View.java revision f40628645df750991ced8dde803dd57225fca04f
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 /** 2132 * Flag indicating that view has an animation set on it. This is used to track whether an 2133 * animation is cleared between successive frames, in order to tell the associated 2134 * DisplayList to clear its animation matrix. 2135 */ 2136 static final int VIEW_IS_ANIMATING_TRANSFORM = 0x10000000; 2137 2138 /** 2139 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2140 * is used to check whether later changes to the view's transform should invalidate the 2141 * view to force the quickReject test to run again. 2142 */ 2143 static final int VIEW_QUICK_REJECTED = 0x20000000; 2144 2145 /* End of masks for mPrivateFlags2 */ 2146 2147 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 2148 2149 /** 2150 * Always allow a user to over-scroll this view, provided it is a 2151 * view that can scroll. 2152 * 2153 * @see #getOverScrollMode() 2154 * @see #setOverScrollMode(int) 2155 */ 2156 public static final int OVER_SCROLL_ALWAYS = 0; 2157 2158 /** 2159 * Allow a user to over-scroll this view only if the content is large 2160 * enough to meaningfully scroll, provided it is a view that can scroll. 2161 * 2162 * @see #getOverScrollMode() 2163 * @see #setOverScrollMode(int) 2164 */ 2165 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2166 2167 /** 2168 * Never allow a user to over-scroll this view. 2169 * 2170 * @see #getOverScrollMode() 2171 * @see #setOverScrollMode(int) 2172 */ 2173 public static final int OVER_SCROLL_NEVER = 2; 2174 2175 /** 2176 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2177 * requested the system UI (status bar) to be visible (the default). 2178 * 2179 * @see #setSystemUiVisibility(int) 2180 */ 2181 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2182 2183 /** 2184 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2185 * system UI to enter an unobtrusive "low profile" mode. 2186 * 2187 * <p>This is for use in games, book readers, video players, or any other 2188 * "immersive" application where the usual system chrome is deemed too distracting. 2189 * 2190 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2191 * 2192 * @see #setSystemUiVisibility(int) 2193 */ 2194 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2195 2196 /** 2197 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2198 * system navigation be temporarily hidden. 2199 * 2200 * <p>This is an even less obtrusive state than that called for by 2201 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2202 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2203 * those to disappear. This is useful (in conjunction with the 2204 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2205 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2206 * window flags) for displaying content using every last pixel on the display. 2207 * 2208 * <p>There is a limitation: because navigation controls are so important, the least user 2209 * interaction will cause them to reappear immediately. When this happens, both 2210 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2211 * so that both elements reappear at the same time. 2212 * 2213 * @see #setSystemUiVisibility(int) 2214 */ 2215 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2216 2217 /** 2218 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2219 * into the normal fullscreen mode so that its content can take over the screen 2220 * while still allowing the user to interact with the application. 2221 * 2222 * <p>This has the same visual effect as 2223 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2224 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2225 * meaning that non-critical screen decorations (such as the status bar) will be 2226 * hidden while the user is in the View's window, focusing the experience on 2227 * that content. Unlike the window flag, if you are using ActionBar in 2228 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2229 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2230 * hide the action bar. 2231 * 2232 * <p>This approach to going fullscreen is best used over the window flag when 2233 * it is a transient state -- that is, the application does this at certain 2234 * points in its user interaction where it wants to allow the user to focus 2235 * on content, but not as a continuous state. For situations where the application 2236 * would like to simply stay full screen the entire time (such as a game that 2237 * wants to take over the screen), the 2238 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2239 * is usually a better approach. The state set here will be removed by the system 2240 * in various situations (such as the user moving to another application) like 2241 * the other system UI states. 2242 * 2243 * <p>When using this flag, the application should provide some easy facility 2244 * for the user to go out of it. A common example would be in an e-book 2245 * reader, where tapping on the screen brings back whatever screen and UI 2246 * decorations that had been hidden while the user was immersed in reading 2247 * the book. 2248 * 2249 * @see #setSystemUiVisibility(int) 2250 */ 2251 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2252 2253 /** 2254 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2255 * flags, we would like a stable view of the content insets given to 2256 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2257 * will always represent the worst case that the application can expect 2258 * as a continuous state. In the stock Android UI this is the space for 2259 * the system bar, nav bar, and status bar, but not more transient elements 2260 * such as an input method. 2261 * 2262 * The stable layout your UI sees is based on the system UI modes you can 2263 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2264 * then you will get a stable layout for changes of the 2265 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2266 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2267 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2268 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2269 * with a stable layout. (Note that you should avoid using 2270 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2271 * 2272 * If you have set the window flag {@ WindowManager.LayoutParams#FLAG_FULLSCREEN} 2273 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2274 * then a hidden status bar will be considered a "stable" state for purposes 2275 * here. This allows your UI to continually hide the status bar, while still 2276 * using the system UI flags to hide the action bar while still retaining 2277 * a stable layout. Note that changing the window fullscreen flag will never 2278 * provide a stable layout for a clean transition. 2279 * 2280 * <p>If you are using ActionBar in 2281 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2282 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2283 * insets it adds to those given to the application. 2284 */ 2285 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2286 2287 /** 2288 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2289 * to be layed out as if it has requested 2290 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2291 * allows it to avoid artifacts when switching in and out of that mode, at 2292 * the expense that some of its user interface may be covered by screen 2293 * decorations when they are shown. You can perform layout of your inner 2294 * UI elements to account for the navagation system UI through the 2295 * {@link #fitSystemWindows(Rect)} method. 2296 */ 2297 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2298 2299 /** 2300 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2301 * to be layed out as if it has requested 2302 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2303 * allows it to avoid artifacts when switching in and out of that mode, at 2304 * the expense that some of its user interface may be covered by screen 2305 * decorations when they are shown. You can perform layout of your inner 2306 * UI elements to account for non-fullscreen system UI through the 2307 * {@link #fitSystemWindows(Rect)} method. 2308 */ 2309 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2310 2311 /** 2312 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2313 */ 2314 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2315 2316 /** 2317 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2318 */ 2319 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 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 make the status bar not expandable. Unless you also 2328 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2329 */ 2330 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2331 2332 /** 2333 * @hide 2334 * 2335 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2336 * out of the public fields to keep the undefined bits out of the developer's way. 2337 * 2338 * Flag to hide notification icons and scrolling ticker text. 2339 */ 2340 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2341 2342 /** 2343 * @hide 2344 * 2345 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2346 * out of the public fields to keep the undefined bits out of the developer's way. 2347 * 2348 * Flag to disable incoming notification alerts. This will not block 2349 * icons, but it will block sound, vibrating and other visual or aural notifications. 2350 */ 2351 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2352 2353 /** 2354 * @hide 2355 * 2356 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2357 * out of the public fields to keep the undefined bits out of the developer's way. 2358 * 2359 * Flag to hide only the scrolling ticker. Note that 2360 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2361 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2362 */ 2363 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 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 the center system info area. 2372 */ 2373 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2374 2375 /** 2376 * @hide 2377 * 2378 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2379 * out of the public fields to keep the undefined bits out of the developer's way. 2380 * 2381 * Flag to hide only the home button. Don't use this 2382 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2383 */ 2384 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2385 2386 /** 2387 * @hide 2388 * 2389 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2390 * out of the public fields to keep the undefined bits out of the developer's way. 2391 * 2392 * Flag to hide only the back button. Don't use this 2393 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2394 */ 2395 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2396 2397 /** 2398 * @hide 2399 * 2400 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2401 * out of the public fields to keep the undefined bits out of the developer's way. 2402 * 2403 * Flag to hide only the clock. You might use this if your activity has 2404 * its own clock making the status bar's clock redundant. 2405 */ 2406 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2407 2408 /** 2409 * @hide 2410 * 2411 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2412 * out of the public fields to keep the undefined bits out of the developer's way. 2413 * 2414 * Flag to hide only the recent apps button. Don't use this 2415 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2416 */ 2417 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2418 2419 /** 2420 * @hide 2421 */ 2422 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2423 2424 /** 2425 * These are the system UI flags that can be cleared by events outside 2426 * of an application. Currently this is just the ability to tap on the 2427 * screen while hiding the navigation bar to have it return. 2428 * @hide 2429 */ 2430 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2431 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2432 | SYSTEM_UI_FLAG_FULLSCREEN; 2433 2434 /** 2435 * Flags that can impact the layout in relation to system UI. 2436 */ 2437 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2438 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2439 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2440 2441 /** 2442 * Find views that render the specified text. 2443 * 2444 * @see #findViewsWithText(ArrayList, CharSequence, int) 2445 */ 2446 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2447 2448 /** 2449 * Find find views that contain the specified content description. 2450 * 2451 * @see #findViewsWithText(ArrayList, CharSequence, int) 2452 */ 2453 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2454 2455 /** 2456 * Find views that contain {@link AccessibilityNodeProvider}. Such 2457 * a View is a root of virtual view hierarchy and may contain the searched 2458 * text. If this flag is set Views with providers are automatically 2459 * added and it is a responsibility of the client to call the APIs of 2460 * the provider to determine whether the virtual tree rooted at this View 2461 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2462 * represeting the virtual views with this text. 2463 * 2464 * @see #findViewsWithText(ArrayList, CharSequence, int) 2465 * 2466 * @hide 2467 */ 2468 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2469 2470 /** 2471 * Indicates that the screen has changed state and is now off. 2472 * 2473 * @see #onScreenStateChanged(int) 2474 */ 2475 public static final int SCREEN_STATE_OFF = 0x0; 2476 2477 /** 2478 * Indicates that the screen has changed state and is now on. 2479 * 2480 * @see #onScreenStateChanged(int) 2481 */ 2482 public static final int SCREEN_STATE_ON = 0x1; 2483 2484 /** 2485 * Controls the over-scroll mode for this view. 2486 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2487 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2488 * and {@link #OVER_SCROLL_NEVER}. 2489 */ 2490 private int mOverScrollMode; 2491 2492 /** 2493 * The parent this view is attached to. 2494 * {@hide} 2495 * 2496 * @see #getParent() 2497 */ 2498 protected ViewParent mParent; 2499 2500 /** 2501 * {@hide} 2502 */ 2503 AttachInfo mAttachInfo; 2504 2505 /** 2506 * {@hide} 2507 */ 2508 @ViewDebug.ExportedProperty(flagMapping = { 2509 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2510 name = "FORCE_LAYOUT"), 2511 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2512 name = "LAYOUT_REQUIRED"), 2513 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2514 name = "DRAWING_CACHE_INVALID", outputIf = false), 2515 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2516 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2517 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2518 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2519 }) 2520 int mPrivateFlags; 2521 int mPrivateFlags2; 2522 2523 /** 2524 * This view's request for the visibility of the status bar. 2525 * @hide 2526 */ 2527 @ViewDebug.ExportedProperty(flagMapping = { 2528 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2529 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2530 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2531 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2532 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2533 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2534 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2535 equals = SYSTEM_UI_FLAG_VISIBLE, 2536 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2537 }) 2538 int mSystemUiVisibility; 2539 2540 /** 2541 * Reference count for transient state. 2542 * @see #setHasTransientState(boolean) 2543 */ 2544 int mTransientStateCount = 0; 2545 2546 /** 2547 * Count of how many windows this view has been attached to. 2548 */ 2549 int mWindowAttachCount; 2550 2551 /** 2552 * The layout parameters associated with this view and used by the parent 2553 * {@link android.view.ViewGroup} to determine how this view should be 2554 * laid out. 2555 * {@hide} 2556 */ 2557 protected ViewGroup.LayoutParams mLayoutParams; 2558 2559 /** 2560 * The view flags hold various views states. 2561 * {@hide} 2562 */ 2563 @ViewDebug.ExportedProperty 2564 int mViewFlags; 2565 2566 static class TransformationInfo { 2567 /** 2568 * The transform matrix for the View. This transform is calculated internally 2569 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2570 * is used by default. Do *not* use this variable directly; instead call 2571 * getMatrix(), which will automatically recalculate the matrix if necessary 2572 * to get the correct matrix based on the latest rotation and scale properties. 2573 */ 2574 private final Matrix mMatrix = new Matrix(); 2575 2576 /** 2577 * The transform matrix for the View. This transform is calculated internally 2578 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2579 * is used by default. Do *not* use this variable directly; instead call 2580 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2581 * to get the correct matrix based on the latest rotation and scale properties. 2582 */ 2583 private Matrix mInverseMatrix; 2584 2585 /** 2586 * An internal variable that tracks whether we need to recalculate the 2587 * transform matrix, based on whether the rotation or scaleX/Y properties 2588 * have changed since the matrix was last calculated. 2589 */ 2590 boolean mMatrixDirty = false; 2591 2592 /** 2593 * An internal variable that tracks whether we need to recalculate the 2594 * transform matrix, based on whether the rotation or scaleX/Y properties 2595 * have changed since the matrix was last calculated. 2596 */ 2597 private boolean mInverseMatrixDirty = true; 2598 2599 /** 2600 * A variable that tracks whether we need to recalculate the 2601 * transform matrix, based on whether the rotation or scaleX/Y properties 2602 * have changed since the matrix was last calculated. This variable 2603 * is only valid after a call to updateMatrix() or to a function that 2604 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2605 */ 2606 private boolean mMatrixIsIdentity = true; 2607 2608 /** 2609 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2610 */ 2611 private Camera mCamera = null; 2612 2613 /** 2614 * This matrix is used when computing the matrix for 3D rotations. 2615 */ 2616 private Matrix matrix3D = null; 2617 2618 /** 2619 * These prev values are used to recalculate a centered pivot point when necessary. The 2620 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2621 * set), so thes values are only used then as well. 2622 */ 2623 private int mPrevWidth = -1; 2624 private int mPrevHeight = -1; 2625 2626 /** 2627 * The degrees rotation around the vertical axis through the pivot point. 2628 */ 2629 @ViewDebug.ExportedProperty 2630 float mRotationY = 0f; 2631 2632 /** 2633 * The degrees rotation around the horizontal axis through the pivot point. 2634 */ 2635 @ViewDebug.ExportedProperty 2636 float mRotationX = 0f; 2637 2638 /** 2639 * The degrees rotation around the pivot point. 2640 */ 2641 @ViewDebug.ExportedProperty 2642 float mRotation = 0f; 2643 2644 /** 2645 * The amount of translation of the object away from its left property (post-layout). 2646 */ 2647 @ViewDebug.ExportedProperty 2648 float mTranslationX = 0f; 2649 2650 /** 2651 * The amount of translation of the object away from its top property (post-layout). 2652 */ 2653 @ViewDebug.ExportedProperty 2654 float mTranslationY = 0f; 2655 2656 /** 2657 * The amount of scale in the x direction around the pivot point. A 2658 * value of 1 means no scaling is applied. 2659 */ 2660 @ViewDebug.ExportedProperty 2661 float mScaleX = 1f; 2662 2663 /** 2664 * The amount of scale in the y direction around the pivot point. A 2665 * value of 1 means no scaling is applied. 2666 */ 2667 @ViewDebug.ExportedProperty 2668 float mScaleY = 1f; 2669 2670 /** 2671 * The x location of the point around which the view is rotated and scaled. 2672 */ 2673 @ViewDebug.ExportedProperty 2674 float mPivotX = 0f; 2675 2676 /** 2677 * The y location of the point around which the view is rotated and scaled. 2678 */ 2679 @ViewDebug.ExportedProperty 2680 float mPivotY = 0f; 2681 2682 /** 2683 * The opacity of the View. This is a value from 0 to 1, where 0 means 2684 * completely transparent and 1 means completely opaque. 2685 */ 2686 @ViewDebug.ExportedProperty 2687 float mAlpha = 1f; 2688 } 2689 2690 TransformationInfo mTransformationInfo; 2691 2692 private boolean mLastIsOpaque; 2693 2694 /** 2695 * Convenience value to check for float values that are close enough to zero to be considered 2696 * zero. 2697 */ 2698 private static final float NONZERO_EPSILON = .001f; 2699 2700 /** 2701 * The distance in pixels from the left edge of this view's parent 2702 * to the left edge of this view. 2703 * {@hide} 2704 */ 2705 @ViewDebug.ExportedProperty(category = "layout") 2706 protected int mLeft; 2707 /** 2708 * The distance in pixels from the left edge of this view's parent 2709 * to the right edge of this view. 2710 * {@hide} 2711 */ 2712 @ViewDebug.ExportedProperty(category = "layout") 2713 protected int mRight; 2714 /** 2715 * The distance in pixels from the top edge of this view's parent 2716 * to the top edge of this view. 2717 * {@hide} 2718 */ 2719 @ViewDebug.ExportedProperty(category = "layout") 2720 protected int mTop; 2721 /** 2722 * The distance in pixels from the top edge of this view's parent 2723 * to the bottom edge of this view. 2724 * {@hide} 2725 */ 2726 @ViewDebug.ExportedProperty(category = "layout") 2727 protected int mBottom; 2728 2729 /** 2730 * The offset, in pixels, by which the content of this view is scrolled 2731 * horizontally. 2732 * {@hide} 2733 */ 2734 @ViewDebug.ExportedProperty(category = "scrolling") 2735 protected int mScrollX; 2736 /** 2737 * The offset, in pixels, by which the content of this view is scrolled 2738 * vertically. 2739 * {@hide} 2740 */ 2741 @ViewDebug.ExportedProperty(category = "scrolling") 2742 protected int mScrollY; 2743 2744 /** 2745 * The left padding in pixels, that is the distance in pixels between the 2746 * left edge of this view and the left edge of its content. 2747 * {@hide} 2748 */ 2749 @ViewDebug.ExportedProperty(category = "padding") 2750 protected int mPaddingLeft; 2751 /** 2752 * The right padding in pixels, that is the distance in pixels between the 2753 * right edge of this view and the right edge of its content. 2754 * {@hide} 2755 */ 2756 @ViewDebug.ExportedProperty(category = "padding") 2757 protected int mPaddingRight; 2758 /** 2759 * The top padding in pixels, that is the distance in pixels between the 2760 * top edge of this view and the top edge of its content. 2761 * {@hide} 2762 */ 2763 @ViewDebug.ExportedProperty(category = "padding") 2764 protected int mPaddingTop; 2765 /** 2766 * The bottom padding in pixels, that is the distance in pixels between the 2767 * bottom edge of this view and the bottom edge of its content. 2768 * {@hide} 2769 */ 2770 @ViewDebug.ExportedProperty(category = "padding") 2771 protected int mPaddingBottom; 2772 2773 /** 2774 * The layout insets in pixels, that is the distance in pixels between the 2775 * visible edges of this view its bounds. 2776 */ 2777 private Insets mLayoutInsets; 2778 2779 /** 2780 * Briefly describes the view and is primarily used for accessibility support. 2781 */ 2782 private CharSequence mContentDescription; 2783 2784 /** 2785 * Cache the paddingRight set by the user to append to the scrollbar's size. 2786 * 2787 * @hide 2788 */ 2789 @ViewDebug.ExportedProperty(category = "padding") 2790 protected int mUserPaddingRight; 2791 2792 /** 2793 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2794 * 2795 * @hide 2796 */ 2797 @ViewDebug.ExportedProperty(category = "padding") 2798 protected int mUserPaddingBottom; 2799 2800 /** 2801 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2802 * 2803 * @hide 2804 */ 2805 @ViewDebug.ExportedProperty(category = "padding") 2806 protected int mUserPaddingLeft; 2807 2808 /** 2809 * Cache if the user padding is relative. 2810 * 2811 */ 2812 @ViewDebug.ExportedProperty(category = "padding") 2813 boolean mUserPaddingRelative; 2814 2815 /** 2816 * Cache the paddingStart set by the user to append to the scrollbar's size. 2817 * 2818 */ 2819 @ViewDebug.ExportedProperty(category = "padding") 2820 int mUserPaddingStart; 2821 2822 /** 2823 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2824 * 2825 */ 2826 @ViewDebug.ExportedProperty(category = "padding") 2827 int mUserPaddingEnd; 2828 2829 /** 2830 * @hide 2831 */ 2832 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2833 /** 2834 * @hide 2835 */ 2836 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2837 2838 private Drawable mBackground; 2839 2840 private int mBackgroundResource; 2841 private boolean mBackgroundSizeChanged; 2842 2843 static class ListenerInfo { 2844 /** 2845 * Listener used to dispatch focus change events. 2846 * This field should be made private, so it is hidden from the SDK. 2847 * {@hide} 2848 */ 2849 protected OnFocusChangeListener mOnFocusChangeListener; 2850 2851 /** 2852 * Listeners for layout change events. 2853 */ 2854 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2855 2856 /** 2857 * Listeners for attach events. 2858 */ 2859 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2860 2861 /** 2862 * Listener used to dispatch click events. 2863 * This field should be made private, so it is hidden from the SDK. 2864 * {@hide} 2865 */ 2866 public OnClickListener mOnClickListener; 2867 2868 /** 2869 * Listener used to dispatch long click events. 2870 * This field should be made private, so it is hidden from the SDK. 2871 * {@hide} 2872 */ 2873 protected OnLongClickListener mOnLongClickListener; 2874 2875 /** 2876 * Listener used to build the context menu. 2877 * This field should be made private, so it is hidden from the SDK. 2878 * {@hide} 2879 */ 2880 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2881 2882 private OnKeyListener mOnKeyListener; 2883 2884 private OnTouchListener mOnTouchListener; 2885 2886 private OnHoverListener mOnHoverListener; 2887 2888 private OnGenericMotionListener mOnGenericMotionListener; 2889 2890 private OnDragListener mOnDragListener; 2891 2892 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2893 } 2894 2895 ListenerInfo mListenerInfo; 2896 2897 /** 2898 * The application environment this view lives in. 2899 * This field should be made private, so it is hidden from the SDK. 2900 * {@hide} 2901 */ 2902 protected Context mContext; 2903 2904 private final Resources mResources; 2905 2906 private ScrollabilityCache mScrollCache; 2907 2908 private int[] mDrawableState = null; 2909 2910 /** 2911 * Set to true when drawing cache is enabled and cannot be created. 2912 * 2913 * @hide 2914 */ 2915 public boolean mCachingFailed; 2916 2917 private Bitmap mDrawingCache; 2918 private Bitmap mUnscaledDrawingCache; 2919 private HardwareLayer mHardwareLayer; 2920 DisplayList mDisplayList; 2921 2922 /** 2923 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2924 * the user may specify which view to go to next. 2925 */ 2926 private int mNextFocusLeftId = View.NO_ID; 2927 2928 /** 2929 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2930 * the user may specify which view to go to next. 2931 */ 2932 private int mNextFocusRightId = View.NO_ID; 2933 2934 /** 2935 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2936 * the user may specify which view to go to next. 2937 */ 2938 private int mNextFocusUpId = View.NO_ID; 2939 2940 /** 2941 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2942 * the user may specify which view to go to next. 2943 */ 2944 private int mNextFocusDownId = View.NO_ID; 2945 2946 /** 2947 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2948 * the user may specify which view to go to next. 2949 */ 2950 int mNextFocusForwardId = View.NO_ID; 2951 2952 private CheckForLongPress mPendingCheckForLongPress; 2953 private CheckForTap mPendingCheckForTap = null; 2954 private PerformClick mPerformClick; 2955 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2956 2957 private UnsetPressedState mUnsetPressedState; 2958 2959 /** 2960 * Whether the long press's action has been invoked. The tap's action is invoked on the 2961 * up event while a long press is invoked as soon as the long press duration is reached, so 2962 * a long press could be performed before the tap is checked, in which case the tap's action 2963 * should not be invoked. 2964 */ 2965 private boolean mHasPerformedLongPress; 2966 2967 /** 2968 * The minimum height of the view. We'll try our best to have the height 2969 * of this view to at least this amount. 2970 */ 2971 @ViewDebug.ExportedProperty(category = "measurement") 2972 private int mMinHeight; 2973 2974 /** 2975 * The minimum width of the view. We'll try our best to have the width 2976 * of this view to at least this amount. 2977 */ 2978 @ViewDebug.ExportedProperty(category = "measurement") 2979 private int mMinWidth; 2980 2981 /** 2982 * The delegate to handle touch events that are physically in this view 2983 * but should be handled by another view. 2984 */ 2985 private TouchDelegate mTouchDelegate = null; 2986 2987 /** 2988 * Solid color to use as a background when creating the drawing cache. Enables 2989 * the cache to use 16 bit bitmaps instead of 32 bit. 2990 */ 2991 private int mDrawingCacheBackgroundColor = 0; 2992 2993 /** 2994 * Special tree observer used when mAttachInfo is null. 2995 */ 2996 private ViewTreeObserver mFloatingTreeObserver; 2997 2998 /** 2999 * Cache the touch slop from the context that created the view. 3000 */ 3001 private int mTouchSlop; 3002 3003 /** 3004 * Object that handles automatic animation of view properties. 3005 */ 3006 private ViewPropertyAnimator mAnimator = null; 3007 3008 /** 3009 * Flag indicating that a drag can cross window boundaries. When 3010 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 3011 * with this flag set, all visible applications will be able to participate 3012 * in the drag operation and receive the dragged content. 3013 * 3014 * @hide 3015 */ 3016 public static final int DRAG_FLAG_GLOBAL = 1; 3017 3018 /** 3019 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3020 */ 3021 private float mVerticalScrollFactor; 3022 3023 /** 3024 * Position of the vertical scroll bar. 3025 */ 3026 private int mVerticalScrollbarPosition; 3027 3028 /** 3029 * Position the scroll bar at the default position as determined by the system. 3030 */ 3031 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3032 3033 /** 3034 * Position the scroll bar along the left edge. 3035 */ 3036 public static final int SCROLLBAR_POSITION_LEFT = 1; 3037 3038 /** 3039 * Position the scroll bar along the right edge. 3040 */ 3041 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3042 3043 /** 3044 * Indicates that the view does not have a layer. 3045 * 3046 * @see #getLayerType() 3047 * @see #setLayerType(int, android.graphics.Paint) 3048 * @see #LAYER_TYPE_SOFTWARE 3049 * @see #LAYER_TYPE_HARDWARE 3050 */ 3051 public static final int LAYER_TYPE_NONE = 0; 3052 3053 /** 3054 * <p>Indicates that the view has a software layer. A software layer is backed 3055 * by a bitmap and causes the view to be rendered using Android's software 3056 * rendering pipeline, even if hardware acceleration is enabled.</p> 3057 * 3058 * <p>Software layers have various usages:</p> 3059 * <p>When the application is not using hardware acceleration, a software layer 3060 * is useful to apply a specific color filter and/or blending mode and/or 3061 * translucency to a view and all its children.</p> 3062 * <p>When the application is using hardware acceleration, a software layer 3063 * is useful to render drawing primitives not supported by the hardware 3064 * accelerated pipeline. It can also be used to cache a complex view tree 3065 * into a texture and reduce the complexity of drawing operations. For instance, 3066 * when animating a complex view tree with a translation, a software layer can 3067 * be used to render the view tree only once.</p> 3068 * <p>Software layers should be avoided when the affected view tree updates 3069 * often. Every update will require to re-render the software layer, which can 3070 * potentially be slow (particularly when hardware acceleration is turned on 3071 * since the layer will have to be uploaded into a hardware texture after every 3072 * update.)</p> 3073 * 3074 * @see #getLayerType() 3075 * @see #setLayerType(int, android.graphics.Paint) 3076 * @see #LAYER_TYPE_NONE 3077 * @see #LAYER_TYPE_HARDWARE 3078 */ 3079 public static final int LAYER_TYPE_SOFTWARE = 1; 3080 3081 /** 3082 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3083 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3084 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3085 * rendering pipeline, but only if hardware acceleration is turned on for the 3086 * view hierarchy. When hardware acceleration is turned off, hardware layers 3087 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3088 * 3089 * <p>A hardware layer is useful to apply a specific color filter and/or 3090 * blending mode and/or translucency to a view and all its children.</p> 3091 * <p>A hardware layer can be used to cache a complex view tree into a 3092 * texture and reduce the complexity of drawing operations. For instance, 3093 * when animating a complex view tree with a translation, a hardware layer can 3094 * be used to render the view tree only once.</p> 3095 * <p>A hardware layer can also be used to increase the rendering quality when 3096 * rotation transformations are applied on a view. It can also be used to 3097 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3098 * 3099 * @see #getLayerType() 3100 * @see #setLayerType(int, android.graphics.Paint) 3101 * @see #LAYER_TYPE_NONE 3102 * @see #LAYER_TYPE_SOFTWARE 3103 */ 3104 public static final int LAYER_TYPE_HARDWARE = 2; 3105 3106 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3107 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3108 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3109 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3110 }) 3111 int mLayerType = LAYER_TYPE_NONE; 3112 Paint mLayerPaint; 3113 Rect mLocalDirtyRect; 3114 3115 /** 3116 * Set to true when the view is sending hover accessibility events because it 3117 * is the innermost hovered view. 3118 */ 3119 private boolean mSendingHoverAccessibilityEvents; 3120 3121 /** 3122 * Simple constructor to use when creating a view from code. 3123 * 3124 * @param context The Context the view is running in, through which it can 3125 * access the current theme, resources, etc. 3126 */ 3127 public View(Context context) { 3128 mContext = context; 3129 mResources = context != null ? context.getResources() : null; 3130 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3131 // Set layout and text direction defaults 3132 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3133 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3134 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3135 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3136 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3137 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3138 mUserPaddingStart = -1; 3139 mUserPaddingEnd = -1; 3140 mUserPaddingRelative = false; 3141 } 3142 3143 /** 3144 * Delegate for injecting accessiblity functionality. 3145 */ 3146 AccessibilityDelegate mAccessibilityDelegate; 3147 3148 /** 3149 * Consistency verifier for debugging purposes. 3150 * @hide 3151 */ 3152 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3153 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3154 new InputEventConsistencyVerifier(this, 0) : null; 3155 3156 /** 3157 * Constructor that is called when inflating a view from XML. This is called 3158 * when a view is being constructed from an XML file, supplying attributes 3159 * that were specified in the XML file. This version uses a default style of 3160 * 0, so the only attribute values applied are those in the Context's Theme 3161 * and the given AttributeSet. 3162 * 3163 * <p> 3164 * The method onFinishInflate() will be called after all children have been 3165 * added. 3166 * 3167 * @param context The Context the view is running in, through which it can 3168 * access the current theme, resources, etc. 3169 * @param attrs The attributes of the XML tag that is inflating the view. 3170 * @see #View(Context, AttributeSet, int) 3171 */ 3172 public View(Context context, AttributeSet attrs) { 3173 this(context, attrs, 0); 3174 } 3175 3176 /** 3177 * Perform inflation from XML and apply a class-specific base style. This 3178 * constructor of View allows subclasses to use their own base style when 3179 * they are inflating. For example, a Button class's constructor would call 3180 * this version of the super class constructor and supply 3181 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3182 * the theme's button style to modify all of the base view attributes (in 3183 * particular its background) as well as the Button class's attributes. 3184 * 3185 * @param context The Context the view is running in, through which it can 3186 * access the current theme, resources, etc. 3187 * @param attrs The attributes of the XML tag that is inflating the view. 3188 * @param defStyle The default style to apply to this view. If 0, no style 3189 * will be applied (beyond what is included in the theme). This may 3190 * either be an attribute resource, whose value will be retrieved 3191 * from the current theme, or an explicit style resource. 3192 * @see #View(Context, AttributeSet) 3193 */ 3194 public View(Context context, AttributeSet attrs, int defStyle) { 3195 this(context); 3196 3197 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3198 defStyle, 0); 3199 3200 Drawable background = null; 3201 3202 int leftPadding = -1; 3203 int topPadding = -1; 3204 int rightPadding = -1; 3205 int bottomPadding = -1; 3206 int startPadding = -1; 3207 int endPadding = -1; 3208 3209 int padding = -1; 3210 3211 int viewFlagValues = 0; 3212 int viewFlagMasks = 0; 3213 3214 boolean setScrollContainer = false; 3215 3216 int x = 0; 3217 int y = 0; 3218 3219 float tx = 0; 3220 float ty = 0; 3221 float rotation = 0; 3222 float rotationX = 0; 3223 float rotationY = 0; 3224 float sx = 1f; 3225 float sy = 1f; 3226 boolean transformSet = false; 3227 3228 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3229 3230 int overScrollMode = mOverScrollMode; 3231 final int N = a.getIndexCount(); 3232 for (int i = 0; i < N; i++) { 3233 int attr = a.getIndex(i); 3234 switch (attr) { 3235 case com.android.internal.R.styleable.View_background: 3236 background = a.getDrawable(attr); 3237 break; 3238 case com.android.internal.R.styleable.View_padding: 3239 padding = a.getDimensionPixelSize(attr, -1); 3240 break; 3241 case com.android.internal.R.styleable.View_paddingLeft: 3242 leftPadding = a.getDimensionPixelSize(attr, -1); 3243 break; 3244 case com.android.internal.R.styleable.View_paddingTop: 3245 topPadding = a.getDimensionPixelSize(attr, -1); 3246 break; 3247 case com.android.internal.R.styleable.View_paddingRight: 3248 rightPadding = a.getDimensionPixelSize(attr, -1); 3249 break; 3250 case com.android.internal.R.styleable.View_paddingBottom: 3251 bottomPadding = a.getDimensionPixelSize(attr, -1); 3252 break; 3253 case com.android.internal.R.styleable.View_paddingStart: 3254 startPadding = a.getDimensionPixelSize(attr, -1); 3255 break; 3256 case com.android.internal.R.styleable.View_paddingEnd: 3257 endPadding = a.getDimensionPixelSize(attr, -1); 3258 break; 3259 case com.android.internal.R.styleable.View_scrollX: 3260 x = a.getDimensionPixelOffset(attr, 0); 3261 break; 3262 case com.android.internal.R.styleable.View_scrollY: 3263 y = a.getDimensionPixelOffset(attr, 0); 3264 break; 3265 case com.android.internal.R.styleable.View_alpha: 3266 setAlpha(a.getFloat(attr, 1f)); 3267 break; 3268 case com.android.internal.R.styleable.View_transformPivotX: 3269 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3270 break; 3271 case com.android.internal.R.styleable.View_transformPivotY: 3272 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3273 break; 3274 case com.android.internal.R.styleable.View_translationX: 3275 tx = a.getDimensionPixelOffset(attr, 0); 3276 transformSet = true; 3277 break; 3278 case com.android.internal.R.styleable.View_translationY: 3279 ty = a.getDimensionPixelOffset(attr, 0); 3280 transformSet = true; 3281 break; 3282 case com.android.internal.R.styleable.View_rotation: 3283 rotation = a.getFloat(attr, 0); 3284 transformSet = true; 3285 break; 3286 case com.android.internal.R.styleable.View_rotationX: 3287 rotationX = a.getFloat(attr, 0); 3288 transformSet = true; 3289 break; 3290 case com.android.internal.R.styleable.View_rotationY: 3291 rotationY = a.getFloat(attr, 0); 3292 transformSet = true; 3293 break; 3294 case com.android.internal.R.styleable.View_scaleX: 3295 sx = a.getFloat(attr, 1f); 3296 transformSet = true; 3297 break; 3298 case com.android.internal.R.styleable.View_scaleY: 3299 sy = a.getFloat(attr, 1f); 3300 transformSet = true; 3301 break; 3302 case com.android.internal.R.styleable.View_id: 3303 mID = a.getResourceId(attr, NO_ID); 3304 break; 3305 case com.android.internal.R.styleable.View_tag: 3306 mTag = a.getText(attr); 3307 break; 3308 case com.android.internal.R.styleable.View_fitsSystemWindows: 3309 if (a.getBoolean(attr, false)) { 3310 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3311 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3312 } 3313 break; 3314 case com.android.internal.R.styleable.View_focusable: 3315 if (a.getBoolean(attr, false)) { 3316 viewFlagValues |= FOCUSABLE; 3317 viewFlagMasks |= FOCUSABLE_MASK; 3318 } 3319 break; 3320 case com.android.internal.R.styleable.View_focusableInTouchMode: 3321 if (a.getBoolean(attr, false)) { 3322 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3323 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3324 } 3325 break; 3326 case com.android.internal.R.styleable.View_clickable: 3327 if (a.getBoolean(attr, false)) { 3328 viewFlagValues |= CLICKABLE; 3329 viewFlagMasks |= CLICKABLE; 3330 } 3331 break; 3332 case com.android.internal.R.styleable.View_longClickable: 3333 if (a.getBoolean(attr, false)) { 3334 viewFlagValues |= LONG_CLICKABLE; 3335 viewFlagMasks |= LONG_CLICKABLE; 3336 } 3337 break; 3338 case com.android.internal.R.styleable.View_saveEnabled: 3339 if (!a.getBoolean(attr, true)) { 3340 viewFlagValues |= SAVE_DISABLED; 3341 viewFlagMasks |= SAVE_DISABLED_MASK; 3342 } 3343 break; 3344 case com.android.internal.R.styleable.View_duplicateParentState: 3345 if (a.getBoolean(attr, false)) { 3346 viewFlagValues |= DUPLICATE_PARENT_STATE; 3347 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3348 } 3349 break; 3350 case com.android.internal.R.styleable.View_visibility: 3351 final int visibility = a.getInt(attr, 0); 3352 if (visibility != 0) { 3353 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3354 viewFlagMasks |= VISIBILITY_MASK; 3355 } 3356 break; 3357 case com.android.internal.R.styleable.View_layoutDirection: 3358 // Clear any layout direction flags (included resolved bits) already set 3359 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3360 // Set the layout direction flags depending on the value of the attribute 3361 final int layoutDirection = a.getInt(attr, -1); 3362 final int value = (layoutDirection != -1) ? 3363 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3364 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3365 break; 3366 case com.android.internal.R.styleable.View_drawingCacheQuality: 3367 final int cacheQuality = a.getInt(attr, 0); 3368 if (cacheQuality != 0) { 3369 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3370 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3371 } 3372 break; 3373 case com.android.internal.R.styleable.View_contentDescription: 3374 mContentDescription = a.getString(attr); 3375 break; 3376 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3377 if (!a.getBoolean(attr, true)) { 3378 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3379 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3380 } 3381 break; 3382 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3383 if (!a.getBoolean(attr, true)) { 3384 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3385 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3386 } 3387 break; 3388 case R.styleable.View_scrollbars: 3389 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3390 if (scrollbars != SCROLLBARS_NONE) { 3391 viewFlagValues |= scrollbars; 3392 viewFlagMasks |= SCROLLBARS_MASK; 3393 initializeScrollbars(a); 3394 } 3395 break; 3396 //noinspection deprecation 3397 case R.styleable.View_fadingEdge: 3398 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3399 // Ignore the attribute starting with ICS 3400 break; 3401 } 3402 // With builds < ICS, fall through and apply fading edges 3403 case R.styleable.View_requiresFadingEdge: 3404 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3405 if (fadingEdge != FADING_EDGE_NONE) { 3406 viewFlagValues |= fadingEdge; 3407 viewFlagMasks |= FADING_EDGE_MASK; 3408 initializeFadingEdge(a); 3409 } 3410 break; 3411 case R.styleable.View_scrollbarStyle: 3412 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3413 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3414 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3415 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3416 } 3417 break; 3418 case R.styleable.View_isScrollContainer: 3419 setScrollContainer = true; 3420 if (a.getBoolean(attr, false)) { 3421 setScrollContainer(true); 3422 } 3423 break; 3424 case com.android.internal.R.styleable.View_keepScreenOn: 3425 if (a.getBoolean(attr, false)) { 3426 viewFlagValues |= KEEP_SCREEN_ON; 3427 viewFlagMasks |= KEEP_SCREEN_ON; 3428 } 3429 break; 3430 case R.styleable.View_filterTouchesWhenObscured: 3431 if (a.getBoolean(attr, false)) { 3432 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3433 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3434 } 3435 break; 3436 case R.styleable.View_nextFocusLeft: 3437 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3438 break; 3439 case R.styleable.View_nextFocusRight: 3440 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3441 break; 3442 case R.styleable.View_nextFocusUp: 3443 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3444 break; 3445 case R.styleable.View_nextFocusDown: 3446 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3447 break; 3448 case R.styleable.View_nextFocusForward: 3449 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3450 break; 3451 case R.styleable.View_minWidth: 3452 mMinWidth = a.getDimensionPixelSize(attr, 0); 3453 break; 3454 case R.styleable.View_minHeight: 3455 mMinHeight = a.getDimensionPixelSize(attr, 0); 3456 break; 3457 case R.styleable.View_onClick: 3458 if (context.isRestricted()) { 3459 throw new IllegalStateException("The android:onClick attribute cannot " 3460 + "be used within a restricted context"); 3461 } 3462 3463 final String handlerName = a.getString(attr); 3464 if (handlerName != null) { 3465 setOnClickListener(new OnClickListener() { 3466 private Method mHandler; 3467 3468 public void onClick(View v) { 3469 if (mHandler == null) { 3470 try { 3471 mHandler = getContext().getClass().getMethod(handlerName, 3472 View.class); 3473 } catch (NoSuchMethodException e) { 3474 int id = getId(); 3475 String idText = id == NO_ID ? "" : " with id '" 3476 + getContext().getResources().getResourceEntryName( 3477 id) + "'"; 3478 throw new IllegalStateException("Could not find a method " + 3479 handlerName + "(View) in the activity " 3480 + getContext().getClass() + " for onClick handler" 3481 + " on view " + View.this.getClass() + idText, e); 3482 } 3483 } 3484 3485 try { 3486 mHandler.invoke(getContext(), View.this); 3487 } catch (IllegalAccessException e) { 3488 throw new IllegalStateException("Could not execute non " 3489 + "public method of the activity", e); 3490 } catch (InvocationTargetException e) { 3491 throw new IllegalStateException("Could not execute " 3492 + "method of the activity", e); 3493 } 3494 } 3495 }); 3496 } 3497 break; 3498 case R.styleable.View_overScrollMode: 3499 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3500 break; 3501 case R.styleable.View_verticalScrollbarPosition: 3502 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3503 break; 3504 case R.styleable.View_layerType: 3505 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3506 break; 3507 case R.styleable.View_textDirection: 3508 // Clear any text direction flag already set 3509 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3510 // Set the text direction flags depending on the value of the attribute 3511 final int textDirection = a.getInt(attr, -1); 3512 if (textDirection != -1) { 3513 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3514 } 3515 break; 3516 case R.styleable.View_textAlignment: 3517 // Clear any text alignment flag already set 3518 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3519 // Set the text alignment flag depending on the value of the attribute 3520 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3521 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3522 break; 3523 case R.styleable.View_importantForAccessibility: 3524 setImportantForAccessibility(a.getInt(attr, 3525 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3526 } 3527 } 3528 3529 a.recycle(); 3530 3531 setOverScrollMode(overScrollMode); 3532 3533 if (background != null) { 3534 setBackground(background); 3535 } 3536 3537 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3538 // layout direction). Those cached values will be used later during padding resolution. 3539 mUserPaddingStart = startPadding; 3540 mUserPaddingEnd = endPadding; 3541 3542 updateUserPaddingRelative(); 3543 3544 if (padding >= 0) { 3545 leftPadding = padding; 3546 topPadding = padding; 3547 rightPadding = padding; 3548 bottomPadding = padding; 3549 } 3550 3551 // If the user specified the padding (either with android:padding or 3552 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3553 // use the default padding or the padding from the background drawable 3554 // (stored at this point in mPadding*) 3555 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3556 topPadding >= 0 ? topPadding : mPaddingTop, 3557 rightPadding >= 0 ? rightPadding : mPaddingRight, 3558 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3559 3560 if (viewFlagMasks != 0) { 3561 setFlags(viewFlagValues, viewFlagMasks); 3562 } 3563 3564 // Needs to be called after mViewFlags is set 3565 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3566 recomputePadding(); 3567 } 3568 3569 if (x != 0 || y != 0) { 3570 scrollTo(x, y); 3571 } 3572 3573 if (transformSet) { 3574 setTranslationX(tx); 3575 setTranslationY(ty); 3576 setRotation(rotation); 3577 setRotationX(rotationX); 3578 setRotationY(rotationY); 3579 setScaleX(sx); 3580 setScaleY(sy); 3581 } 3582 3583 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3584 setScrollContainer(true); 3585 } 3586 3587 computeOpaqueFlags(); 3588 } 3589 3590 private void updateUserPaddingRelative() { 3591 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3592 } 3593 3594 /** 3595 * Non-public constructor for use in testing 3596 */ 3597 View() { 3598 mResources = null; 3599 } 3600 3601 /** 3602 * <p> 3603 * Initializes the fading edges from a given set of styled attributes. This 3604 * method should be called by subclasses that need fading edges and when an 3605 * instance of these subclasses is created programmatically rather than 3606 * being inflated from XML. This method is automatically called when the XML 3607 * is inflated. 3608 * </p> 3609 * 3610 * @param a the styled attributes set to initialize the fading edges from 3611 */ 3612 protected void initializeFadingEdge(TypedArray a) { 3613 initScrollCache(); 3614 3615 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3616 R.styleable.View_fadingEdgeLength, 3617 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3618 } 3619 3620 /** 3621 * Returns the size of the vertical faded edges used to indicate that more 3622 * content in this view is visible. 3623 * 3624 * @return The size in pixels of the vertical faded edge or 0 if vertical 3625 * faded edges are not enabled for this view. 3626 * @attr ref android.R.styleable#View_fadingEdgeLength 3627 */ 3628 public int getVerticalFadingEdgeLength() { 3629 if (isVerticalFadingEdgeEnabled()) { 3630 ScrollabilityCache cache = mScrollCache; 3631 if (cache != null) { 3632 return cache.fadingEdgeLength; 3633 } 3634 } 3635 return 0; 3636 } 3637 3638 /** 3639 * Set the size of the faded edge used to indicate that more content in this 3640 * view is available. Will not change whether the fading edge is enabled; use 3641 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3642 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3643 * for the vertical or horizontal fading edges. 3644 * 3645 * @param length The size in pixels of the faded edge used to indicate that more 3646 * content in this view is visible. 3647 */ 3648 public void setFadingEdgeLength(int length) { 3649 initScrollCache(); 3650 mScrollCache.fadingEdgeLength = length; 3651 } 3652 3653 /** 3654 * Returns the size of the horizontal faded edges used to indicate that more 3655 * content in this view is visible. 3656 * 3657 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3658 * faded edges are not enabled for this view. 3659 * @attr ref android.R.styleable#View_fadingEdgeLength 3660 */ 3661 public int getHorizontalFadingEdgeLength() { 3662 if (isHorizontalFadingEdgeEnabled()) { 3663 ScrollabilityCache cache = mScrollCache; 3664 if (cache != null) { 3665 return cache.fadingEdgeLength; 3666 } 3667 } 3668 return 0; 3669 } 3670 3671 /** 3672 * Returns the width of the vertical scrollbar. 3673 * 3674 * @return The width in pixels of the vertical scrollbar or 0 if there 3675 * is no vertical scrollbar. 3676 */ 3677 public int getVerticalScrollbarWidth() { 3678 ScrollabilityCache cache = mScrollCache; 3679 if (cache != null) { 3680 ScrollBarDrawable scrollBar = cache.scrollBar; 3681 if (scrollBar != null) { 3682 int size = scrollBar.getSize(true); 3683 if (size <= 0) { 3684 size = cache.scrollBarSize; 3685 } 3686 return size; 3687 } 3688 return 0; 3689 } 3690 return 0; 3691 } 3692 3693 /** 3694 * Returns the height of the horizontal scrollbar. 3695 * 3696 * @return The height in pixels of the horizontal scrollbar or 0 if 3697 * there is no horizontal scrollbar. 3698 */ 3699 protected int getHorizontalScrollbarHeight() { 3700 ScrollabilityCache cache = mScrollCache; 3701 if (cache != null) { 3702 ScrollBarDrawable scrollBar = cache.scrollBar; 3703 if (scrollBar != null) { 3704 int size = scrollBar.getSize(false); 3705 if (size <= 0) { 3706 size = cache.scrollBarSize; 3707 } 3708 return size; 3709 } 3710 return 0; 3711 } 3712 return 0; 3713 } 3714 3715 /** 3716 * <p> 3717 * Initializes the scrollbars from a given set of styled attributes. This 3718 * method should be called by subclasses that need scrollbars and when an 3719 * instance of these subclasses is created programmatically rather than 3720 * being inflated from XML. This method is automatically called when the XML 3721 * is inflated. 3722 * </p> 3723 * 3724 * @param a the styled attributes set to initialize the scrollbars from 3725 */ 3726 protected void initializeScrollbars(TypedArray a) { 3727 initScrollCache(); 3728 3729 final ScrollabilityCache scrollabilityCache = mScrollCache; 3730 3731 if (scrollabilityCache.scrollBar == null) { 3732 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3733 } 3734 3735 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3736 3737 if (!fadeScrollbars) { 3738 scrollabilityCache.state = ScrollabilityCache.ON; 3739 } 3740 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3741 3742 3743 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3744 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3745 .getScrollBarFadeDuration()); 3746 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3747 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3748 ViewConfiguration.getScrollDefaultDelay()); 3749 3750 3751 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3752 com.android.internal.R.styleable.View_scrollbarSize, 3753 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3754 3755 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3756 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3757 3758 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3759 if (thumb != null) { 3760 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3761 } 3762 3763 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3764 false); 3765 if (alwaysDraw) { 3766 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3767 } 3768 3769 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3770 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3771 3772 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3773 if (thumb != null) { 3774 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3775 } 3776 3777 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3778 false); 3779 if (alwaysDraw) { 3780 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3781 } 3782 3783 // Re-apply user/background padding so that scrollbar(s) get added 3784 resolvePadding(); 3785 } 3786 3787 /** 3788 * <p> 3789 * Initalizes the scrollability cache if necessary. 3790 * </p> 3791 */ 3792 private void initScrollCache() { 3793 if (mScrollCache == null) { 3794 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3795 } 3796 } 3797 3798 private ScrollabilityCache getScrollCache() { 3799 initScrollCache(); 3800 return mScrollCache; 3801 } 3802 3803 /** 3804 * Set the position of the vertical scroll bar. Should be one of 3805 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3806 * {@link #SCROLLBAR_POSITION_RIGHT}. 3807 * 3808 * @param position Where the vertical scroll bar should be positioned. 3809 */ 3810 public void setVerticalScrollbarPosition(int position) { 3811 if (mVerticalScrollbarPosition != position) { 3812 mVerticalScrollbarPosition = position; 3813 computeOpaqueFlags(); 3814 resolvePadding(); 3815 } 3816 } 3817 3818 /** 3819 * @return The position where the vertical scroll bar will show, if applicable. 3820 * @see #setVerticalScrollbarPosition(int) 3821 */ 3822 public int getVerticalScrollbarPosition() { 3823 return mVerticalScrollbarPosition; 3824 } 3825 3826 ListenerInfo getListenerInfo() { 3827 if (mListenerInfo != null) { 3828 return mListenerInfo; 3829 } 3830 mListenerInfo = new ListenerInfo(); 3831 return mListenerInfo; 3832 } 3833 3834 /** 3835 * Register a callback to be invoked when focus of this view changed. 3836 * 3837 * @param l The callback that will run. 3838 */ 3839 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3840 getListenerInfo().mOnFocusChangeListener = l; 3841 } 3842 3843 /** 3844 * Add a listener that will be called when the bounds of the view change due to 3845 * layout processing. 3846 * 3847 * @param listener The listener that will be called when layout bounds change. 3848 */ 3849 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3850 ListenerInfo li = getListenerInfo(); 3851 if (li.mOnLayoutChangeListeners == null) { 3852 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3853 } 3854 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3855 li.mOnLayoutChangeListeners.add(listener); 3856 } 3857 } 3858 3859 /** 3860 * Remove a listener for layout changes. 3861 * 3862 * @param listener The listener for layout bounds change. 3863 */ 3864 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3865 ListenerInfo li = mListenerInfo; 3866 if (li == null || li.mOnLayoutChangeListeners == null) { 3867 return; 3868 } 3869 li.mOnLayoutChangeListeners.remove(listener); 3870 } 3871 3872 /** 3873 * Add a listener for attach state changes. 3874 * 3875 * This listener will be called whenever this view is attached or detached 3876 * from a window. Remove the listener using 3877 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3878 * 3879 * @param listener Listener to attach 3880 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3881 */ 3882 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3883 ListenerInfo li = getListenerInfo(); 3884 if (li.mOnAttachStateChangeListeners == null) { 3885 li.mOnAttachStateChangeListeners 3886 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3887 } 3888 li.mOnAttachStateChangeListeners.add(listener); 3889 } 3890 3891 /** 3892 * Remove a listener for attach state changes. The listener will receive no further 3893 * notification of window attach/detach events. 3894 * 3895 * @param listener Listener to remove 3896 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3897 */ 3898 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3899 ListenerInfo li = mListenerInfo; 3900 if (li == null || li.mOnAttachStateChangeListeners == null) { 3901 return; 3902 } 3903 li.mOnAttachStateChangeListeners.remove(listener); 3904 } 3905 3906 /** 3907 * Returns the focus-change callback registered for this view. 3908 * 3909 * @return The callback, or null if one is not registered. 3910 */ 3911 public OnFocusChangeListener getOnFocusChangeListener() { 3912 ListenerInfo li = mListenerInfo; 3913 return li != null ? li.mOnFocusChangeListener : null; 3914 } 3915 3916 /** 3917 * Register a callback to be invoked when this view is clicked. If this view is not 3918 * clickable, it becomes clickable. 3919 * 3920 * @param l The callback that will run 3921 * 3922 * @see #setClickable(boolean) 3923 */ 3924 public void setOnClickListener(OnClickListener l) { 3925 if (!isClickable()) { 3926 setClickable(true); 3927 } 3928 getListenerInfo().mOnClickListener = l; 3929 } 3930 3931 /** 3932 * Return whether this view has an attached OnClickListener. Returns 3933 * true if there is a listener, false if there is none. 3934 */ 3935 public boolean hasOnClickListeners() { 3936 ListenerInfo li = mListenerInfo; 3937 return (li != null && li.mOnClickListener != null); 3938 } 3939 3940 /** 3941 * Register a callback to be invoked when this view is clicked and held. If this view is not 3942 * long clickable, it becomes long clickable. 3943 * 3944 * @param l The callback that will run 3945 * 3946 * @see #setLongClickable(boolean) 3947 */ 3948 public void setOnLongClickListener(OnLongClickListener l) { 3949 if (!isLongClickable()) { 3950 setLongClickable(true); 3951 } 3952 getListenerInfo().mOnLongClickListener = l; 3953 } 3954 3955 /** 3956 * Register a callback to be invoked when the context menu for this view is 3957 * being built. If this view is not long clickable, it becomes long clickable. 3958 * 3959 * @param l The callback that will run 3960 * 3961 */ 3962 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3963 if (!isLongClickable()) { 3964 setLongClickable(true); 3965 } 3966 getListenerInfo().mOnCreateContextMenuListener = l; 3967 } 3968 3969 /** 3970 * Call this view's OnClickListener, if it is defined. Performs all normal 3971 * actions associated with clicking: reporting accessibility event, playing 3972 * a sound, etc. 3973 * 3974 * @return True there was an assigned OnClickListener that was called, false 3975 * otherwise is returned. 3976 */ 3977 public boolean performClick() { 3978 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3979 3980 ListenerInfo li = mListenerInfo; 3981 if (li != null && li.mOnClickListener != null) { 3982 playSoundEffect(SoundEffectConstants.CLICK); 3983 li.mOnClickListener.onClick(this); 3984 return true; 3985 } 3986 3987 return false; 3988 } 3989 3990 /** 3991 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3992 * this only calls the listener, and does not do any associated clicking 3993 * actions like reporting an accessibility event. 3994 * 3995 * @return True there was an assigned OnClickListener that was called, false 3996 * otherwise is returned. 3997 */ 3998 public boolean callOnClick() { 3999 ListenerInfo li = mListenerInfo; 4000 if (li != null && li.mOnClickListener != null) { 4001 li.mOnClickListener.onClick(this); 4002 return true; 4003 } 4004 return false; 4005 } 4006 4007 /** 4008 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 4009 * OnLongClickListener did not consume the event. 4010 * 4011 * @return True if one of the above receivers consumed the event, false otherwise. 4012 */ 4013 public boolean performLongClick() { 4014 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4015 4016 boolean handled = false; 4017 ListenerInfo li = mListenerInfo; 4018 if (li != null && li.mOnLongClickListener != null) { 4019 handled = li.mOnLongClickListener.onLongClick(View.this); 4020 } 4021 if (!handled) { 4022 handled = showContextMenu(); 4023 } 4024 if (handled) { 4025 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4026 } 4027 return handled; 4028 } 4029 4030 /** 4031 * Performs button-related actions during a touch down event. 4032 * 4033 * @param event The event. 4034 * @return True if the down was consumed. 4035 * 4036 * @hide 4037 */ 4038 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4039 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4040 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4041 return true; 4042 } 4043 } 4044 return false; 4045 } 4046 4047 /** 4048 * Bring up the context menu for this view. 4049 * 4050 * @return Whether a context menu was displayed. 4051 */ 4052 public boolean showContextMenu() { 4053 return getParent().showContextMenuForChild(this); 4054 } 4055 4056 /** 4057 * Bring up the context menu for this view, referring to the item under the specified point. 4058 * 4059 * @param x The referenced x coordinate. 4060 * @param y The referenced y coordinate. 4061 * @param metaState The keyboard modifiers that were pressed. 4062 * @return Whether a context menu was displayed. 4063 * 4064 * @hide 4065 */ 4066 public boolean showContextMenu(float x, float y, int metaState) { 4067 return showContextMenu(); 4068 } 4069 4070 /** 4071 * Start an action mode. 4072 * 4073 * @param callback Callback that will control the lifecycle of the action mode 4074 * @return The new action mode if it is started, null otherwise 4075 * 4076 * @see ActionMode 4077 */ 4078 public ActionMode startActionMode(ActionMode.Callback callback) { 4079 ViewParent parent = getParent(); 4080 if (parent == null) return null; 4081 return parent.startActionModeForChild(this, callback); 4082 } 4083 4084 /** 4085 * Register a callback to be invoked when a key is pressed in this view. 4086 * @param l the key listener to attach to this view 4087 */ 4088 public void setOnKeyListener(OnKeyListener l) { 4089 getListenerInfo().mOnKeyListener = l; 4090 } 4091 4092 /** 4093 * Register a callback to be invoked when a touch event is sent to this view. 4094 * @param l the touch listener to attach to this view 4095 */ 4096 public void setOnTouchListener(OnTouchListener l) { 4097 getListenerInfo().mOnTouchListener = l; 4098 } 4099 4100 /** 4101 * Register a callback to be invoked when a generic motion event is sent to this view. 4102 * @param l the generic motion listener to attach to this view 4103 */ 4104 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4105 getListenerInfo().mOnGenericMotionListener = l; 4106 } 4107 4108 /** 4109 * Register a callback to be invoked when a hover event is sent to this view. 4110 * @param l the hover listener to attach to this view 4111 */ 4112 public void setOnHoverListener(OnHoverListener l) { 4113 getListenerInfo().mOnHoverListener = l; 4114 } 4115 4116 /** 4117 * Register a drag event listener callback object for this View. The parameter is 4118 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4119 * View, the system calls the 4120 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4121 * @param l An implementation of {@link android.view.View.OnDragListener}. 4122 */ 4123 public void setOnDragListener(OnDragListener l) { 4124 getListenerInfo().mOnDragListener = l; 4125 } 4126 4127 /** 4128 * Give this view focus. This will cause 4129 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4130 * 4131 * Note: this does not check whether this {@link View} should get focus, it just 4132 * gives it focus no matter what. It should only be called internally by framework 4133 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4134 * 4135 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4136 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4137 * focus moved when requestFocus() is called. It may not always 4138 * apply, in which case use the default View.FOCUS_DOWN. 4139 * @param previouslyFocusedRect The rectangle of the view that had focus 4140 * prior in this View's coordinate system. 4141 */ 4142 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4143 if (DBG) { 4144 System.out.println(this + " requestFocus()"); 4145 } 4146 4147 if ((mPrivateFlags & FOCUSED) == 0) { 4148 mPrivateFlags |= FOCUSED; 4149 4150 if (mParent != null) { 4151 mParent.requestChildFocus(this, this); 4152 } 4153 4154 onFocusChanged(true, direction, previouslyFocusedRect); 4155 refreshDrawableState(); 4156 4157 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4158 notifyAccessibilityStateChanged(); 4159 } 4160 } 4161 } 4162 4163 /** 4164 * Request that a rectangle of this view be visible on the screen, 4165 * scrolling if necessary just enough. 4166 * 4167 * <p>A View should call this if it maintains some notion of which part 4168 * of its content is interesting. For example, a text editing view 4169 * should call this when its cursor moves. 4170 * 4171 * @param rectangle The rectangle. 4172 * @return Whether any parent scrolled. 4173 */ 4174 public boolean requestRectangleOnScreen(Rect rectangle) { 4175 return requestRectangleOnScreen(rectangle, false); 4176 } 4177 4178 /** 4179 * Request that a rectangle of this view be visible on the screen, 4180 * scrolling if necessary just enough. 4181 * 4182 * <p>A View should call this if it maintains some notion of which part 4183 * of its content is interesting. For example, a text editing view 4184 * should call this when its cursor moves. 4185 * 4186 * <p>When <code>immediate</code> is set to true, scrolling will not be 4187 * animated. 4188 * 4189 * @param rectangle The rectangle. 4190 * @param immediate True to forbid animated scrolling, false otherwise 4191 * @return Whether any parent scrolled. 4192 */ 4193 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4194 View child = this; 4195 ViewParent parent = mParent; 4196 boolean scrolled = false; 4197 while (parent != null) { 4198 scrolled |= parent.requestChildRectangleOnScreen(child, 4199 rectangle, immediate); 4200 4201 // offset rect so next call has the rectangle in the 4202 // coordinate system of its direct child. 4203 rectangle.offset(child.getLeft(), child.getTop()); 4204 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4205 4206 if (!(parent instanceof View)) { 4207 break; 4208 } 4209 4210 child = (View) parent; 4211 parent = child.getParent(); 4212 } 4213 return scrolled; 4214 } 4215 4216 /** 4217 * Called when this view wants to give up focus. If focus is cleared 4218 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4219 * <p> 4220 * <strong>Note:</strong> When a View clears focus the framework is trying 4221 * to give focus to the first focusable View from the top. Hence, if this 4222 * View is the first from the top that can take focus, then all callbacks 4223 * related to clearing focus will be invoked after wich the framework will 4224 * give focus to this view. 4225 * </p> 4226 */ 4227 public void clearFocus() { 4228 if (DBG) { 4229 System.out.println(this + " clearFocus()"); 4230 } 4231 4232 if ((mPrivateFlags & FOCUSED) != 0) { 4233 mPrivateFlags &= ~FOCUSED; 4234 4235 if (mParent != null) { 4236 mParent.clearChildFocus(this); 4237 } 4238 4239 onFocusChanged(false, 0, null); 4240 4241 refreshDrawableState(); 4242 4243 ensureInputFocusOnFirstFocusable(); 4244 4245 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4246 notifyAccessibilityStateChanged(); 4247 } 4248 } 4249 } 4250 4251 void ensureInputFocusOnFirstFocusable() { 4252 View root = getRootView(); 4253 if (root != null) { 4254 root.requestFocus(); 4255 } 4256 } 4257 4258 /** 4259 * Called internally by the view system when a new view is getting focus. 4260 * This is what clears the old focus. 4261 */ 4262 void unFocus() { 4263 if (DBG) { 4264 System.out.println(this + " unFocus()"); 4265 } 4266 4267 if ((mPrivateFlags & FOCUSED) != 0) { 4268 mPrivateFlags &= ~FOCUSED; 4269 4270 onFocusChanged(false, 0, null); 4271 refreshDrawableState(); 4272 4273 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4274 notifyAccessibilityStateChanged(); 4275 } 4276 } 4277 } 4278 4279 /** 4280 * Returns true if this view has focus iteself, or is the ancestor of the 4281 * view that has focus. 4282 * 4283 * @return True if this view has or contains focus, false otherwise. 4284 */ 4285 @ViewDebug.ExportedProperty(category = "focus") 4286 public boolean hasFocus() { 4287 return (mPrivateFlags & FOCUSED) != 0; 4288 } 4289 4290 /** 4291 * Returns true if this view is focusable or if it contains a reachable View 4292 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4293 * is a View whose parents do not block descendants focus. 4294 * 4295 * Only {@link #VISIBLE} views are considered focusable. 4296 * 4297 * @return True if the view is focusable or if the view contains a focusable 4298 * View, false otherwise. 4299 * 4300 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4301 */ 4302 public boolean hasFocusable() { 4303 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4304 } 4305 4306 /** 4307 * Called by the view system when the focus state of this view changes. 4308 * When the focus change event is caused by directional navigation, direction 4309 * and previouslyFocusedRect provide insight into where the focus is coming from. 4310 * When overriding, be sure to call up through to the super class so that 4311 * the standard focus handling will occur. 4312 * 4313 * @param gainFocus True if the View has focus; false otherwise. 4314 * @param direction The direction focus has moved when requestFocus() 4315 * is called to give this view focus. Values are 4316 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4317 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4318 * It may not always apply, in which case use the default. 4319 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4320 * system, of the previously focused view. If applicable, this will be 4321 * passed in as finer grained information about where the focus is coming 4322 * from (in addition to direction). Will be <code>null</code> otherwise. 4323 */ 4324 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4325 if (gainFocus) { 4326 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4327 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4328 } 4329 } 4330 4331 InputMethodManager imm = InputMethodManager.peekInstance(); 4332 if (!gainFocus) { 4333 if (isPressed()) { 4334 setPressed(false); 4335 } 4336 if (imm != null && mAttachInfo != null 4337 && mAttachInfo.mHasWindowFocus) { 4338 imm.focusOut(this); 4339 } 4340 onFocusLost(); 4341 } else if (imm != null && mAttachInfo != null 4342 && mAttachInfo.mHasWindowFocus) { 4343 imm.focusIn(this); 4344 } 4345 4346 invalidate(true); 4347 ListenerInfo li = mListenerInfo; 4348 if (li != null && li.mOnFocusChangeListener != null) { 4349 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4350 } 4351 4352 if (mAttachInfo != null) { 4353 mAttachInfo.mKeyDispatchState.reset(this); 4354 } 4355 } 4356 4357 /** 4358 * Sends an accessibility event of the given type. If accessiiblity is 4359 * not enabled this method has no effect. The default implementation calls 4360 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4361 * to populate information about the event source (this View), then calls 4362 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4363 * populate the text content of the event source including its descendants, 4364 * and last calls 4365 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4366 * on its parent to resuest sending of the event to interested parties. 4367 * <p> 4368 * If an {@link AccessibilityDelegate} has been specified via calling 4369 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4370 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4371 * responsible for handling this call. 4372 * </p> 4373 * 4374 * @param eventType The type of the event to send, as defined by several types from 4375 * {@link android.view.accessibility.AccessibilityEvent}, such as 4376 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4377 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4378 * 4379 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4380 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4381 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4382 * @see AccessibilityDelegate 4383 */ 4384 public void sendAccessibilityEvent(int eventType) { 4385 if (mAccessibilityDelegate != null) { 4386 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4387 } else { 4388 sendAccessibilityEventInternal(eventType); 4389 } 4390 } 4391 4392 /** 4393 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4394 * {@link AccessibilityEvent} to make an announcement which is related to some 4395 * sort of a context change for which none of the events representing UI transitions 4396 * is a good fit. For example, announcing a new page in a book. If accessibility 4397 * is not enabled this method does nothing. 4398 * 4399 * @param text The announcement text. 4400 */ 4401 public void announceForAccessibility(CharSequence text) { 4402 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4403 AccessibilityEvent event = AccessibilityEvent.obtain( 4404 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4405 event.getText().add(text); 4406 sendAccessibilityEventUnchecked(event); 4407 } 4408 } 4409 4410 /** 4411 * @see #sendAccessibilityEvent(int) 4412 * 4413 * Note: Called from the default {@link AccessibilityDelegate}. 4414 */ 4415 void sendAccessibilityEventInternal(int eventType) { 4416 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4417 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4418 } 4419 } 4420 4421 /** 4422 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4423 * takes as an argument an empty {@link AccessibilityEvent} and does not 4424 * perform a check whether accessibility is enabled. 4425 * <p> 4426 * If an {@link AccessibilityDelegate} has been specified via calling 4427 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4428 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4429 * is responsible for handling this call. 4430 * </p> 4431 * 4432 * @param event The event to send. 4433 * 4434 * @see #sendAccessibilityEvent(int) 4435 */ 4436 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4437 if (mAccessibilityDelegate != null) { 4438 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4439 } else { 4440 sendAccessibilityEventUncheckedInternal(event); 4441 } 4442 } 4443 4444 /** 4445 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4446 * 4447 * Note: Called from the default {@link AccessibilityDelegate}. 4448 */ 4449 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4450 if (!isShown()) { 4451 return; 4452 } 4453 onInitializeAccessibilityEvent(event); 4454 // Only a subset of accessibility events populates text content. 4455 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4456 dispatchPopulateAccessibilityEvent(event); 4457 } 4458 // Intercept accessibility focus events fired by virtual nodes to keep 4459 // track of accessibility focus position in such nodes. 4460 final int eventType = event.getEventType(); 4461 switch (eventType) { 4462 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED: { 4463 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4464 event.getSourceNodeId()); 4465 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4466 ViewRootImpl viewRootImpl = getViewRootImpl(); 4467 if (viewRootImpl != null) { 4468 viewRootImpl.setAccessibilityFocusedHost(this); 4469 } 4470 } 4471 } break; 4472 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: { 4473 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4474 event.getSourceNodeId()); 4475 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4476 ViewRootImpl viewRootImpl = getViewRootImpl(); 4477 if (viewRootImpl != null) { 4478 viewRootImpl.setAccessibilityFocusedHost(null); 4479 } 4480 } 4481 } break; 4482 } 4483 // In the beginning we called #isShown(), so we know that getParent() is not null. 4484 getParent().requestSendAccessibilityEvent(this, event); 4485 } 4486 4487 /** 4488 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4489 * to its children for adding their text content to the event. Note that the 4490 * event text is populated in a separate dispatch path since we add to the 4491 * event not only the text of the source but also the text of all its descendants. 4492 * A typical implementation will call 4493 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4494 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4495 * on each child. Override this method if custom population of the event text 4496 * content is required. 4497 * <p> 4498 * If an {@link AccessibilityDelegate} has been specified via calling 4499 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4500 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4501 * is responsible for handling this call. 4502 * </p> 4503 * <p> 4504 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4505 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4506 * </p> 4507 * 4508 * @param event The event. 4509 * 4510 * @return True if the event population was completed. 4511 */ 4512 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4513 if (mAccessibilityDelegate != null) { 4514 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4515 } else { 4516 return dispatchPopulateAccessibilityEventInternal(event); 4517 } 4518 } 4519 4520 /** 4521 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4522 * 4523 * Note: Called from the default {@link AccessibilityDelegate}. 4524 */ 4525 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4526 onPopulateAccessibilityEvent(event); 4527 return false; 4528 } 4529 4530 /** 4531 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4532 * giving a chance to this View to populate the accessibility event with its 4533 * text content. While this method is free to modify event 4534 * attributes other than text content, doing so should normally be performed in 4535 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4536 * <p> 4537 * Example: Adding formatted date string to an accessibility event in addition 4538 * to the text added by the super implementation: 4539 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4540 * super.onPopulateAccessibilityEvent(event); 4541 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4542 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4543 * mCurrentDate.getTimeInMillis(), flags); 4544 * event.getText().add(selectedDateUtterance); 4545 * }</pre> 4546 * <p> 4547 * If an {@link AccessibilityDelegate} has been specified via calling 4548 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4549 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4550 * is responsible for handling this call. 4551 * </p> 4552 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4553 * information to the event, in case the default implementation has basic information to add. 4554 * </p> 4555 * 4556 * @param event The accessibility event which to populate. 4557 * 4558 * @see #sendAccessibilityEvent(int) 4559 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4560 */ 4561 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4562 if (mAccessibilityDelegate != null) { 4563 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4564 } else { 4565 onPopulateAccessibilityEventInternal(event); 4566 } 4567 } 4568 4569 /** 4570 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4571 * 4572 * Note: Called from the default {@link AccessibilityDelegate}. 4573 */ 4574 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4575 4576 } 4577 4578 /** 4579 * Initializes an {@link AccessibilityEvent} with information about 4580 * this View which is the event source. In other words, the source of 4581 * an accessibility event is the view whose state change triggered firing 4582 * the event. 4583 * <p> 4584 * Example: Setting the password property of an event in addition 4585 * to properties set by the super implementation: 4586 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4587 * super.onInitializeAccessibilityEvent(event); 4588 * event.setPassword(true); 4589 * }</pre> 4590 * <p> 4591 * If an {@link AccessibilityDelegate} has been specified via calling 4592 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4593 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4594 * is responsible for handling this call. 4595 * </p> 4596 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4597 * information to the event, in case the default implementation has basic information to add. 4598 * </p> 4599 * @param event The event to initialize. 4600 * 4601 * @see #sendAccessibilityEvent(int) 4602 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4603 */ 4604 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4605 if (mAccessibilityDelegate != null) { 4606 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4607 } else { 4608 onInitializeAccessibilityEventInternal(event); 4609 } 4610 } 4611 4612 /** 4613 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4614 * 4615 * Note: Called from the default {@link AccessibilityDelegate}. 4616 */ 4617 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4618 event.setSource(this); 4619 event.setClassName(View.class.getName()); 4620 event.setPackageName(getContext().getPackageName()); 4621 event.setEnabled(isEnabled()); 4622 event.setContentDescription(mContentDescription); 4623 4624 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4625 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4626 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4627 FOCUSABLES_ALL); 4628 event.setItemCount(focusablesTempList.size()); 4629 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4630 focusablesTempList.clear(); 4631 } 4632 } 4633 4634 /** 4635 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4636 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4637 * This method is responsible for obtaining an accessibility node info from a 4638 * pool of reusable instances and calling 4639 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4640 * initialize the former. 4641 * <p> 4642 * Note: The client is responsible for recycling the obtained instance by calling 4643 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4644 * </p> 4645 * 4646 * @return A populated {@link AccessibilityNodeInfo}. 4647 * 4648 * @see AccessibilityNodeInfo 4649 */ 4650 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4651 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4652 if (provider != null) { 4653 return provider.createAccessibilityNodeInfo(View.NO_ID); 4654 } else { 4655 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4656 onInitializeAccessibilityNodeInfo(info); 4657 return info; 4658 } 4659 } 4660 4661 /** 4662 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4663 * The base implementation sets: 4664 * <ul> 4665 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4666 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4667 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4668 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4669 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4670 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4671 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4672 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4673 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4674 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4675 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4676 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4677 * </ul> 4678 * <p> 4679 * Subclasses should override this method, call the super implementation, 4680 * and set additional attributes. 4681 * </p> 4682 * <p> 4683 * If an {@link AccessibilityDelegate} has been specified via calling 4684 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4685 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4686 * is responsible for handling this call. 4687 * </p> 4688 * 4689 * @param info The instance to initialize. 4690 */ 4691 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4692 if (mAccessibilityDelegate != null) { 4693 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4694 } else { 4695 onInitializeAccessibilityNodeInfoInternal(info); 4696 } 4697 } 4698 4699 /** 4700 * Gets the location of this view in screen coordintates. 4701 * 4702 * @param outRect The output location 4703 */ 4704 private void getBoundsOnScreen(Rect outRect) { 4705 if (mAttachInfo == null) { 4706 return; 4707 } 4708 4709 RectF position = mAttachInfo.mTmpTransformRect; 4710 position.set(0, 0, mRight - mLeft, mBottom - mTop); 4711 4712 if (!hasIdentityMatrix()) { 4713 getMatrix().mapRect(position); 4714 } 4715 4716 position.offset(mLeft, mTop); 4717 4718 ViewParent parent = mParent; 4719 while (parent instanceof View) { 4720 View parentView = (View) parent; 4721 4722 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4723 4724 if (!parentView.hasIdentityMatrix()) { 4725 parentView.getMatrix().mapRect(position); 4726 } 4727 4728 position.offset(parentView.mLeft, parentView.mTop); 4729 4730 parent = parentView.mParent; 4731 } 4732 4733 if (parent instanceof ViewRootImpl) { 4734 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 4735 position.offset(0, -viewRootImpl.mCurScrollY); 4736 } 4737 4738 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4739 4740 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 4741 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 4742 } 4743 4744 /** 4745 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4746 * 4747 * Note: Called from the default {@link AccessibilityDelegate}. 4748 */ 4749 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4750 Rect bounds = mAttachInfo.mTmpInvalRect; 4751 getDrawingRect(bounds); 4752 info.setBoundsInParent(bounds); 4753 4754 getBoundsOnScreen(bounds); 4755 info.setBoundsInScreen(bounds); 4756 4757 ViewParent parent = getParentForAccessibility(); 4758 if (parent instanceof View) { 4759 info.setParent((View) parent); 4760 } 4761 4762 info.setVisibleToUser(isVisibleToUser()); 4763 4764 info.setPackageName(mContext.getPackageName()); 4765 info.setClassName(View.class.getName()); 4766 info.setContentDescription(getContentDescription()); 4767 4768 info.setEnabled(isEnabled()); 4769 info.setClickable(isClickable()); 4770 info.setFocusable(isFocusable()); 4771 info.setFocused(isFocused()); 4772 info.setAccessibilityFocused(isAccessibilityFocused()); 4773 info.setSelected(isSelected()); 4774 info.setLongClickable(isLongClickable()); 4775 4776 // TODO: These make sense only if we are in an AdapterView but all 4777 // views can be selected. Maybe from accessiiblity perspective 4778 // we should report as selectable view in an AdapterView. 4779 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4780 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4781 4782 if (isFocusable()) { 4783 if (isFocused()) { 4784 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4785 } else { 4786 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4787 } 4788 } 4789 4790 if (!isAccessibilityFocused()) { 4791 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4792 } else { 4793 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4794 } 4795 4796 if (isClickable() && isEnabled()) { 4797 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4798 } 4799 4800 if (isLongClickable() && isEnabled()) { 4801 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4802 } 4803 4804 if (mContentDescription != null && mContentDescription.length() > 0) { 4805 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 4806 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 4807 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 4808 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 4809 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 4810 } 4811 } 4812 4813 /** 4814 * Computes whether this view is visible to the user. Such a view is 4815 * attached, visible, all its predecessors are visible, it is not clipped 4816 * entirely by its predecessors, and has an alpha greater than zero. 4817 * 4818 * @return Whether the view is visible on the screen. 4819 * 4820 * @hide 4821 */ 4822 protected boolean isVisibleToUser() { 4823 return isVisibleToUser(null); 4824 } 4825 4826 /** 4827 * Computes whether the given portion of this view is visible to the user. Such a view is 4828 * attached, visible, all its predecessors are visible, has an alpha greater than zero, and 4829 * the specified portion is not clipped entirely by its predecessors. 4830 * 4831 * @param boundInView the portion of the view to test; coordinates should be relative; may be 4832 * <code>null</code>, and the entire view will be tested in this case. 4833 * When <code>true</code> is returned by the function, the actual visible 4834 * region will be stored in this parameter; that is, if boundInView is fully 4835 * contained within the view, no modification will be made, otherwise regions 4836 * outside of the visible area of the view will be clipped. 4837 * 4838 * @return Whether the specified portion of the view is visible on the screen. 4839 * 4840 * @hide 4841 */ 4842 protected boolean isVisibleToUser(Rect boundInView) { 4843 Rect visibleRect = mAttachInfo.mTmpInvalRect; 4844 Point offset = mAttachInfo.mPoint; 4845 // The first two checks are made also made by isShown() which 4846 // however traverses the tree up to the parent to catch that. 4847 // Therefore, we do some fail fast check to minimize the up 4848 // tree traversal. 4849 boolean isVisible = mAttachInfo != null 4850 && mAttachInfo.mWindowVisibility == View.VISIBLE 4851 && getAlpha() > 0 4852 && isShown() 4853 && getGlobalVisibleRect(visibleRect, offset); 4854 if (isVisible && boundInView != null) { 4855 visibleRect.offset(-offset.x, -offset.y); 4856 isVisible &= boundInView.intersect(visibleRect); 4857 } 4858 return isVisible; 4859 } 4860 4861 /** 4862 * Sets a delegate for implementing accessibility support via compositon as 4863 * opposed to inheritance. The delegate's primary use is for implementing 4864 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4865 * 4866 * @param delegate The delegate instance. 4867 * 4868 * @see AccessibilityDelegate 4869 */ 4870 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4871 mAccessibilityDelegate = delegate; 4872 } 4873 4874 /** 4875 * Gets the provider for managing a virtual view hierarchy rooted at this View 4876 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4877 * that explore the window content. 4878 * <p> 4879 * If this method returns an instance, this instance is responsible for managing 4880 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4881 * View including the one representing the View itself. Similarly the returned 4882 * instance is responsible for performing accessibility actions on any virtual 4883 * view or the root view itself. 4884 * </p> 4885 * <p> 4886 * If an {@link AccessibilityDelegate} has been specified via calling 4887 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4888 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4889 * is responsible for handling this call. 4890 * </p> 4891 * 4892 * @return The provider. 4893 * 4894 * @see AccessibilityNodeProvider 4895 */ 4896 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4897 if (mAccessibilityDelegate != null) { 4898 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4899 } else { 4900 return null; 4901 } 4902 } 4903 4904 /** 4905 * Gets the unique identifier of this view on the screen for accessibility purposes. 4906 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4907 * 4908 * @return The view accessibility id. 4909 * 4910 * @hide 4911 */ 4912 public int getAccessibilityViewId() { 4913 if (mAccessibilityViewId == NO_ID) { 4914 mAccessibilityViewId = sNextAccessibilityViewId++; 4915 } 4916 return mAccessibilityViewId; 4917 } 4918 4919 /** 4920 * Gets the unique identifier of the window in which this View reseides. 4921 * 4922 * @return The window accessibility id. 4923 * 4924 * @hide 4925 */ 4926 public int getAccessibilityWindowId() { 4927 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4928 } 4929 4930 /** 4931 * Gets the {@link View} description. It briefly describes the view and is 4932 * primarily used for accessibility support. Set this property to enable 4933 * better accessibility support for your application. This is especially 4934 * true for views that do not have textual representation (For example, 4935 * ImageButton). 4936 * 4937 * @return The content description. 4938 * 4939 * @attr ref android.R.styleable#View_contentDescription 4940 */ 4941 @ViewDebug.ExportedProperty(category = "accessibility") 4942 public CharSequence getContentDescription() { 4943 return mContentDescription; 4944 } 4945 4946 /** 4947 * Sets the {@link View} description. It briefly describes the view and is 4948 * primarily used for accessibility support. Set this property to enable 4949 * better accessibility support for your application. This is especially 4950 * true for views that do not have textual representation (For example, 4951 * ImageButton). 4952 * 4953 * @param contentDescription The content description. 4954 * 4955 * @attr ref android.R.styleable#View_contentDescription 4956 */ 4957 @RemotableViewMethod 4958 public void setContentDescription(CharSequence contentDescription) { 4959 mContentDescription = contentDescription; 4960 } 4961 4962 /** 4963 * Invoked whenever this view loses focus, either by losing window focus or by losing 4964 * focus within its window. This method can be used to clear any state tied to the 4965 * focus. For instance, if a button is held pressed with the trackball and the window 4966 * loses focus, this method can be used to cancel the press. 4967 * 4968 * Subclasses of View overriding this method should always call super.onFocusLost(). 4969 * 4970 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4971 * @see #onWindowFocusChanged(boolean) 4972 * 4973 * @hide pending API council approval 4974 */ 4975 protected void onFocusLost() { 4976 resetPressedState(); 4977 } 4978 4979 private void resetPressedState() { 4980 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4981 return; 4982 } 4983 4984 if (isPressed()) { 4985 setPressed(false); 4986 4987 if (!mHasPerformedLongPress) { 4988 removeLongPressCallback(); 4989 } 4990 } 4991 } 4992 4993 /** 4994 * Returns true if this view has focus 4995 * 4996 * @return True if this view has focus, false otherwise. 4997 */ 4998 @ViewDebug.ExportedProperty(category = "focus") 4999 public boolean isFocused() { 5000 return (mPrivateFlags & FOCUSED) != 0; 5001 } 5002 5003 /** 5004 * Find the view in the hierarchy rooted at this view that currently has 5005 * focus. 5006 * 5007 * @return The view that currently has focus, or null if no focused view can 5008 * be found. 5009 */ 5010 public View findFocus() { 5011 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 5012 } 5013 5014 /** 5015 * Indicates whether this view is one of the set of scrollable containers in 5016 * its window. 5017 * 5018 * @return whether this view is one of the set of scrollable containers in 5019 * its window 5020 * 5021 * @attr ref android.R.styleable#View_isScrollContainer 5022 */ 5023 public boolean isScrollContainer() { 5024 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 5025 } 5026 5027 /** 5028 * Change whether this view is one of the set of scrollable containers in 5029 * its window. This will be used to determine whether the window can 5030 * resize or must pan when a soft input area is open -- scrollable 5031 * containers allow the window to use resize mode since the container 5032 * will appropriately shrink. 5033 * 5034 * @attr ref android.R.styleable#View_isScrollContainer 5035 */ 5036 public void setScrollContainer(boolean isScrollContainer) { 5037 if (isScrollContainer) { 5038 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 5039 mAttachInfo.mScrollContainers.add(this); 5040 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 5041 } 5042 mPrivateFlags |= SCROLL_CONTAINER; 5043 } else { 5044 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 5045 mAttachInfo.mScrollContainers.remove(this); 5046 } 5047 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 5048 } 5049 } 5050 5051 /** 5052 * Returns the quality of the drawing cache. 5053 * 5054 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5055 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5056 * 5057 * @see #setDrawingCacheQuality(int) 5058 * @see #setDrawingCacheEnabled(boolean) 5059 * @see #isDrawingCacheEnabled() 5060 * 5061 * @attr ref android.R.styleable#View_drawingCacheQuality 5062 */ 5063 public int getDrawingCacheQuality() { 5064 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5065 } 5066 5067 /** 5068 * Set the drawing cache quality of this view. This value is used only when the 5069 * drawing cache is enabled 5070 * 5071 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5072 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5073 * 5074 * @see #getDrawingCacheQuality() 5075 * @see #setDrawingCacheEnabled(boolean) 5076 * @see #isDrawingCacheEnabled() 5077 * 5078 * @attr ref android.R.styleable#View_drawingCacheQuality 5079 */ 5080 public void setDrawingCacheQuality(int quality) { 5081 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5082 } 5083 5084 /** 5085 * Returns whether the screen should remain on, corresponding to the current 5086 * value of {@link #KEEP_SCREEN_ON}. 5087 * 5088 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5089 * 5090 * @see #setKeepScreenOn(boolean) 5091 * 5092 * @attr ref android.R.styleable#View_keepScreenOn 5093 */ 5094 public boolean getKeepScreenOn() { 5095 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5096 } 5097 5098 /** 5099 * Controls whether the screen should remain on, modifying the 5100 * value of {@link #KEEP_SCREEN_ON}. 5101 * 5102 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5103 * 5104 * @see #getKeepScreenOn() 5105 * 5106 * @attr ref android.R.styleable#View_keepScreenOn 5107 */ 5108 public void setKeepScreenOn(boolean keepScreenOn) { 5109 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5110 } 5111 5112 /** 5113 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5114 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5115 * 5116 * @attr ref android.R.styleable#View_nextFocusLeft 5117 */ 5118 public int getNextFocusLeftId() { 5119 return mNextFocusLeftId; 5120 } 5121 5122 /** 5123 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5124 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5125 * decide automatically. 5126 * 5127 * @attr ref android.R.styleable#View_nextFocusLeft 5128 */ 5129 public void setNextFocusLeftId(int nextFocusLeftId) { 5130 mNextFocusLeftId = nextFocusLeftId; 5131 } 5132 5133 /** 5134 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5135 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5136 * 5137 * @attr ref android.R.styleable#View_nextFocusRight 5138 */ 5139 public int getNextFocusRightId() { 5140 return mNextFocusRightId; 5141 } 5142 5143 /** 5144 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5145 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5146 * decide automatically. 5147 * 5148 * @attr ref android.R.styleable#View_nextFocusRight 5149 */ 5150 public void setNextFocusRightId(int nextFocusRightId) { 5151 mNextFocusRightId = nextFocusRightId; 5152 } 5153 5154 /** 5155 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5156 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5157 * 5158 * @attr ref android.R.styleable#View_nextFocusUp 5159 */ 5160 public int getNextFocusUpId() { 5161 return mNextFocusUpId; 5162 } 5163 5164 /** 5165 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5166 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5167 * decide automatically. 5168 * 5169 * @attr ref android.R.styleable#View_nextFocusUp 5170 */ 5171 public void setNextFocusUpId(int nextFocusUpId) { 5172 mNextFocusUpId = nextFocusUpId; 5173 } 5174 5175 /** 5176 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5177 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5178 * 5179 * @attr ref android.R.styleable#View_nextFocusDown 5180 */ 5181 public int getNextFocusDownId() { 5182 return mNextFocusDownId; 5183 } 5184 5185 /** 5186 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5187 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5188 * decide automatically. 5189 * 5190 * @attr ref android.R.styleable#View_nextFocusDown 5191 */ 5192 public void setNextFocusDownId(int nextFocusDownId) { 5193 mNextFocusDownId = nextFocusDownId; 5194 } 5195 5196 /** 5197 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5198 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5199 * 5200 * @attr ref android.R.styleable#View_nextFocusForward 5201 */ 5202 public int getNextFocusForwardId() { 5203 return mNextFocusForwardId; 5204 } 5205 5206 /** 5207 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5208 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5209 * decide automatically. 5210 * 5211 * @attr ref android.R.styleable#View_nextFocusForward 5212 */ 5213 public void setNextFocusForwardId(int nextFocusForwardId) { 5214 mNextFocusForwardId = nextFocusForwardId; 5215 } 5216 5217 /** 5218 * Returns the visibility of this view and all of its ancestors 5219 * 5220 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5221 */ 5222 public boolean isShown() { 5223 View current = this; 5224 //noinspection ConstantConditions 5225 do { 5226 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5227 return false; 5228 } 5229 ViewParent parent = current.mParent; 5230 if (parent == null) { 5231 return false; // We are not attached to the view root 5232 } 5233 if (!(parent instanceof View)) { 5234 return true; 5235 } 5236 current = (View) parent; 5237 } while (current != null); 5238 5239 return false; 5240 } 5241 5242 /** 5243 * Called by the view hierarchy when the content insets for a window have 5244 * changed, to allow it to adjust its content to fit within those windows. 5245 * The content insets tell you the space that the status bar, input method, 5246 * and other system windows infringe on the application's window. 5247 * 5248 * <p>You do not normally need to deal with this function, since the default 5249 * window decoration given to applications takes care of applying it to the 5250 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5251 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5252 * and your content can be placed under those system elements. You can then 5253 * use this method within your view hierarchy if you have parts of your UI 5254 * which you would like to ensure are not being covered. 5255 * 5256 * <p>The default implementation of this method simply applies the content 5257 * inset's to the view's padding, consuming that content (modifying the 5258 * insets to be 0), and returning true. This behavior is off by default, but can 5259 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5260 * 5261 * <p>This function's traversal down the hierarchy is depth-first. The same content 5262 * insets object is propagated down the hierarchy, so any changes made to it will 5263 * be seen by all following views (including potentially ones above in 5264 * the hierarchy since this is a depth-first traversal). The first view 5265 * that returns true will abort the entire traversal. 5266 * 5267 * <p>The default implementation works well for a situation where it is 5268 * used with a container that covers the entire window, allowing it to 5269 * apply the appropriate insets to its content on all edges. If you need 5270 * a more complicated layout (such as two different views fitting system 5271 * windows, one on the top of the window, and one on the bottom), 5272 * you can override the method and handle the insets however you would like. 5273 * Note that the insets provided by the framework are always relative to the 5274 * far edges of the window, not accounting for the location of the called view 5275 * within that window. (In fact when this method is called you do not yet know 5276 * where the layout will place the view, as it is done before layout happens.) 5277 * 5278 * <p>Note: unlike many View methods, there is no dispatch phase to this 5279 * call. If you are overriding it in a ViewGroup and want to allow the 5280 * call to continue to your children, you must be sure to call the super 5281 * implementation. 5282 * 5283 * <p>Here is a sample layout that makes use of fitting system windows 5284 * to have controls for a video view placed inside of the window decorations 5285 * that it hides and shows. This can be used with code like the second 5286 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5287 * 5288 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5289 * 5290 * @param insets Current content insets of the window. Prior to 5291 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5292 * the insets or else you and Android will be unhappy. 5293 * 5294 * @return Return true if this view applied the insets and it should not 5295 * continue propagating further down the hierarchy, false otherwise. 5296 * @see #getFitsSystemWindows() 5297 * @see #setFitsSystemWindows() 5298 * @see #setSystemUiVisibility(int) 5299 */ 5300 protected boolean fitSystemWindows(Rect insets) { 5301 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5302 mUserPaddingStart = -1; 5303 mUserPaddingEnd = -1; 5304 mUserPaddingRelative = false; 5305 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5306 || mAttachInfo == null 5307 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5308 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5309 return true; 5310 } else { 5311 internalSetPadding(0, 0, 0, 0); 5312 return false; 5313 } 5314 } 5315 return false; 5316 } 5317 5318 /** 5319 * Sets whether or not this view should account for system screen decorations 5320 * such as the status bar and inset its content; that is, controlling whether 5321 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5322 * executed. See that method for more details. 5323 * 5324 * <p>Note that if you are providing your own implementation of 5325 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5326 * flag to true -- your implementation will be overriding the default 5327 * implementation that checks this flag. 5328 * 5329 * @param fitSystemWindows If true, then the default implementation of 5330 * {@link #fitSystemWindows(Rect)} will be executed. 5331 * 5332 * @attr ref android.R.styleable#View_fitsSystemWindows 5333 * @see #getFitsSystemWindows() 5334 * @see #fitSystemWindows(Rect) 5335 * @see #setSystemUiVisibility(int) 5336 */ 5337 public void setFitsSystemWindows(boolean fitSystemWindows) { 5338 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5339 } 5340 5341 /** 5342 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5343 * returns true, the default implementation of {@link #fitSystemWindows(Rect)} 5344 * will be executed. 5345 * 5346 * @return Returns true if the default implementation of 5347 * {@link #fitSystemWindows(Rect)} will be executed. 5348 * 5349 * @attr ref android.R.styleable#View_fitsSystemWindows 5350 * @see #setFitsSystemWindows() 5351 * @see #fitSystemWindows(Rect) 5352 * @see #setSystemUiVisibility(int) 5353 */ 5354 public boolean getFitsSystemWindows() { 5355 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5356 } 5357 5358 /** @hide */ 5359 public boolean fitsSystemWindows() { 5360 return getFitsSystemWindows(); 5361 } 5362 5363 /** 5364 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5365 */ 5366 public void requestFitSystemWindows() { 5367 if (mParent != null) { 5368 mParent.requestFitSystemWindows(); 5369 } 5370 } 5371 5372 /** 5373 * For use by PhoneWindow to make its own system window fitting optional. 5374 * @hide 5375 */ 5376 public void makeOptionalFitsSystemWindows() { 5377 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5378 } 5379 5380 /** 5381 * Returns the visibility status for this view. 5382 * 5383 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5384 * @attr ref android.R.styleable#View_visibility 5385 */ 5386 @ViewDebug.ExportedProperty(mapping = { 5387 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5388 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5389 @ViewDebug.IntToString(from = GONE, to = "GONE") 5390 }) 5391 public int getVisibility() { 5392 return mViewFlags & VISIBILITY_MASK; 5393 } 5394 5395 /** 5396 * Set the enabled state of this view. 5397 * 5398 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5399 * @attr ref android.R.styleable#View_visibility 5400 */ 5401 @RemotableViewMethod 5402 public void setVisibility(int visibility) { 5403 setFlags(visibility, VISIBILITY_MASK); 5404 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5405 } 5406 5407 /** 5408 * Returns the enabled status for this view. The interpretation of the 5409 * enabled state varies by subclass. 5410 * 5411 * @return True if this view is enabled, false otherwise. 5412 */ 5413 @ViewDebug.ExportedProperty 5414 public boolean isEnabled() { 5415 return (mViewFlags & ENABLED_MASK) == ENABLED; 5416 } 5417 5418 /** 5419 * Set the enabled state of this view. The interpretation of the enabled 5420 * state varies by subclass. 5421 * 5422 * @param enabled True if this view is enabled, false otherwise. 5423 */ 5424 @RemotableViewMethod 5425 public void setEnabled(boolean enabled) { 5426 if (enabled == isEnabled()) return; 5427 5428 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5429 5430 /* 5431 * The View most likely has to change its appearance, so refresh 5432 * the drawable state. 5433 */ 5434 refreshDrawableState(); 5435 5436 // Invalidate too, since the default behavior for views is to be 5437 // be drawn at 50% alpha rather than to change the drawable. 5438 invalidate(true); 5439 } 5440 5441 /** 5442 * Set whether this view can receive the focus. 5443 * 5444 * Setting this to false will also ensure that this view is not focusable 5445 * in touch mode. 5446 * 5447 * @param focusable If true, this view can receive the focus. 5448 * 5449 * @see #setFocusableInTouchMode(boolean) 5450 * @attr ref android.R.styleable#View_focusable 5451 */ 5452 public void setFocusable(boolean focusable) { 5453 if (!focusable) { 5454 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5455 } 5456 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5457 } 5458 5459 /** 5460 * Set whether this view can receive focus while in touch mode. 5461 * 5462 * Setting this to true will also ensure that this view is focusable. 5463 * 5464 * @param focusableInTouchMode If true, this view can receive the focus while 5465 * in touch mode. 5466 * 5467 * @see #setFocusable(boolean) 5468 * @attr ref android.R.styleable#View_focusableInTouchMode 5469 */ 5470 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5471 // Focusable in touch mode should always be set before the focusable flag 5472 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5473 // which, in touch mode, will not successfully request focus on this view 5474 // because the focusable in touch mode flag is not set 5475 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5476 if (focusableInTouchMode) { 5477 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5478 } 5479 } 5480 5481 /** 5482 * Set whether this view should have sound effects enabled for events such as 5483 * clicking and touching. 5484 * 5485 * <p>You may wish to disable sound effects for a view if you already play sounds, 5486 * for instance, a dial key that plays dtmf tones. 5487 * 5488 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5489 * @see #isSoundEffectsEnabled() 5490 * @see #playSoundEffect(int) 5491 * @attr ref android.R.styleable#View_soundEffectsEnabled 5492 */ 5493 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5494 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5495 } 5496 5497 /** 5498 * @return whether this view should have sound effects enabled for events such as 5499 * clicking and touching. 5500 * 5501 * @see #setSoundEffectsEnabled(boolean) 5502 * @see #playSoundEffect(int) 5503 * @attr ref android.R.styleable#View_soundEffectsEnabled 5504 */ 5505 @ViewDebug.ExportedProperty 5506 public boolean isSoundEffectsEnabled() { 5507 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5508 } 5509 5510 /** 5511 * Set whether this view should have haptic feedback for events such as 5512 * long presses. 5513 * 5514 * <p>You may wish to disable haptic feedback if your view already controls 5515 * its own haptic feedback. 5516 * 5517 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5518 * @see #isHapticFeedbackEnabled() 5519 * @see #performHapticFeedback(int) 5520 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5521 */ 5522 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5523 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5524 } 5525 5526 /** 5527 * @return whether this view should have haptic feedback enabled for events 5528 * long presses. 5529 * 5530 * @see #setHapticFeedbackEnabled(boolean) 5531 * @see #performHapticFeedback(int) 5532 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5533 */ 5534 @ViewDebug.ExportedProperty 5535 public boolean isHapticFeedbackEnabled() { 5536 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5537 } 5538 5539 /** 5540 * Returns the layout direction for this view. 5541 * 5542 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5543 * {@link #LAYOUT_DIRECTION_RTL}, 5544 * {@link #LAYOUT_DIRECTION_INHERIT} or 5545 * {@link #LAYOUT_DIRECTION_LOCALE}. 5546 * 5547 * @attr ref android.R.styleable#View_layoutDirection 5548 * @hide 5549 */ 5550 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5551 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5552 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5553 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5554 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5555 }) 5556 public int getLayoutDirection() { 5557 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5558 } 5559 5560 /** 5561 * Set the layout direction for this view. This will propagate a reset of layout direction 5562 * resolution to the view's children and resolve layout direction for this view. 5563 * 5564 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5565 * {@link #LAYOUT_DIRECTION_RTL}, 5566 * {@link #LAYOUT_DIRECTION_INHERIT} or 5567 * {@link #LAYOUT_DIRECTION_LOCALE}. 5568 * 5569 * @attr ref android.R.styleable#View_layoutDirection 5570 * @hide 5571 */ 5572 @RemotableViewMethod 5573 public void setLayoutDirection(int layoutDirection) { 5574 if (getLayoutDirection() != layoutDirection) { 5575 // Reset the current layout direction and the resolved one 5576 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5577 resetResolvedLayoutDirection(); 5578 // Set the new layout direction (filtered) and ask for a layout pass 5579 mPrivateFlags2 |= 5580 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5581 requestLayout(); 5582 } 5583 } 5584 5585 /** 5586 * Returns the resolved layout direction for this view. 5587 * 5588 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5589 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5590 * @hide 5591 */ 5592 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5593 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5594 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5595 }) 5596 public int getResolvedLayoutDirection() { 5597 // The layout diretion will be resolved only if needed 5598 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5599 resolveLayoutDirection(); 5600 } 5601 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5602 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5603 } 5604 5605 /** 5606 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5607 * layout attribute and/or the inherited value from the parent 5608 * 5609 * @return true if the layout is right-to-left. 5610 * @hide 5611 */ 5612 @ViewDebug.ExportedProperty(category = "layout") 5613 public boolean isLayoutRtl() { 5614 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5615 } 5616 5617 /** 5618 * Indicates whether the view is currently tracking transient state that the 5619 * app should not need to concern itself with saving and restoring, but that 5620 * the framework should take special note to preserve when possible. 5621 * 5622 * <p>A view with transient state cannot be trivially rebound from an external 5623 * data source, such as an adapter binding item views in a list. This may be 5624 * because the view is performing an animation, tracking user selection 5625 * of content, or similar.</p> 5626 * 5627 * @return true if the view has transient state 5628 */ 5629 @ViewDebug.ExportedProperty(category = "layout") 5630 public boolean hasTransientState() { 5631 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5632 } 5633 5634 /** 5635 * Set whether this view is currently tracking transient state that the 5636 * framework should attempt to preserve when possible. This flag is reference counted, 5637 * so every call to setHasTransientState(true) should be paired with a later call 5638 * to setHasTransientState(false). 5639 * 5640 * <p>A view with transient state cannot be trivially rebound from an external 5641 * data source, such as an adapter binding item views in a list. This may be 5642 * because the view is performing an animation, tracking user selection 5643 * of content, or similar.</p> 5644 * 5645 * @param hasTransientState true if this view has transient state 5646 */ 5647 public void setHasTransientState(boolean hasTransientState) { 5648 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5649 mTransientStateCount - 1; 5650 if (mTransientStateCount < 0) { 5651 mTransientStateCount = 0; 5652 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5653 "unmatched pair of setHasTransientState calls"); 5654 } 5655 if ((hasTransientState && mTransientStateCount == 1) || 5656 (!hasTransientState && mTransientStateCount == 0)) { 5657 // update flag if we've just incremented up from 0 or decremented down to 0 5658 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5659 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5660 if (mParent != null) { 5661 try { 5662 mParent.childHasTransientStateChanged(this, hasTransientState); 5663 } catch (AbstractMethodError e) { 5664 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5665 " does not fully implement ViewParent", e); 5666 } 5667 } 5668 } 5669 } 5670 5671 /** 5672 * If this view doesn't do any drawing on its own, set this flag to 5673 * allow further optimizations. By default, this flag is not set on 5674 * View, but could be set on some View subclasses such as ViewGroup. 5675 * 5676 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5677 * you should clear this flag. 5678 * 5679 * @param willNotDraw whether or not this View draw on its own 5680 */ 5681 public void setWillNotDraw(boolean willNotDraw) { 5682 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5683 } 5684 5685 /** 5686 * Returns whether or not this View draws on its own. 5687 * 5688 * @return true if this view has nothing to draw, false otherwise 5689 */ 5690 @ViewDebug.ExportedProperty(category = "drawing") 5691 public boolean willNotDraw() { 5692 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5693 } 5694 5695 /** 5696 * When a View's drawing cache is enabled, drawing is redirected to an 5697 * offscreen bitmap. Some views, like an ImageView, must be able to 5698 * bypass this mechanism if they already draw a single bitmap, to avoid 5699 * unnecessary usage of the memory. 5700 * 5701 * @param willNotCacheDrawing true if this view does not cache its 5702 * drawing, false otherwise 5703 */ 5704 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5705 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5706 } 5707 5708 /** 5709 * Returns whether or not this View can cache its drawing or not. 5710 * 5711 * @return true if this view does not cache its drawing, false otherwise 5712 */ 5713 @ViewDebug.ExportedProperty(category = "drawing") 5714 public boolean willNotCacheDrawing() { 5715 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5716 } 5717 5718 /** 5719 * Indicates whether this view reacts to click events or not. 5720 * 5721 * @return true if the view is clickable, false otherwise 5722 * 5723 * @see #setClickable(boolean) 5724 * @attr ref android.R.styleable#View_clickable 5725 */ 5726 @ViewDebug.ExportedProperty 5727 public boolean isClickable() { 5728 return (mViewFlags & CLICKABLE) == CLICKABLE; 5729 } 5730 5731 /** 5732 * Enables or disables click events for this view. When a view 5733 * is clickable it will change its state to "pressed" on every click. 5734 * Subclasses should set the view clickable to visually react to 5735 * user's clicks. 5736 * 5737 * @param clickable true to make the view clickable, false otherwise 5738 * 5739 * @see #isClickable() 5740 * @attr ref android.R.styleable#View_clickable 5741 */ 5742 public void setClickable(boolean clickable) { 5743 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5744 } 5745 5746 /** 5747 * Indicates whether this view reacts to long click events or not. 5748 * 5749 * @return true if the view is long clickable, false otherwise 5750 * 5751 * @see #setLongClickable(boolean) 5752 * @attr ref android.R.styleable#View_longClickable 5753 */ 5754 public boolean isLongClickable() { 5755 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5756 } 5757 5758 /** 5759 * Enables or disables long click events for this view. When a view is long 5760 * clickable it reacts to the user holding down the button for a longer 5761 * duration than a tap. This event can either launch the listener or a 5762 * context menu. 5763 * 5764 * @param longClickable true to make the view long clickable, false otherwise 5765 * @see #isLongClickable() 5766 * @attr ref android.R.styleable#View_longClickable 5767 */ 5768 public void setLongClickable(boolean longClickable) { 5769 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5770 } 5771 5772 /** 5773 * Sets the pressed state for this view. 5774 * 5775 * @see #isClickable() 5776 * @see #setClickable(boolean) 5777 * 5778 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5779 * the View's internal state from a previously set "pressed" state. 5780 */ 5781 public void setPressed(boolean pressed) { 5782 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5783 5784 if (pressed) { 5785 mPrivateFlags |= PRESSED; 5786 } else { 5787 mPrivateFlags &= ~PRESSED; 5788 } 5789 5790 if (needsRefresh) { 5791 refreshDrawableState(); 5792 } 5793 dispatchSetPressed(pressed); 5794 } 5795 5796 /** 5797 * Dispatch setPressed to all of this View's children. 5798 * 5799 * @see #setPressed(boolean) 5800 * 5801 * @param pressed The new pressed state 5802 */ 5803 protected void dispatchSetPressed(boolean pressed) { 5804 } 5805 5806 /** 5807 * Indicates whether the view is currently in pressed state. Unless 5808 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5809 * the pressed state. 5810 * 5811 * @see #setPressed(boolean) 5812 * @see #isClickable() 5813 * @see #setClickable(boolean) 5814 * 5815 * @return true if the view is currently pressed, false otherwise 5816 */ 5817 public boolean isPressed() { 5818 return (mPrivateFlags & PRESSED) == PRESSED; 5819 } 5820 5821 /** 5822 * Indicates whether this view will save its state (that is, 5823 * whether its {@link #onSaveInstanceState} method will be called). 5824 * 5825 * @return Returns true if the view state saving is enabled, else false. 5826 * 5827 * @see #setSaveEnabled(boolean) 5828 * @attr ref android.R.styleable#View_saveEnabled 5829 */ 5830 public boolean isSaveEnabled() { 5831 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5832 } 5833 5834 /** 5835 * Controls whether the saving of this view's state is 5836 * enabled (that is, whether its {@link #onSaveInstanceState} method 5837 * will be called). Note that even if freezing is enabled, the 5838 * view still must have an id assigned to it (via {@link #setId(int)}) 5839 * for its state to be saved. This flag can only disable the 5840 * saving of this view; any child views may still have their state saved. 5841 * 5842 * @param enabled Set to false to <em>disable</em> state saving, or true 5843 * (the default) to allow it. 5844 * 5845 * @see #isSaveEnabled() 5846 * @see #setId(int) 5847 * @see #onSaveInstanceState() 5848 * @attr ref android.R.styleable#View_saveEnabled 5849 */ 5850 public void setSaveEnabled(boolean enabled) { 5851 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5852 } 5853 5854 /** 5855 * Gets whether the framework should discard touches when the view's 5856 * window is obscured by another visible window. 5857 * Refer to the {@link View} security documentation for more details. 5858 * 5859 * @return True if touch filtering is enabled. 5860 * 5861 * @see #setFilterTouchesWhenObscured(boolean) 5862 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5863 */ 5864 @ViewDebug.ExportedProperty 5865 public boolean getFilterTouchesWhenObscured() { 5866 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5867 } 5868 5869 /** 5870 * Sets whether the framework should discard touches when the view's 5871 * window is obscured by another visible window. 5872 * Refer to the {@link View} security documentation for more details. 5873 * 5874 * @param enabled True if touch filtering should be enabled. 5875 * 5876 * @see #getFilterTouchesWhenObscured 5877 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5878 */ 5879 public void setFilterTouchesWhenObscured(boolean enabled) { 5880 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5881 FILTER_TOUCHES_WHEN_OBSCURED); 5882 } 5883 5884 /** 5885 * Indicates whether the entire hierarchy under this view will save its 5886 * state when a state saving traversal occurs from its parent. The default 5887 * is true; if false, these views will not be saved unless 5888 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5889 * 5890 * @return Returns true if the view state saving from parent is enabled, else false. 5891 * 5892 * @see #setSaveFromParentEnabled(boolean) 5893 */ 5894 public boolean isSaveFromParentEnabled() { 5895 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5896 } 5897 5898 /** 5899 * Controls whether the entire hierarchy under this view will save its 5900 * state when a state saving traversal occurs from its parent. The default 5901 * is true; if false, these views will not be saved unless 5902 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5903 * 5904 * @param enabled Set to false to <em>disable</em> state saving, or true 5905 * (the default) to allow it. 5906 * 5907 * @see #isSaveFromParentEnabled() 5908 * @see #setId(int) 5909 * @see #onSaveInstanceState() 5910 */ 5911 public void setSaveFromParentEnabled(boolean enabled) { 5912 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5913 } 5914 5915 5916 /** 5917 * Returns whether this View is able to take focus. 5918 * 5919 * @return True if this view can take focus, or false otherwise. 5920 * @attr ref android.R.styleable#View_focusable 5921 */ 5922 @ViewDebug.ExportedProperty(category = "focus") 5923 public final boolean isFocusable() { 5924 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5925 } 5926 5927 /** 5928 * When a view is focusable, it may not want to take focus when in touch mode. 5929 * For example, a button would like focus when the user is navigating via a D-pad 5930 * so that the user can click on it, but once the user starts touching the screen, 5931 * the button shouldn't take focus 5932 * @return Whether the view is focusable in touch mode. 5933 * @attr ref android.R.styleable#View_focusableInTouchMode 5934 */ 5935 @ViewDebug.ExportedProperty 5936 public final boolean isFocusableInTouchMode() { 5937 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5938 } 5939 5940 /** 5941 * Find the nearest view in the specified direction that can take focus. 5942 * This does not actually give focus to that view. 5943 * 5944 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5945 * 5946 * @return The nearest focusable in the specified direction, or null if none 5947 * can be found. 5948 */ 5949 public View focusSearch(int direction) { 5950 if (mParent != null) { 5951 return mParent.focusSearch(this, direction); 5952 } else { 5953 return null; 5954 } 5955 } 5956 5957 /** 5958 * This method is the last chance for the focused view and its ancestors to 5959 * respond to an arrow key. This is called when the focused view did not 5960 * consume the key internally, nor could the view system find a new view in 5961 * the requested direction to give focus to. 5962 * 5963 * @param focused The currently focused view. 5964 * @param direction The direction focus wants to move. One of FOCUS_UP, 5965 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5966 * @return True if the this view consumed this unhandled move. 5967 */ 5968 public boolean dispatchUnhandledMove(View focused, int direction) { 5969 return false; 5970 } 5971 5972 /** 5973 * If a user manually specified the next view id for a particular direction, 5974 * use the root to look up the view. 5975 * @param root The root view of the hierarchy containing this view. 5976 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5977 * or FOCUS_BACKWARD. 5978 * @return The user specified next view, or null if there is none. 5979 */ 5980 View findUserSetNextFocus(View root, int direction) { 5981 switch (direction) { 5982 case FOCUS_LEFT: 5983 if (mNextFocusLeftId == View.NO_ID) return null; 5984 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5985 case FOCUS_RIGHT: 5986 if (mNextFocusRightId == View.NO_ID) return null; 5987 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5988 case FOCUS_UP: 5989 if (mNextFocusUpId == View.NO_ID) return null; 5990 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5991 case FOCUS_DOWN: 5992 if (mNextFocusDownId == View.NO_ID) return null; 5993 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5994 case FOCUS_FORWARD: 5995 if (mNextFocusForwardId == View.NO_ID) return null; 5996 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5997 case FOCUS_BACKWARD: { 5998 if (mID == View.NO_ID) return null; 5999 final int id = mID; 6000 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 6001 @Override 6002 public boolean apply(View t) { 6003 return t.mNextFocusForwardId == id; 6004 } 6005 }); 6006 } 6007 } 6008 return null; 6009 } 6010 6011 private View findViewInsideOutShouldExist(View root, final int childViewId) { 6012 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 6013 @Override 6014 public boolean apply(View t) { 6015 return t.mID == childViewId; 6016 } 6017 }); 6018 6019 if (result == null) { 6020 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 6021 + "by user for id " + childViewId); 6022 } 6023 return result; 6024 } 6025 6026 /** 6027 * Find and return all focusable views that are descendants of this view, 6028 * possibly including this view if it is focusable itself. 6029 * 6030 * @param direction The direction of the focus 6031 * @return A list of focusable views 6032 */ 6033 public ArrayList<View> getFocusables(int direction) { 6034 ArrayList<View> result = new ArrayList<View>(24); 6035 addFocusables(result, direction); 6036 return result; 6037 } 6038 6039 /** 6040 * Add any focusable views that are descendants of this view (possibly 6041 * including this view if it is focusable itself) to views. If we are in touch mode, 6042 * only add views that are also focusable in touch mode. 6043 * 6044 * @param views Focusable views found so far 6045 * @param direction The direction of the focus 6046 */ 6047 public void addFocusables(ArrayList<View> views, int direction) { 6048 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6049 } 6050 6051 /** 6052 * Adds any focusable views that are descendants of this view (possibly 6053 * including this view if it is focusable itself) to views. This method 6054 * adds all focusable views regardless if we are in touch mode or 6055 * only views focusable in touch mode if we are in touch mode or 6056 * only views that can take accessibility focus if accessibility is enabeld 6057 * depending on the focusable mode paramater. 6058 * 6059 * @param views Focusable views found so far or null if all we are interested is 6060 * the number of focusables. 6061 * @param direction The direction of the focus. 6062 * @param focusableMode The type of focusables to be added. 6063 * 6064 * @see #FOCUSABLES_ALL 6065 * @see #FOCUSABLES_TOUCH_MODE 6066 */ 6067 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6068 if (views == null) { 6069 return; 6070 } 6071 if ((focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 6072 if (canTakeAccessibilityFocusFromHover() || getAccessibilityNodeProvider() != null) { 6073 views.add(this); 6074 return; 6075 } 6076 } 6077 if (!isFocusable()) { 6078 return; 6079 } 6080 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6081 && isInTouchMode() && !isFocusableInTouchMode()) { 6082 return; 6083 } 6084 views.add(this); 6085 } 6086 6087 /** 6088 * Finds the Views that contain given text. The containment is case insensitive. 6089 * The search is performed by either the text that the View renders or the content 6090 * description that describes the view for accessibility purposes and the view does 6091 * not render or both. Clients can specify how the search is to be performed via 6092 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6093 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6094 * 6095 * @param outViews The output list of matching Views. 6096 * @param searched The text to match against. 6097 * 6098 * @see #FIND_VIEWS_WITH_TEXT 6099 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6100 * @see #setContentDescription(CharSequence) 6101 */ 6102 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6103 if (getAccessibilityNodeProvider() != null) { 6104 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6105 outViews.add(this); 6106 } 6107 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6108 && (searched != null && searched.length() > 0) 6109 && (mContentDescription != null && mContentDescription.length() > 0)) { 6110 String searchedLowerCase = searched.toString().toLowerCase(); 6111 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6112 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6113 outViews.add(this); 6114 } 6115 } 6116 } 6117 6118 /** 6119 * Find and return all touchable views that are descendants of this view, 6120 * possibly including this view if it is touchable itself. 6121 * 6122 * @return A list of touchable views 6123 */ 6124 public ArrayList<View> getTouchables() { 6125 ArrayList<View> result = new ArrayList<View>(); 6126 addTouchables(result); 6127 return result; 6128 } 6129 6130 /** 6131 * Add any touchable views that are descendants of this view (possibly 6132 * including this view if it is touchable itself) to views. 6133 * 6134 * @param views Touchable views found so far 6135 */ 6136 public void addTouchables(ArrayList<View> views) { 6137 final int viewFlags = mViewFlags; 6138 6139 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6140 && (viewFlags & ENABLED_MASK) == ENABLED) { 6141 views.add(this); 6142 } 6143 } 6144 6145 /** 6146 * Returns whether this View is accessibility focused. 6147 * 6148 * @return True if this View is accessibility focused. 6149 */ 6150 boolean isAccessibilityFocused() { 6151 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 6152 } 6153 6154 /** 6155 * Call this to try to give accessibility focus to this view. 6156 * 6157 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6158 * returns false or the view is no visible or the view already has accessibility 6159 * focus. 6160 * 6161 * See also {@link #focusSearch(int)}, which is what you call to say that you 6162 * have focus, and you want your parent to look for the next one. 6163 * 6164 * @return Whether this view actually took accessibility focus. 6165 * 6166 * @hide 6167 */ 6168 public boolean requestAccessibilityFocus() { 6169 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6170 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6171 return false; 6172 } 6173 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6174 return false; 6175 } 6176 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6177 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6178 ViewRootImpl viewRootImpl = getViewRootImpl(); 6179 if (viewRootImpl != null) { 6180 viewRootImpl.setAccessibilityFocusedHost(this); 6181 } 6182 invalidate(); 6183 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6184 notifyAccessibilityStateChanged(); 6185 return true; 6186 } 6187 return false; 6188 } 6189 6190 /** 6191 * Call this to try to clear accessibility focus of this view. 6192 * 6193 * See also {@link #focusSearch(int)}, which is what you call to say that you 6194 * have focus, and you want your parent to look for the next one. 6195 * 6196 * @hide 6197 */ 6198 public void clearAccessibilityFocus() { 6199 ViewRootImpl viewRootImpl = getViewRootImpl(); 6200 if (viewRootImpl != null) { 6201 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6202 if (focusHost != null && focusHost != this 6203 && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6204 viewRootImpl.setAccessibilityFocusedHost(null); 6205 } 6206 } 6207 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6208 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6209 invalidate(); 6210 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6211 notifyAccessibilityStateChanged(); 6212 6213 // Clear the text navigation state. 6214 setAccessibilityCursorPosition(-1); 6215 } 6216 } 6217 6218 private void requestAccessibilityFocusFromHover() { 6219 if (includeForAccessibility() && isActionableForAccessibility()) { 6220 requestAccessibilityFocus(); 6221 requestFocusNoSearch(View.FOCUS_DOWN, null); 6222 } else { 6223 if (mParent != null) { 6224 View nextFocus = mParent.findViewToTakeAccessibilityFocusFromHover(this, this); 6225 if (nextFocus != null) { 6226 nextFocus.requestAccessibilityFocus(); 6227 nextFocus.requestFocusNoSearch(View.FOCUS_DOWN, null); 6228 } 6229 } 6230 } 6231 } 6232 6233 /** 6234 * @hide 6235 */ 6236 public boolean canTakeAccessibilityFocusFromHover() { 6237 if (includeForAccessibility() && isActionableForAccessibility()) { 6238 return true; 6239 } 6240 if (mParent != null) { 6241 return (mParent.findViewToTakeAccessibilityFocusFromHover(this, this) == this); 6242 } 6243 return false; 6244 } 6245 6246 /** 6247 * Clears accessibility focus without calling any callback methods 6248 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6249 * is used for clearing accessibility focus when giving this focus to 6250 * another view. 6251 */ 6252 void clearAccessibilityFocusNoCallbacks() { 6253 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6254 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6255 invalidate(); 6256 } 6257 } 6258 6259 /** 6260 * Call this to try to give focus to a specific view or to one of its 6261 * descendants. 6262 * 6263 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6264 * false), or if it is focusable and it is not focusable in touch mode 6265 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6266 * 6267 * See also {@link #focusSearch(int)}, which is what you call to say that you 6268 * have focus, and you want your parent to look for the next one. 6269 * 6270 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6271 * {@link #FOCUS_DOWN} and <code>null</code>. 6272 * 6273 * @return Whether this view or one of its descendants actually took focus. 6274 */ 6275 public final boolean requestFocus() { 6276 return requestFocus(View.FOCUS_DOWN); 6277 } 6278 6279 /** 6280 * Call this to try to give focus to a specific view or to one of its 6281 * descendants and give it a hint about what direction focus is heading. 6282 * 6283 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6284 * false), or if it is focusable and it is not focusable in touch mode 6285 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6286 * 6287 * See also {@link #focusSearch(int)}, which is what you call to say that you 6288 * have focus, and you want your parent to look for the next one. 6289 * 6290 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6291 * <code>null</code> set for the previously focused rectangle. 6292 * 6293 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6294 * @return Whether this view or one of its descendants actually took focus. 6295 */ 6296 public final boolean requestFocus(int direction) { 6297 return requestFocus(direction, null); 6298 } 6299 6300 /** 6301 * Call this to try to give focus to a specific view or to one of its descendants 6302 * and give it hints about the direction and a specific rectangle that the focus 6303 * is coming from. The rectangle can help give larger views a finer grained hint 6304 * about where focus is coming from, and therefore, where to show selection, or 6305 * forward focus change internally. 6306 * 6307 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6308 * false), or if it is focusable and it is not focusable in touch mode 6309 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6310 * 6311 * A View will not take focus if it is not visible. 6312 * 6313 * A View will not take focus if one of its parents has 6314 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6315 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6316 * 6317 * See also {@link #focusSearch(int)}, which is what you call to say that you 6318 * have focus, and you want your parent to look for the next one. 6319 * 6320 * You may wish to override this method if your custom {@link View} has an internal 6321 * {@link View} that it wishes to forward the request to. 6322 * 6323 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6324 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6325 * to give a finer grained hint about where focus is coming from. May be null 6326 * if there is no hint. 6327 * @return Whether this view or one of its descendants actually took focus. 6328 */ 6329 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6330 return requestFocusNoSearch(direction, previouslyFocusedRect); 6331 } 6332 6333 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6334 // need to be focusable 6335 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6336 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6337 return false; 6338 } 6339 6340 // need to be focusable in touch mode if in touch mode 6341 if (isInTouchMode() && 6342 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6343 return false; 6344 } 6345 6346 // need to not have any parents blocking us 6347 if (hasAncestorThatBlocksDescendantFocus()) { 6348 return false; 6349 } 6350 6351 handleFocusGainInternal(direction, previouslyFocusedRect); 6352 return true; 6353 } 6354 6355 /** 6356 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6357 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6358 * touch mode to request focus when they are touched. 6359 * 6360 * @return Whether this view or one of its descendants actually took focus. 6361 * 6362 * @see #isInTouchMode() 6363 * 6364 */ 6365 public final boolean requestFocusFromTouch() { 6366 // Leave touch mode if we need to 6367 if (isInTouchMode()) { 6368 ViewRootImpl viewRoot = getViewRootImpl(); 6369 if (viewRoot != null) { 6370 viewRoot.ensureTouchMode(false); 6371 } 6372 } 6373 return requestFocus(View.FOCUS_DOWN); 6374 } 6375 6376 /** 6377 * @return Whether any ancestor of this view blocks descendant focus. 6378 */ 6379 private boolean hasAncestorThatBlocksDescendantFocus() { 6380 ViewParent ancestor = mParent; 6381 while (ancestor instanceof ViewGroup) { 6382 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6383 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6384 return true; 6385 } else { 6386 ancestor = vgAncestor.getParent(); 6387 } 6388 } 6389 return false; 6390 } 6391 6392 /** 6393 * Gets the mode for determining whether this View is important for accessibility 6394 * which is if it fires accessibility events and if it is reported to 6395 * accessibility services that query the screen. 6396 * 6397 * @return The mode for determining whether a View is important for accessibility. 6398 * 6399 * @attr ref android.R.styleable#View_importantForAccessibility 6400 * 6401 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6402 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6403 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6404 */ 6405 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6406 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, 6407 to = "IMPORTANT_FOR_ACCESSIBILITY_AUTO"), 6408 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, 6409 to = "IMPORTANT_FOR_ACCESSIBILITY_YES"), 6410 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, 6411 to = "IMPORTANT_FOR_ACCESSIBILITY_NO") 6412 }) 6413 public int getImportantForAccessibility() { 6414 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6415 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6416 } 6417 6418 /** 6419 * Sets how to determine whether this view is important for accessibility 6420 * which is if it fires accessibility events and if it is reported to 6421 * accessibility services that query the screen. 6422 * 6423 * @param mode How to determine whether this view is important for accessibility. 6424 * 6425 * @attr ref android.R.styleable#View_importantForAccessibility 6426 * 6427 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6428 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6429 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6430 */ 6431 public void setImportantForAccessibility(int mode) { 6432 if (mode != getImportantForAccessibility()) { 6433 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6434 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6435 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6436 notifyAccessibilityStateChanged(); 6437 } 6438 } 6439 6440 /** 6441 * Gets whether this view should be exposed for accessibility. 6442 * 6443 * @return Whether the view is exposed for accessibility. 6444 * 6445 * @hide 6446 */ 6447 public boolean isImportantForAccessibility() { 6448 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6449 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6450 switch (mode) { 6451 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6452 return true; 6453 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6454 return false; 6455 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6456 return isActionableForAccessibility() || hasListenersForAccessibility(); 6457 default: 6458 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6459 + mode); 6460 } 6461 } 6462 6463 /** 6464 * Gets the parent for accessibility purposes. Note that the parent for 6465 * accessibility is not necessary the immediate parent. It is the first 6466 * predecessor that is important for accessibility. 6467 * 6468 * @return The parent for accessibility purposes. 6469 */ 6470 public ViewParent getParentForAccessibility() { 6471 if (mParent instanceof View) { 6472 View parentView = (View) mParent; 6473 if (parentView.includeForAccessibility()) { 6474 return mParent; 6475 } else { 6476 return mParent.getParentForAccessibility(); 6477 } 6478 } 6479 return null; 6480 } 6481 6482 /** 6483 * Adds the children of a given View for accessibility. Since some Views are 6484 * not important for accessibility the children for accessibility are not 6485 * necessarily direct children of the riew, rather they are the first level of 6486 * descendants important for accessibility. 6487 * 6488 * @param children The list of children for accessibility. 6489 */ 6490 public void addChildrenForAccessibility(ArrayList<View> children) { 6491 if (includeForAccessibility()) { 6492 children.add(this); 6493 } 6494 } 6495 6496 /** 6497 * Whether to regard this view for accessibility. A view is regarded for 6498 * accessibility if it is important for accessibility or the querying 6499 * accessibility service has explicitly requested that view not 6500 * important for accessibility are regarded. 6501 * 6502 * @return Whether to regard the view for accessibility. 6503 * 6504 * @hide 6505 */ 6506 public boolean includeForAccessibility() { 6507 if (mAttachInfo != null) { 6508 if (!mAttachInfo.mIncludeNotImportantViews) { 6509 return isImportantForAccessibility(); 6510 } 6511 return true; 6512 } 6513 return false; 6514 } 6515 6516 /** 6517 * Returns whether the View is considered actionable from 6518 * accessibility perspective. Such view are important for 6519 * accessiiblity. 6520 * 6521 * @return True if the view is actionable for accessibility. 6522 * 6523 * @hide 6524 */ 6525 public boolean isActionableForAccessibility() { 6526 return (isClickable() || isLongClickable() || isFocusable()); 6527 } 6528 6529 /** 6530 * Returns whether the View has registered callbacks wich makes it 6531 * important for accessiiblity. 6532 * 6533 * @return True if the view is actionable for accessibility. 6534 */ 6535 private boolean hasListenersForAccessibility() { 6536 ListenerInfo info = getListenerInfo(); 6537 return mTouchDelegate != null || info.mOnKeyListener != null 6538 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6539 || info.mOnHoverListener != null || info.mOnDragListener != null; 6540 } 6541 6542 /** 6543 * Notifies accessibility services that some view's important for 6544 * accessibility state has changed. Note that such notifications 6545 * are made at most once every 6546 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6547 * to avoid unnecessary load to the system. Also once a view has 6548 * made a notifucation this method is a NOP until the notification has 6549 * been sent to clients. 6550 * 6551 * @hide 6552 * 6553 * TODO: Makse sure this method is called for any view state change 6554 * that is interesting for accessilility purposes. 6555 */ 6556 public void notifyAccessibilityStateChanged() { 6557 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6558 return; 6559 } 6560 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6561 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6562 if (mParent != null) { 6563 mParent.childAccessibilityStateChanged(this); 6564 } 6565 } 6566 } 6567 6568 /** 6569 * Reset the state indicating the this view has requested clients 6570 * interested in its accessiblity state to be notified. 6571 * 6572 * @hide 6573 */ 6574 public void resetAccessibilityStateChanged() { 6575 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6576 } 6577 6578 /** 6579 * Performs the specified accessibility action on the view. For 6580 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6581 * <p> 6582 * If an {@link AccessibilityDelegate} has been specified via calling 6583 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6584 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6585 * is responsible for handling this call. 6586 * </p> 6587 * 6588 * @param action The action to perform. 6589 * @param arguments Optional action arguments. 6590 * @return Whether the action was performed. 6591 */ 6592 public boolean performAccessibilityAction(int action, Bundle arguments) { 6593 if (mAccessibilityDelegate != null) { 6594 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6595 } else { 6596 return performAccessibilityActionInternal(action, arguments); 6597 } 6598 } 6599 6600 /** 6601 * @see #performAccessibilityAction(int, Bundle) 6602 * 6603 * Note: Called from the default {@link AccessibilityDelegate}. 6604 */ 6605 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 6606 switch (action) { 6607 case AccessibilityNodeInfo.ACTION_CLICK: { 6608 if (isClickable()) { 6609 return performClick(); 6610 } 6611 } break; 6612 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6613 if (isLongClickable()) { 6614 return performLongClick(); 6615 } 6616 } break; 6617 case AccessibilityNodeInfo.ACTION_FOCUS: { 6618 if (!hasFocus()) { 6619 // Get out of touch mode since accessibility 6620 // wants to move focus around. 6621 getViewRootImpl().ensureTouchMode(false); 6622 return requestFocus(); 6623 } 6624 } break; 6625 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6626 if (hasFocus()) { 6627 clearFocus(); 6628 return !isFocused(); 6629 } 6630 } break; 6631 case AccessibilityNodeInfo.ACTION_SELECT: { 6632 if (!isSelected()) { 6633 setSelected(true); 6634 return isSelected(); 6635 } 6636 } break; 6637 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6638 if (isSelected()) { 6639 setSelected(false); 6640 return !isSelected(); 6641 } 6642 } break; 6643 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6644 if (!isAccessibilityFocused()) { 6645 return requestAccessibilityFocus(); 6646 } 6647 } break; 6648 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6649 if (isAccessibilityFocused()) { 6650 clearAccessibilityFocus(); 6651 return true; 6652 } 6653 } break; 6654 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6655 if (arguments != null) { 6656 final int granularity = arguments.getInt( 6657 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6658 return nextAtGranularity(granularity); 6659 } 6660 } break; 6661 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6662 if (arguments != null) { 6663 final int granularity = arguments.getInt( 6664 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6665 return previousAtGranularity(granularity); 6666 } 6667 } break; 6668 } 6669 return false; 6670 } 6671 6672 private boolean nextAtGranularity(int granularity) { 6673 CharSequence text = getIterableTextForAccessibility(); 6674 if (text == null || text.length() == 0) { 6675 return false; 6676 } 6677 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6678 if (iterator == null) { 6679 return false; 6680 } 6681 final int current = getAccessibilityCursorPosition(); 6682 final int[] range = iterator.following(current); 6683 if (range == null) { 6684 setAccessibilityCursorPosition(-1); 6685 return false; 6686 } 6687 final int start = range[0]; 6688 final int end = range[1]; 6689 setAccessibilityCursorPosition(start); 6690 sendViewTextTraversedAtGranularityEvent( 6691 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6692 granularity, start, end); 6693 return true; 6694 } 6695 6696 private boolean previousAtGranularity(int granularity) { 6697 CharSequence text = getIterableTextForAccessibility(); 6698 if (text == null || text.length() == 0) { 6699 return false; 6700 } 6701 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6702 if (iterator == null) { 6703 return false; 6704 } 6705 final int selectionStart = getAccessibilityCursorPosition(); 6706 final int current = selectionStart >= 0 ? selectionStart : text.length() + 1; 6707 final int[] range = iterator.preceding(current); 6708 if (range == null) { 6709 setAccessibilityCursorPosition(-1); 6710 return false; 6711 } 6712 final int start = range[0]; 6713 final int end = range[1]; 6714 setAccessibilityCursorPosition(end); 6715 sendViewTextTraversedAtGranularityEvent( 6716 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 6717 granularity, start, end); 6718 return true; 6719 } 6720 6721 /** 6722 * Gets the text reported for accessibility purposes. 6723 * 6724 * @return The accessibility text. 6725 * 6726 * @hide 6727 */ 6728 public CharSequence getIterableTextForAccessibility() { 6729 return mContentDescription; 6730 } 6731 6732 /** 6733 * @hide 6734 */ 6735 public int getAccessibilityCursorPosition() { 6736 return mAccessibilityCursorPosition; 6737 } 6738 6739 /** 6740 * @hide 6741 */ 6742 public void setAccessibilityCursorPosition(int position) { 6743 mAccessibilityCursorPosition = position; 6744 } 6745 6746 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 6747 int fromIndex, int toIndex) { 6748 if (mParent == null) { 6749 return; 6750 } 6751 AccessibilityEvent event = AccessibilityEvent.obtain( 6752 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 6753 onInitializeAccessibilityEvent(event); 6754 onPopulateAccessibilityEvent(event); 6755 event.setFromIndex(fromIndex); 6756 event.setToIndex(toIndex); 6757 event.setAction(action); 6758 event.setMovementGranularity(granularity); 6759 mParent.requestSendAccessibilityEvent(this, event); 6760 } 6761 6762 /** 6763 * @hide 6764 */ 6765 public TextSegmentIterator getIteratorForGranularity(int granularity) { 6766 switch (granularity) { 6767 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 6768 CharSequence text = getIterableTextForAccessibility(); 6769 if (text != null && text.length() > 0) { 6770 CharacterTextSegmentIterator iterator = 6771 CharacterTextSegmentIterator.getInstance(mContext); 6772 iterator.initialize(text.toString()); 6773 return iterator; 6774 } 6775 } break; 6776 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 6777 CharSequence text = getIterableTextForAccessibility(); 6778 if (text != null && text.length() > 0) { 6779 WordTextSegmentIterator iterator = 6780 WordTextSegmentIterator.getInstance(mContext); 6781 iterator.initialize(text.toString()); 6782 return iterator; 6783 } 6784 } break; 6785 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 6786 CharSequence text = getIterableTextForAccessibility(); 6787 if (text != null && text.length() > 0) { 6788 ParagraphTextSegmentIterator iterator = 6789 ParagraphTextSegmentIterator.getInstance(); 6790 iterator.initialize(text.toString()); 6791 return iterator; 6792 } 6793 } break; 6794 } 6795 return null; 6796 } 6797 6798 /** 6799 * @hide 6800 */ 6801 public void dispatchStartTemporaryDetach() { 6802 clearAccessibilityFocus(); 6803 onStartTemporaryDetach(); 6804 } 6805 6806 /** 6807 * This is called when a container is going to temporarily detach a child, with 6808 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6809 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6810 * {@link #onDetachedFromWindow()} when the container is done. 6811 */ 6812 public void onStartTemporaryDetach() { 6813 removeUnsetPressCallback(); 6814 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6815 } 6816 6817 /** 6818 * @hide 6819 */ 6820 public void dispatchFinishTemporaryDetach() { 6821 onFinishTemporaryDetach(); 6822 } 6823 6824 /** 6825 * Called after {@link #onStartTemporaryDetach} when the container is done 6826 * changing the view. 6827 */ 6828 public void onFinishTemporaryDetach() { 6829 } 6830 6831 /** 6832 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6833 * for this view's window. Returns null if the view is not currently attached 6834 * to the window. Normally you will not need to use this directly, but 6835 * just use the standard high-level event callbacks like 6836 * {@link #onKeyDown(int, KeyEvent)}. 6837 */ 6838 public KeyEvent.DispatcherState getKeyDispatcherState() { 6839 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6840 } 6841 6842 /** 6843 * Dispatch a key event before it is processed by any input method 6844 * associated with the view hierarchy. This can be used to intercept 6845 * key events in special situations before the IME consumes them; a 6846 * typical example would be handling the BACK key to update the application's 6847 * UI instead of allowing the IME to see it and close itself. 6848 * 6849 * @param event The key event to be dispatched. 6850 * @return True if the event was handled, false otherwise. 6851 */ 6852 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6853 return onKeyPreIme(event.getKeyCode(), event); 6854 } 6855 6856 /** 6857 * Dispatch a key event to the next view on the focus path. This path runs 6858 * from the top of the view tree down to the currently focused view. If this 6859 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6860 * the next node down the focus path. This method also fires any key 6861 * listeners. 6862 * 6863 * @param event The key event to be dispatched. 6864 * @return True if the event was handled, false otherwise. 6865 */ 6866 public boolean dispatchKeyEvent(KeyEvent event) { 6867 if (mInputEventConsistencyVerifier != null) { 6868 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6869 } 6870 6871 // Give any attached key listener a first crack at the event. 6872 //noinspection SimplifiableIfStatement 6873 ListenerInfo li = mListenerInfo; 6874 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6875 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6876 return true; 6877 } 6878 6879 if (event.dispatch(this, mAttachInfo != null 6880 ? mAttachInfo.mKeyDispatchState : null, this)) { 6881 return true; 6882 } 6883 6884 if (mInputEventConsistencyVerifier != null) { 6885 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6886 } 6887 return false; 6888 } 6889 6890 /** 6891 * Dispatches a key shortcut event. 6892 * 6893 * @param event The key event to be dispatched. 6894 * @return True if the event was handled by the view, false otherwise. 6895 */ 6896 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6897 return onKeyShortcut(event.getKeyCode(), event); 6898 } 6899 6900 /** 6901 * Pass the touch screen motion event down to the target view, or this 6902 * view if it is the target. 6903 * 6904 * @param event The motion event to be dispatched. 6905 * @return True if the event was handled by the view, false otherwise. 6906 */ 6907 public boolean dispatchTouchEvent(MotionEvent event) { 6908 if (mInputEventConsistencyVerifier != null) { 6909 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6910 } 6911 6912 if (onFilterTouchEventForSecurity(event)) { 6913 //noinspection SimplifiableIfStatement 6914 ListenerInfo li = mListenerInfo; 6915 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6916 && li.mOnTouchListener.onTouch(this, event)) { 6917 return true; 6918 } 6919 6920 if (onTouchEvent(event)) { 6921 return true; 6922 } 6923 } 6924 6925 if (mInputEventConsistencyVerifier != null) { 6926 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6927 } 6928 return false; 6929 } 6930 6931 /** 6932 * Filter the touch event to apply security policies. 6933 * 6934 * @param event The motion event to be filtered. 6935 * @return True if the event should be dispatched, false if the event should be dropped. 6936 * 6937 * @see #getFilterTouchesWhenObscured 6938 */ 6939 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6940 //noinspection RedundantIfStatement 6941 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6942 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6943 // Window is obscured, drop this touch. 6944 return false; 6945 } 6946 return true; 6947 } 6948 6949 /** 6950 * Pass a trackball motion event down to the focused view. 6951 * 6952 * @param event The motion event to be dispatched. 6953 * @return True if the event was handled by the view, false otherwise. 6954 */ 6955 public boolean dispatchTrackballEvent(MotionEvent event) { 6956 if (mInputEventConsistencyVerifier != null) { 6957 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6958 } 6959 6960 return onTrackballEvent(event); 6961 } 6962 6963 /** 6964 * Dispatch a generic motion event. 6965 * <p> 6966 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6967 * are delivered to the view under the pointer. All other generic motion events are 6968 * delivered to the focused view. Hover events are handled specially and are delivered 6969 * to {@link #onHoverEvent(MotionEvent)}. 6970 * </p> 6971 * 6972 * @param event The motion event to be dispatched. 6973 * @return True if the event was handled by the view, false otherwise. 6974 */ 6975 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6976 if (mInputEventConsistencyVerifier != null) { 6977 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6978 } 6979 6980 final int source = event.getSource(); 6981 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6982 final int action = event.getAction(); 6983 if (action == MotionEvent.ACTION_HOVER_ENTER 6984 || action == MotionEvent.ACTION_HOVER_MOVE 6985 || action == MotionEvent.ACTION_HOVER_EXIT) { 6986 if (dispatchHoverEvent(event)) { 6987 return true; 6988 } 6989 } else if (dispatchGenericPointerEvent(event)) { 6990 return true; 6991 } 6992 } else if (dispatchGenericFocusedEvent(event)) { 6993 return true; 6994 } 6995 6996 if (dispatchGenericMotionEventInternal(event)) { 6997 return true; 6998 } 6999 7000 if (mInputEventConsistencyVerifier != null) { 7001 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7002 } 7003 return false; 7004 } 7005 7006 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 7007 //noinspection SimplifiableIfStatement 7008 ListenerInfo li = mListenerInfo; 7009 if (li != null && li.mOnGenericMotionListener != null 7010 && (mViewFlags & ENABLED_MASK) == ENABLED 7011 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 7012 return true; 7013 } 7014 7015 if (onGenericMotionEvent(event)) { 7016 return true; 7017 } 7018 7019 if (mInputEventConsistencyVerifier != null) { 7020 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7021 } 7022 return false; 7023 } 7024 7025 /** 7026 * Dispatch a hover event. 7027 * <p> 7028 * Do not call this method directly. 7029 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7030 * </p> 7031 * 7032 * @param event The motion event to be dispatched. 7033 * @return True if the event was handled by the view, false otherwise. 7034 */ 7035 protected boolean dispatchHoverEvent(MotionEvent event) { 7036 //noinspection SimplifiableIfStatement 7037 ListenerInfo li = mListenerInfo; 7038 if (li != null && li.mOnHoverListener != null 7039 && (mViewFlags & ENABLED_MASK) == ENABLED 7040 && li.mOnHoverListener.onHover(this, event)) { 7041 return true; 7042 } 7043 7044 return onHoverEvent(event); 7045 } 7046 7047 /** 7048 * Returns true if the view has a child to which it has recently sent 7049 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7050 * it does not have a hovered child, then it must be the innermost hovered view. 7051 * @hide 7052 */ 7053 protected boolean hasHoveredChild() { 7054 return false; 7055 } 7056 7057 /** 7058 * Dispatch a generic motion event to the view under the first pointer. 7059 * <p> 7060 * Do not call this method directly. 7061 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7062 * </p> 7063 * 7064 * @param event The motion event to be dispatched. 7065 * @return True if the event was handled by the view, false otherwise. 7066 */ 7067 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7068 return false; 7069 } 7070 7071 /** 7072 * Dispatch a generic motion event to the currently focused view. 7073 * <p> 7074 * Do not call this method directly. 7075 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7076 * </p> 7077 * 7078 * @param event The motion event to be dispatched. 7079 * @return True if the event was handled by the view, false otherwise. 7080 */ 7081 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7082 return false; 7083 } 7084 7085 /** 7086 * Dispatch a pointer event. 7087 * <p> 7088 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7089 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7090 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7091 * and should not be expected to handle other pointing device features. 7092 * </p> 7093 * 7094 * @param event The motion event to be dispatched. 7095 * @return True if the event was handled by the view, false otherwise. 7096 * @hide 7097 */ 7098 public final boolean dispatchPointerEvent(MotionEvent event) { 7099 if (event.isTouchEvent()) { 7100 return dispatchTouchEvent(event); 7101 } else { 7102 return dispatchGenericMotionEvent(event); 7103 } 7104 } 7105 7106 /** 7107 * Called when the window containing this view gains or loses window focus. 7108 * ViewGroups should override to route to their children. 7109 * 7110 * @param hasFocus True if the window containing this view now has focus, 7111 * false otherwise. 7112 */ 7113 public void dispatchWindowFocusChanged(boolean hasFocus) { 7114 onWindowFocusChanged(hasFocus); 7115 } 7116 7117 /** 7118 * Called when the window containing this view gains or loses focus. Note 7119 * that this is separate from view focus: to receive key events, both 7120 * your view and its window must have focus. If a window is displayed 7121 * on top of yours that takes input focus, then your own window will lose 7122 * focus but the view focus will remain unchanged. 7123 * 7124 * @param hasWindowFocus True if the window containing this view now has 7125 * focus, false otherwise. 7126 */ 7127 public void onWindowFocusChanged(boolean hasWindowFocus) { 7128 InputMethodManager imm = InputMethodManager.peekInstance(); 7129 if (!hasWindowFocus) { 7130 if (isPressed()) { 7131 setPressed(false); 7132 } 7133 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7134 imm.focusOut(this); 7135 } 7136 removeLongPressCallback(); 7137 removeTapCallback(); 7138 onFocusLost(); 7139 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7140 imm.focusIn(this); 7141 } 7142 refreshDrawableState(); 7143 } 7144 7145 /** 7146 * Returns true if this view is in a window that currently has window focus. 7147 * Note that this is not the same as the view itself having focus. 7148 * 7149 * @return True if this view is in a window that currently has window focus. 7150 */ 7151 public boolean hasWindowFocus() { 7152 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7153 } 7154 7155 /** 7156 * Dispatch a view visibility change down the view hierarchy. 7157 * ViewGroups should override to route to their children. 7158 * @param changedView The view whose visibility changed. Could be 'this' or 7159 * an ancestor view. 7160 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7161 * {@link #INVISIBLE} or {@link #GONE}. 7162 */ 7163 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7164 onVisibilityChanged(changedView, visibility); 7165 } 7166 7167 /** 7168 * Called when the visibility of the view or an ancestor of the view is changed. 7169 * @param changedView The view whose visibility changed. Could be 'this' or 7170 * an ancestor view. 7171 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7172 * {@link #INVISIBLE} or {@link #GONE}. 7173 */ 7174 protected void onVisibilityChanged(View changedView, int visibility) { 7175 if (visibility == VISIBLE) { 7176 if (mAttachInfo != null) { 7177 initialAwakenScrollBars(); 7178 } else { 7179 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 7180 } 7181 } 7182 } 7183 7184 /** 7185 * Dispatch a hint about whether this view is displayed. For instance, when 7186 * a View moves out of the screen, it might receives a display hint indicating 7187 * the view is not displayed. Applications should not <em>rely</em> on this hint 7188 * as there is no guarantee that they will receive one. 7189 * 7190 * @param hint A hint about whether or not this view is displayed: 7191 * {@link #VISIBLE} or {@link #INVISIBLE}. 7192 */ 7193 public void dispatchDisplayHint(int hint) { 7194 onDisplayHint(hint); 7195 } 7196 7197 /** 7198 * Gives this view a hint about whether is displayed or not. For instance, when 7199 * a View moves out of the screen, it might receives a display hint indicating 7200 * the view is not displayed. Applications should not <em>rely</em> on this hint 7201 * as there is no guarantee that they will receive one. 7202 * 7203 * @param hint A hint about whether or not this view is displayed: 7204 * {@link #VISIBLE} or {@link #INVISIBLE}. 7205 */ 7206 protected void onDisplayHint(int hint) { 7207 } 7208 7209 /** 7210 * Dispatch a window visibility change down the view hierarchy. 7211 * ViewGroups should override to route to their children. 7212 * 7213 * @param visibility The new visibility of the window. 7214 * 7215 * @see #onWindowVisibilityChanged(int) 7216 */ 7217 public void dispatchWindowVisibilityChanged(int visibility) { 7218 onWindowVisibilityChanged(visibility); 7219 } 7220 7221 /** 7222 * Called when the window containing has change its visibility 7223 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7224 * that this tells you whether or not your window is being made visible 7225 * to the window manager; this does <em>not</em> tell you whether or not 7226 * your window is obscured by other windows on the screen, even if it 7227 * is itself visible. 7228 * 7229 * @param visibility The new visibility of the window. 7230 */ 7231 protected void onWindowVisibilityChanged(int visibility) { 7232 if (visibility == VISIBLE) { 7233 initialAwakenScrollBars(); 7234 } 7235 } 7236 7237 /** 7238 * Returns the current visibility of the window this view is attached to 7239 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7240 * 7241 * @return Returns the current visibility of the view's window. 7242 */ 7243 public int getWindowVisibility() { 7244 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7245 } 7246 7247 /** 7248 * Retrieve the overall visible display size in which the window this view is 7249 * attached to has been positioned in. This takes into account screen 7250 * decorations above the window, for both cases where the window itself 7251 * is being position inside of them or the window is being placed under 7252 * then and covered insets are used for the window to position its content 7253 * inside. In effect, this tells you the available area where content can 7254 * be placed and remain visible to users. 7255 * 7256 * <p>This function requires an IPC back to the window manager to retrieve 7257 * the requested information, so should not be used in performance critical 7258 * code like drawing. 7259 * 7260 * @param outRect Filled in with the visible display frame. If the view 7261 * is not attached to a window, this is simply the raw display size. 7262 */ 7263 public void getWindowVisibleDisplayFrame(Rect outRect) { 7264 if (mAttachInfo != null) { 7265 try { 7266 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7267 } catch (RemoteException e) { 7268 return; 7269 } 7270 // XXX This is really broken, and probably all needs to be done 7271 // in the window manager, and we need to know more about whether 7272 // we want the area behind or in front of the IME. 7273 final Rect insets = mAttachInfo.mVisibleInsets; 7274 outRect.left += insets.left; 7275 outRect.top += insets.top; 7276 outRect.right -= insets.right; 7277 outRect.bottom -= insets.bottom; 7278 return; 7279 } 7280 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 7281 d.getRectSize(outRect); 7282 } 7283 7284 /** 7285 * Dispatch a notification about a resource configuration change down 7286 * the view hierarchy. 7287 * ViewGroups should override to route to their children. 7288 * 7289 * @param newConfig The new resource configuration. 7290 * 7291 * @see #onConfigurationChanged(android.content.res.Configuration) 7292 */ 7293 public void dispatchConfigurationChanged(Configuration newConfig) { 7294 onConfigurationChanged(newConfig); 7295 } 7296 7297 /** 7298 * Called when the current configuration of the resources being used 7299 * by the application have changed. You can use this to decide when 7300 * to reload resources that can changed based on orientation and other 7301 * configuration characterstics. You only need to use this if you are 7302 * not relying on the normal {@link android.app.Activity} mechanism of 7303 * recreating the activity instance upon a configuration change. 7304 * 7305 * @param newConfig The new resource configuration. 7306 */ 7307 protected void onConfigurationChanged(Configuration newConfig) { 7308 } 7309 7310 /** 7311 * Private function to aggregate all per-view attributes in to the view 7312 * root. 7313 */ 7314 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7315 performCollectViewAttributes(attachInfo, visibility); 7316 } 7317 7318 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7319 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7320 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7321 attachInfo.mKeepScreenOn = true; 7322 } 7323 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7324 ListenerInfo li = mListenerInfo; 7325 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7326 attachInfo.mHasSystemUiListeners = true; 7327 } 7328 } 7329 } 7330 7331 void needGlobalAttributesUpdate(boolean force) { 7332 final AttachInfo ai = mAttachInfo; 7333 if (ai != null) { 7334 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7335 || ai.mHasSystemUiListeners) { 7336 ai.mRecomputeGlobalAttributes = true; 7337 } 7338 } 7339 } 7340 7341 /** 7342 * Returns whether the device is currently in touch mode. Touch mode is entered 7343 * once the user begins interacting with the device by touch, and affects various 7344 * things like whether focus is always visible to the user. 7345 * 7346 * @return Whether the device is in touch mode. 7347 */ 7348 @ViewDebug.ExportedProperty 7349 public boolean isInTouchMode() { 7350 if (mAttachInfo != null) { 7351 return mAttachInfo.mInTouchMode; 7352 } else { 7353 return ViewRootImpl.isInTouchMode(); 7354 } 7355 } 7356 7357 /** 7358 * Returns the context the view is running in, through which it can 7359 * access the current theme, resources, etc. 7360 * 7361 * @return The view's Context. 7362 */ 7363 @ViewDebug.CapturedViewProperty 7364 public final Context getContext() { 7365 return mContext; 7366 } 7367 7368 /** 7369 * Handle a key event before it is processed by any input method 7370 * associated with the view hierarchy. This can be used to intercept 7371 * key events in special situations before the IME consumes them; a 7372 * typical example would be handling the BACK key to update the application's 7373 * UI instead of allowing the IME to see it and close itself. 7374 * 7375 * @param keyCode The value in event.getKeyCode(). 7376 * @param event Description of the key event. 7377 * @return If you handled the event, return true. If you want to allow the 7378 * event to be handled by the next receiver, return false. 7379 */ 7380 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7381 return false; 7382 } 7383 7384 /** 7385 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7386 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7387 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7388 * is released, if the view is enabled and clickable. 7389 * 7390 * @param keyCode A key code that represents the button pressed, from 7391 * {@link android.view.KeyEvent}. 7392 * @param event The KeyEvent object that defines the button action. 7393 */ 7394 public boolean onKeyDown(int keyCode, KeyEvent event) { 7395 boolean result = false; 7396 7397 switch (keyCode) { 7398 case KeyEvent.KEYCODE_DPAD_CENTER: 7399 case KeyEvent.KEYCODE_ENTER: { 7400 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7401 return true; 7402 } 7403 // Long clickable items don't necessarily have to be clickable 7404 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7405 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7406 (event.getRepeatCount() == 0)) { 7407 setPressed(true); 7408 checkForLongClick(0); 7409 return true; 7410 } 7411 break; 7412 } 7413 } 7414 return result; 7415 } 7416 7417 /** 7418 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7419 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7420 * the event). 7421 */ 7422 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7423 return false; 7424 } 7425 7426 /** 7427 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7428 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7429 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7430 * {@link KeyEvent#KEYCODE_ENTER} is released. 7431 * 7432 * @param keyCode A key code that represents the button pressed, from 7433 * {@link android.view.KeyEvent}. 7434 * @param event The KeyEvent object that defines the button action. 7435 */ 7436 public boolean onKeyUp(int keyCode, KeyEvent event) { 7437 boolean result = false; 7438 7439 switch (keyCode) { 7440 case KeyEvent.KEYCODE_DPAD_CENTER: 7441 case KeyEvent.KEYCODE_ENTER: { 7442 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7443 return true; 7444 } 7445 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7446 setPressed(false); 7447 7448 if (!mHasPerformedLongPress) { 7449 // This is a tap, so remove the longpress check 7450 removeLongPressCallback(); 7451 7452 result = performClick(); 7453 } 7454 } 7455 break; 7456 } 7457 } 7458 return result; 7459 } 7460 7461 /** 7462 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7463 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7464 * the event). 7465 * 7466 * @param keyCode A key code that represents the button pressed, from 7467 * {@link android.view.KeyEvent}. 7468 * @param repeatCount The number of times the action was made. 7469 * @param event The KeyEvent object that defines the button action. 7470 */ 7471 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7472 return false; 7473 } 7474 7475 /** 7476 * Called on the focused view when a key shortcut event is not handled. 7477 * Override this method to implement local key shortcuts for the View. 7478 * Key shortcuts can also be implemented by setting the 7479 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7480 * 7481 * @param keyCode The value in event.getKeyCode(). 7482 * @param event Description of the key event. 7483 * @return If you handled the event, return true. If you want to allow the 7484 * event to be handled by the next receiver, return false. 7485 */ 7486 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7487 return false; 7488 } 7489 7490 /** 7491 * Check whether the called view is a text editor, in which case it 7492 * would make sense to automatically display a soft input window for 7493 * it. Subclasses should override this if they implement 7494 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7495 * a call on that method would return a non-null InputConnection, and 7496 * they are really a first-class editor that the user would normally 7497 * start typing on when the go into a window containing your view. 7498 * 7499 * <p>The default implementation always returns false. This does 7500 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7501 * will not be called or the user can not otherwise perform edits on your 7502 * view; it is just a hint to the system that this is not the primary 7503 * purpose of this view. 7504 * 7505 * @return Returns true if this view is a text editor, else false. 7506 */ 7507 public boolean onCheckIsTextEditor() { 7508 return false; 7509 } 7510 7511 /** 7512 * Create a new InputConnection for an InputMethod to interact 7513 * with the view. The default implementation returns null, since it doesn't 7514 * support input methods. You can override this to implement such support. 7515 * This is only needed for views that take focus and text input. 7516 * 7517 * <p>When implementing this, you probably also want to implement 7518 * {@link #onCheckIsTextEditor()} to indicate you will return a 7519 * non-null InputConnection. 7520 * 7521 * @param outAttrs Fill in with attribute information about the connection. 7522 */ 7523 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7524 return null; 7525 } 7526 7527 /** 7528 * Called by the {@link android.view.inputmethod.InputMethodManager} 7529 * when a view who is not the current 7530 * input connection target is trying to make a call on the manager. The 7531 * default implementation returns false; you can override this to return 7532 * true for certain views if you are performing InputConnection proxying 7533 * to them. 7534 * @param view The View that is making the InputMethodManager call. 7535 * @return Return true to allow the call, false to reject. 7536 */ 7537 public boolean checkInputConnectionProxy(View view) { 7538 return false; 7539 } 7540 7541 /** 7542 * Show the context menu for this view. It is not safe to hold on to the 7543 * menu after returning from this method. 7544 * 7545 * You should normally not overload this method. Overload 7546 * {@link #onCreateContextMenu(ContextMenu)} or define an 7547 * {@link OnCreateContextMenuListener} to add items to the context menu. 7548 * 7549 * @param menu The context menu to populate 7550 */ 7551 public void createContextMenu(ContextMenu menu) { 7552 ContextMenuInfo menuInfo = getContextMenuInfo(); 7553 7554 // Sets the current menu info so all items added to menu will have 7555 // my extra info set. 7556 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7557 7558 onCreateContextMenu(menu); 7559 ListenerInfo li = mListenerInfo; 7560 if (li != null && li.mOnCreateContextMenuListener != null) { 7561 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7562 } 7563 7564 // Clear the extra information so subsequent items that aren't mine don't 7565 // have my extra info. 7566 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7567 7568 if (mParent != null) { 7569 mParent.createContextMenu(menu); 7570 } 7571 } 7572 7573 /** 7574 * Views should implement this if they have extra information to associate 7575 * with the context menu. The return result is supplied as a parameter to 7576 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7577 * callback. 7578 * 7579 * @return Extra information about the item for which the context menu 7580 * should be shown. This information will vary across different 7581 * subclasses of View. 7582 */ 7583 protected ContextMenuInfo getContextMenuInfo() { 7584 return null; 7585 } 7586 7587 /** 7588 * Views should implement this if the view itself is going to add items to 7589 * the context menu. 7590 * 7591 * @param menu the context menu to populate 7592 */ 7593 protected void onCreateContextMenu(ContextMenu menu) { 7594 } 7595 7596 /** 7597 * Implement this method to handle trackball motion events. The 7598 * <em>relative</em> movement of the trackball since the last event 7599 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7600 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7601 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7602 * they will often be fractional values, representing the more fine-grained 7603 * movement information available from a trackball). 7604 * 7605 * @param event The motion event. 7606 * @return True if the event was handled, false otherwise. 7607 */ 7608 public boolean onTrackballEvent(MotionEvent event) { 7609 return false; 7610 } 7611 7612 /** 7613 * Implement this method to handle generic motion events. 7614 * <p> 7615 * Generic motion events describe joystick movements, mouse hovers, track pad 7616 * touches, scroll wheel movements and other input events. The 7617 * {@link MotionEvent#getSource() source} of the motion event specifies 7618 * the class of input that was received. Implementations of this method 7619 * must examine the bits in the source before processing the event. 7620 * The following code example shows how this is done. 7621 * </p><p> 7622 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7623 * are delivered to the view under the pointer. All other generic motion events are 7624 * delivered to the focused view. 7625 * </p> 7626 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7627 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7628 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7629 * // process the joystick movement... 7630 * return true; 7631 * } 7632 * } 7633 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7634 * switch (event.getAction()) { 7635 * case MotionEvent.ACTION_HOVER_MOVE: 7636 * // process the mouse hover movement... 7637 * return true; 7638 * case MotionEvent.ACTION_SCROLL: 7639 * // process the scroll wheel movement... 7640 * return true; 7641 * } 7642 * } 7643 * return super.onGenericMotionEvent(event); 7644 * }</pre> 7645 * 7646 * @param event The generic motion event being processed. 7647 * @return True if the event was handled, false otherwise. 7648 */ 7649 public boolean onGenericMotionEvent(MotionEvent event) { 7650 return false; 7651 } 7652 7653 /** 7654 * Implement this method to handle hover events. 7655 * <p> 7656 * This method is called whenever a pointer is hovering into, over, or out of the 7657 * bounds of a view and the view is not currently being touched. 7658 * Hover events are represented as pointer events with action 7659 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7660 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7661 * </p> 7662 * <ul> 7663 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7664 * when the pointer enters the bounds of the view.</li> 7665 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7666 * when the pointer has already entered the bounds of the view and has moved.</li> 7667 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7668 * when the pointer has exited the bounds of the view or when the pointer is 7669 * about to go down due to a button click, tap, or similar user action that 7670 * causes the view to be touched.</li> 7671 * </ul> 7672 * <p> 7673 * The view should implement this method to return true to indicate that it is 7674 * handling the hover event, such as by changing its drawable state. 7675 * </p><p> 7676 * The default implementation calls {@link #setHovered} to update the hovered state 7677 * of the view when a hover enter or hover exit event is received, if the view 7678 * is enabled and is clickable. The default implementation also sends hover 7679 * accessibility events. 7680 * </p> 7681 * 7682 * @param event The motion event that describes the hover. 7683 * @return True if the view handled the hover event. 7684 * 7685 * @see #isHovered 7686 * @see #setHovered 7687 * @see #onHoverChanged 7688 */ 7689 public boolean onHoverEvent(MotionEvent event) { 7690 // The root view may receive hover (or touch) events that are outside the bounds of 7691 // the window. This code ensures that we only send accessibility events for 7692 // hovers that are actually within the bounds of the root view. 7693 final int action = event.getActionMasked(); 7694 if (!mSendingHoverAccessibilityEvents) { 7695 if ((action == MotionEvent.ACTION_HOVER_ENTER 7696 || action == MotionEvent.ACTION_HOVER_MOVE) 7697 && !hasHoveredChild() 7698 && pointInView(event.getX(), event.getY())) { 7699 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7700 mSendingHoverAccessibilityEvents = true; 7701 requestAccessibilityFocusFromHover(); 7702 } 7703 } else { 7704 if (action == MotionEvent.ACTION_HOVER_EXIT 7705 || (action == MotionEvent.ACTION_MOVE 7706 && !pointInView(event.getX(), event.getY()))) { 7707 mSendingHoverAccessibilityEvents = false; 7708 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7709 // If the window does not have input focus we take away accessibility 7710 // focus as soon as the user stop hovering over the view. 7711 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7712 getViewRootImpl().setAccessibilityFocusedHost(null); 7713 } 7714 } 7715 } 7716 7717 if (isHoverable()) { 7718 switch (action) { 7719 case MotionEvent.ACTION_HOVER_ENTER: 7720 setHovered(true); 7721 break; 7722 case MotionEvent.ACTION_HOVER_EXIT: 7723 setHovered(false); 7724 break; 7725 } 7726 7727 // Dispatch the event to onGenericMotionEvent before returning true. 7728 // This is to provide compatibility with existing applications that 7729 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7730 // break because of the new default handling for hoverable views 7731 // in onHoverEvent. 7732 // Note that onGenericMotionEvent will be called by default when 7733 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7734 dispatchGenericMotionEventInternal(event); 7735 return true; 7736 } 7737 7738 return false; 7739 } 7740 7741 /** 7742 * Returns true if the view should handle {@link #onHoverEvent} 7743 * by calling {@link #setHovered} to change its hovered state. 7744 * 7745 * @return True if the view is hoverable. 7746 */ 7747 private boolean isHoverable() { 7748 final int viewFlags = mViewFlags; 7749 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7750 return false; 7751 } 7752 7753 return (viewFlags & CLICKABLE) == CLICKABLE 7754 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7755 } 7756 7757 /** 7758 * Returns true if the view is currently hovered. 7759 * 7760 * @return True if the view is currently hovered. 7761 * 7762 * @see #setHovered 7763 * @see #onHoverChanged 7764 */ 7765 @ViewDebug.ExportedProperty 7766 public boolean isHovered() { 7767 return (mPrivateFlags & HOVERED) != 0; 7768 } 7769 7770 /** 7771 * Sets whether the view is currently hovered. 7772 * <p> 7773 * Calling this method also changes the drawable state of the view. This 7774 * enables the view to react to hover by using different drawable resources 7775 * to change its appearance. 7776 * </p><p> 7777 * The {@link #onHoverChanged} method is called when the hovered state changes. 7778 * </p> 7779 * 7780 * @param hovered True if the view is hovered. 7781 * 7782 * @see #isHovered 7783 * @see #onHoverChanged 7784 */ 7785 public void setHovered(boolean hovered) { 7786 if (hovered) { 7787 if ((mPrivateFlags & HOVERED) == 0) { 7788 mPrivateFlags |= HOVERED; 7789 refreshDrawableState(); 7790 onHoverChanged(true); 7791 } 7792 } else { 7793 if ((mPrivateFlags & HOVERED) != 0) { 7794 mPrivateFlags &= ~HOVERED; 7795 refreshDrawableState(); 7796 onHoverChanged(false); 7797 } 7798 } 7799 } 7800 7801 /** 7802 * Implement this method to handle hover state changes. 7803 * <p> 7804 * This method is called whenever the hover state changes as a result of a 7805 * call to {@link #setHovered}. 7806 * </p> 7807 * 7808 * @param hovered The current hover state, as returned by {@link #isHovered}. 7809 * 7810 * @see #isHovered 7811 * @see #setHovered 7812 */ 7813 public void onHoverChanged(boolean hovered) { 7814 } 7815 7816 /** 7817 * Implement this method to handle touch screen motion events. 7818 * 7819 * @param event The motion event. 7820 * @return True if the event was handled, false otherwise. 7821 */ 7822 public boolean onTouchEvent(MotionEvent event) { 7823 final int viewFlags = mViewFlags; 7824 7825 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7826 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7827 setPressed(false); 7828 } 7829 // A disabled view that is clickable still consumes the touch 7830 // events, it just doesn't respond to them. 7831 return (((viewFlags & CLICKABLE) == CLICKABLE || 7832 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7833 } 7834 7835 if (mTouchDelegate != null) { 7836 if (mTouchDelegate.onTouchEvent(event)) { 7837 return true; 7838 } 7839 } 7840 7841 if (((viewFlags & CLICKABLE) == CLICKABLE || 7842 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7843 switch (event.getAction()) { 7844 case MotionEvent.ACTION_UP: 7845 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7846 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7847 // take focus if we don't have it already and we should in 7848 // touch mode. 7849 boolean focusTaken = false; 7850 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7851 focusTaken = requestFocus(); 7852 } 7853 7854 if (prepressed) { 7855 // The button is being released before we actually 7856 // showed it as pressed. Make it show the pressed 7857 // state now (before scheduling the click) to ensure 7858 // the user sees it. 7859 setPressed(true); 7860 } 7861 7862 if (!mHasPerformedLongPress) { 7863 // This is a tap, so remove the longpress check 7864 removeLongPressCallback(); 7865 7866 // Only perform take click actions if we were in the pressed state 7867 if (!focusTaken) { 7868 // Use a Runnable and post this rather than calling 7869 // performClick directly. This lets other visual state 7870 // of the view update before click actions start. 7871 if (mPerformClick == null) { 7872 mPerformClick = new PerformClick(); 7873 } 7874 if (!post(mPerformClick)) { 7875 performClick(); 7876 } 7877 } 7878 } 7879 7880 if (mUnsetPressedState == null) { 7881 mUnsetPressedState = new UnsetPressedState(); 7882 } 7883 7884 if (prepressed) { 7885 postDelayed(mUnsetPressedState, 7886 ViewConfiguration.getPressedStateDuration()); 7887 } else if (!post(mUnsetPressedState)) { 7888 // If the post failed, unpress right now 7889 mUnsetPressedState.run(); 7890 } 7891 removeTapCallback(); 7892 } 7893 break; 7894 7895 case MotionEvent.ACTION_DOWN: 7896 mHasPerformedLongPress = false; 7897 7898 if (performButtonActionOnTouchDown(event)) { 7899 break; 7900 } 7901 7902 // Walk up the hierarchy to determine if we're inside a scrolling container. 7903 boolean isInScrollingContainer = isInScrollingContainer(); 7904 7905 // For views inside a scrolling container, delay the pressed feedback for 7906 // a short period in case this is a scroll. 7907 if (isInScrollingContainer) { 7908 mPrivateFlags |= PREPRESSED; 7909 if (mPendingCheckForTap == null) { 7910 mPendingCheckForTap = new CheckForTap(); 7911 } 7912 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7913 } else { 7914 // Not inside a scrolling container, so show the feedback right away 7915 setPressed(true); 7916 checkForLongClick(0); 7917 } 7918 break; 7919 7920 case MotionEvent.ACTION_CANCEL: 7921 setPressed(false); 7922 removeTapCallback(); 7923 break; 7924 7925 case MotionEvent.ACTION_MOVE: 7926 final int x = (int) event.getX(); 7927 final int y = (int) event.getY(); 7928 7929 // Be lenient about moving outside of buttons 7930 if (!pointInView(x, y, mTouchSlop)) { 7931 // Outside button 7932 removeTapCallback(); 7933 if ((mPrivateFlags & PRESSED) != 0) { 7934 // Remove any future long press/tap checks 7935 removeLongPressCallback(); 7936 7937 setPressed(false); 7938 } 7939 } 7940 break; 7941 } 7942 return true; 7943 } 7944 7945 return false; 7946 } 7947 7948 /** 7949 * @hide 7950 */ 7951 public boolean isInScrollingContainer() { 7952 ViewParent p = getParent(); 7953 while (p != null && p instanceof ViewGroup) { 7954 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7955 return true; 7956 } 7957 p = p.getParent(); 7958 } 7959 return false; 7960 } 7961 7962 /** 7963 * Remove the longpress detection timer. 7964 */ 7965 private void removeLongPressCallback() { 7966 if (mPendingCheckForLongPress != null) { 7967 removeCallbacks(mPendingCheckForLongPress); 7968 } 7969 } 7970 7971 /** 7972 * Remove the pending click action 7973 */ 7974 private void removePerformClickCallback() { 7975 if (mPerformClick != null) { 7976 removeCallbacks(mPerformClick); 7977 } 7978 } 7979 7980 /** 7981 * Remove the prepress detection timer. 7982 */ 7983 private void removeUnsetPressCallback() { 7984 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7985 setPressed(false); 7986 removeCallbacks(mUnsetPressedState); 7987 } 7988 } 7989 7990 /** 7991 * Remove the tap detection timer. 7992 */ 7993 private void removeTapCallback() { 7994 if (mPendingCheckForTap != null) { 7995 mPrivateFlags &= ~PREPRESSED; 7996 removeCallbacks(mPendingCheckForTap); 7997 } 7998 } 7999 8000 /** 8001 * Cancels a pending long press. Your subclass can use this if you 8002 * want the context menu to come up if the user presses and holds 8003 * at the same place, but you don't want it to come up if they press 8004 * and then move around enough to cause scrolling. 8005 */ 8006 public void cancelLongPress() { 8007 removeLongPressCallback(); 8008 8009 /* 8010 * The prepressed state handled by the tap callback is a display 8011 * construct, but the tap callback will post a long press callback 8012 * less its own timeout. Remove it here. 8013 */ 8014 removeTapCallback(); 8015 } 8016 8017 /** 8018 * Remove the pending callback for sending a 8019 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8020 */ 8021 private void removeSendViewScrolledAccessibilityEventCallback() { 8022 if (mSendViewScrolledAccessibilityEvent != null) { 8023 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8024 } 8025 } 8026 8027 /** 8028 * Sets the TouchDelegate for this View. 8029 */ 8030 public void setTouchDelegate(TouchDelegate delegate) { 8031 mTouchDelegate = delegate; 8032 } 8033 8034 /** 8035 * Gets the TouchDelegate for this View. 8036 */ 8037 public TouchDelegate getTouchDelegate() { 8038 return mTouchDelegate; 8039 } 8040 8041 /** 8042 * Set flags controlling behavior of this view. 8043 * 8044 * @param flags Constant indicating the value which should be set 8045 * @param mask Constant indicating the bit range that should be changed 8046 */ 8047 void setFlags(int flags, int mask) { 8048 int old = mViewFlags; 8049 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8050 8051 int changed = mViewFlags ^ old; 8052 if (changed == 0) { 8053 return; 8054 } 8055 int privateFlags = mPrivateFlags; 8056 8057 /* Check if the FOCUSABLE bit has changed */ 8058 if (((changed & FOCUSABLE_MASK) != 0) && 8059 ((privateFlags & HAS_BOUNDS) !=0)) { 8060 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8061 && ((privateFlags & FOCUSED) != 0)) { 8062 /* Give up focus if we are no longer focusable */ 8063 clearFocus(); 8064 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8065 && ((privateFlags & FOCUSED) == 0)) { 8066 /* 8067 * Tell the view system that we are now available to take focus 8068 * if no one else already has it. 8069 */ 8070 if (mParent != null) mParent.focusableViewAvailable(this); 8071 } 8072 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8073 notifyAccessibilityStateChanged(); 8074 } 8075 } 8076 8077 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8078 if ((changed & VISIBILITY_MASK) != 0) { 8079 /* 8080 * If this view is becoming visible, invalidate it in case it changed while 8081 * it was not visible. Marking it drawn ensures that the invalidation will 8082 * go through. 8083 */ 8084 mPrivateFlags |= DRAWN; 8085 invalidate(true); 8086 8087 needGlobalAttributesUpdate(true); 8088 8089 // a view becoming visible is worth notifying the parent 8090 // about in case nothing has focus. even if this specific view 8091 // isn't focusable, it may contain something that is, so let 8092 // the root view try to give this focus if nothing else does. 8093 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8094 mParent.focusableViewAvailable(this); 8095 } 8096 } 8097 } 8098 8099 /* Check if the GONE bit has changed */ 8100 if ((changed & GONE) != 0) { 8101 needGlobalAttributesUpdate(false); 8102 requestLayout(); 8103 8104 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8105 if (hasFocus()) clearFocus(); 8106 clearAccessibilityFocus(); 8107 destroyDrawingCache(); 8108 if (mParent instanceof View) { 8109 // GONE views noop invalidation, so invalidate the parent 8110 ((View) mParent).invalidate(true); 8111 } 8112 // Mark the view drawn to ensure that it gets invalidated properly the next 8113 // time it is visible and gets invalidated 8114 mPrivateFlags |= DRAWN; 8115 } 8116 if (mAttachInfo != null) { 8117 mAttachInfo.mViewVisibilityChanged = true; 8118 } 8119 } 8120 8121 /* Check if the VISIBLE bit has changed */ 8122 if ((changed & INVISIBLE) != 0) { 8123 needGlobalAttributesUpdate(false); 8124 /* 8125 * If this view is becoming invisible, set the DRAWN flag so that 8126 * the next invalidate() will not be skipped. 8127 */ 8128 mPrivateFlags |= DRAWN; 8129 8130 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8131 // root view becoming invisible shouldn't clear focus and accessibility focus 8132 if (getRootView() != this) { 8133 clearFocus(); 8134 clearAccessibilityFocus(); 8135 } 8136 } 8137 if (mAttachInfo != null) { 8138 mAttachInfo.mViewVisibilityChanged = true; 8139 } 8140 } 8141 8142 if ((changed & VISIBILITY_MASK) != 0) { 8143 if (mParent instanceof ViewGroup) { 8144 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8145 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8146 ((View) mParent).invalidate(true); 8147 } else if (mParent != null) { 8148 mParent.invalidateChild(this, null); 8149 } 8150 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8151 } 8152 8153 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8154 destroyDrawingCache(); 8155 } 8156 8157 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8158 destroyDrawingCache(); 8159 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8160 invalidateParentCaches(); 8161 } 8162 8163 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8164 destroyDrawingCache(); 8165 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8166 } 8167 8168 if ((changed & DRAW_MASK) != 0) { 8169 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8170 if (mBackground != null) { 8171 mPrivateFlags &= ~SKIP_DRAW; 8172 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8173 } else { 8174 mPrivateFlags |= SKIP_DRAW; 8175 } 8176 } else { 8177 mPrivateFlags &= ~SKIP_DRAW; 8178 } 8179 requestLayout(); 8180 invalidate(true); 8181 } 8182 8183 if ((changed & KEEP_SCREEN_ON) != 0) { 8184 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8185 mParent.recomputeViewAttributes(this); 8186 } 8187 } 8188 8189 if (AccessibilityManager.getInstance(mContext).isEnabled() 8190 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8191 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8192 notifyAccessibilityStateChanged(); 8193 } 8194 } 8195 8196 /** 8197 * Change the view's z order in the tree, so it's on top of other sibling 8198 * views 8199 */ 8200 public void bringToFront() { 8201 if (mParent != null) { 8202 mParent.bringChildToFront(this); 8203 } 8204 } 8205 8206 /** 8207 * This is called in response to an internal scroll in this view (i.e., the 8208 * view scrolled its own contents). This is typically as a result of 8209 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8210 * called. 8211 * 8212 * @param l Current horizontal scroll origin. 8213 * @param t Current vertical scroll origin. 8214 * @param oldl Previous horizontal scroll origin. 8215 * @param oldt Previous vertical scroll origin. 8216 */ 8217 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8218 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8219 postSendViewScrolledAccessibilityEventCallback(); 8220 } 8221 8222 mBackgroundSizeChanged = true; 8223 8224 final AttachInfo ai = mAttachInfo; 8225 if (ai != null) { 8226 ai.mViewScrollChanged = true; 8227 } 8228 } 8229 8230 /** 8231 * Interface definition for a callback to be invoked when the layout bounds of a view 8232 * changes due to layout processing. 8233 */ 8234 public interface OnLayoutChangeListener { 8235 /** 8236 * Called when the focus state of a view has changed. 8237 * 8238 * @param v The view whose state has changed. 8239 * @param left The new value of the view's left property. 8240 * @param top The new value of the view's top property. 8241 * @param right The new value of the view's right property. 8242 * @param bottom The new value of the view's bottom property. 8243 * @param oldLeft The previous value of the view's left property. 8244 * @param oldTop The previous value of the view's top property. 8245 * @param oldRight The previous value of the view's right property. 8246 * @param oldBottom The previous value of the view's bottom property. 8247 */ 8248 void onLayoutChange(View v, int left, int top, int right, int bottom, 8249 int oldLeft, int oldTop, int oldRight, int oldBottom); 8250 } 8251 8252 /** 8253 * This is called during layout when the size of this view has changed. If 8254 * you were just added to the view hierarchy, you're called with the old 8255 * values of 0. 8256 * 8257 * @param w Current width of this view. 8258 * @param h Current height of this view. 8259 * @param oldw Old width of this view. 8260 * @param oldh Old height of this view. 8261 */ 8262 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8263 } 8264 8265 /** 8266 * Called by draw to draw the child views. This may be overridden 8267 * by derived classes to gain control just before its children are drawn 8268 * (but after its own view has been drawn). 8269 * @param canvas the canvas on which to draw the view 8270 */ 8271 protected void dispatchDraw(Canvas canvas) { 8272 8273 } 8274 8275 /** 8276 * Gets the parent of this view. Note that the parent is a 8277 * ViewParent and not necessarily a View. 8278 * 8279 * @return Parent of this view. 8280 */ 8281 public final ViewParent getParent() { 8282 return mParent; 8283 } 8284 8285 /** 8286 * Set the horizontal scrolled position of your view. This will cause a call to 8287 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8288 * invalidated. 8289 * @param value the x position to scroll to 8290 */ 8291 public void setScrollX(int value) { 8292 scrollTo(value, mScrollY); 8293 } 8294 8295 /** 8296 * Set the vertical scrolled position of your view. This will cause a call to 8297 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8298 * invalidated. 8299 * @param value the y position to scroll to 8300 */ 8301 public void setScrollY(int value) { 8302 scrollTo(mScrollX, value); 8303 } 8304 8305 /** 8306 * Return the scrolled left position of this view. This is the left edge of 8307 * the displayed part of your view. You do not need to draw any pixels 8308 * farther left, since those are outside of the frame of your view on 8309 * screen. 8310 * 8311 * @return The left edge of the displayed part of your view, in pixels. 8312 */ 8313 public final int getScrollX() { 8314 return mScrollX; 8315 } 8316 8317 /** 8318 * Return the scrolled top position of this view. This is the top edge of 8319 * the displayed part of your view. You do not need to draw any pixels above 8320 * it, since those are outside of the frame of your view on screen. 8321 * 8322 * @return The top edge of the displayed part of your view, in pixels. 8323 */ 8324 public final int getScrollY() { 8325 return mScrollY; 8326 } 8327 8328 /** 8329 * Return the width of the your view. 8330 * 8331 * @return The width of your view, in pixels. 8332 */ 8333 @ViewDebug.ExportedProperty(category = "layout") 8334 public final int getWidth() { 8335 return mRight - mLeft; 8336 } 8337 8338 /** 8339 * Return the height of your view. 8340 * 8341 * @return The height of your view, in pixels. 8342 */ 8343 @ViewDebug.ExportedProperty(category = "layout") 8344 public final int getHeight() { 8345 return mBottom - mTop; 8346 } 8347 8348 /** 8349 * Return the visible drawing bounds of your view. Fills in the output 8350 * rectangle with the values from getScrollX(), getScrollY(), 8351 * getWidth(), and getHeight(). 8352 * 8353 * @param outRect The (scrolled) drawing bounds of the view. 8354 */ 8355 public void getDrawingRect(Rect outRect) { 8356 outRect.left = mScrollX; 8357 outRect.top = mScrollY; 8358 outRect.right = mScrollX + (mRight - mLeft); 8359 outRect.bottom = mScrollY + (mBottom - mTop); 8360 } 8361 8362 /** 8363 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8364 * raw width component (that is the result is masked by 8365 * {@link #MEASURED_SIZE_MASK}). 8366 * 8367 * @return The raw measured width of this view. 8368 */ 8369 public final int getMeasuredWidth() { 8370 return mMeasuredWidth & MEASURED_SIZE_MASK; 8371 } 8372 8373 /** 8374 * Return the full width measurement information for this view as computed 8375 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8376 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8377 * This should be used during measurement and layout calculations only. Use 8378 * {@link #getWidth()} to see how wide a view is after layout. 8379 * 8380 * @return The measured width of this view as a bit mask. 8381 */ 8382 public final int getMeasuredWidthAndState() { 8383 return mMeasuredWidth; 8384 } 8385 8386 /** 8387 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8388 * raw width component (that is the result is masked by 8389 * {@link #MEASURED_SIZE_MASK}). 8390 * 8391 * @return The raw measured height of this view. 8392 */ 8393 public final int getMeasuredHeight() { 8394 return mMeasuredHeight & MEASURED_SIZE_MASK; 8395 } 8396 8397 /** 8398 * Return the full height measurement information for this view as computed 8399 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8400 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8401 * This should be used during measurement and layout calculations only. Use 8402 * {@link #getHeight()} to see how wide a view is after layout. 8403 * 8404 * @return The measured width of this view as a bit mask. 8405 */ 8406 public final int getMeasuredHeightAndState() { 8407 return mMeasuredHeight; 8408 } 8409 8410 /** 8411 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8412 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8413 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8414 * and the height component is at the shifted bits 8415 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8416 */ 8417 public final int getMeasuredState() { 8418 return (mMeasuredWidth&MEASURED_STATE_MASK) 8419 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8420 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8421 } 8422 8423 /** 8424 * The transform matrix of this view, which is calculated based on the current 8425 * roation, scale, and pivot properties. 8426 * 8427 * @see #getRotation() 8428 * @see #getScaleX() 8429 * @see #getScaleY() 8430 * @see #getPivotX() 8431 * @see #getPivotY() 8432 * @return The current transform matrix for the view 8433 */ 8434 public Matrix getMatrix() { 8435 if (mTransformationInfo != null) { 8436 updateMatrix(); 8437 return mTransformationInfo.mMatrix; 8438 } 8439 return Matrix.IDENTITY_MATRIX; 8440 } 8441 8442 /** 8443 * Utility function to determine if the value is far enough away from zero to be 8444 * considered non-zero. 8445 * @param value A floating point value to check for zero-ness 8446 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8447 */ 8448 private static boolean nonzero(float value) { 8449 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8450 } 8451 8452 /** 8453 * Returns true if the transform matrix is the identity matrix. 8454 * Recomputes the matrix if necessary. 8455 * 8456 * @return True if the transform matrix is the identity matrix, false otherwise. 8457 */ 8458 final boolean hasIdentityMatrix() { 8459 if (mTransformationInfo != null) { 8460 updateMatrix(); 8461 return mTransformationInfo.mMatrixIsIdentity; 8462 } 8463 return true; 8464 } 8465 8466 void ensureTransformationInfo() { 8467 if (mTransformationInfo == null) { 8468 mTransformationInfo = new TransformationInfo(); 8469 } 8470 } 8471 8472 /** 8473 * Recomputes the transform matrix if necessary. 8474 */ 8475 private void updateMatrix() { 8476 final TransformationInfo info = mTransformationInfo; 8477 if (info == null) { 8478 return; 8479 } 8480 if (info.mMatrixDirty) { 8481 // transform-related properties have changed since the last time someone 8482 // asked for the matrix; recalculate it with the current values 8483 8484 // Figure out if we need to update the pivot point 8485 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8486 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8487 info.mPrevWidth = mRight - mLeft; 8488 info.mPrevHeight = mBottom - mTop; 8489 info.mPivotX = info.mPrevWidth / 2f; 8490 info.mPivotY = info.mPrevHeight / 2f; 8491 } 8492 } 8493 info.mMatrix.reset(); 8494 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8495 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8496 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8497 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8498 } else { 8499 if (info.mCamera == null) { 8500 info.mCamera = new Camera(); 8501 info.matrix3D = new Matrix(); 8502 } 8503 info.mCamera.save(); 8504 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8505 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8506 info.mCamera.getMatrix(info.matrix3D); 8507 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8508 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8509 info.mPivotY + info.mTranslationY); 8510 info.mMatrix.postConcat(info.matrix3D); 8511 info.mCamera.restore(); 8512 } 8513 info.mMatrixDirty = false; 8514 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8515 info.mInverseMatrixDirty = true; 8516 } 8517 } 8518 8519 /** 8520 * Utility method to retrieve the inverse of the current mMatrix property. 8521 * We cache the matrix to avoid recalculating it when transform properties 8522 * have not changed. 8523 * 8524 * @return The inverse of the current matrix of this view. 8525 */ 8526 final Matrix getInverseMatrix() { 8527 final TransformationInfo info = mTransformationInfo; 8528 if (info != null) { 8529 updateMatrix(); 8530 if (info.mInverseMatrixDirty) { 8531 if (info.mInverseMatrix == null) { 8532 info.mInverseMatrix = new Matrix(); 8533 } 8534 info.mMatrix.invert(info.mInverseMatrix); 8535 info.mInverseMatrixDirty = false; 8536 } 8537 return info.mInverseMatrix; 8538 } 8539 return Matrix.IDENTITY_MATRIX; 8540 } 8541 8542 /** 8543 * Gets the distance along the Z axis from the camera to this view. 8544 * 8545 * @see #setCameraDistance(float) 8546 * 8547 * @return The distance along the Z axis. 8548 */ 8549 public float getCameraDistance() { 8550 ensureTransformationInfo(); 8551 final float dpi = mResources.getDisplayMetrics().densityDpi; 8552 final TransformationInfo info = mTransformationInfo; 8553 if (info.mCamera == null) { 8554 info.mCamera = new Camera(); 8555 info.matrix3D = new Matrix(); 8556 } 8557 return -(info.mCamera.getLocationZ() * dpi); 8558 } 8559 8560 /** 8561 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8562 * views are drawn) from the camera to this view. The camera's distance 8563 * affects 3D transformations, for instance rotations around the X and Y 8564 * axis. If the rotationX or rotationY properties are changed and this view is 8565 * large (more than half the size of the screen), it is recommended to always 8566 * use a camera distance that's greater than the height (X axis rotation) or 8567 * the width (Y axis rotation) of this view.</p> 8568 * 8569 * <p>The distance of the camera from the view plane can have an affect on the 8570 * perspective distortion of the view when it is rotated around the x or y axis. 8571 * For example, a large distance will result in a large viewing angle, and there 8572 * will not be much perspective distortion of the view as it rotates. A short 8573 * distance may cause much more perspective distortion upon rotation, and can 8574 * also result in some drawing artifacts if the rotated view ends up partially 8575 * behind the camera (which is why the recommendation is to use a distance at 8576 * least as far as the size of the view, if the view is to be rotated.)</p> 8577 * 8578 * <p>The distance is expressed in "depth pixels." The default distance depends 8579 * on the screen density. For instance, on a medium density display, the 8580 * default distance is 1280. On a high density display, the default distance 8581 * is 1920.</p> 8582 * 8583 * <p>If you want to specify a distance that leads to visually consistent 8584 * results across various densities, use the following formula:</p> 8585 * <pre> 8586 * float scale = context.getResources().getDisplayMetrics().density; 8587 * view.setCameraDistance(distance * scale); 8588 * </pre> 8589 * 8590 * <p>The density scale factor of a high density display is 1.5, 8591 * and 1920 = 1280 * 1.5.</p> 8592 * 8593 * @param distance The distance in "depth pixels", if negative the opposite 8594 * value is used 8595 * 8596 * @see #setRotationX(float) 8597 * @see #setRotationY(float) 8598 */ 8599 public void setCameraDistance(float distance) { 8600 invalidateViewProperty(true, false); 8601 8602 ensureTransformationInfo(); 8603 final float dpi = mResources.getDisplayMetrics().densityDpi; 8604 final TransformationInfo info = mTransformationInfo; 8605 if (info.mCamera == null) { 8606 info.mCamera = new Camera(); 8607 info.matrix3D = new Matrix(); 8608 } 8609 8610 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8611 info.mMatrixDirty = true; 8612 8613 invalidateViewProperty(false, false); 8614 if (mDisplayList != null) { 8615 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8616 } 8617 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8618 // View was rejected last time it was drawn by its parent; this may have changed 8619 invalidateParentIfNeeded(); 8620 } 8621 } 8622 8623 /** 8624 * The degrees that the view is rotated around the pivot point. 8625 * 8626 * @see #setRotation(float) 8627 * @see #getPivotX() 8628 * @see #getPivotY() 8629 * 8630 * @return The degrees of rotation. 8631 */ 8632 @ViewDebug.ExportedProperty(category = "drawing") 8633 public float getRotation() { 8634 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8635 } 8636 8637 /** 8638 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8639 * result in clockwise rotation. 8640 * 8641 * @param rotation The degrees of rotation. 8642 * 8643 * @see #getRotation() 8644 * @see #getPivotX() 8645 * @see #getPivotY() 8646 * @see #setRotationX(float) 8647 * @see #setRotationY(float) 8648 * 8649 * @attr ref android.R.styleable#View_rotation 8650 */ 8651 public void setRotation(float rotation) { 8652 ensureTransformationInfo(); 8653 final TransformationInfo info = mTransformationInfo; 8654 if (info.mRotation != rotation) { 8655 // Double-invalidation is necessary to capture view's old and new areas 8656 invalidateViewProperty(true, false); 8657 info.mRotation = rotation; 8658 info.mMatrixDirty = true; 8659 invalidateViewProperty(false, true); 8660 if (mDisplayList != null) { 8661 mDisplayList.setRotation(rotation); 8662 } 8663 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8664 // View was rejected last time it was drawn by its parent; this may have changed 8665 invalidateParentIfNeeded(); 8666 } 8667 } 8668 } 8669 8670 /** 8671 * The degrees that the view is rotated around the vertical axis through the pivot point. 8672 * 8673 * @see #getPivotX() 8674 * @see #getPivotY() 8675 * @see #setRotationY(float) 8676 * 8677 * @return The degrees of Y rotation. 8678 */ 8679 @ViewDebug.ExportedProperty(category = "drawing") 8680 public float getRotationY() { 8681 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8682 } 8683 8684 /** 8685 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8686 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8687 * down the y axis. 8688 * 8689 * When rotating large views, it is recommended to adjust the camera distance 8690 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8691 * 8692 * @param rotationY The degrees of Y rotation. 8693 * 8694 * @see #getRotationY() 8695 * @see #getPivotX() 8696 * @see #getPivotY() 8697 * @see #setRotation(float) 8698 * @see #setRotationX(float) 8699 * @see #setCameraDistance(float) 8700 * 8701 * @attr ref android.R.styleable#View_rotationY 8702 */ 8703 public void setRotationY(float rotationY) { 8704 ensureTransformationInfo(); 8705 final TransformationInfo info = mTransformationInfo; 8706 if (info.mRotationY != rotationY) { 8707 invalidateViewProperty(true, false); 8708 info.mRotationY = rotationY; 8709 info.mMatrixDirty = true; 8710 invalidateViewProperty(false, true); 8711 if (mDisplayList != null) { 8712 mDisplayList.setRotationY(rotationY); 8713 } 8714 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8715 // View was rejected last time it was drawn by its parent; this may have changed 8716 invalidateParentIfNeeded(); 8717 } 8718 } 8719 } 8720 8721 /** 8722 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8723 * 8724 * @see #getPivotX() 8725 * @see #getPivotY() 8726 * @see #setRotationX(float) 8727 * 8728 * @return The degrees of X rotation. 8729 */ 8730 @ViewDebug.ExportedProperty(category = "drawing") 8731 public float getRotationX() { 8732 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8733 } 8734 8735 /** 8736 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8737 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8738 * x axis. 8739 * 8740 * When rotating large views, it is recommended to adjust the camera distance 8741 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8742 * 8743 * @param rotationX The degrees of X rotation. 8744 * 8745 * @see #getRotationX() 8746 * @see #getPivotX() 8747 * @see #getPivotY() 8748 * @see #setRotation(float) 8749 * @see #setRotationY(float) 8750 * @see #setCameraDistance(float) 8751 * 8752 * @attr ref android.R.styleable#View_rotationX 8753 */ 8754 public void setRotationX(float rotationX) { 8755 ensureTransformationInfo(); 8756 final TransformationInfo info = mTransformationInfo; 8757 if (info.mRotationX != rotationX) { 8758 invalidateViewProperty(true, false); 8759 info.mRotationX = rotationX; 8760 info.mMatrixDirty = true; 8761 invalidateViewProperty(false, true); 8762 if (mDisplayList != null) { 8763 mDisplayList.setRotationX(rotationX); 8764 } 8765 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8766 // View was rejected last time it was drawn by its parent; this may have changed 8767 invalidateParentIfNeeded(); 8768 } 8769 } 8770 } 8771 8772 /** 8773 * The amount that the view is scaled in x around the pivot point, as a proportion of 8774 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8775 * 8776 * <p>By default, this is 1.0f. 8777 * 8778 * @see #getPivotX() 8779 * @see #getPivotY() 8780 * @return The scaling factor. 8781 */ 8782 @ViewDebug.ExportedProperty(category = "drawing") 8783 public float getScaleX() { 8784 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8785 } 8786 8787 /** 8788 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8789 * the view's unscaled width. A value of 1 means that no scaling is applied. 8790 * 8791 * @param scaleX The scaling factor. 8792 * @see #getPivotX() 8793 * @see #getPivotY() 8794 * 8795 * @attr ref android.R.styleable#View_scaleX 8796 */ 8797 public void setScaleX(float scaleX) { 8798 ensureTransformationInfo(); 8799 final TransformationInfo info = mTransformationInfo; 8800 if (info.mScaleX != scaleX) { 8801 invalidateViewProperty(true, false); 8802 info.mScaleX = scaleX; 8803 info.mMatrixDirty = true; 8804 invalidateViewProperty(false, true); 8805 if (mDisplayList != null) { 8806 mDisplayList.setScaleX(scaleX); 8807 } 8808 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8809 // View was rejected last time it was drawn by its parent; this may have changed 8810 invalidateParentIfNeeded(); 8811 } 8812 } 8813 } 8814 8815 /** 8816 * The amount that the view is scaled in y around the pivot point, as a proportion of 8817 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8818 * 8819 * <p>By default, this is 1.0f. 8820 * 8821 * @see #getPivotX() 8822 * @see #getPivotY() 8823 * @return The scaling factor. 8824 */ 8825 @ViewDebug.ExportedProperty(category = "drawing") 8826 public float getScaleY() { 8827 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8828 } 8829 8830 /** 8831 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8832 * the view's unscaled width. A value of 1 means that no scaling is applied. 8833 * 8834 * @param scaleY The scaling factor. 8835 * @see #getPivotX() 8836 * @see #getPivotY() 8837 * 8838 * @attr ref android.R.styleable#View_scaleY 8839 */ 8840 public void setScaleY(float scaleY) { 8841 ensureTransformationInfo(); 8842 final TransformationInfo info = mTransformationInfo; 8843 if (info.mScaleY != scaleY) { 8844 invalidateViewProperty(true, false); 8845 info.mScaleY = scaleY; 8846 info.mMatrixDirty = true; 8847 invalidateViewProperty(false, true); 8848 if (mDisplayList != null) { 8849 mDisplayList.setScaleY(scaleY); 8850 } 8851 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8852 // View was rejected last time it was drawn by its parent; this may have changed 8853 invalidateParentIfNeeded(); 8854 } 8855 } 8856 } 8857 8858 /** 8859 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8860 * and {@link #setScaleX(float) scaled}. 8861 * 8862 * @see #getRotation() 8863 * @see #getScaleX() 8864 * @see #getScaleY() 8865 * @see #getPivotY() 8866 * @return The x location of the pivot point. 8867 * 8868 * @attr ref android.R.styleable#View_transformPivotX 8869 */ 8870 @ViewDebug.ExportedProperty(category = "drawing") 8871 public float getPivotX() { 8872 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8873 } 8874 8875 /** 8876 * Sets the x location of the point around which the view is 8877 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8878 * By default, the pivot point is centered on the object. 8879 * Setting this property disables this behavior and causes the view to use only the 8880 * explicitly set pivotX and pivotY values. 8881 * 8882 * @param pivotX The x location of the pivot point. 8883 * @see #getRotation() 8884 * @see #getScaleX() 8885 * @see #getScaleY() 8886 * @see #getPivotY() 8887 * 8888 * @attr ref android.R.styleable#View_transformPivotX 8889 */ 8890 public void setPivotX(float pivotX) { 8891 ensureTransformationInfo(); 8892 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8893 final TransformationInfo info = mTransformationInfo; 8894 if (info.mPivotX != pivotX) { 8895 invalidateViewProperty(true, false); 8896 info.mPivotX = pivotX; 8897 info.mMatrixDirty = true; 8898 invalidateViewProperty(false, true); 8899 if (mDisplayList != null) { 8900 mDisplayList.setPivotX(pivotX); 8901 } 8902 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8903 // View was rejected last time it was drawn by its parent; this may have changed 8904 invalidateParentIfNeeded(); 8905 } 8906 } 8907 } 8908 8909 /** 8910 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8911 * and {@link #setScaleY(float) scaled}. 8912 * 8913 * @see #getRotation() 8914 * @see #getScaleX() 8915 * @see #getScaleY() 8916 * @see #getPivotY() 8917 * @return The y location of the pivot point. 8918 * 8919 * @attr ref android.R.styleable#View_transformPivotY 8920 */ 8921 @ViewDebug.ExportedProperty(category = "drawing") 8922 public float getPivotY() { 8923 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8924 } 8925 8926 /** 8927 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8928 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8929 * Setting this property disables this behavior and causes the view to use only the 8930 * explicitly set pivotX and pivotY values. 8931 * 8932 * @param pivotY The y location of the pivot point. 8933 * @see #getRotation() 8934 * @see #getScaleX() 8935 * @see #getScaleY() 8936 * @see #getPivotY() 8937 * 8938 * @attr ref android.R.styleable#View_transformPivotY 8939 */ 8940 public void setPivotY(float pivotY) { 8941 ensureTransformationInfo(); 8942 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8943 final TransformationInfo info = mTransformationInfo; 8944 if (info.mPivotY != pivotY) { 8945 invalidateViewProperty(true, false); 8946 info.mPivotY = pivotY; 8947 info.mMatrixDirty = true; 8948 invalidateViewProperty(false, true); 8949 if (mDisplayList != null) { 8950 mDisplayList.setPivotY(pivotY); 8951 } 8952 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8953 // View was rejected last time it was drawn by its parent; this may have changed 8954 invalidateParentIfNeeded(); 8955 } 8956 } 8957 } 8958 8959 /** 8960 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8961 * completely transparent and 1 means the view is completely opaque. 8962 * 8963 * <p>By default this is 1.0f. 8964 * @return The opacity of the view. 8965 */ 8966 @ViewDebug.ExportedProperty(category = "drawing") 8967 public float getAlpha() { 8968 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8969 } 8970 8971 /** 8972 * Returns whether this View has content which overlaps. This function, intended to be 8973 * overridden by specific View types, is an optimization when alpha is set on a view. If 8974 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8975 * and then composited it into place, which can be expensive. If the view has no overlapping 8976 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8977 * An example of overlapping rendering is a TextView with a background image, such as a 8978 * Button. An example of non-overlapping rendering is a TextView with no background, or 8979 * an ImageView with only the foreground image. The default implementation returns true; 8980 * subclasses should override if they have cases which can be optimized. 8981 * 8982 * @return true if the content in this view might overlap, false otherwise. 8983 */ 8984 public boolean hasOverlappingRendering() { 8985 return true; 8986 } 8987 8988 /** 8989 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8990 * completely transparent and 1 means the view is completely opaque.</p> 8991 * 8992 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8993 * responsible for applying the opacity itself. Otherwise, calling this method is 8994 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8995 * setting a hardware layer.</p> 8996 * 8997 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8998 * performance implications. It is generally best to use the alpha property sparingly and 8999 * transiently, as in the case of fading animations.</p> 9000 * 9001 * @param alpha The opacity of the view. 9002 * 9003 * @see #setLayerType(int, android.graphics.Paint) 9004 * 9005 * @attr ref android.R.styleable#View_alpha 9006 */ 9007 public void setAlpha(float alpha) { 9008 ensureTransformationInfo(); 9009 if (mTransformationInfo.mAlpha != alpha) { 9010 mTransformationInfo.mAlpha = alpha; 9011 if (onSetAlpha((int) (alpha * 255))) { 9012 mPrivateFlags |= ALPHA_SET; 9013 // subclass is handling alpha - don't optimize rendering cache invalidation 9014 invalidateParentCaches(); 9015 invalidate(true); 9016 } else { 9017 mPrivateFlags &= ~ALPHA_SET; 9018 invalidateViewProperty(true, false); 9019 if (mDisplayList != null) { 9020 mDisplayList.setAlpha(alpha); 9021 } 9022 } 9023 } 9024 } 9025 9026 /** 9027 * Faster version of setAlpha() which performs the same steps except there are 9028 * no calls to invalidate(). The caller of this function should perform proper invalidation 9029 * on the parent and this object. The return value indicates whether the subclass handles 9030 * alpha (the return value for onSetAlpha()). 9031 * 9032 * @param alpha The new value for the alpha property 9033 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9034 * the new value for the alpha property is different from the old value 9035 */ 9036 boolean setAlphaNoInvalidation(float alpha) { 9037 ensureTransformationInfo(); 9038 if (mTransformationInfo.mAlpha != alpha) { 9039 mTransformationInfo.mAlpha = alpha; 9040 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9041 if (subclassHandlesAlpha) { 9042 mPrivateFlags |= ALPHA_SET; 9043 return true; 9044 } else { 9045 mPrivateFlags &= ~ALPHA_SET; 9046 if (mDisplayList != null) { 9047 mDisplayList.setAlpha(alpha); 9048 } 9049 } 9050 } 9051 return false; 9052 } 9053 9054 /** 9055 * Top position of this view relative to its parent. 9056 * 9057 * @return The top of this view, in pixels. 9058 */ 9059 @ViewDebug.CapturedViewProperty 9060 public final int getTop() { 9061 return mTop; 9062 } 9063 9064 /** 9065 * Sets the top position of this view relative to its parent. This method is meant to be called 9066 * by the layout system and should not generally be called otherwise, because the property 9067 * may be changed at any time by the layout. 9068 * 9069 * @param top The top of this view, in pixels. 9070 */ 9071 public final void setTop(int top) { 9072 if (top != mTop) { 9073 updateMatrix(); 9074 final boolean matrixIsIdentity = mTransformationInfo == null 9075 || mTransformationInfo.mMatrixIsIdentity; 9076 if (matrixIsIdentity) { 9077 if (mAttachInfo != null) { 9078 int minTop; 9079 int yLoc; 9080 if (top < mTop) { 9081 minTop = top; 9082 yLoc = top - mTop; 9083 } else { 9084 minTop = mTop; 9085 yLoc = 0; 9086 } 9087 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9088 } 9089 } else { 9090 // Double-invalidation is necessary to capture view's old and new areas 9091 invalidate(true); 9092 } 9093 9094 int width = mRight - mLeft; 9095 int oldHeight = mBottom - mTop; 9096 9097 mTop = top; 9098 if (mDisplayList != null) { 9099 mDisplayList.setTop(mTop); 9100 } 9101 9102 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9103 9104 if (!matrixIsIdentity) { 9105 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9106 // A change in dimension means an auto-centered pivot point changes, too 9107 mTransformationInfo.mMatrixDirty = true; 9108 } 9109 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9110 invalidate(true); 9111 } 9112 mBackgroundSizeChanged = true; 9113 invalidateParentIfNeeded(); 9114 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9115 // View was rejected last time it was drawn by its parent; this may have changed 9116 invalidateParentIfNeeded(); 9117 } 9118 } 9119 } 9120 9121 /** 9122 * Bottom position of this view relative to its parent. 9123 * 9124 * @return The bottom of this view, in pixels. 9125 */ 9126 @ViewDebug.CapturedViewProperty 9127 public final int getBottom() { 9128 return mBottom; 9129 } 9130 9131 /** 9132 * True if this view has changed since the last time being drawn. 9133 * 9134 * @return The dirty state of this view. 9135 */ 9136 public boolean isDirty() { 9137 return (mPrivateFlags & DIRTY_MASK) != 0; 9138 } 9139 9140 /** 9141 * Sets the bottom position of this view relative to its parent. This method is meant to be 9142 * called by the layout system and should not generally be called otherwise, because the 9143 * property may be changed at any time by the layout. 9144 * 9145 * @param bottom The bottom of this view, in pixels. 9146 */ 9147 public final void setBottom(int bottom) { 9148 if (bottom != mBottom) { 9149 updateMatrix(); 9150 final boolean matrixIsIdentity = mTransformationInfo == null 9151 || mTransformationInfo.mMatrixIsIdentity; 9152 if (matrixIsIdentity) { 9153 if (mAttachInfo != null) { 9154 int maxBottom; 9155 if (bottom < mBottom) { 9156 maxBottom = mBottom; 9157 } else { 9158 maxBottom = bottom; 9159 } 9160 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9161 } 9162 } else { 9163 // Double-invalidation is necessary to capture view's old and new areas 9164 invalidate(true); 9165 } 9166 9167 int width = mRight - mLeft; 9168 int oldHeight = mBottom - mTop; 9169 9170 mBottom = bottom; 9171 if (mDisplayList != null) { 9172 mDisplayList.setBottom(mBottom); 9173 } 9174 9175 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9176 9177 if (!matrixIsIdentity) { 9178 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9179 // A change in dimension means an auto-centered pivot point changes, too 9180 mTransformationInfo.mMatrixDirty = true; 9181 } 9182 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9183 invalidate(true); 9184 } 9185 mBackgroundSizeChanged = true; 9186 invalidateParentIfNeeded(); 9187 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9188 // View was rejected last time it was drawn by its parent; this may have changed 9189 invalidateParentIfNeeded(); 9190 } 9191 } 9192 } 9193 9194 /** 9195 * Left position of this view relative to its parent. 9196 * 9197 * @return The left edge of this view, in pixels. 9198 */ 9199 @ViewDebug.CapturedViewProperty 9200 public final int getLeft() { 9201 return mLeft; 9202 } 9203 9204 /** 9205 * Sets the left position of this view relative to its parent. This method is meant to be called 9206 * by the layout system and should not generally be called otherwise, because the property 9207 * may be changed at any time by the layout. 9208 * 9209 * @param left The bottom of this view, in pixels. 9210 */ 9211 public final void setLeft(int left) { 9212 if (left != mLeft) { 9213 updateMatrix(); 9214 final boolean matrixIsIdentity = mTransformationInfo == null 9215 || mTransformationInfo.mMatrixIsIdentity; 9216 if (matrixIsIdentity) { 9217 if (mAttachInfo != null) { 9218 int minLeft; 9219 int xLoc; 9220 if (left < mLeft) { 9221 minLeft = left; 9222 xLoc = left - mLeft; 9223 } else { 9224 minLeft = mLeft; 9225 xLoc = 0; 9226 } 9227 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9228 } 9229 } else { 9230 // Double-invalidation is necessary to capture view's old and new areas 9231 invalidate(true); 9232 } 9233 9234 int oldWidth = mRight - mLeft; 9235 int height = mBottom - mTop; 9236 9237 mLeft = left; 9238 if (mDisplayList != null) { 9239 mDisplayList.setLeft(left); 9240 } 9241 9242 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9243 9244 if (!matrixIsIdentity) { 9245 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9246 // A change in dimension means an auto-centered pivot point changes, too 9247 mTransformationInfo.mMatrixDirty = true; 9248 } 9249 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9250 invalidate(true); 9251 } 9252 mBackgroundSizeChanged = true; 9253 invalidateParentIfNeeded(); 9254 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9255 // View was rejected last time it was drawn by its parent; this may have changed 9256 invalidateParentIfNeeded(); 9257 } 9258 } 9259 } 9260 9261 /** 9262 * Right position of this view relative to its parent. 9263 * 9264 * @return The right edge of this view, in pixels. 9265 */ 9266 @ViewDebug.CapturedViewProperty 9267 public final int getRight() { 9268 return mRight; 9269 } 9270 9271 /** 9272 * Sets the right position of this view relative to its parent. This method is meant to be called 9273 * by the layout system and should not generally be called otherwise, because the property 9274 * may be changed at any time by the layout. 9275 * 9276 * @param right The bottom of this view, in pixels. 9277 */ 9278 public final void setRight(int right) { 9279 if (right != mRight) { 9280 updateMatrix(); 9281 final boolean matrixIsIdentity = mTransformationInfo == null 9282 || mTransformationInfo.mMatrixIsIdentity; 9283 if (matrixIsIdentity) { 9284 if (mAttachInfo != null) { 9285 int maxRight; 9286 if (right < mRight) { 9287 maxRight = mRight; 9288 } else { 9289 maxRight = right; 9290 } 9291 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9292 } 9293 } else { 9294 // Double-invalidation is necessary to capture view's old and new areas 9295 invalidate(true); 9296 } 9297 9298 int oldWidth = mRight - mLeft; 9299 int height = mBottom - mTop; 9300 9301 mRight = right; 9302 if (mDisplayList != null) { 9303 mDisplayList.setRight(mRight); 9304 } 9305 9306 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9307 9308 if (!matrixIsIdentity) { 9309 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9310 // A change in dimension means an auto-centered pivot point changes, too 9311 mTransformationInfo.mMatrixDirty = true; 9312 } 9313 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9314 invalidate(true); 9315 } 9316 mBackgroundSizeChanged = true; 9317 invalidateParentIfNeeded(); 9318 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9319 // View was rejected last time it was drawn by its parent; this may have changed 9320 invalidateParentIfNeeded(); 9321 } 9322 } 9323 } 9324 9325 /** 9326 * The visual x position of this view, in pixels. This is equivalent to the 9327 * {@link #setTranslationX(float) translationX} property plus the current 9328 * {@link #getLeft() left} property. 9329 * 9330 * @return The visual x position of this view, in pixels. 9331 */ 9332 @ViewDebug.ExportedProperty(category = "drawing") 9333 public float getX() { 9334 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9335 } 9336 9337 /** 9338 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9339 * {@link #setTranslationX(float) translationX} property to be the difference between 9340 * the x value passed in and the current {@link #getLeft() left} property. 9341 * 9342 * @param x The visual x position of this view, in pixels. 9343 */ 9344 public void setX(float x) { 9345 setTranslationX(x - mLeft); 9346 } 9347 9348 /** 9349 * The visual y position of this view, in pixels. This is equivalent to the 9350 * {@link #setTranslationY(float) translationY} property plus the current 9351 * {@link #getTop() top} property. 9352 * 9353 * @return The visual y position of this view, in pixels. 9354 */ 9355 @ViewDebug.ExportedProperty(category = "drawing") 9356 public float getY() { 9357 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9358 } 9359 9360 /** 9361 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9362 * {@link #setTranslationY(float) translationY} property to be the difference between 9363 * the y value passed in and the current {@link #getTop() top} property. 9364 * 9365 * @param y The visual y position of this view, in pixels. 9366 */ 9367 public void setY(float y) { 9368 setTranslationY(y - mTop); 9369 } 9370 9371 9372 /** 9373 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9374 * This position is post-layout, in addition to wherever the object's 9375 * layout placed it. 9376 * 9377 * @return The horizontal position of this view relative to its left position, in pixels. 9378 */ 9379 @ViewDebug.ExportedProperty(category = "drawing") 9380 public float getTranslationX() { 9381 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9382 } 9383 9384 /** 9385 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9386 * This effectively positions the object post-layout, in addition to wherever the object's 9387 * layout placed it. 9388 * 9389 * @param translationX The horizontal position of this view relative to its left position, 9390 * in pixels. 9391 * 9392 * @attr ref android.R.styleable#View_translationX 9393 */ 9394 public void setTranslationX(float translationX) { 9395 ensureTransformationInfo(); 9396 final TransformationInfo info = mTransformationInfo; 9397 if (info.mTranslationX != translationX) { 9398 // Double-invalidation is necessary to capture view's old and new areas 9399 invalidateViewProperty(true, false); 9400 info.mTranslationX = translationX; 9401 info.mMatrixDirty = true; 9402 invalidateViewProperty(false, true); 9403 if (mDisplayList != null) { 9404 mDisplayList.setTranslationX(translationX); 9405 } 9406 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9407 // View was rejected last time it was drawn by its parent; this may have changed 9408 invalidateParentIfNeeded(); 9409 } 9410 } 9411 } 9412 9413 /** 9414 * The horizontal location of this view relative to its {@link #getTop() top} position. 9415 * This position is post-layout, in addition to wherever the object's 9416 * layout placed it. 9417 * 9418 * @return The vertical position of this view relative to its top position, 9419 * in pixels. 9420 */ 9421 @ViewDebug.ExportedProperty(category = "drawing") 9422 public float getTranslationY() { 9423 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9424 } 9425 9426 /** 9427 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9428 * This effectively positions the object post-layout, in addition to wherever the object's 9429 * layout placed it. 9430 * 9431 * @param translationY The vertical position of this view relative to its top position, 9432 * in pixels. 9433 * 9434 * @attr ref android.R.styleable#View_translationY 9435 */ 9436 public void setTranslationY(float translationY) { 9437 ensureTransformationInfo(); 9438 final TransformationInfo info = mTransformationInfo; 9439 if (info.mTranslationY != translationY) { 9440 invalidateViewProperty(true, false); 9441 info.mTranslationY = translationY; 9442 info.mMatrixDirty = true; 9443 invalidateViewProperty(false, true); 9444 if (mDisplayList != null) { 9445 mDisplayList.setTranslationY(translationY); 9446 } 9447 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9448 // View was rejected last time it was drawn by its parent; this may have changed 9449 invalidateParentIfNeeded(); 9450 } 9451 } 9452 } 9453 9454 /** 9455 * Hit rectangle in parent's coordinates 9456 * 9457 * @param outRect The hit rectangle of the view. 9458 */ 9459 public void getHitRect(Rect outRect) { 9460 updateMatrix(); 9461 final TransformationInfo info = mTransformationInfo; 9462 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9463 outRect.set(mLeft, mTop, mRight, mBottom); 9464 } else { 9465 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9466 tmpRect.set(-info.mPivotX, -info.mPivotY, 9467 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9468 info.mMatrix.mapRect(tmpRect); 9469 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9470 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9471 } 9472 } 9473 9474 /** 9475 * Determines whether the given point, in local coordinates is inside the view. 9476 */ 9477 /*package*/ final boolean pointInView(float localX, float localY) { 9478 return localX >= 0 && localX < (mRight - mLeft) 9479 && localY >= 0 && localY < (mBottom - mTop); 9480 } 9481 9482 /** 9483 * Utility method to determine whether the given point, in local coordinates, 9484 * is inside the view, where the area of the view is expanded by the slop factor. 9485 * This method is called while processing touch-move events to determine if the event 9486 * is still within the view. 9487 */ 9488 private boolean pointInView(float localX, float localY, float slop) { 9489 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9490 localY < ((mBottom - mTop) + slop); 9491 } 9492 9493 /** 9494 * When a view has focus and the user navigates away from it, the next view is searched for 9495 * starting from the rectangle filled in by this method. 9496 * 9497 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9498 * of the view. However, if your view maintains some idea of internal selection, 9499 * such as a cursor, or a selected row or column, you should override this method and 9500 * fill in a more specific rectangle. 9501 * 9502 * @param r The rectangle to fill in, in this view's coordinates. 9503 */ 9504 public void getFocusedRect(Rect r) { 9505 getDrawingRect(r); 9506 } 9507 9508 /** 9509 * If some part of this view is not clipped by any of its parents, then 9510 * return that area in r in global (root) coordinates. To convert r to local 9511 * coordinates (without taking possible View rotations into account), offset 9512 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9513 * If the view is completely clipped or translated out, return false. 9514 * 9515 * @param r If true is returned, r holds the global coordinates of the 9516 * visible portion of this view. 9517 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9518 * between this view and its root. globalOffet may be null. 9519 * @return true if r is non-empty (i.e. part of the view is visible at the 9520 * root level. 9521 */ 9522 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9523 int width = mRight - mLeft; 9524 int height = mBottom - mTop; 9525 if (width > 0 && height > 0) { 9526 r.set(0, 0, width, height); 9527 if (globalOffset != null) { 9528 globalOffset.set(-mScrollX, -mScrollY); 9529 } 9530 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9531 } 9532 return false; 9533 } 9534 9535 public final boolean getGlobalVisibleRect(Rect r) { 9536 return getGlobalVisibleRect(r, null); 9537 } 9538 9539 public final boolean getLocalVisibleRect(Rect r) { 9540 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9541 if (getGlobalVisibleRect(r, offset)) { 9542 r.offset(-offset.x, -offset.y); // make r local 9543 return true; 9544 } 9545 return false; 9546 } 9547 9548 /** 9549 * Offset this view's vertical location by the specified number of pixels. 9550 * 9551 * @param offset the number of pixels to offset the view by 9552 */ 9553 public void offsetTopAndBottom(int offset) { 9554 if (offset != 0) { 9555 updateMatrix(); 9556 final boolean matrixIsIdentity = mTransformationInfo == null 9557 || mTransformationInfo.mMatrixIsIdentity; 9558 if (matrixIsIdentity) { 9559 if (mDisplayList != null) { 9560 invalidateViewProperty(false, false); 9561 } else { 9562 final ViewParent p = mParent; 9563 if (p != null && mAttachInfo != null) { 9564 final Rect r = mAttachInfo.mTmpInvalRect; 9565 int minTop; 9566 int maxBottom; 9567 int yLoc; 9568 if (offset < 0) { 9569 minTop = mTop + offset; 9570 maxBottom = mBottom; 9571 yLoc = offset; 9572 } else { 9573 minTop = mTop; 9574 maxBottom = mBottom + offset; 9575 yLoc = 0; 9576 } 9577 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9578 p.invalidateChild(this, r); 9579 } 9580 } 9581 } else { 9582 invalidateViewProperty(false, false); 9583 } 9584 9585 mTop += offset; 9586 mBottom += offset; 9587 if (mDisplayList != null) { 9588 mDisplayList.offsetTopBottom(offset); 9589 invalidateViewProperty(false, false); 9590 } else { 9591 if (!matrixIsIdentity) { 9592 invalidateViewProperty(false, true); 9593 } 9594 invalidateParentIfNeeded(); 9595 } 9596 } 9597 } 9598 9599 /** 9600 * Offset this view's horizontal location by the specified amount of pixels. 9601 * 9602 * @param offset the numer of pixels to offset the view by 9603 */ 9604 public void offsetLeftAndRight(int offset) { 9605 if (offset != 0) { 9606 updateMatrix(); 9607 final boolean matrixIsIdentity = mTransformationInfo == null 9608 || mTransformationInfo.mMatrixIsIdentity; 9609 if (matrixIsIdentity) { 9610 if (mDisplayList != null) { 9611 invalidateViewProperty(false, false); 9612 } else { 9613 final ViewParent p = mParent; 9614 if (p != null && mAttachInfo != null) { 9615 final Rect r = mAttachInfo.mTmpInvalRect; 9616 int minLeft; 9617 int maxRight; 9618 if (offset < 0) { 9619 minLeft = mLeft + offset; 9620 maxRight = mRight; 9621 } else { 9622 minLeft = mLeft; 9623 maxRight = mRight + offset; 9624 } 9625 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9626 p.invalidateChild(this, r); 9627 } 9628 } 9629 } else { 9630 invalidateViewProperty(false, false); 9631 } 9632 9633 mLeft += offset; 9634 mRight += offset; 9635 if (mDisplayList != null) { 9636 mDisplayList.offsetLeftRight(offset); 9637 invalidateViewProperty(false, false); 9638 } else { 9639 if (!matrixIsIdentity) { 9640 invalidateViewProperty(false, true); 9641 } 9642 invalidateParentIfNeeded(); 9643 } 9644 } 9645 } 9646 9647 /** 9648 * Get the LayoutParams associated with this view. All views should have 9649 * layout parameters. These supply parameters to the <i>parent</i> of this 9650 * view specifying how it should be arranged. There are many subclasses of 9651 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9652 * of ViewGroup that are responsible for arranging their children. 9653 * 9654 * This method may return null if this View is not attached to a parent 9655 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9656 * was not invoked successfully. When a View is attached to a parent 9657 * ViewGroup, this method must not return null. 9658 * 9659 * @return The LayoutParams associated with this view, or null if no 9660 * parameters have been set yet 9661 */ 9662 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9663 public ViewGroup.LayoutParams getLayoutParams() { 9664 return mLayoutParams; 9665 } 9666 9667 /** 9668 * Set the layout parameters associated with this view. These supply 9669 * parameters to the <i>parent</i> of this view specifying how it should be 9670 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9671 * correspond to the different subclasses of ViewGroup that are responsible 9672 * for arranging their children. 9673 * 9674 * @param params The layout parameters for this view, cannot be null 9675 */ 9676 public void setLayoutParams(ViewGroup.LayoutParams params) { 9677 if (params == null) { 9678 throw new NullPointerException("Layout parameters cannot be null"); 9679 } 9680 mLayoutParams = params; 9681 if (mParent instanceof ViewGroup) { 9682 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9683 } 9684 requestLayout(); 9685 } 9686 9687 /** 9688 * Set the scrolled position of your view. This will cause a call to 9689 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9690 * invalidated. 9691 * @param x the x position to scroll to 9692 * @param y the y position to scroll to 9693 */ 9694 public void scrollTo(int x, int y) { 9695 if (mScrollX != x || mScrollY != y) { 9696 int oldX = mScrollX; 9697 int oldY = mScrollY; 9698 mScrollX = x; 9699 mScrollY = y; 9700 invalidateParentCaches(); 9701 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9702 if (!awakenScrollBars()) { 9703 postInvalidateOnAnimation(); 9704 } 9705 } 9706 } 9707 9708 /** 9709 * Move the scrolled position of your view. This will cause a call to 9710 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9711 * invalidated. 9712 * @param x the amount of pixels to scroll by horizontally 9713 * @param y the amount of pixels to scroll by vertically 9714 */ 9715 public void scrollBy(int x, int y) { 9716 scrollTo(mScrollX + x, mScrollY + y); 9717 } 9718 9719 /** 9720 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9721 * animation to fade the scrollbars out after a default delay. If a subclass 9722 * provides animated scrolling, the start delay should equal the duration 9723 * of the scrolling animation.</p> 9724 * 9725 * <p>The animation starts only if at least one of the scrollbars is 9726 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9727 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9728 * this method returns true, and false otherwise. If the animation is 9729 * started, this method calls {@link #invalidate()}; in that case the 9730 * caller should not call {@link #invalidate()}.</p> 9731 * 9732 * <p>This method should be invoked every time a subclass directly updates 9733 * the scroll parameters.</p> 9734 * 9735 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9736 * and {@link #scrollTo(int, int)}.</p> 9737 * 9738 * @return true if the animation is played, false otherwise 9739 * 9740 * @see #awakenScrollBars(int) 9741 * @see #scrollBy(int, int) 9742 * @see #scrollTo(int, int) 9743 * @see #isHorizontalScrollBarEnabled() 9744 * @see #isVerticalScrollBarEnabled() 9745 * @see #setHorizontalScrollBarEnabled(boolean) 9746 * @see #setVerticalScrollBarEnabled(boolean) 9747 */ 9748 protected boolean awakenScrollBars() { 9749 return mScrollCache != null && 9750 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9751 } 9752 9753 /** 9754 * Trigger the scrollbars to draw. 9755 * This method differs from awakenScrollBars() only in its default duration. 9756 * initialAwakenScrollBars() will show the scroll bars for longer than 9757 * usual to give the user more of a chance to notice them. 9758 * 9759 * @return true if the animation is played, false otherwise. 9760 */ 9761 private boolean initialAwakenScrollBars() { 9762 return mScrollCache != null && 9763 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9764 } 9765 9766 /** 9767 * <p> 9768 * Trigger the scrollbars to draw. When invoked this method starts an 9769 * animation to fade the scrollbars out after a fixed delay. If a subclass 9770 * provides animated scrolling, the start delay should equal the duration of 9771 * the scrolling animation. 9772 * </p> 9773 * 9774 * <p> 9775 * The animation starts only if at least one of the scrollbars is enabled, 9776 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9777 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9778 * this method returns true, and false otherwise. If the animation is 9779 * started, this method calls {@link #invalidate()}; in that case the caller 9780 * should not call {@link #invalidate()}. 9781 * </p> 9782 * 9783 * <p> 9784 * This method should be invoked everytime a subclass directly updates the 9785 * scroll parameters. 9786 * </p> 9787 * 9788 * @param startDelay the delay, in milliseconds, after which the animation 9789 * should start; when the delay is 0, the animation starts 9790 * immediately 9791 * @return true if the animation is played, false otherwise 9792 * 9793 * @see #scrollBy(int, int) 9794 * @see #scrollTo(int, int) 9795 * @see #isHorizontalScrollBarEnabled() 9796 * @see #isVerticalScrollBarEnabled() 9797 * @see #setHorizontalScrollBarEnabled(boolean) 9798 * @see #setVerticalScrollBarEnabled(boolean) 9799 */ 9800 protected boolean awakenScrollBars(int startDelay) { 9801 return awakenScrollBars(startDelay, true); 9802 } 9803 9804 /** 9805 * <p> 9806 * Trigger the scrollbars to draw. When invoked this method starts an 9807 * animation to fade the scrollbars out after a fixed delay. If a subclass 9808 * provides animated scrolling, the start delay should equal the duration of 9809 * the scrolling animation. 9810 * </p> 9811 * 9812 * <p> 9813 * The animation starts only if at least one of the scrollbars is enabled, 9814 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9815 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9816 * this method returns true, and false otherwise. If the animation is 9817 * started, this method calls {@link #invalidate()} if the invalidate parameter 9818 * is set to true; in that case the caller 9819 * should not call {@link #invalidate()}. 9820 * </p> 9821 * 9822 * <p> 9823 * This method should be invoked everytime a subclass directly updates the 9824 * scroll parameters. 9825 * </p> 9826 * 9827 * @param startDelay the delay, in milliseconds, after which the animation 9828 * should start; when the delay is 0, the animation starts 9829 * immediately 9830 * 9831 * @param invalidate Wheter this method should call invalidate 9832 * 9833 * @return true if the animation is played, false otherwise 9834 * 9835 * @see #scrollBy(int, int) 9836 * @see #scrollTo(int, int) 9837 * @see #isHorizontalScrollBarEnabled() 9838 * @see #isVerticalScrollBarEnabled() 9839 * @see #setHorizontalScrollBarEnabled(boolean) 9840 * @see #setVerticalScrollBarEnabled(boolean) 9841 */ 9842 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9843 final ScrollabilityCache scrollCache = mScrollCache; 9844 9845 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9846 return false; 9847 } 9848 9849 if (scrollCache.scrollBar == null) { 9850 scrollCache.scrollBar = new ScrollBarDrawable(); 9851 } 9852 9853 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9854 9855 if (invalidate) { 9856 // Invalidate to show the scrollbars 9857 postInvalidateOnAnimation(); 9858 } 9859 9860 if (scrollCache.state == ScrollabilityCache.OFF) { 9861 // FIXME: this is copied from WindowManagerService. 9862 // We should get this value from the system when it 9863 // is possible to do so. 9864 final int KEY_REPEAT_FIRST_DELAY = 750; 9865 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9866 } 9867 9868 // Tell mScrollCache when we should start fading. This may 9869 // extend the fade start time if one was already scheduled 9870 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9871 scrollCache.fadeStartTime = fadeStartTime; 9872 scrollCache.state = ScrollabilityCache.ON; 9873 9874 // Schedule our fader to run, unscheduling any old ones first 9875 if (mAttachInfo != null) { 9876 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9877 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9878 } 9879 9880 return true; 9881 } 9882 9883 return false; 9884 } 9885 9886 /** 9887 * Do not invalidate views which are not visible and which are not running an animation. They 9888 * will not get drawn and they should not set dirty flags as if they will be drawn 9889 */ 9890 private boolean skipInvalidate() { 9891 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9892 (!(mParent instanceof ViewGroup) || 9893 !((ViewGroup) mParent).isViewTransitioning(this)); 9894 } 9895 /** 9896 * Mark the area defined by dirty as needing to be drawn. If the view is 9897 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9898 * in the future. This must be called from a UI thread. To call from a non-UI 9899 * thread, call {@link #postInvalidate()}. 9900 * 9901 * WARNING: This method is destructive to dirty. 9902 * @param dirty the rectangle representing the bounds of the dirty region 9903 */ 9904 public void invalidate(Rect dirty) { 9905 if (skipInvalidate()) { 9906 return; 9907 } 9908 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9909 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9910 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9911 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9912 mPrivateFlags |= INVALIDATED; 9913 mPrivateFlags |= DIRTY; 9914 final ViewParent p = mParent; 9915 final AttachInfo ai = mAttachInfo; 9916 //noinspection PointlessBooleanExpression,ConstantConditions 9917 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9918 if (p != null && ai != null && ai.mHardwareAccelerated) { 9919 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9920 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9921 p.invalidateChild(this, null); 9922 return; 9923 } 9924 } 9925 if (p != null && ai != null) { 9926 final int scrollX = mScrollX; 9927 final int scrollY = mScrollY; 9928 final Rect r = ai.mTmpInvalRect; 9929 r.set(dirty.left - scrollX, dirty.top - scrollY, 9930 dirty.right - scrollX, dirty.bottom - scrollY); 9931 mParent.invalidateChild(this, r); 9932 } 9933 } 9934 } 9935 9936 /** 9937 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9938 * The coordinates of the dirty rect are relative to the view. 9939 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9940 * will be called at some point in the future. This must be called from 9941 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9942 * @param l the left position of the dirty region 9943 * @param t the top position of the dirty region 9944 * @param r the right position of the dirty region 9945 * @param b the bottom position of the dirty region 9946 */ 9947 public void invalidate(int l, int t, int r, int b) { 9948 if (skipInvalidate()) { 9949 return; 9950 } 9951 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9952 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9953 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9954 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9955 mPrivateFlags |= INVALIDATED; 9956 mPrivateFlags |= DIRTY; 9957 final ViewParent p = mParent; 9958 final AttachInfo ai = mAttachInfo; 9959 //noinspection PointlessBooleanExpression,ConstantConditions 9960 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9961 if (p != null && ai != null && ai.mHardwareAccelerated) { 9962 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9963 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9964 p.invalidateChild(this, null); 9965 return; 9966 } 9967 } 9968 if (p != null && ai != null && l < r && t < b) { 9969 final int scrollX = mScrollX; 9970 final int scrollY = mScrollY; 9971 final Rect tmpr = ai.mTmpInvalRect; 9972 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9973 p.invalidateChild(this, tmpr); 9974 } 9975 } 9976 } 9977 9978 /** 9979 * Invalidate the whole view. If the view is visible, 9980 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9981 * the future. This must be called from a UI thread. To call from a non-UI thread, 9982 * call {@link #postInvalidate()}. 9983 */ 9984 public void invalidate() { 9985 invalidate(true); 9986 } 9987 9988 /** 9989 * This is where the invalidate() work actually happens. A full invalidate() 9990 * causes the drawing cache to be invalidated, but this function can be called with 9991 * invalidateCache set to false to skip that invalidation step for cases that do not 9992 * need it (for example, a component that remains at the same dimensions with the same 9993 * content). 9994 * 9995 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9996 * well. This is usually true for a full invalidate, but may be set to false if the 9997 * View's contents or dimensions have not changed. 9998 */ 9999 void invalidate(boolean invalidateCache) { 10000 if (skipInvalidate()) { 10001 return; 10002 } 10003 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 10004 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 10005 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 10006 mLastIsOpaque = isOpaque(); 10007 mPrivateFlags &= ~DRAWN; 10008 mPrivateFlags |= DIRTY; 10009 if (invalidateCache) { 10010 mPrivateFlags |= INVALIDATED; 10011 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10012 } 10013 final AttachInfo ai = mAttachInfo; 10014 final ViewParent p = mParent; 10015 //noinspection PointlessBooleanExpression,ConstantConditions 10016 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10017 if (p != null && ai != null && ai.mHardwareAccelerated) { 10018 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10019 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10020 p.invalidateChild(this, null); 10021 return; 10022 } 10023 } 10024 10025 if (p != null && ai != null) { 10026 final Rect r = ai.mTmpInvalRect; 10027 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10028 // Don't call invalidate -- we don't want to internally scroll 10029 // our own bounds 10030 p.invalidateChild(this, r); 10031 } 10032 } 10033 } 10034 10035 /** 10036 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10037 * set any flags or handle all of the cases handled by the default invalidation methods. 10038 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10039 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10040 * walk up the hierarchy, transforming the dirty rect as necessary. 10041 * 10042 * The method also handles normal invalidation logic if display list properties are not 10043 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10044 * backup approach, to handle these cases used in the various property-setting methods. 10045 * 10046 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10047 * are not being used in this view 10048 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10049 * list properties are not being used in this view 10050 */ 10051 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10052 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 10053 if (invalidateParent) { 10054 invalidateParentCaches(); 10055 } 10056 if (forceRedraw) { 10057 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 10058 } 10059 invalidate(false); 10060 } else { 10061 final AttachInfo ai = mAttachInfo; 10062 final ViewParent p = mParent; 10063 if (p != null && ai != null) { 10064 final Rect r = ai.mTmpInvalRect; 10065 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10066 if (mParent instanceof ViewGroup) { 10067 ((ViewGroup) mParent).invalidateChildFast(this, r); 10068 } else { 10069 mParent.invalidateChild(this, r); 10070 } 10071 } 10072 } 10073 } 10074 10075 /** 10076 * Utility method to transform a given Rect by the current matrix of this view. 10077 */ 10078 void transformRect(final Rect rect) { 10079 if (!getMatrix().isIdentity()) { 10080 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10081 boundingRect.set(rect); 10082 getMatrix().mapRect(boundingRect); 10083 rect.set((int) (boundingRect.left - 0.5f), 10084 (int) (boundingRect.top - 0.5f), 10085 (int) (boundingRect.right + 0.5f), 10086 (int) (boundingRect.bottom + 0.5f)); 10087 } 10088 } 10089 10090 /** 10091 * Used to indicate that the parent of this view should clear its caches. This functionality 10092 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10093 * which is necessary when various parent-managed properties of the view change, such as 10094 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10095 * clears the parent caches and does not causes an invalidate event. 10096 * 10097 * @hide 10098 */ 10099 protected void invalidateParentCaches() { 10100 if (mParent instanceof View) { 10101 ((View) mParent).mPrivateFlags |= INVALIDATED; 10102 } 10103 } 10104 10105 /** 10106 * Used to indicate that the parent of this view should be invalidated. This functionality 10107 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10108 * which is necessary when various parent-managed properties of the view change, such as 10109 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10110 * an invalidation event to the parent. 10111 * 10112 * @hide 10113 */ 10114 protected void invalidateParentIfNeeded() { 10115 if (isHardwareAccelerated() && mParent instanceof View) { 10116 ((View) mParent).invalidate(true); 10117 } 10118 } 10119 10120 /** 10121 * Indicates whether this View is opaque. An opaque View guarantees that it will 10122 * draw all the pixels overlapping its bounds using a fully opaque color. 10123 * 10124 * Subclasses of View should override this method whenever possible to indicate 10125 * whether an instance is opaque. Opaque Views are treated in a special way by 10126 * the View hierarchy, possibly allowing it to perform optimizations during 10127 * invalidate/draw passes. 10128 * 10129 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10130 */ 10131 @ViewDebug.ExportedProperty(category = "drawing") 10132 public boolean isOpaque() { 10133 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 10134 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 10135 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 10136 } 10137 10138 /** 10139 * @hide 10140 */ 10141 protected void computeOpaqueFlags() { 10142 // Opaque if: 10143 // - Has a background 10144 // - Background is opaque 10145 // - Doesn't have scrollbars or scrollbars are inside overlay 10146 10147 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10148 mPrivateFlags |= OPAQUE_BACKGROUND; 10149 } else { 10150 mPrivateFlags &= ~OPAQUE_BACKGROUND; 10151 } 10152 10153 final int flags = mViewFlags; 10154 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10155 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10156 mPrivateFlags |= OPAQUE_SCROLLBARS; 10157 } else { 10158 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 10159 } 10160 } 10161 10162 /** 10163 * @hide 10164 */ 10165 protected boolean hasOpaqueScrollbars() { 10166 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 10167 } 10168 10169 /** 10170 * @return A handler associated with the thread running the View. This 10171 * handler can be used to pump events in the UI events queue. 10172 */ 10173 public Handler getHandler() { 10174 if (mAttachInfo != null) { 10175 return mAttachInfo.mHandler; 10176 } 10177 return null; 10178 } 10179 10180 /** 10181 * Gets the view root associated with the View. 10182 * @return The view root, or null if none. 10183 * @hide 10184 */ 10185 public ViewRootImpl getViewRootImpl() { 10186 if (mAttachInfo != null) { 10187 return mAttachInfo.mViewRootImpl; 10188 } 10189 return null; 10190 } 10191 10192 /** 10193 * <p>Causes the Runnable to be added to the message queue. 10194 * The runnable will be run on the user interface thread.</p> 10195 * 10196 * <p>This method can be invoked from outside of the UI thread 10197 * only when this View is attached to a window.</p> 10198 * 10199 * @param action The Runnable that will be executed. 10200 * 10201 * @return Returns true if the Runnable was successfully placed in to the 10202 * message queue. Returns false on failure, usually because the 10203 * looper processing the message queue is exiting. 10204 * 10205 * @see #postDelayed 10206 * @see #removeCallbacks 10207 */ 10208 public boolean post(Runnable action) { 10209 final AttachInfo attachInfo = mAttachInfo; 10210 if (attachInfo != null) { 10211 return attachInfo.mHandler.post(action); 10212 } 10213 // Assume that post will succeed later 10214 ViewRootImpl.getRunQueue().post(action); 10215 return true; 10216 } 10217 10218 /** 10219 * <p>Causes the Runnable to be added to the message queue, to be run 10220 * after the specified amount of time elapses. 10221 * The runnable will be run on the user interface thread.</p> 10222 * 10223 * <p>This method can be invoked from outside of the UI thread 10224 * only when this View is attached to a window.</p> 10225 * 10226 * @param action The Runnable that will be executed. 10227 * @param delayMillis The delay (in milliseconds) until the Runnable 10228 * will be executed. 10229 * 10230 * @return true if the Runnable was successfully placed in to the 10231 * message queue. Returns false on failure, usually because the 10232 * looper processing the message queue is exiting. Note that a 10233 * result of true does not mean the Runnable will be processed -- 10234 * if the looper is quit before the delivery time of the message 10235 * occurs then the message will be dropped. 10236 * 10237 * @see #post 10238 * @see #removeCallbacks 10239 */ 10240 public boolean postDelayed(Runnable action, long delayMillis) { 10241 final AttachInfo attachInfo = mAttachInfo; 10242 if (attachInfo != null) { 10243 return attachInfo.mHandler.postDelayed(action, delayMillis); 10244 } 10245 // Assume that post will succeed later 10246 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10247 return true; 10248 } 10249 10250 /** 10251 * <p>Causes the Runnable to execute on the next animation time step. 10252 * The runnable will be run on the user interface thread.</p> 10253 * 10254 * <p>This method can be invoked from outside of the UI thread 10255 * only when this View is attached to a window.</p> 10256 * 10257 * @param action The Runnable that will be executed. 10258 * 10259 * @see #postOnAnimationDelayed 10260 * @see #removeCallbacks 10261 */ 10262 public void postOnAnimation(Runnable action) { 10263 final AttachInfo attachInfo = mAttachInfo; 10264 if (attachInfo != null) { 10265 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10266 Choreographer.CALLBACK_ANIMATION, action, null); 10267 } else { 10268 // Assume that post will succeed later 10269 ViewRootImpl.getRunQueue().post(action); 10270 } 10271 } 10272 10273 /** 10274 * <p>Causes the Runnable to execute on the next animation time step, 10275 * after the specified amount of time elapses. 10276 * The runnable will be run on the user interface thread.</p> 10277 * 10278 * <p>This method can be invoked from outside of the UI thread 10279 * only when this View is attached to a window.</p> 10280 * 10281 * @param action The Runnable that will be executed. 10282 * @param delayMillis The delay (in milliseconds) until the Runnable 10283 * will be executed. 10284 * 10285 * @see #postOnAnimation 10286 * @see #removeCallbacks 10287 */ 10288 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10289 final AttachInfo attachInfo = mAttachInfo; 10290 if (attachInfo != null) { 10291 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10292 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10293 } else { 10294 // Assume that post will succeed later 10295 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10296 } 10297 } 10298 10299 /** 10300 * <p>Removes the specified Runnable from the message queue.</p> 10301 * 10302 * <p>This method can be invoked from outside of the UI thread 10303 * only when this View is attached to a window.</p> 10304 * 10305 * @param action The Runnable to remove from the message handling queue 10306 * 10307 * @return true if this view could ask the Handler to remove the Runnable, 10308 * false otherwise. When the returned value is true, the Runnable 10309 * may or may not have been actually removed from the message queue 10310 * (for instance, if the Runnable was not in the queue already.) 10311 * 10312 * @see #post 10313 * @see #postDelayed 10314 * @see #postOnAnimation 10315 * @see #postOnAnimationDelayed 10316 */ 10317 public boolean removeCallbacks(Runnable action) { 10318 if (action != null) { 10319 final AttachInfo attachInfo = mAttachInfo; 10320 if (attachInfo != null) { 10321 attachInfo.mHandler.removeCallbacks(action); 10322 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10323 Choreographer.CALLBACK_ANIMATION, action, null); 10324 } else { 10325 // Assume that post will succeed later 10326 ViewRootImpl.getRunQueue().removeCallbacks(action); 10327 } 10328 } 10329 return true; 10330 } 10331 10332 /** 10333 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10334 * Use this to invalidate the View from a non-UI thread.</p> 10335 * 10336 * <p>This method can be invoked from outside of the UI thread 10337 * only when this View is attached to a window.</p> 10338 * 10339 * @see #invalidate() 10340 * @see #postInvalidateDelayed(long) 10341 */ 10342 public void postInvalidate() { 10343 postInvalidateDelayed(0); 10344 } 10345 10346 /** 10347 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10348 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10349 * 10350 * <p>This method can be invoked from outside of the UI thread 10351 * only when this View is attached to a window.</p> 10352 * 10353 * @param left The left coordinate of the rectangle to invalidate. 10354 * @param top The top coordinate of the rectangle to invalidate. 10355 * @param right The right coordinate of the rectangle to invalidate. 10356 * @param bottom The bottom coordinate of the rectangle to invalidate. 10357 * 10358 * @see #invalidate(int, int, int, int) 10359 * @see #invalidate(Rect) 10360 * @see #postInvalidateDelayed(long, int, int, int, int) 10361 */ 10362 public void postInvalidate(int left, int top, int right, int bottom) { 10363 postInvalidateDelayed(0, left, top, right, bottom); 10364 } 10365 10366 /** 10367 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10368 * loop. Waits for the specified amount of time.</p> 10369 * 10370 * <p>This method can be invoked from outside of the UI thread 10371 * only when this View is attached to a window.</p> 10372 * 10373 * @param delayMilliseconds the duration in milliseconds to delay the 10374 * invalidation by 10375 * 10376 * @see #invalidate() 10377 * @see #postInvalidate() 10378 */ 10379 public void postInvalidateDelayed(long delayMilliseconds) { 10380 // We try only with the AttachInfo because there's no point in invalidating 10381 // if we are not attached to our window 10382 final AttachInfo attachInfo = mAttachInfo; 10383 if (attachInfo != null) { 10384 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10385 } 10386 } 10387 10388 /** 10389 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10390 * through the event loop. Waits for the specified amount of time.</p> 10391 * 10392 * <p>This method can be invoked from outside of the UI thread 10393 * only when this View is attached to a window.</p> 10394 * 10395 * @param delayMilliseconds the duration in milliseconds to delay the 10396 * invalidation by 10397 * @param left The left coordinate of the rectangle to invalidate. 10398 * @param top The top coordinate of the rectangle to invalidate. 10399 * @param right The right coordinate of the rectangle to invalidate. 10400 * @param bottom The bottom coordinate of the rectangle to invalidate. 10401 * 10402 * @see #invalidate(int, int, int, int) 10403 * @see #invalidate(Rect) 10404 * @see #postInvalidate(int, int, int, int) 10405 */ 10406 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10407 int right, int bottom) { 10408 10409 // We try only with the AttachInfo because there's no point in invalidating 10410 // if we are not attached to our window 10411 final AttachInfo attachInfo = mAttachInfo; 10412 if (attachInfo != null) { 10413 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10414 info.target = this; 10415 info.left = left; 10416 info.top = top; 10417 info.right = right; 10418 info.bottom = bottom; 10419 10420 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10421 } 10422 } 10423 10424 /** 10425 * <p>Cause an invalidate to happen on the next animation time step, typically the 10426 * next display frame.</p> 10427 * 10428 * <p>This method can be invoked from outside of the UI thread 10429 * only when this View is attached to a window.</p> 10430 * 10431 * @see #invalidate() 10432 */ 10433 public void postInvalidateOnAnimation() { 10434 // We try only with the AttachInfo because there's no point in invalidating 10435 // if we are not attached to our window 10436 final AttachInfo attachInfo = mAttachInfo; 10437 if (attachInfo != null) { 10438 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10439 } 10440 } 10441 10442 /** 10443 * <p>Cause an invalidate of the specified area to happen on the next animation 10444 * time step, typically the next display frame.</p> 10445 * 10446 * <p>This method can be invoked from outside of the UI thread 10447 * only when this View is attached to a window.</p> 10448 * 10449 * @param left The left coordinate of the rectangle to invalidate. 10450 * @param top The top coordinate of the rectangle to invalidate. 10451 * @param right The right coordinate of the rectangle to invalidate. 10452 * @param bottom The bottom coordinate of the rectangle to invalidate. 10453 * 10454 * @see #invalidate(int, int, int, int) 10455 * @see #invalidate(Rect) 10456 */ 10457 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10458 // We try only with the AttachInfo because there's no point in invalidating 10459 // if we are not attached to our window 10460 final AttachInfo attachInfo = mAttachInfo; 10461 if (attachInfo != null) { 10462 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10463 info.target = this; 10464 info.left = left; 10465 info.top = top; 10466 info.right = right; 10467 info.bottom = bottom; 10468 10469 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10470 } 10471 } 10472 10473 /** 10474 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10475 * This event is sent at most once every 10476 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10477 */ 10478 private void postSendViewScrolledAccessibilityEventCallback() { 10479 if (mSendViewScrolledAccessibilityEvent == null) { 10480 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10481 } 10482 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10483 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10484 postDelayed(mSendViewScrolledAccessibilityEvent, 10485 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10486 } 10487 } 10488 10489 /** 10490 * Called by a parent to request that a child update its values for mScrollX 10491 * and mScrollY if necessary. This will typically be done if the child is 10492 * animating a scroll using a {@link android.widget.Scroller Scroller} 10493 * object. 10494 */ 10495 public void computeScroll() { 10496 } 10497 10498 /** 10499 * <p>Indicate whether the horizontal edges are faded when the view is 10500 * scrolled horizontally.</p> 10501 * 10502 * @return true if the horizontal edges should are faded on scroll, false 10503 * otherwise 10504 * 10505 * @see #setHorizontalFadingEdgeEnabled(boolean) 10506 * 10507 * @attr ref android.R.styleable#View_requiresFadingEdge 10508 */ 10509 public boolean isHorizontalFadingEdgeEnabled() { 10510 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10511 } 10512 10513 /** 10514 * <p>Define whether the horizontal edges should be faded when this view 10515 * is scrolled horizontally.</p> 10516 * 10517 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10518 * be faded when the view is scrolled 10519 * horizontally 10520 * 10521 * @see #isHorizontalFadingEdgeEnabled() 10522 * 10523 * @attr ref android.R.styleable#View_requiresFadingEdge 10524 */ 10525 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10526 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10527 if (horizontalFadingEdgeEnabled) { 10528 initScrollCache(); 10529 } 10530 10531 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10532 } 10533 } 10534 10535 /** 10536 * <p>Indicate whether the vertical edges are faded when the view is 10537 * scrolled horizontally.</p> 10538 * 10539 * @return true if the vertical edges should are faded on scroll, false 10540 * otherwise 10541 * 10542 * @see #setVerticalFadingEdgeEnabled(boolean) 10543 * 10544 * @attr ref android.R.styleable#View_requiresFadingEdge 10545 */ 10546 public boolean isVerticalFadingEdgeEnabled() { 10547 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10548 } 10549 10550 /** 10551 * <p>Define whether the vertical edges should be faded when this view 10552 * is scrolled vertically.</p> 10553 * 10554 * @param verticalFadingEdgeEnabled true if the vertical edges should 10555 * be faded when the view is scrolled 10556 * vertically 10557 * 10558 * @see #isVerticalFadingEdgeEnabled() 10559 * 10560 * @attr ref android.R.styleable#View_requiresFadingEdge 10561 */ 10562 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10563 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10564 if (verticalFadingEdgeEnabled) { 10565 initScrollCache(); 10566 } 10567 10568 mViewFlags ^= FADING_EDGE_VERTICAL; 10569 } 10570 } 10571 10572 /** 10573 * Returns the strength, or intensity, of the top faded edge. The strength is 10574 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10575 * returns 0.0 or 1.0 but no value in between. 10576 * 10577 * Subclasses should override this method to provide a smoother fade transition 10578 * when scrolling occurs. 10579 * 10580 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10581 */ 10582 protected float getTopFadingEdgeStrength() { 10583 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10584 } 10585 10586 /** 10587 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10588 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10589 * returns 0.0 or 1.0 but no value in between. 10590 * 10591 * Subclasses should override this method to provide a smoother fade transition 10592 * when scrolling occurs. 10593 * 10594 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10595 */ 10596 protected float getBottomFadingEdgeStrength() { 10597 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10598 computeVerticalScrollRange() ? 1.0f : 0.0f; 10599 } 10600 10601 /** 10602 * Returns the strength, or intensity, of the left faded edge. The strength is 10603 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10604 * returns 0.0 or 1.0 but no value in between. 10605 * 10606 * Subclasses should override this method to provide a smoother fade transition 10607 * when scrolling occurs. 10608 * 10609 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10610 */ 10611 protected float getLeftFadingEdgeStrength() { 10612 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10613 } 10614 10615 /** 10616 * Returns the strength, or intensity, of the right faded edge. The strength is 10617 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10618 * returns 0.0 or 1.0 but no value in between. 10619 * 10620 * Subclasses should override this method to provide a smoother fade transition 10621 * when scrolling occurs. 10622 * 10623 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10624 */ 10625 protected float getRightFadingEdgeStrength() { 10626 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10627 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10628 } 10629 10630 /** 10631 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10632 * scrollbar is not drawn by default.</p> 10633 * 10634 * @return true if the horizontal scrollbar should be painted, false 10635 * otherwise 10636 * 10637 * @see #setHorizontalScrollBarEnabled(boolean) 10638 */ 10639 public boolean isHorizontalScrollBarEnabled() { 10640 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10641 } 10642 10643 /** 10644 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10645 * scrollbar is not drawn by default.</p> 10646 * 10647 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10648 * be painted 10649 * 10650 * @see #isHorizontalScrollBarEnabled() 10651 */ 10652 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10653 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10654 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10655 computeOpaqueFlags(); 10656 resolvePadding(); 10657 } 10658 } 10659 10660 /** 10661 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10662 * scrollbar is not drawn by default.</p> 10663 * 10664 * @return true if the vertical scrollbar should be painted, false 10665 * otherwise 10666 * 10667 * @see #setVerticalScrollBarEnabled(boolean) 10668 */ 10669 public boolean isVerticalScrollBarEnabled() { 10670 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10671 } 10672 10673 /** 10674 * <p>Define whether the vertical scrollbar should be drawn or not. The 10675 * scrollbar is not drawn by default.</p> 10676 * 10677 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10678 * be painted 10679 * 10680 * @see #isVerticalScrollBarEnabled() 10681 */ 10682 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10683 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10684 mViewFlags ^= SCROLLBARS_VERTICAL; 10685 computeOpaqueFlags(); 10686 resolvePadding(); 10687 } 10688 } 10689 10690 /** 10691 * @hide 10692 */ 10693 protected void recomputePadding() { 10694 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10695 } 10696 10697 /** 10698 * Define whether scrollbars will fade when the view is not scrolling. 10699 * 10700 * @param fadeScrollbars wheter to enable fading 10701 * 10702 * @attr ref android.R.styleable#View_fadeScrollbars 10703 */ 10704 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10705 initScrollCache(); 10706 final ScrollabilityCache scrollabilityCache = mScrollCache; 10707 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10708 if (fadeScrollbars) { 10709 scrollabilityCache.state = ScrollabilityCache.OFF; 10710 } else { 10711 scrollabilityCache.state = ScrollabilityCache.ON; 10712 } 10713 } 10714 10715 /** 10716 * 10717 * Returns true if scrollbars will fade when this view is not scrolling 10718 * 10719 * @return true if scrollbar fading is enabled 10720 * 10721 * @attr ref android.R.styleable#View_fadeScrollbars 10722 */ 10723 public boolean isScrollbarFadingEnabled() { 10724 return mScrollCache != null && mScrollCache.fadeScrollBars; 10725 } 10726 10727 /** 10728 * 10729 * Returns the delay before scrollbars fade. 10730 * 10731 * @return the delay before scrollbars fade 10732 * 10733 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10734 */ 10735 public int getScrollBarDefaultDelayBeforeFade() { 10736 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10737 mScrollCache.scrollBarDefaultDelayBeforeFade; 10738 } 10739 10740 /** 10741 * Define the delay before scrollbars fade. 10742 * 10743 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10744 * 10745 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10746 */ 10747 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10748 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10749 } 10750 10751 /** 10752 * 10753 * Returns the scrollbar fade duration. 10754 * 10755 * @return the scrollbar fade duration 10756 * 10757 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10758 */ 10759 public int getScrollBarFadeDuration() { 10760 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10761 mScrollCache.scrollBarFadeDuration; 10762 } 10763 10764 /** 10765 * Define the scrollbar fade duration. 10766 * 10767 * @param scrollBarFadeDuration - the scrollbar fade duration 10768 * 10769 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10770 */ 10771 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10772 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10773 } 10774 10775 /** 10776 * 10777 * Returns the scrollbar size. 10778 * 10779 * @return the scrollbar size 10780 * 10781 * @attr ref android.R.styleable#View_scrollbarSize 10782 */ 10783 public int getScrollBarSize() { 10784 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10785 mScrollCache.scrollBarSize; 10786 } 10787 10788 /** 10789 * Define the scrollbar size. 10790 * 10791 * @param scrollBarSize - the scrollbar size 10792 * 10793 * @attr ref android.R.styleable#View_scrollbarSize 10794 */ 10795 public void setScrollBarSize(int scrollBarSize) { 10796 getScrollCache().scrollBarSize = scrollBarSize; 10797 } 10798 10799 /** 10800 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10801 * inset. When inset, they add to the padding of the view. And the scrollbars 10802 * can be drawn inside the padding area or on the edge of the view. For example, 10803 * if a view has a background drawable and you want to draw the scrollbars 10804 * inside the padding specified by the drawable, you can use 10805 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10806 * appear at the edge of the view, ignoring the padding, then you can use 10807 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10808 * @param style the style of the scrollbars. Should be one of 10809 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10810 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10811 * @see #SCROLLBARS_INSIDE_OVERLAY 10812 * @see #SCROLLBARS_INSIDE_INSET 10813 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10814 * @see #SCROLLBARS_OUTSIDE_INSET 10815 * 10816 * @attr ref android.R.styleable#View_scrollbarStyle 10817 */ 10818 public void setScrollBarStyle(int style) { 10819 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10820 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10821 computeOpaqueFlags(); 10822 resolvePadding(); 10823 } 10824 } 10825 10826 /** 10827 * <p>Returns the current scrollbar style.</p> 10828 * @return the current scrollbar style 10829 * @see #SCROLLBARS_INSIDE_OVERLAY 10830 * @see #SCROLLBARS_INSIDE_INSET 10831 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10832 * @see #SCROLLBARS_OUTSIDE_INSET 10833 * 10834 * @attr ref android.R.styleable#View_scrollbarStyle 10835 */ 10836 @ViewDebug.ExportedProperty(mapping = { 10837 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10838 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10839 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10840 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10841 }) 10842 public int getScrollBarStyle() { 10843 return mViewFlags & SCROLLBARS_STYLE_MASK; 10844 } 10845 10846 /** 10847 * <p>Compute the horizontal range that the horizontal scrollbar 10848 * represents.</p> 10849 * 10850 * <p>The range is expressed in arbitrary units that must be the same as the 10851 * units used by {@link #computeHorizontalScrollExtent()} and 10852 * {@link #computeHorizontalScrollOffset()}.</p> 10853 * 10854 * <p>The default range is the drawing width of this view.</p> 10855 * 10856 * @return the total horizontal range represented by the horizontal 10857 * scrollbar 10858 * 10859 * @see #computeHorizontalScrollExtent() 10860 * @see #computeHorizontalScrollOffset() 10861 * @see android.widget.ScrollBarDrawable 10862 */ 10863 protected int computeHorizontalScrollRange() { 10864 return getWidth(); 10865 } 10866 10867 /** 10868 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10869 * within the horizontal range. This value is used to compute the position 10870 * of the thumb within the scrollbar's track.</p> 10871 * 10872 * <p>The range is expressed in arbitrary units that must be the same as the 10873 * units used by {@link #computeHorizontalScrollRange()} and 10874 * {@link #computeHorizontalScrollExtent()}.</p> 10875 * 10876 * <p>The default offset is the scroll offset of this view.</p> 10877 * 10878 * @return the horizontal offset of the scrollbar's thumb 10879 * 10880 * @see #computeHorizontalScrollRange() 10881 * @see #computeHorizontalScrollExtent() 10882 * @see android.widget.ScrollBarDrawable 10883 */ 10884 protected int computeHorizontalScrollOffset() { 10885 return mScrollX; 10886 } 10887 10888 /** 10889 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10890 * within the horizontal range. This value is used to compute the length 10891 * of the thumb within the scrollbar's track.</p> 10892 * 10893 * <p>The range is expressed in arbitrary units that must be the same as the 10894 * units used by {@link #computeHorizontalScrollRange()} and 10895 * {@link #computeHorizontalScrollOffset()}.</p> 10896 * 10897 * <p>The default extent is the drawing width of this view.</p> 10898 * 10899 * @return the horizontal extent of the scrollbar's thumb 10900 * 10901 * @see #computeHorizontalScrollRange() 10902 * @see #computeHorizontalScrollOffset() 10903 * @see android.widget.ScrollBarDrawable 10904 */ 10905 protected int computeHorizontalScrollExtent() { 10906 return getWidth(); 10907 } 10908 10909 /** 10910 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10911 * 10912 * <p>The range is expressed in arbitrary units that must be the same as the 10913 * units used by {@link #computeVerticalScrollExtent()} and 10914 * {@link #computeVerticalScrollOffset()}.</p> 10915 * 10916 * @return the total vertical range represented by the vertical scrollbar 10917 * 10918 * <p>The default range is the drawing height of this view.</p> 10919 * 10920 * @see #computeVerticalScrollExtent() 10921 * @see #computeVerticalScrollOffset() 10922 * @see android.widget.ScrollBarDrawable 10923 */ 10924 protected int computeVerticalScrollRange() { 10925 return getHeight(); 10926 } 10927 10928 /** 10929 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10930 * within the horizontal range. This value is used to compute the position 10931 * of the thumb within the scrollbar's track.</p> 10932 * 10933 * <p>The range is expressed in arbitrary units that must be the same as the 10934 * units used by {@link #computeVerticalScrollRange()} and 10935 * {@link #computeVerticalScrollExtent()}.</p> 10936 * 10937 * <p>The default offset is the scroll offset of this view.</p> 10938 * 10939 * @return the vertical offset of the scrollbar's thumb 10940 * 10941 * @see #computeVerticalScrollRange() 10942 * @see #computeVerticalScrollExtent() 10943 * @see android.widget.ScrollBarDrawable 10944 */ 10945 protected int computeVerticalScrollOffset() { 10946 return mScrollY; 10947 } 10948 10949 /** 10950 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10951 * within the vertical range. This value is used to compute the length 10952 * of the thumb within the scrollbar's track.</p> 10953 * 10954 * <p>The range is expressed in arbitrary units that must be the same as the 10955 * units used by {@link #computeVerticalScrollRange()} and 10956 * {@link #computeVerticalScrollOffset()}.</p> 10957 * 10958 * <p>The default extent is the drawing height of this view.</p> 10959 * 10960 * @return the vertical extent of the scrollbar's thumb 10961 * 10962 * @see #computeVerticalScrollRange() 10963 * @see #computeVerticalScrollOffset() 10964 * @see android.widget.ScrollBarDrawable 10965 */ 10966 protected int computeVerticalScrollExtent() { 10967 return getHeight(); 10968 } 10969 10970 /** 10971 * Check if this view can be scrolled horizontally in a certain direction. 10972 * 10973 * @param direction Negative to check scrolling left, positive to check scrolling right. 10974 * @return true if this view can be scrolled in the specified direction, false otherwise. 10975 */ 10976 public boolean canScrollHorizontally(int direction) { 10977 final int offset = computeHorizontalScrollOffset(); 10978 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10979 if (range == 0) return false; 10980 if (direction < 0) { 10981 return offset > 0; 10982 } else { 10983 return offset < range - 1; 10984 } 10985 } 10986 10987 /** 10988 * Check if this view can be scrolled vertically in a certain direction. 10989 * 10990 * @param direction Negative to check scrolling up, positive to check scrolling down. 10991 * @return true if this view can be scrolled in the specified direction, false otherwise. 10992 */ 10993 public boolean canScrollVertically(int direction) { 10994 final int offset = computeVerticalScrollOffset(); 10995 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10996 if (range == 0) return false; 10997 if (direction < 0) { 10998 return offset > 0; 10999 } else { 11000 return offset < range - 1; 11001 } 11002 } 11003 11004 /** 11005 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11006 * scrollbars are painted only if they have been awakened first.</p> 11007 * 11008 * @param canvas the canvas on which to draw the scrollbars 11009 * 11010 * @see #awakenScrollBars(int) 11011 */ 11012 protected final void onDrawScrollBars(Canvas canvas) { 11013 // scrollbars are drawn only when the animation is running 11014 final ScrollabilityCache cache = mScrollCache; 11015 if (cache != null) { 11016 11017 int state = cache.state; 11018 11019 if (state == ScrollabilityCache.OFF) { 11020 return; 11021 } 11022 11023 boolean invalidate = false; 11024 11025 if (state == ScrollabilityCache.FADING) { 11026 // We're fading -- get our fade interpolation 11027 if (cache.interpolatorValues == null) { 11028 cache.interpolatorValues = new float[1]; 11029 } 11030 11031 float[] values = cache.interpolatorValues; 11032 11033 // Stops the animation if we're done 11034 if (cache.scrollBarInterpolator.timeToValues(values) == 11035 Interpolator.Result.FREEZE_END) { 11036 cache.state = ScrollabilityCache.OFF; 11037 } else { 11038 cache.scrollBar.setAlpha(Math.round(values[0])); 11039 } 11040 11041 // This will make the scroll bars inval themselves after 11042 // drawing. We only want this when we're fading so that 11043 // we prevent excessive redraws 11044 invalidate = true; 11045 } else { 11046 // We're just on -- but we may have been fading before so 11047 // reset alpha 11048 cache.scrollBar.setAlpha(255); 11049 } 11050 11051 11052 final int viewFlags = mViewFlags; 11053 11054 final boolean drawHorizontalScrollBar = 11055 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11056 final boolean drawVerticalScrollBar = 11057 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11058 && !isVerticalScrollBarHidden(); 11059 11060 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11061 final int width = mRight - mLeft; 11062 final int height = mBottom - mTop; 11063 11064 final ScrollBarDrawable scrollBar = cache.scrollBar; 11065 11066 final int scrollX = mScrollX; 11067 final int scrollY = mScrollY; 11068 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11069 11070 int left, top, right, bottom; 11071 11072 if (drawHorizontalScrollBar) { 11073 int size = scrollBar.getSize(false); 11074 if (size <= 0) { 11075 size = cache.scrollBarSize; 11076 } 11077 11078 scrollBar.setParameters(computeHorizontalScrollRange(), 11079 computeHorizontalScrollOffset(), 11080 computeHorizontalScrollExtent(), false); 11081 final int verticalScrollBarGap = drawVerticalScrollBar ? 11082 getVerticalScrollbarWidth() : 0; 11083 top = scrollY + height - size - (mUserPaddingBottom & inside); 11084 left = scrollX + (mPaddingLeft & inside); 11085 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11086 bottom = top + size; 11087 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11088 if (invalidate) { 11089 invalidate(left, top, right, bottom); 11090 } 11091 } 11092 11093 if (drawVerticalScrollBar) { 11094 int size = scrollBar.getSize(true); 11095 if (size <= 0) { 11096 size = cache.scrollBarSize; 11097 } 11098 11099 scrollBar.setParameters(computeVerticalScrollRange(), 11100 computeVerticalScrollOffset(), 11101 computeVerticalScrollExtent(), true); 11102 switch (mVerticalScrollbarPosition) { 11103 default: 11104 case SCROLLBAR_POSITION_DEFAULT: 11105 case SCROLLBAR_POSITION_RIGHT: 11106 left = scrollX + width - size - (mUserPaddingRight & inside); 11107 break; 11108 case SCROLLBAR_POSITION_LEFT: 11109 left = scrollX + (mUserPaddingLeft & inside); 11110 break; 11111 } 11112 top = scrollY + (mPaddingTop & inside); 11113 right = left + size; 11114 bottom = scrollY + height - (mUserPaddingBottom & inside); 11115 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11116 if (invalidate) { 11117 invalidate(left, top, right, bottom); 11118 } 11119 } 11120 } 11121 } 11122 } 11123 11124 /** 11125 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11126 * FastScroller is visible. 11127 * @return whether to temporarily hide the vertical scrollbar 11128 * @hide 11129 */ 11130 protected boolean isVerticalScrollBarHidden() { 11131 return false; 11132 } 11133 11134 /** 11135 * <p>Draw the horizontal scrollbar if 11136 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11137 * 11138 * @param canvas the canvas on which to draw the scrollbar 11139 * @param scrollBar the scrollbar's drawable 11140 * 11141 * @see #isHorizontalScrollBarEnabled() 11142 * @see #computeHorizontalScrollRange() 11143 * @see #computeHorizontalScrollExtent() 11144 * @see #computeHorizontalScrollOffset() 11145 * @see android.widget.ScrollBarDrawable 11146 * @hide 11147 */ 11148 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11149 int l, int t, int r, int b) { 11150 scrollBar.setBounds(l, t, r, b); 11151 scrollBar.draw(canvas); 11152 } 11153 11154 /** 11155 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11156 * returns true.</p> 11157 * 11158 * @param canvas the canvas on which to draw the scrollbar 11159 * @param scrollBar the scrollbar's drawable 11160 * 11161 * @see #isVerticalScrollBarEnabled() 11162 * @see #computeVerticalScrollRange() 11163 * @see #computeVerticalScrollExtent() 11164 * @see #computeVerticalScrollOffset() 11165 * @see android.widget.ScrollBarDrawable 11166 * @hide 11167 */ 11168 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11169 int l, int t, int r, int b) { 11170 scrollBar.setBounds(l, t, r, b); 11171 scrollBar.draw(canvas); 11172 } 11173 11174 /** 11175 * Implement this to do your drawing. 11176 * 11177 * @param canvas the canvas on which the background will be drawn 11178 */ 11179 protected void onDraw(Canvas canvas) { 11180 } 11181 11182 /* 11183 * Caller is responsible for calling requestLayout if necessary. 11184 * (This allows addViewInLayout to not request a new layout.) 11185 */ 11186 void assignParent(ViewParent parent) { 11187 if (mParent == null) { 11188 mParent = parent; 11189 } else if (parent == null) { 11190 mParent = null; 11191 } else { 11192 throw new RuntimeException("view " + this + " being added, but" 11193 + " it already has a parent"); 11194 } 11195 } 11196 11197 /** 11198 * This is called when the view is attached to a window. At this point it 11199 * has a Surface and will start drawing. Note that this function is 11200 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11201 * however it may be called any time before the first onDraw -- including 11202 * before or after {@link #onMeasure(int, int)}. 11203 * 11204 * @see #onDetachedFromWindow() 11205 */ 11206 protected void onAttachedToWindow() { 11207 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 11208 mParent.requestTransparentRegion(this); 11209 } 11210 11211 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11212 initialAwakenScrollBars(); 11213 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 11214 } 11215 11216 jumpDrawablesToCurrentState(); 11217 11218 // Order is important here: LayoutDirection MUST be resolved before Padding 11219 // and TextDirection 11220 resolveLayoutDirection(); 11221 resolvePadding(); 11222 resolveTextDirection(); 11223 resolveTextAlignment(); 11224 11225 clearAccessibilityFocus(); 11226 if (isFocused()) { 11227 InputMethodManager imm = InputMethodManager.peekInstance(); 11228 imm.focusIn(this); 11229 } 11230 11231 if (mAttachInfo != null && mDisplayList != null) { 11232 mAttachInfo.mViewRootImpl.dequeueDisplayList(mDisplayList); 11233 } 11234 } 11235 11236 /** 11237 * @see #onScreenStateChanged(int) 11238 */ 11239 void dispatchScreenStateChanged(int screenState) { 11240 onScreenStateChanged(screenState); 11241 } 11242 11243 /** 11244 * This method is called whenever the state of the screen this view is 11245 * attached to changes. A state change will usually occurs when the screen 11246 * turns on or off (whether it happens automatically or the user does it 11247 * manually.) 11248 * 11249 * @param screenState The new state of the screen. Can be either 11250 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11251 */ 11252 public void onScreenStateChanged(int screenState) { 11253 } 11254 11255 /** 11256 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11257 */ 11258 private boolean hasRtlSupport() { 11259 return mContext.getApplicationInfo().hasRtlSupport(); 11260 } 11261 11262 /** 11263 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11264 * that the parent directionality can and will be resolved before its children. 11265 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 11266 * @hide 11267 */ 11268 public void resolveLayoutDirection() { 11269 // Clear any previous layout direction resolution 11270 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11271 11272 if (hasRtlSupport()) { 11273 // Set resolved depending on layout direction 11274 switch (getLayoutDirection()) { 11275 case LAYOUT_DIRECTION_INHERIT: 11276 // If this is root view, no need to look at parent's layout dir. 11277 if (canResolveLayoutDirection()) { 11278 ViewGroup viewGroup = ((ViewGroup) mParent); 11279 11280 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11281 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11282 } 11283 } else { 11284 // Nothing to do, LTR by default 11285 } 11286 break; 11287 case LAYOUT_DIRECTION_RTL: 11288 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11289 break; 11290 case LAYOUT_DIRECTION_LOCALE: 11291 if(isLayoutDirectionRtl(Locale.getDefault())) { 11292 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11293 } 11294 break; 11295 default: 11296 // Nothing to do, LTR by default 11297 } 11298 } 11299 11300 // Set to resolved 11301 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 11302 onResolvedLayoutDirectionChanged(); 11303 // Resolve padding 11304 resolvePadding(); 11305 } 11306 11307 /** 11308 * Called when layout direction has been resolved. 11309 * 11310 * The default implementation does nothing. 11311 * @hide 11312 */ 11313 public void onResolvedLayoutDirectionChanged() { 11314 } 11315 11316 /** 11317 * Resolve padding depending on layout direction. 11318 * @hide 11319 */ 11320 public void resolvePadding() { 11321 // If the user specified the absolute padding (either with android:padding or 11322 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 11323 // use the default padding or the padding from the background drawable 11324 // (stored at this point in mPadding*) 11325 int resolvedLayoutDirection = getResolvedLayoutDirection(); 11326 switch (resolvedLayoutDirection) { 11327 case LAYOUT_DIRECTION_RTL: 11328 // Start user padding override Right user padding. Otherwise, if Right user 11329 // padding is not defined, use the default Right padding. If Right user padding 11330 // is defined, just use it. 11331 if (mUserPaddingStart >= 0) { 11332 mUserPaddingRight = mUserPaddingStart; 11333 } else if (mUserPaddingRight < 0) { 11334 mUserPaddingRight = mPaddingRight; 11335 } 11336 if (mUserPaddingEnd >= 0) { 11337 mUserPaddingLeft = mUserPaddingEnd; 11338 } else if (mUserPaddingLeft < 0) { 11339 mUserPaddingLeft = mPaddingLeft; 11340 } 11341 break; 11342 case LAYOUT_DIRECTION_LTR: 11343 default: 11344 // Start user padding override Left user padding. Otherwise, if Left user 11345 // padding is not defined, use the default left padding. If Left user padding 11346 // is defined, just use it. 11347 if (mUserPaddingStart >= 0) { 11348 mUserPaddingLeft = mUserPaddingStart; 11349 } else if (mUserPaddingLeft < 0) { 11350 mUserPaddingLeft = mPaddingLeft; 11351 } 11352 if (mUserPaddingEnd >= 0) { 11353 mUserPaddingRight = mUserPaddingEnd; 11354 } else if (mUserPaddingRight < 0) { 11355 mUserPaddingRight = mPaddingRight; 11356 } 11357 } 11358 11359 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11360 11361 if(isPaddingRelative()) { 11362 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11363 } else { 11364 recomputePadding(); 11365 } 11366 onPaddingChanged(resolvedLayoutDirection); 11367 } 11368 11369 /** 11370 * Resolve padding depending on the layout direction. Subclasses that care about 11371 * padding resolution should override this method. The default implementation does 11372 * nothing. 11373 * 11374 * @param layoutDirection the direction of the layout 11375 * 11376 * @see {@link #LAYOUT_DIRECTION_LTR} 11377 * @see {@link #LAYOUT_DIRECTION_RTL} 11378 * @hide 11379 */ 11380 public void onPaddingChanged(int layoutDirection) { 11381 } 11382 11383 /** 11384 * Check if layout direction resolution can be done. 11385 * 11386 * @return true if layout direction resolution can be done otherwise return false. 11387 * @hide 11388 */ 11389 public boolean canResolveLayoutDirection() { 11390 switch (getLayoutDirection()) { 11391 case LAYOUT_DIRECTION_INHERIT: 11392 return (mParent != null) && (mParent instanceof ViewGroup); 11393 default: 11394 return true; 11395 } 11396 } 11397 11398 /** 11399 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11400 * when reset is done. 11401 * @hide 11402 */ 11403 public void resetResolvedLayoutDirection() { 11404 // Reset the current resolved bits 11405 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11406 onResolvedLayoutDirectionReset(); 11407 // Reset also the text direction 11408 resetResolvedTextDirection(); 11409 } 11410 11411 /** 11412 * Called during reset of resolved layout direction. 11413 * 11414 * Subclasses need to override this method to clear cached information that depends on the 11415 * resolved layout direction, or to inform child views that inherit their layout direction. 11416 * 11417 * The default implementation does nothing. 11418 * @hide 11419 */ 11420 public void onResolvedLayoutDirectionReset() { 11421 } 11422 11423 /** 11424 * Check if a Locale uses an RTL script. 11425 * 11426 * @param locale Locale to check 11427 * @return true if the Locale uses an RTL script. 11428 * @hide 11429 */ 11430 protected static boolean isLayoutDirectionRtl(Locale locale) { 11431 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11432 } 11433 11434 /** 11435 * This is called when the view is detached from a window. At this point it 11436 * no longer has a surface for drawing. 11437 * 11438 * @see #onAttachedToWindow() 11439 */ 11440 protected void onDetachedFromWindow() { 11441 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11442 11443 removeUnsetPressCallback(); 11444 removeLongPressCallback(); 11445 removePerformClickCallback(); 11446 removeSendViewScrolledAccessibilityEventCallback(); 11447 11448 destroyDrawingCache(); 11449 11450 destroyLayer(false); 11451 11452 if (mAttachInfo != null) { 11453 if (mDisplayList != null) { 11454 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11455 } 11456 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11457 } else { 11458 if (mDisplayList != null) { 11459 // Should never happen 11460 mDisplayList.invalidate(); 11461 } 11462 } 11463 11464 mCurrentAnimation = null; 11465 11466 resetResolvedLayoutDirection(); 11467 resetResolvedTextAlignment(); 11468 resetAccessibilityStateChanged(); 11469 } 11470 11471 /** 11472 * @return The number of times this view has been attached to a window 11473 */ 11474 protected int getWindowAttachCount() { 11475 return mWindowAttachCount; 11476 } 11477 11478 /** 11479 * Retrieve a unique token identifying the window this view is attached to. 11480 * @return Return the window's token for use in 11481 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11482 */ 11483 public IBinder getWindowToken() { 11484 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11485 } 11486 11487 /** 11488 * Retrieve a unique token identifying the top-level "real" window of 11489 * the window that this view is attached to. That is, this is like 11490 * {@link #getWindowToken}, except if the window this view in is a panel 11491 * window (attached to another containing window), then the token of 11492 * the containing window is returned instead. 11493 * 11494 * @return Returns the associated window token, either 11495 * {@link #getWindowToken()} or the containing window's token. 11496 */ 11497 public IBinder getApplicationWindowToken() { 11498 AttachInfo ai = mAttachInfo; 11499 if (ai != null) { 11500 IBinder appWindowToken = ai.mPanelParentWindowToken; 11501 if (appWindowToken == null) { 11502 appWindowToken = ai.mWindowToken; 11503 } 11504 return appWindowToken; 11505 } 11506 return null; 11507 } 11508 11509 /** 11510 * Retrieve private session object this view hierarchy is using to 11511 * communicate with the window manager. 11512 * @return the session object to communicate with the window manager 11513 */ 11514 /*package*/ IWindowSession getWindowSession() { 11515 return mAttachInfo != null ? mAttachInfo.mSession : null; 11516 } 11517 11518 /** 11519 * @param info the {@link android.view.View.AttachInfo} to associated with 11520 * this view 11521 */ 11522 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11523 //System.out.println("Attached! " + this); 11524 mAttachInfo = info; 11525 mWindowAttachCount++; 11526 // We will need to evaluate the drawable state at least once. 11527 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11528 if (mFloatingTreeObserver != null) { 11529 info.mTreeObserver.merge(mFloatingTreeObserver); 11530 mFloatingTreeObserver = null; 11531 } 11532 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11533 mAttachInfo.mScrollContainers.add(this); 11534 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11535 } 11536 performCollectViewAttributes(mAttachInfo, visibility); 11537 onAttachedToWindow(); 11538 11539 ListenerInfo li = mListenerInfo; 11540 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11541 li != null ? li.mOnAttachStateChangeListeners : null; 11542 if (listeners != null && listeners.size() > 0) { 11543 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11544 // perform the dispatching. The iterator is a safe guard against listeners that 11545 // could mutate the list by calling the various add/remove methods. This prevents 11546 // the array from being modified while we iterate it. 11547 for (OnAttachStateChangeListener listener : listeners) { 11548 listener.onViewAttachedToWindow(this); 11549 } 11550 } 11551 11552 int vis = info.mWindowVisibility; 11553 if (vis != GONE) { 11554 onWindowVisibilityChanged(vis); 11555 } 11556 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11557 // If nobody has evaluated the drawable state yet, then do it now. 11558 refreshDrawableState(); 11559 } 11560 } 11561 11562 void dispatchDetachedFromWindow() { 11563 AttachInfo info = mAttachInfo; 11564 if (info != null) { 11565 int vis = info.mWindowVisibility; 11566 if (vis != GONE) { 11567 onWindowVisibilityChanged(GONE); 11568 } 11569 } 11570 11571 onDetachedFromWindow(); 11572 11573 ListenerInfo li = mListenerInfo; 11574 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11575 li != null ? li.mOnAttachStateChangeListeners : null; 11576 if (listeners != null && listeners.size() > 0) { 11577 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11578 // perform the dispatching. The iterator is a safe guard against listeners that 11579 // could mutate the list by calling the various add/remove methods. This prevents 11580 // the array from being modified while we iterate it. 11581 for (OnAttachStateChangeListener listener : listeners) { 11582 listener.onViewDetachedFromWindow(this); 11583 } 11584 } 11585 11586 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11587 mAttachInfo.mScrollContainers.remove(this); 11588 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11589 } 11590 11591 mAttachInfo = null; 11592 } 11593 11594 /** 11595 * Store this view hierarchy's frozen state into the given container. 11596 * 11597 * @param container The SparseArray in which to save the view's state. 11598 * 11599 * @see #restoreHierarchyState(android.util.SparseArray) 11600 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11601 * @see #onSaveInstanceState() 11602 */ 11603 public void saveHierarchyState(SparseArray<Parcelable> container) { 11604 dispatchSaveInstanceState(container); 11605 } 11606 11607 /** 11608 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11609 * this view and its children. May be overridden to modify how freezing happens to a 11610 * view's children; for example, some views may want to not store state for their children. 11611 * 11612 * @param container The SparseArray in which to save the view's state. 11613 * 11614 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11615 * @see #saveHierarchyState(android.util.SparseArray) 11616 * @see #onSaveInstanceState() 11617 */ 11618 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11619 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11620 mPrivateFlags &= ~SAVE_STATE_CALLED; 11621 Parcelable state = onSaveInstanceState(); 11622 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11623 throw new IllegalStateException( 11624 "Derived class did not call super.onSaveInstanceState()"); 11625 } 11626 if (state != null) { 11627 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11628 // + ": " + state); 11629 container.put(mID, state); 11630 } 11631 } 11632 } 11633 11634 /** 11635 * Hook allowing a view to generate a representation of its internal state 11636 * that can later be used to create a new instance with that same state. 11637 * This state should only contain information that is not persistent or can 11638 * not be reconstructed later. For example, you will never store your 11639 * current position on screen because that will be computed again when a 11640 * new instance of the view is placed in its view hierarchy. 11641 * <p> 11642 * Some examples of things you may store here: the current cursor position 11643 * in a text view (but usually not the text itself since that is stored in a 11644 * content provider or other persistent storage), the currently selected 11645 * item in a list view. 11646 * 11647 * @return Returns a Parcelable object containing the view's current dynamic 11648 * state, or null if there is nothing interesting to save. The 11649 * default implementation returns null. 11650 * @see #onRestoreInstanceState(android.os.Parcelable) 11651 * @see #saveHierarchyState(android.util.SparseArray) 11652 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11653 * @see #setSaveEnabled(boolean) 11654 */ 11655 protected Parcelable onSaveInstanceState() { 11656 mPrivateFlags |= SAVE_STATE_CALLED; 11657 return BaseSavedState.EMPTY_STATE; 11658 } 11659 11660 /** 11661 * Restore this view hierarchy's frozen state from the given container. 11662 * 11663 * @param container The SparseArray which holds previously frozen states. 11664 * 11665 * @see #saveHierarchyState(android.util.SparseArray) 11666 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11667 * @see #onRestoreInstanceState(android.os.Parcelable) 11668 */ 11669 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11670 dispatchRestoreInstanceState(container); 11671 } 11672 11673 /** 11674 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11675 * state for this view and its children. May be overridden to modify how restoring 11676 * happens to a view's children; for example, some views may want to not store state 11677 * for their children. 11678 * 11679 * @param container The SparseArray which holds previously saved state. 11680 * 11681 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11682 * @see #restoreHierarchyState(android.util.SparseArray) 11683 * @see #onRestoreInstanceState(android.os.Parcelable) 11684 */ 11685 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11686 if (mID != NO_ID) { 11687 Parcelable state = container.get(mID); 11688 if (state != null) { 11689 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11690 // + ": " + state); 11691 mPrivateFlags &= ~SAVE_STATE_CALLED; 11692 onRestoreInstanceState(state); 11693 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11694 throw new IllegalStateException( 11695 "Derived class did not call super.onRestoreInstanceState()"); 11696 } 11697 } 11698 } 11699 } 11700 11701 /** 11702 * Hook allowing a view to re-apply a representation of its internal state that had previously 11703 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11704 * null state. 11705 * 11706 * @param state The frozen state that had previously been returned by 11707 * {@link #onSaveInstanceState}. 11708 * 11709 * @see #onSaveInstanceState() 11710 * @see #restoreHierarchyState(android.util.SparseArray) 11711 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11712 */ 11713 protected void onRestoreInstanceState(Parcelable state) { 11714 mPrivateFlags |= SAVE_STATE_CALLED; 11715 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11716 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11717 + "received " + state.getClass().toString() + " instead. This usually happens " 11718 + "when two views of different type have the same id in the same hierarchy. " 11719 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11720 + "other views do not use the same id."); 11721 } 11722 } 11723 11724 /** 11725 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11726 * 11727 * @return the drawing start time in milliseconds 11728 */ 11729 public long getDrawingTime() { 11730 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11731 } 11732 11733 /** 11734 * <p>Enables or disables the duplication of the parent's state into this view. When 11735 * duplication is enabled, this view gets its drawable state from its parent rather 11736 * than from its own internal properties.</p> 11737 * 11738 * <p>Note: in the current implementation, setting this property to true after the 11739 * view was added to a ViewGroup might have no effect at all. This property should 11740 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11741 * 11742 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11743 * property is enabled, an exception will be thrown.</p> 11744 * 11745 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11746 * parent, these states should not be affected by this method.</p> 11747 * 11748 * @param enabled True to enable duplication of the parent's drawable state, false 11749 * to disable it. 11750 * 11751 * @see #getDrawableState() 11752 * @see #isDuplicateParentStateEnabled() 11753 */ 11754 public void setDuplicateParentStateEnabled(boolean enabled) { 11755 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11756 } 11757 11758 /** 11759 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11760 * 11761 * @return True if this view's drawable state is duplicated from the parent, 11762 * false otherwise 11763 * 11764 * @see #getDrawableState() 11765 * @see #setDuplicateParentStateEnabled(boolean) 11766 */ 11767 public boolean isDuplicateParentStateEnabled() { 11768 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11769 } 11770 11771 /** 11772 * <p>Specifies the type of layer backing this view. The layer can be 11773 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11774 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11775 * 11776 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11777 * instance that controls how the layer is composed on screen. The following 11778 * properties of the paint are taken into account when composing the layer:</p> 11779 * <ul> 11780 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11781 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11782 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11783 * </ul> 11784 * 11785 * <p>If this view has an alpha value set to < 1.0 by calling 11786 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11787 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11788 * equivalent to setting a hardware layer on this view and providing a paint with 11789 * the desired alpha value.<p> 11790 * 11791 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11792 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11793 * for more information on when and how to use layers.</p> 11794 * 11795 * @param layerType The ype of layer to use with this view, must be one of 11796 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11797 * {@link #LAYER_TYPE_HARDWARE} 11798 * @param paint The paint used to compose the layer. This argument is optional 11799 * and can be null. It is ignored when the layer type is 11800 * {@link #LAYER_TYPE_NONE} 11801 * 11802 * @see #getLayerType() 11803 * @see #LAYER_TYPE_NONE 11804 * @see #LAYER_TYPE_SOFTWARE 11805 * @see #LAYER_TYPE_HARDWARE 11806 * @see #setAlpha(float) 11807 * 11808 * @attr ref android.R.styleable#View_layerType 11809 */ 11810 public void setLayerType(int layerType, Paint paint) { 11811 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11812 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11813 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11814 } 11815 11816 if (layerType == mLayerType) { 11817 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11818 mLayerPaint = paint == null ? new Paint() : paint; 11819 invalidateParentCaches(); 11820 invalidate(true); 11821 } 11822 return; 11823 } 11824 11825 // Destroy any previous software drawing cache if needed 11826 switch (mLayerType) { 11827 case LAYER_TYPE_HARDWARE: 11828 destroyLayer(false); 11829 // fall through - non-accelerated views may use software layer mechanism instead 11830 case LAYER_TYPE_SOFTWARE: 11831 destroyDrawingCache(); 11832 break; 11833 default: 11834 break; 11835 } 11836 11837 mLayerType = layerType; 11838 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11839 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11840 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11841 11842 invalidateParentCaches(); 11843 invalidate(true); 11844 } 11845 11846 /** 11847 * Indicates whether this view has a static layer. A view with layer type 11848 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11849 * dynamic. 11850 */ 11851 boolean hasStaticLayer() { 11852 return true; 11853 } 11854 11855 /** 11856 * Indicates what type of layer is currently associated with this view. By default 11857 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11858 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11859 * for more information on the different types of layers. 11860 * 11861 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11862 * {@link #LAYER_TYPE_HARDWARE} 11863 * 11864 * @see #setLayerType(int, android.graphics.Paint) 11865 * @see #buildLayer() 11866 * @see #LAYER_TYPE_NONE 11867 * @see #LAYER_TYPE_SOFTWARE 11868 * @see #LAYER_TYPE_HARDWARE 11869 */ 11870 public int getLayerType() { 11871 return mLayerType; 11872 } 11873 11874 /** 11875 * Forces this view's layer to be created and this view to be rendered 11876 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11877 * invoking this method will have no effect. 11878 * 11879 * This method can for instance be used to render a view into its layer before 11880 * starting an animation. If this view is complex, rendering into the layer 11881 * before starting the animation will avoid skipping frames. 11882 * 11883 * @throws IllegalStateException If this view is not attached to a window 11884 * 11885 * @see #setLayerType(int, android.graphics.Paint) 11886 */ 11887 public void buildLayer() { 11888 if (mLayerType == LAYER_TYPE_NONE) return; 11889 11890 if (mAttachInfo == null) { 11891 throw new IllegalStateException("This view must be attached to a window first"); 11892 } 11893 11894 switch (mLayerType) { 11895 case LAYER_TYPE_HARDWARE: 11896 if (mAttachInfo.mHardwareRenderer != null && 11897 mAttachInfo.mHardwareRenderer.isEnabled() && 11898 mAttachInfo.mHardwareRenderer.validate()) { 11899 getHardwareLayer(); 11900 } 11901 break; 11902 case LAYER_TYPE_SOFTWARE: 11903 buildDrawingCache(true); 11904 break; 11905 } 11906 } 11907 11908 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11909 void flushLayer() { 11910 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11911 mHardwareLayer.flush(); 11912 } 11913 } 11914 11915 /** 11916 * <p>Returns a hardware layer that can be used to draw this view again 11917 * without executing its draw method.</p> 11918 * 11919 * @return A HardwareLayer ready to render, or null if an error occurred. 11920 */ 11921 HardwareLayer getHardwareLayer() { 11922 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11923 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11924 return null; 11925 } 11926 11927 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11928 11929 final int width = mRight - mLeft; 11930 final int height = mBottom - mTop; 11931 11932 if (width == 0 || height == 0) { 11933 return null; 11934 } 11935 11936 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11937 if (mHardwareLayer == null) { 11938 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11939 width, height, isOpaque()); 11940 mLocalDirtyRect.set(0, 0, width, height); 11941 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11942 mHardwareLayer.resize(width, height); 11943 mLocalDirtyRect.set(0, 0, width, height); 11944 } 11945 11946 // The layer is not valid if the underlying GPU resources cannot be allocated 11947 if (!mHardwareLayer.isValid()) { 11948 return null; 11949 } 11950 11951 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11952 mLocalDirtyRect.setEmpty(); 11953 } 11954 11955 return mHardwareLayer; 11956 } 11957 11958 /** 11959 * Destroys this View's hardware layer if possible. 11960 * 11961 * @return True if the layer was destroyed, false otherwise. 11962 * 11963 * @see #setLayerType(int, android.graphics.Paint) 11964 * @see #LAYER_TYPE_HARDWARE 11965 */ 11966 boolean destroyLayer(boolean valid) { 11967 if (mHardwareLayer != null) { 11968 AttachInfo info = mAttachInfo; 11969 if (info != null && info.mHardwareRenderer != null && 11970 info.mHardwareRenderer.isEnabled() && 11971 (valid || info.mHardwareRenderer.validate())) { 11972 mHardwareLayer.destroy(); 11973 mHardwareLayer = null; 11974 11975 invalidate(true); 11976 invalidateParentCaches(); 11977 } 11978 return true; 11979 } 11980 return false; 11981 } 11982 11983 /** 11984 * Destroys all hardware rendering resources. This method is invoked 11985 * when the system needs to reclaim resources. Upon execution of this 11986 * method, you should free any OpenGL resources created by the view. 11987 * 11988 * Note: you <strong>must</strong> call 11989 * <code>super.destroyHardwareResources()</code> when overriding 11990 * this method. 11991 * 11992 * @hide 11993 */ 11994 protected void destroyHardwareResources() { 11995 destroyLayer(true); 11996 } 11997 11998 /** 11999 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 12000 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 12001 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 12002 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 12003 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 12004 * null.</p> 12005 * 12006 * <p>Enabling the drawing cache is similar to 12007 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 12008 * acceleration is turned off. When hardware acceleration is turned on, enabling the 12009 * drawing cache has no effect on rendering because the system uses a different mechanism 12010 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 12011 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 12012 * for information on how to enable software and hardware layers.</p> 12013 * 12014 * <p>This API can be used to manually generate 12015 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 12016 * {@link #getDrawingCache()}.</p> 12017 * 12018 * @param enabled true to enable the drawing cache, false otherwise 12019 * 12020 * @see #isDrawingCacheEnabled() 12021 * @see #getDrawingCache() 12022 * @see #buildDrawingCache() 12023 * @see #setLayerType(int, android.graphics.Paint) 12024 */ 12025 public void setDrawingCacheEnabled(boolean enabled) { 12026 mCachingFailed = false; 12027 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12028 } 12029 12030 /** 12031 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12032 * 12033 * @return true if the drawing cache is enabled 12034 * 12035 * @see #setDrawingCacheEnabled(boolean) 12036 * @see #getDrawingCache() 12037 */ 12038 @ViewDebug.ExportedProperty(category = "drawing") 12039 public boolean isDrawingCacheEnabled() { 12040 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12041 } 12042 12043 /** 12044 * Debugging utility which recursively outputs the dirty state of a view and its 12045 * descendants. 12046 * 12047 * @hide 12048 */ 12049 @SuppressWarnings({"UnusedDeclaration"}) 12050 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12051 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 12052 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 12053 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 12054 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 12055 if (clear) { 12056 mPrivateFlags &= clearMask; 12057 } 12058 if (this instanceof ViewGroup) { 12059 ViewGroup parent = (ViewGroup) this; 12060 final int count = parent.getChildCount(); 12061 for (int i = 0; i < count; i++) { 12062 final View child = parent.getChildAt(i); 12063 child.outputDirtyFlags(indent + " ", clear, clearMask); 12064 } 12065 } 12066 } 12067 12068 /** 12069 * This method is used by ViewGroup to cause its children to restore or recreate their 12070 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12071 * to recreate its own display list, which would happen if it went through the normal 12072 * draw/dispatchDraw mechanisms. 12073 * 12074 * @hide 12075 */ 12076 protected void dispatchGetDisplayList() {} 12077 12078 /** 12079 * A view that is not attached or hardware accelerated cannot create a display list. 12080 * This method checks these conditions and returns the appropriate result. 12081 * 12082 * @return true if view has the ability to create a display list, false otherwise. 12083 * 12084 * @hide 12085 */ 12086 public boolean canHaveDisplayList() { 12087 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12088 } 12089 12090 /** 12091 * @return The HardwareRenderer associated with that view or null if hardware rendering 12092 * is not supported or this this has not been attached to a window. 12093 * 12094 * @hide 12095 */ 12096 public HardwareRenderer getHardwareRenderer() { 12097 if (mAttachInfo != null) { 12098 return mAttachInfo.mHardwareRenderer; 12099 } 12100 return null; 12101 } 12102 12103 /** 12104 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12105 * Otherwise, the same display list will be returned (after having been rendered into 12106 * along the way, depending on the invalidation state of the view). 12107 * 12108 * @param displayList The previous version of this displayList, could be null. 12109 * @param isLayer Whether the requester of the display list is a layer. If so, 12110 * the view will avoid creating a layer inside the resulting display list. 12111 * @return A new or reused DisplayList object. 12112 */ 12113 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12114 if (!canHaveDisplayList()) { 12115 return null; 12116 } 12117 12118 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 12119 displayList == null || !displayList.isValid() || 12120 (!isLayer && mRecreateDisplayList))) { 12121 // Don't need to recreate the display list, just need to tell our 12122 // children to restore/recreate theirs 12123 if (displayList != null && displayList.isValid() && 12124 !isLayer && !mRecreateDisplayList) { 12125 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12126 mPrivateFlags &= ~DIRTY_MASK; 12127 dispatchGetDisplayList(); 12128 12129 return displayList; 12130 } 12131 12132 if (!isLayer) { 12133 // If we got here, we're recreating it. Mark it as such to ensure that 12134 // we copy in child display lists into ours in drawChild() 12135 mRecreateDisplayList = true; 12136 } 12137 if (displayList == null) { 12138 final String name = getClass().getSimpleName(); 12139 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12140 // If we're creating a new display list, make sure our parent gets invalidated 12141 // since they will need to recreate their display list to account for this 12142 // new child display list. 12143 invalidateParentCaches(); 12144 } 12145 12146 boolean caching = false; 12147 final HardwareCanvas canvas = displayList.start(); 12148 int width = mRight - mLeft; 12149 int height = mBottom - mTop; 12150 12151 try { 12152 canvas.setViewport(width, height); 12153 // The dirty rect should always be null for a display list 12154 canvas.onPreDraw(null); 12155 int layerType = ( 12156 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 12157 getLayerType() : LAYER_TYPE_NONE; 12158 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12159 if (layerType == LAYER_TYPE_HARDWARE) { 12160 final HardwareLayer layer = getHardwareLayer(); 12161 if (layer != null && layer.isValid()) { 12162 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12163 } else { 12164 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12165 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12166 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12167 } 12168 caching = true; 12169 } else { 12170 buildDrawingCache(true); 12171 Bitmap cache = getDrawingCache(true); 12172 if (cache != null) { 12173 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12174 caching = true; 12175 } 12176 } 12177 } else { 12178 12179 computeScroll(); 12180 12181 canvas.translate(-mScrollX, -mScrollY); 12182 if (!isLayer) { 12183 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12184 mPrivateFlags &= ~DIRTY_MASK; 12185 } 12186 12187 // Fast path for layouts with no backgrounds 12188 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12189 dispatchDraw(canvas); 12190 } else { 12191 draw(canvas); 12192 } 12193 } 12194 } finally { 12195 canvas.onPostDraw(); 12196 12197 displayList.end(); 12198 displayList.setCaching(caching); 12199 if (isLayer) { 12200 displayList.setLeftTopRightBottom(0, 0, width, height); 12201 } else { 12202 setDisplayListProperties(displayList); 12203 } 12204 } 12205 } else if (!isLayer) { 12206 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12207 mPrivateFlags &= ~DIRTY_MASK; 12208 } 12209 12210 return displayList; 12211 } 12212 12213 /** 12214 * Get the DisplayList for the HardwareLayer 12215 * 12216 * @param layer The HardwareLayer whose DisplayList we want 12217 * @return A DisplayList fopr the specified HardwareLayer 12218 */ 12219 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12220 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12221 layer.setDisplayList(displayList); 12222 return displayList; 12223 } 12224 12225 12226 /** 12227 * <p>Returns a display list that can be used to draw this view again 12228 * without executing its draw method.</p> 12229 * 12230 * @return A DisplayList ready to replay, or null if caching is not enabled. 12231 * 12232 * @hide 12233 */ 12234 public DisplayList getDisplayList() { 12235 mDisplayList = getDisplayList(mDisplayList, false); 12236 return mDisplayList; 12237 } 12238 12239 /** 12240 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12241 * 12242 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12243 * 12244 * @see #getDrawingCache(boolean) 12245 */ 12246 public Bitmap getDrawingCache() { 12247 return getDrawingCache(false); 12248 } 12249 12250 /** 12251 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12252 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12253 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12254 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12255 * request the drawing cache by calling this method and draw it on screen if the 12256 * returned bitmap is not null.</p> 12257 * 12258 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12259 * this method will create a bitmap of the same size as this view. Because this bitmap 12260 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12261 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12262 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12263 * size than the view. This implies that your application must be able to handle this 12264 * size.</p> 12265 * 12266 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12267 * the current density of the screen when the application is in compatibility 12268 * mode. 12269 * 12270 * @return A bitmap representing this view or null if cache is disabled. 12271 * 12272 * @see #setDrawingCacheEnabled(boolean) 12273 * @see #isDrawingCacheEnabled() 12274 * @see #buildDrawingCache(boolean) 12275 * @see #destroyDrawingCache() 12276 */ 12277 public Bitmap getDrawingCache(boolean autoScale) { 12278 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12279 return null; 12280 } 12281 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12282 buildDrawingCache(autoScale); 12283 } 12284 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12285 } 12286 12287 /** 12288 * <p>Frees the resources used by the drawing cache. If you call 12289 * {@link #buildDrawingCache()} manually without calling 12290 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12291 * should cleanup the cache with this method afterwards.</p> 12292 * 12293 * @see #setDrawingCacheEnabled(boolean) 12294 * @see #buildDrawingCache() 12295 * @see #getDrawingCache() 12296 */ 12297 public void destroyDrawingCache() { 12298 if (mDrawingCache != null) { 12299 mDrawingCache.recycle(); 12300 mDrawingCache = null; 12301 } 12302 if (mUnscaledDrawingCache != null) { 12303 mUnscaledDrawingCache.recycle(); 12304 mUnscaledDrawingCache = null; 12305 } 12306 } 12307 12308 /** 12309 * Setting a solid background color for the drawing cache's bitmaps will improve 12310 * performance and memory usage. Note, though that this should only be used if this 12311 * view will always be drawn on top of a solid color. 12312 * 12313 * @param color The background color to use for the drawing cache's bitmap 12314 * 12315 * @see #setDrawingCacheEnabled(boolean) 12316 * @see #buildDrawingCache() 12317 * @see #getDrawingCache() 12318 */ 12319 public void setDrawingCacheBackgroundColor(int color) { 12320 if (color != mDrawingCacheBackgroundColor) { 12321 mDrawingCacheBackgroundColor = color; 12322 mPrivateFlags &= ~DRAWING_CACHE_VALID; 12323 } 12324 } 12325 12326 /** 12327 * @see #setDrawingCacheBackgroundColor(int) 12328 * 12329 * @return The background color to used for the drawing cache's bitmap 12330 */ 12331 public int getDrawingCacheBackgroundColor() { 12332 return mDrawingCacheBackgroundColor; 12333 } 12334 12335 /** 12336 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12337 * 12338 * @see #buildDrawingCache(boolean) 12339 */ 12340 public void buildDrawingCache() { 12341 buildDrawingCache(false); 12342 } 12343 12344 /** 12345 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12346 * 12347 * <p>If you call {@link #buildDrawingCache()} manually without calling 12348 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12349 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12350 * 12351 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12352 * this method will create a bitmap of the same size as this view. Because this bitmap 12353 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12354 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12355 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12356 * size than the view. This implies that your application must be able to handle this 12357 * size.</p> 12358 * 12359 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12360 * you do not need the drawing cache bitmap, calling this method will increase memory 12361 * usage and cause the view to be rendered in software once, thus negatively impacting 12362 * performance.</p> 12363 * 12364 * @see #getDrawingCache() 12365 * @see #destroyDrawingCache() 12366 */ 12367 public void buildDrawingCache(boolean autoScale) { 12368 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12369 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12370 mCachingFailed = false; 12371 12372 int width = mRight - mLeft; 12373 int height = mBottom - mTop; 12374 12375 final AttachInfo attachInfo = mAttachInfo; 12376 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12377 12378 if (autoScale && scalingRequired) { 12379 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12380 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12381 } 12382 12383 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12384 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12385 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12386 12387 if (width <= 0 || height <= 0 || 12388 // Projected bitmap size in bytes 12389 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12390 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12391 destroyDrawingCache(); 12392 mCachingFailed = true; 12393 return; 12394 } 12395 12396 boolean clear = true; 12397 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12398 12399 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12400 Bitmap.Config quality; 12401 if (!opaque) { 12402 // Never pick ARGB_4444 because it looks awful 12403 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12404 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12405 case DRAWING_CACHE_QUALITY_AUTO: 12406 quality = Bitmap.Config.ARGB_8888; 12407 break; 12408 case DRAWING_CACHE_QUALITY_LOW: 12409 quality = Bitmap.Config.ARGB_8888; 12410 break; 12411 case DRAWING_CACHE_QUALITY_HIGH: 12412 quality = Bitmap.Config.ARGB_8888; 12413 break; 12414 default: 12415 quality = Bitmap.Config.ARGB_8888; 12416 break; 12417 } 12418 } else { 12419 // Optimization for translucent windows 12420 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12421 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12422 } 12423 12424 // Try to cleanup memory 12425 if (bitmap != null) bitmap.recycle(); 12426 12427 try { 12428 bitmap = Bitmap.createBitmap(width, height, quality); 12429 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12430 if (autoScale) { 12431 mDrawingCache = bitmap; 12432 } else { 12433 mUnscaledDrawingCache = bitmap; 12434 } 12435 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12436 } catch (OutOfMemoryError e) { 12437 // If there is not enough memory to create the bitmap cache, just 12438 // ignore the issue as bitmap caches are not required to draw the 12439 // view hierarchy 12440 if (autoScale) { 12441 mDrawingCache = null; 12442 } else { 12443 mUnscaledDrawingCache = null; 12444 } 12445 mCachingFailed = true; 12446 return; 12447 } 12448 12449 clear = drawingCacheBackgroundColor != 0; 12450 } 12451 12452 Canvas canvas; 12453 if (attachInfo != null) { 12454 canvas = attachInfo.mCanvas; 12455 if (canvas == null) { 12456 canvas = new Canvas(); 12457 } 12458 canvas.setBitmap(bitmap); 12459 // Temporarily clobber the cached Canvas in case one of our children 12460 // is also using a drawing cache. Without this, the children would 12461 // steal the canvas by attaching their own bitmap to it and bad, bad 12462 // thing would happen (invisible views, corrupted drawings, etc.) 12463 attachInfo.mCanvas = null; 12464 } else { 12465 // This case should hopefully never or seldom happen 12466 canvas = new Canvas(bitmap); 12467 } 12468 12469 if (clear) { 12470 bitmap.eraseColor(drawingCacheBackgroundColor); 12471 } 12472 12473 computeScroll(); 12474 final int restoreCount = canvas.save(); 12475 12476 if (autoScale && scalingRequired) { 12477 final float scale = attachInfo.mApplicationScale; 12478 canvas.scale(scale, scale); 12479 } 12480 12481 canvas.translate(-mScrollX, -mScrollY); 12482 12483 mPrivateFlags |= DRAWN; 12484 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12485 mLayerType != LAYER_TYPE_NONE) { 12486 mPrivateFlags |= DRAWING_CACHE_VALID; 12487 } 12488 12489 // Fast path for layouts with no backgrounds 12490 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12491 mPrivateFlags &= ~DIRTY_MASK; 12492 dispatchDraw(canvas); 12493 } else { 12494 draw(canvas); 12495 } 12496 12497 canvas.restoreToCount(restoreCount); 12498 canvas.setBitmap(null); 12499 12500 if (attachInfo != null) { 12501 // Restore the cached Canvas for our siblings 12502 attachInfo.mCanvas = canvas; 12503 } 12504 } 12505 } 12506 12507 /** 12508 * Create a snapshot of the view into a bitmap. We should probably make 12509 * some form of this public, but should think about the API. 12510 */ 12511 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12512 int width = mRight - mLeft; 12513 int height = mBottom - mTop; 12514 12515 final AttachInfo attachInfo = mAttachInfo; 12516 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12517 width = (int) ((width * scale) + 0.5f); 12518 height = (int) ((height * scale) + 0.5f); 12519 12520 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12521 if (bitmap == null) { 12522 throw new OutOfMemoryError(); 12523 } 12524 12525 Resources resources = getResources(); 12526 if (resources != null) { 12527 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12528 } 12529 12530 Canvas canvas; 12531 if (attachInfo != null) { 12532 canvas = attachInfo.mCanvas; 12533 if (canvas == null) { 12534 canvas = new Canvas(); 12535 } 12536 canvas.setBitmap(bitmap); 12537 // Temporarily clobber the cached Canvas in case one of our children 12538 // is also using a drawing cache. Without this, the children would 12539 // steal the canvas by attaching their own bitmap to it and bad, bad 12540 // things would happen (invisible views, corrupted drawings, etc.) 12541 attachInfo.mCanvas = null; 12542 } else { 12543 // This case should hopefully never or seldom happen 12544 canvas = new Canvas(bitmap); 12545 } 12546 12547 if ((backgroundColor & 0xff000000) != 0) { 12548 bitmap.eraseColor(backgroundColor); 12549 } 12550 12551 computeScroll(); 12552 final int restoreCount = canvas.save(); 12553 canvas.scale(scale, scale); 12554 canvas.translate(-mScrollX, -mScrollY); 12555 12556 // Temporarily remove the dirty mask 12557 int flags = mPrivateFlags; 12558 mPrivateFlags &= ~DIRTY_MASK; 12559 12560 // Fast path for layouts with no backgrounds 12561 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12562 dispatchDraw(canvas); 12563 } else { 12564 draw(canvas); 12565 } 12566 12567 mPrivateFlags = flags; 12568 12569 canvas.restoreToCount(restoreCount); 12570 canvas.setBitmap(null); 12571 12572 if (attachInfo != null) { 12573 // Restore the cached Canvas for our siblings 12574 attachInfo.mCanvas = canvas; 12575 } 12576 12577 return bitmap; 12578 } 12579 12580 /** 12581 * Indicates whether this View is currently in edit mode. A View is usually 12582 * in edit mode when displayed within a developer tool. For instance, if 12583 * this View is being drawn by a visual user interface builder, this method 12584 * should return true. 12585 * 12586 * Subclasses should check the return value of this method to provide 12587 * different behaviors if their normal behavior might interfere with the 12588 * host environment. For instance: the class spawns a thread in its 12589 * constructor, the drawing code relies on device-specific features, etc. 12590 * 12591 * This method is usually checked in the drawing code of custom widgets. 12592 * 12593 * @return True if this View is in edit mode, false otherwise. 12594 */ 12595 public boolean isInEditMode() { 12596 return false; 12597 } 12598 12599 /** 12600 * If the View draws content inside its padding and enables fading edges, 12601 * it needs to support padding offsets. Padding offsets are added to the 12602 * fading edges to extend the length of the fade so that it covers pixels 12603 * drawn inside the padding. 12604 * 12605 * Subclasses of this class should override this method if they need 12606 * to draw content inside the padding. 12607 * 12608 * @return True if padding offset must be applied, false otherwise. 12609 * 12610 * @see #getLeftPaddingOffset() 12611 * @see #getRightPaddingOffset() 12612 * @see #getTopPaddingOffset() 12613 * @see #getBottomPaddingOffset() 12614 * 12615 * @since CURRENT 12616 */ 12617 protected boolean isPaddingOffsetRequired() { 12618 return false; 12619 } 12620 12621 /** 12622 * Amount by which to extend the left fading region. Called only when 12623 * {@link #isPaddingOffsetRequired()} returns true. 12624 * 12625 * @return The left padding offset in pixels. 12626 * 12627 * @see #isPaddingOffsetRequired() 12628 * 12629 * @since CURRENT 12630 */ 12631 protected int getLeftPaddingOffset() { 12632 return 0; 12633 } 12634 12635 /** 12636 * Amount by which to extend the right fading region. Called only when 12637 * {@link #isPaddingOffsetRequired()} returns true. 12638 * 12639 * @return The right padding offset in pixels. 12640 * 12641 * @see #isPaddingOffsetRequired() 12642 * 12643 * @since CURRENT 12644 */ 12645 protected int getRightPaddingOffset() { 12646 return 0; 12647 } 12648 12649 /** 12650 * Amount by which to extend the top fading region. Called only when 12651 * {@link #isPaddingOffsetRequired()} returns true. 12652 * 12653 * @return The top padding offset in pixels. 12654 * 12655 * @see #isPaddingOffsetRequired() 12656 * 12657 * @since CURRENT 12658 */ 12659 protected int getTopPaddingOffset() { 12660 return 0; 12661 } 12662 12663 /** 12664 * Amount by which to extend the bottom fading region. Called only when 12665 * {@link #isPaddingOffsetRequired()} returns true. 12666 * 12667 * @return The bottom padding offset in pixels. 12668 * 12669 * @see #isPaddingOffsetRequired() 12670 * 12671 * @since CURRENT 12672 */ 12673 protected int getBottomPaddingOffset() { 12674 return 0; 12675 } 12676 12677 /** 12678 * @hide 12679 * @param offsetRequired 12680 */ 12681 protected int getFadeTop(boolean offsetRequired) { 12682 int top = mPaddingTop; 12683 if (offsetRequired) top += getTopPaddingOffset(); 12684 return top; 12685 } 12686 12687 /** 12688 * @hide 12689 * @param offsetRequired 12690 */ 12691 protected int getFadeHeight(boolean offsetRequired) { 12692 int padding = mPaddingTop; 12693 if (offsetRequired) padding += getTopPaddingOffset(); 12694 return mBottom - mTop - mPaddingBottom - padding; 12695 } 12696 12697 /** 12698 * <p>Indicates whether this view is attached to a hardware accelerated 12699 * window or not.</p> 12700 * 12701 * <p>Even if this method returns true, it does not mean that every call 12702 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12703 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12704 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12705 * window is hardware accelerated, 12706 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12707 * return false, and this method will return true.</p> 12708 * 12709 * @return True if the view is attached to a window and the window is 12710 * hardware accelerated; false in any other case. 12711 */ 12712 public boolean isHardwareAccelerated() { 12713 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12714 } 12715 12716 /** 12717 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12718 * case of an active Animation being run on the view. 12719 */ 12720 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12721 Animation a, boolean scalingRequired) { 12722 Transformation invalidationTransform; 12723 final int flags = parent.mGroupFlags; 12724 final boolean initialized = a.isInitialized(); 12725 if (!initialized) { 12726 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12727 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12728 onAnimationStart(); 12729 } 12730 12731 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12732 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12733 if (parent.mInvalidationTransformation == null) { 12734 parent.mInvalidationTransformation = new Transformation(); 12735 } 12736 invalidationTransform = parent.mInvalidationTransformation; 12737 a.getTransformation(drawingTime, invalidationTransform, 1f); 12738 } else { 12739 invalidationTransform = parent.mChildTransformation; 12740 } 12741 if (more) { 12742 if (!a.willChangeBounds()) { 12743 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12744 parent.FLAG_OPTIMIZE_INVALIDATE) { 12745 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12746 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12747 // The child need to draw an animation, potentially offscreen, so 12748 // make sure we do not cancel invalidate requests 12749 parent.mPrivateFlags |= DRAW_ANIMATION; 12750 parent.invalidate(mLeft, mTop, mRight, mBottom); 12751 } 12752 } else { 12753 if (parent.mInvalidateRegion == null) { 12754 parent.mInvalidateRegion = new RectF(); 12755 } 12756 final RectF region = parent.mInvalidateRegion; 12757 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12758 invalidationTransform); 12759 12760 // The child need to draw an animation, potentially offscreen, so 12761 // make sure we do not cancel invalidate requests 12762 parent.mPrivateFlags |= DRAW_ANIMATION; 12763 12764 final int left = mLeft + (int) region.left; 12765 final int top = mTop + (int) region.top; 12766 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12767 top + (int) (region.height() + .5f)); 12768 } 12769 } 12770 return more; 12771 } 12772 12773 /** 12774 * This method is called by getDisplayList() when a display list is created or re-rendered. 12775 * It sets or resets the current value of all properties on that display list (resetting is 12776 * necessary when a display list is being re-created, because we need to make sure that 12777 * previously-set transform values 12778 */ 12779 void setDisplayListProperties(DisplayList displayList) { 12780 if (displayList != null) { 12781 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12782 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12783 if (mParent instanceof ViewGroup) { 12784 displayList.setClipChildren( 12785 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12786 } 12787 float alpha = 1; 12788 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12789 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12790 ViewGroup parentVG = (ViewGroup) mParent; 12791 final boolean hasTransform = 12792 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12793 if (hasTransform) { 12794 Transformation transform = parentVG.mChildTransformation; 12795 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12796 if (transformType != Transformation.TYPE_IDENTITY) { 12797 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12798 alpha = transform.getAlpha(); 12799 } 12800 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12801 displayList.setStaticMatrix(transform.getMatrix()); 12802 } 12803 } 12804 } 12805 } 12806 if (mTransformationInfo != null) { 12807 alpha *= mTransformationInfo.mAlpha; 12808 if (alpha < 1) { 12809 final int multipliedAlpha = (int) (255 * alpha); 12810 if (onSetAlpha(multipliedAlpha)) { 12811 alpha = 1; 12812 } 12813 } 12814 displayList.setTransformationInfo(alpha, 12815 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12816 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12817 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12818 mTransformationInfo.mScaleY); 12819 if (mTransformationInfo.mCamera == null) { 12820 mTransformationInfo.mCamera = new Camera(); 12821 mTransformationInfo.matrix3D = new Matrix(); 12822 } 12823 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12824 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12825 displayList.setPivotX(getPivotX()); 12826 displayList.setPivotY(getPivotY()); 12827 } 12828 } else if (alpha < 1) { 12829 displayList.setAlpha(alpha); 12830 } 12831 } 12832 } 12833 12834 /** 12835 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12836 * This draw() method is an implementation detail and is not intended to be overridden or 12837 * to be called from anywhere else other than ViewGroup.drawChild(). 12838 */ 12839 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12840 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12841 boolean more = false; 12842 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12843 final int flags = parent.mGroupFlags; 12844 12845 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12846 parent.mChildTransformation.clear(); 12847 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12848 } 12849 12850 Transformation transformToApply = null; 12851 boolean concatMatrix = false; 12852 12853 boolean scalingRequired = false; 12854 boolean caching; 12855 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 12856 12857 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12858 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12859 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12860 caching = true; 12861 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12862 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12863 } else { 12864 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12865 } 12866 12867 final Animation a = getAnimation(); 12868 if (a != null) { 12869 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12870 concatMatrix = a.willChangeTransformationMatrix(); 12871 if (concatMatrix) { 12872 mPrivateFlags2 |= VIEW_IS_ANIMATING_TRANSFORM; 12873 } 12874 transformToApply = parent.mChildTransformation; 12875 } else { 12876 if ((mPrivateFlags2 & VIEW_IS_ANIMATING_TRANSFORM) == VIEW_IS_ANIMATING_TRANSFORM && 12877 mDisplayList != null) { 12878 // No longer animating: clear out old animation matrix 12879 mDisplayList.setAnimationMatrix(null); 12880 mPrivateFlags2 &= ~VIEW_IS_ANIMATING_TRANSFORM; 12881 } 12882 if (!useDisplayListProperties && 12883 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12884 final boolean hasTransform = 12885 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12886 if (hasTransform) { 12887 final int transformType = parent.mChildTransformation.getTransformationType(); 12888 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12889 parent.mChildTransformation : null; 12890 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12891 } 12892 } 12893 } 12894 12895 concatMatrix |= !childHasIdentityMatrix; 12896 12897 // Sets the flag as early as possible to allow draw() implementations 12898 // to call invalidate() successfully when doing animations 12899 mPrivateFlags |= DRAWN; 12900 12901 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12902 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12903 mPrivateFlags2 |= VIEW_QUICK_REJECTED; 12904 return more; 12905 } 12906 mPrivateFlags2 &= ~VIEW_QUICK_REJECTED; 12907 12908 if (hardwareAccelerated) { 12909 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12910 // retain the flag's value temporarily in the mRecreateDisplayList flag 12911 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12912 mPrivateFlags &= ~INVALIDATED; 12913 } 12914 12915 computeScroll(); 12916 12917 final int sx = mScrollX; 12918 final int sy = mScrollY; 12919 12920 DisplayList displayList = null; 12921 Bitmap cache = null; 12922 boolean hasDisplayList = false; 12923 if (caching) { 12924 if (!hardwareAccelerated) { 12925 if (layerType != LAYER_TYPE_NONE) { 12926 layerType = LAYER_TYPE_SOFTWARE; 12927 buildDrawingCache(true); 12928 } 12929 cache = getDrawingCache(true); 12930 } else { 12931 switch (layerType) { 12932 case LAYER_TYPE_SOFTWARE: 12933 if (useDisplayListProperties) { 12934 hasDisplayList = canHaveDisplayList(); 12935 } else { 12936 buildDrawingCache(true); 12937 cache = getDrawingCache(true); 12938 } 12939 break; 12940 case LAYER_TYPE_HARDWARE: 12941 if (useDisplayListProperties) { 12942 hasDisplayList = canHaveDisplayList(); 12943 } 12944 break; 12945 case LAYER_TYPE_NONE: 12946 // Delay getting the display list until animation-driven alpha values are 12947 // set up and possibly passed on to the view 12948 hasDisplayList = canHaveDisplayList(); 12949 break; 12950 } 12951 } 12952 } 12953 useDisplayListProperties &= hasDisplayList; 12954 if (useDisplayListProperties) { 12955 displayList = getDisplayList(); 12956 if (!displayList.isValid()) { 12957 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12958 // to getDisplayList(), the display list will be marked invalid and we should not 12959 // try to use it again. 12960 displayList = null; 12961 hasDisplayList = false; 12962 useDisplayListProperties = false; 12963 } 12964 } 12965 12966 final boolean hasNoCache = cache == null || hasDisplayList; 12967 final boolean offsetForScroll = cache == null && !hasDisplayList && 12968 layerType != LAYER_TYPE_HARDWARE; 12969 12970 int restoreTo = -1; 12971 if (!useDisplayListProperties || transformToApply != null) { 12972 restoreTo = canvas.save(); 12973 } 12974 if (offsetForScroll) { 12975 canvas.translate(mLeft - sx, mTop - sy); 12976 } else { 12977 if (!useDisplayListProperties) { 12978 canvas.translate(mLeft, mTop); 12979 } 12980 if (scalingRequired) { 12981 if (useDisplayListProperties) { 12982 // TODO: Might not need this if we put everything inside the DL 12983 restoreTo = canvas.save(); 12984 } 12985 // mAttachInfo cannot be null, otherwise scalingRequired == false 12986 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12987 canvas.scale(scale, scale); 12988 } 12989 } 12990 12991 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12992 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix()) { 12993 if (transformToApply != null || !childHasIdentityMatrix) { 12994 int transX = 0; 12995 int transY = 0; 12996 12997 if (offsetForScroll) { 12998 transX = -sx; 12999 transY = -sy; 13000 } 13001 13002 if (transformToApply != null) { 13003 if (concatMatrix) { 13004 if (useDisplayListProperties) { 13005 displayList.setAnimationMatrix(transformToApply.getMatrix()); 13006 } else { 13007 // Undo the scroll translation, apply the transformation matrix, 13008 // then redo the scroll translate to get the correct result. 13009 canvas.translate(-transX, -transY); 13010 canvas.concat(transformToApply.getMatrix()); 13011 canvas.translate(transX, transY); 13012 } 13013 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13014 } 13015 13016 float transformAlpha = transformToApply.getAlpha(); 13017 if (transformAlpha < 1) { 13018 alpha *= transformToApply.getAlpha(); 13019 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13020 } 13021 } 13022 13023 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13024 canvas.translate(-transX, -transY); 13025 canvas.concat(getMatrix()); 13026 canvas.translate(transX, transY); 13027 } 13028 } 13029 13030 if (alpha < 1) { 13031 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13032 if (hasNoCache) { 13033 final int multipliedAlpha = (int) (255 * alpha); 13034 if (!onSetAlpha(multipliedAlpha)) { 13035 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13036 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13037 layerType != LAYER_TYPE_NONE) { 13038 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13039 } 13040 if (useDisplayListProperties) { 13041 displayList.setAlpha(alpha * getAlpha()); 13042 } else if (layerType == LAYER_TYPE_NONE) { 13043 final int scrollX = hasDisplayList ? 0 : sx; 13044 final int scrollY = hasDisplayList ? 0 : sy; 13045 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13046 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13047 } 13048 } else { 13049 // Alpha is handled by the child directly, clobber the layer's alpha 13050 mPrivateFlags |= ALPHA_SET; 13051 } 13052 } 13053 } 13054 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13055 onSetAlpha(255); 13056 mPrivateFlags &= ~ALPHA_SET; 13057 } 13058 13059 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13060 !useDisplayListProperties) { 13061 if (offsetForScroll) { 13062 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13063 } else { 13064 if (!scalingRequired || cache == null) { 13065 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13066 } else { 13067 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13068 } 13069 } 13070 } 13071 13072 if (!useDisplayListProperties && hasDisplayList) { 13073 displayList = getDisplayList(); 13074 if (!displayList.isValid()) { 13075 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13076 // to getDisplayList(), the display list will be marked invalid and we should not 13077 // try to use it again. 13078 displayList = null; 13079 hasDisplayList = false; 13080 } 13081 } 13082 13083 if (hasNoCache) { 13084 boolean layerRendered = false; 13085 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13086 final HardwareLayer layer = getHardwareLayer(); 13087 if (layer != null && layer.isValid()) { 13088 mLayerPaint.setAlpha((int) (alpha * 255)); 13089 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13090 layerRendered = true; 13091 } else { 13092 final int scrollX = hasDisplayList ? 0 : sx; 13093 final int scrollY = hasDisplayList ? 0 : sy; 13094 canvas.saveLayer(scrollX, scrollY, 13095 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13096 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13097 } 13098 } 13099 13100 if (!layerRendered) { 13101 if (!hasDisplayList) { 13102 // Fast path for layouts with no backgrounds 13103 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 13104 mPrivateFlags &= ~DIRTY_MASK; 13105 dispatchDraw(canvas); 13106 } else { 13107 draw(canvas); 13108 } 13109 } else { 13110 mPrivateFlags &= ~DIRTY_MASK; 13111 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13112 } 13113 } 13114 } else if (cache != null) { 13115 mPrivateFlags &= ~DIRTY_MASK; 13116 Paint cachePaint; 13117 13118 if (layerType == LAYER_TYPE_NONE) { 13119 cachePaint = parent.mCachePaint; 13120 if (cachePaint == null) { 13121 cachePaint = new Paint(); 13122 cachePaint.setDither(false); 13123 parent.mCachePaint = cachePaint; 13124 } 13125 if (alpha < 1) { 13126 cachePaint.setAlpha((int) (alpha * 255)); 13127 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13128 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13129 cachePaint.setAlpha(255); 13130 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13131 } 13132 } else { 13133 cachePaint = mLayerPaint; 13134 cachePaint.setAlpha((int) (alpha * 255)); 13135 } 13136 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13137 } 13138 13139 if (restoreTo >= 0) { 13140 canvas.restoreToCount(restoreTo); 13141 } 13142 13143 if (a != null && !more) { 13144 if (!hardwareAccelerated && !a.getFillAfter()) { 13145 onSetAlpha(255); 13146 } 13147 parent.finishAnimatingView(this, a); 13148 } 13149 13150 if (more && hardwareAccelerated) { 13151 // invalidation is the trigger to recreate display lists, so if we're using 13152 // display lists to render, force an invalidate to allow the animation to 13153 // continue drawing another frame 13154 parent.invalidate(true); 13155 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13156 // alpha animations should cause the child to recreate its display list 13157 invalidate(true); 13158 } 13159 } 13160 13161 mRecreateDisplayList = false; 13162 13163 return more; 13164 } 13165 13166 /** 13167 * Manually render this view (and all of its children) to the given Canvas. 13168 * The view must have already done a full layout before this function is 13169 * called. When implementing a view, implement 13170 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13171 * If you do need to override this method, call the superclass version. 13172 * 13173 * @param canvas The Canvas to which the View is rendered. 13174 */ 13175 public void draw(Canvas canvas) { 13176 final int privateFlags = mPrivateFlags; 13177 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 13178 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13179 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 13180 13181 /* 13182 * Draw traversal performs several drawing steps which must be executed 13183 * in the appropriate order: 13184 * 13185 * 1. Draw the background 13186 * 2. If necessary, save the canvas' layers to prepare for fading 13187 * 3. Draw view's content 13188 * 4. Draw children 13189 * 5. If necessary, draw the fading edges and restore layers 13190 * 6. Draw decorations (scrollbars for instance) 13191 */ 13192 13193 // Step 1, draw the background, if needed 13194 int saveCount; 13195 13196 if (!dirtyOpaque) { 13197 final Drawable background = mBackground; 13198 if (background != null) { 13199 final int scrollX = mScrollX; 13200 final int scrollY = mScrollY; 13201 13202 if (mBackgroundSizeChanged) { 13203 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13204 mBackgroundSizeChanged = false; 13205 } 13206 13207 if ((scrollX | scrollY) == 0) { 13208 background.draw(canvas); 13209 } else { 13210 canvas.translate(scrollX, scrollY); 13211 background.draw(canvas); 13212 canvas.translate(-scrollX, -scrollY); 13213 } 13214 } 13215 } 13216 13217 // skip step 2 & 5 if possible (common case) 13218 final int viewFlags = mViewFlags; 13219 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13220 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13221 if (!verticalEdges && !horizontalEdges) { 13222 // Step 3, draw the content 13223 if (!dirtyOpaque) onDraw(canvas); 13224 13225 // Step 4, draw the children 13226 dispatchDraw(canvas); 13227 13228 // Step 6, draw decorations (scrollbars) 13229 onDrawScrollBars(canvas); 13230 13231 // we're done... 13232 return; 13233 } 13234 13235 /* 13236 * Here we do the full fledged routine... 13237 * (this is an uncommon case where speed matters less, 13238 * this is why we repeat some of the tests that have been 13239 * done above) 13240 */ 13241 13242 boolean drawTop = false; 13243 boolean drawBottom = false; 13244 boolean drawLeft = false; 13245 boolean drawRight = false; 13246 13247 float topFadeStrength = 0.0f; 13248 float bottomFadeStrength = 0.0f; 13249 float leftFadeStrength = 0.0f; 13250 float rightFadeStrength = 0.0f; 13251 13252 // Step 2, save the canvas' layers 13253 int paddingLeft = mPaddingLeft; 13254 13255 final boolean offsetRequired = isPaddingOffsetRequired(); 13256 if (offsetRequired) { 13257 paddingLeft += getLeftPaddingOffset(); 13258 } 13259 13260 int left = mScrollX + paddingLeft; 13261 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13262 int top = mScrollY + getFadeTop(offsetRequired); 13263 int bottom = top + getFadeHeight(offsetRequired); 13264 13265 if (offsetRequired) { 13266 right += getRightPaddingOffset(); 13267 bottom += getBottomPaddingOffset(); 13268 } 13269 13270 final ScrollabilityCache scrollabilityCache = mScrollCache; 13271 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13272 int length = (int) fadeHeight; 13273 13274 // clip the fade length if top and bottom fades overlap 13275 // overlapping fades produce odd-looking artifacts 13276 if (verticalEdges && (top + length > bottom - length)) { 13277 length = (bottom - top) / 2; 13278 } 13279 13280 // also clip horizontal fades if necessary 13281 if (horizontalEdges && (left + length > right - length)) { 13282 length = (right - left) / 2; 13283 } 13284 13285 if (verticalEdges) { 13286 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13287 drawTop = topFadeStrength * fadeHeight > 1.0f; 13288 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13289 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13290 } 13291 13292 if (horizontalEdges) { 13293 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13294 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13295 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13296 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13297 } 13298 13299 saveCount = canvas.getSaveCount(); 13300 13301 int solidColor = getSolidColor(); 13302 if (solidColor == 0) { 13303 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13304 13305 if (drawTop) { 13306 canvas.saveLayer(left, top, right, top + length, null, flags); 13307 } 13308 13309 if (drawBottom) { 13310 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13311 } 13312 13313 if (drawLeft) { 13314 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13315 } 13316 13317 if (drawRight) { 13318 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13319 } 13320 } else { 13321 scrollabilityCache.setFadeColor(solidColor); 13322 } 13323 13324 // Step 3, draw the content 13325 if (!dirtyOpaque) onDraw(canvas); 13326 13327 // Step 4, draw the children 13328 dispatchDraw(canvas); 13329 13330 // Step 5, draw the fade effect and restore layers 13331 final Paint p = scrollabilityCache.paint; 13332 final Matrix matrix = scrollabilityCache.matrix; 13333 final Shader fade = scrollabilityCache.shader; 13334 13335 if (drawTop) { 13336 matrix.setScale(1, fadeHeight * topFadeStrength); 13337 matrix.postTranslate(left, top); 13338 fade.setLocalMatrix(matrix); 13339 canvas.drawRect(left, top, right, top + length, p); 13340 } 13341 13342 if (drawBottom) { 13343 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13344 matrix.postRotate(180); 13345 matrix.postTranslate(left, bottom); 13346 fade.setLocalMatrix(matrix); 13347 canvas.drawRect(left, bottom - length, right, bottom, p); 13348 } 13349 13350 if (drawLeft) { 13351 matrix.setScale(1, fadeHeight * leftFadeStrength); 13352 matrix.postRotate(-90); 13353 matrix.postTranslate(left, top); 13354 fade.setLocalMatrix(matrix); 13355 canvas.drawRect(left, top, left + length, bottom, p); 13356 } 13357 13358 if (drawRight) { 13359 matrix.setScale(1, fadeHeight * rightFadeStrength); 13360 matrix.postRotate(90); 13361 matrix.postTranslate(right, top); 13362 fade.setLocalMatrix(matrix); 13363 canvas.drawRect(right - length, top, right, bottom, p); 13364 } 13365 13366 canvas.restoreToCount(saveCount); 13367 13368 // Step 6, draw decorations (scrollbars) 13369 onDrawScrollBars(canvas); 13370 } 13371 13372 /** 13373 * Override this if your view is known to always be drawn on top of a solid color background, 13374 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13375 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13376 * should be set to 0xFF. 13377 * 13378 * @see #setVerticalFadingEdgeEnabled(boolean) 13379 * @see #setHorizontalFadingEdgeEnabled(boolean) 13380 * 13381 * @return The known solid color background for this view, or 0 if the color may vary 13382 */ 13383 @ViewDebug.ExportedProperty(category = "drawing") 13384 public int getSolidColor() { 13385 return 0; 13386 } 13387 13388 /** 13389 * Build a human readable string representation of the specified view flags. 13390 * 13391 * @param flags the view flags to convert to a string 13392 * @return a String representing the supplied flags 13393 */ 13394 private static String printFlags(int flags) { 13395 String output = ""; 13396 int numFlags = 0; 13397 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13398 output += "TAKES_FOCUS"; 13399 numFlags++; 13400 } 13401 13402 switch (flags & VISIBILITY_MASK) { 13403 case INVISIBLE: 13404 if (numFlags > 0) { 13405 output += " "; 13406 } 13407 output += "INVISIBLE"; 13408 // USELESS HERE numFlags++; 13409 break; 13410 case GONE: 13411 if (numFlags > 0) { 13412 output += " "; 13413 } 13414 output += "GONE"; 13415 // USELESS HERE numFlags++; 13416 break; 13417 default: 13418 break; 13419 } 13420 return output; 13421 } 13422 13423 /** 13424 * Build a human readable string representation of the specified private 13425 * view flags. 13426 * 13427 * @param privateFlags the private view flags to convert to a string 13428 * @return a String representing the supplied flags 13429 */ 13430 private static String printPrivateFlags(int privateFlags) { 13431 String output = ""; 13432 int numFlags = 0; 13433 13434 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13435 output += "WANTS_FOCUS"; 13436 numFlags++; 13437 } 13438 13439 if ((privateFlags & FOCUSED) == FOCUSED) { 13440 if (numFlags > 0) { 13441 output += " "; 13442 } 13443 output += "FOCUSED"; 13444 numFlags++; 13445 } 13446 13447 if ((privateFlags & SELECTED) == SELECTED) { 13448 if (numFlags > 0) { 13449 output += " "; 13450 } 13451 output += "SELECTED"; 13452 numFlags++; 13453 } 13454 13455 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13456 if (numFlags > 0) { 13457 output += " "; 13458 } 13459 output += "IS_ROOT_NAMESPACE"; 13460 numFlags++; 13461 } 13462 13463 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13464 if (numFlags > 0) { 13465 output += " "; 13466 } 13467 output += "HAS_BOUNDS"; 13468 numFlags++; 13469 } 13470 13471 if ((privateFlags & DRAWN) == DRAWN) { 13472 if (numFlags > 0) { 13473 output += " "; 13474 } 13475 output += "DRAWN"; 13476 // USELESS HERE numFlags++; 13477 } 13478 return output; 13479 } 13480 13481 /** 13482 * <p>Indicates whether or not this view's layout will be requested during 13483 * the next hierarchy layout pass.</p> 13484 * 13485 * @return true if the layout will be forced during next layout pass 13486 */ 13487 public boolean isLayoutRequested() { 13488 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13489 } 13490 13491 /** 13492 * Assign a size and position to a view and all of its 13493 * descendants 13494 * 13495 * <p>This is the second phase of the layout mechanism. 13496 * (The first is measuring). In this phase, each parent calls 13497 * layout on all of its children to position them. 13498 * This is typically done using the child measurements 13499 * that were stored in the measure pass().</p> 13500 * 13501 * <p>Derived classes should not override this method. 13502 * Derived classes with children should override 13503 * onLayout. In that method, they should 13504 * call layout on each of their children.</p> 13505 * 13506 * @param l Left position, relative to parent 13507 * @param t Top position, relative to parent 13508 * @param r Right position, relative to parent 13509 * @param b Bottom position, relative to parent 13510 */ 13511 @SuppressWarnings({"unchecked"}) 13512 public void layout(int l, int t, int r, int b) { 13513 int oldL = mLeft; 13514 int oldT = mTop; 13515 int oldB = mBottom; 13516 int oldR = mRight; 13517 boolean changed = setFrame(l, t, r, b); 13518 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13519 onLayout(changed, l, t, r, b); 13520 mPrivateFlags &= ~LAYOUT_REQUIRED; 13521 13522 ListenerInfo li = mListenerInfo; 13523 if (li != null && li.mOnLayoutChangeListeners != null) { 13524 ArrayList<OnLayoutChangeListener> listenersCopy = 13525 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13526 int numListeners = listenersCopy.size(); 13527 for (int i = 0; i < numListeners; ++i) { 13528 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13529 } 13530 } 13531 } 13532 mPrivateFlags &= ~FORCE_LAYOUT; 13533 } 13534 13535 /** 13536 * Called from layout when this view should 13537 * assign a size and position to each of its children. 13538 * 13539 * Derived classes with children should override 13540 * this method and call layout on each of 13541 * their children. 13542 * @param changed This is a new size or position for this view 13543 * @param left Left position, relative to parent 13544 * @param top Top position, relative to parent 13545 * @param right Right position, relative to parent 13546 * @param bottom Bottom position, relative to parent 13547 */ 13548 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13549 } 13550 13551 /** 13552 * Assign a size and position to this view. 13553 * 13554 * This is called from layout. 13555 * 13556 * @param left Left position, relative to parent 13557 * @param top Top position, relative to parent 13558 * @param right Right position, relative to parent 13559 * @param bottom Bottom position, relative to parent 13560 * @return true if the new size and position are different than the 13561 * previous ones 13562 * {@hide} 13563 */ 13564 protected boolean setFrame(int left, int top, int right, int bottom) { 13565 boolean changed = false; 13566 13567 if (DBG) { 13568 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13569 + right + "," + bottom + ")"); 13570 } 13571 13572 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13573 changed = true; 13574 13575 // Remember our drawn bit 13576 int drawn = mPrivateFlags & DRAWN; 13577 13578 int oldWidth = mRight - mLeft; 13579 int oldHeight = mBottom - mTop; 13580 int newWidth = right - left; 13581 int newHeight = bottom - top; 13582 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13583 13584 // Invalidate our old position 13585 invalidate(sizeChanged); 13586 13587 mLeft = left; 13588 mTop = top; 13589 mRight = right; 13590 mBottom = bottom; 13591 if (mDisplayList != null) { 13592 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13593 } 13594 13595 mPrivateFlags |= HAS_BOUNDS; 13596 13597 13598 if (sizeChanged) { 13599 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13600 // A change in dimension means an auto-centered pivot point changes, too 13601 if (mTransformationInfo != null) { 13602 mTransformationInfo.mMatrixDirty = true; 13603 } 13604 } 13605 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13606 } 13607 13608 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13609 // If we are visible, force the DRAWN bit to on so that 13610 // this invalidate will go through (at least to our parent). 13611 // This is because someone may have invalidated this view 13612 // before this call to setFrame came in, thereby clearing 13613 // the DRAWN bit. 13614 mPrivateFlags |= DRAWN; 13615 invalidate(sizeChanged); 13616 // parent display list may need to be recreated based on a change in the bounds 13617 // of any child 13618 invalidateParentCaches(); 13619 } 13620 13621 // Reset drawn bit to original value (invalidate turns it off) 13622 mPrivateFlags |= drawn; 13623 13624 mBackgroundSizeChanged = true; 13625 } 13626 return changed; 13627 } 13628 13629 /** 13630 * Finalize inflating a view from XML. This is called as the last phase 13631 * of inflation, after all child views have been added. 13632 * 13633 * <p>Even if the subclass overrides onFinishInflate, they should always be 13634 * sure to call the super method, so that we get called. 13635 */ 13636 protected void onFinishInflate() { 13637 } 13638 13639 /** 13640 * Returns the resources associated with this view. 13641 * 13642 * @return Resources object. 13643 */ 13644 public Resources getResources() { 13645 return mResources; 13646 } 13647 13648 /** 13649 * Invalidates the specified Drawable. 13650 * 13651 * @param drawable the drawable to invalidate 13652 */ 13653 public void invalidateDrawable(Drawable drawable) { 13654 if (verifyDrawable(drawable)) { 13655 final Rect dirty = drawable.getBounds(); 13656 final int scrollX = mScrollX; 13657 final int scrollY = mScrollY; 13658 13659 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13660 dirty.right + scrollX, dirty.bottom + scrollY); 13661 } 13662 } 13663 13664 /** 13665 * Schedules an action on a drawable to occur at a specified time. 13666 * 13667 * @param who the recipient of the action 13668 * @param what the action to run on the drawable 13669 * @param when the time at which the action must occur. Uses the 13670 * {@link SystemClock#uptimeMillis} timebase. 13671 */ 13672 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13673 if (verifyDrawable(who) && what != null) { 13674 final long delay = when - SystemClock.uptimeMillis(); 13675 if (mAttachInfo != null) { 13676 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13677 Choreographer.CALLBACK_ANIMATION, what, who, 13678 Choreographer.subtractFrameDelay(delay)); 13679 } else { 13680 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13681 } 13682 } 13683 } 13684 13685 /** 13686 * Cancels a scheduled action on a drawable. 13687 * 13688 * @param who the recipient of the action 13689 * @param what the action to cancel 13690 */ 13691 public void unscheduleDrawable(Drawable who, Runnable what) { 13692 if (verifyDrawable(who) && what != null) { 13693 if (mAttachInfo != null) { 13694 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13695 Choreographer.CALLBACK_ANIMATION, what, who); 13696 } else { 13697 ViewRootImpl.getRunQueue().removeCallbacks(what); 13698 } 13699 } 13700 } 13701 13702 /** 13703 * Unschedule any events associated with the given Drawable. This can be 13704 * used when selecting a new Drawable into a view, so that the previous 13705 * one is completely unscheduled. 13706 * 13707 * @param who The Drawable to unschedule. 13708 * 13709 * @see #drawableStateChanged 13710 */ 13711 public void unscheduleDrawable(Drawable who) { 13712 if (mAttachInfo != null && who != null) { 13713 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13714 Choreographer.CALLBACK_ANIMATION, null, who); 13715 } 13716 } 13717 13718 /** 13719 * Return the layout direction of a given Drawable. 13720 * 13721 * @param who the Drawable to query 13722 * @hide 13723 */ 13724 public int getResolvedLayoutDirection(Drawable who) { 13725 return (who == mBackground) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 13726 } 13727 13728 /** 13729 * If your view subclass is displaying its own Drawable objects, it should 13730 * override this function and return true for any Drawable it is 13731 * displaying. This allows animations for those drawables to be 13732 * scheduled. 13733 * 13734 * <p>Be sure to call through to the super class when overriding this 13735 * function. 13736 * 13737 * @param who The Drawable to verify. Return true if it is one you are 13738 * displaying, else return the result of calling through to the 13739 * super class. 13740 * 13741 * @return boolean If true than the Drawable is being displayed in the 13742 * view; else false and it is not allowed to animate. 13743 * 13744 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13745 * @see #drawableStateChanged() 13746 */ 13747 protected boolean verifyDrawable(Drawable who) { 13748 return who == mBackground; 13749 } 13750 13751 /** 13752 * This function is called whenever the state of the view changes in such 13753 * a way that it impacts the state of drawables being shown. 13754 * 13755 * <p>Be sure to call through to the superclass when overriding this 13756 * function. 13757 * 13758 * @see Drawable#setState(int[]) 13759 */ 13760 protected void drawableStateChanged() { 13761 Drawable d = mBackground; 13762 if (d != null && d.isStateful()) { 13763 d.setState(getDrawableState()); 13764 } 13765 } 13766 13767 /** 13768 * Call this to force a view to update its drawable state. This will cause 13769 * drawableStateChanged to be called on this view. Views that are interested 13770 * in the new state should call getDrawableState. 13771 * 13772 * @see #drawableStateChanged 13773 * @see #getDrawableState 13774 */ 13775 public void refreshDrawableState() { 13776 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13777 drawableStateChanged(); 13778 13779 ViewParent parent = mParent; 13780 if (parent != null) { 13781 parent.childDrawableStateChanged(this); 13782 } 13783 } 13784 13785 /** 13786 * Return an array of resource IDs of the drawable states representing the 13787 * current state of the view. 13788 * 13789 * @return The current drawable state 13790 * 13791 * @see Drawable#setState(int[]) 13792 * @see #drawableStateChanged() 13793 * @see #onCreateDrawableState(int) 13794 */ 13795 public final int[] getDrawableState() { 13796 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13797 return mDrawableState; 13798 } else { 13799 mDrawableState = onCreateDrawableState(0); 13800 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13801 return mDrawableState; 13802 } 13803 } 13804 13805 /** 13806 * Generate the new {@link android.graphics.drawable.Drawable} state for 13807 * this view. This is called by the view 13808 * system when the cached Drawable state is determined to be invalid. To 13809 * retrieve the current state, you should use {@link #getDrawableState}. 13810 * 13811 * @param extraSpace if non-zero, this is the number of extra entries you 13812 * would like in the returned array in which you can place your own 13813 * states. 13814 * 13815 * @return Returns an array holding the current {@link Drawable} state of 13816 * the view. 13817 * 13818 * @see #mergeDrawableStates(int[], int[]) 13819 */ 13820 protected int[] onCreateDrawableState(int extraSpace) { 13821 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13822 mParent instanceof View) { 13823 return ((View) mParent).onCreateDrawableState(extraSpace); 13824 } 13825 13826 int[] drawableState; 13827 13828 int privateFlags = mPrivateFlags; 13829 13830 int viewStateIndex = 0; 13831 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13832 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13833 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13834 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13835 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13836 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13837 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13838 HardwareRenderer.isAvailable()) { 13839 // This is set if HW acceleration is requested, even if the current 13840 // process doesn't allow it. This is just to allow app preview 13841 // windows to better match their app. 13842 viewStateIndex |= VIEW_STATE_ACCELERATED; 13843 } 13844 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13845 13846 final int privateFlags2 = mPrivateFlags2; 13847 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13848 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13849 13850 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13851 13852 //noinspection ConstantIfStatement 13853 if (false) { 13854 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13855 Log.i("View", toString() 13856 + " pressed=" + ((privateFlags & PRESSED) != 0) 13857 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13858 + " fo=" + hasFocus() 13859 + " sl=" + ((privateFlags & SELECTED) != 0) 13860 + " wf=" + hasWindowFocus() 13861 + ": " + Arrays.toString(drawableState)); 13862 } 13863 13864 if (extraSpace == 0) { 13865 return drawableState; 13866 } 13867 13868 final int[] fullState; 13869 if (drawableState != null) { 13870 fullState = new int[drawableState.length + extraSpace]; 13871 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13872 } else { 13873 fullState = new int[extraSpace]; 13874 } 13875 13876 return fullState; 13877 } 13878 13879 /** 13880 * Merge your own state values in <var>additionalState</var> into the base 13881 * state values <var>baseState</var> that were returned by 13882 * {@link #onCreateDrawableState(int)}. 13883 * 13884 * @param baseState The base state values returned by 13885 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13886 * own additional state values. 13887 * 13888 * @param additionalState The additional state values you would like 13889 * added to <var>baseState</var>; this array is not modified. 13890 * 13891 * @return As a convenience, the <var>baseState</var> array you originally 13892 * passed into the function is returned. 13893 * 13894 * @see #onCreateDrawableState(int) 13895 */ 13896 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13897 final int N = baseState.length; 13898 int i = N - 1; 13899 while (i >= 0 && baseState[i] == 0) { 13900 i--; 13901 } 13902 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13903 return baseState; 13904 } 13905 13906 /** 13907 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13908 * on all Drawable objects associated with this view. 13909 */ 13910 public void jumpDrawablesToCurrentState() { 13911 if (mBackground != null) { 13912 mBackground.jumpToCurrentState(); 13913 } 13914 } 13915 13916 /** 13917 * Sets the background color for this view. 13918 * @param color the color of the background 13919 */ 13920 @RemotableViewMethod 13921 public void setBackgroundColor(int color) { 13922 if (mBackground instanceof ColorDrawable) { 13923 ((ColorDrawable) mBackground).setColor(color); 13924 } else { 13925 setBackground(new ColorDrawable(color)); 13926 } 13927 } 13928 13929 /** 13930 * Set the background to a given resource. The resource should refer to 13931 * a Drawable object or 0 to remove the background. 13932 * @param resid The identifier of the resource. 13933 * 13934 * @attr ref android.R.styleable#View_background 13935 */ 13936 @RemotableViewMethod 13937 public void setBackgroundResource(int resid) { 13938 if (resid != 0 && resid == mBackgroundResource) { 13939 return; 13940 } 13941 13942 Drawable d= null; 13943 if (resid != 0) { 13944 d = mResources.getDrawable(resid); 13945 } 13946 setBackground(d); 13947 13948 mBackgroundResource = resid; 13949 } 13950 13951 /** 13952 * Set the background to a given Drawable, or remove the background. If the 13953 * background has padding, this View's padding is set to the background's 13954 * padding. However, when a background is removed, this View's padding isn't 13955 * touched. If setting the padding is desired, please use 13956 * {@link #setPadding(int, int, int, int)}. 13957 * 13958 * @param background The Drawable to use as the background, or null to remove the 13959 * background 13960 */ 13961 public void setBackground(Drawable background) { 13962 //noinspection deprecation 13963 setBackgroundDrawable(background); 13964 } 13965 13966 /** 13967 * @deprecated use {@link #setBackground(Drawable)} instead 13968 */ 13969 @Deprecated 13970 public void setBackgroundDrawable(Drawable background) { 13971 if (background == mBackground) { 13972 return; 13973 } 13974 13975 boolean requestLayout = false; 13976 13977 mBackgroundResource = 0; 13978 13979 /* 13980 * Regardless of whether we're setting a new background or not, we want 13981 * to clear the previous drawable. 13982 */ 13983 if (mBackground != null) { 13984 mBackground.setCallback(null); 13985 unscheduleDrawable(mBackground); 13986 } 13987 13988 if (background != null) { 13989 Rect padding = sThreadLocal.get(); 13990 if (padding == null) { 13991 padding = new Rect(); 13992 sThreadLocal.set(padding); 13993 } 13994 if (background.getPadding(padding)) { 13995 switch (background.getResolvedLayoutDirectionSelf()) { 13996 case LAYOUT_DIRECTION_RTL: 13997 setPadding(padding.right, padding.top, padding.left, padding.bottom); 13998 break; 13999 case LAYOUT_DIRECTION_LTR: 14000 default: 14001 setPadding(padding.left, padding.top, padding.right, padding.bottom); 14002 } 14003 } 14004 14005 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14006 // if it has a different minimum size, we should layout again 14007 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14008 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14009 requestLayout = true; 14010 } 14011 14012 background.setCallback(this); 14013 if (background.isStateful()) { 14014 background.setState(getDrawableState()); 14015 } 14016 background.setVisible(getVisibility() == VISIBLE, false); 14017 mBackground = background; 14018 14019 if ((mPrivateFlags & SKIP_DRAW) != 0) { 14020 mPrivateFlags &= ~SKIP_DRAW; 14021 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 14022 requestLayout = true; 14023 } 14024 } else { 14025 /* Remove the background */ 14026 mBackground = null; 14027 14028 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 14029 /* 14030 * This view ONLY drew the background before and we're removing 14031 * the background, so now it won't draw anything 14032 * (hence we SKIP_DRAW) 14033 */ 14034 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 14035 mPrivateFlags |= SKIP_DRAW; 14036 } 14037 14038 /* 14039 * When the background is set, we try to apply its padding to this 14040 * View. When the background is removed, we don't touch this View's 14041 * padding. This is noted in the Javadocs. Hence, we don't need to 14042 * requestLayout(), the invalidate() below is sufficient. 14043 */ 14044 14045 // The old background's minimum size could have affected this 14046 // View's layout, so let's requestLayout 14047 requestLayout = true; 14048 } 14049 14050 computeOpaqueFlags(); 14051 14052 if (requestLayout) { 14053 requestLayout(); 14054 } 14055 14056 mBackgroundSizeChanged = true; 14057 invalidate(true); 14058 } 14059 14060 /** 14061 * Gets the background drawable 14062 * 14063 * @return The drawable used as the background for this view, if any. 14064 * 14065 * @see #setBackground(Drawable) 14066 * 14067 * @attr ref android.R.styleable#View_background 14068 */ 14069 public Drawable getBackground() { 14070 return mBackground; 14071 } 14072 14073 /** 14074 * Sets the padding. The view may add on the space required to display 14075 * the scrollbars, depending on the style and visibility of the scrollbars. 14076 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14077 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14078 * from the values set in this call. 14079 * 14080 * @attr ref android.R.styleable#View_padding 14081 * @attr ref android.R.styleable#View_paddingBottom 14082 * @attr ref android.R.styleable#View_paddingLeft 14083 * @attr ref android.R.styleable#View_paddingRight 14084 * @attr ref android.R.styleable#View_paddingTop 14085 * @param left the left padding in pixels 14086 * @param top the top padding in pixels 14087 * @param right the right padding in pixels 14088 * @param bottom the bottom padding in pixels 14089 */ 14090 public void setPadding(int left, int top, int right, int bottom) { 14091 mUserPaddingStart = -1; 14092 mUserPaddingEnd = -1; 14093 mUserPaddingRelative = false; 14094 14095 internalSetPadding(left, top, right, bottom); 14096 } 14097 14098 private void internalSetPadding(int left, int top, int right, int bottom) { 14099 mUserPaddingLeft = left; 14100 mUserPaddingRight = right; 14101 mUserPaddingBottom = bottom; 14102 14103 final int viewFlags = mViewFlags; 14104 boolean changed = false; 14105 14106 // Common case is there are no scroll bars. 14107 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14108 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14109 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14110 ? 0 : getVerticalScrollbarWidth(); 14111 switch (mVerticalScrollbarPosition) { 14112 case SCROLLBAR_POSITION_DEFAULT: 14113 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 14114 left += offset; 14115 } else { 14116 right += offset; 14117 } 14118 break; 14119 case SCROLLBAR_POSITION_RIGHT: 14120 right += offset; 14121 break; 14122 case SCROLLBAR_POSITION_LEFT: 14123 left += offset; 14124 break; 14125 } 14126 } 14127 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14128 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14129 ? 0 : getHorizontalScrollbarHeight(); 14130 } 14131 } 14132 14133 if (mPaddingLeft != left) { 14134 changed = true; 14135 mPaddingLeft = left; 14136 } 14137 if (mPaddingTop != top) { 14138 changed = true; 14139 mPaddingTop = top; 14140 } 14141 if (mPaddingRight != right) { 14142 changed = true; 14143 mPaddingRight = right; 14144 } 14145 if (mPaddingBottom != bottom) { 14146 changed = true; 14147 mPaddingBottom = bottom; 14148 } 14149 14150 if (changed) { 14151 requestLayout(); 14152 } 14153 } 14154 14155 /** 14156 * Sets the relative padding. The view may add on the space required to display 14157 * the scrollbars, depending on the style and visibility of the scrollbars. 14158 * from the values set in this call. 14159 * 14160 * @param start the start padding in pixels 14161 * @param top the top padding in pixels 14162 * @param end the end padding in pixels 14163 * @param bottom the bottom padding in pixels 14164 * @hide 14165 */ 14166 public void setPaddingRelative(int start, int top, int end, int bottom) { 14167 mUserPaddingStart = start; 14168 mUserPaddingEnd = end; 14169 mUserPaddingRelative = true; 14170 14171 switch(getResolvedLayoutDirection()) { 14172 case LAYOUT_DIRECTION_RTL: 14173 internalSetPadding(end, top, start, bottom); 14174 break; 14175 case LAYOUT_DIRECTION_LTR: 14176 default: 14177 internalSetPadding(start, top, end, bottom); 14178 } 14179 } 14180 14181 /** 14182 * Returns the top padding of this view. 14183 * 14184 * @return the top padding in pixels 14185 */ 14186 public int getPaddingTop() { 14187 return mPaddingTop; 14188 } 14189 14190 /** 14191 * Returns the bottom padding of this view. If there are inset and enabled 14192 * scrollbars, this value may include the space required to display the 14193 * scrollbars as well. 14194 * 14195 * @return the bottom padding in pixels 14196 */ 14197 public int getPaddingBottom() { 14198 return mPaddingBottom; 14199 } 14200 14201 /** 14202 * Returns the left padding of this view. If there are inset and enabled 14203 * scrollbars, this value may include the space required to display the 14204 * scrollbars as well. 14205 * 14206 * @return the left padding in pixels 14207 */ 14208 public int getPaddingLeft() { 14209 return mPaddingLeft; 14210 } 14211 14212 /** 14213 * Returns the start padding of this view depending on its resolved layout direction. 14214 * If there are inset and enabled scrollbars, this value may include the space 14215 * required to display the scrollbars as well. 14216 * 14217 * @return the start padding in pixels 14218 * @hide 14219 */ 14220 public int getPaddingStart() { 14221 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14222 mPaddingRight : mPaddingLeft; 14223 } 14224 14225 /** 14226 * Returns the right padding of this view. If there are inset and enabled 14227 * scrollbars, this value may include the space required to display the 14228 * scrollbars as well. 14229 * 14230 * @return the right padding in pixels 14231 */ 14232 public int getPaddingRight() { 14233 return mPaddingRight; 14234 } 14235 14236 /** 14237 * Returns the end padding of this view depending on its resolved layout direction. 14238 * If there are inset and enabled scrollbars, this value may include the space 14239 * required to display the scrollbars as well. 14240 * 14241 * @return the end padding in pixels 14242 * @hide 14243 */ 14244 public int getPaddingEnd() { 14245 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14246 mPaddingLeft : mPaddingRight; 14247 } 14248 14249 /** 14250 * Return if the padding as been set thru relative values 14251 * {@link #setPaddingRelative(int, int, int, int)} 14252 * 14253 * @return true if the padding is relative or false if it is not. 14254 * @hide 14255 */ 14256 public boolean isPaddingRelative() { 14257 return mUserPaddingRelative; 14258 } 14259 14260 /** 14261 * @hide 14262 */ 14263 public Insets getOpticalInsets() { 14264 if (mLayoutInsets == null) { 14265 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 14266 } 14267 return mLayoutInsets; 14268 } 14269 14270 /** 14271 * @hide 14272 */ 14273 public void setLayoutInsets(Insets layoutInsets) { 14274 mLayoutInsets = layoutInsets; 14275 } 14276 14277 /** 14278 * Changes the selection state of this view. A view can be selected or not. 14279 * Note that selection is not the same as focus. Views are typically 14280 * selected in the context of an AdapterView like ListView or GridView; 14281 * the selected view is the view that is highlighted. 14282 * 14283 * @param selected true if the view must be selected, false otherwise 14284 */ 14285 public void setSelected(boolean selected) { 14286 if (((mPrivateFlags & SELECTED) != 0) != selected) { 14287 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 14288 if (!selected) resetPressedState(); 14289 invalidate(true); 14290 refreshDrawableState(); 14291 dispatchSetSelected(selected); 14292 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14293 notifyAccessibilityStateChanged(); 14294 } 14295 } 14296 } 14297 14298 /** 14299 * Dispatch setSelected to all of this View's children. 14300 * 14301 * @see #setSelected(boolean) 14302 * 14303 * @param selected The new selected state 14304 */ 14305 protected void dispatchSetSelected(boolean selected) { 14306 } 14307 14308 /** 14309 * Indicates the selection state of this view. 14310 * 14311 * @return true if the view is selected, false otherwise 14312 */ 14313 @ViewDebug.ExportedProperty 14314 public boolean isSelected() { 14315 return (mPrivateFlags & SELECTED) != 0; 14316 } 14317 14318 /** 14319 * Changes the activated state of this view. A view can be activated or not. 14320 * Note that activation is not the same as selection. Selection is 14321 * a transient property, representing the view (hierarchy) the user is 14322 * currently interacting with. Activation is a longer-term state that the 14323 * user can move views in and out of. For example, in a list view with 14324 * single or multiple selection enabled, the views in the current selection 14325 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14326 * here.) The activated state is propagated down to children of the view it 14327 * is set on. 14328 * 14329 * @param activated true if the view must be activated, false otherwise 14330 */ 14331 public void setActivated(boolean activated) { 14332 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 14333 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 14334 invalidate(true); 14335 refreshDrawableState(); 14336 dispatchSetActivated(activated); 14337 } 14338 } 14339 14340 /** 14341 * Dispatch setActivated to all of this View's children. 14342 * 14343 * @see #setActivated(boolean) 14344 * 14345 * @param activated The new activated state 14346 */ 14347 protected void dispatchSetActivated(boolean activated) { 14348 } 14349 14350 /** 14351 * Indicates the activation state of this view. 14352 * 14353 * @return true if the view is activated, false otherwise 14354 */ 14355 @ViewDebug.ExportedProperty 14356 public boolean isActivated() { 14357 return (mPrivateFlags & ACTIVATED) != 0; 14358 } 14359 14360 /** 14361 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14362 * observer can be used to get notifications when global events, like 14363 * layout, happen. 14364 * 14365 * The returned ViewTreeObserver observer is not guaranteed to remain 14366 * valid for the lifetime of this View. If the caller of this method keeps 14367 * a long-lived reference to ViewTreeObserver, it should always check for 14368 * the return value of {@link ViewTreeObserver#isAlive()}. 14369 * 14370 * @return The ViewTreeObserver for this view's hierarchy. 14371 */ 14372 public ViewTreeObserver getViewTreeObserver() { 14373 if (mAttachInfo != null) { 14374 return mAttachInfo.mTreeObserver; 14375 } 14376 if (mFloatingTreeObserver == null) { 14377 mFloatingTreeObserver = new ViewTreeObserver(); 14378 } 14379 return mFloatingTreeObserver; 14380 } 14381 14382 /** 14383 * <p>Finds the topmost view in the current view hierarchy.</p> 14384 * 14385 * @return the topmost view containing this view 14386 */ 14387 public View getRootView() { 14388 if (mAttachInfo != null) { 14389 final View v = mAttachInfo.mRootView; 14390 if (v != null) { 14391 return v; 14392 } 14393 } 14394 14395 View parent = this; 14396 14397 while (parent.mParent != null && parent.mParent instanceof View) { 14398 parent = (View) parent.mParent; 14399 } 14400 14401 return parent; 14402 } 14403 14404 /** 14405 * <p>Computes the coordinates of this view on the screen. The argument 14406 * must be an array of two integers. After the method returns, the array 14407 * contains the x and y location in that order.</p> 14408 * 14409 * @param location an array of two integers in which to hold the coordinates 14410 */ 14411 public void getLocationOnScreen(int[] location) { 14412 getLocationInWindow(location); 14413 14414 final AttachInfo info = mAttachInfo; 14415 if (info != null) { 14416 location[0] += info.mWindowLeft; 14417 location[1] += info.mWindowTop; 14418 } 14419 } 14420 14421 /** 14422 * <p>Computes the coordinates of this view in its window. The argument 14423 * must be an array of two integers. After the method returns, the array 14424 * contains the x and y location in that order.</p> 14425 * 14426 * @param location an array of two integers in which to hold the coordinates 14427 */ 14428 public void getLocationInWindow(int[] location) { 14429 if (location == null || location.length < 2) { 14430 throw new IllegalArgumentException("location must be an array of two integers"); 14431 } 14432 14433 if (mAttachInfo == null) { 14434 // When the view is not attached to a window, this method does not make sense 14435 location[0] = location[1] = 0; 14436 return; 14437 } 14438 14439 float[] position = mAttachInfo.mTmpTransformLocation; 14440 position[0] = position[1] = 0.0f; 14441 14442 if (!hasIdentityMatrix()) { 14443 getMatrix().mapPoints(position); 14444 } 14445 14446 position[0] += mLeft; 14447 position[1] += mTop; 14448 14449 ViewParent viewParent = mParent; 14450 while (viewParent instanceof View) { 14451 final View view = (View) viewParent; 14452 14453 position[0] -= view.mScrollX; 14454 position[1] -= view.mScrollY; 14455 14456 if (!view.hasIdentityMatrix()) { 14457 view.getMatrix().mapPoints(position); 14458 } 14459 14460 position[0] += view.mLeft; 14461 position[1] += view.mTop; 14462 14463 viewParent = view.mParent; 14464 } 14465 14466 if (viewParent instanceof ViewRootImpl) { 14467 // *cough* 14468 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14469 position[1] -= vr.mCurScrollY; 14470 } 14471 14472 location[0] = (int) (position[0] + 0.5f); 14473 location[1] = (int) (position[1] + 0.5f); 14474 } 14475 14476 /** 14477 * {@hide} 14478 * @param id the id of the view to be found 14479 * @return the view of the specified id, null if cannot be found 14480 */ 14481 protected View findViewTraversal(int id) { 14482 if (id == mID) { 14483 return this; 14484 } 14485 return null; 14486 } 14487 14488 /** 14489 * {@hide} 14490 * @param tag the tag of the view to be found 14491 * @return the view of specified tag, null if cannot be found 14492 */ 14493 protected View findViewWithTagTraversal(Object tag) { 14494 if (tag != null && tag.equals(mTag)) { 14495 return this; 14496 } 14497 return null; 14498 } 14499 14500 /** 14501 * {@hide} 14502 * @param predicate The predicate to evaluate. 14503 * @param childToSkip If not null, ignores this child during the recursive traversal. 14504 * @return The first view that matches the predicate or null. 14505 */ 14506 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14507 if (predicate.apply(this)) { 14508 return this; 14509 } 14510 return null; 14511 } 14512 14513 /** 14514 * Look for a child view with the given id. If this view has the given 14515 * id, return this view. 14516 * 14517 * @param id The id to search for. 14518 * @return The view that has the given id in the hierarchy or null 14519 */ 14520 public final View findViewById(int id) { 14521 if (id < 0) { 14522 return null; 14523 } 14524 return findViewTraversal(id); 14525 } 14526 14527 /** 14528 * Finds a view by its unuque and stable accessibility id. 14529 * 14530 * @param accessibilityId The searched accessibility id. 14531 * @return The found view. 14532 */ 14533 final View findViewByAccessibilityId(int accessibilityId) { 14534 if (accessibilityId < 0) { 14535 return null; 14536 } 14537 return findViewByAccessibilityIdTraversal(accessibilityId); 14538 } 14539 14540 /** 14541 * Performs the traversal to find a view by its unuque and stable accessibility id. 14542 * 14543 * <strong>Note:</strong>This method does not stop at the root namespace 14544 * boundary since the user can touch the screen at an arbitrary location 14545 * potentially crossing the root namespace bounday which will send an 14546 * accessibility event to accessibility services and they should be able 14547 * to obtain the event source. Also accessibility ids are guaranteed to be 14548 * unique in the window. 14549 * 14550 * @param accessibilityId The accessibility id. 14551 * @return The found view. 14552 */ 14553 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14554 if (getAccessibilityViewId() == accessibilityId) { 14555 return this; 14556 } 14557 return null; 14558 } 14559 14560 /** 14561 * Look for a child view with the given tag. If this view has the given 14562 * tag, return this view. 14563 * 14564 * @param tag The tag to search for, using "tag.equals(getTag())". 14565 * @return The View that has the given tag in the hierarchy or null 14566 */ 14567 public final View findViewWithTag(Object tag) { 14568 if (tag == null) { 14569 return null; 14570 } 14571 return findViewWithTagTraversal(tag); 14572 } 14573 14574 /** 14575 * {@hide} 14576 * Look for a child view that matches the specified predicate. 14577 * If this view matches the predicate, return this view. 14578 * 14579 * @param predicate The predicate to evaluate. 14580 * @return The first view that matches the predicate or null. 14581 */ 14582 public final View findViewByPredicate(Predicate<View> predicate) { 14583 return findViewByPredicateTraversal(predicate, null); 14584 } 14585 14586 /** 14587 * {@hide} 14588 * Look for a child view that matches the specified predicate, 14589 * starting with the specified view and its descendents and then 14590 * recusively searching the ancestors and siblings of that view 14591 * until this view is reached. 14592 * 14593 * This method is useful in cases where the predicate does not match 14594 * a single unique view (perhaps multiple views use the same id) 14595 * and we are trying to find the view that is "closest" in scope to the 14596 * starting view. 14597 * 14598 * @param start The view to start from. 14599 * @param predicate The predicate to evaluate. 14600 * @return The first view that matches the predicate or null. 14601 */ 14602 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14603 View childToSkip = null; 14604 for (;;) { 14605 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14606 if (view != null || start == this) { 14607 return view; 14608 } 14609 14610 ViewParent parent = start.getParent(); 14611 if (parent == null || !(parent instanceof View)) { 14612 return null; 14613 } 14614 14615 childToSkip = start; 14616 start = (View) parent; 14617 } 14618 } 14619 14620 /** 14621 * Sets the identifier for this view. The identifier does not have to be 14622 * unique in this view's hierarchy. The identifier should be a positive 14623 * number. 14624 * 14625 * @see #NO_ID 14626 * @see #getId() 14627 * @see #findViewById(int) 14628 * 14629 * @param id a number used to identify the view 14630 * 14631 * @attr ref android.R.styleable#View_id 14632 */ 14633 public void setId(int id) { 14634 mID = id; 14635 } 14636 14637 /** 14638 * {@hide} 14639 * 14640 * @param isRoot true if the view belongs to the root namespace, false 14641 * otherwise 14642 */ 14643 public void setIsRootNamespace(boolean isRoot) { 14644 if (isRoot) { 14645 mPrivateFlags |= IS_ROOT_NAMESPACE; 14646 } else { 14647 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14648 } 14649 } 14650 14651 /** 14652 * {@hide} 14653 * 14654 * @return true if the view belongs to the root namespace, false otherwise 14655 */ 14656 public boolean isRootNamespace() { 14657 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14658 } 14659 14660 /** 14661 * Returns this view's identifier. 14662 * 14663 * @return a positive integer used to identify the view or {@link #NO_ID} 14664 * if the view has no ID 14665 * 14666 * @see #setId(int) 14667 * @see #findViewById(int) 14668 * @attr ref android.R.styleable#View_id 14669 */ 14670 @ViewDebug.CapturedViewProperty 14671 public int getId() { 14672 return mID; 14673 } 14674 14675 /** 14676 * Returns this view's tag. 14677 * 14678 * @return the Object stored in this view as a tag 14679 * 14680 * @see #setTag(Object) 14681 * @see #getTag(int) 14682 */ 14683 @ViewDebug.ExportedProperty 14684 public Object getTag() { 14685 return mTag; 14686 } 14687 14688 /** 14689 * Sets the tag associated with this view. A tag can be used to mark 14690 * a view in its hierarchy and does not have to be unique within the 14691 * hierarchy. Tags can also be used to store data within a view without 14692 * resorting to another data structure. 14693 * 14694 * @param tag an Object to tag the view with 14695 * 14696 * @see #getTag() 14697 * @see #setTag(int, Object) 14698 */ 14699 public void setTag(final Object tag) { 14700 mTag = tag; 14701 } 14702 14703 /** 14704 * Returns the tag associated with this view and the specified key. 14705 * 14706 * @param key The key identifying the tag 14707 * 14708 * @return the Object stored in this view as a tag 14709 * 14710 * @see #setTag(int, Object) 14711 * @see #getTag() 14712 */ 14713 public Object getTag(int key) { 14714 if (mKeyedTags != null) return mKeyedTags.get(key); 14715 return null; 14716 } 14717 14718 /** 14719 * Sets a tag associated with this view and a key. A tag can be used 14720 * to mark a view in its hierarchy and does not have to be unique within 14721 * the hierarchy. Tags can also be used to store data within a view 14722 * without resorting to another data structure. 14723 * 14724 * The specified key should be an id declared in the resources of the 14725 * application to ensure it is unique (see the <a 14726 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14727 * Keys identified as belonging to 14728 * the Android framework or not associated with any package will cause 14729 * an {@link IllegalArgumentException} to be thrown. 14730 * 14731 * @param key The key identifying the tag 14732 * @param tag An Object to tag the view with 14733 * 14734 * @throws IllegalArgumentException If they specified key is not valid 14735 * 14736 * @see #setTag(Object) 14737 * @see #getTag(int) 14738 */ 14739 public void setTag(int key, final Object tag) { 14740 // If the package id is 0x00 or 0x01, it's either an undefined package 14741 // or a framework id 14742 if ((key >>> 24) < 2) { 14743 throw new IllegalArgumentException("The key must be an application-specific " 14744 + "resource id."); 14745 } 14746 14747 setKeyedTag(key, tag); 14748 } 14749 14750 /** 14751 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14752 * framework id. 14753 * 14754 * @hide 14755 */ 14756 public void setTagInternal(int key, Object tag) { 14757 if ((key >>> 24) != 0x1) { 14758 throw new IllegalArgumentException("The key must be a framework-specific " 14759 + "resource id."); 14760 } 14761 14762 setKeyedTag(key, tag); 14763 } 14764 14765 private void setKeyedTag(int key, Object tag) { 14766 if (mKeyedTags == null) { 14767 mKeyedTags = new SparseArray<Object>(); 14768 } 14769 14770 mKeyedTags.put(key, tag); 14771 } 14772 14773 /** 14774 * Prints information about this view in the log output, with the tag 14775 * {@link #VIEW_LOG_TAG}. 14776 * 14777 * @hide 14778 */ 14779 public void debug() { 14780 debug(0); 14781 } 14782 14783 /** 14784 * Prints information about this view in the log output, with the tag 14785 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14786 * indentation defined by the <code>depth</code>. 14787 * 14788 * @param depth the indentation level 14789 * 14790 * @hide 14791 */ 14792 protected void debug(int depth) { 14793 String output = debugIndent(depth - 1); 14794 14795 output += "+ " + this; 14796 int id = getId(); 14797 if (id != -1) { 14798 output += " (id=" + id + ")"; 14799 } 14800 Object tag = getTag(); 14801 if (tag != null) { 14802 output += " (tag=" + tag + ")"; 14803 } 14804 Log.d(VIEW_LOG_TAG, output); 14805 14806 if ((mPrivateFlags & FOCUSED) != 0) { 14807 output = debugIndent(depth) + " FOCUSED"; 14808 Log.d(VIEW_LOG_TAG, output); 14809 } 14810 14811 output = debugIndent(depth); 14812 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14813 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14814 + "} "; 14815 Log.d(VIEW_LOG_TAG, output); 14816 14817 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14818 || mPaddingBottom != 0) { 14819 output = debugIndent(depth); 14820 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14821 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14822 Log.d(VIEW_LOG_TAG, output); 14823 } 14824 14825 output = debugIndent(depth); 14826 output += "mMeasureWidth=" + mMeasuredWidth + 14827 " mMeasureHeight=" + mMeasuredHeight; 14828 Log.d(VIEW_LOG_TAG, output); 14829 14830 output = debugIndent(depth); 14831 if (mLayoutParams == null) { 14832 output += "BAD! no layout params"; 14833 } else { 14834 output = mLayoutParams.debug(output); 14835 } 14836 Log.d(VIEW_LOG_TAG, output); 14837 14838 output = debugIndent(depth); 14839 output += "flags={"; 14840 output += View.printFlags(mViewFlags); 14841 output += "}"; 14842 Log.d(VIEW_LOG_TAG, output); 14843 14844 output = debugIndent(depth); 14845 output += "privateFlags={"; 14846 output += View.printPrivateFlags(mPrivateFlags); 14847 output += "}"; 14848 Log.d(VIEW_LOG_TAG, output); 14849 } 14850 14851 /** 14852 * Creates a string of whitespaces used for indentation. 14853 * 14854 * @param depth the indentation level 14855 * @return a String containing (depth * 2 + 3) * 2 white spaces 14856 * 14857 * @hide 14858 */ 14859 protected static String debugIndent(int depth) { 14860 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14861 for (int i = 0; i < (depth * 2) + 3; i++) { 14862 spaces.append(' ').append(' '); 14863 } 14864 return spaces.toString(); 14865 } 14866 14867 /** 14868 * <p>Return the offset of the widget's text baseline from the widget's top 14869 * boundary. If this widget does not support baseline alignment, this 14870 * method returns -1. </p> 14871 * 14872 * @return the offset of the baseline within the widget's bounds or -1 14873 * if baseline alignment is not supported 14874 */ 14875 @ViewDebug.ExportedProperty(category = "layout") 14876 public int getBaseline() { 14877 return -1; 14878 } 14879 14880 /** 14881 * Call this when something has changed which has invalidated the 14882 * layout of this view. This will schedule a layout pass of the view 14883 * tree. 14884 */ 14885 public void requestLayout() { 14886 mPrivateFlags |= FORCE_LAYOUT; 14887 mPrivateFlags |= INVALIDATED; 14888 14889 if (mLayoutParams != null) { 14890 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14891 } 14892 14893 if (mParent != null && !mParent.isLayoutRequested()) { 14894 mParent.requestLayout(); 14895 } 14896 } 14897 14898 /** 14899 * Forces this view to be laid out during the next layout pass. 14900 * This method does not call requestLayout() or forceLayout() 14901 * on the parent. 14902 */ 14903 public void forceLayout() { 14904 mPrivateFlags |= FORCE_LAYOUT; 14905 mPrivateFlags |= INVALIDATED; 14906 } 14907 14908 /** 14909 * <p> 14910 * This is called to find out how big a view should be. The parent 14911 * supplies constraint information in the width and height parameters. 14912 * </p> 14913 * 14914 * <p> 14915 * The actual measurement work of a view is performed in 14916 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14917 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14918 * </p> 14919 * 14920 * 14921 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14922 * parent 14923 * @param heightMeasureSpec Vertical space requirements as imposed by the 14924 * parent 14925 * 14926 * @see #onMeasure(int, int) 14927 */ 14928 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14929 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14930 widthMeasureSpec != mOldWidthMeasureSpec || 14931 heightMeasureSpec != mOldHeightMeasureSpec) { 14932 14933 // first clears the measured dimension flag 14934 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14935 14936 // measure ourselves, this should set the measured dimension flag back 14937 onMeasure(widthMeasureSpec, heightMeasureSpec); 14938 14939 // flag not set, setMeasuredDimension() was not invoked, we raise 14940 // an exception to warn the developer 14941 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 14942 throw new IllegalStateException("onMeasure() did not set the" 14943 + " measured dimension by calling" 14944 + " setMeasuredDimension()"); 14945 } 14946 14947 mPrivateFlags |= LAYOUT_REQUIRED; 14948 } 14949 14950 mOldWidthMeasureSpec = widthMeasureSpec; 14951 mOldHeightMeasureSpec = heightMeasureSpec; 14952 } 14953 14954 /** 14955 * <p> 14956 * Measure the view and its content to determine the measured width and the 14957 * measured height. This method is invoked by {@link #measure(int, int)} and 14958 * should be overriden by subclasses to provide accurate and efficient 14959 * measurement of their contents. 14960 * </p> 14961 * 14962 * <p> 14963 * <strong>CONTRACT:</strong> When overriding this method, you 14964 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 14965 * measured width and height of this view. Failure to do so will trigger an 14966 * <code>IllegalStateException</code>, thrown by 14967 * {@link #measure(int, int)}. Calling the superclass' 14968 * {@link #onMeasure(int, int)} is a valid use. 14969 * </p> 14970 * 14971 * <p> 14972 * The base class implementation of measure defaults to the background size, 14973 * unless a larger size is allowed by the MeasureSpec. Subclasses should 14974 * override {@link #onMeasure(int, int)} to provide better measurements of 14975 * their content. 14976 * </p> 14977 * 14978 * <p> 14979 * If this method is overridden, it is the subclass's responsibility to make 14980 * sure the measured height and width are at least the view's minimum height 14981 * and width ({@link #getSuggestedMinimumHeight()} and 14982 * {@link #getSuggestedMinimumWidth()}). 14983 * </p> 14984 * 14985 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 14986 * The requirements are encoded with 14987 * {@link android.view.View.MeasureSpec}. 14988 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 14989 * The requirements are encoded with 14990 * {@link android.view.View.MeasureSpec}. 14991 * 14992 * @see #getMeasuredWidth() 14993 * @see #getMeasuredHeight() 14994 * @see #setMeasuredDimension(int, int) 14995 * @see #getSuggestedMinimumHeight() 14996 * @see #getSuggestedMinimumWidth() 14997 * @see android.view.View.MeasureSpec#getMode(int) 14998 * @see android.view.View.MeasureSpec#getSize(int) 14999 */ 15000 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15001 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15002 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15003 } 15004 15005 /** 15006 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 15007 * measured width and measured height. Failing to do so will trigger an 15008 * exception at measurement time.</p> 15009 * 15010 * @param measuredWidth The measured width of this view. May be a complex 15011 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15012 * {@link #MEASURED_STATE_TOO_SMALL}. 15013 * @param measuredHeight The measured height of this view. May be a complex 15014 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15015 * {@link #MEASURED_STATE_TOO_SMALL}. 15016 */ 15017 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15018 mMeasuredWidth = measuredWidth; 15019 mMeasuredHeight = measuredHeight; 15020 15021 mPrivateFlags |= MEASURED_DIMENSION_SET; 15022 } 15023 15024 /** 15025 * Merge two states as returned by {@link #getMeasuredState()}. 15026 * @param curState The current state as returned from a view or the result 15027 * of combining multiple views. 15028 * @param newState The new view state to combine. 15029 * @return Returns a new integer reflecting the combination of the two 15030 * states. 15031 */ 15032 public static int combineMeasuredStates(int curState, int newState) { 15033 return curState | newState; 15034 } 15035 15036 /** 15037 * Version of {@link #resolveSizeAndState(int, int, int)} 15038 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15039 */ 15040 public static int resolveSize(int size, int measureSpec) { 15041 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15042 } 15043 15044 /** 15045 * Utility to reconcile a desired size and state, with constraints imposed 15046 * by a MeasureSpec. Will take the desired size, unless a different size 15047 * is imposed by the constraints. The returned value is a compound integer, 15048 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15049 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15050 * size is smaller than the size the view wants to be. 15051 * 15052 * @param size How big the view wants to be 15053 * @param measureSpec Constraints imposed by the parent 15054 * @return Size information bit mask as defined by 15055 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15056 */ 15057 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15058 int result = size; 15059 int specMode = MeasureSpec.getMode(measureSpec); 15060 int specSize = MeasureSpec.getSize(measureSpec); 15061 switch (specMode) { 15062 case MeasureSpec.UNSPECIFIED: 15063 result = size; 15064 break; 15065 case MeasureSpec.AT_MOST: 15066 if (specSize < size) { 15067 result = specSize | MEASURED_STATE_TOO_SMALL; 15068 } else { 15069 result = size; 15070 } 15071 break; 15072 case MeasureSpec.EXACTLY: 15073 result = specSize; 15074 break; 15075 } 15076 return result | (childMeasuredState&MEASURED_STATE_MASK); 15077 } 15078 15079 /** 15080 * Utility to return a default size. Uses the supplied size if the 15081 * MeasureSpec imposed no constraints. Will get larger if allowed 15082 * by the MeasureSpec. 15083 * 15084 * @param size Default size for this view 15085 * @param measureSpec Constraints imposed by the parent 15086 * @return The size this view should be. 15087 */ 15088 public static int getDefaultSize(int size, int measureSpec) { 15089 int result = size; 15090 int specMode = MeasureSpec.getMode(measureSpec); 15091 int specSize = MeasureSpec.getSize(measureSpec); 15092 15093 switch (specMode) { 15094 case MeasureSpec.UNSPECIFIED: 15095 result = size; 15096 break; 15097 case MeasureSpec.AT_MOST: 15098 case MeasureSpec.EXACTLY: 15099 result = specSize; 15100 break; 15101 } 15102 return result; 15103 } 15104 15105 /** 15106 * Returns the suggested minimum height that the view should use. This 15107 * returns the maximum of the view's minimum height 15108 * and the background's minimum height 15109 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15110 * <p> 15111 * When being used in {@link #onMeasure(int, int)}, the caller should still 15112 * ensure the returned height is within the requirements of the parent. 15113 * 15114 * @return The suggested minimum height of the view. 15115 */ 15116 protected int getSuggestedMinimumHeight() { 15117 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15118 15119 } 15120 15121 /** 15122 * Returns the suggested minimum width that the view should use. This 15123 * returns the maximum of the view's minimum width) 15124 * and the background's minimum width 15125 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15126 * <p> 15127 * When being used in {@link #onMeasure(int, int)}, the caller should still 15128 * ensure the returned width is within the requirements of the parent. 15129 * 15130 * @return The suggested minimum width of the view. 15131 */ 15132 protected int getSuggestedMinimumWidth() { 15133 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15134 } 15135 15136 /** 15137 * Returns the minimum height of the view. 15138 * 15139 * @return the minimum height the view will try to be. 15140 * 15141 * @see #setMinimumHeight(int) 15142 * 15143 * @attr ref android.R.styleable#View_minHeight 15144 */ 15145 public int getMinimumHeight() { 15146 return mMinHeight; 15147 } 15148 15149 /** 15150 * Sets the minimum height of the view. It is not guaranteed the view will 15151 * be able to achieve this minimum height (for example, if its parent layout 15152 * constrains it with less available height). 15153 * 15154 * @param minHeight The minimum height the view will try to be. 15155 * 15156 * @see #getMinimumHeight() 15157 * 15158 * @attr ref android.R.styleable#View_minHeight 15159 */ 15160 public void setMinimumHeight(int minHeight) { 15161 mMinHeight = minHeight; 15162 requestLayout(); 15163 } 15164 15165 /** 15166 * Returns the minimum width of the view. 15167 * 15168 * @return the minimum width the view will try to be. 15169 * 15170 * @see #setMinimumWidth(int) 15171 * 15172 * @attr ref android.R.styleable#View_minWidth 15173 */ 15174 public int getMinimumWidth() { 15175 return mMinWidth; 15176 } 15177 15178 /** 15179 * Sets the minimum width of the view. It is not guaranteed the view will 15180 * be able to achieve this minimum width (for example, if its parent layout 15181 * constrains it with less available width). 15182 * 15183 * @param minWidth The minimum width the view will try to be. 15184 * 15185 * @see #getMinimumWidth() 15186 * 15187 * @attr ref android.R.styleable#View_minWidth 15188 */ 15189 public void setMinimumWidth(int minWidth) { 15190 mMinWidth = minWidth; 15191 requestLayout(); 15192 15193 } 15194 15195 /** 15196 * Get the animation currently associated with this view. 15197 * 15198 * @return The animation that is currently playing or 15199 * scheduled to play for this view. 15200 */ 15201 public Animation getAnimation() { 15202 return mCurrentAnimation; 15203 } 15204 15205 /** 15206 * Start the specified animation now. 15207 * 15208 * @param animation the animation to start now 15209 */ 15210 public void startAnimation(Animation animation) { 15211 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15212 setAnimation(animation); 15213 invalidateParentCaches(); 15214 invalidate(true); 15215 } 15216 15217 /** 15218 * Cancels any animations for this view. 15219 */ 15220 public void clearAnimation() { 15221 if (mCurrentAnimation != null) { 15222 mCurrentAnimation.detach(); 15223 } 15224 mCurrentAnimation = null; 15225 invalidateParentIfNeeded(); 15226 } 15227 15228 /** 15229 * Sets the next animation to play for this view. 15230 * If you want the animation to play immediately, use 15231 * {@link #startAnimation(android.view.animation.Animation)} instead. 15232 * This method provides allows fine-grained 15233 * control over the start time and invalidation, but you 15234 * must make sure that 1) the animation has a start time set, and 15235 * 2) the view's parent (which controls animations on its children) 15236 * will be invalidated when the animation is supposed to 15237 * start. 15238 * 15239 * @param animation The next animation, or null. 15240 */ 15241 public void setAnimation(Animation animation) { 15242 mCurrentAnimation = animation; 15243 15244 if (animation != null) { 15245 // If the screen is off assume the animation start time is now instead of 15246 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15247 // would cause the animation to start when the screen turns back on 15248 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15249 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15250 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15251 } 15252 animation.reset(); 15253 } 15254 } 15255 15256 /** 15257 * Invoked by a parent ViewGroup to notify the start of the animation 15258 * currently associated with this view. If you override this method, 15259 * always call super.onAnimationStart(); 15260 * 15261 * @see #setAnimation(android.view.animation.Animation) 15262 * @see #getAnimation() 15263 */ 15264 protected void onAnimationStart() { 15265 mPrivateFlags |= ANIMATION_STARTED; 15266 } 15267 15268 /** 15269 * Invoked by a parent ViewGroup to notify the end of the animation 15270 * currently associated with this view. If you override this method, 15271 * always call super.onAnimationEnd(); 15272 * 15273 * @see #setAnimation(android.view.animation.Animation) 15274 * @see #getAnimation() 15275 */ 15276 protected void onAnimationEnd() { 15277 mPrivateFlags &= ~ANIMATION_STARTED; 15278 } 15279 15280 /** 15281 * Invoked if there is a Transform that involves alpha. Subclass that can 15282 * draw themselves with the specified alpha should return true, and then 15283 * respect that alpha when their onDraw() is called. If this returns false 15284 * then the view may be redirected to draw into an offscreen buffer to 15285 * fulfill the request, which will look fine, but may be slower than if the 15286 * subclass handles it internally. The default implementation returns false. 15287 * 15288 * @param alpha The alpha (0..255) to apply to the view's drawing 15289 * @return true if the view can draw with the specified alpha. 15290 */ 15291 protected boolean onSetAlpha(int alpha) { 15292 return false; 15293 } 15294 15295 /** 15296 * This is used by the RootView to perform an optimization when 15297 * the view hierarchy contains one or several SurfaceView. 15298 * SurfaceView is always considered transparent, but its children are not, 15299 * therefore all View objects remove themselves from the global transparent 15300 * region (passed as a parameter to this function). 15301 * 15302 * @param region The transparent region for this ViewAncestor (window). 15303 * 15304 * @return Returns true if the effective visibility of the view at this 15305 * point is opaque, regardless of the transparent region; returns false 15306 * if it is possible for underlying windows to be seen behind the view. 15307 * 15308 * {@hide} 15309 */ 15310 public boolean gatherTransparentRegion(Region region) { 15311 final AttachInfo attachInfo = mAttachInfo; 15312 if (region != null && attachInfo != null) { 15313 final int pflags = mPrivateFlags; 15314 if ((pflags & SKIP_DRAW) == 0) { 15315 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15316 // remove it from the transparent region. 15317 final int[] location = attachInfo.mTransparentLocation; 15318 getLocationInWindow(location); 15319 region.op(location[0], location[1], location[0] + mRight - mLeft, 15320 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15321 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15322 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15323 // exists, so we remove the background drawable's non-transparent 15324 // parts from this transparent region. 15325 applyDrawableToTransparentRegion(mBackground, region); 15326 } 15327 } 15328 return true; 15329 } 15330 15331 /** 15332 * Play a sound effect for this view. 15333 * 15334 * <p>The framework will play sound effects for some built in actions, such as 15335 * clicking, but you may wish to play these effects in your widget, 15336 * for instance, for internal navigation. 15337 * 15338 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15339 * {@link #isSoundEffectsEnabled()} is true. 15340 * 15341 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15342 */ 15343 public void playSoundEffect(int soundConstant) { 15344 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15345 return; 15346 } 15347 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15348 } 15349 15350 /** 15351 * BZZZTT!!1! 15352 * 15353 * <p>Provide haptic feedback to the user for this view. 15354 * 15355 * <p>The framework will provide haptic feedback for some built in actions, 15356 * such as long presses, but you may wish to provide feedback for your 15357 * own widget. 15358 * 15359 * <p>The feedback will only be performed if 15360 * {@link #isHapticFeedbackEnabled()} is true. 15361 * 15362 * @param feedbackConstant One of the constants defined in 15363 * {@link HapticFeedbackConstants} 15364 */ 15365 public boolean performHapticFeedback(int feedbackConstant) { 15366 return performHapticFeedback(feedbackConstant, 0); 15367 } 15368 15369 /** 15370 * BZZZTT!!1! 15371 * 15372 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15373 * 15374 * @param feedbackConstant One of the constants defined in 15375 * {@link HapticFeedbackConstants} 15376 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15377 */ 15378 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15379 if (mAttachInfo == null) { 15380 return false; 15381 } 15382 //noinspection SimplifiableIfStatement 15383 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15384 && !isHapticFeedbackEnabled()) { 15385 return false; 15386 } 15387 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15388 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15389 } 15390 15391 /** 15392 * Request that the visibility of the status bar or other screen/window 15393 * decorations be changed. 15394 * 15395 * <p>This method is used to put the over device UI into temporary modes 15396 * where the user's attention is focused more on the application content, 15397 * by dimming or hiding surrounding system affordances. This is typically 15398 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15399 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15400 * to be placed behind the action bar (and with these flags other system 15401 * affordances) so that smooth transitions between hiding and showing them 15402 * can be done. 15403 * 15404 * <p>Two representative examples of the use of system UI visibility is 15405 * implementing a content browsing application (like a magazine reader) 15406 * and a video playing application. 15407 * 15408 * <p>The first code shows a typical implementation of a View in a content 15409 * browsing application. In this implementation, the application goes 15410 * into a content-oriented mode by hiding the status bar and action bar, 15411 * and putting the navigation elements into lights out mode. The user can 15412 * then interact with content while in this mode. Such an application should 15413 * provide an easy way for the user to toggle out of the mode (such as to 15414 * check information in the status bar or access notifications). In the 15415 * implementation here, this is done simply by tapping on the content. 15416 * 15417 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15418 * content} 15419 * 15420 * <p>This second code sample shows a typical implementation of a View 15421 * in a video playing application. In this situation, while the video is 15422 * playing the application would like to go into a complete full-screen mode, 15423 * to use as much of the display as possible for the video. When in this state 15424 * the user can not interact with the application; the system intercepts 15425 * touching on the screen to pop the UI out of full screen mode. See 15426 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 15427 * 15428 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15429 * content} 15430 * 15431 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15432 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15433 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15434 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15435 */ 15436 public void setSystemUiVisibility(int visibility) { 15437 if (visibility != mSystemUiVisibility) { 15438 mSystemUiVisibility = visibility; 15439 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15440 mParent.recomputeViewAttributes(this); 15441 } 15442 } 15443 } 15444 15445 /** 15446 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15447 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15448 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15449 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15450 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15451 */ 15452 public int getSystemUiVisibility() { 15453 return mSystemUiVisibility; 15454 } 15455 15456 /** 15457 * Returns the current system UI visibility that is currently set for 15458 * the entire window. This is the combination of the 15459 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15460 * views in the window. 15461 */ 15462 public int getWindowSystemUiVisibility() { 15463 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15464 } 15465 15466 /** 15467 * Override to find out when the window's requested system UI visibility 15468 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15469 * This is different from the callbacks recieved through 15470 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15471 * in that this is only telling you about the local request of the window, 15472 * not the actual values applied by the system. 15473 */ 15474 public void onWindowSystemUiVisibilityChanged(int visible) { 15475 } 15476 15477 /** 15478 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15479 * the view hierarchy. 15480 */ 15481 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15482 onWindowSystemUiVisibilityChanged(visible); 15483 } 15484 15485 /** 15486 * Set a listener to receive callbacks when the visibility of the system bar changes. 15487 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15488 */ 15489 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15490 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15491 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15492 mParent.recomputeViewAttributes(this); 15493 } 15494 } 15495 15496 /** 15497 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15498 * the view hierarchy. 15499 */ 15500 public void dispatchSystemUiVisibilityChanged(int visibility) { 15501 ListenerInfo li = mListenerInfo; 15502 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15503 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15504 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15505 } 15506 } 15507 15508 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 15509 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15510 if (val != mSystemUiVisibility) { 15511 setSystemUiVisibility(val); 15512 return true; 15513 } 15514 return false; 15515 } 15516 15517 /** @hide */ 15518 public void setDisabledSystemUiVisibility(int flags) { 15519 if (mAttachInfo != null) { 15520 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15521 mAttachInfo.mDisabledSystemUiVisibility = flags; 15522 if (mParent != null) { 15523 mParent.recomputeViewAttributes(this); 15524 } 15525 } 15526 } 15527 } 15528 15529 /** 15530 * Creates an image that the system displays during the drag and drop 15531 * operation. This is called a "drag shadow". The default implementation 15532 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15533 * appearance as the given View. The default also positions the center of the drag shadow 15534 * directly under the touch point. If no View is provided (the constructor with no parameters 15535 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15536 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15537 * default is an invisible drag shadow. 15538 * <p> 15539 * You are not required to use the View you provide to the constructor as the basis of the 15540 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15541 * anything you want as the drag shadow. 15542 * </p> 15543 * <p> 15544 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15545 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15546 * size and position of the drag shadow. It uses this data to construct a 15547 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15548 * so that your application can draw the shadow image in the Canvas. 15549 * </p> 15550 * 15551 * <div class="special reference"> 15552 * <h3>Developer Guides</h3> 15553 * <p>For a guide to implementing drag and drop features, read the 15554 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15555 * </div> 15556 */ 15557 public static class DragShadowBuilder { 15558 private final WeakReference<View> mView; 15559 15560 /** 15561 * Constructs a shadow image builder based on a View. By default, the resulting drag 15562 * shadow will have the same appearance and dimensions as the View, with the touch point 15563 * over the center of the View. 15564 * @param view A View. Any View in scope can be used. 15565 */ 15566 public DragShadowBuilder(View view) { 15567 mView = new WeakReference<View>(view); 15568 } 15569 15570 /** 15571 * Construct a shadow builder object with no associated View. This 15572 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15573 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15574 * to supply the drag shadow's dimensions and appearance without 15575 * reference to any View object. If they are not overridden, then the result is an 15576 * invisible drag shadow. 15577 */ 15578 public DragShadowBuilder() { 15579 mView = new WeakReference<View>(null); 15580 } 15581 15582 /** 15583 * Returns the View object that had been passed to the 15584 * {@link #View.DragShadowBuilder(View)} 15585 * constructor. If that View parameter was {@code null} or if the 15586 * {@link #View.DragShadowBuilder()} 15587 * constructor was used to instantiate the builder object, this method will return 15588 * null. 15589 * 15590 * @return The View object associate with this builder object. 15591 */ 15592 @SuppressWarnings({"JavadocReference"}) 15593 final public View getView() { 15594 return mView.get(); 15595 } 15596 15597 /** 15598 * Provides the metrics for the shadow image. These include the dimensions of 15599 * the shadow image, and the point within that shadow that should 15600 * be centered under the touch location while dragging. 15601 * <p> 15602 * The default implementation sets the dimensions of the shadow to be the 15603 * same as the dimensions of the View itself and centers the shadow under 15604 * the touch point. 15605 * </p> 15606 * 15607 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15608 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15609 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15610 * image. 15611 * 15612 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15613 * shadow image that should be underneath the touch point during the drag and drop 15614 * operation. Your application must set {@link android.graphics.Point#x} to the 15615 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15616 */ 15617 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15618 final View view = mView.get(); 15619 if (view != null) { 15620 shadowSize.set(view.getWidth(), view.getHeight()); 15621 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15622 } else { 15623 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15624 } 15625 } 15626 15627 /** 15628 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15629 * based on the dimensions it received from the 15630 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15631 * 15632 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15633 */ 15634 public void onDrawShadow(Canvas canvas) { 15635 final View view = mView.get(); 15636 if (view != null) { 15637 view.draw(canvas); 15638 } else { 15639 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15640 } 15641 } 15642 } 15643 15644 /** 15645 * Starts a drag and drop operation. When your application calls this method, it passes a 15646 * {@link android.view.View.DragShadowBuilder} object to the system. The 15647 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15648 * to get metrics for the drag shadow, and then calls the object's 15649 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15650 * <p> 15651 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15652 * drag events to all the View objects in your application that are currently visible. It does 15653 * this either by calling the View object's drag listener (an implementation of 15654 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15655 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15656 * Both are passed a {@link android.view.DragEvent} object that has a 15657 * {@link android.view.DragEvent#getAction()} value of 15658 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15659 * </p> 15660 * <p> 15661 * Your application can invoke startDrag() on any attached View object. The View object does not 15662 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15663 * be related to the View the user selected for dragging. 15664 * </p> 15665 * @param data A {@link android.content.ClipData} object pointing to the data to be 15666 * transferred by the drag and drop operation. 15667 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15668 * drag shadow. 15669 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15670 * drop operation. This Object is put into every DragEvent object sent by the system during the 15671 * current drag. 15672 * <p> 15673 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15674 * to the target Views. For example, it can contain flags that differentiate between a 15675 * a copy operation and a move operation. 15676 * </p> 15677 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15678 * so the parameter should be set to 0. 15679 * @return {@code true} if the method completes successfully, or 15680 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15681 * do a drag, and so no drag operation is in progress. 15682 */ 15683 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15684 Object myLocalState, int flags) { 15685 if (ViewDebug.DEBUG_DRAG) { 15686 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15687 } 15688 boolean okay = false; 15689 15690 Point shadowSize = new Point(); 15691 Point shadowTouchPoint = new Point(); 15692 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15693 15694 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15695 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15696 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15697 } 15698 15699 if (ViewDebug.DEBUG_DRAG) { 15700 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15701 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15702 } 15703 Surface surface = new Surface(); 15704 try { 15705 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15706 flags, shadowSize.x, shadowSize.y, surface); 15707 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15708 + " surface=" + surface); 15709 if (token != null) { 15710 Canvas canvas = surface.lockCanvas(null); 15711 try { 15712 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15713 shadowBuilder.onDrawShadow(canvas); 15714 } finally { 15715 surface.unlockCanvasAndPost(canvas); 15716 } 15717 15718 final ViewRootImpl root = getViewRootImpl(); 15719 15720 // Cache the local state object for delivery with DragEvents 15721 root.setLocalDragState(myLocalState); 15722 15723 // repurpose 'shadowSize' for the last touch point 15724 root.getLastTouchPoint(shadowSize); 15725 15726 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15727 shadowSize.x, shadowSize.y, 15728 shadowTouchPoint.x, shadowTouchPoint.y, data); 15729 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15730 15731 // Off and running! Release our local surface instance; the drag 15732 // shadow surface is now managed by the system process. 15733 surface.release(); 15734 } 15735 } catch (Exception e) { 15736 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15737 surface.destroy(); 15738 } 15739 15740 return okay; 15741 } 15742 15743 /** 15744 * Handles drag events sent by the system following a call to 15745 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15746 *<p> 15747 * When the system calls this method, it passes a 15748 * {@link android.view.DragEvent} object. A call to 15749 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15750 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15751 * operation. 15752 * @param event The {@link android.view.DragEvent} sent by the system. 15753 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15754 * in DragEvent, indicating the type of drag event represented by this object. 15755 * @return {@code true} if the method was successful, otherwise {@code false}. 15756 * <p> 15757 * The method should return {@code true} in response to an action type of 15758 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15759 * operation. 15760 * </p> 15761 * <p> 15762 * The method should also return {@code true} in response to an action type of 15763 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15764 * {@code false} if it didn't. 15765 * </p> 15766 */ 15767 public boolean onDragEvent(DragEvent event) { 15768 return false; 15769 } 15770 15771 /** 15772 * Detects if this View is enabled and has a drag event listener. 15773 * If both are true, then it calls the drag event listener with the 15774 * {@link android.view.DragEvent} it received. If the drag event listener returns 15775 * {@code true}, then dispatchDragEvent() returns {@code true}. 15776 * <p> 15777 * For all other cases, the method calls the 15778 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15779 * method and returns its result. 15780 * </p> 15781 * <p> 15782 * This ensures that a drag event is always consumed, even if the View does not have a drag 15783 * event listener. However, if the View has a listener and the listener returns true, then 15784 * onDragEvent() is not called. 15785 * </p> 15786 */ 15787 public boolean dispatchDragEvent(DragEvent event) { 15788 //noinspection SimplifiableIfStatement 15789 ListenerInfo li = mListenerInfo; 15790 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15791 && li.mOnDragListener.onDrag(this, event)) { 15792 return true; 15793 } 15794 return onDragEvent(event); 15795 } 15796 15797 boolean canAcceptDrag() { 15798 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15799 } 15800 15801 /** 15802 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15803 * it is ever exposed at all. 15804 * @hide 15805 */ 15806 public void onCloseSystemDialogs(String reason) { 15807 } 15808 15809 /** 15810 * Given a Drawable whose bounds have been set to draw into this view, 15811 * update a Region being computed for 15812 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15813 * that any non-transparent parts of the Drawable are removed from the 15814 * given transparent region. 15815 * 15816 * @param dr The Drawable whose transparency is to be applied to the region. 15817 * @param region A Region holding the current transparency information, 15818 * where any parts of the region that are set are considered to be 15819 * transparent. On return, this region will be modified to have the 15820 * transparency information reduced by the corresponding parts of the 15821 * Drawable that are not transparent. 15822 * {@hide} 15823 */ 15824 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15825 if (DBG) { 15826 Log.i("View", "Getting transparent region for: " + this); 15827 } 15828 final Region r = dr.getTransparentRegion(); 15829 final Rect db = dr.getBounds(); 15830 final AttachInfo attachInfo = mAttachInfo; 15831 if (r != null && attachInfo != null) { 15832 final int w = getRight()-getLeft(); 15833 final int h = getBottom()-getTop(); 15834 if (db.left > 0) { 15835 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15836 r.op(0, 0, db.left, h, Region.Op.UNION); 15837 } 15838 if (db.right < w) { 15839 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15840 r.op(db.right, 0, w, h, Region.Op.UNION); 15841 } 15842 if (db.top > 0) { 15843 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15844 r.op(0, 0, w, db.top, Region.Op.UNION); 15845 } 15846 if (db.bottom < h) { 15847 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15848 r.op(0, db.bottom, w, h, Region.Op.UNION); 15849 } 15850 final int[] location = attachInfo.mTransparentLocation; 15851 getLocationInWindow(location); 15852 r.translate(location[0], location[1]); 15853 region.op(r, Region.Op.INTERSECT); 15854 } else { 15855 region.op(db, Region.Op.DIFFERENCE); 15856 } 15857 } 15858 15859 private void checkForLongClick(int delayOffset) { 15860 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15861 mHasPerformedLongPress = false; 15862 15863 if (mPendingCheckForLongPress == null) { 15864 mPendingCheckForLongPress = new CheckForLongPress(); 15865 } 15866 mPendingCheckForLongPress.rememberWindowAttachCount(); 15867 postDelayed(mPendingCheckForLongPress, 15868 ViewConfiguration.getLongPressTimeout() - delayOffset); 15869 } 15870 } 15871 15872 /** 15873 * Inflate a view from an XML resource. This convenience method wraps the {@link 15874 * LayoutInflater} class, which provides a full range of options for view inflation. 15875 * 15876 * @param context The Context object for your activity or application. 15877 * @param resource The resource ID to inflate 15878 * @param root A view group that will be the parent. Used to properly inflate the 15879 * layout_* parameters. 15880 * @see LayoutInflater 15881 */ 15882 public static View inflate(Context context, int resource, ViewGroup root) { 15883 LayoutInflater factory = LayoutInflater.from(context); 15884 return factory.inflate(resource, root); 15885 } 15886 15887 /** 15888 * Scroll the view with standard behavior for scrolling beyond the normal 15889 * content boundaries. Views that call this method should override 15890 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15891 * results of an over-scroll operation. 15892 * 15893 * Views can use this method to handle any touch or fling-based scrolling. 15894 * 15895 * @param deltaX Change in X in pixels 15896 * @param deltaY Change in Y in pixels 15897 * @param scrollX Current X scroll value in pixels before applying deltaX 15898 * @param scrollY Current Y scroll value in pixels before applying deltaY 15899 * @param scrollRangeX Maximum content scroll range along the X axis 15900 * @param scrollRangeY Maximum content scroll range along the Y axis 15901 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15902 * along the X axis. 15903 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15904 * along the Y axis. 15905 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15906 * @return true if scrolling was clamped to an over-scroll boundary along either 15907 * axis, false otherwise. 15908 */ 15909 @SuppressWarnings({"UnusedParameters"}) 15910 protected boolean overScrollBy(int deltaX, int deltaY, 15911 int scrollX, int scrollY, 15912 int scrollRangeX, int scrollRangeY, 15913 int maxOverScrollX, int maxOverScrollY, 15914 boolean isTouchEvent) { 15915 final int overScrollMode = mOverScrollMode; 15916 final boolean canScrollHorizontal = 15917 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15918 final boolean canScrollVertical = 15919 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15920 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15921 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15922 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15923 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15924 15925 int newScrollX = scrollX + deltaX; 15926 if (!overScrollHorizontal) { 15927 maxOverScrollX = 0; 15928 } 15929 15930 int newScrollY = scrollY + deltaY; 15931 if (!overScrollVertical) { 15932 maxOverScrollY = 0; 15933 } 15934 15935 // Clamp values if at the limits and record 15936 final int left = -maxOverScrollX; 15937 final int right = maxOverScrollX + scrollRangeX; 15938 final int top = -maxOverScrollY; 15939 final int bottom = maxOverScrollY + scrollRangeY; 15940 15941 boolean clampedX = false; 15942 if (newScrollX > right) { 15943 newScrollX = right; 15944 clampedX = true; 15945 } else if (newScrollX < left) { 15946 newScrollX = left; 15947 clampedX = true; 15948 } 15949 15950 boolean clampedY = false; 15951 if (newScrollY > bottom) { 15952 newScrollY = bottom; 15953 clampedY = true; 15954 } else if (newScrollY < top) { 15955 newScrollY = top; 15956 clampedY = true; 15957 } 15958 15959 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 15960 15961 return clampedX || clampedY; 15962 } 15963 15964 /** 15965 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 15966 * respond to the results of an over-scroll operation. 15967 * 15968 * @param scrollX New X scroll value in pixels 15969 * @param scrollY New Y scroll value in pixels 15970 * @param clampedX True if scrollX was clamped to an over-scroll boundary 15971 * @param clampedY True if scrollY was clamped to an over-scroll boundary 15972 */ 15973 protected void onOverScrolled(int scrollX, int scrollY, 15974 boolean clampedX, boolean clampedY) { 15975 // Intentionally empty. 15976 } 15977 15978 /** 15979 * Returns the over-scroll mode for this view. The result will be 15980 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15981 * (allow over-scrolling only if the view content is larger than the container), 15982 * or {@link #OVER_SCROLL_NEVER}. 15983 * 15984 * @return This view's over-scroll mode. 15985 */ 15986 public int getOverScrollMode() { 15987 return mOverScrollMode; 15988 } 15989 15990 /** 15991 * Set the over-scroll mode for this view. Valid over-scroll modes are 15992 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15993 * (allow over-scrolling only if the view content is larger than the container), 15994 * or {@link #OVER_SCROLL_NEVER}. 15995 * 15996 * Setting the over-scroll mode of a view will have an effect only if the 15997 * view is capable of scrolling. 15998 * 15999 * @param overScrollMode The new over-scroll mode for this view. 16000 */ 16001 public void setOverScrollMode(int overScrollMode) { 16002 if (overScrollMode != OVER_SCROLL_ALWAYS && 16003 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16004 overScrollMode != OVER_SCROLL_NEVER) { 16005 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16006 } 16007 mOverScrollMode = overScrollMode; 16008 } 16009 16010 /** 16011 * Gets a scale factor that determines the distance the view should scroll 16012 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16013 * @return The vertical scroll scale factor. 16014 * @hide 16015 */ 16016 protected float getVerticalScrollFactor() { 16017 if (mVerticalScrollFactor == 0) { 16018 TypedValue outValue = new TypedValue(); 16019 if (!mContext.getTheme().resolveAttribute( 16020 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16021 throw new IllegalStateException( 16022 "Expected theme to define listPreferredItemHeight."); 16023 } 16024 mVerticalScrollFactor = outValue.getDimension( 16025 mContext.getResources().getDisplayMetrics()); 16026 } 16027 return mVerticalScrollFactor; 16028 } 16029 16030 /** 16031 * Gets a scale factor that determines the distance the view should scroll 16032 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16033 * @return The horizontal scroll scale factor. 16034 * @hide 16035 */ 16036 protected float getHorizontalScrollFactor() { 16037 // TODO: Should use something else. 16038 return getVerticalScrollFactor(); 16039 } 16040 16041 /** 16042 * Return the value specifying the text direction or policy that was set with 16043 * {@link #setTextDirection(int)}. 16044 * 16045 * @return the defined text direction. It can be one of: 16046 * 16047 * {@link #TEXT_DIRECTION_INHERIT}, 16048 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16049 * {@link #TEXT_DIRECTION_ANY_RTL}, 16050 * {@link #TEXT_DIRECTION_LTR}, 16051 * {@link #TEXT_DIRECTION_RTL}, 16052 * {@link #TEXT_DIRECTION_LOCALE} 16053 * @hide 16054 */ 16055 @ViewDebug.ExportedProperty(category = "text", mapping = { 16056 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16057 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16058 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16059 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16060 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16061 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16062 }) 16063 public int getTextDirection() { 16064 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 16065 } 16066 16067 /** 16068 * Set the text direction. 16069 * 16070 * @param textDirection the direction to set. Should be one of: 16071 * 16072 * {@link #TEXT_DIRECTION_INHERIT}, 16073 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16074 * {@link #TEXT_DIRECTION_ANY_RTL}, 16075 * {@link #TEXT_DIRECTION_LTR}, 16076 * {@link #TEXT_DIRECTION_RTL}, 16077 * {@link #TEXT_DIRECTION_LOCALE} 16078 * @hide 16079 */ 16080 public void setTextDirection(int textDirection) { 16081 if (getTextDirection() != textDirection) { 16082 // Reset the current text direction and the resolved one 16083 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 16084 resetResolvedTextDirection(); 16085 // Set the new text direction 16086 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 16087 // Refresh 16088 requestLayout(); 16089 invalidate(true); 16090 } 16091 } 16092 16093 /** 16094 * Return the resolved text direction. 16095 * 16096 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 16097 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 16098 * up the parent chain of the view. if there is no parent, then it will return the default 16099 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 16100 * 16101 * @return the resolved text direction. Returns one of: 16102 * 16103 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16104 * {@link #TEXT_DIRECTION_ANY_RTL}, 16105 * {@link #TEXT_DIRECTION_LTR}, 16106 * {@link #TEXT_DIRECTION_RTL}, 16107 * {@link #TEXT_DIRECTION_LOCALE} 16108 * @hide 16109 */ 16110 public int getResolvedTextDirection() { 16111 // The text direction will be resolved only if needed 16112 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 16113 resolveTextDirection(); 16114 } 16115 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16116 } 16117 16118 /** 16119 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 16120 * resolution is done. 16121 * @hide 16122 */ 16123 public void resolveTextDirection() { 16124 // Reset any previous text direction resolution 16125 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16126 16127 if (hasRtlSupport()) { 16128 // Set resolved text direction flag depending on text direction flag 16129 final int textDirection = getTextDirection(); 16130 switch(textDirection) { 16131 case TEXT_DIRECTION_INHERIT: 16132 if (canResolveTextDirection()) { 16133 ViewGroup viewGroup = ((ViewGroup) mParent); 16134 16135 // Set current resolved direction to the same value as the parent's one 16136 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 16137 switch (parentResolvedDirection) { 16138 case TEXT_DIRECTION_FIRST_STRONG: 16139 case TEXT_DIRECTION_ANY_RTL: 16140 case TEXT_DIRECTION_LTR: 16141 case TEXT_DIRECTION_RTL: 16142 case TEXT_DIRECTION_LOCALE: 16143 mPrivateFlags2 |= 16144 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16145 break; 16146 default: 16147 // Default resolved direction is "first strong" heuristic 16148 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16149 } 16150 } else { 16151 // We cannot do the resolution if there is no parent, so use the default one 16152 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16153 } 16154 break; 16155 case TEXT_DIRECTION_FIRST_STRONG: 16156 case TEXT_DIRECTION_ANY_RTL: 16157 case TEXT_DIRECTION_LTR: 16158 case TEXT_DIRECTION_RTL: 16159 case TEXT_DIRECTION_LOCALE: 16160 // Resolved direction is the same as text direction 16161 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16162 break; 16163 default: 16164 // Default resolved direction is "first strong" heuristic 16165 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16166 } 16167 } else { 16168 // Default resolved direction is "first strong" heuristic 16169 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16170 } 16171 16172 // Set to resolved 16173 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 16174 onResolvedTextDirectionChanged(); 16175 } 16176 16177 /** 16178 * Called when text direction has been resolved. Subclasses that care about text direction 16179 * resolution should override this method. 16180 * 16181 * The default implementation does nothing. 16182 * @hide 16183 */ 16184 public void onResolvedTextDirectionChanged() { 16185 } 16186 16187 /** 16188 * Check if text direction resolution can be done. 16189 * 16190 * @return true if text direction resolution can be done otherwise return false. 16191 * @hide 16192 */ 16193 public boolean canResolveTextDirection() { 16194 switch (getTextDirection()) { 16195 case TEXT_DIRECTION_INHERIT: 16196 return (mParent != null) && (mParent instanceof ViewGroup); 16197 default: 16198 return true; 16199 } 16200 } 16201 16202 /** 16203 * Reset resolved text direction. Text direction can be resolved with a call to 16204 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 16205 * reset is done. 16206 * @hide 16207 */ 16208 public void resetResolvedTextDirection() { 16209 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16210 onResolvedTextDirectionReset(); 16211 } 16212 16213 /** 16214 * Called when text direction is reset. Subclasses that care about text direction reset should 16215 * override this method and do a reset of the text direction of their children. The default 16216 * implementation does nothing. 16217 * @hide 16218 */ 16219 public void onResolvedTextDirectionReset() { 16220 } 16221 16222 /** 16223 * Return the value specifying the text alignment or policy that was set with 16224 * {@link #setTextAlignment(int)}. 16225 * 16226 * @return the defined text alignment. It can be one of: 16227 * 16228 * {@link #TEXT_ALIGNMENT_INHERIT}, 16229 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16230 * {@link #TEXT_ALIGNMENT_CENTER}, 16231 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16232 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16233 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16234 * {@link #TEXT_ALIGNMENT_VIEW_END} 16235 * @hide 16236 */ 16237 @ViewDebug.ExportedProperty(category = "text", mapping = { 16238 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16239 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16240 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16241 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16242 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16243 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16244 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16245 }) 16246 public int getTextAlignment() { 16247 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 16248 } 16249 16250 /** 16251 * Set the text alignment. 16252 * 16253 * @param textAlignment The text alignment to set. Should be one of 16254 * 16255 * {@link #TEXT_ALIGNMENT_INHERIT}, 16256 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16257 * {@link #TEXT_ALIGNMENT_CENTER}, 16258 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16259 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16260 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16261 * {@link #TEXT_ALIGNMENT_VIEW_END} 16262 * 16263 * @attr ref android.R.styleable#View_textAlignment 16264 * @hide 16265 */ 16266 public void setTextAlignment(int textAlignment) { 16267 if (textAlignment != getTextAlignment()) { 16268 // Reset the current and resolved text alignment 16269 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 16270 resetResolvedTextAlignment(); 16271 // Set the new text alignment 16272 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 16273 // Refresh 16274 requestLayout(); 16275 invalidate(true); 16276 } 16277 } 16278 16279 /** 16280 * Return the resolved text alignment. 16281 * 16282 * The resolved text alignment. This needs resolution if the value is 16283 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16284 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16285 * 16286 * @return the resolved text alignment. Returns one of: 16287 * 16288 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16289 * {@link #TEXT_ALIGNMENT_CENTER}, 16290 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16291 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16292 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16293 * {@link #TEXT_ALIGNMENT_VIEW_END} 16294 * @hide 16295 */ 16296 @ViewDebug.ExportedProperty(category = "text", mapping = { 16297 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16298 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16299 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16300 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16301 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16302 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16303 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16304 }) 16305 public int getResolvedTextAlignment() { 16306 // If text alignment is not resolved, then resolve it 16307 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16308 resolveTextAlignment(); 16309 } 16310 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16311 } 16312 16313 /** 16314 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16315 * resolution is done. 16316 * @hide 16317 */ 16318 public void resolveTextAlignment() { 16319 // Reset any previous text alignment resolution 16320 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16321 16322 if (hasRtlSupport()) { 16323 // Set resolved text alignment flag depending on text alignment flag 16324 final int textAlignment = getTextAlignment(); 16325 switch (textAlignment) { 16326 case TEXT_ALIGNMENT_INHERIT: 16327 // Check if we can resolve the text alignment 16328 if (canResolveLayoutDirection() && mParent instanceof View) { 16329 View view = (View) mParent; 16330 16331 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16332 switch (parentResolvedTextAlignment) { 16333 case TEXT_ALIGNMENT_GRAVITY: 16334 case TEXT_ALIGNMENT_TEXT_START: 16335 case TEXT_ALIGNMENT_TEXT_END: 16336 case TEXT_ALIGNMENT_CENTER: 16337 case TEXT_ALIGNMENT_VIEW_START: 16338 case TEXT_ALIGNMENT_VIEW_END: 16339 // Resolved text alignment is the same as the parent resolved 16340 // text alignment 16341 mPrivateFlags2 |= 16342 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16343 break; 16344 default: 16345 // Use default resolved text alignment 16346 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16347 } 16348 } 16349 else { 16350 // We cannot do the resolution if there is no parent so use the default 16351 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16352 } 16353 break; 16354 case TEXT_ALIGNMENT_GRAVITY: 16355 case TEXT_ALIGNMENT_TEXT_START: 16356 case TEXT_ALIGNMENT_TEXT_END: 16357 case TEXT_ALIGNMENT_CENTER: 16358 case TEXT_ALIGNMENT_VIEW_START: 16359 case TEXT_ALIGNMENT_VIEW_END: 16360 // Resolved text alignment is the same as text alignment 16361 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16362 break; 16363 default: 16364 // Use default resolved text alignment 16365 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16366 } 16367 } else { 16368 // Use default resolved text alignment 16369 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16370 } 16371 16372 // Set the resolved 16373 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16374 onResolvedTextAlignmentChanged(); 16375 } 16376 16377 /** 16378 * Check if text alignment resolution can be done. 16379 * 16380 * @return true if text alignment resolution can be done otherwise return false. 16381 * @hide 16382 */ 16383 public boolean canResolveTextAlignment() { 16384 switch (getTextAlignment()) { 16385 case TEXT_DIRECTION_INHERIT: 16386 return (mParent != null); 16387 default: 16388 return true; 16389 } 16390 } 16391 16392 /** 16393 * Called when text alignment has been resolved. Subclasses that care about text alignment 16394 * resolution should override this method. 16395 * 16396 * The default implementation does nothing. 16397 * @hide 16398 */ 16399 public void onResolvedTextAlignmentChanged() { 16400 } 16401 16402 /** 16403 * Reset resolved text alignment. Text alignment can be resolved with a call to 16404 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16405 * reset is done. 16406 * @hide 16407 */ 16408 public void resetResolvedTextAlignment() { 16409 // Reset any previous text alignment resolution 16410 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16411 onResolvedTextAlignmentReset(); 16412 } 16413 16414 /** 16415 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16416 * override this method and do a reset of the text alignment of their children. The default 16417 * implementation does nothing. 16418 * @hide 16419 */ 16420 public void onResolvedTextAlignmentReset() { 16421 } 16422 16423 // 16424 // Properties 16425 // 16426 /** 16427 * A Property wrapper around the <code>alpha</code> functionality handled by the 16428 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16429 */ 16430 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16431 @Override 16432 public void setValue(View object, float value) { 16433 object.setAlpha(value); 16434 } 16435 16436 @Override 16437 public Float get(View object) { 16438 return object.getAlpha(); 16439 } 16440 }; 16441 16442 /** 16443 * A Property wrapper around the <code>translationX</code> functionality handled by the 16444 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16445 */ 16446 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16447 @Override 16448 public void setValue(View object, float value) { 16449 object.setTranslationX(value); 16450 } 16451 16452 @Override 16453 public Float get(View object) { 16454 return object.getTranslationX(); 16455 } 16456 }; 16457 16458 /** 16459 * A Property wrapper around the <code>translationY</code> functionality handled by the 16460 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16461 */ 16462 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16463 @Override 16464 public void setValue(View object, float value) { 16465 object.setTranslationY(value); 16466 } 16467 16468 @Override 16469 public Float get(View object) { 16470 return object.getTranslationY(); 16471 } 16472 }; 16473 16474 /** 16475 * A Property wrapper around the <code>x</code> functionality handled by the 16476 * {@link View#setX(float)} and {@link View#getX()} methods. 16477 */ 16478 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16479 @Override 16480 public void setValue(View object, float value) { 16481 object.setX(value); 16482 } 16483 16484 @Override 16485 public Float get(View object) { 16486 return object.getX(); 16487 } 16488 }; 16489 16490 /** 16491 * A Property wrapper around the <code>y</code> functionality handled by the 16492 * {@link View#setY(float)} and {@link View#getY()} methods. 16493 */ 16494 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16495 @Override 16496 public void setValue(View object, float value) { 16497 object.setY(value); 16498 } 16499 16500 @Override 16501 public Float get(View object) { 16502 return object.getY(); 16503 } 16504 }; 16505 16506 /** 16507 * A Property wrapper around the <code>rotation</code> functionality handled by the 16508 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16509 */ 16510 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16511 @Override 16512 public void setValue(View object, float value) { 16513 object.setRotation(value); 16514 } 16515 16516 @Override 16517 public Float get(View object) { 16518 return object.getRotation(); 16519 } 16520 }; 16521 16522 /** 16523 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16524 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16525 */ 16526 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16527 @Override 16528 public void setValue(View object, float value) { 16529 object.setRotationX(value); 16530 } 16531 16532 @Override 16533 public Float get(View object) { 16534 return object.getRotationX(); 16535 } 16536 }; 16537 16538 /** 16539 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16540 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16541 */ 16542 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16543 @Override 16544 public void setValue(View object, float value) { 16545 object.setRotationY(value); 16546 } 16547 16548 @Override 16549 public Float get(View object) { 16550 return object.getRotationY(); 16551 } 16552 }; 16553 16554 /** 16555 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16556 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16557 */ 16558 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16559 @Override 16560 public void setValue(View object, float value) { 16561 object.setScaleX(value); 16562 } 16563 16564 @Override 16565 public Float get(View object) { 16566 return object.getScaleX(); 16567 } 16568 }; 16569 16570 /** 16571 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16572 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16573 */ 16574 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16575 @Override 16576 public void setValue(View object, float value) { 16577 object.setScaleY(value); 16578 } 16579 16580 @Override 16581 public Float get(View object) { 16582 return object.getScaleY(); 16583 } 16584 }; 16585 16586 /** 16587 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16588 * Each MeasureSpec represents a requirement for either the width or the height. 16589 * A MeasureSpec is comprised of a size and a mode. There are three possible 16590 * modes: 16591 * <dl> 16592 * <dt>UNSPECIFIED</dt> 16593 * <dd> 16594 * The parent has not imposed any constraint on the child. It can be whatever size 16595 * it wants. 16596 * </dd> 16597 * 16598 * <dt>EXACTLY</dt> 16599 * <dd> 16600 * The parent has determined an exact size for the child. The child is going to be 16601 * given those bounds regardless of how big it wants to be. 16602 * </dd> 16603 * 16604 * <dt>AT_MOST</dt> 16605 * <dd> 16606 * The child can be as large as it wants up to the specified size. 16607 * </dd> 16608 * </dl> 16609 * 16610 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16611 * is provided to pack and unpack the <size, mode> tuple into the int. 16612 */ 16613 public static class MeasureSpec { 16614 private static final int MODE_SHIFT = 30; 16615 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16616 16617 /** 16618 * Measure specification mode: The parent has not imposed any constraint 16619 * on the child. It can be whatever size it wants. 16620 */ 16621 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16622 16623 /** 16624 * Measure specification mode: The parent has determined an exact size 16625 * for the child. The child is going to be given those bounds regardless 16626 * of how big it wants to be. 16627 */ 16628 public static final int EXACTLY = 1 << MODE_SHIFT; 16629 16630 /** 16631 * Measure specification mode: The child can be as large as it wants up 16632 * to the specified size. 16633 */ 16634 public static final int AT_MOST = 2 << MODE_SHIFT; 16635 16636 /** 16637 * Creates a measure specification based on the supplied size and mode. 16638 * 16639 * The mode must always be one of the following: 16640 * <ul> 16641 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16642 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16643 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16644 * </ul> 16645 * 16646 * @param size the size of the measure specification 16647 * @param mode the mode of the measure specification 16648 * @return the measure specification based on size and mode 16649 */ 16650 public static int makeMeasureSpec(int size, int mode) { 16651 return size + mode; 16652 } 16653 16654 /** 16655 * Extracts the mode from the supplied measure specification. 16656 * 16657 * @param measureSpec the measure specification to extract the mode from 16658 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16659 * {@link android.view.View.MeasureSpec#AT_MOST} or 16660 * {@link android.view.View.MeasureSpec#EXACTLY} 16661 */ 16662 public static int getMode(int measureSpec) { 16663 return (measureSpec & MODE_MASK); 16664 } 16665 16666 /** 16667 * Extracts the size from the supplied measure specification. 16668 * 16669 * @param measureSpec the measure specification to extract the size from 16670 * @return the size in pixels defined in the supplied measure specification 16671 */ 16672 public static int getSize(int measureSpec) { 16673 return (measureSpec & ~MODE_MASK); 16674 } 16675 16676 /** 16677 * Returns a String representation of the specified measure 16678 * specification. 16679 * 16680 * @param measureSpec the measure specification to convert to a String 16681 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16682 */ 16683 public static String toString(int measureSpec) { 16684 int mode = getMode(measureSpec); 16685 int size = getSize(measureSpec); 16686 16687 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16688 16689 if (mode == UNSPECIFIED) 16690 sb.append("UNSPECIFIED "); 16691 else if (mode == EXACTLY) 16692 sb.append("EXACTLY "); 16693 else if (mode == AT_MOST) 16694 sb.append("AT_MOST "); 16695 else 16696 sb.append(mode).append(" "); 16697 16698 sb.append(size); 16699 return sb.toString(); 16700 } 16701 } 16702 16703 class CheckForLongPress implements Runnable { 16704 16705 private int mOriginalWindowAttachCount; 16706 16707 public void run() { 16708 if (isPressed() && (mParent != null) 16709 && mOriginalWindowAttachCount == mWindowAttachCount) { 16710 if (performLongClick()) { 16711 mHasPerformedLongPress = true; 16712 } 16713 } 16714 } 16715 16716 public void rememberWindowAttachCount() { 16717 mOriginalWindowAttachCount = mWindowAttachCount; 16718 } 16719 } 16720 16721 private final class CheckForTap implements Runnable { 16722 public void run() { 16723 mPrivateFlags &= ~PREPRESSED; 16724 setPressed(true); 16725 checkForLongClick(ViewConfiguration.getTapTimeout()); 16726 } 16727 } 16728 16729 private final class PerformClick implements Runnable { 16730 public void run() { 16731 performClick(); 16732 } 16733 } 16734 16735 /** @hide */ 16736 public void hackTurnOffWindowResizeAnim(boolean off) { 16737 mAttachInfo.mTurnOffWindowResizeAnim = off; 16738 } 16739 16740 /** 16741 * This method returns a ViewPropertyAnimator object, which can be used to animate 16742 * specific properties on this View. 16743 * 16744 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16745 */ 16746 public ViewPropertyAnimator animate() { 16747 if (mAnimator == null) { 16748 mAnimator = new ViewPropertyAnimator(this); 16749 } 16750 return mAnimator; 16751 } 16752 16753 /** 16754 * Interface definition for a callback to be invoked when a key event is 16755 * dispatched to this view. The callback will be invoked before the key 16756 * event is given to the view. 16757 */ 16758 public interface OnKeyListener { 16759 /** 16760 * Called when a key is dispatched to a view. This allows listeners to 16761 * get a chance to respond before the target view. 16762 * 16763 * @param v The view the key has been dispatched to. 16764 * @param keyCode The code for the physical key that was pressed 16765 * @param event The KeyEvent object containing full information about 16766 * the event. 16767 * @return True if the listener has consumed the event, false otherwise. 16768 */ 16769 boolean onKey(View v, int keyCode, KeyEvent event); 16770 } 16771 16772 /** 16773 * Interface definition for a callback to be invoked when a touch event is 16774 * dispatched to this view. The callback will be invoked before the touch 16775 * event is given to the view. 16776 */ 16777 public interface OnTouchListener { 16778 /** 16779 * Called when a touch event is dispatched to a view. This allows listeners to 16780 * get a chance to respond before the target view. 16781 * 16782 * @param v The view the touch event has been dispatched to. 16783 * @param event The MotionEvent object containing full information about 16784 * the event. 16785 * @return True if the listener has consumed the event, false otherwise. 16786 */ 16787 boolean onTouch(View v, MotionEvent event); 16788 } 16789 16790 /** 16791 * Interface definition for a callback to be invoked when a hover event is 16792 * dispatched to this view. The callback will be invoked before the hover 16793 * event is given to the view. 16794 */ 16795 public interface OnHoverListener { 16796 /** 16797 * Called when a hover event is dispatched to a view. This allows listeners to 16798 * get a chance to respond before the target view. 16799 * 16800 * @param v The view the hover event has been dispatched to. 16801 * @param event The MotionEvent object containing full information about 16802 * the event. 16803 * @return True if the listener has consumed the event, false otherwise. 16804 */ 16805 boolean onHover(View v, MotionEvent event); 16806 } 16807 16808 /** 16809 * Interface definition for a callback to be invoked when a generic motion event is 16810 * dispatched to this view. The callback will be invoked before the generic motion 16811 * event is given to the view. 16812 */ 16813 public interface OnGenericMotionListener { 16814 /** 16815 * Called when a generic motion event is dispatched to a view. This allows listeners to 16816 * get a chance to respond before the target view. 16817 * 16818 * @param v The view the generic motion event has been dispatched to. 16819 * @param event The MotionEvent object containing full information about 16820 * the event. 16821 * @return True if the listener has consumed the event, false otherwise. 16822 */ 16823 boolean onGenericMotion(View v, MotionEvent event); 16824 } 16825 16826 /** 16827 * Interface definition for a callback to be invoked when a view has been clicked and held. 16828 */ 16829 public interface OnLongClickListener { 16830 /** 16831 * Called when a view has been clicked and held. 16832 * 16833 * @param v The view that was clicked and held. 16834 * 16835 * @return true if the callback consumed the long click, false otherwise. 16836 */ 16837 boolean onLongClick(View v); 16838 } 16839 16840 /** 16841 * Interface definition for a callback to be invoked when a drag is being dispatched 16842 * to this view. The callback will be invoked before the hosting view's own 16843 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16844 * onDrag(event) behavior, it should return 'false' from this callback. 16845 * 16846 * <div class="special reference"> 16847 * <h3>Developer Guides</h3> 16848 * <p>For a guide to implementing drag and drop features, read the 16849 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16850 * </div> 16851 */ 16852 public interface OnDragListener { 16853 /** 16854 * Called when a drag event is dispatched to a view. This allows listeners 16855 * to get a chance to override base View behavior. 16856 * 16857 * @param v The View that received the drag event. 16858 * @param event The {@link android.view.DragEvent} object for the drag event. 16859 * @return {@code true} if the drag event was handled successfully, or {@code false} 16860 * if the drag event was not handled. Note that {@code false} will trigger the View 16861 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16862 */ 16863 boolean onDrag(View v, DragEvent event); 16864 } 16865 16866 /** 16867 * Interface definition for a callback to be invoked when the focus state of 16868 * a view changed. 16869 */ 16870 public interface OnFocusChangeListener { 16871 /** 16872 * Called when the focus state of a view has changed. 16873 * 16874 * @param v The view whose state has changed. 16875 * @param hasFocus The new focus state of v. 16876 */ 16877 void onFocusChange(View v, boolean hasFocus); 16878 } 16879 16880 /** 16881 * Interface definition for a callback to be invoked when a view is clicked. 16882 */ 16883 public interface OnClickListener { 16884 /** 16885 * Called when a view has been clicked. 16886 * 16887 * @param v The view that was clicked. 16888 */ 16889 void onClick(View v); 16890 } 16891 16892 /** 16893 * Interface definition for a callback to be invoked when the context menu 16894 * for this view is being built. 16895 */ 16896 public interface OnCreateContextMenuListener { 16897 /** 16898 * Called when the context menu for this view is being built. It is not 16899 * safe to hold onto the menu after this method returns. 16900 * 16901 * @param menu The context menu that is being built 16902 * @param v The view for which the context menu is being built 16903 * @param menuInfo Extra information about the item for which the 16904 * context menu should be shown. This information will vary 16905 * depending on the class of v. 16906 */ 16907 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16908 } 16909 16910 /** 16911 * Interface definition for a callback to be invoked when the status bar changes 16912 * visibility. This reports <strong>global</strong> changes to the system UI 16913 * state, not what the application is requesting. 16914 * 16915 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16916 */ 16917 public interface OnSystemUiVisibilityChangeListener { 16918 /** 16919 * Called when the status bar changes visibility because of a call to 16920 * {@link View#setSystemUiVisibility(int)}. 16921 * 16922 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16923 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 16924 * This tells you the <strong>global</strong> state of these UI visibility 16925 * flags, not what your app is currently applying. 16926 */ 16927 public void onSystemUiVisibilityChange(int visibility); 16928 } 16929 16930 /** 16931 * Interface definition for a callback to be invoked when this view is attached 16932 * or detached from its window. 16933 */ 16934 public interface OnAttachStateChangeListener { 16935 /** 16936 * Called when the view is attached to a window. 16937 * @param v The view that was attached 16938 */ 16939 public void onViewAttachedToWindow(View v); 16940 /** 16941 * Called when the view is detached from a window. 16942 * @param v The view that was detached 16943 */ 16944 public void onViewDetachedFromWindow(View v); 16945 } 16946 16947 private final class UnsetPressedState implements Runnable { 16948 public void run() { 16949 setPressed(false); 16950 } 16951 } 16952 16953 /** 16954 * Base class for derived classes that want to save and restore their own 16955 * state in {@link android.view.View#onSaveInstanceState()}. 16956 */ 16957 public static class BaseSavedState extends AbsSavedState { 16958 /** 16959 * Constructor used when reading from a parcel. Reads the state of the superclass. 16960 * 16961 * @param source 16962 */ 16963 public BaseSavedState(Parcel source) { 16964 super(source); 16965 } 16966 16967 /** 16968 * Constructor called by derived classes when creating their SavedState objects 16969 * 16970 * @param superState The state of the superclass of this view 16971 */ 16972 public BaseSavedState(Parcelable superState) { 16973 super(superState); 16974 } 16975 16976 public static final Parcelable.Creator<BaseSavedState> CREATOR = 16977 new Parcelable.Creator<BaseSavedState>() { 16978 public BaseSavedState createFromParcel(Parcel in) { 16979 return new BaseSavedState(in); 16980 } 16981 16982 public BaseSavedState[] newArray(int size) { 16983 return new BaseSavedState[size]; 16984 } 16985 }; 16986 } 16987 16988 /** 16989 * A set of information given to a view when it is attached to its parent 16990 * window. 16991 */ 16992 static class AttachInfo { 16993 interface Callbacks { 16994 void playSoundEffect(int effectId); 16995 boolean performHapticFeedback(int effectId, boolean always); 16996 } 16997 16998 /** 16999 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17000 * to a Handler. This class contains the target (View) to invalidate and 17001 * the coordinates of the dirty rectangle. 17002 * 17003 * For performance purposes, this class also implements a pool of up to 17004 * POOL_LIMIT objects that get reused. This reduces memory allocations 17005 * whenever possible. 17006 */ 17007 static class InvalidateInfo implements Poolable<InvalidateInfo> { 17008 private static final int POOL_LIMIT = 10; 17009 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 17010 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 17011 public InvalidateInfo newInstance() { 17012 return new InvalidateInfo(); 17013 } 17014 17015 public void onAcquired(InvalidateInfo element) { 17016 } 17017 17018 public void onReleased(InvalidateInfo element) { 17019 element.target = null; 17020 } 17021 }, POOL_LIMIT) 17022 ); 17023 17024 private InvalidateInfo mNext; 17025 private boolean mIsPooled; 17026 17027 View target; 17028 17029 int left; 17030 int top; 17031 int right; 17032 int bottom; 17033 17034 public void setNextPoolable(InvalidateInfo element) { 17035 mNext = element; 17036 } 17037 17038 public InvalidateInfo getNextPoolable() { 17039 return mNext; 17040 } 17041 17042 static InvalidateInfo acquire() { 17043 return sPool.acquire(); 17044 } 17045 17046 void release() { 17047 sPool.release(this); 17048 } 17049 17050 public boolean isPooled() { 17051 return mIsPooled; 17052 } 17053 17054 public void setPooled(boolean isPooled) { 17055 mIsPooled = isPooled; 17056 } 17057 } 17058 17059 final IWindowSession mSession; 17060 17061 final IWindow mWindow; 17062 17063 final IBinder mWindowToken; 17064 17065 final Callbacks mRootCallbacks; 17066 17067 HardwareCanvas mHardwareCanvas; 17068 17069 /** 17070 * The top view of the hierarchy. 17071 */ 17072 View mRootView; 17073 17074 IBinder mPanelParentWindowToken; 17075 Surface mSurface; 17076 17077 boolean mHardwareAccelerated; 17078 boolean mHardwareAccelerationRequested; 17079 HardwareRenderer mHardwareRenderer; 17080 17081 boolean mScreenOn; 17082 17083 /** 17084 * Scale factor used by the compatibility mode 17085 */ 17086 float mApplicationScale; 17087 17088 /** 17089 * Indicates whether the application is in compatibility mode 17090 */ 17091 boolean mScalingRequired; 17092 17093 /** 17094 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17095 */ 17096 boolean mTurnOffWindowResizeAnim; 17097 17098 /** 17099 * Left position of this view's window 17100 */ 17101 int mWindowLeft; 17102 17103 /** 17104 * Top position of this view's window 17105 */ 17106 int mWindowTop; 17107 17108 /** 17109 * Indicates whether views need to use 32-bit drawing caches 17110 */ 17111 boolean mUse32BitDrawingCache; 17112 17113 /** 17114 * For windows that are full-screen but using insets to layout inside 17115 * of the screen decorations, these are the current insets for the 17116 * content of the window. 17117 */ 17118 final Rect mContentInsets = new Rect(); 17119 17120 /** 17121 * For windows that are full-screen but using insets to layout inside 17122 * of the screen decorations, these are the current insets for the 17123 * actual visible parts of the window. 17124 */ 17125 final Rect mVisibleInsets = new Rect(); 17126 17127 /** 17128 * The internal insets given by this window. This value is 17129 * supplied by the client (through 17130 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17131 * be given to the window manager when changed to be used in laying 17132 * out windows behind it. 17133 */ 17134 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17135 = new ViewTreeObserver.InternalInsetsInfo(); 17136 17137 /** 17138 * All views in the window's hierarchy that serve as scroll containers, 17139 * used to determine if the window can be resized or must be panned 17140 * to adjust for a soft input area. 17141 */ 17142 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17143 17144 final KeyEvent.DispatcherState mKeyDispatchState 17145 = new KeyEvent.DispatcherState(); 17146 17147 /** 17148 * Indicates whether the view's window currently has the focus. 17149 */ 17150 boolean mHasWindowFocus; 17151 17152 /** 17153 * The current visibility of the window. 17154 */ 17155 int mWindowVisibility; 17156 17157 /** 17158 * Indicates the time at which drawing started to occur. 17159 */ 17160 long mDrawingTime; 17161 17162 /** 17163 * Indicates whether or not ignoring the DIRTY_MASK flags. 17164 */ 17165 boolean mIgnoreDirtyState; 17166 17167 /** 17168 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17169 * to avoid clearing that flag prematurely. 17170 */ 17171 boolean mSetIgnoreDirtyState = false; 17172 17173 /** 17174 * Indicates whether the view's window is currently in touch mode. 17175 */ 17176 boolean mInTouchMode; 17177 17178 /** 17179 * Indicates that ViewAncestor should trigger a global layout change 17180 * the next time it performs a traversal 17181 */ 17182 boolean mRecomputeGlobalAttributes; 17183 17184 /** 17185 * Always report new attributes at next traversal. 17186 */ 17187 boolean mForceReportNewAttributes; 17188 17189 /** 17190 * Set during a traveral if any views want to keep the screen on. 17191 */ 17192 boolean mKeepScreenOn; 17193 17194 /** 17195 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17196 */ 17197 int mSystemUiVisibility; 17198 17199 /** 17200 * Hack to force certain system UI visibility flags to be cleared. 17201 */ 17202 int mDisabledSystemUiVisibility; 17203 17204 /** 17205 * Last global system UI visibility reported by the window manager. 17206 */ 17207 int mGlobalSystemUiVisibility; 17208 17209 /** 17210 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17211 * attached. 17212 */ 17213 boolean mHasSystemUiListeners; 17214 17215 /** 17216 * Set if the visibility of any views has changed. 17217 */ 17218 boolean mViewVisibilityChanged; 17219 17220 /** 17221 * Set to true if a view has been scrolled. 17222 */ 17223 boolean mViewScrollChanged; 17224 17225 /** 17226 * Global to the view hierarchy used as a temporary for dealing with 17227 * x/y points in the transparent region computations. 17228 */ 17229 final int[] mTransparentLocation = new int[2]; 17230 17231 /** 17232 * Global to the view hierarchy used as a temporary for dealing with 17233 * x/y points in the ViewGroup.invalidateChild implementation. 17234 */ 17235 final int[] mInvalidateChildLocation = new int[2]; 17236 17237 17238 /** 17239 * Global to the view hierarchy used as a temporary for dealing with 17240 * x/y location when view is transformed. 17241 */ 17242 final float[] mTmpTransformLocation = new float[2]; 17243 17244 /** 17245 * The view tree observer used to dispatch global events like 17246 * layout, pre-draw, touch mode change, etc. 17247 */ 17248 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17249 17250 /** 17251 * A Canvas used by the view hierarchy to perform bitmap caching. 17252 */ 17253 Canvas mCanvas; 17254 17255 /** 17256 * The view root impl. 17257 */ 17258 final ViewRootImpl mViewRootImpl; 17259 17260 /** 17261 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17262 * handler can be used to pump events in the UI events queue. 17263 */ 17264 final Handler mHandler; 17265 17266 /** 17267 * Temporary for use in computing invalidate rectangles while 17268 * calling up the hierarchy. 17269 */ 17270 final Rect mTmpInvalRect = new Rect(); 17271 17272 /** 17273 * Temporary for use in computing hit areas with transformed views 17274 */ 17275 final RectF mTmpTransformRect = new RectF(); 17276 17277 /** 17278 * Temporary list for use in collecting focusable descendents of a view. 17279 */ 17280 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17281 17282 /** 17283 * The id of the window for accessibility purposes. 17284 */ 17285 int mAccessibilityWindowId = View.NO_ID; 17286 17287 /** 17288 * Whether to ingore not exposed for accessibility Views when 17289 * reporting the view tree to accessibility services. 17290 */ 17291 boolean mIncludeNotImportantViews; 17292 17293 /** 17294 * The drawable for highlighting accessibility focus. 17295 */ 17296 Drawable mAccessibilityFocusDrawable; 17297 17298 /** 17299 * Show where the margins, bounds and layout bounds are for each view. 17300 */ 17301 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17302 17303 /** 17304 * Point used to compute visible regions. 17305 */ 17306 final Point mPoint = new Point(); 17307 17308 /** 17309 * Creates a new set of attachment information with the specified 17310 * events handler and thread. 17311 * 17312 * @param handler the events handler the view must use 17313 */ 17314 AttachInfo(IWindowSession session, IWindow window, 17315 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17316 mSession = session; 17317 mWindow = window; 17318 mWindowToken = window.asBinder(); 17319 mViewRootImpl = viewRootImpl; 17320 mHandler = handler; 17321 mRootCallbacks = effectPlayer; 17322 } 17323 } 17324 17325 /** 17326 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17327 * is supported. This avoids keeping too many unused fields in most 17328 * instances of View.</p> 17329 */ 17330 private static class ScrollabilityCache implements Runnable { 17331 17332 /** 17333 * Scrollbars are not visible 17334 */ 17335 public static final int OFF = 0; 17336 17337 /** 17338 * Scrollbars are visible 17339 */ 17340 public static final int ON = 1; 17341 17342 /** 17343 * Scrollbars are fading away 17344 */ 17345 public static final int FADING = 2; 17346 17347 public boolean fadeScrollBars; 17348 17349 public int fadingEdgeLength; 17350 public int scrollBarDefaultDelayBeforeFade; 17351 public int scrollBarFadeDuration; 17352 17353 public int scrollBarSize; 17354 public ScrollBarDrawable scrollBar; 17355 public float[] interpolatorValues; 17356 public View host; 17357 17358 public final Paint paint; 17359 public final Matrix matrix; 17360 public Shader shader; 17361 17362 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17363 17364 private static final float[] OPAQUE = { 255 }; 17365 private static final float[] TRANSPARENT = { 0.0f }; 17366 17367 /** 17368 * When fading should start. This time moves into the future every time 17369 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17370 */ 17371 public long fadeStartTime; 17372 17373 17374 /** 17375 * The current state of the scrollbars: ON, OFF, or FADING 17376 */ 17377 public int state = OFF; 17378 17379 private int mLastColor; 17380 17381 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17382 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17383 scrollBarSize = configuration.getScaledScrollBarSize(); 17384 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17385 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17386 17387 paint = new Paint(); 17388 matrix = new Matrix(); 17389 // use use a height of 1, and then wack the matrix each time we 17390 // actually use it. 17391 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17392 17393 paint.setShader(shader); 17394 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17395 this.host = host; 17396 } 17397 17398 public void setFadeColor(int color) { 17399 if (color != 0 && color != mLastColor) { 17400 mLastColor = color; 17401 color |= 0xFF000000; 17402 17403 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17404 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17405 17406 paint.setShader(shader); 17407 // Restore the default transfer mode (src_over) 17408 paint.setXfermode(null); 17409 } 17410 } 17411 17412 public void run() { 17413 long now = AnimationUtils.currentAnimationTimeMillis(); 17414 if (now >= fadeStartTime) { 17415 17416 // the animation fades the scrollbars out by changing 17417 // the opacity (alpha) from fully opaque to fully 17418 // transparent 17419 int nextFrame = (int) now; 17420 int framesCount = 0; 17421 17422 Interpolator interpolator = scrollBarInterpolator; 17423 17424 // Start opaque 17425 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17426 17427 // End transparent 17428 nextFrame += scrollBarFadeDuration; 17429 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17430 17431 state = FADING; 17432 17433 // Kick off the fade animation 17434 host.invalidate(true); 17435 } 17436 } 17437 } 17438 17439 /** 17440 * Resuable callback for sending 17441 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17442 */ 17443 private class SendViewScrolledAccessibilityEvent implements Runnable { 17444 public volatile boolean mIsPending; 17445 17446 public void run() { 17447 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17448 mIsPending = false; 17449 } 17450 } 17451 17452 /** 17453 * <p> 17454 * This class represents a delegate that can be registered in a {@link View} 17455 * to enhance accessibility support via composition rather via inheritance. 17456 * It is specifically targeted to widget developers that extend basic View 17457 * classes i.e. classes in package android.view, that would like their 17458 * applications to be backwards compatible. 17459 * </p> 17460 * <div class="special reference"> 17461 * <h3>Developer Guides</h3> 17462 * <p>For more information about making applications accessible, read the 17463 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17464 * developer guide.</p> 17465 * </div> 17466 * <p> 17467 * A scenario in which a developer would like to use an accessibility delegate 17468 * is overriding a method introduced in a later API version then the minimal API 17469 * version supported by the application. For example, the method 17470 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17471 * in API version 4 when the accessibility APIs were first introduced. If a 17472 * developer would like his application to run on API version 4 devices (assuming 17473 * all other APIs used by the application are version 4 or lower) and take advantage 17474 * of this method, instead of overriding the method which would break the application's 17475 * backwards compatibility, he can override the corresponding method in this 17476 * delegate and register the delegate in the target View if the API version of 17477 * the system is high enough i.e. the API version is same or higher to the API 17478 * version that introduced 17479 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17480 * </p> 17481 * <p> 17482 * Here is an example implementation: 17483 * </p> 17484 * <code><pre><p> 17485 * if (Build.VERSION.SDK_INT >= 14) { 17486 * // If the API version is equal of higher than the version in 17487 * // which onInitializeAccessibilityNodeInfo was introduced we 17488 * // register a delegate with a customized implementation. 17489 * View view = findViewById(R.id.view_id); 17490 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17491 * public void onInitializeAccessibilityNodeInfo(View host, 17492 * AccessibilityNodeInfo info) { 17493 * // Let the default implementation populate the info. 17494 * super.onInitializeAccessibilityNodeInfo(host, info); 17495 * // Set some other information. 17496 * info.setEnabled(host.isEnabled()); 17497 * } 17498 * }); 17499 * } 17500 * </code></pre></p> 17501 * <p> 17502 * This delegate contains methods that correspond to the accessibility methods 17503 * in View. If a delegate has been specified the implementation in View hands 17504 * off handling to the corresponding method in this delegate. The default 17505 * implementation the delegate methods behaves exactly as the corresponding 17506 * method in View for the case of no accessibility delegate been set. Hence, 17507 * to customize the behavior of a View method, clients can override only the 17508 * corresponding delegate method without altering the behavior of the rest 17509 * accessibility related methods of the host view. 17510 * </p> 17511 */ 17512 public static class AccessibilityDelegate { 17513 17514 /** 17515 * Sends an accessibility event of the given type. If accessibility is not 17516 * enabled this method has no effect. 17517 * <p> 17518 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17519 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17520 * been set. 17521 * </p> 17522 * 17523 * @param host The View hosting the delegate. 17524 * @param eventType The type of the event to send. 17525 * 17526 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17527 */ 17528 public void sendAccessibilityEvent(View host, int eventType) { 17529 host.sendAccessibilityEventInternal(eventType); 17530 } 17531 17532 /** 17533 * Performs the specified accessibility action on the view. For 17534 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 17535 * <p> 17536 * The default implementation behaves as 17537 * {@link View#performAccessibilityAction(int, Bundle) 17538 * View#performAccessibilityAction(int, Bundle)} for the case of 17539 * no accessibility delegate been set. 17540 * </p> 17541 * 17542 * @param action The action to perform. 17543 * @return Whether the action was performed. 17544 * 17545 * @see View#performAccessibilityAction(int, Bundle) 17546 * View#performAccessibilityAction(int, Bundle) 17547 */ 17548 public boolean performAccessibilityAction(View host, int action, Bundle args) { 17549 return host.performAccessibilityActionInternal(action, args); 17550 } 17551 17552 /** 17553 * Sends an accessibility event. This method behaves exactly as 17554 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17555 * empty {@link AccessibilityEvent} and does not perform a check whether 17556 * accessibility is enabled. 17557 * <p> 17558 * The default implementation behaves as 17559 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17560 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17561 * the case of no accessibility delegate been set. 17562 * </p> 17563 * 17564 * @param host The View hosting the delegate. 17565 * @param event The event to send. 17566 * 17567 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17568 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17569 */ 17570 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17571 host.sendAccessibilityEventUncheckedInternal(event); 17572 } 17573 17574 /** 17575 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17576 * to its children for adding their text content to the event. 17577 * <p> 17578 * The default implementation behaves as 17579 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17580 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17581 * the case of no accessibility delegate been set. 17582 * </p> 17583 * 17584 * @param host The View hosting the delegate. 17585 * @param event The event. 17586 * @return True if the event population was completed. 17587 * 17588 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17589 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17590 */ 17591 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17592 return host.dispatchPopulateAccessibilityEventInternal(event); 17593 } 17594 17595 /** 17596 * Gives a chance to the host View to populate the accessibility event with its 17597 * text content. 17598 * <p> 17599 * The default implementation behaves as 17600 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17601 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17602 * the case of no accessibility delegate been set. 17603 * </p> 17604 * 17605 * @param host The View hosting the delegate. 17606 * @param event The accessibility event which to populate. 17607 * 17608 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17609 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17610 */ 17611 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17612 host.onPopulateAccessibilityEventInternal(event); 17613 } 17614 17615 /** 17616 * Initializes an {@link AccessibilityEvent} with information about the 17617 * the host View which is the event source. 17618 * <p> 17619 * The default implementation behaves as 17620 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17621 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17622 * the case of no accessibility delegate been set. 17623 * </p> 17624 * 17625 * @param host The View hosting the delegate. 17626 * @param event The event to initialize. 17627 * 17628 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17629 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17630 */ 17631 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17632 host.onInitializeAccessibilityEventInternal(event); 17633 } 17634 17635 /** 17636 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17637 * <p> 17638 * The default implementation behaves as 17639 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17640 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17641 * the case of no accessibility delegate been set. 17642 * </p> 17643 * 17644 * @param host The View hosting the delegate. 17645 * @param info The instance to initialize. 17646 * 17647 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17648 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17649 */ 17650 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17651 host.onInitializeAccessibilityNodeInfoInternal(info); 17652 } 17653 17654 /** 17655 * Called when a child of the host View has requested sending an 17656 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17657 * to augment the event. 17658 * <p> 17659 * The default implementation behaves as 17660 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17661 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17662 * the case of no accessibility delegate been set. 17663 * </p> 17664 * 17665 * @param host The View hosting the delegate. 17666 * @param child The child which requests sending the event. 17667 * @param event The event to be sent. 17668 * @return True if the event should be sent 17669 * 17670 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17671 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17672 */ 17673 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17674 AccessibilityEvent event) { 17675 return host.onRequestSendAccessibilityEventInternal(child, event); 17676 } 17677 17678 /** 17679 * Gets the provider for managing a virtual view hierarchy rooted at this View 17680 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17681 * that explore the window content. 17682 * <p> 17683 * The default implementation behaves as 17684 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17685 * the case of no accessibility delegate been set. 17686 * </p> 17687 * 17688 * @return The provider. 17689 * 17690 * @see AccessibilityNodeProvider 17691 */ 17692 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17693 return null; 17694 } 17695 } 17696} 17697