 13956 * @attr ref android.R.styleable#View_paddingTop 13957 * @param left the left padding in pixels 13958 * @param top the top padding in pixels 13959 * @param right the right padding in pixels 13960 * @param bottom the bottom padding in pixels 13961 */ 13962 public void setPadding(int left, int top, int right, int bottom) { 13963 mUserPaddingStart = -1; 13964 mUserPaddingEnd = -1; 13965 mUserPaddingRelative = false; 13966 13967 internalSetPadding(left, top, right, bottom); 13968 } 13969 13970 private void internalSetPadding(int left, int top, int right, int bottom) { 13971 mUserPaddingLeft = left; 13972 mUserPaddingRight = right; 13973 mUserPaddingBottom = bottom; 13974 13975 final int viewFlags = mViewFlags; 13976 boolean changed = false; 13977 13978 // Common case is there are no scroll bars. 13979 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 13980 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 13981 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 13982 ? 0 : getVerticalScrollbarWidth(); 13983 switch (mVerticalScrollbarPosition) { 13984 case SCROLLBAR_POSITION_DEFAULT: 13985 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 13986 left += offset; 13987 } else { 13988 right += offset; 13989 } 13990 break; 13991 case SCROLLBAR_POSITION_RIGHT: 13992 right += offset; 13993 break; 13994 case SCROLLBAR_POSITION_LEFT: 13995 left += offset; 13996 break; 13997 } 13998 } 13999 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14000 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14001 ? 0 : getHorizontalScrollbarHeight(); 14002 } 14003 } 14004 14005 if (mPaddingLeft != left) { 14006 changed = true; 14007 mPaddingLeft = left; 14008 } 14009 if (mPaddingTop != top) { 14010 changed = true; 14011 mPaddingTop = top; 14012 } 14013 if (mPaddingRight != right) { 14014 changed = true; 14015 mPaddingRight = right; 14016 } 14017 if (mPaddingBottom != bottom) { 14018 changed = true; 14019 mPaddingBottom = bottom; 14020 } 14021 14022 if (changed) { 14023 requestLayout(); 14024 } 14025 } 14026 14027 /** 14028 * Sets the relative padding. The view may add on the space required to display 14029 * the scrollbars, depending on the style and visibility of the scrollbars. 14030 * from the values set in this call. 14031 * 14032 * @param start the start padding in pixels 14033 * @param top the top padding in pixels 14034 * @param end the end padding in pixels 14035 * @param bottom the bottom padding in pixels 14036 * @hide 14037 */ 14038 public void setPaddingRelative(int start, int top, int end, int bottom) { 14039 mUserPaddingStart = start; 14040 mUserPaddingEnd = end; 14041 mUserPaddingRelative = true; 14042 14043 switch(getResolvedLayoutDirection()) { 14044 case LAYOUT_DIRECTION_RTL: 14045 internalSetPadding(end, top, start, bottom); 14046 break; 14047 case LAYOUT_DIRECTION_LTR: 14048 default: 14049 internalSetPadding(start, top, end, bottom); 14050 } 14051 } 14052 14053 /** 14054 * Returns the top padding of this view. 14055 * 14056 * @return the top padding in pixels 14057 */ 14058 public int getPaddingTop() { 14059 return mPaddingTop; 14060 } 14061 14062 /** 14063 * Returns the bottom padding of this view. If there are inset and enabled 14064 * scrollbars, this value may include the space required to display the 14065 * scrollbars as well. 14066 * 14067 * @return the bottom padding in pixels 14068 */ 14069 public int getPaddingBottom() { 14070 return mPaddingBottom; 14071 } 14072 14073 /** 14074 * Returns the left padding of this view. If there are inset and enabled 14075 * scrollbars, this value may include the space required to display the 14076 * scrollbars as well. 14077 * 14078 * @return the left padding in pixels 14079 */ 14080 public int getPaddingLeft() { 14081 return mPaddingLeft; 14082 } 14083 14084 /** 14085 * Returns the start padding of this view depending on its resolved layout direction. 14086 * If there are inset and enabled scrollbars, this value may include the space 14087 * required to display the scrollbars as well. 14088 * 14089 * @return the start padding in pixels 14090 * @hide 14091 */ 14092 public int getPaddingStart() { 14093 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14094 mPaddingRight : mPaddingLeft; 14095 } 14096 14097 /** 14098 * Returns the right padding of this view. If there are inset and enabled 14099 * scrollbars, this value may include the space required to display the 14100 * scrollbars as well. 14101 * 14102 * @return the right padding in pixels 14103 */ 14104 public int getPaddingRight() { 14105 return mPaddingRight; 14106 } 14107 14108 /** 14109 * Returns the end padding of this view depending on its resolved layout direction. 14110 * If there are inset and enabled scrollbars, this value may include the space 14111 * required to display the scrollbars as well. 14112 * 14113 * @return the end padding in pixels 14114 * @hide 14115 */ 14116 public int getPaddingEnd() { 14117 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14118 mPaddingLeft : mPaddingRight; 14119 } 14120 14121 /** 14122 * Return if the padding as been set thru relative values 14123 * {@link #setPaddingRelative(int, int, int, int)} 14124 * 14125 * @return true if the padding is relative or false if it is not. 14126 * @hide 14127 */ 14128 public boolean isPaddingRelative() { 14129 return mUserPaddingRelative; 14130 } 14131 14132 /** 14133 * @hide 14134 */ 14135 public Insets getOpticalInsets() { 14136 if (mLayoutInsets == null) { 14137 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 14138 } 14139 return mLayoutInsets; 14140 } 14141 14142 /** 14143 * @hide 14144 */ 14145 public void setLayoutInsets(Insets layoutInsets) { 14146 mLayoutInsets = layoutInsets; 14147 } 14148 14149 /** 14150 * Changes the selection state of this view. A view can be selected or not. 14151 * Note that selection is not the same as focus. Views are typically 14152 * selected in the context of an AdapterView like ListView or GridView; 14153 * the selected view is the view that is highlighted. 14154 * 14155 * @param selected true if the view must be selected, false otherwise 14156 */ 14157 public void setSelected(boolean selected) { 14158 if (((mPrivateFlags & SELECTED) != 0) != selected) { 14159 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 14160 if (!selected) resetPressedState(); 14161 invalidate(true); 14162 refreshDrawableState(); 14163 dispatchSetSelected(selected); 14164 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14165 notifyAccessibilityStateChanged(); 14166 } 14167 } 14168 } 14169 14170 /** 14171 * Dispatch setSelected to all of this View's children. 14172 * 14173 * @see #setSelected(boolean) 14174 * 14175 * @param selected The new selected state 14176 */ 14177 protected void dispatchSetSelected(boolean selected) { 14178 } 14179 14180 /** 14181 * Indicates the selection state of this view. 14182 * 14183 * @return true if the view is selected, false otherwise 14184 */ 14185 @ViewDebug.ExportedProperty 14186 public boolean isSelected() { 14187 return (mPrivateFlags & SELECTED) != 0; 14188 } 14189 14190 /** 14191 * Changes the activated state of this view. A view can be activated or not. 14192 * Note that activation is not the same as selection. Selection is 14193 * a transient property, representing the view (hierarchy) the user is 14194 * currently interacting with. Activation is a longer-term state that the 14195 * user can move views in and out of. For example, in a list view with 14196 * single or multiple selection enabled, the views in the current selection 14197 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14198 * here.) The activated state is propagated down to children of the view it 14199 * is set on. 14200 * 14201 * @param activated true if the view must be activated, false otherwise 14202 */ 14203 public void setActivated(boolean activated) { 14204 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 14205 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 14206 invalidate(true); 14207 refreshDrawableState(); 14208 dispatchSetActivated(activated); 14209 } 14210 } 14211 14212 /** 14213 * Dispatch setActivated to all of this View's children. 14214 * 14215 * @see #setActivated(boolean) 14216 * 14217 * @param activated The new activated state 14218 */ 14219 protected void dispatchSetActivated(boolean activated) { 14220 } 14221 14222 /** 14223 * Indicates the activation state of this view. 14224 * 14225 * @return true if the view is activated, false otherwise 14226 */ 14227 @ViewDebug.ExportedProperty 14228 public boolean isActivated() { 14229 return (mPrivateFlags & ACTIVATED) != 0; 14230 } 14231 14232 /** 14233 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14234 * observer can be used to get notifications when global events, like 14235 * layout, happen. 14236 * 14237 * The returned ViewTreeObserver observer is not guaranteed to remain 14238 * valid for the lifetime of this View. If the caller of this method keeps 14239 * a long-lived reference to ViewTreeObserver, it should always check for 14240 * the return value of {@link ViewTreeObserver#isAlive()}. 14241 * 14242 * @return The ViewTreeObserver for this view's hierarchy. 14243 */ 14244 public ViewTreeObserver getViewTreeObserver() { 14245 if (mAttachInfo != null) { 14246 return mAttachInfo.mTreeObserver; 14247 } 14248 if (mFloatingTreeObserver == null) { 14249 mFloatingTreeObserver = new ViewTreeObserver(); 14250 } 14251 return mFloatingTreeObserver; 14252 } 14253 14254 /** 14255 * <p>Finds the topmost view in the current view hierarchy.</p> 14256 * 14257 * @return the topmost view containing this view 14258 */ 14259 public View getRootView() { 14260 if (mAttachInfo != null) { 14261 final View v = mAttachInfo.mRootView; 14262 if (v != null) { 14263 return v; 14264 } 14265 } 14266 14267 View parent = this; 14268 14269 while (parent.mParent != null && parent.mParent instanceof View) { 14270 parent = (View) parent.mParent; 14271 } 14272 14273 return parent; 14274 } 14275 14276 /** 14277 * <p>Computes the coordinates of this view on the screen. The argument 14278 * must be an array of two integers. After the method returns, the array 14279 * contains the x and y location in that order.</p> 14280 * 14281 * @param location an array of two integers in which to hold the coordinates 14282 */ 14283 public void getLocationOnScreen(int[] location) { 14284 getLocationInWindow(location); 14285 14286 final AttachInfo info = mAttachInfo; 14287 if (info != null) { 14288 location[0] += info.mWindowLeft; 14289 location[1] += info.mWindowTop; 14290 } 14291 } 14292 14293 /** 14294 * <p>Computes the coordinates of this view in its window. The argument 14295 * must be an array of two integers. After the method returns, the array 14296 * contains the x and y location in that order.</p> 14297 * 14298 * @param location an array of two integers in which to hold the coordinates 14299 */ 14300 public void getLocationInWindow(int[] location) { 14301 if (location == null || location.length < 2) { 14302 throw new IllegalArgumentException("location must be an array of two integers"); 14303 } 14304 14305 if (mAttachInfo == null) { 14306 // When the view is not attached to a window, this method does not make sense 14307 location[0] = location[1] = 0; 14308 return; 14309 } 14310 14311 float[] position = mAttachInfo.mTmpTransformLocation; 14312 position[0] = position[1] = 0.0f; 14313 14314 if (!hasIdentityMatrix()) { 14315 getMatrix().mapPoints(position); 14316 } 14317 14318 position[0] += mLeft; 14319 position[1] += mTop; 14320 14321 ViewParent viewParent = mParent; 14322 while (viewParent instanceof View) { 14323 final View view = (View) viewParent; 14324 14325 position[0] -= view.mScrollX; 14326 position[1] -= view.mScrollY; 14327 14328 if (!view.hasIdentityMatrix()) { 14329 view.getMatrix().mapPoints(position); 14330 } 14331 14332 position[0] += view.mLeft; 14333 position[1] += view.mTop; 14334 14335 viewParent = view.mParent; 14336 } 14337 14338 if (viewParent instanceof ViewRootImpl) { 14339 // *cough* 14340 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14341 position[1] -= vr.mCurScrollY; 14342 } 14343 14344 location[0] = (int) (position[0] + 0.5f); 14345 location[1] = (int) (position[1] + 0.5f); 14346 } 14347 14348 /** 14349 * {@hide} 14350 * @param id the id of the view to be found 14351 * @return the view of the specified id, null if cannot be found 14352 */ 14353 protected View findViewTraversal(int id) { 14354 if (id == mID) { 14355 return this; 14356 } 14357 return null; 14358 } 14359 14360 /** 14361 * {@hide} 14362 * @param tag the tag of the view to be found 14363 * @return the view of specified tag, null if cannot be found 14364 */ 14365 protected View findViewWithTagTraversal(Object tag) { 14366 if (tag != null && tag.equals(mTag)) { 14367 return this; 14368 } 14369 return null; 14370 } 14371 14372 /** 14373 * {@hide} 14374 * @param predicate The predicate to evaluate. 14375 * @param childToSkip If not null, ignores this child during the recursive traversal. 14376 * @return The first view that matches the predicate or null. 14377 */ 14378 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14379 if (predicate.apply(this)) { 14380 return this; 14381 } 14382 return null; 14383 } 14384 14385 /** 14386 * Look for a child view with the given id. If this view has the given 14387 * id, return this view. 14388 * 14389 * @param id The id to search for. 14390 * @return The view that has the given id in the hierarchy or null 14391 */ 14392 public final View findViewById(int id) { 14393 if (id < 0) { 14394 return null; 14395 } 14396 return findViewTraversal(id); 14397 } 14398 14399 /** 14400 * Finds a view by its unuque and stable accessibility id. 14401 * 14402 * @param accessibilityId The searched accessibility id. 14403 * @return The found view. 14404 */ 14405 final View findViewByAccessibilityId(int accessibilityId) { 14406 if (accessibilityId < 0) { 14407 return null; 14408 } 14409 return findViewByAccessibilityIdTraversal(accessibilityId); 14410 } 14411 14412 /** 14413 * Performs the traversal to find a view by its unuque and stable accessibility id. 14414 * 14415 * <strong>Note:</strong>This method does not stop at the root namespace 14416 * boundary since the user can touch the screen at an arbitrary location 14417 * potentially crossing the root namespace bounday which will send an 14418 * accessibility event to accessibility services and they should be able 14419 * to obtain the event source. Also accessibility ids are guaranteed to be 14420 * unique in the window. 14421 * 14422 * @param accessibilityId The accessibility id. 14423 * @return The found view. 14424 */ 14425 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14426 if (getAccessibilityViewId() == accessibilityId) { 14427 return this; 14428 } 14429 return null; 14430 } 14431 14432 /** 14433 * Look for a child view with the given tag. If this view has the given 14434 * tag, return this view. 14435 * 14436 * @param tag The tag to search for, using "tag.equals(getTag())". 14437 * @return The View that has the given tag in the hierarchy or null 14438 */ 14439 public final View findViewWithTag(Object tag) { 14440 if (tag == null) { 14441 return null; 14442 } 14443 return findViewWithTagTraversal(tag); 14444 } 14445 14446 /** 14447 * {@hide} 14448 * Look for a child view that matches the specified predicate. 14449 * If this view matches the predicate, return this view. 14450 * 14451 * @param predicate The predicate to evaluate. 14452 * @return The first view that matches the predicate or null. 14453 */ 14454 public final View findViewByPredicate(Predicate<View> predicate) { 14455 return findViewByPredicateTraversal(predicate, null); 14456 } 14457 14458 /** 14459 * {@hide} 14460 * Look for a child view that matches the specified predicate, 14461 * starting with the specified view and its descendents and then 14462 * recusively searching the ancestors and siblings of that view 14463 * until this view is reached. 14464 * 14465 * This method is useful in cases where the predicate does not match 14466 * a single unique view (perhaps multiple views use the same id) 14467 * and we are trying to find the view that is "closest" in scope to the 14468 * starting view. 14469 * 14470 * @param start The view to start from. 14471 * @param predicate The predicate to evaluate. 14472 * @return The first view that matches the predicate or null. 14473 */ 14474 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14475 View childToSkip = null; 14476 for (;;) { 14477 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14478 if (view != null || start == this) { 14479 return view; 14480 } 14481 14482 ViewParent parent = start.getParent(); 14483 if (parent == null || !(parent instanceof View)) { 14484 return null; 14485 } 14486 14487 childToSkip = start; 14488 start = (View) parent; 14489 } 14490 } 14491 14492 /** 14493 * Sets the identifier for this view. The identifier does not have to be 14494 * unique in this view's hierarchy. The identifier should be a positive 14495 * number. 14496 * 14497 * @see #NO_ID 14498 * @see #getId() 14499 * @see #findViewById(int) 14500 * 14501 * @param id a number used to identify the view 14502 * 14503 * @attr ref android.R.styleable#View_id 14504 */ 14505 public void setId(int id) { 14506 mID = id; 14507 } 14508 14509 /** 14510 * {@hide} 14511 * 14512 * @param isRoot true if the view belongs to the root namespace, false 14513 * otherwise 14514 */ 14515 public void setIsRootNamespace(boolean isRoot) { 14516 if (isRoot) { 14517 mPrivateFlags |= IS_ROOT_NAMESPACE; 14518 } else { 14519 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14520 } 14521 } 14522 14523 /** 14524 * {@hide} 14525 * 14526 * @return true if the view belongs to the root namespace, false otherwise 14527 */ 14528 public boolean isRootNamespace() { 14529 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14530 } 14531 14532 /** 14533 * Returns this view's identifier. 14534 * 14535 * @return a positive integer used to identify the view or {@link #NO_ID} 14536 * if the view has no ID 14537 * 14538 * @see #setId(int) 14539 * @see #findViewById(int) 14540 * @attr ref android.R.styleable#View_id 14541 */ 14542 @ViewDebug.CapturedViewProperty 14543 public int getId() { 14544 return mID; 14545 } 14546 14547 /** 14548 * Returns this view's tag. 14549 * 14550 * @return the Object stored in this view as a tag 14551 * 14552 * @see #setTag(Object) 14553 * @see #getTag(int) 14554 */ 14555 @ViewDebug.ExportedProperty 14556 public Object getTag() { 14557 return mTag; 14558 } 14559 14560 /** 14561 * Sets the tag associated with this view. A tag can be used to mark 14562 * a view in its hierarchy and does not have to be unique within the 14563 * hierarchy. Tags can also be used to store data within a view without 14564 * resorting to another data structure. 14565 * 14566 * @param tag an Object to tag the view with 14567 * 14568 * @see #getTag() 14569 * @see #setTag(int, Object) 14570 */ 14571 public void setTag(final Object tag) { 14572 mTag = tag; 14573 } 14574 14575 /** 14576 * Returns the tag associated with this view and the specified key. 14577 * 14578 * @param key The key identifying the tag 14579 * 14580 * @return the Object stored in this view as a tag 14581 * 14582 * @see #setTag(int, Object) 14583 * @see #getTag() 14584 */ 14585 public Object getTag(int key) { 14586 if (mKeyedTags != null) return mKeyedTags.get(key); 14587 return null; 14588 } 14589 14590 /** 14591 * Sets a tag associated with this view and a key. A tag can be used 14592 * to mark a view in its hierarchy and does not have to be unique within 14593 * the hierarchy. Tags can also be used to store data within a view 14594 * without resorting to another data structure. 14595 * 14596 * The specified key should be an id declared in the resources of the 14597 * application to ensure it is unique (see the <a 14598 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14599 * Keys identified as belonging to 14600 * the Android framework or not associated with any package will cause 14601 * an {@link IllegalArgumentException} to be thrown. 14602 * 14603 * @param key The key identifying the tag 14604 * @param tag An Object to tag the view with 14605 * 14606 * @throws IllegalArgumentException If they specified key is not valid 14607 * 14608 * @see #setTag(Object) 14609 * @see #getTag(int) 14610 */ 14611 public void setTag(int key, final Object tag) { 14612 // If the package id is 0x00 or 0x01, it's either an undefined package 14613 // or a framework id 14614 if ((key >>> 24) < 2) { 14615 throw new IllegalArgumentException("The key must be an application-specific " 14616 + "resource id."); 14617 } 14618 14619 setKeyedTag(key, tag); 14620 } 14621 14622 /** 14623 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14624 * framework id. 14625 * 14626 * @hide 14627 */ 14628 public void setTagInternal(int key, Object tag) { 14629 if ((key >>> 24) != 0x1) { 14630 throw new IllegalArgumentException("The key must be a framework-specific " 14631 + "resource id."); 14632 } 14633 14634 setKeyedTag(key, tag); 14635 } 14636 14637 private void setKeyedTag(int key, Object tag) { 14638 if (mKeyedTags == null) { 14639 mKeyedTags = new SparseArray<Object>(); 14640 } 14641 14642 mKeyedTags.put(key, tag); 14643 } 14644 14645 /** 14646 * @param consistency The type of consistency. See ViewDebug for more information. 14647 * 14648 * @hide 14649 */ 14650 protected boolean dispatchConsistencyCheck(int consistency) { 14651 return onConsistencyCheck(consistency); 14652 } 14653 14654 /** 14655 * Method that subclasses should implement to check their consistency. The type of 14656 * consistency check is indicated by the bit field passed as a parameter. 14657 * 14658 * @param consistency The type of consistency. See ViewDebug for more information. 14659 * 14660 * @throws IllegalStateException if the view is in an inconsistent state. 14661 * 14662 * @hide 14663 */ 14664 protected boolean onConsistencyCheck(int consistency) { 14665 boolean result = true; 14666 14667 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 14668 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 14669 14670 if (checkLayout) { 14671 if (getParent() == null) { 14672 result = false; 14673 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14674 "View " + this + " does not have a parent."); 14675 } 14676 14677 if (mAttachInfo == null) { 14678 result = false; 14679 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14680 "View " + this + " is not attached to a window."); 14681 } 14682 } 14683 14684 if (checkDrawing) { 14685 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 14686 // from their draw() method 14687 14688 if ((mPrivateFlags & DRAWN) != DRAWN && 14689 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 14690 result = false; 14691 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14692 "View " + this + " was invalidated but its drawing cache is valid."); 14693 } 14694 } 14695 14696 return result; 14697 } 14698 14699 /** 14700 * Prints information about this view in the log output, with the tag 14701 * {@link #VIEW_LOG_TAG}. 14702 * 14703 * @hide 14704 */ 14705 public void debug() { 14706 debug(0); 14707 } 14708 14709 /** 14710 * Prints information about this view in the log output, with the tag 14711 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14712 * indentation defined by the <code>depth</code>. 14713 * 14714 * @param depth the indentation level 14715 * 14716 * @hide 14717 */ 14718 protected void debug(int depth) { 14719 String output = debugIndent(depth - 1); 14720 14721 output += "+ " + this; 14722 int id = getId(); 14723 if (id != -1) { 14724 output += " (id=" + id + ")"; 14725 } 14726 Object tag = getTag(); 14727 if (tag != null) { 14728 output += " (tag=" + tag + ")"; 14729 } 14730 Log.d(VIEW_LOG_TAG, output); 14731 14732 if ((mPrivateFlags & FOCUSED) != 0) { 14733 output = debugIndent(depth) + " FOCUSED"; 14734 Log.d(VIEW_LOG_TAG, output); 14735 } 14736 14737 output = debugIndent(depth); 14738 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14739 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14740 + "} "; 14741 Log.d(VIEW_LOG_TAG, output); 14742 14743 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14744 || mPaddingBottom != 0) { 14745 output = debugIndent(depth); 14746 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14747 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14748 Log.d(VIEW_LOG_TAG, output); 14749 } 14750 14751 output = debugIndent(depth); 14752 output += "mMeasureWidth=" + mMeasuredWidth + 14753 " mMeasureHeight=" + mMeasuredHeight; 14754 Log.d(VIEW_LOG_TAG, output); 14755 14756 output = debugIndent(depth); 14757 if (mLayoutParams == null) { 14758 output += "BAD! no layout params"; 14759 } else { 14760 output = mLayoutParams.debug(output); 14761 } 14762 Log.d(VIEW_LOG_TAG, output); 14763 14764 output = debugIndent(depth); 14765 output += "flags={"; 14766 output += View.printFlags(mViewFlags); 14767 output += "}"; 14768 Log.d(VIEW_LOG_TAG, output); 14769 14770 output = debugIndent(depth); 14771 output += "privateFlags={"; 14772 output += View.printPrivateFlags(mPrivateFlags); 14773 output += "}"; 14774 Log.d(VIEW_LOG_TAG, output); 14775 } 14776 14777 /** 14778 * Creates a string of whitespaces used for indentation. 14779 * 14780 * @param depth the indentation level 14781 * @return a String containing (depth * 2 + 3) * 2 white spaces 14782 * 14783 * @hide 14784 */ 14785 protected static String debugIndent(int depth) { 14786 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14787 for (int i = 0; i < (depth * 2) + 3; i++) { 14788 spaces.append(' ').append(' '); 14789 } 14790 return spaces.toString(); 14791 } 14792 14793 /** 14794 * <p>Return the offset of the widget's text baseline from the widget's top 14795 * boundary. If this widget does not support baseline alignment, this 14796 * method returns -1. </p> 14797 * 14798 * @return the offset of the baseline within the widget's bounds or -1 14799 * if baseline alignment is not supported 14800 */ 14801 @ViewDebug.ExportedProperty(category = "layout") 14802 public int getBaseline() { 14803 return -1; 14804 } 14805 14806 /** 14807 * Call this when something has changed which has invalidated the 14808 * layout of this view. This will schedule a layout pass of the view 14809 * tree. 14810 */ 14811 public void requestLayout() { 14812 if (ViewDebug.TRACE_HIERARCHY) { 14813 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 14814 } 14815 14816 mPrivateFlags |= FORCE_LAYOUT; 14817 mPrivateFlags |= INVALIDATED; 14818 14819 if (mLayoutParams != null) { 14820 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14821 } 14822 14823 if (mParent != null && !mParent.isLayoutRequested()) { 14824 mParent.requestLayout(); 14825 } 14826 } 14827 14828 /** 14829 * Forces this view to be laid out during the next layout pass. 14830 * This method does not call requestLayout() or forceLayout() 14831 * on the parent. 14832 */ 14833 public void forceLayout() { 14834 mPrivateFlags |= FORCE_LAYOUT; 14835 mPrivateFlags |= INVALIDATED; 14836 } 14837 14838 /** 14839 * <p> 14840 * This is called to find out how big a view should be. The parent 14841 * supplies constraint information in the width and height parameters. 14842 * </p> 14843 * 14844 * <p> 14845 * The actual measurement work of a view is performed in 14846 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14847 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14848 * </p> 14849 * 14850 * 14851 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14852 * parent 14853 * @param heightMeasureSpec Vertical space requirements as imposed by the 14854 * parent 14855 * 14856 * @see #onMeasure(int, int) 14857 */ 14858 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14859 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14860 widthMeasureSpec != mOldWidthMeasureSpec || 14861 heightMeasureSpec != mOldHeightMeasureSpec) { 14862 14863 // first clears the measured dimension flag 14864 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14865 14866 if (ViewDebug.TRACE_HIERARCHY) { 14867 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 14868 } 14869 14870 // measure ourselves, this should set the measured dimension flag back 14871 onMeasure(widthMeasureSpec, heightMeasureSpec); 14872 14873 // flag not set, setMeasuredDimension() was not invoked, we raise 14874 // an exception to warn the developer 14875 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 14876 throw new IllegalStateException("onMeasure() did not set the" 14877 + " measured dimension by calling" 14878 + " setMeasuredDimension()"); 14879 } 14880 14881 mPrivateFlags |= LAYOUT_REQUIRED; 14882 } 14883 14884 mOldWidthMeasureSpec = widthMeasureSpec; 14885 mOldHeightMeasureSpec = heightMeasureSpec; 14886 } 14887 14888 /** 14889 * <p> 14890 * Measure the view and its content to determine the measured width and the 14891 * measured height. This method is invoked by {@link #measure(int, int)} and 14892 * should be overriden by subclasses to provide accurate and efficient 14893 * measurement of their contents. 14894 * </p> 14895 * 14896 * <p> 14897 * <strong>CONTRACT:</strong> When overriding this method, you 14898 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 14899 * measured width and height of this view. Failure to do so will trigger an 14900 * <code>IllegalStateException</code>, thrown by 14901 * {@link #measure(int, int)}. Calling the superclass' 14902 * {@link #onMeasure(int, int)} is a valid use. 14903 * </p> 14904 * 14905 * <p> 14906 * The base class implementation of measure defaults to the background size, 14907 * unless a larger size is allowed by the MeasureSpec. Subclasses should 14908 * override {@link #onMeasure(int, int)} to provide better measurements of 14909 * their content. 14910 * </p> 14911 * 14912 * <p> 14913 * If this method is overridden, it is the subclass's responsibility to make 14914 * sure the measured height and width are at least the view's minimum height 14915 * and width ({@link #getSuggestedMinimumHeight()} and 14916 * {@link #getSuggestedMinimumWidth()}). 14917 * </p> 14918 * 14919 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 14920 * The requirements are encoded with 14921 * {@link android.view.View.MeasureSpec}. 14922 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 14923 * The requirements are encoded with 14924 * {@link android.view.View.MeasureSpec}. 14925 * 14926 * @see #getMeasuredWidth() 14927 * @see #getMeasuredHeight() 14928 * @see #setMeasuredDimension(int, int) 14929 * @see #getSuggestedMinimumHeight() 14930 * @see #getSuggestedMinimumWidth() 14931 * @see android.view.View.MeasureSpec#getMode(int) 14932 * @see android.view.View.MeasureSpec#getSize(int) 14933 */ 14934 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 14935 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 14936 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 14937 } 14938 14939 /** 14940 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 14941 * measured width and measured height. Failing to do so will trigger an 14942 * exception at measurement time.</p> 14943 * 14944 * @param measuredWidth The measured width of this view. May be a complex 14945 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 14946 * {@link #MEASURED_STATE_TOO_SMALL}. 14947 * @param measuredHeight The measured height of this view. May be a complex 14948 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 14949 * {@link #MEASURED_STATE_TOO_SMALL}. 14950 */ 14951 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 14952 mMeasuredWidth = measuredWidth; 14953 mMeasuredHeight = measuredHeight; 14954 14955 mPrivateFlags |= MEASURED_DIMENSION_SET; 14956 } 14957 14958 /** 14959 * Merge two states as returned by {@link #getMeasuredState()}. 14960 * @param curState The current state as returned from a view or the result 14961 * of combining multiple views. 14962 * @param newState The new view state to combine. 14963 * @return Returns a new integer reflecting the combination of the two 14964 * states. 14965 */ 14966 public static int combineMeasuredStates(int curState, int newState) { 14967 return curState | newState; 14968 } 14969 14970 /** 14971 * Version of {@link #resolveSizeAndState(int, int, int)} 14972 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 14973 */ 14974 public static int resolveSize(int size, int measureSpec) { 14975 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 14976 } 14977 14978 /** 14979 * Utility to reconcile a desired size and state, with constraints imposed 14980 * by a MeasureSpec. Will take the desired size, unless a different size 14981 * is imposed by the constraints. The returned value is a compound integer, 14982 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 14983 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 14984 * size is smaller than the size the view wants to be. 14985 * 14986 * @param size How big the view wants to be 14987 * @param measureSpec Constraints imposed by the parent 14988 * @return Size information bit mask as defined by 14989 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 14990 */ 14991 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 14992 int result = size; 14993 int specMode = MeasureSpec.getMode(measureSpec); 14994 int specSize = MeasureSpec.getSize(measureSpec); 14995 switch (specMode) { 14996 case MeasureSpec.UNSPECIFIED: 14997 result = size; 14998 break; 14999 case MeasureSpec.AT_MOST: 15000 if (specSize < size) { 15001 result = specSize | MEASURED_STATE_TOO_SMALL; 15002 } else { 15003 result = size; 15004 } 15005 break; 15006 case MeasureSpec.EXACTLY: 15007 result = specSize; 15008 break; 15009 } 15010 return result | (childMeasuredState&MEASURED_STATE_MASK); 15011 } 15012 15013 /** 15014 * Utility to return a default size. Uses the supplied size if the 15015 * MeasureSpec imposed no constraints. Will get larger if allowed 15016 * by the MeasureSpec. 15017 * 15018 * @param size Default size for this view 15019 * @param measureSpec Constraints imposed by the parent 15020 * @return The size this view should be. 15021 */ 15022 public static int getDefaultSize(int size, int measureSpec) { 15023 int result = size; 15024 int specMode = MeasureSpec.getMode(measureSpec); 15025 int specSize = MeasureSpec.getSize(measureSpec); 15026 15027 switch (specMode) { 15028 case MeasureSpec.UNSPECIFIED: 15029 result = size; 15030 break; 15031 case MeasureSpec.AT_MOST: 15032 case MeasureSpec.EXACTLY: 15033 result = specSize; 15034 break; 15035 } 15036 return result; 15037 } 15038 15039 /** 15040 * Returns the suggested minimum height that the view should use. This 15041 * returns the maximum of the view's minimum height 15042 * and the background's minimum height 15043 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15044 * <p> 15045 * When being used in {@link #onMeasure(int, int)}, the caller should still 15046 * ensure the returned height is within the requirements of the parent. 15047 * 15048 * @return The suggested minimum height of the view. 15049 */ 15050 protected int getSuggestedMinimumHeight() { 15051 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15052 15053 } 15054 15055 /** 15056 * Returns the suggested minimum width that the view should use. This 15057 * returns the maximum of the view's minimum width) 15058 * and the background's minimum width 15059 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15060 * <p> 15061 * When being used in {@link #onMeasure(int, int)}, the caller should still 15062 * ensure the returned width is within the requirements of the parent. 15063 * 15064 * @return The suggested minimum width of the view. 15065 */ 15066 protected int getSuggestedMinimumWidth() { 15067 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15068 } 15069 15070 /** 15071 * Returns the minimum height of the view. 15072 * 15073 * @return the minimum height the view will try to be. 15074 * 15075 * @see #setMinimumHeight(int) 15076 * 15077 * @attr ref android.R.styleable#View_minHeight 15078 */ 15079 public int getMinimumHeight() { 15080 return mMinHeight; 15081 } 15082 15083 /** 15084 * Sets the minimum height of the view. It is not guaranteed the view will 15085 * be able to achieve this minimum height (for example, if its parent layout 15086 * constrains it with less available height). 15087 * 15088 * @param minHeight The minimum height the view will try to be. 15089 * 15090 * @see #getMinimumHeight() 15091 * 15092 * @attr ref android.R.styleable#View_minHeight 15093 */ 15094 public void setMinimumHeight(int minHeight) { 15095 mMinHeight = minHeight; 15096 requestLayout(); 15097 } 15098 15099 /** 15100 * Returns the minimum width of the view. 15101 * 15102 * @return the minimum width the view will try to be. 15103 * 15104 * @see #setMinimumWidth(int) 15105 * 15106 * @attr ref android.R.styleable#View_minWidth 15107 */ 15108 public int getMinimumWidth() { 15109 return mMinWidth; 15110 } 15111 15112 /** 15113 * Sets the minimum width of the view. It is not guaranteed the view will 15114 * be able to achieve this minimum width (for example, if its parent layout 15115 * constrains it with less available width). 15116 * 15117 * @param minWidth The minimum width the view will try to be. 15118 * 15119 * @see #getMinimumWidth() 15120 * 15121 * @attr ref android.R.styleable#View_minWidth 15122 */ 15123 public void setMinimumWidth(int minWidth) { 15124 mMinWidth = minWidth; 15125 requestLayout(); 15126 15127 } 15128 15129 /** 15130 * Get the animation currently associated with this view. 15131 * 15132 * @return The animation that is currently playing or 15133 * scheduled to play for this view. 15134 */ 15135 public Animation getAnimation() { 15136 return mCurrentAnimation; 15137 } 15138 15139 /** 15140 * Start the specified animation now. 15141 * 15142 * @param animation the animation to start now 15143 */ 15144 public void startAnimation(Animation animation) { 15145 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15146 setAnimation(animation); 15147 invalidateParentCaches(); 15148 invalidate(true); 15149 } 15150 15151 /** 15152 * Cancels any animations for this view. 15153 */ 15154 public void clearAnimation() { 15155 if (mCurrentAnimation != null) { 15156 mCurrentAnimation.detach(); 15157 } 15158 mCurrentAnimation = null; 15159 invalidateParentIfNeeded(); 15160 } 15161 15162 /** 15163 * Sets the next animation to play for this view. 15164 * If you want the animation to play immediately, use 15165 * startAnimation. This method provides allows fine-grained 15166 * control over the start time and invalidation, but you 15167 * must make sure that 1) the animation has a start time set, and 15168 * 2) the view will be invalidated when the animation is supposed to 15169 * start. 15170 * 15171 * @param animation The next animation, or null. 15172 */ 15173 public void setAnimation(Animation animation) { 15174 mCurrentAnimation = animation; 15175 15176 if (animation != null) { 15177 // If the screen is off assume the animation start time is now instead of 15178 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15179 // would cause the animation to start when the screen turns back on 15180 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15181 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15182 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15183 } 15184 animation.reset(); 15185 } 15186 } 15187 15188 /** 15189 * Invoked by a parent ViewGroup to notify the start of the animation 15190 * currently associated with this view. If you override this method, 15191 * always call super.onAnimationStart(); 15192 * 15193 * @see #setAnimation(android.view.animation.Animation) 15194 * @see #getAnimation() 15195 */ 15196 protected void onAnimationStart() { 15197 mPrivateFlags |= ANIMATION_STARTED; 15198 } 15199 15200 /** 15201 * Invoked by a parent ViewGroup to notify the end of the animation 15202 * currently associated with this view. If you override this method, 15203 * always call super.onAnimationEnd(); 15204 * 15205 * @see #setAnimation(android.view.animation.Animation) 15206 * @see #getAnimation() 15207 */ 15208 protected void onAnimationEnd() { 15209 mPrivateFlags &= ~ANIMATION_STARTED; 15210 } 15211 15212 /** 15213 * Invoked if there is a Transform that involves alpha. Subclass that can 15214 * draw themselves with the specified alpha should return true, and then 15215 * respect that alpha when their onDraw() is called. If this returns false 15216 * then the view may be redirected to draw into an offscreen buffer to 15217 * fulfill the request, which will look fine, but may be slower than if the 15218 * subclass handles it internally. The default implementation returns false. 15219 * 15220 * @param alpha The alpha (0..255) to apply to the view's drawing 15221 * @return true if the view can draw with the specified alpha. 15222 */ 15223 protected boolean onSetAlpha(int alpha) { 15224 return false; 15225 } 15226 15227 /** 15228 * This is used by the RootView to perform an optimization when 15229 * the view hierarchy contains one or several SurfaceView. 15230 * SurfaceView is always considered transparent, but its children are not, 15231 * therefore all View objects remove themselves from the global transparent 15232 * region (passed as a parameter to this function). 15233 * 15234 * @param region The transparent region for this ViewAncestor (window). 15235 * 15236 * @return Returns true if the effective visibility of the view at this 15237 * point is opaque, regardless of the transparent region; returns false 15238 * if it is possible for underlying windows to be seen behind the view. 15239 * 15240 * {@hide} 15241 */ 15242 public boolean gatherTransparentRegion(Region region) { 15243 final AttachInfo attachInfo = mAttachInfo; 15244 if (region != null && attachInfo != null) { 15245 final int pflags = mPrivateFlags; 15246 if ((pflags & SKIP_DRAW) == 0) { 15247 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15248 // remove it from the transparent region. 15249 final int[] location = attachInfo.mTransparentLocation; 15250 getLocationInWindow(location); 15251 region.op(location[0], location[1], location[0] + mRight - mLeft, 15252 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15253 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15254 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15255 // exists, so we remove the background drawable's non-transparent 15256 // parts from this transparent region. 15257 applyDrawableToTransparentRegion(mBackground, region); 15258 } 15259 } 15260 return true; 15261 } 15262 15263 /** 15264 * Play a sound effect for this view. 15265 * 15266 * <p>The framework will play sound effects for some built in actions, such as 15267 * clicking, but you may wish to play these effects in your widget, 15268 * for instance, for internal navigation. 15269 * 15270 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15271 * {@link #isSoundEffectsEnabled()} is true. 15272 * 15273 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15274 */ 15275 public void playSoundEffect(int soundConstant) { 15276 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15277 return; 15278 } 15279 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15280 } 15281 15282 /** 15283 * BZZZTT!!1! 15284 * 15285 * <p>Provide haptic feedback to the user for this view. 15286 * 15287 * <p>The framework will provide haptic feedback for some built in actions, 15288 * such as long presses, but you may wish to provide feedback for your 15289 * own widget. 15290 * 15291 * <p>The feedback will only be performed if 15292 * {@link #isHapticFeedbackEnabled()} is true. 15293 * 15294 * @param feedbackConstant One of the constants defined in 15295 * {@link HapticFeedbackConstants} 15296 */ 15297 public boolean performHapticFeedback(int feedbackConstant) { 15298 return performHapticFeedback(feedbackConstant, 0); 15299 } 15300 15301 /** 15302 * BZZZTT!!1! 15303 * 15304 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15305 * 15306 * @param feedbackConstant One of the constants defined in 15307 * {@link HapticFeedbackConstants} 15308 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15309 */ 15310 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15311 if (mAttachInfo == null) { 15312 return false; 15313 } 15314 //noinspection SimplifiableIfStatement 15315 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15316 && !isHapticFeedbackEnabled()) { 15317 return false; 15318 } 15319 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15320 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15321 } 15322 15323 /** 15324 * Request that the visibility of the status bar or other screen/window 15325 * decorations be changed. 15326 * 15327 * <p>This method is used to put the over device UI into temporary modes 15328 * where the user's attention is focused more on the application content, 15329 * by dimming or hiding surrounding system affordances. This is typically 15330 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15331 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15332 * to be placed behind the action bar (and with these flags other system 15333 * affordances) so that smooth transitions between hiding and showing them 15334 * can be done. 15335 * 15336 * <p>Two representative examples of the use of system UI visibility is 15337 * implementing a content browsing application (like a magazine reader) 15338 * and a video playing application. 15339 * 15340 * <p>The first code shows a typical implementation of a View in a content 15341 * browsing application. In this implementation, the application goes 15342 * into a content-oriented mode by hiding the status bar and action bar, 15343 * and putting the navigation elements into lights out mode. The user can 15344 * then interact with content while in this mode. Such an application should 15345 * provide an easy way for the user to toggle out of the mode (such as to 15346 * check information in the status bar or access notifications). In the 15347 * implementation here, this is done simply by tapping on the content. 15348 * 15349 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15350 * content} 15351 * 15352 * <p>This second code sample shows a typical implementation of a View 15353 * in a video playing application. In this situation, while the video is 15354 * playing the application would like to go into a complete full-screen mode, 15355 * to use as much of the display as possible for the video. When in this state 15356 * the user can not interact with the application; the system intercepts 15357 * touching on the screen to pop the UI out of full screen mode. 15358 * 15359 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15360 * content} 15361 * 15362 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15363 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15364 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15365 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15366 */ 15367 public void setSystemUiVisibility(int visibility) { 15368 if (visibility != mSystemUiVisibility) { 15369 mSystemUiVisibility = visibility; 15370 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15371 mParent.recomputeViewAttributes(this); 15372 } 15373 } 15374 } 15375 15376 /** 15377 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15378 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15379 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15380 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15381 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15382 */ 15383 public int getSystemUiVisibility() { 15384 return mSystemUiVisibility; 15385 } 15386 15387 /** 15388 * Returns the current system UI visibility that is currently set for 15389 * the entire window. This is the combination of the 15390 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15391 * views in the window. 15392 */ 15393 public int getWindowSystemUiVisibility() { 15394 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15395 } 15396 15397 /** 15398 * Override to find out when the window's requested system UI visibility 15399 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15400 * This is different from the callbacks recieved through 15401 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15402 * in that this is only telling you about the local request of the window, 15403 * not the actual values applied by the system. 15404 */ 15405 public void onWindowSystemUiVisibilityChanged(int visible) { 15406 } 15407 15408 /** 15409 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15410 * the view hierarchy. 15411 */ 15412 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15413 onWindowSystemUiVisibilityChanged(visible); 15414 } 15415 15416 /** 15417 * Set a listener to receive callbacks when the visibility of the system bar changes. 15418 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15419 */ 15420 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15421 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15422 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15423 mParent.recomputeViewAttributes(this); 15424 } 15425 } 15426 15427 /** 15428 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15429 * the view hierarchy. 15430 */ 15431 public void dispatchSystemUiVisibilityChanged(int visibility) { 15432 ListenerInfo li = mListenerInfo; 15433 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15434 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15435 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15436 } 15437 } 15438 15439 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 15440 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15441 if (val != mSystemUiVisibility) { 15442 setSystemUiVisibility(val); 15443 } 15444 } 15445 15446 /** @hide */ 15447 public void setDisabledSystemUiVisibility(int flags) { 15448 if (mAttachInfo != null) { 15449 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15450 mAttachInfo.mDisabledSystemUiVisibility = flags; 15451 if (mParent != null) { 15452 mParent.recomputeViewAttributes(this); 15453 } 15454 } 15455 } 15456 } 15457 15458 /** 15459 * Creates an image that the system displays during the drag and drop 15460 * operation. This is called a "drag shadow". The default implementation 15461 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15462 * appearance as the given View. The default also positions the center of the drag shadow 15463 * directly under the touch point. If no View is provided (the constructor with no parameters 15464 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15465 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15466 * default is an invisible drag shadow. 15467 * <p> 15468 * You are not required to use the View you provide to the constructor as the basis of the 15469 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15470 * anything you want as the drag shadow. 15471 * </p> 15472 * <p> 15473 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15474 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15475 * size and position of the drag shadow. It uses this data to construct a 15476 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15477 * so that your application can draw the shadow image in the Canvas. 15478 * </p> 15479 * 15480 * <div class="special reference"> 15481 * <h3>Developer Guides</h3> 15482 * <p>For a guide to implementing drag and drop features, read the 15483 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15484 * </div> 15485 */ 15486 public static class DragShadowBuilder { 15487 private final WeakReference<View> mView; 15488 15489 /** 15490 * Constructs a shadow image builder based on a View. By default, the resulting drag 15491 * shadow will have the same appearance and dimensions as the View, with the touch point 15492 * over the center of the View. 15493 * @param view A View. Any View in scope can be used. 15494 */ 15495 public DragShadowBuilder(View view) { 15496 mView = new WeakReference<View>(view); 15497 } 15498 15499 /** 15500 * Construct a shadow builder object with no associated View. This 15501 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15502 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15503 * to supply the drag shadow's dimensions and appearance without 15504 * reference to any View object. If they are not overridden, then the result is an 15505 * invisible drag shadow. 15506 */ 15507 public DragShadowBuilder() { 15508 mView = new WeakReference<View>(null); 15509 } 15510 15511 /** 15512 * Returns the View object that had been passed to the 15513 * {@link #View.DragShadowBuilder(View)} 15514 * constructor. If that View parameter was {@code null} or if the 15515 * {@link #View.DragShadowBuilder()} 15516 * constructor was used to instantiate the builder object, this method will return 15517 * null. 15518 * 15519 * @return The View object associate with this builder object. 15520 */ 15521 @SuppressWarnings({"JavadocReference"}) 15522 final public View getView() { 15523 return mView.get(); 15524 } 15525 15526 /** 15527 * Provides the metrics for the shadow image. These include the dimensions of 15528 * the shadow image, and the point within that shadow that should 15529 * be centered under the touch location while dragging. 15530 * <p> 15531 * The default implementation sets the dimensions of the shadow to be the 15532 * same as the dimensions of the View itself and centers the shadow under 15533 * the touch point. 15534 * </p> 15535 * 15536 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15537 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15538 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15539 * image. 15540 * 15541 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15542 * shadow image that should be underneath the touch point during the drag and drop 15543 * operation. Your application must set {@link android.graphics.Point#x} to the 15544 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15545 */ 15546 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15547 final View view = mView.get(); 15548 if (view != null) { 15549 shadowSize.set(view.getWidth(), view.getHeight()); 15550 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15551 } else { 15552 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15553 } 15554 } 15555 15556 /** 15557 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15558 * based on the dimensions it received from the 15559 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15560 * 15561 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15562 */ 15563 public void onDrawShadow(Canvas canvas) { 15564 final View view = mView.get(); 15565 if (view != null) { 15566 view.draw(canvas); 15567 } else { 15568 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15569 } 15570 } 15571 } 15572 15573 /** 15574 * Starts a drag and drop operation. When your application calls this method, it passes a 15575 * {@link android.view.View.DragShadowBuilder} object to the system. The 15576 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15577 * to get metrics for the drag shadow, and then calls the object's 15578 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15579 * <p> 15580 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15581 * drag events to all the View objects in your application that are currently visible. It does 15582 * this either by calling the View object's drag listener (an implementation of 15583 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15584 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15585 * Both are passed a {@link android.view.DragEvent} object that has a 15586 * {@link android.view.DragEvent#getAction()} value of 15587 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15588 * </p> 15589 * <p> 15590 * Your application can invoke startDrag() on any attached View object. The View object does not 15591 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15592 * be related to the View the user selected for dragging. 15593 * </p> 15594 * @param data A {@link android.content.ClipData} object pointing to the data to be 15595 * transferred by the drag and drop operation. 15596 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15597 * drag shadow. 15598 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15599 * drop operation. This Object is put into every DragEvent object sent by the system during the 15600 * current drag. 15601 * <p> 15602 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15603 * to the target Views. For example, it can contain flags that differentiate between a 15604 * a copy operation and a move operation. 15605 * </p> 15606 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15607 * so the parameter should be set to 0. 15608 * @return {@code true} if the method completes successfully, or 15609 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15610 * do a drag, and so no drag operation is in progress. 15611 */ 15612 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15613 Object myLocalState, int flags) { 15614 if (ViewDebug.DEBUG_DRAG) { 15615 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15616 } 15617 boolean okay = false; 15618 15619 Point shadowSize = new Point(); 15620 Point shadowTouchPoint = new Point(); 15621 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15622 15623 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15624 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15625 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15626 } 15627 15628 if (ViewDebug.DEBUG_DRAG) { 15629 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15630 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15631 } 15632 Surface surface = new Surface(); 15633 try { 15634 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15635 flags, shadowSize.x, shadowSize.y, surface); 15636 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15637 + " surface=" + surface); 15638 if (token != null) { 15639 Canvas canvas = surface.lockCanvas(null); 15640 try { 15641 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15642 shadowBuilder.onDrawShadow(canvas); 15643 } finally { 15644 surface.unlockCanvasAndPost(canvas); 15645 } 15646 15647 final ViewRootImpl root = getViewRootImpl(); 15648 15649 // Cache the local state object for delivery with DragEvents 15650 root.setLocalDragState(myLocalState); 15651 15652 // repurpose 'shadowSize' for the last touch point 15653 root.getLastTouchPoint(shadowSize); 15654 15655 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15656 shadowSize.x, shadowSize.y, 15657 shadowTouchPoint.x, shadowTouchPoint.y, data); 15658 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15659 15660 // Off and running! Release our local surface instance; the drag 15661 // shadow surface is now managed by the system process. 15662 surface.release(); 15663 } 15664 } catch (Exception e) { 15665 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15666 surface.destroy(); 15667 } 15668 15669 return okay; 15670 } 15671 15672 /** 15673 * Handles drag events sent by the system following a call to 15674 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15675 *<p> 15676 * When the system calls this method, it passes a 15677 * {@link android.view.DragEvent} object. A call to 15678 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15679 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15680 * operation. 15681 * @param event The {@link android.view.DragEvent} sent by the system. 15682 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15683 * in DragEvent, indicating the type of drag event represented by this object. 15684 * @return {@code true} if the method was successful, otherwise {@code false}. 15685 * <p> 15686 * The method should return {@code true} in response to an action type of 15687 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15688 * operation. 15689 * </p> 15690 * <p> 15691 * The method should also return {@code true} in response to an action type of 15692 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15693 * {@code false} if it didn't. 15694 * </p> 15695 */ 15696 public boolean onDragEvent(DragEvent event) { 15697 return false; 15698 } 15699 15700 /** 15701 * Detects if this View is enabled and has a drag event listener. 15702 * If both are true, then it calls the drag event listener with the 15703 * {@link android.view.DragEvent} it received. If the drag event listener returns 15704 * {@code true}, then dispatchDragEvent() returns {@code true}. 15705 * <p> 15706 * For all other cases, the method calls the 15707 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15708 * method and returns its result. 15709 * </p> 15710 * <p> 15711 * This ensures that a drag event is always consumed, even if the View does not have a drag 15712 * event listener. However, if the View has a listener and the listener returns true, then 15713 * onDragEvent() is not called. 15714 * </p> 15715 */ 15716 public boolean dispatchDragEvent(DragEvent event) { 15717 //noinspection SimplifiableIfStatement 15718 ListenerInfo li = mListenerInfo; 15719 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15720 && li.mOnDragListener.onDrag(this, event)) { 15721 return true; 15722 } 15723 return onDragEvent(event); 15724 } 15725 15726 boolean canAcceptDrag() { 15727 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15728 } 15729 15730 /** 15731 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15732 * it is ever exposed at all. 15733 * @hide 15734 */ 15735 public void onCloseSystemDialogs(String reason) { 15736 } 15737 15738 /** 15739 * Given a Drawable whose bounds have been set to draw into this view, 15740 * update a Region being computed for 15741 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15742 * that any non-transparent parts of the Drawable are removed from the 15743 * given transparent region. 15744 * 15745 * @param dr The Drawable whose transparency is to be applied to the region. 15746 * @param region A Region holding the current transparency information, 15747 * where any parts of the region that are set are considered to be 15748 * transparent. On return, this region will be modified to have the 15749 * transparency information reduced by the corresponding parts of the 15750 * Drawable that are not transparent. 15751 * {@hide} 15752 */ 15753 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15754 if (DBG) { 15755 Log.i("View", "Getting transparent region for: " + this); 15756 } 15757 final Region r = dr.getTransparentRegion(); 15758 final Rect db = dr.getBounds(); 15759 final AttachInfo attachInfo = mAttachInfo; 15760 if (r != null && attachInfo != null) { 15761 final int w = getRight()-getLeft(); 15762 final int h = getBottom()-getTop(); 15763 if (db.left > 0) { 15764 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15765 r.op(0, 0, db.left, h, Region.Op.UNION); 15766 } 15767 if (db.right < w) { 15768 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15769 r.op(db.right, 0, w, h, Region.Op.UNION); 15770 } 15771 if (db.top > 0) { 15772 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15773 r.op(0, 0, w, db.top, Region.Op.UNION); 15774 } 15775 if (db.bottom < h) { 15776 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15777 r.op(0, db.bottom, w, h, Region.Op.UNION); 15778 } 15779 final int[] location = attachInfo.mTransparentLocation; 15780 getLocationInWindow(location); 15781 r.translate(location[0], location[1]); 15782 region.op(r, Region.Op.INTERSECT); 15783 } else { 15784 region.op(db, Region.Op.DIFFERENCE); 15785 } 15786 } 15787 15788 private void checkForLongClick(int delayOffset) { 15789 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15790 mHasPerformedLongPress = false; 15791 15792 if (mPendingCheckForLongPress == null) { 15793 mPendingCheckForLongPress = new CheckForLongPress(); 15794 } 15795 mPendingCheckForLongPress.rememberWindowAttachCount(); 15796 postDelayed(mPendingCheckForLongPress, 15797 ViewConfiguration.getLongPressTimeout() - delayOffset); 15798 } 15799 } 15800 15801 /** 15802 * Inflate a view from an XML resource. This convenience method wraps the {@link 15803 * LayoutInflater} class, which provides a full range of options for view inflation. 15804 * 15805 * @param context The Context object for your activity or application. 15806 * @param resource The resource ID to inflate 15807 * @param root A view group that will be the parent. Used to properly inflate the 15808 * layout_* parameters. 15809 * @see LayoutInflater 15810 */ 15811 public static View inflate(Context context, int resource, ViewGroup root) { 15812 LayoutInflater factory = LayoutInflater.from(context); 15813 return factory.inflate(resource, root); 15814 } 15815 15816 /** 15817 * Scroll the view with standard behavior for scrolling beyond the normal 15818 * content boundaries. Views that call this method should override 15819 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15820 * results of an over-scroll operation. 15821 * 15822 * Views can use this method to handle any touch or fling-based scrolling. 15823 * 15824 * @param deltaX Change in X in pixels 15825 * @param deltaY Change in Y in pixels 15826 * @param scrollX Current X scroll value in pixels before applying deltaX 15827 * @param scrollY Current Y scroll value in pixels before applying deltaY 15828 * @param scrollRangeX Maximum content scroll range along the X axis 15829 * @param scrollRangeY Maximum content scroll range along the Y axis 15830 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15831 * along the X axis. 15832 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15833 * along the Y axis. 15834 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15835 * @return true if scrolling was clamped to an over-scroll boundary along either 15836 * axis, false otherwise. 15837 */ 15838 @SuppressWarnings({"UnusedParameters"}) 15839 protected boolean overScrollBy(int deltaX, int deltaY, 15840 int scrollX, int scrollY, 15841 int scrollRangeX, int scrollRangeY, 15842 int maxOverScrollX, int maxOverScrollY, 15843 boolean isTouchEvent) { 15844 final int overScrollMode = mOverScrollMode; 15845 final boolean canScrollHorizontal = 15846 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15847 final boolean canScrollVertical = 15848 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15849 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15850 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15851 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15852 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15853 15854 int newScrollX = scrollX + deltaX; 15855 if (!overScrollHorizontal) { 15856 maxOverScrollX = 0; 15857 } 15858 15859 int newScrollY = scrollY + deltaY; 15860 if (!overScrollVertical) { 15861 maxOverScrollY = 0; 15862 } 15863 15864 // Clamp values if at the limits and record 15865 final int left = -maxOverScrollX; 15866 final int right = maxOverScrollX + scrollRangeX; 15867 final int top = -maxOverScrollY; 15868 final int bottom = maxOverScrollY + scrollRangeY; 15869 15870 boolean clampedX = false; 15871 if (newScrollX > right) { 15872 newScrollX = right; 15873 clampedX = true; 15874 } else if (newScrollX < left) { 15875 newScrollX = left; 15876 clampedX = true; 15877 } 15878 15879 boolean clampedY = false; 15880 if (newScrollY > bottom) { 15881 newScrollY = bottom; 15882 clampedY = true; 15883 } else if (newScrollY < top) { 15884 newScrollY = top; 15885 clampedY = true; 15886 } 15887 15888 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 15889 15890 return clampedX || clampedY; 15891 } 15892 15893 /** 15894 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 15895 * respond to the results of an over-scroll operation. 15896 * 15897 * @param scrollX New X scroll value in pixels 15898 * @param scrollY New Y scroll value in pixels 15899 * @param clampedX True if scrollX was clamped to an over-scroll boundary 15900 * @param clampedY True if scrollY was clamped to an over-scroll boundary 15901 */ 15902 protected void onOverScrolled(int scrollX, int scrollY, 15903 boolean clampedX, boolean clampedY) { 15904 // Intentionally empty. 15905 } 15906 15907 /** 15908 * Returns the over-scroll mode for this view. The result will be 15909 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15910 * (allow over-scrolling only if the view content is larger than the container), 15911 * or {@link #OVER_SCROLL_NEVER}. 15912 * 15913 * @return This view's over-scroll mode. 15914 */ 15915 public int getOverScrollMode() { 15916 return mOverScrollMode; 15917 } 15918 15919 /** 15920 * Set the over-scroll mode for this view. Valid over-scroll modes are 15921 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15922 * (allow over-scrolling only if the view content is larger than the container), 15923 * or {@link #OVER_SCROLL_NEVER}. 15924 * 15925 * Setting the over-scroll mode of a view will have an effect only if the 15926 * view is capable of scrolling. 15927 * 15928 * @param overScrollMode The new over-scroll mode for this view. 15929 */ 15930 public void setOverScrollMode(int overScrollMode) { 15931 if (overScrollMode != OVER_SCROLL_ALWAYS && 15932 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 15933 overScrollMode != OVER_SCROLL_NEVER) { 15934 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 15935 } 15936 mOverScrollMode = overScrollMode; 15937 } 15938 15939 /** 15940 * Gets a scale factor that determines the distance the view should scroll 15941 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 15942 * @return The vertical scroll scale factor. 15943 * @hide 15944 */ 15945 protected float getVerticalScrollFactor() { 15946 if (mVerticalScrollFactor == 0) { 15947 TypedValue outValue = new TypedValue(); 15948 if (!mContext.getTheme().resolveAttribute( 15949 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 15950 throw new IllegalStateException( 15951 "Expected theme to define listPreferredItemHeight."); 15952 } 15953 mVerticalScrollFactor = outValue.getDimension( 15954 mContext.getResources().getDisplayMetrics()); 15955 } 15956 return mVerticalScrollFactor; 15957 } 15958 15959 /** 15960 * Gets a scale factor that determines the distance the view should scroll 15961 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 15962 * @return The horizontal scroll scale factor. 15963 * @hide 15964 */ 15965 protected float getHorizontalScrollFactor() { 15966 // TODO: Should use something else. 15967 return getVerticalScrollFactor(); 15968 } 15969 15970 /** 15971 * Return the value specifying the text direction or policy that was set with 15972 * {@link #setTextDirection(int)}. 15973 * 15974 * @return the defined text direction. It can be one of: 15975 * 15976 * {@link #TEXT_DIRECTION_INHERIT}, 15977 * {@link #TEXT_DIRECTION_FIRST_STRONG} 15978 * {@link #TEXT_DIRECTION_ANY_RTL}, 15979 * {@link #TEXT_DIRECTION_LTR}, 15980 * {@link #TEXT_DIRECTION_RTL}, 15981 * {@link #TEXT_DIRECTION_LOCALE} 15982 * @hide 15983 */ 15984 @ViewDebug.ExportedProperty(category = "text", mapping = { 15985 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 15986 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 15987 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 15988 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 15989 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 15990 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 15991 }) 15992 public int getTextDirection() { 15993 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 15994 } 15995 15996 /** 15997 * Set the text direction. 15998 * 15999 * @param textDirection the direction to set. Should be one of: 16000 * 16001 * {@link #TEXT_DIRECTION_INHERIT}, 16002 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16003 * {@link #TEXT_DIRECTION_ANY_RTL}, 16004 * {@link #TEXT_DIRECTION_LTR}, 16005 * {@link #TEXT_DIRECTION_RTL}, 16006 * {@link #TEXT_DIRECTION_LOCALE} 16007 * @hide 16008 */ 16009 public void setTextDirection(int textDirection) { 16010 if (getTextDirection() != textDirection) { 16011 // Reset the current text direction and the resolved one 16012 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 16013 resetResolvedTextDirection(); 16014 // Set the new text direction 16015 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 16016 // Refresh 16017 requestLayout(); 16018 invalidate(true); 16019 } 16020 } 16021 16022 /** 16023 * Return the resolved text direction. 16024 * 16025 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 16026 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 16027 * up the parent chain of the view. if there is no parent, then it will return the default 16028 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 16029 * 16030 * @return the resolved text direction. Returns one of: 16031 * 16032 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16033 * {@link #TEXT_DIRECTION_ANY_RTL}, 16034 * {@link #TEXT_DIRECTION_LTR}, 16035 * {@link #TEXT_DIRECTION_RTL}, 16036 * {@link #TEXT_DIRECTION_LOCALE} 16037 * @hide 16038 */ 16039 public int getResolvedTextDirection() { 16040 // The text direction will be resolved only if needed 16041 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 16042 resolveTextDirection(); 16043 } 16044 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16045 } 16046 16047 /** 16048 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 16049 * resolution is done. 16050 * @hide 16051 */ 16052 public void resolveTextDirection() { 16053 // Reset any previous text direction resolution 16054 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16055 16056 if (hasRtlSupport()) { 16057 // Set resolved text direction flag depending on text direction flag 16058 final int textDirection = getTextDirection(); 16059 switch(textDirection) { 16060 case TEXT_DIRECTION_INHERIT: 16061 if (canResolveTextDirection()) { 16062 ViewGroup viewGroup = ((ViewGroup) mParent); 16063 16064 // Set current resolved direction to the same value as the parent's one 16065 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 16066 switch (parentResolvedDirection) { 16067 case TEXT_DIRECTION_FIRST_STRONG: 16068 case TEXT_DIRECTION_ANY_RTL: 16069 case TEXT_DIRECTION_LTR: 16070 case TEXT_DIRECTION_RTL: 16071 case TEXT_DIRECTION_LOCALE: 16072 mPrivateFlags2 |= 16073 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16074 break; 16075 default: 16076 // Default resolved direction is "first strong" heuristic 16077 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16078 } 16079 } else { 16080 // We cannot do the resolution if there is no parent, so use the default one 16081 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16082 } 16083 break; 16084 case TEXT_DIRECTION_FIRST_STRONG: 16085 case TEXT_DIRECTION_ANY_RTL: 16086 case TEXT_DIRECTION_LTR: 16087 case TEXT_DIRECTION_RTL: 16088 case TEXT_DIRECTION_LOCALE: 16089 // Resolved direction is the same as text direction 16090 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16091 break; 16092 default: 16093 // Default resolved direction is "first strong" heuristic 16094 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16095 } 16096 } else { 16097 // Default resolved direction is "first strong" heuristic 16098 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16099 } 16100 16101 // Set to resolved 16102 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 16103 onResolvedTextDirectionChanged(); 16104 } 16105 16106 /** 16107 * Called when text direction has been resolved. Subclasses that care about text direction 16108 * resolution should override this method. 16109 * 16110 * The default implementation does nothing. 16111 * @hide 16112 */ 16113 public void onResolvedTextDirectionChanged() { 16114 } 16115 16116 /** 16117 * Check if text direction resolution can be done. 16118 * 16119 * @return true if text direction resolution can be done otherwise return false. 16120 * @hide 16121 */ 16122 public boolean canResolveTextDirection() { 16123 switch (getTextDirection()) { 16124 case TEXT_DIRECTION_INHERIT: 16125 return (mParent != null) && (mParent instanceof ViewGroup); 16126 default: 16127 return true; 16128 } 16129 } 16130 16131 /** 16132 * Reset resolved text direction. Text direction can be resolved with a call to 16133 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 16134 * reset is done. 16135 * @hide 16136 */ 16137 public void resetResolvedTextDirection() { 16138 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16139 onResolvedTextDirectionReset(); 16140 } 16141 16142 /** 16143 * Called when text direction is reset. Subclasses that care about text direction reset should 16144 * override this method and do a reset of the text direction of their children. The default 16145 * implementation does nothing. 16146 * @hide 16147 */ 16148 public void onResolvedTextDirectionReset() { 16149 } 16150 16151 /** 16152 * Return the value specifying the text alignment or policy that was set with 16153 * {@link #setTextAlignment(int)}. 16154 * 16155 * @return the defined text alignment. It can be one of: 16156 * 16157 * {@link #TEXT_ALIGNMENT_INHERIT}, 16158 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16159 * {@link #TEXT_ALIGNMENT_CENTER}, 16160 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16161 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16162 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16163 * {@link #TEXT_ALIGNMENT_VIEW_END} 16164 * @hide 16165 */ 16166 @ViewDebug.ExportedProperty(category = "text", mapping = { 16167 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16168 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16169 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16170 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16171 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16172 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16173 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16174 }) 16175 public int getTextAlignment() { 16176 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 16177 } 16178 16179 /** 16180 * Set the text alignment. 16181 * 16182 * @param textAlignment The text alignment to set. Should be one of 16183 * 16184 * {@link #TEXT_ALIGNMENT_INHERIT}, 16185 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16186 * {@link #TEXT_ALIGNMENT_CENTER}, 16187 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16188 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16189 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16190 * {@link #TEXT_ALIGNMENT_VIEW_END} 16191 * 16192 * @attr ref android.R.styleable#View_textAlignment 16193 * @hide 16194 */ 16195 public void setTextAlignment(int textAlignment) { 16196 if (textAlignment != getTextAlignment()) { 16197 // Reset the current and resolved text alignment 16198 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 16199 resetResolvedTextAlignment(); 16200 // Set the new text alignment 16201 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 16202 // Refresh 16203 requestLayout(); 16204 invalidate(true); 16205 } 16206 } 16207 16208 /** 16209 * Return the resolved text alignment. 16210 * 16211 * The resolved text alignment. This needs resolution if the value is 16212 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16213 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16214 * 16215 * @return the resolved text alignment. Returns one of: 16216 * 16217 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16218 * {@link #TEXT_ALIGNMENT_CENTER}, 16219 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16220 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16221 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16222 * {@link #TEXT_ALIGNMENT_VIEW_END} 16223 * @hide 16224 */ 16225 @ViewDebug.ExportedProperty(category = "text", mapping = { 16226 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16227 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16228 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16229 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16230 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16231 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16232 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16233 }) 16234 public int getResolvedTextAlignment() { 16235 // If text alignment is not resolved, then resolve it 16236 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16237 resolveTextAlignment(); 16238 } 16239 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16240 } 16241 16242 /** 16243 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16244 * resolution is done. 16245 * @hide 16246 */ 16247 public void resolveTextAlignment() { 16248 // Reset any previous text alignment resolution 16249 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16250 16251 if (hasRtlSupport()) { 16252 // Set resolved text alignment flag depending on text alignment flag 16253 final int textAlignment = getTextAlignment(); 16254 switch (textAlignment) { 16255 case TEXT_ALIGNMENT_INHERIT: 16256 // Check if we can resolve the text alignment 16257 if (canResolveLayoutDirection() && mParent instanceof View) { 16258 View view = (View) mParent; 16259 16260 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16261 switch (parentResolvedTextAlignment) { 16262 case TEXT_ALIGNMENT_GRAVITY: 16263 case TEXT_ALIGNMENT_TEXT_START: 16264 case TEXT_ALIGNMENT_TEXT_END: 16265 case TEXT_ALIGNMENT_CENTER: 16266 case TEXT_ALIGNMENT_VIEW_START: 16267 case TEXT_ALIGNMENT_VIEW_END: 16268 // Resolved text alignment is the same as the parent resolved 16269 // text alignment 16270 mPrivateFlags2 |= 16271 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16272 break; 16273 default: 16274 // Use default resolved text alignment 16275 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16276 } 16277 } 16278 else { 16279 // We cannot do the resolution if there is no parent so use the default 16280 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16281 } 16282 break; 16283 case TEXT_ALIGNMENT_GRAVITY: 16284 case TEXT_ALIGNMENT_TEXT_START: 16285 case TEXT_ALIGNMENT_TEXT_END: 16286 case TEXT_ALIGNMENT_CENTER: 16287 case TEXT_ALIGNMENT_VIEW_START: 16288 case TEXT_ALIGNMENT_VIEW_END: 16289 // Resolved text alignment is the same as text alignment 16290 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16291 break; 16292 default: 16293 // Use default resolved text alignment 16294 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16295 } 16296 } else { 16297 // Use default resolved text alignment 16298 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16299 } 16300 16301 // Set the resolved 16302 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16303 onResolvedTextAlignmentChanged(); 16304 } 16305 16306 /** 16307 * Check if text alignment resolution can be done. 16308 * 16309 * @return true if text alignment resolution can be done otherwise return false. 16310 * @hide 16311 */ 16312 public boolean canResolveTextAlignment() { 16313 switch (getTextAlignment()) { 16314 case TEXT_DIRECTION_INHERIT: 16315 return (mParent != null); 16316 default: 16317 return true; 16318 } 16319 } 16320 16321 /** 16322 * Called when text alignment has been resolved. Subclasses that care about text alignment 16323 * resolution should override this method. 16324 * 16325 * The default implementation does nothing. 16326 * @hide 16327 */ 16328 public void onResolvedTextAlignmentChanged() { 16329 } 16330 16331 /** 16332 * Reset resolved text alignment. Text alignment can be resolved with a call to 16333 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16334 * reset is done. 16335 * @hide 16336 */ 16337 public void resetResolvedTextAlignment() { 16338 // Reset any previous text alignment resolution 16339 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16340 onResolvedTextAlignmentReset(); 16341 } 16342 16343 /** 16344 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16345 * override this method and do a reset of the text alignment of their children. The default 16346 * implementation does nothing. 16347 * @hide 16348 */ 16349 public void onResolvedTextAlignmentReset() { 16350 } 16351 16352 // 16353 // Properties 16354 // 16355 /** 16356 * A Property wrapper around the <code>alpha</code> functionality handled by the 16357 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16358 */ 16359 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16360 @Override 16361 public void setValue(View object, float value) { 16362 object.setAlpha(value); 16363 } 16364 16365 @Override 16366 public Float get(View object) { 16367 return object.getAlpha(); 16368 } 16369 }; 16370 16371 /** 16372 * A Property wrapper around the <code>translationX</code> functionality handled by the 16373 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16374 */ 16375 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16376 @Override 16377 public void setValue(View object, float value) { 16378 object.setTranslationX(value); 16379 } 16380 16381 @Override 16382 public Float get(View object) { 16383 return object.getTranslationX(); 16384 } 16385 }; 16386 16387 /** 16388 * A Property wrapper around the <code>translationY</code> functionality handled by the 16389 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16390 */ 16391 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16392 @Override 16393 public void setValue(View object, float value) { 16394 object.setTranslationY(value); 16395 } 16396 16397 @Override 16398 public Float get(View object) { 16399 return object.getTranslationY(); 16400 } 16401 }; 16402 16403 /** 16404 * A Property wrapper around the <code>x</code> functionality handled by the 16405 * {@link View#setX(float)} and {@link View#getX()} methods. 16406 */ 16407 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16408 @Override 16409 public void setValue(View object, float value) { 16410 object.setX(value); 16411 } 16412 16413 @Override 16414 public Float get(View object) { 16415 return object.getX(); 16416 } 16417 }; 16418 16419 /** 16420 * A Property wrapper around the <code>y</code> functionality handled by the 16421 * {@link View#setY(float)} and {@link View#getY()} methods. 16422 */ 16423 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16424 @Override 16425 public void setValue(View object, float value) { 16426 object.setY(value); 16427 } 16428 16429 @Override 16430 public Float get(View object) { 16431 return object.getY(); 16432 } 16433 }; 16434 16435 /** 16436 * A Property wrapper around the <code>rotation</code> functionality handled by the 16437 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16438 */ 16439 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16440 @Override 16441 public void setValue(View object, float value) { 16442 object.setRotation(value); 16443 } 16444 16445 @Override 16446 public Float get(View object) { 16447 return object.getRotation(); 16448 } 16449 }; 16450 16451 /** 16452 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16453 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16454 */ 16455 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16456 @Override 16457 public void setValue(View object, float value) { 16458 object.setRotationX(value); 16459 } 16460 16461 @Override 16462 public Float get(View object) { 16463 return object.getRotationX(); 16464 } 16465 }; 16466 16467 /** 16468 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16469 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16470 */ 16471 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16472 @Override 16473 public void setValue(View object, float value) { 16474 object.setRotationY(value); 16475 } 16476 16477 @Override 16478 public Float get(View object) { 16479 return object.getRotationY(); 16480 } 16481 }; 16482 16483 /** 16484 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16485 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16486 */ 16487 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16488 @Override 16489 public void setValue(View object, float value) { 16490 object.setScaleX(value); 16491 } 16492 16493 @Override 16494 public Float get(View object) { 16495 return object.getScaleX(); 16496 } 16497 }; 16498 16499 /** 16500 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16501 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16502 */ 16503 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16504 @Override 16505 public void setValue(View object, float value) { 16506 object.setScaleY(value); 16507 } 16508 16509 @Override 16510 public Float get(View object) { 16511 return object.getScaleY(); 16512 } 16513 }; 16514 16515 /** 16516 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16517 * Each MeasureSpec represents a requirement for either the width or the height. 16518 * A MeasureSpec is comprised of a size and a mode. There are three possible 16519 * modes: 16520 * <dl> 16521 * <dt>UNSPECIFIED</dt> 16522 * <dd> 16523 * The parent has not imposed any constraint on the child. It can be whatever size 16524 * it wants. 16525 * </dd> 16526 * 16527 * <dt>EXACTLY</dt> 16528 * <dd> 16529 * The parent has determined an exact size for the child. The child is going to be 16530 * given those bounds regardless of how big it wants to be. 16531 * </dd> 16532 * 16533 * <dt>AT_MOST</dt> 16534 * <dd> 16535 * The child can be as large as it wants up to the specified size. 16536 * </dd> 16537 * </dl> 16538 * 16539 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16540 * is provided to pack and unpack the <size, mode> tuple into the int. 16541 */ 16542 public static class MeasureSpec { 16543 private static final int MODE_SHIFT = 30; 16544 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16545 16546 /** 16547 * Measure specification mode: The parent has not imposed any constraint 16548 * on the child. It can be whatever size it wants. 16549 */ 16550 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16551 16552 /** 16553 * Measure specification mode: The parent has determined an exact size 16554 * for the child. The child is going to be given those bounds regardless 16555 * of how big it wants to be. 16556 */ 16557 public static final int EXACTLY = 1 << MODE_SHIFT; 16558 16559 /** 16560 * Measure specification mode: The child can be as large as it wants up 16561 * to the specified size. 16562 */ 16563 public static final int AT_MOST = 2 << MODE_SHIFT; 16564 16565 /** 16566 * Creates a measure specification based on the supplied size and mode. 16567 * 16568 * The mode must always be one of the following: 16569 * <ul> 16570 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16571 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16572 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16573 * </ul> 16574 * 16575 * @param size the size of the measure specification 16576 * @param mode the mode of the measure specification 16577 * @return the measure specification based on size and mode 16578 */ 16579 public static int makeMeasureSpec(int size, int mode) { 16580 return size + mode; 16581 } 16582 16583 /** 16584 * Extracts the mode from the supplied measure specification. 16585 * 16586 * @param measureSpec the measure specification to extract the mode from 16587 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16588 * {@link android.view.View.MeasureSpec#AT_MOST} or 16589 * {@link android.view.View.MeasureSpec#EXACTLY} 16590 */ 16591 public static int getMode(int measureSpec) { 16592 return (measureSpec & MODE_MASK); 16593 } 16594 16595 /** 16596 * Extracts the size from the supplied measure specification. 16597 * 16598 * @param measureSpec the measure specification to extract the size from 16599 * @return the size in pixels defined in the supplied measure specification 16600 */ 16601 public static int getSize(int measureSpec) { 16602 return (measureSpec & ~MODE_MASK); 16603 } 16604 16605 /** 16606 * Returns a String representation of the specified measure 16607 * specification. 16608 * 16609 * @param measureSpec the measure specification to convert to a String 16610 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16611 */ 16612 public static String toString(int measureSpec) { 16613 int mode = getMode(measureSpec); 16614 int size = getSize(measureSpec); 16615 16616 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16617 16618 if (mode == UNSPECIFIED) 16619 sb.append("UNSPECIFIED "); 16620 else if (mode == EXACTLY) 16621 sb.append("EXACTLY "); 16622 else if (mode == AT_MOST) 16623 sb.append("AT_MOST "); 16624 else 16625 sb.append(mode).append(" "); 16626 16627 sb.append(size); 16628 return sb.toString(); 16629 } 16630 } 16631 16632 class CheckForLongPress implements Runnable { 16633 16634 private int mOriginalWindowAttachCount; 16635 16636 public void run() { 16637 if (isPressed() && (mParent != null) 16638 && mOriginalWindowAttachCount == mWindowAttachCount) { 16639 if (performLongClick()) { 16640 mHasPerformedLongPress = true; 16641 } 16642 } 16643 } 16644 16645 public void rememberWindowAttachCount() { 16646 mOriginalWindowAttachCount = mWindowAttachCount; 16647 } 16648 } 16649 16650 private final class CheckForTap implements Runnable { 16651 public void run() { 16652 mPrivateFlags &= ~PREPRESSED; 16653 setPressed(true); 16654 checkForLongClick(ViewConfiguration.getTapTimeout()); 16655 } 16656 } 16657 16658 private final class PerformClick implements Runnable { 16659 public void run() { 16660 performClick(); 16661 } 16662 } 16663 16664 /** @hide */ 16665 public void hackTurnOffWindowResizeAnim(boolean off) { 16666 mAttachInfo.mTurnOffWindowResizeAnim = off; 16667 } 16668 16669 /** 16670 * This method returns a ViewPropertyAnimator object, which can be used to animate 16671 * specific properties on this View. 16672 * 16673 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16674 */ 16675 public ViewPropertyAnimator animate() { 16676 if (mAnimator == null) { 16677 mAnimator = new ViewPropertyAnimator(this); 16678 } 16679 return mAnimator; 16680 } 16681 16682 /** 16683 * Interface definition for a callback to be invoked when a key event is 16684 * dispatched to this view. The callback will be invoked before the key 16685 * event is given to the view. 16686 */ 16687 public interface OnKeyListener { 16688 /** 16689 * Called when a key is dispatched to a view. This allows listeners to 16690 * get a chance to respond before the target view. 16691 * 16692 * @param v The view the key has been dispatched to. 16693 * @param keyCode The code for the physical key that was pressed 16694 * @param event The KeyEvent object containing full information about 16695 * the event. 16696 * @return True if the listener has consumed the event, false otherwise. 16697 */ 16698 boolean onKey(View v, int keyCode, KeyEvent event); 16699 } 16700 16701 /** 16702 * Interface definition for a callback to be invoked when a touch event is 16703 * dispatched to this view. The callback will be invoked before the touch 16704 * event is given to the view. 16705 */ 16706 public interface OnTouchListener { 16707 /** 16708 * Called when a touch event is dispatched to a view. This allows listeners to 16709 * get a chance to respond before the target view. 16710 * 16711 * @param v The view the touch event has been dispatched to. 16712 * @param event The MotionEvent object containing full information about 16713 * the event. 16714 * @return True if the listener has consumed the event, false otherwise. 16715 */ 16716 boolean onTouch(View v, MotionEvent event); 16717 } 16718 16719 /** 16720 * Interface definition for a callback to be invoked when a hover event is 16721 * dispatched to this view. The callback will be invoked before the hover 16722 * event is given to the view. 16723 */ 16724 public interface OnHoverListener { 16725 /** 16726 * Called when a hover event is dispatched to a view. This allows listeners to 16727 * get a chance to respond before the target view. 16728 * 16729 * @param v The view the hover event has been dispatched to. 16730 * @param event The MotionEvent object containing full information about 16731 * the event. 16732 * @return True if the listener has consumed the event, false otherwise. 16733 */ 16734 boolean onHover(View v, MotionEvent event); 16735 } 16736 16737 /** 16738 * Interface definition for a callback to be invoked when a generic motion event is 16739 * dispatched to this view. The callback will be invoked before the generic motion 16740 * event is given to the view. 16741 */ 16742 public interface OnGenericMotionListener { 16743 /** 16744 * Called when a generic motion event is dispatched to a view. This allows listeners to 16745 * get a chance to respond before the target view. 16746 * 16747 * @param v The view the generic motion event has been dispatched to. 16748 * @param event The MotionEvent object containing full information about 16749 * the event. 16750 * @return True if the listener has consumed the event, false otherwise. 16751 */ 16752 boolean onGenericMotion(View v, MotionEvent event); 16753 } 16754 16755 /** 16756 * Interface definition for a callback to be invoked when a view has been clicked and held. 16757 */ 16758 public interface OnLongClickListener { 16759 /** 16760 * Called when a view has been clicked and held. 16761 * 16762 * @param v The view that was clicked and held. 16763 * 16764 * @return true if the callback consumed the long click, false otherwise. 16765 */ 16766 boolean onLongClick(View v); 16767 } 16768 16769 /** 16770 * Interface definition for a callback to be invoked when a drag is being dispatched 16771 * to this view. The callback will be invoked before the hosting view's own 16772 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16773 * onDrag(event) behavior, it should return 'false' from this callback. 16774 * 16775 * <div class="special reference"> 16776 * <h3>Developer Guides</h3> 16777 * <p>For a guide to implementing drag and drop features, read the 16778 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16779 * </div> 16780 */ 16781 public interface OnDragListener { 16782 /** 16783 * Called when a drag event is dispatched to a view. This allows listeners 16784 * to get a chance to override base View behavior. 16785 * 16786 * @param v The View that received the drag event. 16787 * @param event The {@link android.view.DragEvent} object for the drag event. 16788 * @return {@code true} if the drag event was handled successfully, or {@code false} 16789 * if the drag event was not handled. Note that {@code false} will trigger the View 16790 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16791 */ 16792 boolean onDrag(View v, DragEvent event); 16793 } 16794 16795 /** 16796 * Interface definition for a callback to be invoked when the focus state of 16797 * a view changed. 16798 */ 16799 public interface OnFocusChangeListener { 16800 /** 16801 * Called when the focus state of a view has changed. 16802 * 16803 * @param v The view whose state has changed. 16804 * @param hasFocus The new focus state of v. 16805 */ 16806 void onFocusChange(View v, boolean hasFocus); 16807 } 16808 16809 /** 16810 * Interface definition for a callback to be invoked when a view is clicked. 16811 */ 16812 public interface OnClickListener { 16813 /** 16814 * Called when a view has been clicked. 16815 * 16816 * @param v The view that was clicked. 16817 */ 16818 void onClick(View v); 16819 } 16820 16821 /** 16822 * Interface definition for a callback to be invoked when the context menu 16823 * for this view is being built. 16824 */ 16825 public interface OnCreateContextMenuListener { 16826 /** 16827 * Called when the context menu for this view is being built. It is not 16828 * safe to hold onto the menu after this method returns. 16829 * 16830 * @param menu The context menu that is being built 16831 * @param v The view for which the context menu is being built 16832 * @param menuInfo Extra information about the item for which the 16833 * context menu should be shown. This information will vary 16834 * depending on the class of v. 16835 */ 16836 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16837 } 16838 16839 /** 16840 * Interface definition for a callback to be invoked when the status bar changes 16841 * visibility. This reports <strong>global</strong> changes to the system UI 16842 * state, not just what the application is requesting. 16843 * 16844 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16845 */ 16846 public interface OnSystemUiVisibilityChangeListener { 16847 /** 16848 * Called when the status bar changes visibility because of a call to 16849 * {@link View#setSystemUiVisibility(int)}. 16850 * 16851 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 16852 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. This tells you the 16853 * <strong>global</strong> state of the UI visibility flags, not what your 16854 * app is currently applying. 16855 */ 16856 public void onSystemUiVisibilityChange(int visibility); 16857 } 16858 16859 /** 16860 * Interface definition for a callback to be invoked when this view is attached 16861 * or detached from its window. 16862 */ 16863 public interface OnAttachStateChangeListener { 16864 /** 16865 * Called when the view is attached to a window. 16866 * @param v The view that was attached 16867 */ 16868 public void onViewAttachedToWindow(View v); 16869 /** 16870 * Called when the view is detached from a window. 16871 * @param v The view that was detached 16872 */ 16873 public void onViewDetachedFromWindow(View v); 16874 } 16875 16876 private final class UnsetPressedState implements Runnable { 16877 public void run() { 16878 setPressed(false); 16879 } 16880 } 16881 16882 /** 16883 * Base class for derived classes that want to save and restore their own 16884 * state in {@link android.view.View#onSaveInstanceState()}. 16885 */ 16886 public static class BaseSavedState extends AbsSavedState { 16887 /** 16888 * Constructor used when reading from a parcel. Reads the state of the superclass. 16889 * 16890 * @param source 16891 */ 16892 public BaseSavedState(Parcel source) { 16893 super(source); 16894 } 16895 16896 /** 16897 * Constructor called by derived classes when creating their SavedState objects 16898 * 16899 * @param superState The state of the superclass of this view 16900 */ 16901 public BaseSavedState(Parcelable superState) { 16902 super(superState); 16903 } 16904 16905 public static final Parcelable.Creator<BaseSavedState> CREATOR = 16906 new Parcelable.Creator<BaseSavedState>() { 16907 public BaseSavedState createFromParcel(Parcel in) { 16908 return new BaseSavedState(in); 16909 } 16910 16911 public BaseSavedState[] newArray(int size) { 16912 return new BaseSavedState[size]; 16913 } 16914 }; 16915 } 16916 16917 /** 16918 * A set of information given to a view when it is attached to its parent 16919 * window. 16920 */ 16921 static class AttachInfo { 16922 interface Callbacks { 16923 void playSoundEffect(int effectId); 16924 boolean performHapticFeedback(int effectId, boolean always); 16925 } 16926 16927 /** 16928 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 16929 * to a Handler. This class contains the target (View) to invalidate and 16930 * the coordinates of the dirty rectangle. 16931 * 16932 * For performance purposes, this class also implements a pool of up to 16933 * POOL_LIMIT objects that get reused. This reduces memory allocations 16934 * whenever possible. 16935 */ 16936 static class InvalidateInfo implements Poolable<InvalidateInfo> { 16937 private static final int POOL_LIMIT = 10; 16938 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 16939 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 16940 public InvalidateInfo newInstance() { 16941 return new InvalidateInfo(); 16942 } 16943 16944 public void onAcquired(InvalidateInfo element) { 16945 } 16946 16947 public void onReleased(InvalidateInfo element) { 16948 element.target = null; 16949 } 16950 }, POOL_LIMIT) 16951 ); 16952 16953 private InvalidateInfo mNext; 16954 private boolean mIsPooled; 16955 16956 View target; 16957 16958 int left; 16959 int top; 16960 int right; 16961 int bottom; 16962 16963 public void setNextPoolable(InvalidateInfo element) { 16964 mNext = element; 16965 } 16966 16967 public InvalidateInfo getNextPoolable() { 16968 return mNext; 16969 } 16970 16971 static InvalidateInfo acquire() { 16972 return sPool.acquire(); 16973 } 16974 16975 void release() { 16976 sPool.release(this); 16977 } 16978 16979 public boolean isPooled() { 16980 return mIsPooled; 16981 } 16982 16983 public void setPooled(boolean isPooled) { 16984 mIsPooled = isPooled; 16985 } 16986 } 16987 16988 final IWindowSession mSession; 16989 16990 final IWindow mWindow; 16991 16992 final IBinder mWindowToken; 16993 16994 final Callbacks mRootCallbacks; 16995 16996 HardwareCanvas mHardwareCanvas; 16997 16998 /** 16999 * The top view of the hierarchy. 17000 */ 17001 View mRootView; 17002 17003 IBinder mPanelParentWindowToken; 17004 Surface mSurface; 17005 17006 boolean mHardwareAccelerated; 17007 boolean mHardwareAccelerationRequested; 17008 HardwareRenderer mHardwareRenderer; 17009 17010 boolean mScreenOn; 17011 17012 /** 17013 * Scale factor used by the compatibility mode 17014 */ 17015 float mApplicationScale; 17016 17017 /** 17018 * Indicates whether the application is in compatibility mode 17019 */ 17020 boolean mScalingRequired; 17021 17022 /** 17023 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17024 */ 17025 boolean mTurnOffWindowResizeAnim; 17026 17027 /** 17028 * Left position of this view's window 17029 */ 17030 int mWindowLeft; 17031 17032 /** 17033 * Top position of this view's window 17034 */ 17035 int mWindowTop; 17036 17037 /** 17038 * Indicates whether views need to use 32-bit drawing caches 17039 */ 17040 boolean mUse32BitDrawingCache; 17041 17042 /** 17043 * Describes the parts of the window that are currently completely 17044 * obscured by system UI elements. 17045 */ 17046 final Rect mSystemInsets = new Rect(); 17047 17048 /** 17049 * For windows that are full-screen but using insets to layout inside 17050 * of the screen decorations, these are the current insets for the 17051 * content of the window. 17052 */ 17053 final Rect mContentInsets = new Rect(); 17054 17055 /** 17056 * For windows that are full-screen but using insets to layout inside 17057 * of the screen decorations, these are the current insets for the 17058 * actual visible parts of the window. 17059 */ 17060 final Rect mVisibleInsets = new Rect(); 17061 17062 /** 17063 * The internal insets given by this window. This value is 17064 * supplied by the client (through 17065 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17066 * be given to the window manager when changed to be used in laying 17067 * out windows behind it. 17068 */ 17069 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17070 = new ViewTreeObserver.InternalInsetsInfo(); 17071 17072 /** 17073 * All views in the window's hierarchy that serve as scroll containers, 17074 * used to determine if the window can be resized or must be panned 17075 * to adjust for a soft input area. 17076 */ 17077 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17078 17079 final KeyEvent.DispatcherState mKeyDispatchState 17080 = new KeyEvent.DispatcherState(); 17081 17082 /** 17083 * Indicates whether the view's window currently has the focus. 17084 */ 17085 boolean mHasWindowFocus; 17086 17087 /** 17088 * The current visibility of the window. 17089 */ 17090 int mWindowVisibility; 17091 17092 /** 17093 * Indicates the time at which drawing started to occur. 17094 */ 17095 long mDrawingTime; 17096 17097 /** 17098 * Indicates whether or not ignoring the DIRTY_MASK flags. 17099 */ 17100 boolean mIgnoreDirtyState; 17101 17102 /** 17103 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17104 * to avoid clearing that flag prematurely. 17105 */ 17106 boolean mSetIgnoreDirtyState = false; 17107 17108 /** 17109 * Indicates whether the view's window is currently in touch mode. 17110 */ 17111 boolean mInTouchMode; 17112 17113 /** 17114 * Indicates that ViewAncestor should trigger a global layout change 17115 * the next time it performs a traversal 17116 */ 17117 boolean mRecomputeGlobalAttributes; 17118 17119 /** 17120 * Always report new attributes at next traversal. 17121 */ 17122 boolean mForceReportNewAttributes; 17123 17124 /** 17125 * Set during a traveral if any views want to keep the screen on. 17126 */ 17127 boolean mKeepScreenOn; 17128 17129 /** 17130 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17131 */ 17132 int mSystemUiVisibility; 17133 17134 /** 17135 * Hack to force certain system UI visibility flags to be cleared. 17136 */ 17137 int mDisabledSystemUiVisibility; 17138 17139 /** 17140 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17141 * attached. 17142 */ 17143 boolean mHasSystemUiListeners; 17144 17145 /** 17146 * Set if the visibility of any views has changed. 17147 */ 17148 boolean mViewVisibilityChanged; 17149 17150 /** 17151 * Set to true if a view has been scrolled. 17152 */ 17153 boolean mViewScrollChanged; 17154 17155 /** 17156 * Global to the view hierarchy used as a temporary for dealing with 17157 * x/y points in the transparent region computations. 17158 */ 17159 final int[] mTransparentLocation = new int[2]; 17160 17161 /** 17162 * Global to the view hierarchy used as a temporary for dealing with 17163 * x/y points in the ViewGroup.invalidateChild implementation. 17164 */ 17165 final int[] mInvalidateChildLocation = new int[2]; 17166 17167 17168 /** 17169 * Global to the view hierarchy used as a temporary for dealing with 17170 * x/y location when view is transformed. 17171 */ 17172 final float[] mTmpTransformLocation = new float[2]; 17173 17174 /** 17175 * The view tree observer used to dispatch global events like 17176 * layout, pre-draw, touch mode change, etc. 17177 */ 17178 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17179 17180 /** 17181 * A Canvas used by the view hierarchy to perform bitmap caching. 17182 */ 17183 Canvas mCanvas; 17184 17185 /** 17186 * The view root impl. 17187 */ 17188 final ViewRootImpl mViewRootImpl; 17189 17190 /** 17191 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17192 * handler can be used to pump events in the UI events queue. 17193 */ 17194 final Handler mHandler; 17195 17196 /** 17197 * Temporary for use in computing invalidate rectangles while 17198 * calling up the hierarchy. 17199 */ 17200 final Rect mTmpInvalRect = new Rect(); 17201 17202 /** 17203 * Temporary for use in computing hit areas with transformed views 17204 */ 17205 final RectF mTmpTransformRect = new RectF(); 17206 17207 /** 17208 * Temporary list for use in collecting focusable descendents of a view. 17209 */ 17210 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17211 17212 /** 17213 * The id of the window for accessibility purposes. 17214 */ 17215 int mAccessibilityWindowId = View.NO_ID; 17216 17217 /** 17218 * Whether to ingore not exposed for accessibility Views when 17219 * reporting the view tree to accessibility services. 17220 */ 17221 boolean mIncludeNotImportantViews; 17222 17223 /** 17224 * The drawable for highlighting accessibility focus. 17225 */ 17226 Drawable mAccessibilityFocusDrawable; 17227 17228 /** 17229 * Show where the margins, bounds and layout bounds are for each view. 17230 */ 17231 final boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17232 17233 /** 17234 * Point used to compute visible regions. 17235 */ 17236 final Point mPoint = new Point(); 17237 17238 /** 17239 * Creates a new set of attachment information with the specified 17240 * events handler and thread. 17241 * 17242 * @param handler the events handler the view must use 17243 */ 17244 AttachInfo(IWindowSession session, IWindow window, 17245 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17246 mSession = session; 17247 mWindow = window; 17248 mWindowToken = window.asBinder(); 17249 mViewRootImpl = viewRootImpl; 17250 mHandler = handler; 17251 mRootCallbacks = effectPlayer; 17252 } 17253 } 17254 17255 /** 17256 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17257 * is supported. This avoids keeping too many unused fields in most 17258 * instances of View.</p> 17259 */ 17260 private static class ScrollabilityCache implements Runnable { 17261 17262 /** 17263 * Scrollbars are not visible 17264 */ 17265 public static final int OFF = 0; 17266 17267 /** 17268 * Scrollbars are visible 17269 */ 17270 public static final int ON = 1; 17271 17272 /** 17273 * Scrollbars are fading away 17274 */ 17275 public static final int FADING = 2; 17276 17277 public boolean fadeScrollBars; 17278 17279 public int fadingEdgeLength; 17280 public int scrollBarDefaultDelayBeforeFade; 17281 public int scrollBarFadeDuration; 17282 17283 public int scrollBarSize; 17284 public ScrollBarDrawable scrollBar; 17285 public float[] interpolatorValues; 17286 public View host; 17287 17288 public final Paint paint; 17289 public final Matrix matrix; 17290 public Shader shader; 17291 17292 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17293 17294 private static final float[] OPAQUE = { 255 }; 17295 private static final float[] TRANSPARENT = { 0.0f }; 17296 17297 /** 17298 * When fading should start. This time moves into the future every time 17299 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17300 */ 17301 public long fadeStartTime; 17302 17303 17304 /** 17305 * The current state of the scrollbars: ON, OFF, or FADING 17306 */ 17307 public int state = OFF; 17308 17309 private int mLastColor; 17310 17311 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17312 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17313 scrollBarSize = configuration.getScaledScrollBarSize(); 17314 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17315 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17316 17317 paint = new Paint(); 17318 matrix = new Matrix(); 17319 // use use a height of 1, and then wack the matrix each time we 17320 // actually use it. 17321 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17322 17323 paint.setShader(shader); 17324 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17325 this.host = host; 17326 } 17327 17328 public void setFadeColor(int color) { 17329 if (color != 0 && color != mLastColor) { 17330 mLastColor = color; 17331 color |= 0xFF000000; 17332 17333 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17334 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17335 17336 paint.setShader(shader); 17337 // Restore the default transfer mode (src_over) 17338 paint.setXfermode(null); 17339 } 17340 } 17341 17342 public void run() { 17343 long now = AnimationUtils.currentAnimationTimeMillis(); 17344 if (now >= fadeStartTime) { 17345 17346 // the animation fades the scrollbars out by changing 17347 // the opacity (alpha) from fully opaque to fully 17348 // transparent 17349 int nextFrame = (int) now; 17350 int framesCount = 0; 17351 17352 Interpolator interpolator = scrollBarInterpolator; 17353 17354 // Start opaque 17355 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17356 17357 // End transparent 17358 nextFrame += scrollBarFadeDuration; 17359 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17360 17361 state = FADING; 17362 17363 // Kick off the fade animation 17364 host.invalidate(true); 17365 } 17366 } 17367 } 17368 17369 /** 17370 * Resuable callback for sending 17371 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17372 */ 17373 private class SendViewScrolledAccessibilityEvent implements Runnable { 17374 public volatile boolean mIsPending; 17375 17376 public void run() { 17377 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17378 mIsPending = false; 17379 } 17380 } 17381 17382 /** 17383 * <p> 17384 * This class represents a delegate that can be registered in a {@link View} 17385 * to enhance accessibility support via composition rather via inheritance. 17386 * It is specifically targeted to widget developers that extend basic View 17387 * classes i.e. classes in package android.view, that would like their 17388 * applications to be backwards compatible. 17389 * </p> 17390 * <div class="special reference"> 17391 * <h3>Developer Guides</h3> 17392 * <p>For more information about making applications accessible, read the 17393 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17394 * developer guide.</p> 17395 * </div> 17396 * <p> 17397 * A scenario in which a developer would like to use an accessibility delegate 17398 * is overriding a method introduced in a later API version then the minimal API 17399 * version supported by the application. For example, the method 17400 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17401 * in API version 4 when the accessibility APIs were first introduced. If a 17402 * developer would like his application to run on API version 4 devices (assuming 17403 * all other APIs used by the application are version 4 or lower) and take advantage 17404 * of this method, instead of overriding the method which would break the application's 17405 * backwards compatibility, he can override the corresponding method in this 17406 * delegate and register the delegate in the target View if the API version of 17407 * the system is high enough i.e. the API version is same or higher to the API 17408 * version that introduced 17409 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17410 * </p> 17411 * <p> 17412 * Here is an example implementation: 17413 * </p> 17414 * <code><pre><p> 17415 * if (Build.VERSION.SDK_INT >= 14) { 17416 * // If the API version is equal of higher than the version in 17417 * // which onInitializeAccessibilityNodeInfo was introduced we 17418 * // register a delegate with a customized implementation. 17419 * View view = findViewById(R.id.view_id); 17420 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17421 * public void onInitializeAccessibilityNodeInfo(View host, 17422 * AccessibilityNodeInfo info) { 17423 * // Let the default implementation populate the info. 17424 * super.onInitializeAccessibilityNodeInfo(host, info); 17425 * // Set some other information. 17426 * info.setEnabled(host.isEnabled()); 17427 * } 17428 * }); 17429 * } 17430 * </code></pre></p> 17431 * <p> 17432 * This delegate contains methods that correspond to the accessibility methods 17433 * in View. If a delegate has been specified the implementation in View hands 17434 * off handling to the corresponding method in this delegate. The default 17435 * implementation the delegate methods behaves exactly as the corresponding 17436 * method in View for the case of no accessibility delegate been set. Hence, 17437 * to customize the behavior of a View method, clients can override only the 17438 * corresponding delegate method without altering the behavior of the rest 17439 * accessibility related methods of the host view. 17440 * </p> 17441 */ 17442 public static class AccessibilityDelegate { 17443 17444 /** 17445 * Sends an accessibility event of the given type. If accessibility is not 17446 * enabled this method has no effect. 17447 * <p> 17448 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17449 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17450 * been set. 17451 * </p> 17452 * 17453 * @param host The View hosting the delegate. 17454 * @param eventType The type of the event to send. 17455 * 17456 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17457 */ 17458 public void sendAccessibilityEvent(View host, int eventType) { 17459 host.sendAccessibilityEventInternal(eventType); 17460 } 17461 17462 /** 17463 * Sends an accessibility event. This method behaves exactly as 17464 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17465 * empty {@link AccessibilityEvent} and does not perform a check whether 17466 * accessibility is enabled. 17467 * <p> 17468 * The default implementation behaves as 17469 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17470 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17471 * the case of no accessibility delegate been set. 17472 * </p> 17473 * 17474 * @param host The View hosting the delegate. 17475 * @param event The event to send. 17476 * 17477 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17478 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17479 */ 17480 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17481 host.sendAccessibilityEventUncheckedInternal(event); 17482 } 17483 17484 /** 17485 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17486 * to its children for adding their text content to the event. 17487 * <p> 17488 * The default implementation behaves as 17489 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17490 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17491 * the case of no accessibility delegate been set. 17492 * </p> 17493 * 17494 * @param host The View hosting the delegate. 17495 * @param event The event. 17496 * @return True if the event population was completed. 17497 * 17498 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17499 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17500 */ 17501 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17502 return host.dispatchPopulateAccessibilityEventInternal(event); 17503 } 17504 17505 /** 17506 * Gives a chance to the host View to populate the accessibility event with its 17507 * text content. 17508 * <p> 17509 * The default implementation behaves as 17510 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17511 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17512 * the case of no accessibility delegate been set. 17513 * </p> 17514 * 17515 * @param host The View hosting the delegate. 17516 * @param event The accessibility event which to populate. 17517 * 17518 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17519 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17520 */ 17521 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17522 host.onPopulateAccessibilityEventInternal(event); 17523 } 17524 17525 /** 17526 * Initializes an {@link AccessibilityEvent} with information about the 17527 * the host View which is the event source. 17528 * <p> 17529 * The default implementation behaves as 17530 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17531 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17532 * the case of no accessibility delegate been set. 17533 * </p> 17534 * 17535 * @param host The View hosting the delegate. 17536 * @param event The event to initialize. 17537 * 17538 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17539 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17540 */ 17541 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17542 host.onInitializeAccessibilityEventInternal(event); 17543 } 17544 17545 /** 17546 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17547 * <p> 17548 * The default implementation behaves as 17549 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17550 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17551 * the case of no accessibility delegate been set. 17552 * </p> 17553 * 17554 * @param host The View hosting the delegate. 17555 * @param info The instance to initialize. 17556 * 17557 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17558 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17559 */ 17560 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17561 host.onInitializeAccessibilityNodeInfoInternal(info); 17562 } 17563 17564 /** 17565 * Called when a child of the host View has requested sending an 17566 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17567 * to augment the event. 17568 * <p> 17569 * The default implementation behaves as 17570 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17571 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17572 * the case of no accessibility delegate been set. 17573 * </p> 17574 * 17575 * @param host The View hosting the delegate. 17576 * @param child The child which requests sending the event. 17577 * @param event The event to be sent. 17578 * @return True if the event should be sent 17579 * 17580 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17581 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17582 */ 17583 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17584 AccessibilityEvent event) { 17585 return host.onRequestSendAccessibilityEventInternal(child, event); 17586 } 17587 17588 /** 17589 * Gets the provider for managing a virtual view hierarchy rooted at this View 17590 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17591 * that explore the window content. 17592 * <p> 17593 * The default implementation behaves as 17594 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17595 * the case of no accessibility delegate been set. 17596 * </p> 17597 * 17598 * @return The provider. 17599 * 17600 * @see AccessibilityNodeProvider 17601 */ 17602 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17603 return null; 17604 } 17605 } 17606} 17607